Hand Tool Positioning Device Prevents Adjusting Member Loss
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Solution Overview
Problem
Conventional positioning devices for hand tools are inconvenient due to the risk of the rotatable plate being lost when rotated excessively, requiring reinstallation.
Innovation Solution
A positioning device with a handle, tool head, positioning member, and adjusting member, featuring a groove with through holes, a chamber, and an adjusting member with an inclined surface and retaining portion, which prevents the adjusting member from continuous rotation and loss by engaging the pusher's conical end with the inclined surface, allowing stable locking and pivotal adjustment of the tool head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the rotatable plate is rotated reversely to unlock the tool head, then the tool head becomes pivotally adjustable, but the rotatable plate is easily lost if rotated overly
Solution Approach 1:
The patent applies preliminary anti-action by designing a retaining portion that proactively prevents the adjusting member from being lost. The retaining portion extends into the chamber and engages with the threaded hole, creating a preliminary constraint that stops the adjusting member before it can be completely rotated out and lost. This preventive measure directly addresses the reliability issue while maintaining the pivotal adjustment capability.
Solution Approach 2:
The retaining portion acts as an intermediary element between the adjusting member and the chamber. It mediates the movement of the adjusting member by providing a physical barrier that prevents excessive rotation. This intermediary structure allows the adjusting member to move freely within the chamber for adjustment purposes while simultaneously preventing it from being completely removed and lost.
2Reliability
If the adjusting member is designed with a retaining portion movable in the chamber, then the adjusting member is prevented from being lost, but the device structure becomes more complex
Solution Approach 1:
The patent merges the retaining function with the adjusting member itself by integrating the retaining portion as an extension of the adjusting member's body. This combination eliminates the need for a separate retaining mechanism, as the retaining portion is formed as part of the adjusting member during manufacturing. This merging approach maintains reliability while minimizing additional structural complexity.
Solution Approach 2:
The adjusting member serves multiple functions: it provides the threaded adjustment mechanism for locking and unlocking, and simultaneously incorporates the retaining portion that prevents loss. This multi-functionality reduces the need for additional separate components, thereby maintaining reliability while avoiding excessive structural complexity.
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 solution provides stable locking and adjustable functionality of the tool head while preventing the adjusting member from being lost, enhancing user convenience and operational safety.
Implementation Method 1
a spring which abuts against the pusher
Implementation Method 2
The threaded shank passes through the threaded hole of the connecting portion to push the pusher for locking the tool head. When the rotatable plate is rotated, the threaded shank moves outwardly away from the pusher
Implementation Method 3
the threaded portion of the adjusting member has an inclined surface defined at one end thereof; the shank of the pusher has a conical end defined on a bottom of the shank and abutted against the inclined surface
Data Source
AI summary
A positioning device for a hand tool includes a handle, a tool head, a positioning member and an adjusting member. The positioning member has a pusher and a spring. The adjusting member has a threaded portion1 extended therefrom and abutted against the pusher. An extending portion is extended from the threaded portion. A retaining portion is defined at one end of the extending portion. Therefore, when a user rotates the adjusting member, the retaining portion is restricted by the pusher for preventing the adjusting member being lost.