DE102008029775A1 - Furniture and device for braking a movement of a relative to a body movable furniture part by damping - Google Patents

Abstract

A device (9) for braking a movement of a furniture part movable relative to a body by damping is proposed, comprising a housing (12) which comprises a sliding space (13) for displaceably guided piston means (10) which can be coupled to the furniture part are, by the displacement of the piston means (10) in the sliding space (13), a damping effect can be achieved. According to the invention, the device is designed in such a way that during normal use of the control during deceleration, a reversal of the direction of movement of the decelerated furniture part does not occur due to an elastic deceleration component during deceleration by avoiding a resilient fluid cushion in a pressure chamber.

Description

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

State of the art:

In the furniture industry are for motion damping of movably received furniture parts different dampers with a housed in a damper housing Fluid known. For example, you can work with an air damper be in whose damper housing volume ranges by a movable in the damper housing sliding part are separated. At the damping z. B. under retraction of the sliding part is in a magnifying Volume range of pressure is lowered and in a decreasing Increased volume range. In this process, the movement of the movable furniture part Steamed on a predetermined route. The sliding part and / or the damper housing can so be designed that an overflow of the Gas from one volume range in the other is possible to achieve a desired damping enable. Such dampers are comparatively expensive to manufacture. Furthermore can not be ruled out that in regularly occurring operating conditions after steaming it due to the damper arrangement to a repulsion of the muted furniture component comes.

Object and advantages of the invention:

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

These Task is by the claims 1 and 11 solved. In the dependent claims Advantageous developments of the invention are shown.

The The invention is based on a device for braking a movement a relative to a body movable furniture part by damping, comprising a housing, the one sliding room for slidably guided in it Includes piston means which are coupled to the furniture part, wherein the displacement of the piston means in the displacement chamber has a damping effect is achievable. The essence of the invention is that the device is such is designed that when used according to regulations during braking a reversal of the direction of movement of the braked furniture part due to an elastic deceleration component during deceleration by avoiding a spring-back Fluid cushion in a pressure chamber does not occur.

at known fluid dampers with a compressible damping fluid, 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 This is due to the movement of the piston or displacement means because of the compressibility the gas of this compressed, especially with a comparatively fast displacement movement the piston means. The piston means are direct or indirect connected to the moving or to be damped furniture part or motion coupled.

Under a normal use of the rule are the usage operations to understand which one at a usual Use of the furniture occur, 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 exists, with the movement of the movable furniture part by damping takes place with the proposed braking device. With a collection device should have a controlled closing behavior of the movable furniture part allows be or the movable furniture part be brought into a completely closed position relative to the carcass. The collection device can, for example, with a collection spring or gravity-actuated function. A theoretically possible use of previous ones Fluid damper However, which does not occur in practice, in which the movable furniture part z. B. is moved only extremely slowly, so to speak slow-motion, is not intended use of the rule in the sense of the invention. Because at such a time then comparatively long drifting damping process z. In the minute range, could it possible be that it's not springing back Fluid cushion in a pressure chamber comes.

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 damping process an increasing pressure force is generated by the ever-compressed gas on the volume decreasing pressure side, the pressure force acting 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 pressure 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 it can a recoil or a reversal of movement of the piston means or the movable furniture part come, which is just as undesirable, as the conceivable case that the movable furniture part may not reach its fully closed position and thus constitutes an injury potential. 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 feeder z. B. 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 a as described above springback or a so-called "rebound effect" in the Rule usage does not occur.

advantageously, may due to the invention under circumstances to overflow z. B. longitudinal grooves on an outside the piston means z. B. a displaceable in the damper housing piston be waived. Because by avoiding the build up of overpressure on the leading side of the piston must also no Überströmmöglichkeit of fluid or gas at the piston means or possibly also at opposite portions such as B. Gehäuseinnenwandungen be formed. Overall, so that the damper made more economical become.

Further It is proposed that the device is designed so that the damping effect only by a low pressure, in particular substantially constant Low pressure in a formed by the displacement of the piston means first increasing Volume range of the displacement chamber is determined. With the damping device according to the invention Although a previously existing pressure side is avoided or becomes the steaming process not determined from the side in the damper housing, which in the direction of movement of the piston means during the damping process before this lies, so far forms the pressure side, it can but the steaming process now be controlled on the vacuum side. A negative pressure side can especially designed as before. The vacuum side is especially on the overpressure side opposite Side of the piston means present, in the direction of movement of the piston means during steaming lies behind the piston means. By moving along or away 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. At outward almost gastight separation of the negative pressure area is with the increase in volume of Vacuum side there drop the gas pressure. This pressure drop of the Gases can form the basis of the braking or damping control.

there It can be established that a consistent or substantially constant low pressure on the low or low pressure side the damping device on the significant movement distance of the piston means during the damping process prevails. It can z. B. smallest openings available be over which a small gas flow, so gas amount per time, to the negative pressure side towards realizable.

