Hole Saw Tooth Pattern With Variable Pitch Against Breakage
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Solution Overview
Problem
Conventional hole saws face issues with tooth breakage due to reduced blade body width, leading to increased stress and vulnerability, especially when teeth are offset or have varying tip heights, which can result in multiple teeth breaking off during cutting operations.
Innovation Solution
A hole saw design featuring a repeating pattern of teeth with uniform tip heights, varying pitch distances, and strategically positioned gullets to distribute stress evenly and prevent binding, combined with a wider blade body for increased strength and reduced likelihood of tooth breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of the blade body is decreased to increase cutting speed, then cutting speed is improved, but the strength and durability of the teeth deteriorate
Solution Approach 1:
The patent applies local quality by providing teeth with varying tip heights rather than uniform heights. Specifically, at least one tooth has a tip height greater than the average tip height of other teeth. This local variation distributes cutting forces more effectively across different tooth positions, allowing the blade body to maintain sufficient strength even with reduced width, while still achieving high cutting speeds through optimized tooth geometry and material removal patterns.
2Productivity
If teeth are offset from the blade body to improve cutting performance, then cutting efficiency is improved, but the reliability and resistance to tooth breakage deteriorate
Solution Approach 1:
The patent applies parameter changes by varying the tip heights of teeth rather than maintaining uniform offset distances. By having at least one tooth with a tip height greater than the average, the cutting parameters are optimized to reduce lateral forces that cause tooth breakage. This parameter variation allows teeth to be offset for improved cutting efficiency while the varying heights compensate for increased stress, maintaining reliability.
3Productivity
If teeth have varying tip heights to improve cutting performance, then cutting efficiency is improved, but the stress on individual teeth increases leading to higher breakage risk
Solution Approach 1:
The patent applies local quality through strategic placement of at least one tooth with greater tip height than the average. This localized variation in tooth geometry creates specific stress distribution patterns where the taller tooth takes on a portion of the cutting load, but the overall stress on individual teeth is reduced through the alternating pattern of tooth heights. This local quality approach improves cutting efficiency while managing stress levels to prevent breakage.
Data Source
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AI summary
A saw blade (100) can include a blade body (114) having a cutting edge (101) defined by multiple teeth (102-112). The teeth can be disposed in a repeating pattern including a raker tooth (106), a first set tooth (102) having a light offset to a right side of the blade body, a second set tooth (104) having a heavy offset to the left side of the blade body, a second raker tooth (112), a third set tooth (108) having a light offset to the left side, and a fourth set tooth (110) having a heavy offset to the right side of the blade body. Each tooth can include a tip, rake face, gullet having a gullet depth, and one or more clearance surfaces. The pitch distance and gullet depth of the heavy offset teeth can be less than the pitch distances and gullet depths of the remaining teeth to provide an increased amount of strength for the heavy offset teeth.