US 12,290,713 B2
Rotary dumbbell
Lihui Wang, Fujian (CN)
Assigned to Hao's Fitness Equipment (Shanghai) Co., Ltd. Trading Ltd., Shanghai (CN)
Filed by Hao's Fitness Equipment (Shanghai) Co., Ltd. Trading Ltd., Shanghai (CN)
Filed on Nov. 3, 2022, as Appl. No. 17/980,305.
Application 17/980,305 is a continuation of application No. PCT/CN2020/105140, filed on Jul. 28, 2020.
Claims priority of application No. 202021426012.8 (CN), filed on Jul. 20, 2020.
Prior Publication US 2023/0052772 A1, Feb. 16, 2023
Int. Cl. A63B 21/075 (2006.01); A63B 21/072 (2006.01)
CPC A63B 21/075 (2013.01) [A63B 21/0726 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A rotary dumbbell, comprising a handle part (10) and weight parts (20) arranged at two ends of the handle part (10) respectively, and further comprising a transmission self-locking mechanism (30) and a driven mechanism (40) which are arranged at the two ends of the handle part (10) respectively and abut against the two weight parts (20) respectively; wherein
the transmission self-locking mechanism (30) comprises a transmission assembly (35); the transmission assembly (35) comprises a planetary gear transmission mechanism (351), a first output screw (352), a long nut (353) in matched connection with the first output screw (352), and a first screw spline (354) splined to the first output screw (352); the long nut (353) is rotatably connected to the planetary gear transmission mechanism (351) to enable the long nut (353) to rotate under the drive of the planetary gear transmission mechanism (351), so that the first output screw (352) moves axially through the first screw spline (354).