WO2009156144A1 - Furniture and device for braking a motion of a furniture part that is movable relative to a body by means of attenuation - Google Patents

Abstract

The invention relates to a device (9) for braking a movement of a furniture part relative to a body by means of attenuation, comprising a housing (12) that comprises a displacement space (13) for piston means (10) being guided therein in a displaceable manner, said piston means able to be coupled to a furniture part, wherein an attenuation effect can be achieved in the displacement space (13) by means of the displacement of the piston means (10). According to the invention the device is configured such that when the braking is properly applied a reversal of the movement direction of the braked furniture part does not occur in an overpressure space due to an elastic attenuation portion occurring during braking by avoiding a resilient fluid pad.

Description

"Furniture and device for braking a movement of a relative to a body movable furniture part by damping"

The invention relates to a device according to claim 1 and a furniture according to claim 11.

State of the art:

In the furniture industry different dampers are known with a housed in a damper housing fluid for motion damping of movably received furniture parts. For example, it is possible to work with an air damper in whose damper housing volume ranges are separated by a movable sliding part in the damper housing. During damping, for example when the sliding part is retracted, the pressure is reduced in an increasing volume range and increased in a decreasing volume range. In this process, the movement of the movable furniture part is damped at a predetermined distance. The displacement part and / or the damper housing can be designed so that an overflow of the gas from one volume area to the other is possible to allow a desired damping. Such dampers are comparatively expensive to manufacture. In addition, it can not be ruled out that in regularly occurring operating conditions after the damping process it due to the damper assembly to a Repulsion of the damped furniture part comes.

Object and advantages of the invention:

Object of the present invention is to provide a piece of furniture with improved motion damping of a movable furniture part or a damping device, which is easier to manufacture and more reliable, to provide.

This object is solved by the claims 1 and 11. In the dependent claims advantageous developments of the invention are shown.

The invention relates to a device for braking a movement of a relative to a body movable furniture part by damping, comprising a housing having a sliding space for displaceably guided therein piston means which are coupled to the furniture part, wherein by moving the piston means in the sliding room a damping effect can be achieved. The essence of the invention lies in the fact that the device is designed in such a way that a reversal of the direction of movement of the decelerated furniture part due to an elastic Abbremsanteils during braking operation by avoiding a rebounding fluid cushion in a pressure chamber does not occur during normal use of the rule during deceleration.

In known fluid dampers with a compressible Dämpffluid, in particular a gas such as air, increases during the damping process, the gas pressure in the decreasing volume range in the fluid damper. Because it is compressed by the movement of the piston or displacement means due to the compressibility of the gas, in particular in a comparatively rapid displacement movement of the piston means. Here, the piston means are directly or indirectly connected to the moving or to be damped furniture part or motion coupled.

Under a normal use of the rule are the Usungsvorgänge understand that occur in a conventional use of the furniture, in particular movements of the movable furniture part when used properly. In particular, such arrangements come into consideration, in which a collection device for the movable furniture part is present, wherein the movement of the movable furniture part takes place by damping with the proposed braking device. With a collection device a controlled closing behavior of the movable furniture part is to be made possible or the movable furniture part are brought into a completely closed position relative to the body. The collection device may, for example, function with a recoil spring or gravity operated. A theoretically possible use of previous fluid damper, which does not occur in practice, however, in which the movable furniture part, for. is moved only extremely slow, so to speak slow-motion, is not intended use of the rule according to the invention. For with such a temporally comparatively long delaying process, e.g. in the minute range, it could be possible that there is no rebounding fluid cushion in an overpressure space.

With proper use or proper use of the rule it comes with appropriate known fluid dampers for building a significant for the movement of the furniture part overpressure in a pressure range of the damper, resulting in a recoil of the movable furniture part. Because during the DämpfVorgangs an increasing pressure force by the ever-compressed gas on the volume decreasing pressure side generated, wherein the pressing force acts on the piston means and is directed against the direction of movement of the movable furniture part. If at the end of the movement of the piston means on the one hand this compressive force is greatest and on the other hand, the counteracting force due to the greatly reduced kinetic energy of the movable furniture part drops, then there may be a recoil or a reversal of movement of the piston means or the movable furniture part , which is just as undesirable as the conceivable case that the movable furniture part may not reach its fully closed position and thus presents a potential for injury. In addition, when the movable furniture part is open, the interior of the movable furniture part is more likely to become dirty. In arrangements with a retraction device, for example, with an automatic retraction, which is usually present, it may initially come to a moving forward of the movable furniture part when closing and only then to complete closing of the furniture part, which is also disadvantageous. Under movable furniture parts are in particular Ausschübe, drawers, doors, flaps, trays, revolving doors, rotary carousels and the like to understand.

