Importance

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Abstract

A calling device usable in telephone subscribers' instruments to selectively close a set of contacts upon the depression of one of a plurality of upwardly biased pushbuttons. The device is adapted to be assembled modularly and includes an integrated switching module arranged as an unitary assembly. A plurality of one piece spring and contact members within the switching module serve to restore each pushbutton and provide a single 'make' contact with an included contact strip whenever an individual pushbutton is depressed. Formed wiper contact ends of each spring and contact member and contact strip, electrically connect to a circuit board which is disposed to engage a rear face of the switching module. The front face accepts a faceplate and pushbutton assembly which is keyed to the switching module and is easily removed and replaced without disassembling the entire calling device.

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First Claim