Abstract: A chuck structure joins a headrest to a wheelchair. A chuck includes a joining hole at an upper end serving to install a supporting arm at two sides of the headrest. The lower end of the chuck includes two sidewalls, on the sidewalls being through holes, with the two sidewall forming a recessed space. Inside the recessed space is an arched end face. The recessed space of the chuck is aligned with and fixed to a bend of the armrest of the wheelchair. A positioning member between the through holes on the sidewalls presses against the bottom of the armrest bend. Two ends of the arched end face press against the upper end of the armrest bend, forming firm positioning effect by three points. The headrest installed on the chuck can be assembled or disassembled by tightening or loosening the positioning member.

Abstract: The invention relates to a chuck structure for joining a headrest to a wheelchair. The chuck comprises a joining hole at an upper end of the chuck, serving to install a supporting arm at two sides of the headrest, at a lower end of the chuck being two sidewalls, on the sidewalls being through holes, the two sidewalls forming a recessed space, inside the space being an arched end face; thereby, the recessed space of the chuck is aligned with and fixed to a bend of the armrest of the wheelchair, with the positioning member between the through holes on the sidewalls pressing against the bottom of the armrest bend, and two ends of the arched end face pressing against the upper end of the armrest bend, forming firm positioning effect by three points, and the headrest installed on the chuck can be assembled or disassembled by tightening or loosening the positioning member.

Abstract: A reclinable wheelchair which allows a user seated therein to adjust the inclination angle of a seat back rest by himself, and is foldable in the width direction. The reclinable wheelchair comprises a frame foldable in the width direction, a seat assembly arranged in the frame, a seat back rest arranged on a back side of the seat assembly of the frame for pivotal movements between an upright position and an inclined position, actuators for driving the seat back rest and capable of holding the seat back rest at an arbitrary position between the upright position and the inclined position, a reclining lever arranged at a position which allows the user to manipulate, for manipulating the actuators, and a head rest attached to the frame. The head rest is comprised of a head rest body, and an attachment coupled to the left and right ends of the frame and folded up on the width direction as the frame is folded.