Roller Shutter Box Twin-Wall Design for Rigidity and Drainage
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Solution Overview
Problem
Existing roller shutter boxes require multiple component variations and fixed service cover orientations, limiting cost efficiency, rigidity, and installation flexibility.
Innovation Solution
A rectangular prism box with separably joined plastic cellular walls, featuring a twin structure for opposite side walls, a shaped-profile slat with T-shaped guide and V-shaped catch, and hinges, allowing the box to open in two planes using the same components, enhancing rigidity and insulation while facilitating water drainage and easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional fixed service cover orientation is used, then manufacturing is simpler, but component variety increases and cost efficiency decreases
Solution Approach 1:
The recesses at the ends of walls perpendicular to each other have the same shape (trapezoidal cross-section), creating a symmetric design that allows identical components to be used for both left and right covers. This eliminates the need for different oriented components while maintaining manufacturing simplicity.
Solution Approach 2:
The shaped-profile slat with T-shaped guide and V-shaped catch can be joined interchangeably with either the cellular side wall or the cellular bottom wall. The same slat component serves multiple functions depending on its insertion orientation, reducing component variety while maintaining ease of manufacture.
2Adaptability or versatility
If multiple component variations are used for left and right covers, then installation flexibility is improved, but device complexity and production costs increase
Solution Approach 1:
By making the recesses symmetric (same trapezoidal shape at both ends), the design allows identical components to be installed in different orientations, providing installation flexibility without requiring different component variations for left and right covers.
Solution Approach 2:
The shaped-profile slat can be inserted in different orientations (interchangeably with side wall or bottom wall) to achieve the same functional result, effectively using the same component in inverted or alternative configurations to reduce overall device complexity.
3Strength
If cellular walls are used, then rigidity and insulation are improved, but manufacturing complexity increases
Solution Approach 1:
The box is constructed from separably joined cellular walls, dividing the structure into modular segments. This segmentation provides rigidity and insulation through the cellular structure while allowing simplified manufacturing and assembly of individual wall sections.
Solution Approach 2:
The shaped-profile slat combines multiple functions: it serves as a structural connector, provides a guide for assembly, and creates a water drainage path. By merging these functions into a single component, the design achieves structural complexity reduction while maintaining rigidity.
4Ease of operation
If skew bottom profile is used, then water drainage is improved, but manufacturing precision requirements increase
Solution Approach 1:
The skew bottom profile uses specific angle measurements (45° and 67.5°) to create an asymmetric trapezoidal shape that facilitates water drainage. These precise angular measurements are built into the mold design, allowing efficient drainage while maintaining manufacturability through standard molding processes.
Data Source
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AI summary
The subject of this invention is a box of an overlay-type roller shutter, furnished with a snap-lock enabling opening of one of two adjacent service covers. The box of an overlay-type roller shutter, of a rectangular prism form, constructed of separably joined plastic cellular walls (1), (2), (3), (4), two opposite side walls (1), (3) are of a twin structure. In the inner corner (5) of the said box there is a shaped-profile slot (6) separably joined with the side cellular wall (3) or with the bottom cellular wall (4), the slat (6) in its cross-section perpendicular to the lengthwise axis (7) has the shape of a near isosceles right-angle triangle, whereas at the side (9), there is a T-shaped guide (8) placed inside the recess (10), or inside the recess (10'), whereas at the other side (11), there is a catch (12) of a near V-shape, whereas in the upper parts of the walls (1), (3), there are hinges (13), (14) placed in the corners (15), (16) of the top cellular wall (2).