Speedy-Screwing Screw With Auxiliary Threads
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Solution Overview
Problem
Conventional screws face difficulties in effectively serving wood fibers during screwing operations, leading to increased drilling resistance due to entangled fibers, which slows down the process and can cause wood cracking from accumulated debris.
Innovation Solution
The speedy-screwing screw features a combination of main threads for cutting and auxiliary threads that push and break wood fibers, providing a dual cutting effect to reduce entanglement and debris accumulation, with auxiliary threads extending in a reverse direction and having cutting sections for effective fiber management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional threads are used to cut wood board, then the screwing operation can be completed, but the wood fibers accumulate between the threads and entangle around the shank and drilling portion, increasing drilling resistance and slowing down the screwing operation
Solution Approach 1:
The screw thread structure is segmented into two distinct types: main threads for cutting and auxiliary threads for fiber management. This segmentation allows each thread type to perform its specialized function independently, with main threads executing the primary cutting action and auxiliary threads pushing and breaking wood fibers to prevent entanglement, thereby resolving the contradiction between maintaining cutting effectiveness and preventing fiber accumulation that slows screwing operation
Solution Approach 2:
The auxiliary threads act as an intermediary element between the main threads and the wood fibers. They mediate the interaction by pushing and breaking wood fibers before they can entangle around the shank and drilling portion, thus facilitating smoother screwing operation and preventing the harmful effects of fiber accumulation without interfering with the main cutting function
2Reliability
If conventional threads execute cutting action, then the screw can thread into the wood board, but debris cannot be excluded outwards effectively, causing wood cracking when the screw keeps screwing downwards and pressing the accumulated debris
Solution Approach 1:
The thread structure is divided into main threads and auxiliary threads with distinct functions. The auxiliary threads are specifically designed to exclude debris outwards during screwing operation, preventing accumulation that would otherwise cause wood cracking. This functional segmentation ensures reliable debris management without compromising the cutting action of the main threads
Solution Approach 2:
The auxiliary threads convert the potentially harmful effect of wood fiber compression into a beneficial debris exclusion mechanism. By designing the auxiliary threads to push and break fibers in a controlled manner, the screw transforms the pressing action that would normally cause cracking into an effective debris removal system that prevents cracking
3Ease of operation
If threads rely on cutting action alone, then the screw can be driven into the wood board, but the screwing operation is not smooth and is slowed down due to increased drilling resistance from entangled wood fibers
Solution Approach 1:
The screw thread system is segmented into main threads for cutting and auxiliary threads for fiber management. This division allows the auxiliary threads to specifically address the fiber entanglement problem by pushing and breaking wood fibers, thereby reducing drilling resistance and ensuring smooth screwing operation while the main threads continue their cutting function
Solution Approach 2:
The screw design changes the physical parameters of the thread structure by introducing auxiliary threads with different geometry and orientation compared to main threads. This parameter change enables the auxiliary threads to effectively interact with wood fibers through pushing and breaking actions, reducing friction and drilling resistance to improve the smoothness of the screwing operation
Data Source
Figure 1
Figure 2~2A
Figure 3
AI summary
A speedy-screwing screw (3) includes a shank (31), a head (32) connected thereto, a drilling portion (33) opposite to the head (32), a plurality of main threads (34) and auxiliary threads (35) disposed on the shank (31) and extending in opposite directions . Each auxiliary thread (35) has a plurality of cutting sections (351), each of which has two flank surfaces (3511) converging at a crest (3512) . Adjacent flank surfaces (3511) are continuously connected in reverse curves so that the crests (3512) are connected to be a wavy arrangement. During a screwing operation, the main threads (34) execute a main cutting action, and concurrently the auxiliary threads (35) push and then sever wood fibers effectively, thereby providing a dual cutting effect to prevent the shank (31) and the drilling portion (33) from being entangled in the wood fibers, reduce the screwing resistance caused by the entanglement of wood fibers, and speeding up the screwing operation.