Drive device for a movable furniture part

A drive device for a movable furniture part, in particular a drawer, includes a housing, an ejection device which is arranged in the housing for ejecting the movable furniture part out of a closed position into an open position, and a retraction device which is arranged in the same housing for retracting the movable furniture part out of an open position into the closed position. The drive device has a first operating mode and a second operating mode. In the first operating mode, only the retraction device is operative while opening and closing the movable furniture part, and in the second operating mode, both the ejection device and the retraction device are operative while opening and closing the movable furniture part.

BACKGROUND OF THE INVENTION

The present invention relates to a drive device and to an item of furniture with such a drive device for a movable furniture part.

For many years there have been efforts in the industry of furniture fittings to incorporate as many movement functions of the movable furniture parts (e. g. drawers, furniture doors and furniture flaps) as possible into one drive device.

For example, EP 2 174 572 A1 shows an opening and closing device which discloses a retraction device (self-closing device) for retracting a movable furniture part into a closed position combined with an ejection device for ejecting the movable furniture part. This document, however, shows a non-generic prior art device as the retraction device and the ejection device are arranged in separate housings. As a consequence, the production effort and the mounting effort are larger. In the case of opening the movable furniture part by over-pressing from the closed position as well as in the case of opening by pulling the movable furniture part situated in the closed position, the unlocking is carried out by a switching element.

In a similar manner, in DE 10 2010 036 903 A1, the retraction device and the ejection device are also formed separately.

A further non-generic drive device is disclosed in WO 2014/165873 A1, also in which here the retraction device and the ejection device are also formed in independent housings. The ejection device can be coupled by a coupling entrainment member with the furniture carcass. The retraction device, in turn, can be coupled by a retraction entrainment member with a catch element of the ejection device. In the case of opening by over-pressing, an unlocking of the ejection device is carried out. In the case of opening by pulling, the ejection device remains locked and the coupling device is moving loosely relative to the ejection device together with the retraction device which is being tensioned.

A generic document is DE 199 35 120 A1, which discloses in a common housing a retraction device for retracting a movable furniture part into a closed position combined with an ejection device for ejecting the movable furniture part. In this document, all components are movably arranged on a common lower shell, and the cover of this lower shell is removed in the illustrations. The unlocking is carried out by over-pressing the movable furniture part in a closed position. An opening by pulling on the movable furniture part situated in the closed position is not mentioned in this document.

A further generic drive device is shown in DE 21 2012 000 231 U1. In this document, the retraction device as well as the ejection device are arranged in a common housing, and a retraction slider is displaceably supported in or on the ejection slider. In the case of opening by over-pressing, an unlocking is carried out by a locking pin moving away from a latch recess. Also, in the case of opening by pulling, the locking pin is released from the latch recess as this locking pin is moved against the force of an overload spring of an overload device. It is disadvantageous with this construction that the ejection force storage member is relaxing in the case of such an opening by pulling, which is why this ejection force storage member has to be tensioned subsequently. Of course, a locking of the locking pin also has to be carried out again.

In a very similar manner. in WO 2014/008521 A1 the ejection device and the retraction device are also arranged in a common housing. Also, here an unlocking is carried out in the case of opening by pulling, in which the latch element (corresponding to the locking pin) is unlocked. Thus, there are the same disadvantages as with the preceding document.

SUMMARY OF THE INVENTION

Therefore, the object of the present invention is to provide an improved drive device compared to the prior art. In particular, the disadvantages of the prior art shall be eliminated.

This object is achieved by a drive device having a first operating mode and a second operating mode, in which in the first operating mode only the retraction device is operative while opening and closing the movable furniture part, and in the second operating mode both the ejection device and the retraction device are operative while opening and closing the movable furniture part. Thus, it is possible for the first time that in the case of a compactly built drive device (ejection device and retraction device in a common housing) in the first operating mode, the ejection device is not influenced. This means, no unlocking of the ejection device is carried out. Such a drive device makes it possible for the first time that a compactly built drive device comprising all important movement function components can be mounted to an extension guide or to the a movable furniture part without necessarily knowing already when mounting whether the movable furniture part comprises a handle or is formed without a handle.

