Bow with Reduced Draw Force

Abstract

A traditional bow, includes a riser with an upper and lower end. A first limb member provided at the upper end of the riser, the first limb member includes a first and second body with co-planar surfaces and proximal and distal ends. the proximal ends of the first limb member are coupled to the upper end of the riser. A first tip couples the distal ends of the first and second bodies and includes a first notch extending radially from the first tip. A first longitudinal slot extends between the first and second bodies at least partially between the upper end of the riser and the first tip. A second limb member provided at the lower end of the riser, the second limb member includes a third and fourth body with co-planar surfaces and proximal and a distal ends, the proximal ends of the second limb member are coupled to the lower end of the riser. A second tip couples the distal ends of the third and fourth bodies and includes a second notch extending radially from the second tip. A second longitudinal slot extends between the third and fourth bodies at least partially between the lower end of the riser and the second tip. A bowstring is operatively coupled between the first limb notch and second limb notch and passes through the first and second longitudinal slots. The first and second limb notches pass through three or more states as the bowstring is drawn from an initial resting position to a maximum draw length. The first and second notches being furthest apart at a first state. closest together in an intermediate state, and at a position between the furthest and closest position in a final state. A peak draw force occurs at an intermediate draw length and a reduced draw force occurs at a maximum draw length.

Claims

1. A traditional bow, comprising: a riser with an upper and lower end; a first limb member including; a first and second body each with a distal end and a proximal end wherein said proximal end of the first body and said proximal end of the second body are coupled to said upper end of the riser; wherein said first and second bodies have co-planer surfaces; and a first tip that couples said distal end of the first body and said distal end of the second body; a first notch radially extending from said first tip; a first longitudinal slot between said first and second bodies extending at least partially between the upper end of the riser and the first tip; and a second limb member including: a third and fourth body each with a distal end and a proximal end where said proximal end of the third body and said proximal end of the fourth body is coupled to said lower end of the riser; wherein said third and fourth bodies have co-planer surfaces; and a second tip that couples said distal end of the third body and said distal end of the fourth body; a second notch radially extending from said second tip; a second longitudinal slot between said third and fourth bodies extending at least partially between the lower end of the riser and the second tip; a bowstring operatively coupled to said first notch and said second notch and passes through said first longitudinal slot and said second longitudinal slot; and whereas said first and second notches pass through three or more states as said bowstring is drawn from an initial resting position to a maximum draw length position; and whereas the first and second notches are furthest apart at a first state, closest to each other at an intermediate state, and at a position between said furthest position and said closest position in a final state.

2. The bow of claim 1, wherein a straight line distance D is defined between a point where said bowstring is coupled to said first and second notches; and said straight line distance D, during the draw of said bowstring from the initial state to the final state, is less than the straight line distance D in the initial state.

3. The bow of claim 1, wherein the draw of said bowstring defines an inside angle near the center of the bowstring; and said inside angle is 180 degrees at the initial state and is less than 180 degrees during the draw from said initial resting position to said maximum draw length position.

4. The bow of claim 1, wherein the first, second, third and fourth bodies comprise three or more body segments.

5. The bow of claim 4, wherein the body segment closest to the riser is thicker and wider in construction than the last body segment closest to the first and second notches.

6. The bow of claim 1, wherein the proximal end of the first, second, third and fourth bodies are less flexible than the distal end of said first, second, third and fourth bodies.

7. The bow of claim 1, wherein the riser is operatively coupled to one or more extension members that project proximally relative to said riser.

8. The bow of claim 7, wherein the extensions define a pocket and are operatively coupled to one or more attachment mechanisms for securing the first and second limb members.

9. The bow of claim 1, where a peak draw force occurs at an intermediate state and a reduced draw force occurs at a final state.

10. A traditional bow, comprising: a riser with a upper and lower end; a first limb member including; a first and second body with a distal end and a proximal end; wherein said proximal end of the first body and said proximal end of the second body are coupled to said upper end of the riser; wherein said first and second bodies have co-planer surfaces; and a first tip that couples said distal end of the first body and said distal end of the second body; a first notch radially extending from said first tip; a first longitudinal slot between said first and second bodies extending at least partially between the upper end of the riser and the first tip; and a second limb member including: a third and fourth body each with a distal end and a proximal end where said proximal end of the third body and said proximal end of the fourth body is coupled to said lower end of the riser; wherein said third and fourth bodies have co-planer surfaces; and a second tip that couples said distal end of the third body and said distal end of the fourth body; a second notch radially extending from said second tip; a second longitudinal slot between said third and fourth bodies extending at least partially between the riser and the second tip; and a bowstring operatively coupled to said first notch and said second notch and passes through said first longitudinal slot and said second longitudinal slot; and one or more stiffening elements surrounding at least a portion of the length of said bowstring that passes through said first and second longitudinal slots; and whereas said first and second notches pass through three or more states as said bowstring is drawn from an initial resting position to a maximum draw length position; and whereas the first and second notches are furthest apart at a first state, closest to each other at an intermediate state, and at a position between said furthest position and said closest position in a final state.

11. The bow of claim 10, wherein a straight line distance D is defined between a point where said bowstring is coupled to said first and second notches; and said straight line distance D, during the draw of said bowstring from the initial state to the final state, is less than the straight line distance D in the initial state.

12. The bow of claim 10 wherein the draw of said bowstring defines an inside angle near the center of the bowstring; and said inside angle is 180 degrees at the initial state and is less than 180 degrees during the draw from said initial resting position to said maximum draw length position.

13. The bow of claim 10, wherein the first, second, third and fourth bodies comprise three or more body segments.

14. The bow of claim 13, wherein the body segment closest to the riser is thicker and wider in construction than the last body segment closest to the first and second notches.

15. The bow of claim 10, wherein the proximal end of the first, second, third and fourth bodies are less flexible than the distal end of said first, second, third and fourth bodies.

16. The bow of claim 10, wherein the riser is operatively coupled to one or more extension members that project proximally relative to said riser.

17. The bow of claim 16, wherein the extensions define a pocket and are operatively coupled to one or more attachment mechanisms for securing the first and second limb members.

18. The bow of claim 10, where a peak draw force occurs at an intermediate state and a reduced draw force occurs at a final state.

19. A traditional bow, comprising: a riser with a upper and lower end; a first limb member including; a first and second body with a distal end and a proximal end; wherein said proximal end of the first body and said proximal end of the second body are coupled to said upper end of the riser; wherein said first and second bodies are splayed and have non-planer surfaces; and a first tip that couples said distal end of the first body and said distal end of the second body; a first notch radially extending from said first tip; a first longitudinal slot between said first and second bodies extending at least partially between the upper end of the riser and the first tip; and a second limb member including: a third and fourth body with a distal end and a proximal end; wherein said proximal end of the third body and said proximal end of the fourth body is coupled to said lower end of the riser; and wherein said third and fourth bodies are splayed and have non-planer surfaces; a second tip that couples said distal end of the third body and said distal end of the fourth body; a second notch radially extending from said second tip; a second longitudinal slot between said third and fourth bodies extending at least partially between the riser and the second tip; and a bowstring operatively coupled to said first notch and said second notch and passes through said first longitudinal slot and said second longitudinal slot; and whereas said first and second notches pass through three or more states as said bowstring is drawn from an initial resting position to a maximum draw length position; and whereas the first and second notches are furthest apart at a first state, closest to each other at an intermediate state, and at a position between said furthest position and said closest position in a final state.

20. The bow of claim 19, wherein a straight line distance D is defined between a point where said bowstring is coupled to said first and second notches; and said straight line distance D, during the draw of said bowstring from the initial state to the final state, is less than the straight line distance D in the initial state.

21. The bow of claim 19, wherein the draw of said bowstring defines an inside angle near the center of the bowstring; and said inside angle is 180 degrees at the initial state and is less than 180 degrees during the draw from said initial resting position to said maximum draw length position.

