# US 10,246,050 B2 · Retractor and seat belt device

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- Number: US 10,246,050 B2
- Document ID: US10246050B2
- Status: Granted
- Kind: B2
- Application number: 15/472,171
- Filed: 2017-03-28
- Published: 2017-10-05
- Granted: 2019-04-02
- Earliest claimed: 2016-03-29
- Assignees: Joyson Safety Systems Japan K.K.
- Applicants: Joyson Safety Systems Japan K.K.
- Inventors: Miguel Pruneda
- Web page: https://patentgrep.com/patent/US10246050B2

## CPC

- B60R 22/38: responsive only to belt movement
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR

## Abstract

A retractor and a seat belt device that can achieve miniaturization of a device by thinning a part of an automatic lock mechanism. The automatic lock mechanism includes a switching plate that is rotatably connected to the spool via a speed reduction gear, and a lever member that is operated by the switching plate. The switching plate includes a disc-shaped guide part, a first projected part disposed on a first surface of the guide part, and a second projected part disposed on a second surface of the guide part. The lever member includes a first lever in contact with the first projected part, a second lever in contact with the second projected part, and a gap disposed between the first lever and the second lever, through which the guide part can pass.

## Claims

### Claim 1

A retractor comprising:
a spool for winding a webbing that restrains an occupant; and
an automatic lock mechanism for locking withdrawal of the webbing, wherein
the automatic lock mechanism comprises a switching plate that is rotatably connected to the spool via a speed reduction mechanism, and a lever member that is operated by the switching plate,
the switching plate comprises a disc-shaped guide part, a first projected part that is disposed on a first surface of the guide part, and a second projected part that is disposed on a second surface of the guide part, and
the lever member comprises a first lever that is in contact with the first projected part, a second lever that is in contact with the second projected part, and a gap that is disposed between the first lever and the second lever, wherein the guide part can pass through the gap.

### Claim 2 (depends on 1)

The retractor according to claim 1, wherein the lever member comprises a locking arm lockable to a part that is synchronously rotated with the spool.

### Claim 3 (depends on 2)

The retractor according to claim 2, wherein either one of the first projected part or the second projected part is disposed at a position wherein the lever member is turned so as to switch to an on-state wherein the locking arm is locked to a part that is synchronously rotated with the spool, and another one of the first projected part and the second projected part is disposed at a position wherein the lever member is turned so as to switch to an off-state wherein the locking arm is separated from the part that is synchronously rotated with the spool.

### Claim 4 (depends on 3)

The retractor according to claim 3, wherein the automatic lock mechanism includes an elastic body for temporarily holding the on-state or the off-state of the lever member.

### Claim 5 (depends on 1)

The retractor according to claim 1, wherein the switching plate includes a first disc part that is coaxially disposed on a first surface of the guide part and has a smaller diameter than the guide part, a second disc part that is coaxially disposed on a second surface of the guide part and has a smaller diameter than the guide part, wherein the first projected part is disposed on a side surface of the first disc part, and the second projected part is disposed on a side surface of the second disc part.

### Claim 6 (depends on 1)

A seat belt device comprising:
a webbing for restraining an occupant;
a retractor for retracting the webbing;
a belt anchor for fixing the webbing on a vehicle body side;
a buckle disposed on a side surface of the seat; and
a tongue disposed in the webbing, wherein
the retractor is the retractor according to claim 1.