EP2992780B1 - Drawer slide - Google Patents

Description

The invention relates to a pull-out with a fastened to a furniture body carcass, attachable to a pull-out furniture part pull-out rail and arranged between the carcass rail and the pull-out middle rail, the rails are mutually slidably guided and at least the pull-out relative to the center rail by means of at least one of the rails rotatably mounted rollers is guided displaceably.

For pull-out guides for extracting pull-out furniture parts, especially drawers, different embodiments exist. Most extenders, which are more or less mirror-inverted, arranged on both sides of the pull-out furniture part.

In roller extension guides rollers serving for displacement of the rails are rotatably mounted on the rails about (at least substantially) stationary to these axes lying. Various embodiments of roller pull-out guides are known. In conventional telescopic extension guides load-transmitting rollers are rotatably mounted on all rails and it will be extended without further action, the pull-out and the center rail successively from the carcass rail. It comes at the end of Ausziehweges pull-out of the middle rail to a stop of the pull-out on the center rail and an associated shock, whereby the running culture is impaired. Therefore, excerpts have been developed according to the telescopic design, in which additional measures are provided to achieve a synchronous operation (= differential run) of the rails, wherein the middle rail only covers half the distance of the pull-out rail with respect to the carcass rail. In addition to circulating belts, which are associated with a high assembly cost, For this purpose, a rotatably mounted on the center rail and a window recess of the center rail passing through elastic drive roller was used, but does not represent a load-transmitting role. Such a telescopic extension with differential effect is for example in the AT 392 883 B described.

Furthermore, roller extension guides according to the differential type are known, in which a rotatably mounted on the center rail load-transmitting differential roller is present, whereby a synchronous or Differentialiallauf the rails is achieved. In this case, the middle rail only covers half the path of the pull-out rail with respect to the carcass rail. In such pull-out guides, which are also referred to as differential roller pull-out guides or shorter differential pull-out guides and have a high running culture, advantageously all the rollers can be rotatably mounted on the middle rail. Such role differential extension guides are for example in the AT 391 603 B . AT 505 053 B1 and EP 2 074 909 B1 described.

Current pullout guides are often equipped with dampened pull-in mechanisms that pull the inserted part of the extendable furniture part in the last section of the retraction movement in the fully retracted state. For example, in the differential extension guides of the aforementioned writings AT 505 053 B1 and EP 2 074 909 B1 Such dampened intake mechanisms exist.

In the operation of pull-out guides with a differential run of the rails may be the case that the pull-out rail when inserting the pull-out guide is behind its intended position. This has the consequence that the center rail reaches its fully inserted position in front of the pull-out rail. In order to achieve also the fully retracted position of the pull-out rail, in the case of a roller pull-out guide with a differential running of the rails causing differential or drive roller must be a sliding shift relative to the surface of the differential guide the rail-causing role. It is characterized a greatly increased effort required, which also depends on the weight of the pull-out furniture part and its loading. In the case of the embodiment of the pull-out guide with a damped pull-in mechanism, such an increased force expenditure can not usually be applied by the pull-in mechanism, so that the pull-out rail is not completely retracted by the pull-in mechanism.

In addition to roller pull-out guides, in which the rollers are rotatably mounted on the rails, pullout guides are also known, which have equipped with balls or rollers carriage. These have in each case their own advantages and disadvantages compared to roller pull-out guides, whereby the problems resulting from the design and construction differ considerably from those of the roller pull-out guides. Pull-out guides, which have trolleys equipped with balls or rollers, have less good running properties than roller pull-out guides. In addition, in such pullout guides, which have equipped with balls or rollers carriage, the pull-out rail is not designed detachable from the middle rail without tools. In contrast, this is generally the case with roller pull-out guides. Thus, the assembly of Ausziehschienen can be done on both sides of the extendable furniture part with removed slide rails. Additional adapter rails on the pull-out furniture part to connect this with the pull-out rails, so are not required.

