KR20160018776A - Damper for movable furniture parts - Google Patents

Abstract

A damper (10) for a movable furniture part (3)
A damper housing 11,
- the fluid chamber (14) in the damper housing (11)
- an extended drive part (12) movably, in particular rotatably mounted, in the damper housing (11) and extending in the axial direction (x), and
- a sealing element (30) arranged between said damper housing (11) and said drive part (12)
A spacer element 30 for limiting the movement of the sealing element 30 in the axial direction x and preventing direct contact between the sealing element 30 and the driving part 12 in the axial direction x 40).

Description

DAMPER FOR MOVABLE FURNITURE PARTS FOR MOVABLE FURNITURE PARTS

The present invention relates to a damper comprising a damper housing, a fluid chamber in the damper housing, a drive element movably mounted on the damper housing, in particular an axially extending drive part rotatably mounted, and a sealing element disposed between the damper housing and the drive part , A damper for a movable furniture part. The present invention also relates to a furniture fitting or a furniture fitting having a damping device for damping the movement of a movable furniture part.

Over the years, a wide variety of dampers have been used in furniture fittings. One type of damper in this connection is a hinge damper, which is generally located in the area of the hinge cup, which dampens the closing movement of the movable furniture part in order to prevent damage and loud noises as much as possible.

AT 511 847 B1 discloses such a damper which in particular comprises a compensating body which can be deformed in the region of the fluid chamber.

In addition, the Austrian utility model registration application having an application number GM 8065/2013 (corresponding to DE 20 2013 009 699 U1), which is not preliminary published, has a damper for a movable furniture part, in particular including a driving part protruding into the fluid chamber .

However, in the prior art, a problem arises precisely in the area of this drive part. When the drive part projects into the fluid chamber for transferring motion from the movable furniture part to the damping piston, the area where the drive part is supported in the damper housing must be sealed by a sealing element. In this way, the damper fluid can not leak from the fluid chamber. In this case, under normal circumstances, the sealing element is arranged in such a manner as to be fixed to the damper housing, and is supported with the sealing lip in the rotating driving part. However, movement of the drive portion in the damping medium causes a pump effect in the fluid chamber. The pump effect sometimes causes the sealing element to move axially outwardly along the drive portion, thus causing a relative movement to the damper housing. In this case, the sealing element may move frequently to such an extent that the sealing element is axially supported on the shoulder or protrusion on the drive portion, so that instead of the sealing element being fixed to the damper housing, do. As a result, leakage of the fluid chamber occurs.

It is therefore an object of the present invention to provide an improved damper over the prior art. Above all, the present invention is intended to avoid problems arising in the prior art. In particular, the present invention provides for this to maximally seal the fluid chamber of the damper.

An object of the present invention is achieved by a damper having the feature of claim 1. Thus, according to the invention, there is provided a spacer element, which restricts the axial movement of the sealing element and prevents direct contact between the sealing element and the driving part in the axial direction Lt; / RTI > of the length range of. Thus, the sealing element is no longer axially supported on the drive portion, and consequently does not rotate with the drive portion, thereby preventing leakage of the fluid chamber. Thus, the spacer element according to the invention performs two functions, on the one hand, limiting the radius of movement of the sealing element and on the other hand not allowing lateral contact between the sealing element and the driving part. Preferred embodiments are set forth in the accompanying claims.

According to a preferred embodiment, the drive portion is provided with a radially outwardly directed protrusion. Therefore, more particularly, the spacer element prevents direct contact between the sealing member and the projection on the driving portion. Particularly preferably, the projection is disposed on the side of the sealing element facing opposite to the fluid chamber. This provides that the spacer element is disposed between the protrusion and the sealing element.

The sealing element may be provided with a circular or elliptical cross section. Preferably, however, it is provided that the sealing element is supported on the driving portion together with the sealing lip sealing the fluid chamber. In a precise configuration of the sealing element, the sealing element preferably has a holding area for connecting the sealing element to the damper housing, preferably with a frictional locking relationship, and a side flank between the holding area and the sealing lip Wherein the side flank is not in contact with the drive portion and can only contact the damper housing or the spacer element. Preferably, the sealing element is provided with at least one flexible compression retention projection, preferably two retention projections, in the retention area, in order to provide reliable retention and secure fixation to the sealing element in the damper housing.

The possibility that the sealing element is only hermetically supported in a partial area of the driving part should not be excluded. Preferably, it is provided that the sealing element is formed in an annular configuration, and the sealing element radially surrounds the driving part. In order to conform to the annular configuration of the sealing element, the driving portion is preferably provided in the form of a drive shaft, at least part of which is region-wise, and in which the sealing lip is supported. The rotation axis of the drive shaft corresponds to the axial direction.

