Dialling switch for telecommunications set - has distortion to pulses reduced by using stop disc of specified shape

摘要

The dialling switch, for a telecommunications set, has the shape of its stop disc chosen to reduce distortion to the dialling pulses being sent out. The point (4) where the stop spring (3) touches the stop disc (5) lies opposite the point (6) where the pulse-generating contacts (7) touch the pulsing wheel (2). The curved surfaces (10) that join the two flat surfaces (8, 9) of the stop disc have sections of different radii of curvature (r1, r2).