AT504054A2 - DEVICE FOR CUSHIONING OR BZW. BREAKDOWN OF MOVABLE FURNITURE PARTS OF FURNITURE PIECES - Google Patents

Description

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2

The invention relates to a device for damping or braking of furniture parts movable relative to an immovable furniture part at least during a portion of the total relative movement with a housing having a bore in which a piston is longitudinally displaceable 5, which within the bore in dependence on its displacement position forms at least one variable-size, filled with a liquid damping medium working space, the overflow openings or channels allows a throttled passage of the liquid damping medium from one to a second working space, connected on one side of the piston io a sealed led out of the associated end of the cylinder piston rod is, on the piston-remote outer end, the movement of the furniture part to be damped or braked is transmitted to the piston, and to compensate for possibly through the volume n the piston rod can be provided during retraction changing Gesamtvolu-15 mens of the working spaces a volume compensating device.

Such damping or braking devices are used in furniture, for example, to avoid or at least largely reduce the rapid and energetic closing of doors or closures 20 of drawers of cabinets in the abrupt deceleration of the furniture moving part abutting the carcass. With viscous liquids, such as. B. Silicone oil acting as a damping medium damping devices (eg., DE 10300732 A1) have the advantage over working with gas-25-shaped damping medium devices that these liquid damping medium are virtually incompressible, so that they have no springback properties, which the movable furniture part after reaching the closing position again looking for something to move back from the actual closed position. In this case, the problem arises that the damping or braking forces to be generated for damping a movable furniture part also depend on the mass of the respective furniture part or its closing speed, so that correspondingly different dampers are required for different damping tasks of the damping characteristic. Due to the use of incompressible liquid damping medium, it is therefore necessary to compensate for the volume of the piston rod in the piston rod-side damping chamber by means of the volume of the piston. ♦ · «· ·· ·· · fr ··· ········ * During the extension or retraction of the total volume of the work spaces, it is necessary to provide a volume compensation device, which provides the Length of the housing of the damping or braking device inevitably increased. 5

The invention is based on the object, a damping or. To provide braking device for furniture parts, which is adjustable to different damping or braking forces without conversion or replacement of individual parts. In this case, in particular the critical length of the housing io the damping device in comparison to known from the prior art damping device is at least not to be increased, but preferably still be reduced.

Starting from a device of the type mentioned, this Auf-15 would inventively achieved in that in addition to the piston longitudinally displaceably receiving piston bore at least one further parallel to the piston bore bore is provided, which at least one with a the variable-length work spaces formed by the piston in the piston bore is connected via an overflow passage 20. This configuration makes it possible, for example, to distribute part of the overall length of the working chambers which change during the stroke of the piston rod to two parallel boreholes, thereby saving construction length for the housing. 25 In a preferred embodiment of the invention, the configuration is then made so that the overflow passage connects the piston away from the working chamber of the piston bore with the bore extending parallel to the piston bore, in which the second working space is formed. The overflow passage is then expediently provided in the region of the end of the piston bore facing away from the piston rod, wherein it is then possible to provide a throttling device influencing the resistance to overflowing damping medium between the two housing bores in the overflow passage.

The throttle effect of the throttle device is then useful in relation to the parallel to the piston bore bores in the working space of the 35

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Piston hole overflowing working fluid adjustable formed variable, whereby the desired adaptation of the device is made possible in the case of different masses of the furniture components to be damped different damping forces. 5

In a preferred embodiment of the invention, the throttle device provided in a piston rod away from the working space of the piston bore, resiliently biased in contact with a housing seat throttle plate, wherein a rotatably arranged in the housing adjusting element is provided with an engaging the throttle plate 10 eccentric, which a infinitely variable change in the size of the throttle gap formed between the throttle plate and the seat and thus allows a change in the damping characteristic. 15 The adjustment is then suitably sealed stored in a housing side open opening bore and provided at its outer end of the housing with means for rotation. These means may for example be formed by at least one recess or a projection for applying a tool in or at the front end of the adjusting who-20. Thus, then a change in the damping or braking characteristics by means of a screwdriver or a socket wrench without removing the device in a simple and fast way possible.

