Wood Screw Drilling Tip for Slanted Biting in Wood

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Solution Overview

Problem

Slanted screw connections in wood screws face challenges with piloting and biting, especially at obtuse angles, leading to problematic intrusion into wood elements.

Innovation Solution

A wood screw design featuring a drilling tip with two curved longitudinal cutters that continue to a terminal point, providing a thread-free region which facilitates problem-free piloting and biting, even at small angles, and a transition region that can include thread portions and cutters, improving the screw's ability to engage with wood surfaces.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional drilling tip with multiple cutters is used, then the screw can engage with the wood surface, but the piloting behavior deteriorates at slanted angles causing the screw to stray or bump along the surface

Engineering Contradiction:

Improvepiloting behaviorVSAvoidintrusion into wood surface

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The drilling tip is segmented into only two longitudinal cutters instead of multiple cutters, creating a simplified configuration that improves piloting at slanted angles while maintaining effective wood engagement

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The longitudinal cutters are curved rather than straight, following a helical path along the drilling tip length. This curvature enables the cutters to effectively engage and cut wood material even when the screw is piloted at slanted angles, preventing the screw from straying or bumping along the surface

Inventive Principle:

Principle #14Spheroidality (Curvature)

2Reliability

If a thread-free region is provided between the drilling tip and thread, then the transition to threading is improved, but the overall length of the screw shank is reduced

Engineering Contradiction:

Improvethread engagementVSAvoidscrew shank length

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The drilling tip with curved longitudinal cutters creates a preliminary helical groove or depression in the wood material before the thread engages. This preliminary action prepares the wood fibers and creates a pathway that facilitates smooth thread engagement, reducing the need for a long transition region

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS11174887B2Wood screw and method for producing a wood screw

Publication Date: 2021.11.16 SWG SCHRAUBENWERK GAISBACH GMBH & CO KG

AI summary

The invention relates to a wood screw having a screw head having a drive configuration, a screw shank which emanates from the screw head and which at least in portions is provided with a thread, and a drilling tip which adjoins the thread, wherein the drilling tip is configured without a thread, wherein the drilling tip has two longitudinal cutters which continue up to a terminal point of the drilling tip and which run so as to be curved in relation to a central longitudinal axis of the screw, and wherein a circumference of the drilling tip between the two longitudinal cutters does not have any further cutters.