With the device according to the invention can not occur as described above springback or a so-called "rebound effect" in the rule use.

Advantageously, due to the invention under certain circumstances, overflow sections, for example, longitudinal grooves on an outer side of the piston means, for example a piston displaceable in the damper housing, can be dispensed with. Because by avoiding the build-up of an overpressure on the leading side of the piston and no Überströmmöglichkeit of fluid or gas to the piston means or possibly also to counter sections such as Gehäuseinnenwandungen must be formed. Overall, so that the damper can be produced more economically. It is further proposed that the device is designed such that the damping effect is determined only by a low pressure, in particular substantially constant low pressure in a first increasing volume range of the displacement chamber formed by displacement of the piston means. Although with the damping device according to the invention a previously existing overpressure side is avoided or the DämpfVorgang is not determined by the side in the damper housing, which lies in the direction of movement of the piston means during the damping process before this, so far forms the positive pressure side, but it can now be controlled DämpfVorgang vacuum side , A negative pressure side can be designed in particular as before. The negative pressure side is present in particular on the opposite side of the piston means to the overpressure side, which lies behind the piston means in the direction of movement of the piston means during the damping process. By Entlangbzw. Moving the piston means of solid walls of the negative pressure side, the volume of the negative pressure side is increased, wherein the piston means also form walls of the negative pressure side. When the negative-pressure region is virtually gas-tight to the outside, the gas pressure will decrease with the increase in volume of the low-pressure side. This pressure drop of the gas can form the basis of the braking or damping control.

In this case, it can be arranged that a constant or substantially constant low pressure prevails on the lower or low pressure side of the damping device over the essential movement distance of the piston means during the damping process. It can e.g. smallest openings may be present, via which a small gas flow, ie amount of gas per time, to the negative pressure side is feasible.

It is also advantageous that one on the piston means Existing friction portion by the low pressure in the first volume range is displaceable such that the friction portion comes into frictional contact with a wall portion of the sliding space. A resettable offset of the friction section can take place in various ways, for example, by a translational or other movement away from the piston means and towards the wall portion of the sliding chamber, for example by disengagement, unfolding or inflation. The friction section may be provided in particular on the outside of a main body of the piston means, for example of a rubber-elastic material elastically bulges at low or negative pressure in the first volume range or lifts off the base body and automatically engages again when the low or negative pressure is removed or contracts and, if necessary, applies to the body. In the contracted state, for example, when pushing back the piston means in its starting position, when no more low pressure prevails in the first volume range, the friction section is not or not braking effect with the wall portion of the sliding space eg a housing inner wall in contact. Advantageously, already at the beginning of the displacement of the piston means or after a small displacement from the starting position, for example, about 10 percent of the total displacement, a relatively strong low or negative pressure. With the low pressure, an effect on the friction portion is achieved, so that, for example, a rubber-elastic membrane bulges and is pressed against the Wandungsabschnitt stable and rubs when moving the piston means and the piston means and thus the movable furniture part is slowed down. As a rule, sealing means are provided on the piston means in such a way as to be able to realize the low or low pressure for the damping process separately from the second volume range in the first volume range. Advantageously, the device is configured such that substantially no pressure increase takes place in a second volume range during the braking process. This avoids an effect on the movable furniture part springback or rebound effect. In the arrangement according to the invention, the braking takes place through the friction section from the beginning of the sliding movement of the piston means, which then does not, as is the case with known dampers on a final leg of the sliding movement of the piston means of pressure increase in the second volume range in the housing to bear and the pressure increases so much that the rebound effect is triggered. The causal increase in pressure in the second volume range is not permitted according to the invention.

It is also advantageous that the device is designed to allow only a pressure increase in the second volume range in a predeterminable range of values. For even comparatively small pressure increases in the second volume range, starting from a pressure level before a damping process, which may possibly occur briefly, e.g. in the range of about 0.1 to 0.3 bar, do not affect or not noticeable on the advantageous damping behavior of the proposed damper. Actuators or valves and / or correspondingly configured overflow regions or a passage are conceivable as suitable measures, for example, in order to allow at least one gas flow out of the second volume region when the pressure rises. A flexibly compliant or pressure-increasing and automatically resettable wall of the second volume region is also a possible variant, e.g. in the form of a rubber skin.

