Reciprocating Saw Blade Geometry for Faster, Lower-Vibration Cutting
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Solution Overview
Problem
Reciprocating saw blades with large tang angles experience reduced cutting speed, poor cut quality, increased vibration, and difficulty in tip cutting due to the increased angle, which also causes the cutting teeth to rub against the saw shoe during operation.
Innovation Solution
The design incorporates an elongated blade body with a cutting edge featuring inclined, declined, and parallel cutting edge portions, along with a tang angle ranging from 3° to 6°, and strategically positioned teeth to optimize cutting performance, including bump teeth for impact resistance, allowing for more aggressive cutting angles without the drawbacks of larger tang angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the tang angle is increased to improve blade life, then blade life is improved, but cutting speed is reduced and vibration increases
Solution Approach 1:
The patent optimizes the tang angle parameter within a specific range (3° to 6°) to achieve a balance between blade life and cutting speed. This parameter optimization allows the blade to withstand operational stresses while maintaining efficient cutting performance, resolving the contradiction between durability and speed.
2Duration of action of moving object
If the tang angle is increased to improve blade life, then blade life is improved, but cut quality deteriorates and vibration increases
Solution Approach 1:
By controlling the tang angle within the optimized range of 3° to 6°, the patent ensures that the blade maintains structural strength for extended life while preserving cut quality. This parameter control prevents excessive vibration and maintains precision during operation.
3Duration of action of moving object
If the tang angle is increased to improve blade life, then blade life is improved, but tip cutting becomes difficult
Solution Approach 1:
The optimized tang angle range (3° to 6°) provides the necessary geometric clearance that enables effective tip cutting operation while still maintaining adequate blade life. This parameter adjustment resolves the conflict between durability and operational versatility.
4Duration of action of moving object
If the tang angle is increased to improve blade life, then blade life is improved, but cutting teeth rub against the shoe
Solution Approach 1:
By optimizing the tang angle to 3° to 6°, the patent creates sufficient clearance between the cutting teeth and the shoe, eliminating harmful friction and rubbing during operation. This parameter optimization simultaneously protects the shoe while maintaining blade durability.
Data Source
AI summary
A reciprocating saw blade includes an elongated blade body extending along a blade axis and having a rear end, a front end, a cutting edge having a plurality of teeth, a non-cutting edge opposite the cutting edge; and a tang coupled to the rear end and configured to be received in a blade holder of a powered reciprocating saw. The cutting edge includes inclined and declined cutting edge portions. The inclined cutting edge portion extends away from the blade axis and toward the front end at an acute first angle and extends from a first tooth to a second tooth. The first tooth is closer to the rear end and closer to the blade axis than the second tooth. The declined cutting edge portion extends toward the blade axis and toward the front end at an acute second angle that is greater than the first angle and extends from a third tooth to the first tooth. The first tooth is closer to the front end and closer to the blade axis than the third tooth.