In order to prevent errors in the positioning of the carriage (= carriage error) in Ausziehführungen which equipped with balls or rollers with trolley, but also to achieve a synchronism between a carcass rail, center rail and pull-out of such a pull-out guide, it is known forced controls be provided in which gears mesh with rack profiles. Thus, carriages may be provided with such rack profiles. Furthermore, it is known to provide such toothed bar profiles on the carcass rail and on the pull-out rail, wherein a rotatably mounted on the center rail gear is in meshing with these. Pull-out guides, which have balls fitted with balls or rollers and are designed with such positive controls, go for example from the DE 10 2004 002 823 A1 . DE 20 307 757 U1 . US 3,857,618 A and DE 20 2010 007 999 U1 out.

Also from the DE 20 2010 011 854 U1 goes out a pull-out with arranged between the rails carriage, which are formed with rack profiles. In order to ensure an engagement of the gear in the rack profiles even at a greater load on the pull-out guide in the extended state of the pull-out, at least one rack-and-pinion profile inclined relative to the pull-out direction is provided. To form this inclination nubs are present at the top of the carriage, which are supported on an associated running surface of the rail and increase in the direction of withdrawal. In this way, the carriage can yield elastically depending on the load situation between the support points of the knobs against the engagement of the pinion on the rack.

The DE 20 2008 013 242 U1 shows a further pull-out with arranged between the rails carriage, which have rack profiles. The axes of the meshing with the rack profiles gears are hereby elastically mounted relative to the center rail.

From the DE 20 2004 006 284 U1 goes out a further pull-out with arranged between the rails carriage, which have rack profiles. For further prevention of carriage errors rack rails are provided here in addition to the pull-out and the carcass rail, which mesh with a rotatably mounted on the center rail gear.

To tilt the arranged on both sides of the extendable furniture part extending guides when pulling and pushing the pull-out furniture part to prevent parallel guidance devices are known. Here are arranged on the carcass rails arranged on the two sides of the pull-out furniture part pull-out rack rails, which mesh with gears, which are connected to each other via a parallel guide shaft. Such parallel guidance devices, for example, go from the EP 1 649 782 B1 and AT 13 357 U out. In order to enable the parallel guidance also via a full extension or over extension of the pull-out, pivoting gear carrier are described in the first-mentioned font with transmission gears, which mesh with the parallel guide gears. In the latter document front pivotable rack sections are provided on the carcass rails, which are pivoted when pulling the extension guides from a vertical rest position to a horizontal active position.

Another generic pull-out is from the AT7723U known. The object of the invention is to provide an advantageous pull-out of the aforementioned type with a high running culture. According to the invention, this is achieved by a pull-out guide with the features of claim 1.

In a pull-out guide according to the invention, the carcass rail has a first rack profile and the pull-out rail has a second rack profile. At the center rail, a gear unit having at least one gear is arranged, which is in meshing with the first rack profile and the second rack profile for positively controlling a synchronous running of the rails when pulling the pull-out in a pull-out direction and insertion of the pull-out rail. Here, at least a portion of the longitudinal extension of one of the rack profiles from a basic position into a release position in which the tooth engagement with the gear unit is canceled, elastically deflected. Thus, the force caused by the positive control positive engagement between the center rail and the rail, which has the at least partially elastically deflectable rack profile, be repealed. The adjustment of the basic position in the release position can hereby advantageously by exercising a sufficiently high, acting parallel to the withdrawal force be achieved between the middle rail and the rail, which has the at least partially elastically deflectable rack profile. Such a force results in a force component acting in the sense of pushing the teeth apart. When the force acting parallel to the pull-out direction exceeds a threshold value, the teeth of the gear unit and of the at least partially elastically deflectable rack profile are disengaged, if this rack profile is elastically deflectable in the region in which the toothed engagement with the gear unit is present.

