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:
Nov. 30, 2004
Filed:
Jan. 13, 2003
Wolfgang Schmid, Langenargen, DE;
ZF Friedrichshafen AG, Friedrichshafen, DE;
Abstract
A parking brake especially for an automotive automatic gearbox or an automotive automated manual gearbox. The parking brake comprises a blocking device that blocks or unblocks the gearbox in response to an actuation signal triggered by an actuation device. The blocking device is brought into the blocking position by actuating a spring accumulator ( ) and the blocking device is released from the blocking position by either hydraulic or pneumatic pressure while simultaneously pretensioning the spring accumulator ( ). The parking brake is further provided with a mechanically actuating locking device ( ) for maintaining the blocking device in the non-blocking condition, and with an electromagnet ( ) that can be supplied with current and that maintains the locking device ( ) in the locking position. The parking brake is further characterized in that the locking device ( ) is mechanically actuated by the blocking device when the blocking position is released and is maintained in the locking position by the electromagnet ( ) that is supplied with current.