EP2142043B1 - Piece of furniture, and mechanism for ejecting a furniture part movably received on a stationary furniture part - Google Patents

Description

The invention relates to a device according to claim 1 and a furniture according to claim 11.

State of the art

Devices for ejecting a movable furniture part, in particular to a drawer, door, flap or the like from a closed position to a stationary furniture part driven over a partial distance moved out, are known. In this case, a movable furniture part of a piece of furniture can be moved, for example, driven by a comparatively short distance, in order subsequently to be moved on manually by a person. For example, it can be made comfortably possible in a drawer to operate the drawer by being moved out of a closed position or from a retracted position in a carcass by means of a driven ejection element, for example by about 30 to 70 millimeters. As a result, the drawer does not have to be set in motion manually from a standstill position, which can make a not inconsiderable expenditure of energy, especially for heavily loaded drawers. The slowly moving partially opened drawer can then be moved without special effort or can then Conventionally manually further opened or closed again. For this purpose, for example, a drivable via a drive unit ejection element can be used.

From the EP 0 766 939 A For example, an opening / closing device of a movable element is known, wherein the element is movable with respect to another element. The opening or closing device is directed in particular to a drawer movable on ball guides.

Another opening device is off WO 2006/017864 known.

Purpose and advantages of the invention

Object of the present invention is to provide a corresponding piece of furniture or a device of the type mentioned, with an increased ease of use for a furniture is made technically or economically advantageous.

This object is solved by the claims 1 and 11. In the dependent claims advantageous developments of the subject invention are listed.

The invention is initially based on a device for ejecting a furniture part, which is movably received on a stationary furniture part, with a driven by a drive unit ejection element which is attached to one of the two furniture parts and temporarily in contact with the other furniture part to the movable To eject furniture part, wherein the ejection element is driven, with the intention that during a discharge operation, the contact between the ejection element and the other furniture part is canceled. An essential aspect of the invention is in that means are provided to realize a driving action on the ejection element, which changes automatically depending on the ejection behavior of the movable furniture part. The invention is particularly advantageous in that the drivable ejection element, which is pivotable or displaceable for example, makes it possible, independently of a mass to be moved, to eject the movable furniture part, To drive this so that by the ejection process in all practice-relevant cases, the ejected furniture part has a desired or in particular comparable movement characteristics by the ejection process. Any movable furniture part, for example a furniture drawer which can be moved relative to a stationary furniture body, can be ejected according to the invention with the drivable ejection element adapted to customer requirements, for example by adapting the applied drive effect. The vote can be adjusted automatically, for example, to a greatly varying loading of the drawer. Thus, in particular heavily loaded drawers can be ejected so that afterglow always ends at approximately the same point or the drawer travels to a point in which stops when ejecting the slightly loaded drawer. As a measure according to the invention, for example, the ejection speed can be adjusted for different loading conditions. Advantageously, the ease of use for corresponding movable furniture parts can be increased. Because for the user, it is usually desirable that the movable furniture part is always moved by the same ejecting process, in particular so accelerated that always the same or almost the same standstill point is reached. The movable furniture part can be opened as usual, especially by hand or subsequently closed by hand again.

An ejected movable furniture part is usually after the contact between the ejection element and the other furniture part or the portion on which the ejection element acts, run by the speed achieved thereby to a standstill of the movable furniture part still not driven. The length of the distance of the wake can be adjusted according to the invention.

Differences in the movement pattern in the case of unmatched ejection arise in the case of different loading conditions of a drawer, in particular in that a drawer guide can deflect due to the weight load on a loaded drawer, whereas in the case of an unloaded or only slightly loaded drawer, the drawer slides along e.g. a slight slope moves. By contrast, a more heavily loaded drawer moves through the deflection of the guide along an inclined guide. The unloaded or barely loaded drawer therefore requires a comparatively greater output speed in such contexts than a comparatively heavily or fully loaded drawer. This circumstance can be taken into account with the means according to the invention.

It is further proposed that the movable furniture part is caused by the ejection process to cover a predetermined ejection path to the standstill of the movable furniture part. Thus, for example, in the ejection process, the movable furniture part can be accelerated so that the entire discharge path is the same, the entire discharge path of a first part-way during contact with the ejection element and a further part-way after the lifting of the Contact with the ejection element composed to a standstill.