Such a positive control in conjunction with the displaceable guide of the pull-out rail relative to the middle rail by means of rollers rotatably mounted on at least one of the rails (ie, the axis of a respective roller is at least substantially stationary relative to the respective rail), a high running culture with a synchronous run the rails are provided. In addition, it is possible that the pull-out of the center rail, in particular without tools, can be removed, for example, for mounting on the pull-out furniture part, and can be used in a montage friendly way back to the center rail. Advantageously, the tooth engagement between the gear unit and the at least partially elastically deflectable rack profile in the elastically deflectable region of this rack profile is present when the center rail is in its fully inserted into the carcass rail position. The removed pull-out can thus be used in this fully inserted position of the center rail in the middle rail and inserted until it is also in its fully retracted position, the positive control between the rails by the elastic deflectability of at least a portion of the racks can be overcome ,

The removability of the pull-out rail from the center rail can be realized in a manner usual for roller pull-out guides, in particular by means of an adjustable safety-release part. When the safety catch part is in its open position, one can, with respect to the pull-out direction, be raised front end of the pull-out, so that stop elements of the pull-out rail and the center rail can be moved past each other. In the blocking position of the anti-hanger part, the lifting of the front end of the pull-out rail is blocked at least to the extent that the stop elements of the pull-out rail and the middle rail can not be moved past each other and the extraction of the pull-out rail from the center rail is limited by these cooperating stop elements.

In an advantageous embodiment of the invention, the center rail relative to the carcass rail is guided displaceably by means of at least one of the rails rotatably mounted rollers. It is then a pure roller pull-out, in which the sliding guide both the center rail relative to the carcass rail and the pull-out relative to the center rail by rotatably mounted about rollers and not arranged by means of between the rails and with respect to these movable carriage , which are equipped with rolling elements. It can thus also, in particular tool-free, removability of the center rail of the carcass rail, for example, for maintenance purposes, are made possible.

In one possible embodiment of the invention, all rollers are rotatably mounted on the middle rail for displaceable guidance of the rails. It may conveniently be provided here also a load-transmitting differential role, which is rotatably supported with vertical play relative to the center rail on this and from which a load is transmitted directly from the puller rail on the carcass rail. The arrangement and design of the rollers including the differential role here may be according to conventional differential roller extension guides. The differential roller supports the synchronous movement of the rails, which supports the positive control caused by the gear unit and rack profiles. It can thereby be achieved particularly advantageous running characteristics of the pull-out, whereby the positive mutual control of the correct mutual position of the rails can be ensured during normal operation. Nevertheless, the pull-out rail, especially for assembly and maintenance purposes, removed and reused in a practical way.

An advantageous embodiment of the invention provides that the gear unit has about a common axis of rotation rotatably mounted first and second gears, of which the first gear cooperates with the first rack profile and the second gear with the second rack profile. The rack profiles can thus be arranged laterally offset from each other, which can facilitate the arrangement in the pull-out, especially in the form of a roller differential extension pull. At the same distance of the teeth of the rack profiles, in this case the first and second gears favorably have the same number of teeth. The first and second gears may advantageously be rotatably mounted about a common axis of rotation of a mounted on a base profile of the center rail bearing part. A storage directly on the base profile of the center rail is conceivable and possible.

Conceivable and possible but would also be an embodiment in which the transmission unit has only a single gear, which meshes with the positive pressure control of the rails both with the first rack profile and with the second rack profile. The gear could in this case be rotatably mounted on a journal of a bearing part of the gear unit, which is fixed to the center rail, or on a directly attached to the base profile of the center rail axle. The connection with the journal could also be rigid and the axle journal rotatably mounted.

In order to enable a full extension or over-extension and to maintain the positive control over the entire length of the extension, it can be provided to arrange a pivotable rack member on the carcass rail or on the pull-out rail. This is between an active position, in which it continues the rack profile of the rail on which it is arranged, and a passive position in which it is at an angle to this rack profile, pivotable. In the fully extended state of Pull-out is the pivotable rack piece in its active position and is in mesh with the gear unit. In the retracted state of the pull-out guide, the rack-and-pinion piece is in its passive position, wherein it does not project beyond the base profile of the rail in relation to the pull-out direction, on which it is pivotably mounted.