In an alternative embodiment of the invention, the piston Boh-25 tion is connected by two in the direction of the piston stroke spaced over-strömdurchlässe with the bore extending parallel to the piston bore, in which then extending parallel to the piston bore hole in the area between the mouths of Überströmdurchlässe a throttle device is provided. The design is expediently made such that the one overflow passage connects the piston rod-facing working space of the piston bore with the bore extending parallel to the piston bore in the area of the piston rod facing away from the piston bore, in which case the second overflow passage in the region of the piston rod side Workspace the piston bore is provided. 35

Also in this embodiment, the throttle device is preferably designed adjustable variable in the throttle action. • 9 • 9 999 9999 «9 • 9 9 9 9 9 9 9 ··« · · 99 · 99 5

In an advantageous embodiment, this is achieved in that the throttle device comprises a longitudinally adjustable throttle element with an elongated shaft which tapers slightly co-5 nisch in the direction of its free end, wherein the conically tapered end longitudinally displaceable in a reduced diameter portion the bore parallel to the piston bore is arranged. The possibility of longitudinal displacement of the conically tapering end of the throttle shaft is a change in the annular gap between this end and its diameter reduced Ab-10 cut in the second bore and thus a change in the throttle effect possible.

The diameter-reduced portion of the bore is provided for this purpose in the region between the two overflow passages, wherein the 15 opposite end of the tapered end of the throttle shaft is advantageously rotatably attached to a plug inserted in the associated bore plug, and the plug in threaded engagement with a associated threaded portion is in the bore extending parallel to the piston bore. 20

In order to allow an adjustment of the throttle effect without removal or modification of the device in this embodiment, the bore extending parallel to the piston bore then opens expediently open in its conical veijüngenden throttle shaft end in the housing 25 and in the exposed in the mouth End face of the plug means are provided for rotating the throttle element.

These means can be formed in this embodiment of at least one recess or a projection for applying a tool, for example, 3 0 of a screwdriver, in or at the free end of the end throttle element. Thus, even in this embodiment, the damping or braking characteristics by means of a screwdriver or Aufsteckschlüssels without removal or modification of the device from the outside easily and quickly possible.

In a further development according to the invention, an opening opening in the piston rod of the piston on the one hand and in the circumferential area of the piston on the other hand can be provided, in which a passage of liquid damping medium away from the piston rod is provided Working space to the piston rod-side working space is arranged on the occurrence of an impermissibly high pressure in the damping medium contained in the piston rod abgewand 5-damping valve enabling overpressure safety valve. This safety valve is then in the simplest case of one of a biased spring against a valve seat in the passage crowded valve body, z. B. formed in the form of a sphere. 10

The invention is explained in more detail in the following description of two exemplary embodiments in conjunction with the drawing, namely show: 15 20 25th

Fig. 1 u. 2 each show a central section through the housing of a first exemplary embodiment of a damping or braking device according to the invention in a schematic illustration in two different functional positions of the throttle device integrated in the housing;

FIG. 3 is an exploded view of the device shown in FIGS. 1 and 2; FIG.

FIG. 4 shows a representation corresponding to FIG. 3 in the assembled state; FIG.

5 shows the portion of the damping device shown in Figure 4 within the dot-dashed circle in an enlarged scale.

6 shows a longitudinal center section through the housing of a second exemplary embodiment of a damping or braking device according to the invention; 30

Fig. 7 u. 8 is a sectional view seen in the direction of arrows 7 - 7 in FIG. 6, wherein different working positions of the piston in the associated housing bore are illustrated; and

Fig. 9 is a view corresponding to Figure 7 on an enlarged scale, in which additionally the piston is cut and can be seen in the piston provided over-pressure safety valve.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The exemplary embodiment of a damping device according to the invention shown in FIGS. 1 to 5 has a housing 12 which, unlike known damping devices, is provided with a hollow-cylindrical housing, which is generally referred to as a "cylinder" for short Dampers - shaped to accommodate two laterally adjacent parallel cylindrical bores 12a and 12b. In the left in Figures 1 and 2 dargesteilten bore 12a, a piston 14 is arranged longitudinally displaceable, which the bore 12a - depending on the displacement position of the piston 14 - divided into an upper working space 20 and a lower space 21.

At the lower end in the drawing figures of the piston 14, a space 21 passes through the piston rod 24 is connected, which is passed through a the piston bore 12a on the underside closing end 16 Stim cover. In the upper end region, the piston bore 12a is closed by an integral housing wall in the exemplary embodiment shown, wherein in this end region a transfer chamber 26 connecting the working chamber 20 to the upper end region of the bore 12b is provided to form a second working chamber 22 formed there.