If the movable furniture part comprises a handle, the movable furniture part can always be operated without problems in the first operating mode of the drive device. This means, basically the ejection function is indeed included in the drive device. However, this ejection function does not have to be used, as the opening of the movable furniture part can be carried out by pulling on the handle. The ejection device always simply remains in the same (locking) position (i.e., remains fixed relative to the housing). The retraction function is used in the first operating mode just like as in already known retraction devices.

If, in contrast, the movable furniture does not comprise a handle, the movable furniture part with the same drive device can be operated in the second operating mode of the drive device. In the second operating mode, the opening of the movable furniture part is simply carried out by pressing onto the movable furniture part. When closing, the movable furniture part is actively retracted by the retraction device.

Put in other words, a drive device according to the invention comprising all movement function components can be pre-mounted on an extension guide or on a movable furniture part. Subsequently, this drive device is actuated depending on the drawer type (with handle or without handle) in the first operating mode or in the second operating mode. In particular, in the first operating mode, the locking device remains locked in the locking position while opening the movable furniture part by pulling the movable furniture part, and the retraction device is movable relative to the housing independent of the ejection device.

Preferably, exactly one entrainment member can be provided for the drive device, and both the ejection device and the retraction device can be triggered by the same entrainment member. This means that (for each extension guide) only one entrainment member is provided by way of which the ejection movement and the retraction movement of the drive device can be transmitted onto the movable furniture part and onto the furniture carcass, respectively.

An item of furniture with a furniture carcass, a movable furniture part, and a drive device according to the invention are provided as well.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1shows in a perspective view an item of furniture50with a furniture carcass51and three movable furniture parts2in form of drawers arranged above each other.

FIG. 2shows the movable furniture part2in an angled view from below, wherein the extension guides52are illustrated on the two sides. A drive device1for a movable furniture part2is arranged on each extension guide52, especially on each drawer rail54of the extension guide52. When there is a synchronizing device76for the ejection devices3and3′, then the two drive devices1—preferably formed mirror-symmetrical to each other—together form one common drive device1′. On each bottom side of the carcass rail53of the two extension guides52, a pin-formed entrainment member49is attached by a holding plate, which entrainment member49interacts with the corresponding drive device1. In this case, each drive device1is associated to the movable furniture part2(in particular to the drawer rail54), while the entrainment member49is fixed to the furniture carcass51. Thus, the drive device1quasi repels from the fixed entrainment member49. The described drive device1can also be used in an opposite manner, namely that the drive device1is mounted to the furniture carcass51or to the carcass rail53and acts on the entrainment member49—which then is associated to the movable furniture part2. Thereby, the entrainment member49—together with the movable furniture part2connected to the entrainment member49—is ejected in opening direction OR by the drive device1.

FIG. 3illustrates in a perspective view the extension guide52comprising the carcass rail53and the drawer rail54together with the drive device1mounted to the drawer rail54.FIG. 4ashows a sectional view through the drive device1and the extension guide52in the region of the synchronizing rod holder35. It can be seen herein that the extension guide52for a full extension also comprises a central rail55besides the carcass rail53and the drawer rail53. It is substantial that the ejection device3as well as the retraction device4is incorporated in a single housing, wherein this housing comprises the housing cover6and the housing base plate7(The remaining reference signs will be explained in the later drawings.). In principle, the housing6,7can also be formed in one piece. The single components do not have to be completely enclosed by the housing. Hence, the housing can clearly only be formed in the form of a base plate7on which the components are held. Preferably, the housing is formed in two pieces and substantially completely encloses the single components. By this one housing, in which the ejection device3as well as the retraction device4is arranged, an easier and faster mounting of the drive device1is possible.

In contrary,FIG. 5ashows the prior art as currently produced and sold. It can be seen at a first glance that the two substantial components of the drive device1—namely the ejection device3and also the retraction device4—are formed and arranged separate from each other. This means, the retraction device4is mounted to the drawer rail54via a separate housing, while the ejection device3is attached to the retraction device4(or also to the not shown bottom side of the movable furniture part2) also via a separate housing. A separate entrainment member (not shown here) has to be available for the ejection device3as well as for the retraction device4.

TheFIGS. 4band 5beach correspond to the previously mentionedFIGS. 4aand 5a, wherein both drawings show front views of the respective drive device.

