Universal Thread Repair Tool with Adjustable Guide Blade
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Solution Overview
Problem
Existing tools for repairing damaged screw threads are bulky, heavy, expensive, and lack guidance, making them impractical for average workshops and DIY users, and require significant skill and time, often resulting in poor outcomes.
Innovation Solution
A lightweight, slim, and inexpensive tool with a hingedly articulated cutting blade and guide blade that provides guidance for thread repair, adjustable to accommodate different screw diameters, featuring a V-block-like projection and a guide blade with a chamfer to facilitate the repair process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If threading dies are used for thread repair, then thread repair capability is achieved, but device complexity and cost increase due to requiring multiple large and expensive sets for different thread standards
Solution Approach 1:
The chasing tool is designed with a universal body structure that can repair multiple thread standards (including automotive thread standards) using a single tool platform. The tool achieves multi-functionality through adjustable components and interchangeable elements, eliminating the need for multiple specialized die sets while maintaining comprehensive thread repair capability across different standards
Solution Approach 2:
The tool employs segmented and modular components including interchangeable cutters, adjustable positioning mechanisms, and separable blade assemblies. This segmentation allows the single tool to adapt to different thread standards and sizes without requiring complete tool sets for each standard, reducing overall device complexity while preserving versatility
2Adaptability or versatility
If a triangular file is used for thread repair, then thread repair is possible, but time consumption and skill requirement increase while yielding poor results
Solution Approach 1:
The chasing tool incorporates self-guiding features where the guide blade automatically follows the damaged thread profile, and the cutting blade is positioned and oriented by the tool structure itself rather than requiring operator skill for manual file manipulation. This self-service mechanism eliminates the need for considerable operator skill and reduces repair time while improving result quality
Solution Approach 2:
The guide blade acts as an intermediary element that mediates between the operator and the cutting blade. It automatically conforms to the damaged thread geometry and guides the cutting blade along the correct path, removing the skill requirement for manual guidance that plagues triangular file methods while maintaining adaptability to various thread types
3Adaptability or versatility
If threading dies are used for thread repair, then thread repair is achieved, but weight and portability worsen due to large and bulky tool sets
Solution Approach 1:
The chasing tool design allows smaller components such as cutters, guides, and adjustment mechanisms to be nested within or attached to the compact body structure. This nesting approach consolidates multiple functions into a single lightweight tool rather than requiring separate heavy die sets, achieving both portability and comprehensive thread repair capability
Solution Approach 2:
A single lightweight chasing tool body serves multiple thread standards and sizes through adjustable and interchangeable components, replacing the need for multiple heavy specialized tool sets. This universal design dramatically reduces total tool weight while maintaining full thread repair versatility across automotive and other applications
4Adaptability or versatility
If prior art chasing tool is used, then thread repair is achieved, but reliability decreases due to absence of guiding element for heavily damaged threads
Solution Approach 1:
The guide blade serves as a critical intermediary element that automatically conforms to the damaged thread profile and provides positive guidance for the cutting blade. This mediator component ensures reliable and accurate thread repair even in heavily damaged cases by eliminating the need for operator skill in maintaining alignment, significantly improving reliability over prior art tools that lack such guidance mechanisms
Data Source
AI summary
There is provided a tool for repair of damaged threads of screws, including a body (2) having a projecting portion (4) for accommodating a screw to be repaired and having two recessed major surfaces; a cutting blade (6), having a rear end hingedly articulated to the body (2), and a front end in the shape of a cutting face (46) substantially fitting the type of thread to be repaired; a guide blade (7) having a rear end hingedly articulated to the body (2), and a front end substantially fitting the type of thread to be repaired, the guide blade projecting beyond the cutting face of the cutting blade, and; means (10, 12, 14) to alter the distance between the front ends and the projecting body portion (4) to accommodate screws of different diameters.