Screw With Double Notches Reduces Drilling Torque
Solution Overview
Problem
Conventional screws with single cutting notches face increased drilling resistance and debris accumulation, leading to object splitting and potential screw breakage, especially when drilling into high-density materials.
Innovation Solution
A screw design featuring double notches on the shank portion, with cutting notches disposed parallel to the central axis, providing a larger room for debris accommodation and extrusion, and a cambered raw section for enhanced scraping and severing capabilities, reducing drilling torque and preventing screw breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cutting notch is provided on the shank portion, then the screw structure is simple, but the drilling resistance increases and debris accumulation occurs leading to object splitting
Solution Approach 1:
The single cutting notch is segmented into two separate cutting notches on the shank portion. This segmentation allows debris to be more effectively evacuated from the drilling area, reducing drilling resistance and preventing object splitting while maintaining structural simplicity
2Strength
If the cutting notch is constricted to maintain screw strength, then the screw structure is compact, but debris blocking occurs increasing drilling resistance
Solution Approach 1:
The cutting notches are positioned at different angular positions around the shank portion circumference rather than being stacked in one location. This spatial distribution in another dimension allows both notches to function simultaneously for debris evacuation without compromising screw structural integrity
3Force
If more drilling torque is applied to overcome high drilling resistance, then the screw can penetrate high-density materials, but the construction on the cutting notch becomes abraded and the shank portion may break
Solution Approach 1:
The harmful factor of debris accumulation is extracted from the drilling area through the two cutting notches. By actively removing debris during the drilling process, the resistance force is reduced, allowing the screw to penetrate high-density materials with lower applied torque and thus preventing notch abrasion and shank breakage
Data Source
AI summary
A screw with double notches includes a head portion, a shank portion extended outward from the head portion, a threaded section spirally surrounded on the shank portion. Wherein, a raw section on the shank portion is provided with a cambered surface formed integral with the shank portion in cross-section, and a notched section relative to the raw section has two cutting notches separately depressed into the shank portion and disposed near an end of the shank portion, thereby forming a protrudent part between the two cutting notches. By means of the cooperation of the cutting notches and the raw section, the cutting capability and the removal of debris are increased so that a fastened object is prevented from split. Thereby, the drilling speed is promoted, and the effort to rotate the screw is lessened. While the supporting strength of the screw is improved, the screw does not break easily while screwing.