This invention relates to a variable speed power transmission provided with rotary units which are mounted on an input axis and an output axis in parallel with each other, with a phase angle difference therebetween so as to maintain static balance on the whole.

A stepless transmission device for a bicycle which has sufficient durability and smooth operation characteristics for practical use is provided. The transmission device can steplessly change the rotational ratio of a wheel to a drive sprocket by changing the oscillation angle of rachet arms which are radially disposed on the periphery of a disk fixed to a shaft for said sprocket. The transmission device is characterized in that said rachet arms incorporated with respective crank arms are pivoted...

To produce a wheelchair with high forward-moving efficiency, incorporating a simple structured driving mechanism that is compact enough to be fitted between the wheel and the frame. Thanks to this driving mechanism, the wheelchair moves forward not only when the operation lever is pushed but also when it is pulled. For the less frequent backward movement, the push rim continues to be used. An operation lever 2 is rockably established on each of the left and right sides of the moving direction of...

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 ...

A wheelchair operable with one hand including operation ring, extension arm and interlocking member. The operation ring is attached to a yoke of universal joint that is axially rotatable and installed between the operation ring and one of the driving wheels of the wheelchair. The extension arm is connected to the yoke at its base end and to the interlocking member, that is linked to one of front casters of the wheelchair, at its front end. The oscillation movement of the extension arm that is ma...

A movement converter for use in a combustion engine or as an air compressor wherein reciprocating motion of a piston is converted to rotational motion of an output shaft or a rotational motion of an input shaft is converted to a reciprocating motion of the piston. The movement converter for use in the engine not only attains an improvement in the balance in comparision with conventional reciprocating type engines but allows the mechanical efficiency to be high enough to be placed into practical ...