Elevator Car Access Door and Telescoping Mechanism for Hoistway Maintenance
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Solution Overview
Problem
Elevator system maintenance requires technicians to enter the hoistway for inspection and repair, which increases safety volume and space requirements, conflicting with customer demands for a compact system.
Innovation Solution
The elevator system incorporates an access door and telescoping mechanism in the car to allow for maintenance of components from inside, reducing the need for technicians to enter the hoistway, with sensors triggering door opening and automatic component retraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If technicians enter the hoistway for maintenance and inspection, then they can directly access components for repair, but the safety volume and clearance requirements increase the overall system volume
Solution Approach 1:
Instead of having technicians enter the hoistway to access components, the invention inverts the approach by bringing the components to the technician. The telescoping mechanism extends components through the car ceiling toward the technician inside the car, allowing maintenance without entering the hoistway, thus reducing required safety volume while maintaining accessibility
Solution Approach 2:
The invention employs a telescoping mechanism that dynamically adjusts the position of components. The mechanism can extend components outward through the car ceiling during maintenance operations and retract them during normal operation, providing adaptable access without permanently increasing system volume
2Reliability
If safety volume and clearance are increased for technician entry, then technician safety is improved, but the elevator system occupies larger overall volume
Solution Approach 1:
The invention extracts the maintenance function from the hoistway environment and relocates it to the car interior. By providing maintenance access through the car ceiling with telescoping components, the system removes technicians from the hazardous hoistway environment while maintaining safety, eliminating the need for increased safety volume in the hoistway
Solution Approach 2:
The telescoping mechanism serves as an intermediary between the car interior and the hoistway components. It allows safe transfer of components to the technician inside the car without requiring the technician to enter the hoistway, thus maintaining safety while avoiding volume increase
Data Source
Figure 1A
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AI summary
An elevator car for an elevator system includes one or more elevator car walls and an access door openable from inside the elevator car to provide access to one or more elevator system components located outside of the elevator car. The access door is openable such that inspection, maintenance and/or repair is performed on the one or more elevator system components from inside of the elevator car. An elevator system includes a hoistway and one or more elevator system components fixed in the hoistway. An elevator car is suspended in the hoistway and is drivable along the hoistway. The elevator car includes an access door openable from inside the elevator car to provide access to the one or more elevator system components in the hoistway, such that inspection, maintenance and/or repair is performed on the one or more elevator system components from inside of the elevator car.