Multipoint Lock Panic Override via Transmission Ring
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Solution Overview
Problem
Conventional multipoint locks with panic functions often malfunction when using key cylinders without a lost-motion function or 90° key cylinders, leading to potential blockages and unreliable indication of the lock's state during panic operations.
Innovation Solution
The locking pawl is operatively connected with the actuating lug of the key cylinder via a transmission element, ensuring the actuating lug is moved out of blocking positions during panic operations, and a retaining device holds the transmission ring in predetermined positions to prevent blockages, allowing reliable panic unlocking even with 90° key cylinders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a DIN key cylinder without lost-motion function is used, then the lock structure is simplified, but the actuating lug may remain in an undefined position causing panic actuation to be blocked
Solution Approach 1:
A transmission element (transmission ring with teeth) is introduced as an intermediary between the actuating lug and the locking pawl. This transmission ring ensures that the actuating lug is always moved to a defined position when the locking pawl is actuated, preventing the undefined position problem while maintaining the simplified DIN cylinder structure without lost-motion function.
2Loss of information
If a 90° key cylinder is used, then the indicator function is improved, but the limited rotational axis disrupts the panic function and blocking positions cannot be reliably indicated
Solution Approach 1:
The transmission ring acts as a mediator that decouples the limited rotation of the 90° cylinder from the requirements of the panic function. It ensures that the actuating lug is properly positioned regardless of the cylinder's rotational limits, allowing the 90° cylinder to provide reliable indication while the panic function remains operational.
Solution Approach 2:
The transmission ring changes the effective rotational parameter of the actuating mechanism. While the cylinder itself is limited to 90°, the transmission ring with its tooth engagement ensures that the actuating lug undergoes the necessary rotational movement to properly engage or disengage the locking pawl, effectively changing the operational parameter from cylinder rotation to lug positioning.
3Device complexity
If the locking pawl is directly actuated by the actuating lug, then the mechanism is simplified, but blockages occur during panic operations when the lug remains in blocking positions
Solution Approach 1:
The transmission ring with teeth serves as an intermediary mechanism between the actuating lug and the locking pawl. During panic operations, this transmission element ensures that the actuating lug is systematically moved through defined positions, preventing blockages and ensuring smooth operation of the locking pawl without requiring complex additional components.
Data Source
AI summary
A latch has a housing and a dead bolt shiftable on the housing between extended and retracted positions. A latch nut is rotatable on the housing and connectable to door handles and carries actuating and panic levers. An actuating element is connected between the dead bolt and the actuating lever, and a panic element is connected between the panic lever and a locking pawl and is movable between an unactuated position and an actuated position to shift the locking pawl into an unlocked position. A key cylinder on the housing has a movable actuating lug movable between a locking end positing and a freeing end position. A pivotal locking pawl is shiftable by movement the actuating lug of the key cylinder into a locked position blocking movement of the actuating element and holding the dead bolt in the extended position and an unlocked position freeing the bolt and actuating element.