Drawer Pull-Out Guide With Load-Shifting Support Rollers
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Solution Overview
Problem
Existing pull-out guides for drawers face issues with the deformation of plastic rollers under high loads, leading to compromised running behavior over time, as they are subjected to significant stress in the closed position.
Innovation Solution
Incorporating additional load-transmitting elements on a bracket that can move beyond the end of the first rail during extension, which supports the drawer in the closed position and takes load off the primary rolling elements, allowing them to deform without affecting the guide's functionality during sliding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plastic rollers are used as load-transmitting elements, then the pull-out guide can operate smoothly during sliding movement, but the rollers deform under high loads in the closed position, adversely affecting running behavior over time
Solution Approach 1:
The load-transmitting elements are segmented into two distinct groups: rolling elements (for smooth sliding operation) and support elements (for bearing high static loads). This segmentation allows each group to be optimized for its specific function, resolving the contradiction between smooth operation and load-bearing reliability.
Solution Approach 2:
Different parts of the carriage have different functional qualities: the rolling elements are positioned to engage with the rail during movement for smooth operation, while support elements are positioned to bear the brunt of static loads in the closed position. This local differentiation of function allows the system to achieve both smooth operation and high load reliability simultaneously.
2Force
If the drawer is in the closed position with high load, then the foremost load-transmitting elements are subjected to considerable load, but this causes deformation of plastic rollers over time
Solution Approach 1:
The function of bearing static load is extracted from the rolling elements and assigned to dedicated support elements. These support elements are specifically designed to handle high static loads without deforming, while the rolling elements are freed from this burden and can maintain their shape and rolling function over time.
Solution Approach 2:
The support elements are designed as sacrificial components that can deform or wear under high static loads without affecting the overall system functionality. By using simpler, more replaceable support elements to absorb the deformation stress, the more critical rolling elements are protected from damage, extending the service life of the entire pull-out guide.
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
This solution enhances the service life and load distribution of the pull-out guide by isolating the primary rolling elements from excessive stress, ensuring smooth operation and preventing premature deformation.
Implementation Method 1
a bearing group with load-transmitting elements, preferably rollers, rolling elements and/or balls
Implementation Method 2
at least one additional load-transmitting element is provided, which is arranged on a bracket at a distance from the bearing group... these additional load-transmitting elements... preferably only serve to support the drawer in its closed position
Data Source
Figure 1
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Figure 3
AI summary
The invention relates to a pull-out guide (4) for drawers (3a, 3b) comprising a first rail and at least one second rail (6, 7), at least one carriage (8) being arranged between said two rails (6, 7). The carriage comprises a bearing group (9b) containing load-transmitting elements (10, 10a), preferably rollers, rolling bodies and/or balls. The load-transmitting elements (10, 10a) guide the bearing group (9b) in the vertical direction and in the horizontal direction. At least one additional load-transmitting element (12) is arranged on a bracket (15), at a distance from the bearing group (9b). When the second rail (7) is pulled out, the additional load-transmitting element (12) can at least partially move out over the end of the first rail (6), such that it no longer lies on the first rail (6).