Grooved Pipe Coupling With Limited Rotation for Visual Assembly Check
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Solution Overview
Problem
Existing mechanical couplings for grooved pipes face challenges in ease of assembly and lack consistent visual indication of proper installation, leading to potential misalignment and reduced joint rigidity in bending and torsion.
Innovation Solution
A coupling design featuring adjustable fasteners, angled action and support surfaces, and stop surfaces that rotate segments relative to each other, providing visual confirmation of proper installation through engagement of arcuate projections with pipe grooves and limiting rotation to ensure secure joint formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If angularly oriented interface surfaces are used to cause segments to rotate relatively to one another, then joint rigidity in bending and torsion is improved, but ease of assembly deteriorates
Solution Approach 1:
The coupling segments are pre-configured with angularly oriented action surfaces and stop surfaces that automatically guide the rotation and alignment process during assembly. The preliminary geometric configuration eliminates the need for manual alignment operations, allowing workers to simply draw the segments together and the built-in surfaces automatically perform the rotation and positioning functions.
Solution Approach 2:
The angularly oriented action surfaces and stop surfaces are designed to automatically perform the alignment and rotation functions without external intervention. As the segments are drawn together by the fastening operation, the action surfaces self-generate the rotational motion and the stop surfaces self-limit the rotation, making the system self-aligning and self-regulating.
2Strength
If angularly oriented interface surfaces are used to cause segments to rotate relatively to one another, then joint rigidity in bending and torsion is improved, but visual indication of proper installation consistency deteriorates
Solution Approach 1:
The stop surfaces are positioned and oriented to provide a visible visual indication when proper rotation and engagement have occurred. The geometric configuration creates a consistent visual signal (such as alignment marks or visible engagement features) that confirms correct installation, allowing for easy verification of proper assembly regardless of the specific pipe or coupling instance.
3Strength
If rotation is allowed to lock keys into circumferential grooves, then joint rigidity is improved, but sensitivity to installation procedures increases
Solution Approach 1:
The action surfaces are oriented at specific asymmetric angles (first angle and second angle with opposite slopes) relative to the fastener longitudinal axes. This asymmetric geometry creates a deterministic rotation path that is insensitive to variations in installation technique, ensuring that the segments rotate to the correct position regardless of the specific assembly method used.
Solution Approach 2:
The stop surfaces are pre-positioned to automatically limit rotation at the correct angle, eliminating the need for precise control or monitoring during the assembly process. The preliminary geometric configuration ensures that rotation is naturally constrained to the optimal angle for key engagement, making the installation process robust against procedural variations.
Data Source
AI summary
A pipe coupling has two segments with angularly oriented action surfaces in facing relationship. The action surfaces induce relative rotation between the segments when the segments are drawn together to engage the pipe elements being joined. Attachment elements on each segment, in the form of lugs, accommodate adjustable fasteners which draw the segments together when tightened. Angularly oriented support surfaces on the lugs engage one another and react the fastener force. Stop surfaces are positioned on the lugs adjacent to the support surfaces. Engagement between the stop surfaces limits the relative rotation between the segments.