Seat suspension system

Abstract

The present invention is a seat bottom suspension system adapted to provide a varying spring constant. An embodiment includes a first plurality of generally flat elongated biasing members in communication with an axle adapted to translate in a direction generally parallel with the longitudinal axis of the biasing members. An embodiment may include a second set of flat elongated biasing members set at a lower height than the first plurality of flat elongated biasing members to provide a progressive increase in the spring constant as the down force seen on the seat increases.

Claims

1. A seat suspension system, comprising: a seat bottom having at least two separated, parallel walls with an open cavity established therebetween; at least one biasing member disposed within the open cavity, wherein the biasing member further includes: a first end, a second end, and a fixed length extending therebetween; the first end located near one of the walls; and an axle located near the second wall, the axle having a length extending generally perpendicular in relation to the elongated biasing member and a set of guides extending in a perpendicular direction to secure the elongated biasing member to a set location along the length of the axle when the elongated biasing member passes through the set of guides.

2. The seat suspension system of claim 1, further comprising a handle attached to a first and a second end of the axle, wherein the handle is externally located with respect to the open cavity.

3. The seat suspension system of claim 1, further comprising a linear actuator in mechanical communication with the axle, the linear actuator being controlled by a switch to move the axle in a linear direction, perpendicular to the axle.

4. The seat suspension system of claim 1, further comprising a first resting location of the axle closer to the first end of the elongated biasing member and second resting location of the axle closer to the second end of the elongated biasing member, such that the elongated biasing member includes a greater spring constant when the axle is located at the first resting location closer to the first end of the elongated biasing member than when the axle is located at the second resting location closer to the second end of the elongated biasing member.

5. The seat suspension system of claim 1, further comprising: a first plurality of elongated biasing members and a second plurality of elongated biasing members, wherein the first plurality of elongated biasing members includes each elongated biasing member transversely spaced from one another in a first plane and the second plurality of elongated biasing members includes each elongated biasing member transversely spaced from one another in a second plane, wherein the first plane is not coplanar with the second plane; and at least a portion of the second plurality of elongated biasing members disposed below the first plurality of elongated biasing members.

6. The seat suspension system of claim 5, wherein the first and second plurality of elongated biasing members are each in translational communication with the axle.

7. A seat suspension system, comprising: a seat bottom having at least two separated, parallel walls with an open cavity established therebetween; at least one biasing member disposed within the open cavity, wherein the biasing member further includes: a first end, a second end, and a fixed length extending therebetween; the first end located near one of the walls; an axle disposed in a generally perpendicular relation with respect to the biasing member and secured within the open cavity, the axle adapted to translate in a direction perpendicular to the axle; and the second end of the biasing member in mechanical communication with the axle; and the axle having a first resting location that is closer to the first end of the elongated biasing member and a second resting location of the axle closer to the second end of the elongated biasing member, such that the elongated biasing member includes a greater spring constant when the axle is located at the first resting location closer to the first end of the elongated biasing member than when the axle is located at the second resting location closer to the second end of the elongated biasing member.

8. The seat suspension system of claim 7, wherein the axle includes a first plurality of guides extending in a perpendicular direction, wherein a pair of guides secures one of the first plurality of elongated biasing members to a set location along the length of the axle when one of the first plurality of elongated biasing members passes through the pair of guides.

9. The seat suspension system of claim 8, further comprising: a second plurality of guides extending from the axle in a perpendicular direction, wherein a pair of guides from the second plurality of guides secures one of the second plurality of elongated biasing members to a set location along the length of the axle when one of the second plurality of elongated biasing members passes through the pair of guides; and the pair of guides from the second plurality of guides each including a horizontal translation member, wherein the horizontal translation member is disposed below and in a generally the same plane as the axle, such that the one of the second plurality of elongated biasing members is disposed between the horizontal translation member and the axle and translates across the horizontal translation member.

10. The seat suspension system of claim 7, further comprising a handle attached to a first and a second end of the axle, wherein the handle is externally located with respect to the open cavity.

11. The seat suspension system of claim 7, further comprising a linear actuator in mechanical communication with the axle, the linear actuator being controlled by a switch to move the axle in a linear direction perpendicular to the axle.

12. A seat suspension system, comprising: a seat bottom having at least two separated, parallel walls with an open cavity established therebetween; at least one biasing member disposed within the open cavity, wherein the biasing member further includes: a first end, a second end, and a fixed length extending therebetween; the first end located near one of the walls; an axle disposed in a generally perpendicular relation with respect to the biasing member and secured within the open cavity, the axle adapted to translate with respect to the biasing member in a direction perpendicular to the axle; and the biasing member in mechanical communication with the axle.

