Adjustable Dumbbell Weight Selector Mechanism
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Solution Overview
Problem
Existing adjustable weight exercise devices for dumbbells lack simplicity and versatility in selecting different weight combinations, often requiring multiple types of weight plates and complex adjustment mechanisms.
Innovation Solution
A dumbbell design featuring a handle with integrated weight supporting sections and axial bars, where upwardly opening slots and L-shaped selectors allow for easy adjustment of weight by securing mass, with accessible selectors and a compact, adaptable mechanism for varying weight ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple types of weight plates and complex adjustment mechanisms are used, then weight selection versatility is improved, but device complexity increases
Solution Approach 1:
The patent employs a universal weight plate design where a single type of weight plate can be positioned at multiple locations (first and second weight supporting sections) to achieve various weight combinations. The L-shaped selector serves multiple functions: it selects weight plates, latches them in position, and provides operational access to both weight sections through its dual-ended design. This multi-functionality eliminates the need for multiple weight plate types and complex adjustment mechanisms.
Solution Approach 2:
The L-shaped selector is routed through the handle and positioned within the weight supporting sections, creating a nested arrangement where the selector is contained within the handle structure. The selector can be manipulated through slots in the weight plates, allowing weight selection without external complex mechanisms. This nesting approach simplifies the overall device structure while maintaining versatility.
2Adaptability or versatility
If multiple types of weight plates are used, then weight range coverage is improved, but ease of operation deteriorates
Solution Approach 1:
A single universal weight plate design replaces multiple specialized weight plates, allowing users to achieve various weight ranges by simply repositioning the same weight plate type between different sections. This uniformity simplifies the user interface and operation while maintaining comprehensive weight range coverage through strategic placement.
Solution Approach 2:
The L-shaped selector is designed to be self-latching when engaged with the weight supporting sections, automatically securing the weight plate in position without requiring additional fastening operations. The selector's geometry allows it to be easily inserted and removed through the slots, providing self-service weight adjustment that is both simple and secure.
3Measurement precision
If complex adjustment mechanisms are used, then weight selection precision is improved, but device complexity increases
Solution Approach 1:
The weight selection system is segmented into discrete, identifiable positions at the first and second weight supporting sections. Each position corresponds to a specific weight value, allowing precise weight selection through simple placement. The L-shaped selector can be positioned at distinct locations along the handle, with each location representing a predetermined weight configuration. This segmentation eliminates the need for complex continuous adjustment mechanisms while maintaining precision.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with a simpler geometric locking system. The L-shaped selector engages with the weight supporting sections through shape complementarity and gravitational force, eliminating the need for springs, cam mechanisms, or other complex mechanical elements. This substitution maintains precision while dramatically reducing device complexity.
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 easy and efficient adjustment of weight resistance with a single type of weight plate, providing a compact and user-friendly solution for accommodating various weight ranges without the need for complex mechanisms.
Implementation Method 1
the movement of mass subject to gravitational force
Data Source
AI summary
An exercise dumbbell includes a handle member and weight plates maintained in spaced relationship at opposite ends thereof. Weight selectors are movable into and out of engagement with different combinations of the weight plates to secure a desired amount of mass to the handle. The weight selectors are routed through the hand grip portion of the handle member, and are accessible via upwardly opening slots in the weight plates. Different latching arrangements may be used to releasably latch the weight selectors in desired locations relative to the weight plates.