Hole Saw Cutting Edge With Progressive Inward Tooth Extension
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Solution Overview
Problem
Existing hole saws face difficulties in slug removal due to tightly wedged slugs caused by moisture, chips, and debris, requiring significant force and time, especially with inwardly extending teeth that engage the slug.
Innovation Solution
A hole saw design with a reduced number of inwardly extending teeth arranged in a progressively increasing set pattern, along with alternating outwardly and straight teeth, facilitates easier slug extraction by minimizing the number of teeth engaging the slug, thus reducing the required force for removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple inwardly extending teeth are used to form and hold the slug, then the cutting edge can effectively cut and retain the slug, but the slug becomes tightly wedged and difficult to remove
Solution Approach 1:
The cutting edge teeth are segmented into different types based on their extension distance: first teeth extend inwardly a first distance, second teeth extend inwardly a second distance greater than the first, and third teeth extend inwardly a third distance greater than the second. This segmentation creates zones of varying engagement strength, allowing the slug to be retained during cutting while providing progressive release points for easier removal.
Solution Approach 2:
Different portions of the cutting edge have different tooth configurations optimized for different functions. The first teeth provide initial engagement, the second teeth provide enhanced retention during cutting, and the third teeth provide maximum retention while still allowing controlled release. This local differentiation resolves the contradiction between strong slug retention and easy slug removal.
2Reliability
If teeth extend inwardly the same distance, then the slug is securely held during cutting, but significant force is required to remove the slug
Solution Approach 1:
The tooth extension distances are made dynamic rather than uniform - the second teeth extend further than the first, and the third teeth extend further than the second. This creates a progressive engagement pattern that adapts to the cutting process, providing secure holding during operation while reducing the force needed for removal through the graduated release mechanism.
Solution Approach 2:
The key parameter changed is the extension distance of the teeth inwardly from the cutting edge. By varying this parameter across different tooth groups (first distance < second distance < third distance), the system achieves both strong slug holding during cutting and reduced force requirements for slug removal, resolving the contradiction between these two requirements.
3Ease of operation
If apertures or slots are added to pry against the slug, then slug extraction is facilitated, but the device complexity increases
Solution Approach 1:
The tooth configuration itself provides the mechanism for slug removal through the progressive extension distances. The third teeth, extending the farthest inwardly, create natural pry points that allow the slug to be extracted with minimal additional structure. The system serves itself by using its own cutting edge teeth as both cutting elements and removal aids, avoiding the need for separate apertures or slots.
Data Source
AI summary
A hole saw blade comprises a substantially cylindrical body with a pair of sides extending substantially concentric to each other. The sides have an inner surface and an outer surface. A cutting edge extends from an end of the body. A plurality of teeth defines the cutting edge. The teeth are arranged in an alternating pattern in which a first tooth extends inwardly of a cylinder containing the inner surface a first inner distance. A second tooth is adjacent to the first tooth extends outwardly of a cylinder containing the outer surface a second outer distance. A third tooth is located adjacent the second tooth on an opposite side of the first tooth and that extends inwardly of the cylinder containing the inner surface a third inner distance greater than the first inner distance.