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. 07, 2009
Filed:
Apr. 04, 2008
Jakob Lachermeier, Freising, DE;
Jakob Lachermeier, Freising, DE;
Knorr-Bremse Systeme fuer Nutzfahrzeuge GmbH, Munich, DE;
Abstract
A combined service brake and spring-loaded brake cylinder includes an air-bleed valve having a piston supporting a valve body, which is guided inside a cylinder in an axially displaceable manner, and at least one first pressure spring supported on the piston being loaded against a first valve seat on the piston. The piston is loaded by at least one second pressure spring which is supported on the piston rod, in such a manner that the valve body is pushed toward a second valve seat on the piston rod and away from the first valve seat. A first piston area of the piston is loaded by the pressure in the spring chamber in a direction that lifts the valve body from the second valve seat and a second piston area by the pressure inside the service brake chamber in a direction that pushes the valve body toward the second valve seat and lifts it from the first valve seat, whereby a flow connection is established between the service brake chamber and the spring chamber by the valve seat and/or when the valve seat is lifted from the second valve seat.