EP2983556B1 - Drawer slide rail with a drive device - Google Patents

Description

The invention relates to a pull-out for a drawer with 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 is. In addition, the invention relates to a piece of furniture with such a drive device. The invention further relates to a method for opening and closing a movable furniture part with a pull-out, 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 is from the earlier priority but not previously published Austrian patent application A 52/2012 (= AT 511 938 B1 ) a blocking element known to the movement in the overpressure position at too fast closing movement to prevent. A similar functional principle also goes from the GB 2 427 651 A out. 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.
In order to prevent triggering of the ejection device during pressing, a blocking element is provided, which has a blocking position in which the blocking element prevents the unlocking of the ejection device when reaching the overpressure position, and which has a release position in which the ejection device can be unlocked when the overpressing position is reached , By this blocking element is thus - in contrast to the patent application A 52/2012 - the movable furniture part when pressed not held in the closed position, but it is allowed to push up to the end stop or into 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.
For a mechanically simple switching between the blocking position and the release position, it is provided that the blocking element can be moved by a return device from the blocking position into the release position.
However, since it may well be desirable to unlock the movable furniture part with a strong push, it is provided that the return movement of the return 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.
Such a generic device is derived from the US 4,657,292 which also requires the time delay to be waived for every intentional overpressing movement. DE102006056791 discloses a generic pull-out for a drawer.

The object of the present invention is to provide an alternative possibility here.

This is achieved by a pull-out guide for a drawer with a drive device having the features of claim 1.
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. In principle, during this return movement of the blocking element from the blocking position into the release position, the movable furniture part can be located in the overpressure area between the closed position and the overpressing position. Preferably, the movable furniture part is on return of the blocking element in the release position but in the closed position. It is preferably provided 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 overpressure that in one Release position located locking element 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 designed for touch-latch mechanisms with a heart curve.

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. It is therefore particularly preferred that the drive device has a control track, wherein the ejection lever bears against the ejection section of the control track when the movable furniture part is ejected, when clamping the ejection force accumulator bears against a tensioning section of the control track and when retracting the movable track Furniture part in the closed position in the function as a retraction device abuts a retraction section of 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 pull-out guide according to the invention for a drawer with a drive device.

For a method for opening and closing a movable furniture part with a pull-out for a drawer with a drive device, the object of the invention is achieved with the recited in claim 14 steps. According to the invention, 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 by a reset device, preferably in a time between 0.2 and 4 seconds.

Fig. 1

ein Möbel mit einer Ausziehführung und einer Antriebsvorrichtung,

Fig. 2a

die Ausziehführung mit der Antriebsvorrichtung,

Fig. 2b

ein Detail von Figur 2a,

Fig. 3a bis 3c

die Antriebsvorrichtung in einer Schließstellung,

Fig. 4a und 4b

die Antriebsvorrichtung beim Überdrücken,

Fig. 5a bis 7

die Antriebsvorrichtung beim Ausstoßen,

Fig. 8

die Antriebsvorrichtung im Freilauf,

Fig. 9

die Antriebsvorrichtung beim Spannen,

Fig. 10

die Antriebsvorrichtung bei voll gespannten Kraftspeicher,

Fig. 11

die Antriebsvorrichtung beim Einziehen,

Fig. 12a bis 13c

die Antriebsvorrichtung bei Bewegen des Blockierelements in die Blockierstellung,

Fig. 14

die Antriebsvorrichtung bei Erreichen der Schließstellung,

Fig. 15a bis 15b

die Antriebsvorrichtung beim durch das Blockierelement verhinderten Entriegeln,

Fig. 16

ein Zeit-Weg-Diagramm der Bewegung des bewegbaren Möbelteils bei normalem Schließen und Auslösen,

Fig. 17

ein Zeit-Weg-Diagramm der Bewegung des bewegbaren Möbelteils beim Durchdrücken und

Fig. 18 bis 23b

ein alternatives Ausführungsbeispiel des Blockierelements.

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:

Fig. 1

a piece of furniture with a pull-out guide and a drive device,

Fig. 2a

the pull-out guide with the drive device,

Fig. 2b

a detail of FIG. 2a .