In principle, different options can be implemented with the proposed means for achieving the goals. On the one hand, a drive power applied to the movable furniture part during contact with the ejection element can be changed, or with constant drive power, for example, the duration of the applied drive power can be set from the ejection element to the other furniture part or varied variably. For this necessary rule or Control operations can, as will be explained below, be realized by a corresponding control unit.

It is also preferred that the means comprise a spring unit acting resiliently between the two furniture parts during the ejection process. By a resiliently or elastically behaving element or component, which abuts adjacent to portions of the movable furniture part and the fixed furniture part under tension, the transferable during the ejection force or the moment, for example, depending on a spring constant or spring properties adjusted accordingly be effective. In particular, the size or duration of the drive effect applied to the movable furniture part can thus be predetermined automatically. If relatively small forces act on the ejection process on the spring unit, but this can also act as a rigid ejection element. For larger bending stresses of the spring unit when ejecting different ejection effects can be adjusted by the spring unit, whereby an ejection element is provided, the ejection effect is automatically adjusted. A spring unit, for example an elongated or elastically deformable flat part or a rod element made of, for example, plastic or a metallic material, e.g. made of spring steel, is sturdy, can be stored in a space-saving manner or used cost-effectively.

It is furthermore advantageous that the spring unit comprises a part of the ejection element that is elastically deformable during the ejection process. Thus, the spring unit may be integrated on the ejection element or form part of it or possibly completely form the ejection element. In particular, no additional components for adjusting the drive effect depending on the discharge behavior of the movable furniture part must be installed.

Preferably, the means comprise an electrically operating unit. This is particularly advantageous if the change in the drive effect takes place in an electrical manner or takes place electrically assisted. In addition, an already existing electrical unit can be used to advantage, since the drive unit for driving the ejection element comprises an electrically operating unit, for example, for controlling or controlling a drive motor or an electric motor. In addition to providing an electrical supply, the electrical unit can also serve as a computer or computer unit or cooperate with it. To the electrically operating unit are also to be counted peripheral units, e.g. Display, input, connection, switching, control, control, or sensor means.

The means preferably comprise a control device for the control of the drive unit for the ejection element. The control unit for the control of the drive unit or the electric motor is used, inter alia, the coordination of the driven movement of the ejection element. In particular, the control unit can regulate or control the drive unit in order to set a desired duration and / or power of the drive, for example to realize a drive speed or a drive torque.

It is further proposed that the control device is designed to process information about a determined parameter of the ejection process. Thus, in the ejection process, for example, at the beginning or during a first comparatively short phase of the ejection movement, a size or parameter determined by the sensor, for example, and the information thus obtained can be processed in a timely manner. In particular, conclusions about real conditions during the ejection process are possible with the parameter. On Based on the information of the currently running ejection process of the movable furniture part may be adjusted so that for different conditions, such as the loading state of the movable furniture part, a desired discharge behavior is achieved, for example, to ensure a desired total discharge path. A parameter of the ejection process may, in particular, be understood to mean a variable or parameter of the drive unit that can be determined with regard to the drive unit. For example, the parameter may be a measured electrical current received by the drive unit, a measured time, for example, for the driven movement of the ejection element about a defined path and / or a defined angle or distance or angle of the ejection element within a measurement time.

Advantageously, the control unit is designed to process information about a determined parameter of the ejection process, in particular in a start phase of the driven movement of the ejection element. Information about the determined parameter in a start phase or immediately in a comparatively short time after the start of the driven movement of the ejection element can be immediately further processed and utilized with the help of the control unit for the subsequently executed ejection movement.

If, for example, a time period is measured which requires the ejection element in order to move from the rest or start position to a specific ejection position, it can be judged, depending on the time duration, whether the movable furniture part is unloaded or the mass to be moved is relatively small or whether the movable furniture part or the drawer loaded or the mass to be moved is relatively large, whereby a greater time is determined. Thus, if necessary, the size of the load or the mass to be moved can be derived in stages become. It is not in the ejector to the question of whether the movable furniture part is loaded or not, but in principle, which is the total mass with the movable furniture part to move or eject. The total mass of a movable furniture part to be moved depends not only on the load but also, for example, on the construction or the materials of the movable furniture part.

Alternatively, it is also possible, for example, to measure a position of the ejection element which is reached after a predetermined measurement time. The path traveled in the measuring time or a set back angle of the ejection element or possibly a shape of a shape-variable ejection lever can then be evaluated and used as the basis for the adaptation of the subsequent or residual ejection process.

