Blocking Device for Double-Leaf Door Closing Sequence Control
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Solution Overview
Problem
Existing slide rail door closers for double-leaf swing doors require large driver fingers to maintain the active leaf in a wide open position when the passive leaf is opened, leading to unattractive and potentially damaging configurations, especially during the closing sequence of fire protection doors.
Innovation Solution
A blocking device that connects the sliding block of the active leaf to a locking rod, which is blocked from moving towards the axis of rotation of the active leaf when the fixed leaf is open, using a locking mechanism with clamping plates and release levers to control the opening angle of the active leaf, allowing it to be held in a smaller waiting position until the fixed leaf is closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active leaf is held in a wide open position using existing slide rail door closers, then the closing sequence control works properly, but large driver fingers are required which are unattractive and potentially damaging
Solution Approach 1:
Instead of allowing the active leaf to move freely and using large driver fingers to force it into position, the invention inverts the approach by using a blocking device that prevents the locking rod from moving unless the active leaf is in the correct waiting position. This reverses the control logic from active forcing to passive blocking, eliminating the need for large driver fingers
Solution Approach 2:
The invention introduces a locking rod as an intermediary element between the active leaf and the closing sequence control mechanism. This locking rod, controlled by the blocking device with clamping plates, mediates the relationship between door position and closing sequence activation, allowing precise control without requiring large mechanical driver fingers
2Reliability
If the active leaf is forced into a wide opening movement, then the closing sequence can be controlled, but high torques damage parts
Solution Approach 1:
The invention inverts the force application approach by instead of forcing the active leaf into position (applying high torque), the blocking device allows the leaf to remain in a smaller waiting position and only permits movement when properly positioned. This eliminates the need for high torque forcing actions that damage components
Solution Approach 2:
The invention changes the positional parameter of the active leaf from requiring a wide open position to accepting a smaller waiting position. By modifying the angular position parameter at which the blocking device engages, the system achieves closing sequence control without subjecting door components to damaging high torques
3Length of moving object
If a blocking device is introduced to control the active leaf position, then driver finger size is reduced, but device complexity increases
Solution Approach 1:
The blocking device is segmented into distinct functional components: a locking rod connected to the sliding block, clamping plates for blocking movement, and release levers for disengagement. This segmentation allows each component to perform its specific function efficiently, reducing overall complexity compared to a monolithic blocking mechanism while achieving the goal of smaller driver fingers
Solution Approach 2:
The blocking device incorporates self-service features where the clamping plates automatically engage to block the locking rod when the active leaf is in the waiting position, and the release levers automatically disengage the clamping when the fixed leaf closes. This self-actuating mechanism reduces complexity by eliminating the need for external control systems or complex actuation mechanisms
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 solution reduces the minimum opening angle of the active leaf required when the passive leaf is opened, allowing for a more compact and safer operation of double-leaf swing doors, particularly in fire protection scenarios, by preventing abrupt stopping and reducing torque on door components.
Implementation Method 1
two clamping plate holders 11 are pressed apart by a compression spring 21 arranged between them and thus, in the absence of other forces, each against an end stop of the Linear guide on the base part 10 are pressed
Implementation Method 2
the clamping plates are each pivoted by a compression spring 13 out of the normal plane in the direction of the locking bar so that the edges of their opening touch the outer surface of the locking bar come to grips with pressure
Implementation Method 3
the edges of their opening touch the outer surface of the locking bar come to grips with pressure. Due to this concern, the locking rod 20 and the clamping plates are clamped against relative movement
Data Source
Figure 1
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Figure 3
AI summary
The device has a gear wing and an active wing that are arranged in preset manner. A slide ring is arranged in parallel with respect to a sliding rail for holding a gear wing in a wait state. The movement of a blockable bar (20) is blocked by opening the gear wing. The blockable bar is moved along sliding rail supported on a locking element (12). The blockable bar is aligned closer to the pivot axis of an active wing.