EP2428136B1 - Drawer slide - Google Patents

Description

The invention relates to a pull-out for extending a movable furniture part of a furniture body, comprising a carcass rail for attachment to the furniture body, a relative to the carcass rail displaceably guided center rail, on the one above the other a differential role, which has a game in the vertical direction and on a track of the Carcass rail unrolls, and a support roller are rotatably mounted, and a relative to the carcass rail guided Ausziehschiene for attachment to the pull-out furniture part, which has a catwalk, which runs when pulling the puller to a first Ausziehposition through the gap between the differential role and the support roller and which, upon further extension of the pull-out rail, extends out of the gap between the differential roller and the support roller.

Differential extenders in which a synchronous or Differentialiall the center rail is reached when pulling out the pull-out, go for example from the AT 391603 B . AT 505053 B1 and EP 2074909 A1 out. In a central region of the center rail, a differential roller is rotatably mounted, which runs on a track of a catwalk of the pull-out rail and a track of a guide web of the carcass rail. The differential role is in this case load-transmitting, ie a part of the weight of the pull-out rail and the parts carried by it is derived via the differential role on the carcass rail. Above the differential roller is a support roller. This serves to support the catwalk of the pull-out against pivoting upwards, especially in the extended state of the pull-out rail. The catwalk of the pull-out rail thus runs when pulling out the pull-out through a gap between the differential roller and the support roller. To the differential role reliably both with the track of the carcass rail and with the runway of the catwalk of the pull-out in engagement to hold, the differential role is usually stored with a present at least in the vertical direction game against the center rail.

At the time of the AT 505053 B1 As a result, the differential pull-out guide is equipped with an automatic retraction mechanism (= self-closing mechanism) to automatically retract the pull-out rail when inserted over the last section of its stroke.

In order to provide an over-extension in which the pull-out of the pull-out rail is greater than the length of the carcass rail, an additional support roller is rotatably mounted on the center rail in the area in front of the support roller (= further lying at the pull-out end of the center rail as the support roller). When the catwalk of the pull-out rail extends out of the gap between the differential roller and the support roller, which is required to reach the over-extension, the additional support roller supports the catwalk of the pull-out against pivoting upwards. Below the additional supporting role usually an auxiliary support member is arranged, which is usually designed as a sliding member to support the catwalk of the pull-out rail against pivoting down in the case of a very far back weight distribution of the extendable furniture part. Such differential pull-outs with over extension are known.

In addition to roller pull-out guides, in which all the rollers enabling the mutual displacement of the rails are rotatably mounted about (at least substantially) axes which are stationary relative to the rails, pullout guides are also known, which have carriages fitted with balls or rollers.

In the role differential extension guides usually all rollers are rotatably mounted on the center rail.

In the role-pull guides are known as another type telescopic extension guides in which on all rails load-transmitting rollers are rotatably mounted and in which the pull-out and the center rail are pulled out of the carcass rail successively. It comes at the end of Ausziehweges the Pull-out from the center rail to a start of a stop element of the pull-out on a stop element of the center rail and an associated shock, whereby the running culture is impaired. Excerpts have therefore already been developed according to the telescopic design, in which additional measures are provided to achieve a simultaneous extension of the rails, as is the case with separations of the differential type. For example, this can be provided on the middle rail a window recess of the middle rail passing through elastic drive roller which runs on tracks of the pull-out and the carcass rail, but does not represent a load-transmitting role. Such a telescopic extension with differential effect, for example, from the AT 392883 B out.

Although the described Differentialausziehführungen have proven effective with over extension, it comes with these pull-out by the extension of the catwalk from the gap between the differential role and the support roller to a deterioration of the running culture. It comes here when pulling out to a certain lowering of the pull-out and when retracting to appropriate increase. The extension of the catwalk of the pull-out rail from the gap between the differential roller and the support roller when pulling out and threading into this gap when retracting is hereby noticeable and possibly also audible. Also occurs at the moment of retraction of the catwalk of the pull-out in this gap to a force acting on the center rail in the longitudinal direction of the center rail force, whereby the synchronous operation of the center rail can be impaired.

