Elliptical Saw Blade With Variable Tooth Height
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Solution Overview
Problem
Existing saw blades with reciprocating arcuate swing motion for electric cutting tools face issues such as heat generation and deformation when cutting thick wood, and they require specific techniques and are hazardous due to loose particle scattering and noise.
Innovation Solution
A saw blade with an elliptical shape and cutting teeth arranged radially along its periphery, where the height of the teeth decreases towards the ends, allowing for efficient cutting with reduced collision risk and enabling the blade to cut both thin and thick wood without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional round saw blade is used for cutting thick wood, then the blade can make a through bore, but the blade tends to roll along on the wood and requires specific working techniques while scattering loose particles at high speed
Solution Approach 1:
The patent inverts the conventional circular rotation motion of saw blades to a reciprocating arcuate swing motion. The saw blade swings back and forth in an arcuate path rather than rotating continuously, which eliminates the rolling effect and high-speed particle scattering while maintaining effective cutting capability for both thin and thick wood.
Solution Approach 2:
The patent applies dynamic reciprocating motion instead of static continuous rotation. The drive shaft generates arcuate swing motion that causes the saw blade to dynamically swing between two positions, creating a reciprocating cutting action that reduces harmful particle scattering and eliminates the rolling effect along the wood surface.
2Productivity
If a saw blade with reciprocating arcuate swing motion is used for cutting thick wood, then cutting can be carried out at the beginning, but the blade collides against sidewalls causing heat generation and deformation
Solution Approach 1:
The patent modifies the tooth height distribution along the saw blade periphery. Teeth at the outer ends (which would collide with sidewalls) are made shorter, while teeth in the central region maintain full height. This local differentiation prevents heat generation and deformation at the collision-prone end regions while preserving cutting effectiveness in the central cutting zone.
Solution Approach 2:
The patent preemptively reduces the height of teeth at positions where collision with sidewalls is expected to occur. By making the outer end teeth shorter before the cutting operation begins, the design prevents the harmful collision effects from occurring in the first place, eliminating heat generation and deformation at these locations.
3Device complexity
If the height of cutting teeth is uniform across the blade, then the blade structure is simple, but the ends collide against sidewalls causing heating and deformation
Solution Approach 1:
The patent implements non-uniform tooth height distribution where teeth at the outer ends are shorter than teeth in the central region. This local quality variation prevents collision-induced heating and deformation at the ends while maintaining structural simplicity overall, achieving better reliability without significantly complicating the blade design.
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4(a)~5C
AI summary
A saw blade (1) for an electric saw tool with a drive shaft making a reciprocating arcuate swing motion, the saw blade (1) comprising a saw plate which has centrally a coupling part (2) for connecting and fixing the saw plate to the drive shaft of the saw tool and has an appearance as being elliptic, and has cutting teeth (11) on the outer periphery. Also, a saw blade (1) for an electric saw tool with a drive shaft making a reciprocating arcuate swing motion, the saw blade (1) having at one end a coupling part (2) for connecting and fixing the saw blade (1) to the drive shaft of the saw tool and having at the other end a line of cutting teeth (11) of the saw blade (1), and height of the cutting teeth (11) near both ends of the line of cutting teeth (11) is smaller than at a central portion of the line of cutting teeth (11).