Full-Thread Self-Drilling Screw for Stronger Security Screen Clamping
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Solution Overview
Problem
Existing screws, such as thread-forming and self-drilling screws, are inadequate for securely fastening security screens to metal frames without pre-drilled holes, and prior self-drilling screws lack sufficient thread length for strong clamping in security screen applications.
Innovation Solution
A self-drilling screw design featuring a head, a shank with a drill bit at one end, and a thread extending along the full length of the shank, including the drill bit, providing enhanced holding strength and allowing direct insertion without pre-drilling, with options for pan or countersunk heads and various engagement portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a thread-forming screw is used to fasten security screens to metal frames, then the screw can be driven into pre-drilled holes, but the process requires two separate actions (drilling then screwing) and does not provide sufficient holding strength
Solution Approach 1:
The patent combines the drilling function and thread-forming function into a single integrated screw design. The screw features a drill bit at the tip for drilling holes and threads along the shank for fastening, eliminating the need for separate drilling and screwing operations while providing sufficient holding strength through the integrated design.
2Ease of operation
If a prior art self-drilling screw is used, then drilling and fastening can be combined in one action, but the thread length is insufficient for strong clamping in security screen applications
Solution Approach 1:
The patent modifies the geometric parameters of the self-drilling screw, specifically extending the thread length along the shank to provide sufficient clamping strength for security screen applications. The screw maintains its self-drilling capability while the extended thread engagement ensures strong fastening in metal frames.
3Reliability
If existing screws are used for security screen assembly, then fastening can be achieved, but the process is time-consuming and causes repetitive strain injuries
Solution Approach 1:
The patent combines multiple fastening operations into a single self-drilling screw action, eliminating the need for separate drilling and fastening steps. This integrated approach maintains secure fastening reliability while significantly reducing assembly time and minimizing repetitive strain on workers.
Data Source
AI summary
A self-drilling screw, particularly for use in a security screen employing leveraged clamping. The self-drilling screw comprises a head and a shank. A drill bit is formed at one end of the shank away from the head with a thread extending along the full length of the shank, including the drill bit. The thread on the drill bit increases holding strength.