EP2983556A1

EP2983556A1 - Drive device for a movable furniture part

Info

Publication number: EP2983556A1
Application number: EP14719185.2A
Authority: EP
Inventors: Harald Brunnmayr; Michael Blum
Original assignee: Julius Blum GmbH
Current assignee: Julius Blum GmbH
Priority date: 2013-04-12
Filing date: 2014-03-26
Publication date: 2016-02-17
Anticipated expiration: 2034-03-26
Also published as: CN105101841A; MY182100A; ES2754708T3; JP6246896B2; US9655447B2; JP2016514575A; US20150374124A1; AT514058A4; TR201816130T4; EP3400831B1; EP3400831A1; EP2983556B1; CN105101841B; AT514058B1; WO2014165877A1; ES2697323T3

Abstract

Drive device (1) for a movable furniture part (2), having a lockable ejection device (3) for ejecting the movable furniture part (2) from a closed position (SS) into an open position (OS), wherein the ejection device (3) can be unlocked by pressing over the movable furniture part (2) into a pressed-over position (ÜS) situated behind the closed position (SS) in the closing direction (SR), wherein a blocking element (4) is provided which has a blocking position (B) in which the blocking element (4) prevents the unlocking of the ejection device (3) on reaching the pressed-over position (ÜS), and which has a release position (F) in which the ejection device (3) can be unlocked on reaching the pressed-over position (ÜS).

Description

Drive device for a movable furniture part

The invention relates to a drive device for a movable furniture part, with a lockable ejection device for ejecting the movable furniture part from a closed position to an open position, wherein the ejection device can be unlocked by overpressing the movable furniture part in a lying in the closing direction behind the closed position Überdrückstellung. In addition, the invention relates to a piece of furniture with such a drive device. Furthermore, the invention relates to a method for opening and closing a movable furniture part with a drive device, comprising the step of ejecting the movable furniture part from a closed position to an open position by a lockable ejection device, wherein the ejection device by pressing the movable furniture part in a closing direction behind the Closed position overpressure position is unlocked. In the furniture fitting industry driving devices are already known for many years, with which by pressing on a movable furniture part (for example, on a drawer) unlocking this movable furniture part from the furniture body and then the movable furniture part is opened or actively ejected. For this purpose, such drive devices have a so-called touch-latch mechanism. In this mechanism, the movement for closing the drawer from the open position and the movement for unlocking or opening the drawer from the closed position in the same direction, namely in the closing direction. In a normal gentle closing (manually or by a retraction device), the drawer or the movable furniture part is held at the end of the closing movement by a locking device in the closed position. But if a too strong pressing or pushing the drawer to the end stop (corresponds to the overpressure position), the ejection device can not lock or is immediately triggered again, whereby no safe closing is guaranteed in such a malfunction of the movable furniture part.

To solve this problem, from the priority older but not previously published Austrian patent application A 52/2012 a blocking element is known to prevent the movement in the overpressure position at too fast closing movement. Thus, the push-through movement of the movable furniture part is stopped in the closed position by the blocking element and there can be no pushing or overpressing. The object of the present invention is to provide an alternative possibility to prevent triggering of the ejection device during pressing.

This is achieved by a drive device with the features of claim 1. Accordingly, a blocking element is provided which has a blocking position in which the blocking element prevents the unlocking of the ejection device upon reaching the overpressure position, and which has a release position in which the ejection device can be unlocked upon reaching the overpressure position. By this blocking element is thus - in contrast to the patent application A 52/2012 - the movable furniture part is not held in the closed position when pressed, but it is allowed to push up to the end stop or up to the overpressure. In particular, this is the movement of the movable furniture part in the overpressure possible while pushing through, but the unlocking of the ejection device located in the blocking position blocking element is then prevented.

It is possible that the blocking element is already brought in the blocking position in the opening direction when moving the movable furniture part. Preferably, however, it is provided that the blocking element during movement of the movable furniture part in the closing direction is movable into the blocking position. It is important in any case that the blocking element is movable before reaching the closed position or at the latest when reaching the closed position in the blocking position.

In order to allow a normal triggering of the entire drive device by overpressing is provided that the blocking element is moved back from the blocking position to the release position. Basically, in this return movement of the blocking element of the blocking position in the release position, the movable furniture part in the overpressure between the closed position and the Overpressure are located. Preferably, the movable furniture part is on return of the blocking element in the release position but in the closed position.

