Polymeric Door Frame Mitred Joint Sealing
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Solution Overview
Problem
The existing process for manufacturing doors with polymeric profiles is hindered by the visibility of the inner space in the finished door and leakage of insulating liquid PU material due to the hollow nature of polymeric profiles, which is not compatible with the traditional assembly method used for wooden profiles.
Innovation Solution
The use of hollow polymeric profiles with mitred ends and a connection piece featuring a toothed part that fits into the adjacent profile, along with a groove and slot system, ensures the inner cavity is sealed, allowing for the injection and curing of liquid foam insulation without leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If hollow polymeric profiles are used to reduce weight and maintain structural rigidity, then weight is reduced and structural rigidity is maintained, but the inner space becomes visible in the finished door and liquid PU insulation material leaks through the open profile interior
Solution Approach 1:
The patent applies the nesting principle by inserting a connection piece with a toothed part into the hollow polymeric profile. The toothed part nests within the profile's inner space, creating a sealed compartment that prevents liquid PU insulation material from leaking through while maintaining the hollow profile's weight and structural advantages.
Solution Approach 2:
The connection piece acts as an intermediary element between the hollow polymeric profile and the frame assembly. It mediates the contradiction by providing internal sealing structures (toothed parts) that prevent leakage while allowing the hollow profile to maintain its weight-reducing benefits.
2Object-affected harmful factors
If hollow polymeric profiles are used instead of wooden profiles, then moisture resistance is improved and production costs are reduced, but the traditional assembly method fails due to leakage and visibility of inner space
Solution Approach 1:
The patent segments the connection function by introducing a separate connection piece with toothed parts that can be inserted into the hollow polymeric profile. This segmentation allows the polymeric profile to maintain its moisture-resistant properties while the connection piece provides the necessary sealing and structural integration with the frame assembly.
Solution Approach 2:
The patent employs composite construction by combining the polymeric profile material with the connection piece material (which may be different). This composite approach allows each material to contribute its superior properties - the polymeric profile provides moisture resistance and the connection piece provides sealing and structural compatibility with traditional assembly methods.
3Reliability
If the inner cavity is filled with liquid PU insulation material, then insulation performance is improved, but the material leaks through the open inner space of hollow polymeric profiles
Solution Approach 1:
The toothed part of the connection piece is nested within the hollow polymeric profile, creating an internal sealing structure. This nested configuration prevents liquid PU insulation material from escaping through the profile's inner space while allowing the insulation material to effectively fill the door's internal cavity.
Solution Approach 2:
The patent converts the potentially harmful open inner space of the hollow profile into a beneficial sealed compartment. The toothed part, which initially occupies internal space, is transformed into a sealing element that prevents insulation material loss while maintaining the profile's structural advantages.
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 enables the successful assembly and insulation of doors with polymeric profiles, enhancing moisture resistance and extending the door's lifespan while maintaining structural rigidity and reducing production costs.
Implementation Method 1
a connection piece (8) is provided between two adjacent profiles (2a, 2b) of the frame and comprises a body (20) having a cross section matching the inner space of a first profile (2a) and inserted therein, the body (20) having a mitred end surface (21) from which at least one toothed part (23) protrudes in a direction perpendicular to the longitudinal direction of the body (20), the toothed part (23) fitting in the inner space of an adjacent second profile (2b)
Implementation Method 2
Subsequently a hole is made in one of the profiles and a liquid PU-foam is inserted in the internal cavity to fill that cavity with a insulating material
Data Source
Figure 1~2
Figure 3a~3b
Figure 4a~4b
AI summary
A door or wall element comprising: • a frame comprising four elongated hollow profiles; • two side panels provided at opposed sides of the frame and attached to said frame; • at least two of the profiles positioned at opposed sides of the frame, provided with a groove situated at the sides of the concerned profiles defining the outer circumferential surface of the frame; • each of the side panels provided at opposed edges with a upstanding rim fitting into the concerned slot or groove of the frame; • comprising a connection piece provided between two adjacent profiles of the frame characterized in that the profiles are mitred and wherein the connection piece comprises a body having a cross section matching the inner space of a first profile and inserted therein, the body having a mitred end surface from which at least one toothed part protrudes in a direction perpendicular to the longitudinal direction of the body, the toothed part fitting in the inner space of an adjacent second profile.