Patent · US Expired

Linear drive for a belt tensioner

US6227478A · kind A · utility

8Cited by

6References

9Claims

0Family size

Assignee

TRW Occupant Restraint Systems GmbH & Co. KG · DE

Inventors

Karl Hudelmaier · Alfdorf, DE
Thomas Modinger · Alfdorf, DE
Johannes Schmid · Schwäbisch Gmünd, DE

Key dates

Filing date	Jul 16, 1999
Grant date	May 8, 2001
Priority date	—
Expiry date	Jul 16, 2019

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB60R2022/4661
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A linear drive (10) for a belt tensioner has a cylinder tube (20) comprising at one axial end a face wall (33) provided with an opening (34). A piston (22) is arranged shiftably in the cylinder tube. The piston has a hollow inner space (24). A pyrotechnical propellant charge (28) is provided which following its ignition acts upon the inner space (24) of the piston (22) with compressed gas. To provide a cooling and a filtering function, a pad (44) of a wire conglomerate is arranged within the cylinder tube adjacent the face wall (33) of the cylinder tube.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.