Patent ID: 7490904

Claim:
A shear force reducer: a seat plate having a top surface, a bottom surface a distal end and a proximal end, at the proximal end is an offset unit that protrudes from the bottom surface; a back plate having a top surface, a bottom surface, a distal end and a proximal end, and at the back plate's distal end is pivotally interconnected to the seat plate at the offset unit; a seat transition plate having a distal end and a proximal end; a back transition plate having a distal end and a proximal end a sliding seat plate (a) positioned over the seat plate, (b) has a proximal end that is pivotally interconnected to a seat transition plate's distal end; the seat transition plate's proximal end is pivotally interconnected to the back plate's top surface; a sliding back plate (a) positioned over the back plate and (b) has a distal end that is pivotally interconnected to a back transition plate's proximal end; the back transition plate's distal end is pivotally interconnected to the seat plate's bottom surface and positioned within the back transition plate opening when the shear force reducer is in a supine position.