Adjustable Hand Tool Pivot with Movable Engagement for Stress Relief
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Solution Overview
Problem
The pivot of existing hand tools is prone to failure due to stress concentration during prying operations, particularly at the connecting region between the hexagonal column portion and the cylindrical portion.
Innovation Solution
An adjustable hand tool design featuring a pivoting device with an engaging member and an axial member that allows the tool head to adjust its angle relative to the rod, incorporating a limiting and containing hole system to distribute stress and prevent damage by enabling the engaging member to disengage from the engaging hole, thereby reducing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the pivot is designed with a connecting region between hexagonal column portion and cylindrical portion, then the pivot can be integrated into the tool structure, but the pivot becomes prone to failure due to stress concentration during prying operations
Solution Approach 1:
The pivot is divided into separate components: a hexagonal column portion and a cylindrical portion, connected through a connecting region. This segmentation allows each portion to be optimized for its specific function while the connecting region can be designed to distribute stress more effectively, preventing failure during prying operations.
Solution Approach 2:
The connecting region of the pivot is designed with specific geometric characteristics to distribute stress concentration. By optimizing the local geometry at the connecting region between the hexagonal column portion and cylindrical portion, the stress distribution is improved, enhancing the pivot's reliability during high-stress prying operations.
2Device complexity
If the tool head is fixed relative to the rod, then the structure is simple, but the tool cannot adapt to different operational angles and stress distributions
Solution Approach 1:
The tool head is made adjustable relative to the rod through a pivoting mechanism. The tool head can pivot between a first position for prying operations and a second position for other operations, allowing the tool to adapt to different operational angles. This dynamic adjustment capability enhances versatility while maintaining relatively simple structure.
Solution Approach 2:
The tool is designed with multi-functionality through adjustable angle capability. The same tool can perform prying operations at one angle and other operations at different angles, making it universally applicable to various tasks. The pivoting mechanism enables the tool head to assume multiple positions, providing adaptability without requiring multiple separate tools.
3Strength
If the engaging member is permanently fixed in the engaging hole, then the connection is strong, but stress concentration occurs at the connecting region during prying operations
Solution Approach 1:
The engaging member is designed to be movable within the engaging hole rather than permanently fixed. The engaging member can move between engaged and disengaged positions, allowing it to dynamically respond to stress during prying operations. This mobility prevents stress concentration at the connecting region while maintaining sufficient connection strength during normal operation.
Solution Approach 2:
The engaging member's ability to move within the engaging hole provides a form of stress cushioning. During prying operations, the engaging member can shift position to accommodate stress, preventing stress concentration at the connecting region. This beforehand cushioning capability protects the pivot from failure by distributing stress more evenly throughout the structure.
Data Source
AI summary
An adjustable hand tool includes a rod, a tool head, and a pivoting device. The tool head is pivotally connected to the rod. The pivoting device includes an engaging member and an axial member. The engaging member is movably inserted through the tool head and the rod. The engaging member is provided with an engaging portion detachably engaged with an engaging hole of the tool head, and a limiting portion corresponding to a limiting hole of the rod. The axial member is movably inserted through the tool head, and the axial member is fixedly connected to the engaging member to drive the engaging member, allowing the engaging portion to disengage from the engaging hole.