# US 8,783,724 B2 · Gas exhaust device for retractor pretensioner for vehicle

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,783,724 B2
- Document ID: US8783724B2
- Status: Granted
- Kind: B2
- Application number: 13/851,342
- Filed: 2013-03-27
- Published: 2014-04-17
- Granted: 2014-07-22
- Earliest claimed: 2012-10-15
- Assignees: Hyundai Motor Company
- Applicants: Hyundai Motor Company
- Inventors: Hyun Mo Yang
- Web page: https://patentgrep.com/patent/US8783724B2

## CPC

- B60R 22/4633: {Linear actuators, e.g. comprising a piston moving along reel axis and rotating along its own axis}
- C06D 5/00: Generation of pressure gas, e.g. for blasting cartridges, starting cartridges, rockets (explosive compositions containing an oxidizer, fuels for rocket engines intended for reaction with an oxidant other than air C06B)
- B60R 2022/4661: {comprising venting means, e.g. for avoiding overpressure in case of fire or for allowing return motion with energy absorption}
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- C06D: MEANS FOR GENERATING SMOKE OR MIST; GAS-ATTACK COMPOSITIONS; GENERATION OF GAS FOR BLASTING OR PROPULSION (CHEMICAL PART) (fuels C10)

## Abstract

Disclosed herein is a gas exhaust device of a retractor pretensioner for a vehicle, including a pinion connected to a belt weaving spool in a retractor body; a rack linearly transferred when engaged with the pinion; a rack transfer path formed between a pretensioner body and the retractor body, configured to guide the rack linearly toward the pinion; and a micro-gas generator (MGG) mounted on a side of a lower end of the pretensioner body to elevate the rack toward the pinion using gas generated by the MGG, wherein a gas moving aperture is formed to allow communication between an upper portion and a lower portion of the rack transfer path in a longitudinal direction in the rack, to elevate the rack using the gas generated from the MGG and simultaneously, move the rack toward the upper portion of the rack transfer path through the gas moving aperture.

## Claims

### Claim 1

A gas exhaust device of a retractor pretensioner for a vehicle, the gas exhaust device comprising:
a pinion connected to a belt weaving spool in a retractor body;
a rack linearly transferred when engaged with the pinion;
a rack transfer path formed between a pretensioner body and the retractor body, configured to guide the rack linearly toward the pinion; and
a micro-gas generator (MGG) mounted on a side of a lower end of the pretensioner body to elevate the rack toward the pinion using gas generated by the MGG,
wherein a gas moving aperture is formed to allow communication between an upper portion and a lower portion of the rack transfer path in a longitudinal direction in the rack, to elevate the rack using the gas generated from the MGG and simultaneously, move the rack toward the upper portion of the rack transfer path through the gas moving aperture,
wherein a stopper is separably mounted on a top end of the gas moving aperture of the rack to block and release the gas generated by the MGG
wherein the stopper comprises:
an upper body therein with a gas guiding aperture formed eccentrically with respect to the gas moving aperture of the rack; and
a gas sealing end integrally formed on a bottom center portion of the upper body to be inserted in an engaged manner into an upper end of the gas moving aperture.

### Claim 2 (depends on 1)

The gas exhaust device of claim 1, further comprising:
a gas exhaust aperture formed at a top end of the rack moving path is formed to release the gas remaining after exhaustion through the gas moving aperture of the rack and the gas guiding aperture of the stopper.

### Claim 3 (depends on 1)

The gas exhaust device of claim 1, wherein in response to the rack being elevated along the rack transfer path, a fixing protrusion having an inverted triangular cross-section is formed on an inner circumferential portion of the top end of the rack transfer path to automatically separate the stopper from the rack, and a stopping protrusion having a triangular cross-section is formed at an edge of a top surface of the stopper to fix the stopper on the fixing protrusion.