WEBBING TAKE-UP DEVICE

• US 20160311398A1
• Filed: 04/21/2016
• Published: 10/27/2016
• Est. Priority Date: 04/24/2015
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Original Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Inventors: OSAKI, Takahiro, UMAKOSHI, Tomonari, NAGATA, Yuya, SAITO, Takuhiro
• Granted Patent: US 10,005,424 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60R 2022/4453 the additional retraction device being a second spring
• CPC Class Codes: B60R 2022/4466 the additional retraction device being an electric actuator
• CPC Class Codes: B60R 2022/4666 characterised by electric actuators
• CPC Class Codes: B60R 2022/468 characterised by clutching means between actuator and belt reel
• CPC Class Codes: B60R 22/44 with means for reducing belt tension during use under normal conditions not included in the retractor B60R22/19; B60R22/3405 takes precedence
• CPC Class Codes: B60R 22/46 Reels with means to tension the belt in an emergency by forced winding upelectrical circuits for triggering safety arrangements B60R21/01 ; tensioners using reels only guiding the belt during normal use, e.g. splitted reels B60R22/195

Abstract

A webbing take-up device includes a second clutch that transmits rotation of a motor to a spool. The second clutch includes a base including a first spring catch portion, a clutch gear, a clutch spring including a coil portion, having an end portion at one side caught to the first spring catch portion, and a lever that includes a second spring catch portion catching an end portion at another side of the clutch spring, and that enlarges diameter of the coil portion to abut the clutch gear by moving the end portion at the another side of the clutch spring toward one side in the circumferential direction of the base. A terminal end of the end portion at the one side of the clutch spring abuts the first spring catch portion when the lever is rotated toward the one side in the circumferential direction of the base.

Claims

1. A webbing take-up device comprising:

a spool that takes up a webbing that is to be worn by an occupant;

a first rotating body that includes a first spring catch portion;

a second rotating body that is provided so as to be capable of rotating integrally with the spool, and that rotates due to rotation of the first rotating body being transmitted to the second rotating body;

a spring that is provided between the first rotating body and the second rotating body, and that includes a coil portion wound into a ring shape along an outer circumferential portion of the first rotating body, an end portion at one side of the spring being caught at the first spring catch portion; and

a lever that is capable of rotating in a circumferential direction of the first rotating body, that includes a second spring catch portion to which an end portion at another side of the spring is caught, and that enlarges a diameter of the coil portion by moving the end portion at the another side of the spring toward one side in the circumferential direction of the first rotating body in a case in which the lever is rotated toward the one side in the circumferential direction of the first rotating body so as to transmit rotation of the first rotating body to the second rotating body via the coil portion,

wherein, in a case in which the lever is rotated toward the one side in the circumferential direction of the first rotating body, at least one of a terminal end of the end portion at the one side of the spring or a terminal end of the end portion at the another side of the spring abuts either the first spring catch portion or the second spring catch portion.

3. The webbing take-up device of claim 1, wherein the end portion at the one side of the spring abuts the first spring catch portion when the lever is rotated toward the one side in the circumferential direction of the first rotating body.

5. The webbing take-up device of claim 1, wherein, in a state in which the diameter of the coil portion has been enlarged, the second rotating body rotates the lever toward another side in the circumferential direction of the first rotating body via the coil portion of the spring and the end portion at the another side of the spring, due to the webbing being pulled with greater than a specific tensile force.

7. The webbing take-up device of claim 3, wherein, in a state in which the diameter of the coil portion has been enlarged, the second rotating body rotates the lever toward another side in the circumferential direction of the first rotating body via the coil portion of the spring and the end portion at the another side of the spring, due to the webbing being pulled with greater than a specific tensile force.

9. The webbing take-up device of claim 3, wherein:

the first spring catch portion is one of a groove portion or a hole portion, which extends from an outer circumference side of the first rotating body toward an inner side of the first rotating body, an end portion at the outer circumference side of the first spring catch portion being opened, and an end portion at the inner side being formed with a wall portion; and

the terminal end of the end portion at the one side of the spring abuts the wall portion when the lever is rotated toward the one side in the circumferential direction of the first rotating body.

2. A webbing take-up device comprising:

a spool that takes up a webbing that is to be worn by an occupant;

a first rotating body that includes a first spring catch portion;

a second rotating body that is provided so as to be capable of rotating integrally with the spool, and that rotates due to rotation of the first rotating body being transmitted to the second rotating body;

a spring that is provided between the first rotating body and the second rotating body, and that includes a coil portion wound into a ring shape along an outer circumferential portion of the first rotating body, an end portion at one side of the spring being caught at the first spring catch portion; and

a lever that is capable of rotating in a circumferential direction of the first rotating body, that includes a second spring catch portion to which an end portion at another side of the spring is caught, that enlarges a diameter of the coil portion by moving the end portion at the another side of the spring toward one side in the circumferential direction of the first rotating body in a case in which the lever is rotated toward the one side in the circumferential direction of the first rotating body so as to transmit rotation of the first rotating body to the second rotating body via the coil portion,

wherein, in a case in which the lever is rotated toward the one side in the circumferential direction of the first rotating body, at least one of the end portion at the one side of the spring or the end portion at the another side of the spring moves while remaining caught at either the first spring catch portion or the second spring catch portion.

4. The webbing take-up device of claim 2, wherein the end portion at the one side of the spring moves while remaining caught at the first spring catch portion when the lever is rotated toward the one side in the circumferential direction of the first rotating body.

6. The webbing take-up device of claim 2, wherein, in a state in which the diameter of the coil portion has been enlarged, the second rotating body rotates the lever toward another side in the circumferential direction of the first rotating body via the coil portion of the spring and the end portion at the another side of the spring, due to the webbing being pulled with greater than a specific tensile force.

8. The webbing take-up device of claim 4, wherein, in a state in which the diameter of the coil portion has been enlarged, the second rotating body rotates the lever toward another side in the circumferential direction of the first rotating body via the coil portion of the spring and the end portion at the another side of the spring, due to the webbing being pulled with greater than a specific tensile force.

10. The webbing take-up device of claim 4, wherein:

the first spring catch portion is a hole portion which extends in a direction of an axis of rotation of the first rotating body; and

the end portion at the one side of the spring moves inside the hole portion while remaining disposed inside the hole portion when the lever is rotated toward the one side in the circumferential direction of the first rotating body.