Straight Cutting Oscillating Blade With Reinforcement Structure
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Solution Overview
Problem
Oscillating blades used for straight cuts in power tools tend to flex, leading to distorted cuts, blade damage, and increased vibration due to their thickness, which is necessary to prevent flexing but increases mass and vibration.
Innovation Solution
A straight cutting oscillating blade with a reinforcement structure that extends across the blade at an angle, reducing thickness and mass while maintaining stiffness, and featuring a cutout region to further minimize vibration, allowing for a thinner cutting zone and improved handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If blade thickness is increased to prevent flexing, then blade stiffness is improved, but tool mass and vibration increase
Solution Approach 1:
The patent transitions from increasing thickness (one dimension) to adding a reinforcement structure extending across the blade (another dimension). The reinforcement structure projects from the blade surface and provides stiffness through its spatial configuration rather than through increased blade thickness, thereby avoiding the mass penalty associated with thicker blades.
Solution Approach 2:
The blade comprises a blade body and a separate reinforcement structure that can be made from the same material or different materials optimized for their specific functions. The reinforcement structure is integrally formed with or attached to the blade body, creating a composite structure that combines the cutting functionality of the blade with the stiffening functionality of the reinforcement structure.
2Strength
If blade thickness is increased to prevent flexing, then blade stiffness is improved, but vibration increases
Solution Approach 1:
The reinforcement structure adds stiffness in a different dimensional approach - by extending across the blade surface rather than thickening the blade. This cross-blade reinforcement provides structural support that reduces vibration during operation without the mass-induced vibration that would result from increasing blade thickness.
Solution Approach 2:
The reinforcement structure can be divided into multiple segments or features distributed across the blade surface. This segmentation allows the reinforcement to counteract vibration at multiple locations along the blade, providing comprehensive vibration reduction rather than concentrating mass in a single thickened region.
3Manufacturing precision
If blade thickness is increased to prevent flexing, then cut accuracy is improved, but blade mass increases
Solution Approach 1:
The reinforcement structure provides the necessary structural support for accurate cutting through its spatial configuration extending across the blade, rather than through increased blade thickness. This allows the blade to maintain low mass while achieving the stiffness required for precise, distortion-free cuts.
4Reliability
If blade thickness is increased to prevent flexing, then blade durability is improved, but tool mass increases
Solution Approach 1:
The composite structure of the blade body and reinforcement structure provides enhanced durability through the reinforcement structure that resists bending and flexing forces. This durability is achieved without increasing the mass of the blade body itself, as the reinforcement structure is an additional feature rather than a thickening of the entire blade.
Data Source
AI summary
An accessory tool for an oscillating power tool includes a blade portion including a first lateral edge portion, a second lateral edge portion, and a leading edge portion, the leading edge portion defining a cutting edge. A reinforcement structure extends linearly across the blade portion from a first position located on the leading edge portion proximate the first lateral edge portion to a second position located on the second lateral edge portion and spaced apart from the leading edge portion. The reinforcement structure defines a cutting zone that encompasses a leading region of the blade portion between the reinforcement structure and the leading edge portion, the reinforcement structure being configured to increase a stiffness of the blade portion.