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:
Aug. 17, 2004
Filed:
Oct. 11, 2002
Werner Stumpe, Stuttgart, DE;
Knorr-Bremse Systeme fuer Nutzfahreuge GmbH, Munich, DE;
Abstract
The underlying idea of the invention is to reduce the pressure force resulting from the inlet pressure and the outlet pressure of the back-up valve and affecting the valve body of the back-up valve. The valve body is a switching piston with a first and second switching piston side. The first switching piston side is pressurized by brake operating valve pressure or with brake cylinder pressure and the second switching piston side is pressurized on a first partial surface with brake cylinder pressure and on a second partial surface with brake operating valve pressure. The pressures affecting both sides of the switching piston thus cancel each other out.