The invention concerns a furniture damper for damping a movement of a movably mounted furniture part or a movably mounted furniture fitting component of a furniture fitting, comprising a piston arranged in a fluid chamber, wherein a damping action is performed by a relative movement between the fluid chamber and the piston, and comprising a sealing device for sealing the fluid chamber, wherein the sealing device has a first abutment element and a second abutment element which is mounted movably relative to the first abutment element and which is adapted to seal the fluid chamber, and wherein a spring is arranged between the first abutment element and the second abutment element.
A furniture fitting having a furniture damper for damping a movably mounted furniture part, wherein a damping action is performed by a movement of a piston in a fluid chamber, is disclosed in WO 2009/003458, wherein a movably mounted seal is acted upon by means of a spring which bears against the end plate of the fluid chamber. The spring serves in that case for guiding the movably mounted seal and is held by means of projections both against the seal and also against the end plate. In the intermediate region the spring is of a constant cross-section and occupies the entire interior of the housing in which the fluid chamber is arranged, to permit guidance for the seal, that is as stable as possible. The disadvantage of such a furniture fitting is that the nature of the spring and the projections take up a great deal of space and the range of movement of the seal is limited, whereby use is conceivable only for large furniture fittings where there is sufficient space. The advantages of a movably mounted seal, as are described in GB 565 630, cannot be enjoyed in that respect for every kind of furniture fittings.
Therefore the object of the present invention is to provide a furniture damper of the general kind referred to in the opening part of this specification, which avoids the above-indicated disadvantages.
That is achieved by a furniture damper having the features of claim 1.
A furniture damper of the kind referred to in the opening part of this specification has the advantages that the abutment elements, which are mounted movably relative to each other, of the sealing device provide additional space for the damping stroke movement per se and as volume compensation in the course of a damping process when a relative movement takes place between the fluid chamber and the piston and in that case a fluid is pressed for example as a damping liquid, for example silicone oil, through openings provided for same, from a first region of the fluid chamber into a second region of the fluid chamber. The damping action occurs due to the resistance opposed to the fluid movement by the through openings, as in the case of a conventional fluid damper. The first and second abutment elements are acted upon by the spring disposed between the abutment elements so that, as a consequence of a relative movement of the abutment elements, compression or extension of the spring occurs and the abutment elements which are mounted movably relative to each other are returned to their starting position again.
In addition the beginning and the end of the damping process can be initiated with less of a jerk and more gently, due to the spring-loaded sealing device. The characteristic curve of damping of the damper in itself, which is afforded by the damping force generated during a damping action, becomes smoother due to the movably mounted seal.
According to the invention it is now provided that the spring can be compressed between the first and second abutment elements substantially to the cross-sectional thickness of the spring or the spring coils, whereby there is more damping travel with the same structural size or overall the structural size of the furniture damper is reduced in total in comparison with furniture dampers in the state of the art as, with a given additional compensating volume, due to the movably mounted sealing device, which volume is afforded by the extension and compression of the spring from its neutral position, the first and second abutment elements are compressible to a smaller mutual spacing by virtue of the nature according to the invention of the spring. As a result the structural height of the sealing device turns out to be less than in the state of the art. The cross-sectional thickness of the spring or the spring coils is used to mean the cross-sectional diameter of the spring wire or the spring strip from which the spring or the spring coil is made.
In addition it is possible for the volume of the compensating space which is additionally made available to be maximised by the spring according to the invention, without having to forego the advantages of a spring loading.
Further advantageous configurations of the invention are defined in the appendant claims.
In a particularly preferred embodiment of the invention the spring is a conical spiral spring. A conical spiral spring is distinguished in that the projection of the spring coils on to a plane perpendicularly to the longitudinal axis of the spring represents a spiral. Compression of the conical spiral spring permits the spring coils to be arranged one within the other so that the compressed spring forms a spiral, whereby the lengthwise extent of the compressed spring substantially corresponds to the cross-sectional thickness of the spring or the spring coils. The individual coils of the conical spring are of a spiral configuration and therefore increase in diameter. The coils of smaller diameter are pushed into the coils of larger diameter, when the spring is compressed. Upon compression of the spring to its cross-sectional thickness, all coils are pushed into the coil of largest diameter, which is arranged at the base of the conical spring. The cross-sectional thickness of the spring is given here by the cross-sectional diameter of the spring wire or spring strip of the largest coil diameter.
