Guide Shaft Assembly for Fast Dumbbell Weight Changes
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Solution Overview
Problem
Existing dumbbells with adjustable weights are difficult to disassemble and assemble, making the process tedious and cumbersome.
Innovation Solution
A guide shaft with annular guide grooves and adapting portions that facilitate the assembly and disassembly of counter weights, utilizing a guide shaft body with staggered wave peaks and guide stems to guide the counter weights, and a center rod with mounting bases and cavities for easy attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all counter weights are taken down for disassembly, then complete disassembly is achieved, but the disassembling process becomes tedious and difficult to operate
Solution Approach 1:
The guide shaft is divided into multiple sections with distinct guide grooves (first guide groove for initial engagement, second guide groove for intermediate positioning, third guide groove for final positioning). This segmentation allows the adapting portion to move through staged positions during rotation, enabling selective access to different counter weights without removing all of them, thus simplifying the disassembly operation and reducing time required.
Solution Approach 2:
The adapting portion is designed to dynamically change its radial position relative to the guide shaft body through rotation. By rotating the guide shaft, the adapting portion moves along the guide grooves to different radial distances, dynamically accessing different counter weights. This dynamic mechanism eliminates the need for complete disassembly and reassembly, significantly improving ease of operation and reducing time loss.
2Ease of operation
If multiple guide grooves are added to enable selective counter weight access, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The guide shaft body serves multiple functions simultaneously: it provides structural support for the dumbbell, contains the guide grooves for the adapting portion movement, and enables selective counter weight access through rotation. The adapting portion itself is multi-functional, serving as both a guide element and an engaging element for counter weights. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while improving ease of operation.
Data Source
AI summary
The present disclosure belongs to the technical field of sports equipment and discloses a dumbbell with conveniently assembled and disassembled counter weights and an assembling and disassembling method thereof. The dumbbell includes a center rod, where both ends of the center rod are connected with mounting bases. The dumbbell further includes a pedestal and counter weights, where each of the mounting bases is provided with a plurality of mounting cavities, and the counter weights and the mounting cavities are hooked or disassembled through the rotation of the center rod. The dumbbell further includes a guide shaft that passes through the mounting bases and is connected to the center rod, where at least one annular guide groove and a compound counter weight guide groove are formed in a peripheral surface of the guide shaft, and each guide groove corresponds to one mounting cavity.