Drive device for a movable furniture part

Abstract

The invention relates to an actuating device (1) for a movable piece of furniture (2), in particular for a drawer, comprising a support (3), an ejection device (4) for ejecting the movable piece of furniture (2) from a closed position (SS) to an open position (OS), a locking device (5) for locking the ejection device (4) in the locked position (VS), wherein the locking device (5) has a locking pin (51) connected to the ejection device (4) and a guide (52) for the locking pin (51) formed at least partially in or on the support (3), wherein the locking pin (51) is locked in a coupling recess (R) of the guide (52) in the locked position (VS), as well as a synchronizing device (6) that is movable with respect to the support (3) to synchronize the movement of the actuating device (1) with a second actuating device (1').where the synchronizing device (6) has a transmission element (60) that can be moved by means of the locking pin (51), wherein the transmission element (60) remains stationary at least during overpressure movement, can be moved by the locking pin (51) with an opening movement and can be moved by the locking pin (51) with a closing movement, wherein the transmission element (60) is linearly and movably mounted on the support (3).

Description

[0001] The present invention relates to a drive device for a movable furniture part, in particular for a drawer, according to the preamble of claim 1. The invention further relates to an arrangement with two synchronized drive devices. In addition, the invention relates to a piece of furniture with such a drive device.

[0002] For many years, furniture fittings have been manufactured and used to support the movement of movable furniture parts (such as drawers, cabinet doors, and cabinet flaps). A well-known example is the touch-latch mechanism, which triggers an opening movement by pressing on the movable furniture part. Pressing ("touch") on the movable furniture part, which is in the closed position, releases a latch, allowing the ejector mechanism to open the movable furniture part.

[0003] An example of such a furniture fitting or drive device is disclosed in WO 2017 / 004638 A1. After being pressed at the beginning of the opening movement, the locking pin moves a locking element formed on the partially sleeve-shaped synchronizing coupling. This synchronizing coupling corresponds to the transmission element of the present invention. However, WO 2017 / 004638 A1 does not constitute prior art, as the synchronizing coupling is only moved by the locking pin during an opening movement. During a closing movement of the movable furniture part, no motion is transmitted from the locking pin to the synchronizing coupling.Rather, according to this document, once the locking pin is no longer in contact with the synchronizing coupling, the synchronizing energy storage device moves the coupling piece back into the position where the locking element on the coupling piece again forms the detent recess of the guide track. A disadvantage of this document is that an additional energy storage device is required, and that this energy storage device can cause uncontrolled synchronization of a second drive device.

[0004] In contrast, EP 3 054 811 B1 discloses a generic drive device. In this device, the coupling element corresponds to the transmission element of the present invention. The locking element, which forms the detent recess, is formed on this coupling element. This coupling element is not actuated by a power storage device. Rather, during a closing movement, the locking pin moves the coupling element into the position in which the locking element arranged on the coupling element again forms the detent recess of the guide track. A disadvantage of this design is that the rotatable coupling element is relatively large and requires considerable space. Furthermore, synchronization with the numerous levers and components required due to the rotary movement of the coupling element is quite complex.

[0005] Another drive device is described in document DE 20 2009 013 733 U1, in which a plunger of an ejection device is pressed in by contact with a release element when a movable part of furniture is closed.

[0006] The object of the present invention is therefore to create a drive device that is an alternative to or improved upon the prior art. In particular, the known disadvantages of the prior art are to be overcome. Above all, the drive device should have a simple design, require relatively little space, and comprise few components.

[0007] This is achieved by a drive device with the features of claim 1. According to the invention, the transmission element is mounted on the carrier so as to be linearly movable. Thus, a cumbersome and relatively space-consuming rotary movement of the transmission element is not necessary.