13. The seat suspension system of claim 12, further comprising a handle attached to a first and a second end of the axle, wherein the handle is externally located with respect to the open cavity.

14. The seat suspension system of claim 12, further comprising a linear actuator in mechanical communication with the axle, the linear actuator being controlled by a switch to move the axle in a linear direction, perpendicular to the axle.

15. The seat suspension system of claim 12, further comprising a first resting location of the axle closer to the first end of the elongated biasing member and second resting location of the axle closer to the second end of the elongated biasing member, such that the elongated biasing member includes a greater spring constant when the axle is located at the first resting location closer to the first end of the elongated biasing member than when the axle is located at the second resting location closer to the second end of the elongated biasing member.

16. The seat suspension system of claim 12, further comprising: a first plurality of elongated biasing members and a second plurality of elongated biasing members, wherein the first plurality of elongated biasing members includes each elongated biasing member transversely spaced from one another in a first plane and the second plurality of elongated biasing members includes each elongated biasing member transversely spaced from one another in a second plane, wherein the first plane is not coplanar with the second plane; and at least a portion of the second plurality of elongated biasing members disposed below the first plurality of elongated biasing members.

17. The seat suspension system of claim 16, wherein the first and second plurality of elongated biasing members are each in translational communication with the axle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) For a fuller understanding of the invention, reference should be made to the following detailed description, taken in connection with the accompanying drawings, in which:

(2) FIG. 1 is a perspective view of an embodiment of the present invention.

(3) FIG. 2A is a side view of an embodiment of the present invention, highlighting the translatable ability of the axle.

(4) FIG. 2B is a perspective view of an embodiment of the assembly of the axle and the elongated biasing members.

(5) FIG. 3 is a perspective view of an embodiment of the assembly of the axle and the elongated biasing members.

(6) FIG. 4 is a top view of the rear portion of an embodiment of the present invention.

(7) FIG. 5 is a rear perspective view of an embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(8) In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part thereof, and within which are shown by way of illustration specific embodiments by which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the invention.

(9) The present invention is a seat suspension system having an adjustable and/or progressive spring constant for shock mitigation in seat bottoms. Referring now to FIG. 1, an exemplary embodiment of a seat bottom, generally denoted by reference numeral 100, comprises base 102 having four walls extending therefrom to create an open cavity 110. The four walls comprise front wall 104, rear wall 106, and a pair of sidewalls 108.

(10) Open cavity 110 houses a plurality of elongated biasing members 112 extending generally from front wall 104 towards rear wall 106. Each elongated biasing member 112 includes first end 113 and second end 115. First end 113 is secured near front wall 104 using a hinged L-shaped bracket 116 as shown in FIG. 1. First end 113, however, can be secured on or near front wall 104 through any attachment mechanism known to a person of ordinary skill in the art. Second end 115 of each elongated biasing member 112 is in translational communication with axle 114. In an embodiment, elongated biasing members 112 extend between the sidewalls 108, such that first ends 113 are located near one of side walls 108 and second ends 115 are located near the other side wall 108. Either the first or second ends can be attached to an axle or fixed to a structural feature.

(11) Axle 114 further includes a plurality of guides, each denoted by reference numeral 120. Each guide extends in a perpendicular direction with respect to the axle. A pair of guides 120 provides a channel through which an elongated biasing member 112 is disposed. As shown more clearly in FIG. 2B, each elongated biasing member 112 is secured between a pair of guides 120 to fix each elongated biasing member 112 to a set location along the length of axle 114. Axle 114 may include a bearing or roller means between each pair of guides 120 along which each elongated biasing member 112 may easily translate.

(12) Axle 114 is shown as a thin cylindrical object, but it is possible to employ an axle of another shape. In addition, guides 120 may have any shape so long as the guides can maintain the location of an elongated biasing member to an intended location along the length of the axle.

(13) Axle 114 extends between sidewalls 108 near rear wall 106. Axle 114 has a length greater than the distance between sidewalls 108 such that each end of axle 114 extends through and beyond sidewalls 108 in an outboard direction, i.e. away from open cavity 110. Axle 114 includes a handle 118 secured to each end of axle 114 to allow a user to firmly grasp handle 118 and in turn manipulate axle 114.

(14) In an embodiment, axle 114 is in mechanical communication with a linear actuator configured to automatically translate axle 114. The linear actuator includes a remote control or control switch to actuate the linear actuator. In this embodiment, a handle would not be necessary.

