Vehicle seat

1. A vehicle seat, comprising:

a seat cushion that is composed of a stationary cushion portion and a movable cushion portion, in which the movable cushion portion is capable of being tilted so as to be low in a side facing a door opening while being raised with respect to the stationary cushion portion, and

a cushion tilting mechanism that is disposed under the seat cushion and is configured to tilt the movable cushion portion while raising the same with respect to the stationary cushion portion,

wherein the seat cushion has a central portion that is longitudinally divided into a plurality of portions, and side portions that are positioned in right and left sides of the central portion and are formed to be higher than the central portion,

wherein the movable cushion portion is composed of a cushion central portion of the central portion of the seat cushion and a central portion of the side portion that is positioned in the side facing a door opening,

wherein the stationary cushion portion is composed of a cushion front portion and a cushion rear portion of the central portion of the seat cushion, a front portion and a back portion of the side portion that is positioned in the side facing a door opening, and the side portion that is positioned in a side opposite to the side facing a door opening, and

wherein the movable cushion portion is integrally formed and is separated from the stationary cushion portion.

2. The vehicle seat as defined in claim 1 , wherein the cushion tilting mechanism has a first link that is rotatable from a folded position to a raised position under the seat cushion, a second link that is positioned to intersect with the first link and is connected thereto so as to be substantially symmetrically movable with the first link, and a drive portion that is capable of rotating the first and second links from the folded position to the raised position, and

wherein when the first link and the second link is rotated from the folded position to the raised position, the movable cushion portion of the seat cushion can be tilted so as to be low in the side facing a door opening while being raised with respect to the stationary cushion portion.

3. The vehicle seat as defined in claim 1 , wherein the cushion tilting mechanism has a connection mechanism that is capable of vertically rotatably connecting the movable cushion portion of the seat cushion to a support member, and a drive portion that is capable of vertically rotating the movable cushion portion about a rotation center of the connection mechanism, and

wherein when the movable cushion portion rotates upwardly about the rotation center of the connection mechanism, the movable cushion portion can be tilted so as to be low in the side facing a door opening while being raised with respect to the stationary cushion portion.

4. The vehicle seat as defined in claim 1 further comprising a longitudinal slide mechanism that is configured to slide a seat frame supporting the seat cushion along a vehicle floor, and a frame raising/lowering mechanism that is configured to raise and lower the seat frame with respect to the vehicle floor.

5. The vehicle seat as defined in claim 1 , wherein when a raising switch is operated while a door of a door opening is opened, the cushion tilting mechanism can be driven in a direction in which the movable cushion portion of the seat cushion can be raised.

6. The vehicle seat as defined in claim 1 , wherein the cushion tilting mechanism has a drive mechanism that is configured to horizontally reciprocate a movable portion under the seat cushion, and

a link mechanism that is configured such that when the movable portion moves in a predetermined direction due to the action of the drive mechanism, the movable cushion portion of the seat cushion can be tilted according to an amount of motion of the movable portion.

7. The vehicle seat as defined in claim 6 further including a rotation mechanism that is configured to horizontally rotate the seat cushion toward a door opening of a vehicle.

8. The vehicle seat as defined in claim 6 , wherein the link mechanism is configured to tilt the movable cushion portion of the seat cushion toward a door opening of a vehicle, and

further including a slide mechanism that is configured to slide the movable cushion portion, the link mechanism and the drive mechanism horizontally toward the door opening of the vehicle.

9. The vehicle seat as defined in claim 6 , wherein the link mechanism is formed along the movable cushion portion of the seat cushion, and has a cushion support member that is integrated with the movable cushion portion, a horizontal support portion that supports a midway portion of the cushion support member horizontally as a center of vertical rotation thereof, and a link that vertically rotatably connects one end of the cushion support member nearer to the horizontal support portion and the movable portion of the drive mechanism.

10. The vehicle seat as defined in claim 6 , wherein the link mechanism is formed along the movable cushion portion of the seat cushion, and has a cushion support member that is integrated with the movable cushion portion, a horizontal support portion that supports one end of the cushion support member horizontally as a center of vertical rotation thereof, and a link that vertically rotatably connects a midway portion of the cushion support member and the movable portion of the drive mechanism.

11. The vehicle seat as defined in claim 1 further comprising a closing Member that is capable of closing an open portion that is formed between a lower end of the movable cushion portion and a seating surface of the stationary cushion portion in a boundary position between the movable cushion portion and the stationary cushion portion when the movable cushion portion is raised with respect to the stationary cushion portion.

12. The vehicle seat as defined in claim 11 , wherein the closing member is composed of a fence-like plate portion that is projected downwardly from a lower end of a boundary position-side surface of the movable cushion portion, and a deformable sheet member that is capable of closing the open portion between a lower end edge of the plate portion and a boundary position-side surface of the stationary cushion portion.

13. The vehicle seat as defined in claim 12 , wherein the sheet member is connected to the plate portion.

14. The vehicle seat as defined in claim 12 , wherein a proximal end portion of the sheet member is connected to a lower end edge of the plate portion attached to the movable cushion portion or is connected to the movable cushion portion in an inner side of the plate portion, wherein a distal end portion of the sheet member is connected to the boundary position-side surface of the stationary cushion portion, so that the sheet member can be unfolded as the movable cushion portion is raised, and

wherein a height as measured from a seating surface of the movable cushion portion to a connecting position of the plate portion and the sheet member or to the lower end edge of the plate portion is set to be larger than a height as measured from the connecting position or the lower end edge of the plate portion to the seating surface of the stationary cushion portion when the movable cushion portion is positioned in a getting in/out position.

15. The vehicle seat as defined in claim 11 , wherein the boundary position-side surface of the stationary cushion portion is inclined upwardly, wherein the boundary position-side surface of the movable cushion portion is inclined downwardly, and wherein the boundary position-side surface of the movable cushion portion is capable of surface-contacting the boundary position-side surface of the stationary cushion portion when the movable cushion portion is positioned in the sitting position.

16. The vehicle seat as defined in claim 1 , wherein an operating switch of a drive portion of the cushion tilting mechanism is positioned in an interior side of the door that is opened when the occupant gets out of the vehicle, so as to be positioned under a window, and wherein the drive portion can be driven when the operating switch is operated while the door is opened.

17. The vehicle seat as defined in claim 16 , wherein the drive portion has a motor, wherein the operating switch can be turned on only when the operating switch is operated, and wherein electricity can be supplied to the motor only when the operating switch is turned on.

18. The vehicle seat as defined in claim 16 , wherein in a condition in which the door is not rotated to a desired position in an opening direction, even when the operating switch is turned on, no electricity is supplied to the motor.