In particular, it is advantageous that the control unit is designed to determine a height of the drive power to be applied during the ejection process via the drive unit on the basis of the information of the determined parameter of the ejection process. Thus, the drive power can be adjusted or a preset drive power can be increased or reduced accordingly. Alternatively, it may be advantageous that the control unit is designed to determine a time duration of the drive power to be applied during the ejection process via the drive unit on the basis of the information about a determined parameter of the ejection process. Thus, for example, with the control unit, a variability of the drive effect can be achieved even if only a fixed predetermined or limited to the top size of the drive power is taken into account. For non-variable drive strength, for example, for an empty drawer over a slightly longer period of time the drive can be applied, as with a heavier drawer, to obtain a total of the same overall discharge path for both drawers.

Furthermore, for such systems, a consistently large Ausrollweg at different loads of great advantage. This requires different ejection speeds, since the weight loading causes the drawer slides to bend. An empty drawer moves slightly uphill when pulling out, whereas a fully loaded drawer drives downhill. As a result, it is necessary to accelerate an empty tray to a higher speed than a full tray to bring the tray to a halt after the same roll-out path. The acceleration force is dependent on the acceleration time, the acceleration path and the mass. The acceleration time is defined by the shape and speed of the cam and is constant. In order to achieve the different accelerations depending on the mass, the acceleration path is automatically changed by a spring or an elastic lever. The cam tries to move a full load at the same time using the same feed path as an empty load. This higher acceleration forces occur, which in turn bend the Ausschubhebel and thereby has a lower Ausschubweg at a full load result. Since the load is accelerated at the same time a lower Ausschubweg, the load at a full load on a lower ejection speed, as in an empty tray. In the embodiments shown, a leaf spring is used, but there are also coil springs or similar elastic elements possible.

Moreover, the invention relates to a piece of furniture with a movable furniture part, which is accommodated on a stationary furniture part, wherein a device of the type described above is present. This can be realized for a correspondingly equipped furniture, the above advantages or features, especially for a piece of furniture with a displaceable by means of a guide on a Furniture carcass movably received drawer.

Basically, it is advantageous in the proposed arrangement that regardless of the method of attachment of the movable furniture part on the fixed furniture part, the ejection device universally attachable or this is easy to retrofit. In particular, there is no need to provide additional provisions for locking the movable furniture part in the closed position, since the movable furniture part can be locked by conventional means, e.g. an automatic retraction can be kept in the closed position.

Under furniture parts are primarily furniture parts for kitchen and home furniture to understand, however, the term furniture parts in the context of the invention may also extend to drawers, doors and flaps at other facilities, such as a drawer on a tool cabinet or car.

figure description

In the figures, further details and features of the invention with reference to highly schematically illustrated embodiments are explained in more detail. In the figures, corresponding parts of different embodiments are sometimes used the same reference numerals.

Figur 1

ein schematisch dargestelltes Möbel mit geschlossener Schublade in perspektivischer Ansicht,

Figur 2

das Möbel gemäß Figur 1 unter Weglassung von einzelnen Teilen, wobei die Schublade geöffnet dargestellt ist,

Figur 3 bis Figur 6

eine Ansicht von oben auf das Möbel gemäß Figur 1 ohne ein Oberteil, wobei die Schublade in unterschiedlichen Stellungen vor, während und nach einem Ausstoßvorgang dargestellt ist,

Figur 7 und Figur 8

jeweils eine Prinzipdarstellung unterschiedlicher erfindungsgemäßer Ausstoßvorrichtungen beim Ausstoßen einer Schublade in Seitenansicht,

Figur 9

ein Ausführungsbeispiel einer erfindungsgemäßen Ausstoßvorrichtung im eingebauten Zustand in einem Möbel mit einer unbeladenen Schublade stark schematisiert unter Weglassung einzelner Teile,

Figur 10 und Figur 10a

das Ausführungsbeispiel gemäß der Darstellung in Figur 9 mit einer beladenen Schublade in einer Gesamtansicht und einer vergrößerten Detailansicht,

Figur 11

ein Schaubild in einem 2-achsigen Diagramm mit zwei beispielhaften Verläufen für eine erste Methoden zur Regelung eines erfindungsgemäßen Ausstoßelements,

Figur 12

ein weiteres Schaubild in einem 2-achsigen Diagramm mit zwei beispielhaften Verläufen für eine alternative Methoden zur Regelung eines erfindungsgemäßen Ausstoßelements und

Figur 13 und Figur 14

jeweils ein Schaubild in einem 2-achsigen Diagramm zur Veranschaulichung einer Motorsteuerung für einen Antriebsmotor bei hoher und bei niedriger Motordrehzahl für ein erfindungsgemäßes Ausstoßelements.

