Keyboard

Details Keyboard Keyboard

1996-12-09

1998-11-10

Luebke, Renee S.

Electricity: circuit makers and breakers

Multiple circuit control

Multiple switch

200514, 2003021, H02B 128

Patent

active

058347151

ABSTRACT:
A key base plate mounting a membrane sheet with a contact thereon is fixed to a keyboard substrate through a screw. A peripheral edge portion of the key base plate fixed to the keyboard substrate is opposed to a packing fixed to the keyboard substrate. An upper surface of the membrane sheet and the key base plate are covered with an oilproof sheet. A peripheral edge of this sheet is supported between the peripheral edge portion of the key base plate and the packing fixed to the keyboard substrate. When the screw is fastened, the oilproof sheet is pressed with strong force between the peripheral edge portion of the key base plate and the packing fixed to the keyboard substrate.

REFERENCES:
patent: 4352968 (1982-10-01), Pounds
patent: 4980522 (1990-12-01), Murakami et al.
patent: 5089671 (1992-02-01), Ranetkins

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