Seat belt retractor

Patent metadata

Field	Value
Publication number	US-9688240-B2
Application number	US-201414456555-A
Country	US
Kind code	B2
Filing date	Aug 11, 2014
Priority date	Feb 12, 2013
Publication date	Jun 27, 2017
Grant date	Jun 27, 2017

Abstract

A seat belt retractor instantly switchable between only winding of a webbing to winding and drawing-out of the webbing. Operation member 61 moves from a non-operation position E 1 to an operation position E 2 , and locking mechanism 9 stops rotation of a winding drum in a drawing-out direction “P”. Movement member 70 moves an arrangement member 62 to a first position F 1 or a second position F 2 , and arrangement member 62 arranges the operation member at the non-operation position E 1 or the operation position E 2 . Urging means 63 urges the arrangement member 62 toward the first position F 1 . While winding a webbing 2 , a second maintaining portion 77 of the movement member 70 maintains the arrangement member 62 at the second position F 2 . Release portion 78 of member 70 releases the arrangement member 62 toward a first portion 74 , where the member 62 is kept at the first position F 1.

First claim

What is claimed is:

1. A seat belt retractor comprising:
a winding drum capable of rotating in a winding direction and a drawing-out direction of a webbing;
a locking mechanism that stops only rotation in the drawing-out direction of the winding drum; and
an operation member that moves to a non-operation position, where the locking mechanism is not operated, or an operation position, where the locking mechanism is operated, the seat belt retractor further comprising:
an arrangement member that moves the operation member to thereby arrange the operation member at the non-operation position or the operation position;
a movement member that is rotated by a single revolution by interlocking with and responding to multiple rotations of the winding drum to thereby move the arrangement member to a first position, where the operation member is arranged at the non-operation position, or a second position, where the operation member is arranged at the operation position; and
arrangement member urging means configured to urge the arrangement member toward the first position,
wherein the movement member includes a first maintaining portion to allow the arrangement member at the first position for multiple rotations of the winding drum until a predetermined length of the webbing being drawn out from the winding drum and the movement member rotates a partial revolution, a movement portion continuous to the first maintaining portion and coming in contact with the arrangement member to move the arrangement member from the first position to the second position when winding the webbing onto the winding drum after the predetermined length of the webbing being drawn out from the winding drum, a second maintaining portion continuous to the movement portion and coming in contact with the arrangement member to maintain the arrangement member at the second position while winding the webbing onto the winding drum, a terminal of the second maintaining portion which allows the arrangement member to freely move from the second maintaining portion to the first maintaining portion by the arrangement member urging means without coming in contact with the movement member, before the predetermined length of the webbing being wound onto the winding drum, thereby the arrangement member is moved from the second position to the first position.

2. The seat belt retractor according to claim 1 ,
wherein the movement member includes a changing portion for changing a position of the arrangement member from the first maintaining portion to a movement position to be moved by the movement portion when the predetermined length of the webbing is drawn out from the winding drum.

3. The seat belt retractor according to claim 2 ,
wherein the changing portion of the movement member elastically deforms the arrangement member to thereby change the position of the arrangement member from the first maintaining portion to the movement position to be moved by the movement portion.

4. The seat belt retractor according to claim 2 ,
wherein the changing portion of the movement member is elastically deformed by the arrangement member to thereby change the position of the arrangement member from the first maintaining portion to the movement position to be moved by the movement portion.

5. The seat belt retractor according to claim 1 ,
wherein the movement portion of the movement member includes an inclined portion that inclines toward the second maintaining portion to thereby guide the arrangement member from the first position to the second position by rotation of the movement member.

6. The seat belt retractor according to claim 1 ,
wherein the second maintaining portion of the movement member is formed in a circular-arc shape around an axis line of the winding drum as a center, and outward in a radial direction of the first maintaining portion.

7. The seat belt retractor according to claim 1 , further comprising operation member urging means configured to urge the operation member toward the operation position.

8. The seat belt retractor according to claim 7 ,
wherein the arrangement member urging means and the operation member urging means include one urging member mounted to the arrangement member and the operation member.

9. The seat belt retractor according to claim 1 , further comprising a deceleration mechanism having multiple gears and operative to rotate the movement member at a decelerated speed, with respect to rotation of the winding drum.

10. The seat belt retractor according to claim 1 ,
wherein the locking mechanism includes a ratchet wheel including a plurality of teeth capable of rotating together with the winding drum and a meshing pawl meshing only with the teeth of the ratchet wheel rotating in the drawing-out direction, and operates by meshing the teeth of the ratchet wheel with the meshing pawl; and
wherein the operation member, by its movement to the operation position, arranges the meshing pawl at a position where the meshing pawl is meshed with the teeth of the ratchet wheel, or by its movement to the non operation position, arranges the meshing pawl at a position where the meshing pawl is not meshed with the teeth of the ratchet wheel.

11. The seat belt retractor according to claim 10 , further comprising a displacement mechanism to displace the meshing pawl along the teeth of the ratchet wheel rotating in the winding direction, in a state where the arrangement member is maintained at the second position.

12. The seat belt retractor according to claim 10 ,
wherein the meshing pawl is formed on the operation member.

13. The seat belt retractor according to claim 1 , further comprising rotation means to move the operation member and the arrangement member by rotation.

14. The seat belt retractor according to claim 13 ,
wherein the rotation means includes one rotational shaft to which the operation member and the arrangement member are rotatably mounted.

15. The seat belt retractor according to claim 13 ,
wherein the rotation means includes an operation member rotational shaft to which the operation member is rotatably mounted, and an arrangement member rotational shaft to which the arrangement member is rotatably mounted.

Assignees

• Ashimori Ind Co Ltd

Inventors

• Lee Jongrin
• Kang Young Jae
• MATSUNAGA Tomonari
• Suminaka Satoshi
• Ijiri Takayoshi

Classifications

• B60R22/405 Primary

  responsive to belt movement and vehicle movement · CPC title