PIECE OF FURNITURE AND DEVICE FOR PUSHING OUT A FURNITURE PART
The invention proposes a piece of furniture and a device for pushing out a furniture part which is accommodated in a movable manner on a fixed furniture part, having a pushing-out lever which can be driven via a drive unit, is fitted on one of the two furniture parts and is temporarily in contact with the other furniture part in order to push out the movable furniture part, and the pushing-out lever has an abutment region within which the contact between the pushing-out lever and the other furniture part takes place, it being possible for the pushing-out lever to be driven, the intention being for the contact between the pushing-out lever and the other furniture part to be eliminated during a pushing-out operation. According to the invention, the abutment region has an inflection, and the pushing-out lever is designed to deform elastically during the pushing-out operation.
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This application is a continuation of International Application No. PCT/EP2008/003513 filed Apr. 30, 2008, which designated the United States, and claims the benefit under 35 USC §119(a)-(d) of German Application No. 20 2007 006 302.4 filed Apr. 30, 2007, the entireties of which are incorporated herein by reference.
FIELD OF THE INVENTIONThe invention relates to a device for pushing out a furniture part and a piece of furniture.
BACKGROUND OF THE INVENTIONDevices for pushing out a furniture part which is accommodated in a movable manner on a fixed furniture part are already known. The pushing-out operation can take place, for example, via a pivotable pushing-out lever which can be driven by a drive unit, is fitted on one of the two furniture parts and is temporarily in contact with the other furniture part in order to push out the movable furniture part. The movable furniture part may be a drawer, door, shutter or some other movable furniture part. The pushing-out lever comes into contact with the other furniture part, during the pushing-out operation, within an abutment region which is present on the pushing-out lever, contact being eliminated following the pushing-out operation.
Various requirements have to be met in the design of the pushing-out device. On the one hand, the pushing-out device should be as cost-effective, robust and space-saving as possible. On the other hand, it is sought to make it possible for the movable furniture part to execute comparable pushing-out movements, in particular even when it has to move, for example on account of variable loading, vastly different masses in each case.
SUMMARY OF THE INVENTIONThe object of the present invention is to improve a device of the type mentioned in the introduction in technical and economic terms and to provide a piece of furniture which has a corresponding device.
The invention is based, in the first instance, on a device for pushing out a furniture part which is accommodated in a movable manner on a fixed furniture part, having a pushing-out lever which can be driven via a drive unit, is fitted on one of the two furniture parts and is temporarily in contact with the other furniture part in order to push out the movable furniture part, and the pushing-out lever has an abutment region within which the contact between the pushing-out lever and the other furniture part takes place, it being possible for the pushing-out lever to be driven, the intention being for the contact between the pushing-out lever and the other furniture part to be eliminated during a pushing-out operation. It is an essential aspect of the invention that the abutment region has an inflection. It is thus possible, via the configuration of the abutment region on the pushing-out lever or by appropriate shaping of the pushing-out lever, to realize a desired profile for the pushing-out movement and/or advantageous pushing-out characteristics. In particular different effective lever lengths are thus achieved during the pushing-out operation by way of a relatively straightforwardly modified pushing-out lever. Different effective lever lengths also give rise to different forces and/or moments which can be transmitted to the other furniture part by the pushing-out lever during the pushing-out operation. This may be advantageous, in particular, when, for example at the beginning of the pushing-out movement, comparatively large forces and/or moments are necessary in order to be able to move the movable furniture part, in particular in order to overcome a standstill position in the closed state of the movable furniture part. A decisive effective lever length of the pushing-out lever here is one which is dependent on the lever geometry and/or on the type of inflection. It is thus possible here to realize a shorter lever length in a first phase of the pushing-out operation than at a later point in time of the pushing-out operation. The inflection in the abutment region will also provide contact with the other furniture part at the beginning of the pushing-out movement. It is thus advantageously possible for the furniture part which is to be moved to be subjected to forces and/or moments by the pushing-out lever for a pushing-out action. Furthermore, an inflection in the abutment region makes it possible for the pushing-out lever to be accommodated in a particularly space-saving manner. The inflection may describe a comparatively flat angle of inflection, for example on the side directed away from the abutment region, of between 120 and 170 degrees or below.
