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Filter change indicator

  • US 7,360,433 B2
  • Filed: 11/17/2006
  • Issued: 04/22/2008
  • Est. Priority Date: 08/31/2004
  • Status: Expired due to Fees
First Claim
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1. A fluid system/pressure indicator combination comprising:

  • a fluid system having a fluid pathway extending between a fluid pump and a filter element;

    a housing having an interior fluid portion in fluid communication with the fluid pathway, said housing having a cover with an opening;

    an axially displaceable pressure communicator having an actuator within the housing, said communicator being at least partially in fluid contact with the fluid system;

    a fluid diaphragm fluidly separating the actuator from the fluid system;

    an indicator spring exerting an axial pressure on the pressure communicator;

    a projectable indicator having an actuator engagement surface and at least one portion which is projectable through the opening to an exterior of the housing; and

    said indicator spring exerting a biasing pressure on the indicator such that when the projectable actuator and actuator engagement surface are not in engagement, a portion of the projectable indicator is projected through the opening to an exterior of the housing.

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