CN209875830U

CN209875830U - Furniture buffer and furniture accessory

Info

Publication number: CN209875830U
Application number: CN201690001592.1U
Authority: CN
Inventors: C·格茨; F·菲舍尔
Original assignee: Unisys Co Ltd Blum Si
Current assignee: Unisys Co Ltd Blum Si; Julius Blum GmbH
Priority date: 2016-03-07
Filing date: 2016-12-13
Publication date: 2019-12-31
Anticipated expiration: 2026-12-13
Also published as: DE212016000271U1; WO2017152195A1; AT518359A1; AT16871U1

Abstract

The utility model relates to a furniture buffer (19) and furniture accessory, aim at: reducing the cost for manufacturing the furniture bumper and presenting an additional risk of leakage. The furniture bumper includes: a first housing (13) and at least one first fluid chamber (13a) formed in the first housing (13), in which a plunger (16) for carrying out a first damping stroke (D1) is movably arranged, wherein the first housing (13) is movably arranged in a second fluid chamber (14a) for carrying out a second damping stroke (D2), which second fluid chamber is arranged in the second housing (14), wherein the first housing (13) is completely accommodated within the second fluid chamber (14a) of the second housing (14) in all operating states of the furniture damper (19).

Description

Furniture buffer and furniture accessory

Technical Field

The utility model relates to a furniture buffer, it includes:

-a first housing for the first housing,

at least one first fluid chamber formed in the first housing, in which a plunger for carrying out a first damping stroke is movably arranged,

to perform the second damping stroke, the first housing is movably arranged in a second fluid chamber, which is arranged in the second housing.

The invention further relates to a furniture fitting, in particular a drawer extension guide, having a furniture damper of the type to be described.

Background

In order to brake the movably mounted furniture part or to cushion the movably mounted furniture fitting, a furniture damper is used, so that the movably mounted furniture part can be moved gently and in a balanced manner into the completely closed and/or open end position without disturbing impact noises. When a force is introduced into the furniture damper, a damping action is generated by the relative movement between the plunger and the fluid chamber, wherein the damping fluid flows through the passage of the plunger and/or through a gap formed between the plunger and the inner wall of the fluid chamber. Alternatively or in addition to the damping effect by means of the flow resistance, a reduction of the energy by friction can be provided.

When excessively high forces are introduced into the damper, so-called damper oscillations often occur, i.e. the damping fluid can no longer flow through the plunger or past the plunger to a sufficient extent in the event of such an overload. The increased pressure can then no longer be reduced by the buffer, so that the plunger or a plunger rod connected to the plunger suddenly stops or even rebounds.

EP 1221559B 1 describes a damping device for a furniture part, in which two plungers are arranged in a fluid cylinder in a linearly displaceable manner. An elastically deformable sealing body is arranged between the two plungers, which sealing body is deformed during the damping stroke and is pressed against the inner wall of the fluid cylinder.

DE 20204986U 1 discloses a damping device for a movable furniture part, which has a first cylinder and a first piston which is movable therein. The first cylinder is in turn guided movably in a second cylinder. In the damping stroke, the first plunger is pressed into the first cylinder against the resistance of the spring in a first damping phase, and the first cylinder is then moved into the second cylinder in a second damping phase. The second buffer stage is formed by an air buffer. The disadvantage of this is that the damping force of such an air damper is not satisfactory for many applications and a relatively large axial installation space must be provided for the damping device. In order to adapt the damping device for filling with hydraulic damping medium, a plurality of fluid-tight sealing elements must also be provided, as a result of which the costs for producing the damper are increased and there is an additional risk of leakage.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide a furniture buffer of the type mentioned at the outset, while avoiding the disadvantages discussed above.

According to the invention, this is achieved by a furniture damper comprising a first housing and at least one first fluid chamber formed in the first housing, in which first fluid chamber a plunger for carrying out a first damping stroke is movably arranged, for carrying out a second damping stroke the first housing being movably arranged in a second fluid chamber arranged in a second housing, wherein the first housing is completely accommodated inside the second fluid chamber of the second housing in all operating states of the furniture damper.

