Elevator Ceiling Access Panel Cable Release for Tall Cars
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Solution Overview
Problem
Elevator maintenance access panels are difficult to operate due to their size and location, especially in taller cars, posing safety and convenience challenges for technicians.
Innovation Solution
A ceiling access panel system with a drum sheave and locking pins operated by a cable mechanism, allowing remote release and deployment of a working platform from within the elevator car, facilitated by guide sheaves and biasing elements to ensure easy access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a manual ceiling access panel is used in tall elevator cars, then the panel can be securely locked, but it becomes difficult for technicians to access and operate
Solution Approach 1:
A cable mechanism acts as an intermediary between the drum sheave (operated at accessible height) and the locking pins (located at the ceiling panel). The cable transmits the unlocking force remotely, allowing technicians to operate the system from a convenient position while maintaining secure locking at the ceiling panel.
Solution Approach 2:
The system transforms the operational dimension from vertical (requiring technicians to reach up to the ceiling) to horizontal (operating the drum sheave at accessible panel height). The cable mechanism enables force transmission across different spatial dimensions, allowing remote operation of the ceiling panel locks.
2Adaptability or versatility
If the ceiling access panel is located at the top of the elevator car, then maintenance access to exterior components is enabled, but technicians require additional tools and equipment to reach it
Solution Approach 1:
The cable mechanism serves as an intermediary that transmits mechanical force from the drum sheave to the locking pins, eliminating the need for technicians to carry ladders or other access equipment. The system provides self-contained remote operation capability within the elevator car.
Solution Approach 2:
The elevator car's own structure and components (drum sheave, cable, locking pins) work together to provide the access function. The system uses the existing mechanical infrastructure to enable technicians to open the ceiling panel without external tools, making the system self-sufficient for its intended purpose.
3Reliability
If locking pins are used to secure the ceiling access panel, then the panel remains securely closed, but the locking mechanism becomes complex
Solution Approach 1:
The locking function is segmented into discrete locking pins that can be individually actuated by the cable mechanism. Each locking pin operates independently to secure the ceiling panel, allowing the complex locking function to be broken down into simple, manageable components that are easily controlled by the cable-pulley system.
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
Enables safe and convenient access to the elevator car top without additional tools, suitable for cars taller than 2.3 m, enhancing maintenance efficiency and safety.
Implementation Method 1
rotation of the drum sheave causes the at least one cable to wind about the drum sheave and cause retraction of the at least one locking pin from engagement with the ceiling access panel
Implementation Method 2
at least one biasing element arranged to bias the at least one locking pin into engagement with the ceiling access panel
Data Source
Figure 1
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AI summary
An elevator car includes an elevator car floor, a plurality of side walls, and a ceiling defining an interior of the elevator car. A ceiling panel access system includes a drum sheave arranged within one of the side walls, at least one locking pin arranged on a top of the elevator car and configured to releasably engage with a ceiling access panel to lock the ceiling access panel in a locked state and disengage therefrom to cause the ceiling access panel to open into the interior of the elevator car, and at least one cable operably connecting the drum sheave to the at least one locking pin, wherein rotation of the drum sheave causes the at least one cable to wind about the drum sheave and cause retraction of the at least one locking pin from engagement with the ceiling access panel.