The substantial components of the drive device1are described in the following with reference to theFIGS. 6 and 7. This drive device1comprises the housing cover6and the housing base plate7as the two enclosing elements connected to each other. In principle, also more components could of course form the housing. However, for a simple production and a production as little complex as possible, there are only exactly two housing parts. The drive device1can be mounted to the drawer rail54by the housing base plate7.

The two main components of the ejection device3(also referred to as TIP-ON mechanism or touch-latch-mechanism) are the ejection force storage member13as well as the ejection slider10which are movable along a longitudinal axis L. In this case, the ejection force storage member13is formed as a compression spring. Basically, this ejection force storage member13and also the ejection slider10could be directly attached to the housing or to a housing part. In this case, a separate ejection housing is provided which is designed in the form of an inner ejection housing11and an outer ejection housing12. The two other components (ejection force storage member13and ejection slider10) are at least partly guided in these ejection housing parts. A guiding bolt29is provided in order to maintain the positioning of the ejection force storage member13as exact as possible. Moreover, the separating element30is guided via a groove (in the guiding bolt29) and a projection (on the separating element30) on this guiding bolt29. This separating element30in the form of a washer serves to prevent a direct torque transmission between the ejection force storage member13and the ejection slider10in the case of a rotation of the ejection slider10about the rotational axis X oriented parallel to the longitudinal axis L and because of the torsion of the ejection force storage member13. A locking pin36is arranged on the end of the ejection slider10facing the ejection force storage member13. This locking pin36together with the cardioid-shaped locking guide track41formed in the ejection housing11,12and together with a locking element58integrally formed with the synchronizing coupling piece31(seeFIG. 9) forms a locking device56for the ejection device3.

For the basic function, it would be sufficient if the locking guide track41would be stationarily formed in this ejection housing11,12. A synchronizing coupling piece31is provided for a simple synchronization with the second drive device1arranged on the other side of the movable furniture part2. This synchronizing coupling piece31is movable in longitudinal direction L relative to the ejection housing11,12. This synchronizing coupling piece is actuated by the synchronizing force storage member32(in this case a compression spring). This synchronizing piece31can be connected to the synchronizing coupling counter piece33in a movement transmitting manner. The synchronizing coupling counter piece33is movably, preferably rotationally, supported in the synchronizing guide34of the housing. Concretely, a gear rack is formed on the synchronizing coupling piece31which meshes with a gear wheel formed on the synchronizing coupling counter piece33. A synchronizing rod77can be attached to the synchronizing coupling counter piece33. A synchronizing rod holder35is provided for a secure mounting. For the functional principle of this whole synchronizing device it can be exemplarily referred to the WO 2015/051386 A1.

Further, the drive device1comprises a retraction device4. The substantial parts of this retraction device4are the retraction force storage member18, the retraction slider15, the retraction latch14and the retraction locking track17. The retraction force storage member18is on the one side attached to the ejection force storage member base19of the housing base plate7and on the other hand attached to the retraction slider15. In principle, the retraction slider15can be directly lockable in an angled end section of the retraction locking track17. In this case, however, the retraction latch15is pivotally supported on the retraction slider15by the retraction connecting pin16, whereby the whole retraction slider15is lockable in a retraction locking position in an angled end section of the retraction locking track17by a retraction locking pin23attached to the retraction latch14. The retraction force storage member18is formed as a tension spring which moves the retraction slider15to the right according to the illustration inFIG. 6when relaxing.

This retraction movement per se can be carried out only by the force of the retraction force storage member18. However, in order to enable a soft retracting, the drive device1also comprises a damping device5for the retraction device4. For that purpose, the damping device5comprises a damping cylinder21and a damping piston20guided in the damping cylinder21. The damping cylinder21is held between the housing cover6and housing base plate7. The damping piston20is guided by the damping piston guide22. During its movement path, this damping piston20partially acts onto the intermediate piece24. This intermediate piece24is movably supported in a limited manner in the intermediate piece guide track39via corresponding guiding projections.

