WO2012045102A1

WO2012045102A1 - Furniture damper

Info

Publication number: WO2012045102A1
Application number: PCT/AT2011/000400
Authority: WO
Inventors: Florian Fischer; Thomas Nagel
Original assignee: Julius Blum Gmbh
Priority date: 2010-10-06
Filing date: 2011-09-29
Publication date: 2012-04-12
Also published as: CN203334865U; DE212011100150U1; AT12440U1

Abstract

The invention relates to a furniture damper (9) for damping a motion of a movably mounted furniture part (3), comprising a fluid chamber (21) and a piston (22), wherein the piston (22) is connected to a piston rod (17) and wherein the piston (22) has an opening (31), into which the piston rod (17) is screwed.

Description

furniture damper

The present invention relates to a furniture damper for damping a movement of a movably mounted furniture part, with a fluid chamber and a piston, wherein the piston is connected to a piston rod.

Furthermore, the invention relates to a furniture hinge with a furniture damper for damping a closing movement and / or an opening movement of the furniture hinge.

Such furniture dampers are used for damping a movement of a movably mounted furniture part or for damping a movably mounted furniture fitting part, so as to reduce the stresses or impact noises occurring during the sudden braking of the furniture parts striking the carcass. During the damping stroke, a relative movement takes place between the fluid chamber and the piston, wherein the damping effect is brought about by a fluid arranged in the fluid chamber, ie either by a compressible fluid (gas or air) or by an incompressible fluid (liquids). The connection between the piston rod and the piston is the Dämpfungshub - especially at oblique force - considerable loads buresetzt, whereby the connection between the piston and the piston rod can buckle and thus the wear is increased.

Known connections between the piston and the piston rod, for example, provide a hinge connection, in which the piston rod has a spherical condyle and the piston is provided with a correspondingly formed head receptacle. Also known are constructions in which the piston rod is riveted to the piston. These refinements are complex to realize, especially in compact furniture dampers due to the very limited space available, the risk of breakage can not be excluded.

Object of the present invention is therefore to provide a furniture damper of the type mentioned above while avoiding the disadvantages mentioned above. 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 piston has an opening in which the piston rod is screwed.

In other words, the piston rod with the piston via a screw connection can be connected, which can be dispensed with elaborate special designs of the piston and the piston rod. These special designs sometimes require considerable space, which is hardly available anyway in the case of compact damper solutions in furniture construction. The piston rod may be accommodated in the piston preferably in the mounted state over at least one third of the piston length, whereby an undesirable buckling between the piston and the piston rod can be largely prevented.

According to one embodiment, it can be provided that the piston rod has a threaded portion on its region facing the piston, which can be screwed into the opening of the piston. It is also possible that the threaded portion is formed at least partially self-tapping, wherein when screwing the piston rod into the opening of the piston, a thread groove in the piston is einschneidbar. In this context, it may be advantageous if the piston is made of a plastic material and the piston rod with the threaded portion formed thereon is made of metal.

It can be provided that the piston rod in the mounted state does not protrude into the fluid chamber remote from the piston rod side of the piston, so that the end of the piston rod facing the piston is completely accommodated within the piston. The provided for receiving the piston rod opening of the piston can be designed as a blind hole or as a stepped bore.

According to one embodiment of the invention can be provided that the piston rod is connected to the piston via a screw in the form of a bayonet closure, wherein the piston rod inserted into the piston and is lockable by relative rotation to the piston with this. In this context, it may be advantageous if the piston has axially extending grooves and the piston rod on its lateral surface projections, wherein the projections of the piston rod are inserted into the grooves of the piston and wherein the projections of the piston rod by relative rotation of the piston rod to the piston itself cut into the flask. The protrusions of the piston rod can be easily produced by a stamping process.