It is a further essential aspect of the invention that the pushing-out lever is designed to deform elastically during the pushing-out operation. Elastic bending at least of certain parts of the pushing-out lever, in particular of the abutment region, under load during the pushing-out operation can make it possible to influence the pushing-out operation, in particular the duration and magnitude of the forces and/or moments which can be transmitted by the pushing-out lever. The pushing-out operation can thus be adapted to different conditions, e.g. to different masses which have to be moved during the pushing-out operation. This can be achieved with a resiliently designed pushing-out lever since the latter, depending on the extent of elastic deformation during the pushing-out operation, and the change in this deformation over time, makes correspondingly different pushing-out actions possible. Depending on the magnitude of the mass which is to be moved here, it is possible to have different relationships between the proportions of the driven distance and of the non-driven, follow-on distance following the end of the driving action, in order always to obtain approximately the same pushing-out distance overall. The deliberately set-up, reproducible elasticity of the pushing-out lever, this elasticity having a marked effect on the pushing-out operation, makes it possible to realize, so to speak, a pushing-out action which adjusts automatically to different loadings or other variable boundary conditions of the movable furniture part.
The characteristics of the pushing-out operation which are dependent on the elasticity of the pushing-out lever may be influenced, for example, by different material properties of the elastically active part of the pushing-out lever or appropriate shaping or positioning of the elastically deforming regions of the pushing-out lever.
Furthermore, it is proposed that the pushing-out lever is designed such that a maximum change in position of one end of an elastic part of the pushing-out lever brought about by the elastic deformation during the pushing-out operation is at least 2%, in particular at least 5%, in relation to the length of the elastic part of the pushing-out lever. If we consider, for example, an elastic part of the pushing-out lever which bends around a fitting point, the length of the elastic part of the pushing-out lever is to be understood as approximately the distance between the fitting point and that end of the elastic part of the pushing-out lever which is remote from the fitting point. With, as proposed, elastic deformation of the pushing-out lever as a whole, and/or by way of elastically behaving sections of the pushing-out lever, it is possible to achieve, in a particularly reliable manner, desired self-adjustment of the pushing-out operations which is dependent on different boundary conditions, e.g. the magnitude of the masses which are to be moved.
The pushing-out lever is advantageously designed as an angled lever with, in the abutment region, an inflection by way of which two essentially rectilinear sections of the abutment region are oriented at an angle in relation to one another. An inflection, within the context of the invention, is understood to mean, in particular, that the abutment region is not curved, or such a profile should be avoided. Two sections which are essentially rectilinear in the region of inflection and are oriented at an angle in relation to one another allow the pushing-out lever to be designed in a relatively straightforward and space-saving manner. If appropriate, it is possible, for space-related reasons, for the inflection in a rectilinear pushing-out lever, which is rectilinear in particular in a starting position, to form only as the pushing-out operation begins or the pushing-out lever begins to pivot, for example, when the inflection is articulated.
An inflection makes it possible to realize a precise change in an effective lever length during a pushing-out movement. For example, a pushing-out lever with an inflection in the abutment region can provide for a first effective lever length in a first phase of the pushing-out movement and for a further effective lever length as the pushing-out movement of the pushing-out lever progresses.
Moreover, it is preferred if the pushing-out lever has a part which behaves essentially rigidly during the pushing-out operation and a part which deforms elastically during the pushing-out operation and comprises, in particular, the abutment region. The pushing-out lever can thus be adapted particularly straightforwardly to different desired pushing-out profiles. The coordination of the elastically deforming part and of an essentially rigid part of the pushing-out lever means that the pushing-out lever can subject the other furniture part to markedly different forces which act during the pushing-out operation. Moreover, automatic adaption of the pushing-out lever can be achieved during the pushing-out operation. It is, for example, also possible for a rigid basic body of the pushing-out lever, depending on the elasticity desired, to have different elastically deforming parts of the pushing-out lever fitted on it. The two parts may be separate components or may be formed integrally.