The drive device1further comprises a push element8and a coupling element9in order to enable that the retraction device4as well as the ejection device3can be incorporated in a single housing7,6. The coupling element9is shown in two pieces in the illustrations according toFIGS. 6 and 7. This, however, is only advantageous because of manufacturing reasons. Otherwise, this coupling element9can also be formed in one piece. The push element8, in turn, is slidably supported in the guide track28via corresponding projections. Also the catch hook25is guided in the guide track28. Moreover, the catch hook25is rotatably supported on the push element8by the catch hook rotary bearing27. Further, the catch hook force storage member26(in the form of a leg spring) is arranged between the catch hook25and the push element28. The catch hook force storage member26guarantees a secure locking of the catch hook25in the angled end section of the guide track28. For a compact construction, the housing6,7of the drive device1, the coupling element9, and the ejection slider10(carrier) are at least partly formed sleeve-shaped or cylindrical. In particular, the ejection housing11,12together with the locking guide track41formed therein, the coupling element9together with the coupling track45formed therein and the housing6,7together with the control track40formed therein are cylindrically formed, wherein the locking guide track41, the coupling track45and the control track40each are formed on a, preferably inward facing, cylinder jacket surface vaulted about the rotational axis X.

FIG. 8shows the housing cover6and the housing base plate7in an unfolded state so that the details formed therein are better visible. The retraction locking guide tracks17for the retraction latch14, the guide tracks28for the catch hook25and the push element8as well as the intermediate piece guide track39are each mirror-symmetrically formed in the two housing parts6and7. In contrast, the retraction force storage member base19and the damping piston guide22are formed in or on the housing base plate7. Moreover, the synchronizing guide34as well as the opening57can be seen on or in the housing cover6. The synchronizing coupling piece34projects from the housing through this opening57.

FIG. 9in a two different perspectives shows an insight of an ejection housing11,12cut in half. It can be determined that parts of the locking guide track41for the locking pin36are formed in the inner ejection housing11as well as in the outer ejection housing12. In addition, the latch recess R is partly formed by the inner ejection housing11and partly formed by the locking element58. The locking pin36is schematically shown in the lower illustration ofFIG. 9when this locking pin36is locked in the latch recess R.

In the case of an unlocking of the locking device56by over-pressing the movable furniture part2in closing direction SR, the locking pin36is moved in the direction of the deflection slope42and is deflected by this deflection slope42so that the locking pin36reaches an ejection section of the locking guide track41. After releasing the movable furniture part2the locking pin36contacts the locking element58on a front side (seeFIG. 10), whereby the force of the ejection force storage member13ejects the ejection slider10together with the locking pin36attached thereon in opening direction OR.

Subsequently, the locking element58—which is integrally formed with the synchronizing coupling piece31—is further moved in opening direction OR until the position according toFIG. 11is reached. In this position, the locking pin36is just deflected again by an inclined surface in the ejection section of the locking guide track41(see lower illustration ofFIG. 11).

FIG. 12illustrates in different views that the ejection slider10comprises two opposite locking pins36on its end directed towards the ejection force storage member13. A hemisphere-shaped abutment43is provided on the end remote from the ejection force storage member13. This abutment43serves for minimizing the torque between the touching parts (ejection slider10and coupling element9). On this end, moreover, a recess is provided in which a coupling pin37(not shown here) can be attached.

FIGS. 13ato 13dstill show different, partly cut or partly transparent views of the sleeve-shaped coupling element9. The control pin38is formed on the coupling element9. In addition, the bajonet-like coupling parts44are provided on a top end. In the interior of these coupling elements9—this means on the inward cylinder jacket surface—two identical coupling tracks45are formed. The coupling tracks45are shifted to each other by 180°. These coupling tracks45comprise a continuous freewheel section46for the coupling pin37arranged on the ejection slider10.

Such a coupling track45is illustrated inFIG. 14. This coupling track45comprises the three sections freewheel section46, guiding and idling section47as well as holding section48. The coupling pin37is movable in this coupling track45.

In contrast,FIG. 15shows the control track40formed on a cylinder-jacket-shaped inner side of the housing cover6projected onto a flat surface. The control pin38arranged on the coupling element9moves in this control track40. Depending on the position of the control pin38in the control track40, the coupling element9is coupled by means of the bajonet-like coupling parts44with the push element8(coupling region K) or uncoupled (uncoupling region EK). In addition, also the relative movements of the coupling element9and the ejection slider10to each other about the rotational axis X oriented parallel to the longitudinal direction L is controlled by this control track40. These entire control movements are demonstrated in the movement sequence of the whole drive device1illustrated and explained in more details in the followingFIGS. 16 to 31.

