Elevator Brake Coupling Device for Overspeed Control
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Solution Overview
Problem
The existing elevator brake release systems can lead to dangerous situations due to elevated elevator car velocities during manual release, potentially trapping passengers and requiring specialized technicians to release the gripping device.
Innovation Solution
A coupling device controlled by the overspeed governor is introduced between the brake release lever and the brake, which disconnects the brake release lever from the brake when the car velocity exceeds a predetermined limit, preventing the activation of the gripping device and ensuring safe passenger release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brake release lever is used to manually release the operating brake, then trapped passengers can be freed, but the elevator car velocity may become too high leading to dangerous situations
Solution Approach 1:
A coupling device is introduced as an intermediary between the brake release lever and the operating brake. This coupling device can be selectively engaged or disengaged to control the mechanical connection, allowing the brake release function to be activated only when the coupling device is in the engaged state, thereby preventing uncontrolled velocity increases
Solution Approach 2:
The coupling device is designed to be dynamically controllable, transitioning between engaged and disengaged states based on operational conditions. This dynamic control ensures that the brake release lever only affects the operating brake when appropriate safety conditions are met, resolving the contradiction between ease of operation and velocity control reliability
2Reliability
If the coupling device is actuated to disconnect the brake release lever from the brake during overspeed, then velocity control is improved, but the gripping device may be activated requiring specialized technicians
Solution Approach 1:
The overspeed governor is configured with a specific threshold setting that triggers the coupling device disconnection at a velocity level below what would activate the gripping device. By carefully selecting this parameter threshold, the system achieves velocity control while avoiding the activation of complex gripping mechanisms that would require specialized intervention
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 allows for secure release of passengers by controlling elevator car velocity during manual brake release, reducing the risk of overspeed and eliminating the need for specialized technicians to release the gripping device, thereby enhancing safety and operational simplicity.
Implementation Method 1
The operating brake comprises an electromagnet which keeps the brake shoe open when energized
Implementation Method 2
a brake shoe of the operating brake is configured to brake the rotor or the traction sheave of a drive machine of the elevator upon the force of a spring means
Implementation Method 3
an overspeed governor which is usually built by two pulleys located in the top and bottom of the elevator shaft which are connected by an endless rope
Implementation Method 4
a brake shoe of the operating brake is configured to brake the rotor or the traction sheave of a drive machine of the elevator
Data Source
AI summary
The invention relates to an arrangement for releasing the operating brake of an elevator in an emergency situation and for driving an elevator car of the elevator to a floor level, comprising at least one electric operating brake of the elevator as well as a brake release lever, which brake release lever is connected with the brake via a mechanical transmission means, which arrangement further comprises an overspeed governor connected with a gripping device of the elevator car. According to the invention in between the brake release lever and the brake a coupling device is arranged, which coupling device is controlled by the overspeed governor. Via this means the car velocity is controlled also during release of trapped passengers.