There are two basic configuration variations for spacer elements. According to a first variant, the spacer element is movable relative to the damper housing. In that regard, preferably the spacer element is provided in the form of an annular flat washer. According to a second variant, the spacer element can be fixedly connected to the damper housing.

According to a preferred embodiment, the damper may have a damping piston mounted in a fluid chamber, in particular slidably mounted. It is also possible that a lever arm is connected to the drive part, wherein the lever arm is supported by the damping piston and the movement of the movable furniture part can be transmitted to the damping piston via the lever arm by the drive part.

In addition, the present invention seeks to protect a furniture fitting having a damper according to the present invention in order to damp the movement of a furniture fitting. In this regard, the furniture fitting may be provided in the form of a furniture hinge, said furniture hinge having a hinge cup connected to the hinge arm by at least one joint lever, the damper being mounted in the hinge cup or mounted on the hinge cup do. According to a preferred embodiment, the actuating element, which is movably mounted in the hinge cup in this case, can be actuated by the joint lever, which is movably connected to the driving part of the damper for acting on the damping piston.

Further details and advantages of the present invention will be described in more detail with reference to the embodiments shown in the drawings:
Figure 1 shows a perspective view of a furniture article in the form of a cabinet with a pivotally mounted door.
Figures 2a and 2b show two different perspective views of a furniture hinge with a damper mounted on the hinge cup.
Figures 3A-3C show three different cross-sectional views of the damper.
Figures 4 to 4e show several views of the damper of the spacer element of the first embodiment.
Figures 5 to 5e show several views of the damper of the spacer element of the second embodiment.
Figures 6 to 6C show several views of the damper of the spacer element of the third embodiment.

Figure 1 shows a perspective view of a furniture product with a furniture carcass 2, in which a movable furniture part in the form of a door or a flap is pivoted to the furniture body 2 by a furniture fitting in the form of a furniture hinge 4, Respectively. The furniture hinge 4 has a hinge arm 5 fixed to the furniture main body 2 and a hinge cup 6 pivotally connected to the hinge arm 5. Each hinge cup 6 is mounted with or mounted within a respective damper 10 (not shown) (see FIG. 2B), and the hinge cup 6 includes a movable furniture part 3 ) With a damper or dampers (10) in the bore of the cylinder. The closing and / or opening movement of the furniture hinge 4 and thus the closing and / or opening movement of the movable furniture part 3 can be attenuated by at least one damper 10.

Figures 2a and 2b show two different perspective views of the furniture hinge (4). There is provided a fixing flange 7 for fixing the hinge cup 6 to the movable furniture part 3. The hinge cup (6) is hingedly connected to the hinge arm (5) by at least one joint lever (8). The actuating element 31 is pivotally mounted in the hinge cup 6 or in the hinge cup 6 about a pivot axis 9 wherein the lever 8 is moved in the closing motion of the furniture hinge 4 Passes through the inside of the hinge cup 6, and in this process, the rotary motion is given to the operating element 31. [ Such rotational movement of the actuating element 31 can be converted into a linear movement of the damping piston 15 (Fig. 3A) of the damper 10 by a transmission mechanism. In the illustrated embodiment, a damper 10 having a damper housing 11 is disposed under the outer wall of the hinge cup 6 and the fixing flange 7. A return mechanism 35 is mounted on the outer wall of the hinge cup 6 facing the hinge cup 6. The return element 35 rotatably mounts the actuating element 31 to the hinge cup 6 after the damping stroke is completed It can be returned to the start position. The hinge cup 6 can be inserted into a cylindrical standard furniture hole with a damper 10 and a return mechanism 35 mounted thereon. In the mounted position, the hinge cup 6 is then placed with the damper 10 and with the structural unit of the return mechanism 35 in the conceptual bore diameter of the cylindrical standard furniture hole. The return mechanism 35 may have, for example, a torsion spring, which allows the actuating element 31 to rotate back to its starting position. The actuating element 31 can be prevented from rotating by its manually operated switch 36 (Fig. 2a), so that the damping function of the damper 10 can be deactivated if necessary. The structural unit of the return mechanism 35 may be replaced by an additional damper 10 having a damper housing 11 in which case the return motion of the actuating element 31 is transmitted to the damper housing 11 (FIG. 3A) disposed in the return spring 19 (FIG.

