Cam-Driven Ferrule Rotation for Plastic Pipe Socket Expansion
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Solution Overview
Problem
Existing expansion tools for creating sockets on plastic or composite pipes often result in imperfect fits due to material deformation, leading to leaks, and require manual adjustments that are time-consuming and difficult, especially in limited access areas.
Innovation Solution
An expansion tool device that integrates a cam system to transform translational motion into rotational motion, allowing the ferrule to automatically swivel during the expansion process, ensuring minimal deformation and eliminating the need for manual repositioning of chucks, thereby reducing the risk of leaks and saving time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional expansion tools are used to create sockets on plastic or composite pipes, then the pipe end is widened to allow fitment, but material deformation occurs creating internal turgidities that lead to imperfect fitment and leaks
Solution Approach 1:
The cam system is pre-configured to automatically rotate the ferrule during the expansion process, performing the rotation action in advance of the traditional manual method. This preliminary automated action ensures that the ferrule is properly positioned before and during expansion, preventing material deformation and turgidity formation that lead to leaks
Solution Approach 2:
The cam mechanism enables the ferrule to rotate automatically during the expansion process without requiring manual intervention. The system serves itself by converting the linear motion of the expansion tool into rotational motion of the ferrule through the cam profile, eliminating the need for operator rotation actions and ensuring consistent, deformation-free expansion
2Reliability
If manual rotation of the tool is performed to flatten turgidities created during expansion, then leak risk is reduced, but the process becomes time-consuming and difficult in limited access areas
Solution Approach 1:
The cam system automatically performs the ferrule rotation during the expansion process itself, eliminating the need for separate manual rotation steps. The system rotates the ferrule through a portion of a turn automatically as the expansion tool is actuated, saving time and ensuring reliable leak prevention without requiring operator intervention in difficult-to-reach areas
Solution Approach 2:
The invention merges the expansion function and the rotation function into a single integrated operation. The cam mechanism combines the linear actuation of the expansion tool with the rotational movement of the ferrule, so that both actions occur simultaneously during one continuous motion, eliminating the need for separate manual rotation steps
3Manufacturing precision
If the ferrule is rotated manually during expansion, then turgidity effects are reduced, but the process requires user attention and proper alignment of chucks with previously created turgidities
Solution Approach 1:
The cam mechanism automatically manages the ferrule rotation, eliminating the need for user attention and manual alignment. The system self-regulates the rotation angle and timing, ensuring that the ferrule is properly oriented to prevent turgidity formation without requiring the operator to monitor or adjust the process
Solution Approach 2:
The cam profile is designed with specific geometric features that provide inherent feedback control for the ferrule rotation. As the expansion tool actuates the cam, the cam profile automatically controls the rotation angle and speed, ensuring precise alignment and orientation of the ferrule relative to the pipe features, thereby maintaining high fitment quality without complex operational requirements
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 tool achieves nearly deformation-free expansion, ensuring a secure and leak-proof fit without the need for manual repositioning, significantly reducing the risk of leaks and improving efficiency in socket creation.
Implementation Method 1
An expansion tool device that integrates a cam system to transform translational motion into rotational motion, allowing the ferrule to automatically swivel during the expansion process
Implementation Method 2
The nearing to each other of the legs of the pliers, or the actuation of the machine causes the axial displacement of a tapered needle between said chucks, causing the latter to move apart
Implementation Method 3
the end of the pipe should be sufficiently widened in order to allow the fitment before it recovers its shape
Implementation Method 4
the chucks separate from each other, which creates between them grooves into which the material penetrates so as to create internal turgidities
Data Source
AI summary
The present invention is an expansion tool device for pliers or machine for producing sockets at the ends of pipes made out of plastic or composite material, used in the field of plumbing. The device includes a cylindrically-shaped ferrule formed by the tightening of several sector-shaped chucks. The chucks are movable in the radial direction under the action of the insertion between them of a tapered needle movable in axial translation through the actuation of the pliers or machine. The chucks are allowed to pass from a tightened position to a separated position. In an integrated way or in a unit designed capable of being intercalated between the ferrule and the pliers or machine, there is an automatic driver for the ferrule, when the ferrule passes from the separated position to the tightened position, directly or indirectly, in axial swiveling according to a portion of a turn.