Broadhead blade impact energy transfer apparatus and method

Abstract

A broadhead blade impact energy transfer apparatus and method consisting of a support structure with a first end and a second end. A blade is rotatably attached with the support structure such that the blade is movable from a first position to a second position where the blade has a leading cutting edge and a trailing edge and a connection point and an extended tip and where the connection point is connected with the support structure. A pressure device is connected in the support structure where the pressure device is configured to pressure the connection point of the blade such that the blade is pressured toward the first end of the support structure and to the first position and to yield to force applied to the blade and enable the blade to move to the second position.

Claims

1. A broadhead blade impact energy transfer apparatus comprising: a. a support structure with a first end and a second end; b. a blade rotatably attached with the support structure such that the blade is movable from a first position to a second position wherein said blade has a leading cutting edge and a trailing edge and a connection point and an extended tip wherein the connection point is connected with the support structure; c. a pressure device connected in said support structure wherein said pressure device is configured to pressure said connection point of said blade such that said blade is pressured toward said first end of said support structure and to the first position and to yield to force applied to the blade and enable said blade to move to the second position; and d. a centering device on said blade wherein the centering device cooperates with the pressure device to center the blade in the first position.

2. The apparatus of claim 1 wherein the extended tip of said blade is a dull compared to the cutting edge.

3. The apparatus of claim 1 wherein the extended tip of the blade is dull compared to the cutting edge and C-shaped.

4. The apparatus of claim 1 wherein the support structure includes a blade stop such that upon movement of said blade to the second position said trailing edge of said blade contacts said blade stop preventing said blade from moving further such that over compression of said pressure device is prevented and impact energy is transferred to the support structure and away from the blade connection point.

5. The apparatus of claim 1 further including a front blade and a rear blade.

6. The apparatus of claim 1 further including a front blade and a rear blade with a pressure device connected with the front blade and a pressure device connected with the rear blade.

7. The apparatus of claim 1 wherein the centering device includes a cam lobe form.

8. The apparatus of claim 1 wherein the pressure device includes a ball bearing contact form configured to transfer pressure from the pressure device to the blade and from the blade to the pressure device.

9. The apparatus of claim 8 wherein the centering device includes a cam lobe form and the ball bearing contact form cooperates with the cam lobe form to hold the blade in the extended first position.

10. A broadhead blade impact energy transfer apparatus comprising: a. a support structure with a first end and a second end; b. a front blade and a rear blade rotatably attached with the support structure such the front blade and rear blade are movable from a first position to a second position wherein said front blade and rear blade have a leading cutting edge and a trailing edge and a connection point and an extended tip wherein the connection point is connected with the support structure and wherein the extended tip of said front blade and rear blade is dull compared to the cutting edge; c. a pressure device connected behind both said front blade and said rear blade in said support structure such that the front blade and the rear blade are closer to the first end of the support structure than said pressure device to which it is connected and wherein said pressure device is configured to pressure said connection point of said front blade and said rear blade such that said blades are pressured toward said first end of said support structure and to the first position and to yield to force applied to the blades and enable said blades to move to the second position; and d. a blade stop such that upon movement of either said front blade or said rear blade to the second position said trailing edge of said blade contacts said blade stop and prevents said blade from moving further such that over compression of said pressure device is prevented and impact energy is transferred to the support structure and away from the connection point.

11. The apparatus of claim 10 wherein the extended tip of the blade is C-shaped.

12. The apparatus of claim 10 further including a centering device in the front blade and the rear blade configured to co-operate with the pressure device to maintain the front blade and the rear blade in the first position.

13. The apparatus of claim 12 wherein the centering device includes a cam lobe form.

14. The apparatus of claim 10 wherein the pressure device includes a ball bearing contact form configured to transfer pressure from the pressure device to the front blade and to the rear blade and from the front blade and the rear blade to the pressure device.

15. The apparatus of claim 14 wherein the centering device includes a cam lobe form and the ball bearing contact form cooperates with the cam lobe form to hold the front blade and the rear blade in the extended first position.