22. The bow of claim 19, wherein the first, second, third and fourth bodies comprise three or more body segments.

23. The bow of claim 22, wherein the body segment closest to the riser is thicker and wider in construction than the last body segment closest to the first and second notches.

24. The bow of claim 19, wherein the proximal end of the first, second, third and fourth bodies are less flexible than the distal end of said first, second, third and fourth bodies.

25. The bow of claim 19, wherein the riser is operatively coupled to one or more extension members that project proximally relative to said riser.

26. The bow of claim 25, wherein the extensions define a pocket and are operatively coupled to one or more attachment mechanisms for securing the first and second limb members.

27. The bow of claim 19, where a peak draw force occurs at an intermediate state and a reduced draw force occurs at a final state.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0012] The following figures are included to illustrate certain aspects of the present disclosure, and should not be viewed as exclusive embodiments. The subject matter disclosed is capable of considerable modifications, alterations, combinations, and equivalents in form and function, without departing from the scope of this disclosure.

[0013] FIG. 1A is a lateral view of a traditional straight recurve bow design in a strung configuration.

[0014] FIG. 1B is a lateral view of a traditional deflex recurve bow design in a strung configuration.

[0015] FIG. 1C is a lateral view of a traditional reflex recurve bow design in a strung configuration.

[0016] FIG. 2 is a lateral view of an example bow that may incorporate some or all of the principles of the present disclosure.

[0017] FIG. 3 is an anterior view of the bow of FIG. 2, according to one or more embodiments.

[0018] FIGS. 4A and 4B are enlarged isometric lateral views of the upper and lower limb bodies, respectively, of the bow of FIGS. 2 and 3, according to one or more embodiments.

[0019] FIG. 5A is a lateral view of an example bow at full draw that may incorporate some or all of the principles of the present disclosure.

[0020] FIG. 5B is a magnified view of the hook section of upper limb of the bow of FIG. 5A, according to one or more embodiments.

[0021] FIG. 5C is a magnified view of the string of the bow of FIG. 5A, according to one or more embodiments.

[0022] FIG. 6 is a lateral isometric view of the bow of FIG. 5A, according to one or more embodiments.

[0023] FIG. 7 is a lateral view of an example bow that may incorporate some or all of the principles of the present disclosure.

[0024] FIG. 8 is a posterior view of the bow of FIG. 7, according to one or more embodiments.

[0025] FIG. 9 is an anterior view of an example bow that may incorporate some or all of the principles of the present disclosure.

[0026] FIG. 10 is a posterior isometric view of the bow of FIG. 9, according to one or more embodiments.

[0027] FIG. 11 is a lateral isometric view of an example bow that may incorporate some or all of the principles of the present disclosure.

[0028] FIG. 12 is a posterior view of the bow of FIG. 11, according to one or more embodiments.

[0029] FIGS. 13A and 13B are lateral views of an example bow in the unstrung and strung configuration, respectively, that may incorporate some or all of the principles of the present disclosure.

[0030] FIGS. 13C-13G are lateral views of the bow of FIGS. 13A and 13B in progressively drawn states, according to one or more embodiments.

[0031] FIG. 14 is an overlaid lateral view of the six curvature states of the upper limb member shown in FIGS. 13B-13G.

[0032] FIG. 15 is a graph depicting a force draw curve of a bow embodying one or all of the principles of the present disclosure.

[0033] FIG. 16 is a graph overlaying the force draw curve for various bow designs.

DETAILED DESCRIPTION

[0034] The present disclosure is related to archery bow, more particularly, to limb members, which may include a longitudinal slot that allows the bowstring to pass therethrough. The limb members coil and then uncoil as the user draws the bow from its initial brace height to an intermediate draw position where the peak draw force is experienced, to a maximum draw length where the draw force is lower than the peak force thus allowing the archer to comfortably hold the max draw length similar to that of a compound bow design.

[0035] Embodiments described herein disclose limb members including a longitudinal slot therethrough. The limb members may be a single body with a slot that extends either partially or entirely between the limb tip and the attachment portion to the bow's riser. Alternatively, the limb members may be composed of two separate bodies that are joined at the distal tip with a connecting member, the limb bodies forming a slot that extends either partially or entirely between the limb tip and the attachment portion to the bow's riser. The attachment portion to the bow's riser of the one or more limb bodies of the limb members may be laterally offset from the longitudinal plane. Likewise, the attachment portion to the bow's riser of the one or more limb bodies of the limb members may be rotationally offset from one another creating a limb bodies which are angled and non planer relative to each other.

[0036] A bowstring may be arranged within the longitudinal slot and has a first end operatively coupled to the distal tip of the upper limb member and a second end operatively coupled to the distal tip of the lower limb member. The bowstring may include one or more stiffening members that may extend at least partially between the first and second ends. The stiffening members may increase a stiffness of the bowstring and support the limb bodies against twisting.

[0037] FIG. 1A is an example of a straight recurve bow design 100. As illustrated, bow 100 includes a riser 102 that includes an integrated handle, an upper limb member with an upper straight proximal body portion 107 and lower straight body portion 108 that attach to riser 102. Upper and lower limb members also include a distal body portion 105 and 106 respectively that is recurved (curves away from the archer). Bowstring 101 is connected to the upper limber member at upper limb notch 103 and connected to the lower limb member at lower notch 104. Bowstring 101 contacts and lays over upper distal body portion 105 and lower distal body portion 106.

[0038] FIG. 1B is an example of a deflex recurve bow design 120. As illustrated, bow 120 includes a riser 122 that includes an integrated handle, an upper limb member with an upper proximal body portion 127 and lower body portion 128 that attach to riser 122. Proximal body portions 127 and 128 are curved towards the archer. Upper and lower limb member also include a distal body portion 125 and 126 respectively that is recurved (curves away from the archer). Bowstring 121 is connected to the upper limber member at upper limb notch 123 and connected to the lower limb member at lower notch 124. Bowstring 121 contacts and lays over upper distal body portion 125 and lower distal body portion 126.

[0039] FIG. 1C is an example of a reflex recurve bow design 140. As illustrated, bow 140 includes a riser 142 that includes an integrated handle, an upper limb member with an upper proximal body portion 147 and lower body portion 148 that attach to riser 142. Proximal body portions 147 and 148 are curved away from the archer. Upper and lower limb member also include a distal body portion 145 and 146 respectively that is recurved (curves away from the archer) at a tighter radius than the curve of proximal body portions 147 and 148. Bowstring 141 is connected to the upper limber member at upper limb notch 143 and connected to the lower limb member at lower limb notch 144. Bowstring 141 contacts and lays over upper distal body portion 145 and lower distal body portion 146.

[0040] FIG. 2 illustrates an example bow design 200 that may incorporate some or all of the principles of the present disclosure. Bow 200 has a riser 220 which may include an integrated handle piece 223. Riser 200 may also include an upper limb pocket 221 and lower limb pocket 222. Upper and lower limb pockets are shown in FIGS. 4A and 4B and described in greater detail below. At the proximal end of the upper and lower limb pocket 221 and 222 there may be one or more limb attachment mechanisms. Limb attachment mechanisms secure the limb member to riser 220 via the upper and lower proximal limb body segments 231 and 230. Limb attachment of upper and lower limb body segments 231 and 230 may be at an angle non-parallel with riser 220. Limb members may include different segments or region 240, 241, 250, and 251 along its length from the proximal end closest to riser 200 to the distal end terminating in an upper distal tip 271 and lower distal tip 270. Bow 200 further includes a bowstring 210 of a suitable material that attaches to upper limb notch 261 and lower limb notch 260. Unlike bow design in FIGS. 1A to 1C, bowstring 210 does not contact or lay over distal limb body segments 251 and 250. Upper and lower limb members of bow 200 have an elongated slot (not shown) that allows bowstring 210 to pass therethrough.

