Mechanical Closure Control for Double-Leaf Doors With Cable Tensioning
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Solution Overview
Problem
Existing devices for mechanical closing sequence control in double-leaf doors face complexity in cable tensioning and adjustment, requiring multiple steps and reliance on installer intuition, with potential for suboptimal settings and stress on the cable due to pulley deflection.
Innovation Solution
The cable tensioning device is arranged on the barrier, allowing for direct adjustment with the door leaves closed, featuring a winding mechanism with a cable drum and visual indicator for precise tensioning, eliminating the need for manual adjustment and pulley deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cable tension is adjusted using known devices with the passive leaf open, then the adjustment can be made, but multiple adjustment steps are required and the process is complex
Solution Approach 1:
The cable tensioning device is pre-assembled and integrated into the lock mechanism before installation, with the cable already routed through the pulley system. This preliminary preparation eliminates the need for complex on-site adjustment procedures, allowing installers to simply operate the manual reel to tension the cable after installation.
Solution Approach 2:
The device includes a manual reel mechanism that allows the installer to independently adjust cable tension without requiring specialized tools or complex procedures. The self-contained design enables the system to serve its own adjustment needs through simple manual operation, reducing dependency on external adjustment mechanisms.
2Adaptability or versatility
If the cable is guided around a pulley for length adjustment, then cable length can be adjusted, but the cable is flexed during each closing cycle and subjected to stress
Solution Approach 1:
The pulley is designed to rotate freely during door operation, dynamically adapting to the cable tension changes that occur during closing cycles. This rotational movement allows the cable to maintain a consistent routing path without sharp bends or flexing, reducing stress while preserving adjustability through the manual reel mechanism.
Solution Approach 2:
The pulley acts as an intermediary element between the cable and the door mechanism, transferring the cable tension force while maintaining a smooth bending radius. This intermediate component protects the cable from direct contact with sharp edges or rigid structures that would cause stress concentration and reduce durability.
3Ease of manufacture
If the cable tension is adjusted by hand after cutting to length, then initial tension can be established, but the adjustment is based on installer intuition and may not be optimal
Solution Approach 1:
The device incorporates a visual indicator mechanism that provides real-time feedback on cable tension status during adjustment. As the manual reel is operated, the indicator shows when the cable reaches the optimal tension level, eliminating the need for installer intuition and ensuring precise, repeatable settings across different installations.
Solution Approach 2:
The manual reel mechanism replaces intuitive hand-adjustment with a controlled mechanical winding system. This substitution provides measurable, incremental tension adjustment through defined rotational movements, replacing subjective installer judgment with objective mechanical control for more precise tension setting.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A device (20) for mechanically controlling the closing sequence of a double-leaf door (1) having a moving leaf (2) and a fixed leaf (3), wherein the moving leaf (2) and the fixed leaf (3) each have a door drive (7, 8), and wherein each door drive (7, 8) is connected via a linkage (9, 12) to a respective slider (10, 13) arranged in a slide rail (11, 14), has a lock (22) which interacts with the slider (10) of the moving leaf (2), a trigger (24) for deactivating the lock (22), which interacts with the slider (13) of the fixed leaf (3), wherein the lock (22) is operatively connected to the trigger (24) via a cable (26), and a cable tensioning device (30) for tensioning the cable (26). The cable tensioning device (30) is arranged on the barrier (22) and/or the cable tensioning device (30) is designed to wind up an end section of the cable (26).