Slouch seat with link arm
A vehicle seat includes a seat base and a backrest. A seat base track arrangement has a fixed track and a moveable track that is moveable along the fixed track. The seat base fixed track is connected to a vehicle seat support or fore/aft track to adjust an entire vehicle seat position. The seat base moveable track is connected to the seat base. A backrest track arrangement has a backrest fixed track and a backrest moveable track that is moveable along the backrest fixed track. The backrest fixed track is connected to a vehicle backrest support. A link arm pivotably links the seat base and the backrest. A seat base pivot connection is formed between the link arm and the seat base. A link arm and backrest pivot connection is formed between the link arm and the backrest and the moveable track.
1. A vehicle seat comprising:
a seat base;
a backrest;
a seat base track arrangement comprising a fixed track and a moveable track, wherein the moveable track is moveable along the fixed track, the fixed track being connected to a vehicle seat support and the moveable track being connected to the seat base;
a backrest track arrangement comprising a backrest fixed track and a backrest moveable track, wherein the backrest moveable track is moveable along the backrest fixed track, the backrest fixed track being connected to a vehicle backrest support;
a link arm;
a seat base pivot connection between the link arm and the seat base; and
a link arm and backrest pivot connection between the link arm and the backrest and the backrest moveable track, wherein the link arm and backrest pivot connection comprises:
a link arm bushing;
a backrest bushing; and
a track bracket fixed to the backrest moveable track, the track bracket having a pivot shaft engaging the link arm bushing for pivoting movement of the link arm relative to the track bracket and engaging the backrest bushing for pivoting movement of the backrest relative to the track bracket.
2. A vehicle seat according to claim 1 , wherein:
the link arm defines the link arm bushing and a further link arm bushing;
the backrest has the backrest bushing and a further backrest bushing;
the track bracket comprises a first bracket flange supporting the pivot shaft that engages the link arm bushing the backrest bushing and a second bracket flange supporting a further pivot shaft that engages the further link arm bushing and the further backrest bushing.
3. A vehicle seat according to claim 1 , wherein:
the link arm comprises a right side link arm portion with a right lower link arm extending along a portion of a length of the seat base to a link arm right lower pivot bushing adjacent to an H-point along the length of the seat base;
the link arm comprises a left side link arm portion with a left lower link arm extending along a portion of a length of the seat base to a link arm left lower pivot bushing adjacent to the H-point along the length of the seat base;
the seat base comprises a frame part with a connected seat base right side pivot bushing and a connected seat base left side pivot bushing;
the seat base pivot connection comprises a right side seat base pivot connection with a right pivot shaft supported by said link arm right lower pivot bushing and said seat base right side pivot bushing; and
the seat base pivot connection comprises a left side seat base pivot connection with a left pivot shaft supported by said link arm left lower pivot bushing and said seat base left side pivot bushing.
4. A vehicle seat according to claim 3 , wherein:
the right side link arm portion forms a right side bolster with bolster foam and trim connected to the right side link arm portion; and
the left side link arm portion forms a left side bolster with bolster foam and trim connected to the left side link arm portion.
5. A vehicle seat according to claim 3 , wherein:
the backrest has a side profile shape;
the right side link arm portion has a side profile shape following the side profile shape of the backrest; and
the left side link arm portion has a side profile shape following the side profile shape of the backrest.
6. A vehicle seat according to claim 3 , wherein the link arm with the link arm and backrest pivot connection, the right side seat base pivot connection, and the left side seat base pivot connection, cooperates with the seat base track arrangement and the backrest track arrangement to form a balanced system.
7. A vehicle seat according to claim 6 , wherein the a travel ratio between the seat track arrangement and the backrest track arrangement is between 1.8:1 and 2.2:1.
8. A vehicle seat according to claim 6 , wherein the a travel ratio between the seat track arrangement and the backrest track arrangement is about 2:1.
9. A vehicle seat according to claim 6 , wherein the backrest is a live back seat back comprising a plastic panel that flexes with back movement.
10. A vehicle seat according to claim 9 , wherein the live back seat back is pivotably connected to the track bracket, via the link arm and backrest pivot connection, independently of the pivot connection of the link arm to the track bracket, via the link arm and backrest pivot connection.
11. A vehicle seat according to claim 10 , wherein the live back seat back is moveably connected to the link arm at a lower sliding link arm and backrest connection.
12. A vehicle seat according to claim 6 , wherein the backrest includes a rigid seat back structure comprising a shell or a frame.
13. A vehicle seat according to claim 2 , wherein:
the seat base track arrangement further comprises a further fixed track and a further moveable track that is moveable along the further fixed track, the further fixed track being connected to the vehicle seat support and the moveable track being connected to the seat base; and
the backrest track arrangement comprises only the backrest fixed track as a single fixed track and the only the backrest moveable track as a single backrest moveable track to provide a single track arrangement supporting movement of the backrest.
14. A vehicle seat according to claim 13 , wherein:
each moveable track of the seat base track arrangement extends laterally with bearings at lateral sides; and
each fixed track of the seat base track arrangement engages bearings at the lateral sides of the respective associated moveable track.
15. A vehicle seat according to claim 13 , wherein:
the single moveable track of the backrest track arrangement extends laterally with bearings at lateral sides; and
the single fixed track of the backrest track arrangement engages bearings at the lateral sides of the single moveable track.
16. A vehicle comprising:
a vehicle seat support and vehicle backrest support;
a seat base;
a backrest;
a seat base track arrangement comprising a fixed track and a moveable track, the moveable track being moveable along the fixed track, the seat base track arrangement being connected between the vehicle seat support and the seat base for movement of the seat base relative to the vehicle seat support;
a backrest track arrangement comprising a backrest fixed track and a backrest moveable track, the backrest moveable track being moveable along the backrest fixed track, the backrest track arrangement being connected to the vehicle backrest support;
a link arm;
a seat base pivot connection between the link arm and the seat base; and
one of a link arm and backrest pivot connection between the link arm and the backrest and the moveable track, wherein the link arm and backrest pivot connection comprises:
a link arm bushing;
a backrest bushing; and
a track bracket fixed to the backrest moveable track, the track bracket having a pivot shaft engaging the link arm bushing for pivoting movement of the link arm relative to the track bracket and engaging the backrest bushing for pivoting movement of the backrest relative to the track bracket;
and a link arm and backrest pivot connection between the link arm and the backrest and the moveable track, wherein the link arm and backrest pivot connection comprises:
a link arm and backrest bushing; and
a track bracket fixed to the backrest moveable track, the track bracket having a pivot shaft engaging the link arm and backrest bushing for pivoting movement of the link arm and backrest relative to the track bracket.
17. A vehicle seat comprising:
a seat base;
a backrest;
a seat base track arrangement comprising a fixed track and a moveable track, which moveable track is moveable along the fixed track, the fixed track being connected to a vehicle seat support and the moveable track being connected to the seat base;
a backrest track arrangement comprising a backrest fixed track and a backrest moveable track, which backrest moveable track is moveable along the backrest fixed track, the backrest fixed track being connected to a vehicle backrest support;
a link arm;
a seat base pivot connection between the link arm and the seat base; and
a link arm and backrest pivot connection between the link arm and the backrest and the backrest moveable track, wherein the link arm is fixed to the backrest and the link arm and backrest pivot connection comprises:
a link arm and backrest bushing; and
a track bracket fixed to the backrest moveable track, the track bracket having a pivot shaft engaging the link arm and backrest bushing for pivoting movement of the link arm and backrest relative to the track bracket.