Adjustable Dumbbell Weight Selector Mechanism
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Solution Overview
Problem
Existing adjustable weight exercise devices lack a straightforward method to select and combine different weight resistances efficiently, limiting user flexibility in exercise routines.
Innovation Solution
The exercise dumbbell design features a handle member with weight supporting sections and a weight selector mechanism, where a knob rotates to engage and disengage weights in increments, allowing for balanced and unbalanced adjustments between 5 and 40 pounds in 2.5-pound increments, using cammed segments and spring-loaded mechanisms for precise weight selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional adjustable weight exercise devices are used, then weight resistance can be adjusted, but the method to select and combine different weights is complex and inefficient
Solution Approach 1:
The weight plates are divided into multiple segments with different weight values (5 lb, 10 lb, 15 lb, 20 lb, 25 lb segments). Each segment can be independently selected and attached to the handle, allowing users to build custom weight combinations by adding or removing specific segments rather than dealing with a single complex adjustment mechanism.
Solution Approach 2:
A selector pin acts as an intermediary component between the user and the weight plates. The pin engages with notches on the weight segments to secure them to the handle. This simple intermediary mechanism replaces complex locking systems while providing reliable weight selection through intuitive pin insertion and removal.
2Adaptability or versatility
If multiple weight combinations are available, then user flexibility for varied exercise intensity is improved, but the mechanism to achieve these combinations becomes more complex
Solution Approach 1:
Weight plates are segmented into standardized increments (5, 10, 15, 20, 25 pounds) that can be independently combined. This segmentation allows users to create any weight combination from 5 to 40 pounds by selecting appropriate segments, providing extensive versatility without requiring a complex mechanism for each specific weight setting.
Solution Approach 2:
The weight configuration is made dynamic and adjustable during use. Users can easily add or remove weight segments by simply inserting or removing the selector pin, allowing real-time adaptation of weight combinations to match different exercise requirements and intensity levels without permanent configurations.
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 users to easily adjust weight resistance in a wide range, providing balanced and unbalanced increments for varied exercise intensity, enhancing user flexibility and effectiveness in workout routines.
Implementation Method 1
a weight selector compressed between the knob and a spring
Implementation Method 2
methods and apparatus involving 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. Knobs on the handle member have contoured bearing surfaces that bear against respective selector members to alternatively hold the selector members in weight engaging positions and disengaged positions.