Dumbbell Weight-Head Attachment via Segmented Flanges
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Solution Overview
Problem
Existing dumbbell weight-head assemblies are prone to detachment due to inadequate welding or loosening over time, posing safety risks to users and potential damage to objects.
Innovation Solution
The design features flanges offset from the handle ends with through holes containing regular threads, matched by counter-clockwise threads on the weight-heads, allowing secure attachment via screws, and optional welding for added stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If weight-heads are attached by direct welding to the handle bar, then the attachment is initially strong, but the weld junction tends to break under impact and the weight-heads are likely to detach
Solution Approach 1:
The attachment system is divided into multiple components: handle bar, flanges, and weight-heads connected through bolts. This segmentation allows each component to perform its specific function - flanges distribute the load across multiple attachment points, bolts provide adjustable clamping force, and the modular structure enables easier replacement and maintenance of individual parts without compromising the entire assembly.
Solution Approach 2:
The design changes the attachment mechanism from permanent welding to adjustable mechanical fastening with bolts. This parameter change allows the attachment strength to be modified based on usage requirements, enables easy disassembly and reassembly, and provides tolerance for manufacturing variations while maintaining reliable connection under impact loads.
2Device complexity
If weight-heads are screwed on with a single bolt, then the assembly is simple, but the weight-heads become loose or wobbly after period of use
Solution Approach 1:
Instead of using a single bolt, the attachment system is segmented into multiple bolts distributed across flanges on both sides of the handle bar. This segmentation distributes the mechanical loads, prevents single-point failure, and maintains secure attachment even after extended use. The flange structure further segments the attachment area to enhance stability.
Solution Approach 2:
The design transitions from a single-point attachment (one bolt) to a distributed multi-dimensional attachment system. Flanges extend perpendicular to the handle bar axis, and multiple bolts are arranged in a pattern across these flanges, creating a three-dimensional distribution of attachment points that significantly improves resistance to loosening and maintains reliability over time.
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
This design ensures secure and tight weight-heads, reducing the risk of detachment and injury, while maintaining durability and safety.
Implementation Method 1
A plurality of through holes 1.3 are made to the flanges 1.2; corresponding number of holes 1.6 on 2 weight-heads 1.5 are made to contain regular (clockwise) threadlines, so that screws (or bolts) 2.3 (with matching regular threadlines) can be used to attach and tighten the flanges 1.2 to the weight-heads 1.5
Implementation Method 2
FIG. 4 shows that, alternatively, flanges 4.2 may be assembled to handle 4.1 by welding. Weld line 4.1 is shown at the junction area where flanges 4.2 is formed on the handle 4.1, leaving a stub portion for inserting into the weight-heads 4.4 and tightening by bolts or screws 4.6.
Data Source
AI summary
Normal dumbbell assembly tends to have loose of wobbly weight-heads, after repeated use, producing inherent risk of danger for users. Present invention described and claimed a dumbbell assembly that has a structure not likely to have loose or wobbly weight-heads, and thus reducing and avoiding potential harms and dangers to users, due to the tight and secure attachment of weight-heads to the dumbbell handle.