Flexible Pipe Splitter Cutter Navigating Tight Bends
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Solution Overview
Problem
Existing pipe splitters require excessive pulling forces and often fracture when navigating tight bends in small diameter pipes, leading to increased labor and costs due to the need for frequent replacement of expensive, hardened steel components.
Innovation Solution
A pipe splitting assembly with a cutter and expander system featuring dual blades with a flexible joint, allowing the cutter to rotate and navigate bends while the expander follows, reducing stress and enabling consistent cutting without direct engagement of the pipe end, thus minimizing pulling force and preventing fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If traditional cutting surfaces engage against the end of the pipe and are pulled longitudinally to split the pipe, then the pipe can be split, but large pulling forces are required which may move the pipe through soft soil instead of splitting the pipe material
Solution Approach 1:
Instead of engaging the cutting surface against the end of the pipe and pulling longitudinally, the patent inverts the approach by engaging the cutting surface against the side wall of the pipe and pulling axially through the pipe. This inversion changes the force application method from end-grabbing to side-cutting, allowing the pipe to be split without requiring excessive pulling forces that would move the pipe in soft soil.
Solution Approach 2:
The patent uses a molded cutter made of polyurethane or similar material that replicates the cutting function of traditional hardened steel cutters. This copying approach with a different material (polyurethane instead of steel) achieves consistent cutting performance without requiring large pulling forces, solving the contradiction between cutting effectiveness and force requirements.
2Adaptability or versatility
If an elongate pipe splitter is used to navigate tight bends in small diameter pipes, then the pipe can be accessed, but the pipe splitter experiences stress and sometimes fractures within the pipe requiring extraction and replacement
Solution Approach 1:
The pipe splitter is divided into multiple separable components: a cutter section and an expander section connected by a flexible element. This segmentation allows the cutter to navigate tight bends independently while the expander follows, reducing stress concentration and preventing fractures in any single component.
Solution Approach 2:
A flexible element (such as a flexible rod or cable) connects the cutter and expander, allowing the assembly to bend and navigate tight corners in pipes. This flexible connection prevents the rigid stress transmission that would cause fractures in elongate pipe splitters attempting to navigate bends.
3Manufacturing precision
If hardened steel pipe splitters are used for cutting, then consistent cutting can be achieved, but the components are expensive and require frequent replacement increasing labor and costs
Solution Approach 1:
The patent employs a molded cutter made of polyurethane or similar durable but replaceable material. While not as hard as steel, this material provides sufficient cutting consistency for pipe splitting and can be replaced more easily and cheaply than hardened steel components, improving overall productivity by reducing replacement time and cost.
Solution Approach 2:
The pipe splitter uses composite construction with a polyurethane cutter head mounted on a support structure. This composite approach combines the cutting effectiveness of durable materials with the structural support needed, achieving consistent cutting while allowing for more economical replacement compared to fully hardened steel constructions.
Data Source
AI summary
A pipe splitting assembly includes a pipe splitter, for instance, a cutter with one or more blades. An expander is flexibly coupled with the pipe splitter and allows the pipe splitter to rotate out of alignment with the longitudinal axis of the expander. In one example, the pipe splitter includes a cylindrical base portion and a frusto-conical base portion proximal to the cyclindrical base portion, and an exterior surface of the frusto-conical base portion is flush with an exterior surface of the expander. In another example, the expander has a larger outer perimeter than the cutter. Optionally, the pipe splitting assembly further includes a puller shoulder sized and shaped to couple with the expander, and a puller sleeve adapted to receive and hold a replacement pipe.