[0041] As illustrated, the bow 200 includes elongated limbs members that have one or more regions or segments along their length. The exemplary embodiment shown in FIG. 2 has an upper 231 and lower proximal body portion 230 adjacent to upper 241 and lower intermediate limb body segments 240. Upper 241 and lower intermediate limb body segments 240 are adjacent to upper 251 and lower distal limb body segments 250. The different regions or segments may be uniform in material and construction or alternatively may be made from two or more materials or components that are combined together using any suitable methods such as but not limited to mechanical fastening, heat welding, gluing, extrusion or injection molding. Likewise the limb body regions or segments may have uniform or varying mechanical properties between regions or along the length within the same region. For example, the upper and lower limb members may have different material thickness, shape, and/or stiffness on the proximal end nearest riser 220 than observed at the distal tips 270 and 271. The material thickness, shape, and/or stiffness may change as limb members' transition from the proximal end 230 and 231 to the distal tip 270 and 271 respectively. This change may be constant along the length of the limb member or the change may be variable for each of the one more regions/segments. While limb design of bows are typically symmetric, that is that the upper and lower limb members are identical in material, shape, and stiffness, it is contemplated within the scope of this disclosure that the upper and lower limb members could be asymmetric and have different properties.

[0042] The terms proximal and distal are defined herein relative to a bow design configured to be held by an archer at handle 223 on rise 220. The term proximal refers to the position of an element closer to the archers hand on the riser and the term distal refers to the position of an element closer to the limb tips 270 and 271 and thus further away from the handle 223. Moreover, the use of directional terms such as above, below, upper, lower, upward, downward, left, right, and the like are used in relation to the archer's hand holding the bow at handle 223. The upward or upper direction being toward the top of the bow above the archer's hand and the downward or lower direction being toward the bottom of the bow below the archers hand.

[0043] FIG. 3 illustrates an anterior view of bow 200. Riser 320 may include a shelf 324 and a sight window 325. In operation an archer would nock an arrow to bowstring 310 and rest the arrow on shelf 324 or on an arrow rest to keep the arrow stable during draw of the bow. While the bow is drawn the archer would use the sight window 325 to align their shot before releasing the arrow. On opposed ends of riser 320 there is a limb attachment mechanism for securing the upper and lower limb members to riser 320. In this exemplary embodiment the upper and lower limb members may each be made of two limb bodies each including a proximal limb body segments 331a, 331b, 330a, and 330b, an intermediate limb body segments 341a, 341b, 340a, and 340b, and distal limb body segments (as shown in FIG. 4). The proximal limb body segments 331a, 331b, 330a, and 330b are slightly spaced apart, creating a longitudinal slot between the upper and lower limb bodies. The proximal limb body segments 331a, 331b, 330a, and 330b are secured to riser 320 at the opposed limb attachment mechanisms. Proximal limb body segments 331a, 331b, 330a, and 330b may be wider and thicker in construction thus giving a stiffer character than intermediate limb body segments 341a, 341b, 340a, and 340b, and the distal limb body segments. As the limbs progress from proximal to distal the thickness and width of the limb bodies may be reduced and provide for more flexibility. Bowstring 310 is free to pass through the longitudinal slot and attach to the upper notch 361 and lower notch 360.

[0044] FIG. 4A is an isometric view of the upper limb member 400 and the attachment mechanism to riser 420. Riser 420 is connected to or may be uniformly made with extensions 421a and 421b. Extensions 421a and 421b are offset as to create a limb pocket 428. Limb pocket 428 may include one more limb attachment mechanisms 431a and 431b. Limb attachment mechanisms 431a and 431b may be separate components affixed to extensions 421a and 421b or integrally formed with extensions 421a and 421b. Limb attachment mechanisms 431a and 431b may comprise one or more mechanical fastener types such as but not limited to screws, nuts and bolts, rivets, swages other interference fittings. Furthermore limb attachment mechanisms 431a and 431b may be fastened in other ways to upper limb member 400 such as but not limited to injection molded, glued, welded, fused, or heat staked. Extensions 421a and 421b as well as limb attachment mechanisms 431a and 431b may be orthogonal to riser 420 or jointly or separately at an angle to riser 420. In the exemplary embodiment shown, extensions 421a and 421b are approximately orthogonal to riser 420 and attachment mechanisms 431a and 431b are angled such that they are neither orthogonal to extensions 421a and 421b nor parallel to riser 420.

[0045] Upper limb member 400 may have one or more limb bodies that each has one or more regions or segments. Upper proximal limb body segments' 434a and 434b may be offset from each other and operatively coupled to limb attachment mechanisms 431a and 431b. The offset of upper proximal limb body segments' 434a and 434b defines a longitudinal slot that extends from the proximal end of limb member 400 to upper distal tip 462. Although two limb bodies at an offset are shown in this and other embodiments, it is contemplated and would be obvious to one skilled in the art, that a single limb body with a longitudinal slot that does not extend all the way to the proximal end is within the scope of this disclosure. Upper proximal limb body segments' 434a and 434b have a thicker and wider profile thus a more rigid construction than the remainder of upper limb member 400. The thickness and width of upper limb member 400 reduces as the limb body transitions from the upper proximal limb body segments 434a and 434b to the upper intermediate limb body segments 441a and 441b. The profile and flexibility of upper limb member 400 from upper intermediate limb body segments 441a and 441b to upper distal limb body segments 451a and 451b may be uniform or in other embodiments it may vary but to a lesser amount than the transition from upper proximal limb body segments 434a and 434b to upper intermediate limb body segments 441a and 441b.

[0046] The curvature of upper limb member 400 is initiated by the attachment mechanisms 431a and 431b. Attachment mechanisms 431a and 431b in the exemplary embodiment shown in FIG. 4 are angled slightly towards the archer from an orthogonal position relative to extensions 421a and 421b. This angle projects the upper proximal limb body segments in an initial curvature towards the archer. The curvature is carried into upper intermediate limb body segments' 441a and 441b where the curvature may be further increased, that is the curvature follows a smaller bend radius. Likewise, the curvature is carried into upper distal limb body segments' 451a and 451b where the curvature may be further increased, decreased or in some embodiments remain constant with the curvature of the prior segment. In the exemplary embodiment shown in FIG. 4 the curvature is greatest in upper intermediate limb body segments 441a and 441b then reduces, that is follows a larger bed radius in the upper distal limb body segments 451a and 451b.

[0047] Upper distal limb body segments' 451a and 451b are joined at the distal end by an upper distal tip 462. Upper distal tip 462 may be integrally and uniformly made with the upper distal limb body segments' 451a and 451b. Yet, in other embodiments upper distal tip 462 may be a separate component that operatively couples and secures upper limb body segments 451a and 451b. Any suitable means for securing upper distal tip 462 to upper distal limb body segments 451a and 451b may be used such as but not limited to those previously mentioned for securing of the limb attachment mechanisms 431a and 431b to the upper proximal limb body segments 434a and 434b. Attached to upper distal tip 462 is upper notch 461. Upper notch 461 likewise may be a separate component or uniformly and integrally formed with the upper distal tip 462. Upper notch 461 is used to anchor the bowstring 410 to the upper limb member 400. Bowstring 410 passes through the longitudinal slot and anchors to the lower notch on the lower limb member described in FIG. 4B. As the archer draws the bow bowstring 410 is allowed to freely pass through the longitudinal slot without hitting either body of upper limb member 400.