It can also be provided that the piston rod with the piston via the screw non-destructively releasably connected to each other is connected. Under a non-destructively releasable screw while all those types of attachment are to be understood, which are provided so that the piston rod can be repeatedly detached from the piston and attached to this again, without resulting in destruction of the piston, the piston rod or other additional part.

The furniture hinge according to the invention is characterized by a furniture damper of the type in question.

Further features and details of the present invention will be explained with reference to the embodiments shown in the figures. It shows or show:

1 is a perspective view of a piece of furniture with a door which is pivotally mounted on furniture hinges relative to a furniture body,

Fig. 2a, 2b perspective views of a furniture hinge with an im

Hinge pot to be arranged furniture damper as well as with a hinge cup arranged furniture damper,

3a, 3b a furniture hinge with a built-in hinge pot furniture damper and an enlarged detail illustration this,

4 shows the furniture damper with a return mechanism in a perspective sectional view,

5a, 5b is a perspective sectional view of a piston which is screwed with a threaded portion arranged on the piston rod and a representation of the piston rod screwed into the piston, 6a, 6b is a perspective sectional view of a piston which is screwed via a bayonet lock with the piston rod and a representation of the screwed into the piston piston rod,

7a, 7b perspective views of the piston, on the one hand the

Piston rod has a threaded portion and on the other hand laterally protruding projections for fixing with the piston,

Fig. 8 is a perspective view of the end portion of the piston, in

Mounting position facing the piston rod.

Fig. 1 shows a perspective view of a piece of furniture 1, wherein a movable furniture part 3 in the form of a door 3a is pivotally mounted relative to a furniture body 2 via two or more furniture hinges 4. The furniture hinges 4 have in a known manner a to be fastened to a frame 2a stop member 5 and a pivotally connected to the stop member 5 hinge cup 6. In the inner cavity of the hinge cup 6 each (not shown here) furniture damper is mounted by the above a given relative position of the furniture hinge 4 is a closing movement and / or opening movement of the furniture hinge 4 up to the full closed position and / or open position can be damped.

Fig. 2a shows a perspective view of a furniture hinge 4, wherein the hinge cup 6 is connected via at least one hinge lever 7 pivotally connected to the stop member 5 in the form of a hinge arm 5a. Via a spring device 8, the furniture hinge 4 can be moved to the full closed position and / or in the full open position. To damp this spring-assisted movement in the end position (s) a furniture damper 9 is provided which has a housing 12 and a slider 13 which is movable relative thereto. The furniture damper 9 is either already inserted from the factory into the inner cavity 10 of the hinge cup 6 or can be used in a retrofittable manner from above into the hinge cup 6 and arranged within the hinge cup 6 in an alternative manner - with mounted stop member 5 and hinge cup 6, wherein the furniture damper 9 via cooperating fastening means 11 a, 1 1 b in this mounting position with the hinge cup 6 is detachably connectable. In the exemplary embodiment shown, the furniture damper 9 has first fastening means 11a in the form of a guide groove, which arranged on the hinge cup 6 fasteners 11 b are releasably connectable in the form of a fixing pin. The furniture damper 9 has an insertion opening 14, through which the fastening pin 11 b can be arranged in the guide groove 11 a. To deactivate the damping function, the furniture damper 9 has a locking device 15 with a manually adjustable locking element 15a in the form of a switch, through which the slider 13 is releasably locked in the fully depressed position and is thus prevented from its provision. Fig. 2b shows a perspective view of the furniture hinge 4 with the furniture damper 9 in the mounting position. The furniture damper 9 is fully inserted into the inner cavity 10 of the hinge cup 6. During the closing movement of the furniture hinge 4, the articulated lever 7 strikes the slide 13, whereby the damping process is initiated. In the course of the further closing movement of the slider 13 can be pressed relative to the housing 12 in a complete end position.

