Sliding Door Carriage with Conical Rollers
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Solution Overview
Problem
Conventional sliding door fitting arrangements are difficult to install and maintain, with complex integration requirements and accessibility issues due to the placement of carriages and rollers, and are prone to blocking by granular materials.
Innovation Solution
A fitting arrangement for sliding doors featuring a carriage with conical rollers that flank the door's lower edge, allowing easy access for maintenance and assembly, and a running rail with a convex cross-sectional shape that maximizes contact area and centering, reducing the risk of blocking by granular materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the carriage and rollers are integrated into the lower edge of the sliding door, then the sliding door structure is compact, but the rollers become difficult to access for maintenance and complex integration is required
Solution Approach 1:
The carriage is separated from the sliding door panel into an independent component that can be easily attached and detached. The rollers are integrated into the carriage body, allowing the entire carriage assembly to be removed and replaced as a single unit, simplifying maintenance while maintaining compact overall structure.
Solution Approach 2:
The carriage is extracted from the door panel and positioned on the running rail instead. This allows the carriage to be easily accessed for maintenance by simply removing it from the rail, while the door panel itself remains simple and unaffected by the carriage integration complexity.
2Device complexity
If conventional cylindrical rollers are used, then the structure is simple, but granular material accumulates and causes blocking
Solution Approach 1:
The rollers are designed with a frustoconical shape (increasing diameter from one end to the other) rather than cylindrical. This curved geometry prevents granular material from accumulating in flat contact surfaces, as the material is pushed aside by the inclined surfaces, eliminating blocking while adding minimal structural complexity.
3Ease of manufacture
If the running rail has a flat cross-section, then manufacturing is simple, but the contact area with rollers is reduced and centering is poor
Solution Approach 1:
The running rail is given a convex cross-sectional shape instead of flat. This curved profile increases the contact area with the frustoconical rollers and provides automatic centering through the geometric relationship between the convex rail surface and the tapered roller surfaces, improving precision while remaining manufacturable.
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 enhances accessibility and ease of maintenance by allowing the carriage to be easily attached to the door's edge without complex integration, while the conical rollers and convex rail design prevent blocking and ensure smooth operation, improving usability and accessibility for users, including those with mobility aids.
Implementation Method 1
The carriage has a carriage body and at least two or a pair of rollers, which are rotatably mounted on the carriage body
Implementation Method 2
The running surface, viewed in cross-section, defines a height of the track that decreases towards both sides
Data Source
Figure 1
Figure 2
AI summary
A fitting arrangement for a sliding door comprises a carriage (14) that includes a carriage member (16) and at least two track rollers (20) which are mounted on the carriage member (16) in such a way as to be able to rotate about a common axis and which are located at a distance from each other in the direction of the axis. The track rollers (20) each have a diameter that increases or decreases as the distance from the other roller (20) increases.