The object of the invention is to provide a pull-out guide of the type mentioned with an improved running culture. According to the invention, this is achieved by a pull-out guide with the features of claim 1.

In the pull-out guide according to the invention, a tongue is displaceably mounted on the middle rail between a passive end position and an active end position. For this tongue, a displacement device is provided, the extension of the pull the tongue from its passive end position, in which the Tongue is outside the gap lying between the differential roller and the support roller, moves into the active end position in which the tongue is inserted into this gap. The insertion of the tongue in the present between the differential role and the support roller gap here is at the latest when the catwalk is extended from this gap. As long as the runway of the pull-out rail passes through the gap between the differential roller and the support roller, the center rail is displaced synchronously or differentially to the pull-out rail (at half the speed or half the distances with which the pull-out rail is displaced). If the catwalk of the pull-out rail extends out of the gap between the differential roller and the support roller, there is no further displacement of the center rail. Preferably, when pulling the pull-out rail before the catwalk of the pull-out rail extends out of the gap between the differential roller and the support roller, the tongue is inserted into this gap, with the catwalk in the overlap area, in which both the catwalk and the tongue are in the gap and the tongue each extend over a portion of the width of the gap.

By retracting the tongue in the present between the differential roller and the support roller gap when the catwalk of the pull-out is extended from this gap, a reduction in the width of this gap due to the vertical clearance of the differential role is at least largely prevented. This improves the running properties. The transition between the state in which the catwalk runs between the differential roller and the support roller, and the state of the catwalk pulled out of the gap between the differential roller and the support roller is ideally no longer, but at least less noticeable. The synchronous movement of the center rail is thus more reliable when inserting the pull-out. The lowering of the pull-out rail and the extendable furniture part carried by it in the last section of the extraction is at least reduced.

The displacement device is driven by the mutual movement of the rails when pulling out the pull-out guide. In an advantageous embodiment According to the invention, the displacement device is driven by the movement of the middle rail relative to the carcass rail when the pull-out guide is pulled out. Preferably, in this case, a drive part of the displacement device is slidably disposed on the middle rail, which has a stop which extends when pulling the pull-out rail before reaching the pull-out of the pull-out, in which the catwalk of the pull-out rail from the gap between the differential roller and the support roller, to a counter-stop the carcass rail starts and keeps the drive part stationary with respect to the carcass rail on further extension of the pull-out rail. Thus, as long as the center rail moves (until reaching the pull-out position where the catwalk of the pull-out rail extends out of the gap between the differential roller and the support roller), the drive member is displaced from the center rail, thereby driving the shuttle. This moves the tongue from its passive end position to its active end position. Conceivable and possible would be the arrangement of the counter-attack on the pull-out, but the movement of the drive member is longer, since the pull-out moves to the end of Ausziehweges (a decoupling of the tongue from the movement of the drive member at a desired position of the pull-out Extending rail can be provided). If this is not desired, could be done after a certain displacement distance of the drive part and a decoupling of the counter-attack, for example, in the way this is known from tilting slides of automatic feed (= Selbsteinzügen) ago.

In other possible embodiments, the drive part could also be arranged on the pull-out rail or on the carcass rail, wherein it interacts with a part of the displacement device arranged on the middle rail when it is moved past it when the pull-out device is pulled out in order to move the tongue by means of the displacement device move from their passive to their active end position. For example, the drive part could be a toothed rack, from which a toothed wheel of the displacement device arranged on the center rail is driven.

A preferred embodiment of the invention provides that the displacement device has a drive gear which meshes with a toothing of the tongue or a part connected thereto, wherein the rotation of the drive gear, the tongue is moved from its passive to its active end position. With the drive gear or with a gear, which drives the drive gear directly or via at least one further gear member, such as another gear or a belt, meshes a toothing of the drive member. By the displacement of the drive member relative to the drive gear or the other gear, with which it meshes, thereby the tongue can be moved from its passive to its active end position.

The tongue is advantageously guided in the region of its insertable in the present between the differential roller and the support roller gap end of a slotted guide relative to the center rail. This slotted guide comprises an advantageously arranged in the middle rail link opening and an advantageously arranged on the tongue pin, which engages in the gate opening. Through this slotted guide, the insertable into the gap between the differential role and the support roller end of the tongue can be moved in the displacement of the tongue of their passive in their active end position both in the longitudinal direction of the center rail (= in the direction of withdrawal) and in height. In this way, the tongue can release in its passive end position and the displacement of the catwalk of the pull-out.

