Plastic Pipe End Fitting With Asymmetric Threaded Sealing
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Solution Overview
Problem
Existing protective plastic pipe end fitting systems require significant manual effort for installation, particularly due to the need for multiple turns to secure the fitting system effectively.
Innovation Solution
The protective plastic pipe end fitting system incorporates a first engaged helical thread creating portion with an asymmetric cross-section, allowing for rapid installation by reducing the number of turns required to achieve a secure seal. This design includes a low inclination stab flank, a crest ridge, and a steep load flank, optimizing the thread geometry for efficient pipe engagement and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional helical thread creating portion is used, then the fitting system provides reliable sealing and pull-out resistance, but the installation requires multiple turns and significant manual effort
Solution Approach 1:
The helical thread creating portion employs asymmetric cross-sectional geometry with a low inclination stab flank and a steep load flank. This asymmetry allows the thread to cut into the pipe wall more efficiently during rotation, reducing the number of turns needed to achieve secure engagement while maintaining reliable pull-out resistance and sealing performance.
Solution Approach 2:
The invention modifies the geometric parameters of the helical thread creating portion, specifically the angles of the stab flank and load flank. By optimizing these angular parameters, the thread creates more effective cutting action and engagement with the pipe wall, thereby reducing installation effort and increasing installation speed without compromising sealing or pull-out resistance.
2Productivity
If the number of installation turns is reduced, then installation efficiency improves, but the secure seal and pull-out resistance may be compromised
Solution Approach 1:
The asymmetric thread geometry with its distinctive stab flank and load flank angles enables more effective material displacement and engagement per unit of rotation. This allows the fitting to achieve full sealing and pull-out resistance with fewer turns, thereby improving installation speed without compromising reliability.
Solution Approach 2:
The helical thread creating portion utilizes curved, three-dimensional geometry that optimizes the contact and cutting action between the thread and pipe wall. This curved geometry distributes the engagement forces more effectively, achieving reliable sealing and pull-out resistance with reduced rotational input.
3Loss of time
If the thread geometry is optimized for rapid engagement, then installation time decreases, but the complexity of thread design increases
Solution Approach 1:
While the asymmetric geometry does increase design complexity, it dramatically reduces installation time by enabling more efficient cutting and engagement. The specific angular parameters of the stab and load flanks are optimized to achieve rapid securement, trading moderate design complexity for significant time savings in the installation process.
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 improved thread geometry reduces the number of turns needed for installation, making the process more efficient and less labor-intensive while ensuring a reliable seal and increased pull-out resistance for the plastic pipe.
Implementation Method 1
the housing has a least one first engaged helical thread creating portion that is arranged in the pipe bore. This first engaged helical thread creating portion is first into engagement with the end portion of the protective plastic pipe upon said entry of the protective plastic pipe into the pipe bore via the insertion end thereof. The first engaged helical thread creating portion is adapted to create a helical thread having a lead into the exterior of the protective plastic pipe upon screwing the fitting system onto the end portion of the protective plastic pipe
Implementation Method 2
Upon continuing said screwing the compressible sealing member becomes compressed thereby narrowing the one axial passage therein and sealing onto the cable passing there through and providing strain relief for the cable, as well as sealing onto the end of the protective plastic pipe
Data Source
Figure 1a~1d
Figure 2a~2d
Figure 2e
AI summary
A protective plastic pipe end fitting system to be mounted at an end portion of a protective plastic pipe into which at least one elongated object, for example a cable or another, smaller diameter, plastic pipe, passes. The system comprises a housing of one or more rigid plastic housing parts and a compressible sealing member. The housing delimits a pipe bore and a sealing member receiving chamber. The sealing member body is split and the pipe bore is laterally open allowing to mount the sealing member and the housing about an elongated object that extends from the end portion of the protective pipe. The housing has a least one first engaged helical thread creating portion which is adapted to create a helical thread having a lead into the exterior of the protective plastic pipe upon screwing the fitting system onto the end portion of the pipe. The pipe comes into contact with the pipe contacting end face of the sealing member and upon continuing said screwing the compressible sealing member becomes compressed thereby sealing onto the end of the pipe.