Fig. 3A is a perspective view of the damper 10, and the damping piston 15 is disposed at the start position of the damping stroke. The damper housing (11) is provided with at least one fluid chamber (14) in which a damping piston is linearly and slidably mounted. The fluid chamber 14 is filled with a fluid, preferably a liquid. In the illustrated embodiment, the damping piston 15 comprises a two-part construction comprising an inner piston 16 and a sleeve 17 disposed in the inner piston 16. [ The lever arm 13 is provided in cooperation with the end portion 18 of the damping piston 15 so that the lever arm 13 can be moved in cooperation with the end portion 18 of the damping piston 15, do. The drive portion 12 is movably connected to the actuating element 31 shown in Figure 2a so that the drive portion 12 is rotated with the actuating element 31 as the actuating element 31 rotates. In this case, the lever arm 13 of the drive part 12 pushes the damping piston 15 into the fluid chamber 14 . After the damping stroke is executed, the damping piston 15 can be returned to the ready position for the next damping stroke by the force of the return spring 19. [ The drive portion 12 partially protrudes into the fluid chamber 14 and is surrounded by a damping fluid, preferably a damping liquid, disposed in the fluid chamber 14. [ When the drive portion 12 is rotated, the additional volume of liquid is not changed, and for this reason, volume compensation is not required to compensate for the volume change by the damping piston 15 moving into the fluid chamber 14. [ The rotational axis 9 of the drive part 12 is preferably arranged coaxially with the rotational axis 9 of the actuating element 31 (Fig. The entire cross-section of the driving portion is constituted in a solid state. In other words, the driving portion is not hollow, and the entire space between the outer upper or peripheral surfaces is filled.

Fig. 3B shows a side view of the damper 10, and the position of the damping piston 13 corresponds to that shown in Fig. 3A. The driving portion 12 is movably mounted with respect to the damping piston 15. In the illustrated embodiment, the drive portion 12 is mounted to rotate about a rotational axis 9, wherein the rotational axis 9 of the drive portion 12 is oriented in the direction of the linear damping stroke of the damping piston 15 . There is a space between the inner piston 16 and the sleeve 17, in which a functional unit in the form of overload protection means 22 is arranged. The at least one overloaded opening of the inner piston 16 can be opened by the overload protection means 22 when the pressure acting on the damping piston 15 is above the threshold value so that the pressure can be reduced rapidly in case of overload .

3C shows the drive part 12 in the operating position in which the damping piston 15 is at the pressed end position (i.e. the end point of the damping stroke). The damping piston 15 is pressed counterclockwise about the rotary shaft 9 by the rotation of the driving portion 12. [ The drive portion 12 is surrounded by the hydraulic damping medium in the fluid chamber 14 so that wear of the end portions 18 of the lever arm 13 and the damping piston 15 can be reduced. The fluid chamber 14 is filled with a damping fluid through the filling passage 23, and the integrity of the fluid chamber 14 is realized by the closure aperture 20. In the illustrated embodiment, the rotatably mounted drive portion 12 can be returned by the external return mechanism 35 (Fig. 2B), whereas the return motion of the damping piston 15 is effected in an independent manner, I. E., By the return spring 19. 2A) is immediately returned with the drive portion 12 by the force of the return mechanism 35 and the return motion of the damping piston 15 is transmitted to the return spring 12 of the damper housing 11 Is performed in a trailing relationship by the force of the spring (19). The return motion of the damping piston 15, the drive portion 12 and the actuating element 31 is not affected by the damper housing 11, The return spring 19 can be operated exclusively.

4 shows an exploded view of the damper 10 showing, in particular, the area around the drive part 12. Fig. Here, in principle, it can be seen that the damper 10 has two parts of the damper housing 11 having the first housing part 11a and the second housing part 11b. A sealing portion 41 is disposed between these two housing portions 11a, 11b. 4 also shows the closure hole 20, the damping piston 15 and the return spring 19, the function of which has been described in the previous description of the drawings. The driving portion 12 is rotatably mounted in the opening 44 of the housing portion 11b. The lever arm 13 is mounted in a positive locking relationship to the end of the drive portion 12 and the lever arm 13 is supported on the end portion 18 of the damping piston 15. A sealing element 30 for sealing the fluid chamber 14 is disposed between the damper housing 11 and the drive part 12 in the region of the opening 44. [ A spacer element 40 is also provided in the axial direction x between the sealing element 30 and the drive part 12, which in this embodiment is in the form of an annular flat washer. The spacer element (40) is not fixedly connected to the damper housing (11). On the other hand, the cover 42 can be fixedly connected to the housing portion 11b, so that the driving portion 12 is held in the axial direction.

