Drawer Pull-Out Guide Rail Structure for Even Rolling Wear
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Solution Overview
Problem
Drawer pull-out guides experience premature and uneven wear of rolling bodies due to tilting of the extension rail under heavy loads, leading to impaired functionality.
Innovation Solution
The carcass rail features a first and second limb portion, allowing tilting or bending to compensate for load-induced positional changes, ensuring the running limb and rolling body remain parallel and evenly loaded, with a force storage member providing a resetting force to maintain alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the extension rail is rigidly fixed to the carcass rail, then the structure is stable and strong, but the rolling bodies experience premature and uneven wear due to tilting under heavy loads
Solution Approach 1:
The carcass rail is designed with a flexible second limb portion that can dynamically tilt or bend in response to loading conditions. This dynamic adaptation allows the running limb to maintain proper alignment with the rolling bodies even when the extension rail is heavily loaded, preventing premature and uneven wear while preserving structural integrity through the controlled flexibility of the limb portion.
2Force
If the extension rail is made rigid to support heavy loads, then the load-bearing capacity is improved, but the tilting moment increases causing uneven wear of rolling bodies
Solution Approach 1:
The carcass rail is segmented into a first limb portion and a second limb portion, where the second limb portion is designed with flexible characteristics. This segmentation allows the first limb portion to maintain structural rigidity for load-bearing, while the second limb portion can tilt or bend to compensate for tilting moments, thereby supporting heavy loads without causing uneven wear on the rolling bodies.
3Ease of manufacture
If the carcass rail is made completely rigid, then manufacturing is simpler, but the running limb cannot compensate for positional changes under load
Solution Approach 1:
The second limb portion of the carcass rail is designed with specific flexible parameters that allow it to tilt or bend within controlled ranges. This parameter change from complete rigidity to controlled flexibility enables the running limb to automatically adjust its position to compensate for load-induced displacements, maintaining alignment precision without requiring complex manufacturing processes.
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 design prevents tilting of the extension rail, maintaining even wear and functionality of the drawer pull-out guide even under heavy loads by ensuring the running surface and rolling body remain aligned, reducing wear and strain on components.
Implementation Method 1
the second limb portion, upon a load of the extension rail about an axis extending in the longitudinal direction, can be tilted or bent in a direction towards the transverse limb
Implementation Method 2
a resetting force can be applied to the carcass rail in a direction of the zero position by the arrangement of a force storage member. The force storage member can either be formed by a mechanical spring element
Implementation Method 3
The force storage member can either be formed by a mechanical spring element, by an elastically yielding plastic material, and/or by an intrinsic elasticity of the carcass rail
Data Source
AI summary
A drawer pull-out guide includes a fastening portion having a vertical limb and a transverse limb protruding from the vertical limb. The transverse limb is connected to a limb of the carcass rail, an extension rail is displaceably supported relative to the carcass rail, and a rolling body is arranged between the carcass rail and the extension rail and is supported on a running limb of the carcass rail and/or the extension rail. The limb of the carcass rail has a first limb portion connected to the transverse limb. A second limb portion of the carcass rail, in an unloaded condition of the drawer pull-out guide, is spaced from the transverse limb by a gap, and can be tilted or bent towards the transverse limb. Therefore, a change of relative position between the running limb and the rolling body can be compensated for, and the gap can be reduced.