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Solution Overview
Problem
Conventional pull-out guides face challenges in achieving a large displacement path with a minimal spring stroke, leading to increased overall length and integration issues, especially for high-load applications where long retraction lengths are required to absorb kinetic energy during furniture part retraction.
Innovation Solution
A pull-out guide with a displacement device featuring a central rail with toothed racks coupled via a gear, where drivers interact with coupling parts on the rails to move the racks into waiting positions, allowing for a significantly shorter spring stroke while achieving a larger displacement path, and incorporating a damper for controlled retraction and extension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional spring-loaded closing device is used to achieve automatic retraction, then the retraction function is provided, but the spring stroke must be very long (about twice the feed path) to ensure sufficient pull-in force over the entire path, leading to increased overall length
Solution Approach 1:
The feed mechanism is divided into two distinct functional sections: a feed section that extends the pull-out furniture part, and a pull-in section that provides automatic retraction. This segmentation allows each section to be optimized independently, with the pull-in section using a compact spring mechanism that only needs to cover a short distance (5-25% of total feed path) rather than the entire feed path, thereby reducing the overall length requirement
Solution Approach 2:
The damper is positioned to act on the pull-out furniture part before the spring-loaded closing device becomes active. The damper reduces the advancing speed and kinetic energy of the furniture part in advance, allowing the subsequent spring mechanism to operate more effectively with a shorter stroke, as it doesn't need to overcome excessive momentum over a long distance
2Force
If a long spring stroke is used to provide sufficient pull-in force over the entire feed path, then the retraction force is adequate, but the overall length of the pull-out guide increases significantly
Solution Approach 1:
The mechanism segments the feed path into a feed section and a pull-in section, concentrating the force-generating spring mechanism only in the pull-in section. This allows the spring to exert adequate pull-in force over a short distance (5-25% of total feed path) rather than distributing the force requirement over the entire feed path, thereby maintaining sufficient retraction force while reducing overall length
Solution Approach 2:
The damper provides continuous damping action throughout the feed section, continuously reducing the kinetic energy and speed of the pull-out furniture part. This continuous pre-conditioning ensures that when the spring mechanism engages in the pull-in section, the furniture part is already moving at a controlled speed, allowing the spring to maintain adequate pull-in force over a shorter distance
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 design enables a larger feed path with a significantly shorter spring stroke, reducing the overall length of the pull-out guide and allowing for efficient self-retraction and self-extension functions, while maintaining effective energy absorption during retraction.
Implementation Method 1
a guide part (16) arranged on the middle rail (3), from which a first and a second toothed rack (17, 18) coupled via at least one gear wheel (19) are guided in a displaceable manner
Implementation Method 2
closing devices (also known as self-closing devices or pull-in mechanisms), which automatically pull in the pull-out furniture part over a final section of the insertion path when the pull-out furniture part is pushed in
Implementation Method 3
closing devices are usually equipped with insertion dampers in order to dampen the retraction movement of the pull-out furniture part in the last section of the retraction path
Data Source
Figure 1~2
Figure 3~4
Figure 5~8
AI summary
A pull-out guide for extending a pull-out furniture component from a furniture carcass comprises a sliding device by which the rails can be automatically moved into the retracted position during the final section of the pull-out guide's retraction. The sliding device has a guide element (16) arranged on the central rail, by which a first and a second rack (17, 18), coupled via at least one gear (19), are slidably guided. A first coupling element (23) is connected to the first rack (17), which interacts with a first driver (27) arranged on the first rail (1), and a second coupling element (24) is connected to the second rack (18), which interacts with a second driver (28) arranged on the second rail (2).