Fig. 3a to 3c

the drive device in a closed position,

Fig. 4a and 4b

the drive device when overpressing,

Fig. 5a to 7

the drive device when ejecting,

Fig. 8

the drive device freewheeling,

Fig. 9

the drive device during clamping,

Fig. 10

the drive device with fully tensioned energy storage,

Fig. 11

the drive device when pulling in,

Fig. 12a to 13c

the drive device when moving the blocking element in the blocking position,

Fig. 14

the drive device when reaching the closed position,

Fig. 15a to 15b

the drive device when unlocking prevented by the blocking element,

Fig. 16

a time-distance diagram of the movement of the movable furniture part during normal closing and release,

Fig. 17

a time-lapse diagram of moving the movable furniture part while pushing and

Fig. 18 to 23b

an alternative embodiment of the blocking element.

FIG. 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.

This is in FIG. 2a It can be seen 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.

In FIG. 2b it can be seen in detail that the ejection lever 7 rests on 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 element 21 in the release direction R is 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 damper 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 acting as Einziehkraftspeicher 11 ejection force memory 6. For moving the movable furniture part 2 in the opening direction OR pushes the movable furniture part 2 on the movable furniture part. 2 arranged ejection lever 7 on the furniture body 14 formed or arranged ejection stop 27 from.

In the FIGS. 3a to 3c various views of the drive device 1 are shown, this position of the drive device 1 corresponds 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 is in accordance with the FIGS. 3a to 3c located 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 pressed in the closing direction SR on the movable furniture part 2, the movable furniture part 2 passes into the overpressure ÜS, in which case the drive device 1 in the position according to the FIGS. 4a and 4b located. 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 overpressure position ÜS the discharge roller 20 does not move further in the closing direction SR, but it is triggered pivoting of the ejection lever 7 about the pivot axis X. By this pivoting remains the Although ejection roller 20 seen in the closing direction SR in the same position, 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 in the position according to the FIGS. 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 is according to the FIGS. 5a to 5c in an open position OS. The locking element 9 is still in the release position G.

Due to the fact that the ejection force accumulator 6 continues to relax, the drive device 1 continues to move into the positions according to FIG FIGS. 6 and 7 ,

Due to the momentum of the ejection device 3 or by manual pulling on the movable furniture part 2 in the opening direction OR, the drive device continues to move into the position according to FIG FIG. 8 , In this position, the movable furniture part 2 is in a freewheel. When the movable furniture part 2 of FIG. 8 is further moved in the opening direction OR, the flap 23 allows pivoting clockwise passing the ejection roller 20th

When the movable furniture part 2 is then moved again in the closing direction SR, the ejection roller 20 comes into abutment with the clamping section S formed on the flap 23 and on the control element 21 (see FIG FIG. 9 ). Once the ejection roller 20, the control 21 and the flap 23 contacted, the entire control against the force of the power accumulator, not shown, moves against 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 according to FIG. 10 in which the ejection energy storage 6 is fully tensioned. 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 according to FIG. 10 in the closing direction SR, the ejection lever 20 comes in the Einziehabschnitt E according to FIG. 11 , wherein the ejection lever 7 now acts as a retraction device 35 in cooperation with the Einziehkraftspeicher 11. 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.

As a result, the discharge roller 20 comes in contact with the rotary lever 30 of the blocking member 4, as shown in the FIGS. 12a to 12c is shown. 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 turning, 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 the FIGS. 12a to 12c Thus, the blocking element 4 is already in the blocking position B.

By relaxing the Einziehakraftspeichers 11, the drive device 1 passes further into the position according to the FIGS. 13a to 13c in which the movable furniture part 2 is still in an open position OS. During this retraction movement, the effect of the damping device 19 also sets in and counteracts the spring force of the retraction force accumulator 11. According to the FIGS. 13a to 13c the blocking element 4 has rotated further in a clockwise direction, so that the blocking cam 31 at the end of the guideway 10 arrives. In this position, the return 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 come to the position shown in FIG 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 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 ejector 3 can not be unlocked, which is described by the following FIGS. 15a to 15b is illustrated:

