Pushbutton call transmitter

Details Pushbutton call transmitter Pushbutton call transmitter

1978-12-29

1980-03-11

Brigance, Gerald

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340365S, 200 5A, 200159A, H04M 150

Patent

active

041929764

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.

REFERENCES:
patent: 3800104 (1974-03-01), Lien et al.
patent: 3870840 (1975-03-01), Rivetta et al.
patent: 3909564 (1975-09-01), Scheingold et al.
patent: 4005293 (1977-01-01), Boulanger
patent: 4059737 (1977-11-01), Gergaub
patent: 4074088 (1978-02-01), Kedugh et al.
patent: 4129763 (1978-12-01), Murata

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