[0008] As stated at the outset, protection is also sought for a method for driving a movable piece of furniture, in particular a drawer, via a drive device with a carrier, an ejection device for ejecting the movable furniture part from a closed position to an open position, wherein the ejection device is unlocked from a locked position by an overpressure movement of the movable furniture part into an overpressure position located behind the closed position, a locking device for locking the ejection device in the locked position, wherein the locking device has a locking pin connected to the ejection device and a guide track for the locking pin formed at least partially in or on the carrier, wherein the locking pin is locked in a detent recess of the guide track in the locked position, and a synchronizing device movable relative to the carrier for synchronizing the movement of the drive device with a second drive device,wherein the synchronization device has a transmission element movable by the locking pin, wherein the transmission element is linearly movable and mounted on the carrier, characterized by the following process steps: moving the transmission element by the locking pin during a closing movement, stopping the transmission element at least during the overpressure movement, and moving the transmission element by the locking pin during an opening movement.

[0009] Preferred embodiments of the invention are defined in the dependent claims.

[0010] For example, it is preferred that the guide track has a heart-shaped section.

[0011] Furthermore, it is preferably provided that a locking element forming the guide track for the locking pin is arranged on the transmission element.

[0012] It is also preferably provided that the locking pin is locked in the detent recess of the guide track in the locked position, wherein the detent recess is at least partially formed by this locking element which is movable relative to the carrier, and wherein the locking pin is held on the locking element in the locked position, preferably on a retaining surface formed on the locking element. Specifically, it is provided that, starting from a detent recess formation position, the locking element is linearly movable in the opposite direction to the direction in which the locking pin moves during the overriding movement.

[0013] The ejection device preferably comprises an ejection slide movable relative to the carrier and an ejection force storage device attached to the carrier on one side and to the ejection slide on the other. Preferably, the ejection force storage device is designed as a spring, more preferably as a tension spring.

[0014] According to the invention, the transmission element has a first transmission stop projecting into an opening section of the guide track, wherein the transmission element is movable over this first transmission stop from the locking pin during the opening movement. This movement can thus be transmitted to a second drive device.

[0015] It is particularly preferred that the first transmission stop is formed by an end face on the locking element, preferably oriented transversely to the holding surface. Thus, the locking element has a dual function: one part (specifically the holding surface) serves to lock or latch the locking pin, and another part (specifically the end face) is provided for transmitting motion to a second drive device.

[0016] Furthermore, according to the invention, the transmission element has a second transmission stop projecting into a closing section of the guide track, wherein the transmission element can be moved from the locking pin over this second transmission stop during the closing movement.

[0017] Specifically, it is provided that, preferably exclusively, the locking element can be moved into a detent formation position by the movement of the transmission element triggered by the locking pin via the second transmission stop during the closing movement, in which the locking element forms the detent recess of the guide track.

[0018] Furthermore, according to the invention, it is provided that the second transmission stop can be moved by the locking pin from a stop position to a deflection position in which the locking pin releases itself from the second transmission stop.

[0019] Thus, the locking pin is no longer in contact with the second transmission stop. The second transmission stop is therefore moved by the locking pin into a position where it no longer protrudes into the guide track. In other words, the second transmission stop is only engaged by the locking pin during a portion of the closing movement.

[0020] Preferably, it is provided that by moving the second transmission stop into the escape position, a further movement of the locking pin into a detent section is released.

[0021] To avoid the need for complex, continuous synchronization between the drive devices, it is particularly preferred that the transmission element remains stationary during movement of the locking pin in both the engagement and over-pressing phases. This means that no motion transmission is required, especially during engagement and over-pressing. Thus, for example, when unlocking by over-pressing, the movable furniture component only needs to be moved against the force of the ejection force storage unit of a drive device.

[0022] Furthermore, it is preferably provided that the synchronization device has a synchronization coupling element connected to the transmission element. Specifically, this synchronization coupling element can have several spaced-apart teeth which can be coupled to a gear-shaped synchronization coupling counter-element in a motion-transmitting manner.

[0023] In principle, it is possible for the transmission element to have a carrier body to which the two transmission stops (and also the synchronization coupling element) are detachably attached. However, for a simpler design, it is preferred that the transmission element has a carrier body in which the first transmission stop, the second transmission stop, and / or the synchronization coupling element are formed integrally with the carrier body. Thus, a single component performs several functions.

