Measuring and testing – Instrument mechanism or transmission
Patent
1995-05-22
1996-07-09
Noland, Thomas P.
Measuring and testing
Instrument mechanism or transmission
73700, 73741, 116271, G01L 1900
Patent
active
055334148
ABSTRACT:
A coupling device for a pressure gauge includes an upper positioning plate connected spacedly to a lower positioning plate, a sector gear disposed between the lower and upper positioning plates and mounted rotatably thereto, an adjustment plate mounted adjustably on a top side of the sector gear, a push rod with a first end adapted to be in force-transmitting relationship with an actuating unit of a pressure gauge and a second end connected to the adjustment plate, a pinion meshing with the sector gear and to be mounted with an indicator needle of the pressure gauge thereon, a support plate mounted on a bottom side of the lower positioning plate for supporting distal bottom ends of axles of the sector gear and the pinion thereon, and a spiral spring for biasing the pinion to rotate the indicator needle to a starting position. The bottom side of the lower positioning plate, which is made of plastic, is formed with a plurality of resilient, generally L-shaped hook projections which engage the periphery of the support plate, thus mounting the support plate on the lower positioning plate.
REFERENCES:
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patent: 3530720 (1970-09-01), Hurland et al.
patent: 3590641 (1971-07-01), Eggleston
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patent: 3686944 (1972-08-01), Mollick
patent: 3867841 (1975-02-01), Widlund
patent: 4048948 (1977-09-01), Sarasohn
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