Thus, according to the invention, the first housing is completely accommodated inside the second fluid chamber of the second housing in all operating states of the furniture damper.

According to a preferred embodiment of the invention, the plunger is prestressed by the accumulator in a direction opposite to the direction of extension of the first damping path.

According to a preferred embodiment of the invention, the plunger is prestressed by the compression spring in a direction opposite to the direction of extension of the first damping path.

According to a preferred embodiment of the invention, the energy store is arranged in the first fluid chamber of the first housing.

According to a preferred embodiment of the invention, the plunger is connected to a plunger rod, wherein the plunger rod has a smaller diameter than the plunger.

According to a preferred embodiment of the invention, the first housing has a cylindrical section and a first end region and a second end region, wherein the first end region and/or the second end region has a larger diameter than the cylindrical section.

According to a preferred embodiment of the invention, it is provided that the second end region is located on a side of the first housing facing away from the plunger rod, wherein an overload protection device is provided on the second end region of the first housing, by means of which overload opening of the first housing can be opened when a predetermined pressure load on the plunger is exceeded.

According to a preferred embodiment of the invention, a movably mounted switching ring is provided at the second end region of the first housing, wherein the switching ring bears against the second end region of the first housing when the second damping stroke is performed and is spaced apart from the second end region of the first housing when the first housing is moved in a direction opposite to the second damping stroke.

According to a preferred embodiment of the invention, the first housing has at least one recess extending in the longitudinal direction of the first housing, in which recess a projection projecting transversely from the plunger is mounted so as to be displaceable in a limited manner.

According to a preferred embodiment of the invention, the second housing has an inner wall which has the shape of a purely hollow cylinder without grooves or projections.

According to a preferred embodiment of the invention, it is provided that the second housing is made of metal.

According to a preferred embodiment of the invention, it is provided that the second housing is made of steel.

According to a preferred embodiment of the invention, it is provided that the plunger can carry out a maximum first damping stroke relative to the first housing and the first housing can carry out a maximum second damping stroke relative to the second housing, wherein the maximum second damping stroke is at least three times as long as the maximum first damping stroke.

According to a preferred embodiment of the invention, it is provided that the maximum second damping path is at least five times as long as the maximum first damping path.

According to a preferred embodiment of the invention, it is provided that the plunger has a maximum diameter which is equal to the inner diameter of the first fluid chamber.

According to a preferred embodiment of the invention, it is provided that the first housing has a maximum diameter which is equal to the inner diameter of the second fluid chamber.

According to a preferred embodiment of the invention, the plunger has a maximum length which is at least twice as long as the maximum diameter of the plunger.

According to a preferred embodiment of the invention, the plunger has a maximum length which is at least three times as long as the maximum diameter of the plunger.

According to a preferred embodiment of the invention, it is provided that the first housing has a maximum length which is at least twice as long as a maximum diameter of the first housing.

According to a preferred embodiment of the invention, it is provided that the first housing has a maximum length which is at least three times as long as a maximum diameter of the first housing.

According to a preferred embodiment of the invention, it is provided that the first fluid chamber and the second fluid chamber are filled with a buffer fluid in the form of a liquid.

According to a preferred embodiment of the invention, it is provided that the first fluid chamber and the second fluid chamber are filled with a buffer fluid in the form of oil.

The utility model discloses a task still solves through a furniture accessory, and this furniture accessory has the basis the utility model discloses a furniture buffer.

According to a preferred embodiment of the invention, the furniture fitting is designed as a drawer extension guide having a main body rail to be fastened to the furniture body, at least one drawer rail mounted movably relative to the main body rail, wherein the movement of the drawer rail can be damped by means of the furniture damper.

