Elevator Door Lock Anti-Vandalism Mechanism
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Solution Overview
Problem
Existing elevator landing door locks are vulnerable to malicious actions, such as unauthorized access to the emergency control mechanism and external operating arm, which can lead to accidents and vandalism by simulating the arrival of a cabin to unlock the door.
Innovation Solution
A positive security lock design that incorporates a sliding bolt with an angularly operable connecting rod, an external maneuvering arm, and temporary locking means for the connecting rod head, preventing malicious unlocking actions through the emergency key or direct external arm manipulation, utilizing an electromagnet for secure rotation locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the emergency control mechanism and external operating arm are accessible for authorized operation, then the lock can be unlocked when needed, but malicious persons can also access and manipulate these components to cause unauthorized unlocking
Solution Approach 1:
The lock mechanism is divided into separate functional components: the emergency control mechanism with triangle key access, the external operating arm for cabin-actuated unlocking, and the newly added anti-vandalism device. This segmentation allows authorized functions to remain accessible while isolating vulnerable components from malicious manipulation.
Solution Approach 2:
The anti-vandalism device acts as an intermediary between the external operating arm/connecting rod and the bolt mechanism. It selectively blocks or permits transmission of mechanical forces based on whether they originate from authorized (cabin actuation) or unauthorized (vandalism) sources, thereby protecting the system while maintaining legitimate functionality.
2Ease of operation
If the connecting rod is freely movable to allow unlocking operations, then the lock can respond to cabin arrival signals, but it becomes vulnerable to mechanical manipulation and vandalism
Solution Approach 1:
The anti-vandalism device dynamically changes the mechanical constraints on the connecting rod based on operational conditions. During legitimate unlocking (when the bolt is retracted), the device permits free movement of the connecting rod. During locking operations or when subjected to excessive force, the device activates to block manipulation, thereby adapting its behavior to the operational context.
3Strength
If the lock provides strong locking force to secure the door, then safety is improved, but the lock becomes more resistant to legitimate emergency unlocking operations
Solution Approach 1:
The anti-vandalism device applies a preliminary blocking action to prevent excessive or malicious forces from being transmitted to the bolt mechanism. This preliminary protection allows the lock to maintain strong locking force during normal operation while preventing the accumulation of forces that could compromise the locking mechanism or enable unauthorized unlocking.
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 lock ensures secure locking of the elevator cabin when not in use, preventing unauthorized access and vandalism by maintaining the locking function, thus enhancing user safety and preventing accidents.
Implementation Method 1
one or more electric bolt contacts and an electromagnet arranged to cooperate with the bolt to exert a permanent thrust on the latter
Data Source
Figure 1~2C
Figure 3~4
Figure 5~7B
AI summary
The lock (1) has an adjustable bolt (6) mounted slidingly in a case (5), and cooperating with a locking part. A rod (15) is integrated to a rotating axle (16) that traverses the case, and is connected with the bolt for displacing the bolt between locking and unlocking positions with respect to a landing door. A locking unit (21) temporarily locks a head (17) of the rod by direct action on the head for displacing the bolt to the locking position.