Thin keyboard switch

Details Thin keyboard switch Thin keyboard switch

1993-12-17

1995-03-07

Luebke, Renee S.

Electricity: circuit makers and breakers

Solid contact

Membrane type

200344, 200345, H01H 312

Patent

active

053960386

ABSTRACT:
A key stem of a keyboard switch includes an outer slide and an inner slide. When a key top is struck, the outer slide slides inside of an outer guide, and the inner slide slides inside an inner guide. A first moment point is developed between the outer slide and the outer guide, while a second moment point is developed between the inner slide and the inner guide. A taper at the bottom of the outer slide prevents the second moment point being developed in that location. The reduced horizontal distance between the two moment points helps prevent binding of the key when an actuating force is applied off the axis of the key top. A relationship is disclosed for avoiding sticking or binding in which the horizontal distance between the two moment points, times a coefficient of friction, is less than the vertical distance between the planes of the two moment points.

REFERENCES:
patent: 3367206 (1968-02-01), Moody
patent: 4556769 (1985-12-01), Inaba
patent: 5120923 (1992-06-01), Kato et al.
patent: 5145058 (1992-09-01), Lee

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