Abstract: A wheel assembly for a wheelchair includes a mounting plate fixed on one side of the seat portion, a motor and a gear unit which includes a gear disc, and a gear shaft that extends through the gear disc. The motor includes a driving worm fixed on the motor shaft so as to mesh with the gear disc. The gear disc is formed with an engaging recess. The gear shaft carries a slidable transverse key thereon. A spring biases the gear shaft to engage the key in the recess. A driving gear is fixed on the gear shaft. A driven gear is mounted rotatably on the mounting plate and is fastened to a wheel. A chain interconnects the driving gear and the driven gear. A hand lever can be moved against the bias action of the spring so as to disengage the key from the recess of the gear disc.

Abstract: An artificial foot includes a foot-shaped casing that has an open top, a closed bottom, a toe portion, a heel portion and a positioning projection that is formed in the casing and that extends upwardly from the closed bottom. A flexible muscle member is disposed in the casing and has an upwardly protruding curved intermediate section mounted to the positioning projection, and first front and rear sections that respectively extend from the intermediate section frontwardly and rearwardly into the toe and heel portion. A rigid stop member has a weight bearing section that covers the open top of the casing, a curved bottom part riding on the intermediate section of muscle member, and a second front section that extends downwardly and frontwardly into the toe portion so as dispose the same above the first front section of the muscle member. A second rear section of the stop member extends into the heel portion so as to dispose the same above the second rear section of the muscle member.

Abstract: A wheelchair has a seat portion and a pair of stationary mounting plates fixed to two sides of the seat portion. Each of the mounting plates has a driven pulley rotatably mounted thereon and a driving unit with a driving pulley. An endless belt interconnects the driving and driven pulleys together. A clutch assembly is mounted on the mounting plate and is associated with the driving unit to engage and disengage the driving unit from a pair of wheels that are attached to the stationary mounting plates.

Abstract: A wheelchair includes a foldable seat portion, a pair of stationary plates each of which is provided on each side of the seat portion. Each stationary plate has a shaft that extends outward upon which a wheel is mounted. A driving unit and a gear assembly which connects the driving unit to the wheel are also mounted on the stationary plate. A rechargeable battery unit is used for actuating the driving unit. The wheelchair further has a control switch for operating the driving unit.

Abstract: A covering device for a jointed artificial limb includes a covering layer covering the artificial limb. The covering layer can be made of semirigid PU foam. The covering layer has a screen-like flexible portion adjacent to the joint of the artificial limb. The flexible portion includes a plurality of slits.

Abstract: An adjustment device for artificial limbs includes a hollow cylindrical member having an open upper section and an open bottom end, and a plate member disposed on and covering the open bottom end. A coupling member is received in the hollow cylindrical member and has a top plate portion to cover a central through opening of the plate member, and a downwardly extending post portion projecting from the top plate portion and having a diameter smaller than the central through opening. The post portion extends through the central through opening of the plate member. The hollow cylindrical member is laterally movable to adjust the position of the post portion in the central through opening. The post portion extends into a sleeve member. A mounting member has a cylindrical portion with an upper surface which is provided with a concave recess. The sleeve member is tiltably received in the concave recess so as to guide the post portion in an inclined position relative to a vertical axis of the mounting member.