Electricity: circuit makers and breakers – Fluid pressure – Piston
Patent
1977-11-04
1979-05-01
Tolin, Gerald P.
Electricity: circuit makers and breakers
Fluid pressure
Piston
200 82C, 200 83P, 277165, 74100P, 92168, H01H 3538
Patent
active
041525590
ABSTRACT:
There is shown a pressure responsive device for operating an electric switch plunger, the device having a port to receive fluid under pressure for application to a slidable piston that engages a pressure plate arranged to actuate a snap action disc spring, and thereby actuate the switch plunger via a combination motion doubler and pressure level setting mechanism. Such mechanism includes a yoke member extending from the snap spring to the switch plunger, and a helical spring surrounding the yoke and which at one end engages the pressure plate and at its other end is coupled to an adjustment member that is threaded on a housing that surrounds the helical spring and yoke member. The piston is slidable in a body that has a counterbore transition to the port, and a sealing mechanism is located in the counterbore that includes a metal sleeve that varies in wall thickness such that its outer diameter varies from a maximum at one end to a minimum at its other end, a plastic sleeve that is conformable to the lateral surface of the metal sleeve but which extends past the thinner end of the metal sleeve, and an O-ring captured between the plastic sleeve and surrounding counterbore wall, the O-ring being operable to force the extension of the plastic sleeve against the piston. The O-ring does not engage the piston, and the metal sleeve absorbs the O-ring load that normally would be applied to gripping the piston, thereby eliminating forces that would cause the device to have undesirably high friction and wide deadband, and which would otherwise dictate the use of an undesirably large diameter piston to secure a narrower deadband, lower pressure device.
REFERENCES:
patent: 3300225 (1967-01-01), Shepler
patent: 3335242 (1967-08-01), Johnson
patent: 3393917 (1968-07-01), Kendall
patent: 3535480 (1970-10-01), Bahniuk
Tolin Gerald P.
Turner Perry E.
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