Electrical transmission or interconnection systems – Switching systems – Plural switches
Patent
1980-11-03
1982-10-12
Shepperd, John W.
Electrical transmission or interconnection systems
Switching systems
Plural switches
200 6177, 200161, 200283, 318446, H01H 1726
Patent
active
043541194
ABSTRACT:
The control station comprises an enclosure having two terminal blocks disposed therein. Each terminal block has a set or normally opened and normally closed contacts which are mechanically interlocked and movable into an open and closed position respectively by an actuating lever. The ground terminals of each set of contacts on each terminal block are electrically interlocked for common connection to an external ground line. The wiring terminals of the normally closed contacts are electrically interlocked to provide a parallel connection through the respective normally closed contacts between an external circuit and the ground line. The terminal of the normally open contact on each terminal block is electrically connected to an external circuit, each proceeding an independent sequence for some controlled device when the contact is closed. Each actuating lever has depending therefrom a shock absorbing elastomeric cord which may be pulled by the operator to close the normally open contact and concurrently open the normally closed contact. Pulling one cord initiates a first sequence of operation and pulling the other cord initiates a second sequence of operation in the equipment being controlled. Pulling both cords at the same time initiates a third sequence of operation in the equipment being controlled. Barrier means are provided to shield the movable levers.
REFERENCES:
patent: 1984921 (1934-12-01), Ehrlich
patent: 2401213 (1946-05-01), Wood
patent: 2636091 (1953-04-01), Carter
patent: 2920151 (1960-01-01), Lawick
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