3a shows a perspective cross section of the furniture hinge 4 with the furniture damper 9 in the mounted position. The furniture hinge 4 has a designed as a hinge arm 5a - preferably L-shaped - stop member 5, which is pivotally connected via a hinge lever 7 with a hinge cup 6. The articulated lever 7 is mounted pivotably about a hinge pin-side rotation axis 23. FIG. 3b shows an enlarged detail view of the area circled in FIG. 3a. Towards the end of the closing movement, the articulated lever 7 impinges on the inclined stop surface 16 of the slide 13 and displaces it relative to the fixed piston 22. The linear damping stroke of the furniture damper 9 is substantially perpendicular to the axis of rotation 23. By the switch 15a, the slider 13 in the pressed-in end position relative to the housing 12 of the furniture damper 9 lockable, whereby the damping effect can be deactivated. Fig. 4 shows the furniture damper 9 in a longitudinal section. Within the fluid chamber 21, the piston 22 is mounted with the piston rod 17. Recognizable is a located outside the fluid chamber 21 return mechanism 26 in the form of two return springs, which are supported on the one hand to stops 24 of the housing 12, on the other hand on counter-stops 25 of the slider 13. By the return mechanism 26, the slider 13 after completion of the damping stroke back into one for the next standby stroke provided ready position to be reset. Of course, it is also possible to arrange a return spring in the interior of the fluid chamber 21, which is supported on the one hand at the bottom 30 of the fluid chamber 21 and on the other hand on the piston 22 and so pushes the piston 22 after attenuation back into the ready position. Reference numeral 40 denotes an overload safety device, by means of which at least one overload opening 41 in the piston 22 is evident above a threshold value of a pressurization on the furniture damper 9. This is made possible - as is known - by a spring-loaded ball 42, which releases the overload port 41 at a predetermined pressurization, so that in case of overload, the fluid in the fluid chamber 21 around the ball 42, through the overload channel 43 and finally into the rear fluid chamber 21a can flow.

FIG. 5 a shows a perspective sectional view of the piston 22, which can be screwed to a threaded portion 32 of the piston rod 17. The threaded portion 32 of the piston rod 17 is screwed into the opening 31 of the piston 22. For this purpose, the opening 31 of the piston 22 can be provided with a corresponding thread groove. Alternatively, it is also possible that the threaded portion 32 is formed at least partially self-tapping, wherein when screwing the piston rod 17 into the opening 31 of the piston 22, a thread groove in the piston 22 is einschneidbar. To detect the arranged in the piston 22 overload channel 43 through which the fluid can flow in case of overload, whereupon the fluid can flow through (not apparent here) grooves on the piston rod 17 past. Fig. 5b shows the mounting position, wherein the threaded portion 32 of the piston rod 17 is in engagement with the opening 31 of the piston 17.

6a also shows a perspective view of the piston 22, the piston rod 17 having projections 33 extending laterally instead of the threaded portion 32. In the exemplary embodiment shown, the piston rod 17 can be connected to the piston 22 via a bayonet closure, wherein the piston rod 17 can be inserted into the piston 22 and can be locked thereto by relative rotation relative to the piston 22. The projections 33 are inserted into axially extending grooves of the piston 22 and brought to a stop, whereupon the projections 33 screwed into either helical grooves of the piston 22 or alternatively by self-tapping projections 33 are screwed into the plastic material of the piston 17. Fig. 6b shows the embodiment of FIG. 6a in the assembled position.

FIG. 7 a shows a perspective view of the piston 22, wherein the piston rod 17 with its end region facing the piston 22 can be screwed into the piston 22 via a threaded section 32. The piston 22 has axially extending grooves 34, through which - even if the piston rod 17 is screwed into the piston 22 - the fluid flow over the overload passage 43 shown in Fig. 4 laterally past the piston rod 17 in the rear fluid chamber 21 a in case of overload can.

