Plastic Door Frame Reinforcement Plate for Screw Retention
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Solution Overview
Problem
Door leaves with U-shaped reinforcement profiles lack a sufficient counter-bearing for screws at the door hinge connection, which can lead to instability and require additional steel profiles for support, complicating assembly and design.
Innovation Solution
A reinforcement plate is inserted between the profile legs of the U-shaped reinforcement profile, providing an additional counter-bearing for screws and allowing for a flush termination of the profile, connected via self-tapping screws to the plastic profile frame and door hinge, with optional features like bulges and a Euro-groove for enhanced stability and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a U-shaped reinforcement profile is used in the hollow chamber of the plastic profile frame, then the structural strength is improved, but the counter-bearing for fastening screws at the door hinge connection is insufficient
Solution Approach 1:
A reinforcement plate is introduced as an intermediary element between the U-shaped reinforcement profile and the door hinge. This plate provides the necessary counter-bearing surface for fastening screws, mediating the connection between the reinforcement structure and the hinge mechanism without compromising the structural integrity provided by the U-shaped profile.
Solution Approach 2:
The reinforcement system is segmented into two functional components: the U-shaped reinforcement profile for structural strength and the separate reinforcement plate for screw retention. This segmentation allows each component to optimize its specific function while working together as an integrated system.
2Reliability
If additional steel profiles are added to provide counter-bearing for screws, then the screw retention is improved, but the device complexity increases
Solution Approach 1:
The counter-bearing function is extracted from the complex multi-profile steel structure and consolidated into a single reinforcement plate element. This extraction simplifies the overall device by removing the need for additional steel profiles while maintaining the necessary screw retention capability.
Solution Approach 2:
The reinforcement plate serves multiple functions: providing counter-bearing for screws, maintaining structural integrity, and enabling flush termination of the profile. This multi-functionality reduces the need for separate components, thereby simplifying the overall device complexity.
3Shape
If the reinforcement profile is terminated flush at its end faces, then the aesthetic appearance is improved, but the assembly complexity increases due to corner welded connectors
Solution Approach 1:
The reinforcement plate is designed with pre-formed features such as bulges and Euro-grooves that facilitate its insertion and positioning before final assembly. This preliminary preparation of the plate geometry simplifies the subsequent assembly process despite the requirement for flush termination.
Data Source
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AI summary
The invention relates to a door leaf (10) with a plastic profile frame (11) in which at least one hollow chamber (12) is formed, in which a U-shaped reinforcing profile (13) is arranged, the latter having at least two profile legs (14, 15) and a profile base (16). The plastic profile frame (11) has at least one lateral profile area (17) to which a door hinge (19) and/or at least one drive component, such as a hardware mechanism or a rod lock, can be attached. On the side of the hollow chamber (12) facing the lateral profile area (17), at least one reinforcing plate (23) is arranged in the reinforcing profile (13) between the profile legs (14, 15).