Drawer Guide Running Carriage With Offset Cylindrical Rollers
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Solution Overview
Problem
Existing drawer pull-out guides with ball rolling bodies suffer from inefficient use of space, increased weight, and high surface pressure leading to deformations due to point contact, while cylindrical rollers are not designed for load transmission.
Innovation Solution
The use of laterally offset cylindrical rolling bodies with horizontally extending rotational axes in a common running plane allows for improved load transmission and reduced deformation risk by distributing forces over a larger area, enabling a stable and compact construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ball rolling bodies are used in a running carriage, then the guide rails can be supported relative to one another, but the useable width of the balls is only utilized to approximately 70%, resulting in wasted constructional space and increased weight
Solution Approach 1:
The patent changes the geometric parameters of the rolling bodies from spherical to cylindrical form with horizontally extending rotational axes. This parameter change allows the rolling bodies to be laterally offset while maintaining the same diameter, optimizing space utilization and reducing weight by approximately 30% compared to ball guides.
2Reliability
If ball rolling bodies are used in a running carriage, then the guide rails can be supported relative to one another, but the contact surface is only punctiform, leading to high surface pressure and undesired deformations
Solution Approach 1:
The patent changes the contact geometry from point contact (spherical) to line contact (cylindrical). The cylindrical rolling bodies with horizontally extending rotational axes create a linear contact surface with the guide rails, distributing the load over a larger area and reducing surface pressure and deformations.
3Ease of manufacture
If cylindrical rollers with vertically extending rotational axes are used (as in GB 2 453 326 A), then the running carriage can be constructed, but the rolling bodies are not configured for transmitting load
Solution Approach 1:
The patent applies asymmetry by orienting the rotational axes of the cylindrical rolling bodies horizontally rather than vertically. This asymmetric orientation enables the rolling bodies to effectively transmit load between the guide rails while maintaining ease of manufacture with standard cylindrical rollers.
4Strength
If rolling bodies with different widths and sizes are used, then the load transmission can be optimized, but the assembly of the running carriage becomes more complex
Solution Approach 1:
The patent establishes universality by designing the running carriage to accommodate standard cylindrical rolling bodies with a single predetermined width and diameter. The laterally offset arrangement of multiple identical rolling bodies achieves optimal load transmission without requiring custom-sized components, simplifying assembly and manufacturing.
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 configuration optimally absorbs lateral tilting moments and simplifies production by using standard rolling bodies, reducing the risk of deformations and enhancing the stability and compactness of the running carriage.
Implementation Method 1
running carriages enable a low-frictional and precise translation of the guide rails to one another. These running carriages (or cages of running carriages) include rolling bodies (for example in the form of cylinders, balls or cones) configured to run along running limbs provided on the guide rails
Implementation Method 2
lateral tilting moments, which are exerted due to a load of the drawer onto the guide rails, can be transmitted via the laterally offset rolling bodies in an improved manner and can therewith be optimally absorbed
Data Source
AI summary
A drawer pull-out guide includes a first guide rail, a second guide rail displaceably supported relative to one another, and a running carriage having load-transmitting rolling bodies displaceably arranged between the first guide rail and the second guide rail. The running carriage includes at least two rolling bodies rotatable about a rotational axis, and the at least two rolling bodies—in a view onto a plane perpendicular to a longitudinal direction of the guide rails—are arranged so as to be laterally offset to one another. Each of the at least two rolling bodies has a cylindrical form and is rotationally supported about a horizontally extending rotational axis in a mounted position of the drawer pull-out guide, the rotational axes of the at least two rolling bodies are arranged in the same running plane, and the at least two rolling bodies have the same diameter.