Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent
1980-01-25
1981-07-14
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Diaphragm
200283, 200288, 200 83W, H01H 3534
Patent
active
042788579
ABSTRACT:
A pressure-actuated electrical switch assembly is disclosed which includes a member for dampening the vibration experienced by the contact arm of the switch to prevent undesirable fatigue and breakage. The electrical switch is housed within a dome-like container having an entry port that is connected to a hydraulic circuit. The container is divided interiorly by a diaphragm assembly into upper and lower sealed chambers, the upper chamber having the electrical contacts for the switch and the lower chamber receiving fluid pressure through the entry port. A button actuator is fixed to the diaphragm, and it is movable vertically upward in response to fluid pressure in the lower chamber against the underside of the diaphragm which deflects the diaphragm thereby causing the button actuator to engage the cantilevered electrical contact arm which is mounted in the upper chamber. The cantilevered contact arm is bifurcated into two leg portions, a first of the leg portions being engaged by the button actuator which is attached to the diaphragm. The second leg portion extends in a cantilevered fashion above the first leg portion, and a first contact is mounted at the free end of the movable second leg portion directly above a second fixed contact. A finger-like dampening member is attached at its base and along one of its sides to a cap which encloses the upper chamber. The dampening member engages the second leg portion of the cantilevered contact arm to dampen any vibration experienced by the contact arm. In an alternate form, the dampening member is a physical stop that engages the second leg portion adjacent its free end to dampen vibration.
REFERENCES:
patent: 1231561 (1917-07-01), Briggs
patent: 3126466 (1964-03-01), Schwartz
patent: 3161751 (1964-12-01), Pusch
patent: 3302269 (1967-02-01), Cooper
J. I. Case Company
Tolin Gerald P.
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