For a mechanically simple switching between the blocking position and the release position, it is preferably provided that the blocking element can be moved by a return device from the blocking position into the release position.

In principle, it is possible that the return movement takes place as a function of the closing pressure or the closing speed. That is, in massive or fast moving the movable furniture part of the closed position in the overpressure, the blocking element can prevent the release of the ejection device. However, since it may well be desirable to unlock the movable furniture part with strong compression, it is preferably provided that the return movement of the reset device takes place with a time delay. That is, a certain time after reaching the closed position unlocking the ejection device is not possible, whereby an unlocking is prevented in the immediate pushing of the movable furniture part in the overpress position. It is preferably provided for this purpose that the return movement takes between 0.2 seconds and 4 seconds, preferably between 0.3 seconds and 1 second. At least during this period, therefore, unlocking of the ejection device is not possible after reaching the blocking position or the closed position.

In principle, the lockable ejection device can be designed in such a way that it has a latching pin which can be latched in a heart-shaped guideway. However, a preferred embodiment of the present invention provides a ejection force accumulator force actuated ejection lever and a locking base movable movable locking member against which the ejection lever in the closed position, wherein in the closed position the locking element located in a locking position obstructs the path of the ejection lever in an ejection section and in Überdrückstellung the locking element located in a release position releases the path of the ejection lever in the ejection section. Thus, the element being locked (namely, the ejection lever) also simultaneously constitutes the force-loaded component for ejection. These two components are always separately formed in heart-stroke to-latch mechanisms.

In principle, it is possible that the blocking element can be formed at any point of the drive device or even separately. Preferably, however, it is provided that the blocking element is mounted on the locking element movable, preferably rotatable.

In order to bring the blocking element in the blocking position is preferably provided that the blocking element in a closing movement of the ejection device, preferably of the ejection lever, is movable into the blocking position.

Furthermore, it is preferably provided that the blocking element thereby prevents the unlocking of the ejection device upon reaching the overpressure position, that the blocking element located in the blocking position prevents the movement of the locking element in the release position.

The blocking position can preferably be achieved in that the blocking element is mounted in a limited - preferably formed in the locking base - guideway movable, wherein the blocking element is held in its blocking position in the guideway, preferably wedged, is.

In order to increase the functional scope of the drive device and also to improve the ease of use, the drive device may also have a - preferably formed by the ejection - - retractor. Preferably, this retraction device can also be damped by a damping device. Particularly preferably it is accordingly provided that the drive device has a control path, wherein the ejection lever abuts the ejection portion of the control path when ejecting the movable furniture part, when clamping the ejection force accumulator rests against a clamping portion of the control path and when retracting the movable furniture part in the closed position in the function Pulling device abuts a Einziehabschnitt the control track. Protection is also desired for a piece of furniture with a furniture body, a furniture part movable in the furniture body and a drive device according to the invention.

For a method for opening and closing a movable furniture part with a drive device, the object of the invention by moving a blocking element of the drive device when closing the movable furniture part in a blocking position in which the release of the ejection device is prevented upon reaching the overpressure position, and moving the blocking element of the blocking position in a release position in which the release of the ejection device is achieved upon reaching the overpress position. Particularly preferably, it is provided that the movement of the blocking element from the blocking position into the release position with the movable furniture part in the closed position is delayed in time, preferably in a time between 0.2 and 4 seconds, by a rear part device.

Further details and advantages of the present invention will be explained in more detail below with reference to the description of the figures with reference to the exemplary embodiments illustrated in the drawings. Show:

1 shows a furniture with a pull-out guide and a drive device,

2a, the pull-out guide with the drive device,

2b shows a detail of Figure 2a,

3a to 3c, the drive device in a closed position,

4a and 4b, the drive device when overpressing,

5a to 7, the drive device during ejection,

8, the drive device in the freewheel,

9 shows the drive device during clamping,

10 shows the drive device with fully tensioned energy storage,

1 1, the drive device during retraction,

Fig. 12a to 13c, the drive device when moving the blocking element in the

Blocking position,

14 shows the drive device when reaching the closed position, 15a to 15b, the drive device when prevented by the blocking element unlocking,

16 is a time-path diagram of the movement of the movable furniture part in normal closing and release,

Fig. 17 is a time-path diagram of the movement of the movable furniture part when pushing and

Fig. 18 to 23b an alternative embodiment of the blocking element.