Referring toFIG. 16, it shall initially be noted that the drive device1is illustrated in an assembled state without the housing cover6. Moreover, the single components are illustrated partially transparent (see dashed line). InFIG. 16, the movable furniture part2is in a closed position SS. In addition, the locking device56is in a locking position VS as the locking pin36(see the upper detail) is locked in the latch recess R of the locking guide track41. The ejection force storage member13presses via the separating element30onto the locking pin36arranged on the ejection slider10, so that the locking pin36cannot be moved relative to the inner ejection housing11(which in fact is fixedly connected to the housing6,7). The locking element58formed by the synchronizing coupling piece31is jointly forming the latch recess R of the locking guide track41. In the lower detail ofFIG. 16, moreover, the end region of the coupling element9with the bajonet-like coupling parts44is illustrated. In the closed position SS, the coupling element9is not coupled to the push element8. Further,FIG. 15shows that the retraction force storage member18is not tensioned. The retraction latch14contacts the push nose60of the push element8with its catch section59.

If now pressing in closing direction SR onto the movable furniture part2starting from the closed position SS according toFIG. 16, the unlocking is carried out as illustrated inFIG. 17.

Thereby, the second operating mode B2of the drive device1is initiated. As in the preferred embodiment, the drive device1is arranged on the movable furniture part2, the housing6,7of the drive device1is moved in closing direction SR (inFIG. 17to the left). As, however, the catch hook25abuts the schematically illustrated entrainment member49fixed to the furniture carcass51, the ejection slider10abutting the coupling element9is moved—by the catch hook25, by the push element8connected to the catch hook25and by the coupling element9abutting the push element8—relative to the remaining components of the drive device1against the force of the ejection force storage member13until the locking pin36abuts the deflection slope42of the locking guide track41and via this deflection slope42reaches the position according toFIG. 17in the ejection section of the locking guide track41. Thereby, the locking device56is no longer in the locking position56but is rather unlocked (unlocking position ES). The over-pressing path is about 1 to 3 mm. If the housing6,7is not arranged on the movable furniture part2but rather on the furniture carcass51, in principle the same relative movement between the single components of the drive device1is carried out when over-pressing. In that case, however,—in contrast to the arrow SR inFIG. 17—the ejection slider10is moved to the right in the closing direction SR by the moved entrainment member49arranged on the movable furniture part2.

If then, starting from the over-pressing position US, the movable furniture part2is no longer pressed, the ejection force storage member13can start to relax according to FIG.18. This relaxing ejection force storage member13thereby presses onto the ejection slider10, whereby the locking pin36abuts the front face of the locking element58of the synchronizing coupling piece31. As a consequence, the whole synchronizing coupling piece31is moved relative to the ejection housing11,12. By this movement also the gear rack of the synchronizing coupling piece31meshes with the gear wheel of the synchronizing coupling counter piece33(see detail ofFIG. 18). Thus, also in the drive device arranged on the other side of the movable furniture part2(not shown) an unlocking is triggered (see still laterFIG. 33). By the beginning relaxation of the ejection force storage member13, the housing6,7is also moved relative to the ejection element10, to the coupling element9, to the push element8and to the catch hook25in opening direction OR. As the push element8entrains the retraction latch14via the push nose60, the tensioning of the retraction force storage member18also begins. Therefore, the spring force of the ejection force storage member13is larger than the spring force of the retraction force storage member18. For explanation in each of theFIGS. 16 to 18part sections, especially of the outer ejection housing12, are partly hidden so that a better insight into the interior of the ejection housing11,12is possible.

According toFIG. 19, the movable furniture part2has been still further ejected and a first slight open position OS is reached. Because of the design of the locking guide track41in the outer ejection housing12—as can be seen in the detailed view from below—the locking pin36is further deflected so that this locking pin36is evading the locking element58(see alsoFIG. 11). As the locking pin36in this position also no longer presses onto the synchronizing coupling piece31, the synchronizing force storage member32can relax and moves the synchronizing coupling piece31again into the position e. g. according toFIG. 16.