(15) Referring now to FIGS. 1 and 2A, sidewalls 108 each include first aperture 122 and second aperture 124 (hidden by handle 118). First aperture 122 and second aperture 124 are connected by channel 126 extending between the two apertures. First apertures 122 are longitudinally spaced with respect to second apertures 124, i.e. in a direction extending along the length of the sidewalls 108, such that first apertures 122 are closer to front wall 104 than second apertures 124. Channel 126 is disposed in each sidewall 108 at a greater height than apertures 122, 124. Apertures 122, 124 act as a notch for receiving axle 114 and handles 118 allow a user to lift and relocate axle 114 between the two apertures as depicted by arrow 125 in FIGS. 2A and 2B. While embodiment 100 includes two apertures 122, 124, any number of apertures may be employed.

(16) The separation between apertures allows axle 114 to effectively alter the length of the elongated biasing members 112, which in turn alters the stiffness of the elongated biasing members 112. When axle 114 is located in the first aperture 122, axle 114 is closer to front wall 104 and elongated biasing members 112 are effectively shorter. Therefore, elongated biasing members 112 have a larger spring constant, i.e. elongated biasing members 112 are stiffer. In contrast, elongated biasing members 112 will have a greater effective length, and thus smaller spring constant, when axle 114 is located in second aperture 124.

(17) As shown most clearly in FIG. 1, each sidewall 108 includes a front straight section 108a, which tapers inwards, towards open cavity 110, through angled portion 108b. Angled portion 108b leads to rear straight portion 108c, which houses apertures 122, 124. Rear straight portions 108c on each sidewall 108 are closer to one another than front straight portions 108a. This configuration allows the overall length of axle 114 and handles 118 to be less than the distance separating front straight portions 108a. As a result, two seat bottoms can be arranged side by side without compromising the adjustability of axle 114. For example, the front side portion 108a of a first seat bottom can abut the front side portion 108a of a second seat bottom and a user would still have access to handles 118 on each seat bottom.

(18) Seat bottom 100 may also include backrest receivers 128 for receiving a backrest attachment member. Backrest receivers 128 include ports 130 passing through back wall 106, which receive the backrest attachment members.

(19) Referring now to FIG. 3, an embodiment includes axle 114 resting on fixed structural member 132 using anti-rotation blocks 134. Fixed structural members 132 are secured to seat base 102 and/or sidewalls 108 and/or back walls 106, and include a flat top wall adapted to mate with a flat bottom wall of anti-rotation block 134. The mating of the two flat surfaces prevents rotation between fixed structural member 132 and anti-rotation block 134. It should be noted that base 102 and vertical walls 104-108 are not illustrated in FIG. 3 to reduce clutter and improve clarity. In an embodiment, fixed structural members 132 may be disposed anywhere in the seat bottom along such that axle 114 and a corresponding anti-rotation block 134 can rest on the fixed structural member 132 when axle 114 is located in a resting position.

(20) As best illustrated in FIG. 4, anti-rotation blocks 134 further includes axle receiving aperture 136 and set screw 138. Axle receiving aperture 136 receives axle 114 and setscrew 138 prevents axle 114 from rotating with respect to anti-rotation block 134. Setscrew 138 may be any mechanism for preventing rotation of the axle with respect to anti-rotation block 134, such as a cottar pin or through bolt.

(21) The embodiment disclosed in FIGS. 3 and 4 further includes a first plurality of elongated biasing members oriented in an upper plane and a second plurality of elongated biasing members oriented in a lower plane. The elongated biasing members oriented in the first plane are individually and collectively denoted by reference numeral 112a, and the elongated biasing members oriented in the second plane are individually and collectively denoted by reference numeral 112b. First plurality of elongated biasing members 112a includes each elongated biasing member 112a transversely spaced from one another in the first plane and second plurality of elongated biasing members 112b includes each elongated biasing member 112b transversely spaced from one another in a second plane.

(22) Because of multiple planes of elongated biasing members, this embodiment offers a progressively increasing spring constant (stiffness) based on the travel conditions and the user's body weight. The overall spring constant of the seat bottom increases as a user's weight overcomes first plurality of elongated biasing members 112a and the seat cushion contacts second plurality of elongated biasing members 112b.