• Fig. 1 und 2 Schrägsichten einer Ausziehführung gemäß einem Ausführungsbeispiel der Erfindung, in eine Blickrichtung auf die Seite der Anbringung des ausziehbaren Möbelteiles und in eine Blickrichtung auf die Seite der Anbringung am Möbelkorpus, im vollständig eingefahrenen Zustand der Ausziehführung;
• Fig. 3 und 4 Schrägsichten analog Fig. 1 und 2, aber nur der Teile der Zwangssteuerung;
• Fig. 5 und 6 Schrägsichten der Ausziehführung in den Blickrichtungen entsprechend Fig. 1 und 2, aber im vollständig ausgezogenen Zustand der Ausziehführung;
• Fig. 7 und 8 Schrägsichten analog Fig. 5 und 6, aber nur der Teile der Zwangssteuerung;
• Fig. 9 und 10 Schrägsichten der Ausziehschiene und der Korpusschiene in der Blickrichtung entsprechend den Fig. 1 und 5;
• Fig. 11 und 12 Seitenansichten der Korpusschiene in der Grundstellung und in der Freigabestellung des elastisch auslenkbaren Abschnitts des Zahnstangenprofils der Korpusschiene;
• Fig. 13 ein vergrößertes Detail A von Fig. 12;
• Fig. 14 und 15 Schrägsichten der Mittelschiene in den Blickrichtungen entsprechend Fig. 1 und 2;
• Fig. 16 eine Seitenansicht der Mittelschiene;
• Fig. 17 und 18 Schrägsichten der Mittelschiene entsprechend den Fig. 14 und 15, aber ohne die Getriebeeinheit;
• Fig. 19 eine Schrägsicht der Ausziehführung in einer Blickrichtung entsprechend Fig. 1, beim Einsetzen der Ladenschiene, der elastisch auslenkbare Abschnitt des Zahnstangenprofils der Korpusschiene noch in seiner Grundstellung;
• Fig. 20 ein vergrößertes Detail B von Fig. 19;
• Fig. 21 eine Seitenansicht der Ausziehführung in der Stellung der Schienen entsprechend Fig. 19;
• Fig. 22 ein vergrößertes Detail C von Fig. 21;
• Fig. 23 eine Schrägsicht der Ausziehführung analog Fig. 19, der elastisch auslenkbare Abschnitt des Zahnstangenprofils der Korpusschiene aber in einer Zwischenstellung zwischen seiner Grundstellung und seiner Freigabestellung;
• Fig. 24 ein vergrößertes Detail D von Fig. 23;
• Fig. 25 eine Seitenansicht der Ausziehführung in der Stellung der Schienen entsprechend Fig. 23;
• Fig. 26 ein vergrößertes Detail E von Fig. 25;
• Fig. 27 eine Schrägsicht der Ausziehführung analog Fig. 19, der elastisch auslenkbare Abschnitt des Zahnstangenprofils der Korpusschiene aber in seiner Freigabestellung;
• Fig. 28 ein vergrößertes Detail F von Fig. 27;
• Fig. 29 eine Seitenansicht der Ausziehführung in der Stellung der Schienen entsprechend Fig. 27;
• Fig. 30 ein vergrößertes Detail G von Fig. 29;
• Fig. 31 und 32 Schrägsichten der Getriebeeinheit in Blickrichtungen entsprechend den Fig. 1 und 2.

