False Car Elevator Guide Rail Centering Platform
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Solution Overview
Problem
Existing elevator hoistway work platforms, such as scaffolding and false cars, lack efficient and safe mechanisms for vertical movement and centering on guide rails, which complicates the installation and maintenance of elevator components.
Innovation Solution
A false car device with a platform assembly, frame assembly, and lift assembly, equipped with safety and guide assemblies, that uses opposing guide shoes to center on a guide rail, facilitating vertical movement and providing a secure temporary work platform within the elevator hoistway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If scaffolding is used as a temporary work platform, then it can be assembled to form a working platform, but it lacks efficient mechanisms for vertical movement and centering on guide rails
Solution Approach 1:
The false car device combines multiple functions into a single unit: it serves as both a work platform and a centering gauge, and includes integrated lift and safety mechanisms. This eliminates the need for separate scaffolding assembly and centering operations, directly resolving the contradiction by providing ease of operation without adding complexity.
Solution Approach 2:
The guide shoes automatically center the false car on the guide rails through gravitational and contact forces, without requiring external centering mechanisms. The safety ropes automatically engage to prevent falls, eliminating the need for complex manual safety systems. This self-centering and self-safeguarding capability improves ease of operation while minimizing added complexity.
2Reliability
If false car is used as a temporary work platform, then it can travel vertically within the hoistway, but it lacks safe mechanisms for vertical movement and centering
Solution Approach 1:
The safety ropes are pre-installed and positioned to automatically engage if the lift assembly fails or the false car drops. This beforehand safety provision ensures reliability without requiring complex active safety systems, as the passive safety ropes are always in position to catch any fall.
Solution Approach 2:
The guide shoes act as an intermediary between the false car and the guide rails, providing both centering functionality and safety through controlled contact. This intermediary component simplifies the overall safety mechanism by using the existing guide rail infrastructure rather than requiring separate complex safety systems.
3Ease of manufacture
If traditional work platforms are used, then they can provide a temporary working surface, but they complicate the installation and maintenance of elevator components
Solution Approach 1:
The false car serves multiple purposes: it is both a work platform for installation/maintenance and a precision gauge for centering equipment on the guide rails. This dual functionality simplifies the installation process by eliminating the need for separate centering operations, directly addressing the contradiction between ease of manufacture and device complexity.
Solution Approach 2:
The false car automatically centers itself on the guide rails through the guide shoes, without requiring complex alignment procedures or specialized installation equipment. This self-centering capability makes the installation process simpler and more straightforward, resolving the contradiction by improving ease of manufacture while not increasing device complexity.
Data Source
AI summary
An installation gauge for use in an elevator hoistway is provided. The installation gauge includes a platform assembly and a frame assembly configured to support the platform assembly. The frame assembly includes one or more safety assemblies and one or more guide assemblies. Opposing guide shoes are connected to each of the one or more guide assemblies. The opposing guide shoes are centered about a guide rail and configured to determine a centerline of the guide rail. A lift assembly is configured to facilitate hoisting of the platform assembly and the frame assembly within the elevator hoistway. A plurality of safety ropes couples the lift assembly to the one or more safety assemblies. A climbing rope is attached to the lift assembly. The determination of the centerline of the guide rail can be used as a basis to install other hoistway equipment.