In order to shift the tongue when inserting the pull-back guide from its active end position into its passive end position, it is preferably provided that the catwalk of the pull-out rail enters the gap present between the differential roller and the support roller and in this case approaches the tongue on the front side. This frontal approach to the tongue thus takes place from the first pull-out position of the pull-out rail. Upon further insertion of the pull-out rail, the pull-out rail pushes the tongue out of the gap and into its passive end position.

Instead, it would also be conceivable and possible that a stop of the pull-out rail starts against a counter-stop connected to the tongue and thereby shifts the tongue from its active end position into its passive end position when the pull-out rail is inserted. Also, this could be a stop of the displaceable relative to the center rail mounted drive member cooperate with a counter-stop of the pull-out rail or the carcass rail. If the drive part is arranged on the pull-out rail or on the carcass rail (for example formed by a rack arranged on the pull-out rail or on the carcass rail), the displacement of the tongue from its active to its passive end position could also be effected by the displacement of the drive part with respect to the center rail become.

Conveniently, an additional support roller is rotatably mounted on the middle rail in the region of the longitudinal extension of the middle rail, which is located between the support roller and the front end of the center rail. This acts when the catwalk of the pull-out rail is extended out of the gap between the differential roller and the support roller, with the track at the top of the catwalk of the pull-out together.

Preferably, the pull-out guide of the present invention is formed in a form of a roll pull-out guide, i. all rollers for mutually displaceable guidance of the rails are rotatably mounted on at least one of the rails. It is particularly preferred that all provided for mutually displaceable guidance of the rails rollers are rotatably mounted on the center rail.

Conveniently, the support roller is rotatably mounted above the differential roller in a central region of the center rail.

Advantageously, on the center rail in the region of its front end a front roller, which cooperates with a track on the underside of the catwalk of the pull-out, and in the region of its rear end, a rear roller rotatably mounted, which cooperates with a raceway on the underside of a guide web of the carcass rail, as is known and customary.

If in the context of this document from "front" and "back" is mentioned, this is based on the pull-out of the pull-out rail from the carcass rail. The terms "top", "bottom", "vertical" and "horizontal" refer to the usual operating position of the pull-out guide, in which the pull-out direction is horizontal.

• Fig. 1 eine Seitenansicht eines Ausführungsbeispiels einer erfindungsgemäßen Ausziehführung im eingefahrenen Zustand;
• Fig. 2 die Ausziehführung von Fig. 1 im eingefahrenen Zustand in Schrägsicht;
• Fig. 3 eine Schrägsicht der Ausziehführung in der Stellung beim Ausfahren, in welcher die Verschiebung der Zunge beginnt, die Mittelschiene und die Verschiebevorrichtung teilweise aufgeschnitten;
• Fig. 4 einen vergrößerten Ausschnitt von Fig. 3;
• Fig. 5 die Ausziehführung in der Stellung von Fig. 3 aus einem anderen Blickwinkel,
• die Korpusschiene teilweise aufgeschnitten;
• Fig. 6 einen vergrößerten Ausschnitt von Fig. 5;
• Fig. 7 eine Schrägsicht der Ausziehführung von Fig. 1 in der Stellung, in welcher der Laufsteg der Ausziehschiene aus dem Spalt zwischen der Differentialrolle und der Stützrolle ausfährt;
• Fig. 8 einen vergrößerten Ausschnitt von Fig. 7;
• Fig. 9 einen vergrößerten Ausschnitt entsprechend Fig. 8, die Mittelschiene und die Verschiebevorrichtung teilweise aufgeschnitten;
• Fig. 10 eine Schrägsicht der Ausziehführung in einer Stellung entsprechend Fig. 7 aus einer anderen Blickrichtung, die Korpusschiene teilweise aufgeschnitten;
• Fig. 11 einen vergrößerten Ausschnitt von Fig. 10;
• Fig. 12 die Ausziehführung im vollständig ausgezogenen Zustand, die Mittelschiene und die Verschiebevorrichtung teilweise aufgeschnitten;
• Fig. 13 einen vergrößerten Ausschnitt von Fig. 12;
• Fig. 14 eine Seitenansicht im vollständig ausgezogenen Zustand;
• Fig. 15 bis 17 Schrägsichten der Korpusschiene, der Mittelschiene (mit angebrachter Distanzhalteeinheit) und der Ausziehschiene;
• Fig. 18, 19 und 20 Schrägsichten der Korpusschiene, der Mittelschiene (mit angebrachter Distanzhalteeinheit) und der Ausziehschiene aus einer anderen Blickrichtung;
• Fig. 21 ein vergrößertes Detail A von Fig. 20;
• Fig. 22 und 23 Schrägsichten der Distanzhalteeinheit aus verschiedenen Blickrichtungen.

