Shrouded Pipe Coupling Assembly With Visual Engagement Check
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Solution Overview
Problem
Existing mechanical couplings for joining pipe elements face challenges in ensuring proper assembly, particularly when pipes are out of round or grooved incorrectly, leading to potential misuse of high-torque tools and unintended stress on bolts and nuts, and lack of visual indicators for complete assembly.
Innovation Solution
The coupling design features shrouds and recesses on opposing faces of segment attachment members, with index marks for alignment, and a hinge mechanism to ensure proper assembly, providing visual confirmation of complete engagement without planar face-to-face contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the coupling is assembled with planar face-to-face contact of inner faces to signal complete assembly, then visual indication of proper tightening is provided, but the coupling cannot accommodate pipes that are out of round, grooved incorrectly, or out of specification
Solution Approach 1:
The patent introduces a visual dimension by incorporating sight holes through the coupling body that allow observation of the gap between pipe ends. This enables visual confirmation of proper assembly (when gaps are visible) without requiring planar face-to-face contact, thus resolving the contradiction between visual indication and adaptability to non-conforming pipes
2Productivity
If battery powered impact wrenches are used to apply high torque to bolt and nut assemblies, then assembly speed is increased, but very little physical feedback is provided to the installer about the torque being achieved, leading to potential over-tightening
Solution Approach 1:
The patent provides visual feedback through the sight holes that allow the installer to observe the gap between pipe ends during tightening. This visual feedback mechanism enables the installer to stop tightening when the appropriate gap is visible, preventing over-tightening while still allowing the use of high-torque impact wrenches for efficient assembly
3Measurement precision
If excessive tightening is applied to achieve planar face-to-face contact in non-planar conditions, then complete visual assembly indication is achieved, but unintended high stresses are created within the bolt and nut assemblies
Solution Approach 1:
The patent shifts from requiring contact in one dimension (planar face-to-face contact) to observing gap dimensions through sight holes. This allows determination of assembly completion based on visible gap measurements rather than forcing planar contact, thereby preventing excessive stresses on fasteners while still providing precise assembly completion indication
Data Source
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AI summary
Couplings for joining pipe elements have segments with attachment members with faces which contact one another when the segments are properly installed on the pipe elements. Each segment has one or more shrouds and recesses positioned along the faces. The shrouds on one segment are received within respective recesses on the other segment. The shrouds block the line of sight toward the central space which the segments surround and which receives the pipe elements. Index markings on the segments show visual inspection points to confirm proper engagement between the segments and the pipe elements.