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:
Jul. 14, 2009
Filed:
Nov. 19, 2004
Joerg Haffelder, Bad Rappenau, DE;
Dieter Blattert, Kirchheim/Neckar, DE;
Guenther Hertlein, Fichtenberg, DE;
Frank Baehrle-miller, Schoenaich, DE;
Joerg Haffelder, Bad Rappenau, DE;
Dieter Blattert, Kirchheim/Neckar, DE;
Guenther Hertlein, Fichtenberg, DE;
Frank Baehrle-Miller, Schoenaich, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The present invention relates to an automatic parking brake, including a brake piston, an auxiliary piston, a hydraulic chamber disposed between the brake piston and the auxiliary piston, a spring element, for prestressing the auxiliary piston, a spindle device connected to the auxiliary piston via a threaded connection, and a drive for the spindle device, wherein in a locked state of the parking brake, the brake piston is mechanically locked via the spindle device and the spring-loaded auxiliary piston, and in a released state of the parking brake, the auxiliary piston is blocked by means of the spring element and/or by means of the spindle device.