(23) As best shown in FIG. 3, second plurality of elongated biasing members 112b are secured in a lower plane than first plurality of elongated biasing members 112a through trusses 140 extending down from axle 114. Each truss 140 preferably includes two vertical members 142 in connection with axle 114 and horizontal member 144. Vertical members 142 are preferably secured to a specific location along the length of axle 114 using truss collars 146 or another mechanism capable of securing vertical members 142 to a set location along axle 114. Horizontal member 144 may be cylindrical in nature and/or may include a bearing to allow elongated biasing member 112b to slide along horizontal member 144 when a load is applied/removed from elongated biasing member 112b.

(24) Truss collars 146 preferably include setscrews, cottar pins, or through bolts connected to the main axle shaft to prevent the trusses from swinging when a spring pressure is applied to second plurality of elongated biasing members 112b. Further, truss collars 146 and anti-rotation blocks 134 work in tandem to prevent both axle 114 and trusses 140 from rotating and swinging when a spring pressure is applied to second plurality of elongated biasing members 112b.

(25) Vertical members 142 also aid in securing the elongated biasing members 112a to fixed locations along the length of axle 114. An embodiment may include separate guides for each elongated biasing member 112a.

(26) In an embodiment, anti-rotation blocks 134 may be secured to structural member 132 to prevent axle 114 from translating in the fore and aft directions to alter the spring constant of the system. Such an embodiment provides a progressive spring constant by employing several tiers of elongated biasing members. Each tier includes a plurality of elongated biasing members disposed in the same, generally horizontal, plane and the tiers are vertically spaced with respect to each other.

(27) Referring now to FIG. 5, an embodiment includes three structural members 132 for supporting axle 114 when the axle is secured in a resting location. Additional structural members 132 provide greater stability to the system.

(28) The embodiment in FIG. 5 further includes a first plurality of elongated biasing members 112a oriented in an upper plane and a second plurality of elongated biasing members 112b oriented in a lower plane. First plurality of elongated biasing members 112a are disposed in overlying, but vertically spaced relation with respect to second plurality of elongated biasing members 112b, such that each elongated biasing member 112a is vertically aligned with an elongated biasing member 112b. Vertical members 142 from trusses 140 extend above axle 114 to also secure the location of elongated biasing members 112a at the same fixed location along the length of the axle.

(29) In an embodiment, axle 114 may have a crankshaft design, such that trusses 140 are unnecessary in providing second plurality of elongated biasing members 112b a point of contact for second ends 115. Another embodiment may include several tiers of elongated biasing members to create a seat bottom with a multi-tier progressive spring constant. An embodiment may employ several axles at varying heights to create different planes of elongated biasing members. In an embodiment, the seat bottom may employ both a translatable axle and multiple tiers of elongated biasing members.

(30) In an embodiment, elongated biasing members 112a, 112b contact axle 114 at the same height, but are secured near the front wall at two different heights. Essentially, this configuration is the inverse of the configuration shown in FIG. 3, but creates two planes of elongated biasing members and offers a progressively increasing spring constant (stiffness) based on the travel conditions and the user's body weight. The overall spring constant of the seat bottom increases as a user's weight overcomes first plurality of elongated biasing members 112a and the seat cushion contacts second plurality of elongated biasing members 112b.

(31) In an embodiment, the elongated biasing member is a made of a competent composite material or matrix, such as fiberglass. Moreover, the elongated biasing members may have a curved shape, concave towards the bottom of the device. The curved shape increases the spring constant of the elongated biasing members.

(32) An embodiment further includes elongated biasing members with a greater spring constant located near the central longitudinal axis of the seat bottom. Typically, a person's tail bone has a width between 100 mm and 150 mm. Having elongated biasing members with a greater spring constant near the centerline of the seat bottom helps to protect the tail bone. Preferably, the stiffer elongated biasing members would span a lateral distance of at least 100 mm. The stiffness of the elongates biasing members can decrease as the members move away from the centerline of the seat bottom where less support is needed.

Glossary of Claim Terms

(33) Axle: is a support structure extending in generally a horizontal direction to support one or more elongated biasing members.

(34) Elongated: refers to an object being long in relation to its width.

(35) Biasing Member: is a resilient member, reacting as a spring to forces applied to a surface.

(36) Linear or Arched Biasing Member: is a non-helical/non-coiled spring member.

(37) Spring Constant: is a ratio of load to deflection.

(38) Wall: a structural support of any shape, thickness, height, and width.

(39) The advantages set forth above, and those made apparent from the foregoing description, are efficiently attained. Since certain changes may be made in the above construction without departing from the scope of the invention, it is intended that all matters contained in the foregoing description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

(40) It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention that, as a matter of language, might be said to fall therebetween.