Malleable Press Fitting Geometry for Fast, Reliable Pipe Joints
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Solution Overview
Problem
Existing cast pipe fittings often require complex installation processes and can have poor structural integrity, leading to potential failures during use, which can be dangerous and costly.
Innovation Solution
A cast body design for pipe fittings with varying wall thickness and tapered inner and outer surfaces to facilitate press-fit connections, incorporating a seal cavity with a grip ring and spacer for secure pipe engagement, allowing for easier installation and improved structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cast pipe fittings are used, then structural integrity may be poor leading to potential failures, but modifying the casting process to improve integrity increases manufacturing complexity and cost
Solution Approach 1:
The patent applies parameter changes by modifying the wall thickness distribution in the casting design. Specifically, it creates varying wall thicknesses (thinner at ends, thicker in middle) and incorporates tapered surfaces with specific angle ranges (15-45 degrees) to optimize both structural integrity and manufacturability. These parameter optimizations allow the fitting to achieve reliable structural performance while maintaining feasibility in standard casting processes.
2Reliability
If traditional pipe fittings requiring multiple bolts are used, then connection reliability improves, but installation time and complexity increase
Solution Approach 1:
The patent extracts and eliminates the need for multiple bolts and complex tightening procedures from traditional pipe fitting installations. By designing a press-fit connection system with tapered surfaces that create mechanical interlocking and seal through radial compression alone, it removes the entire bolt assembly subsystem, thereby dramatically reducing installation time and complexity while maintaining connection reliability.
Solution Approach 2:
The patent replaces the traditional mechanical bolt-tightening system with a press-fit mechanical system based on tapered surface compression. Instead of using threaded fasteners requiring sequential tightening in patterns, it employs conical surfaces that convert axial pressing force into radial clamping force, achieving secure connection through a single pressing action rather than multiple bolt operations.
3Productivity
If stab-in couplings are used for quick installation, then installation speed improves, but connection reliability and seal quality deteriorate
Solution Approach 1:
The patent employs curved/tapered surfaces (conical geometry) in the press-fit connection design. The tapered surfaces with controlled angles create a progressive compression mechanism that ensures uniform radial contact and sealing pressure around the entire circumference during pressing, eliminating the unreliable flat-surface contact of stab-in couplings while maintaining installation speed advantage.
Data Source
AI summary
A cast body for a pipe fitting includes a first body end and a second body end disposed opposite from the first body end. The body defines an axis extending from the first body end to the second body end, an inner body surface defining a fitting bore that extends through the body, and an outer body surface spaced from the inner body surface at a predetermined wall thickness. At a first location on the axis, the inner body surface is a first distance and the outer body surface is a third distance from the axis, and at a second location on the axis that is proximate to the first body end, the inner body surface is a second distance from the axis that is greater than the first distance and the outer body surface is a fourth distance from the axis that is less than the third distance.