Method of making keyboard switches

Details Method of making keyboard switches Method of making keyboard switches

1981-03-06

1983-08-02

Hall, Carl E.

Metal working

Method of mechanical manufacture

Electrical device making

156299, 200 5A, 200 67DA, 200159B, 200340, 264135, 264251, 264254, 26427217, H01H 1100

Patent

active

043958176

ABSTRACT:
A method of making a keyboard including, a number of switch keys fixedly provided on one surface of a resilient plastic sheet a number of moving contacts formed on the other surface of the resilient plastic sheet. The keys are formed of a plastic material having a melting temperature lower than that of the resilient plastic sheet.
Thermoplastic bond layers are deposited on both surfaces of the resilient plastic sheet. The melting point of the thermoplastic bond layers is lower than that of the switch keys.
The resilient plastic sheet is placed in a metal mold which has cavities (101a) at predetermined places.
Melted plastic material is injected into the cavities to form the switch keys and at the same time cause the portions of thermoplastic bond layers which contact the injected melted plastic to be melted by the heat of the injected melted plastic material and to bond the switch keys onto the resilient plastic sheet.

REFERENCES:
patent: 3890679 (1975-06-01), Simon
patent: 4033030 (1977-07-01), Robinson et al.
patent: 4057710 (1977-11-01), Wilmott
patent: 4067102 (1978-01-01), DuRocher et al.
patent: 4131991 (1979-01-01), Riniker
patent: 4311893 (1982-01-01), Tsuchiya et al.

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