Cistern Maintenance Window and Modular Frame Design

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Solution Overview

Problem

Existing cistern systems are difficult to install, adjust, and maintain, particularly due to complex designs that obscure important components, making it hard to access and service them.

Innovation Solution

The cistern system incorporates a removable upper frame bar for easy fluid connection, adjustable frame height, a quick connect system for fluid connections, and a compact integrated flush valve assembly that can be installed and serviced without tools through a maintenance window.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the cistern is designed with hidden components for aesthetic purposes, then the appearance is improved, but the ease of maintenance and adjustment deteriorates

Engineering Contradiction:
Improveaesthetic appearanceVSAvoidmaintenance accessibility
Core Design Contradiction:
ShapeVSEase of repair

Solution Approach 1:

The cistern is divided into separate functional modules (flush valve assembly, fill valve assembly, siphon assembly) that can be independently accessed and maintained through the maintenance window, while the overall structure remains aesthetically pleasing with hidden components

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

A maintenance window acts as an intermediary access point that allows technicians to service internal components without exposing them during normal operation, thus maintaining aesthetics while enabling maintenance

Inventive Principle:
Principle #24Intermediary (Mediator)

2Shape

If the cistern components are concealed for aesthetic purposes, then the appearance is improved, but the ease of installation deteriorates

Engineering Contradiction:
Improveaesthetic appearanceVSAvoidinstallation ease
Core Design Contradiction:
ShapeVSEase of manufacture

Solution Approach 1:

The cistern system is segmented into modular assemblies that can be pre-assembled and tested separately, then installed as complete units through the maintenance window, simplifying the installation process while maintaining aesthetic concealment

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

Components are pre-assembled and pre-configured outside the cistern housing, allowing for easier installation of the complete assembly unit without requiring complex in-situ assembly operations

Inventive Principle:
Principle #10Preliminary action

3Device complexity

If a compact integrated flush valve assembly is used, then the device complexity is reduced, but the manufacturing precision requirements increase

Engineering Contradiction:
Improveassembly complexityVSAvoidintegration precision
Core Design Contradiction:
Device complexityVSManufacturing precision

Solution Approach 1:

The flush valve assembly integrates multiple functions (flush control, fill control, siphon activation) into a single compact unit with common mounting mechanisms and fluid pathways, reducing the number of separate components while maintaining functional independence through precise internal design

Inventive Principle:
Principle #5Merging (Combining)

Data Source

PatentUS20250146260A1Cistern system, apparatus and method
Publication Date: 2025.05.08 FLUIDMASTER INC
  • US20250146260A1 patent drawing
  • US20250146260A1 patent drawing
  • US20250146260A1 patent drawing

AI summary

The disclosure is directed to a cistern system which enables maintenance, removal, or adjustment of various components through a maintenance window according to some embodiments. In some embodiments, the cistern system includes screen support members that cooperate with a flush valve to remove fallen components. In some embodiments, the cistern system includes a frame with an adjustable upper bar that can be removed to facilitate the installation of various components. In some embodiments, the frame includes a bar holder fastener that enables vertical leveling when the frame is secured to a wall with one or more wall mounts. In some embodiments, the frame includes adjustable frame supports that can be fixed in position by frame height adjusters when only supporting the weight of the cistern system but can be adjusted in and out of the frame by adding additional downward force to the frame.