Seat of vehicle

1. A seat of a vehicle, comprising:

a center supporting block having a first supporting surface for supporting an occupant;

a plurality of side supporting blocks, each side supporting block being arranged at a side of the center supporting block in a width direction of the center supporting block, each side supporting block having a second supporting surface that protrudes relatively further than the first supporting surface of the center supporting block, each side supporting block including an upper side-supporting block for supporting a shoulder of the occupant and a lower side-supporting block for supporting a hip of the occupant;

a plurality of movable supporting blocks, each of the movable supporting blocks being arranged between the center supporting block and one of the upper side supporting blocks, each movable supporting block having a third supporting surface that is flush with the first supporting surface while in an initial state;

a plurality of joining portions, each of the joining portions joining one of the side supporting blocks to one of the movable supporting blocks; and

expanding devices that are arranged at a back side of the side supporting blocks, expand the side supporting blocks, and incline the movable supporting blocks with respect to the first supporting surface of the center supporting block.

2. The seat of a vehicle according to claim 1 , further comprising

supporting plates that are arranged between the expanding devices and the side supporting blocks, and contact the side supporting blocks and the movable supporting blocks.

3. The seat of a vehicle according to claim 1 , further comprising

fixing portions that join the movable supporting blocks and the center supporting block at a location near a junction of the first supporting surface of the center supporting block and the third supporting surfaces of the movable supporting blocks.

4. A seat of a vehicle, comprising:

a center supporting block having a first supporting surface for supporting an occupant;

a plurality of side supporting blocks, each side supporting block being arranged at a side of the center supporting block in a width direction of the center supporting block, and each side supporting block having a second supporting surface that protrudes relatively further than the first supporting surface of the center supporting block, each side supporting block including an upper side-supporting block for supporting a shoulder of the occupant and a lower side-supporting block for supporting a hip of the occupant;

a plurality of movable supporting blocks, each of the movable supporting blocks being arranged between the center supporting block and one of the upper side supporting blocks, each movable supporting block having a third supporting surface that is flush with the first supporting surface while in an initial state;

lower expanding devices that are arranged at a back side of the side supporting blocks, and move the side supporting blocks toward an inside in the width of the center supporting block, and

upper expanding devices that are arranged at the back side of the side supporting blocks, and incline the movable supporting blocks with respect to the first supporting surface of the center supporting block.

5. The seat of a vehicle according to claim 4 , further comprising

elastic members that are extendable and connect between the side supporting blocks and a seat frame member.

6. A seat of a vehicle, comprising:

a center supporting block having a first supporting surface for supporting an occupant;

a plurality of side supporting blocks, each side supporting block having a second supporting surface that protrudes relatively further than the first supporting surface of the center supporting block, each side supporting block including an upper side-supporting block for supporting a shoulder of the occupant and a lower side-supporting block for supporting a hip of the occupant;

a plurality of movable supporting blocks, each of the movable supporting blocks being arranged between the center supporting block and one of the upper side supporting blocks, each movable supporting block having a third supporting surface that is flush with the first supporting surface while in an initial state; and

expandable bags each being airtight and provided at back sides of the side supporting blocks,

wherein a total width of the first supporting surface of the center supporting block is adjusted by supplying a gas to the expandable bags to move the side supporting blocks, and

wherein the expandable bags incline the movable supporting blocks with respect to the first supporting surface of the center supporting block.

7. The seat of a vehicle according to claim 6 , further comprising:

expanding devices that move the upper supporting blocks and incline the movable supporting blocks with respect to the first supporting surface of the center supporting block by supplying the gas to the expandable bags.

8. The seat of a vehicle according to claim 7 , further comprising

supporting plates each arranged between the expanding devices and the side supporting blocks, and contact the side supporting blocks and the movable supporting blocks.

9. The seat of a vehicle according to claim 7 , further comprising

fixing portions that join the movable supporting blocks and the center supporting block at a location near a junction of the first supporting surface of the center supporting block and the third supporting surface of the movable supporting blocks.

10. The seat of a vehicle according to claim 6 , wherein:

the lower side-supporting blocks are movably provided to the center supporting block; and

the lower side-supporting blocks move toward an inside in the width of the center supporting block by supplying the gas to the expandable bags.

11. The seat of a vehicle according to claim 10 , further comprising

elastic members that are extendable and connect between the side supporting blocks and a seat frame member.