Drawer Extension Guide Support Rollers for Closed-Position Stability
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Solution Overview
Problem
Extension guide fittings with running rollers mounted in their own carriages are more unstable in the closed condition, especially in full extension arrangements, due to uneven joint sizes and non-parallel contact with furniture bodies, leading to an undesirable running-on moment when approaching the closed position.
Innovation Solution
Mounting at least two stationary support rollers at the front end of the carrier rail allows the extension rail to be supported, enabling greater loading capacity, protecting the rail coating, and ensuring smoother drawer movement by providing additional support and adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If running rollers are mounted in their own carriages, then the load-transmitting elements are at the largest possible spacing from each other in the closed condition, but the extension guide fitting becomes more unstable in the closed condition
Solution Approach 1:
A stationary support roller is introduced as an intermediary element at the front end of the carrier rail. This support roller mediates between the extension rail and the carrier rail, providing additional support in the closed condition without interfering with the running rollers mounted in carriages. The stationary support roller acts as a mediator that enhances stability while allowing the running rollers to maintain their beneficial spacing.
2Ease of operation
If a run-on portion is mounted on the drawer rail, then the running-on movement of the drawer becomes gentler, but a moment is clearly felt when the run-on portion runs on to the carrier rail
Solution Approach 1:
The function of supporting the extension rail during closing is extracted from the run-on portion and assigned to a dedicated stationary support roller. This separation allows the run-on portion to focus on providing gentle approach movement while the stationary support roller handles the support function, preventing the undesirable moment that occurs when the run-on portion contacts the carrier rail.
3Device complexity
If only one stationary support roller is mounted at the front end of the carrier rail, then the structure is simple, but it cannot carry greater loading or protect the coating on extension rails effectively
Solution Approach 1:
The support function is segmented into multiple stationary support rollers mounted at the front end of the carrier rail. Instead of relying on a single support point, the load is distributed across multiple rollers, which increases loading capacity and provides better protection for the coating on the extension rail by spreading the contact pressure.
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
The solution enhances the stability and smoothness of drawer movement, particularly in full extension scenarios, by distributing the load more evenly and preventing damage to the extension rail coating, while accommodating varying production tolerances and loading conditions.
Implementation Method 1
Mounted in the front region of the carrier rail are at least two support rollers on which the extension rail runs with its running limb
Data Source
AI summary
An extension guide fitting for drawers includes an extension rail at the drawer side, a carrier rail at the furniture body side, and a middle rail which runs between the extension and carrier rails at both sides of the drawer. The load between the rails is transmitted by running rollers which are mounted in separate carriages. Mounted in the front region of the carrier rail are at least two stationary support rollers on which the extension rail runs via a running limb so as to support the extended rail at least in the closed condition of the drawer.