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:
Jan. 06, 2004
Filed:
Apr. 30, 2003
Ludwig Friedsam, Oberdürenbach, DE;
Heinrich Plewnia, Niederhofen, DE;
Gerd Puscher, Anderach, DE;
Peter Schlüter, Kammerforst, DE;
Lucas Automotive GmbH, , DE;
Abstract
A vacuum brake booster ( ) is described, having a vacuum chamber ( ) and a working chamber ( ) separated from one another by a movable wall ( ), and a control valve ( ), which comprises a housing ( ) coupled workingly to the movable wall ( ) and which to achieve a pressure difference at the movable wall ( ) is capable of controlling the supply of atmospheric pressure or above-atmospheric pressure to the working chamber ( ) in dependence upon the displacement of an actuating piston ( ). The vacuum brake booster ( ) has an emergency braking aid comprising a permanent magnet ( ) and an armature ( ), which cooperates with the permanent magnet ( ) and is resiliently biased counter to actuating direction and during an emergency braking operation is drawn into abutment with the permanent magnet ( ), with the result that the control valve ( ) is held open for the supply of atmospheric pressure to the working chamber ( ). The vacuum brake booster ( ) comprises a coupling device ( ) for detachably coupling the armature ( ) to the actuating piston ( ).