Electricity: circuit makers and breakers – Plural switches control single circuit
Patent
1978-07-10
1980-07-01
Schmidt, Frederick R.
Electricity: circuit makers and breakers
Plural switches control single circuit
74527, 200 44, 200320, 200334, H01H 928
Patent
active
042107881
ABSTRACT:
A manually operated handle assembly for operating high voltage circuit interrupter devices which are suitable for circuit opening operations but which are not suitable for circuit closing operations. Interrupter devices for which the handle assembly embodied in the present invention is suitable, therefore, are intended to be used in conjunction with a disconnect switch that is suitable for circuit-closing operations. By removing a lock bar, which unless removed prevents movement of the operating handle, and raising the operating handle to the horizontal position, the operating handle can be pivoted to rotate an operating shaft which causes the interrupter device to trip open. Closing the interrupter device is accomplished by pivoting the operating handle farther and thereby rotating the operating shaft an additional amount. The handle assembly provides an interlock feature which prevents the interrupter device being operated by the handle from being inadvertently closed unless the associated disconnect switch is open. However, the interlock feature does not interfere with operation of the handle assembly to cause the interrupter device to trip open. The interlock feature of the disclosed invention incorporates a key operated locking mechanism which prevents operation of the handle to complete the closing of the interrupter device unless an associated disconnect switch has been opened and locked in the open position. The operating handle is held in a horizontal position except when it is rotated to the "home" position, thereby providing a visual indication when the interrupter device is not in the "home" position.
REFERENCES:
patent: 1370501 (1921-03-01), Knudsen
patent: 2547153 (1951-04-01), Caswell
patent: 2950363 (1960-08-01), Bachman et al.
patent: 3022391 (1962-02-01), Oravec
patent: 3213213 (1965-10-01), De Smidt
Kaufmann John D.
S&C Electric Company
Schmidt Frederick R.
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