Expanding helical ratchet switch

Details Expanding helical ratchet switch Expanding helical ratchet switch

1995-11-20

1996-12-24

Walczak, David J.

Electricity: circuit makers and breakers

Solid contact

Push button operated

200526, 200529, H01H 1962

Patent

active

055866450

ABSTRACT:
A quiet smooth acting push button switch, which permits partial actuation without a change of state, including a body, a cover and a contact cup having one or more tabs, the cup rotatibly mounted on the cover. A plunger, actuator and a ratchet with radially expanding helical camming ramps are mounted in the body, which incrementally rotate the contact cup and tabs upon successive actuations of the switch. Two terminals mounted on the cover are interruptably in contact with the tabs as the tabs are rotated during switch operation. The actuator may be a pawl, bail or a resilient portion of the plunger and has at least one hook for engaging a helical camming surface of the ratchet and rotatibly driving the rachet in response to a depression and release of the plunger.

REFERENCES:
patent: 3223072 (1965-12-01), Bross
patent: 3654413 (1972-04-01), Jorden et al.
patent: 4319106 (1982-03-01), Armitage
patent: 4906808 (1990-03-01), Burgess et al.
patent: 4939320 (1990-07-01), Smith
patent: 5132449 (1992-07-01), Valenzona et al.
patent: 5226529 (1993-07-01), Valenzona

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