Lumbar support adjustment mechanisms
A lumbar support adjustment system for a chair that allows a user to adjust the lumbar support by moving a handle on the side of the chair back. The lumbar support and handle move along separate tracks that diverge from each other as the lumbar support is adjusted upward. To compensate for this divergence, the system includes a linkage with a joint connected to the handle and another joint connected to the lumbar support. As the lumbar support is adjusted, the linkage and joint system accommodates for the divergence of the tracks to continue transmitting force from the handle to adjust the lumbar support.
1. A chair comprising:
legs connected to a seat;
a chair back connected to the seat;
a lumbar support that is engaged with a first track, wherein the lumbar support follows and travels along the first track, and the first track is oriented vertically on the chair back, the lumbar support engaged with the first track to only allow translational movement of the lumbar support with respect to the first track;
a handle that is engaged with a second track wherein the first track diverges from the second track, the handle engaged with the second track to only allow translational movement of the handle with respect to the second track;
a lumbar-side linkage retainer connected to the lumbar support;
a handle-side linkage retainer is connected to the handle; and
a linkage with a lumbar joint and a handle joint, and wherein the lumbar joint is connected to the lumbar-side linkage retainer and the handle joint is connected to the handle-side linkage retainer wherein the lumbar joint and handle joint are configured to individually permit rotational movement but not translational movement.
2. The chair of claim 1 wherein the first track follows a vertical path.
3. The chair of claim 2 , wherein the second track follows a path near the edge of the seat back.
4. The chair in claim 1 , wherein the handle-side linkage retainer is integrated into the handle to form one piece.
5. The chair in claim 1 , wherein there is an additional lumbar-side linkage retainer connected to the lumbar support to retain the linkage.
6. A lumbar support adjustment system for a chair comprising:
a lumbar support that is engaged with a first track that follows and travels along a first path that is oriented vertically along a chair back, the lumbar support engaged with the first track to only allow translational movement of the lumbar support with respect to the first track;
a handle engaged with a second track that follows a path that diverges from the first path, the handle engaged with the second track to only allow translational movement of the handle with respect to the second track;
a linkage with a lumbar joint and a handle joint, wherein the lumbar joint is connected to the lumbar support and the handle joint is connected to the handle wherein the lumbar joint and handle joint are individually configured to permit rotational movement but not translational movement.
7. The lumber support adjustment system of claim 6 , wherein a lumber side linkage retainer connects the lumbar support to the linkage.
8. The lumber support adjustment system of claim 6 , wherein a handle side linkage retainer connects the linkage to the handle.
9. The lumbar support adjustment system of 6 , wherein the lumbar joint is an open ring joint.
10. The lumbar support adjustment system of claim 6 , wherein the lumbar joint is a ball and socket joint.
11. The lumbar support adjustment system of claim 6 , wherein the lumbar joint is a hinge joint.
12. The lumbar support adjustment system of claim 6 , wherein the handle joint is an open ring joint.
13. The lumbar support adjustment system of claim 6 , wherein the handle joint is a ball and socket joint.
14. The lumbar support adjustment system of claim 6 , wherein the handle joint is a pin and slider joint.
15. A lumbar support adjustment system for a chair comprising:
a lumbar support that is engaged with a first track that follows and travels along a first path that is oriented vertically along a chair back, the lumbar support engaged with the first track to only allow translational movement of the lumbar support with respect to the first track;
a handle that is engaged with a second track that follows a second path near an edge of the chair back and wherein the second path diverges from the first path, the handle engaged with the second track to only allow translational movement of the handle with respect to the second track;
a linkage with a lumbar joint and a handle joint, and wherein the lumbar joint is connected to the lumbar support and the handle joint is connected to the handle, wherein the lumbar joint and handle joint are individually configured to permit rotational movement but not translational movement.
16. The lumber support adjustment system of claim 15 , wherein a lumber side linkage retainer connects the lumbar support to the linkage.
17. The lumbar support adjustment system of claim 16 , wherein the lumber-side linkage retainer incorporates a socket portion of the open ring joint.
18. The lumbar support adjustment system of claim 16 , wherein the lumbar joint incorporates a ring portion of the open ring joint.
19. The lumbar support adjustment system of claim 16 , wherein the lumber-side linkage retainer incorporates a ring portion of the open ring joint.
20. The lumbar support adjustment system of claim 16 , wherein the lumbar joint incorporates a socket portion of the open ring joint.
21. The lumbar support adjustment system of claim 16 , wherein a handle-side linkage retainer connects the linkage to the handle and wherein the handle side linkage retainer incorporates a socket portion of the open ring joint.
22. The lumber support adjustment system of claim 15 , wherein a handle side linkage retainer connects the linkage to the handle.
23. The lumbar support adjustment system of claim 15 , wherein the lumbar joint is a complementary portion of an open ring joint.
24. The lumbar support adjustment system of claim 15 , wherein the lumbar joint is a complementary portion of a ball and socket joint.
25. The lumbar support adjustment system of claim 15 , wherein the lumbar joint is a complementary portion of a hinge joint.
26. The lumbar support adjustment system of claim 15 , wherein the handle joint is a complementary portion of an open ring joint.
27. The lumbar support adjustment system of claim 15 , wherein the handle joint is a complementary portion of a ball and socket joint.
28. The lumbar support adjustment system of claim 15 , wherein the handle joint is a complementary portion of a hinge joint.
29. The lumbar support adjustment system of claim 15 , wherein the lumbar support is slidably engaged with the first track.
30. The lumbar support adjustment system of claim 15 , wherein the lumbar support includes rollers that are positioned to roll along the first track.