16. A broadhead blade impact energy transfer method consisting of: a. providing a support structure with a first end and a second end; a blade rotatably attached with the support structure such that the blade is movable from a first position to a second position wherein said blade has a leading cutting edge and a trailing edge and a connection point and an extended tip wherein the connection end is connected with the support structure; and a pressure device wherein said pressure device is configured to pressure said connection point of said blade such that said blade is pressured toward said first end of said support structure and to the first position and to yield to force applied to the blade and enable said blade to move to the second position and a centering device on said blade wherein the centering device cooperates with the pressure device to center the blade in the first position; and b. attaching said support structure to an arrow shaft.

17. The method of claim 16 wherein the support structure includes a blade stop such that upon movement of said blade to the second position said trailing edge of said blade contacts said blade stop preventing said blade from moving further such that over compression of said pressure device is prevented and impact energy is transferred to the support structure and away from the blade connection point.

18. The method of claim 16 further including a front blade and a rear blade with a pressure device connected with the front blade and a pressure device connected with the rear blade.

19. The method of claim 16 wherein the extended tip of said blade is a dull compared to the cutting edge.

20. The method of claim 16 wherein the pressure device includes a ball bearing contact form configured to transfer pressure from the pressure device to the blade and from the blade to the pressure device.

Description

DESCRIPTION OF THE DRAWINGS

(1) Other objects, features and advantages of the present invention will become more fully apparent from the following detailed description of the preferred embodiment, the appended claims and the accompanying drawings in which:

(2) FIG. 1 is a top schematic view of the broadhead blade energy transfer apparatus of the present invention with a front blade and a rear blade in the extended first position with a pressure device behind each of the blades;

(3) FIG. 2 is a side perspective view of the invention of FIG. 1 without the support structure and showing the front and rear blades in the first position;

(4) FIG. 3 is a side perspective view of the invention of FIGS. 1 and 2 illustrating the movement of one side of the front blade upon impact to the second position;

(5) FIG. 4 is a close up side perspective view of FIG. 3 showing the trailing edge of one side of the front blade in contact with the blade stop;

(6) FIG. 5 is a top close up view of the invention of FIG. 1 showing the dull, C-shaped extended tip of the blade; and

(7) FIG. 6 is a perspective cut away view of the invention of FIG. 1 showing the operation of the centering device in a front blade and a rear blade.

DETAILED DESCRIPTION OF EMBODIMENTS

(8) Before explaining at least one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced and carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein are for the purpose of description and should not be regarded as limiting.

(9) As such, those skilled in the art will appreciate that the conception, upon which this disclosure is based, may readily be utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention. It is important, therefore, that the invention be regarded as including equivalent constructions to those described herein insofar as they do not depart from the spirit and scope of the present invention.

(10) In addition, features illustrated or described as part of one embodiment can be used on other embodiments to yield a still further embodiment. Additionally, certain features may be interchanged with similar devices or features not mentioned yet which perform the same or similar functions. It is therefore intended that such modifications and variations are included within the totality of the present invention.

(11) It should also be noted that a plurality of hardware devices, as well as a plurality of different structural components, may be utilized to implement the invention. Furthermore, and as described in subsequent paragraphs, the specific configurations illustrated in the drawings are intended to exemplify embodiments of the invention and that other alternative configurations are possible.

(12) One embodiment of the present invention is illustrated by way of example in FIGS. 1-5. An additional description of the invention is found in the attached Specification_2 submitted herewith and incorporated herein.

(13) Referring to FIG. 1, a broadhead blade energy transfer apparatus 10 consists of a support structure 12 with a first end 14 and a second end 16. A front blade 18 has a leading cutting edge 20 and a trailing edge 22 and a connection point 24 and an extended tip 26 and where the connection point 24 is connected with the support structure 12.

(14) FIG. 1 shows a single front blade 18 as is preferred for “Guillotine” type devices. Front blade 18 is rotatably attached with the support structure 12 by pivot connection 28 at connection point 24 such that the blade 18 is rotatably movable from a first (“extended”) position as shown in FIGS. 1 and 2, to a second (“compressed”) position as shown in FIGS. 3-4. By “compressed” it is meant that one side of the single blade 18 rotates away from contact as shown. As shown, preferably there are more than one blades as with a blade 18 and, as shown, preferably a rear blade 30 (seen end on in FIG. 1).