Figure 1 shows a furniture 13 consisting of a furniture body 14 and movably mounted therein furniture parts 2. These movable furniture parts 2 in the form of drawers are mounted linearly displaceable over a pull-16 on the furniture body 14. This pull-out guide 16 has a cabinet rail 18, a drawer rail, not shown here, and optionally a center rail. On the pull-out guide 16 or on the movable furniture part 2, the drive device 1 is attached.

For this purpose, it can be seen in FIG. 2 a that the drive device has, as essential components, an ejection lever 7 and the ejection force accumulator 6, which simultaneously acts as a retraction force accumulator 11. In addition, a damping device 19 is provided.

It can be seen in detail in FIG. 2b that the ejection lever 7 rests against the ejection stop 27 via the ejection roller 20. The ejection roller 20 is rotatably mounted on the ejection lever 7 via the pivot bearing 29. Basically, the ejection lever is rotatably supported about the pivot axis X on the ejection base plate 26. This ejection base plate 26 is mounted on a drawer bottom side of the movable furniture part 2 in this embodiment. The ejection force accumulator 6 is fixed to the ejection base plate 26 via the spring base 24 and to the ejection lever 7 via the spring base 25. The ejection energy storage 6 is designed as a tension spring. In contrast to the ejection base plate 26, the lock base 8 is mounted on the body rail 18. At this locking base plate 8 of the ejection stop 27 is arranged. In addition, the control element 21 is movably mounted in the release direction R on the locking base plate 8. By a force accumulator, not shown here, the control 21 in Release direction R subjected to force. In addition, a force-loaded flap 23 is rotatably mounted on the control element 21. The damping device 19 has a damping piston 28, wherein this damping piston 28 rests against the slider 34. This slider 34 is above all shortly before reaching the closed position SS on the ejection lever 7 and attenuates the Einziehbewegung of Einziehkraftspeicher 1 acting ejection force memory 6. For moving the movable furniture part 2 in the opening direction OR, the movable furniture part 2 abuts on the movable furniture part 2 disposed ejection lever 7 on the furniture body 14 formed or arranged ejection stop 27 from.

FIGS. 3 a to 3 c show various views of the drive device 1, this position of the drive device 1 corresponding to the closed position SS of the movable furniture part 2. It can further be seen that the blocking element 4 rotatably mounted on the control element 21 is in a release position F. Connected to the control element 21 or integrally formed therewith is the locking element 9 which, according to FIGS. 3 a to 3 c, is in the locking position V. In this locking position V, the ejection lever 7 abuts the locking element 9 via the ejection roller 20. Although not shown, between the locking base plate 8 and the control element 21 force memory would like to move the locking element 9 in the release direction R, but this is prevented by the voltage applied to the locking element 9 ejection lever 7, since the force of the ejection force memory 6 is greater than that of not shown force accumulator between locking element 9 and control element 21 and locking base plate. 8

If now in the closing direction SR pressed onto the movable furniture part 2, the movable furniture part 2 passes into the overpressure position ÜS, in which case the drive device 1 is in the position according to FIGS. 4a and 4b. By moving the movable furniture part 2 in the closing direction, the ejection base plate 26 moves relative to the locking base plate 8. However, since according to the closed position SS already the ejection roller 20 of the ejection lever 7 in the closed position SS abuts on the ejection stop 27, can move when moving the movable furniture part 2 in the Überdrückstellung ÜS the ejection roller 20 not further move in the closing direction SR, but it is triggered pivoting of the ejection lever 7 about the pivot axis X. By this pivoting, the ejection roller 20 remains in the same position as seen in the closing direction SR, but there is a movement of the ejection roller 20 transversely to the closing direction SR or opening direction OR. As a result, the ejection roller 20 is moved away from the locking element 9 and brought out of contact until the control element 21 together with the locking element 9 due to the force accumulator, not shown on the ejection roller 20 can move past in the release direction R. Thus, the locking member 9 passes from the locking position V in the release position G, whereby the ejection lever 7 is no longer held on the locking element 9 and the way in the ejection section A is free.

