# US 9,751,496 B2 · Seat belt tensioner for a vehicle passenger restraint system

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- Number: US 9,751,496 B2
- Document ID: US9751496B2
- Status: Granted
- Kind: B2
- Application number: 14/441,629
- Filed: 2013-11-25
- Published: 2015-10-01
- Granted: 2017-09-05
- Earliest claimed: 2012-11-26
- Assignees: TRW Automotive GmbH
- Applicants: TRW Automotive GmbH
- Inventors: Simon Schreiber; Thomas Moedinger; Alex Waidmann; Karl-Heinz Köeppel; Markus Peters
- Web page: https://patentgrep.com/patent/US9751496B2

## CPC

- B60R 22/4628: {characterised by fluid actuators, e.g. pyrotechnic gas generators (actuating a cable B60R22/4619)}
- B60R 22/1954: {characterised by fluid actuators, e.g. pyrotechnic gas generators (actuating a cable B60R22/1952)}
- F15B 15/19: Pyrotechnical actuators
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

## Abstract

A belt tensioner (10) for a vehicle occupant restraint system comprises a tube (12) containing gas in the trigger case and an igniter unit (14) arranged in the tube (12) which igniter unit is inserted in an open end face (16) of the tube (12) and includes a base (18) and a cap (20) fastened to the base (18) for accommodating a propelling charge, wherein the cap (20) is arranged at least pertly inside the tube. The igniter unit (14) is welded to the tube (12).

## Claims

### Claim 1

A belt tensioner for a vehicle occupant restraint system, comprising:
an igniter unit including an at least partly plastic base and a cap fastened to the base, the can accommodating a propelling charge for producing a pressurized gas;
a metal ring embedded in a plastic part of the base; and
a tube for forwarding the pressurized gas produced by the propelling charge, the ring being welded to the tube to secure the igniter unit to the tube.

### Claim 2 (depends on 1)

The belt tensioner according to claim 1, wherein the cap is arraigned at least partly inside the tube.

### Claim 3 (depends on 1)

The belt tensioner according to claim 1, wherein the base includes a step that extends redialiy outward beyond an inner diameter of the tube.

### Claim 4 (depends on 3)

The belt tensioner according to claim 3, wherein the ring is adjacent the step.

### Claim 5 (depends on 3)

The belt tensioner according to claim 3, wherein the ring is disposed between an open end face of the tube and the step.

### Claim 6 (depends on 1)

The belt tensioner according to claim 1, wherein the metal ring is welded to the tube by frition welding.

### Claim 7 (depends on 1)

The belt tensioner according to claim 1, wherein the metal ring is welded to an open end face of the tube.

### Claim 8 (depends on 1)

The belt. tensioner according to claim 1, wherein the base is at least partly metal.

### Claim 9 (depends on 1)

The belt tensioner according to claim 1 comprising electrical contacts projecting from a rear side of the base.

### Claim 10 (depends on 9)

The belt tensioner according to claim 9, wherein the electrical contacts have ends that axially protrude from the base, the ends being laterally surrounded by a peripheral wail formed by a portion of the base.

### Claim 11 (depends on 1)

the belt tensioner according to claim 1, wherein an outer diameter of the ring is substantially equal to and outer diameter of the tube.