Railway Vehicle Doorframe Assembly With Precision Repositioning

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Solution Overview

Problem

The assembly of a doorframe in a railway vehicle door opening is complex due to the need for precise adjustment of holding devices during glue drying, which is difficult to achieve with existing methods.

Innovation Solution

A system comprising a positioning reference plate and a holding device with complementary solidarizing means allows for easy and precise positioning of the doorframe by adjusting the holding device's position using screws and pins, ensuring accurate placement before and after glue application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If the holding device is precisely adjusted during gluing, then the positioning precision is improved, but the operation complexity increases

Engineering Contradiction:

Improvepositioning precisionVSAvoidoperation complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The positioning reference plate is mounted on the structural part before the holding device is positioned. This preliminary action establishes a fixed reference framework that guides the holding device to the correct position, eliminating the need for complex real-time adjustments during the gluing operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The positioning reference plate acts as an intermediary element between the structural part and the holding device. It provides reference features (such as holes or slots) that the holding device aligns with, serving as a mediator that simplifies the positioning process while ensuring precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the holding device is removed for glue application, then the ease of operation is improved, but the time consumption increases

Engineering Contradiction:

Improveease of glue applicationVSAvoidtime consumption

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The positioning reference plate is installed beforehand on the structural part, creating a ready-to-use reference system. This allows the holding device to be quickly removed and later repositioned without time-consuming adjustments, as the reference plate maintains the correct positioning throughout the process.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If the holding device is precisely repositioned after removal, then the manufacturing precision is improved, but the difficulty of operation increases

Engineering Contradiction:

Improverepositioning precisionVSAvoiddifficulty of repositioning

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The positioning reference plate serves as a permanent intermediary reference on the structural part. When the holding device needs to be repositioned after glue application, it simply aligns with the same reference features on the plate, making repositioning as easy as the initial positioning while maintaining high precision.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4497649B1System for assembling a doorframe in a door opening of a structural part of a railway vehicle

Publication Date: 2025.10.29 ALSTOM HOLDINGS SA

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AI summary

An assembling system (10) for assembling a doorframe (18) in a door opening (20) of a structural part (22) of a railway vehicle, comprising a holding device (12) intended to hold the doorframe (18). The assembling system (10) comprises a positioning reference plate (14) intended to be adjustably mounted on the structural part (22) near to the door opening (20), the holding device (12) and the positioning reference plate (14) comprising complementary solidarizing means (34).