[0024] The drive device described so far does not necessarily need to be used for synchronization or for transferring motion to a second drive device. Rather, such a drive device can also be installed individually (and on one side) in a piece of furniture. While this drive device then (somewhat unnecessarily) includes the components for synchronization, it is advantageous because only one type of drive device (i.e., always with synchronization components) needs to be produced. This simplifies, for example, inventory management and streamlines or standardizes production.

[0025] However, protection is sought not only for a single drive device, but also for an arrangement comprising a (first) drive device according to the invention and a second drive device according to the invention synchronized with it. Preferably, this arrangement also includes a synchronizing rod for connecting the synchronizing devices, in particular the synchronizing coupling elements, of the two drive devices.

[0026] Furthermore, protection is sought for a piece of furniture comprising a furniture body, at least one furniture part movable relative to the furniture body, and a drive device according to the invention or an arrangement with two drive devices. It is preferred that these two drive devices are mounted on opposite sides of the furniture body or the movable furniture part.

[0027] The drive mechanism supports can be attached to the movable furniture part (or to a drawer slide of a drawer runner), in which case the ejection devices, along with the movable furniture part, are pushed away by (the furniture carcass) carriers. Preferably, however, the drive mechanism supports are attached to the furniture carcass (preferably each to a carcass rail of a drawer runner), with the ejection devices moving the movable furniture part relative to the furniture carcass in the opening direction via (the movable furniture part) carriers.

[0028] Further details and advantages of the present invention are explained in more detail below with reference to the description of the figures and the exemplary embodiments illustrated in the drawings. These show: Fig. 1 schematically a piece of furniture with several movable furniture parts in the form of drawers, Fig. 2 perspective view of a drawer with drawer slides and a drive device for a movable furniture part, Fig. 3 an arrangement of two synchronized drive devices, Fig. 4 perspective exploded view of the drive device, Figs. 5a-5c various views of the drive device in the open position, Figs. 6a-6b various views of the drive device when closing, Figs. 7a-7c various views of the drive device when the locking pin strikes the second transmission stop, Figs. 8a-8c various views of the drive device when the locking pin releases from the second transmission stop, Figs. 9a-9c various views of the drive device in the closed position, Figs. 10a-10c various views of the drive device in the locked position, Figs. 11a-11c various views of the drive device in the overpressure position, Fig.Figs. 12a-12c: Various views of the drive device when the locking pin strikes the first transmission stop; Figs. 13a-13c: Various views of the drive device when the locking pin releases from the first transmission stop; Figs. 14a-14c: Various views of the drive device during the ejection movement; Fig. 15: A top view of part of the drive device with the locking pin in the free-running channel; and Figs. 16a-16c: Various views of the drive device in the open position.

[0029] In Fig. 1 The figure shows a piece of furniture 8 with a furniture carcass 9 and a total of four movable furniture parts 2. Each furniture part 2 consists of at least a drawer 10 and a front panel 11. The movable furniture parts 2 are attached to the furniture carcass 9 via a drawer slide 12, consisting of a drawer rail 13 and a carcass rail 14 (and optionally a center rail not shown).

[0030] The top drawer is schematically shown with a drive device 1. The drive device 1 has a support 3. In this case, this support 3 is attached to the drawer rail 13 (in the schematic representation according to Fig. 1 The support 3 corresponds to the drawer rail 13). The drive device 1 has an ejection device 4, the ejection slide 41 and the ejection force storage unit 42 of this ejection device 4 being shown schematically. The locking device 5 has a guide track 52 formed in the support and the locking pin 51 guided in the (in this case heart-shaped) guide track 52. A driver 15 is arranged on the cabinet rail 14 (or on the furniture cabinet 9 itself), with which the ejection device 4 engages at least partially. However, the arrangement can also be reversed: that is, the drive device 1 is associated with the cabinet rail 14, while the driver 15 is associated with the movable furniture part 2. This top drawer is in the open position OS.

[0031] When the drawer is moved from its open position OS in the closing direction SR, the locking pin 51 moves in the closing section C of the guide track 52 (see below for details). During this movement, the ejection force accumulator 42 is tensioned by a relative movement between the ejection slide 41 and the support 3.

