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:
May. 10, 1994
Filed:
Jan. 11, 1993
Arthur Fohl, Schorndorf, DE;
TRW Repa GmbH, Alfdorf, DE;
Abstract
A belt pretensioner comprising a pyrotechnical piston/cylinder drive has a vehicle-sensitive mass which is formed by a pivotally mounted base (14), a gas generator (18) inserted therein and a piston/cylinder unit (20). To ensure free pivotability of the base (14), the piston (24) is accommodated in the cylinder (22) with axial and radial clearance. The piston (24) is provided with an annular groove (50) in which an annular seal (52) is arranged. When not subjected to the gas pressure from the gas generator, the annular seal (52) is not in contact with the inner wall of the cylinder (22). Under the gas action the annular seal (52) is moved axially along the conically rising bottom (56) of the annular groove (50) and at the same time radially expanded until it comes into sealing engagement with the inner wall of the cylinder (22).