Gauge with indicator switch
AssigneeGraco Inc.
InventorsEdward P. Murphy, Dennis Balogh
Life of this patent
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Abstract
A pressure gauge and indicator switch wherein a Bourdon tube and electrical switch are sealably contained within a liquid-filled compartment, and a liquid pathway is provided between the Bourdon tube and an external fitting. The electrical switch leads are connectable outside the compartment, and the Bourdon tube is mechanically linked to a pressure indicator so as to provide an analog reading of actual pressure within the Bourdon tube, and the Bourdon tube is mechanically linked to the pressure switch so as to provide a switch actuation whenever the pressure within the Bourdon tube reaches a predetermined level.
Claims8
A pressure gauge and indicator apparatus, comprising:
- a) a housing and a cover threadably attached to said housing to form a sealable compartment therebetween, said cover having a transparent window;
- b) a Bourdon tube mounted to said housing in said compartment, said tube having a sealed end in said compartment and having an open end coupled to a liquid passage;
- c) a fitting sealably mounted to said housing outside said compartment, said fitting having means for holding a diaphragm closure proximate an end and having passages coupled to said liquid passage;
- d) a rotatable shaft mounted to said housing in said compartment, said shaft having a forward end connected to an indicator needle and having a gear affixed along the length of said shaft;
- e) a pivotable gear plate mounted to said housing in said compartment, said plate having an edge with teeth engageable with said gear and having a mechanical linkage to said sealed end of the Bourdon tube;
- f) an electrical switch mounted to said housing in said compartment, said switch having an actuator proximate said sealed end of said Bourdon tube, and electrical conductors connected to said switch;
- and
- g) a connector plug on said housing, said connector plug having means in said compartment for connecting to said electrical conductors and means outside said compartment for providing electrical contact with said conductors outside said compartment.
Dependencies are inferred from the claim text.