Further advantages and details of the invention are explained below with reference to the accompanying drawings. In this show:

• Fig. 1 a side view of an embodiment of a pull-out according to the invention in the retracted state;
• Fig. 2 the pull-out guide of Fig. 1 when retracted in oblique view;
• Fig. 3 an oblique view of the pull-out in the position of extension, in which the displacement of the tongue begins, the middle rail and the displacement device partially cut open;
• Fig. 4 an enlarged section of Fig. 3 ;
• Fig. 5 the pull-out guide in the position of Fig. 3 from a different angle,
• the carcass rail partially cut open;
• Fig. 6 an enlarged section of Fig. 5 ;
• Fig. 7 an oblique view of the pull-out of Fig. 1 in the position in which the catwalk of the pull-out rail extends out of the gap between the differential roller and the support roller;
• Fig. 8 an enlarged section of Fig. 7 ;
• Fig. 9 an enlarged section accordingly Fig. 8 , the middle rail and the displacement device partially cut open;
• Fig. 10 an oblique view of the pull-out in a position accordingly Fig. 7 from another perspective, the carcase rail partially cut open;
• Fig. 11 an enlarged section of Fig. 10 ;
• Fig. 12 the pull-out guide in the fully extended state, the middle rail and the displacement device partially cut open;
• Fig. 13 an enlarged section of Fig. 12 ;
• Fig. 14 a side view in the fully extended state;
• 15 to 17 Oblique views of the carcass rail, the center rail (with attached spacer unit) and the pull-out rail;
• Fig. 18, 19 and 20 Oblique views of the carcass rail, the center rail (with attached spacer unit) and the pull-out rail from another viewing direction;
• Fig. 21 an enlarged detail A of Fig. 20 ;
• FIGS. 22 and 23 Oblique views of the distance holding unit from different directions.

An embodiment of a pull-out according to the invention is in the Fig. 1 to 23 shown. The pull-out guide is used to pull out a pull-out furniture part, in particular a drawer, from a furniture body (not shown in the figures), wherein on both sides of the pull-out furniture part mirror-shaped pull-out guides of the type shown are attached. The pull-out guide comprises a body rail 1 to be fastened to the furniture body, a pull-out rail 3 to be fastened to the pull-out furniture part, and a middle rail 2 lying therebetween.

The carcass rail 1 has a vertical base web 4, with which it rests in the fastened state on the furniture body, and connected to the base web 4 at its upper and lower edge upper and lower horizontal guide webs 5, 6. These can be connected to the base web 4, for example via bends be, as is the case in the illustrated embodiment for the upper guide web 5. Preferably, the guide webs 5, 6 are provided at their free edges with towards each other Umbördelungen 7, 8.

The pull-out rail 3 has a vertical base bar 9, a horizontal walkway 10 connected to the upper edge of the base bar 9, and a side bar 11 extending downwardly from the catwalk 10 at its edge remote from the vertical base bar 9 of the pull-out bar 3. The side bar 11 is shorter than the vertical base web 9 and thus extends less far down. The catwalk 10 may be connected to the base web 9 as shown via a bend.

Instead, for example, from the bottom of the vertical base web and a lower horizontal web could go out (in the opposite direction as the catwalk 10) on which rests the extendable furniture part.

