Prism-Shaped Handsaw Teeth for Chip Clogging
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Solution Overview
Problem
Conventional handsaws with triangular teeth suffer from chip clogging due to tapered gullets, leading to deteriorated cutting performance, and have issues with tooth spacing and cutting edge area, resulting in coarse pitch and incomplete cutting.
Innovation Solution
The handsaw features prism-shaped teeth with a constant rising angle, ensuring consistent spacing and preventing chip clogging, while maintaining a wider cutting edge area and improved tooth density for enhanced cutting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If triangular teeth are used in conventional handsaws, then the tooth structure is simple and easy to manufacture, but the gullets become tapered and clog with chips, deteriorating cutting performance
Solution Approach 1:
The patent changes the tooth geometry from traditional triangular shape to a shape with substantially parallel sides, maintaining the gullet width substantially constant from tooth base to tip. This parameter change in tooth configuration prevents gullet tapering and chip clogging, resolving the contradiction between manufacturing simplicity and cutting performance.
2Ease of manufacture
If triangular teeth with tapered gullets are used, then the tooth structure is conventional and easy to produce, but chip clogging occurs in the tapered gullets, making cutting quality deteriorate
Solution Approach 1:
The patent modifies the gullet width parameter to be substantially constant from the base of the tooth to the tip, eliminating the traditional tapered geometry. This parameter change prevents chip accumulation and maintains consistent cutting quality throughout the tooth's service life, resolving the contradiction between ease of manufacture and reliability.
3Object-affected harmful factors
If triangular teeth are arranged with larger spacing, then chip clogging is reduced, but the pitch becomes coarse and cutting performance is incomplete
Solution Approach 1:
The patent changes the gullet geometry parameter from tapered to substantially constant width, which prevents chip clogging without requiring increased spacing between teeth. This allows for finer pitch arrangements while maintaining effective chip evacuation, resolving the contradiction between reducing chip clogging and achieving fine pitch.
4Volume of moving object
If the top edge area is reduced to accommodate triangular tooth geometry, then the tooth structure is compact, but the cutting edge area becomes insufficient for effective cutting
Solution Approach 1:
The patent changes the tooth side geometry to be substantially parallel rather than converging to a point, which maintains a larger top edge area while keeping the tooth structure compact. This parameter change provides sufficient cutting edge area for effective cutting without compromising tooth compactness, resolving the contradiction between tooth compactness and cutting edge area.
Data Source
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AI summary
A handsaw is provided with which chip clogging is eliminated significantly, the pitch of the tooth points can be kept fine rather than coarse, and a large area can be secured for the cut end face, called "top edge", of each of the teeth, whereby degradation in cutting performance caused by the chip clogging can be prevented sufficiently, and the cutting performance is improved significantly. The handsaw has a plurality of saw teeth arranged on a longitudinal edge (21) of the saw blade (20). The saw teeth are formed as prism-shaped teeth (30) each having a shape of a prism, which are configured such that at least adjacent prism-shaped teeth (30) rise at a same rising angle θ from the edge surface (21a) of the longitudinal edge (21) of the saw blade (20), to cause the space (S) between the adjacent prism-shaped teeth to be constant in the rising direction in which the teeth rise.