Sliding Door Roller Carrier Anti-Lift Mechanism
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Solution Overview
Problem
Existing sliding door fittings require significant horizontal space for anti-lift and anti-jemmy mechanisms, compromising compact design and ease of operation.
Innovation Solution
A compact sliding door fitting with a vertically guided anti-lift device using a tab that reaches under the rail, secured by a spring and curved guides, allowing minimal horizontal installation space and easy actuation via a handle section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a horizontally displaceable molded part is used to secure the roller carrier on the rail, then the roller carrier can be locked and unlocked, but the mechanism requires a relatively large amount of space in the horizontal direction
Solution Approach 1:
The patent transitions the anti-lift device from horizontal displacement to vertical movement. The tab is guided to move vertically along the curved guide instead of horizontally, thereby reducing the horizontal space requirement while maintaining the locking and unlocking functionality through vertical positioning changes.
Solution Approach 2:
Instead of moving the locking element horizontally as in prior art, the patent inverts the approach by moving it vertically. The tab engages with the curved guide which has a horizontal end section that provides locking when the tab is in the upper position, and unlocking occurs when the tab is lowered vertically.
2Area of moving object
If a vertically guided anti-lift device with a tab is used to reduce horizontal space, then compact design is achieved, but the device must be reliably guided in the vertical direction
Solution Approach 1:
The patent employs a curved guide with a specific geometry that includes a vertical section and a horizontal end section. This curved path provides reliable guidance for the tab during vertical movement while the horizontal end section ensures stable engagement in the locked position, preventing any lateral deviation.
3Area of moving object
If the anti-lift device is moved in the vertical direction to secure the roller, then minimal installation space is required, but the device must be easily actuated
Solution Approach 1:
The spring is pre-loaded to automatically push the tab into the engaged position with the curved guide when the roller carrier is installed. This preliminary action ensures that the locking mechanism is automatically activated without requiring manual intervention, while still allowing easy manual actuation when needed.
Solution Approach 2:
The spring-loaded tab automatically performs the locking function by engaging with the curved guide on its own, without requiring external actuation for normal operation. The system serves itself by automatically maintaining the locked position through the spring force, while remaining easily unlockable when intentionally actuated.
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 provides stable protection against lifting with minimal space requirements, ensuring secure roller retention and easy operation, particularly suitable for rear sliding doors.
Implementation Method 1
a spring is preferably provided, by means of which the anti-lift device is prestressed
Implementation Method 2
For safe guidance of the anti-lift device, it is guided via an upper and a lower curved guide on the vertical wall section
Data Source
Figure 1~3
Figure 4A~5
Figure 6A~6B
AI summary
The invention relates to a fitting (2) for a sliding door (1) comprising a roller carrier (3), on which one or more rollers (5) are rotatably mounted, wherein said rollers roll on a rail (6), wherein a lift-out protection mechanism (11) is guided on the roller carrier (3), said lift-out protection mechanism allowing the roller carrier (3) to be lifted in a first position and preventing the roller carrier (3) from being lifted from the rail (6) in a locked second position, wherein the lift-out protection mechanism (11) comprises a tab (10), which reaches under the rail (6) in the locked position and can be lowered in order to release the tab from the rail (6).