Keyboard switch

Details Keyboard switch Keyboard switch

1988-10-31

1990-07-03

Recla, Henry J.

Electricity: circuit makers and breakers

Solid contact

Membrane type

200341, 4004913, H01H 110

Patent

active

049393278

ABSTRACT:
A keyboard switch for use with a membrane switch array (20) to provide a tactile feeling and, optionally, a click sound comprises a housing (10) which is positioned on the membrane switch array (20). A plunger (13) is reciprocally mounted within the housing (10) and projects outwardly from the housing, the plunger having a cam portion (133). An actuating arm (14) is pivoted to the housing (10) and has a first portion (141) extending beneath the plunger (13) and a second, cam follower portion (142) which engages the cam portion (133) of the plunger (13). The first portion (141) of the actuating arm (14) has a boss (1412) on its surface facing away from the plunger (13) for engaging the switch array (20). A compression spring (15) extends between the plunger (13) and the first portion 141 of the actuating arm (14) to urge the plunger (13) outwardly from the housing (10 ). A leaf spring (16) is mounted to the housing (10) and has a portion (161) which normally engages the plunger (13) whereby when the plunger is depressed into the housing (10) the boss (1412) on the actuating arm actuates the membrane switch and the plunger flexes the leaf spring to a point at which the spring snaps back to a rest position thereby providing a tactile feeling and, in certain cases, a click sound.

REFERENCES:
patent: 3305658 (1967-02-01), Heyhal
patent: 3311731 (1967-03-01), Koepke
patent: 4000389 (1976-12-01), Misson et al.
patent: 4080522 (1978-03-01), Schimmels
patent: 4479040 (1984-10-01), Denley et al.
patent: 4553009 (1985-11-01), Van Zeeland et al.
patent: 4642433 (1987-02-01), Murata

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