Removable and convertible seat assembly

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.