Electricity: circuit makers and breakers – Retarded – Dashpot
Patent
1979-08-08
1981-03-17
Truhe, J. V.
Electricity: circuit makers and breakers
Retarded
Dashpot
200 82R, 200160, 267114, H01H 703
Patent
active
042569338
ABSTRACT:
A switching device for preventing prolonged depression-action type activation includes a housing and a depressible plunger mounted in the housing. This plunger includes an upper portion and a lower portion, with the lower portion being movable with respect to the upper portion. The plunger is adapted to be filled with fluid and has a fluid inlet port and a fluid outlet port. An operable stopper valve is associated with the outlet port for maintaining it closed, with the valve being operatively responsive to depression of the plunger for allowing fluid to escape from the plunger. A first spring associated with the lower portion retracts the same inwardly toward the housing when sufficient fluid has escaped from the plunger and while the upper portion is depressed inwardly. A second spring associated with the upper portion urges the same outwardly from the housing when there is no depression force on the upper portion. Fluid is then permitted to re-enter the plunger through the inlet port when the stopper valve closes the outlet port upon removal of the depression force from the upper portion.
REFERENCES:
patent: 3843855 (1974-10-01), Danielson
Ginsburg Morris
Man Bo Inc.
Rodrick Richard J.
Truhe J. V.
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