In detail shows

FIG. 1

a schematically illustrated furniture with closed drawer in perspective view,

FIG. 2

according to the furniture FIG. 1 with omission of individual parts, the drawer being shown open,

FIG. 3 to FIG. 6

a view from the top of the furniture according to FIG. 1 without a top, the drawer being shown in different positions before, during and after an ejection process,

FIG. 7 and FIG. 8

each a schematic diagram of different inventive ejection devices when ejecting a drawer in side view,

FIG. 9

an embodiment of an ejection device according to the invention in the installed state in a piece of furniture with an unloaded drawer highly schematized with the omission of individual parts,

FIG. 10 and FIG. 10a

the embodiment as shown in FIG FIG. 9 with a loaded drawer in an overall view and an enlarged detail view,

FIG. 11

1 is a diagram in a 2-axis diagram with two exemplary progressions for a first method for controlling an ejection element according to the invention,

FIG. 12

a further diagram in a 2-axis diagram with two exemplary gradients for an alternative methods for controlling an ejection element according to the invention and

FIG. 13 and FIG. 14

each a diagram in a 2-axis diagram illustrating a motor control for a drive motor at high and low engine speed for an inventive ejection element.

The FIGS. 1 and 2 show a furniture 1 with a body 2 and a 2 movable in the body 2 via a pull-out drawer 3. The pull-4 includes in particular a known full extension with a drawer-side drawer rail, a body-side fixed rail and a movable between them middle rail. In FIG. 1 is the drawer 3 in a closed position, in which between the body 2 and an inner side of a front section 3a of the drawer 3, a front gap 5 is formed, for example, a few millimeters. The front section 3a has no handle in the example shown, but also a handle may be present.

The front gap serves primarily to enable a release command by pressing on the front part 3a for a discharge operation, in which the drawer 3 can be moved in the direction of the body 2 over a few millimeters, reducing the front gap 5. A triggered ejection process is carried out with an ejection device 6 according to the invention. Is in the in FIG. 1 As shown, the closed drawer 3 is pressed slightly, a movement of the drawer can be registered via, for example, corresponding sensors, not shown, whereby an ejection process by means of the ejector 6 is triggered.

FIG. 2 shows the fully opened drawer 3 in the body 2, shown without a side wall, back wall and top. An ejection lever 7 of the ejector 6 is shown in a maximum pivoted position. The ejection lever 7 can be pivoted, for example, with respect to the rear wall of the furniture body 2, not shown, by a maximum pivoting angle of approximately 80 to approximately 90 degrees or more. By pivoting the ejection lever 7 this comes to rest on the outside of a rear wall 3b of the drawer 3 and can push the drawer 3 from a closed position in particular by a distance of, for example, about 30 to 70 mm from the closed position according to FIG. 1 move in the opening direction. For this purpose, the discharge lever 7 is moved from an applied or folded-back position into the drive unit concealed by a housing part FIG. 2 shown pivoting driven driven. Thereafter, a contact between the rear wall 3b and the ejection lever 7 is released and the moving drawer 3 can move on a bit freely. Subsequently, preferably when the drawer 3 is still a piece of free moves or as soon as the contact between the rear wall 3b and the ejection lever 7 is released, in particular by means of the drive unit of the ejection lever 7 is pivoted back into the folded back position, for a next Verschwenk- or Ejecting process ready to be. When applied position of the ejection lever 7 (not shown) whose longitudinal axis is aligned approximately parallel to the drawer rear wall 3b and to trusses 8a, 8b.

Above the two trusses 8a and 8b, the ejector 6 is releasably clipped. The two trusses 8a, 8b are themselves accommodated in receiving flanges 9a and 9b, which are fastened to the side walls of the furniture body 2.

The ejection device can also be attached to the drawer 3 and be moved with this, then the ejection lever 7, at least for ejecting in contact with, for example reach the rear wall of the body 2.

