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:
Apr. 18, 1989
Filed:
Oct. 20, 1983
Ranco Incorporated of Delaware, Dublin, OH (US);
Abstract
A pressostat comprises an operating pressure chamber (4) which is limited by its housing (1) and by an operating membrane (5) or the like including a pressure surface for an output adjustment member (3), at least one spring counteracting the pressure (P) in the operating pressure chamber (4), a switch member (2) which responds when a limit pressure value is exceeded in said working pressure chamber (4), and an enclosed protective chamber (6) arranged concentrically to the working pressure chamber (4) limited by the housing (1), the operating membrane (5) and a protective membrane (7) or the like including pressure surface for the output adjustment member (3). In order, if a fracture of the operating membrane takes place, to ensure switch-off at a substantially lower limit pressure value, there is a first spring (10) counteracting the pressure (P) in the operating pressure chamber (4) arranged outside the operating pressure chamber (4) and the protective chamber (6), and a second spring (9) counteracting the pressure (P) in the operating pressure chamber (4) is arranged within the operating pressure chamber (4), and the pressure surfaces of the two membranes (5, 7) are detachably interconnected via an intermediate member (8) which is firmly connected with one of said pressure surfaces.