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US 4,827,093 AGranted
Adjustable pressure-type switch
AssigneeDeLaval Turbine Inc.
InventorHubert F. Strzodka
Life of this patent
Estimating the term…
Abstract
A pressure switch has a plunger, axially displaceable by the pressure being measured, which enables a contact pin of a microswitch to be actuated. Between the plunger and the contact pin there is arranged a rocker. The microswitch is fastened to the housing of the pressure switch so as to be displaceable in the main extension direction of the rocker. This provides a way to vary the step-up ratio between the plunger motion and the contact-pin motion, whereby the magnitude of the hysteresis of the pressure switch can be varied.
Claims10
A pressure switch comprising:
- a plunger acted upon by the pressure medium to be measured;
- a microswitch having a contact pin, said microswitch being displaceable only in a direction perpendicular to the longitudinal axis of said plunger;
- the movement of said plunger actuating said contact pin by moving the contact pin in the same direction as the movement of the plunger;
- and
- a rocker disposed between said plunger and said contact pin, so that displacement of said microswitch varies the step-up ratio between the displacement of said plunger and the displacement of said contact pin.
2 more elements
A pressure switch comprising:
- a plunger acted upon by the pressure medium to be measured;
- a microswitch having a contact pin, said microswitch being displaceable in a direction perpendicular to the longitudinal axis of said plunger;
- the movement of said plunger actuating said contact pin;
- a rocker disposed between said plunger and said contact pin, so that displacement of said microswitch varies the step-up ratio between the displacement of said plunger and the displacement of said contact pin;
- said microswitch having its back pressing against a wall surface and being connected, by means of at least one fastening screw leading through an elongated hole in the wall surface, to a slide arranged in a hole running in the displacement direction behind the wall surface;
- and
- means for sensitive displacement of the slide when the fastening screw is loosened, said means for sensitive displacement including said slide engaging with a part of its lateral surface into a hole, running transversely with respect to the displacement direction, for the insertion of an adjusting tool.
4 more elements
Dependencies are inferred from the claim text.