Furthermore, it is proposed that the abutment region of the pushing-out lever is designed with multiple inflections. A multiple-inflection arrangement or a polygonal shape of the abutment region can make possible a multiply extending effective lever length as the lever movement continues during the pushing-out operation.
It is particularly advantageous if an inflection in the abutment region is configured rigidly, in which case there is no change, during the pushing-out operation, in an angle of inflection formed by the relevant inflection. It is thus possible for the pushing-out lever to be produced, in particular, straightforwardly and to be comparatively stable.
As an alternative, it may be advantageous for an inflection in the abutment region to be designed such that it can be changed elastically under load. In particular the inflection in the abutment region may be designed such that it can be changed elastically under load so that, during the pushing-out operation, a change in an angle of inflection formed by the relevant inflection can take place. The angle of inflection can be changed, for example, by one or more inflections being articulated. It is thus also possible, for example, in a standby position before or after a pushing-out operation, for the pushing-out lever to straighten out completely, which is a relatively space-saving maneuver. Moreover, when a limit loading to which the pushing-out lever is subjected is exceeded, this pushing-out lever can yield if appropriate at the points of inflection, as a result of which damage can be prevented.
It is a further essential aspect of the invention that the pushing-out lever is configured in order to allow a pushing-out operation in the manner of a toggle mechanism. A toggle mechanism makes it possible, in particular with an acute toggle angle, to transmit high forces to a furniture part which is to be moved. Moreover, a toggle mechanism can be accommodated in a particularly space-saving manner in a straightened-out position.
It is advantageous here in particular if the pushing-out lever comprises a toggle which is fitted on one of the furniture parts and has limbs which can be angled in relation to one another in a head section, the head section coming into direct abutment against the other furniture part during the pushing-out operation. This makes it possible to realize a particularly effective transmission of forces to the other furniture part during the pushing-out operation.
Moreover, it is advantageous to provide an overload-prevention means which is intended for the toggle mechanism and allows the pushing-out lever to yield counter to a movement which is necessary for the pushing-out operation. In the case of the furniture part which is to be moved being subjected to unforeseen or briefly occurring pronounced mechanical loading counter to a pushing-out direction, it is possible to avoid damage to the toggle mechanism and/or to a furniture part.
The invention further comprises a pushing-out lever which is, in particular, telescopic. It is thus conceivable for the lever to be movable with driving action and to have telescopic sections which can be rotated in relation to one another. The lever can be telescoped via, for example, a rotary guide or a helical groove with engagement sections running therein. For example, a pushing-out lever may comprise a plurality of pushing-out lever elements which are nested one inside the other in the manner of cups, can be telescoped in relation to one another by rotation and can be accommodated in a compact manner or extended.
The invention additionally relates to a piece of furniture with a movable furniture part which is accommodated in a movable manner on a fixed furniture part, a device like that explained above being provided. The advantages disclosed can thus also be achieved for a corresponding furniture part.
For safety reasons, it is necessary, in the event of a false start of the system, for the movable furniture part of the latter, e.g. a drawer, not to extend or, in the event of overloading, for the extending operation of the drawer to be interrupted. Since, in most cases, such errors are based on an error in the control means, the appropriate safety-related intervention must not take place by way of defective control means. This is done by the lever being of two-part design and the two parts being connected to a rotary articulation. The torques which occur in this rotary articulation are safeguarded mechanically preferably via an elastic spring. An elastic spring has the advantage that the envisaged spring force need only be achieved briefly in order for the profile shape of the elastic spring to be changed such that a much weaker leaf-spring profile is no longer able to support the rest of the torques and the cam cycle can be readily brought to an end. If the system moves into the basic position, and the top dead center is passed, the elastic spring can force the two lever parts back into the original position again as a result of the spring loading being eliminated.
