Pull-Out Drawer Guide Synchronization to Reduce Running Errors
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Solution Overview
Problem
Existing pull-out runner systems for drawers often suffer from rail and carriage misalignments, leading to running errors that can result in the drawer being left open, which is visually disturbing and potentially dangerous, due to increased frictional resistance and the need for additional components.
Innovation Solution
A synchronization device with two pinion wheels of different diameters, connected in a rotationally fixed manner, is used to provide a direct coupling between a movable rail and a carriage, reducing the number of components and frictional resistance by allowing a single rack to be arranged on one rail, and enabling form-fitting, non-slip synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If toothed racks are attached to both body rail and drawer rail and two gear wheels are used for synchronization, then synchronization between rails and carriages is achieved, but the number of components increases and frictional resistance becomes considerable
Solution Approach 1:
The patent combines the synchronization function into a single gear wheel that simultaneously engages with both the body rail and drawer rail. This single gear wheel integrates the functions of what would otherwise require two separate gear wheels and multiple toothed racks, thereby reducing the total number of components while maintaining synchronization accuracy between all moving elements.
Solution Approach 2:
The single gear wheel serves multiple functions: it synchronizes the body rail, drawer rail, and both carriages simultaneously. This multi-functional component replaces what would traditionally require multiple specialized components, reducing overall system complexity while achieving comprehensive synchronization across all rails and carriages.
2Reliability
If toothed racks are attached to both body rail and drawer rail and two gear wheels are used for synchronization, then synchronization is achieved, but frictional resistance becomes considerable making the drawer pull-out guide difficult to run
Solution Approach 1:
By merging the synchronization function into a single gear wheel that engages with both rails, the patent reduces the total number of meshing interfaces from four (two gear wheels with two racks each) to two (one gear wheel with two racks). This reduction directly decreases the cumulative frictional resistance, making the drawer pull-out guide easier to operate while maintaining reliable synchronization.
3Speed
If dampers are used to reduce closing speed, then the last closing range is dampened, but closing dynamics are reduced and kinetic energy is insufficient to compensate for running errors
Solution Approach 1:
The synchronization device performs preliminary action by continuously maintaining accurate alignment between all rails and carriages throughout the movement. This prevents running errors from accumulating in the first place, eliminating the need for dampers to compensate for errors at the end of the closing motion. The system proactively prevents misalignment rather than reactively correcting it.
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 effectively prevents running errors by ensuring precise alignment and reducing frictional resistance, allowing for smoother operation and safer drawer closure, while also reducing the overall number of components and enhancing force distribution.
Implementation Method 1
the synchronization wheel as a gear wheel with two pinion wheels is formed with different diameters
Implementation Method 2
a synchronization device has at least one synchronization wheel which interacts on the one hand with the at least one carriage and on the other hand with a running surface arranged on one of the rails
Data Source
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AI summary
A pull-out guide (4) for drawers (3) having a carcass rail (5) which can be attached to a carcass (2) of an item of furniture, a drawer rail (7) which can be attached to the drawer (3), and a central rail (6) which is moveably mounted between the carcass rail (5) and the drawer rail (7), wherein at least one carriage (8, 9) is mounted in moveable manner between at least two rails (5, 6, 7) of the pull-out guide (4), and wherein a synchronization apparatus (10) for avoiding running faults of the pull-out guide (4) is provided, wherein the synchronization apparatus (10) has at least one synchronization wheel (11) which interacts firstly with the at least one carriage (8) and secondly with a running surface (12) which is arranged on one of the rails (5, 6, 7), and wherein the synchronization wheel (11) is in the form of a gear with two pinions (11a, 11b) with different diameters, wherein the first pinion (11a) and the second pinion (11b) are connected to one another in a rotationally fixed manner, wherein, when one pinion (11a, 11b) moves, the other pinion (11b, 11a) also moves.