US 12,402,718 B2
Toothbrush
Zhenwu Xu, Shanghai (CN); and Xiaoguo Dai, Shanghai (CN)
Assigned to SHANGHAI SHIFT ELECTRONICS CO., LTD., Shanghai (CN)
Appl. No. 18/044,790
Filed by SHANGHAI SHIFT ELECTRICS CO., LTD., Shanghai (CN)
PCT Filed Apr. 26, 2022, PCT No. PCT/CN2022/089200
§ 371(c)(1), (2) Date Mar. 10, 2023,
PCT Pub. No. WO2022/247559, PCT Pub. Date Dec. 1, 2022.
Claims priority of application No. 202110578515.X (CN), filed on May 26, 2021.
Prior Publication US 2024/0008631 A1, Jan. 11, 2024
Int. Cl. A46B 5/00 (2006.01); A46B 9/04 (2006.01)
CPC A46B 5/007 (2013.01) [A46B 9/04 (2013.01); A46B 2200/1066 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A toothbrush, comprising:
a brush head linkage, a connecting mechanism and a toothbrush handle which are sequentially arranged from top to bottom, and a brushing structure for brushing teeth is connected to the brush head linkage;
the connecting mechanism comprises a first connector, a second connector and an elastic structural element connected to the second connector; one of the first connector and the second connector is connected to the toothbrush handle, and the other one is connected to the brush head linkage;
the first connector is rotatably connected to the second connector, and the axis of rotation is an oscillating reference line perpendicular to a vertical direction;
the elastic structural element comprises at least one return torsion spring, the at least one return torsion spring comprises a helix spring in a cylindrical form with an opening of the cylinder oriented in a direction parallel to an extension direction of the oscillating reference line, the helix spring is in stop fit with the second connector in a direction perpendicular to the oscillating reference line, and the at least one return torsion spring further comprises a first torsion bar and a second torsion bar respectively connected to a front end and a rear end of the helix spring; and a free end of the first torsion bar is in stop fit with the first connector, and a free end of the second torsion bar is in stop fit with the second connector.