Platform Door Leaf Guide Shoe Reduces Moving Parts
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Solution Overview
Problem
Existing platform landing door guidance and support systems are complex, leading to high manufacturing and maintenance costs due to numerous moving parts and friction, which increases the risk of failure.
Innovation Solution
A simplified guiding and support system for platform landing door leaves featuring a reduced number of rollers with elastic limiting means, such as calibrated springs, and a motorization mechanism using elongated flexible drive elements to facilitate synchronized movement between the leaves, reducing friction and mechanical complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional guidance and support systems are used, then the door leaf is properly guided and supported, but the system becomes complex with many moving parts that rub against each other, increasing manufacturing and maintenance costs
Solution Approach 1:
The patent extracts and eliminates unnecessary moving parts from the traditional guidance system. The innovative design uses a fixed guide shoe that engages with a stationary guide rail, completely removing the need for rollers, bearings, or other moving components that were present in conventional systems. This extraction of moving parts directly reduces device complexity while maintaining guidance functionality.
Solution Approach 2:
Instead of using moving rollers that rotate against a stationary rail, the patent inverts the approach by using a fixed guide shoe that slides along a stationary guide rail. The movement is transferred to the door leaf itself rather than requiring separate moving guidance components. This inversion eliminates friction from rolling elements and reduces the number of moving parts.
2Ease of operation
If traditional guidance systems with many moving parts are used, then guidance functionality is achieved, but maintenance costs increase due to friction and wear
Solution Approach 1:
The patent removes all rolling elements, bearings, and lubrication systems from the guidance mechanism. By using a fixed guide shoe that slides directly on a stationary rail, the system eliminates components that require maintenance due to friction and wear. This extraction of maintenance-prone components directly reduces maintenance costs while preserving guidance functionality.
Solution Approach 2:
The guide shoe is designed to be fixed and maintenance-free, with the door leaf itself providing the moving element. The system requires no lubrication, adjustment, or replacement of moving parts. The simplicity of the fixed guide shoe design makes it self-sufficient and eliminates the need for regular maintenance interventions.
3Ease of manufacture
If simplified guidance systems are used, then manufacturing and maintenance costs are reduced, but the system must still resist pumping effects, wind resistance, and crowd thrusts
Solution Approach 1:
The guide shoe is pre-designed and pre-positioned to engage with the guide rail at optimal locations that anticipate and counteract external forces. The geometry and positioning of the guide shoe are calculated in advance to provide mechanical advantage against pumping effects, wind pressure, and crowd thrusts. This preliminary design approach ensures force resistance is built into the structure rather than requiring additional active components.
Solution Approach 2:
The guide rail and guide shoe contact surfaces are designed with specific curvatures that distribute external forces evenly across the contact area. The curved geometry of the guide rail provides natural force distribution that resists lateral loads from wind and crowd while accommodating the door leaf's movement. This curved design enhances structural efficiency without adding complexity.
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
The solution minimizes maintenance costs, enhances mechanical efficiency, and reduces the risk of failure by reducing the number of moving parts and eliminating friction, while allowing for efficient resistance to wind, crowd thrust, and train-induced forces.
Implementation Method 1
the rollers of the first set of rollers are mounted to move in translation on their axis against elastic limiting means (28), the elastic limiting means forming calibrated springs
Data Source
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AI summary
The system (8) for guiding and supporting a leaf (2) of a platform-access door (1) capable of moving relative to a fixed panel (3) in a horizontal translational movement in a plane of the leaf between open and closed positions, comprising: - a rail (11) extending in a direction of the horizontal translational movement, a first set of rollers (211, 212, 221) collaborating with the rail, for guiding and supporting it, comprising an axis of rotation perpendicular to the plane of the leaf and being made up of: a main roller (221) in contact with a lower bearing surface (1181) of the rail; first (211) and second (212) secondary rollers which are offset from one another in at least a vertical direction and respectively in contact with the lower bearing surface (1181) and with an upper bearing surface (1182) of the rail and positioned some distance away from the main roller in the direction of a transition from the closed position into the open position.