Slouch seat with seat base tilt
A vehicle seat includes a cushion, a seatback connected to the cushion and a track arrangement. The track arrangement includes a curved fixed track and a flexible track follower that is moveable along the curved fixed track between a full slouch and a full upright position. The curved fixed track is connected to a vehicle seat support base and the moveable track is connected to the cushion.
1. A vehicle seat comprising:
a cushion;
a seatback connected to the cushion; and
a track arrangement comprising a stationary curved fixed track and a movable track/ball bearing and cage track follower that is moveable along the stationary curved fixed track between a full slouch and a full upright position, the stationary curved fixed track being connected to a stationary vehicle seat support base and the moveable track/ball bearing and cage track follower being connected to the cushion.
2. A vehicle seat according to claim 1 , further comprising:
a link arm;
a cushion pivot connection between the link arm and the cushion; and
a link arm and seatback pivot connection between the link arm and the seatback and the moveable track.
3. A vehicle seat according to claim 1 , further comprising a cushion frame is connected to the movable track/ball bearing and cage track follower, wherein the cushion is pivotably mounted to the cushion frame at a cushion pivot.
4. A vehicle seat according to claim 3 , further comprising a cushion tilt angle guide connected to the cushion and connected to the seat support to control a tilt angle of the cushion relative to the cushion pivot, during movement between the full slouch position and the full upright position, wherein the seatback is connected to the cushion for movement of the seatback between the full slouch position and the full upright position.
5. A vehicle seat according to claim 4 , wherein the cushion tilt angle guide comprises a bracket defining a slot and a pin fixed to the cushion and following a path of the slot for limiting a pivot tilt of the cushion about the cushion pivot during movement between the full slouch position and the full upright position.
6. A vehicle seat according to claim 4 , wherein the cushion tilt angle guide comprises a front track and a movable front track/ball bearing and cage track follower connected to the front track for following a path of the front track, the cushion being pivotably connected to the movable front track/ball bearing and cage track follower for limiting a pivot tilt of the cushion about the cushion pivot during movement between the full slouch position and the full upright position.
7. A vehicle seat according to claim 4 , wherein the cushion tilt angle guide comprises a linear actuator pivotably connected to the cushion and pivotably connected to the cushion frame for setting a pivot tilt of the cushion about the cushion pivot during movement between the full slouch position and the full upright position.
8. A vehicle seat according to claim 3 , wherein: the backrest is fixed to a backrest support comprising a back frame; the back frame is fixed to the cushion frame for movement therewith; the cushion frame carries rollers; and
the vehicle seat support comprises a curved roller support surface on which the roller roll to support the cushion frame and the back frame.
9. A vehicle seat according to claim 8 , wherein from the full upright to the full slouch position the back frame tilts rearward and the cushion tilts upward about the cushion pivot.
10. A vehicle seat according to claim 8 , wherein from the full slouch position to the full upright position the back frame tilt forward and cushion tilts downward about the cushion pivot.
11. A vehicle seat according to claim 3 , wherein the cushion is spring biased toward a tilt angle with respect to the cushion pivot.
12. A vehicle seat according to claim 1 , wherein the stationary curved fixed track provides a cushion tilt, during movement between the full slouch position and the full upright position, to follow a movement of an occupant's legs, during movement between the full slouch position and the full upright position, when a same heel point is maintained.
13. A vehicle seat according to claim 1 , further comprising a linear locking device with a pivot connection to the vehicle seat support and a pivot connection to the cushion.
14. A vehicle seat according to claim 1 , wherein the movable track/ball bearing and cage track follower has at least a portion that is flexible between ball bearing cages to match a curve of the curved track.
15. A vehicle seat according to claim 1 , wherein the track arrangement comprises:
two fixed curved tracks at one side of the vehicle seat and two fixed curved tracks at another side of the vehicle seat; and
a movable front track/ball bearing and cage track follower that is moveable along each of the two fixed curved tracks on each side of the vehicle seat between a full slouch and a full upright position.
16. A vehicle seat according to claim 1 , wherein the cushion is spring biased toward one of the full slouch and a full upright position.
17. A vehicle seat comprising:
a cushion;
a seatback connected to the cushion;
a track arrangement comprising a stationary curved fixed track and a movable track/ball bearing and cage track follower that is moveable along the stationary curved fixed track between a full slouch and a full upright position, the stationary curved fixed track being connected to a stationary vehicle seat support base and the moveable track/ball bearing and cage track follower being connected to the cushion,
a link arm;
a cushion pivot connection between the link arm and the cushion; and
a link arm and seatback pivot connection between the link arm and the seatback and the moveable track.