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    • 36. 发明授权
    • Pressure switch
    • US3555220A
    • 1971-01-12
    • US3555220D
    • 1968-04-08
    • ESSEX INTERNATIONAL INC
    • WOOD CHARLES G
    • H01H35/34H01H35/40
    • H01H35/34
    • A switch responsive to fluid pressure includes a housing constructed of an electrically conductive material and a pair of chambers are formed within the housing separated by a flexible diaphragm. One of the chambers is adapted to be connected to a fluid pressure source and an electrically nonconductive cap seals the end of the other chamber and carries a stationary contact which extends into the other chamber. A resilient disc is disposed in the other chamber adjacent the diaphragm and includes a rim clamped between the housing and the cap, a resilient tab and a movable contact. The resilient tab is responsive to movement of the diaphragm which, in turn, is movable in response to pressure changes in the first chamber, to move the contact surface into and out of electrical contact with the stationary contact. The disc contacts the electrically conductive housing to complete the circuit.