The ejection lever 7 is in FIG. 2 shown in its maximum pivoted position so that it is clearly visible, with completely open drawer 3 of the ejection lever 7 is usually already in its zurückgeschwenkten position or in its rest position.

In the FIGS. 3 to 6 a furniture 1 is shown from above with omission of an upper side of the body 2, the one to the ejection device according to FIG. 2 modified ejection device 6 has. The furniture body 2 shows a rear wall 2a, a right side wall 2b and a left side wall 2c. In addition, between the side walls 2b and 2c extending trusses 8a and 8b according to FIG. 2 housed, where the ejector 6 is attached. In FIG. 3 when completely closed drawer 3, the ejection lever 7 is stretched or straight in its shape and in a swung-back rest position. The ejector 6 or the trusses 8a, 8b advantageously require a comparatively small installation space, in particular in the depth of the furniture 1.

The FIGS. 4 and 5 show the ejection lever 7 in a bent shape or with a bend, wherein a front angled portion of the ejection lever 7 on a rear wall 3b of the drawer 3 area ( FIG. 4 ) or selectively ( FIG. 5 ) may be present. In FIG. 5 the ejection lever 7 is pivoted slightly further than in FIG. 4 , wherein the pivoting movement of the ejection lever 7 is effected by a drive unit, not shown. By the pivoting movement of the ejection lever 7 and its attachment to the rear wall 3b of the drawer 3, the drawer 3 from the in FIG. 3 shown closed position moves a little way in the opening direction. The drawer 3 is going through the movement of the ejection lever 7 not in the fully open position according to FIG. 6 emotional. Rather, the drawer 3 is brought after the ejection movement by ejection lever 7 in a partially open position, from which, for example, a person can open the drawer 3 by hand on or close again.

The sequence of movements could also be optimized so that the movable furniture part lags behind solely by the ejection process to the complete or almost complete open position.

After the ejection operation, the ejection lever 7 is immediately or shortly thereafter pivoted back to its rest position, such as FIG. 6 clarified. Due to the articulated Abknickmöglichkeit of the ejection lever of the ejection process at an angle forming ejection lever 7 in its rest position according to FIG. 3 respectively. FIG. 6 again completely stretched or space-saving in the body 2 accommodated.

In FIG. 7 and FIG. 8 is ever a schematic diagram of two different ejector 6 during the ejection process of a drawer 3 shown in side view, wherein a drawer 3 receiving furniture body is not shown. The ejection devices 6 according to FIGS. 7 and 8 are shown in a highly schematized or not to scale. The ejection devices 6 are for example attachable to a rear wall of the furniture body.

At the drawer 3 is located on the rear wall 3b an elastically deformable part 14 of the ejection lever 7, wherein the elastic member 14 engages a rigid part 13 of the ejection lever 7. The ejection lever 7 is pivotable about a pivot axis S via a driven with a drive unit movable cam plate 10. More parts in particular the ejection device 6 such as the drive unit are not shown. In the driven rotation of the cam disk 10 about the eccentrically positioned rotation axis R, a support roller 12 is supported on a support foot 11 of the rigid part 13 on a circumferential or closed guide track 10a, which is formed by a radially outer narrow side of the cam plate 10. By the rotation of the cam plate 10 here, for example, clockwise, the rigid part 13 of the ejection lever 7 and with this an elastic part 14 of the ejection lever 7 is pivoted. In this case, the elastic member 14 presses against the rear wall 3b of the drawer 3, which is thereby ejected. As a result of the permanent support of the support foot 11 via the support roller 12 on the guide section or guide track 10a of the cam disc 10, which is guided past it in rotation, the pivoting movement of the ejection lever 7 can be determined. In particular, a uniform Verschwenkverlauf of the ejection lever 7 when pressing against the rear wall 3b and a comparatively fast pivoting back of the ejection lever 7 is realized after the actual ejection process. The guideway 10a may be formed in a variety of ways, eg, as shown, consisting of two nearly straight sections joined together by two curved sections, the rotation axis R lying relatively far outwardly near a transition of a straight section into a curved section.

An alternative embodiment of an ejection lever in a position according to FIG. 7 shows FIG. 8 in which the ejection lever 7 in comparison to the ejection lever FIG. 7 is designed without elastic part and with an extension of the rigid part, wherein the ejection lever 7 a bend 15 is present. The transmission of a pivoting movement on the ejection lever 7 takes place accordingly FIG. 7 via a cam 10. The bend 15 may be arranged so that during the ejection process by the bend 15 formed kink angle does not change significantly or can change over a fixable measure, for example, elastic.

