US 12,426,714 B2
Chair with adjustable back depth
Xijian Li, Zhongshan (CN)
Assigned to Zhongshan Donati Co., Ltd, Zhongshan (CN)
Filed by Zhongshan Donati Co., Ltd, Zhongshan (CN)
Filed on Oct. 13, 2023, as Appl. No. 18/379,980.
Claims priority of application No. 202310983403.1 (CN), filed on Aug. 4, 2023.
Prior Publication US 2025/0040716 A1, Feb. 6, 2025
Int. Cl. A47C 7/44 (2006.01)
CPC A47C 7/441 (2013.01) [A47C 7/446 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A chair with an adjustable back depth, comprising a chassis, a seat plate, a back plate, a hinge seat, a pneumatic rod, a trigger piece, a drive piece, a support seat frame, and rocking bars, wherein
the chassis comprises an accommodating cavity and two support plates arranged at a rear end;
the hinge seat comprises a hinge cavity and a rod channel communicated with the hinge cavity;
the support seat frame comprises a bottom hinge cavity and two frame poles, and the two frame poles are hollow, have a front opening, and are communicated with the bottom hinge cavity;
the rocking bars are arranged between an upper hinge plate and a lower hinge plate; a connecting seat is arranged on a rear surface of a back plate; the connecting seat has two hinge grooves with rear openings and lower openings;
the seat plate is fixed to the chassis; the hinge seat is arranged in the accommodating cavity; inner sides of lower ends of the two frame poles are hinged to a rear hinge hole of the two support plates; the lower hinge plate is hinged to a front hinge hole of the two support plates; the rocking bars are embedded into the two frame poles; outer sides of upper ends of the two frame poles are hinged to a rear end of one of the two hinge grooves; the upper hinge plate is hinged to a front end of one of the two hinge grooves; a main body of the pneumatic rod is hinged to the bottom hinge cavity; a piston rod is hinged to the hinge cavity; the trigger piece is hinged to the hinge seat and cooperates with an execution push rod of the pneumatic rod; and the drive piece is arranged on the chassis and cooperates with the trigger piece.