Tilt-before-turn Espagnolette Fitting with Segmented Limiting Arm
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tilt-in-front drift fittings for windows struggle to maintain the wing in a tilting position under high-acting forces and often experience instability and unwanted friction, particularly in applications like high-rise buildings and schools where windows are not fully openable and must withstand forced opening attempts.
Innovation Solution
The design features a boundary arm with two sections connected via storage, allowing the sections to fold or extend between locking and tilting positions, ensuring the wing remains in the tilting position and incorporating adjustable storage axles, safety elements, and a blocking device to prevent accidental opening, with a fixing device for enhanced stability and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-section limiting arm is used, then the structure is simple, but the stability under high forces is insufficient
Solution Approach 1:
The limiting arm is divided into two separate sections that can pivot relative to each other. This segmentation allows the arm to extend into a stable triangular configuration when forces are applied, providing structural strength while maintaining operational simplicity through the pivot connection between sections.
2Reliability
If the limiting arm sections are extended to hold the sash in tilt position, then the stability under high forces is improved, but the device complexity increases
Solution Approach 1:
The limiting arm sections are designed to pivot dynamically between a retracted position (when not in use) and an extended position (when holding the sash in tilt). This dynamic configuration allows the system to maintain reliability when needed while minimizing structural complexity during normal operation.
3Stability of the object's composition
If the bearing axes are made immovable in the holders, then the stability is improved, but the adaptability for adjusting tilt range is reduced
Solution Approach 1:
The holder assembly is segmented into a fixed portion and an adjustable portion. The bearing axes are made immovable relative to the fixed holder to ensure stability, while the adjustable portion allows for modifying the tilt range by repositioning the bearing axes, thus achieving both stability and adaptability.
4Ease of operation
If coupling means are made manually releasable, then the ease of operation is improved, but the reliability against accidental decoupling is reduced
Solution Approach 1:
The coupling means incorporate a preliminary locking mechanism that prevents accidental decoupling before it can occur. The manually releasable feature allows intentional disconnection through a deliberate action, while the preliminary anti-action (locking element) blocks unintended separation, thus achieving both ease of operation and reliability.
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 design effectively keeps the wing in the tilting position under high forces, allows easy operation, and provides enhanced stability and security against accidental opening, ensuring the window remains securely locked in the intended position.
Implementation Method 1
Cam guides regularly lead to an impairment of the stability of the interconnected components and to undesirable friction.
Data Source
Figure 1~2
Figure 3~4
AI summary
A tilt-before-rotate connecting rod fitting (3) has a tilt limiting device (10) arranged on a vertical post (9) with a limiting arm (15) connecting two brackets (13, 14). The limiting arm (15) has two sections (16, 17) pivotally connected to each other via a bearing (18) and pivotable bearings (19, 20) on the brackets (13, 14). This allows the tilting position of the connecting rod fitting (3) to withstand high forces.