Espagnolette Bolt Segmentation for Break-in Resistance
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Solution Overview
Problem
Existing outwardly opening window or door assemblies with slim frame and sash construction face challenges in achieving sufficient strength against break-in due to limited space for striking plates, compromising the ventilation position's security.
Innovation Solution
The espagnolette bolt is split into two end bolts that engage separate recesses on the corner striking plate, with a flexible band and actuation arm mechanism allowing smooth operation and enhanced strength, even in constrained spaces, and a corner striking plate design that splits forces between frame members for increased security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single espagnolette bolt is used to engage the corner striking plate, then the device complexity is reduced, but the strength against break-in is insufficient
Solution Approach 1:
The espagnolette bolt is segmented into two separate end bolts (first end bolt and second end bolt) that engage with separate recesses in the corner striking plate. This segmentation distributes the engagement forces across multiple contact points, significantly improving the strength against break-in attempts while maintaining a relatively simple overall device structure
2Shape
If the frame and sash construction is made slim, then the aesthetic appearance and modern design are improved, but the space available for the striking plate is limited
Solution Approach 1:
The corner striking plate utilizes the three-dimensional corner space of the frame by extending recesses along the corner edge. This dimensional utilization allows the striking plate to engage bolts from multiple directions, providing secure engagement in slim constructions where traditional flat-mounted striking plates would be insufficient
3Strength
If a separate cover bracket is added to reinforce the end bolts, then the strength against break-in is improved, but the device complexity increases
Solution Approach 1:
The separate cover bracket is designed to merge with the existing frame structure, utilizing the frame's material and geometry to provide reinforcement. The cover bracket integrates the reinforcement function with the aesthetic covering function, strengthening the end bolts while maintaining a clean appearance without adding excessive complexity
4Strength
If the espagnolette bolt is split into two end bolts, then the engagement strength is improved, but the ease of operation may be affected
Solution Approach 1:
The single espagnolette bolt mechanism is designed to simultaneously control both the first end bolt and the second end bolt through a unified actuation system. This multi-functional design allows the user to operate both engagement points with a single action, maintaining ease of operation while achieving enhanced engagement strength through dual-bolt configuration
Data Source
Figure 1A~1B
Figure 2~5
Figure 6
AI summary
The window (1) comprises a sash (3) carrying a window pane (4) being mounted movably in a frame (2). A locking device (7) comprises at least one displaceable locking element in the form of an espagnolette bolt (8a, 8b) and a handle (13) adapted to displace the locking element between a locked position and an unlocked position. An engagement portion of the espagnolette bolt is split up into a first and a second end bolt (17, 18), so that, in a closed position, the first end bolt (17) may engage a first recess (15) of a corner striking plate (10), and the second end bolt (18) may engage a second recess (16) of the corner striking plate, and so that, in a ventilation position, the second end bolt may engage the first recess (15) of the corner striking plate.