Filter change indicator
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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Abstract
A fluid system pressure indicator is adapted for use in fluid systems having a filter element. The fluid system force indicator includes a housing partitioned to be exposed to the fluid system to provide transmission of a mechanical force between these partitioned environments to indicate the fluid pressure. This exterior shape change is such that it can be identified through tactile means not requiring visual identification.
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Citations
20 Claims
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1. A fluid system/pressure indicator combination comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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7. A one piece component for response to a pressure differential comprising a plastic diaphragm and a plastic shaft axially projecting integrally from a central location of said diaphragm wherein said diaphragm has a pre-established flexure characteristic which results in a dampened displacement of said shaft in response to a pressure of said shaft in response to a pressure differential exerted against said diaphragm.
Specification