Seat belt retractor

Patent metadata

Field	Value
Publication number	US-12570233-B2
Application number	US-202418599731-A
Country	US
Kind code	B2
Filing date	Mar 8, 2024
Priority date	Mar 9, 2023
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

A seat belt retractor includes a housing including a pair of side walls facing each other, a winding drum configured to wind up a webbing, the winding drum being housed between the pair of side walls so as to be rotatable in a winding direction and a pull-out direction of the webbing, a lock member provided at a first end portion, of the winding drum, located on one side in an axial direction of the winding drum, a biasing member including one end portion attached to the first end portion of the winding drum, the other end portion attached to the lock member, and a connecting portion connecting the one end portion and the other end portion, a shaft member attached to the first end portion of the winding drum, and a cover member attached to the housing.

First claim

What is claimed is:

1 . A seat belt retractor comprising:
a housing including a pair of side walls facing each other; a winding drum configured to wind up a webbing, the winding drum being housed between the pair of side walls so as to be rotatable in a winding direction and a pull-out direction of the webbing; a lock member provided at a first end portion, of the winding drum, located on one side in an axial direction of the winding drum, the lock member being configured to be movable between: an engagement position in which rotation of the winding drum in the pull-out direction is prevented by the lock member being engaged with the housing or a member attached to the housing; and a non-engagement position in which the rotation of the winding drum in the pull-out direction is allowed, the lock member being moved to the engagement position in an emergency of a vehicle; a biasing member including: one end portion attached to the first end portion of the winding drum; an other end portion attached to the lock member; and a connecting portion connecting the one end portion and the other end portion, the biasing member being configured to bias the lock member to maintain the lock member at the non-engagement position; a shaft member attached to the first end portion of the winding drum, the shaft member including a shaft portion coaxial with the winding drum; and a cover member attached to the housing, the cover member rotatably supporting the shaft portion of the shaft member, wherein the shaft member includes an arm extending, from the shaft portion, outward in a radial direction, the arm is configured to be able to come into contact with the connecting portion of the biasing member from a side opposite to the winding drum, wherein the shaft member includes a hook extending from a distal end of the arm to the other side in the axial direction of the winding drum, and the first end portion of the winding drum is provided with an engagement hole with which the hook is engaged.

2 . The seat belt retractor according to claim 1 , further comprising:
a guide member pivotably supported by the shaft portion of the shaft member, the guide member being configured to move the lock member between the engagement position and the non-engagement position, wherein the lock member includes an operation shaft parallel to the axial direction of the winding drum, the operation shaft being operated by the guide member, the first end portion of the winding drum includes an attachment protrusion protruding from the first end portion to the one side in the axial direction of the winding drum, and the one end portion of the biasing member is attached to the attachment protrusion, and the other end portion of the biasing member is attached to the operation shaft.

3 . The seat belt retractor according to claim 1 ,
wherein the first end portion of the winding drum is provided with a fitting hole opened toward the one side in the axial direction of the winding drum, and the shaft portion of the shaft member is fitted into the fitting hole.

4 . The seat belt retractor according to claim 1 ,
wherein the arm includes an intermediate protrusion protruding from the arm toward the winding drum, and the connecting portion of the biasing member is disposed between the hook and the intermediate protrusion.

5 . The seat belt retractor according to claim 1 ,
wherein a space larger than a thickness of the connecting portion of the biasing member is provided between the first end portion of the winding drum and the arm of the shaft member.

6 . The seat belt retractor according to claim 4 ,
wherein the hook of the shaft member includes a contact portion configured to be able to come into contact with the first end portion of the winding drum in the axial direction of the winding drum, and in a case where the intermediate protrusion of the arm and the contact portion of the hook come into contact with the first end portion of the winding drum, the space in the axial direction of the winding drum between the first end portion of the winding drum and the arm of the shaft member is larger than the thickness, in the axial direction of the winding drum, of the connecting portion of the biasing member.

7 . The seat belt retractor according to claim 1 , further comprising:
a pretensioner including a pretensioner casing attached to the housing, the pretensioner being configured to rotate the winding drum in the winding direction, in the emergency of the vehicle, wherein the lock member is configured to be engaged with the pretensioner casing.

Assignees

• Ashimori Ind Co Ltd

Inventors

• Yokoyama Taro
• Suminaka Satoshi
• Ijiri Takayoshi
• Kurauchi Noriko
• Fujiwara Eri
• HIJIKATA Daiki

Classifications

• B60R22/405

  responsive to belt movement and vehicle movement · CPC title

• B60R2022/468

  characterised by clutching means between actuator and belt reel · CPC title

• B60R22/42 Primary

  having means for acting directly upon the belt, e.g. by clamping or friction {(not combined with the retractor B60R22/185)} · CPC title

• B60R22/36 Primary

  self-locking in an emergency ({B60R22/3405} , B60R22/343 take precedence) · CPC title