US 12,440,031 B2
Back support for a chair
Mark Sherman, Zeeland, MI (US); William Schroeder, Jenison, MI (US); Weston Boerckel, Hudsonville, MI (US); William Reck, Muskegon, MI (US); and Adam VerBeek, Holland, MI (US)
Assigned to Haworth, Inc., Holland, MI (US)
Filed by Haworth, Inc., Holland, MI (US)
Filed on Sep. 1, 2022, as Appl. No. 17/901,105.
Prior Publication US 2024/0074587 A1, Mar. 7, 2024
Int. Cl. A47C 7/46 (2006.01); A47C 7/18 (2006.01); A47C 7/40 (2006.01)
CPC A47C 7/462 (2013.01) [A47C 7/18 (2013.01); A47C 7/402 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A back support for an office type chair, comprising:
a support frame;
a rear shell mounted to the support frame, the rear shell having a rear surface facing the support frame, and a front surface opposite the rear surface, the rear shell defining a lumbar region;
a front shell having a rear surface facing the rear shell and a front surface opposite the rear surface, the front shell rear surface attached to the rear shell front surface;
a cushion having a rear surface facing the front shell and a front surface opposite the rear surface; and
a cover positioned over the front surface of the cushion, wherein at least a portion of the cover wraps around the cushion and is inserted between the front shell and the rear shell;
including a lumbar pad positioned between the rear shell and the front shell;
wherein the lumbar pad is vertically adjustable within the lumbar region;
wherein the rear shell defines an opening in the lumbar region, the rear shell opening having a vertical extent, the back support including a handle adjacent to the rear surface of the rear shell and having a portion extending through the rear shell opening, the portion attached to the lumbar pad, wherein the handle is movable along the vertical extent of the rear shell opening, and wherein movement of the handle causes corresponding movement of the lumbar pad;
wherein at least one lumbar enhancement rib protrudes from the rear surface of the front shell toward the rear shell, the lumbar pad engaging the lumbar enhancement rib at least at one position during the vertical adjustment of the lumbar pad.