US 12,257,669 B2
Adjustable wrench
Weiyi Wang, Hangzhou (CN)
Assigned to Hangzhou United Tools Co., Ltd., (CN); and Hangzhou Great Star Industrial Co., Ltd, (CN)
Appl. No. 17/771,374
Filed by HANGZHOU UNITED TOOLS CO., LTD., Hangzhou (CN); and HANGZHOU GREAT STAR INDUSTRIAL CO., LTD., Hangzhou (CN)
PCT Filed Oct. 24, 2019, PCT No. PCT/CN2019/113040
§ 371(c)(1), (2) Date Sep. 30, 2024,
PCT Pub. No. WO2021/077359, PCT Pub. Date Apr. 29, 2021.
Prior Publication US 2022/0355445 A1, Nov. 10, 2022
Int. Cl. B25B 13/14 (2006.01)
CPC B25B 13/14 (2013.01) 10 Claims
OG exemplary drawing
 
1. An adjustable wrench, comprising a handle, a neck, a first jaw, a second jaw and an adjustment mechanism, wherein:
the first jaw is connected to the handle by the neck;
the second jaw is movably disposed on the neck and is disposed opposite the first jaw to form a holding space for holding an object;
the adjustment mechanism is disposed on the neck and is configured to be able to drive the second jaw to move relative to the first jaw to adjust a size of the holding space;
wherein the adjustment mechanism comprises a worm and a pin, and the worm comprises an inner tube and thread teeth;
the inner tube is of a cylinder and has an inner cavity penetrating in an axial direction;
the pin passes through the inner cavity and is fixedly connected to the neck;
the thread teeth are spirally disposed on an outer surface of the inner tube, and the thread teeth are arc-shaped with an arc surface at a top end of the thread teeth;
the second jaw meshes with the thread teeth and is configured to be able to move relative to the first jaw as the worm rotates; and
the thread teeth have more than one helix, and a lead angle of the worm is not greater than a self-locking angle, the self-locking angle corresponding to a material of the worm and the second jaw;
wherein the lead angle is an included angle between a circumference expanded from a pitch diameter of the thread teeth and the helix, and the lead angle is determined according to a formula:
tan a1=p/πd,
where a1 is the lead angle, p is a lead of the thread teeth, and d is a diameter of the worm;
wherein the thread teeth have two helices, and the lead angle is in a range of 7° to 8°.