The pull-out guide is designed as a roller pull-out guide and the rollers for mutually displaceable guidance of the rails 1, 2, 3 are rotatably mounted on the middle rail 2. Here are at the middle rail 2 in the region of its front end 12, a front roller 14, in the region of its rear end 13, a rear roller 15 and rotatably mounted in its central region a differential roller 17 and a differential roller 17 above the support roller 16. The differential roller 17 and the support roller 16 include a gap s with each other (see. Fig. 16 ).

The front roller 14 cooperates with a track at the bottom of the catwalk 10 of the pull-3 and supports the pull-3 in the extended state of the rails against tipping down from.

The rear roller 15 cooperates with a track at the bottom of the upper guide bar 5 of the carcass rail 1 and supports the rear end 13 of the center rail 2 in the extended state of the pull-out against pivoting upwards.

The support roller 16 cooperates with a track at the top of the catwalk 10 of the pull-3 and can in the partially extended state of the rails (in front of the catwalk 10 from the gap between the differential roller 17 and the support roller 16 extends) form an abutment for the pull-3 (against upward pivoting of the pull-out).

The differential roller 17 cooperates both with an upward trajectory on the upper side of the lower guide web 6 of the body rail 1 and with the downward career on the underside of the catwalk 10 of the pull-out 3 together (before the catwalk of the pull-out of the gap between the Differential roller 17 and the support roller 16 extends) and causes the differential or synchronous running of the center rail 2, when the pull-3 is pulled out. The middle rail is in this case when pulling the pull-3 in the extension direction 35 (wherein the middle rail 2 with its longitudinal extent is parallel to the withdrawal direction 35) and moves during insertion of the pull-out against the pull-35 each halfway, the pull-out rail 3 travels. From the differential roller 17, a load is transferred from the pull-out rail 3 directly to the carcass rail 1. The differential roller 17 is mounted with play relative to its axis of rotation, as is known and customary. This results in a game (= a displacement) of the differential roller 17 (also) in the vertical direction. In this way, tolerances can be recorded and a sufficient pressure force of the differential roller 17 on the raceways of the catwalk 10 and the guide bar 6 is achieved. Also, an axleless support of the differential roller 17 on the middle rail 2 with play or a bearing on an axis which has a clearance in the vertical direction relative to the center rail 2, is conceivable and possible.

Preferably, on the center rail 2, an auxiliary roller 18 is supported with play relative to its axis of rotation, in a lying between the differential roller 17 and the rear end 13 of the middle rail 2 region of the longitudinal extent of the center rail 2. This auxiliary roller 18 can with the career at the Underside of the catwalk 10 of the pull-3 and the track at the top of the lower guide bar 6 of the carcass rail 1 cooperate and serves to support against tipping down the rear end 19 of the pull-3 in the retracted or slightly extended state of the pull-out. Instead of the auxiliary roller 18 could in principle also be provided a slider. In principle, other auxiliary rollers 18 or slider could be provided. For example, two smaller auxiliary rollers could be provided, one of which cooperates with the downwardly oriented track of the catwalk 10 and the other with the upwardly directed track of the lower guide web 6. In principle, it would also be feasible and conceivable, instead of the illustrated auxiliary roller 18, to support at least one auxiliary roller in the area between the middle roller 16 and the front roller 14 on the middle rail 2, which interacts with the track at the top of the catwalk 10 of the pull-out rail 3 ,

To enable an over extension, an additional support roller 19 is rotatably mounted on the center rail 2, in a lying between the differential roller 17 and the front end 12 of the middle rail portion of the longitudinal extent of the center rail 2. The additional support roller 19 acts with the track at the top of the Catwalk 10 of the pull-out rail 3 together and forms an abutment for the pull-3 in the region of the over-pull (against a pivoting of the pull-3 upwards).

Further, in the area between the differential roller 17 and the front end 12 of the center rail 2 on the center rail 2, an auxiliary support member 20 is arranged. This can cooperate in the region of the over-extension with the raceway on the underside of the catwalk 10 of the pull-out rail 3 to support the rear end of the pull-3 against pivoting of the pull-down rail 3 down (at a very far back lying load distribution of the pull-3 extendable furniture part). The auxiliary support member 20 is formed in the embodiment shown as a slider, but could also be designed as a role.

