Method of manufacturing a framed keytop sheet for a push-button

Details Method of manufacturing a framed keytop sheet for a push-button Method of manufacturing a framed keytop sheet for a push-button

1996-03-25

1997-03-25

Walczak, David J.

Electricity: circuit makers and breakers

Solid contact

Membrane type

200517, 29622, H01H 110

Patent

active

056135998

ABSTRACT:
A keytop sheet of a push-button switch includes a keytop made of synthetic resin that is molded on a sheet of resin film. A portion of the film sheet surrounding the portion thereof on which the keytop is molded is provided with a curved projection protruding in a downward and/or upward direction from the surface of the film sheet. Such curved projection can be replaced by providing the portion of the film sheet surrounding the portion thereof on which the keytop is molded with a cut-out to form a hinge portion. A nameplate provided with a hole shaped so that the keytop may be passed therethrough is attached to the film sheet so as to cover the cut-out and hinge portion of the film sheet. The nameplate can have an outer diameter greater than that of the film sheet. A frame made of synthetic resin is fixed to an underside of the film sheet on an outer peripheral portion thereof. An outer peripheral portion of the nameplate is bent and fixed to an outer peripheral side surface of the frame.

REFERENCES:
patent: 4128744 (1978-12-01), Seeger
patent: 4536625 (1985-08-01), Bebie
patent: 4814561 (1989-03-01), Kawasaki
patent: 4839474 (1989-06-01), Hayes-Pankhurst et al.
patent: 4937932 (1990-07-01), Ishii
patent: 4980522 (1990-12-01), Murakami et al.
patent: 5020215 (1991-06-01), Tsai
patent: 5089671 (1992-02-01), Ranetkins

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