Patent ID: 7988172

Claim:
A wheelchair with manual power-supplemented height-adjustable seating, comprising: a lower frame to which drive wheels attach and opposing forwardly extending arms to which front casters attach for rolling movement across a surface; an upper frame that includes a seat and backrest for a person to occupy the wheelchair; a pair of linkage assemblies on opposing sides, each linkage assembly pivotably attached at a first end to the lower frame and at a second end to the upper frame; a pair of actuators, each pivotally attached at a first end to a rear portion of the upper frame and at an opposing end to a pivot attached to a forward portion of the lower frame, extendable between a retracted position and an extended position, and lockable from moving from a selected position, whereby the actuators when unlocked apply a supplemental vertical force in association with a force applied by a user in the wheelchair on the drive wheels for moving the upper frame relative to the lower frame guided by the linkage assembly pivoting in response to the applied forces.