Adjustable pressure-type switch

• US 4,827,093 A
• Filed: 03/31/1988
• Issued: 05/02/1989
• Est. Priority Date: 03/31/1987
• Status: Expired due to Fees

• Current Assignee: IMO Industries GmbH
• Original Assignee: Delaval Turbine, Inc. (Enovis Corp.)
• Inventors: Strzodka, Hubert F.
• Primary Examiner(s): Tolin, Gerald P.
• Application Number:
  US07/176,270
• Time in Patent Office: 397 Days
• Field of Search: 73/745, 340/611, 340/626, 91/1, 92/5 R, 307/118, 200/81.4, 200/81 R, 200/83 S, 200/83 SA, 200/82 R, 200/82 C, 200/293, 200/294, 200/330, 200/331, 200/335, 200/339, 200/308, 200/83 J
• US Class Current: 200/82.00C
• CPC Class Codes: H01H 35/2628 by varying the relative position of switch-casing and pressure sensitive element
• CPC Class Codes: H01H 35/2635 by adjustment of a motion transmitting system

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.

Claims

1. 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. Pressure switch according to claim 1, wherein the rocker is aligned transversely with respect to the plunger in the displacement direction of the microswitch.

3. Pressure switch according to claim 2, characterized in that the rocker is hinged on a side of the microswitch housing lying in the displacement direction of the rocker.

4. Pressure switch according to claim 1, wherein the microswitch is constructed so as to be displaceable in two opposite directions from a position in which its contact pin is aligned with the plunger.

5. Pressure switch according to claim 1, wherein the microswitch has its back pressing against a wall surface and is 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 that, furthermore, means are provided for sensitive displacement of the slide when the fastening screw is loosened.

6. Pressure switch according to claim 4, wherein the slide engages 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.

7. Pressure switch according to claim 6, wherein the slide is made of a soft material in comparison to that of the adjusting tool, and the adjusting tool has multiple toothing at one end thereof.

8. Pressure switch according to claim 1, wherein the rocker is hinged on a side of the microswitch housing lying in the displacement direction of the rocker.

9. 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.

10. Pressure switch according to claim 9, wherein the slide is made of a soft material in comparison to that of the adjusting tool, and the adjusting tool has multiple toothing at one end thereof which engages the slide.