 In Fig. 4a, the components of Fig. 4 are shown in cross-section in the assembled state. The detail of FIG. 4b in particular shows that the sealing element 30 is supported radially by the sealing lip 32 on the driving portion 12. In addition to the sealing lip 32, the sealing element also includes two side flank 34 and holding area 33. [ The retaining region 33 is provided with an elastic retaining projection 37 which serves to maintain the sealing element 30 in a frictional locking relationship within the housing portion 11b. A spacer element 40 is arranged in the axial direction x between the sealing element 30 or the shoulder or projection 43 on the drive part 12 and the side flank 34. [ The spacer element 40 restricts axial movement x of the sealing element 30 and allows direct contact of the sealing element 30 and the driving portion 12, except by the sealing lip 32, . Figure 4c again shows a 3D cross-sectional view of the damper 10. Figure 4e shows another cross-sectional view of the damper 10, wherein the sealing element 30 is shown above the holding area 33, which is its desired normal position of the housing part 11b. The sealing effect of the pumping effect occurring as the driving portion 12 rotates in the fluid chamber 14 allows the sealing element 30 to move outward in the axial direction x. The spacer element 40 prevents direct contact with the projection 43 on the drive portion 12 and thus prevents unwanted rotation of the drive portion 12 and the sealing element 30. [

Figure 5 shows another embodiment of a damper 10, in which the spacer element 40 is fixedly connected to the housing portion 11b. As shown in Figures 5a, 5b and 5c, the spacer element 40 is secured to the housing portion 11b in a frictional locking relationship or in a stationary manner. The cover 42 prevents the spacer element 40 and also the drive portion 12 from slipping off. In this embodiment, the spacer element 40 serves to prevent direct contact between the sealing element 30 and the drive part 12 in the axial direction x. In this regard, Figures 5d and 5e also show the normal position of the sealing element 30 and the "moved" position of the sealing element 30 again.

A third modification of the present invention is shown in Figs. 6 to 6C. In this connection, as in the second embodiment, the spacer element 40 can be fixedly connected to the damper housing 11 or can be connected. However, unlike the second embodiment, the spacer element 40 is a single member with the cover 42. In this case the cover 42 has a "protrusion" forming the spacer element 40 so to speak that the sealing element 30 is moved in the axial direction x to the spacer element 40 in the " And is not supported by the driving part 12. [ 6B and 6C illustrate a slightly modified embodiment of the spacer element 40 or cover 42 adapted to a slightly different outer contour of the drive portion 12.

Claims (14)

A damper (10) for a movable furniture part (3)
A damper housing 11,
- the fluid chamber (14) in the damper housing (11)
- an extended drive part (12) movably, in particular rotatably mounted, in the damper housing (11) and extending in the axial direction (x), and
- a sealing element (30) arranged between said damper housing (11) and said drive part (12)
(10), characterized in that the damper (10)
A spacer element 30 for limiting the movement of the sealing element 30 in the axial direction x and preventing direct contact between the sealing element 30 and the driving part 12 in the axial direction x 40). ≪ / RTI > 2. A damper according to claim 1, wherein the sealing element (30) is supported on the drive part (12) with a seal lip (32) sealing the fluid chamber (14). 3. A device according to claim 2, characterized in that the sealing element (30) comprises a holding region (33) for connecting the sealing element (30) to the damper housing (11) Has a side flank (34) between the damper housing (33) and the sealing lip (32), the side flank (34) is not in contact with the drive part (12) 40). ≪ Desc / Clms Page number 13 > 4. A damper according to claim 3, characterized in that the sealing element (30) has at least one holding projection (37) in the holding area (33). 5. A damper according to any one of claims 1 to 4, characterized in that the sealing element (30) is formed in an annular configuration. 6. A damper according to any one of claims 1 to 5, characterized in that the spacer element (40) is movable relative to the damper housing (11). 7. The damper of claim 6, wherein the spacer element (40) is in the form of an annular flat washer. 6. A damper according to any one of claims 1 to 5, characterized in that the spacer element (40) can be fixedly connected to the damper housing (11). 9. A device according to any one of the preceding claims, characterized in that the drive part (12) is in the form of a drive shaft in which at least part of the region-wise is in the form of a cylinder and on which the sealing lip (32) Damper. 10. A damper according to any one of the preceding claims, characterized in that it has a damping piston (15) which is movably mounted in the fluid chamber (14), in particular slidably mounted. 11. The damping piston according to claim 10, comprising a lever arm (13), said lever arm (13) being connected to said drive part (12), said lever arm (13) being supported by said damping piston Characterized in that the movement of the movable furniture part (3) can be transmitted to the damping piston by said lever arm (13). A furniture fitting, in particular a furniture hinge (4), having a damper (10) according to one of the claims 1 to 11 for damping the movement of the furniture fitting (4). 13. Furniture according to claim 12, characterized in that the furniture fitting in the form of a furniture hinge (4) has a hinge cup (6) connected to the hinge arm (5) by at least one joint lever (8) Is mounted in the cup (6) or mounted on the hinge cup. An operating element (31) movably mounted on the hinge cup (6) is operable by the joint lever (8), and the actuating element (31) comprises a damping piston (15) (12) of the damper (10) in order to actuate the damper (10).

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