In the bore 12b, which is closed at its open underside by a further stimulus lid 18, a piston 28 is arranged longitudinally displaceable, which is displaceable by a piston at its lower end, on the one hand, and the in-axis. ···· t «···« * «····· • · · · · ············································································ δ nenseite the end cover 18 supported, under pressure bias coil spring 30 is biased in the upward direction. The biased by the spring 30 piston 28 thus tries to displace located in the above its upper end surface second working chamber 22 befindliches 5 damping medium via the overflow 26 into the working chamber 20, whereby then inevitably the piston 14 by the there additionally building pressure in the damping medium in Down direction is shifted. The overflow passage 26, which connects the working space 20 with the working space 22, is provided with a throttle device 34, which forms the passage cross section of the overflow passage 26 variably adjustable. 15, the throttle device 34 has a in the piston bore 12 a at obe ren end of the working space 20 arranged throttle disk 36, which is urged by a stationary under compression coil spring 38 in abutment with a formed in the bore 12 a (not designated) seat. With complete contact of the throttle plate 34 on the 2 o seat the overflow 26 is largely closed, so that then built when inserting the piston rod 24 in the piston bore 12 a high throttling effect by the heavily throttled passage of damping medium from the working space 20 via a between the throttle disk and the overflow passage 25 remaining small gap is generated. In Figure 2, this functional position of the throttle plate 34 is shown.

In contrast, FIG. 1 shows a positioning of the throttle disk 36 with the state lifted off in the upper circumferential region from the associated housing seat surface 3, in which, when the piston rod 24 is pushed in, the liquid damping medium displaced from the working space 20 is additionally replaced by the fluid between the bottom side of the throttle body. slice 36 and the housing seat formed gap with enlarged passage cross section in the working space 22 and then pass the displaceable in 3 5 of the bore 12b arranged piston 28 against the

Pretension of the spring 30 acting on it can move in the downward direction. The spring 30 also serves as a return spring, which the

Pushes back piston 28 in the upward direction and displaces the piston 14 in the downward direction via the thereby returned to the working chamber 20 damping medium as soon as the force acting in the direction of insertion on the piston rod force is eliminated.

The damping characteristic determined by the throttled transfer of damping medium from the working chamber 20 into the respective other working chamber 22 is therefore selectable by the throttling effect variably adjustable throttle device 34, so that a variable damping effect is achieved by a corresponding change in the throttle plate 36 and the associated housing. Seat adjustable throttle gap is possible. When overflow of damping medium from the working chamber 22 into the working space 20, the damping effect is additionally influenced by the bias of the spring 38. If this bias is small, the force applied to the orifice plate 36 by the overflowing damping medium increases the size of the throttling gap to a greater extent than when using a higher tension spring 38. the ratio of the resulting upon insertion or in the provision of the piston rod 14 damping forces can be preselected by the choice of the bias of the spring 38.

So that a change in the damping characteristic of the device 10 without installation effort from the outside is possible, in the upper end face of the housing 12 is inserted in a through bore a rotatably mounted adjusting element 40 sealed, which is provided at its inner end with a vorreetenden eccentric 42 of reduced diameter , The peripheral surface of this eccentric 42 engages the spring-facing underside of the throttle disk 36. By rotating the adjusting element 40, the peripheral surface of the eccentric 42 acting on the underside of the throttle plate changes its position with respect to the axis of rotation of the adjusting element 40 and thus raises the throttle disk 36 in the engagement region of the eccentric 40 - depending on the rotational position of the adjusting element in the housing bore - more or less from the housing seat. This rotation of the adjustment can be done in a simple manner by applying a tool, for. B. a screwdriver on a (not shown) Ansetzvertiefung · «• · 1 ·· * · · ·················································································· • 9 9 · · »· · ··· 9 · 99 10 for a turning tool, e. B. a screwdriver, carried out in the externally exposed end face of the adjusting element 40.

The throttle disc 36 and the spring 38 are slidably held on a short shaft 44 5, which protrudes from the inner end face of a closure plug 46 inserted into a continuous housing bore. The shaft 44 enters with its free end into the overflow passage 26 and thus forms an annular throttle gap. The design and arrangement of the individual components of the device can be seen in detail in the exploded perspective view of Figure 3 and the associated Figures 4 and 5, wherein the piston 14 in the bore 12a and the piston 28 in the bore 12b sealing sealing rings 14a and 28a and the adjustment 15 elements 14 in the associated housing bore sealing sealing ring 40a can be seen. In addition, it can be seen that in the end face of the adjusting element 14, a screwdriver slot 41 is formed, in which the cutting edge of a screwdriver is inserted. FIG. 6 shows a second exemplary embodiment 10 'of a damping device according to the invention, the design of which is made with respect to the structure of the damping device such that the functional components of the actual damping device - in accordance with the structure known as piston-cylinder / unit 25 damping devices - are all arranged in the bore 12a, while which is composed of a plurality of longitudinally successive diameter stepped portions composing parallel bore 12b exclusively for receiving an adjustable throttle device 34 ', which a stepless adjustment of Dros-3 o selwirkung in allows the case of displacement of the piston rod 24 and thus of the piston 14 between the two sides of the piston 14 formed working spaces 20 and 22 overflowing damping medium. ««

