Sliding Door Roller Mechanism With Rotation-Limiting Bracket Stop

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Solution Overview

Problem

Existing roller mechanisms in sliding doors of commercial vehicles fail to prevent excessive bending and release of rollers due to manual force application, leading to potential door fall and safety hazards.

Innovation Solution

A roller mechanism with a bearing surface at the end of the body bracket that limits the rotation of the roller bracket after hitting the bumper, preventing slide deformation and ensuring secure door movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the roller bracket is allowed to rotate freely around the pin axis to accommodate bended slides, then the sliding door can move smoothly, but the slide may be excessively bent and the roller may be released from the slide causing safety hazards

Engineering Contradiction:

Improvesmooth movement of sliding doorVSAvoidsafety of sliding door system

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies preliminary anti-action by providing a limiting structure (bearing surface) that prevents the roller bracket from rotating beyond a safe angle. This limiting structure acts in advance to stop the rotational movement before it can cause excessive bending of the slide or release of the roller from the slide, thus preventing the harmful effect while allowing smooth operation within safe limits

Inventive Principle:

Principle #9Preliminary anti-action

2Speed

If users open the sliding door quickly by applying excessive force, then the door opens faster, but the slide is bended excessively and the roller is released from the slide

Engineering Contradiction:

Improvespeed of door openingVSAvoidstructural integrity of slide

Core Design Contradiction:

SpeedVSStrength

Solution Approach 1:

The limiting structure (bearing surface) is designed to counteract the excessive force applied by users during quick door opening. When the roller bracket rotates and hits the bearing surface, it prevents further rotation that would cause excessive bending, thus protecting the slide's structural integrity even when users apply excessive force for faster door opening

Inventive Principle:

Principle #9Preliminary anti-action

3Device complexity

If no limiting structure is provided for the roller bracket rotation, then the mechanism is simpler, but the slide may be excessively bent and the roller may be released from the slide

Engineering Contradiction:

Improvesimplicity of roller mechanismVSAvoidsecurity of roller on slide

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent incorporates a bearing surface as a limiting structure that is pre-designed into the mechanism. This bearing surface is positioned to limit the rotation of the roller bracket before excessive bending can occur. The limiting structure is integrated into the existing mechanism components, providing the necessary safety function with minimal additional complexity

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentEP4034398B1Roller mechanism with limited rotation

Publication Date: 2026.01.28 ROLLMECH AUTOMOTIVE SANAYI VE TICARET ANONIM SIRKETI

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AI summary

The invention relates to a roller mechanism (1) which is used in the sliding door vehicles and allows for moving the sliding door relative to the vehicle body; has the following; -at least one fixing bracket (10) which is fixed to the sliding door from one side thereof, -at least one body bracket (20) which can be contained integrally with said fixing bracket (10) or is engaged to the fixing bracket (10) as a separate part and helps to carry the door, -at least one roller bracket (30) which allows the sliding door to move in the slide (40) by engaging the same to said body bracket (20) rotatably with the axis pin (21).