AT518359A1 - furniture damper - Google Patents

Abstract

Furniture damper (19), comprising: - a first housing (13), - at least one in the first housing (13) formed first fluid chamber (13a), in which a piston (16) for executing a first damping stroke (D1) is slidably disposed, wherein the first housing (13) is displaceably arranged in a second fluid chamber (14a) arranged in a second housing (14) for carrying out a second damping stroke (D2).

Description

The present invention relates to a furniture damper, comprising: a first housing, at least one first fluid chamber formed in the first housing, in which a piston for displacing a first damping stroke is displaceably arranged.

Furthermore, the invention relates to a furniture fitting, in particular a drawer pull-out, with a furniture damper of the type to be described. Furniture dampers are used for braking movably mounted furniture parts or for damping movably mounted furniture fitting parts, so that the movably mounted furniture part smoothly and smoothly into the completely closed and / or open end position is movable. When a force is introduced into the furniture damper, a damping effect is generated by a relative movement between the piston and the fluid chamber, wherein a damping fluid flows through channels of the piston and / or through a gap formed between the piston and an inner wall of the fluid chamber. Instead of or in addition to the damping effect by means of flow resistance, an energy reduction by friction can be provided.

Excessive force introduction into the damper often results in so-called damper bounce, i. in such an overload case, the damping fluid can no longer flow sufficiently through the piston or past the piston. This increased pressure can then no longer be reduced by the damper, so that the piston or the associated piston rod abruptly stops or even springs back.

In EP 1 221 559 B1 a damping device for furniture parts is described, wherein two pistons are arranged linearly displaceable in a fluid cylinder. Between the two pistons an elastically deformable sealing body is provided, which is deformed during the damping stroke and thereby pressed against the inner wall of the fluid cylinder.

Object of the present invention is to propose a furniture damper of the type mentioned, wherein the Dämpfcharakteristik can be influenced.

This is achieved by the features of claim 1. Further advantageous embodiments of the invention are specified in the dependent subclaims.

According to the invention, it is thus provided that the first housing is displaceably arranged in a second fluid chamber arranged in a second housing for carrying out a second damping stroke.

In other words, the damper has at least one piston, which is displaceably mounted for executing a first damping stroke in a first fluid chamber of a first housing, so that a movement of the piston or a piston rod connected therewith can be damped over a first partial section. After the onset of the first damping stroke then the first housing - together with the piston arranged therein - within a second fluid chamber of a second housing over a second section against the resistance of a damping fluid displaceable, so that in a second damping stroke movement of the first housing relative to the second Housing is damped. The first damping stroke of the piston and the second damping stroke of the first housing thereby run in the same direction.

By the proposed invention, therefore, at least two-phase damping can be brought about. In one possible embodiment it can be provided that the second damping stroke only starts when the first damping stroke is completely completed. Alternatively, an overlap of the first and second damping stroke is possible, i. that the second damping stroke then starts, even before the first damping stroke is completely completed. However, it may be favorable to provide at least one partial section for the second damping stroke after completion of the first damping stroke.

In one embodiment, the piston may be biased in a direction opposite to the first damping stroke direction by a force accumulator, preferably by a compression spring. This energy storage affects the initial damping force of the furniture damper during the first damping stroke. This energy storage can be dimensioned relatively small, for example, so that the energy storage on the piston in the execution of the first Dämpfungshubes only a small opposing force exerts and thus the damping force at the beginning of Dämpfungshubes relatively low fails. On the arrangement of the energy storage but can be dispensed with in principle.

In a further embodiment it can be provided that the piston can perform a first maximum damping stroke relative to the first housing and that the first housing can perform a second maximum damping stroke relative to the second housing, wherein the second maximum damping stroke of the first housing at least three times, preferably at least five times, as long as the first maximum damping stroke of the piston is.

The first fluid chamber and the second fluid chamber are filled with a damping fluid. This damping fluid may be either a gas (especially air) or a liquid (eg, a high viscosity oil).

For introducing force into the furniture damper, a piston rod can be provided, which is connected to the piston displaceably mounted in the first housing and which is guided out of the second housing. It is preferably provided that the piston rod has a smaller diameter than the piston.

