Swaged Pipe Fitting With Tactile Threaded Engagement Check
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Solution Overview
Problem
Plumbing joints in plastic pipes are often difficult to verify as fully engaged due to obscured visibility, leading to potential leaks or failures, especially in hard-to-reach areas, as the swageable metal collar hides the ridges and makes it hard to confirm proper seating by feel.
Innovation Solution
The pipe fitting assembly features asymmetric threaded sections with a sharp crest and distinct angles, allowing engagement confirmation by feel through increased resistance and rotation monitoring, ensuring proper seating before swaging, and includes a method to pull the pipe off to verify positive engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a swageable metal collar is used to secure the pipe, then the joint becomes water-tight and reliable, but the collar obscures the ridges and prevents the plumber from seeing if the pipe is pushed fully home
Solution Approach 1:
A threaded indicator section is introduced as an intermediary element between the pipe and the swageable collar. This indicator section provides tactile feedback through thread engagement, allowing the plumber to verify proper pipe insertion depth without visual observation, thus solving the obscuration problem while maintaining joint reliability
Solution Approach 2:
The visual detection method is replaced with a tactile/mechanical detection system. The threaded indicator section engages with the pipe threads, and the resistance felt during rotation provides mechanical feedback that confirms proper engagement, substituting the need for visual detection through the collar
2Ease of operation
If an indicator ring is added to provide tactile feedback, then the installer can feel when the pipe is pushed far enough, but it is difficult to distinguish whether the resistance is from the indicator ring or from other ridges
Solution Approach 1:
The indicator section features an asymmetric thread form with a sharp crest and specific angle geometry that differs from the swaging ridges. This asymmetric design creates a distinct tactile sensation during rotation that is easily distinguishable from the resistance felt when engaging the swaging ridges, enabling precise verification of pipe insertion depth
Solution Approach 2:
The indicator section is designed with localized specific features (threaded portion with distinct geometry) that provide unique tactile feedback only at the intended insertion depth, while other portions of the fitting have different surface characteristics for swaging. This local differentiation ensures accurate detection of proper engagement
3Adaptability or versatility
If work is performed in difficult access situations, then plumbing joints can be made in tight and awkward locations, but it becomes hard to see whether the pipe and fitting have been mated together properly
Solution Approach 1:
Visual detection of proper engagement is replaced with tactile/mechanical detection through the threaded indicator section. The distinct tactile feedback from thread engagement provides verification of proper mating without requiring visual observation, enabling reliable installation in dark or difficult-to-reach locations
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A swaged pipe fitting (13) has a tail (15) extending from a shoulder (31) of the fitting. The tail (15) having a plurality of sealing ribs (21) to engage with a pipe (not shown) as it is pushed over the tail and below a swageable collar (not shown in Figure 1) attached to the fitting (13), and a threaded indication system (37) to help the installer feel for a positive engagement and to hold the pipe securely on the fitting until the collar is swaged over the end of the pipe. The threaded indication system (37) has one or more external asymmetric threads (37) situated between the sealing ribs (21) of the fitting and a shoulder (31) of the fitting, and engagement with the threads (37) can be felt in a plurality of ways to help the installer to make secure joints with greater consistency.