The damper has at least one plunger which is mounted so as to be displaceable in the first fluid chamber of the first housing for carrying out a first damping stroke, so that a movement of the plunger or of a plunger rod connected thereto can be damped by the first section. After the first damping stroke is executed, the first housing with the plunger arranged therein can then be moved in the second fluid chamber of the second housing over a second interval against the resistance of the damping fluid, so that a movement of the first housing relative to the second housing can be damped in a second damping stroke. In this case, the first damping stroke of the plunger and the second damping stroke of the first housing extend in the same direction.

Thus, by the proposed invention, at least two stages of buffering can be brought about. In a possible embodiment, provision may be made for the second damping stroke to be started only when the first damping stroke has completely ended. Alternatively, the first and second damping strokes may also overlap, i.e. the second damping stroke is started before the first damping stroke has completely ended. However, it may be advantageous to provide at least one interval for a second damping stroke after the end of the first damping stroke.

In one embodiment, the plunger can be prestressed in the direction opposite to the extension of the first damping stroke by an accumulator, preferably by a compression spring. The force accumulator influences the damping force of the furniture damper at the beginning of the first damping stroke. The accumulator can be dimensioned relatively small, for example, so that it exerts only a small counterforce on the plunger when the first damping stroke is performed and thus also counteracts the damping force relatively little at the beginning of the damping stroke. In principle, however, the provision of an accumulator can be dispensed with.

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

Here, the first and second fluid chambers are filled with a buffer fluid. The buffer fluid may be either a gas (in particular air) or a liquid (for example an oil having a high viscosity).

In order to introduce force into the furniture damper, a plunger rod can be provided, which is connected to a plunger movably mounted in the first housing and which is guided out of the second housing. Preferably, the plunger rod has a smaller diameter than the plunger.

Drawings

Further details and advantages of the invention are explained with the aid of the following description of the figures. In the drawings:

fig. 1 shows a piece of furniture having drawers, which are mounted displaceably relative to a furniture carcass by means of drawer extension guides,

figure 2 shows a drawer pull-out guide with furniture bumper and drawer side walls,

figures 3a to 3d show the furniture damper in cross-section and the plunger in different positions in the first and second damping strokes in enlarged detail views,

fig. 4 shows the furniture damper in an exploded view.

Detailed Description

Fig. 1 shows a piece of furniture 1 having a furniture carcass 2, wherein a drawer 3 is mounted displaceably relative to the furniture carcass 2 by means of a furniture fitting in the form of a drawer extension guide 4. Alternatively, the furniture fitting can also be designed as a furniture hinge or as an actuating drive for a furniture flap. The drawer 3 has a front panel 5, a drawer bottom panel 6, drawer side walls 7 and a back wall 8, respectively. The drawer extension guide 4 comprises a body rail 9, which is to be fastened to the furniture body 2 via fastening sections 12a, 12b, a drawer rail 10, which is mounted so as to be movable relative to the body rail 9 and is connected to the drawer side wall 7 or to the drawer side wall 7, and optionally an intermediate rail 11, which is mounted so as to be movable between the body rail 9 and the drawer rail 10 in order to enable a complete extension of the drawer 3.

Fig. 2 shows the arrangement with the drawer extension guide 4 and the drawer side wall 7 in a perspective view. The fastening sections 12a, 12b have one or more fastening points 13, 14 for fastening to the furniture carcass 2. A movable intermediate rail 11 is provided between the drawer rail 10 and the main body rail 9, wherein a coupling element 21 is provided on the drawer rail 10, which coupling element can be detachably coupled to the driver 20 of the retraction device 18, so that the drawer rail 10 is gripped by the driver 20 towards the end of the closing movement and can be retracted into the closed end position by the energy store of the retraction device 18. The spring-assisted retraction movement of the drawer rail 10 can be braked up to the closed end position by the furniture damper 19 embodied as a linear damper. In the front end region of the drawer rail 10, at least one supporting roller 22 is supported, which in the closed end position supports the drawer rail 10 relative to the body rail 9, so that the front panel 5 is prevented from being lowered relative to the furniture body 2 in the closed end position.

