Seat apparatus for vehicle

1. A seat apparatus for a vehicle, comprising:

a seat cushion frame adapted to support a seat cushion of the vehicle, the seat cushion frame operated to move between a first position and a second position relative to a vehicle floor;

a link member including a first end adapted to be pivotably connected to the vehicle floor and a second end pivotably connected at a connection point to a first end portion of the seat cushion frame to support the first end portion of the seat cushion frame to the vehicle floor;

a guiding member adapted to be provided at the vehicle floor to support a second end portion of the seat cushion frame to the vehicle floor and including a guiding groove; and

a sliding member provided at the second end portion of the seat cushion frame and slidably engaged into the guiding groove of the guiding member,

wherein the guiding groove extends along a connection line that extends between the sliding member and the connection point between the seat cushion frame and the link member to define a movement path so as to move the seat cushion frame between the first position and the second position.

2. A seat apparatus for a vehicle according to claim 1 , wherein

the first position of the seat cushion frame corresponds to a position of the seat cushion where an occupant is allowed to be seated on the seat cushion,

and the second position of the seat cushion frame corresponds to a position of the seat cushion where the seat cushion is retracted relative to the vehicle floor.

3. A seat apparatus for a vehicle according to claim 1 , wherein

the guiding groove of the guiding member includes a plurality of groove portions formed along the corresponding connection lines respectively connecting a plurality of first points defined on the movement path of the connection point between the link member and the seat cushion frame cooperatively moving with the pivotal movement of the link member and a plurality of second points defined on a movement path of a predetermined point of the sliding member in association with the plurality of first points, the guiding groove formed by connecting the plurality of groove portions.

4. A seat apparatus for a vehicle according to claim 3 , wherein

the plurality of first points are defined on the movement path of the connection point between the link member and the seat cushion frame by a predetermined angle interval.

5. A seat apparatus for a vehicle according to claim 3 , wherein

the guiding member includes an arced groove formed by the plurality of groove portions continuously connected.

6. A seat apparatus for a vehicle according to claim 3 , wherein

the plurality of groove portions is provided at an end portion of the guiding groove at which the sliding member is engaged when the seat cushion frame is located at the first position.

7. A seat cushion apparatus for a vehicle according to claim 1 , further comprising:

a pipe shaped torque rod including first and second ends rotatably connected to the seat cushion frame, respectively, each of the first and second ends provided at the corresponding connection point between the link member and the seat cushion frame and connected to the link member; and

a spring inserted into the torque rod and including first and second ends each engaged with the seat cushion frame and an intermediate portion engaged with the torque rod, the spring biasing the seat cushion frame to move towards the second position.

8. A seat apparatus for a vehicle according to claim 1 , wherein

the guiding member includes a guide shoe having the guiding groove, and

the guide shoe includes a first elastic bent portion elastically engaged with the seat cushion frame when the seat cushion frame is located at the first position thereof and a second elastic bent portion elastically engaged with the seat cushion frame when the seat cushion frame is located at the second position thereof.

9. A seat apparatus for a vehicle according to claim 8 , wherein

a space is provided between the guide shoe and the seat cushion frame when the seat cushion frame is located between the first position and the second position thereof.

10. A seat apparatus for a vehicle according to claim 9 , wherein

the first position of the seatback frame corresponds to a position of the seatback where an occupant is supported by the seatback,

and the second position of the seatback frame corresponds to a position of the seatback where the seatback is forwardly reclined and arranged longitudinally flatly with the seat cushion.

11. A seat apparatus for a vehicle according to claim 8 , further comprising:

an assembling surface formed around the sliding member of the seat cushion frame and protruding to the first and second elastic bent portions of the guide shoe so as to contact an inner side of an edge line of each of the first and second elastic bent portions.

12. A seat apparatus for a vehicle according to claim 1 , further comprising:

a seatback frame adapted to support a seatback of the vehicle and operated to move between a first position and a second position relative to the vehicle floor,

wherein the seatback frame is longitudinally arranged with the seat cushion frame when the seatback frame is located at the second position thereof and the seat cushion frame is located at the second position thereof.