Espagnolette Fitting Safety Device with Segmented Rocker
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Solution Overview
Problem
Existing mishandling devices for window and door fittings suffer from rocker damage and button deformation due to one-piece production, leading to reduced service life and increased structural complexity, along with potential misalignment issues and high manufacturing costs.
Innovation Solution
A rigid rocker with a bearing axis and a button featuring a run-up ramp, allowing for different orientations and separation from the blocking body, combined with a compact design and cost-effective die-casting production, ensures stability and easy assembly, while a spring element maintains the locking body in position and reduces structural dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the locking body and rocker are made in one piece, then the structural complexity is reduced, but the rocker can be damaged in the event of attempted movement of the blocked connecting rod
Solution Approach 1:
The invention separates the rocker from the locking body, making them distinct components. The rocker is designed as a separate lever that can pivot independently on a bearing axis, while the locking body remains as a separate blocking element. This segmentation allows the rocker to absorb operational forces without compromising the locking body, and enables easier replacement or maintenance of individual components.
2Adaptability or versatility
If the button is designed as elastically flexible material, then the button can deform to accommodate movement, but this leads to impairment of the service life of the mishandling device
Solution Approach 1:
The invention changes the material parameter of the button from elastically flexible material to rigid material. The rigid button maintains its shape and positioning characteristics over time, preventing the deformation issues that plague flexible buttons. The rigidity ensures consistent engagement with the rocker and maintaining force transmission without permanent deformation.
3Strength
If a direct bias of the locking body is used, then large structural dimensions are required, but the device becomes less compact
Solution Approach 1:
The invention introduces a spring element as an intermediary component that applies bias force to the locking body. Instead of requiring a large direct biasing mechanism, the spring element efficiently transmits the necessary force to keep the locking body in its blocking position. This intermediary approach achieves the required force with minimal structural dimensions.
4Ease of operation
If the rocker is designed as a band with hinge, then the hinge can be pivoted, but the precise guidance and shaping require particularly high structural effort
Solution Approach 1:
The invention extracts the pivoting function from the rocker itself and places it on a separate bearing axis. The rocker is designed as a simple rigid lever that rotates on a fixed bearing axis mounted in the bearing block. This separation simplifies the rocker geometry and eliminates the need for complex hinge mechanisms, while still providing the necessary rotational movement.
5Ease of manufacture
If the rocker and button are designed in one piece, then the manufacturing is simplified, but forces can act on the drive rod on the rocker leading to instability
Solution Approach 1:
The invention segments the force transmission path by separating the button from the rocker. The button serves as a separate actuating element that engages with the rocker but is not rigidly attached. This segmentation prevents forces from being transmitted to the drive rod through the rocker, maintaining stability while still allowing straightforward manufacturing of each individual component.
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 enhances the stability and service life of the mishandling device by preventing rocker deformation, maintaining precise positioning, and reducing assembly complexity, while being suitable for both right and left hinged wings and allowing for easy maintenance, with improved resistance to high forces and tolerances.
Implementation Method 1
so that the locking body is held in the first position, which engages in a form-fitting manner in the drive rod
Implementation Method 2
the button has a run-up ramp and that the button can be mounted on the rocker with different orientations of the run-up ramp
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The deficit switch interlock (11) has a longitudinally movable locking body (19) which is movable in a position blocking a connecting rod (6) and in another position releasing the movement of the connecting rod. A rocker switch (16) is designed rigidly with a key button (13). The rocker switch has a protruding guide (17) at an end.