Cavity Wall Box Retaining Tab Eliminates Countersink
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Solution Overview
Problem
Existing electrical installation systems for cavity walls require additional preparation and assembly effort due to the need for ring-shaped countersinks, which increase installation complexity and cost.
Innovation Solution
A cavity wall box with a tubular body and a retaining tab that limits penetration depth, eliminating the need for a ring-shaped rim and countersink, combined with a mounting frame that includes recesses and fastening receptacles for secure and flush mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a ring-shaped rim with countersink is used to prevent over-insertion, then the cavity wall box can be positioned correctly, but additional installation preparation and complexity are required
Solution Approach 1:
The single ring-shaped rim is segmented into multiple discrete retaining tabs distributed around the circumference of the base body. Each tab independently limits insertion depth and provides positioning, eliminating the need for a continuous rim and associated countersink preparation.
Solution Approach 2:
The countersink feature is extracted and eliminated from the design. The retaining tabs achieve positioning accuracy without requiring the wall opening to have a countersink, thereby removing this preparatory step and reducing installation complexity.
2Shape
If a ring-shaped rim is used to ensure flush mounting, then proper surface alignment is achieved, but additional installation effort is required
Solution Approach 1:
The continuous ring-shaped rim is divided into discrete retaining tabs, which simplifies both the box structure and the installation process while maintaining the ability to achieve flush mounting with the wall surface.
Solution Approach 2:
Instead of requiring the wall opening to have a countersink to accommodate a rim (traditional approach), the design inverts the approach by having retaining tabs that extend from the base body to provide the stopping and positioning function without requiring any special preparation of the wall opening.
3Device complexity
If a retaining tab design is used instead of a ring-shaped rim, then installation complexity is reduced, but secure attachment to the wall must be maintained
Solution Approach 1:
The segmented retaining tabs provide both insertion depth limitation and positioning functionality, while the mounting frame with its fastening elements distributed around the circumference ensures secure attachment to the base body, maintaining reliability despite the simplified structure.
Solution Approach 2:
The functions of depth limitation, positioning, and attachment are merged into an integrated system where the retaining tabs work in conjunction with the mounting frame and fastening elements, achieving both simplified installation and secure, reliable mounting.
Data Source
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AI summary
The electrical installation system according to the invention comprises a cavity wall box (10) and a mounting frame (20). The cavity wall box (10) has a tubular base body (11) for receiving an electrical installation insert, for example, a switch, a push button, a socket, or the like, and can be inserted into an opening (2) formed in a cavity wall (1). The tubular base body (11) is closed at its first end by a bottom wall (12) and has a retaining tab (13) formed radially outwardly on the base body (11) at its second end. Furthermore, the base body (11) has two mounting receptacles (14) arranged opposite each other around its circumference. For this purpose, the mounting frame (20) has first openings (24) for the passage of a fastening element (30) in each case, which interacts with one of the mounting receptacles (14) to fasten the mounting frame (20) to the cavity wall box (10).Furthermore, the mounting frame (20) has a recess (23) for receiving the retaining tab (13), such that the mounting frame (20) lies flush on a surface of the hollow wall (1). In this way, the installation effort can be significantly reduced.