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AUTOMATIC PRESSURE WARNING DEVICE FOR PNEUMATIC UNITS

  • US 3,593,268 A
  • Filed: 12/17/1968
  • Issued: 07/13/1971
  • Est. Priority Date: 12/17/1968
  • Status: Expired due to Term
First Claim
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1. An improved automatic warning device for pneumatic units to identify pressures outside of a predetermined range comprising:

  • a. a housing secured to an outlet from the pneumatic unit providing the device from a signal at all times equivalent with the pressure within the unit;

    b. plunger means within the housing responsive to the pressure within the pneumatic unit, the plunger means having a rod;

    c. compression spring means urging said plunger toward the outlet;

    d. adjustment means within the housing to vary the forces within the spring, said means being adjustably spaced from the plunger means and locating the compression spring therebetween; and

    e. a closure cap assembly detachably secured to the housing;

    f. contact means within the cap assembly, said means including a conducting cup and a second compression spring urging said cup toward the outlet, said cup being movable from a first contact position to a second contact position, the rod of the plunger means engaging the cup to move said cup from the first contact position to a median position without contact, and to the second contact position, depending on the pressure within the pneumatic unit.

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