Door Fitting with Displaceable Mandrel for Thermal Decoupling
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Solution Overview
Problem
Existing door and window locking systems, particularly those for heat-insulated sash and window frame profiles, lack reliable security solutions without compromising thermal decoupling.
Innovation Solution
A corner bracket guide with a longitudinally displaceable locking mandrel, designed to be centrally positioned and symmetrical, featuring a groove for a sealing profile and a screw connection, ensures secure locking without affecting thermal insulation, using materials like plastic for the fitting and steel for the locking mandrel to absorb shear forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking mechanism is installed on thermally insulated sash and frame profiles, then security is improved, but thermal decoupling is compromised
Solution Approach 1:
The locking system is divided into separate functional components: a fitting with locking mandrel for security function, and thermal break elements that maintain thermal isolation. The fitting is positioned centrally where it can provide security without creating a thermal bridge through the insulated profile structure.
Solution Approach 2:
A fitting designed as an angle with central positioning acts as an intermediary element that provides locking function while maintaining thermal decoupling. The fitting can be made of plastic or other materials that do not create significant thermal bridges, mediating between the security requirement and thermal insulation requirement.
2Loss of energy
If a locking mechanism is positioned centrally on the sash, then thermal decoupling is maintained, but installation complexity increases
Solution Approach 1:
The fitting is designed as an essentially symmetrical angle piece that can be installed in any orientation without distinction between left- or right-hand mounting. This universal design simplifies installation despite central positioning, as the same component works in all orientations and locations.
3Ease of operation
If the fitting is made symmetrical for universal installation, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
While the overall fitting shape is symmetrical for universal installation, asymmetric features such as grooves for sealing profiles and specific fastening locations are provided on appropriate legs. This allows the fitting to maintain installation flexibility while accommodating manufacturing tolerances through functional asymmetry in non-critical areas.
Data Source
Figure 1
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Figure 3
AI summary
The fitting (1) has a longitudinal leg (5) and a cross arm (4). A recess (8) is extended over the entire length of longitudinal leg. A mandrel (9) is mounted longitudinally displaceable in the recess. A sealing profile (7) is inserted into side edges of fitting grooves (6) formed around the corner of the longitudinal leg and cross arm.