Elevator Ceiling Access Panel With Cable-Driven Lock Release
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Solution Overview
Problem
Elevator maintenance requires access to ceiling components, which can be difficult due to the size and dimensions of the elevator car, posing safety concerns and necessitating additional equipment for technicians.
Innovation Solution
A ceiling access panel system with a drum sheave and locking pins operated by cables, allowing remote release and deployment of a working platform from within the elevator car, facilitated by a key-operated drum sheave mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual ceiling access panel is used in a traditional elevator car, then the structure remains simple, but access becomes difficult and unsafe for technicians in taller cars
Solution Approach 1:
The ceiling access panel is transformed from a static manual opening to a dynamic remotely-operated system. The panel can be opened and closed from the elevator car interior using a drum sheave and cable mechanism, allowing technicians to access the ceiling area without physically reaching through or climbing, thus improving ease of operation while maintaining structural simplicity
Solution Approach 2:
A drum sheave and cable system acts as an intermediary mechanism between the technician (inside the car) and the ceiling access panel. The cables transmit force from the drum sheave to the locking pins, enabling remote operation of the panel without direct physical contact, resolving the contradiction between operational ease and system complexity
2Reliability
If the elevator car interior space is limited, then the structure remains compact, but technician access to the ceiling area becomes unsafe
Solution Approach 1:
A working platform is pre-positioned within the ceiling access panel assembly. When the panel is opened, the platform is automatically deployed to provide immediate support for the technician. This preliminary preparation of the working position eliminates the need for technicians to climb or reach into confined spaces, improving safety while adding only minimal system complexity
Solution Approach 2:
The working platform is nested within the ceiling access panel structure when closed, and deploys outward when opened. This nesting arrangement allows the platform to be stored compactly within the limited elevator car interior space while being readily available when needed, resolving the contradiction between safety and structural compactness
3Strength
If locking pins are used to secure the ceiling panel, then the panel remains securely closed, but the locking mechanism becomes complex
Solution Approach 1:
The locking function is extracted from the panel itself and implemented through separate locking pins that engage with the panel frame. These pins are actuated independently by cables from the drum sheave, simplifying the overall locking mechanism while maintaining strong secure closure. The locking pins can be released remotely without complex mechanical linkages
Solution Approach 2:
The locking pins are designed to engage and disengage automatically through the cable tensioning system. When the drum sheave is rotated, the cables automatically tension to pull the pins out of engagement, and spring force or gravity causes them to reset when tension is released. This self-service mechanism maintains strong locking security while minimizing the complexity of the locking 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 easy and safe access to elevator car tops without additional tools, suitable for taller cars, reducing safety risks and simplifying maintenance operations.
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
Data Source
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.