US 11,701,989 B2
Reversible headrest
Yaowei Cao, Shanghai (CN); Min Zhu, Shanghai (CN); Xia Li, Shanghai (CN); and Donghai Xu, Shanghai (CN)
Assigned to YANFENG INTERNATIONAL SEATING SYSTEMS CO., LTD., Shanghai (CN)
Appl. No. 17/600,007
Filed by Yanfeng International Seating Systems Co., LTD., Shanghai (CN)
PCT Filed Mar. 6, 2020, PCT No. PCT/CN2020/078185
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/220826, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 201910350795.1 (CN), filed on Apr. 28, 2019.
Prior Publication US 2022/0105844 A1, Apr. 7, 2022
Int. Cl. B60N 2/841 (2018.01); B60N 2/856 (2018.01)
CPC B60N 2/841 (2018.02) [B60N 2/856 (2018.02)] 8 Claims
OG exemplary drawing
 
1. A turnable headrest, comprising a headrest body and a headrest rod, wherein the headrest body is wrapped around and hinged to a horizontal rod of the headrest rod, and two vertical rods of the headrest rod are inserted into a seat, the turnable headrest further comprising:
a fixed tooth, fixed to the horizontal rod of the headrest rod and located in the headrest body, wherein a headrest body locking portion, a headrest body rotary tooth portion, and a turned headrest body locking portion are disposed on the fixed tooth;
a torsion spring, sleeved on the horizontal rod of the headrest rod and located in the headrest body, wherein one end of the torsion spring acts on the fixed tooth, and another end of the torsion spring acts on the headrest body;
a rotary tooth, axially disposed in the headrest body, wherein the rotary tooth has a rotary tooth portion, when the rotary tooth portion is mated with the headrest body locking portion on the fixed tooth, the headrest body is locked at an initial use position, when the rotary tooth portion is mated with the headrest body rotary tooth portion on the fixed tooth, the headrest body is at a turnable position, and when the rotary tooth portion is mated with the turned headrest body locking portion on the fixed tooth, the headrest body is locked at a flat position; and
an elastic reset element, wherein one end of the elastic reset element acts on the rotary tooth, another end of the elastic reset element acts on the headrest body, and the elastic reset element is configured to push the rotary tooth portion on the rotary tooth such that a specific contact pressure always exists between the rotary tooth portion on the rotary tooth and the headrest body locking portion, the headrest body rotary tooth portion, and the turned headrest body locking portion on the fixed tooth;
wherein the fixed tooth comprises a sector-shaped notch, the sector-shaped notch is formed by a first fixed tooth convex circular arc and a first locking straight side and a locking concave arc side that are located on two ends of the first fixed tooth convex circular arc, the first locking straight side is adjacent to the rotary tooth portion of the fixed tooth, the first locking straight side and the first fixed tooth convex circular arc form a first locking concave corner, the rotary tooth portion of the fixed tooth is formed by a second convex circular arc, one end of the second convex circular arc is connected to the first locking straight side, the turned headrest body locking portion is formed by a second locking concave corner formed by another straight side and another end of the second convex circular arc, the rotary tooth portion of the rotary tooth is composed of a first locking arc, a slidably mated concave arc, and a second locking arc, one end of the first locking arc is connected to one end of the slidably mated concave arc, and the second locking arc is connected to another end of the slidably mated concave arc to form a locking convex corner with the other end of the slidably mated concave arc, wherein, when the rotary tooth portion is mated with the locking portion on the fixed tooth, the first locking arc and the second locking arc of the rotary tooth abut the locking concave arc side and the first locking straight side of the sector-shaped notch on the fixed tooth, respectively.