Further details and advantages of the present invention will be explained with reference to the following description of the figures. It shows or show:

1 is a piece of furniture with drawers, which are movably mounted on Schubladenausziehführungen relative to a furniture body,

2 a drawer extension guide with a furniture damper and a

Drawer side wall,

3a-3d a furniture damper in cross section and different positions of the piston in the first and second damping stroke in enlarged detail views,

Fig. 4 of the furniture damper in an exploded view.

Fig. 1 shows a furniture 1 with a furniture body 2, wherein drawers 3 are movably mounted on furniture fittings in the form of Schubladenausziehführungen 4 relative to the furniture body 2. Alternatively, the furniture fitting may also be designed as a furniture hinge or as an actuator for furniture flaps. The drawers 3 each have a front panel 5, a drawer bottom 6, drawer side walls 7 and a rear wall 8. The drawer extension guides 4 each comprise a carcass rail 9, which is to be fastened to the furniture body 2 via fastening sections 12a, 12b, a drawer rail 10 displaceably mounted relative to the carcass rail 9, which is connected or to be connected to a drawer side wall 7, and optionally a middle rail 11, which for the realization of a full extension of the drawer 3 between the carcass rail 9 and the drawer rail 10 is movably mounted.

2 shows an arrangement with a drawer pull-out guide 4 and with a drawer side wall 7 in a perspective view. The fastening sections 12a, 12b have one or more fastening points 13, 14 for attachment to the furniture body 2. Between the drawer rail 10 and the carcass rail 9 a movable center rail 11 is arranged, wherein on the drawer rail 10, a coupling element 21 is arranged, which is releasably coupled to a driver 20 of a feed device 18, so that the drawer rail 10 detected by the driver 20 towards the end of the closing movement and is retractable by a power storage of the feeder 18 in a closed end position. By designed as a linear damper furniture damper 19, this spring-assisted retraction movement of the drawer rail 10 can be braked down to the closed end position. In the front end region of the drawer rail 10, at least one support roller 22 is mounted, which supports the drawer rail 10 in the closed end position relative to the carcass rail 9, so that a lowering of the front panel 5 is prevented relative to the furniture body 2 in this closed end position.

The drawer side wall 7 is formed as a hollow chamber profile with an inner profile wall 7a and an outer profile wall 7b, wherein the drawer side wall 7 forms a downwardly open and extending in the longitudinal direction of the drawer side wall 7 channel 17, in which the drawer rail 10 can be arranged. The drawer side wall 7 further comprises a first fastening device 15a for connection to the rear wall 8, a second fastening device 15b for connection to the front panel 5 and a support 16 for supporting the drawer bottom 6.

Fig. 3a shows an embodiment of a furniture damper 19 in a cross section.

The furniture damper 19 comprises at least one piston 16 connected to a piston 16, which is mounted to perform a first damping stroke D1 in a first housing 13 linearly displaceable. This housing 13 (together with the piston 16) is in turn mounted linearly displaceable in a fluid-tight second housing 14 for carrying out a second damping stroke D2.

Fig. 3b-3d show different positions of the furniture damper 19 in the execution of the first damping stroke D1 and the second damping stroke D2. The piston 16 connected to the piston rod 15 is slidably mounted in a first, preferably blind hole-shaped, fluid chamber 13a of the first housing 13 and biased in a direction opposite to the first Dämpfungshub D1 direction by a force accumulator 17, preferably by a compression spring. The piston 16 has a maximum diameter which substantially corresponds to an inner diameter of the first fluid chamber 13a. The piston 16 may have a maximum length which is at least twice, preferably at least three times, as long as the maximum diameter of the piston 16. The first housing 13 may have a maximum length which is at least twice, preferably at least three times, as long as the maximum diameter of the first housing 13. The piston 16 may be provided with a seal 36 which is slidable along an inner wall of the first fluid chamber 13a of the first housing 13, however, the seal 36 is not mandatory. The first housing 13 includes a first, preferably conically shaped, end portion 23 and a second, preferably also conically shaped, end portion 24, between which a cylindrical portion 25 extends. The first end region 23 of the first housing 13 is designed to be open in the direction of the piston rod 15 and is thus connected to a second fluid chamber 14 a of a second

Housing 14 in fluid-conducting connection. The first housing 13 is thus slidably mounted in the second fluid chamber 14a of the second housing 14 for carrying out a second damping stroke D2. The first housing 13 has a maximum diameter, which substantially corresponds to an inner diameter of the second fluid chamber 14 a, wherein the first end portion 23 and / or the second end portion 24 have a larger diameter than the cylindrical portion 25. It is preferably provided that the second housing 14 has an inner wall with a purely hollow cylindrical shape without grooves or projections, so that the second housing 14, for example, from a simple cylindrical sleeve made of metal (preferably steel) can be produced, which at one end by a closure element 31st (Fig. 3a) is completed fluid-tight.

