Pushbutton dial for telephones etc. - has spring-loaded buttons with shanks acting on spring contacts at base and heads displaced in slots

摘要

The push-button dialling device, for telephones, etc., has guide sleeves (15,16) with hooked ends (17) mounted on the underside of the cover plate. Pushbutton heads (50,56) fit into these sleeves and can be displaced by means of slots (53) in switching pins (52) under the action of springs (60). he springs rest against the underside of the heads and on the top surfaces of the sleeves' shoulders. The cover plate fixes to a chassis (40) which the operating ends (54) of the switching pins face and act on spring contacts on that chassis.