Dumbbell Assembly Multi-Pin Connection
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Solution Overview
Problem
Existing dumbbell assemblies with adjustable weights face issues of weight block detachment due to defective hooking protrusions, leading to potential hazards during exercise and increased maintenance costs.
Innovation Solution
A dumbbell assembly design featuring a base seat with receiving grooves for weight blocks and weight adjustment modules with insertion pins that engage with the blocks, allowing for adjustable weight selection by rotating the handle, ensuring secure connection and easy weight adjustment without relying on a single hooking protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single hooking protrusion is used to connect the weight block to the handle, then the structure is simple, but the reliability is poor and the weight block is easily detached
Solution Approach 1:
The connection structure is divided into multiple independent insertion pins (at least two) instead of using a single hooking protrusion. Each insertion pin independently engages with corresponding engaging holes in the weight block, distributing the connection load and providing redundancy. If one pin fails, the weight block remains secured by other pins, significantly improving reliability while maintaining structural simplicity.
Solution Approach 2:
The patent incorporates resilient elements (springs) within the insertion pins to provide beforehand cushioning. These resilient elements absorb impact forces and reduce stress concentrations during weight block attachment and detachment operations. By preparing the connection structure with built-in shock absorption capability, the design prevents premature failure of the insertion pins and enhances overall connection reliability before failures can occur.
2Reliability
If multiple insertion pins are used to connect weight blocks, then the connection reliability is improved, but the device complexity increases
Solution Approach 1:
The insertion pins are designed with multi-functionality to reduce overall device complexity. Each insertion pin serves multiple purposes: it provides structural connection, incorporates resilient elements for shock absorption, and works in conjunction with the rotating handle mechanism for weight adjustment. The handle itself serves dual functions as both the gripping element and the rotational actuator for engagement/disengagement. By making components multi-functional, the patent achieves reliable multi-pin connection without proportionally increasing complexity.
Solution Approach 2:
The patent merges the weight adjustment mechanism with the connection mechanism. The rotating handle simultaneously performs the function of adjusting weight selection and actuating the engagement/disengagement of multiple insertion pins. The insertion pins are integrated into the handle structure rather than being separate components, and the resilient elements are embedded within the pin structures themselves. This merging of functions and components achieves reliable multi-point connection while minimizing the number of separate parts.
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 allows for safe and adjustable weight selection, reducing the risk of weight block detachment and minimizing maintenance costs by enabling connection through multiple insertion pins, ensuring stable and secure weight adjustment.
Implementation Method 1
at least one insertion pin resiliently connected to the drive component
Data Source
AI summary
A dumbbell assembly includes a base seat having two receiving areas, two weight units respectively received in the receiving areas, and a dumbbell. Each weight unit includes a plurality of weight blocks each having at least one engaging hole. The dumbbell includes a handle, and two weight adjustment modules each including an insertion base, and a plurality of engaging units each including a drive component mounted on the handle, and at least one insertion pin connected to the drive component. The handle is rotatable relative to the weight adjustment modules to drive each engaging unit to move between an engaging state and a disengaging state.