US 12,357,867 B2
Chest expander
Jian Xu, Zhejiang (CN)
Filed by Jian Xu, Zhejiang (CN)
Filed on Oct. 31, 2023, as Appl. No. 18/385,394.
Claims priority of application No. 202320882660.1 (CN), filed on Apr. 14, 2023.
Prior Publication US 2024/0342542 A1, Oct. 17, 2024
Int. Cl. A63B 21/00 (2006.01); A63B 21/015 (2006.01); A63B 21/04 (2006.01); A63B 23/02 (2006.01)
CPC A63B 21/153 (2013.01) [A63B 21/015 (2013.01); A63B 21/0435 (2013.01); A63B 23/0244 (2013.01); A63B 2220/17 (2013.01); A63B 2220/833 (2013.01); A63B 2220/89 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A chest expander, comprising a shell, a rotating shaft, a winding storage wheel, an elastic member, and a pull strap, wherein the winding storage wheel is rotatably arranged in the shell, the pull strap is connected to the winding storage wheel, the elastic member drives the winding storage wheel to rotate to wind and store the pull strap, the rotating shaft is rotatably arranged in the shell and connected to the winding storage wheel by one-way transmission, and the pull strap can drive the rotating shaft to rotate when pulled out from the winding storage wheel,
characterized in that: the chest expander further comprises a resistance adjustment mechanism, and the resistance adjustment mechanism comprises a resistance wheel, an arc-shaped base strap, and a friction plate, wherein the resistance wheel is arranged on the rotating shaft, the arc-shaped base strap is made of an elastic deformable material, the arc-shaped base strap is arranged opposite to a peripheral surface of the resistance wheel, and the friction plate is arranged on an inner surface of the arc-shaped base strap and is in frictional contact with the peripheral surface of the resistance wheel; and one end of the arc-shaped base strap is fixedly connected to the shell, and the other end is movable and adjustable to adjust friction between the friction plate and the resistance wheel.