Segmented Reciprocating Saw Blade for Chip Removal and Blade Life
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Solution Overview
Problem
Conventional saw blades face limitations in durability, cutting efficiency, and accuracy due to uniform tooth forms and lack of innovative designs that enhance performance when cutting through materials like metal and wood.
Innovation Solution
The development of a reciprocating saw blade with a body and attachment portion designed for power tools, featuring a cutting portion with varied cutting teeth, gullets, and strategically placed slots that separate the cutting edge into segments, allowing for improved cutting performance and chip removal, and utilizing carbide or high-speed steel for enhanced hardness and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform tooth forms are used on the saw blade, then manufacturing is simplified, but cutting efficiency and durability are reduced
Solution Approach 1:
The patent applies local quality by varying tooth forms along the cutting portion of the blade. Different tooth forms are positioned at different locations to optimize cutting performance for specific materials and cutting directions, while maintaining manufacturing feasibility through systematic variation rather than complete complexity
Solution Approach 2:
The cutting portion is divided into multiple segments with different tooth forms (e.g., first cutting teeth with first tooth forms, second cutting teeth with second tooth forms). This segmentation allows each segment to be optimized for specific cutting functions while maintaining overall manufacturing efficiency
2Productivity
If slots are added to separate cutting segments, then chip removal is improved, but device complexity increases
Solution Approach 1:
The blade structure is segmented into multiple cutting segments separated by slots. This segmentation creates channels for chip removal while maintaining a modular structure that can be manufactured using standard processes, balancing complexity with functional benefit
Solution Approach 2:
Material is extracted to form slots that run through the blade body, creating pathways for chip removal. This extraction of material creates the necessary channels without requiring additional components, maintaining structural integrity while enabling improved chip evacuation
3Reliability
If carbide or high-speed steel is used for cutting teeth, then durability and hardness are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The blade uses composite construction with carbide or high-speed steel cutting teeth attached to a metal blade body. This composite approach provides the hardness and durability of carbide where needed while maintaining the manufacturability and toughness of the metal body, optimizing the balance between durability and manufacturing ease
Solution Approach 2:
The cutting teeth are treated as separate segments that can be manufactured and attached independently from the blade body. This allows specialized materials like carbide to be applied only where cutting performance is needed, rather than requiring the entire blade to be made from difficult-to-manufacture materials
Data Source
AI summary
A reciprocating saw blade includes a body including a first end portion, a second end portion opposite the first end portion, and a coupling edge extending between the first and second end portions. The body defines a longitudinal axis extending through the first and second end portions. The reciprocating saw blade also includes an attachment portion coupled to the first end portion of the body and a cutting portion coupled to the coupling edge of the body. The cutting portion includes a plurality of cutting teeth and a plurality of gullets. Moreover, the reciprocating saw blade includes a plurality of slots spaced along the cutting portion to separate the cutting portion into a plurality of cutting segments including a distal end segment adjacent the second end portion of the body. The distal end segment extends beyond the coupling edge of the body in a direction parallel to the longitudinal axis.