Brake device for vehicle seat

Patent metadata

Field	Value
Publication number	US-12459406-B2
Application number	US-202218085907-A
Country	US
Kind code	B2
Filing date	Dec 21, 2022
Priority date	Feb 21, 2022
Publication date	Nov 4, 2025
Grant date	Nov 4, 2025

Abstract

A brake device for a vehicle seat, which includes a tooth plate installed on an unlock member and coupled to a pinion shaft in a serration manner to constrain rotation of the pinion shaft. Therefore, even when the rotational constraint force by brake rollers is reduced due to the repeated loading, the rotation of the pinion shaft is reliably suppressed by the tooth plate, thereby preventing seat sagging.

First claim

What is claimed is:

1 . A brake device for a vehicle seat comprising:
an input member connected to a lever to be operated by an occupant and rotating according to operation of the lever; an unlock member configured to be pushed and moved in an axial direction by rotation of the input member; a housing, the input member and the unlock member being installed on one side of the housing; a brake ring mounted on the other side of the housing; a pinion shaft rotatably installed in the housing through the brake ring; a brake member installed between the brake ring and the pinion shaft and constraining the pinion shaft with respect to the brake ring or releasing constraint of the pinion shaft; and a tooth plate installed in the unlock member and constraining rotation of the pinion shaft.

2 . The brake device of claim 1 , wherein teeth formed on an inner peripheral surface of the tooth plate are engaged with teeth formed on one end of the pinion shaft.

3 . The brake device of claim 2 , wherein the teeth of the tooth plate and the teeth of the pinion shaft are mutually constrained in a circumferential direction and are freely separated from each other in the axial direction.

4 . The brake device of claim 3 , wherein, when the lever is operated and the unlock member moves toward the housing by the input member, the tooth plate moves together with the unlock member, so that the teeth of the pinion shaft and the teeth of the tooth plate are separated from each other to enable the pinion shaft to rotate freely.

5 . The brake device of claim 1 , wherein the tooth plate is inserted into the unlock member, an upper surface of the tooth place is in close contact with an upper surface of an inner space of the unlock member, and a lower surface of the tooth place is supported in contact with a second spring that elastically supports the unlock member in an opposite direction of the housing.

6 . The brake device of claim 1 , wherein a plurality of protrusions is formed on an outer peripheral surface of the tooth plate, and the protrusions are inserted into holding grooves formed on an inner peripheral surface of the unlock member to constrain the tooth plate in a rotational direction with respect to the unlock member.

7 . The brake device of claim 1 , wherein a guide protrusion formed on an intermediate wall of the housing in the axial direction is inserted into a guide groove formed in an outer peripheral surface of the unlock member in the axial direction, so that the unlock member is constrained in a rotational direction with respect to the housing.

Assignees

• Das Co Ltd

Inventors

• Kim Jae Ho

Classifications

• B60N2/1615 Primary

  Parallelogram-like structure · CPC title

• B60N2/167

  Ratchet mechanism · CPC title

• B60N2/1875

  Racks · CPC title

• B60N2/1889

  and provided with braking systems · CPC title

• B60N2/165

  Gear wheel driven mechanism · CPC title