Fluid pressure operated switch with piston actuator

Details Fluid pressure operated switch with piston actuator Fluid pressure operated switch with piston actuator

1993-07-22

1995-07-11

Scott, J. R.

Electricity: circuit makers and breakers

Fluid pressure

Piston

H01H 3538

Patent

active

054323100

ABSTRACT:
Pressure switch for moving an electrical contact arrangement including a switch frame supporting fixed contacts and movable contacts, the movable contacts being supported particularly on a contact carrier of the switch frame which is pivoted about a first axis. An intermediate rocking lever is guided on the switch frame and is pivoted about a second axis. A first spring arrangement biases the rocking lever upwardly, and a snap arrangement, containing a torsion coil spring, is interconnected between the rocking lever and the contact carrier. A transmission member, which is moved downwardly by a fluid pressure sensitive piston rod connected thereto, has rollers bearing upon the upper surface of the rocking lever and engages, after a certain downward movement thereof, with a second spring arrangement. When the downward force of the piston rod exceeds the total upward forces of the first spring arrangement, the torsion spring and the second spring arrangement, the rocking lever rotates farther downwardly and, at the limit fluid pressure, the snap arrangement is released to change its force direction thereof which upwardly pivots the contact carrier to open the contact between movable contacts and fixed contacts.

REFERENCES:
patent: 4471182 (1984-09-01), Wielgos et al.
patent: 4752658 (1988-06-01), Mack
patent: 5004873 (1991-04-01), Schnut
patent: 5089673 (1992-02-01), Strzodka

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