The drawer side wall 7 is designed as a hollow-chamber profile with an inner profile wall 7a and an outer profile wall 7b, wherein the drawer side wall 7 is designed with a channel 17 which is open downward and extends in the longitudinal direction of the drawer side wall 7 and in which a drawer rail 10 can be arranged. The drawer side wall 7 also has a first fastening means 15a for connection to the back wall 8, a second fastening means 15b for connection to the front panel 5 and a backing plate 16 for supporting the drawer bottom 6.

Fig. 3a shows an embodiment of a furniture damper 19 in a cross-sectional view. The furniture damper 19 comprises at least one plunger 16 connected to a plunger rod 15, which is mounted in a linearly displaceable manner in the first housing 13 for carrying out a first damping stroke D1. The housing 13 (together with the plunger 16) is in turn linearly displaceably mounted in a fluid-tight second housing 14 for carrying out a second damping stroke D2.

Fig. 3b to 3D show different positions of the furniture damper 19 during the first damping stroke D1 and the second damping stroke D2. The plunger 16 connected to the plunger rod 15 is mounted displaceably in a first fluid chamber 13a, preferably in the form of a blind hole, of the first housing 13 and is prestressed by an accumulator 17, preferably by a compression spring, in a direction extending counter to the first damping stroke D1. The plunger 16 has a maximum diameter that is substantially equal to the inner diameter of the first fluid chamber 13 a. The plunger 16 may have a maximum length that is at least two times as long, preferably at least three times as long, as the maximum diameter of the plunger 16. The first housing 13 may have a maximum length that is at least twice as long, preferably at least three times as long, as the maximum diameter of the first housing 13. The plunger 16 may be provided with a seal 36 that is movable along the inner wall of the first fluid chamber 13a of the first housing 13, but the seal 36 is not necessarily required. The first housing 13 comprises a first, preferably conically shaped end region 23 and a second, preferably likewise conically shaped end region 24, between which a cylindrical section 25 extends. The first end region 23 of the first housing 13 is open toward the plunger rod 15 and is therefore connected in fluid communication with the second fluid chamber 14a of the second housing 14. Therefore, the first housing 13 is movably supported in the second fluid chamber 14a of the second housing 14 to perform the second damping stroke D2. The first housing 13 has a maximum diameter which is substantially equal to the inner diameter of the second fluid chamber 14a, wherein the first end region 23 and/or the second end region 24 has a larger diameter than the cylindrical section 25. It is preferably provided that the second housing 14 has an inner wall in the form of a purely hollow cylinder without recesses or projections, so that the second housing 14 can be produced, for example, from a simple cylindrical sleeve made of metal (preferably steel), which is closed off in a fluid-tight manner at one end by a closure element 31 (fig. 3 a).

If, starting from the ready position of the furniture damper 19 according to fig. 3b, the plunger rod 15 is now loaded with a force in the direction of the arrow 32, the plunger 16 is first pressed into the first fluid chamber 13a of the first housing 13 against the action of the force accumulator 17 and against the resistance of the damping fluid in order to carry out the first damping stroke D1 (fig. 3 c). During the further movement of the plunger rod 15 in the direction of arrow 32, the first housing 13 with the plunger 16 accommodated therein is then pressed into the second fluid chamber 14a of the second housing 14 for carrying out a second damping stroke D2, wherein the switching ring 29, which is limitedly movable in the longitudinal direction of the second housing 14, abuts against the second end region 24 of the first housing 13 during the carrying out of the second damping stroke D2 and is spaced apart from the second end region 24 of the first housing 13 during the movement of the first housing 13 in the direction opposite to the second damping stroke D2. The annular channel 30 of the switching ring 29 is closed by the switching ring 29 abutting the second end region 24, so that the buffer fluid on the high-pressure side 33 flows only in the direction of the plunger rod 15 via the gap formed between the switching ring 29 and the inner wall of the second housing 14 and the passage formed between the second end region 24 of the first housing 13 and the inner wall of the second housing 14. As a result, the contact of the shift ring 29 against the second end region 24 of the first housing 13 reduces the flow cross section of the damping fluid and thus generates a relatively high damping force during the second damping stroke D2. Fig. 3d shows the position in which the first housing 13 is pressed further into the second housing 14 than fig. 3 c. The first housing 13 can then be pushed into the second housing 14 so far that the support element 35 connected to the first housing 13 rests against the closed bottom 34 (fig. 3a) of the second housing 14. If the force acting on the plunger rod 15 in the direction of the arrow 32 exceeds a predetermined threshold value, there is an overload safety 26 arranged on the second end region 24 of the first housing 13, by means of which overload opening 43 of the first housing 13 can be opened when a predetermined pressure load on the plunger 16 is exceeded. Overload securing devices 26 of this type are known per se, in which the overload securing device 26 comprises a ball 28 loaded by a spring 27, which ball in normal operation closes the overload opening 43 and in the event of an overload is pressed against the force of the spring 27, so that the overload opening 43 is released for the passage of the damping fluid and the flow cross section of the damping fluid for the passage is increased.

