Oscillating Tool Blade With Asymmetric Teeth for Nail-Embedded Wood
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Solution Overview
Problem
Oscillating power tools lack accessories with cutting edges that efficiently cut through materials like wood embedded with nails, as existing tools often have short blade life and slow cutting speeds due to the design of their cutting edges.
Innovation Solution
The development of oscillating accessories with asymmetrically arranged teeth on a slanted and curved cutting edge, where the leading tooth is farther from the rear end than the trailing tooth, and intermediate teeth are progressively closer, allowing efficient cutting in one direction and debris clearance in the opposite direction, enhancing durability and cutting speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional symmetric cutting edges are used, then the structure is simple and easy to manufacture, but the blade life is short and cutting speed is slow
Solution Approach 1:
The cutting edge is designed with asymmetric tooth arrangement where the leading tooth is positioned at a greater distance from the rear end than the trailing tooth. This asymmetric configuration optimizes the cutting action by ensuring proper tooth engagement with the workpiece, allowing the blade to cut efficiently through materials like wood embedded with nails, thereby significantly increasing blade life while maintaining manufacturability
Solution Approach 2:
The cutting edge incorporates a curved configuration rather than a straight line, with the teeth arranged along an arc. This curvature allows the blade to follow the natural oscillating motion path more effectively, improving cutting performance and blade life without significantly complicating the manufacturing process
2Device complexity
If conventional symmetric cutting edges are used, then the design is simple, but the cutting speed is slow
Solution Approach 1:
The asymmetric tooth positioning with the leading tooth farther from the rear end creates optimal cutting geometry that enhances cutting speed. This configuration allows for more effective chip evacuation and reduces resistance during the cutting stroke, enabling faster cutting through difficult materials without requiring complex multi-component designs
Solution Approach 2:
Different portions of the cutting edge are optimized for different functions: the leading tooth area is positioned to initiate cutting effectively, while the trailing tooth area is positioned to complete the cut and clear debris. This local optimization of tooth positions along the curved edge improves overall cutting speed while maintaining a relatively simple single-piece blade structure
3Reliability
If asymmetric tooth arrangement is implemented, then blade life and cutting speed increase, but the manufacturing precision requirements increase
Solution Approach 1:
The curved cutting edge provides a natural geometric framework that guides tooth placement. By arranging teeth along a defined arc rather than requiring precise positioning on a straight line, the design tolerates normal manufacturing variations more effectively while still achieving the beneficial asymmetric tooth configuration for extended blade life
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C
AI summary
An accessory (200) for oscillating power tools (12) includes an attachment portion (204) with a rear end (210) couplable to an oscillating power tool (12) and a working portion (202) coupled to the attachment portion (204) and extending along a tool axis (X). The working portion (202) includes a cutting edge (222) arranged asymmetrically relative to the tool axis (X) with a leading tooth (230) disposed at one end of the cutting edge at a first distance (L1) from the rear end (210), a trailing tooth (232) disposed on an opposite end of the cutting edge at a second distance (L2) from the rear end (210) that is less than the first distance (L1), and a plurality of intermediate teeth (231) between leading tooth (230) and the trailing tooth (232), each disposed less than or equal to the first distance (L1) and greater than or equal to the second distance (L2) from the rear end (210), the cutting edge (222) slanted at an acute angle to a line (Y) perpendicular to the tool axis (X).