Vehicle seat and adjustment method for pad vibration characteristic

1. A vehicle seat comprising:

a pad including a foam; and

a volume adjustment mechanism that allows adjustment of a volume of the foam,

the pad comprising:

a main pad member including a foam; and

a side pad member including a foam and disposed adjacent to each of both sides of the main pad member;

wherein the foam of the side pad member has a thickness in a vertical direction larger than a thickness of the foam of the main pad member and protrudes above in the vertical direction relative to the foam of the main pad member;

the volume adjustment mechanism comprises a pressing member being movable in a horizontal direction, and the pressing member moves and presses the foam of the main pad member to thereby be capable of compressing the foam of the main pad member in the horizontal direction;

the pressing member is arranged between the foam of the main pad member and the foam of the side pad member; and

the foam of the side pad member includes a coating portion protruding toward the main pad member so as to cover an upper side of the pressing member and vertically overlapping with an end portion on an upper surface of the foam of the main pad member.

2. The vehicle seat according to claim 1 , wherein the volume adjustment mechanism allows adjustment of the volume of the foam of the main pad member within a predetermined range of the volume in terms of ratio with respect to that in a natural state.

3. The vehicle seat according to claim 2 , wherein the volume adjustment mechanism is capable of compressing the foam of the main pad member, and

the predetermined range is set within a range of 40 to 99% with respect to the volume in the natural state.

4. The vehicle seat according to claim 3 , wherein the predetermined range is set within a range of 70 to 99% with respect to the volume in the natural state.

5. The vehicle seat according to claim 4 , further comprising a frame supporting the pad,

wherein the pressing member is attached to the frame so as to be movable with respect to the frame in the horizontal direction, and

the pressing member moves with respect to the frame and presses the foam of the main pad member to thereby be capable of compressing the foam of the main pad member.

6. The vehicle seat according to claim 5 , wherein the frame comprises a frame body portion supporting the main pad member from below in the vertical direction, and

a lower surface of the foam of the main pad member in the vertical direction is formed in a raised shape and an upper surface of the foam of the main pad member in the vertical direction is formed in a recessed shape.

7. The vehicle seat according to claim 3 , further comprising a frame supporting the pad,

wherein the pressing member is attached to the frame so as to be movable with respect to the frame in the horizontal direction, and

the pressing member moves with respect to the frame and presses the foam of the main pad member to thereby be capable of compressing the foam of the main pad member.

8. The vehicle seat according to claim 7 , wherein the frame comprises a frame body portion supporting the main pad member from below in the vertical direction, and

a lower surface of the foam of the main pad member in the vertical direction is formed in a raised shape and an upper surface of the foam of the main pad member in the vertical direction is formed in a recessed shape.

9. The vehicle seat according to claim 3 , wherein the foam of the main pad member is polyurethane foam.

10. The vehicle seat according to claim 2 , further comprising a frame supporting the pad,

wherein the pressing member is attached to the frame so as to be movable with respect to the frame in the horizontal direction, and

the pressing member moves with respect to the frame and presses the foam of the main pad member to thereby be capable of compressing the foam of the main pad member.

11. The vehicle seat according to claim 10 , wherein the frame comprises a frame body portion supporting the main pad member from below in the vertical direction, and

a lower surface of the foam of the main pad member in the vertical direction is formed in a raised shape and an upper surface of the foam of the main pad member in the vertical direction is formed in a recessed shape.

12. The vehicle seat according to claim 2 , wherein the foam of the main pad member is polyurethane foam.

13. The vehicle seat according to claim 2 , wherein a surface of the foam of the main pad member positioned on at least one side in the vertical direction comprises a raised shape.

14. The vehicle seat according to claim 1 , wherein a surface of the foam of the main pad member positioned on at least one side in the vertical direction comprises a raised shape.

15. The vehicle seat according to claim 1 , further comprising a frame supporting the pad,

wherein the pressing member is attached to the frame so as to be movable with respect to the frame in the horizontal direction, and

the pressing member moves with respect to the frame and presses the foam of the main pad member to thereby be capable of compressing the foam of the main pad member.

16. The vehicle seat according to claim 15 , wherein the foam of the main pad member is polyurethane foam.

17. The vehicle seat according to claim 15 , wherein the frame comprises a frame body portion supporting the main pad member from below in the vertical direction, and

a lower surface of the foam of the main pad member in the vertical direction is formed in a raised shape and an upper surface of the foam of the main pad member in the vertical direction is formed in a recessed shape.

18. The vehicle seat according to claim 1 , wherein the foam of the main pad member is polyurethane foam.

19. The vehicle seat according to claim 1 , wherein the foam of the main pad member has a notch portion at the end portion on the upper surface of the foam of the main pad member, and

the coating portion of the foam of the side pad member enters the notch portion of the foam of the main pad member.