Offset Tubular Handle for Secure Dumbbell Weight Coupling
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Solution Overview
Problem
Conventional adjustable dumbbells often fail to securely engage weight members, especially when the weight exceeds 50 pounds, leading to potential disengagement and instability during use.
Innovation Solution
An adjustable dumbbell design featuring a handle mechanism with offset tubular members, latches, and spring-biased knobs that securely couple weight members through aligned orifices and apertures, preventing disengagement and allowing for adjustable weight increments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single central handle bar is used to engage weight rings, then the structure is simple, but the weight rings cannot be solidly and stably engaged when weight exceeds 50 pounds
Solution Approach 1:
The single central handle bar is segmented into multiple handle bars (first handle bar and second handle bar) positioned at different locations. Each handle bar independently engages with weight rings through separate engagement mechanisms, distributing the load and improving overall engagement stability for heavier weights.
Solution Approach 2:
The engagement mechanism transitions from a single-point engagement on one handle bar to multi-point engagement across multiple handle bars in different spatial dimensions. This dimensional distribution provides more engagement points and improves stability against disengagement.
2Weight of moving object
If weight rings are made heavier (greater than 60-70 pounds), then the exercise capability is improved, but the weight rings may not be solidly and stably held and carried
Solution Approach 1:
The load is segmented and distributed across multiple handle bars and multiple engagement points. Each handle bar carries a portion of the total weight, reducing the burden on any single engagement point and maintaining stability even when individual weight rings exceed 60-70 pounds.
Solution Approach 2:
Multiple engagement mechanisms are merged into a single integrated handle assembly. The combined engagement capacity of multiple latches and handle bars working together provides sufficient holding force for heavier weights that would overwhelm a single engagement mechanism.
3Ease of manufacture
If a single central handle bar is used, then the device is simple to manufacture, but the weight members cannot be solidly and stably coupled together
Solution Approach 1:
The handle assembly is segmented into multiple separate handle bar components that can be manufactured independently using standard processes, then assembled together. This segmentation maintains manufacturing simplicity for each component while achieving superior overall coupling stability through the multi-component assembly.
Solution Approach 2:
The engagement mechanism uses nested structures where latches are received within bores of tubular members, which are positioned within housings on the handle bars. This nested arrangement provides multiple levels of containment and coupling stability while maintaining a compact, manufacturable structure.
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
The design ensures solid and stable coupling of weight members, preventing separation and allowing for increased weight or size adjustments, enhancing user safety and exercise performance.
Implementation Method 1
a first and a second spring biased knobs attached to the first and the second latches respectively for actuating and moving the latches to engage with the first and/or the second weights
Data Source
AI summary
An adjustable dumbbell device includes two weights engageable to a receptacle, and a handle mechanism includes a handle bar having two end housings, two tubular members are engaged between the housings and offset from each other and each include a bore for slidably receiving and engaging with a latch, the latches are extendible out of the tubular members for engaging with the weights and for retaining the weights to the housings, and two spring biased knobs are attached to the latches for actuating the latches to engage with the weights respectively. The tubular members each include a groove communicating with the bore of the tubular member for slidably engaging with the spring biased knob.