It is moreover advantageous in that a friction section provided on the piston means be offset by the low pressure in the first volume range so is that the friction portion with a wall portion of the sliding space comes in frictional contact. A recoverable Offset of the friction section can in different ways done, z. B. by a translational or other movement away from the piston means and towards the wall portion of the sliding room, z. B. by disengagement, Open or swell. Of the Friction portion may in particular on the outside of a main body of the Be provided piston means, for. B. of a rubber-elastic material which is elastic at low or low pressure in the first volume range bulges or from the main body lifts off and automatically when the low or negative pressure is removed engages or contracts and possibly applies to the body. In the contracted state, for example when pushed back the piston means in its starting position when no more low pressure prevails in the first volume range, the friction section does not come or not braking effect with the wall portion of the sliding room z. B. a housing inner wall in contact. Advantageously, it is already right at the beginning the displacement of the piston means or after a small displacement from the starting position, from z. B. about 10 percent of the total displacement, a relatively strong low or low pressure. With the low pressure an effect is achieved on the friction section, so that, for example a rubber-elastic membrane bulges and stable against the wall section pressed is and when moving the piston means rubs it and the piston means and thus also the movable furniture part is slowed down. As a rule, sealants are on the piston means provided so as to be separated from the second volume area in the first Volume range to be able to realize the low or negative pressure for the damping process.

Advantageously, the device is out staltet that during deceleration substantially no pressure increase takes place in a second volume range. 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 last 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 formed, only a pressure increase in the second Allow volume range in a predefinable value range. Because also comparatively low pressure increases in the second volume range, starting from a pressure level before a steaming process, possibly for a short time can occur, for. B. in the range of about 0.1 to 0.3 bar, do not affect or not noticeable on the advantageous damping behavior the proposed damper out. As appropriate measures For example, actuators or valves and / or accordingly designed overflow areas or a passage conceivable to at least one at pressure increase Allow gas flow out of the second volume range. Also a flexibly resilient or expandable with pressure increase and automatically resettable wall the second volume range is a possible variant, for. B. in shape a rubber skin.

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

Besides that is the device advantageously designed such that when Deceleration of the second volume range at least approximately below Ambient pressure is, in particular under atmospheric pressure. This can comparatively over the damper simple and straightforward. It just has to be ensured that the ambient pressure always prevails in the second volume range can or atmospheric pressure prevails. In particular, it can be used on appropriate arrangements for the tight enclosure of the second volume range are dispensed with.

Further it is suggested that the housing is formed, the first volume area to the outside substantially dense. This can be made sure that the first Volume range by the movement of the piston means during the damping process a comparatively low pressure to other areas, in particular the second volume range of the damper, can train. Due to the high density of the first volume range In all phases of movement of the piston means this can safely in a low pressure area during the movement of the piston means are kept. 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 in this case therefore always about 0.9 bar.

Further it is advantageous that a passage is provided by means of during the braking process between the sliding room and an outdoor area an overflow of Fluid can take place. This can be avoided unwanted pressure ranges or desired Achieve pressure ranges faster and more permanently.

Especially can z. B. towards the end of the damping process high pressures be prevented in the second volume range. The passage is then particular for the Non-pressure increase in the second volume range responsible. Basically, too the first volume region has or has an outlet to the outside never absolutely tight. Only a very small gas exchange is possible, so that in the first volume range almost a same low pressure is maintained, in particular at about 0.1 bar and during the damping process stays at this level. The opening must not be one initial Noticeably counteract pressure drop to approx. 0.1 bar.

It is also prefers that the passage is configured, an overflow of Allow fluid from the second volume range to the outside. This can be done in the second Volume range even with a fast or sudden piston agent or Piston movement a rapid increase to a relatively high pressure level in the second volume range and an associated springback or rebound effect in the motion damping of the furniture part be avoided. A fast or abrupt piston center or piston movement occurs in particular when the movable furniture part strongly or with a high pulse from an open position in the closing direction is accelerated. The passage must be designed so that even then an adverse pressure increase can be excluded in the second volume range.

In addition, it is proposed that the device is designed such that the first and the second volume region is separated from one another by the piston means from each other at least almost gas-tight. Thus, in the second volume range, an almost constant pressure level can be achieved, whereas in the first volume range, an externally sealed closure, that is also with respect to the second volume range, is possible. 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 a piece of furniture a movable relative to a fixed body furniture part, the furniture having one of the above devices. This can be the Furniture with a furniture body and Z. B. a movable door or revolving door, Flap, drawer, a Ausschub, tray or rotary carousel advantageous embellish.

