Vehicle seat with back suspension and seating surface adjustment

1. A vehicle seat comprising a backrest portion and a seating surface portion, each of which is arranged to be connected with a seat base portion,

wherein the backrest portion is resiliently arranged and supported to be able to swivel with respect to the seat base portion,

wherein the seating surface portion is arranged to be able to move in at least a longitudinal direction of the seat frontwards- and rearwards with respect to the seat base portion,

wherein the backrest portion and the seating surface portion are operatively connected together via a first lever arrangement in such a way that the seating surface portion is able to move rearwards in the longitudinal direction of the seat when the backrest portion makes a suspending movement with respect to the seat base portion in a direction away from the seating surface portion,

wherein, when the suspending movement is made with respect to the seat base portion, the backrest portion is able to swivel around an imaginary rotational axis extending in the lateral direction of the seat, and

wherein a second lever arrangement is arranged between the backrest portion and the seat base portion, the second lever arrangement being swivellably connected with the backrest portion by way of a first axis and swivellably connected with the seat base portion by way of a second axis.

2. The vehicle seat according to claim 1 , wherein a first degree of inclination of the backrest portion is adjustable with respect to the seating surface portion by way of rotational movement of the backrest portion around the first axis.

3. The vehicle seat according to claim 2 , wherein a position of the seating surface portion is adjustable frontwards in the longitudinal direction of the seat when the backrest portion moves around the first axis in a direction away from the seating surface portion.

4. The vehicle seat according to claim 1 , wherein the second lever arrangement comprises:

a first lever element, which is swivellably connected with the backrest portion by way of the first axis,

a second lever element, which is swivellably connected with the seat base portion by way of the second axis,

a third lever element, which is swivellably connected with the first lever element by way of a third axis and, by way of a fourth axis, swivellably connected with the second lever element, and

a fourth lever element, which is swivellably connected with the first lever element by way of a fifth axis and swivellably connected with the second lever element by way of a sixth axis, wherein a distance between the first axis and the third axis is variable such that a position of the imaginary rotational axis is adjustable in the vertical direction of the seat.

5. The vehicle seat according to claim 1 , wherein a second degree of inclination is variable between a second lever element of the second lever arrangement and the seat base portion, as a result of which a position of the imaginary rotational axis is adjustable in the longitudinal direction of the seat.

6. The vehicle seat according to claim 1 , wherein adjustment of a position of the imaginary rotational axis takes place manually or automatically by way of an electric or pneumatic drive element.

7. The vehicle seat according to claim 2 , wherein the second lever arrangement comprises:

a first lever element, which is swivellably connected with the backrest portion by way of the first axis,

a second lever element, which is swivellably connected with the seat base portion by way of the second axis,

a third lever element, which is swivellably connected with the first lever element by way of a third axis and, by way of a fourth axis, swivellably connected with the second lever element, and

a fourth lever element, which is swivellably connected with the first lever element by way of a fifth axis and swivellably connected with the second lever element by way of a sixth axis, wherein a distance between the first axis and the third axis is variable such that a position of the imaginary rotational axis is adjustable in the vertical direction of the seat.

8. The vehicle seat according to claim 2 , wherein a second degree of inclination is variable between a second lever element of the second lever arrangement and the seat base portion, as a result of which a position of the imaginary rotational axis is adjustable in the longitudinal direction of the seat.

9. The vehicle seat according to claim 2 , wherein the first lever arrangement comprises a first lever element rigidly connected with the first axis as well as a second lever element, which is swivellably connected with the first lever element and which is in turn swivellably connected with the seating surface portion.

10. The vehicle seat according to claim 3 , wherein a second degree of inclination is variable between a second lever element of the second lever arrangement and the seat base portion, as a result of which a position of the imaginary rotational axis is adjustable in the longitudinal direction of the seat.

11. The vehicle seat according to claim 3 , wherein the first lever arrangement comprises a first lever element rigidly connected with the first axis as well as a second lever element, which is swivellably connected with the first lever element and which is in turn swivellably connected with the seating surface portion.

12. The vehicle seat according to claim 7 , wherein adjustment of the position of the imaginary rotational axis takes place manually or automatically by way of an electric or pneumatic drive element.

13. The vehicle seat according to claim 7 , wherein the position of the imaginary rotational axis can be locked.

14. The vehicle seat according to claim 1 , wherein the position of the imaginary rotational axis can be locked.

15. The vehicle seat according to claim 2 , wherein adjustment of a position of the imaginary rotational axis takes place manually or automatically by way of an electric or pneumatic drive element.

16. The vehicle seat according to claim 2 , wherein a position of the imaginary rotational axis can be locked.

17. The vehicle seat according to claim 3 , wherein adjustment of a position of the imaginary rotational axis takes place manually or automatically by way of an electric or pneumatic drive element.

18. The vehicle seat according to claim 3 , wherein a position of the imaginary rotational axis can be locked.

19. The vehicle seat according to claim 1 , wherein the first lever arrangement comprises a first lever element rigidly connected with the first axis as well as a second lever element, which is swivellably connected with the first lever element and which is in turn swivellably connected with the seating surface portion.

20. A vehicle seat comprising a backrest portion and a seating surface portion, each of which is arranged to be connected with a seat base portion,

wherein the backrest portion is resiliently arranged and supported to be able to swivel with respect to the seat base portion,

wherein the seating surface portion is arranged to be able to move in at least a longitudinal direction of the seat frontwards and rearwards with respect to the seat base portion,

wherein the backrest portion and the seating surface portion are operatively connected together via a first lever arrangement in such a way that the seating surface portion is able to move rearwards in the longitudinal direction of the seat when the backrest portion makes a suspending movement with respect to the seat base portion in a direction away from the seating surface portion, and

wherein the first lever arrangement comprises a first lever element rigidly connected with a first axis as well as a second lever element, which is swivellably connected with the first lever element and which is in turn swivellably connected with the seating surface portion.