It is advantageous in principle in the case of the proposed arrangement if, irrespective of the method of fitting the movable furniture part on the fixed furniture part, the pushing-out device can be fitted universally and/or can be easily retrofitted. In particular there is no need to take any additional measures for locking the movable furniture part in the closure position, since the movable furniture part can be retained in the closure position via conventional locking means, e.g. an automatic retraction mechanism.
Furniture parts are to be understood predominantly as furniture parts for kitchen furniture and furniture for the home in general, but the expression furniture parts, within the context of the invention, may also extend to drawers, doors and shutters on other arrangements, for example to a drawer on a tool cabinet or carriage.
By way of the figures, further details and features of the invention will be explained in more detail using highly schematically illustrated exemplary embodiments. The figures use partially the same designations for corresponding components of different exemplary embodiments.
The front gap serves predominantly, by virtue of someone or something pushing on the front portion 3a, to allow a triggering command for a pushing-out operation in which the drawer 3 can be moved a few millimeters in the direction of the basic structure 2, with the front gap 5 being reduced in the process. A triggered pushing-out operation is executed by a pushing-out device 6 according to the invention. If, in the state shown in
The pushing-out device 6 is clipped in releasably over the two crossmembers 8a and 8b. The two crossmembers 8a, 8b are themselves accommodated in accommodating flanges 9a and 9b which are fastened on the side walls of the basic furniture structure 2.
The pushing-out device may also be fastened on the drawer 3 and moved along therewith, in which case the pushing-out lever 7 can come into contact, for example, with the rear wall of the basic structure 2 at least for pushing-out purposes.
Following the pushing-out operation, the pushing-out lever 7 is pivoted back immediately, or shortly thereafter, into its rest position again, as shown in
The pushing-out device 6 which is shown in
An inflection-formed angle a (
Two further exemplary embodiments of the pushing-out device 6 are illustrated in
On an abutment side 7a, which comes into contact with a furniture section during the pushing-out operation, the pushing-out lever 7 is of rectilinear design over more or less its entire length, and it is rounded in a front end section.
The pushing-out device 6 according to
Individual steps of the operation as a whole are illustrated in
For overload prevention, it is possible, when an in particular predeterminable resistance to the pushing-out movement and/or the pushing-out lever 7 has been reached, for the direction of rotation of the control wheel 11 to be reversed, e.g. when an individual is standing in front of the movable furniture part or is standing in the path over which this furniture part can move during the pushing-out operation.
In order to be fitted on crossmembers, the pushing-out device 6 is provided with, for example, four fitting clips 16 arranged externally in corner regions.
The pushing-out lever 7 is pivoted forward and back about the axis of rotation R via the electric motor 13a and the gear mechanism 14. The gear mechanism 14 and further gear-mechanism or transmission elements 18, 19 and 20 are provided for transmitting the rotary movement to the pushing-out lever 7, and they cause a rotary shaft 21, which is fixed in position on the pushing-out lever 7, to rotate. On its abutment side, on which contact can be made, during the pushing-out operation, with a section of a furniture part which is subjected to the action of the pushing-out lever 7, the pushing-out lever 7 is provided with a rectilinear section G and a section K which is curved or convex at the front and is formed merely in the region of the front half of the length of the pushing-out lever 7. During the pushing-out operation, a position of the point of contact can move in the longitudinal direction of the pushing-out lever 7 essentially in the section K.
In
A sensor is provided for sensing a movement state or a pivoting movement of the pushing-out lever 7, and this sensor has a sensor part 22a on a basic body of the pushing-out device 6 and a further sensor part 22b on a correspondingly positioned section of the pushing-out lever 7. The sensor parts 22a, 22b may be, in particular, parts of a Hall sensor.