[0032] In the closed position (third drawer from the top), the ejection force storage unit 42 is fully tensioned. This closed position SS can be achieved by a purely manual closing movement. Alternatively, the movable furniture part 2 – if present – ​​can be moved or retracted into the closed position SS by the retraction device 16, which is only shown schematically and is integrated into the extension guide 12.

[0033] Starting from this closed position SS, the movable furniture part 2 is moved into the overpressure position ÜS (bottom drawer in) by pressing on the movable furniture part 2. Fig. 1 This unlocks the locking device 5. After the over-pressing action in the closing direction SR, and as soon as the user releases the movable furniture part 2, the drive device 1 ejects the movable furniture part 2 in the opening direction OR. This brings the movable furniture part 2 into the open position OS corresponding to the second drawer from the top. In this position, the drawer can be accessed, for example, by grasping the front panel 11 and manually moved further into the position corresponding to the first drawer from the top.

[0034] In Fig. 2 A movable furniture part 2 in the form of a drawer with a drawer compartment 10 and a front panel 11 is shown in perspective. A drawer slide 12 with a drawer rail 13 and a cabinet rail 14 is also shown, with a drawer slide 12 provided on both sides of the movable furniture part 2. Furthermore, Fig. 2 A drive device 1. The drive device 1 is attached to the cabinet rail 14. This drive device 1 (or its support 3) extends in the closing direction SR of the movable furniture part 2. Especially with smaller or narrower drawers, it is sufficient if only one drive device 1 is assigned to the movable furniture part 2. This can be assigned (as shown) to the right-hand drawer slide 12, but also to the left-hand drawer slide 12.

[0035] For wider or larger drawers, it is advantageous – especially to prevent misalignment or jamming of the drawer in the furniture carcass 9 – to provide synchronized drive devices 1 and 1' on both sides of the movable furniture part. A suitable [device / component] is shown in Fig. 3 An arrangement 7 consisting of a (first) drive device 1 and a second drive device 1' is shown. These two drive devices 1 and 1' are connected to each other via a synchronizing rod 65. Specifically, sections of the opening and closing movements of the drive devices 1 and 1' are synchronized. The first drive device 1 is designed as a mirror image of the second drive device 1'. Otherwise, the drive devices 1 and 1' are identical.

[0036] Fig. 4 This is a perspective exploded view of a drive device 1. This drive device 1 has an elongated support 3. This support 3 is detachably connected to the loading rail 13. For example, snap connections or screw connections can be provided for this purpose. A heart-shaped guide track 52 for the locking pin 51 is formed in this support 3. The guide track 52 together with the locking element 53 and the locking pin 51 form the locking device 5 for the ejection device 4.

[0037] The ejection device 4 comprises the ejection slide 41, the control lever 43 which is movably (preferably rotatably) mounted on the ejection slide 41, and the ejection energy storage device 42. The ejection slide 41 is mounted linearly displaceable on the support 3. A pivot axis X 45 is formed in the ejection slide 41. The control lever 43 and its pivot axis counterpart 45 are rotatably mounted in or on this pivot axis X 45. The locking pin 51 is arranged on or formed on the control lever 43. The first energy storage base 46 is formed in the ejection slide 41. The second energy storage base 47 is formed on the support 3. The ejection energy storage device 42, in the form of a tension spring, is attached at one end to the first energy storage base 46 and at the other end to the second energy storage base 47. The pivot axis X 44 for the driver-catching lever 48 is formed on the ejection slide 41.This drive-lock lever 48 is rotatably mounted in the pivot axis X44 via the pivot-axis counterpart 44. The drive-lock lever 48 is guided by a guide element in the cam track 49 formed in the carrier 3.

