US 12,403,350 B2
Dumbbell and fitness equipment
Danni Wang, Ningbo (CN)
Filed by Danni Wang, Ningbo (CN)
Filed on Jul. 12, 2022, as Appl. No. 17/863,355.
Application 17/863,355 is a continuation in part of application No. 17/403,839, filed on Aug. 16, 2021, granted, now 11,458,348.
Prior Publication US 2023/0067188 A1, Mar. 2, 2023
Int. Cl. A63B 21/072 (2006.01)
CPC A63B 21/0728 (2013.01) 18 Claims
OG exemplary drawing
 
1. A dumbbell, comprising:
a first grip rod, comprising a body portion and two thread connection portions respectively disposed at two ends of the body portion; each of the two thread connection portions defines a first screw hole; wherein threads are arranged on only an inner hole wall of the first screw hole; an end surface of each of the two thread connection portions away from the body portion is recessed inwardly towards the body portion to form the first screw hole having the threads on the inner hole wall; an outer circumferential surface of each of the two thread connection portions is flushed with an outer circumferential surface of the body portion of the first grip rod; and
two counterweight assemblies, each of the two counterweight assemblies comprises at least one first counterweight, the at least one first counterweight comprises a first connection portion, the first connection portion is threadedly received in the respective first screw hole and connected to the threads on the inner hole wall of the respective first screw hole to connect the first grip rod with the at least one first counterweight;
wherein, each of the two counterweight assemblies further comprises a second counterweight, the second counterweight comprises a second connection portion, a second screw hole is defined in each of the at least one first counterweight, the second connection portion is threadedly received in the respective second screw hole; wherein the dumbbell further comprises at least two protecting elements, each protecting element of the at least two protecting elements is sleeved on respective first counterweight of the at least one counterweights adjacent to the first grip rod; and/or each protecting element of the at least two protecting elements is sleeved on respective first counterweight of the at least one counterweights farthest from the first grip rod.