In the FIGS. 9 to 10a is highly schematic a bending lever 16 as part of an ejector 6 (highly schematic with omission of a drive unit) in the installed state in a piece of furniture 1 or on a rear wall 2a of a furniture body 2 in cooperation with a slidably received therein drawer 3 shown. The ejector 6 is alternative to the cam according to the FIGS. 7 and 8 provided with a driven by means of the drive unit rotatable steering wheel 18 to pivot the bending lever 16. In FIG. 9 the discharge operation of the drawer 3 is shown by means of the bending lever 16, wherein the drawer 3 is unloaded. The bending lever 16 or its rigidly or from a limit load elastically behaving lever member 17 is not or almost not elastically deformed when ejecting the unloaded drawer 3, which in FIG. 9 becomes clear. The drawer 3 according to FIG. 9 is moved when ejecting forward according to arrow P1.

In the FIGS. 9 to 10a is a front end 3a of the drawer 3 is shown only in a lower part to better illustrate the relationships.

In FIG. 10 is an ejection operation by means of the bending lever 16 according to an arrangement according to the FIG. 9 shown in a heavy or heavily loaded drawer 3. The heavy loading of the drawer 3 is symbolized by a weight element. The lever member 17 is bent under the comparatively heavy load of the ejected drawer 3 elastic to the rear, which in particular in the enlarged section according to FIG. 10a becomes clear.

In the FIGS. 11 and 12 are two different methods for controlling an ejection element in a 2-axis Diagram with two idealized curves K1 and K2 explained. In this case, a distance traveled s of a movable furniture part and applied to the vertical or ordinate axis occurring by the ejection process speed v of the movable furniture part on the horizontal or abscissa axis. A distance traveled s is "zero" in the closed position of the movable furniture part. During the ejection process by the ejection element, the movable furniture part is first accelerated out of the closed position, which is done by the contact of the discharge element, for example, attached to the body with the movable furniture part. It is assumed that as long as this contact of the moving ejection lever is present, a driving effect is transmitted to the movable furniture part. If then the contact with the ejection element is canceled (eg waypoint s2 in FIG. 11 ), the movable furniture part can track from a maximum speed v2 (K1) or v2 (K2) reached to a standstill at waypoint s *.

FIG. 11 relates to a scheme in which dependent on the weight of the movable furniture part, a drive speed is adjusted or adjusted to a constant reversal point, from which no more drive, at the distance s2. K1 describes the movement of a movable furniture part with low weight during the ejection process or K2 the movement with a comparable larger weight of a movable furniture part. In both cases, the total distance traveled by the movable furniture part should be the same by the ejection process, here to the distance s *. In the curve K1 for the lighter furniture part, a higher speed v1 (K1) can be achieved in a first movement phase up to the distance s1 as a result of the weight-dependence of the drive effect. Within this movement phase, for example, a recorded current of the drive unit can be measured and used as the basis for the Further determination of the drive power can be used. In order to allow for the same total distance covered up to the distance s * at each different weight of the movable furniture part, the movable furniture part is further accelerated in a second movement section to the reversal point s2 or until the dissolution of the contact between the ejection element and the corresponding furniture part. The lighter furniture part up to the speed v2 (K1) or the heavier furniture part up to the speed v2 (K2) (at waypoint s2), which is smaller than v2 (K1). Thereafter, the speed reached in each case falls linearly from v2 (K1) or v2 (K2) to v = 0 in waypoint s *.

Because of the greater weight of the movable furniture part, a guide will give way that results in a slightly inclined to the unloaded condition career for the movable furniture part and thus despite the lower initial speed v2 (K2) in waypoint s2 the heavier furniture part lags the same as the lighter furniture part. The lighter furniture part must have, so to speak, a slightly higher initial speed v2 (K1) in waypoint s2 in order to reach the waypoint s * along a non-sloping track (because of the relatively low weight of the furniture part according to K1).

