WO2009141307A1

WO2009141307A1 - Damping device

Info

Publication number: WO2009141307A1
Application number: PCT/EP2009/056002
Authority: WO
Inventors: Peter Jährling; Thorsten HÖTGER
Original assignee: Druck- und Spritzgußwerk Hettich GmbH & Co. KG
Priority date: 2008-05-19
Filing date: 2009-05-18
Publication date: 2009-11-26
Also published as: DE202008006752U1; EP2288820A1; RU2010151514A; CN102027261B; RU2500935C2; CN102027261A

Abstract

Damping device (3) for damping impact noises during closing of furniture pull-out parts mounted in pull-out guides (1), wherein the damping device (3) comprises an enclosed container (4) made of a flexible material and filled with a fluid or gaseous medium, said container subdivided into a first and a second chamber (6, 7) by way of a narrowing in the cross section, wherein the volume of the first chamber (6) can be made smaller in the direction of motion of a furniture pull-out guide by way of a piston (10) or the like that can be pressed onto the container (4) from the outside, and wherein the second chamber (7) can freely expand under the buildup of restoring forces at the chamber shell (7a).

Description

attenuator

The present invention relates to a damping device for damping of

Noise when closing furniture pull-out parts mounted on drawer guides.

Damping devices for damping of impact noise when closing mounted on drawer guides furniture drawer parts are known per se.

The known damping devices are ultimately based on a piston-cylinder construction, which has the disadvantage that these damping devices are very susceptible to leaks, especially after a long time due to the required seal between the piston rod and cylinder

Running times or under extreme temperature and environmental conditions.

In this case, escaping damping fluid can lead to loss of function and, moreover, also to contamination of the environment of the damping system.

Since corresponding damping devices are frequently combined with so-called self-closing devices whose function is generally known to the person skilled in the art and which therefore need not be explained in detail here, the known damping devices with their inevitably occurring high friction forces constitute a considerable interference variable in the self-closing damping device functional system. which may even lead to unfavorable circumstances that the self-closing is no longer able to reliably close a furniture drawer part. Therefore, in practice, this disturbance is often compensated by an increased spring force in the self-closing, which then in turn affects the comfort of operation.

The present invention has for its object to provide a damping device of the generic type, not the aforementioned disadvantages has and that works without interference and in particular also largely without the occurrence of disturbing frictional forces during operation.

This object is achieved in that the Dämpfungseinrich- device consists of a self-contained, consisting of a flexible material and filled with a fluid or a gaseous medium container, which is divided by a cross-sectional constriction in a first and in a second chamber in which the first chamber can be reduced in volume by a piston which can be pressed onto the container from outside onto the container or the like in the displacement direction of a furniture drawer guide, and the second chamber is underfloor

Structure of restoring forces of the chamber shell can expand freely.

The present invention offers a number of advantages.

Thus, due to the fact that the container is completely closed in itself, no wear-related leaks occur. Likewise, hard-to-control frictional forces on seals or collars, such as those found in piston-cylinder units, are irrelevant. The fluid in the container or gaseous medium must take no lubrication tasks.

Thus, for example, it is conceivable to use an inexpensive liquid with a viscosity that is almost constant over a wide temperature range, that is, water can be used here as the fluid. The advantage that can be achieved would be a constant attenuation characteristic over a wide temperature range.

The damping effect is generated in the damping device according to the invention by the piston, which acts from the outside on the first chamber of the container. Since this chamber can only be reduced in volume, the fluid or gaseous medium in the interior of the container is forced through the cross-sectional constriction into the second chamber, which can be enlarged in terms of volume. The damping effect itself is essentially due to the flow resistance in the area of the cross-sectional constriction. If this damping device is relieved again, the fluid or the gaseous medium is conveyed back into the first chamber by the elasticity of the enlarged in its volume second chamber.

A particularly simple construction of the invention provides that the cross-sectional constriction is formed by a ring surrounding the container with a constant diameter.

However, it is also advantageously conceivable to make the cross-sectional constriction variable by means of an adjustable throttle, for example via an adjusting screw. Thus, the damping effect can be varied.

It is even conceivable to mechanically couple an adjustable throttle with a furniture extracting part such that an adjustment of the damping effect by increasing the throttle cross section as a function of the loading state of the furniture extracting part.

An embodiment of the invention is illustrated in the accompanying drawings and will be described in more detail below.

Show it:

1 shows a furniture drawer guide with a self-closing device and a damping device according to the invention

characters

FIGS. 2 to 4 schematically show sectional views through a damping device according to the invention in different operating states.