The second volume range is formed in the damping device, in particular, where in generic devices, the pressure range is located, but with the main difference of the embodiment of the invention. In contrast, the first volume range can be seen analogous to the negative pressure range of generic damping devices.

In addition, the device is advantageously designed such that during the braking process, the second volume range is at least approximately below ambient pressure, in particular below atmospheric pressure. This can be constructed comparatively simple and uncomplicated on the damper. It only has to be ensured that in the second volume range the ambient pressure can always prevail or atmospheric pressure prevails. In particular, this can be dispensed with corresponding arrangements for the tight enclosure of the second volume range.

It is further proposed that the housing is designed to substantially closely delimit the first volume region to the outside. It can thus be ensured that the first volume region can form a comparatively low pressure to other regions, in particular the second volume region of the damper, due to the movement of the piston means during the damping process. Due to the high tightness of the first volume range in all movement phases of the piston means, this can be securely held in a low pressure region during the movement of the piston means. For example, in the first volume range, a pressure of about 0.1 bar prevail, in the second volume range in particular about 1 bar or atmospheric pressure. The pressure difference is therefore always about 0.9 bar in this case.

Further, it is advantageous that a passage is provided, by means of which an overflow of fluid can take place during the deceleration process between the displacement space and an outer area. This makes it possible to avoid undesired pressure ranges or desired pressure ranges faster and more durable to reach .

In particular, e.g. high pressures in the second volume range can be prevented towards the end of the damping process. The passage is then responsible in particular for the non-pressure increase in the second volume range. In principle, the first volume region can also have an outlet to the outside or it is never absolutely impermeable. In this case, only a very small gas exchange is made possible, so that in the first volume range, a nearly the same low pressure is maintained, in particular at about 0.1 bar and remains during this DämpfVorgangs at this level. However, the opening must not noticeably counteract an initial pressure drop to approximately 0.1 bar.

It is also preferred that the passage is configured to allow outflow of fluid from the second volume region to the outside. Thus, a rapid increase to a relatively high pressure level in the second volume range and an associated springback or rebound effect in the movement damping of the furniture part can be avoided in the second volume range even with a fast or sudden Kolbenmittel- or piston movement. A quick or abrupt piston means or piston movement occurs in particular when the movable furniture part is accelerated vigorously or with a high pulse from an open position in the closing direction. The passage must be designed so that even then a disadvantageous pressure increase in the second volume range can be excluded.

In addition, it is proposed that the device is designed such that the first and the second volume region are separated from one another by the piston means from each other at least almost gas-tight. This can be achieved in the second volume range, a nearly constant pressure level, whereas in the first volume range after Outside tight completion, that is also possible with respect to the second volume range. In this way, different pressure ranges can be reliably achieved in the first and second volume regions and this pressure difference maintained.

The invention also relates to a piece of furniture having a furniture part movable relative to a fixed body, the furniture having one of the above-mentioned devices. Thus, the furniture with a furniture body and, for. a movable door or revolving door, flap, drawer, a Ausschub, tray or rotary carousel advantageously designed.

Description of the figures:

In the figures, which are shown in highly schematic form, fluid dampers according to the prior art and fluid dampers according to the invention are explained.

In detail shows:

FIG. 1 and FIG. 2 show a known damper shown in greatly simplified form with a housing and a piston displaceable therein with a piston rod cut in two different states,

FIG. 3 and FIG. 4 show a likewise greatly simplified damping device according to the invention cut in two different states,

Figure 5 to Figure 8 shows another known greatly simplistic shown damper with housing and a piston displaceable therein Piston rod cut in different states and

Figure 9 is another inventive

Damping device shown cut.

In Figure 1 and Figure 2 is a highly schematically illustrated known air or fluid damper 1 is shown in section, which is designed as a piston-cylinder unit and which comprises a cylindrical damper housing 2, in which slidably guided a piston 3 back and forth. The particular roller-shaped piston 3 slides during movement in the damper housing 2 with its peripheral outer side 6 or portions thereof on an inner wall of the damper housing 2. On the piston 3 is centrally fixed to the roller longitudinal axis a piston rod 4, which through an opening 5 in a frontal part the damper housing 2 is guided to the outside. The opening 5 is configured tuned to the outside of the piston rod 4. Coupled with the movement of the piston rod 4 is the movement of the movable furniture part (not shown).

A damper fluid is housed in a housing interior 8 and may for example be air or another gas mixture or a clean gas.

