Indexable Demolition Shear Blade Without Join-Line Weakness
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Solution Overview
Problem
Existing demolition shear blades with two-part assemblies suffer from frequent replacement needs, high production costs, blade separation, and tang damage due to friction, as well as a line of weakness at the join line, which affects durability and maintenance.
Innovation Solution
A single-piece, indexable demolition shear blade with five walls that can be rotated 180° to provide two piercing tips, featuring a convex inwardly facing surface for secure fit and reduced friction, made from hardened steel to enhance durability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a two-part blade assembly is used to provide multiple piercing edges, then the blade can be reused more times, but the blade becomes prone to separation at the join line and requires precision machining increasing production cost
Solution Approach 1:
The patent merges two separate blade parts into a single monolithic blade structure. The blade is formed as one continuous piece of hardened steel with a unified body that includes both piercing edges, eliminating the join line between parts. This merging resolves the reliability issue by removing the weak point where separation could occur, while still providing multiple piercing edges through the single blade design.
2Shape
If a two-part blade assembly is used to encase the tang, then the blade can surround the tang better, but the tang becomes subject to friction damage and the assembly requires manual filing for compatibility
Solution Approach 1:
The blade is designed as a single monolithic structure that encases the tang, combining what were previously separate blade parts into one unified component. This eliminates the need for manual filing and precision fitting of multiple parts, as the single blade can be manufactured with the appropriate geometry directly during production.
3Strength
If a single-piece blade is used to eliminate the join line, then the blade strength is increased, but the blade cannot provide multiple piercing edges for extended use
Solution Approach 1:
The blade incorporates multiple piercing edges (first and second piercing edges) within a single monolithic structure. The blade body includes both edges as integral features, allowing the blade to be rotated and reused with different edges while maintaining the strength benefits of a single-piece construction without any join lines.
4Object-affected harmful factors
If a two-part blade assembly is used to provide tight fit around tang, then the blade protects the tang better, but the assembly creates excessive friction and requires costly maintenance of the tang
Solution Approach 1:
The single-piece blade design provides continuous protection around the tang without the gaps or misalignments that occur with multi-part assemblies. The unified structure reduces friction by eliminating the need for tight tolerances between multiple components, thereby reducing wear on the tang while maintaining protective coverage.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 3a~3b
AI summary
A single-piece, indexable or repositionable tip blade for a demolition shear is disclosed which substantially or completely shrouds the tang of the moveable jaw on five-sides. According to the invention, the single piece defines a first and a second piercing edge such that the blade is reversible and can be rotated and provides two edges for shearing. The demolition blade is a one piece, join line free structure which shrouds the entire tang, to allow for maximum results whilst piercing. The single-piece demolition shear blade comprising a blade body (401), said blade body comprising a cavity for receiving the tang of a moveable jaw of a demolition shear therein; said blade body having spaced apart first (413) and second (414) piercing edges; said indexable demolition shear blade being removably attachable to a jaw of a demolition shear in either a first or a second position; the indexable demolition shear blade being rotatable 180° between said first and second position; wherein, in said first position, said first piercing edge (413) is presented for piercing use and in said second position said second piercing edge (414) is presented for piercing use; and in either the first or the second position, the single-piece demolition shear blade substantially shrouds the tang of said moveable jaw of a demolition shear.