Drawer Pull-Out Guide With Spring-Loaded Holder for Tolerance Fit
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Solution Overview
Problem
Existing pull-out guides for drawers face challenges in assembly complexity due to manufacturing tolerances, which can lead to deformation or failure under tilting moments, and struggle with length and depth adjustments, resulting in incomplete engagement and potential play.
Innovation Solution
A pull-out guide with a slidable holder pretensioned by an energy storage device, allowing for compensation of manufacturing tolerances and enabling depth and height adjustments, ensuring secure engagement and easy assembly by feeling the correct engagement during assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigid catch hook is fixed to the running rail, then the drawer can be secured to the runner, but manufacturing tolerances cause incomplete engagement and the catch hook may deform or fail under tilting moments
Solution Approach 1:
The holder is made displaceable in the longitudinal direction of the running rail, transforming from a rigid fixed connection to a dynamic adjustable connection. This allows the holder to move and adapt to manufacturing tolerances, ensuring complete engagement while maintaining structural integrity under load.
Solution Approach 2:
The position of the holder along the longitudinal axis is changed to compensate for manufacturing tolerances. By allowing the holder to be positioned at different locations, the system adapts to variations in component dimensions without requiring complex assembly procedures or risking engagement failure.
2Ease of manufacture
If the holder is displaceably mounted to compensate for tolerances, then assembly is simplified and tolerances are compensated, but additional adjustment mechanisms are required
Solution Approach 1:
The fastening device is divided into separate functional components: the holder, the running rail, and the energy store. This segmentation allows each component to be optimized independently and simplifies assembly, as the holder can be independently positioned and adjusted without affecting other components.
Solution Approach 2:
The energy store automatically performs the function of securing the holder in position after displacement. The elastic element self-activates to maintain the holder's position once adjusted, eliminating the need for additional locking mechanisms or complex adjustment devices.
3Manufacturing precision
If the holder is pressed against the rear wall by the energy store, then manufacturing tolerances are compensated and engagement is complete, but the holder must be displaceable
Solution Approach 1:
The holder transitions from a static fixed position to a dynamic displaceable position, enabling it to accommodate manufacturing tolerances. The displaceable mounting allows the holder to be positioned precisely where needed while maintaining the ability to absorb dimensional variations.
Solution Approach 2:
The energy store is pre-loaded to create a cushioning force that compensates for manufacturing tolerances before engagement occurs. This beforehand cushioning ensures that the holder is always pressed with sufficient force against the rear wall to guarantee complete engagement, regardless of dimensional variations.
4Device complexity
If the catch hook is rigidly fixed, then the structure is simple, but the catch hook may only engage with a small portion of its length leading to deformation
Solution Approach 1:
The holder is made displaceable to ensure optimal engagement length. By allowing movement in the longitudinal direction, the holder can be positioned to maximize the engagement portion, thereby increasing strength without requiring a more complex rigid structure with multiple adjustment mechanisms.
Solution Approach 2:
The position parameter of the holder is made variable to optimize engagement. By changing the longitudinal position of the holder, the system ensures maximum engagement length is achieved, thereby increasing the strength and load-bearing capacity of the connection.
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 provides a stable and play-free engagement of the drawer with the running rail, ensuring that the holder is always pressed against the rear wall, minimizing bending moments and allowing for easy adjustment and assembly without tools, with the holder being adjustable in both depth and height.
Implementation Method 1
the holder being pretensioned by an energy store forward in the longitudinal direction of the pull-out guide
Implementation Method 2
the holder is pushed against the force of the force accumulator to the rear of a piece of furniture
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
The invention relates to a pull-out guide (8) for a drawer (1), comprising a guide rail (9) which can be fixed to a body and a running rail (10) which is movably mounted. At least one central rail (11) can optionally be provided between the guide rail (9) and the running rail (10), and a securing device (20) with a holder (21) is provided on the running rail (10), wherein a drawer (1) can be fixed to the holder. The holder (21) is mounted in a movable manner in the longitudinal direction of the running rail (10) and is pretensioned towards the front in the pull-out direction by means of an energy accumulator (28). In this manner, a drawer can be easily mounted on the securing device, and manufacturing tolerances can be compensated.