In the lower, the working space 22 final area of the piston bore tion 12a is one of the piston rod 24 slidably interspersed

Cup seal 50 is arranged, which is biased by a trained as by the piston rod 24 within the housing 12 penetrated coil spring 52 spring in the sense of a shift in the upward direction. The compressive prestress of this helical spring 52 thus attempts to displace pressure medium enclosed in the working chamber 22 via the cup seal 50, this being made possible by throttled overflow of the damping medium via the throttling device 34 'provided in the second bore 12b in the housing. If the pressure in the work area, z. B. increases by the reduction of the total volume of the two working chambers 20, 22 during insertion of the piston rod 24 in the working space 22, the cup seal 50 shifts under compression of the spring 52. D.h. the cup seal, in cooperation with the helical spring acting upon it, forms the volume compensating device required in this embodiment.

In the region of the lower end of the piston 14 (FIGS. 6 and 7) which is in the lower stroke position with the piston rod extended, an overflow passage 26a and in the region of the upper stroke end position (FIG. 8) another overflow passage 26b connects the bore 12a to the longitudinal direction in the FIG Diameter stepped bore 12b, in which the arranged to change the damping characteristic of the damping device 10 'throttle device 34' is arranged. This throttle device 34 'has a replaceable in the lower open mouth of the housing bore 12b throttle element 60, which is formed by a screwed into a threaded portion of the mouth of the bore 12b stopper 62, from the inside of the bore end face conically in his stoppers facing away from free end region tapered shaft 64 vortritt. This conically tapering end portion is thus by turning the plug 62 steplessly in the diameter only slightly larger than the diameter of the shaft sized end portion of the bore 12 b on or herausschraubbar.

As a result, the passage cross-section of the annular Drosseispalts formed in the transition region to the previous, enlarged diameter portion of the bore 12b between the shaft 64 and the step between the successive bore sections is continuously variable, d. H. the throttle effect and thus the damping characteristic of the device 10 'can be changed by turning the plug 62 by means of a screwdriver inserted into a screwdriver slot 41 provided in the outer end face of the plug.

The piston rod 24 is in its out of the bore 12a at the lower end occlusive end cover 16 led out by an area on the outside of the end cover 16 on the one hand and provided on the free end of the piston rod head 56 enlarged diameter spring 58 supported in the in the figures. 7 and 9 illustrated initial positions at which the piston 14 is in its lower stroke end position and the working space 22 is reduced from its minimum volume.

If in the starting position in accordance with Figure 7 standing head 56 at the outer free end of the Kolbestange 24 an unexpectedly high, possibly even shock-like stress is initiated, there may be an impermissible pressure increase in the damping chamber 20 located in the working space, which in consequence Throttle effect of the throttle device 34 can not be reduced immediately. In order to avoid damage or destruction of the damping device 10 'in this case, an overpressure safety valve 66 which responds to the occurrence of an inadmissibly high pressure in the damping medium contained in the working space 20 is provided in FIG. 9 in the interior of FIG is schematically illustrated cut shown piston 14.

This safety valve 66 has an end face of the piston 14 facing in the working space 20 on the one hand and passage opening 68 in the peripheral surface of the piston below the piston seal 14a on the other hand, in which the transfer of liquid damping medium from the working space 20 to the piston rod-side working space 22 at excessively high pressure is possible Overpressure safety valve 66 is provided. In the case illustrated, this safety valve 66 is formed by a valve body 72 in the form of a valve ball 72, which is pressed against a valve seat surface in the passage 66 by a spring 70 under prestress.

11 JULY 2007

Claims (11)

