Carl J Poppe

US Patent:

6346681, Feb 12, 2002

Filed:

Sep 28, 1995

Appl. No.:

08/534965

Inventors:

Ronald S. Joyce - Elk Grove Village IL 60007
Carl H. Poppe - Naperville IL 60540
Paul H. Tuma - Lombard IL 60148

International Classification:

H01H 3534

US Classification:

200835, 200 83 R, 200 83 P

Abstract:

A pressure switch having a pressure responsive diaphragm with a backing plate for operating a snap-acting switch. The switch has a cantilevered contact blade spring with an adjustment screw providing a reaction support at the free end. The middle portion of the contact blade spring provides a preload bias against the diaphragm backing plate. The blade spring includes a moveable electrical contact on a tang formed in the middle region and includes an over-center spring for effecting a snap action of the moveable contact against stationary contacts. The actuation-deactuation differential is determined, independently of the pressure setting for switch actuation, by setting the position of the stationary contacts.