Elevator Pit Safety System with Integrated Control Logic
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Solution Overview
Problem
Existing elevator pit safety systems are ineffective due to user error or negligence, as they often require manual activation of emergency-stop switches and lighting, which can be overlooked, especially in routine maintenance tasks, leading to potential crushing hazards.
Innovation Solution
An integrated elevator pit safety system that includes a control system connected to an emergency stop switch, power switch, lighting system, and override buttons, which automatically activates the stopping component and lighting when the emergency stop switch or power switch is engaged, ensuring safe operation by preventing cab movement and providing illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual activation of emergency-stop switches and lighting is required, then system complexity is reduced, but safety reliability deteriorates due to user error or negligence
Solution Approach 1:
The patent combines the emergency-stop switch activation and lighting activation into a single integrated safety system. When the emergency stop switch is engaged, both the stopping component and the lighting system are automatically activated through a control system, ensuring that safety measures are consistently applied without requiring separate manual actions.
Solution Approach 2:
The system performs preliminary safety actions by automatically activating both the stopping component and lighting when the emergency stop switch is engaged, before any potential hazard can occur. This ensures that safety measures are in place before a person enters the pit or before dangerous motion can occur.
2Reliability
If automatic activation of stopping component and lighting is implemented, then safety reliability improves, but device complexity increases due to additional control system components
Solution Approach 1:
The control system serves multiple functions: it receives signals from the emergency stop switch, activates the stopping component, and simultaneously activates the lighting system. This multi-functionality consolidates what would otherwise be separate systems into a single integrated control unit, managing complexity while enhancing reliability.
Solution Approach 2:
The safety system is self-activating through the control system that automatically responds to the emergency stop switch engagement. The system serves itself by automatically coordinating the activation of multiple safety components without requiring additional manual intervention or complex external control mechanisms.
3Ease of operation
If emergency stop switch and lighting are independent, then ease of operation improves, but safety reliability deteriorates as lights may be turned on without activating emergency-stop
Solution Approach 1:
The patent merges the control of the emergency stop switch and the lighting system into a single integrated operation. Both functions are controlled through the same safety switch mechanism, ensuring that when safety mode is activated, both the stopping component and lighting are simultaneously engaged, eliminating the risk of one being activated without the other.
4Adaptability or versatility
If multiple safety activation methods are provided, then adaptability improves, but ease of operation deteriorates due to increased user decisions required
Solution Approach 1:
The emergency stop switch is designed as a universal control that simultaneously performs multiple safety functions: activating the stopping component and activating the lighting system. This single switch provides adaptability for different safety needs while maintaining ease of operation by requiring only one simple action from the user.
Data Source
AI summary
An elevator pit safety system is provided, along with methods of use thereof. An elevator pit safety system may include a control system, an emergency stop switch, and a power switch. The emergency stop switch may be configured to stop an elevator cab. The power switch may be configured to operate a lighting system. The control system may prevent either from being used without the other. The elevator pit safety system may be configured to allow overriding the safety features.