A further pushing-out lever according to the invention will be explained with reference to
For overload prevention of the toggle 24, or of the toggle arrangement 23, with the toggle limbs 26 and 27 angled in an articulated manner, for example when a force in the direction of the arrow P1 (see
An alternative embodiment of the pushing-out device according to the invention with a bending lever 34 will be explained in more detail with reference to
The lever element 37 has, at its front end, a bent-over abutment section 37a which, during the pivoting operation, can come into abutment with a mating section, for example with a rear wall of a drawer. At its end positioned opposite the abutment section 37a, the lever element 37, having been bent over, is guided back a little and accommodated between the housing parts 35a, 35b. The bent-over end of the lever element 37 has supported on it an angled plate 38 of the supporting foot (see
In
To give an understanding of the overload-prevention means according to
The pushing-out device 6 is provided with a control wheel 11, as has already been explained in more detail above, in order to pivot the bending lever 34.
An elastically deformable part 40 of the pushing-out lever 7 butts against the rear wall 3b of the drawer 3, the elastic part 40 acting on a rigid part 39 of the pushing-out lever 7. The pushing-out lever 7 can be pivoted about a pivot axis S via a cam plate 42 which can be moved with driving action via a drive unit. Other parts in particular of the pushing-out device 6, for example the drive unit, are not illustrated. As the cam plate 42 is driven in rotation about the eccentrically positioned axis of rotation R, a roller 15a on a supporting foot 15 of the rigid part 39 is supported on an encircling or closed guide path 42a, which is formed by a radially outer narrow side of the cam plate 42. The rotation of the cam plate 42, in this case for example in the clockwise direction, pivots the rigid part 39 of the pushing-out lever 7 and, along therewith, an elastic part 40 of the pushing-out lever 7. The elastic part 40 here pushes against the rear wall 3b of the drawer 3, which is thus pushed out. The pivoting movement of the pushing-out lever 7 can be determined by the sustained support of the supporting foot 15, via the roller 15a, on the guide section which is guided in rotation past the same, or the guide path 42a of the cam plate 42. This gives rise in particular to the pushing-out lever 7 pivoting uniformly as it pushes against the rear wall 3b and pivoting back comparatively quickly following the actual pushing-out operation. The guide path 42a may be formed in various ways, for example, as illustrated, from two more or less rectilinear sections which are connected to one another via two curved sections, the axis of rotation R being located relatively far outward in the vicinity of a transition from a rectilinear section to a curved section.
An alternative embodiment of a pushing-out lever in a position according to
- 1 Piece of furniture
- 2 Basic structure
- 2a Rear wall
- 2b Side wall
- 2c Side wall
- 3 Drawer
- 3a Front portion
- 3b Rear wall
- 4 Pull-out guide
- 5 Front gap
- 6 Pushing-out device
- 7 Pushing-out lever
- 7a Abutment side
- 8a Crossmember
- 8b Crossmember
- 9a Accommodating flange
- 9b Accommodating flange
- 10 Supporting pin
- 11 Control wheel
- 11a Guide path
- 11b Outer toothing formation
- 12 Basic frame
- 13a Electric motor
- 13b Electric motor
- 14 Gear mechanism
- 15 Supporting foot
- 15a Roller
- 16 Fitting clip
- 17 Bearing element
- 18 Transmission element
- 19 Transmission element
- 20 Transmission element
- 21 Rotary shaft
- 22a Sensor part
- 22b Sensor part
- 23 Toggle arrangement
- 24 Toggle
- 25a Fitting jaw
- 25b Fitting jaw
- 26 Toggle limb
- 27 Toggle limb
- 28 Carriage component
- 29 Accommodating component
- 30 Drive spindle
- 31 Intermediate component
- 32a Spring
- 32b Spring
- 33a Crossmember
- 33b Crossmember
- 34 Bending lever
- 35a Housing part
- 35b Housing part
- 36a Connecting pin
- 36b Connecting pin
- 36c Connecting pin
- 37 Lever element
- 37a Abutment section
- 38 Plate
- 39 Rigid part
- 40 Elastic part
- 41 Inflection
- 42 Cam plate
- 42a Guide path
Claims
1. A device for pushing out a furniture part which is accommodated in a movable manner on a fixed furniture part, comprising a drive unit, a pushing-out lever driven via the drive unit and being fitted on one of the two furniture parts in temporary contact with the other furniture part in order to push out the movable furniture part, the pushing-out lever having an abutment region within which contact between the pushing-out lever and the other furniture part takes place, wherein the pushing-out lever is driven and then contact between the pushing-out lever and the other furniture part is eliminated during a pushing-out operation, and wherein the abutment region has an inflection.
