Drawer Pull-Out Guide With Cylindrical Rollers for Compact Load Support
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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 and limited width utilization.
Innovation Solution
The use of cylindrical rolling bodies arranged in three separate running planes with horizontally extending rotational axes, providing a stable and compact construction that distributes forces over a larger area and allows for improved lateral support and reduced deformation risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If ball rolling bodies are used in drawer pull-out guides, then the guiding function is achieved, but the useable width is only approximately 70% of the ball width, leading to wasted constructional space and increased weight
Solution Approach 1:
The invention changes the geometric parameter of the rolling body from spherical to cylindrical form. This parameter change allows the rolling bodies to utilize the full width of the running carriage, achieving 100% space utilization compared to approximately 70% for balls. The cylindrical shape eliminates the wasted constructional space while maintaining the low-friction rolling function.
2Reliability
If ball rolling bodies are used with punctiform contact surface, then the guiding function is achieved, but high surface pressure occurs leading to undesired deformations of the balls
Solution Approach 1:
The invention changes the contact surface parameter from punctiform (point contact) to linear contact by using cylindrical rolling bodies. The cylindrical form creates a line contact between the rolling body and the guide rails, distributing the load over a larger surface area. This reduces the surface pressure and prevents deformations, improving reliability.
3Volume of moving object
If cylindrical rolling bodies with horizontal rotational axes are used, then space usage is optimized, but the construction of the running carriage becomes more complex requiring stable interconnection in restricted space conditions
Solution Approach 1:
The invention arranges the cylindrical rolling bodies in at least three running planes lying above one another, utilizing the vertical dimension within the restricted rail profile space. This three-dimensional arrangement optimizes space usage by distributing rolling bodies across multiple height levels, while the running carriage structure provides stable interconnection between rolling bodies in different planes.
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 enhances the stability and compactness of the drawer pull-out guide, reduces deformation risk, and effectively absorbs lateral tilting moments, while optimizing space usage within the rail profile.
Implementation Method 1
the running carriage enables 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
Data Source
AI summary
A drawer pull-out guide includes a first guide rail, a second guide rail displaceably supported relative to the first guide rail, and a running carriage which is displaceably supported between the first guide rail and the second guide rail. The running carriage includes at least three rolling bodies, each having a cylindrical form and being rotatable about a horizontally extending axis in a mounted position of the drawer pull-out guide. The at least three rolling bodies, in the mounted position of the drawer pull-out guide, are arranged in at least three running planes lying above one another.