Especially by comparing with FIG. 4a is in FIG. 15a namely recognizable that the ejection lever 7 has again rotated about the pivot axis X in the clockwise direction due to the movement of the movable furniture part 2 in 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, this movement in the release direction R is according to FIG. 15b thereby preventing the blocking cam 31 of the blocking element 4 from abutting the blocking flank 33 of the guide track 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 the movable furniture part 2 is pressed into the overpressure position ÜS, as long as the blocking element 4 is in the blocking position B, no release of the ejection device 3 can take place. As long as continued by an operator in the closing direction SR pressure on in the Excess push position ÜS located drawer (movable furniture part 2) is exercised, the blocking element 4 can not be moved by the return device 5 in the release position 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. is. By this offset, the rotational axis of the pivot bearing 32 is no longer consistent with the formation of the guideway 10 and the blocking cam 31 can not move along the guideway 10 counterclockwise, but wedged on the blocking edge 33 (see FIG. 15b ). 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 bit again and pivot the ejection lever 7 counterclockwise, so that on the ejection roller 20, the locking element 9 again in the position according to FIG. 14 arrives. In this position according to FIG. 14 If the rotational axis of the pivot bearing 32 again coincides with the radius of the guide track 10, so that the restoring device 5, the blocking element 4 counterclockwise delayed in the in Figure 3c shown release position F can move. In this Figure 3c the blocking cam 31 has overcome the blocking edge 33 and the blocking element 4 can be moved along the straight portion 36 of the guideway 10 with the control element 21 and the locking element 9 in the release direction R when the movable furniture part 2 is pressed into the overpressure position ÜS, so that, as in FIG FIG. 4b shown, the ejection section A is released for the discharge roller 20.

In FIG. 16 is the position of the movable furniture part 2 during a closing operation without pushing through schematically shown in a time-way diagram. At the beginning of the closing movement, therefore, the blocking element 4 is 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 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 B 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 externally on the movable furniture part 2, according to the invention begins at the latest by reaching the closed position SS, the return movement T. With the end of this return movement T and the blocking element 4 again passes from the blocking position B in the release position F. Subsequently, as indicated by the dotted representation, any waited for the unlocking. 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 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 release section L). As soon as the movable furniture part 2 is in this closed position SS, the invention also starts again Return movement T by the return device 5. After the same period as in FIG. 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 in FIG. 16 as long as you wait for the triggering or unlocking. 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.

In the Fig. 18 to 23b is shown a further embodiment of the present invention, in which especially the blocking element 4 is formed differently. First of all, let's start with that Fig. 18 directed. These Fig. 18 corresponds to the position of the drive device 1 according to Fig. 9 , That is, the movable furniture part 2 is being closed and the discharge roller 20 abuts against the tensioning portion S of the control member 21. As a result, the entire control 21 was like Fig. 8 on Fig. 9 emotional. 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 moves in accordance with FIG Fig. 18 the deflector edge 38 contacted. In this Fig. 18 is the movable furniture part 2 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.

If according to Fig. 19 the control element 21 is moved during clamping, the blocking cam 31 is rejected by the deflector edge 38, whereby the blocking element 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, the blocking element 4 is in the blocking position.

According to Figs. 20a and 20b over 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.

Is carried out directly by pushing the movable furniture part 2 in an overpressure ÜS, as in Figs. 21a and 21b Although the discharge roller 20 lifts off the locking element 9, only a brief movement of the entire control element 21 takes place since this movement is stopped immediately by the contact 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 according to FIG Figs. 22a and 22b arrives. 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 starting from this position, a "normal" or desired overpressing takes place, unlocking and ejection, as already to the Fig. 3 to 4 described. In this case, the discharge roller 20 comes as in Figs. 23a and 23b shown in the ejection section A, since it has been released from the control 20. During this movement of the control element 21 to the right, the blocking cam 31 also moves along the guideway 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. In principle, however, the reversal variant is also conceivable, according to which an ejection lever 14 assigned to the furniture body 14 ejects the movable furniture part 2. The individual components can all, be partially or not attached to the pull-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.

Claims (15)

1. An extension guide means for a drawer comprising a drive device (1) for a moveable furniture part (2) comprising a lockable ejection device (3) for ejecting the moveable furniture part (2) from a closed position (SS) into an open position (OS), wherein the ejection device (3) can be unlocked by over-pressing the moveable furniture part (2) into an over-pressing position (ÜS) which is behind the closed position (SS) in the closing direction (SR), comprising a blocking element (4)

   - which has a blocking position (B) in which the blocking element (4) prevents unlocking of the ejection device (3) when the over-pressing position (ÜS) is reached, and

