Segmented Screw Thread Angles for Gypsum Plate Fastening
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Solution Overview
Problem
Existing screw designs often break or cause significant cracking in gypsum or thin steel plates when used with an air screw driver, compromising the combination force due to the impact from the screw.
Innovation Solution
A screw design featuring a first thread section near the head and a second thread section near the tip, with thread angles greater than 90 degrees, allowing for alternative thread arrangements to minimize damage and ensure secure attachment without breaking the plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional screw designs are used to combine with gypsum or thin steel plates, then the screw can be driven in quickly, but the plate breaks or significant cracks are generated
Solution Approach 1:
The screw thread is divided into two distinct sections: a first thread section with a smaller thread angle for initial penetration and a second thread section with a larger thread angle for final securing. This segmentation allows the screw to perform different functions at different stages of insertion, reducing plate damage while maintaining driving efficiency
Solution Approach 2:
Different portions of the screw thread are given different geometric properties. The first thread section has a smaller thread angle suitable for initial penetration, while the second thread section has a larger thread angle (greater than 90 degrees) for secure attachment. This local differentiation of thread geometry optimizes performance for each specific function
2Device complexity
If conventional screw thread designs are used, then the screw structure is simple, but the combination force is compromised due to plate cracking
Solution Approach 1:
The thread structure is segmented into two sections with different angles, which maintains relative simplicity while significantly improving reliability. The first thread section enables clean penetration without excessive cracking, and the second thread section provides superior holding power, together ensuring reliable combination without overly complicating the screw design
Solution Approach 2:
The thread angle parameter is changed along the length of the screw. The first thread section has a smaller thread angle for penetration, while the second thread section has a larger thread angle (greater than 90 degrees) for securing. This parameter variation optimizes both the simplicity and reliability of the screw design
Data Source
Figure 1~2
AI summary
A screw having a first thread section (2) near a screw head and a second thread section (3) near a screw tip; an angle between a first surface (311) of a thread of the second thread section (3) and a second surface (312) of the thread of the second thread section (3) adjacent to the first surface (311) of the thread of the second thread section (3) is greater than 90 degrees; and the second thread section extends to the screw tip. The second thread section includes only one thread or has two threads which are alternatively arranged. When the screw is applied to a gypsum plate or thin steel plate, an air nail driver serves to drive the screw into a gypsum plate. The gypsum will not break due to the impact from the screw. Furthermore, the crack in the steel plate is small so as not to affect the combination force thereof.