Headrest

Patent metadata

Field	Value
Publication number	US-10266089-B2
Application number	US-201715598515-A
Country	US
Kind code	B2
Filing date	May 18, 2017
Priority date	May 24, 2016
Publication date	Apr 23, 2019
Grant date	Apr 23, 2019

Abstract

A headrest in one aspect of the present disclosure comprises a first frame member, a second frame member, a displacement mechanism to displace the second frame member with respect to the first frame member, a first guide shaft, a first bearing portion through which the first guide shaft is inserted, a second guide shaft, a second bearing portion through which the second guide shaft is inserted, a first fixing portion that comprises a first insertion hole into which one end of the first guide shaft is inserted, and a second fixing portion that comprises a second insertion hole into which one end of the second guide shaft is inserted.

First claim

What is claimed is:

1. A headrest comprising:
a headrest main body mounted to an upper end of a seatback to support a head of a seated person on a seat from a rear side;
a headrest movable portion arranged forward of the headrest main body and relatively displaceable in a front-rear direction with respect to the headrest main body,
wherein the headrest further comprises:
a first frame member configuring the headrest main body;
a second frame member configuring the headrest movable portion and being displaceable with respect to the first frame member;
a displacement mechanism configured to displace the second frame member with respect to the first frame member;
a first guide shaft fixed to one of the first frame member and the second frame member, and extending in a direction substantially parallel to a displacement direction of the second frame member, the first guide shaft being configured to guide another one of the first frame member and the second frame member so as to be displaced in the direction substantially parallel to the displacement direction;
a first bearing portion provided to the other one of the first frame member and the second frame member, the first guide shaft being inserted through the first bearing portion;
a second guide shaft fixed to one of the first frame member and the second frame member, and extending in a direction substantially parallel to the first guide shaft, the second guide shaft being configured to guide the other one of the first frame member and the second frame member so as to be displaced in the direction substantially parallel to the displacement direction;
a second bearing portion provided to the other one of the first frame member and the second frame member, the second guide shaft being inserted through the second bearing portion;
a first fixing portion provided to the one of the first frame member and the second frame member, and comprising a first insertion hole into which one end of the first guide shaft is inserted; and
a second fixing portion provided to the one of the first frame member and the second frame member, and comprising a second insertion hole into which one end of the second guide shaft is inserted, and
wherein a maximum gap dimension between the second insertion hole and the second guide shaft is greater than a maximum gap dimension between the first insertion hole and the first guide shaft.

2. The headrest according to claim 1 ,
wherein the second guide shaft is arranged at a position shifted in a substantially vertical direction and in a substantially horizontal direction with respect to the first guide shaft in a state where the headrest main body is mounted to the seatback, and
wherein the first insertion hole has a round shape, and the second insertion hole has a round shape having an inner diameter dimension greater than that of the first insertion hole.

3. The headrest according to claim 1 ,
wherein the second guide shaft is arranged at a position shifted in a substantially horizontal direction with respect to the first guide shaft in a state where the headrest main body is mounted to the seatback, and
wherein the first insertion hole has a round shape, and the second insertion hole has an elongated hole shape having a long diameter direction in a substantially horizontal direction.

4. The headrest according to claim 1 , further comprising:
a third guide shaft fixed to one of the first frame member and the second frame member and extending in a direction substantially parallel to the first guide shaft, the third guide shaft being configured to guide the other one of the first frame member and the second frame member so as to be displaced in the direction substantially parallel to the displacement direction;
a third bearing portion provided to the other one of the first frame member and the second frame member, the third guide shaft being inserted through the third bearing portion; and
a third fixing portion provided to the one of the first frame member and the second frame member, and comprising a third insertion hole into which one end of the third guide shaft is inserted,
wherein the third guide shaft is arranged at a position shifted in a substantially horizontal direction with respect to the first guide shaft in a state where the headrest main body is mounted to the seatback,
a maximum gap dimension between the third insertion hole and the third guide shaft is greater than a maximum gap dimension between the first insertion hole and the first guide shaft,
the second guide shaft is arranged at a position shifted in a substantially vertical direction and in a substantially horizontal direction with respect to the first guide shaft in a state where the headrest main body is mounted to the seatback,
the first insertion hole has a round shape,
the second insertion hole has a round shape having an inner diameter dimension greater than that of the first insertion hole, and
the third insertion hole has an elongated hole shape having a long diameter direction in a substantially horizontal direction.

5. The headrest according to claim 1 ,
wherein the one end of the first guide shaft is fastened and fixed to the first fixing portion by a first fastening member comprising a screw portion, and
wherein the one end of the second guide shaft is fastened and fixed to the second fixing portion by a second fastening member comprising a screw portion, and
wherein the first guide shaft comprises a first rotation restricting portion to restrict rotation of the first guide shaft when the first fastening member rotates, and the second guide shaft comprises a second rotation restricting portion to restrict rotation of the second guide shaft when the second fastening member rotates.

6. The headrest according to claim 5 ,
wherein the first rotation restricting portion is provided to the other end of the first guide shaft, and the second rotation restricting portion is provided to the other end of the second guide shaft.

7. The headrest according to claim 6 ,
wherein each of the first rotation restricting portion and the second rotation restricting portion comprises at least two planar faces, and
wherein the at least two planar faces are provided in an inner peripheral surface of a hole depressed from the other end toward the one end of a corresponding one of the first guide shaft and the second guide shaft.

8. The headrest according to claim 1 , further comprising:
a stay attached to the first frame member.

9. The headrest according to claim 1 ,
wherein the first guide shaft and the second guide shaft are allowed to protrude rearward of the first frame member.

10. A method for manufacturing a headrest,
the headrest comprising:
a headrest main body mounted to an upper end of a seatback to support a head of a seated person on a seat from a rear side;
a headrest movable portion arranged forward of the headrest main body and relatively displaceable in a front-rear direction with respect to the headrest main body;
a first frame member configuring the headrest main body;
a second frame member configuring the headrest movable portion and being displaceable with respect to the first frame member;
a displacement mechanism configured to displace the second frame member with respect to the first frame member;
a first guide shaft fixed to a one of the first frame member and the second frame member, and extending in a direction substantially parallel to a displacement direction of the second frame member, the first guide shaft being configured to guide another one of the first frame member and the second frame member so as to be displaced in the direction substantially parallel to the displacement direction;
a first bearing po

Assignees

• Toyota Boshoku Kk

Inventors

• Tatewaki Kenji
• Morishita Tatsuyuki
• Mori Masatoshi
• Toyoshima Hiroki

Classifications

• B60N2002/899

  characterised by structural or mechanical details not otherwise provided for · CPC title

• B60N2/865 Primary

  providing a fore-and-aft movement with respect to the occupant's head · CPC title