Roller Guide Offset Contact Surface for Sliding Door
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Solution Overview
Problem
Existing roller guides for sliding doors face challenges in avoiding flat areas on rollers, which lead to discomfort during handling and potential noise issues due to material deformation, and require complex assembly with additional components like ramps.
Innovation Solution
The roller guide's base is designed with an offset contact surface in the closed position relative to the opening position, using a geometry that changes the contact surface without needing additional components, ensuring smooth transition and avoiding flattening by maintaining the roller's axis height constant, with wedge-shaped legs and a central planar area for centered movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the roller remains in constant contact with the same running surface in closed position, then the structure is simple, but the roller develops flat areas causing noise and discomfort
Solution Approach 1:
The guide rail base is designed with wedge-shaped legs that create different contact conditions dynamically based on the roller position. In opening area, the roller contacts the circumferential running surface. In closed position, the roller is lifted slightly and contacts a different area of the running surface, preventing flat spot formation while maintaining structural simplicity
Solution Approach 2:
The running surface of the roller is designed with differentiated zones: a circumferential running surface for the opening area and a different contact area for the closed position. This local differentiation ensures that the roller surface used in opening mode is protected from the flattening forces experienced in closed position
2Reliability
If additional ramp components are mounted on the guide rail to lift the sash, then flat areas on rollers are avoided, but assembly becomes complex and handling is difficult
Solution Approach 1:
The lifting function previously requiring separate ramp components is merged into the guide rail base structure itself. The wedge-shaped legs integrated into the base perform the lifting action naturally through their geometry, eliminating the need for additional ramp pieces while maintaining the protective effect against roller flattening
Solution Approach 2:
The guide rail base structure serves multiple functions simultaneously: it provides structural support, guides the roller movement, and through its wedge-shaped leg geometry, automatically performs the lifting function to prevent roller flattening without requiring additional components or complex assembly
3Reliability
If the roller is lowered into closed position to change contact surface, then flattening is avoided, but vertical movement is noticeable and handling becomes less comfortable
Solution Approach 1:
The system dynamically adjusts the contact point on the roller surface through the wedge-shaped legs of the guide rail base, but maintains the roller axis at constant height. This dynamic contact surface change protects against flattening while keeping the movement imperceptible to users
Data Source
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AI summary
The invention relates to a roller guide (1), in particular for a sliding door, comprising at least one roller (5) rotatably mounted on a carriage (4) and rolling on a floor (8) of a guide rail (3), wherein the roller (5) can be displaced from a closed position into an opening area, wherein the floor (8) of the guide rail (3) is designed so that the contact surface (11, 12) of the roller (5) on the floor (8) in the closed position is offset relative to the opening area in the axial direction of the rotary axis of the roller (5).