In the exemplary embodiment shown, the middle rail 2 has two offsets, resulting in an upper vertical section 21, a middle vertical section 22 and a lower vertical section 23, of which the upper and lower vertical sections 21, 23 are vertically above one another and the middle one vertical section 22 is laterally offset. The rear roller 15, the support roller 16 and the additional support roller 19 are rotatably mounted on the upper vertical portion 21. The front roller 14, the differential roller 17, the auxiliary roller 18 and the auxiliary support member 20 are rotatably supported at the lower vertical portion 23.

Stops 24, 25 are in a conventional manner for the assembly and disassembly of the rails 1 - 3 adjustable.

The center rail 2 could also have another known from roller differential extension guides ago training, for example, a training with a continuous vertical base web, projecting from the upper and lower edge horizontal guide webs, as is apparent from the mentioned in the introduction of the prior art.

On the center rail 2, a spacer unit is mounted in a region of the longitudinal extent of the center rail 2, which is behind the differential roller 17 and support roller 16, in the FIGS. 22 and 23 is shown alone. This distance holding unit comprises a tongue 26, which is displaceably mounted by a mounted on the middle rail 2 bearing member 27. The tongue 26 is thus slidably mounted in the attached to the middle rail 2 state of the bearing part 27 relative to the central rail 2. The tongue 26 is provided with a toothing 28 over part of its longitudinal extent. At this toothed region includes an untoothed portion 29, which serves for insertion into the gap between the differential roller 17 and the support roller 16, as will be described in more detail below. The section 29 connects to the end 30 of the tongue 26, which in the mounted state of the spacer unit front (relative to the pull-35) lies. The toothing 28 of the tongue 26 meshes with a drive gear 31, which is rotatably mounted on the bearing part 27. The drive gear 31 meshes further with a toothing 33 of a drive member 32. The drive member 32 is slidably supported by the bearing member 27, so that the drive member 32 is mounted in the middle rail 2 mounted state of the bearing member 27 relative to the center rail 2 in the longitudinal direction. The drive part 32 has a stop 34 in the region of its rear end.

The tongue 26 is flexible and guided in the region of its front end 30 by a slotted guide relative to the center rail 2. This slide guide comprises a sliding recess in the middle vertical section 22 of the middle rail 2 and a pin 37 which is mounted in the region of the front end 30 on the tongue 26 and projects into the sliding recess 36. In the displacement of the tongue 26 relative to the bearing member 27, the front end 30 of the tongue is thereby displaced both in the longitudinal direction of the center rail 2 and in the height. The guided by the bearing part 27 portion of the tongue 26 is guided in a direction parallel to the longitudinal extent of the center rail 2 (or parallel to the withdrawal direction 35).

When the pull-out rail 3, starting from its fully retracted state (corresponding to Fig. 1 and 2 ) is pulled out, the center rail 2 initially shifts differentially to this. The tongue 26 is initially in a passive end position. When in the Fig. 3 to 6 reached pull-out position is reached, the stop 34 of the drive member 32 runs against a counter-stop 38 of the carcass rail 1. Upon further extension of the pull-out rail 3, the middle rail 2 initially also moves further in the pull-out direction 35. The drive part 32 is held stationary relative to the carcass rail 1 and thus shifts relative to the bearing part 27 and the middle rail 2. Thus, the drive gear 31 rotated from the bearing part 27 and the drive gear 31 moves the tongue 26 relative to the center rail 2, wherein the end 30 of the tongue 26 moves toward the front end 12 of the center rail 2 and according to the slotted guide down. The end 30 of the tongue 26 is guided in this case to the gap between the support roller 16 and the differential roller 17.

In this first section of the extraction of the puller runs the catwalk 10 of the pull-3 by the gap between the differential roller 17 and the support roller 16. In the in the Fig. 7 to 11 illustrated pull-out position of the pull-out rail 3 moves the catwalk 10 of the pull-3 from this gap, ie the tracks on the top and bottom of the catwalk 10 get out of engagement with the support roller 16 and the differential roller 17th Latest at this pull-out the tongue 26 is retracted into the gap between the support roller 16 and the differential roller 17.