[0038] The drive device 1 also includes a synchronizing device 6. This synchronizing device 6 comprises, on the one hand, a transmission element 60 that is linearly movable on the carrier. This transmission element 60, in turn, has a carrier body 64, a first transmission stop 61, a second transmission stop 62, and a synchronizing coupling element 63. The synchronizing coupling element 63 has teeth 67 spaced apart from each other in the closing direction SR. On the other hand, the synchronizing device 6 also includes a synchronizing coupling counter-element 66. This synchronizing coupling counter-element 66 is rotatably mounted on the carrier 3. The synchronizing coupling counter-element 66 has a gear with teeth 68. These teeth 68 mesh with the teeth 67. The synchronizing rod 65 can be attached in the receptacle 69 formed in the synchronizing coupling counter-element 66.

[0039] Out of Fig. 4 It is also evident that the synchronization coupling element 63, measured perpendicular to the closing direction SR, has a smaller maximum width B 63 than the maximum width B 64 of the carrier body 64 of the transmission element 60, measured perpendicular to the closing direction SR.

[0040] Out of Fig. 4 It also shows that the guide track 52 has a maximum guide track width B max measured perpendicular to the closing direction SR. This maximum guide track width B max is also shown again in the Fig. 5a und 5c shown. Viewed in the closing direction SR, the synchronization coupling element 63 and the ejection force storage unit 42 are arranged within this guide track width B max, as shown in Fig. 5a This is illustrated by the dotted lines. As a result, the drive device 1 is relatively narrow.

[0041] Fig. 5a Figure 1 shows a top view of the assembled drive device 1. The ejection energy storage unit 42 is held at the two energy storage bases 46 and 47. The driver 15 is caught between the driver catch lever 48 and the ejection slide 41. In the left area of Fig. 5a The side of the synchronizing coupling element 63 facing away from the teeth 67 is shown. The guide track 52 formed in the carrier 3 is visible. The synchronizing coupling element 63 is located behind the guide track 52 in the closing direction SR, while the ejection force storage unit 42 is located in front of the guide track 52 in the closing direction SR. The locking pin 51, guided in the guide track 52, is located in Fig. 5a at the very (right-hand) end of the guide track 52 in a bearing section L. This position of the drive device 1 according to Fig. 5a corresponds to a complete exposure of the OS of the movable furniture part 2.

[0042] This is appropriate in detail according to Fig. 5b It can be seen that the locking pin 51 formed on the control lever 43 is located in the bearing section L.

[0043] Fig. 5c shows a top view of part of the drive device 1 according to Fig. 5a , whereby the right-hand section and the ejection slide 41 are not shown. The locking pin 51 is located in the bearing section L of the guide track 52. The guide track 52 also has the closing section C, in which the locking pin 51 is movable during a closing movement of the movable furniture part 2. This is followed by the detent section E, in which the locking pin 51 is movable after leaving the closing section C. This is followed by the overpressure section U. The opening section O is connected to this, in which the locking pin 51 is movable when the movable furniture part 2 is opened or ejected. This opening section O finally transitions back into the bearing section L or into the closing section C. In the left-hand section of Fig. 5c In addition to the back of the synchronization coupling element 63, a tooth 68 of the synchronization coupling counter element 66 is also visible.

[0044] In Fig. 6a The movable furniture part 2 has moved in the closing direction SR, but is still in an open position OS. The closing movement moves the driver 15 associated with the movable furniture part 2 in the closing direction SR, thereby engaging the ejection carriage 41. This causes the ejection carriage 41 to move relative to the carrier 3, and the ejection force accumulator 42 is tensioned.

[0045] In detail according to Fig. 6b It can be seen that the locking pin 51 is no longer located in the bearing section L, but in the closing section C of the guide track 52.

[0046] According to Fig. 7a The movable furniture part 2, and with it the ejection carriage 41, has moved even further in the closing direction SR. However, the movable furniture part 2 is still in the open position OS. The ejection force storage unit 42 has been tensioned even further.

[0047] In detail according to Fig. 7b The locking pin 51 has moved so far in the locking section C that it abuts the second transmission stop 62 projecting into the guide track 52. Specifically, the transmission element 60 of the synchronizing device 6 has this second transmission stop 62 projecting into the locking section C of the guide track 52. The second transmission stop 62 is in stop position A.