(15) A pressure device 32 is connected with the front blade 18 behind, preferably, the front blade 18 (and the rear blade 30 when present), That is, the front blade 18 is closer to the first end 14 of support structure 12 than the pressure device 32. In other words, pressure device 32 is located behind front blade 18 (and rear blade 30 when present) in support structure 12 as illustrated. Certainly, the pressure device 32 may be located in other places relative to the blades such as in front of the front blade 18, for example only and not by limitation.

(16) Wherever it is located, pressure device 32 is configured to pressure the front blade 18 to the fully extended first position, essentially, perpendicular to the support structure 12 as shown in FIGS. 1 and 2 such that front blade 18 is pressured toward the first end 14 of the support structure 12 and to the first position. In operation, however, pressure device 32 yields to force applied to the front blade 18 and enables the front blade 18 to move to the second position shown in FIGS. 3 and 4.

(17) Referring to FIG. 6, the front blade 18, and rear blade 30 when present, include a centering device 25 at the connection point 24. Centering device 25 co-operates with the pressure device 32 to automatically align and reset front blade 18 to the first position, perpendicular to support structure 12. As shown, pressure device 32 preferably includes a ball bearing contact form 33 that contacts the centering device 25. The ball bearing contact form 33 is forced against the centering device 25 and the cam lobe form 27 of centering device 25 causes the front blade 18 to rotate around pivot connection 28 to return to the first position. Likewise, centering device 25 moves upon contact of the front blade 18, extended tip 26, with a target and the cam lobe form 27 of centering device 25 compresses pressure device 32 allowing blade 18 to move to the second position.

(18) FIG. 6 shows the operation of centering device 25 where the front blade 18 shows the preferred cam lobe form 27 of the centering device 25 on the blade 18 forcing the allowed full compression distance of pressure device 32. However, FIG. 6 shows clearly that the structure of the cam lobe form 27 of centering device 25 ensures that the spring element of the pressure device 32 is not fully, or over, compressed and so will not be damaged.

(19) FIG. 6 also illustrates by way of the rear blade 30, the “Ready to shoot” position where spring force/ball bearing, pressure device 32 and the centering device 25 of the blade 30 interact so as to self-align the blade 30 with respect to the support structure 12 in the preferred, repeatable horizontally extended first position.

(20) In operation, the extended tip 26 of a front blade 18, which is dull compared to cutting edge 20, impacts the target but does not cut through the target as the cutting edge 20 does. Instead, extended tip 26 absorbs the impact energy and transfers it to the front blade 18. Pressure device 32 yields under this impact pressure and allows front blade 18 to rotate backwards to the second position. This feature alone greatly enhances the likelihood that the single extended “rigid” front blade 18 will not break at impact as is the case in the art presently. In one aspect, the extended tip 26 of the blade 18 is dull compared to the cutting edge and also C-shaped. “C-shaped” describes a half moon form as shown in the figures. Applicant has determined this C-shaped form of a dull tip 26 is most effective in absorbing and transferring impact energy as described more fully hereafter.

(21) FIG. 1 also illustrates in dashed lines an arrow shaft 34 to which support structure 12 may be removably attached, as is known in the art.

(22) Referring now to FIGS. 3 and 4, in a preferred embodiment of the present invention, the support structure 12 includes a blade stop 36 such that upon movement of the blade 18 to the second position (See FIGS. 3 and 4) the trailing edge 22 of one side of the blade 18 contacts the blade stop 36 preventing the blade 18 from moving further. As shown, blade 18 extends from support structure 12 in a slot 38. Blade stop 36 is located at the rear end of the slot 36 such that further rearward movement of blade 18 is prevented. Blade stop 36 may be the end of the slot 38 formed by the support structure 12 itself or a reinforced area at that point, for example only and not by limitation. In any event, blade stop 36 operates such that over compression of the pressure device 32 is prevented and residual impact energy is transferred to the support structure 12 and away from the rotatable blade attachment, pivot connection 28. Applicant has determined that this structure greatly reduces blade fracture and breakage by spreading residual impact energy not absorbed initially to the support structure 12 itself and away from the pivot connection 28 alone.

