Rocking switch actuator for a low force membrane contact switch

Details Rocking switch actuator for a low force membrane contact switch Rocking switch actuator for a low force membrane contact switch

1983-10-03

1985-07-09

Marcus, Stephen

Electricity: circuit makers and breakers

Special application

Liquid or moisture responsive

200 5A, 200159B, 200340, H01H 1330

Patent

active

045284318

ABSTRACT:
A pivoting rocking actuator has a first bottom surface, which comprises two spaced portions, resting on an upper surface of a membrane contact switch assembly when the actuator is in its rest position. The actuator has one end of a buckling spring, which is initially buckled in a selected direction, acting against its upper surface with the other end of the spring acting against a key, which is slidably mounted on a frame, of a keyboard. When the key is depressed, the spring catastrophically buckles in the selected direction to cause initial pivoting of the actuator about a forward edge of each of the spaced portions. This causes a curved bottom surface of the actuator to rotate about a pivot point on the bottom curved surface to close a contact switch of the membrane contact switch assembly. When the key is released, the spring unbuckles at a slower rate than its compression so that there is an initial further rotation of the actuator along the curved bottom surface in the same direction as rotation occurred to close the contact switch. Then, the actuator returns to its rest position to open the contact switch.

REFERENCES:
patent: 4118611 (1978-10-01), Harris
patent: 4479040 (1984-10-01), Denley et al.

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