Indexable Demolition Shear Blade With Full Tang Shrouding
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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 leads to inefficiencies and maintenance issues.
Innovation Solution
A single-piece, indexable demolition shear blade with five walls that shrouds the tang of the moveable jaw, featuring reversible piercing tips and a secure fitting system to prevent separation and reduce friction, made from hardened steel for increased durability and longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-part blade assembly is used to surround the tang, then the blade can fit tightly around the tang, but a line of weakness is created at the join line that is prone to separation on impact
Solution Approach 1:
The patent merges two separate blade parts into a single monoblock blade structure. This eliminates the join line between parts that creates a line of weakness, while maintaining the ability to surround and protect the tang. The single continuous structure provides superior structural integrity and resistance to impact forces without the separation risk inherent in multi-part assemblies.
2Manufacturing precision
If a two-part blade assembly is used, then the blade can be constructed with first and second blades, but the assembly is costlier during production requiring precision machining and often manual filing
Solution Approach 1:
By combining the blade into a single monoblock structure, the patent eliminates the need for precision mating surfaces and manual filing operations required for multi-part assemblies. The single-piece construction requires only one set of precision machining operations rather than multiple coordinated machining processes, significantly reducing production costs and complexity while maintaining high manufacturing precision.
3Object-affected harmful factors
If a two-part blade assembly encases the tang, then the blades can be attached to the tang, but a portion of the bridging front face of the tang is not adequately protected and is subject to damage
Solution Approach 1:
The monoblock blade design provides continuous, uninterrupted protection around the entire tang structure including the bridging front face. Unlike two-part assemblies that leave gaps at the join line and between parts, the single continuous blade structure completely encases the tang, eliminating unprotected areas and providing comprehensive protection against damage from all directions.
4Productivity
If a single piercing edge is provided on the blade, then the blade structure is simpler, but the blade has to be replaced frequently reducing productivity
Solution Approach 1:
The patent incorporates multiple piercing edges on a single monoblock blade, allowing the blade to be rotated and reused with different edges as they become worn. This dynamic reuse capability significantly extends blade service life and reduces replacement frequency. The additional complexity of multiple edges is minimal compared to the substantial productivity gains from blade reuse rather than frequent replacement.
Data Source
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.