Keyswitch

Details Keyswitch Keyswitch

1995-09-11

1996-10-08

Walczak, David J.

Electricity: circuit makers and breakers

Electric switch details

Actuators

200517, 200341, H01H 1370

Patent

active

055622038

ABSTRACT:
A keyswitch for a keyboard used with a computer or similar device that has a keytop linked to the base board. A printed circuit board having a contact switch associated with each keytop is associated with the base board. Linking each keytop with the base board is a scissors type guide. A pair of resilient springs are attached to the guide. One of the springs is in continual contact with the base board and: the other spring contacts the contact switch only after the keytop has been depressed a fixed distance thereby closing the contact switch.

REFERENCES:
patent: 3909564 (1975-09-01), Scheingold et al.
patent: 4314113 (1982-02-01), Nelson
patent: 4492838 (1985-01-01), Fukukura
patent: 4560845 (1985-12-01), Takamura et al.
patent: 4580022 (1986-04-01), Oelsch et al.
patent: 4952762 (1990-08-01), Koyanagi
patent: 5256843 (1993-10-01), Chiba et al.
patent: 5280147 (1994-01-01), Mochizuki et al.

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