It is preferred if the end 30 of the tongue 26 is already slightly ahead of in the Fig. 7 to 11 illustrated pull-out position of the pull-out rail 3, in which the catwalk 10 is disengaged from the support roller 16 and the differential roller 17, is retracted into the gap between the support roller 16 and the differential roller 17. For this purpose, the catwalk 10 has at its rear end a recess 39 which is at least over a portion of their relation to the longitudinal extent of the pull-3 rail extension narrower than the raceways engaging with the running surfaces of the support roller 16 and the differential roller 17. In this recess 39 moves a subsequent to the end 30 of the tongue portion of the tongue 26 before reaching in the Fig. 7 to 11 shown pull-out of the pull-3, preferably at least 2mm before reaching this pull-out.

The recess 39 and the tongue 26 then at its end 30 are wedge-shaped in the embodiment shown, as is preferred.

When the catwalk 10 is extended out of the gap between the differential roller 17 and the support roller 16, the tongue 26 thus assumes its active end position. The Ausziehstrecke between the start of the stopper 34 to the counter-stop 38 and the extension of the catwalk 10 from the gap between the differential roller 17 and the support roller 16 (in which in Fig. 7 to 11 shown pull-out position) is preferably less than 5cm.

The displaceably mounted drive member 32 with the teeth 33 and the stop 34 and the drive gear 31, which meshes with the toothing 28 of the tongue 26, in this embodiment thus form the displacement device for displacing the tongue 26 from its passive to its active end position.

When the pull-3 from the in the Fig. 7 to 11 shown extended position, so there is no further displacement of the center rail 2 in the pull-out direction 35, since the catwalk 10 is out of engagement with the differential roller 17. At this position of the center rail 2, a stop for the middle rail 2 is also conveniently provided, by which the extension of the middle rail 2 is limited at this position.

The in the Fig. 7 to 11 shown pull-out corresponds in the embodiment shown a full extension, in which the pull-3 is extended substantially to the length of the carcass rail 1. Such a design, in which the differential roller 17 and support roller 16 at the moment of extension of the catwalk 10 from the gap between them have substantially reached the front end of the carcass rail 1, is preferred.

The pull-out rail 3 can be pulled further into the region of the over-extension, wherein the middle rail 2 with respect to the carcass rail 1 remains stationary until in the Fig. 12 to 14 shown pull-out position is reached. Further stripping is limited by appropriate stops.

When inserting the pull-3 from its fully extended state ( Fig. 12 to 14 ) runs the catwalk 10 at the in the Fig. 7 to 11 shown extension position of the pull-3 in the gap between the support roller 16, 17 a. Here, when it enters this gap, it abuts the tongue 26 in its end region pushed into this gap. Upon further insertion of the pull-out rail 3, the catwalk 10 thus displaces the tongue 26 against the withdrawal direction 35. The end 30 of the tongue is displaced upwardly through the slotted guide 36, 37 until the catwalk 10 and the tongue 26 are disengaged. This is when in the Fig. 3 to 6 illustrated pull-out position of the pull-out rail 3 of the case. By the displacement of the tongue 26 relative to the middle rail 2 and the bearing part 27, the drive gear 31 is rotated and the drive member 32 is displaced in the direction of the front end 12 of the center rail 2. The tongue 26 thus returns to its passive end position and the drive device is back in its initial state.

By inserting the tongue 26 into the gap between the differential roller 17 and the support roller 16, these two rollers are kept correspondingly spaced when the catwalk 10 extends out of this gap, whereby the running culture is improved as already stated.

A pull-out guide according to the invention can furthermore be equipped with a pull-in automatic system (= self-closing device), which is preferred. Such self-feeds for differential extraction devices are known, for example from the cited in the introduction to the prior art.

Various modifications of the illustrated embodiment are conceivable and possible without departing from the scope of the invention. For example, the toothing 28 could be provided on a part connected to the tongue 26. For example, the tongue 26 could also be displaceably mounted directly by the middle rail 2.

