Lever-operated type of wheelchair
OwnerAkira Korosueinventor
Life of this patent
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Abstract
A lever-operating type wheelchair includes a differential link mechanism connected to an operational lever, a pair of forward/backward clutch mechanisms driven to interlock with the link mechanism, and an expansion joint mechanism provided between the link mechanism and one of the clutch mechanisms. The lever-operated type wheelchair of this invention has better operational capability in use for one-handed operation due to a fulcrum and a knob of the operational lever arranged so as to make the operation thereof easier.
Claims2
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.
A lever-operated type wheelchair according to claim 3, characterized in that said torque rod ends are coupled to said moving arms through an expansion joint mechanism.
Dependencies are inferred from the claim text.