Switch with device to interlock the switch control if the contac

Details Switch with device to interlock the switch control if the contac Switch with device to interlock the switch control if the contac

1977-07-28

1979-08-21

Pollard, Steven M.

Electricity: circuit makers and breakers

Liquid contact

Time delay

335166, 200337, 200 67B, H01H 300, H01H 2500, H01H 2104

Patent

active

041654536

ABSTRACT:
A switch in which if the contacts of the switch are lightly stuck together the switch control can still separate them, but if the contacts are firmly stuck together then the switch control cannot be moved to the "off" position which would give a dangerously erroneous indication of the state of the circuit switched. A two arm locking lever is pivotally mounted and has a first stop constituted by a spring into which one of the arms penetrates, and a second stop constituted by a pivot axis of the device.

REFERENCES:
patent: 3605052 (1971-09-01), Dimond et al.
patent: 3614685 (1971-10-01), Ellsworth et al.
patent: 3783215 (1974-01-01), Brumfield
patent: 3849747 (1974-11-01), Mrenna et al.

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