If now, starting from the ready position of the furniture damper 19 according to FIG. 3b, the piston rod 15 is acted upon by a force in the direction of the arrow 32, the piston 16 for executing the first damping stroke D1 against the action of the force accumulator 17 and against the resistance a damping fluid in the first fluid chamber 13 a of the first housing 13 is pressed (Fig. 3c). With a continued movement of the piston rod 15 in the direction of the arrow 32, the first housing 13, together with the piston 16 received therein, is then pressed into the second fluid chamber 14a of the second housing 14 to carry out the second damping stroke D2, wherein a longitudinal direction of the second housing 14 limited movable switching ring 29 in the execution of the second Dämpfungshubes D2 to the second end portion 24 of the first housing 13 and 13 spaced on a movement of the first housing 13 in a direction opposite to the second Dämpfungshub D2 direction of the second end portion 24 of the first housing 13 , By applying the switching ring 29 to the second end portion 24, an annular channel 30 of the switching ring 29 is closed, so that the damping fluid located on the high pressure side 33 exclusively through a gap formed between the switching ring 29 and an inner wall of the second housing 14 and one between the second End portion 24 of the first housing 13 and the inner wall of the second housing 14 formed passage in the direction of the piston rod 15 flows. Thus, by applying the switching ring 29 to the second end portion 24 of the first housing 13, the flow cross-section for the damping fluid is reduced, thus generating a relatively high damping force in the second damping stroke D2. FIG. 3d shows a position of the first housing 13 which is further depressed in comparison to FIG. 3c relative to the second housing 14. The first housing 13 is subsequently pressed into the second housing 14 until a bearing element 35 connected to the first housing 13 contacts the closed bottom 34 (Fig. 3a) of the second housing 14 abuts. If the force on the piston rod 15 in the direction of the arrow 32 exceeds a predetermined threshold value, then an overload protection 26 arranged on the second end region 24 of the first housing 13 is present, through which at least one overload opening 43 of the first housing above a predetermined pressurization of the piston 16 13 is openable. Such overload protection 26 are already known per se, in the illustrated embodiment, the overload protection 26 comprises a spring 27 loaded ball 28, which closes the said overload opening 43 in normal operation and is pressed in the overload against the force of the spring 27, so that the overload opening 43 for the passage of the damping fluid released and the flow cross section for the flowing damping fluid is increased.

Fig. 4 shows the furniture damper 19 in an exploded view. The piston 16 connected to the piston 16 is slidably mounted to perform the first damping stroke D1 in the first housing 13, for carrying out the second damping stroke D2, the first housing 13 is slidably mounted within the second housing 14. The first housing 13 has a first end portion 23 and a second end portion 24, between which extends a smaller diameter cylindrical portion 25. The first end region 23 and the second end region 24 comprise a plurality of throughflow openings for the damping fluid, wherein the throughflow openings in the exemplary embodiment shown are each formed by toothings arranged on the end regions 23, 24. The first housing 13 has at least one extending in the longitudinal direction of the first housing 13 recess 40 in which a protruding from the piston 16 projecting projection 44 is slidably mounted. Further, the first housing 13 is provided with an opening 45 for passage of damping fluid. The bearing element 35, which carries the overload protection 26 and the switching ring 29 is connected via a positive connection 42 with the second end portion 24 of the first housing 13. For the fluid-tight closure of the second housing 14, a closure element 31 is provided, which with an end portion 38 of the second

Housing 14 is connectable. The piston rod 15 is led out of the second housing 14 and carries a plunger 39 whose diameter is greater than the diameter of the piston rod 15. In addition, a compensation device 41 for compensating for a change in volume due to the piston rod 15 immersed in the furniture damper 19 is accommodated in the second housing 14. This compensation device 41 comprises a bearing 41b disposed on a seal 41c, which is displaceably mounted during retraction of the piston rod 15 in the second housing 14 against the force of a seal return spring 41a, so that volume which the piston rod 15 by the retraction into the second housing 14th displaced, compensable. In a return movement of the piston rod 15, the seal 41c is reset by the force of the seal return spring 41a back to the starting position. Alternatively, the compensation device 41 may also be formed by an elastically deformable piece of material (for example sponge rubber).

