Fenestration Cladding Assembly with Deformable Attachment
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Solution Overview
Problem
Conventional fenestration products face challenges with thermal conductivity, as metal facias lead to heat loss, and assembly issues due to misalignment of frames, resulting in unreliable attachments and poor energy efficiency.
Innovation Solution
A cladding assembly system using a low thermal conductivity core (PVC-U) with a high thermal conductivity cladding (aluminium) and deformable attachment formations, including elongate ridges and latch projections, to ensure secure and energy-efficient attachment, and a hinge assembly method with retention pegs and fixing wedges for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal facia is used to improve durability and aesthetic appeal, then the durability and appearance are improved, but thermal conductivity increases causing heat loss
Solution Approach 1:
The fenestration product uses a composite structure combining a metal facia (aluminium) for durability and appearance with a PVC-U core for thermal insulation. This composite construction allows the product to simultaneously achieve mechanical strength from the metal and thermal insulation from the plastic core, resolving the contradiction between durability and heat loss.
2Ease of manufacture
If clip formations are used to attach the metal facia to the core, then the assembly is simplified, but the attachment reliability becomes problematic
Solution Approach 1:
The attachment mechanism uses deformable pip elements that change their physical state during assembly. The pips are designed to deform under compression force during installation, creating a reliable mechanical interlock between the facia and core. This parameter change from rigid to deformed state ensures secure attachment while maintaining ease of assembly.
3Strength
If frames are assembled using bolts or screws to attach hinges, then the connection is strong, but misalignment prevents tight closure
Solution Approach 1:
The hinge assembly method uses retention pegs and fixing wedges to pre-align the frames before final bolting. The retention pegs insert into aligned holes to temporarily secure the hinge position, and fixing wedges ensure the frames are tightly aligned. This preliminary alignment action prevents misalignment issues that would occur with direct bolting, ensuring both connection strength and manufacturing precision.
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
The system provides improved thermal insulation, secure attachment, and precise assembly, reducing energy loss and enhancing durability and aesthetic appeal of fenestration products.
Implementation Method 1
the projection of the first attachment formation comprises a deformable pip element which is configured to deform when a biasing force in excess of a predetermined level is exerted on the pip element
Implementation Method 2
metal has a high thermal conductivity which allows heat to be conducted easily through the profile of the fenestration product and lost to the surrounding environment
Implementation Method 3
A metal facia is usually attached to the core to improve the outward appearance and durability of the product
Data Source
Figure 1
Figure 2
Figure 3~7
AI summary
A cladding assembly for a fenestration product comprises a core element (2) and a cladding element (7,8), a first attachment formation comprising a projection (15), a second attachment formation comprising at least one engagement surface (22-24) that at least partly surrounds an open ended recess(25). The recess (25) has an enlarged portion and a narrowed portion. The projection (15) is configured to be at least partly received in the recess (25) to releasably or permanently attach the first attachment formation to the second attachment formation. The core element (2) carries one of the attachment formations and the cladding element (7, 8) carries the other attachment formation such that the cladding element (7, 8) can be releasably or permanently attached to the core element (2) by the first and second attachment formations.