Cast Press Fitting Geometry for Stronger Pipe Connections
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Solution Overview
Problem
Existing cast pipe fittings can be difficult to install and may have poor structural integrity, leading to potential failures during use.
Innovation Solution
A cast body for a pipe fitting with a specific geometry, including a first body end and a second body end, an inner body surface defining a fitting bore, and an outer body surface with varying distances from the axis, designed to facilitate press fitting and improve structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cast pipe fittings are used, then manufacturing is simpler, but structural integrity is poor leading to potential failures
Solution Approach 1:
The patent applies local quality by varying the wall thickness at different locations of the casting. The body includes a first wall thickness at a first location and a second wall thickness at a second location, where the thicknesses differ. This non-uniform thickness distribution strengthens critical areas prone to failure while maintaining manufacturability through controlled casting processes.
2Reliability
If complex geometric features are added to improve fit and seal, then connection reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes by specifying precise geometric parameters including the varying wall thicknesses, the angles of tapered surfaces, and the dimensions of sealing features. These parameter variations are designed to achieve reliable connections through press-fitting while remaining compatible with standard casting manufacturing capabilities.
3Productivity
If press fitting method is used, then installation speed improves, but structural integrity during installation may be compromised
Solution Approach 1:
The patent applies preliminary action by incorporating design features into the casting itself that prepare the fitting for press-installation. The varying wall thicknesses and reinforced geometric features are built into the casting structure before installation, enabling quick press-fitting while maintaining structural integrity during and after installation without requiring additional reinforcement steps.
Data Source
AI summary
An unmachined cast body for a pipe fitting, the cast body includes a first body end and a second body end disposed opposite from the first body end, the cast body defining an axis extending from the first body end to the second body end, the cast body defining a midpoint between first body end and the second body end, a centerline of the cast body defined at the midpoint perpendicular to the axis, a first distance from the centerline to the first body end being equal to a second distance from the centerline to the second body end, an inner body surface defining a fitting bore extending through the cast body from the first body end to the second body end, and an outer body surface spaced from the inner body surface, the outer body surface defining a first frustoconical shape and a second frustoconical shape.