[0048] In Fig. 7c The drive device 1 with the ejection slide 41 hidden is again visible.

[0049] According to Fig. 8a The movable furniture part 2 was moved further in the closing direction SR, but the closed position SS has not yet been reached. Therefore, the movable furniture part 2 is still in the open position OS. The ejection force storage unit 42 is almost fully compressed.

[0050] Because the locking pin 51 rests against the second transmission stop 62 in stop position A, the transmission element 60 is engaged during the closing movement (from Fig. 7a on Fig. 8a ) is movable via this second transmission stop 62 from the locking pin 51. The second transmission stop 62 is movable by the locking pin 51 from the stop position A to the (recessed) escape position W (see dashed line in Fig. 8b ), in which the second transmission stop 62 no longer projects into the guide track 52 and the locking pin 51 disengages from the second transmission stop 62. This movement of the second transmission stop 62 into the escape position W allows further movement of the locking pin 51 into the detent section E.

[0051] In Fig. 8c It is evident that (exclusively) the movement of the transmission element 60, triggered during the closing movement by the locking pin 51 via the second transmission stop 62, moves the locking element 53 (formed on the transmission element 60) into a detent-forming position, in which the locking element 53 forms the detent recess R of the guide track 52. Simultaneously with this movement of the transmission element 60, the synchronizing coupling element 63 is also moved, which in turn triggers a rotary movement of the synchronizing coupling counter-element 66. This rotary movement is transmitted via the synchronizing rod 65 to a second drive device 1'. Thus, this last movement segment of the closing movement is synchronized in the closing section C.

[0052] According to Fig. 9a The movable furniture part 2 was moved further in the closing direction SR, thus reaching the closed position SS. The ejection force storage unit 42 is fully compressed.

[0053] As in the Fig. 9b und 9c As can be seen, the locking pin 51 has even moved into the push-through protection channel D of the guide track 52. The transmission element 60 remains stationary during this (push-through) movement. This means that no synchronization or motion transmission to the second drive device 1' takes place.

[0054] If in this position according to the Fig. 10a bis 10c When the user stops pressing on the movable furniture part 2, the ejection force accumulator 42 can relax slightly, thereby moving the ejection slide 41 slightly in the opening direction OR, so that the locking pin 51 moves along the detent section E until the locking pin 51 engages in the detent recess R. This establishes the locking position VS of the locking device 5, as shown in the Fig. 5a, 5b und 5c The detent recess R is formed by the last part of the detent section E and by the holding surface H of the locking element 53. Even during this movement of the locking pin 51 in the detent section E, the transmission element 60 remains stationary. This means that no synchronization or motion transmission to the second drive device 1' takes place.

[0055] The Fig. 11a, 11b und 11c show the overpressure movement. If the SS is in the closed position according to the Fig. 10a bis 10c When the movable furniture part 2 is pressed in the closing direction SR, it enters the overpressure position ÜS. This overpressure movement of the movable furniture part 2 is transmitted by the driver 15 to the ejection slide 41 of the ejection device 4 and to the control lever 43 connected to the ejection slide, causing the locking pin 51 formed on the control lever 43 to release from the detent recess R, be deflected by the deflection ramp 54, and enter the overpressure section U (including the overpressure channel) of the guide track 52. This deflection causes the control lever 43 to pivot further counterclockwise. The locking position VS is released. The locking device 5 is unlocked. The transmission element 60 remains stationary even during this overpressure movement.

[0056] If in this overpressure position ÜS according to the Fig. 11a bis 11c When the user stops pressing on the movable furniture part 2, the ejection force accumulator 42 can release its pressure, as the locking pin 51 is no longer locked. This release causes the ejection carriage 41, and with it the locking pin 51, to move along the opening section O of the guide track 52. During this movement, the locking pin 51 first encounters the end face S formed on the locking element 51. Fig. 12b The locking pin 51 just meets this end face S. Fig. 12c The locking pin 51 has already moved the locking element 53 slightly in the opening direction OR via the end face S. The first transmission stop 61 is formed by this end face S, which is oriented transversely to the holding surface H and is formed on the locking element 53. This first transmission stop 61, which projects into the opening section O of the guide track 52, allows the transmission element 60 to move from the locking pin 51 during the opening movement. Thus, synchronization or transmission of this opening movement to the second drive device 1' takes place.If, despite the over-pressing of the movable furniture part 2, no unlocking has yet taken place in the second drive device 1' - for whatever reason, this synchronization moves the locking element 53 of the second drive device 1' in the opening direction OR, so that this locking element 53 no longer forms the detent recess R and the locking pin 51 of the second drive device 1' is unlocked.

