The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 1984
Filed:
Oct. 13, 1981
James R Johnson, Johnson County, KS (US);
Sor, Inc., Olathe, KS (US);
Abstract
A pressure switch device having a fire resistant welded assembly of corrosion resistant steel components exposed to the fluid medium which is being monitored. A flexible diaphragm constructed of corrosion resistant steel film is overlaid by a backing disc and backing ring both formed of corrosion resistant steel. Inside the backing ring is an elastomer disc which receives a stainless steel piston that moves up and down in response to changes in the fluid pressure applied to the diaphragm through a pressure port. The piston has a shaft which actuates an electrical switch in response to changes in the pressure of the fluid medium. The periphery of the diaphragm is secured by a pressure tight weld to the housing, the upper corrosion resistant steel disc and the backing ring to provide a fire resistant assembly which confines the pressure medium in the event of a fire.