| CPC A63B 21/075 (2013.01) [A63B 21/0726 (2013.01); A63B 21/0728 (2013.01); A63B 71/0036 (2013.01)] | 17 Claims |
|
1. A weight-adjustable dumbbell, comprising:
a plurality of dumbbell plates;
a base for holding the plurality of dumbbell plates;
a positioning shaft;
a handle, movably sleeved on the positioning shaft;
a plurality of cam structures, disposed on two ends of the handle respectively; and
two driving plates, disposed between the handle and the plurality of cam structures on the two ends of the handle respectively, wherein the handle drives the plurality of cam structures to rotate on the positioning shaft through the two driving plates;
wherein one side of one of the plurality of cam structures is provided with a first connecting neck, the first connecting neck comprises a first supporting portion and a first connecting portion, an outer contour of the first connecting portion is a polygonal structure, an inner contour of the first connecting portion is a circular structure, and the other side of the one of the plurality of cam structures is provided with a first polygonal connecting slot;
wherein one side of each of the two driving plates close to the plurality of cam structures is provided with a second polygonal connecting slot capable of being engaged with the polygonal structure of the first connecting portion;
wherein two ends of the positioning shaft are respectively provided with a control device, the control device on each end of the positioning shaft is connected to the plurality of cam structures to control the plurality of cam structures rotating relatively with the plurality of dumbbell plates;
wherein each of the control devices comprises a gear ring assembly, a spring-control block, a bridge block, and a first fixing plate;
wherein for each of the control devices:
the gear ring assembly is sleeved on a respective end of the positioning shaft and connected to one of the plurality of cam structures;
the spring-control block is disposed at a lower end of the gear ring assembly for locking the gear ring assembly;
the first fixing plate is rotatably sleeved at a respective end of the handle; and
one end of the bridge block is fixedly connected to the gear ring assembly, and the other end of the bridge block is fixedly connected to the first fixing plate;
wherein the gear ring assembly comprises an inner fixing plate, a gear ring, and a gear ring fixing plate;
the inner fixing plate is provided with a pair of first limiting slots and a first annular protrusion, one side of the first limiting slot close to a center of the inner fixing plate is provided with a first opening, and a circular limiting slot is formed in the first annular protrusion;
the gear ring fixing plate is rotatably connected to the inner fixing plate, one side of the gear ring fixing plate close to the plurality of cam structures is provided with a second connecting neck, the second connecting neck comprises a second supporting portion and a second connecting portion, an outer contour of the second connecting portion is a regular polygon and an inner contour of the second connecting portion is a circle, and the inner fixing plate is rotatably sleeved on the second supporting portion; and
the gear ring is disposed in the circular limiting slot and fixedly connected to the gear ring fixing plate, an outer circumference of the gear ring is sequentially provided with a plurality of outer recesses, and an inner circumference of the gear ring is sequentially provided with a plurality of inner recesses.
|