Power Tool Cutting Arm Profile Structure for Vibration Resistance
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Solution Overview
Problem
Cutting arms in power tools, such as cut-off grinders, are prone to breakage due to high mechanical loadings from unbalanced rotating blades and severe vibrations, leading to potential user injuries and increased material costs from thick, heavy two-part cantilever designs that lack stability and robustness.
Innovation Solution
A profile structure with at least two corrugations on one side and one on the other, arranged symmetrically about a central axis, providing enhanced mechanical stability and stiffness, and formed in a one-piece configuration to eliminate interfaces and reduce weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a two-part cantilever design is used, then the component can be assembled from separate parts, but the interface creates predetermined breaking points and increases material consumption
Solution Approach 1:
The patent merges the two separate cantilever parts into a single integrated component. The profiled beam structure combines the longitudinal beam and transverse reinforcement elements into one piece, eliminating the interface between parts and removing predetermined breaking points at connection locations.
2Ease of manufacture
If a two-part cantilever design is used, then assembly is possible, but the basic structure requires particularly thick walls to transmit forces
Solution Approach 1:
The patent applies local quality by strategically placing reinforcement elements (transverse beams) at specific locations where mechanical stress occurs. Instead of uniformly thickening the entire structure, the reinforcement is localized to critical areas, optimizing material usage while maintaining structural integrity.
3Ease of manufacture
If a two-part cantilever design is used, then separate components can be produced, but the power tool weight increases
Solution Approach 1:
The patent combines multiple structural elements into a single integrated profiled beam, eliminating the weight of connection interfaces, fasteners, and the additional material required for thick walls in two-part designs. The unified structure reduces overall material consumption and consequently reduces weight.
4Ease of manufacture
If recesses are arranged only on one side (pot geometry), then production is simplified, but mechanical stability and robustness are reduced
Solution Approach 1:
The patent employs asymmetry in the profiled beam structure by positioning reinforcement elements strategically rather than symmetrically. The transverse reinforcement beams are placed at specific locations along the longitudinal beam to optimize resistance against bending and torsion, creating an asymmetric configuration that enhances mechanical stability while maintaining manufacturability.
Data Source
AI summary
A profile structure for a component of a power tool, wherein the profile structure has a front side and a rear side, and wherein the profile structure has at least two corrugations on one of the two sides and at least one corrugation on the other side. A power tool having a component that includes a profile structure. The power tool may preferably be a cutting or severing device, wherein the power tool component may be a cutting arm. The profile structure is particularly suitable for withstanding different loadings to which a component of a power tool may be exposed. The loadings may be for example bending about a horizontal or about a vertical axis or torsion. In a further aspect, the invention relates to a cutting arm for a power tool, wherein the cutting arm comprises a profile structure. The cutting arm may in particular be formed in one piece.