Once this ejection section A is no longer locked by the locking element 9, the ejection force accumulator 6 can relax and pivots the ejection lever 7 counterclockwise to the position shown in Figures 5a to 5c. With this pivoting, the ejection lever 7 abuts on the ejection stopper 27 on the ejection stopper 27 of the ejection base plate 26 and moves the movable furniture member 2 relative to the furniture body 14 in the opening direction OR. Thus, the movable furniture part 2 according to the figures 5a to 5c is in an open position OS. The locking element 9 is still in the release position G.

Characterized that the ejection force memory 6 continues to relax, the drive device 1 passes further into the positions shown in Figures 6 and 7. By the momentum of the ejector 3 or by manual pulling on the movable furniture part 2 in the opening direction OR, the drive device continues in the position according to Figure 8. In this position, the movable furniture part 2 is in a freewheel. When the movable furniture part 2 of FIG. 8 is moved further in the opening direction OR, the flap 23 allows the ejection roller 20 to pass clockwise.

When the movable furniture part 2 is then moved back in the closing direction SR, the discharge roller 20 comes into abutment with the on the flap 23 and on Control 21 trained clamping section S (see Figure 9). As soon as the ejection roller 20 contacts the control element 21 or the flap 23, the entire control element is moved against the force of the energy accumulator, not shown, counter to the release direction R, whereby the locking element 9 reaches the locking position V.

Upon further movement of the movable furniture part 2 in the closing direction SR moves or rolls the ejection roller 20 along the clamping portion S to the position shown in Figure 10, in which the ejection force memory 6 is fully stretched. The tensioning section S forms the essential components of the control track 12 with the pull-in section E and the ejection section A.

After exceeding the position shown in Figure 10 in the closing direction SR of the ejection lever 20 enters the Einziehabschnitt E according to Figure 1 1, wherein the ejection lever 7 now acts in cooperation with the Einziehkraftspeicher 1 1 as a retraction device 35. Due to the mechanical contact between the ejection roller 20 and the control element 21, the control element 21 is further pressed against the release direction R, so that the locking element 9 remains in the locking position V. Subsequently, the discharge roller 20 comes in contact with the rotary lever 30 of the blocking member 4, as shown in Figures 12a to 12c. Through this contact, the blocking element 4 is rotated about the pivot bearing 32 in a clockwise direction. As a result, the blocking cam 31 also shifts in the guide track 10 formed in the locking base plate 8. Simultaneously with this rotation, the return device 5 designed as a tension spring is tensioned. This tension spring is fastened on the one hand to the control element 21 and on the other hand to the blocking element 4. According to Figures 12a to 12c, the blocking element 4 is thus already in the blocking position B. By relaxing the Einziehkraftspeichers 1 1 enters the drive device 1 further in the position shown in Figures 13a to 13c, in which the movable furniture part 2 is still in an open position OS is located. During this retraction movement, the effect of the damping device 19 also sets in and acts Spring force of Einziehkraftspeichers 1 1 opposite. According to FIGS. 13a to 13c, the blocking element 4 has continued to rotate in a clockwise direction, so that the blocking cam 31 arrives at the end of the guideway 10. In this position, the rear part device 5 is fully charged.

Soon after the ejection roller 20 no longer contacts the rotary lever 30, the ejection roller 20 and the ejection lever 7 reach the position shown in FIG. 14, which corresponds to the closed position SS of the movable furniture part 2. In this case, the ejection roller 20 abuts against the locking element 9. Although the blocking element 4 is no longer contacted by the discharge roller 20, it is still in the blocking position B, but has already performed part of the return movement T by the return part device 5. However, this return movement T is delayed by a delay device. This retarding device can be designed, for example, in the form of a rotary damper arranged in the rotary bearing 32. Due to this retarding device, the movement of the blocking element 4 from the blocking position B to the release position F lasts between 0.2 seconds and 4 seconds. During this time, the ejection device 3 can not be unlocked, which is illustrated by FIGS. 15a to 15b described below:

