Invention Grant
- Patent Title: Force limiting device, belt retractor having a force limiting device, and method for switching over a force limiting device
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Application No.: US13881760Application Date: 2011-08-11
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Publication No.: US09751494B2Publication Date: 2017-09-05
- Inventor: Martin Roehrle
- Applicant: Martin Roehrle
- Applicant Address: DE
- Assignee: TRW Automotive GmbH
- Current Assignee: TRW Automotive GmbH
- Current Assignee Address: DE
- Agency: Tarolli, Sundheim, Covell & Tummino LLP
- Priority: DE102010050696 20101106
- International Application: PCT/EP2011/004023 WO 20110811
- International Announcement: WO2012/059146 WO 20120510
- Main IPC: B60R22/34
- IPC: B60R22/34 ; B60R22/28

Abstract:
A force limiting device for a belt retractor is reversible from a higher restraining force level to a lower restraining force level by means of a reversing means during a force limiting phase, wherein the second restraining force level is largely determined by a performance of at least one force limiting element. The reversing means is arranged so that it accomplishes a significant work share upon reversing which is added to the performance of the force limiting element and thus temporarily increases the restraining force of the force limiting device. In this manner undershooting of the characteristic line of the force limiting device upon reversing to the lower restraining force level is compensated.
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