Composite Door Section Bar with Insulating Synthetic Interlayer
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Solution Overview
Problem
Existing methods for manufacturing mixed material section bars for doors, windows, and shutters face challenges such as premature deterioration due to unabsorbed material expansions, inadequate acoustic and thermal insulation, poor load-bearing capacity, and difficulties in connecting long elements, leading to costly and complex assembly processes.
Innovation Solution
A composite section bar assembly comprising a metal section bar with an undercut seat and perpendicular wing, a synthetic section bar with equidistant slots for dimensional stability and air chambers, and a shaped wooden element, connected using a cylindrical device with eccentric heads and a cam shape for simultaneous engagement and stress distribution, allowing for efficient absorption of thermal expansions and mechanical stress transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wooden elements are placed in direct contact with metal sections, then assembly is simple, but the wooden elements suffer premature deterioration due to unabsorbed thermal expansions
Solution Approach 1:
A synthetic intermediate element is introduced between the wooden element and metal section. This synthetic element has thermal expansion properties that match the wood, acting as a mediator that absorbs differential thermal expansions and prevents direct stress transmission from the metal to the wood, thereby preventing premature deterioration while maintaining assembly simplicity
Solution Approach 2:
The section bar employs a composite structure combining metal, synthetic material, and wood. Each material is strategically positioned to leverage its properties: metal for structural strength, synthetic material for thermal expansion compatibility with wood, and wood for aesthetic and insulating functions. This composite approach resolves the contradiction by allowing simple assembly while protecting the wooden elements
2Device complexity
If the wooden part alone provides acoustic and thermal insulation, then the structure is simple, but the insulation performance is insufficient without a damping barrier
Solution Approach 1:
The synthetic intermediate element serves dual functions: it acts as a damping barrier between the metal and wood, and simultaneously provides enhanced acoustic and thermal insulation. This intermediary structure improves insulation performance without significantly increasing overall complexity, as it integrates into the existing composite structure
3Device complexity
If the wooden part alone holds the glass, then the structure is simple, but the glass holding capability is insufficient due to poor intrinsic resistance of small wooden sections
Solution Approach 1:
The synthetic intermediate element acts as a mediator that shares the load-bearing function for glass support. It provides additional structural reinforcement at the glass-holding location, distributing stresses away from the vulnerable wooden sections while maintaining the overall simple structure where the wood still performs its primary function of holding the glass
4Strength
If key dowels are used to connect metal and wooden elements, then the connection is secure, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The synthetic intermediate element is designed to be integrally connected to both the metal section and wooden element, merging multiple connection functions into a single unified component. This eliminates the need for separate key dowels and their complex insertion procedures, achieving secure connection while dramatically simplifying and accelerating the assembly process
5Strength
If pressure coupling elements are used to connect the entire length, then the connection is strong, but the glass holding is worsened due to additional fractures introduced in the coupling
Solution Approach 1:
The connection system is segmented into discrete localized connection points rather than continuous pressure coupling along the entire length. The synthetic intermediate element provides localized reinforcement at critical stress points, maintaining connection strength while avoiding the creation of multiple fracture planes that would compromise glass holding stability
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 solution effectively isolates wooden elements from metal sections, enhances acoustic and thermal performance, and allows for a single rotation assembly that securely holds glass, transferring mechanical stresses to the metal core, thus improving durability and assembly efficiency while reducing the load on weaker components.
Implementation Method 1
a second element, also of the section bar type, made of synthetic material (12), provided with through slots (13) in a position that is, for example, equidistant along its length, that is shaped so as to have longitudinal ribs (14) and grooves (14'), that are useful for keeping the dimensional stability and for creating air chambers for improving the acoustic and thermal performances
Implementation Method 2
longitudinal ribs (14) and grooves (14'), that are useful for keeping the dimensional stability and for creating air chambers for improving the acoustic and thermal performances
Implementation Method 3
creating air chambers for improving the acoustic and thermal performances
Data Source
AI summary
The present invention concerns a section bar for closure such as doors, windows and shutters obtained by connecting three different elements in which the first (7) is a metal section bar, the second (12) is a spacing insulation section bar provided with slots (13) and finally the third (16) in wood, and such a connection being obtained through a device (18) provided with three suitable eccentric appendages (20, 20' and 20") as well as a figure with a thickness and the shape of a cam (21). A process for assembling the section bar for closure such as doors, windows and shutters consisting of approaching the second insulating element (12) with the first metal element (7), positioning the glass (11) against the special wing (10), passing the slots (13) with the devices (18) positioning the former on the latter, approaching the third wooden element (16), finally locking the device (18) so as to obtain the simultaneous locking of the three different elements (7, 12, and 16) as well as simultaneously keeping the sheet of glass (11) in its seat.