Specifically, by comparison with FIG. 4a, it can be seen in FIG. 15a that the ejection lever 7 has again rotated clockwise around the pivot axis X owing to the movement of the movable furniture part 2 into the overpressure position ÜS. As a result, the ejection roller 20 moves away from the locking element 9, as a result of which this locking element 9 actually wishes to move in the release direction R via the control element 21 due to the force accumulator (not shown). However, according to FIG. 15b, this movement in the release direction R is prevented by the blocking cam 31 of the blocking element 4 abutting the blocking flank 33 of the guideway 10 formed in the locking base plate 8. It is therefore possible at most a slight movement of the locking element 9 in the release direction R, but not sufficient to release the ejection section A for the ejection lever 20. Thus, when overpressing the movable furniture part 2 in the overpressure position ÜS, as long as the blocking element 4 in the Blocking position B is located, no unlocking of the ejector 3 done. As long as an operator continues to exert pressure in the closing direction SR on the drawer (movable furniture part 2) located in the overpressure position ÜS, the blocking element 4 can not be moved into the release position 5 by the return part device 5. This is because the ejection roller 20 is not "full" - as is the case in the closed position SS - on the locking element 9, but the locking member 9 due to the unillustrated energy storage against the closed position SS offset by a short distance in the direction of release R. As a result of this offset, the axis of rotation of the rotary bearing 32 no longer coincides with the design of the guide track 10 and the blocking cam 31 can not move along the guide track 10 in the counterclockwise direction but wedges on the blocking edge 33 (see FIG That is, as long as an operator presses on the movable furniture part 2 located in the overpressure position ÜS, no movement of the blocking element 4 into the release position F can take place.

Only when the movable furniture part 2 is released, the ejection force memory 6 can relax a little again and pivot the ejection lever 7 counterclockwise, so that the locking element 9 returns to the position shown in FIG 14 via the ejection roller 20. In this position according to FIG. 14, the axis of rotation of the rotary bearing 32 coincides again with the radius of the guide track 10, so that the rear part device 5 can move the blocking element 4 counterclockwise in a time-delayed manner into the release position F shown in FIG. 3c. In this Figure 3c, the blocking cam 31 has overcome the blocking edge 33 and the blocking element 4 can be moved when overpressing the movable furniture part 2 in the Überdrückstellung ÜS along the straight portion 36 of the guideway 10 with the control element 21 and the locking element 9 in the release direction R, so As shown in Figure 4b, the ejection section A is released for the ejection roller 20.

In FIG. 16, the position of the movable furniture part 2 during a closing operation without being pushed through is shown schematically in a time-distance diagram. At the beginning of the closing movement is therefore the blocking element 4 still in the Release position F. At the same time the drive device 1 is moved along the clamping path S and then reaches the Einziehabschnitt E. During the movement of the movable furniture part 2 in Einziehabschnitt E, the blocking element 4 is moved from the release position F in the blocking position or switched. Even when reaching the closed position SS, the blocking element 4 is in the blocking position B. Since in normal closing when reaching the closed position SS no force is exerted from the outside on the movable furniture part 2, at the latest with the reaching of the closed position SS, the return movement T. Mit the end of this return movement T also enters the blocking element 4 again from the blocking position B in the release position F. Then, as indicated by the dotted representation, as long as desired to wait for the release. As soon as an operator wants to open the movable furniture part 2, this pushes in the closing direction SR on the movable furniture part 2, whereby this passes into the overpressure range Ü between the closed position SS and the overpressure position ÜS. Thereby, the ejection device 3 is unlocked and the movable furniture part 2 is ejected opening direction OR.

