Drawer Pull-Out Guide With Central Roller Support
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Solution Overview
Problem
Existing drawer extension guides have a bulky structure due to laterally mounted supporting rollers, which cause lateral tilting moments and twisting, and require a bent-over portion on the drawer rail for support, leading to inefficiencies in drawer movement and aesthetics.
Innovation Solution
A central arrangement of the supporting roller between the side limb of the drawer rail and the carcass rail reduces the overall width and eliminates the need for a bent-over portion, allowing direct contact with the running limbs and preventing carriage jamming, thus enhancing the compactness and vertical loading of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the supporting roller is mounted laterally on the drawer rail, then the drawer rail can be supported on the supporting roller, but the structure becomes bulky and lateral tilting moments are exerted on the carriages
Solution Approach 1:
The supporting roller is inverted from a lateral mounting position to a central mounting position between the carcass rail and drawer rail. This inversion eliminates the bent-over portion requirement, reduces the guide width, and prevents lateral tilting moments on the carriages while maintaining the support function.
Solution Approach 2:
The supporting roller is repositioned from a lateral arrangement to a central arrangement in the longitudinal direction of the rails. This dimensional repositioning allows the roller to cooperate directly with the running limbs of both rails, eliminating the need for lateral support structures and reducing overall guide width.
2Reliability
If a bent-over portion is provided on the drawer rail for support, then the drawer rail can be supported on the supporting roller, but the drawer rail structure becomes more complex and twisting is caused
Solution Approach 1:
The bent-over portion is extracted and eliminated from the drawer rail structure. The supporting roller is repositioned to cooperate directly with the running limbs of the rails, removing the unnecessary bent-over portion and its associated complexity and twisting issues.
3Reliability
If the supporting roller is mounted laterally, then the drawer can be supported, but the space between the side limb and carcass rail increases the overall width
Solution Approach 1:
The supporting roller position is inverted from lateral to central, moving it into the narrow intermediate region between the rails. This reduces the space between the side limb and carcass rail, minimizing the overall guide width while maintaining support functionality.
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 results in a more compact drawer extension guide with improved travel movement and reduced risk of jamming, maintaining a constant gap width between drawers for an aesthetically pleasing appearance.
Implementation Method 1
a bearing having at least one supporting roller, by way of which the drawer rail is supported in the closed condition on the carcass rail
Implementation Method 2
the supporting roller provides that the drawer is slightly lifted in the closed condition so that unwanted downward movement of the drawer is prevented
Implementation Method 3
preventing carriage jamming, thus enhancing the compactness and vertical loading of the system
Data Source
AI summary
A drawer pull-out guide includes a body rail which can be mounted on a furniture body via a fastening section, and a drawer rail which can be fastened on a drawer and is mounted movably relative to the body rail. The drawer rail has a side web facing the fastening section. A central rail is mounted movably between the body rail and the drawer rail, and a bearing with at least one supporting roller via which the drawer rail is supported in the closed state is on the body rail. The bearing is arranged at a front end region of the central rail or of the drawer rail so as to be non-displaceable during operation in the longitudinal direction of the rail on which the bearing is arranged. The side web of the drawer rail is arranged between the supporting roller and the fastening section of the body rail.