[0057] In the Fig. 13a, 13b und 13c The ejection force storage unit 42 has relaxed a little further, so that the open position OS of the movable furniture part 2 has been reached. The locking pin 51 is still in contact with the end face S of the locking element 53, but is already deflected from this inclined end face S by the gap between the locking element 53 and the peninsula-shaped area 55 of the guide track 52. The movement of the transmission element 60 and thus the synchronization of the second drive device 1' is complete.

[0058] In the Fig. 14a, 14b und 14c The ejection force storage unit 42 has relaxed even further. The locking pin 51 has moved completely through the gap 56.

[0059] If, starting from this position according to the Fig. 14a bis 14c - in which the ejection movement by the ejection device 4 actually takes place - is mistakenly pressed in the closing direction SR onto the movable furniture part 2, the locking pin 51 cannot return to the overpressure section U or the detent recess R due to the design of the opening section O. For this reason, the guide track 52 has the Fig. 15 The free-running channel F shown is located within this channel. In this channel, the locking pin 51 can move without damage in the event of an accidental, premature closing movement.

[0060] In the Fig. 16a, 16b und 16c The ejection or opening movement is almost complete. The locking pin 51 is located in the last part of the opening section O. The ejection energy storage unit 42 is almost completely relaxed or discharged.

[0061] Finally, the movable furniture part 2 and the drive device 1 return to their positions according to the Fig. 5a bis 5cIf, in this position, a user continues to pull on the movable furniture part 2 in the opening direction OR, the drive lever 48 is rotated counterclockwise around the axis of rotation X 44 due to the curved design of the cam track 49. As a result, the drive 15 is no longer trapped between the ejector carriage 41 and the drive lever 48. The movable furniture part 2 can now move freely. The drive mechanism 1 remains stationary and is not affected by the movable furniture part 2. Reference symbol list:

[0062] 1 (First) drive device 1' Second drive device 2 Movable furniture part 3 Support 4 Ejection device 41 Ejection slide 42 Ejection energy storage 43 Control lever 44 Rotary axis counterpart 45 Rotary axis counterpart 46 First energy storage base 47 Second energy storage base 48 Carrier catch lever 49 Slide track 5 Locking device 51 Locking pin 52 Guide track 53 Locking element 54 Deflection ramp 55 Peninsula-shaped area 56 Gap 6 Synchronizing device 60 Transmission element 61 First transmission stop 62 Second transmission stop 63 Synchronizing coupling element 64 Support body 65 Synchronizing rod 66 Synchronizing coupling counterparts 67 Teeth 68 Teeth 69 Mount 7 Arrangement 8 Furniture 9 Furniture carcass 10 Drawer compartment 11 Front panel 12 Drawer extension guide 13 Drawer rail 14 Carcass rail 15 Drive unit 16 Pull-in device SS Closed position OS Open position ÜS Overpressure position VS Locking position R Recess H Holding surface O Opening section SS Front surface C Closing sectionA Stop position W Evasion position E Latching section U Overpressure section L Bearing section D Push-through protection channel F Freewheel channel SR Closing direction OR Opening direction B max Maximum guide track width B 63 Maximum width of the synchronization coupling element B 64 Maximum width of the carrier body X 44 Axis of rotation X 45 Axis of rotation