[0048] Referring now to FIG. 4B, an isometric view of the lower limb member 401 and the attachment mechanism to riser 420. Riser 420 is connected to or may be uniformly made with extensions 422a and 422b. Extensions 422a and 422b are offset as to create a limb pocket 429. Limb pocket 429 may include one more limb attachment mechanisms 430a and 430b. Limb attachment mechanisms 430a and 430b may be separate components affixed to extensions 422a and 422b or integrally formed with extensions 422a and 422b. Limb attachment mechanisms 430a and 430b may comprise one or more mechanical fastener types such as but not limited to screws, nuts and bolts, rivets, swages other interference fittings. Furthermore limb attachment mechanisms 430a and 430b may be fastened in other ways to lower limb member 400 such as but not limited to injection molded, glued, welded, fused, or heat staked. Extensions 422a and 422b as well as limb attachment mechanisms 430a and 430b may be orthogonal to riser 420 or jointly or separately at an angle to riser 420. In the exemplary embodiment shown, extensions 422a and 422b are approximately orthogonal to riser 420 and attachment mechanisms 430a and 430b are angled such that they are neither orthogonal to extensions 422a and 422b nor parallel to riser 420.

[0049] Lower limb member 401 may have one or more limb bodies that each has one or more regions or segments. Lower proximal limb body segments' 435a and 435b may be offset from each other and operatively coupled to limb attachment mechanisms 430a and 430b. The offset of lower proximal limb body segments 435a and 435b defines a longitudinal slot that extends from the proximal end of limb member 401 to lower distal tip 459. Although two limb bodies at an offset are shown in this and other embodiments, it is contemplated and would be obvious to one skilled in the art, that a single limb body with a longitudinal slot that does not extend all the way to the proximal end is within the scope of this disclosure. Lower proximal limb body segments 435a and 435b have a thicker and wider profile thus a more rigid construction than the remainder of lower limb member 401. The thickness and width of lower limb member 401 reduces as the limb body transitions from the lower proximal body segments 424a and 435b to the lower intermediate limb body segments 440a and 440b. The profile and flexibility of lower limb member 401 from lower intermediate limb body segments 440a and 440b to lower distal limb body segments 450a and 450b may be uniform or in other embodiments it may vary but to a lesser amount than the transition from lower proximal limb body segments 435a and 435b to lower intermediate body segments 440a and 440b.

[0050] The curvature of lower limb member 401 is initiated by the attachment mechanisms 430a and 430b. Attachment mechanisms 430a and 430b in the exemplary embodiment shown in FIG. 4B are angled slightly towards the archer from an orthogonal position relative to extensions 422a and 422b. This angle projects the lower proximal limb body segments in an initial curvature towards the archer. The curvature is carried into lower intermediate limb body segments' 440a and 440b where the curvature may be further increased, that is the curvature follows a smaller bend radius. Likewise, the curvature is carried into lower distal limb body segments' 450a and 450b where the curvature may be further increased, decreased or in some embodiments remain constant with the curvature of the prior segment. In the exemplary embodiment shown in FIG. 4B the curvature is greatest in lower intermediate limb body segments 440a and 440b then reduces, that is follows a larger bed radius in the lower distal limb body segments 450a and 450b.

[0051] Lower distal limb body segments' 450a and 450b are joined at the distal end by the lower distal tip 459. Lower distal tip 459 may be integrally and uniformly made with the lower distal limb body segments' 450a and 450b. Yet, in other embodiments lower distal tip 459 may be a separate component that operatively couples and secures lower limb body segments 450a and 450b. Any suitable means for securing lower distal tip 459 to lower distal limb body segments 450a and 450b may be used such as but not limited to those previously mentioned for securing of the limb attachment mechanisms 430a and 430b to the lower proximal limb body segments 435a and 435b. Attached to lower distal tip 459 is lower notch 460. Lower notch 460 likewise may be a separate component or uniformly and integrally formed with the lower distal tip 459. Lower notch 460 is used anchor bowstring 410 to the lower limb member 400. Bowstring 410 passes through the longitudinal slot and anchors to the upper notch on upper limb member 400 described in FIG. 4A. As the archer draws the bow bowstring 410 is allowed to freely pass through the longitudinal slot without hitting either body of lower limb member 400

[0052] In this and other embodiments limb members are shown with a substantially rectangular cross-section however, other embodiments not shown may include different cross-sectional shapes (e.g., polygonal), without departing from the scope of the disclosure. Furthermore, limb members, riser, extensions, and attachment mechanisms may be made of a uniform material or two or more materials that may comprise of a variety of rigid materials including, but not limited to, a plastic, a metal, a composite material, or any suitable material or combination thereof. Example materials include, but are not limited to, hardwoods, nickel titanium alloys (i.e., Nitinol), stainless steels, spring steels, aluminum alloys, magnesium alloys, acetal/POM (e.g. Delrin), nylon, polymer-based structural foams or any combination thereof. Example composite materials include, but are not limited to, fiberglass, carbon fiber, a fiber-reinforced matrix system, filled epoxies (e.g. graphite epoxy), polymer-based syntactic foams, any combination of any of these.

[0053] FIG. 5A shows a lateral view of bow 500 in a fully drawn position. Bow 500 has most of the same construction and configuration as bow 200 in FIG. 2. Bow 500 has an upper stiffening element 511a and a lower stiffening element 511b that slide over bowstring 510. Upper 511a and lower stiffening element 511b may be made from any suitable material that forms a rigid cylindrical sheath over bowstring 510. The upper 511a and lower stiffening element 511b may be a rigid hollow tube with an internal diameter slightly larger than the outer diameter of bowstring 510. The upper 511a and lower stiffening element 511b may be assembled over bowstring 510 during the manufacturing of the bowstring prior to forming the end loops that are used to attach bowstring 510 to the limb tip notches. The upper 511a and lower stiffening element 511b can be held in place in the axial direction bowstring 510 by the use of adhesive between the sheath and the string; or by crimping the end or ends of the upper 511a and lower stiffening element 511b to bowstring 510; or by crimping a band of, for example, a soft metal such as brass, to the bowstring 510 near the end or ends of the upper 511a and lower stiffening element 511b, to act as a mechanical stop; or by creating a knot in bowstring 510 near the end or ends of the upper 511a and lower stiffening element 511b to act as a mechanical stop; or by tying a knot over bowstring 510 with another string material near the end or ends of the upper 511a and lower stiffening element 511b to act as a mechanical stop. In one embodiment the stiffening elements 511a and 511b would made of a material that provides minimal additional mass to the bow string as possible to ensure adequate acceleration of the bow string upon release.

[0054] FIG. 5B is a zoomed in view of area 501 from FIG. 5A. Distal end of upper stiffening element 511a extends from a middle section of bowstring 510, as shown in more detail in FIG. 5C, to the upper distal tip just below the upper distal notch 561. Likewise, though not shown, lower stiffening element 511b extends to the lower distal tip just below the lower distal notch.

[0055] FIG. 5C is a zoomed in view of the middle bowstring section 502 of FIG. 5A. Upper stiffening element 511a extends towards the upper distal tip from a middle section of bowstring 510 but above the arrow nock region of bowstring 510. Likewise lower stiffening element 511b extends towards the lower distal tip from a middle section of bowstring 510 but below the arrow nock region of bowstring 510. It is appreciated by one skilled in the art that the arrow nock region of bowstring 510 could be less than or greater than the unsheathed area shown in this embodiment without departing from the scope of this disclosure.

[0056] FIG. 6 is an isometric view of bow 600 that may incorporate some or all of the principles of bow 500 from FIGS. 5A-5C. Bow 600 may include an upper stiffening element 611a and lower stiffening element 611b that each surround at least a portion of bowstring 610 between upper notch 661 and lower notch 660. Bowstring 610 is anchored to upper notch 661 and lower notch 660 and passes through upper longitudinal slot 601 formed by upper limb body segments 602a and 602b. Likewise, bowstring 610 passes through lower longitudinal slot 604 formed by lower limb body segments 605a and 605b. In a nominal state, stiffening elements 611a and 611b are not in contact with limb body segments 602a, 602b, 605a, or 605b. When the archer draws the bow back to a drawn state, stiffening elements 611a and 611b may come into contact with one or more limb body segments 602a, 602b, 605a, or 605b if limb body segments begin to twist under the stress of the bow being drawn. Stiffening elements 611a and 611b act to control, limit, or stabilize any torsional twisting movement of the limb body segments 602a, 602b, 605a, or 605b during the draw. In one or more embodiments, since stiffening elements 611a and 611b may come into contact with limb body segments 602a, 602b, 605a, or 605b, in at least a portion of the draw and/or release of the bowstring, stiffening elements 611a and 611b are preferably made from or coated with a low friction material such as PTFE, graphite or other suitable lubricious but rigid material. Said stiffening elements 611a and 611b may also be free to rotate about the long axis of each stiffening element's respective string sections, such that if the stiffening elements come into contact with limb body segments 602a, 602b, 605a, 605b, then friction is reduced due a bearing-like rolling action of the stiffening elements over the string.

