Oscillating Saw Blade With Asymmetric Teeth for Nail-Embedded Wood
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Solution Overview
Problem
Oscillating power tools lack accessories with cutting edges that effectively handle cutting tasks, especially in wood with embedded nails, due to limitations in durability, cutting speed, and blade life.
Innovation Solution
The development of oscillating accessories with asymmetrically arranged teeth on a convex arc-shaped cutting edge, where the leading and trailing teeth are positioned differently relative to the axis, and intermediate teeth are spaced to facilitate efficient cutting and debris clearance, using materials like high-speed steel or carbide for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional symmetric tooth arrangement is used, then manufacturing is simple, but cutting durability and blade life are reduced when cutting wood with nails
Solution Approach 1:
The patent applies asymmetry by arranging teeth at different positions and orientations on the oscillating blade. The leading teeth are positioned at the front edge while trailing teeth are positioned toward the rear, creating an asymmetric pattern that optimizes cutting performance and durability when cutting wood with nails, rather than using a simple symmetric arrangement.
Solution Approach 2:
The patent applies local quality by giving different teeth different functions and characteristics. Leading teeth have specific orientations optimized for initial cutting engagement, while trailing teeth have different orientations optimized for chip clearance and finishing. This localized optimization of tooth properties enhances overall blade life and reliability.
2Productivity
If conventional tooth arrangement is used, then manufacturing is straightforward, but cutting speed is reduced
Solution Approach 1:
The asymmetric tooth arrangement with leading teeth at the front and trailing teeth at the rear creates optimized cutting dynamics that increase cutting speed. The asymmetric pattern allows for more efficient material removal compared to conventional symmetric arrangements.
Solution Approach 2:
The patent applies dynamics by optimizing tooth positions and orientations to work with the oscillating motion of the blade. The asymmetric arrangement takes advantage of the dynamic cutting action, with teeth positioned to maximize engagement during the cutting stroke and minimize resistance during the return stroke.
3Reliability
If conventional blade design is used, then manufacturing is simple, but durability when cutting wood with embedded nails is reduced
Solution Approach 1:
The asymmetric tooth arrangement enhances cutting durability when encountering nails by positioning leading teeth to engage nails at optimal angles and trailing teeth to clear debris effectively. This asymmetric configuration provides superior performance compared to conventional symmetric designs.
Solution Approach 2:
The patent applies local quality by optimizing specific tooth characteristics for different functions - leading teeth are configured for nail engagement and penetration, while trailing teeth are configured for chip and debris clearance. This localized functional optimization enhances overall cutting durability.
4Ease of operation
If conventional tooth spacing is used, then manufacturing is straightforward, but chip and debris clearance is inadequate
Solution Approach 1:
The asymmetric tooth spacing with trailing teeth positioned toward the rear of the blade creates optimized chip clearance paths. The asymmetric pattern ensures effective debris removal during the oscillating motion, preventing clogging and maintaining cutting efficiency.
Solution Approach 2:
The patent applies local quality by optimizing tooth spacing and positioning in different regions of the blade. Trailing teeth are positioned and spaced to maximize chip clearance efficiency, while leading teeth are positioned for optimal cutting engagement. This localized optimization enhances overall ease of operation.
Data Source
AI summary
An accessory for oscillating power tools includes an attachment portion with a rear end couplable to an oscillating power tool and a working portion coupled to the attachment portion and extending along a tool axis. The working portion includes a cutting edge arranged asymmetrically relative to the tool axis with a leading tooth disposed at one end of the cutting edge at a first distance from the rear end, a trailing tooth disposed on an opposite end of the cutting edge at a second distance from the rear end that is less than the first distance, and a plurality of intermediate teeth between leading tooth and the trailing tooth, each disposed less than or equal to the first distance and greater than or equal to the second distance from the rear end, the cutting edge slanted at an acute angle to a line perpendicular to the tool axis.