The outer side 6 of the piston 3 has here longitudinal grooves 7 (lying in the cutting plane) with a comparatively small groove depth. The piston 3 separates a first volume region 8a or negative pressure region from a second volume region 8b or overpressure region of the housing interior 8. During the forward movement of the piston 3 in the damper housing 2 from the almost completely retracted position shown in FIG. 1 to the widely retracted position shown in FIG Position in the damper housing 2, that is, during the DämpfVorgang, so while a gas in the volume range 8b gas is compressed, but it can be done a certain slight overflow of the gas from the pressure side 8b to the negative pressure side 8a.

Figure 3 and Figure 4 show an air damper 9 according to the invention in the corresponding to Figures 1 and 2 positions. The air damper 9 comprises a piston 10 with piston rod 11, wherein the piston 10 can be pushed or pushed in a housing 12. As an essential difference to the fluid damper according to FIGS. 1 and 2, the housing 12 has an end opening 14, which has a second volume area 13b of a housing interior 13 opens to the outside. A first volume region 13b of the housing interior 13 is designed in accordance with the arrangement shown in FIGS. 1 and 2.

In the damping process with the displacement of the piston 10 from the position shown in Figure 3 to the position shown in Figure 4 can be through the opening 14, even with a possibly very fast displacement of the piston 10 in the housing 12 in the direction of the opening 14 no increased pressure in the second Build volume range 13b, whereby a recoil effect on the piston 10 and thus on the relevant furniture part coupled thereto is avoided. Because it can enter a sufficiently large amount or sufficiently fast air from the second volume range 13b to the outside. At the same time, in the first volume region 13a, a nearly constant negative pressure of e.g. about 0.1 bar received. In the second volume region 13b, the same pressure prevails as outside the housing 12, that is, as a rule, ambient or atmospheric pressure.

A known fluid damper 15 is shown in FIGS. 5 to 8, wherein FIG. 5 shows a starting situation before a damping process with the fluid damper 15. In one to Example hollow cylindrical housing 16 of the fluid damper 15 is a piston 17 with attached thereto piston rod 18 slidably. On the piston 17 is outside, for example, circumferentially circumferentially formed a piston sleeve 19 is present, which consists in particular of an elastic, such as rubber-elastic material. The piston sleeve 19 is fixed to the piston such that, depending on the pressure applied on the outside or inside of the piston sleeve 19, the piston sleeve 19 assumes a corresponding shape, for example inflates outward or bulges or is pressed in the direction of the piston 17.

The housing 16 is formed at least substantially closed in a fluid-tight manner to the outside, wherein the piston rod 18 is mounted via an opening 31 and passes outwardly from the interior of the housing 16. Coupled or coupled to the piston rod 18 is a movable furniture part (not shown) which can be brought into a closed position via an automatic retraction mechanism.

Before the piston movement for damping the last partial path of the Möbelteileinschiebung (Figure 5) prevails in particular a balanced pressure ratio in the interior of the housing 16, wherein the piston sleeve 19 rests against the piston 17 and in particular is not in frictional contact with an inner wall 16a of the housing 16. In the interior of the housing 16 or on both sides of the piston 17, for example, there is a pressure of one bar or atmospheric pressure.

Figure 6 to Figure 8 respectively shows the fluid damper 15 with the housing 16 differently far during the braking process of the movable furniture part inserted piston 17, wherein Figure 6 indicates the state shortly after the start of the sliding movement, which corresponds to the last leg of Einschiebbewegung the movable furniture part. In FIG. 6, the piston 17 is only slightly inserted into the housing 16 with respect to the position according to FIG. 5, for example by a few millimeters. This results in a rear in the direction of movement of the piston 17 volume range 20 in the housing 16 is already a low or negative pressure pl of, for example, 0.9 bar. This is achieved by the volume area 20 is tightly separated by a lying in the direction of movement of the piston 17 in front of the piston 17 volume area 21 by highly schematically illustrated sealing means 22 on the piston 17. In the volume range 20 falls by further displacement of the piston 17 in the direction of movement as shown in Figure 7 and 8, the pressure of 0.9 bar only to a pressure p2 of eg about 0.85 bar according to Figure 7 and Figure 8.

