Twin Pin Selectorized Dumbbell Balanced Weight Coupling
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Solution Overview
Problem
Traditional selectorized dumbbells often result in unbalanced weight distribution due to a single connecting pin, leading to a sense of insecurity and potential detachment during use, as the weights can become dislodged.
Innovation Solution
The use of two separate connecting pins, one for each array of holes and slots on either side of the transverse centerline, ensures balanced coupling of weights to the handle, providing a redundant safety mechanism to prevent accidental dislodgment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single connecting pin is used to couple weights to the handle, then the device complexity is reduced, but the reliability of weight attachment deteriorates as weights can become dislodged
Solution Approach 1:
The single connecting pin is divided into two separate connecting pins, each responsible for coupling weights on opposite sides of the handle. This segmentation improves reliability by distributing the attachment function across multiple independent connection points, preventing single-point failure while maintaining manageable device complexity.
Solution Approach 2:
The dual pin design provides a redundant safety mechanism that cushions against potential failure. If one pin were to fail or become dislodged, the second pin continues to provide attachment security, preventing complete weight detachment. This prior cushioning approach enhances reliability without significantly increasing overall system complexity.
2Ease of manufacture
If a single connecting pin is used, then the manufacturing cost is reduced, but the stability of weight distribution deteriorates causing unbalanced weight feel
Solution Approach 1:
The two connecting pins are positioned asymmetrically on opposite sides of the handle's centerline, creating a balanced asymmetric configuration. This arrangement improves weight distribution stability by ensuring equal leverage and support on both sides, while the manufacturing process remains relatively simple through standardized pin components and straightforward positioning.
Data Source
AI summary
A selectorized dumbbell has a handle that can be inserted into a gap between stacks of nested left and right weight plates that are provided in a plurality of nested weights. A selector determines how many left weight plates are coupled to the left end of the handle and how many right weight plates are coupled to the right end of the handle. A single left weight plate and a single right weight plate are interconnected together by an interconnection member of some type to form a single weight. The interconnection members of the different weights overlie one another and are provided with two arrays of a plurality of unique sets of holes and slots. A first connecting pin is inserted through the handle and through a selected set of holes and slots in the first array. A second connecting pin is inserted through the handle and through a selected set of holes and slots in the second array. The two pins together symmetrically couple the desired number of weights to the handle in a balanced fashion.