Reciprocating Saw Blade with Multiple Tangs and Scored Segments

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Solution Overview

Problem

Traditional reciprocating saw blades have a shorter useful life due to faster wear on the cutting edge closest to the tang, limiting the utilization of the entire cutting edge.

Innovation Solution

A saw blade design featuring multiple tangs, where additional tangs are exposed by breaking off portions of the blade body along scores, allowing the cutting edge closest to each tang to be used after the rearward edge has worn out, thereby extending the blade's life.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Duration of action of moving object

If a single tang is used to attach the saw blade to the reciprocating saw, then the blade structure is simple and easy to manufacture, but the cutting edge closest to the tang wears faster and the blade life is limited

Engineering Contradiction:

Improveblade lifeVSAvoidblade structure

Core Design Contradiction:

Duration of action of moving objectVSDevice complexity

Solution Approach 1:

The blade body is segmented into multiple sections separated by scores, allowing the blade to be divided into multiple usable portions. Each portion has its own tang, enabling sequential use of different cutting edge sections after breaking off worn portions along the scores.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Scores are pre-formed in the blade body during manufacturing at predetermined locations. These scores create predetermined break points that allow easy separation of blade portions, enabling the user to extend blade life by breaking off worn sections and exposing fresh cutting edges.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the cutting edge is moved in both directions for cutting, then the blade can cut in both directions, but the rearmost portion of the cutting edge wears faster due to being used most

Engineering Contradiction:

Improvecutting directionVSAvoidcutting edge wear

Core Design Contradiction:

Adaptability or versatilityVSLoss of substance

Solution Approach 1:

The cutting edge is divided into multiple sections corresponding to different tang positions. As each section wears from use, the user breaks off that section along a score, exposing a fresh section of the cutting edge with a new tang, thereby resetting the wear cycle.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The worn portion of the blade is discarded by breaking it off along the score, while the remaining portion with fresh cutting edge is recovered and continues to be used. This allows the valuable cutting edge material to be fully utilized across multiple tang sections.

Inventive Principle:

Principle #34Discarding and recovering

Data Source

PatentUS10646937B2Saw blade with multiple tangs and methods of use

Publication Date: 2020.05.12 BLACK & DECKER CORP

AI summary

A method of using a reciprocating saw blade having an elongated body with a front body portion and a rear body portion, each having a front end, a rear end, an elongated cutting edge extending between the front and rear ends and a back edge opposite the cutting edge. A first tang that extends from the rear end of the rear body portion may be coupled to a reciprocating saw. The saw blade may be removed from reciprocating saw, and a second tang, which extends from the rear end of the front body portion, may be exposed by breaking off an entirety of the rear body portion in a single integral piece from the front body portion. The front body portion, without the rear body portion, may be coupled to the reciprocating saw by coupling the exposed second tang to the reciprocating saw.