| 摘要 |
An electric drive unit for vehicles which are normally rider propelled, such as bicycles and tricycles, has a wheel driven by an electric motor for propelling the vehicle by frictional engagement with the front wheel tire. A control lever mounted on the handlebar is manually actuated to exert a pull on a cable which is slidably encased in a flexible sheath which is incapable of contracting. A support for the lever provides a fixed abutment for an upper end of the sheath, so that the motor mounting bracket, against which the lower end of the sheath abuts and which is yieldably supported, is displaced downwardly, by distortion of the sheath, to move the friction wheel into engagement with the vehicle tire. A two post electric switch which is connected to and moves in unison with the motor mounting bracket engages a fixed abutment when it moves downwardly for closing the switch to energize the electric motor carried by said motor bracket, for driving the friction wheel in a direction for rotating the front wheel tire in a forward direction. The yieldable support for the motor bracket raises said bracket to lift the friction wheel out of engagement with the tire and to allow the electric switch to resume a normal open position when the manual pressure applied to the control lever is released.
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