Claims (17)

claims 1. furniture damper (19), comprising: - a first housing (13), - at least one in the first housing (13) formed first fluid chamber (13a), in which a piston (16) for executing a first damping stroke (D1) slidably disposed is, characterized in that the first housing (13) in a second housing (14) arranged second fluid chamber (14a) for executing a second damping stroke (D2) is slidably disposed. 2. furniture damper according to claim 1, characterized in that the piston (16) in a direction opposite to the first damping stroke (D1) extending direction by a force accumulator (17), preferably by a compression spring, is biased. 3. furniture damper according to claim 2, characterized in that the energy accumulator (17) in the first fluid chamber (13 a) of the first housing (13) is arranged. 4. furniture damper according to one of claims 1 to 3, characterized in that the piston (16) with a piston rod (15) is connected, wherein the piston rod (15) has a smaller diameter than the piston (16). 5. furniture damper according to one of claims 1 to 4, characterized in that the first housing (13) has a cylindrical portion (25) having a first end portion (23) and a second end portion (24), wherein the first end portion (23) and / or the second end portion (24) has a larger diameter than the cylindrical portion (25). 6. Furniture damper according to claim 5, characterized in that the second end region (24) on one of the piston rod (15) facing away from the first housing (13), wherein at the second end region (24) of the first housing (13) an overload protection (26) is arranged, through which above a predetermined pressurization of the piston (16) at least one overload opening (43) of the first housing (13) can be opened. 7. furniture damper according to claim 5 or 6, characterized in that at the second end region (24) of the first housing (13) a movably mounted switching ring (29) is arranged, wherein the switching ring (29) in the execution of the second damping stroke (D2 ) abuts the second end portion (24) of the first housing (13) and is spaced from the second end portion (24) of the first housing (13) upon movement of the first housing (13) in a direction opposite the second damping stroke (D2). 8. Furniture damper according to one of claims 1 to 7, characterized in that the first housing (13) has at least one in the longitudinal direction of the first housing (13) extending recess (40) in which a piston projecting from the piston (16) transversely (44) is mounted limitedly displaceable. 9. furniture damper according to one of claims 1 to 8, characterized in that the second housing (14) has an inner wall with a purely hollow cylindrical shape without grooves or projections. 10. Furniture damper according to one of claims 1 to 9, characterized in that the second housing (14) made of metal, preferably steel, is formed. 11. Furniture damper according to one of claims 1 to 10, characterized in that the piston (16) relative to the first housing (13) has a first maximum damping stroke (D1) and that the first housing (13) relative to the second housing (14) second maximum damping stroke (D2), wherein the second maximum damping stroke (D2) at least three times, preferably at least five times as long as the first maximum damping stroke (D1). 12. Furniture damper according to one of claims 1 to 11, characterized in that the piston (16) has a maximum diameter which substantially corresponds to an inner diameter of the first fluid chamber (13 a). 13. Furniture damper according to one of claims 1 to 12, characterized in that the first housing (13) has a maximum diameter which substantially corresponds to an inner diameter of the second fluid chamber (14 a). 14. Furniture damper according to one of claims 1 to 13, characterized in that the piston (16) has a maximum length which is at least twice, preferably at least three times as long as the maximum diameter of the piston (16). 15. Furniture damper according to one of claims 1 to 14, characterized in that the first housing (13) has a maximum length which is at least twice, preferably at least three times as long as the maximum diameter of the first housing (13). 16. Furniture fitting with a furniture damper (19) according to one of claims 1 to 15. 17. Furniture fitting according to claim 16, characterized in that the furniture fitting is designed as a drawer pull-out guide (4) which has a cabinet rail (9) to be fastened to a furniture carcass (2), at least one drawer rail (10) movably mounted relative to the carcass rail (10). has, by the furniture damper (19) a movement of the drawer rail (10) can be damped.