Electricity: circuit makers and breakers – Interlocking – Between plural switches
Patent
1994-04-08
1995-06-13
Scott, J. R.
Electricity: circuit makers and breakers
Interlocking
Between plural switches
200330, 200337, 361616, H01H 320, H01H 920, H02B 138
Patent
active
054245001
ABSTRACT:
The present invention is for use with high-tension electrical switchgear enclosed within a cabinet. The output shaft of a spring operating mechanism mounted on the exterior of the main safety door extends through the door and is connected to a bell crank. As the shaft rotates the bell crank, it imparts force to a first substantially vertical push rod which in turn imparts force to a second bell crank. An arm of the second bell crank imparts force to a second push rod which is connected to a lever arm that is connected to the operating shaft of the electrical switch, thereby opening or closing the switch. The first push rod has ball joints at both ends and a free twisting joint along the rod, thereby allowing opening of the door without disconnecting the operating mechanism. A push rod connected to the first bell crank engages a lip affixed to the cabinet wall to prevent opening of the door when the switch is closed. A switch detent, rotatably mounted to the interior of the door on an interlock shaft, is spring-biased to engage the first bell crank when the door is open, preventing closing of the switch. When the door is closed, a push rod engages the wall of the cabinet and rotates a lever arm affixed to the interlock shaft, rotating the detent away from the first bell crank, allowing closing of the switch.
REFERENCES:
patent: 2760021 (1956-08-01), Cole et al.
patent: 2946865 (1960-07-01), Thomas
patent: 3179762 (1965-04-01), Swinney
patent: 3229056 (1966-01-01), Turnbull
patent: 3385938 (1968-05-01), Shockelt
patent: 3801765 (1974-04-01), Hodgson
patent: 4107486 (1978-08-01), Evans
patent: 4168417 (1979-09-01), Puetz et al.
patent: 4492831 (1985-01-01), Oakes
patent: 4612424 (1986-09-01), Clark et al.
Electro-Mechanical Corporation
Scott J. R.
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