Brief Description:

In the heavily schematized figures are fluid damper after the prior art and inventive fluid damper explained.

in the Individual shows:

1 and 2 a known highly simplified shown damper with housing and a piston displaceable therein with piston rod cut in two different states,

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

5 to 8th another well-known greatly simplified shown damper with housing and a piston displaceable therein with piston rod cut in different states and

9 a further damping device according to the invention shown cut.

In 1 and 2 is a highly schematic illustrated known air or fluid damper 1 shown in section, which is designed as a piston-cylinder unit and a cylindrical damper housing 2 includes in which slidably guided a piston 3 is reciprocable. The particular cylindrical piston 3 slides during movement in the damper housing 2 with its circumferential outside 6 or portions thereof on an inner wall of the damper housing 2 , On the piston 3 is centric to the roll longitudinal axis a piston rod 4 fixed, which through an opening 5 in a frontal part of the damper housing 2 led to the outside. The opening 5 is on the outside of the piston rod 4 tuned designed. With the movement of the piston rod 4 coupled is the movement of the movable furniture part (not shown).

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

The outside 6 of the piston 3 here has longitudinal grooves 7 (lying in the cutting plane) with a comparatively small groove depth. The piston 3 separates a first volume area 8a or negative pressure range of a second volume range 8b or overpressure area of the housing interior 8th , During the forward movement of the piston 3 in the damper housing 2 from the in 1 shown almost completely retracted position to the in 2 shown far retracted position in the damper housing 2 , that is, during the steaming process, so while one is in the volume range 8b existing gas is compressed, but there may be some slight overflow of the gas from the overpressure side 8b to the negative pressure side 8a respectively.

3 and 4 show an air damper according to the invention 9 in the to the 1 and 2 corresponding positions. The air damper 9 includes a piston 10 with piston rod 11 , where the piston 10 can be moved back and forth in a housing 12 , As an essential difference to the fluid damper according to 1 and 2 shows the case 12 a frontal opening 14 on which a second volume range 13b a housing interior 13 opens to the outside. A first volume range 13b of the housing interior 13 is according to the in the 1 and 2 formed arrangement shown.

In the damping process with the displacement of the piston 10 from the position according to 3 to the position according to 4 can through the opening 14 even with a possibly very fast moving the piston 10 in the case 12 towards the opening 14 no increased pressure in the second volume range 13b build up, creating a recoil effect on the piston 10 and thus to the relevant furniture part coupled therewith is avoided. Because it can be a sufficiently large amount or sufficiently fast air from the second volume range 13b step outside. At the same time, in the first volume range 13a a nearly constant negative pressure of z. B. about 0.1 bar. In the second volume range 13b the pressure is the same as outside the case 12 So usually ambient or atmospheric pressure.

In the 5 to 8th is a well-known fluid damper 15 shown, where 5 an initial situation before a damping process with the fluid damper 15 shows. For example, in a hohlzy lindrischen housing 16 of the fluid damper 15 is a piston 17 with attached piston rod 18 displaceable. On the piston 17 is outside z. B. peripherally circumferentially formed a piston sleeve 19 present, which consists in particular of an elastic, such as rubber-elastic material. The piston cuff 19 is fixed to the piston, that depends on the outside or inside of the piston sleeve 19 applied pressure, the piston cuff 19 takes a corresponding form, for. B. inflates or bulges outward or in the direction of the piston 17 is pressed.

The housing 16 is formed at least substantially closed fluid-tight manner to the outside, wherein via an opening 31 the piston rod 18 stored and from the inside of the case 16 penetrates to the outside. With the piston rod 18 coupled or connected is a movable via an automatic retraction in a closed position bringable furniture part (not shown).

Before the piston movement for damping the last partial path of the furniture part insertion ( 5 ) prevails in particular a balanced pressure ratio inside the housing 16 , wherein the piston cuff 19 on the piston 17 rests and in particular not in frictional contact with an inner wall 16a of the housing 16 is. Inside the case 16 or on both sides of the piston 17 For example, there is a pressure from a bar or atmospheric pressure.

6 to 8th shows each of the fluid damper 15 with in the housing 16 different far during the deceleration of the movable furniture part inserted piston 17 , in which 6 indicates the state shortly after the start of the sliding movement, which corresponds to the last part of the insertion movement of the movable furniture part.