Fig. 4 shows the furniture damper 19 in an exploded view. The plunger 16 connected to the plunger rod 15 is movably supported in the first housing 13 for executing the first damping stroke D1, and the first housing 13 is movably supported inside the second housing 14 for executing the second damping stroke D2. The first housing 13 has a first end region 23 and a second end region 24, between which a cylindrical section 25 with a smaller diameter extends. The first end region 23 and the second end region 24 comprise a plurality of flow openings for the buffer fluid, wherein the flow openings are formed in the illustrated embodiment by teeth provided on the end regions 23, 24, respectively. The first housing 13 has at least one recess 40 extending in the longitudinal direction of the first housing 13, in which a projection 44 projecting transversely from the plunger 16 is displaceably mounted in a limited manner. Furthermore, the first housing 13 is provided with an opening 45 for the passage of a damping fluid. The support element 35, which carries the overload securing device 26 and the shift ring 29, can be connected to the second end region 24 of the first housing 13 via a form-fitting connection 42. For the fluid-tight closure of the second housing 14, a closure element 31 is provided, which can be connected to an end region 38 of the second housing 14. The plunger rod 15 is guided out of the second housing 14 and carries a tappet 39 having a larger diameter than the plunger rod 15. Furthermore, a compensating device 41 is accommodated in the second housing 14, which compensating device serves to compensate for volume changes caused by the plunger rod 15 sinking into the furniture damper 19. The compensating means 41 comprise a sealing element 41c arranged on the support element 41b, which sealing element is displaceably supported against the force of a sealing element return spring 41a when the plunger rod 15 is moved into the second housing 14, so that the volume which the plunger rod displaces by moving into the second housing 14 can be compensated. Upon a return movement of the plunger rod 15, the seal 41c can be returned into the initial position again by the force of the seal return spring 41 a. Alternatively, the compensating device 41 can also be formed from an elastically deformable blank (e.g. foam rubber).

Claims

1. Furniture buffer (19) comprising:

-a first housing (13),

-at least one first fluid chamber (13a) formed in the first housing (13), in which a plunger (16) for performing a first damping stroke (D1) is movably arranged,

for carrying out a second damping stroke (D2), the first housing (13) is arranged movably in a second fluid chamber (14a) which is arranged in the second housing (14),

characterized in that the first housing (13) is completely accommodated inside the second fluid chamber (14a) of the second housing (14) in all operating states of the furniture damper (19).

2. Furniture damper according to claim 1, characterized in that the plunger (16) is prestressed by the accumulator (17) in a direction opposite to the extension of the first damping stroke (D1).

3. Furniture damper according to claim 1, characterized in that the plunger (16) is pre-stressed by a compression spring in a direction opposite to the extension of the first damping stroke (D1).

4. Furniture damper according to claim 2, characterized in that the accumulator (17) is arranged in the first fluid chamber (13a) of the first housing (13).

