Limit switch rotary return mechanism

Details Limit switch rotary return mechanism Limit switch rotary return mechanism

1974-10-07

1976-05-25

Rubinson, Gene Z.

Electricity: circuit makers and breakers

Limit switch

200153K, H01H 1918

Patent

active

039596141

ABSTRACT:
An electrical limit switch has a rotary camshaft provided in an operating head which is mounted upon a main switch body which houses electrical switch contacts. Rotational input motion of the camshaft is translated into a linear output motion of an actuator for operating the switch contacts. A minor return spring acts in series with a major return spring upon a flat formed in the camshaft to center the camshaft in a neutral position. The minor return spring is compressed as the camshaft is initially rotated to enable a low torque operation of the shaft until after actuation of the switch contacts, while the major return spring is compressed after switch actuation to provide a principal return force for the camshaft upon its rotary deviation from the neutral position. A spring stop element is inserted between the major and minor springs to limit compression of the minor return spring following an operation of the switch contacts.

REFERENCES:
patent: 2927988 (1960-03-01), Powell
patent: 3512422 (1970-05-01), Aslan
patent: 3749860 (1973-07-01), Crepeau

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