Segmented Screw Threads for Concrete Fastening
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Solution Overview
Problem
Conventional screws require significant user labor and often result in reaming issues when fastening into concrete objects, as the debris from cutting accumulates within the threaded sections, making it difficult to maintain control and leading to potential screw breakage.
Innovation Solution
A screw design featuring a continuous first threaded section and a non-continuous second threaded section with convex and concave areas, allowing for reduced labor and efficient debris accumulation within the second threaded section, which connects to the first section, minimizing reaming and enhancing fastening into concrete objects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional screw with continuous threaded sections is used, then the screw can cut into the concrete object, but the debris accumulates inside the threaded sections causing reaming issues and difficulty in control
Solution Approach 1:
The second threaded section is divided into multiple non-continuous thread segments separated by gaps. These gaps allow debris to be discharged from the threaded section during screwing, preventing accumulation that causes reaming and loss of control. The segmentation maintains cutting function while enabling debris ejection.
Solution Approach 2:
The harmful factor (debris) is extracted from the threaded section through the gaps in the second threaded section. Instead of allowing debris to accumulate inside the continuous threads, the gaps serve as extraction pathways, removing the debris from the cutting zone and preventing reaming issues.
2Productivity
If a conventional screw with large pitch is used, then the threaded sections can cut the concrete object, but significant user labor is required and the screwing process becomes difficult to control
Solution Approach 1:
The threaded sections are segmented into non-continuous portions with gaps. This segmentation reduces the continuous cutting action required, allowing the screw to advance more easily with less user labor. The gaps reduce resistance while maintaining effective cutting at the thread edges.
Solution Approach 2:
The thread design concentrates cutting action at the edges of the thread segments rather than along the entire thread length. This local concentration of cutting function reduces the overall force required, as only the segment edges actively cut while the gaps provide relief and reduce friction.
3Device complexity
If a single continuous threaded section is used, then the screw structure is simple, but debris cannot be effectively removed leading to reaming and potential screw breakage
Solution Approach 1:
The threaded section is segmented into non-continuous portions with gaps that serve as debris ejection channels. This segmentation adds minimal structural complexity while dramatically improving reliability by preventing debris accumulation that causes reaming and screw breakage.
Solution Approach 2:
The gaps in the threaded section provide extraction pathways for debris removal. This simple structural modification enables effective debris ejection, preventing the harmful accumulation that compromises screw reliability and causes fastening failures.
Data Source
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AI summary
A screw comprising; a head (31); a shank (32) connecting to said head (31); and a first threaded section (33) and a second threaded section (34) spirally disposed on the shank; wherein the shank forms a drilling portion (321) opposite to the head (31), and said two threaded sections both consist of a plurality of threads, and a valley (332) is formed between each two adjacent threads; to be more specific, said first threaded section (33) is disposed near said distal end and said second threaded section (34) is disposed near said head (31), and said two threaded sections connect to each other; moreover, said first threaded section is a continuous threaded section, and said second threaded section is a non-continuous threaded section; still further, each said threads of said second threaded section has a convex area (3411) and a concave area (3412) interlaced, and each two adjacent valleys connect to each other through said concave area.