Hand Tool Positioning Device With Threaded Locking Mechanism
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Solution Overview
Problem
Conventional hand tools with pivot tips are prone to breakage under strong force due to their connecting structure and offer limited adjustability, being restricted to only two work positions parallel and perpendicular to the hand grasp member.
Innovation Solution
A positioning device with a handle and tool head connection featuring a chamber, threaded hole, and a rotatable plate with a threaded shank, allowing the tool head to be pivotally adjusted to a desired angle through engagement and disengagement of teeth and a spring mechanism for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a connecting structure is used between the pivot tip and the elongated shank, then the tool can achieve relative retracting or extending movement, but the work piece shaft becomes prone to breakage under strong force
Solution Approach 1:
The patent applies the dynamics principle by implementing a movable positioning member that can shift between locked and unlocked states. The positioning member moves along the longitudinal axis within a chamber, allowing dynamic adjustment between securing the work piece shaft firmly and permitting relative movement for angle adjustment, thereby resolving the contradiction between strength and adaptability
Solution Approach 2:
The positioning member acts as an intermediary between the handle and the tool head. It mediates the connection by providing a controlled interface that allows angle adjustment while maintaining structural integrity. The positioning member's teeth engage with the tool head's teeth to transmit force while allowing controlled movement, preventing direct stress on the work piece shaft
2Device complexity
If the pivot tip is restricted to two working positions, then the structure is simple, but the tool is inconvenient to use for various angles
Solution Approach 1:
The positioning member is designed to be movable along the longitudinal axis within the chamber, allowing it to dynamically adjust between locked and unlocked states. This dynamic capability enables continuous angle adjustment of the tool head relative to the handle, transforming a static two-position system into a dynamic multi-angle system while maintaining structural simplicity
Solution Approach 2:
The connection structure is segmented into distinct components: the handle with chamber, the movable positioning member with teeth, and the tool head with engagement features. This segmentation allows the positioning member to independently move and engage at different positions, enabling versatile angle adjustment without complicating the overall structure
3Reliability
If a threaded shank and rotatable plate are added for locking, then the tool head can be securely locked at desired angles, but the device complexity increases
Solution Approach 1:
The rotatable plate with threaded shank acts as an intermediary locking mechanism. The threaded shank engages with the positioning member to provide secure locking at desired angles. This intermediary component adds reliability by ensuring the tool head remains firmly locked, while the modular design keeps the overall structure manageable
Solution Approach 2:
The locking mechanism is merged with the existing positioning structure. The threaded shank integrates with the positioning member's chamber, and the rotatable plate combines the adjustment and locking functions in a single integrated component, reducing overall complexity despite adding locking capability
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
Enhances the durability and adjustability of hand tools by allowing precise angle adjustments and secure locking of the tool head, preventing breakage and enabling more versatile usage.
Implementation Method 1
a spring abutting against the pusher. The pusher has a receiving space defined in the bottom thereof for receiving the spring
Implementation Method 2
a rotatable plate has a threaded shank extended therefrom. The threaded shank passes through the threaded hole for locking the pusher. When the rotatable plate is rotated, the threaded shank moves outwardly away from the pusher
Data Source
AI summary
A positioning device for a hand tool includes a handle having a first connecting portion formed a chamber defined therein, a positioning member movably received in the chamber, and a tool head pivotally connected to the first connecting portion. The first connecting portion has a threaded hole. A rotatable plate has a threaded shank extended therefrom. The threaded shank passes through the threaded hole and abuts against the positioning member. The positioning member rigidly engages with the tool head. When the threaded shank is moved away from the positioning member, the tool head is available to be pivotally adjusted at a desired angle.