Patent ID: 8512182

Claim:
An automatic transmission device for use in a bicycle comprising: a housing; a torque sensor configured to detect a torque generated by a pedal on the axle of the bicycle; a body strength selector having a plurality of settings configured to vary the rate of change of gear; a slope sensor disposed within the housing, the slope sensor having a weight at a lower end thereof to maintain the position thereof corresponding to the inclination of the housing changing according to the slope on which the housing is disposed on; a front and rear gearshift driving mechanism configured to control a front sprocket assembly and a rear sprocket assembly; the torque sensor is configured to displace a torque variation output ring to control the movement of a tackle; the tackle includes a push arm configured to arrange a pushing shaft at a plurality of orientations controlling the magnitude of the moment of a swing arm such that a receiving shaft is configured to change gear at various rates by rotating a disc for controlling a front sprocket assembly and a disc for controlling a rear sprocket assembly respectively; the slope sensor is configured to such that a catch prevents a rack block from performing any change of gear when the slope value is positive.