Webbing take-up device

Patent metadata

Field	Value
Publication number	US-9610920-B2
Application number	US-201514669835-A
Country	US
Kind code	B2
Filing date	Mar 26, 2015
Priority date	Apr 1, 2014
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

In a pretensioner mechanism of a webbing take-up device, a sealing member seals a communicating hole of a piston. When a force limiter mechanism is operated and rotating of a spool in a pull-out direction is allowed, the piston is moved to an upper side in a state in which the sealing member is pressed and contacted against a cylinder. As a result, the sealing member is turned and the sealing of the communicating hole by the sealing member is released. In consequence, a number of components may be reduced and assembly characteristics of the pretensioner mechanism may be improved.

First claim

What is claimed is:

1. A webbing take-up device comprising:
a webbing that can be applied to an occupant of a vehicle;
a take-up member onto which the webbing is taken up, by the take-up member being rotated in a take-up direction, the take-up member being rotated in a pull-out direction by the webbing being pulled out;
a moving member in which a communicating hole is provided, the communicating hole communicating between one side and another side of the moving member, and the take-up member being rotated in the take-up direction by the moving member moving toward the one side;
a restricting member that is provided at the communicating hole and restricts communication through the communicating hole;
an accommodating member in which the moving member is accommodated, the moving member being moved to the one side by gas being supplied to the accommodating member at another side of the moving member; and
a force limiter mechanism that allows rotating of the take-up member in the pull-out direction when a load from the occupant that is at least a predetermined load or more acts on the take-up member via the webbing,
wherein, when the force limiter mechanism allows rotating of the take-up member in the pull-out direction, the moving member moves to the another side due to rotating of the take-up member in the pull-out direction in a state in which the restricting member is in contact with the accommodating member, and the restricting member allows communication through the communicating hole, and
wherein, by the moving member being moved to the another side in the state in which the restricting member is in contact with the accommodating member, the restricting member is caused to be turned and allows communication through the communicating hole.

2. The webbing take-up device of claim 1 , wherein the restricting member is compressed between the accommodating member and the moving member by pressure of the gas at the another side of the moving member, whereby allowance of communication through the communicating hole is enabled.

3. The webbing take-up device of claim 1 , wherein the moving member includes a recess, and the restricting member is caused to be turned from the communicating hole into the recess of the moving member to allow communication through the communicating hole.

4. The webbing take-up device of claim 1 , wherein friction forces directly between the restricting member and the accommodation member cause the restricting member to turn.

5. A webbing take-up device comprising:
a webbing that can be applied to an occupant of a vehicle;
a take-up member onto which the webbing is taken up, by the take-up member being rotated in a take-up direction, the take-up member being rotated in a pull-out direction by the webbing being pulled out;
a moving member in which a communicating hole is provided, the communicating hole communicating between one side and another side of the moving member, and the take-up member being rotated in the take-up direction by the moving member moving toward the one side;
a restricting member that is provided at the communicating hole and restricts communication through the communicating hole;
an accommodating member in which the moving member is accommodated, the moving member being moved to the one side by gas being supplied to the accommodating member at another side of the moving member; and
a force limiter mechanism that allows rotating of the take-up member in the pull-out direction when a load from the occupant that is at least a predetermined load or more acts on the take-up member via the webbing,
wherein, when the force limiter mechanism allows rotating of the take-up member in the pull-out direction, the moving member moves to the another side due to rotating of the take-up member in the pull-out direction in a state in which the restricting member is in contact with the accommodating member, and the restricting member allows communication through the communicating hole,
wherein: the communicating hole is opened at: a supply-side of the moving member, at which the gas is supplied, and a facing side of the moving member, at which the moving member faces an inner face of the accommodating member in a state in which the moving member is accommodated in the accommodating member; and the restricting member is able to be in contact with the inner face of the accommodating member at the facing-side,
wherein an accommodating portion is formed at the moving member at the facing side, the accommodating portion communicating through the communicating hole and enabling to accommodate the restricting member, and
wherein, by the moving member being moved to the another side in the state in which the restricting member is in contact with the inner face of the accommodating member, the restricting member is caused to be turned and relatively moved to the accommodating portion side, whereby allows communication through the communicating hole.

Assignees

• Kk Tokai-Rika-Denki-Seisakusho

Inventors

• Yanagawa Wataru
• Miura Kengo
• Miida Kosuke

Classifications

• B60R22/4676

  comprising energy-absorbing means operating between belt reel and retractor frame · CPC title

• B60R22/44

  with means for reducing belt tension during use under normal conditions {(not included in the retractor B60R22/19; B60R22/3405 takes precedence)} · CPC title

• B60R22/3413 Primary

  operating between belt reel and retractor frame (B60R22/4676 takes precedence) · CPC title

• B60R22/4633 Primary

  Linear actuators, e.g. comprising a piston moving along reel axis and rotating along its own axis · CPC title

• B60R2022/4642

  the gas directly propelling a flexible driving means, e.g. a plurality of successive masses, in a tubular chamber · CPC title