············· # Claims 1. Device (10, 10 ') for dampening or slowing down the movement of furniture parts movable relative to a stationary furniture part at least during a partial section of the total relative movement with a bore (12a) provided in a housing. in which a piston (14) is mounted so as to be longitudinally displaceable, which within the bore (12a) forms at least one size-variable working space (20) filled with a liquid damping medium as a function of its displacement position, which via overflow openings (26; 26b) or channels allows a throttled passage of the liquid damping medium from one into a second working space (22), wherein on one side of the piston (14) an out of the zugeord-15 neten end of the housing led out piston the movement of the furniture part to be damped or braked is transmitted to the piston (14), and to compensate for any change in the volume of the piston rod (14), which may change as a result of the volume of the piston rod (14). 20 rooms (22; 20) may be provided a volume compensating device, characterized in that in the housing (12) in addition to the piston (14) longitudinally displaceably receiving piston bore (12 a) at least one further parallel to the piston bore (12 a) extending bore (12 b ) which is connected via at least one variable-volume working space (20) formed by the piston in the piston bore via an overflow passage (26; 26a, 26b). 2. Apparatus according to claim 1, characterized in that the overflow passage (26) connects the piston rod facing away from working space (20) of the piston bore (12a) with the parallel to the piston bore bore (12b), in which the second Working space (22) is provided. 3. Apparatus according to claim 1 or 2, characterized in that the 35 overflow passage (26) in the region of the rod end facing away from the piston bore (12 a) is provided. Aeon 4. Apparatus according to claim 3, characterized in that in the overflow passage (26) is provided a resistance to the overflowing damping medium between the two housing bores (12a, 12b) influencing throttle device (34). 5. The device according to claim 4, characterized in that the throttle effect of the throttle device (34) with respect to the piston from the bore (12a) parallel bore (12b) in the working space (22) of the piston bore overflowing working fluid variable adjustable is trained. 6. Apparatus according to claim 4 or 5, characterized in that the throttle device (34) has a piston rod in the opposite working space of the piston bore (20) provided resiliently biased in contact with a housing seat throttle plate (36), and that a rotatable in the housing (12) arranged adjusting element (40) with an on the throttle disc (36) engaging eccentric (42) is provided. 7. The device according to claim 6, characterized in that the adjusting element (40) mounted sealed in a housing outside open bore opening and provided at its housing outer side end with means (41) for rotation. 8. The device according to claim 7, characterized in that the means (41) for rotation of the adjusting element (40) of at least one recess or a projection for applying a tool in or on the free end of the adjusting element stimseiti-gene (40) become. 9. The device according to claim 1, characterized in that the piston bore (12 a) by two in the direction of the piston stroke from each other beabstan-ended overflow passages (26 a, 26 b) is connected to the parallel to the piston bore bore (12 b), and in that a throttling device (34 ') is provided in the bore (12b) running parallel to the piston bore in the region between the openings of the overflow passages (26a; 26b). 10. The device according to claim 9, characterized in that the one Überströmdurchlass (26 b) the piston rod facing away from working space (20) of the piston bore (12 a) with the parallel to the piston bore (12 a) run- " , * · · * · «* · ·· * · * - * ···· ···· * · I > · * ·· »·« ·················· connects in the region of the rod end facing away from the piston bore, and that the second overflow passage (26 a) in the region of the piston rod side working space (22) of the piston bore (12 a) is provided. 5 11. The device according to claim 9 or 10, characterized in that the throttle device (34 ') is adjustable adjustable in the throttle effect. 12. Apparatus according to claim 11, characterized in that the throttle device (34 ') has a longitudinally adjustable throttle element (60) with an elongated shaft (64) which tapers slightly conically toward its free end, and that the conically tapering end is longitudinally displaceably arranged in a reduced diameter portion of the bore (12b) parallel to the piston bore (12a). 13. The device according to claim 12, characterized in that the reduced diameter portion of the bore (12b) in the region between the two overflow passages (26a, 26b) is provided. 20 14. The apparatus according to claim 13, characterized in that the tapered end of the opposite end of the throttle shaft (64) rotationally fixed to a in the associated bore (12 b) sealed inserted plug (62) is attached and that the plug (62) in threaded engagement with an associated threaded portion in the bore extending parallel to the piston bore (12a). 15. Device according to claim 14, characterized in that the bore (12b) running parallel to the piston bore (12a) opens openly in the housing (12) in its end facing the conically tapering throttle shaft, and in that the end face of the plug (62) exposed in the mouth is provided with means for rotating the throttling element (60). 16. The apparatus according to claim 15, characterized in that the means (41) for rotating the throttle element (60) of at least one depression + + + + + + + + •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• Applying a tool in or at the free end face of the throttle element (60) are formed. 17. Device according to one of claims 9 to 16, characterized in that 5 in the piston (14) in the piston rod facing away from the end face of the piston (14) on the one hand and in the peripheral surface of the piston on the other hand opening passage (68) is provided, in which a the passage of liquid damping medium from the piston rod remote working space (20) to the piston rod-side working space (22) is arranged on the occurrence of an inadmissibly high pressure 10 in the damping medium contained in the piston rod working space enabling overpressure safety valve (66). 18. Device according to claim 17, characterized in that the safety valve has a valve body (72) urged by a prestressed spring (70) against a valve seat surface in the passage (68). 19. The apparatus according to claim 18, characterized in that the valve body (72) is spherical. 20 11 JULY 2007