Elevator Counterweight Handover Test Device
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Solution Overview
Problem
The existing methods for performing a handover test on an elevator counterweight are complex, require the use of a jack and ladder, and are not cost-effective, as they necessitate the supply of these tools for safety code compliance.
Innovation Solution
A mechanical actuator is introduced to move the safety actuation mechanism of the counterweight between normal and safety positions, allowing for direct testing of safety brake functionality without the need for a jack or ladder, using a screw mechanism or other actuators that apply a force to the safety actuation mechanism, thereby simulating the slack condition and engaging the safety brakes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a jack and ladder are used to perform the handover test, then the safety brake functionality can be tested, but the device complexity and cost increase
Solution Approach 1:
The invention extracts the essential testing function from the complex jack-and-ladder setup. By using a simple mechanical actuator to directly move the safety actuation mechanism between normal and safety positions, the patent isolates and tests only the critical safety brake functionality without requiring the full external equipment setup.
Solution Approach 2:
The mechanical actuator is integrated into the counterweight assembly itself, allowing the system to test its own safety brakes using internal components. The actuator can be manually operated by maintenance personnel to simulate the slack condition and engage the safety brakes, enabling self-testing without external equipment.
2Reliability
If a jack and ladder are used to perform the handover test, then the safety brake functionality can be tested, but the ease of operation deteriorates
Solution Approach 1:
The mechanical actuator is integrated into the counterweight assembly itself, allowing the system to test its own safety brakes using internal components. The actuator can be manually operated by maintenance personnel to simulate the slack condition and engage the safety brakes, enabling self-testing without external equipment.
Solution Approach 2:
The invention extracts the essential testing function from the complex jack-and-ladder setup. By using a simple mechanical actuator to directly move the safety actuation mechanism between normal and safety positions, the patent isolates and tests only the critical safety brake functionality without requiring the full external equipment setup.
3Reliability
If a jack and ladder are supplied for each unit, then the safety code compliance is achieved, but the loss of substance increases
Solution Approach 1:
The mechanical actuator serves multiple functions: it can be used for handover testing, routine maintenance testing, and verification of safety brake functionality. This single component replaces the need to supply separate jack and ladder equipment for each unit, reducing overall material consumption while maintaining compliance.
Solution Approach 2:
The mechanical actuator is integrated into the counterweight assembly itself, allowing the system to test its own safety brakes using internal components. The actuator can be manually operated by maintenance personnel to simulate the slack condition and engage the safety brakes, enabling self-testing without external equipment.
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 simplifies and safeties the handover test process, eliminating the need for a jack and ladder, reducing costs, and enabling maintenance personnel to test safety brake functionality efficiently and safely from within the elevator car, improving both efficiency and safety.
Implementation Method 1
a mechanical actuator, configured, when actuated, to apply a force to the safety actuation mechanism and thereby move the safety actuation mechanism from the normal position to the safety position
Implementation Method 2
in the safety position the safety actuation mechanism is arranged to actuate the at least one safety brake and thereby brake the counterweight structure
Data Source
AI summary
An elevator counterweight assembly (11) includes a counterweight structure (38), at least one safety brake (12a, 12b) mounted on the counterweight structure (38), and a safety actuation mechanism (16) including a connection (17) for a suspension member (18). The safety actuation mechanism (16) is configured to move, relative to the counterweight structure (38), between a normal position, and a safety position. In the safety position the safety actuation mechanism (16) is arranged to actuate the at least one safety brake (12a, 12b) and thereby brake the counterweight structure (38). The counterweight assembly (11) also includes a mechanical actuator (22), configured, when actuated, to apply a force to the safety actuation mechanism (16) and thereby move the safety actuation mechanism (16) from the normal position to the safety position, e.g. for the purposes of a handover test.