Plastic Half-Shell Pipe Connector with Integrated Claw Fixation
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Solution Overview
Problem
Existing pipe connecting devices for thin-walled plastic pipes lack axial fixation, requiring additional space and thicker pipe designs, making them unsuitable for confined installations, especially in domestic drainage systems.
Innovation Solution
A pipe connection device featuring two plastic half-shell holding elements with radially projecting claw elements that fit over the spigot end, providing secure axial fixation without damaging the pipe and allowing for easy assembly and space-efficient installation, with optional snap connections, screws, or flexible elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal claws or clamps are used for axial fixation, then axial fixation is achieved, but space requirement increases and pipe wall thickness must be increased
Solution Approach 1:
The patent changes the material parameter from metal to plastic and the structural parameter from external clamps to integrated claw elements. The claw elements are designed with specific geometric parameters (width, height, spacing) that can be optimized based on pipe wall thickness, allowing the same device to work with thin-walled pipes without increasing space requirements.
Solution Approach 2:
The claw elements are nested within the holding element structure itself, integrated into the plastic body rather than being separate external components. This nesting eliminates the need for additional space outside the pipe diameter while maintaining the axial fixation function.
2Reliability
If metal claws or clamps are used for axial fixation, then axial fixation is achieved, but pipe wall thickness must be increased
Solution Approach 1:
The patent changes the material parameter from metal to plastic, which has different mechanical properties suitable for thin-walled pipes. The claw element geometry parameters are specifically designed to match thin wall thicknesses, with dimensions that can be scaled down for thinner walls while maintaining fixation reliability.
Solution Approach 2:
The claw elements are designed with localized engagement features that concentrate the fixation force on specific areas of the pipe wall. The local geometry of the claw tips and the spacing between claws are optimized to distribute stress appropriately for thin-walled pipes, preventing wall damage while achieving secure fixation.
3Ease of manufacture
If conventional pipe connection devices are used, then connection is achieved, but axial fixation is insufficient
Solution Approach 1:
The patent merges the sealing function and axial fixation function into a single integrated device. The holding element with integrated claw elements simultaneously provides both sealing (through contact with the pipe outer surface) and axial fixation (through the claw elements pressing into the pipe wall), eliminating the need for separate fixation components.
Solution Approach 2:
The fixation function is segmented into multiple discrete claw elements distributed around the circumference of the holding element. This segmentation allows each claw to engage independently with the pipe wall, providing distributed axial fixation that is more reliable than a single continuous clamp while maintaining manufacturing simplicity.
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 device ensures secure, space-saving connection and prevention of unintentional loosening, suitable for thin-walled pipes, with adaptable claw design and optional anti-twist features, facilitating easy installation and use in confined spaces.
Implementation Method 1
at least one radially inwardly projecting claw element, which protrudes over the bearing surface and which is pressed into the surface of the spigot end of the plastic pipe when the pipe connection device is clamped
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A pointed end (2) is inserted into a socket sleeve (1). Half shell-shaped holders enclose the connected portion of the pointed end and socket sleeve until the free ends of the holders abut. The holders are manufactured from plastic and have a partly cylindrical bearing surface that is abutted against the outer surface of the pointed end. Claws protrude from the bearing surface of each holder.