Removable and convertible seat assembly

1. A removable or mountable seat assembly, comprising:

a seat back;

a seat pan; and

a locking device in mechanical communication with the seat back and the seat pan and pivotally connecting the seat back to the seat pan via at least one pivot point, wherein the locking device has a locked mode and an unlocked mode,

wherein, when the locking device is in the locked mode, the seat back and seat pan are locked into position relative to one another along at least one common axis of rotation,

wherein, when the locking device is in the unlocked mode, the seat back or the seat pan is unlocked and is able to move freely along the at least one common axis of rotation,

wherein the removable or mountable seat assembly is configured to be removable or mountable from or to a support structure,

wherein the seat back and the seat pan substantially lie along a common plane to form a stretcher and are locked into position relative to one another along the at least one common axis of rotation,

wherein the seat pan is rotated in a forward direction with respect to the seat pan along the at least one common axis of rotation defined as a first angle such that the seat back and the seat pan are at the first angle from one another forming a seat, and

wherein the seat pan is rotated in a backward direction to be folded in a second angle which is reversed from the first angle along the at least one common axis of rotation such that a back surface of the seat pan is substantially flush with a back surface of the seat back in a folded state.

2. A removable or mountable seat assembly, comprising:

a seat back;

a seat pan; and

a locking device in mechanical communication with the seat back and the seat pan and pivotally connecting the seat back to the seat pan via at least one pivot point, wherein the locking device has a locked mode and an unlocked mode,

wherein, when the locking device is in the locked mode, the seat back and seat pan are locked into position relative to one another along at least one common axis of rotation,

wherein, when the locking device is in the unlocked mode, the seat back or the seat pan is unlocked and is able to move freely along the at least one common axis of rotation,

wherein the removable or mountable seat assembly is configured to be removable or mountable from or to a support structure,

wherein the seat back and the seat pan are configured to rotate along the at least one common axis of rotation such that the seat pan and the seat back are able to substantially lie along a common plane to form a stretcher, and the locking device is configured to selectively lock the seat pan and the seat back such that the seat back and the seat pan lie along the common plane forming the stretcher and are locked into position relative to one another along the at least one common axis of rotation,

wherein the seat back and the seat pan are configured to rotate along the at least one common axis of rotation such that the seat pan and the seat back are at a first angle from one another forming a seat, and the locking device is configured to selectively lock the seat pan and the seat back such that the seat back and the seat pan are at the first angle from one another forming the seat and are locked into position relative to one another along the at least one common axis of rotation,

wherein the seat back and the seat pan are configured to rotate along the at least one common axis of rotation such that the seat pan and the seat back are at a second angle from one another forming a folded seat which is reversed from the first angle, and the locking device is configured to selectively lock the seat pan and the seat back such that the seat back and the seat pan are at the second angle from one another forming the folded seat and are locked into position relative to one another along the at least one common axis of rotation, and

wherein the seat pan is rotated in a backward direction to be folded with the second angle such that a back side of the seat pan and a back side of the seat back are faced to each other at the second angle forming the folded seat.

3. The seat assembly of claim 2 , wherein the first angle between the seat pan and the seat back is approximately between 85° and 130° so as to form a chair.

4. The seat assembly of claim 2 , wherein the second angle is between and including 0° and 30°.

5. The seat assembly of claim 2 , wherein the seat pan further comprises an extendable member, the extendable member being configured to extend from the seat pan in a direction opposite from the seat back.

6. The seat assembly of claim 2 , wherein the seat pan further comprises at least one handle located adjacent to a perimeter of the seat pan.

7. The seat assembly of claim 2 , wherein the seat back further comprises at least one interlocking handle located adjacent to a perimeter of the seat back.

8. The seat assembly of claim 2 , further comprising a headrest located adjacent to the seat back, opposite of the seat pan.

9. The seat assembly of claim 8 , wherein the headrest is rotatably connected to the seat back and rotates about a second axis of rotation via at least one pivot.

10. The seat assembly of claim 9 , further comprising a second locking device, the second locking device configured to lock the headrest along relative to the seat back along the second axis of rotation.

11. The seat assembly of claim 9 , further comprising a headrest extension member configured to extend from the headrest opposite of the seat back.

12. The seat assembly of claim 9 , further comprising at least one handle located adjacent to a perimeter of the headrest.

13. The seat assembly of claim 2 , wherein the support structure is a wall.

14. The seat assembly of claim 2 , wherein the support structure is an energy attenuating device.

15. The seat assembly of claim 14 , wherein the energy attenuating device is a rotary energy attenuating device.

16. The seat assembly of claim 2 , wherein the seat back further comprises spaced apart seat back longitudinal members, each of the seat back longitudinal member having a length and opposed first and second ends, and upper and lower transverse members extending between to a first end and a second end of the longitudinal members, respectively.

17. The seat assembly of claim 2 , wherein the seat pan further comprises opposed, spaced apart seat pan longitudinal members, each of the seat pan longitudinal members having a length and opposed first and second ends, and a transverse member extending between to the first end of the seat pan longitudinal members.

18. The seat assembly of claim 2 , further comprising a safety belt configured to retain a person within the seat assembly.

19. The seat assembly of claim 18 , wherein the safety belt is one of a two-point belt restraining system, a three-point belt restraining system, a four-point belt restraining system or a five-point belt restraining system.

20. The seat assembly of claim 18 , wherein the safety belt is a supplemental safety belt that is configured to extend across a width of the seat back so as to retain a person within the seat assembly.

21. The seat assembly of claim 2 , wherein at least one of the seat back and the seat pan is a molded structure.