In contrast, in FIG. 17 the push-through protection of the present invention is shown schematically. Again, at first at the beginning of the closing movement of the movable furniture part 2, an unillustrated freewheel section traveled. As soon as the ejection roller 20 comes into contact with the control element 21, the tensioning section S of the drive device 1 is reached. During the movement along the Einziehabschnittes E, the blocking element 4 is moved from the release position F in the blocking position B. As a result, the movable furniture part 2 is not stopped when reaching the closed position SS, but there is a direct pushing of the movable furniture part 2 in the overpressure ÜS. Since the blocking element 4 is in the blocking position B, the ejection device 3 can not be unlocked and there is no ejection of the movable furniture part 2 in the opening direction OR despite overpressures. As long as the movable furniture part 2 remains in the overpressure position ÜS, as long as the blocking element 4 remains in the blocking position B (see puncturing). Only when the movable furniture part 2 is released, the movable furniture part 2 returns due to the ejection force memory 6 and the ejection lever 7 in the closed position SS (see detachment section l_). As soon as the movable furniture part 2 is in this closed position SS, the return movement T begins again by the rear part 5. After the same period as in Figure 16, this return movement T is completed and the blocking element 4 passes again from the blocking position B in the release position F. Subsequently, as shown in FIG. 16, it is possible to wait as long as possible for the triggering or unlocking to take place. The unlocking takes place again by overpressing in the overpressure position ÜS and subsequent ejection of the movable furniture part 2 of the ejection device 3 in the opening direction OR. FIGS. 18 to 23b show a further exemplary embodiment of the present invention, in which, above all, the blocking element 4 is designed differently. Reference is first made to FIG. 18. This corresponds to the position of the drive device 1 according to FIG. 9. That is to say, the movable furniture part 2 is being closed and the discharge roller 20 abuts against the tensioning section S of the control element 21. As a result, the entire control element 21 was moved as shown in FIG. 8 to FIG. With this movement, the blocking cam 31 is also moved to the left along the guide track 10 formed in the locking base plate 8 until the blocking cam 31 contacts the deflecting edge 38, as shown in FIG. In this Fig. 18, the movable furniture part 2 is in the open position OS. The locking element 9 is already in the locking position V. In this embodiment, the locking element 9 simultaneously forms the blocking element 4, wherein it is rotatable about the pivot bearing 32.

When, as shown in FIG. 19, the control member 21 is further moved during tightening, the blocking cam 31 is deflected by the deflecting edge 38, whereby the blocking member 4 rotates counterclockwise. In the region of the rotary bearing 32 and the blocking element 4 is a damping medium, which takes over the function of the return device 5. In this Fig. 19 thus is the blocking element 4 in the blocking position.

According to FIGS. 20a and 20b, during the further closing operation, the ejection roller 20 passes over the locking element 9 or the blocking element 4, whereby the closed position SS of the movable furniture part 2 is reached. If there is a direct pushing of the movable furniture part 2 in a Überdrückstellung ÜS, as shown in Fig. 21 a and 21 b, so lifts the ejection roller 20 from the locking element 9, but there is only a short movement of the entire control element 21, there this movement is stopped immediately by the meeting of the control cam 31 with the control edge 33. Thus, the blocking position B remains in this overpressure position ÜS at least for a short time. After a short period of a few seconds, the blocking element 4 is again rotated clockwise due to the decreasing force of the damping medium, whereby the blocking element 4 in the release position F of FIG. 22a and 22b passes. The ejection roller 20 is still on the blocking element 4 or on the locking element 9, which is why due to the given locking position V no unlocking and thus no ejection occurs.

Only when a "normal" or desired overpressure takes place from this position, an unlocking and an ejection takes place, as already described with reference to Figures 3 to 4. In this case, the ejection roller 20 arrives as shown in Figures 23a and 23b the ejection section A, since this was released by the control element 20. During this movement of the control element 21 to the right, the blocking cam 31 also travels along the guide track 10.

Thus, an alternative push-through protection is provided by the present invention, in which the unlocking of the ejection device 3 is prevented for a certain period of time after reaching the closed position SS. The unlocking is completely prevented, as long as the movable furniture part 2 is still in the overpressure position ÜS after pushing. According to the embodiment shown in this application, the ejection lever 7 is associated with the movable furniture part 2 and abuts a discharge stop 27 associated with the furniture body 14. Basically, however, the reversal variant is conceivable, according to which a furniture body 14 associated ejection lever 14, the movable furniture part 2 ejects. The individual components may all, in part or not be attached to the extension guide 16. This variant of the push-through protection applies mutatis mutandis to all variants. Above all, this push-through protection does not necessarily have to be limited to an ejection device 3 with a pivotable ejection lever 7, but of course it can also be correspondingly implemented accordingly with a linearly movable ejection element with a heart-shaped guideway. The movable furniture part 2 may be next to a drawer and a furniture flap, furniture door or the like.

