Mortise Lock Controllable Coupling Device for Tamper Resistance
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Solution Overview
Problem
Conventional mortise locks lack enhanced security against tampering, as they can be opened by manipulating the lock cylinder, such as through lockpicking, and do not integrate well with electromechanical systems without requiring extensive wiring or replacement of existing locking systems.
Innovation Solution
A mortise lock design featuring a controllable coupling device within the force transmission device that enables or disables power transmission between the lock cylinder and the locking element based on authorized access, using a transponder for authentication, allowing the lock cylinder to actuate the locking element only when access is authorized, and incorporating a self-contained energy store for power independence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional mortise lock with a lock cylinder is used, then the lock can be operated with a mechanical key, but the lock can be opened by manipulating the lock cylinder (e.g., lockpicking)
Solution Approach 1:
A controllable coupling device is introduced as an intermediary between the lock cylinder and the locking element. This coupling device includes a coupling element that can be selectively engaged or disengaged, preventing direct force transmission from the lock cylinder to the locking element when unauthorized access is attempted. The intermediary blocks manipulative forces while allowing authorized operation.
Solution Approach 2:
The coupling device is designed to dynamically change its state between engaged and disengaged positions. When authorized access is detected (e.g., via electronic authorization), the coupling element engages to transmit force from the lock cylinder to the locking element. When unauthorized, the coupling element remains disengaged, isolating the locking element from manipulation attempts on the lock cylinder.
2Reliability
If electromechanical locking systems are integrated into conventional mortise locks, then security against lockpicking is improved, but extensive wiring and replacement of existing locking systems are required
Solution Approach 1:
The locking system is segmented into independent functional modules: the existing lock cylinder assembly, the new controllable coupling device with authorization checking capability, and the locking element. This modular segmentation allows the authorization-based coupling mechanism to be added as a separate unit without replacing the entire locking system or requiring extensive wiring changes to existing infrastructure.
Solution Approach 2:
The coupling device is designed with multi-functionality to work with both traditional mechanical key operation and electronic authorization systems. It can detect and respond to different types of access authorization inputs while controlling the same mechanical coupling mechanism, making it universally applicable to various door and access control scenarios without requiring system-specific customization.
3Reliability
If the coupling device is designed to prevent unauthorized access, then security is enhanced, but the device complexity increases
Solution Approach 1:
The authorization checking function is extracted as a separate, self-contained control mechanism within the coupling device. The coupling element and its actuation mechanism are designed as distinct components that can independently perform the authorization verification and coupling engagement/disengagement functions, simplifying the overall design by separating the control logic from the mechanical force transmission path.
Data Source
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AI summary
A mortise lock (10) for a door, comprising a lock housing (12), a locking cylinder (14) arranged on the lock housing (12), and a locking element (16) guided on the lock housing (12) and movable between an extended (18) and a retracted position (20), and a force transmission device (22) between the locking cylinder (14) and the locking element (16) for retracting the locking element (16) by means of the locking cylinder (14), is designed and further developed with simple structural means to increase tamper resistance, such that the force transmission device (22) is assigned a controllable coupling device (26) for generating a force transmission between the locking cylinder (14) and the locking element (16) in the event of authorized access.