Chisel Brake Point Fastener Prevents Board Splintering
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Solution Overview
Problem
Conventional side angled screws and installation tools often cause damage to boards by splitting or bulging the corner of the board due to their conical tip design, leading to reduced holding strength and improper alignment issues.
Innovation Solution
A fastener with a 'V' shaped end featuring a chisel edge and inclined surfaces that scrape and pre-bore a hole, combined with an installation tool that aligns the screw precisely and ejects material to prevent damage, allowing for efficient and concealed fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conical pointed tip is used to penetrate the board, then the screw can easily penetrate and advance into the board, but the screw shaft is drawn between the grains or fibers causing the lower corner of the board to splinter or bulge
Solution Approach 1:
The screw tip includes a chisel brake point that pre-bores a hole through the board before the threaded shaft engages. This preliminary action removes material in advance, creating a clean hole that prevents the threaded shaft from being drawn between grains or fibers during advancement, thereby preventing splintering and bulging while maintaining advancement speed
2Productivity
If the screw threads rapidly engage the wood, then the screw advances quickly into the board, but this rapid advancement causes wedging action that damages the board corner and reduces holding strength
Solution Approach 1:
The chisel brake point pre-bores a clean hole through the board before the threaded shaft engages the material. This preliminary hole creation allows the threaded shaft to advance without rapid wedging action, preventing board corner damage and maintaining holding strength while still enabling efficient installation
Solution Approach 2:
The chisel brake point is designed as a separate functional element at the tip of the screw that performs material removal. This extracted function of pre-boring separates the hole creation process from the threading process, allowing the threaded shaft to engage a pre-formed hole rather than forcing its way through, thereby preventing damage and maintaining reliability
3Ease of manufacture
If conventional side angled screws are used, then concealed fastening is achieved, but the screw heads remain somewhat visible at angled views and the board corner is damaged
Solution Approach 1:
The chisel brake point pre-bores a clean hole through the board at the desired angled position before the threaded shaft engages. This allows the screw to be installed at an angle that conceals the head from above view while the pre-bored hole prevents the shaft from being drawn between grains or fibers, eliminating splintering and bulging that would compromise both appearance and structural integrity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution prevents damage to the board by pre-boring a hole and augering out material, ensuring secure and concealed fastening with improved holding strength and alignment.
Implementation Method 1
the end including a chisel brake point configured to scrape material from a work piece to pre-bore a hole
Implementation Method 2
the threads of the shaft configured to auger and eject material from the hole
Data Source
AI summary
A fastener including a chisel point that pre-bores a hole in a work piece to prevent damage to the work piece as the fastener advances. The fastener can include a head, a shaft and a chisel brake point formed at an end of the shaft. The chisel brake point can include first and second opposing inclined surfaces disposed at an angle of about 80° to about 150° relative to one another. A thread can begin adjacent the chisel brake point and form an extension of an inclined surface and/or a chisel edge. The chisel brake point can scrape material from a work piece while pre-boring a hole. The material can be transferred to the thread, and subsequently fed up the thread, out of the pre-bored hole. The chisel brake point can also selectively retard advancement of the fastener into the work piece. Methods of installing the fastener also are provided.