Retractable Elevator Handrail Assembly for Space-Constrained Car Tops
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Solution Overview
Problem
The existing handrail assemblies for cars, used during elevator maintenance, are limited by space constraints and require a solution that enhances space usage efficiency while ensuring safety by adjusting height according to maintenance needs.
Innovation Solution
A handrail assembly that can selectively retract and extend, featuring a fixing portion with hollow vertical posts, movable lifting portions, a limiting component for sequential ascent and descent, and a sensing mechanism with a safety lock for secure operation, allowing height adjustment from less than 945 mm to over 1100 mm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the handrail height is increased to above 1100 mm for safety, then safety protection is improved, but space usage efficiency deteriorates due to limited space on the car top
Solution Approach 1:
The handrail assembly is designed with movable lifting portions that can dynamically adjust between retracted and extended positions. The lifting portions are guided by limiting components to ascend and descend in sequence, transforming the static handrail into a dynamic structure that adapts its height based on operational requirements, thus resolving the contradiction between safety height and space efficiency
Solution Approach 2:
The lifting portions with second vertical posts are designed to nest within the hollow first vertical posts when in the retracted position. This nesting arrangement allows the handrail to occupy minimal space during normal operation while still providing the capability to extend to full safety height when needed, effectively addressing both space constraints and safety requirements
2Volume of moving object
If the handrail is made retractable to improve space usage, then space efficiency is improved, but device complexity increases due to additional moving components
Solution Approach 1:
The handrail assembly is segmented into multiple lifting portions, each with its own limiting component and sequential movement capability. This segmentation allows the complex function of retractability to be divided into simpler, independent modules that can be manufactured and assembled separately, reducing overall device complexity while maintaining the space-saving benefit
Solution Approach 2:
The limiting components are designed to automatically guide the lifting portions to ascend and descend in sequence without requiring external control mechanisms. The mechanical design of the limiting components themselves provides the control logic, allowing the system to self-regulate its movement sequence and reducing the need for additional complex control systems
Data Source
AI summary
A handrail assembly, a car and an elevator. The handrail assembly includes a fixing portion and a moving portion, the fixing portion comprises a plurality of first vertical posts arranged in a vertical direction, wherein the first vertical posts are configured to be hollow; the moving portion comprises: a plurality of lifting portions each comprising a plurality of second vertical posts movable into the first vertical posts and horizontal posts attached between the second vertical posts, wherein each lifting portion is configured to move at least between the extended position and the retracted position, the horizontal post is adjacent to the fixing portion when in the retracted position, and the horizontal post is away from the fixing portion when in the extended position; a limiting component to make each lifting portion ascend or descend in sequence in the vertical direction; and a sensing mechanism.