Flared End Section Assembly With Folding Hinges for Uniform Wall Thickness
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Solution Overview
Problem
Traditional flared end sections (FES) face issues with structural thinning due to thermoforming, leading to increased material costs, inefficient stacking, and displacement during shipping, along with structural weaknesses and the need for additional connectors, which are prone to breakage and displacement under soil pressure.
Innovation Solution
A flared end section assembly with a folding hinge and built-in coupling system, featuring a tapered midsection and folding hinge arms that allow for reduced plastic stretching during manufacturing, enabling vertical stacking, improved structural reinforcement, and efficient attachment to pipes without additional connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular shape is formed from a flat sheet of plastic during thermoforming, then the flared end section can be manufactured, but the wall thickness thins excessively (over 200% thinning from top to bottom)
Solution Approach 1:
The circular section is divided into two separate C-shaped halves that are formed independently and then joined together. This segmentation allows each half to be formed with controlled thickness, avoiding the excessive thinning that occurs when forming a complete circle from a single flat sheet. The injection molding process forms each C-shaped half as a separate component with more uniform wall thickness distribution.
Solution Approach 2:
Two separately formed C-shaped halves are merged together to create the complete circular section. This combining approach allows each half to be manufactured with optimal thickness control, and the joint between halves provides structural reinforcement rather than being a weak point. The merging of two controlled-thickness components results in a final product with better overall thickness uniformity than forming a complete circle in one step.
2Ease of manufacture
If the flared end section has a circular shape with wide base, then it can connect to pipe, but stacking efficiency is poor and shipping costs increase due to large displacement
Solution Approach 1:
The flared end section is designed with a collapsible structure where the C-shaped halves can fold inward along hinge lines. This dynamic capability allows the section to transition from its expanded circular configuration (for pipe connection) to a compressed folded configuration (for stacking). The hinges enable controlled folding that maintains structural integrity while reducing the vertical displacement required for stacking, thereby improving stacking efficiency and reducing shipping costs.
3Ease of manufacture
If traditional thermoforming is used to manufacture flared end sections, then production is simple, but structural reinforcements like ribs or stiffeners cannot be added without creating undercuts that are difficult to remove from molds
Solution Approach 1:
The manufacturing process is substituted from thermoforming to injection molding. Injection molding allows direct formation of complex three-dimensional structures including ribs, stiffeners, and other reinforcement features without requiring mold undercuts. The C-shaped halves are formed with these structural elements integrated into the mold cavity, eliminating the need for complex mold design and part removal operations. This mechanical process substitution enables both manufacturing efficiency and structural versatility.
4Ease of manufacture
If plastic threaded rods are used to connect flared end sections to pipes, then attachment is possible, but the connectors are prone to breakage and take additional time to install
Solution Approach 1:
The connection features are merged directly into the flared end section structure itself. The C-shaped halves incorporate integrated attachment features such as lugs, tabs, or direct bearing surfaces that are formed as part of the injection molding process. This eliminates the need for separate plastic threaded rod connectors, thereby improving reliability by removing the weak connector interface and reducing installation time by eliminating the bolting operation. The structural integration ensures that the connection is as strong as the flared end section itself.
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 assembly reduces material costs, enhances stacking efficiency, minimizes hydraulic losses, and provides structural integrity, allowing for thinner plastic usage and faster production cycles while maintaining strength under soil loads.
Implementation Method 1
first and second folding hinge arms hingedly coupled to the tapered midsection
Implementation Method 2
the first and second folding hinge arms define first and second arced surfaces, the first and second hinge arms having an open position and a closed position, wherein in the closed position, the first and second arced surface align with the partially circular portion to define a portion of a circle greater than the partially circular portion
Data Source
AI summary
A FES assembly for use with a drainage pip is described herein. The FES assembly includes an inlet head wall portion, a tapered midsection coupled to the flared end portion, the tapered midsection extending from the inlet head wall portion to a flared end section. The inlet head wall portion defining a base wall spacing and coupling first and second lateral walls, a partially circular portion defined by the first and second lateral walls, and a coupling base portion extending along the base wall. First and second folding hinge arms are hingedly coupled to the first and second lateral walls, wherein the first and second folding hinge arms define first and second arced surfaces. The first and second hinge arms extend between an open position and a closed position, wherein in the closed position, the first and second arced surface align with the partially circular portion to define a portion of a circle greater than the partially circular portion.