InFIG. 20, the ejection or opening movement has further continued. The ejection force storage member13is relaxed already for a large part, at least so far that the retraction force storage member18is fully tensioned. In this fully tensioned position of the retraction force storage member18the retraction latch14has been pivoted about the retraction connecting pin16relative to the retraction slider15so that the retraction locking pin23is locked in the angled end section of the retraction locking track17(see detail ofFIG. 20). By this pivoting movement, the push nose60of the push element8also no longer abuts in the catch section59of the retraction latch14. In thisFIG. 20, it is also recognizable that the intermediate piece24has reached an end abutment of the intermediate piece guide track39because of the trail movement of the damping piston20. Further, it is particular important to mention in connection withFIG. 20(as also with the following drawings) that the housing cover6is partly unhidden. This housing cover6is cut or unhidden so far that in the remaining illustrated housing cover6the control track40exactly remains. This illustration only serves for demonstrative reasons. Thus, it can be seen inFIG. 20that the control pin38on the coupling element9has already travelled a significant part of the ejection control track section61(see alsoFIG. 15).

In each upper entire view of theFIGS. 21 to 31, an outer region of the housing cover6is hidden so that the position of the control pin38in the control track40is well visible in the remaining inner region of the housing cover6. In the lower entire views of theseFIGS. 21 to 31, this housing cover6is completely hidden. Instead, an outer region of the coupling element9is hidden so that the position of the coupling pin37in the coupling track45is well visible in the remaining inner region of the coupling element9. Therebetween, details of each above shown entire view is always illustrated.

According toFIG. 21, the ejection force storage member13has fully relaxed. As a consequence, in the upper detail ofFIG. 21, it is visible on the one hand that the push element8has still further moved away from the retraction latch14of the tensioned retraction device4. On the other hand, the control pin38has moved through the coupling control track section62of the control track40. As a consequence, a rotational movement of the coupling element9relative to the housing cover6is triggered, whereby the bajonet-like coupling part44of the coupling element9—as shown in the lower detail ofFIG. 21—couples with a projection71formed on the push element8. Thereby, the uncoupling position EK is no longer given, but rather the coupling position K between the push element8and the coupling element9is reached. Starting from this position according toFIG. 21, the further opening movement is carried out without an influence by one of the force storage members13or18. The further opening movement can still be effected by the momentum of the force which has been introduced by the ejection force storage member13into the movable furniture part2or by actively pulling the movable furniture part2.

By this further opening movement according toFIG. 22, the control pin38is further moved through the shifting control track section63of the control track40. Starting from the position according toFIG. 21, the ejection slider10can also no longer be moved further as an end abutment for the locking pin36in the ejection housing11,12is reached (not shown). As starting from reaching the coupling position K, the coupling element9is jointly moved by the push element8. In the case of a further opening movement, a relative movement of the coupling element9to the ejection slider10is effected. As a consequence, the coupling pin37arranged on the end of the ejection slider10remote from the ejection force storage member13travels from the freewheel section46into the guiding and idling section47of the coupling track45in the coupling element9. For explanation in this detail—similar to the housing cover6in the upper detail—a radially outer region of the coupling element9is hidden so that a direct view onto the remaining coupling track45in the coupling element9is possible. Also this only serves for demonstration.

Finally, according toFIG. 23, the remaining opening path is also completed so that the catch hook25has been deflected into the angled end section of the guide track28. The catch hook25is held in this position by the catch hook force storage member26. According to the lower detail ofFIG. 23, the coupling pin37on the ejection slider10has also moved in the angled holding section48of the coupling track45of the coupling element9with this remaining opening movement. By the inclined design of the coupling track45in the holding section48, the coupling element9is rotated relative to the ejection slider10. This rotational movement also causes, as shown in the upper detail ofFIG. 23, the control pin38to be moved through the redirecting control track section64of the control track40. InFIG. 23, the entrainment member49has only just contacted the catch hook25.

In contrast, inFIG. 24, the entrainment member49already has lifted or moved away from the catch hook25. Thereby, the movable furniture part2is in a freewheel. During this freewheel, all components of the drive device1remain in the position. This means, the retraction force storage member18is tensioned and the ejection force storage member13is relaxed.

