Dual-Thread Wood Screw Structure for Chip Removal and Low Resistance
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Solution Overview
Problem
Conventional screws used in wood materials face challenges in advancing without resistance and in effectively removing chips, leading to pressure on the wood material and potential damage.
Innovation Solution
A screw structure featuring a head part, a rod part, a first thread, and a second thread, where the second thread with a counterclockwise spiral ring at the tap-lock screw-in end provides chip removal and grinding functions, allowing easier penetration into the wood material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thread on the screw-in end cuts out a matching female thread during screw-locking, then the locking function is achieved, but resistance increases and hinders the screw from advancing
Solution Approach 1:
The screw thread is divided into two distinct segments: a first thread with clockwise spiral ring for locking, and a second thread with counterclockwise spiral ring for chip removal. This segmentation allows each thread to perform its specific function independently, reducing overall resistance during screwing while maintaining locking capability.
Solution Approach 2:
The second thread uses a counterclockwise spiral ring, which is the opposite direction of the conventional clockwise thread. This inverted design enables the thread to push chips outward during screwing instead of generating resistance, thereby facilitating easier advancement into the workpiece.
2Strength
If the conventional screw is used to lock wood material, then locking is achieved, but chips are not discharged and accumulate in the wood material
Solution Approach 1:
The screw thread is divided into two distinct segments: a first thread with clockwise spiral ring for locking, and a second thread with counterclockwise spiral ring for chip removal. This segmentation allows each thread to perform its specific function independently, ensuring chips are discharged while locking is maintained.
Solution Approach 2:
The second thread with counterclockwise spiral ring converts the harmful effect of chip accumulation into a beneficial chip removal function. As the screw advances, the second thread actively pushes chips outward, transforming the problem of chip disposal into a useful function that prevents wood material damage.
3Strength
If chips remain accumulated in the wood material, then locking is completed, but pressure on the wood material increases causing cracks and damage
Solution Approach 1:
The second thread with counterclockwise spiral ring converts the harmful effect of chip accumulation into a beneficial chip removal function. As the screw advances, the second thread actively pushes chips outward, transforming the problem of chip disposal into a useful function that prevents wood material damage.
Solution Approach 2:
The second thread performs chip removal action simultaneously during the screwing process rather than after locking is complete. This preliminary action prevents chip accumulation before it can cause pressure and damage to the wood material, ensuring both locking and chip disposal are achieved during the same operation.
Data Source
AI summary
The present invention relates to a screw structure, including a head part, a rod part, a first thread and a second thread. The head part is arranged at one end of the rod part. The other end of the rod part is opposite to the head part to form a tapered tap-lock screw-in end. The first thread is arranged on the surface of the rod part with a clockwise spiral ring and extends to the tap-lock screw-in end. The second thread is arranged on the surface of the tap-lock screw-in end with a counterclockwise spiral ring. The crest height of the second thread is lower than 50% of the crest height of the first thread, and several teeth are formed on the second thread. Accordingly, through the setting of the second thread, the screw has multiple functions such as crushing and chip removal.