Speedometer for bicycle.

摘要

To eliminate wiring between a speed detector and a speed indicator of a speedometer for a bicycle and accomplish signal transmission between them in radio mode, the speedometer comprises a permanent magnet (3) attached to a wheel (1) of the bicycle; a transmitter (5) attached to a frame (4) that includes a magnetic detector (8), an oscillator (9), and a transmitting coil (11); and a receiver (7) attached to a handlebar (6) that includes a receiving coil (13), an amplifier (14), a computer (17), and an indicator (18). The transmitting coil (11) and the receiving coil (13) are disposed such that their axial lines (p) are in substantial alignment with each other to make magnetic coupling between them reliable. Preferably, the transmitter (5) and/or the receiver (7) is detachably attached.