Elevator Safety Control Using Multi-System Door Switches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional elevator safety systems require additional equipment to detect movement of maintenance workers into the hoistway, increasing costs.
Innovation Solution
An elevator safety controlling apparatus that utilizes existing car gate switches and landing door switches to detect movement of maintenance workers by monitoring the open or closed state of car and landing doors, enabling automatic operation disabling when necessary, thereby reducing the need for extra equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional equipment is installed to detect movement of maintenance workers into the hoistway, then detection reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent makes existing door switches serve dual purposes: their primary function of detecting door open/closed states for normal operation, and a secondary function of detecting maintenance worker entry into the hoistway. By monitoring the state sequence of car door switch and landing door switches, the system can identify when maintenance workers enter the hoistway without requiring additional detection equipment, thus resolving the contradiction between detection reliability and device complexity
Solution Approach 2:
The system uses its own existing sensing capabilities (door switches) to detect conditions that would normally require separate detection equipment. The door switches 'serve themselves' by providing information about both door status and maintenance worker presence, eliminating the need for external detection devices and reducing overall system complexity while maintaining reliability
2Reliability
If additional equipment is installed to detect movement of maintenance workers into the hoistway, then detection reliability is improved, but cost increases
Solution Approach 1:
The patent makes existing door switches serve dual purposes: their primary function of detecting door open/closed states for normal operation, and a secondary function of detecting maintenance worker entry into the hoistway. By monitoring the state sequence of car door switch and landing door switches, the system can identify when maintenance workers enter the hoistway without requiring additional detection equipment, thus resolving the contradiction between detection reliability and device complexity
Solution Approach 2:
The system uses its own existing sensing capabilities (door switches) to detect conditions that would normally require separate detection equipment. The door switches 'serve themselves' by providing information about both door status and maintenance worker presence, eliminating the need for external detection devices and reducing overall system complexity while maintaining reliability
Data Source
Figure 1
Figure 2
Figure 3
AI summary
In an elevator safety controlling apparatus, a plurality of landing door switches are divided into a plurality of systems. A safety controlling portion can recognize opening of landing doors independently for each of the systems of the landing door switches. The safety controlling portion detects movement of maintenance workers into a hoistway if the landing door switches of any of the systems indicate an open door state when the car gate switch indicates a closed door state, and if the landing door switches in two or more of the systems indicate an open door state when the car gate switch indicates an open door state.