Electrical switching device
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United States of America Patent
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-
Apr 25, 1989
Grant Date -
N/A
app pub date -
Nov 13, 1987
filing date -
Nov 18, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The switching device has a contact arm which is fixed on a shaft in the form of a thick-walled tube and is turnable between a closed position and an open position under the influence of a torsion rod spring. At one of its ends the spring is fixedly connected to the contact arm and at its other end to a percussion hammer. In the closed position the spring is arrested in tensioned condition by means of a latch. When releasing the latch for opening of the switching device, the spring energy is transformed to rotation energy in the hammer and is transferred to the shaft by impact against a projection on the shaft. In this way the contacts of the switching device immediately attain a great separation velocity.
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