In FIG. 1, reference numeral 1 denotes a pull-out guide for a furniture pull-out part, which is equipped in a manner known per se with a self-closing device 2 and a damping device 3. Figures 2 to 4 show a highly schematic representation of the structure and operation of the damping device. 3

As these Figures 2 to 4 reveals, the damping device 3 consists essentially of a self-contained and made of a flexible material and filled with a fluid or a gaseous medium container 4, which in the illustrated embodiment by a cross-sectional constriction in the form of a throttle. 5 is divided into a first chamber 6 and a second chamber 7.

The throttle 6 can be adjusted by an adjusting screw 8 in its effective cross-section.

The first chamber 6 is arranged within a cladding tube 9 and acted upon by a piston 10 which can be inserted into this cladding tube 9 from the outside. It shows

Figure 2 shows the impact of the piston 10 on the first chamber 6, while Figure 3 shows that the piston 10 is retracted over a certain distance away in the cladding tube 9, while the volume of the first chamber 6 has been reduced, since the cladding tube 9 an extension of the first chamber 6 prevented. As a result of this compression of the first chamber 6, a fluid or a gaseous medium arranged in the container 4 is conveyed out of the first chamber 6 via the throttle 5 into the second chamber 7, which can expand in terms of volume. Consequently, we increase the volume of the second chamber 6 by the introduced fluid or gaseous medium, at the same time in the chamber shell 7a rear restoring forces R (see Figure 4) build. This process causes a damping of the piston 10 ultimately coupled to the pullout guide 1. Figure 1 shows in the section shown cut the piston rod 10a of the piston 10 of the damping device 3. The damping occurs when closing or when retracting the pullout guide 1 a. If, in contrast to this retraction direction, which is shown in FIGS. 2 and 3, a furniture extracting part moves back into the opening position, the piston 10 moves away from the first chamber 6, so that due to the restoring forces in the chamber casing 7a of the second chamber 7, the therein fluid or medium again to a large extent via the throttle 5 zurückbe- can be promoted in the first chamber 6 so that they can resume their original size of Figure 2.

An accelerated backflow of the medium or fluid can be promoted, for example, by the fact that the two chambers 7 and 6, bypassing the

Throttle 5, for example via a check valve, are coupled.

It can be seen that the damping device 3 has virtually no friction causing components, which could have a negative effect on the damping effect. It is also clear that the damping device 3 has no relatively movable components that would require lubrication. Thus, for example, water can be used within the container 4 as fluid, which on the one hand represents an inexpensive solution and on the other hand leads to the advantage of a viscosity which is almost constant over a wide temperature range. This results in a virtually constant attenuation characteristic over a wide temperature range.

In the illustrated embodiment, as already mentioned, the damping device is part of an even a self-closing device-containing assembly.

It should be expressly understood that the damping device 3 but does not have to be part of a Selbsteinzuges, but also completely independently on the rail system of an executive statement 1 can act.

Finally, a significant advantage of the damping device 3 according to the invention is that the practically seal-free damping device 3 can also be used in applications in which high temperatures and / or aggressive environmental influences play a role, such as in a dishwasher.

Claims

claims

1. damping device (3) for damping of impact noise when

Closing furniture pull-out parts mounted on pull-out guides (1), characterized in that the damping device (3) consists of a self-contained container (4) made of a flexible material and filled with a fluid or gaseous medium Cross-sectional constriction in a first and a second chamber (6, 7) is divided, the first chamber (6) by a from the outside on the container (4) aufpressbaren piston (10) or the like in the direction of displacement of a furniture drawer guide in volume reducible is and the second chamber (7) can expand freely under construction of restoring forces of the chamber casing (7a).

2, damping device according to claim 1, characterized in that the first chamber (6) by a cladding tube (9) is surrounded, in which also the piston (10) is immersed.

3. Damping device according to claim 1 or 2, characterized in that the cross-sectional constriction is formed by a diameter invariable ring.

4. damping device according to claim 1 or 2, characterized in that the cross-sectional constriction is formed by a throttle (5).

5. Damping device according to claim 4, characterized in that the

Throttle cross section is adjustable via an adjusting screw (8).

6. Damping device according to claim 5, characterized in that the adjusting screw (8) of the throttle (5) is mechanically coupled in such a way with a furniture extracting part that the cross section of the throttle (5) is variable depending on the loading state of the furniture extracting part. Damping device according to one of the preceding claims, characterized in that the chambers (6, 7), bypassing the cross-sectional constriction by a check valve are interconnected so that via this check valve, a fluid or gaseous medium from the chamber (7) into the chamber (6 ) can flow back.