Patent ID: 8474470

Claim:
A forearm type of crutch comprising a staff, a ground engaging foot at an operatively lower end of the staff, a forearm support assembly at an operatively upper end of the staff, and a transverse handle, wherein an inclination angle of the forearm support assembly relative to the staff is adjustable by a first indexing portion and a second indexing portion that cooperate with one another, the first indexing portion being stationary relative to the staff and the second indexing portion being stationary relative to the forearm support assembly and wherein the first and second indexing portions have complementarily co-operating zones that are engagable in different angular positions, and a releasable clamping mechanism that clamps the indexing portions in a selected engaged position for use, wherein one of the first and second indexing portions defines a recess for receiving the other of the first and second indexing portion therein, the recess being oversized relative to the other of the first and second indexing portion so as to permit rotation and relative slideable displacement of the indexing portions, the indexing portions being secured against relative rotation and displacement by the releasable clamping mechanism, such that the forearm support assembly is rotatable and displaceable relative to the operatively upper end of the staff when the clamping mechanism is released.