[0057] FIG. 7 is lateral isometric view of bow 700 that may include some or all of the principles of the present disclosure. Bow 700 is similar to earlier described bow 200 and may include some or all of the same design features. Bow 700 includes riser 720 which further may include an integrated handle 723 as well as upper and lower extensions 721 and 722 respectively. Extensions are operatively coupled or integrally formed with upper and lower attachment mechanisms 731a, 731b, 730a, and 730b. In the present embodiment two upper and two lower limb bodies are show attached to their respective attachment mechanisms at upper and lower proximal limb body segments 734a, 734b, 735a, and 735b respectively. Upper and lower limb members may further include upper and lower intermediate limb body segments 741a, 741b, 740a, and 740b as well as upper and lower distal limb body segments 751a, 751b, 750a, and 750b.

[0058] The upper proximal limb body segments 734a and 734b may be secured at an offset defining an upper longitudinal slot 701 between upper distal tip 761 and the upper attachment mechanisms 731a and 731b. Likewise, lower proximal limb body segments 735a and 735b may be secured at an offset defining a lower longitudinal slot 704 between lower distal tip 760 and the lower attachment mechanisms 730a and 730b. Bowstring 710 is anchored to the upper notch 771 and lower notch 770 and pass through upper longitudinal slot 701 and lower longitudinal slot 704. Proximal limb body segments 734a, 734b, 735a, and 735b are wider and thicker in construction thus giving a stiffer character than intermediate limb body segments 741a, 741b, 740a, and 740b, and the distal limb body segments 751a, 751b, 750a, and 750b. As the limbs progress from proximal to distal the thickness and width of the limb bodies are reduced thus providing for more flexibility.

[0059] In this and other embodiments there may be individual torsional axis between the center of the butt end of the upper and lower proximal limb body segments 734a, 734b, 735a, and 735b and their respective opposed upper and lower distal limb tips 761 and 760. During the draw of bow 700 the upper and lower limb bodies may begin to twist about their torsional axis. To resist the twisting of the upper and lower limb bodies, upper and lower proximal limb body segments 734a, 734b, 735a, and 735b are secured to attachment mechanisms 731a, 731b, 730a, and 730b respectively, at an angular offset so that the pair of upper and lower limb bodies are splayed at a preset angle about their respective torsional axis so that the twisting of each limb side is biased in a manner that the twisting torques from each side are directionally induced to counteract against each other and effectively cancel each other out to a net torque of zero or near zero. The upper and lower limb bodies may be splayed in such a way that the limb bodies may be furthest apart in the upper and lower intermediate limb body segments 741a, 741b, 740a, and 740b respectively and closer together at the upper and lower proximal and distal limb body segments.

[0060] FIG. 8 is posterior view of bow 800 that may include some or all of the principles of the present disclosure. Bow 800 is similar to earlier described bow 700 and may include some or all of the same design features. Bow 800 includes riser 820, which further may include an integrated handle 823, as well as upper and lower extensions (not shown). Extensions are operatively coupled or integrally formed with upper and lower attachment mechanisms 831a, 831b, 830a, and 830b. In the present embodiment two upper and two lower limb bodies are show attached to their respective attachment mechanisms at upper and lower proximal limb body segments 834a, 834b, 835a, and 835b respectively. Upper and lower limb members may further include upper and lower intermediate limb body segments 841a, 841b, 840a, and 840b as well as upper and lower distal limb body segments 851a, 851b, 850a, and 850b.

[0061] The upper proximal limb body segments 834a and 834b may be secured at an offset defining an upper longitudinal slot 801 between upper distal tip (not shown) and the upper attachment mechanisms 831a and 831b. Likewise, lower proximal limb body segments 835a and 835b may be secured at an offset defining a lower longitudinal slot 804 between lower distal tip (not shown) and the lower attachment mechanisms 830a and 830b. Bowstring 810 is anchored to the upper notch 861 and lower notch 860 and pass through upper longitudinal slot 801 and lower longitudinal slot 804.

[0062] In this and other embodiments there may be individual torsional axis between the center of the butt end of the upper and lower proximal limb body segments 834a, 834b, 835a, and 835b and their respective opposed upper and lower distal limb tips (not shown). During the draw of bow 800 the upper and lower limb bodies may begin to twist about their torsional axis. To resist the twisting of the upper and lower limb bodies, upper and lower proximal limb body segments 834a, 834b, 835a, and 835b are secured to attachment mechanisms 831a, 831b, 830a, and 830b respectively, at an angular offset so that the pair of upper and lower limb bodies are splayed at a preset angle about their respective torsional axis. The upper and lower limb bodies may be splayed in such a way that the respective pair of limb bodies may be furthest apart in the upper and lower intermediate limb body segments 841a, 841b, 840a, and 840b respectively and closer together at the upper and lower proximal and distal limb body segments.

[0063] FIG. 9 is an anterior view of bow 900 that may include some or all of the principles of the present disclosure. Bow 900 is similar to earlier described bow 200 and may include some or all of the same design features. Bow 900 includes riser 920 may include an arrow shelf 924 and a sight window 925. In operation an archer would nock an arrow to bowstring 910 and rest the arrow on arrow shelf 924 to keep the arrow stable during draw of the bow. While the bow is drawn the archer would use the sight window 925 to align their shot before releasing the arrow. On opposed ends of riser 920 there is a limb attachment mechanism 931a, 931b, 930a, and 930b for securing the upper and lower limb members to riser 920. In this exemplary embodiment the upper and lower limb members may each be made of two limb bodies each including proximal limb body segments 934a, 934b, 935a, and 935b, intermediate limb body segments 941a, 941b, 940a, and 940b, and distal limb body segments 951a, 951b, 950a, and 950b. The proximal limb body segments 934a, 934b, 935a, and 935b are spaced apart, creating a longitudinal slot between the pair of upper and lower limb bodies. Proximal limb body segments 934a, 934b, 935a, and 935b are wider and thicker in construction thus giving a stiffer character than intermediate limb body segments 941a, 941b, 940a, and 940b, and the distal limb body segments. As the limbs progress from proximal to distal the thickness and width of the limb bodies are reduced thus providing for more flexibility. Bowstring 910 is free to pass through the longitudinal slot and attach to the upper notch 961 and lower notch 960.

[0064] In this and other embodiments there may be individual torsional axis between the center of the butt end of the upper and lower proximal limb body segments 934a, 934b, 935a, and 935b and their respective opposed upper and lower distal limb tips (not shown). During the draw of bow 900 the upper and lower limb bodies may begin to twist about their torsional axis. To resist the twisting of the upper and lower limb bodies, upper and lower proximal limb body segments 934a, 934b, 935a, and 935b are secured to attachment mechanisms 931a, 931b, 930a, and 930b respectively, at an offset. The limb bodies may be secured at an offset where the respective pair of upper and lower bodies may be furthest apart in the upper and lower proximal limb body segments 934a, 934b, 935a, and 935b and grow closer together at the upper and lower intermediate limb body segments and are closest together at the distal limb body segments.

