Drawer Pull-Out Guide with Rail-Based Stop to Protect Running Carriage
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Solution Overview
Problem
Existing drawer pull-out guides subject the running carriage to excessive strains and risk of deformation or breakage due to absorption of kinetic energy and forces, particularly when reaching end positions or experiencing improper use.
Innovation Solution
A stop on the first rail and a counterstop on the second rail abut to prevent further movement when a predetermined force is exceeded, redirecting excessive forces to the rails and using a damping device like a spring tongue or fluid damper to absorb energy without straining the running carriage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the running carriage is designed with thin-walled plastic for compact design, then the device complexity is reduced, but the running carriage becomes susceptible to deformation or breakage under excessive forces
Solution Approach 1:
The patent implements a damping device with a damping element (such as a spring or elastomer) that is pre-installed on the running carriage to absorb kinetic energy before it can cause damage. This cushioning mechanism is activated when the running carriage abuts against the limiting element, preventing excessive forces from reaching the thin-walled plastic structure during normal operation and improper use scenarios.
Solution Approach 2:
The damping device acts as an intermediary element between the running carriage and the limiting element. When the running carriage hits the limiting element, the damping element deforms to absorb energy, mediating the force transmission and protecting the vulnerable thin-walled plastic structure from direct impact forces that would cause deformation or breakage.
2Strength
If spring buffers are added to the running carriage for dampening impacts, then the running carriage is protected from some strains, but the device complexity and space requirements increase
Solution Approach 1:
The patent employs a damping element made from flexible materials such as elastomers or springs that can deform under compression. This flexible dampening mechanism provides impact absorption functionality while maintaining a compact form factor, avoiding the need for bulky spring buffers and reducing overall device complexity compared to traditional rigid dampening solutions.
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 absorbs excessive forces by the rails, reducing the risk of deformation or breakage of the running carriage and ensuring safe operation by dissipating energy through the rail stops rather than the carriage.
Implementation Method 1
a damping device is arranged on the running carriage for dampening a movement of the running carriage over a damping path when the running carriage abuts against the limiting element
Implementation Method 2
at least one spring tongue arranged on the running carriage, which, when the running carriage abuts the limiting element, is configured so as to be reversibly bendable or reversibly deformable
Implementation Method 3
the stop of the first rail and the counterstop of the second rail abut against each other and thereby stop a movement of the second rail relative to the first rail
Data Source
AI summary
A drawer pull-out guide includes a first rail and a second rail displaceable relative to one another, and a running carriage with a rolling body. The running carriage is displaceably arranged between the first rail and the second rail over a travelling path. A limiting element is arranged on the first rail or on the second rail, and the limiting element limits the travelling path of the running carriage. A damping device is arranged on the running carriage for dampening a movement of the running carriage over a damping path when the running carriage abuts against the limiting element. At the end of a maximum damping path of the running carriage, a stop of the first rail and a counterstop of the second rail abut against each other and thereby stop a movement of the second rail relative to the first rail.