Sheet-Metal Handrail for Escalator Crack and Vandal Resistance
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Solution Overview
Problem
Existing escalator and moving walkway handrails are complicated to install, expensive to produce, prone to environmental aging, cracking, and vulnerable to vandalism, with issues related to weight, hygiene, and germ proliferation.
Innovation Solution
A handrail made of a sheet-metal band divided into edge and central portions with beads, allowing for easy assembly and reduced weight, featuring a metal surface that is vandal-proof, hygienic, and resistant to cracking, with transverse grooves for improved flexibility and engagement elements for drive wheel integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handrails are made from fabric layers and rubberized materials, then they provide comfortable grip and flexibility, but they are subject to environmental aging, cracking, and vandalism
Solution Approach 1:
The patent changes the fundamental material parameter from organic materials (fabric and rubber) to inorganic material (metal sheet). This transformation eliminates the chemical degradation mechanisms that cause aging and cracking in rubberized handrails, while the metal surface provides inherent resistance to vandalism and does not support germ proliferation.
2Length of moving object
If handrails are produced continuously with specific length adaptation, then they fit the escalator dimensions, but the production process becomes complicated and installation/maintenance is limited due to high weight
Solution Approach 1:
The handrail is designed as a modular system consisting of multiple identical metal sheet components rather than a single continuous custom-length piece. Each module can be independently produced, transported, and installed, then connected to form the complete handrail assembly, simplifying both production and installation processes.
Solution Approach 2:
The material change from rubberized fabric to metal sheet fundamentally alters the weight parameter, reducing it significantly. This weight reduction directly improves handling ease during installation and maintenance operations while maintaining the required length adaptation through modular assembly.
3Ease of operation
If handrail belts are spaced apart during operation, then they allow passage of objects, but they reduce the effective handrail surface area
Solution Approach 1:
The metal sheet handrail features a continuously curved cross-sectional profile without gaps or separations. The curved geometry provides a smooth continuous surface for hand contact while the overall handrail assembly configuration allows object passage, maintaining both ergonomic functionality and maximum surface area.
4Stability of the object's composition
If the handrail is made as an integral component, then it provides structural stability, but it increases weight and complicates installation and maintenance
Solution Approach 1:
The handrail system is divided into multiple identical modular components made from metal sheets. Each module maintains structural integrity through its own geometry and connections, providing stability while the modular nature enables simple installation and maintenance through individual module replacement or adjustment.
Data Source
AI summary
The disclosure relates to a handrail for a passenger transportation system in the form of an escalator or moving walkway. The handrail can include a sheet metal strip having two edge portions and a middle portion that is located between the two edge portions. The edge portions can each bent to form a bead, and the middle portion can form a handrail back extending between the beads for a hand to be placed thereon.