FIG. 12 shows an alternative control method, in which also measured in a first movement section to the distance s1 a recorded current of the drive unit and for the interpretation of the further drive power to the respective movable furniture part or on the driven movable ejection element is based. From this it can be seen that both furniture parts are accelerated regulated driven at the same speed and a reversal point, from which no more drive is tuned or a different long distance of the total traveled Distance of the movable furniture part, here from the closed position to s2 or to s3, where s3 is greater than s2, is realized by a driven pivoting or ejection movement of the ejection element. A movable furniture part with a lower weight is driven according to the curve K1 driven to a waypoint s3 up to a speed v3, whereas a movable furniture part with comparatively higher weight according to curve K2 is accelerated driven only up to a distance s2 to a speed v2. By this measure, the non-driven caster of the two movable furniture parts to the waypoint s * take place.

FIG. 13 and FIG. 14 Graphically represent a motor control for the drive unit for the driven movement of the ejection element, wherein over the abscissa the time t and above the ordinate a voltage U is plotted. FIG. 13 shows a rectangular waveform PWM1 a pulse width modulation at high speed of a motor of the drive unit, whereas FIG. 14 shows a rectangular waveform PWM2 a pulse width modulation at low speed of the motor of the drive unit. For an application of pulse width modulation, the control of motors is particularly advantageous since a comparatively high efficiency can be achieved here. In contrast to a digital-to-analog conversion with a downstream amplifier for driving the drive motor, a comparatively high power loss occurring in the amplifier would be converted into heat. In the case of a fully connected field-effect transistor, resistance and thus the power loss are comparatively very low.

LIST OF REFERENCE NUMBERS

1

Furniture

2

corpus

2a

rear wall

2 B

Side wall

2c

Side wall

3

drawer

3a

front section

3b

rear wall

4

pull-out

5

front gap

6

ejector

7

ejector lever

7a

investment side

8a

traverse

8b

traverse

9a

receiving flange

9b

receiving flange

10

cam

10a

guideway

11

Outrigger

12

supporting role

13

rigid part

14

elastic part

15

kinking

16

bending lever

17

lever member

18

Steering wheel

18a

guideway

Claims (11)

1. Mechanism for ejecting a furniture part (3) which is mounted movably on a stationary furniture part (2), comprising an ejection element (7, 16) drivable by a drive unit, which ejection element (7, 16) is attached onto one of the two furniture parts (2, 3) and is temporarily in contact with the other furniture part in order to eject the movable furniture part (3), wherein the ejection element (7, 16) can be driven, with the intention that during an ejection process the contact between the ejection element (7, 16) and the other furniture part is broken, wherein means are provided in order to implement a driving effect on the ejection element (7, 16) or the movable furniture part (3), which changes automatically as a function of the ejection behaviour of the movable furniture part (3), characterised in that the means comprise a spring or elastically behaving element and are designed such that on ejecting the unloaded furniture part the means are not deformed elastically or are virtually not deformed elastically and with a heavy or heavily loaded furniture part the means are bent elastically to the rear wherein the means comprise a bending lever.
2. Mechanism according to claim 1, characterised in that the means are designed such that the movable furniture part (3) is prompted by the ejection process to cover a predefinable ejection distance until the movable furniture part (3) stops.
3. Mechanism according to either claim 1 or 2, characterised in that the means comprise a spring unit (14, 17) acting during the ejection process in a resilient manner between the two furniture parts (2, 3).
4. Mechanism according to any one of the preceding claims, characterised in that the spring unit (14, 17) comprises a part of the ejection element (7, 16) which is elastically deformable during an ejection process.
5. Mechanism according to any one of the preceding claims, characterised in that the means comprise an electrically operating unit.
6. Mechanism according to any one of the preceding claims, characterised in that the means comprise a control device for controlling the drive unit for the ejection element (7, 16).
7. Mechanism according to any one of the preceding claims, characterised in that the control device is designed to process information about a detected parameter of the ejection process.
8. Mechanism according to any one of the preceding claims, characterised in that the control device is designed to process information about a determined parameter of the ejection process, in particular in a starting phase of the driven movement of the ejection element (7, 16).
9. Mechanism according to any one of the preceding claims, characterised in that the control unit is designed on the basis of information about a determined parameter of the ejection process to determine the level of drive power to be applied by the drive unit during the ejection process.
10. Mechanism according to any one of the preceding claims, characterised in that the control unit is designed to establish on the basis of information about a determined parameter of the ejection process the duration of the drive power to be applied during the ejection process by the drive unit.
11. Piece of furniture comprising a movable furniture part (3), which is mounted on a stationary furniture part (2), which comprises a mechanism according to any one of the preceding claims.

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