Claims

claims

1 . Drive device (1) for a movable furniture part (2), with a lockable ejection device (3) for ejecting the movable furniture part (2) from a closed position (SS) to an open position (OS), wherein the ejection device (3) by overpressing the movable Furniture part (2) in a closing direction (SR) behind the closed position (SS) lying overpressure position (ÜS) can be unlocked, characterized by a blocking element (4),

- Has a blocking position (B), in which the blocking element (4) upon reaching the overpressure position (ÜS) prevents the release of the ejection device (3), and

- Which has a release position (F), in which the ejection device (3) upon reaching the overpressure position (ÜS) can be unlocked.

2. Drive device according to claim 1, characterized in that the blocking element (4) before reaching the closed position (SS) in the blocking position (B) is movable.

3. Drive device according to claim 2, characterized in that the blocking element (4) from the blocking position (B) in the release position (F) is movable, wherein the movable furniture part (2) upon return of the blocking element (4) in the release position ( F) is in the closed position (SS).

4. Drive device according to one of claims 1 to 3, characterized in that the blocking element (4) by a return device (5) from the blocking position (B) in the release position (F) is movable.

5. Drive device according to claim 4, characterized in that the return movement (T) of the return device (5) takes place with a time delay.

6. Drive device according to claim 5, characterized in that the return movement (T) between 0.2 seconds and 4 seconds, preferably between 0.3 seconds and 1 second lasts.

7. Drive device according to one of claims 1 to 6, characterized by one of an ejection force accumulator (6) kraftbeaufschlagten ejection lever (7) and along a locking base plate (8) movable locking element (9) on which the ejection lever (7) in the closed position (SS ), wherein in the closed position (SS) located in a locking position (V) locking element (9) blocks the path of the ejection lever (7) in an ejection section (A) and in overpressure position (ÜS) in a release position (G) located locking element (9) releases the path of the ejection lever (7) into the ejection section (A).

8. Drive device according to claim 7, characterized in that the blocking element (4) on the locking element (9) movable, preferably rotatable, is mounted.

9. Drive device according to claim 7 or 8, characterized in that the blocking element (4) in a closing movement of the ejection device (3), preferably of the ejection lever (7), in the blocking position (B) is movable.

10. Drive device according to one of claims 7 to 9, characterized in that in the blocking position (B) located blocking element (4) prevents the movement of the locking element (9) in the release position (F).

1 1. Drive device according to one of claims 7 to 10, characterized in that the blocking element (4) in a - preferably in the locking base plate (8) formed - guide track (10) is mounted limitedly movable.

12. Drive device according to claim 1 1, characterized in that the blocking element (4) in its blocking position (B) held in the guide track (10), preferably wedged, is.

13. Drive device according to one of claims 1 to 12, characterized by a - preferably from the ejection lever (7) formed - retraction device (35).

14. Drive device according to claim 13, characterized in that the Antnebsvorrichtung (1) has a control track (12), wherein the ejection lever (7) during ejection of the movable furniture part (2) on the ejection portion (A) of the control track (12) is applied, Clamping of the ejection force accumulator (6) at a clamping portion (S) of the control track (12) is applied and when retracting the movable furniture part (2) in the closed position (SS) in the function as a retraction device (35) on a retraction section (E) of the control track ( 12) is applied.

15. Furniture (13) with a drive device (1) according to one of claims 1 to 14.

16. A method for opening and closing a movable furniture part (2) with a drive device (1), in particular according to one of claims 1 to 14, with the following step for opening the movable furniture part (2):

- Ejecting the movable furniture part (2) from a closed position (SS) in an open position (OS) by a lockable ejection device (3), wherein the ejection device (3) by overpressing the movable furniture part (2) in a closing direction (SR) behind unlocking position (ÜS) lying in the closed position (SS) is unlocked,

characterized by the steps

- Moving a blocking element (4) of the drive device (1) when closing the movable furniture part (2) in a blocking position (B), in which the unlocking of the ejection device (3) upon reaching the overpressure position (ÜS) is prevented, and - Moving the blocking element (4) of the blocking position (B) in a release position (F), in which the unlocking of the ejection device (3) takes place upon reaching the overpressure position (ÜS).

17. The method according to claim 16, characterized in that the movement of the blocking element (4) from the blocking position (B) to the release position (F) in the closed position (SS) befindlichem movable furniture part (2) by a back-up device (5) delayed, preferably in a time between 0.2 and 4 seconds.