[0065] FIG. 10 is a lateral isometric view of bow 1000 that may include some or all of the principles of the present disclosure. Bow 1000 is similar to earlier described bow 900 and may include some or all of the same design features. Bow 1000 includes riser 1020 may include an arrow shelf 1024 and a sight window 1025. In operation an archer would nock an arrow to bowstring 1010 and rest the arrow on arrow shelf 1024 to keep the arrow stable during draw of the bow. While the bow is drawn the archer would use the sight window 1025 to align their shot before releasing the arrow. On opposed ends of riser 1020 there is a limb attachment mechanism 1031a, 1031b, 1030a, and 1030b for securing the upper and lower limb members to riser 1020. In this exemplary embodiment the upper and lower limb members may each be made of two limb bodies each including proximal limb body segments 1034a, 1034b, 1035a, and 1035b, intermediate limb body segments 1041a, 1041b, 1040a, and 1040b, and distal limb body segments 1051a, 1051b, 1050a, and 1050b. The proximal limb body segments 1034a, 1034b, 1035a, and 1035b are spaced apart and angled towards each other, creating a longitudinal slot between the pair of upper and lower limb bodies. Proximal limb body segments 1034a, 1034b, 1035a, and 1035b are wider and thicker in construction thus giving a stiffer character than intermediate limb body segments 1041a, 1041b, 1040a, and 1040b, and the distal limb body segments. As the limbs progress from proximal to distal the thickness and width of the limb bodies are reduced thus providing for more flexibility. Bowstring 1010 is free to pass through the longitudinal slot and attach to the upper notch 1061 and lower notch 1060.

[0066] In this and other embodiments there may be individual torsional axis between the center of the butt end of the upper and lower proximal limb body segments 1034a, 1034b, 1035a, and 1035b and their respective opposed upper and lower distal limb tips (not shown). During the draw of bow 1000 the upper and lower limb bodies may begin to twist about their torsional axis. To resist the twisting of the upper and lower limb bodies, upper and lower proximal limb body segments 1034a, 1034b, 1035a, and 1035b are secured to attachment mechanisms 1031a, 1031b, 1030a, and 1030b respectively, at one or more offsets such as but not limited to a lateral offset and angular offset relative to their respective torsion axis. The limb bodies may be secured at an offset where the respective pair of upper and lower bodies may be furthest apart in the upper and lower proximal limb body segments 1034a, 1034b, 1035a, and 1035b and grow closer together at the upper and lower intermediate limb body segments and are closest together at the distal limb body segments.

[0067] FIG. 11 is a lateral isometric view of bow 1100 that may include some or all of the principles of the present disclosure. Bow 1100 is similar to earlier described bow 700 and may include some or all of the same design features. Bow 1100 includes riser 1120 may include an arrow shelf 1124 and a sight window 1125. In operation an archer would nock an arrow to bowstring 1110 and rest the arrow on arrow shelf 1124 to keep the arrow stable during draw of the bow. While the bow is drawn the archer would use the sight window 1125 to align their shot before releasing the arrow. On opposed ends of riser 1120 there are extensions 1121 and 1122, which extend to limb attachment mechanism 1131a, 1131b, 1130a, and 1130b for securing the upper and lower limb members to riser 1120. In this exemplary embodiment the upper and lower limb members may each be made of two limb bodies each including proximal limb body segments 1134a, 1134b, 1135a, and 1135b, intermediate limb body segments 1141a, 1141b, 1140a, and 1140b, and distal limb body segments 1151a, 1151b, 1150a, and 1150b. The proximal limb body segments 1134a, 1134b, 1135a, and 1135b are spaced apart and angle, creating a longitudinal slot between the pair of upper and lower limb bodies. Proximal limb body segments 1134a, 1134b, 1135a, and 1135b are wider and thicker in construction thus giving a stiffer character than intermediate limb body segments 1141a, 1141b, 1140a, and 1140b, and the distal limb body segments. As the limbs progress from proximal to distal the thickness and width of the limb bodies are reduced thus providing for more flexibility. Bowstring 1110 is free to pass through the longitudinal slot and attach to the upper notch 1161 and lower notch 1160.

[0068] In this and other embodiments there may be individual torsional axis between the center of the butt end of the upper and lower proximal limb body segments 1134a, 1134b, 1135a, and 1135b and their respective opposed upper and lower distal limb tips (not shown). During the draw of bow 1100 the upper and lower limb bodies may begin to twist about their torsional axis. To resist the twisting of the upper and lower limb bodies, upper and lower proximal limb body segments 1134a, 1134b, 1135a, and 1135b are secured to attachment mechanisms 1131a, 1131b, 1130a, and 1130b respectively, at one or more offsets such as but not limited to a lateral offset and angular offset relative to their respective torsion axis. The limb bodies may be secured at an offset so that the pair of upper and lower limb bodies are splayed at a preset angle about their respective torsional axis. The upper and lower limb bodies may be splayed in such a way that the respective pair of limb bodies may be furthest apart in the upper and lower intermediate limb body segments 1141a, 1141b, 1140a, and 1140b respectively and closer together at the upper and lower proximal and distal limb body segments.

[0069] FIG. 12 is posterior view of bow 1200 that may include some or all of the principles of the present disclosure. Bow 1200 is similar to earlier described bow 1100 and may include some or all of the same design features. Bow 1200 includes riser 1220, which further may include an integrated handle 1223, as well as upper and lower extensions 1221 and 1222. Extensions 1221 and 1222 are operatively coupled or integrally formed with upper and lower attachment mechanisms 1231a, 1231b, 1230a, and 1230b. In the present embodiment two upper and two lower limb bodies are show attached to their respective attachment mechanisms at upper and lower proximal limb body segments 1234a, 1234b, 1235a, and 1235b respectively. Upper and lower limb members may further include upper and lower intermediate limb body segments 1241a, 1241b, 1240a, and 1240b as well as upper and lower distal limb body segments 1251a, 1251b, 1250a, and 1250b.

[0070] The upper proximal limb body segments 1234a and 1234b may be secured at an offset defining an upper longitudinal slot 1201 between upper distal tip (not shown) and the upper attachment mechanisms 1231a and 1231b. Likewise, lower proximal limb body segments 1235a and 1235b may be secured at a lateral and angular offset defining a lower longitudinal slot 1204 between lower distal tip (not shown) and the lower attachment mechanisms 1230a and 1230b. Bowstring 1210 is anchored to the upper notch 1261 and lower notch 1260 and pass through upper longitudinal slot 1201 and lower longitudinal slot 1204.

[0071] In this and other embodiments there may be individual torsional axis between the center of the butt end of the upper and lower proximal limb body segments 1234a, 1234b, 1235a, and 1235b and their respective opposed upper and lower distal limb tips (not shown). During the draw of bow 1200 the upper and lower limb bodies may begin to twist about their torsional axis. To resist the twisting of the upper and lower limb bodies, upper and lower proximal limb body segments 1234a, 1234b, 1235a, and 1235b are secured to attachment mechanisms 1231a, 1231b, 1230a, and 1230b respectively, at one or more offsets such as but not limited to a lateral offset and angular offset relative to their respective torsion axis. The upper and lower limb bodies may be splayed in such a way that the respective pair of limb bodies may be furthest apart in the upper and lower intermediate limb body segments 1241a, 1241b, 1240a, and 1240b respectively and closer together at the upper and lower proximal and distal limb body segments.

[0072] For reference purposes of FIGS. 13G-13G the terms proximal and distal are defined herein relative to an archer using the embodied bow. The term proximal refers to the movement or position towards or closer to the archer and the term distal refers to the movement or position away or further from the archer. Moreover, the use of directional terms such as above, below, upper, lower, upward, downward, left, right, and the like are used to the illustrative embodiments as they are depicted in the figures, the upward or upper direction being towards the top of the corresponding figure and the downward or lower direction being towards the bottom of the corresponding figure.

