Pull-Out Guide Lever Damper for Compact Rail Braking
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Solution Overview
Problem
Existing pull-out guides for furniture parts face challenges with space requirements and durability of damping devices, particularly for higher load capacities, as conventional dampers are bulky and wear out quickly, and existing solutions disrupt the design or increase costs.
Innovation Solution
A pull-out guide incorporating a lever-based stop damper with an elastically bendable second lever arm that acts like a leaf spring, combined with an overload stop device to limit force and prevent excessive bending, allowing for effective damping with minimal space and long-lasting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cylinder or rotary dampers are used for braking the guide rail, then damping function is achieved, but space requirement increases and installation becomes difficult
Solution Approach 1:
The patent replaces conventional cylinder or rotary dampers with a lever-based stop damper mechanism. This new mechanism uses a lever (17) with a first lever arm (18) and a second lever arm (19), where the second lever arm is designed to be elastically bendable. The braking force is applied through a counter-stop element (15) abutting against the stop surface (21) of the first lever arm, while the second lever arm provides elastic deformation to dampen the braking action. This substitution eliminates the need for bulky cylindrical or rotary damper components while achieving the same damping function through elastic deformation of the lever arm.
2Reliability
If rubber stop elements are used for braking, then damping is provided, but wear occurs quickly under higher load capacities
Solution Approach 1:
The patent changes the material parameter and mechanical behavior of the damping element. Instead of using rubber or elastomeric materials that undergo wear through friction, the invention uses a lever mechanism with an elastically bendable second lever arm (19). This lever arm is made from materials with appropriate elastic properties that allow it to deform reversibly under load. The elastic deformation absorbs and dissipates energy without the sliding friction that causes wear in rubber elements, thereby significantly extending the service life under higher load capacities.
3Volume of moving object
If the second lever arm is made elastically bendable for damping, then compact design is achieved, but excessive bending may cause structural failure
Solution Approach 1:
The patent incorporates an overload stop device that acts as a protective mechanism before excessive bending can occur. This device includes a second stop element (23) that can abut against an end stop (24) when the lever (17) is viewed from the side. This pre-positioned stop element limits the maximum pivoting angle of the lever and consequently limits the maximum bending deformation of the second lever arm (19). By providing this beforehand cushioning or limiting mechanism, the patent ensures that the elastically bendable lever arm operates within safe deformation limits and cannot undergo excessive bending that would cause structural failure.
4Strength
If the lever arm is made rigid for strength, then structural integrity is maintained, but damping capability is reduced
Solution Approach 1:
The patent applies the principle of local quality by differentiating the mechanical properties of different parts of the lever mechanism. The first lever arm (18) is designed to be rigid or much less bendable to maintain structural integrity and provide a stable mounting structure. In contrast, the second lever arm (19) is specifically designed to be elastically bendable to provide the damping function through controlled deformation. This local differentiation of mechanical properties allows each part to fulfill its specific function optimally - the first lever arm provides strength and stability, while the second lever arm provides damping capability through elastic deformation.
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 efficient damping with a compact design, suitable for higher load capacities, while maintaining the structural integrity and reducing wear, thus enhancing the durability and functionality of pull-out guides.
Implementation Method 1
The second lever arm is designed to be elastically bendable in such a way that the second lever arm dampens the braking of the second guide rail due to its bending
Implementation Method 2
A counter-stop element is arranged on the other of the two guide rails. The lever has a first lever arm with a stop surface against which the counter-stop element for braking the second guide rail abuts, and a second lever arm with a support surface with which the second lever arm is supported relative to the guide rail on which the lever is pivotally mounted about the pivot axis
Data Source
Figure 1~6
Figure 2~5
Figure 7~9
AI summary
A pull-out guide for a furniture part (1) that can be pulled out of a furniture carcass (2) comprises a first guide rail (3, 4) and a second guide rail (4, 5), which is slidably mounted relative to the first guide rail (3, 4) in and against a displacement direction (6, 7) over a displacement path, wherein the braking of the second guide rail (4, 5) is damped at least at one end of the displacement path by a stop damper (25, 47) against which a counter stop element (24, 48, 60) runs. The stop damper (25, 47) is designed in the form of a lever which is pivotably mounted on the guide rail (3, 4, 5) on which the stop damper (25, 47) is arranged about a pivot axis (26, 49) and which comprises a first lever arm (27, 51) and a second lever arm (28, 55) which is elastically bendable to dampen the deceleration of the second guide rail (4, 5).When a limit value of the pivoting of the first lever arm (27, 51) about the pivot axis (26, 49) is reached, an overload stop device (24, 36; 58, 59; 58, 63) becomes effective, which limits the pivoting of the first lever arm (27, 51) about the pivot axis (26, 49).