Fig. 7b shows the embodiment in which the piston rod 17 is connectable to the piston 22 via a bayonet closure. The projections 33 of the piston rod 17 are thereby first inserted into the corresponding grooves 34 of the piston 22 and brought to the end stop. Subsequently, the piston rod 17 relative to the piston 22 - preferably by about 90 ° - rotated, with the projections 33 cut into the plastic material of the piston, whereby the piston rod 17 relative to the piston 22 can be locked.

Fig. 8 shows a perspective view of the end of the piston 22, which faces the piston rod 17. Visible is the overload channel 43, which is connected to radially extending channels 35. These channels 35 finally open into the two lateral grooves 34, so that in case of overload, the fluid can flow through the overload channel 43, the radially extending channels 35 and the lateral grooves 34, even if the piston rod 17 is screwed to the piston 22.

The present invention is not limited to the embodiments shown, but extends to all variants and technical equivalents, which may fall within the scope of the following claims. Also, the location information chosen in the description, such as top, side, etc. related to the figure directly shown and are mutatis mutandis transferred to the new location in a change in position. The furniture damper 9 may also have a fastening device by which the furniture damper 9 is to be attached as a closed unit to a furniture body 2.

Claims

claims:

1. Furniture damper (9) for damping a movement of a movably mounted furniture part (3), with a fluid chamber (21) and a piston (22), wherein the piston (22) with a piston rod (17) is connected, characterized in that the piston (22) has an opening (31) in which the piston rod (17) is screwed.

2. Furniture damper according to claim 1, characterized in that the piston rod (17) at its the piston (22) facing region has a threaded portion (32) which in the opening (31) of the piston (22) can be screwed.

3. furniture damper according to claim 2, characterized in that the threaded portion (32) is at least partially self-tapping, wherein when screwing the piston rod (17) in the opening (31) of the piston (22) a thread groove in the piston (17) can be cut ,

4. Furniture damper according to one of claims 1 to 3, characterized in that the piston rod (17) in the assembled state does not protrude into the side remote from the piston rod (17) side of the piston (22) fluid chamber (21).

5. Furniture damper according to one of claims 1 to 4, characterized in _^ that the opening (31) in the piston (22) is a blind bore or a stepped bore.

6. Furniture damper according to one of claims 1 to 5, characterized in that the piston (22) is made of a plastic material.

7. Furniture damper according to one of claims 1 to 6, characterized in that the piston rod (17) consists of metal.

8. furniture damper according to one of claims 1 to 7, characterized in that the piston rod (17) with the piston (22) via a bayonet lock is connected, wherein the piston rod (17) in the piston (17) insertable and by relative rotation to the piston (22) can be locked with this.

9. furniture damper according to claim 8, characterized in that the piston (17) axially extending grooves (34) and that the piston rod (17) on its lateral surface projections (33), wherein the projections (33) of the piston rod (17) in the grooves (34) of the piston (22) can be inserted and wherein the projections (33) of the piston rod (17) by relative rotation of the piston rod (17) relative to the piston (22) can be locked.

10. furniture damper according to one of claims 1 to 9, characterized in that the piston (22) is arranged fixed in the mounting position and that the fluid chamber (21) during the damping stroke relative to the fixed piston (22) is mounted linearly displaceable.

11. furniture damper according to one of claims 1 to 10, characterized in that an overload protection (40) is provided by which above a threshold value of pressurization on the furniture damper (9) at least one overload opening (41) in the piston (22) is apparent.

12. Furniture damper according to claim 11, characterized in that the overload protection (40) has a spring-loaded ball (42) which releases the overload opening (41) in case of overload.

13. Furniture damper according to claim 11 or 12, characterized in that the overload opening (41) via an overload channel (43) with radially extending channels (35) of the piston (22) is connected, wherein the radially extending channels (35) in lateral grooves (34) of the piston (22) open, wherein in the event of overload, the fluid intended for damping flows through the overload channel (43), through the lateral grooves (34) and through the lateral grooves (34).

14. Furniture hinge with a furniture damper according to one of claims 1 to 13.