Hollow Profile Door Hinge Fastening with Metal Reinforcement
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Solution Overview
Problem
Door hinges with spindle drives are subjected to higher radial loads, which can lead to overloading and potential damage of plastic profile chambers used in hollow chamber profiles, as these chambers are typically elastic and prone to destruction under excessive loads.
Innovation Solution
A fastening arrangement featuring a mounting screw and screw-in sleeve with an externally threaded section for the hollow chamber profile and an internally threaded section for the mounting screw, along with a dowel for enhanced stability, ensuring better force/load distribution and reducing the load on the plastic profile chamber. The screw-in sleeve and dowel combination allows for adjustable contact pressure and improved assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plastic profile clamp is used to attach a door hinge to a hollow chamber profile, then the hinge can be mounted on the profile, but the plastic profile chamber is subjected to increased stress and can be damaged by overloading
Solution Approach 1:
The patent introduces a metal reinforcement profile as an intermediary element between the plastic hollow chamber profile and the door hinge. This metal profile serves as a mediator that absorbs and distributes the radial loads from the hinge, preventing direct stress transmission to the elastic plastic chamber walls. The metal profile is inserted into the hollow chamber, providing a rigid mounting surface while the plastic profile maintains its structural enclosure function.
2Reliability
If the mounting screw penetrates through the hollow chamber profile directly, then the hinge can be fastened securely, but the load is concentrated on a small area of the plastic profile chamber causing potential damage
Solution Approach 1:
The patent segments the fastening function by separating the load-bearing function (performed by the metal reinforcement profile) from the structural enclosure function (performed by the plastic hollow chamber profile). The mounting screw penetrates only the metal reinforcement profile and the hinge mounting surface, not the plastic chamber walls directly. This segmentation distributes the mechanical stress to the rigid metal profile while the plastic profile maintains its structural integrity.
3Strength
If a heavier reinforcement profile is used to increase load bearing capacity, then the hinge attachment becomes more stable, but the design flexibility and aesthetic appearance of the profile is reduced
Solution Approach 1:
The patent applies local quality by adding the metal reinforcement profile only in the specific region where the door hinge is mounted, rather than reinforcing the entire hollow chamber profile. This localized reinforcement provides the necessary load-bearing capacity at the hinge attachment point while leaving the rest of the plastic profile lightweight and aesthetically pleasing. The metal profile can be selectively positioned and sized according to the specific loading requirements of different hinge applications.
Data Source
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AI summary
A fastening assembly is used to attach a door hinge (6) to a hollow chamber profile (1). The hollow chamber profile has at least one plastic profile chamber (2), which in turn has a reinforcing profile (3) with at least one reinforcing wall (4). The fastening assembly has at least one mounting screw (11) for attaching a door hinge part (7) to the hollow chamber profile (1). Furthermore, the fastening assembly has at least one screw-in sleeve (12) for holding the mounting screw (11). The screw-in sleeve (12) has an external threaded section (13) for screwing into the hollow chamber profile (1) and an internal threaded section (14) for screwing in the mounting screw (11). The mounting screw (11) has a length (LMS) which, in the installed state, is greater than the distance (AAW) between two consecutive reinforcing walls (4) of the reinforcing profile (3) along the longitudinal direction of the mounting screw (11).This results in a fastening arrangement that ensures good force/load distribution, so that, for a given profile geometry, the load on the plastic profile chamber is reduced.