According toFIG. 25, the closing movement of the movable furniture part2begins. As the entrainment member49is reaching contact with the catch hook25, the catch hook25is released from the angled end section of the guide track28against the force of the catch hook force storage member26. According toFIG. 25, the coupling element9has already been displaced slightly to the right by the push element8abutting the coupling element9. As the ejection element10is actuated by the ejection force storage member13, the coupling pin37touches the holding surface72of the control track45according to the lower detail ofFIG. 25. The holding surface72is oriented rectangular to the longitudinal axis L or is formed slightly undercut. As in this case, the forces of the coupling element9substantially vertically act onto the coupling pin37, the coupling pin37is jointly moved by the coupling element9in the case of a further pushing movement. In the case of the pushing movement, the control pin38is moved through the straight tensioning control track section65of the control track40. This is particularly caused by the fact that the coupling pin37is in contact with the undercut holding surface72.

The ejection force storage member13is tensioned from the position according toFIG. 25to the position according toFIG. 26as the ejection element10is moved by the catch hook28, the push element8, and the coupling element9against the force of the ejection force storage member13by the coupling pin37abutting the holding surface72of the control track45. InFIG. 26, the control pin38has already travelled a part of the path in the deflection control track section66of the control track40. This deflection control track section66causes a rotation of the coupling element9relative to the housing cover6. By this rotation of the coupling element9, the coupling pin37is simultaneously released from the holding surface72of the coupling track45according to the lower detail ofFIG. 26and reaches an inclined section73of the control track45. In the case of abutting this inclined section73, the ejection force storage member13is still tensioned. Because of the contact to the inclined section73, the coupling pin37wants to evade upwards relative to the inclined section73and wants to push the coupling element9respectively. However, both movements are not yet possible in the position according toFIG. 26. A further downward movement of the coupling element9relative to the coupling pin37is indeed possible only so far until the control pin38attached to the coupling element9abuts the holding control track section67of the control track40. This means, in the position of the control pin38indicated in dashed lines in the upper detail ofFIG. 26, the relative movement between the housing cover6and the coupling element9has not yet progressed so far that the coupling pin37could come to the guiding and idling section47of the coupling track45. On the other hand, an upward movement of the coupling pin37relative to the coupling pin9is not possible as the locking pin36on the end of the ejection slider10facing the ejection force storage member13cannot yet move upwards as the locking pin36is still located in the tensioning section78of the locking guide track41.

InFIG. 27, however, the ejection force storage member13is now tensioned so far that the locking pin36is no longer held in the tensioning section78but rather is able to reach a curved section79of the locking guide track41. This movement of the locking pin36into the curved section79is carried out in a controlled manner by the coupling track45. This means, as can be seen in the left detail ofFIG. 27, the coupling pin37indeed abuts the inclined section73of the control track45. As the locking pin36has reached the curved section79, the ejection slider10is not able to rotate.

This rotational movement is coordinated in such a manner that the coupling pin37reaches the guiding and idling section47when the locking pin36is exactly located in a pre-locking section74of the locking guide track41(seeFIG. 28). The pre-locking section74is oriented rectangular to the longitudinal axis L. While the locking pin36is located in this pre-locking section74, the ejection force storage member13is tensioned and a pre-locking position VV is reached. For details to this pre-locking position VV, it shall exemplarily be referred to the WO 2014/165878 A1. This pre-locking position VV enables a through-pressing protection so that an undesired unlocking does not immediately occur when closing. In FIG.28, it is also recognizable that directly after reaching the pre-locking position VV or upon reaching this position, the push nose60of the push element8engages the retraction latch14and releases this retraction latch14from the angled end section of the retraction locking track17. As a consequence, the retraction force storage member18starts to relax and the movable furniture part2is actively retracted in closing direction SR.

InFIG. 29, about half of the retraction path has already travelled. The retraction force storage member18has already relaxed for a large part. This retraction movement is damped by the damping piston20of the damping device5as the damping piston20acts in a braking manner onto the push element8via the intermediate piece24. In the upper detail ofFIG. 29the control pin38has reached the latching control track section68of the control track40. By the inclined design of this latching control track section68, the coupling element9rotated upwards relative to the housing cover6. As the coupling pin37simultaneously abuts the guiding and idling section47of the upward rotating coupling track45, the ejection slider10is also slightly rotated upwards. As a consequence, according to the lower right detail ofFIG. 29, the locking pin36is moved away from the pre-locking section74and moves along the latching slope into the latch recess R of the locking device56. Thus, the movement of the locking pin36from the pre-locking section74into the latch recess R is also controlled by the control track40and the coupling track45and the corresponding control pin38and coupling pin37. Therefore, a smooth and quiet placing of the locking pin36in the latch recess R is reached. The control track40, the control pin38guided in the control track40, the coupling track45in the coupling element9, and the coupling pin37guided in the coupling track45and arranged on the ejection slider10together form the control device for controlling the movement of the locking pin36arranged on the ejection slider10and guided in the locking guide track41.

