US 12,454,205 B2
Shoulder adjusting mechanism for seat backrest
Shunqiang Lan, Shanghai (CN); Xun Tang, Shanghai (CN); Yueyun Chen, Shanghai (CN); Jie Liang, Shanghai (CN); and Yiliang Xu, Shanghai (CN)
Assigned to Yanfeng International Automotive Technology Co., Ltd., Shanghai (CN)
Appl. No. 18/560,581
Filed by Yanfeng International Automotive Technology Co., Ltd., Shanghai (CN)
PCT Filed Jun. 6, 2022, PCT No. PCT/CN2022/097215
§ 371(c)(1), (2) Date Nov. 13, 2023,
PCT Pub. No. WO2022/257896, PCT Pub. Date Dec. 15, 2022.
Claims priority of application No. 202121319747.5 (CN), filed on Jun. 11, 2021.
Prior Publication US 2024/0253536 A1, Aug. 1, 2024
Int. Cl. B60N 2/22 (2006.01); B60N 2/23 (2006.01); B60N 2/28 (2006.01)
CPC B60N 2/2222 (2013.01) [B60N 2/233 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A shoulder adjustment mechanism for a seat backrest, characterized in that the shoulder adjustment mechanism comprises:
an upper backrest frame and a lower backrest frame in an up-and-down arrangement, each of the upper backrest frame and the lower backrest frame including a first side and a second side opposing to each other in a left-right direction, a third side facing a seat, and a fourth side facing away from the seat;
a pair of first hinges hingedly connected to the first sides and the second sides of the upper backrest frame and the lower backrest frame and close to the third sides;
a pair of second hinges hingedly connected to the first sides and the second sides of the upper backrest frame and the lower backrest frame and close to the fourth sides, the lower backrest frame being provided with sliding grooves for allowing movement of the second hinges;
a first base fixed to the first side of the lower backrest frame through a fixing bolt, wherein a position where the fixing bolt is located forms a fixed position of the first base, and wherein the first base is provided with a first transverse hole in a transverse direction, and the first base is provided with a first rotating shaft located on a rim of the first transverse hole;
a first transmission structure rotatably mounted within the first transverse hole of the first base and in driving connection with a motor, wherein an edge of the first transmission structure is in rolling connection with the first rotating shaft, so that the first rotating shaft forms a rotating position of the first transmission structure, and wherein a spacing exists between the rotating position of the first transmission structure and the fixed position of the first base; and
a first lead screw in transmission connection with the first transmission structure, wherein a top portion of the first lead screw is connected with the second hinge, and wherein the motor drives the first lead screw to move up and down through the first transmission structure, and accordingly the first lead screw brings the second hinges to move in the sliding grooves, thus realizing rotation of the upper backrest frame about the first hinges relative to the lower backrest frame.