[0073] Referring now to FIGS. 13A-13G, which show a lateral sequential view of bow 1300 from an unstrung state 1300.1 to a maximum drawn state 1300.7. For means of reference only, bow 1300 is similar to earlier described bow 200 and may include some or all of the same design features. However, bow 1300 may also comprise some or all of the principles in the present disclosure and not limited to just those found on exemplary embodiment of bow 200. Bow 1300 is shown in a first state 1300.1 in which the one or more bow limb bodies are not stressed. Positions of intermediate limb body segments 1341, distal limb body segments 1351 and distal notch 1361 are noted to be in their initial starting positions. When bowstring 1310 is added to bow 1300 as seen in 1300.2 the bow limbs become stressed and compress into a second state 1300.2. In the second state 1300.2 the distal notch 1361 is pulled down from the initial state 1300.1, the intermediate limb body segments 1341 shift proximally and the curvature between intermediate limb body segments 1341 and distal limb body segments 1351 becomes tighter. When the archer draws bow 1300, by pulling bowstring 1310 in a proximal direction, bow 1300 transitions from a second state 1300.2 to a third state 1300.3. The bow limbs become further stressed and compress further into third state 1300.3. In third state 1300.3 the distal notch 1361 is pulled down from the second state 1300.2, the intermediate limb body segments 1341 shift proximally and the curvature between intermediate limb body segments 1341 and distal limb body segments 1351 becomes tighter as compared to second state 1300.2. As bowstring 1310 continues to be drawn proximally, bow 1300 transitions from a third state 1300.3 to a fourth state 1300.4. The bow limbs become further stressed and compress further into fourth state 1300.4. In the fourth state 1300.4 the distal notch 1361 is pulled down and shifts proximally from the third state 1300.3, the intermediate limb body segments 1341 continue to shift proximally and the curvature between intermediate limb body segments 1341 and distal limb body segments 1351 becomes tighter as compared to third state 1300.3. As bowstring 1310 continues to be drawn proximally, bow 1300 transitions from a fourth state 1300.4 to a fifth state 1300.5. In the fifth state 1300.5 the distal notch 1361 begins to slightly move back upward but continues to shift proximally from the fourth state 1300.4, the intermediate limb body segments 1341 continue to shift proximally and the curvature between intermediate limb body segments 1341 and distal limb body segments 1351 begins to lessen, that is create a curve with a larger bend radius as compared to fourth state 1300.4. As bowstring 1310 continues to be drawn proximally, bow 1300 transitions from a fifth state 1300.5 to a sixth state 1300.6. In the sixth state 1300.6 the distal notch 1361 continues to move upward and shift proximally from the fifth state 1300.5, the intermediate limb body segments 1341 continue to shift proximally and the curvature between intermediate limb body segments 1341 and distal limb body segments 1351 continues to lessen as compared to fifth state 1300.5. Finally, as max draw length of bowstring 1310 is achieved, bow 1300 transitions from a sixth state 1300.6 to a seventh state 1300.7. In the seventh state 1300.7 the distal notch 1361 continues to move slightly upward and shift proximally from the sixth state 1300.6, the intermediate limb body segments 1341 continue to shift proximally and the curvature between intermediate limb body segments 1341 and distal limb body segments 1351 continues to lessen as compared to sixth state 1300.6.

[0074] D2-D7 in their respective figures illustrates the straight-line distance between the lower notch areas of the limb tips. Where in one preferred embodiment, D2 is greater than D3, D4, D5, D6, & D7 throughout the entire draw and release cycle of bow 1300. Additionally, A2-A7 in their respective figures illustrates the bowstring angle. In one preferred embodiment A3, A4, A5, A6, A7 is less than 180 degrees throughout the entire draw and release cycle of bow 1300.

[0075] FIG. 14. is an overlaid lateral view of the six curvature states of the upper limb member shown in FIGS. 13B-13G. Line 1701 traces the movement of the upper notch 1361 as bow 1300 is drawn from a second state 1702 through third state 1703, fourth state 1704, fifth state 1705, sixth state 1706, and seventh state 1707 where bow 1300 as reached the final or maximum draw position. In this exemplary embodiment upper notch 1361 starts in the highest position in the strung second state 1702 before any draw of bowstring 1310 occurs. As bowstring 1310 is drawn proximal the upper notch 1361 begins to drop and move proximally until reaching fourth state 1704 at which point upper notch 1361 begins to migrate back up while continuing to move proximally to seventh state 1707. The final position of upper notch 1361 in the seventh state 1707 is higher than the lowest position achieved in the fourth state 1704 but lower than the highest position in the second state 1702.

[0076] The exemplary embodiment shown in FIGS. 13A-13G and FIG. 14 shows a bow with seven curvature states and is for demonstrations purposes and in no way limiting. It is contemplated without departure from the scope of this disclosure that other bow configurations are possible which may have more or less number of curvature states that the embodiment depicted. Likewise, only the upper limb member is shown in the exemplary embodiment of FIGS. 13A-13G and FIG. 14, it obvious to one skilled in the art that the lower limb member is transforming at the same time as the upper limb member.

[0077] FIG. 16 demonstrates a simulated force draw curve of various bows found in the prior art. As seen in the graph for a typical recurve bow, the force continues to rise as the archer draws the bowstring. The rate at which the force increases per unit of draw length may vary over the entire length of the draw, but, it is always increasing. This change in rate may feel to the user as if a let-off or reduction in force has occurred even though the force has continued to climb. Conversely, for a slotted recurve (such as the Bodkin and Foothills Bow), the force does indeed reduce at a setpoint of the draw. However, the force doesn't just reduce, it drops to zero. This is problematic and undesirable for several reasons. The energy stored in the limbs at the zero-force point can lead to instability and twisting or buckling of the limbs which may further lead to structural fracture or failure of the limbs. Another undesirable outcome is that when the bow reaches the zero-force state, it is likely to do so very rapidly. This rapid transition to the zero-force state can cause the limbs to snap into a lower energy state which in turn may cause the bowstring to move rearwardly faster than the archer is expecting. Unexpected movement of the bowstring and/or limbs can create a undesirable loss of control and or nocking of the arrow by the archer.

[0078] What is desirable is the curve shown in FIG. 16 of the typical compound bow. The force rises as the archer draws the bow back until an intermediate point is reached at which point the archer has experienced the maximum force, before a let-off occurs that lowers the force to a given percentage below than the maximum force but not to zero.

[0079] FIG. 15 is a graph depicting a force draw curve of a bow embodying one or all of the principles of the present disclosure. The y-axis displays a normalized draw force scale while the x-axis displays a normalized draw length scale.

[0080] In a modern compound bow the archer is able to draw the bowstring back to an intermediate position (between initial and maximum draw lengths) where the peak draw force is experienced. After the peak draw force is experienced, the draw force drops by some percentage and remains at that lower force for the remainder of the draw. Traditional bows like the long bow and recurve bow typically increase in force as the draw length increases and maximum draw force is experienced at the maximum draw length. Improvements to traditional bows have been attempted before to mirror the experience of drawing a modern compound bow. However these improvements failed to shift the peak draw force to an intermediate position but instead changed the slope of the draw force curve so that the archer experiences less force per draw length. That is to say the slope of the line may increase normally but then at some intermediate position begin to flatten out so that the archer feels like the force has reduced since they are achieving more length per unit force. This change in slope does not actually reduce the force as force continues to rise albeit at a slower rate.

[0081] Referring again to FIG. 15 which shows a bow that may embody one or all of the principles of the present disclosure as the bow is drawn from an initial second state 1702, where the bow is strung but not yet drawn to maximum draw length seventh state 1707. As the archer begins to draw bowstring 1310 the force begins to go up as the bow transitions from second state 1702 to third state 1703, fourth state 1704, and fifth state 1705. At the fifth state 1705 the archer experiences the peak draw force, which like a compound bow, is between the initial and maximum draw lengths. As the archer continues to draw the bow past the point of the peak draw force, the force experienced by the archer drops by a percentage to a final draw force at the sixth state 1706 similar to that of a compound bow. From the sixth state 1706 to the seventh state 1707, where the maximum draw length occurs, the draw force remains constant or close to constant at the reduced level.

