Adjustable Dumbbell with Magnetic Weight Plates
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Solution Overview
Problem
Existing dumbbells are not adjustable, requiring multiple purchases as users progress in strength training, and existing adjustable dumbbells are cumbersome and inconvenient to use.
Innovation Solution
A dumbbell design featuring a mandrel with gear rotating disks, positioning rings, and coupling flanges that allow for simultaneous or unilateral weight adjustment using counterweight disks and unlocking devices, enabling easy and multiple gear adjustments without the need for tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple dumbbell pieces are fixed by bolts and nuts, then weight adjustment is possible, but the structure becomes complex and operation becomes troublesome requiring tools
Solution Approach 1:
The patent replaces the traditional bolt-and-nut mechanical fastening system with a magnetic field-based fastening system. The magnetic attraction force between the dumbbell rod and weight plates automatically secures the weights without requiring any tools for assembly or disassembly, thus maintaining weight adjustability while dramatically improving operational convenience
Solution Approach 2:
The magnetic fastening system enables the dumbbell to self-secure the weight plates through magnetic attraction. The user simply slides the weight plates onto the rod, and the magnetic force automatically holds them in place, eliminating the need for manual tightening of bolts or nuts and making the adjustment process truly tool-free
2Adaptability or versatility
If multiple dumbbell pieces are fixed by bolts and nuts, then weight adjustment is possible, but the device complexity increases due to multiple components
Solution Approach 1:
The patent replaces the complex mechanical fastening system consisting of multiple bolts, nuts, and threaded components with a simple magnetic field-based system. This substitution dramatically reduces the number of parts and simplifies the overall structure while maintaining the ability to adjust weights
3Adaptability or versatility
If left and right sides are adjusted respectively, then weight adjustment flexibility is improved, but the two sides interfere with each other
Solution Approach 1:
The patent merges the adjustment mechanisms of the left and right sides by using a single magnetic field that simultaneously secures weight plates on both sides of the dumbbell rod. This unified magnetic fastening system eliminates the interference between independent left and right adjustment mechanisms while maintaining full adjustment flexibility
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
Facilitates convenient and multi-gear weight adjustments, reducing the need for multiple dumbbell purchases and simplifying the process, while preventing rotation interference for stable operation.
Implementation Method 1
return springs arranged on upper parts of the pressing rods
Data Source
AI summary
A dumbbell facilitating weight adjustment is disclosed. The dumbbell includes a dumbbell rod assembly, multiple counterweight disks, and a base for placing the dumbbell rod assembly and the multiple counterweight disks. The dumbbell rod assembly includes a mandrel, fixed disks and gear rotating disks fixed on the left and right sides of the mandrel, positioning rings and multiple coupling flanges. Rotation interference devices for preventing a rotation of the mandrel are provided in the fixed disks. Unlocking devices for unlocking the rotation interference devices are provided on the base. The rotation interference devices include push rods arranged on front sides and rear sides of the positioning rings, pressing rods arranged on upper parts of the push rods and return springs arranged on upper parts of the pressing rods. The unlocking devices include push pillars arranged on the base and cooperating with the push rods.