Rescue Tool Spreader Tip With Composite Insert Elements
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Solution Overview
Problem
Conventional spreader tips for recovery devices face challenges in balancing high bending strength, surface hardness, and wear resistance, often compromising on one property to meet others, leading to quality disadvantages and risk of defects.
Innovation Solution
The design incorporates insert elements with different material properties on the active surface of the spreader tip, allowing for optimized material selection to address specific load types, enhancing wear resistance, compressive strength, and bending strength, while providing resistance to slipping and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the spreader tip is made of high-strength material with high ductility, then bending strength is improved, but surface hardness and wear resistance deteriorate
Solution Approach 1:
The spreader tip is made of composite material consisting of a base material (e.g., steel) and insert elements made of different material (e.g., hard metal, ceramic, or coated material). This composite structure allows the base material to provide bending strength and ductility while the insert elements provide surface hardness and wear resistance, resolving the contradiction between these properties.
Solution Approach 2:
Different regions of the spreader tip are given different material properties: the base material provides overall structural strength, while localized insert elements are placed at the active surface where wear resistance is most needed. This local differentiation of material quality allows simultaneous optimization of bending strength and wear resistance in different areas.
2Reliability
If the surface hardness is increased to improve wear resistance, then wear resistance is improved, but bending strength and ductility deteriorate
Solution Approach 1:
The spreader tip uses composite material construction where hard insert elements (providing wear resistance) are combined with a tougher base material (providing bending strength). This allows the hard surfaces to resist wear while the underlying base material maintains structural integrity and bending strength.
Solution Approach 2:
High surface hardness is applied locally only at the insert elements on the active surface where wear occurs, while the rest of the spreader tip body maintains lower hardness to preserve ductility and bending strength. This localized application of hard material resolves the contradiction between wear resistance and overall strength.
3Strength
If the spreader tip material is optimized for high compressive strength, then resistance to deformation is improved, but surface hardness and wear resistance may be compromised
Solution Approach 1:
The spreader tip employs composite material where the base material provides high compressive strength to prevent deformation, while the insert elements provide the necessary surface hardness and wear resistance. This composite approach allows simultaneous optimization of compressive strength and surface hardness.
Data Source
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AI summary
The invention relates to a spreader tip (32) for replaceable attachment to two pincer-like co-operating spreader arms (4) of a rescue tool (1). Mounted on a working face (35) of the spreader tip (32) is at least one insert element (39) which protrudes from and has different material properties in comparison with the spreader tip (32).