In the simultaneously decreasing volume region 21 in front of the piston 17, in the state according to FIG. 6 and FIG. 7, the pressure will remain virtually the same or rise only minimally above approximately 1 bar. Only in the last section of the insertion path according to FIG. 8, in the volume region 21, will there be a strong increase in pressure to, for example, more than 4 bar. As a result, in the known fluid damper according to FIGS. 6 to 8, a rebound effect is triggered in the insertion position according to FIG. 8 shortly before reaching a completely closed position of the movable furniture part. As a result, the movable furniture part is briefly moved forward against the direction of insertion movement and only then pulled back opposite by, for example, an automatic retraction in the fully closed position. This sub-process with reversal of motion is undesirable.

The braking effect of the movable furniture part in the movement of the piston 17 in the housing 16 is effected according to Figure 6 to Figure 8 by friction between the outwardly curved piston seal 19 on the inner wall 16a of the housing 16th Due to the low pressure pl of about 0.9 bar in the volume range 20, the piston sleeve 19 is bulged outwardly and pressed against the inner wall 16a, so that the braking operation begins immediately after the beginning of Einschiebbewegung the piston 17 into the housing 16.

FIG. 9 shows a fluid damper 23 according to the invention with a frontally open housing 24, a piston 25 displaceable therein with piston rod and piston sleeve 26 and sealing means 27. The opening 28, which must be dimensioned sufficiently large, can be located on the last stretch of section Insertion movement of the piston 25 in a leading volume region 29 form no or no impacting overpressure, whereby a rebound effect is avoided. In the rearward volume region 30 in the housing 24, however, as in the case of the fluid damper 15 according to FIGS. 5 to 8, a negative pressure is realized immediately after the beginning of an insertion movement of the piston 25 in the housing 24 and thus the bulging of the piston sleeve 26 is achieved, as a result of which the decelerating or damping effect of the piston 26 is achieved Fluid damper 23 remains effective effective.

LIST OF REFERENCE NUMBERS

1 fluid damper

2 damper housings

3 pistons

4 piston rod

5 opening

6 outside

7 longitudinal grooves

8 housing interior

8a volume range

8b volume range

9 air dampers

10 pistons

11 piston rod

12 housing

13 housing interior

13a volume range

13b volume range

14 opening

15 fluid dampers

16 housing

16a inner wall

17 pistons

18 piston rod

19 piston cuff

20 volume range

21 volume range

22 sealant

23 fluid damper

24 housing

25 pistons

26 Piston sleeve

27 sealant

28 opening Volume range Volume range opening

Claims

Claims: Anspruch [en] A device for braking a movement of a furniture part movable relative to a body by means of damping, comprising a housing (12) which comprises a sliding space (13) for displaceably guided piston means (10) which can be coupled to the furniture part, wherein Moving the piston means (10) in the sliding chamber (13) a damping effect can be achieved, characterized in that the device is designed such that at normal use of the control during braking a reversal of the direction of movement of the decelerated furniture part due to a braking during the process resulting elastic Abbremsanteils by avoiding a rebounding fluid cushion does not occur in a pressure chamber. 2. Apparatus according to claim 1, characterized in that the device is designed so that the damping effect only by a low pressure, in particular substantially constant low pressure, in a by the displacement of the piston means (10) formed first increasing volume range (13 a) of the Displacement chamber (13) is determined. 3. Apparatus according to claim 1 or 2, characterized in that an existing on the piston means friction portion by the low pressure in the first volume range is displaceable such that the friction portion comes into frictional contact with a wall portion of the sliding space. 4. Apparatus according to claim 1 or 2, characterized in that the device is designed so that during deceleration substantially no pressure increase in a second volume range (13b) takes place. 5. Device according to one of the preceding claims, characterized in that the device is designed to allow only a pressure increase in the second volume range (13b) in a predeterminable value range. 6. Device according to one of the preceding claims, characterized in that the device is designed such that during the braking process, the second volume region (13b) is at least approximately under ambient pressure, in particular under atmospheric pressure. 7. Device according to one of the preceding claims, characterized in that the housing (12) is formed, the first volume region (13a) to define the outside substantially dense. 8. Device according to one of the preceding claims, characterized in that a passage (14) is present, by means of which an overflow of fluid can take place during the braking process between the displacement chamber (13) and an outer region. 9. Device according to one of the preceding claims, characterized in that the passage (14) is designed to allow an overflow of fluid from the second volume region (13b) to the outside. 10. Device according to one of the preceding claims, characterized in that the device is designed such that the first (13a) and the second volume region (13b) by the piston means (10) are separated from each other at least almost gas-tight. 11. Furniture with a relative to a fixed body movable furniture part, wherein the furniture comprises a device according to one of the preceding claims.