Headrest assembly for vehicle seat and vehicle seat comprising such an assembly

1. A headrest assembly for a vehicle seat, the headrest assembly comprising:

two pins each extending substantially along an adjustment direction between a lower end and an upper end, each of the two pins having a mounting portion comprising the lower end and adapted to be fixed to a backrest of a seat, an adjustment portion comprising the upper end, and an intermediate portion between the mounting portion and the adjustment portion,

a head-supporting structure adapted to support the head of a user,

an interface made of plastic, the interface being overmolded on the intermediate portions of the two pins such that said interface interconnects said two pins and is formed with said two pins in one piece, and

an adjustment plate integrally secured to the adjustment portion of each of the two pins, the head-supporting structure being mounted so as to be adjustable in translation on the adjustment plate along the adjustment direction.

2. Headrest assembly according to claim 1 , wherein the adjustment plate is made of plastic overmolded on the adjustment portion of each of the two pins.

3. Headrest assembly according to claim 1 , wherein the interface is overmolded as one piece on the pins along with the adjustment plate so as to form a support structure, the support structure being formed as a single piece.

4. Headrest assembly according to claim 1 , wherein the adjustment plate is at least partially overmolded by the interface.

5. Headrest assembly according to claim 1 , wherein the two pins are made of metal and wherein the intermediate portions of the pins are at least partially covered by the overmolded interface.

6. Headrest assembly according to claim 1 , wherein the intermediate portions of the pins are completely covered by the overmolded interface.

7. Headrest assembly according to claim 1 , wherein the interface is solid.

8. Headrest assembly according to claim 1 , wherein the interface is overmolded as one piece on the intermediate portions of the pins.

9. Headrest assembly according claim 1 , wherein the intermediate portion of each of the pins has an offset area with a base extending in a transverse direction perpendicular to the adjustment direction and two bends connecting said base to the other pin portions extending along the adjustment direction.

10. A method for manufacturing a headrest assembly according to claim 1 , wherein the method comprises the step of:

injection molding the interface of plastic material so as to interconnect the two pins.

11. Method according to claim 10 , wherein the two metal pins are placed in a mold, and wherein the plastic injection molding is carried out in order to at least partially overmold the interface on the intermediate portion of each of the pins.

12. Method according to claim 10 , further comprising the step of:

plastic injection molding the adjustment plate while overmolding the adjustment portion of each of the pins.

13. Method according to claim 10 , wherein the adjustment plate is placed in a mold, and wherein the plastic injection molding is carried out in order to at least partially overmold the interface on the adjustment plate.

14. Method according to claim 13 , further comprising the steps of:

integrally securing the adjustment plate to the adjustment portion of the two pins to form an assembly,

placing in the mold the assembly formed by the adjustment plate and the two pins, and

plastic injection molding the interface while overmolding the intermediate portion of the two pins and the adjustment plate.

15. A seat comprising a backrest and the headrest assembly according to claim 1 , wherein the two pins are integral with the backrest.

16. Seat according to claim 15 , wherein the backrest comprises an upper part from which the pins extend, and said upper part is covered by the interface.