Keyswitch having bending links

Details Keyswitch having bending links Keyswitch having bending links

Filed on

2005-03-08

Date issued

2005-03-08

Examiner

Friedhofer, Michael A. (Department: 2832)

Patent Class

Electricity: circuit makers and breakers

SubClass

Electric switch details

SubSubClass

Actuators

Type

Reexamination Certificate

Status

active

Patent number

06864449

Description

ABSTRACT:
A keyswitch includes an elastic member for elastically biasing a keytop upward, a base for supporting the elastic member, and a switch circuit which includes stationary contacts and a movable contact for switching states of the switch circuit by vertically operating the keytop. A first link and a second link each include two plates that are hinged so as to be foldable at an intersection as fulcra, and are disposed adjacent each other with a predetermined angle therebetween. In response to the stretching and compression of the elastic member by vertically operating the keytop, the folding angles between the two plates of the first link and the two plates of the second link are variable.

REFERENCES:
patent: 5329084 (1994-07-01), Watanabe et al.
patent: 5823325 (1998-10-01), Lin
patent: 6100482 (2000-08-01), Koma et al.
patent: 6509536 (2003-01-01), Sasaki
patent: 6713699 (2004-03-01), Yoneyama
patent: 6723935 (2004-04-01), Watanabe
patent: 6730868 (2004-05-01), Watanabe
patent: 11-39986 (1999-12-01), None

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