(23) Preferably, again, as illustrated, a second, rear, blade 30 is provided. As with front blade 18, preferably pressure device 32 is present in this configuration as well and operates as described with regard to front blade 18.

(24) By way of further description, this novel approach applies Applicant's patented “blade compressibility” in a reverse manner compared to big game animal broadheads. This means that the present structure is engineered to provide a high enough impact load resistance from the extended dull 26 tip via a cam shaped 27 centering device 25 and blade/ball bearing/spring interaction, pressure device 32, (as illustrated) to easily and ethically kill the target animal. The present invention instantly allows the blade to yield position (from the extended first position to the collapsed second position) to reduce impact energy on the blade by providing a spring compression distance break over point to the compression capability. This centering device cam action transfers blade impact force through a ball bearing and spring (the preferred embodiment of pressure device 32) which compresses to absorb the load. Additionally, blade stop 36 acts to continue to transfer any residual energy to the support structure 12 body of the broadhead and arrow shaft. The pressure device 32 absorbs the majority of the potential harmful blade destructive energy and allows time for the transfer of residual energy from the broadhead blade to the broadhead body/arrow shaft 34 through blade stop 36. Through this suspension loading capability, the present invention tremendously increases the durability and instant reusability of the rigid blade, “Guillotine” style, category of small game/bird broadheads. In sum, the present invention protects blade 18, and 30 when present, from breaking and damage.

(25) An additional unique aspect of this present design structure is that of the geometry interaction between the load bearing surface of, for example, a “Ball Bearing” or similar hardened wear ball bearing contact form 33, between blade 18 and the rest of pressure device 32. The unique geometry of the blade 18, or plurality of blades, in combination with centering device 25, is engineered to move the blade 18 from a set static “first” position to a lesser “second” position during and after impact with the target animal. It is also a critically unique structural cam lobe 27 design of centering device 25 that uses this spring force/ball bearing contact form 33 geometry of the pressure device 32 to “Self Align” the blade to the same physical position. Meaning, the spring force of pressure device 32 wedges the steel ball bearing 33 into the blade cam lobe 27 geometry of centering device 25 and holds the blade 18 in the desired firing, extended first position, automatically. The cam lobe 27 geometry of centering device 25 is also engineered in such a manner so as to allow absorption of the impact energy via pressure device 32, such as any spring like/compressible material as known, which compresses and rebounds to the initial resting state and thus resets to the “Ready to fire” position. Thus additionally solving for, and allowing achievement of, repeatable aerodynamic properties that enhance need of repeatable accuracy with all sharpened blades utilized on both fixed mechanical and such guillotine style broadheads.

(26) Another unique aspect of the present invention is that each of the extended tip 26 ends of the blades 18 includes a section of blade 18 where there is no sharp feature. Instead, this section is dull compared to the cutting edge 20 and is a section engineered to be a first strike section of the blade 18. Because it is “dull” it drags a bit on contact with a target instead of cutting through it. Thus, this structure utilizes leverage force to begin the compression cycle without damaging the blade 18 as described herein. This complete system delivers the balance to achieve beheading of the bird/small game animal for a quick, ethical kill with a so called rigid blade structure. Yet this structure also includes impact absorption and energy transfer so as to reduce blade breakage and enhance tremendously the durability and instant reusability of the broadhead. Uniquely, the shape of geometry of the centering device 25 and resulting control of forces encountered in use also ensures that the pressure device 32 is never over compressed and damaged through normal or abnormal use.

(27) Further, the body of the broadhead is engineered to compliment, at full compression of the blade to the second position, to provide mechanical support of the blade on the backside at the blade stop 36 so all of the residual energy is not focused upon the mounting through connection point 24 hole/set screw/pivot point 28 interaction. This mechanical support interaction with the backside trailing edge 22 of the blade 18 some distance away from the through hole/set screw mounting/pivot connection point 24 and pivot connection 28 location further substantially aids in increased durability and usability.

(28) The description of the present embodiments of the invention has been presented for purposes of illustration, but is not intended to be exhaustive or to limit the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. As such, while the present invention has been disclosed in connection with an embodiment thereof, it should be understood that other embodiments may fall within the spirit and scope of the invention as defined by the following claims.