Wood Screw Thread Structure for Vibration-Resistant Locking
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Solution Overview
Problem
Conventional screw structures for wood materials are prone to loosening due to vibration after locking, despite features for shaving collection and rapid insertion, as they lack effective mechanisms for secure fastening.
Innovation Solution
The screw structure incorporates a head with a rod body featuring a first screw thread with positioning teeth, second screw threads, a reamer thread, and embossed teeth for collecting shavings and providing a stable locking mechanism, ensuring the screw remains securely fastened.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional screw structures with shaving collection slots are used, then rapid insertion and shaving removal are achieved, but the screw is easily loosened due to vibration after locking
Solution Approach 1:
The screw thread is divided into multiple functional sections: a first screw thread portion for rapid insertion, a second screw thread portion with enhanced locking capability, and a transition portion connecting them. This segmentation allows different parts of the screw to perform different functions - the first portion enables fast insertion while the second portion provides superior vibration resistance through its modified thread geometry and increased engagement with the workpiece
Solution Approach 2:
The screw structure implements local quality by varying the thread characteristics along its length. The first screw thread portion has one set of geometric properties optimized for rapid insertion, while the second screw thread portion has different geometric properties (such as modified pitch, depth, or angle) specifically optimized for locking and vibration resistance. This localized differentiation resolves the contradiction between insertion speed and anti-loose performance
2Ease of manufacture
If screws with simple thread structures are used, then manufacturing is simple, but effective tightening and vibration resistance are insufficient
Solution Approach 1:
The threaded rod is segmented into distinct thread portions with different characteristics. The first screw thread portion maintains a conventional design for ease of manufacturing, while the second screw thread portion introduces modified geometry for enhanced locking. This segmentation allows the complex functional requirements to be met without overly complicating the entire manufacturing process, as only a portion of the thread requires specialized formation
3Reliability
If multiple thread portions with different functions are added, then anti-loose effect is improved, but device complexity increases
Solution Approach 1:
The invention merges multiple functional requirements into a single integrated screw structure. The first and second screw thread portions are combined on the same threaded rod, with the transition portion smoothly connecting them. This merging allows the screw to provide both rapid insertion and superior vibration resistance without requiring multiple separate components, thereby improving reliability while controlling overall device complexity
Data Source
AI summary
A screw structure is disclosed herein. It comprises a head; a rod body integrally extended from the head and having a flat shank part and a tapered tip at a terminal of the flat shank part; a first screw thread disposed on the rod body and having a positioning tooth at a terminal thereof, a plurality of cutting units and a plurality of shaving collection spaces; a plurality of second screw threads disposed on the rod body; and a reamer thread disposed at an upper end of the rod body.