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1. WO2014168583 - HEADREST STRUCTURE, HEADREST CUSHION AND PASSENGER SEAT

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[ EN ]

CLAIMS

1. A headrest structure for a passenger seat, the headrest structure comprising:

an adjustable headrest frame for connection to a passenger seat; and

a headrest cushion mounted to the adjustable headrest frame such that the headrest cushion is moveable relative to a seat back of the passenger seat by way of the adjustable headrest frame;

wherein the headrest cushion comprises a support surface facing away from the headrest frame, the support surface comprising a concave upper part and a convex bottom part relative to the passenger seat.

2. The headrest structure as claimed in claim 1 , wherein the headrest cushion comprises voids formed in a body thereof, the voids being aligned with respective folding joints of the adjustable headrest frame for folding side portions of the headrest frames relative to a mid-portion of the headrest frame.

3. The headrest structure as claimed in claims 1 or 2, wherein the headrest cushion comprises a mid-portion having a first compressive strength, and side portions having a second compressive strength different from the first compressive strength.

4. The headrest structure as claimed in claim 3, wherein the first compressive strength is higher than the second compressive strength.

5. The headrest structure as claimed in claims 3 or 4, wherein the mid-portion of the headrest cushion is mounted to a center mounting plate of the adjustable headrest frame.

6. The headrest structure as claimed in any one of claims 3 to 5, wherein the side portions of the headrest cushion are mounted to respective side mounting plates of the adjustable headrest frame.

7. The headrest structure as claimed in any one of the preceding claims, wherein the concave upper part of the support surface directly meets the convex bottom part of the support surface such that a cross-section of the headrest cushion along a vertical axis relative to the passenger seat is substantially-reverse S-shaped.

8. The headrest structure as claimed in any one of the preceding claims, wherein the curvature of the concave upper part is shallower than the curvature of the convex lower part. 9. The headrest structure as claimed in any one of the preceding claims, wherein the concave upper part and the convex bottom part each extend substantially across the horizontal width of the headrest cushion relative to the passenger seat.

10. The headrest structure as claimed in any one of the preceding claims, wherein the adjustable headrest frame comprises a 4-way headrest frame.

11. The headrest structure as claimed in any one of claims 1 to 9, wherein the adjustable headrest frame comprises a 6- way headrest frame.

12. The headrest as claimed in claim 11, wherein the headrest frame is configured such that the headrest cushion is moveable in upward and downward directions, in forward and backward tilt, and folding along two fold lines.

13. A headrest cushion for an adjustable headrest frame for a passenger seat, the headrest cushion being configured for mounting to the adjustable headrest frame such that the headrest cushion is moveable relative to a seat back of the passenger seat by way of the adjustable headrest frame, and wherein the headrest cushion comprises a support surface disposed for facing away from the headrest frame, the support surface comprising a concave upper part and a convex bottom part relative to the passenger seat.

14. The headrest cushion as claimed in claim 13, wherein the headrest cushion comprises voids formed in a body thereof, the voids being aligned with respective folding joints of the adjustable headrest frame for folding side portions of the headrest frames relative to a mid- portion of the headrest frame.

15. The headrest cushion as claimed in claims 13 or 14, wherein the headrest cushion comprises a mid-portion having a first compressive strength, and side portions having a second compressive strength different from the first compressive strength.

16. The headrest cushion as claimed in claim 15, wherein the first compressive strength is higher than the second compressive strength.

17. The headrest cushion as claimed in claims 15 or 16, wherein the mid-portion of the headrest cushion is configured for mounting to a center mounting plate of the adjustable headrest frame.

, 18. The headrest cushion as claimed in any one of claims 15 to 17, wherein the side portions of the headrest cushion are configured for mounting to respective side mounting plates of the adjustable headrest frame.

19. The headrest cushion as claimed in any one of claims 13 to 18, wherein the concave upper part of the support surface directly meets the convex bottom part of the support surface such that a cross-section of the headrest cushion along a vertical axis relative to the passenger seat is substantially reverse S-shaped.

20. The headrest cushion as claimed in any one of claims 13 to 19, wherein the curvature of the concave upper part is shallower than the curvature of the convex lower part.

21. The headrest cushion as claimed in any one of claims 13 to 20, wherein the concave upper part and the convex bottom part each extend substantially across the horizontal width of the headrest cushion relative to the passenger seat.

2. A passenger seat comprising a headrest structure as claimed in any one of claims 1 to