Push-Fit Pipe Connection Verification Mechanism
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Solution Overview
Problem
Existing connection devices for plastic pipes fail to provide a reliable method to verify correct insertion of the pipe end into the clamping sleeve after initial assembly, especially in difficult-to-access locations, and require additional inserts that complicate the process.
Innovation Solution
A one-piece stop is integrated with the clamping sleeve, held by a predetermined breaking point, allowing radial displacement only after the breaking point is released, enabling verification of correct insertion both during and after pipe removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate insert with a stop is used in the clamping sleeve, then the stop can provide visible indication of correct insertion, but the device complexity increases and additional components are required
Solution Approach 1:
The stop is integrated directly into the clamping sleeve as a one-piece component, eliminating the need for separate inserts. The stop forms an integral part of the clamping sleeve structure, allowing it to provide verification functionality while reducing device complexity and component count.
2Reliability
If the stop is held by a predetermined breaking point, then post-removal verification is enabled, but the stopping mechanism becomes more complex
Solution Approach 1:
A predetermined breaking point is intentionally designed into the stop structure during manufacturing. This breaking point is prepared in advance to allow the stop to be held in a specific position during assembly, and to enable verification of correct insertion even after the pipe is removed from the fitting.
3Loss of information
If the stop is designed to be displaced radially outward through the opening, then visible indication is provided, but the stop mechanism requires additional structural elements
Solution Approach 1:
The stop is formed as an integral part of the clamping sleeve structure, merging the indication function with the existing clamping mechanism. The stop utilizes the opening already present in the clamping sleeve for visual verification, eliminating the need for separate indication structures.
Data Source
AI summary
An improved push fit pipe connection, e.g. for water pipe etc., has the end (4) of the pipe pushed into a locking position between a nipple (1) and an outer clamping sleeve (2). The nipple and sleeve are linked and a tag (7) is provided in the inner end of the sleeve. The tag is attached to the sleeve by a film hinge (11) and by shear connections. The end (4) of the pipe has a recess (8), or slot, and as the pipe is pushed onto the nipple the tag is first displaced outwards, breaking the shear connections and then drops into the recess thuds providing a clean indication that the pipe has been pushed fully into the connection.