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. 01, 2002
Filed:
Apr. 06, 2000
Eckart Schuler, Sindelfingen, DE;
Carsten Unruh, Filderstadt-Bernhausen, DE;
Frank Van de Poel, Rottenburg, DE;
DaimlerChrysler AG, Stuttgart, DE;
Abstract
A driving device for a rollover bar for motor vehicles has a piston-cylinder unit that, in a crash situation, extends the rollover bar out of a rest position into a supporting position. A further or second piston-cylinder unit is provided as an additional drive for the purpose of adjusting the first piston-cylinder unit. The influence of the further piston-cylinder unit on the first piston-cylinder unit can be cancelled in the presence of a crash signal. The piston of the first piston-cylinder unit has detent toothing formed on it which acts counter to a retraction movement of the first piston-cylinder unit and with which a controllable detent element is brought into engagement by means of a hydraulic cylinder in any extended position. A piston of the further piston-cylinder unit is held releasably in its retracted position by a controllable locking device. In addition to controlling the detent element, the hydraulic cylinder controls the locking device in such a way that the piston of the further piston-cylinder unit is released in the case of arbitrary extension from its rest position and is otherwise held in the said rest position by the locking device.