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:
Sep. 16, 2003
Filed:
Dec. 04, 2002
Applicant:
Inventors:
Frank Pechhold, Ludwigsburg, DE;
Arno Marto, Weil der Stadt, DE;
Assignee:
Beru AG, Ludwigsburg, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01H 3/524 ;
U.S. Cl.
CPC ...
H01H 3/524 ;
Abstract
A differential pressure switch having a piston which is guided in a piston housing in a cylinder bore against the force of a return element, the piston head having a pressure P applied to it, while a bore space around its tapered piston shaft has a pressure P applied to it. A switching process is triggered by movement of the piston, the piston tip acting on a switching element and being sealed in relation to the cylinder bore by a rolling diaphragm which is movable within the range of axial movement of the piston.