Vehicle seat

Patent metadata

Field	Value
Publication number	US-11364820-B2
Application number	US-202117203970-A
Country	US
Kind code	B2
Filing date	Mar 17, 2021
Priority date	Apr 3, 2017
Publication date	Jun 21, 2022
Grant date	Jun 21, 2022

Abstract

A vehicle seat (1) is provided with a cushion frame (5) that can be moved up and down by means of a link mechanism (6). To assist the upward movement of the cushion frame (5), a torsion bar (14) is disposed in a connection pipe (12) having both ends secured to a pair of left and right rear links (11, 11). A position holding member (24) holds the torsion bar (14) and is supported by the connection pipe (12), whereby the positional shift of the axis of the torsion bar (14) is suppressed. The position holding member (24) engages an extension portion (16) extending perpendicular to the shaft portion (15), and thus, does not rotate around the axis relative to the torsion bar (14). Therefore, in the position holding member (24), portions requiring reinforcement against a transverse force from the torsion bar (14) are limited a narrow range, and the position holding member (24) can be reduced in size and weight.

First claim

The invention claimed is:

1. A vehicle seat provided with a height-adjustable seat cushion, comprising:
a base member supported by a vehicle body;
a cushion frame constituting a frame of the seat cushion;
a link mechanism that supports the cushion frame to be movable up and down relative to the base member;
a drive mechanism that drives the cushion frame in a vertical direction via the link mechanism; and
a torsion bar that, to urge the cushion frame upward, extends between left and right side portions of the cushion frame and has lateral first and second ends respectively joined to a first portion and a second portion that rotate relative to each other in a pivot portion of the link mechanism,
wherein the torsion bar includes a shaft portion extending in a lateral direction and an extension portion at least partially extending in a direction intersecting the shaft portion and joined to the second portion on a side of the second end,
the first portion unrotatably supports the first end of the torsion bar and supports a part of the shaft portion of the torsion bar adjacent to the second end via a position holding member for suppressing displacement of the axis of the torsion bar,
one of the cushion frame and the link mechanism includes a connection member that is rotatable relative to the other,
the connection member constitutes the first portion,
the position holding member includes a main body including a side circumferential wall having a tubelike contour, the main body being received in an inner hole of the connection member,
one or more recesses extending along an axial direction are provided on an outer circumferential surface of the main body of the position holding member.

2. The vehicle seat according to claim 1 , wherein the main body is provided with a through-hole for insertion of the shaft portion, and
the side circumferential wall includes an inner circumferential wall defining the through-hole, an outer circumferential wall supported by the first portion, and multiple reinforcement walls connecting between the inner circumferential wall and the outer circumferential wall.

3. The vehicle seat according to claim 2 , wherein the multiple reinforcement walls extend in a radial direction.

4. The vehicle seat according to claim 3 , wherein the multiple reinforcement walls are not aligned with the recesses.

5. The vehicle seat according to claim 1 , wherein a number of the recesses is multiple,
a circumferential length of at least one of the recesses is longer than a circumferential distance between the recesses adjacent to each other in the circumferential direction.

6. The vehicle seat according to claim 1 , wherein the main body is provided with a flange that extends from a side circumferential surface in a radial direction, and
the recesses are continuous with the flange.

7. The vehicle seat according to claim 6 , wherein depths in the radial direction of the recesses are shorter than extension lengths in the radial direction of portions of the flange, the portions extending from the recesses.

8. The vehicle seat according to claim 1 , wherein the position holding member is provided, on a laterally inner end surface thereof, with a receiving groove recessed to extend in a radial direction so as to be capable of receiving the extension portion.

Assignees

• Ts Tech Co Ltd

Inventors

• NAKAZAWA Takatoshi
• Honda Wataru
• Taniguchi Hiromi

Classifications

• B60N2/161 Primary

  Rods · CPC title

• B60N2/1675

  with weight compensating means · CPC title

• B60N2/0232

  Operations & Transport · mapped topic

• B60N2/02246

  Electric motors therefor · CPC title