Snap-action switch

Details Snap-action switch Snap-action switch

1974-09-03

1976-03-02

Harris, G.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Contact-actuating means

335206, 200 67F, H01H 500

Patent

active

039421457

ABSTRACT:
A snap-action switch moves a spring-biased, movable contact against a stationary contact. The switch includes a toroidal permanent magnet mounted loosely on a nonmagnetic, self lubricating plunger. The magnet is normally magnetically attracted to and adjacent to both a keeper and an armature, the armature being fixed to the plunger. The plunger slides through the keeper which also mounts the switch to a keyboard. A finger-engageable button is moved toward the keyboard to store sufficient potential energy in a spring to move the plunger and suddenly break the magnetic attraction, thereby providing a tactile snap-action. Plunger movement moves the movable contact in spring-versus-spring fashion until the contacts engage. Facilities are provided to minimize contact bounce, to maintain the magnet in a preferred position during plunger movement, to ensure self-aligning of the magnet with the keeper and the armature, to minimize contact damage and to optimize the tactile "feel" of the switch.

REFERENCES:
patent: 3175060 (1965-03-01), Crissinger et al.
patent: 3376527 (1968-04-01), Risk
patent: 3458841 (1969-07-01), Davis
patent: 3815066 (1974-06-01), Vinal

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