Keyboard switch assembly having adhesive position retainer eleme

Details Keyboard switch assembly having adhesive position retainer eleme Keyboard switch assembly having adhesive position retainer eleme

1974-09-12

1977-04-19

Scott, James R.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200159B, 200239, 200275, 200302, H01H 134, H01H 1306

Patent

active

040189996

ABSTRACT:
A keyswitch assembly including a circuit board having a plurality of circuits, each circuit terminating with a pair of first and second contacts, and a curved, resilient contact plate associated with each pair of contacts having at least a portion of its periphery in communication with one of the pair of contacts, the plate being selectively deflectable so that it communicates with the other contact to close the respective circuit. The contact plates are fixed in position by a retaining element comprising a film formed by a layer of thermoplastic material bonded to a flexible sheet of insulative material, the thermoplastic material being bonded to the resilient plates and circuit board thereby maintaining the former in correct position relative to the latter. The method of manufacturing the assembly includes precisely locating the plates over the pairs of contacts, placing the retaining element over the circuit board and applying pressure to the assembly at an elevated temperature for a predetermined time.

REFERENCES:
patent: 3725907 (1973-04-01), Boulanger
patent: 3749859 (1973-07-01), Webb et al.
patent: 3777082 (1973-12-01), Hatley et al.
patent: 3796843 (1974-03-01), Durkee et al.
patent: 3800104 (1974-03-01), Lien et al.
patent: 3806673 (1974-04-01), Boulanger
patent: 3808384 (1974-04-01), Boulanger
patent: 3879586 (1975-04-01), DuRocher et al.
patent: 3886341 (1975-05-01), Forrest
patent: 3941953 (1976-03-01), Misson et al.

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