Hand-operated accelerator device for an electric-powered bicycle

A hand-operated accelerator device for use in an electric-powered bicycle which includes a handlebar, a sprocket wheel and an electric drive mechanism to drive the sprocket wheel, comprising:

• a handgrip speed controlling actuator adapted to be sleeved on the handlebar so as to be rotatable thereto, said actuator having a right end handgrip portion and a left end portion with an outer circumferential seat;
• a speed controlling signal emitting member including a body which defines an elongated chamber extending in a longitudinal direction, said body having a guiding slot that is opened externally and that extends in said longitudinal direction;
• a shifting member slidably received in said elongated chamber and including two magnets disposed to be spaced apart from each other with an accommodating space in said longitudinal direction, and a protruding member extending outwardly of said guiding slot and moving with said shifting member within said guiding slot;
• a hall-effect generator disposed to extend transversely into said accommodating space so as to generate a voltage signal when said shifting member is driven to move in said longitudinal direction;
• circuit means, connected to said hall-effect generator, for converting said voltage signal into a control signal that is adapted for controlling revolutions of the electric drive mechanism;
• means for transmitting a rotatory movement of said outer circumferential seat to said protruding member so as to drive said shifting member to move in said longitudinal direction;
• and
• means for biasing said shifting member in said longitudinal direction.