Seat pad, vehicle seat, vehicle seat controlling method, and seat pad manufacturing method

1. A vehicle seat comprising:

a seat pad including a main pad portion and a pair of side pad portions located on both left and right sides of the main pad portion; and

a pump,

wherein the main pad portion includes:

a bag-contained pad part including a foam body and a bag body arranged inside the foam body; and

a covering part covering an upper side of the bag-contained pad part,

wherein the pump is connected to the bag body to supply a fluid to an inside of the bag body,

wherein the covering part is configured integrally with the pair of side pad portions, and

wherein the bag-contained pad part is accommodated in a recess defined by the covering part and the pair of side pad portions.

2. The vehicle seat

according to claim 1 , wherein

the bag body is made of a non-stretchable material.

3. The vehicle seat according to claim 1 , wherein

a first valve is provided between the bag body and the pump, and

the first valve is a check valve or an on-off valve configured to allow only a passage of the fluid from the pump toward the bag body.

4. The vehicle seat according to claim 1 , wherein

an incompressibility fluid is provided to be capable of being supplied to the inside of the bag body.

5. The vehicle seat according to claim 1 , wherein

the bag body is made of a stretchable material, and

the bag body is constrained so that a volume of the bag body does not increase beyond a certain level.

6. The vehicle seat according to claim 2 , wherein

a first valve is provided between the bag body and the pump, and

the first valve is a check valve or an on-off valve configured to allow only a passage of the fluid from the pump toward the bag body.

7. The vehicle seat according to claim 2 , wherein

an incompressibility fluid is provided to be capable of being supplied to the inside of the bag body.

8. The vehicle seat according to claim 5 , wherein

a first valve is provided between the bag body and the pump, and

the first valve is a check valve or an on-off valve configured to allow only a passage of the fluid from the pump toward the bag body.

9. The vehicle seat according to claim 5 , wherein

an incompressibility fluid is provided to be capable of being supplied to the inside of the bag body.

10. The vehicle seat according to claim 8 , wherein

an incompressibility fluid is provided to be capable of being supplied to the inside of the bag body.

11. A seat pad manufacturing method for manufacturing a seat pad including a main portion and a pair of side portions located on both left and right sides of the main pad portion, the main pad portion including a bag-contained pad part and a covering part covering an upper side of the bag-contained pad part, the method comprising:

a molding step in which the covering part of the main portion and the pair of side pad portions are integrally molded to define a recess;

a bag body attaching step in which a to-be-held portion provided in the bag body is held in a holding portion provided in a mold, and the bag body is positioned and attached to the mold;

an injecting step in which a foamable material is injected into the mold to which bag body is attached;

a foaming step in which the foamable material in the mold is foamed to form the bag-contained pad part; and

a bag-contained pad part accommodating step in which the bag-contained pad part is accommodated in the recess defined by the covering part and the pair of side pad portions, wherein

in the bag body attaching step, the bag body is constrained so that a volume of the bag body does not increase beyond a certain level.

12. The seat pad manufacturing method according to claim 11 , wherein

the holding portion is installed to protrude inside the mold so that the bag body is arranged to float inside the mold.

13. The vehicle seat according to claim 3 , wherein

an incompressibility fluid is provided to be capable of being supplied to the inside of the bag body.