Adjustable Dumbbell With Retractable Extension Carriers
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Solution Overview
Problem
Conventional adjustable dumbbells require permanent extension carriers or tracks on the handle bar, which increase length and cannot be adjusted simultaneously, limiting the ease and speed of weight adjustment.
Innovation Solution
An adjustable dumbbell assembly with a receptacle containing compartments for weight members, a handle bar with catches and followers, and an actuating member with a wheel and motor driving member, allowing for quick and easy adjustment of weight by sliding and engaging the weight members with the handle bar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If extension carriers or tracks are permanently formed on the end portions of the central handle bar, then the weight rings can be selectively secured to adjust the weight, but the handle bar length is greatly increased
Solution Approach 1:
The extension carriers are received within the end portions of the central handle bar rather than being permanently attached to it. This nesting arrangement allows the extension carriers to be stored compactly within the handle bar when not in use, eliminating the need for a greatly increased handle bar length while still providing weight adjustment capability when the carriers are deployed.
Solution Approach 2:
The extension carriers are made movable relative to the central handle bar, transitioning between a retracted position (stored within the handle bar) and an extended position (protruding from the handle bar). This dynamic configuration allows the system to adapt its length based on operational needs, providing weight adjustment capability only when required while maintaining a compact form when not in use.
2Adaptability or versatility
If extension carriers are moved and adjusted relative to the central handle bar for weight adjustment, then the weight can be changed, but the adjustment cannot be performed simultaneously on both extension carriers
Solution Approach 1:
The adjustment mechanisms for the first and second extension carriers are combined into a single integrated adjustment mechanism. This allows both extension carriers to be moved and adjusted simultaneously by a single user action, eliminating the time loss associated with adjusting each carrier separately and enabling faster weight changes.
Solution Approach 2:
The single adjustment mechanism serves multiple functions by simultaneously controlling both extension carriers. This multi-functional design allows one adjustment action to accomplish what would otherwise require two separate actions, significantly reducing the time and effort needed for weight adjustment while maintaining full adaptability.
3Adaptability or versatility
If two extension carriers are provided on the central handle bar for weight adjustment, then weight can be adjusted, but the structure becomes more complex
Solution Approach 1:
The adjustment mechanisms for both extension carriers are merged into a single integrated mechanism, reducing the overall number of independent components. This consolidation simplifies the structure by eliminating redundant adjustment mechanisms while still providing the capability to adjust both extension carriers, thereby reducing device complexity while maintaining adaptability.
Data Source
AI summary
An adjustable dumbbell assembly includes a dumbbell mechanism having two or more weight members engaged in a receptacle, and a handle bar engaged between the weight members, two catches slidably engaged in the handle bar and extendible out and engageable with the weight members for detachably attaching the weight members to the handle bar, two followers slidably engaged in the receptacle and each having a protrusion for engaging with the catches and for moving the catches to engage with the weight members, and for detachably attaching the weight members to the handle bar, and an actuating member engaged with the followers for actuating the followers to move the catches to engage with the weight members.