In 6 is the piston 17 in relation to the position according to 5 only slightly into the housing 16 inserted for example by a few millimeters. This results in a direction of movement of the piston 17 rearward volume range 20 in the case 16 already a low or low pressure p1, for example, 0.9 bar. This is achieved by using highly schematically represented sealant 22 on the piston 17 the volume range 20 from one in the direction of movement of the piston 17 in front of the piston 17 lying volume range 21 is tightly separated. In the volume range 20 falls by further displacement of the piston 17 in the direction of movement as in 7 and 8th shown, the pressure of 0.9 bar only to a pressure p2 of z. B. about 0.85 bar according to 7 and 8th ,

In the simultaneously decreasing volume range 21 in front of the piston 17 is in the state according to 6 and 7 the pressure remains almost constant or only slightly above about 1 bar rise. Only on the last leg of the insertion path according to 8th is in the volume range 21 a strong increase in pressure to, for example, over 4 bar. As a result, in the known fluid damper according to the 6 to 8th in the insertion position according to 8th shortly before reaching a fully closed position of the movable furniture part triggered a rebound effect. 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 during the movement of the piston 17 in the case 16 takes place according to 6 to 8th by friction between the outwardly curved piston sleeve 19 on the inner wall 16a of the housing 16 ,

Due to the low pressure p1 of approx. 0.9 bar in the volume range 20 becomes the piston cuff 19 bulged outwards and against the inner wall 16a pressed so that the deceleration process immediately after the start of the insertion movement of the piston 17 into the housing 16 starts.

9 shows a highly schematically illustrated fluid damper according to the invention 23 with a frontally open housing 24 , a piston displaceable therein 25 with piston rod and piston sleeve 26 and sealants 27 , Through the opening 28 , which must be sufficiently large, can be on the last stretch of the insertion movement of the piston 25 in a leading volume range 29 form no or no impacting overpressure, which avoids a rebound effect. In the rear volume area 30 in the case 24 but it is like the fluid damper 15 according to the 5 to 8th a negative pressure immediately after the beginning of an insertion movement of the piston 25 in the case 24 realized and thus the bulging of the piston sleeve 26 achieved, whereby the decelerating or damping effect of the fluid damper 23 unchanged effectively unchanged.

1

fluid damper

2

damper housing

3

piston

4

piston rod

5

opening

6

outside

7

longitudinal grooves

8th

housing interior

8a

volume range

8b

volume range

9

steamers

10

piston

11

piston rod

12

casing

13

housing interior

13a

volume range

13b

volume range

14

opening

15

fluid damper

16

casing

16a

inner wall

17

piston

18

piston rod

19

piston packing

20

volume range

21

volume range

22

sealant

23

fluid damper

24

casing

25

piston

26

piston packing

27

sealant

28

opening

29

volume range

30

volume range

31

opening

Claims (11)

Device for braking a movement of a furniture part movable relative to a body by damping, comprising a housing ( 12 ), which has a sliding room ( 13 ) for displaceably guided therein piston means ( 10 ), which can be coupled to the furniture part, wherein by moving the piston means ( 10 ) in the moving room ( 13 ), a damping effect can be achieved, characterized in that the device is designed such that when normal use of the control during braking a reversal of the direction of movement of the decelerated furniture part due to a resulting during braking elastic Abbremsanteils by avoiding a rebound fluid cushion in a pressure chamber does not occur. 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 ( 13a ) of the transfer room ( 13 ) is determined. Device according to Claim 1 or 2, characterized in that a friction section provided on the piston means passes through the Low pressure in the first volume range is displaceable such that the Friction section with a wall portion of the sliding chamber in Frictional contact passes. Device according to claim 1 or 2, characterized in that the device is designed such that substantially no increase in pressure in a second volume range during the braking process ( 13b ) takes place. Device according to one of the preceding claims, characterized in that the device is designed, only a pressure increase in the second volume range ( 13b ) in a predefinable value range. Device according to one of the preceding claims, characterized in that the device is designed such that during the braking process, the second volume range ( 13b ) is at least approximately under ambient pressure, in particular under atmospheric pressure. Device according to one of the preceding claims, characterized in that the housing ( 12 ), the first volume range ( 13a ) To denote outwardly substantially dense. Device according to one of the preceding claims, characterized in that a passage ( 14 ) is present, by means of which during the braking process between the sliding chamber ( 13 ) and an outside area, an overflow of fluid can take place. Device according to one of the preceding claims, characterized in that the passage ( 14 ), an overflow of fluid from the second volume range ( 13b ) to the outside. Device according to one of the preceding claims, characterized in that the device is designed such that the first ( 13a ) and the second volume area ( 13b ) by the piston means ( 10 ) are separated from each other at least almost gas-tight. Furniture with a relative to a fixed body movable furniture part, the furniture being a Device according to one of the preceding claims.