[0082] Embodiments disclosed herein include:

[0083] A. A traditional bow includes a riser with an upper and lower end. A first limb member provided at the upper end of the riser, the first limb member includes a first and second body with proximal and a distal ends, the proximal ends of the first limb member are coupled to the upper end of the riser. A first tip couples the distal ends of the first and second bodies and includes a first notch extending radially from the first tip. A first longitudinal slot extends between the first and second bodies at least partially between the upper end of the riser and the first tip. A second limb member provided at the lower end of the riser, the second limb member includes a third and fourth body with proximal and a distal ends, the proximal ends of the second limb member are coupled to the lower end of the riser. A second tip couples the distal ends of the third and fourth bodies and includes a second notch extending radially from the second tip. A second longitudinal slot extends between the third and fourth bodies at least partially between the lower end of the riser and the second tip. A bowstring is operatively coupled between the first limb notch and second limb notch and passes through the first and second longitudinal slots. The first and second limb notches pass through three or more states as the bowstring is drawn from an initial resting position to a maximum draw length. The first and second notches being furthest apart at a first state, closest together in an intermediate state, and at a position between the furthest and closest position in a final state.

[0084] B. A traditional bow includes a riser with an upper and lower end. A first limb member provided at the upper end of the riser, the first limb member includes a first and second body with proximal and a distal ends, the proximal ends of the first limb member are coupled to the upper end of the riser. A first tip couples the distal ends of the first and second bodies and includes a first notch extending radially from the first tip. A first longitudinal slot extends between the first and second bodies at least partially between the upper end of the riser and the first tip. A second limb member provided at the lower end of the riser, the second limb member includes a third and fourth body with proximal and a distal ends, the proximal ends of the second limb member are coupled to the lower end of the riser. A second tip couples the distal ends of the third and fourth bodies and includes a second notch extending radially from the second tip. A second longitudinal slot extends between the third and fourth bodies at least partially between the lower end of the riser and the second tip. A bowstring is operatively coupled between the first limb notch and second limb notch and passes through the first and second longitudinal slots. The bowstring having one or more stiffening elements surrounding at least a portion of the length the bowstring that passes through the first and second longitudinal slots; The first and second limb notches pass through three or more states as the bowstring is drawn from an initial resting position to a maximum draw length. The first and second notches being furthest apart at a first state, closest together in an intermediate state, and at a position between the furthest and closest position in a final state.

[0085] C. A traditional bow includes a riser with an upper and lower end. A first limb member provided at the upper end of the riser, the first limb member includes a first and second body with proximal and a distal ends, the proximal ends of the first limb member are coupled to the upper end of the riser so that the first and second bodies are splayed and have non-planer surfaces. A first tip couples the distal ends of the first and second bodies and includes a first notch extending radially from the first tip. A first longitudinal slot extends between the first and second bodies at least partially between the upper end of the riser and the first tip. A second limb member provided at the lower end of the riser, the second limb member includes a third and fourth body with proximal and a distal ends, the proximal ends of the second limb member are coupled to the lower end of the riser so that the third and fourth bodies are splayed and have non-planer surfaces. A second tip couples the distal ends of the third and fourth bodies and includes a second notch extending radially from the second tip. A second longitudinal slot extends between the third and fourth bodies at least partially between the lower end of the riser and the second tip. A bowstring is operatively coupled between the first limb notch and second limb notch and passes through the first and second longitudinal slots. The first and second limb notches pass through three or more states as the bowstring is drawn from an initial resting position to a maximum draw length. The first and second notches being furthest apart at a first state, closest together in an intermediate state, and at a position between the furthest and closest position in a final state.

[0086] Each of embodiments A, B, and C may have one or more of the following additional elements in any combination: Element 1: wherein a straight line distance D is defined between the point where the bowstring is coupled to the first and second notches; and the straight line distance D, during the draw of the bowstring from the initial state to the final state, is less than the straight line distance D in the initial state. Element 2: wherein the draw of the bowstring defines an inside angle near the center of the bowstring; and the inside angle is less than 180 degrees during the draw from the initial resting position to the maximum draw length position. Element 3: wherein a peak draw force of the bow occurs between the initial resting position and the maximum draw length position, and a reduced draw force occurs at the maximum draw length position. Element 4: wherein the first, second, third and fourth bodies comprise three or more body segments. Element 5: wherein the body segment closest to the riser is thicker and wider in construction than the last body segment closest to the first and second notches. Element 6: wherein the proximal end of the first, second, third and fourth bodies are less flexible than the distal end of the first, second, third and fourth bodies. Element 7: wherein the riser is operatively coupled to one or more extension members that project proximally relative to the riser. Element 8: wherein the extensions define a pocket and are operatively couple to one or more attachment mechanisms for securing the first and second limb members.

[0087] By way of non-limiting example, exemplary combinations applicable to A, B, and C include: Element 1 with Element 2; Element 2 with Element 3; Element 3 with Element 4; Element 4 with Element 5; Element 5 with Element 6; Element 6 with Element 7; Element 7 with Element 8; Element 1 with Element 3; Element 1 with Element 4; Element 1 with Element 5; Element 1 with Element 6; Element 1 with Element 7; Element 1 with Element 8; Element 2 with Element 3; Element 2 with Element 4; Element 2 with Element 5; Element 2 with Element 6; Element 2 with Element 7; Element 2 with Element 8; Element 3 with Element 4; Element 3 with Element 5; Element 3 with Element 6; Element 3 with Element 7; Element 3 with Element 8; Element 4 with Element 5; Element 4 with Element 6; Element 4 with Element 7; Element 4 with Element 8; Element 5 with Element 6; Element 5 with Element 7; Element 5 with Element 8; Element 6 with Element 7; Element 6 with Element 8; and Element 7 with Element 8.

[0088] Therefore, the disclosed systems and methods are well adapted to attain the ends and advantages mentioned as well as those that are inherent therein. The particular embodiments disclosed above are illustrative only, as the teachings of the present disclosure may be modified and practiced in different but equivalent manners apparent to those skilled in the art having the benefit of the teachings herein. Furthermore, no limitations are intended to the details of construction or design herein shown, other than as described in the claims below. It is therefore evident that the particular illustrative embodiments disclosed above may be altered, combined, or modified and all such variations are considered within the scope of the present disclosure. The systems and methods illustratively disclosed herein may suitably be practiced in the absence of any element that is not specifically disclosed herein and/or any optional element disclosed herein. While compositions and methods are described in terms of comprising, containing, or including various components or steps, the compositions and methods can also consist essentially of or consist of the various components and steps. All numbers and ranges disclosed above may vary by some amount. Whenever a numerical range with a lower limit and an upper limit is disclosed, any number and any included range falling within the range is specifically disclosed. In particular, every range of values (of the form, from about a to about b, or, equivalently, from approximately a to b, or, equivalently, from approximately a-b) disclosed herein is to be understood to set fourth every number and range encompassed within the broader range of values. Also, the terms in the claims have their plain, ordinary meaning unless otherwise explicitly and clearly defined by the patentee. Moreover, the indefinite articles a or an, as used in the claims, are defined herein to mean one or more than one of the elements that it introduces. If there is any conflict in the usages of a word or term in this specification and one or more patent or other documents that may be incorporated herein by reference, the definitions that are consistent with this specification should be adopted.

[0089] As used herein, the phrase at least one of preceding a series of items, with the terms and or or to separate any of the items, modifies the list as a whole, rather than each member of the list (i.e., each item). The phrase at least one of allows a meaning that includes at least one of any one of the items, and/or at least one of any combination of the items, and/or at least one of each of the items. By way of example, the phrases at least one of A, B, and C or at least one of A, B, or C each refer to only A, only B, or only C; any combination of A, B, and C; and/or at least one of each of A, B, and C.