Hybrid Push-to-Connect Fitting Resists Rotational Torque
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Solution Overview
Problem
Push-fit technologies in piping systems lack a stopping force to prevent rotation of fittings about inserted tubing elements, which is crucial for stability, strength, and durability, especially in applications like fire suppression systems.
Innovation Solution
A hybrid push-to-connect fitting device featuring a sealing member gasket insert, fastening ring, retaining ring, release pusher, shoe member, and nut connector, which collectively resist up to thirty foot-pounds of rotational torque and prevent rotation of the fitting during application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If push-fit technology is used to simplify piping connections, then ease of operation and safety are improved, but the fitting lacks rotational stability and stopping force
Solution Approach 1:
The patent employs multiple nested components within the fitting: an inner grip ring with teeth that grip the pipe, an outer grip ring, and a collet nested within. These nested elements work together to provide both the ease of push-fit connection and the rotational stability through cumulative gripping force and structural interlocking
Solution Approach 2:
The fitting is divided into multiple functional segments: a body portion, an inner grip ring, an outer grip ring, and a collet. Each segment performs a specific function - the inner grip ring provides initial gripping and rotation prevention, while the outer grip ring and collet provide additional stabilization. This segmentation allows the fitting to achieve both ease of operation and rotational stability
2Strength
If traditional soldering methods are used to ensure strong joints, then connection strength is improved, but time consumption and labor intensity increase
Solution Approach 1:
The patent replaces the thermal-mechanical soldering process with a purely mechanical connection system. The inner and outer grip rings with teeth, along with the collet, create a mechanical interlocking structure that provides joint strength equivalent to soldering but without the time-consuming heating and soldering steps. The mechanical gripping force directly secures the pipe to the fitting
Solution Approach 2:
The push-fit connection system is self-securing through the inherent elasticity and gripping mechanism of the collet and grip rings. When the pipe is inserted, the collet automatically expands and the grip rings engage the pipe surface, creating a strong mechanical bond without requiring external tools, heat, or additional materials. This self-service mechanism dramatically reduces connection time while maintaining joint strength
Data Source
AI summary
A fitting device includes a fitting body having an interior surface defining an interior, a packing assembly maintained within the fitting body interior, a retaining nut, and a shoe member maintained between the retaining nut and the axially outer rim of the fitting body, whereupon inserted tubes or pipes can be securely inserted into the fitting interior and maintained therein.