Shock mitigation apparatus
View Patent ↗Described herein is a shock mitigation apparatus. The shock mitigation apparatus may be utilized in a marine environment, able to absorb shocks transmitted to a seat system from a structure to which the seat is affixed. The shock mitigation apparatus includes at least one leaf spring wherein the leaf spring is cantilevered at one end and pivoted at a distal end thereof, and wherein the pivoted end is free to articulate upon flexure of the leaf spring.
1. A shock mitigation apparatus including:
at least one seat member;
a lower mount member configured to securely mount a first end of at least one leaf spring;
an upper mount member attached to the seat member, wherein the upper mount member is configured to securely mount a second end of the at least one leaf spring;
wherein the at least one leaf spring is cantilevered at one end and pivoted at a distal end thereof, and wherein the pivoted end is free to articulate upon flexure of the leaf spring; and
wherein the apparatus includes a pair of lower and upper leaf springs.
2. A shock mitigation apparatus as claimed in claim 1 , wherein the apparatus includes one leaf spring with a stabilizer arm pivotally connected at each end to the lower and upper mount members.
3. A shock mitigation apparatus as claimed in claim 1 , wherein the upper and lower leaf springs are in a substantially parallel arrangement with respect to each other for torsional rigidity.
4. A shock mitigation apparatus as claimed in claim 1 , wherein the pivotal end of the upper leaf spring is mounted to the upper mount member and the pivotal end of the lower leaf spring is mounted to the lower mount member.
5. A shock mitigation apparatus as claimed in claim 1 , wherein at least one of the leaf springs includes a fold or kink at one end of the spring.
6. A shock mitigation apparatus as claimed in claim 5 , wherein the fold or kink is located at one fixed end of the spring.
7. A shock mitigation apparatus as claimed in claim 1 , wherein at least one of the leaf springs includes at least one aperture.
8. A shock mitigation apparatus including:
at least one seat member,
a lower mount member configured to securely mount a first end of at least one leaf spring;
an upper mount member attached to the seat member, wherein the upper mount member is configured to securely mount a second end of the at least one leaf spring;
wherein the at least one leaf spring is cantilevered at one end and pivoted at a distal end thereof, and wherein the pivoted end is free to articulate upon flexure of the leaf spring;
wherein the leaf spring includes at least one aperture; and
wherein the leaf spring includes an aperture that is substantially centrally located therein.
9. A shock mitigation apparatus as claimed in claim 7 , wherein the aperture of at least one of the leaf springs is dimensioned and shaped to tune and control stiffness of the leaf spring for independent control of compliance of three planes of movement and axis of rotation.
10. A shock mitigation apparatus as claimed in claim 1 , wherein the flexure of at least one of the leaf springs is tuned to provide more flex approximately at the pivoted region of the leaf spring for an initial soft spring rate response followed by a progressively firmer spring rate response upon further compression of the leaf spring, thereby avoiding bottoming out of the leaf spring against a stop.
11. A shock mitigation apparatus as claimed in claim 1 , wherein at least one of the leaf springs includes at least one aperture dimensioned and shaped to allow fitment of a damper to pass through the leaf spring, such that the damper is substantially under the center of mass of the seat and absorbs forces while minimizing moments about the apparatus.
12. A shock mitigation apparatus as claimed in claim 1 , wherein at least one of the leaf springs is manufactured out of one of the following materials: plastic, titanium, stainless steel, spring steel or a composite material.
13. A shock mitigation apparatus as claimed in claim 1 , wherein uniform stress is achieved by tapering at least one of the leaf springs so that the gauge of material is greater at its fixed end relative to the distal pivotal end of the leaf spring.
14. A shock mitigation apparatus as claimed in claim 1 , wherein the shock mitigation apparatus includes a visco-elastic or shear-thickening (non-Newtonian) material to provide compression and/or rebound damping.
15. A shock mitigation apparatus as claimed in claim 14 , wherein the visco-elastic material is inserted in a space or void therein between at least one of the leaf springs and a corresponding mount member to provide damping of the downward motion of the apparatus during compression of the leaf springs.
16. A shock mitigation apparatus as claimed in claim 14 , wherein the visco-elastic material may be inserted in a space or void therein between adjacent pairs of the springs to provide damping of upward motion of the apparatus during rebound of the springs.
17. A shock mitigation apparatus as claimed in claim 1 , wherein a pommel design seat extends forward from a back rest to allow an occupant to sit astride and give maximum lateral stability and a firm footing in use.
18. A shock mitigation apparatus as claimed in claim 1 , wherein the seat member includes a swivelling mechanism to enable the seat member to rotate up to 360 degrees with respect to the base assembly.
19. A watercraft including a shock mitigation apparatus as claimed in claim 1 .