Lever-operated type of wheelchair

Claim 1

A lever-operated wheelchair comprising: a wheelchair frame; a single operational lever; a differential link mechamism coupled to said lever, said link mechanism comprising: a driving yoke coupled at one end to a base part of said single operational lever; a frame pin provided on and extending from a side face of said frame; a crossed bearing for loosely couupling another end of said driving yoke to said frame pin; a crossed shaft having a middle point connected to said end of said driving yoke; a pair of joint yokes, one end of each yoke coupled to an end of said crossed shaft; and a pair of longitudinally arranged torque rods, one end of each torque rod coupled to another end of said joint yoke; and a pair of forward/backward clutch mechanisms comprising: a hub shaft coupled to brackets on said frame; clutch hubs provided on said hub shaft; moving arms pivotally coupled to said hub shaft, one end of said moving arms being coupled to another end of said torque rods; holes provided in another end of said moving arms; release drums fixed to one of said brackets of said frame; releases coupled to said release drums; an outer spring provided in said clutch hubs; an inner spring provided in said clutch hubs; projections formed on one end of said inner and outer springs inserted into said holes in said moving arm; and projections formed on another end of said inner and outer springs coupled to said releases; whereby operation of said single lever of said differential link mechanism operates said pair of clutch mechanisms.