2. A device for pushing out a furniture part which is accommodated in a movable manner on a fixed furniture part, comprising a drive unit, a pushing-out lever driven via the drive unit and being fitted on one of the two furniture parts in temporary contact with the other furniture part in order to push out the movable furniture part, the pushing-out lever having an abutment region within which contact between the pushing-out lever and the other furniture part takes place, wherein the pushing-out lever is driven and then contact between the pushing-out lever and the other furniture part is eliminated during a pushing-out operation, wherein the abutment region has an inflection, and wherein the pushing-out lever deforms elastically during the pushing-out operation.
3. The device as claimed in claim 1, wherein a change in position of one end of an elastic part of the pushing-out lever brought about by the elastic deformation during the pushing-out operation is at least 2% in relation to the length of the elastic part of the pushing-out lever.
4. The device as claimed in claim 1, wherein a change in position of one end of an elastic part of the pushing-out lever brought about by the elastic deformation during the pushing-out operation is at least 5% in relation to the length of the elastic part of the pushing-out lever.
5. The device as claimed in claim 1, wherein the pushing-out lever is an angled lever with, in the abutment region, the inflection by way of which two essentially rectilinear sections of the abutment region are oriented at an angle in relation to one another.
6. The device as claimed in claim 1, wherein the pushing-out lever has a part which behaves essentially rigidly during the pushing-out operation and a part which deforms elastically during the pushing-out operation and comprises the abutment region.
7. The device as claimed in claim 1, wherein the abutment region of the pushing-out lever is designed with multiple inflections.
8. The device as claimed in claim 1, wherein the inflection in the abutment region is configured rigidly, in which case there is no change, during the pushing-out operation, in an angle of inflection formed by the relevant inflection.
9. The device as claimed in claim 1, wherein the inflection in the abutment region is designed such that it can be changed elastically under load.
10. A device for pushing out a furniture part which is accommodated in a movable manner on a fixed furniture part, comprising a drive unit, a pushing-out lever driven via the drive unit and being fitted on one of the two furniture parts in temporary contact with the other furniture part in order to push out the movable furniture part, the pushing-out lever having an abutment region within which contact between the pushing-out lever and the other furniture part takes place, wherein the pushing-out lever is driven and then contact between the pushing-out lever and the other furniture part is eliminated during a pushing-out operation, wherein the abutment region has an inflection, and wherein the pushing-out lever is configured to allow a pushing-out operation in the manner of a toggle mechanism.
11. The device as claimed in claim 10, wherein the pushing-out lever comprises a toggle which is fitted on one of the furniture parts and has limbs which are angled in relation to one another in a head section, the head section coming into direct abutment against the other furniture part during the pushing-out operation.
12. The device as claimed in claim 10, further comprising an overload-prevention mechanism for the toggle mechanism to allow the pushing-out lever to yield counter to a movement which is necessary for the pushing-out operation.
13. A piece of furniture with a movable furniture part which is accommodated in a movable manner on a fixed furniture part, comprising a device as claimed in claim 1.
14. A piece of furniture with a movable furniture part which is accommodated in a movable manner on a fixed furniture part, comprising a device as claimed in claim 2.
15. A piece of furniture with a movable furniture part which is accommodated in a movable manner on a fixed furniture part, comprising a device as claimed in claim 10.
Type: Application
Filed: Oct 29, 2009
Publication Date: Apr 8, 2010
Applicant: Grass GmbH (Hochst)
Inventors: Klaus SCHNEIDER (Hochst), Harry GEHRER (Hochst)
Application Number: 12/608,365
International Classification: A47B 88/12 (20060101); A47B 88/04 (20060101);