5. Furniture damper according to one of claims 1 to 4, characterized in that the plunger (16) is connected with a plunger rod (15), wherein the plunger rod (15) has a smaller diameter than the plunger (16).

6. Furniture damper according to claim 5, characterized in that the first housing (13) has a cylindrical section (25) and a first end region (23) and a second end region (24), wherein the first end region (23) and/or the second end region (24) has a larger diameter than the cylindrical section (25).

7. Furniture damper according to claim 6, characterized in that the second end region (24) is located on the side of the first housing (13) facing away from the plunger rod (15), wherein an overload protection device (26) is provided on the second end region (24) of the first housing (13), by means of which overload opening (43) of the first housing (13) can be opened when a predetermined pressure load on the plunger (16) is exceeded.

8. Furniture damper according to claim 6, characterized in that a movably mounted switching ring (29) is provided on the second end region (24) of the first housing (13), wherein the switching ring (29) bears against the second end region (24) of the first housing (13) when the second damping stroke (D2) is performed and is spaced apart from the second end region (24) of the first housing (13) when the first housing (13) is moved in a direction opposite to the second damping stroke (D2).

9. Furniture damper according to one of claims 1 to 4, characterized in that the first housing (13) has at least one recess (40) extending in the longitudinal direction of the first housing (13), in which recess a projection (44) projecting transversely from the plunger (16) is supported in a limitedly movable manner.

10. Furniture damper according to one of claims 1 to 4, characterized in that the second housing (14) has an inner wall which has the shape of a pure hollow cylinder without grooves or protrusions.

11. Furniture buffer according to one of claims 1 to 4, characterized in that the second housing (14) consists of metal.

12. Furniture damper according to one of claims 1 to 4, characterized in that the second housing (14) consists of steel.

13. Furniture damper according to one of claims 1 to 4, characterized in that the plunger (16) is able to carry out a maximum first damping stroke (D1) relative to the first housing (13) and the first housing (13) is able to carry out a maximum second damping stroke (D2) relative to the second housing (14), wherein the maximum second damping stroke (D2) is at least three times as long as the maximum first damping stroke (D1).

14. Furniture damper according to claim 13, characterized in that the maximum second damping stroke (D2) is at least five times as long as the maximum first damping stroke (D1).

15. Furniture damper according to one of claims 1 to 4, characterized in that the plunger (16) has a maximum diameter which is equal to the inner diameter of the first fluid chamber (13 a).

16. Furniture damper according to one of claims 1 to 4, characterized in that the first housing (13) has a maximum diameter which is equal to the inner diameter of the second fluid chamber (14 a).

17. Furniture damper according to one of claims 1 to 4, characterized in that the plunger (16) has a maximum length which is at least twice as long as the maximum diameter of the plunger (16).

18. Furniture damper according to claim 17, characterized in that the plunger (16) has a maximum length which is at least three times as long as the maximum diameter of the plunger (16).

19. Furniture damper according to one of claims 1 to 4, characterized in that the first housing (13) has a maximum length which is at least twice as long as the maximum diameter of the first housing (13).

20. Furniture damper according to claim 19, characterized in that the first housing (13) has a maximum length which is at least three times as long as a maximum diameter of the first housing (13).

21. Furniture buffer according to one of claims 1 to 4, characterized in that the first fluid chamber (13a) and the second fluid chamber (14a) are filled with a buffer fluid in the form of a liquid.

22. Furniture damper according to one of claims 1 to 4, characterized in that the first fluid chamber (13a) and the second fluid chamber (14a) are filled with a damping fluid in the form of oil.

23. Furniture fitting, characterized in that it has a furniture bumper (19) according to one of claims 1 to 22.

24. Furniture fitting according to claim 23, characterized in that it is configured as a drawer pull-out guide (4) having a body rail (9) to be fastened to the furniture body (2), at least one drawer rail (10) movably supported relative to the body rail (9), wherein the movement of the drawer rail (10) can be damped by means of a furniture damper (19).