Insulation Dowel Sleeve with Plastic Shortening for Compact Packaging
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Solution Overview
Problem
Existing methods for fastening insulating materials with dowels result in large pack sizes due to telescopic expansion, leading to inefficiencies in logistics, storage, and transport.
Innovation Solution
A dowel with a screw as an expanding element, a dowel sleeve featuring a tapered channel for expansion, and a holding plate that is axially fixed and rotatable, allowing for plastic shortening of the shank section when anchored, eliminating the need for telescopic sliding and enabling compact packaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a telescopic dowel design is used to enable expansion during installation, then the fastening function is achieved, but the packaging size becomes very large
Solution Approach 1:
The dowel is divided into separate components: a dowel sleeve and a retaining plate that can be packaged separately and assembled on-site. This segmentation allows compact packaging while maintaining the telescopic expansion function during installation.
Solution Approach 2:
Instead of packaging the dowel in its expanded telescopic form, the invention inverts the approach by packaging it in a compact disassembled state and performing the expansion transformation during on-site installation.
2Ease of operation
If the retaining plate is made rotatable relative to the dowel sleeve, then the installation process is simplified, but the structural complexity increases
Solution Approach 1:
The retaining plate is designed with rotational freedom relative to the dowel sleeve, transforming it from a static component to a dynamic one. This allows the retaining plate to rotate during installation to align with the insulating material while maintaining structural simplicity through the use of a plain bearing.
3Force
If the channel in the expansion section is tapered, then the expansion force is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The channel in the expansion section is designed with a tapered geometry, changing the cross-sectional parameters along the length of the channel. This gradual parameter change enables controlled expansion of the dowel sleeve while distributing the manufacturing tolerance requirements across the entire tapered surface rather than concentrating them at specific locations.
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 solution allows for compact packaging and easy assembly on-site, reducing logistics challenges while ensuring secure fastening of insulating materials to substrates with minimal torque and preventing water penetration.
Implementation Method 1
The channel in the expansion section is tapered relative to the shaft section such that the expansion section is expanded by driving in the screw, thereby enabling the dowel to be anchored in a borehole in a substrate
Implementation Method 2
the anchor sleeve features a shortening zone in the shaft section. This shortening zone can be shortened by tightening the screw when anchoring the anchor in the substrate, and is plastically compressible
Implementation Method 3
the screw is turned first, followed by the screw and retaining plate together. As the retaining plate rotates, it cuts into the insulation material
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The invention relates to a dowel (1) and a setting method for fastening insulating materials (25). The dowel (1) has a screw (13), a dowel sleeve (2) and a retaining plate (8). In order to create a retractable dowel that can be delivered in a compact form, the invention proposes that the retaining plate (8) be connected to the dowel sleeve (2) in an axially fixed and rotatable manner and that the dowel sleeve (2) have a shortening zone (22) in the shank section (4). , such that it can be plastically compressed by tightening the screw (13) when anchoring the dowel (1) in a substrate (26).