Claims

1. A drive device (1) for a moveable furniture part (2), in particular for a drawer, comprising - a carrier (3), - an ejection device (4) for ejecting the moveable furniture part (2) out of a closed position (SS) into an open position (OS), wherein the ejection device (4) is unlockable out of a locking position (VS) by an overpressing movement of the moveable furniture part (2) into an overpressing position (ÜS) behind the closed position (SS), - a locking device (5) for locking the ejection device (4) in the locking position (VS), wherein the locking device (5) has a locking pin (51) connected to the ejection device (4) and a guide track (52) provided at least partially in or on the carrier (3) for the locking pin (51), wherein the locking pin (51) in the locking position (VS) is locked in a latching recess (R) in the guide track (52), and - a synchronization device (6) moveable relative to the carrier (3) for synchronizing the movement of the drive device (1) with a second drive device (1'), wherein the synchronization device (6) has a transmission element (60) moveable by the locking pin (51), wherein the transmission element (6) is stationary at least in the overpressing movement, wherein the transmission element (60) has a second transmission abutment (62) projecting into a closing portion (C) of the guide track (52), wherein the second transmission abutment (62) is moveable by the locking pin (51) from an abutment position (A) into an evasion position (W) in which the locking pin (51) is released from the second transmission abutment (62), wherein the transmission element (60) is moveable in an opening movement by the locking pin (51), wherein the transmission element (60) has a first transmission abutment (61) projecting into an opening portion (O) of the guide track (52), wherein in the opening movement the transmission element (60) is moveable by the locking pin (51) by way of said first transmission abutment (61), and wherein the transmission element (60) is moveable in a closing movement by the locking pin (51), wherein the transmission element (60) is moveable by the locking pin (51) by way of the second transmission abutment (62) in the closing movement, and wherein the transmission element (60) is linearly moveably mounted to the carrier (3).

2. A drive device as set forth in claim 1 characterized in that arranged on the transmission element (60) is a locking element (53) for the locking pin (51), which also forms the guide track (52).

3. A drive device as set forth in claim 2 characterized in that the locking pin (51) is locked in the locking position (VS) in the latching recess (R) of the guide track (52), wherein the latching recess (R) is at least partially formed by the locking element (53) moveable relative to the carrier (3) and wherein the locking pin (51) is held in the locking position (VS) on the locking element (53), preferably at a holding surface (H) provided on the locking element (53).

4. A drive device as set forth in one of claims 1 to 3 characterized in that the first transmission abutment (61) is formed by an end face (S) which is provided on the locking element (53) and which is preferably oriented transversely relative to the holding surface (H).

5. A drive device as set forth in one of claims 1 to 4 characterized in that the locking element (53) is moveable into a latching recess-forming position in which the locking element (53) also forms the latching recess (R) of the guide track (52), preferably exclusively, by the movement of the transmission element (60) which is triggered in the closing movement by the locking pin (51) by way of the second transmission abutment (62).

6. A drive device as set forth in one of claims 1 to 5 characterized in that a further movement of the locking pin (51) is enabled into a latching portion (E) by movement of the second transmission abutment (62) into the evasion position (W).

7. A drive device as set forth in claim 6 characterized in that the transmission element (60) is stationary in a movement of the locking pin (51) in the latching portion (E) and in an overpressing portion (U).

8. A drive device as set forth in one of claims 1 to 7 characterized in that the synchronization device (6) has a synchronization coupling element (63) connected to the transmission element (60).

9. A drive device as set forth in one of claims 1 to 8 characterized in that the transmission element (60) has a carrier body (64), wherein the first transmission abutment (61), the second transmission abutment (62) and / or the synchronization coupling element (63) is / are formed in one piece with the carrier body (64).

10. An arrangement (7) comprising - a drive device (1) as set forth in one of claims 1 to 9, - a second drive device (1') as set forth in one of claims 1 through 9, and - a synchronization bar (65) for connecting the synchronization devices (6), in particular synchronization coupling counterpart elements (66), of the two drive devices (1, 1').

11. An article of furniture (8) comprising a furniture carcass (9), at least one furniture part (2) moveable relative to the furniture carcass (9) and a drive device (1) as set forth in one of claims 1 through 9 or an arrangement (7) as set forth in claim 10.

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