   - which has a release position (F) in which the ejection device (3) can be unlocked when the over-pressing position (ÜS) is reached,

   wherein the blocking element (4) is moveable from the blocking position (B) into the release position (F) by a resetting device (5) and the resetting movement (T) of the resetting device (5) is effected in time-delayed relationship, characterised in that the resetting movement (T) begins at the latest when the closed position (SS) is reached.
2. The extension guide means for a drawer as set forth in claim 1 characterised in that the blocking element (4) is moveable into the blocking position (B) before the closed position (SS) is reached.
3. The extension guide means for a drawer as set forth in claim 2 characterised in that the blocking element (4) is moveable from the blocking position (B) into the release position (F), wherein the moveable furniture part (2) is in the closed position (SS) when the blocking element (4) returns into the release position (F).
4. The extension guide means for a drawer as set forth in one of claims 1 through 3 characterised in that the resetting movement (T) lasts between 0.2 second and 4 seconds, preferably between 0.3 second and 1 second.
5. The extension guide means for a drawer as set forth in one of claims 1 through 4 characterised by an ejection lever (7) which is force-actuated by an ejection force storage means (6), and a locking element (9) which is moveable along a locking base plate (8) and against which the ejection lever (7) bears in the closed position (SS), wherein in the closed position (SS) the locking element (9) which is in a locking position (V) blocks the path of movement of the ejection lever (7) into an ejection portion (A) and in the over-pressing position (ÜS) the locking element (9) which is in a release position (G) enables the path of movement of the ejection lever (7) into the ejection portion (A).
6. The extension guide means for a drawer as set forth in claim 5 characterised in that the blocking element (4) is mounted moveably, preferably rotatably, on the locking element (9).
7. The extension guide means for a drawer as set forth in claim 5 or claim 6 characterised in that the blocking element (4) is moveable into the blocking position (B) in a closing movement by the ejection device (3), preferably by the ejection lever (7) thereof.
8. The extension guide means for a drawer as set forth in one of claims 5 through 7 characterised in that the blocking element (4) which is in the blocking position (B) prevents the movement of the locking element (9) into the release position (F).
9. The extension guide means for a drawer as set forth in one of claims 5 through 8 characterised in that the blocking element (4) is mounted limitedly moveably in a guide path (10) preferably provided in the blocking base plate (8).
10. The extension guide means for a drawer as set forth in claim 9 characterised in that the blocking element (4) is held, preferably wedged, in its blocking position (B) in the guide path (10).
11. The extension guide means for a drawer as set forth in one of claims 1 through 10 characterised by a retraction device (35) preferably formed by the ejection lever (7).
12. The extension guide means for a drawer as set forth in claim 11 characterised in that the drive device (1) has a control path (12), wherein the ejection lever (7) bears against the ejection portion (A) of the control path (12) upon ejection of the moveable furniture part (2), it bears against a stressing portion (S) of the control path (12) upon stressing of the ejection force storage means (6) and it bears against a retraction portion (E) of the control path (12) upon retraction of the moveable furniture part (2) into the closed position (SS) in the functioning as a retraction device (35).
13. An article of furniture (13) having an extension guide means as set forth in one of claims 1 through 12.
14. A method of opening and closing a moveable furniture part (2) with an extension guide means, in particular as set forth in one of claims 1 through 12, comprising the following step for opening the moveable furniture part (2):

    - ejection of the moveable furniture part (2) from a closed position (SS) into an open position (OS) by a lockable ejection device (3), wherein the ejection device (3) is unlocked by over-pressing of the moveable furniture part (2) into an over-pressing position (ÜS) which is behind the closed position (SS) in the closing direction (SR),

    with the steps:

    - movement of a blocking element (4) of the drive device (1) upon closing of the moveable furniture part (2) into a blocking position (B) in which unlocking of the ejection device (3) is prevented upon reaching the over-pressing position (ÜS), and

    - movement of the blocking element (4) by a resetting device (5) from the blocking position (B) into a release position (F) in which unlocking of the ejection device (3) occurs upon reaching the over-pressing position (ÜS), wherein the resetting movement (T) of the resetting device (5) is effected in time-delayed relationship,

    characterised in that the resetting movement (T) begins at the latest when the closed position (SS) is reached.
15. A method as set forth in claim 14 characterised in that the movement of the blocking element (4) from the blocking position (B) into the release position (F) is effected with the moveable furniture part (2) in the closed position (SS) in time-delayed relationship by a resetting device (5), preferably in a time of between 0.2 and 4 seconds.

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