It is preferably provided that the spring has a central opening in which the piston or a piston rod connected to the piston is arranged so that in the mounted condition of the furniture damper the spring coils are arranged around the piston or piston rod. In that way the spring is guided during the movement of the first abutment element relative to the second abutment element, by the piston or the piston rod.
In a further embodiment of the invention the first abutment element has a contact surface against which in the mounted condition of the spring a first end of the spring bears and the spring is thereby supported against the first abutment element. In that way it is possible to dispense with projections in the abutment element for fixing the spring, which require a large amount of space. Additionally or alternatively the second abutment element can have an abutment surface against which a second end of the spring bears in the mounted condition of the spring, whereby the spring is supported against the second abutment element. In that way it is possible to dispense with projections on the second abutment element, that require a large amount of space and serve to mount the spring. The abutment elements are acted upon by the spring by way of the abutment surface or surfaces. A relative movement of the abutment elements with respect to each other is transmitted to the spring by way of the abutment surface or surfaces of the abutment elements.
During the damping process the relative movement between the fluid chamber and the piston is transmitted to the abutment elements so that they are also moved relative to each other whereby the spring is compressed between the abutment elements. In that respect the spring is of such a design that, as a consequence of a maximum damping stroke, the second and the first abutment elements assume a minimum spacing relative to each other and the spring disposed between the abutment elements is compressed substantially to the cross-sectional thickness of the spring or spring coils. As a subsequent consequence the spring stretches to its neutral position again and transmits that movement to the abutment elements so that they again assume a greater spacing from each other and are returned to their starting position.
In a further embodiment of the invention the second abutment element has a sealing element which has sealing lips which in the mounted condition bear against the piston or a piston rod connected to the piston and additionally or alternatively against the wall of a housing surrounding the fluid chamber and thereby seal off the fluid chamber. In that case the sealing integrity prevents the fluid in the fluid chamber from escaping therefrom. It is preferably provided in that respect that the fluid chamber is enclosed by a housing having an open end. The sealing integrity afforded by the sealing device, in particular by the sealing element with the sealing lips, closes off the fluid chamber in relation to the open end.
The invention further concerns a furniture hinge having a furniture damper as described above.
It is preferably provided in that respect that the furniture hinge has a carcass-side fitment portion and a hinge cup hingedly connected thereto for fixing furniture parts, wherein in the mounted position the furniture damper is arranged substantially completely within the hinge cup. Instead it can also be provided that the furniture damper can be fitted from above into the hinge cup and can be arranged within the hinge cup. In that case the fitment portion and the hinge cup can already be hingedly connected together. The furniture damper can be connected to the hinge cup by way of co-operating fixing means in that mounted position.
The space within a hinge cup is generally very small as hinge cups are arranged in side walls of furniture carcasses or in doors which close furniture carcasses. The advantage of furniture dampers arranged in hinge cups is that no space is occupied within the furniture carcass by the arrangement of the damper. However very high demands are made on furniture dampers which are arranged in hinge cups, in regard to the small size of the components to be used. For that reason a furniture damper according to the invention which has a spring between a first and a second abutment element, which spring can be compressed substantially to the cross-sectional thickness of the spring, is of particular advantage.
The invention further concerns a furniture damper for damping a movement of a movably mounted furniture part or a movably mounted furniture fitting component of a furniture fitting, comprising a piston arranged in a fluid chamber, wherein a damping action is performed by a relative movement between the fluid chamber and the piston, and comprising a sealing device for sealing the fluid chamber, wherein the sealing device has a first abutment element and a second abutment element which is mounted movably relative to the first abutment element and which is adapted to seal the fluid chamber and wherein the piston assumes a first end position at the end of the damping stroke relative to the fluid chamber, wherein there is provided a return spring by which the relative position of the piston relative to the fluid chamber is displaceable into a readiness position remote from the end position, wherein the return spring is arranged between the first and second abutment elements.
