HEADREST

• US 20170341546A1
• Filed: 05/16/2017
• Published: 11/30/2017
• Est. Priority Date: 05/24/2016
• Status: Active Grant

• Current Assignee: Toyota Boshoku Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Boshoku Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: TATEWAKI, Kenji, MORISHITA, Tatsuyuki, MORI, Masatoshi, TOYOSHIMA, Hiroki
• Granted Patent: US 10,293,727 B2
• Time in Patent Office: Days
• CPC Class Codes: B60N 2/865 providing a fore-and-aft movement with respect to the occupant's head

Abstract

A headrest in one aspect of the present disclosure comprises a first frame member, a second frame member, a displacement mechanism configured to displace the second frame member with respect to the first frame member, a first guide shaft, and a second guide shaft arranged at a position shifted in a substantially vertical direction and in a substantially horizontal direction with respect to the first guide shaft.

Claims

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;

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 first selected 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 a second selected 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; and

a second guide shaft fixed to a third selected 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 a fourth selected 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,

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.

2. The headrest according to claim 1, further comprising at least one third guide shaft fixed to a fifth selected one of the first frame member and the second frame member and extending in a direction substantially parallel to the first guide shaft, the at least one third guide shaft being configured to guide a sixth selected 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.

3. The headrest according to claim 2, wherein the at least one third guide shaft is arranged at a position shifted in a substantially vertical direction and in a substantially horizontal direction with respect to at least one of the first guide shaft or the second guide shaft in a state where the headrest main body is mounted to the seatback.

4. The headrest according to claim 2, wherein the displacement mechanism comprises:

a lead screw portion extending in a direction substantially parallel to the first guide shaft and having one end coupled to a seventh selected one of the first frame member and the second frame member; and

a driving device fixed to an eighth selected one of the first frame member and the second frame member, and comprising a nut portion to be engaged with the lead screw portion,

wherein the lead screw portion is located within an imaginary polygon formed by using the first guide shaft, the second guide shaft, and the at least one third guide shaft to define apexes of the imaginary polygon.

5. The headrest according to claim 4, wherein the driving device is arranged between the first frame member and the second frame member.

6. The headrest according to claim 4, wherein, in a state where the headrest main body is mounted to the seatback, the first guide shaft, the second guide shaft, and the at least one third guide shaft comprise:

at least one upper guide shaft positioned above the lead screw portion in the substantially vertical direction; and

at least one lower guide shaft positioned below the lead screw portion in the substantially vertical direction,

wherein the number of the at least one upper guide shaft is equal to or greater than the number of the at least one lower guide shaft.

7. The headrest according to claim 6, further comprising:

a first bearing portion provided to the second selected one of the first frame member and the second frame member, a second bearing portion provided to the fourth selected one of the first frame member and the second frame member, and at least one third bearing portion provided to the sixth selected one of the first frame member and the second frame member, the first, second, and at least one third bearing portions each having a cylindrical shape allowing insertion therethrough of a corresponding one of the first guide shaft, the second guide shaft, and the at least one third guide shaft, and the first, second, and at least one third bearing portions comprising;

at least one lower bearing portion each allowing insertion therethrough of a corresponding one of the at least one lower guide shaft; and

at least one upper bearing portion each allowing insertion therethrough of a corresponding one of the at least one upper guide shaft,

wherein the at least one lower bearing portion has an axial length greater than an axial length of the at least one upper bearing portion.

8. The headrest according to claim 6, wherein the at least one lower guide shaft has an axial length greater than an axial length of the at least one upper guide shaft.