Air filter gauge
AssigneeTishken Products Co.
InventorRobert P. Redner
Life of this patent
Estimating the term…
Abstract
An air filter cleanness gauge is provided. The gauge in a preferred embodiment includes a transparent cover. The housing has a first opening for fluid communication with the atmosphere and a second opening having fluid communication with a fluid source exposed to a filter. A vane is pivotally connected within the housing and provides a pressure boundary between the first and second openings. Movement of the vane indicates a change in pressure differential between the atmosphere and the fluid source, thereby indicating a need to change the air filter.
Claims19
A fluid filter cleanness gauge comprising:
- a housing with a translucent cover, said housing having a first opening into said housing for fluid communication with a fluid source at a first pressure, said first opening having a variable orifice, and said housing having a second opening spaced away from said first opening, said second opening having fluid communication with a second fluid source exposed to a filter at a second pressure;
- and
- a pivotal vane mounted within said housing providing a pressure boundary between said first and second openings wherein a pressure differential between said first and second pressure sources causes said pivotal vane to pivot to indicate said pressure differential.
A fluid filter cleanness gauge comprising:
- a polymeric housing with a transparent cover, said housing having a first opening for fluid communication with an atmospheric pressure source, said first opening having a variable orifice provided by a threaded fastener mounted within said opening with a head, wherein said head can be moved toward and away said housing to orifice said first opening, and said housing having a second opening spaced away from said first opening, said second opening having fluid communication with a plenum chamber exposed to an air filter, said second opening being connected with a tubular member extending through a pressure boundary;
- a filter member mounted within said housing forming first and second control volumes within said housing between said first and second openings;
- a rigid vane pivotally connected within said housing between said first and second openings having a generally vertical rest position wherein a pressure differential between said atmosphere and said plenum chamber causes said pivotal member to indicate said pressure differential.
An air filter cleanness gauge comprising:
- a plastic housing with a transparent cover, said housing having a first opening for fluid communication with an atmospheric pressure source, said fluid opening having a variable orifice provided by a threaded fastener mounted within said opening with a head, wherein said head can be moved toward and away from said housing to orifice said first opening, and said housing having a second opening spaced away from said first opening, said second opening having fluid communication with a second fluid source at a second pressure source exposed to a filter, said second opening being connected with a tubular member extending through a control volume boundary;
- the indicator markings on said housing for visual communication to an observer at what positions of said pivotal vane a filter replacement is desired;
- a filter member mounted within said housing forming first and second control volumes within said housing between said first and second openings;
- a rigid pivotal vane pivotally connected on a pin mounted within said housing between said first and second openings having a generally vertical rest position wherein a pressure differential between said first and second pressure sources causes said vane to align with said indicator marking on said housing to indicate a need to change said air filter.
Dependencies are inferred from the claim text.