Patent ID: 6881913
Filing Date: 2005-04-19
Classification: H01H

Abstract:
1. A pressure switch for monitoring the presence of a pressurized fluid at a predetermined pressure in a pneumatic system, comprising: a switch body; a first pair of contacts disposed at a first end of said switch body; a first stem extending from said switch body at said first end and having a first internal passage for coupling to a source of said predetermined pressure; a first piston slidably received on said first stem and having a first electrically conductive surface at a first piston end for selectably contacting said first pair of contacts; a second pair of contacts disposed at a second end of said switch body; a second stem extending from said switch body at said second end and having a second internal passage for coupling to said source of said predetermined pressure; a second piston slidably received on said second stem and having a second electrically conductive surface at a first piston end for selectably contacting said second pair of contacts; a housing for receiving said switch body and said first and second pistons; a first spring retained between a second piston end of said first piston and said housing; and a second spring retained between a second piston end of said second piston and said housing; whereby when said predetermined pressure is present then pressurized fluid within said first and second internal passages extends said first and second pistons along said first and second stems, respectively, to open said first and second pairs of contacts.