Pull-out guide
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Solution Overview
Problem
Existing pull-out guides for furniture are difficult to operate and require simultaneous adjustment of securing parts on both middle rails, making it challenging for one person to insert or remove a drawer with pull-out guides mounted.
Innovation Solution
A pull-out guide design where the securing part is mounted displaceably on the second rail, allowing it to move from a locking position to a release position over a displacement path that encloses an angle of less than 20° with the opposite direction of the pull-out direction, enabling easy disengagement of the stop element from the pull-out stop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the securing part is rigidly fixed on the second rail, then the structure is simple and stable, but the first rail cannot be completely removed from the second rail
Solution Approach 1:
The securing part is mounted displaceably on the second rail, allowing it to move between a locking position (blocking removal) and a release position (allowing complete removal). This dynamic mounting mechanism resolves the contradiction by enabling both structural stability during normal use and ease of removal when needed.
Solution Approach 2:
The securing part is divided into functional segments: a displacement mechanism allowing movement along the second rail, a locking component that engages with the first rail, and a release component that disengages the lock. This segmentation enables independent control of locking and release functions.
2Reliability
If simultaneous adjustment of securing parts on both middle rails is required, then the locking position is reliably achieved, but the operation becomes difficult for single-person use
Solution Approach 1:
The securing parts on both middle rails are merged into a single displacement operation. When the drawer is pulled out, both securing parts automatically move to their release positions simultaneously, allowing the stop elements to clear the pull-out stops and the drawer to be completely removed. This combining of operations maintains reliability while enabling single-person use.
Solution Approach 2:
The securing parts automatically adjust their positions based on the drawer's movement state. During insertion, they self-adjust to the locking position; during removal, they self-adjust to the release position. This self-service mechanism eliminates the need for manual coordination of multiple securing parts.
3Ease of operation
If the displacement path encloses a large angle with the opposite pull-out direction, then the securing part moves effectively, but the pivotability of the first rail is restricted
Solution Approach 1:
The displacement path is designed with a specific geometric parameter: the angle between the displacement path and the opposite pull-out direction is constrained to less than 20 degrees. This parameter optimization ensures that the securing part moves effectively along the rail while minimizing restriction on the first rail's pivotability, achieving smooth operation.
Data Source
AI summary
A pull-out guide for pulling a pull-out furniture part out of a furniture carcass has a first rail and a second rail, wherein the pulling out of the first rail is limited by a stop element of the first rail striking against a pull-out stop of the second rail. A securing part is mounted movably on the second rail and is adjustable between a release position, in which, for complete removal of the first rail, the first rail is pivotable relative to the second rail to such an extent that the stop element can be disengaged from the pull-out stop, and a locking position. The securing part is mounted displaceably, over a displacement path extending from the locking position to the release position, in a displacement direction that encloses an angle of less than 20° with the direction counter to the pull-out direction.