According toFIG. 30, the locking pin36has finally reached the latch recess R and the locking device56is in the locking position VS. Simultaneously, the coupling pin37is in the freewheel section46of the coupling track45according to the detail bottom left. In the upper detail, the control pin38has moved into the uncoupling control track section69of the control track40. As a consequence, a rotational movement of the coupling element9relative to the housing cover6about 70° to 150°, preferably about circa 120°, is triggered. In order to not hinder this relatively large rotational movement of the coupling element9, the coupling pin37is located in the freewheel section46of the coupling element9as the ejection slider10indeed cannot rotate because of the locking of the locking pin36. Also, the ejection slider10is freely rotatable relative to the coupling element9by this freewheel section46. The retraction movement by the retraction device4is almost completed inFIG. 30.

InFIG. 31, finally, the closed position SS of the movable furniture part2is reached. The control pin38is again located in an uncoupling region EK of the control track40, in which the coupling between the coupling element9and the push element8is released.FIG. 31again corresponds to the starting position according toFIG. 15.

InFIG. 32a further important function of the present drive device1is recognizable. With the present drive device1, it is specifically possible, without having to use an overload device or other auxiliary devices, to pull the movable furniture part2from the closed position SS in an opening direction OR without generating damages. This means, not only an opening of the movable furniture part2by over-pressing and thus triggered unlocking as in the second operating mode B2(described above) is possible, but rather also a pulling of the movable furniture part2can be carried out. This is possible in such a way that in the closed position SS, the coupling element9is uncoupled from the push element8. As a consequence, the locking device56maintains the locking position VS and also the ejection device3remains unchanged (i.e., remains inactive and does not move relative to the housing). By this opening by pulling in a first operating mode B1, only the retraction device4is actively and manually tensioned so that in the case of a further closing, a smooth closing sequence is guaranteed (i.e., only the retraction device is operative an moves relative to the housing). For detailed information to this function, reference is made to WO 2014/165873 A1.

In principle, it is possible that the drive device1comprises separate entrainment members for coupling the ejection device3and the retraction device4with the movable furniture and with the furniture carcass51, respectively. For a simple design and mounting, however, it is preferably provided that the drive device1comprises only one entrainment member49. The ejection device3as well as the retraction device4can be triggered by this single entrainment member49. The first operating mode B1can be activated by this entrainment member49by pulling the movable furniture part2situated in the closed position SS. The second operating mode B2can be activated by this entrainment member49by pressing onto the movable furniture part2situated in the closed position SS.

A further function of the drive device1is illustrated inFIG. 33. According to this illustration, the unlocking of the locking pin36from the latch recess is not carried out by over-pressing, but rather in such a way that the drive device located on the other side (shown inFIG. 2) is unlocked by over-pressing. By way of the locking device56of the other drive device and especially by the synchronizing coupling piece31moving during opening, a movement is transmitted to the synchronizing coupling counter piece33and the synchronizing rod76(shown inFIG. 2) so that in the case of the drive device1shown inFIG. 33, the synchronizing coupling piece31is also moved during the just beginning opening movement. As the synchronizing coupling piece31is integrally formed with the locking element58, the locking element58no longer jointly forms the latch recess R, whereby the locking pin36is able to reach the ejection section because of the inclined locking guide track41and because of the spring-actuation by the ejection force storage member13. For details to this function, reference is made to WO 2015/051386 A2.

Finally, reference is made toFIG. 34, in which a through-pressing movement is illustrated. In the case of this through-pressing movement, the locking pin36is moved from the pre-locking section74into the through-pressing track75of the locking guide track41. Simultaneously, the control pin38is also located in a through-pressing control track section70of the control track40. By this function and especially by the through-pressing track75, a direct through-pressing and thus over-pressing and triggering is prevented from happening when closing. Thus, the locking pin36cannot directly reach the ejection section of the locking guide track41.

LIST OF REFERENCE SIGNS