Elevator LED Module Removal Mechanism
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Solution Overview
Problem
Downward illumination assemblies for elevator passenger compartments face maintenance challenges due to difficulty in removing and replacing lamps, and susceptibility to unauthorized access when designed for easy lamp replacement.
Innovation Solution
A downward illumination assembly with a lamp housing and module that allows easy removal and replacement from below, featuring heat transfer ribs and a low profile design, along with bracket engagement surfaces for secure mounting and tool-assisted installation/removal, ensuring secure and efficient lamp replacement without unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the lamp housing is designed to allow access from below for easy lamp replacement, then ease of repair is improved, but security against unauthorized access deteriorates
Solution Approach 1:
The lamp housing is divided into two distinct parts: a removable lamp module that can be accessed from below for easy replacement, and a fixed housing structure that remains secured to the ceiling. This segmentation allows the lamp to be easily replaced while the housing maintains its secure mounted position.
Solution Approach 2:
A tool-assisted removal mechanism serves as an intermediary between the lamp module and the housing. The lamp module includes engagement surfaces that interact with a removal tool, enabling controlled access from below while preventing unauthorized removal. The tool acts as a mediator that facilitates legitimate maintenance while blocking unauthorized access.
2Adaptability or versatility
If the assembly profile is reduced for tight installations, then adaptability is improved, but heat dissipation capability deteriorates
Solution Approach 1:
Heat dissipation is addressed by extending heat transfer ribs radially outward from the lamp housing in the horizontal dimension, rather than increasing the vertical profile height. This dimensional approach allows heat dissipation surface area to be increased without compromising the low-profile design, maintaining adaptability for tight installations.
Solution Approach 2:
The heat transfer ribs create an extended surface area that facilitates convective heat transfer to the ambient air mass. The rib structure effectively increases the heat dissipation capability without increasing the overall assembly profile, allowing the fixture to maintain a low profile while adequately managing thermal loads.
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
Facilitates easy and secure lamp replacement without needing access from above, reduces the assembly's profile for tight installations, and enhances convective heat transfer to prevent overheating, while maintaining light output comparable to standard fixtures.
Implementation Method 1
heat transfer ribs extending integrally and radially outward from the circumferential sidewall of the lamp housing at spaced locations around the lamp housing and configured to transfer to an ambient air mass, heat that has been generated by the lamp and conducted through the lamp module and the housing sidewall
Implementation Method 2
bracket engagement surfaces standing radially outward from the circumferential sidewall of the lamp housing far enough to allow angle brackets to be secured against the respective bracket engagement surfaces by a band encircling the heat transfer ribs
Data Source
AI summary
An illumination assembly comprising an LED module removably supported within a lamp housing configured to be mounted on an elevator ceiling panel in a position to direct light from the LED module downward into an elevator passenger compartment through an opening in the housing and a hole in the ceiling panel. The LED module is removable from the housing from below the ceiling panel through the housing opening and the hole in the ceiling panel. Threads formed in an inner cylindrical wall of the lamp housing receive threads formed in an outer circumferential surface of the LED module in threaded engagement. The LED module includes at least two LED module removal surfaces positioned to be engaged by respective engagement surfaces of a tool configured to apply torque to and rotate the LED module relative to the lamp housing.