Dumbbell capable of multi-level weight adjustment
View Patent ↗The present invention discloses a multi-level adjustable dumbbell. It comprises a dumbbell bar assembly, multiple weight plates, and a base for storing them. The bar assembly includes a rotational adjustment mechanism and supports at both ends, each having an end support, a weight plate holder, and an adjustment frame. The adjustment mechanism, containing a handle tube, a guide shaft, and two slide pins A and B, enables weight adjustment. This is achieved by combining a specific weight plate B with multiple weight plates A via their respective insertion position. Featuring a universal outer profile with only aperture differences, the design allows for high-precision, reliable adjustment through a precision synchronized rack and pinion or magnetic encoding detection. Compared to existing art, this invention doubles the number of adjustable levels and enhances both precision and user convenience.
1 . A dumbbell capable of multi-level weight adjustment, comprising a dumbbell bar assembly, a plurality of weight plates, and a base for placing the weight plates and the dumbbell bar assembly, the dumbbell bar assembly including a single rotational adjustment mechanism and a pair of dumbbell supports disposed at respective ends of the rotational adjustment mechanism, each of the dumbbell supports comprising an end support, a weight plate holder, and an adjustment frame, characterized in that: the rotational adjustment mechanism comprises a handle tube, a pair of guide shafts, a pair of slide pins A, and a pair of slide pins B; each weight plate holder is provided with a plurality of weight plate A insertion positions with a weight plate B insertion position disposed inward thereof; each guide shaft passes through the handle tube, a central limiting slot of each weight plate holder, and each adjustment frame and is fixedly connected to the respective end support; each slide pin A is configured to move horizontally along an intermittent push track and each slide pin B is configured to move along a reciprocating push track, whereby the intermittent push track and the reciprocating push track enable multi-level weight combination adjustment; and the plurality of weight plates comprise at least one weight plate A and at least one weight plate B having a substantially identical outer profile differing in aperture size, the weight plate A and the weight plate B being configured to achieve synchronized weight adjustment via a synchronization mechanism.
2 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein self-locking notches are provided between both ends of the handle tube and the adjustment frame, a self-locking spring and a self-locking block are installed within the self-locking notches, and the self-locking block locks the adjustment frame and the handle tube in an unpressed state.
3 . The dumbbell capable of multi-level weight adjustment according to claim 2 , wherein the base is provided with an unlocking block corresponding to the adjustment frame positioning groove, configured to press down the self-locking block to unlock the adjustment frame and the handle tube when the dumbbell bar assembly is placed.
4 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein a weight adjustment dial is fixedly provided at each end of the handle tube and an anti-slip portion is disposed on the outer surface of the handle tube.
5 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein the end support comprises an outer sleeve and metal sheets filled therein and is fixedly connected to the guide shaft via bolts, and wherein the adjustment frame comprises a housing and metal sheets fixed on both sides of the weight plate holder via bolts.
6 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein the slide pin A is provided with a guide block that moves horizontally along the limiting slot of the weight plate holder, and the slide pin B is provided with a limit guide strip that moves horizontally along the limiting slot of the weight plate holder.
7 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein the base, the weight plate holder, and the adjustment frame adopt a modular structure design to facilitate assembly and maintenance.
8 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein a guide slot is provided between the adjustment frame and the weight plate holder for achieving precise alignment of the slide pins.
9 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein the cooperating portions between the slide pins and the handle tube are made of wear-resistant material to ensure long-term reliability.
10 . The dumbbell capable of multi-level weight adjustment according to claim 1 , wherein a motion state of the entire adjustment mechanism is detectable in real-time through a precision synchronized rack and pinion or magnetic encoding device to ensure accuracy of each weight level.