Legend to the reference numbers:

1

cabinet member

2

middle rail

3

pull-out

4

vertical base bar

5

upper guide bar

6

lower guide bar

7

beading

8th

beading

9

vertical base bar

10

catwalk

11

side web

12

front end

13

rear end

14

front caster

15

rear caster

16

supporting role

17

differential roller

18

auxiliary role

19

Additional support roller

20

Auxiliary support member

21

section

22

section

23

section

24

attack

25

attack

26

tongue

27

bearing part

28

gearing

29

section

30

The End

31

drive gear

32

driving part

33

gearing

34

attack

35

pull-out

36

Kulissenausnehmung

37

spigot

38

counterstop

39

recess

Claims (10)

1. A pull-out guide for the pulling out of a movable furniture part from a furniture carcass, comprising a carcass rail (1) for securing to the furniture carcass, a central rail (2) which is displaceably guided with respect to the carcass rail (1) and on which one above the other there are rotatably mounted both a differential roller (17), having play in the vertical direction and rolling on a track of the carcass rail (1), and a supporting roller (16), and a pull-out rail (3), displaceably guided with respect to the carcass rail (1), which is for securing to the furniture part able to be pulled out and which has a running web (10) which upon pulling out of the pull-out rail as far as a first pulling-out position runs through the gap between the differential roller (17) and the supporting roller (16) and which upon further pulling out of the pull-out rail (3) runs out of the gap between the differential roller (17) and the supporting roller (16), characterised in that a tongue (26) is displaceably mounted on the central rail (2), which tongue is upon pulling out of the pull-out guide displaceable by a displacement device (31, 32) from a passive end position in which the tongue (26) lies outside of the gap lying between the differential roller (17) and the supporting roller (16) into an active end position in which the tongue is pushed into the gap lying between the differential roller (17) and the supporting roller (16).
2. A pull-out guide according to claim 1, characterised in that the displacement device has a driving toothed wheel (31) meshing with toothing of the tongue (26) or with a part connected to the latter.
3. A pull-out guide according to claim 2, characterised in that the displacement device comprises a driving part (32) having toothing (33), which driving part (32) meshes with the driving toothed wheel (31) or with a toothed wheel which drives the driving toothed wheel (31) directly or via at least one further gear member.
4. A pull-out guide according to claim 3, characterised in that the driving part (32) is displaceably mounted by the central rail (2) or by a bearing part (27) attached to the latter and has a stop (34) which upon pulling out of the pull-out rail (3) strikes against a counter stop (38) of the carcass rail or the pull-out rail before the first pulling-out position of the pull-out rail (3) has been reached and which upon further pulling out of the pull-out rail keeps the driving part (32) stationary with respect to the carcass rail (1) or pull-out rail (3).
5. A pull-out guide according to any one of claims 1 to 4, characterised in that the tongue (26) is, in the region of its end (30) able to be pushed into the gap lying between the supporting roller (16) and the differential roller (17), guided with respect to the central rail (2) by a motion-link guide.
6. A pull-out guide according to claim 5, characterised in that the motion-link guide comprises a motion-link cutout (36) arranged in the central rail (2) and a peg (37) which is attached to the tongue (26) and which engages the motion-link cutout (36).
7. A pull-out guide according to any one of claims 1 to 6, characterised in that the end (30), able to be pushed into the gap lying between the differential roller (17) and the supporting roller (16), of the tongue (26) is upon displacement of the tongue (26) from the passive into the active end position displaced both in the longitudinal direction of the central rail (2) and vertically.
8. A pull-out guide according to any one of claims 1 to 7, characterized in that upon pushing in of the pull-out rail (3), the running web (10) of the pull-out rail (3) travels, starting from its completely pulled-out position, in the first pulling-out position into the gap lying between the differential roller (17) and the supporting roller (16) and in this case collides against the end face of the tongue (26) and displaces the tongue (26) into the passive end position upon further pushing in of the pull-out rail.
9. A pull-out guide according to any one of claims 1 to 8, characterised in that all rollers (14-19) are for mutual displaceable guiding of the rails (1-3) rotatably mounted on at least one of the rails (1-3).
10. A pull-out guide according to claim 9, characterised in that all rollers (14-19) are for mutual displaceable guiding of the rails (1-3) rotatably mounted on the central rail (2).

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