The furniture damper in that case is of the above-described configuration, wherein the spring which serves for the return movement of the relative position of the first and second abutment elements and which is arranged between the first and second abutment elements additionally serves to return the relative position of the piston relative to the fluid chamber. In that case the spring disposed between the first and second abutment elements can support or completely replace a further return spring or springs serving to return the relative position of the piston relative to the fluid chamber.
In the last-mentioned case the spring arranged between the first and second abutment elements must have a spring constant such that not only can the abutment elements be returned, but the relative position of the piston relative to the fluid chamber can also be returned to the readiness position after the conclusion of a damping process so that the furniture damper is ready for use for a fresh damping process. In that respect it can again be provided that the spring can be compressed substantially to the cross-sectional thickness of the spring by the relative movement of the first and second abutment elements.
The invention further concerns a furniture hinge having a furniture damper with a return spring as described above. In a particular embodiment the furniture hinge has a carcass-side fitment portion and a hinge cup hingedly connected thereto for fixing furniture parts. In that case in the mounted position the furniture damper is arranged substantially completely within the hinge cup or can be inserted from above into the hinge cup when the fitment portion and the hinge cup are already hingedly connected together, and it can be arranged within the hinge cup. The furniture damper can be connected to the hinge cup by way of co-operating fixing means in that mounted position.
Further details and advantages of the present invention are described more fully hereinafter by means of the specific description with reference to the drawings in which:
a and 2b show perspective views of a furniture hinge with a furniture damper to be arranged in the hinge cup,
a through 3c show the furniture damper as an exploded view, an enlarged detail view of the slider and the arresting element as a perspective view from below,
a and 4b show perspective views in longitudinal section through the furniture damper in various positions of the piston relative to the fluid chamber,
a and 5b show the views of
a and 6b show a partly broken-away perspective view through a furniture hinge with a furniture damper integrated in the hinge cup, and a detail view thereof,
a and 8b show a plan view of a longitudinal section through the furniture damper and an enlarged detail view thereof,
a and 9b show the views of
a and 10b show the views of
a through 11e show various views of a conical spiral spring according to the invention.
a shows a perspective view of a furniture hinge 4, wherein the hinge cup 6 is connected pivotably by way of at least one hinge lever 7 to the fitment portion 5 in the form of a hinge arm 5a. The furniture hinge 4 can be moved into the completely closed position and/or into the completely open position by way of a spring device 8. For damping that spring-assisted movement into the end position or positions, there is provided a furniture damper 9 having a housing 12 and a slider 13 movable relative thereto. The furniture damper 9 is either already fitted in the factory into the internal cavity 10 in the hinge cup 6 or alternatively—with the fitment portion 5 and the hinge cup 6 assembled—the furniture damper 9 can be retro-fitted from above into the hinge cup 6 and arranged within the hinge cup 6, in which case the furniture damper 9 can be releasably connected together in that mounted position by way of co-operating fixing means 11a, 11b. In the illustrated embodiment the furniture damper 9 has first fixing means 11a in the form of a guide groove, which can be releasably connected to fixing means 11b arranged in the hinge cup 6 and in the form of a fixing projection. The furniture damper 9 has an introduction opening 14 through which the fixing projection 11b can be arranged in the guide groove 11a. To deactivate the damping function the furniture damper 9 has a locking device 15 with a displaceable arresting element 15a in the form of a switch member, by which the slider 13 can be releasably arrested in the position of being completely pressed in.
b shows a perspective view of the furniture hinge 4 with the furniture damper 9 in the mounted position. The furniture damper 9 is arranged completely in the internal cavity 10 in the hinge cup 6. In the closing movement of the furniture hinge 4 the hinge lever 7 encounters the slider 13, whereby the damping process is initiated. In the course of the further closing movement the slider 13 can be pressed relative to the housing 12 into a complete end position, wherein that end position can be releasably arrested by the locking device 15. The slider 13 can no longer be returned in the arrested position, in which case therefore the damping action is deactivated.
