Adjustable Dumbbell Locking Mechanism for Faster Weight Changes
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Solution Overview
Problem
Current weight-adjustable dumbbells require tedious and time-consuming processes for adjusting weights due to the need to repeatedly remove and install locking screws to add or remove dumbbell pieces.
Innovation Solution
A weight-adjustable dumbbell design featuring a rotating rod with hanging piece components and a limiting structure that allows quick replacement of dumbbell pieces by rotating the rod, utilizing gear mechanisms and elastic elements to secure or release the dumbbell pieces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If locking screws are used to secure dumbbell pieces on the center shaft, then the dumbbell pieces are firmly fixed, but the weight adjustment process becomes tedious and time-consuming
Solution Approach 1:
The locking mechanism is divided into multiple independent locking blocks (first locking block, second locking block, third locking block) that can independently engage with corresponding grooves on different dumbbell pieces. This segmentation allows for more efficient locking without requiring a single complex locking screw, thereby reducing adjustment time while maintaining secure fixation.
Solution Approach 2:
Instead of using a threading mechanism where the locking screw must be rotated multiple times to tighten, the patent uses a direct engagement mechanism where locking blocks simply need to be moved along guide slopes to engage with grooves. This inverts the traditional locking approach from rotational tightening to linear engagement, dramatically reducing the time and effort required for weight adjustment.
2Reliability
If multiple locking screws are used to secure multiple dumbbell pieces, then the fixation is reliable, but the device complexity increases
Solution Approach 1:
Multiple locking functions are merged into a single integrated locking mechanism. The first locking block, second locking block, and third locking block are all part of the same locking assembly that moves together along the guide slopes. This merging reduces the number of separate components and simplifies the overall structure while maintaining reliable fixation of multiple dumbbell pieces.
Solution Approach 2:
The locking mechanism is designed with multi-functionality where the same locking blocks and guide slopes serve multiple purposes: guiding the locking blocks during movement, providing the locking engagement path, and ensuring proper positioning. This universality reduces the need for separate guiding structures and simplifies the overall design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables rapid weight adjustment by simply rotating the rod, saving time and effort in changing the weight settings.
Implementation Method 1
an elastic element is arranged on the outer periphery of the limiting column
Data Source
AI summary
A weight-adjustable dumbbell, includes a dumbbell frame, a plurality of hanging piece components and dumbbell pieces matching with the hanging piece components, wherein a rotating rod is provided on the dumbbell frame's middle position, and the hanging piece components are arranged symmetrically on both ends of the dumbbell frame. The hanging piece components on the same end are arranged at intervals and in linkage connection with each other. Two hanging piece components, which are on both ends and close to the dumbbell frame's middle position, are in linkage connection with the rotating rod. The hanging piece component includes a gear shaft and a limiting structure. The rotating rod is provided with clamping blocks on its both ends. One side of the gear shaft is provided with slots, which cooperate with the clamping blocks to realize the interaction between the rotating rod and the gear shaft.