Vehicle seat backrest, vehicle seat comprising such a backrest, and method for manufacturing such a seat backrest

Patent metadata

Field	Value
Publication number	US-11370331-B2
Application number	US-202017104655-A
Country	US
Kind code	B2
Filing date	Nov 25, 2020
Priority date	Nov 29, 2019
Publication date	Jun 28, 2022
Grant date	Jun 28, 2022

Abstract

A method for manufacturing a vehicle seat backrest comprises the steps of: providing first and second uprights of a backrest frame and a support member of an upper backrest adjustment device; positioning the first upright partly facing a first side face of the support member and the second upright partly facing a second side face of the support member; moving the first upright relative to the second upright along a transverse direction of the support member, in order to sandwich the support member such that the support member of the upper backrest adjustment device is mounted on the first and second uprights of the backrest frame so as to pivot about a transverse axis.

First claim

The invention claimed is:

1. A method for manufacturing a vehicle seat backrest, comprising the steps of:
i. providing a first upright of a backrest frame, a second upright of the backrest frame, and a support member of an upper backrest adjustment device,
ii. positioning the first upright of the backrest frame partly facing a first side face of the support member and the second upright of the backrest frame partly facing a second side face of the support member,
iii. moving the first upright relative to the second upright of the backrest frame, along a transverse direction of the support member, in order to sandwich the support member of the upper backrest adjustment device such that the support member of the upper backrest adjustment device is mounted on the first and second uprights of the backrest frame so as to pivot about a transverse axis,
wherein the vehicle seat backrest includes an actuator for adjusting the position of the support member about said transverse axis, and
wherein the actuator comprises:
a motor,
a worm screw extending in a main direction of extension perpendicular to the transverse axis, and able to be moved along said main direction of extension by the rotation of the motor,
a movable assembly at one end of the worm screw,
at least one connecting rod, the connecting rod being mounted so as to pivot relative to said movable assembly about a first shaft parallel to the transverse axis, at a first end, and intended to be mounted so as to pivot relative to the backrest frame about a second shaft parallel to the transverse axis, at a second end, such that the displacement of the worm screw due to the rotation of the motor is able to cause rotation of the support member about said transverse axis.

2. The method of claim 1 , wherein, in step iii, reliefs of the first and second uprights of the backrest frame and reliefs of the support member are associated in order to guide the support member of the upper backrest adjustment device in rotation about the transverse axis.

3. The method of claim 2 , wherein, in step iii, the reliefs of the first and second uprights are associated by the complementarity of their shapes with the reliefs of the support member or with a part interposed between the reliefs of the support member and the reliefs of the first and second uprights.

4. The method of claim 1 , comprising a step i′ consisting of:
i′. positioning a crossmember of the backrest frame, relative to the support member,
step i′ being carried out between step i and ii, or after step iii.

5. The method of claim 4 , comprising a step iv consisting of:
iv. fixing the crossmember of the backrest frame to the first upright and/or second upright of the backrest frame.

6. The method of claim 1 , the method comprising a step v consisting of:
v. fixing the actuator of the upper backrest adjustment device to the support member and/or to at least one among the first upright, the second upright, and/or the crossmember of the backrest frame where appropriate, the actuator being able to control the rotation of the support member about the transverse axis.

7. A vehicle seat backrest, the backrest comprising a backrest frame and an upper backrest adjustment device, the backrest frame comprising a first upright and a second upright, the upper backrest adjustment device comprising a support member, the support member comprising a body intended to receive and support the upper back of an occupant of the seat, the support member being mounted so as to pivot on the first and second uprights of the backrest frame about a transverse axis, the support member and the first and second uprights of the backrest frame comprising associated reliefs, for guiding the support member in rotation relative to the first and second uprights of the backrest frame, about the transverse axis,
wherein the upper backrest adjustment device comprises an actuator, for adjusting the position of the support member about the transverse axis, and
wherein the actuator comprises:
a motor,
a worm screw extending in a main direction of extension perpendicular to the transverse axis, and able to be moved along said main direction of extension by the rotation of the motor,
a movable assembly at one end of the worm screw,
at least one connecting rod, the connecting rod being mounted so as to pivot relative to said movable assembly about a first shaft parallel to the transverse axis, at a first end, the connecting rod also being mounted so as to pivot relative to the backrest frame about a second shaft parallel to the transverse axis, at a second end, such that the displacement of the worm screw parallel to the transverse axis, due to the rotation of the motor, causes rotation of the support member about said transverse axis.

8. The vehicle seat backrest of claim 7 , wherein the reliefs of the support member project transversely from the body of the support member, the reliefs of the support member each being received in a housing of the first and second uprights of the backrest frame.

9. The vehicle seat backrest of claim 8 , wherein the reliefs of the support member are made as one piece with the body of the support member.

10. The vehicle seat backrest of claim 7 , wherein the reliefs of the support member are cylindrical of revolution, their axis being the transverse axis.

11. The vehicle seat backrest of claim 7 , further comprising bushings mounted on the reliefs of the support member, the bushings having an outer face complementary to the housings of the first and second uprights of the backrest frame in order to guide the support member in rotation relative to the first and second uprights of the backrest frame, about the transverse axis.

12. A vehicle seat comprising a seating portion with a seating portion frame, and a seat backrest according to claim 7 , the backrest frame being fixed to the seating portion frame.

13. An upper backrest adjustment device for a vehicle seat, the vehicle seat comprising a backrest with a backrest frame, the upper backrest adjustment device comprising a support member, the support member comprising a body intended to receive and support the upper back of an occupant of the seat, the support member further comprising reliefs intended to be associated with housings in the backrest frame, in order to guide a rotation, about a transverse axis, of the support member relative to the backrest frame, the reliefs projecting transversely from the body of the support member,
further comprising an actuator for adjusting the position of the support member about said transverse axis, and
wherein the actuator comprises:
a motor,
a worm screw extending in a main direction of extension perpendicular to the transverse axis, and able to be moved along said main direction of extension by the rotation of the motor,
a movable assembly at one end of the worm screw, and
at least one connecting rod, the connecting rod being mounted so as to pivot relative to said movable assembly about a first shaft parallel to the transverse axis, at a first end, and intended to be mounted so as to pivot relative to the backrest frame about a second shaft parallel to the transverse axis, at a second end, such that the displacement of the worm screw due to the rotation of the motor is able to cause rotation of the support member about said transverse axis.

14. The upper backrest adjustment device of claim 13 , wherein the reliefs of the support member are made as one piece with the body of the support member.

15. The upper backrest adjustment device of claim 13 , wherein the reliefs of the support member are cylindrical of revolution, thei

Assignees

• Faurecia Sieges Dautomobile

Inventors

• Mazzamurro Frédéric
• Unrau Dimitri

Classifications

• B60N2/85

  with continuous positioning · CPC title

• B60N2/897

  with sleeves located in the back-rest for guiding the rods of the head-rest · CPC title

• B60N2/806

  movable or adjustable · CPC title

• B60N2/68

  Seat frames · CPC title

• B60N2/2222 Primary

  the back-rest having two or more parts · CPC title