Prefabricated Shower Bench Alignment for Leak-Safe Tiled Installation
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Solution Overview
Problem
Existing prefabricated shower modules face issues with uneven cooling during manufacturing, leading to bowing and warping, which affects the pitch and water-tightness of the shower floor, and limited design options due to the need for specific molds for each size, resulting in increased costs and installation challenges.
Innovation Solution
The use of polyurethane reaction injection molding with support ribs and a contoured drain wall design to ensure even cooling and integration of a modular curb system that allows for customizable installation, reducing manufacturing time and increasing design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If prefabricated shower modules are manufactured using conventional molding processes, then production speed increases, but uneven cooling causes bowing and warping that affects floor pitch and water-tightness
Solution Approach 1:
The patent changes the physical parameters of the molding process by implementing a multi-cavity mold system with controlled cooling channels. The mold divides the shower module into multiple cavities that can be independently cooled, allowing precise control of cooling rates to prevent differential shrinkage and warping while maintaining high production throughput through simultaneous multi-unit manufacturing.
Solution Approach 2:
The patent segments the shower module manufacturing into multiple independent cavities within a single mold system. Each cavity can be independently controlled and cooled, allowing the large-scale production benefits of multi-cavity molding while preventing the warping issues that would affect the entire module. The segmented approach also allows for modular assembly of the shower unit.
2Manufacturing precision
If specific molds are used for each shower module size, then manufacturing precision is maintained, but device complexity and production costs increase
Solution Approach 1:
The patent creates a universal mold system that can produce multiple shower module sizes and configurations through the use of inserts and adjustable cavity configurations. The base mold structure remains the same, but interchangeable inserts allow customization of cavity shapes and sizes, enabling a single mold to serve multiple product variants while maintaining precise dimensional control.
Solution Approach 2:
The patent implements dynamic mold configurations where cavity inserts can be added, removed, or repositioned based on production requirements. This allows the mold system to adapt to different product specifications without requiring completely different tooling, reducing the overall complexity of maintaining multiple specialized molds while preserving manufacturing precision for each variant.
3Reliability
If thicker mortar layers are used to form the shower floor, then water-tightness improves, but curing time increases beyond 24 hours
Solution Approach 1:
The patent performs preliminary waterproofing actions during the molding process itself by integrating drainage channels and waterproof membranes into the shower module structure before installation. The multi-cavity mold system incorporates drainage pathways and sealing features that are formed during manufacturing, eliminating the need for thick post-installation mortar layers and extending curing times.
Solution Approach 2:
The patent replaces the traditional mechanical mortar-based waterproofing system with an integrated molded drainage and sealing system. The shower module includes built-in drainage channels, sumps, and waterproof barriers that are formed as part of the plastic molding process, providing equivalent or superior water-tightness without requiring thick mortar applications and extended curing periods.
4Ease of operation
If conventional liner installation methods are used, then ease of operation is maintained, but the liner is susceptible to punctures and leaks
Solution Approach 1:
The patent uses composite material construction for the shower module, combining rigid structural plastics with integrated waterproof membranes and flexible drainage components. The multi-layer composite structure provides puncture and leak resistance while maintaining installation simplicity, as the entire assembled unit is installed as a single piece rather than requiring separate liner installation.
Solution Approach 2:
The patent merges the liner, drainage system, and structural components into a single integrated molded unit. The waterproofing features, drainage channels, and structural elements are combined into one piece that is manufactured as a complete assembly, eliminating the separate liner installation step and its associated risks of punctures and leaks while maintaining ease of installation.
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
This approach minimizes warping and bowing, ensures proper drainage and water-tightness, and expands design options for shower modules, reducing production costs and installation time while maintaining leak-proof integrity.
Implementation Method 1
After filling the mold with the resin, the module must cool (e.g., solidify) before being removed
Implementation Method 2
the module must cool (e.g., solidify) before being removed
Data Source
AI summary
A prefabricated shower bench for installation in a tiled shower includes a seating member defining at least one peripheral edge, and at least one sidewall depending downwardly therefrom. The sidewall has an upper edge and a lower edge. The upper edge is connected along a corresponding peripheral edge of the seating member. The lower edge terminates at a height above the ground which is the same as or slightly greater than the height of a corresponding sidewall of a prefabricated shower module. The upper surface is horizontal or pitched slightly downward toward the shower module when the shower bench is installed adjacent to the sidewall of the shower module. The lower edge of the downwardly depending sidewall is situated substantially in registry with an upper edge of the prefabricated shower module sidewall. The prefabricated shower module sidewall is in a plane that is substantially contiguous with a plane formed by the downwardly depending sidewall of the bench. The combination provides a contiguous surface over which finishing material such as shower tile may be installed.