Open Ended Pipe Cap With Recessed Finger Grip And Tear Strip
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Solution Overview
Problem
Open-ended pipe caps for industrial pipes, particularly OCTG, are difficult to install and remove, often falling off during transportation and handling, and may damage pipe threads due to excessive interference or undersizing.
Innovation Solution
A flexible open-ended cap with a tubular body featuring a radial rim, finger grip, tear strip, and compressible longitudinal fit beads that provide secure engagement and easy removal by tearing the strip, allowing for snug fit and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cap is intentionally undersized to provide higher interference fit, then the cap is more secure and less likely to fall off, but the cap becomes very difficult to remove and may damage the pipe threads
Solution Approach 1:
The cap incorporates a pre-designed tear strip that allows for easy removal without damaging the pipe threads. The tear strip is intentionally created as a weak point in the cap structure, enabling the cap to be pulled off cleanly when force is applied to the finger grip member, thus resolving the contradiction between secure fit and easy removal.
Solution Approach 2:
The cap is designed as a disposable protective element where the tear strip is meant to be broken during removal. The finger grip member provides a convenient point for applying force to tear the strip, allowing the cap to be discarded easily after its protective function is complete, without harming the valuable pipe threads.
2Ease of manufacture
If the cap has uniform wall thickness, then the cap is easy to manufacture, but the cap is difficult to install and frequently falls off during transportation and handling
Solution Approach 1:
The cap features localized structural variations including a radial rim at the open end and a finger grip member that extends inwardly from the rim. These localized features provide enhanced engagement with the pipe and improve retention during handling, while the majority of the cap body maintains uniform wall thickness for ease of manufacture.
3Object-affected harmful factors
If the cap provides secure interference fit, then the cap protects the pipe threads, but the cap becomes difficult to install and may require tools that damage the threads
Solution Approach 1:
The cap incorporates a pre-designed tear strip that allows for easy removal without damaging the pipe threads. The tear strip is intentionally created as a weak point in the cap structure, enabling the cap to be pulled off cleanly when force is applied to the finger grip member, thus resolving the contradiction between secure fit and easy removal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cap is easily installed and removed with a single motion, providing secure protection and impact resistance while minimizing thread damage, and can be used with a closed end cap for complete sealing.
Implementation Method 1
The tubular body preferably has an interior wall surface having multiple compressible longitudinal fit beads extending inwardly from the interior wall surface... the beads being configured to provide contact along the longitudinal surface of the beads with pipe threads
Data Source
AI summary
An open ended cap for a pipe is provided comprising a flexible tubular body wherein one end has a downwardly-extending radial rim. The tubular body includes a finger grip member recessed from the end of the cap and extending inwardly from an inner periphery of the rim and connected to a tear strip extending across the rim and downwardly along at least a portion of the tubular body. The tubular body optionally has an interior wall surface having multiple compressible longitudinal fit beads which are configured to provide contact with the external surface of a pipe upon being inserted into the end cap. The open ended cap may be used in conjunction with a closed end cap fit within the bore of the pipe to maximize protection of both the exterior and interior of the pipe.