In the exploded view in
Provided in the interior of the slider 13 is at least one fluid chamber in which at least one piston (not visible here) with a piston rod 17 is displaceably mounted. It is possible clearly to see the fixing means 11a in the form of guide grooves on both sides, by which the slider 13 is displaceable in the damping stroke movement relative to the fixing projections 11b of the hinge cup 6. The fixing projection 11b can be arranged in the guide groove 11a through the introduction opening 14. The housing 12 has a mounting 18 to which the piston rod 17 is to be fixed.
Arranged on the slider 13 is a first securing element 19 which can be secured in the pressed-in end position of the slider 13 relative to a second securing element 20 arranged on the switch 15a.
b shows an enlarged detail view of the slider 13, on which a first securing element 19 in the form of a resilient tongue is provided.
a shows a perspective view in longitudinal section through a furniture damper 9. It is possible to see the slider 13 in which there is a fluid chamber 21, in which a piston 22 with a piston rod 17 is mounted, being arranged stationarily in the illustrated embodiment. In the closing movement of the furniture hinge 4 the hinge lever 7 (
The housing of the slider 13 has an open end which is closed by a first abutment element 27 in the form of a cover plate. The first abutment element 27 has an opening for the piston rod 17. The spring 26 in the form of a conical spiral spring is arranged around the piston rod 17. A first end of the spring 26 bears against the abutment surface of the first abutment element 27 and in that case is supported on the first abutment element 27. The narrower second end of the spring 26 bears against an abutment surface of the first abutment element 27 and is supported thereat. The second abutment element 28 has a sealing element 29 having an outer sealing lip 31 and an inner sealing lip 32. The outer sealing lip 31 serves to seal off the fluid chamber 21 in the region of the housing wall of the slider 13 and bears thereagainst. The inner sealing lip 32 serves to seal off the fluid chamber 21 in the region of the piston rod 17 and for that purpose bears thereagainst.
b shows a plan view of the longitudinal section in
a and 4b show the furniture damper 9 prior to initiation of a damping process by the hinge lever 7. The furniture damper 9 is in the readiness position. In that case the fluid arranged in the region at the left of the piston 22 in the fluid chamber 21 is urged into the region to the right of the piston 22 by way of through openings, whereby a damping effect occurs. The sealing element 29 with the outer and inner sealing lips 31, 32 prevents the fluid from passing through into the additional compensating space 33 between the first and second abutment elements 27, 28. That additional compensating space 33 serves as an additional damping stroke and by way of the spring 26, permits a more gently matched damping action. The return spring 30 which is not shown in
a and 5b again show the furniture damper 9 as a perspective view (
a shows a cross-section of a furniture hinge 4 with the furniture damper 9 in the mounted position. The furniture hinge 4 has a fitment portion 5 which is in the form of a hinge arm 5a—and which is preferably L-shaped—and which is connected pivotably to the hinge cup 6 by way of a hinge lever 7. The hinge lever 7 is mounted pivotably about an axis of rotation 23 at the furniture cup side.
a corresponds in principle to
a and 9b show the components of
a and 10b show the components of
a and 11b show the spring 26 in the form of a conical spiral spring as perspective views in its neutral position (
That can also be clearly seen from the side view in
e again shows a plan view of the spring 26 where it can be seen that the projection of the spring 26 on to a plane perpendicular to the longitudinal axis is in the form of a spiral, independently of the compression condition. It will be seen that the spring coils of the spring are of such a configuration that they can be pushed one into the other.
In the illustrated drawings the return of the slider 13 is implemented by way of return springs 33. It is however also possible to permit that return movement by the spring 26, in which case the spring 26 can support or entirely replace the return springs 33.
The present invention is not limited to the illustrated embodiment but extends to all variants and technical equivalents which can fall within the scope of the appended claims. The positional references adopted in the description such as for example up, lateral, and so forth are also related to the directly described Figure and are to be appropriately transferred to the new position upon a change in position.
Number | Date | Country | Kind |
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A 1438/2010 | Aug 2010 | AT | national |
Number | Date | Country | |
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Parent | PCT/AT2011/000353 | Aug 2011 | US |
Child | 13775399 | US |