Means for calibrating pressure switches at extra-low pressure se

Details Means for calibrating pressure switches at extra-low pressure se Means for calibrating pressure switches at extra-low pressure se

1978-06-19

1980-02-05

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

200 83S, 200 83SA, 200 83WM, H01H 3534

Patent

active

RE0302074

ABSTRACT:
A simplified calibration mechanism is provided for a pressure switch using an adjustable, spring-biased plunger arrangement for controlling the trip force and hence the pressure to which the switch responds. The mechanism includes an especially configured lever pivoted at one end, contacting an especially shaped cam as a follower at its other end and the plunger at its mid portion. First calibration means are provided in the lever's pivoted end to adjust the normal low-high pressure settings of the switch. Second calibration means are provided to isolate the lever and cam from the plunger for effecting a precise setting of the pressure switch at extra-low pressures.

REFERENCES:
patent: 2375387 (1945-05-01), Robbins
patent: 2919321 (1959-12-01), Lung
patent: 3046368 (1962-07-01), Kaminky
patent: 3600536 (1971-08-01), Kothe
patent: 3789171 (1974-01-01), Kent
patent: 3845265 (1974-10-01), Kothe

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