Chisel Blade with Angled Side Cutting Edge
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Solution Overview
Problem
Conventional chisels often have limited directional and angular capabilities for cutting and striking, which restrict their versatility and effectiveness in various materials like wood, sheet metal, and spot welds.
Innovation Solution
A chisel design featuring a blade with a beveled side cutting edge and a striking surface, where the beveled side cutting edge is angled between 35 to 45 degrees relative to the main body, and the front beveled cutting edge is angled between 10 to 20 degrees, allowing for enhanced cutting and striking capabilities with variable hardness levels for improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional chisel design with a single cutting edge is used, then the structure is simple and easy to manufacture, but the directional and angular capabilities for cutting are limited
Solution Approach 1:
The blade is segmented into multiple distinct cutting edges: a front cutting edge for conventional striking operations and a side cutting edge for angled and lateral cutting operations. Each cutting edge is independently configured with specific bevel angles, allowing the tool to handle multiple cutting directions and angles without requiring multiple separate tools, thus improving versatility while maintaining a unified blade structure.
Solution Approach 2:
The invention extends the cutting functionality from a single-dimensional front edge to a two-dimensional surface by adding a side cutting edge that operates in a lateral dimension. The side cutting edge is positioned at an angle relative to the front cutting edge, enabling cutting operations in multiple directions (frontal, lateral, and angled combinations), thereby transforming the tool's capability from linear to planar cutting vectors.
2Reliability
If the entire blade is made with high hardness, then the cutting edges are more durable, but the strike surface becomes too brittle to withstand impact
Solution Approach 1:
The blade exhibits non-uniform hardness distribution across its structure. The cutting edges (front and side) are hardened to high hardness levels (55-58 HRC) to ensure durability and sharpness retention during cutting operations. In contrast, the strike surface and main body portion are maintained at lower hardness levels (38-44 HRC) to provide toughness and impact resistance. This local differentiation of material properties allows each region to optimize its function without compromising the overall blade performance.
Solution Approach 2:
The blade can be constructed using composite material structures or differential heat treatment processes that create distinct material zones within a single component. The cutting edge portions may utilize high-carbon steel or receive additional hardening treatments, while the strike surface utilizes tougher, more ductile material compositions or undergoes tempering processes that enhance impact resistance. This composite approach enables simultaneous optimization of cutting edge durability and impact resistance.
Data Source
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AI summary
A chisel includes a blade joined with a handle configured to be struck by a striking instrument. The blade includes a front beveled cutting edge portion at its forward end, a beveled side cutting edge portion along one longitudinal side of the blade, and a strike surface along an opposite, longitudinal side. The blade also has a main body portion that narrows in thickness as it extends in a forward direction from a relatively rearward portion thereof to the front beveled cutting edge portion and that narrows in thickness as it extends in a lateral direction from the strike surface towards the beveled side cutting edge portion. The beveled side cutting edge portion has a surface forms an angle with a surface of the main body portion.