Elevator Door Blocking Assembly Mechanism
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Solution Overview
Problem
Elevator door safety systems fail to prevent accidental or unauthorized opening, posing risks to users, especially when the elevator car is absent or in motion, leading to potential falls and hazards from rapid displacement.
Innovation Solution
A blocking assembly for elevator doors that includes a translation guide, leaf carriage, and latch mechanism, which moves between a blocking and release configuration to prevent forced opening, ensuring the door remains closed unless properly aligned with landing doors, utilizing motor means and counterweight or elastic return mechanisms to maintain safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional door safety systems are used, then the elevator can operate with basic door functions, but the doors can be accidentally or unauthorizedly opened when the car is absent or in motion, creating safety hazards
Solution Approach 1:
The blocking assembly is activated in advance when the elevator car is absent or in motion, preventing the door from being opened before the hazardous condition occurs. The system proactively engages the blocking mechanism rather than reacting after an attempt to open the door, thereby eliminating the safety hazard before it can manifest.
Solution Approach 2:
The blocking assembly acts as an intermediary mechanical element between the door and the door frame, introducing a physical barrier that prevents direct opening. This intermediary component transfers the safety function from the control system to a mechanical constraint, adding a layer of passive safety that operates independently of electronic control systems.
2Reliability
If a blocking assembly is added to prevent unauthorized opening, then door safety is enhanced, but the device complexity increases
Solution Approach 1:
The blocking assembly is divided into separate functional components: a blocking element that physically prevents door opening, a detection system that monitors car position and motion, and a control mechanism that activates the blocking function. This segmentation allows each component to be optimized independently and simplifies maintenance and replacement.
Solution Approach 2:
The blocking assembly is designed to activate automatically based on signals from the elevator control system, eliminating the need for manual intervention. The system self-regulates by detecting hazardous conditions and engaging the blocking mechanism without requiring operator action, thereby reducing operational complexity while maintaining safety.
Data Source
AI summary
A blocking assembly for a leaf of an elevator door includes a translation guide, a first leaf carriage mounted slidably to the translation guide between a first position and a second position, a latch connected to the translation guide and rotatable between a blocking configuration of the first leaf carriage in an intermediate position wherein the latch intercepts and blocks the carriage against the guide, and a configuration for releasing the carriage wherein the carriage is free to slide to the second position, latch return in the blocking configuration, and first coupling connected to the first leaf carriage and to the latch. When the carriage is in the first position, the first coupling is coupled together to keep the latch in the release configuration, in contrast to the action of the return. When the carriage is in the intermediate position, the first coupling is uncoupled so that the latch is moved by the return into the blocking configuration.