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

• Fig. 1 and 2 Oblique views of a pull-out according to an embodiment of the invention, in a line of sight on the side of the attachment of the pull-out furniture part and in a line of sight to the side of the attachment to the furniture body, in the fully retracted state of the pull-out;
• 3 and 4 Oblique views analog Fig. 1 and 2 but only the parts of the compulsory control;
• FIGS. 5 and 6 Oblique views of the pull-out guide in the viewing directions accordingly Fig. 1 and 2 but in the fully extended state of the pull-out guide;
• FIGS. 7 and 8 Oblique views analog FIGS. 5 and 6 but only the parts of the compulsory control;
• FIGS. 9 and 10 Oblique views of the pull-out rail and the carcass rail in the viewing direction according to the Fig. 1 and 5 ;
• FIGS. 11 and 12 Side views of the carcass rail in the basic position and in the release position of the elastically deflectable portion of the rack profile of the carcass rail;
• Fig. 13 an enlarged detail A of Fig. 12 ;
• Fig. 14 and 15 Oblique views of the center rail in the viewing directions accordingly Fig. 1 and 2 ;
• Fig. 16 a side view of the center rail;
• Fig. 17 and 18 Oblique views of the center rail according to the Fig. 14 and 15 but without the gear unit;
• Fig. 19 an oblique view of the pull-out in a line of sight accordingly Fig. 1 , when inserting the drawer rail, the elastically deflectable portion of the rack profile of the carcass rail still in its normal position;
• Fig. 20 an enlarged detail B of Fig. 19 ;
• Fig. 21 a side view of the pull-out in the position of the rails accordingly Fig. 19 ;
• Fig. 22 an enlarged detail C of Fig. 21 ;
• Fig. 23 an oblique view of the pull-out analog Fig. 19 but the elastically deflectable portion of the rack profile of the carcass rail but in an intermediate position between its basic position and its release position;
• Fig. 24 an enlarged detail D of Fig. 23 ;
• Fig. 25 a side view of the pull-out in the position of the rails accordingly Fig. 23 ;
• Fig. 26 an enlarged detail E of Fig. 25 ;
• Fig. 27 an oblique view of the pull-out analog Fig. 19 , the elastically deflectable portion of the rack profile of the carcass rail but in its release position;
• Fig. 28 an enlarged detail F of Fig. 27 ;
• Fig. 29 a side view of the pull-out in the position of the rails accordingly Fig. 27 ;
• Fig. 30 an enlarged detail G of Fig. 29 ;
• FIGS. 31 and 32 Oblique views of the gear unit in viewing directions according to the Fig. 1 and 2 ,

An embodiment of a pull-out according to the invention is in the FIGS. 1 to 32 shown. The pull-out guide is designed as a roller pull-out guide in the form of a differential extension.

The pull-out guide is used to pull out a pull-out furniture part 1 from a furniture body 2, of which only in Fig. 1 Sections are indicated by dashed lines. The extendable furniture part 1 may in particular be a drawer, wherein the invention can also be used with other extendable furniture parts, such as trays or cabinet extensions. The pull-out guide shown in the figures is in the mounted state on one side of the pull-out furniture part 1 between the extendable Furniture part 1 and a side wall of the furniture body 2 is arranged. On the other side of the pull-out furniture part, a mirror-image pull-out guide can be arranged. Deviations from a precisely mirror-image training are possible. In other embodiments, the pull-out guide could basically also be arranged on the underside of the pull-out furniture part 1 between the pull-out furniture part 1 and a section of the furniture carcass 2.

The pull-out guide comprises a body rail 4 to be fastened to the furniture body 2, a pull-out rail 6 to be fastened to the pull-out furniture part 1 and a middle rail 5 lying between them. Starting from its completely retracted position (cf. Fig. 1 and 2 ), the pull-6 can be pulled out in a pull-3 until it reaches its fully extended position, see. FIGS. 5 and 6 , the center rail 5 moves when pulling the pull-out rail 6 with half the speed of the pull-out rail 5 in the pull-out 3, so over half the distance (= differential running or synchronism of the rails).

The carcass rail 4 has a vertical base web 7, with which it rests in the mounted state on the furniture body 2, and connected to the base web 7 in the region of its upper or lower edge upper and lower horizontal flanges 8, 9, which to their free edges conveniently with each other are provided to directed Umbördelungen.

The pull-out rail 6 has a vertical base web 10 and a horizontal flange 11 connected to the base web 10 in the region of its upper edge. The fastening of the pull-out furniture part 1 takes place on the base web 10. The base web 10 could also be connected to a horizontal flange in the region of its lower end, on which the pull-out furniture part rests.

For mutually displaceable guidance of the pull-out rail 6 relative to the middle rail 5 and the middle rail 5 relative to the carcass rail 4 are rollers 12 to 17, which have parallel axes. The axes are stationary at right angles to the withdrawal direction 3 and are in particular horizontal

In the illustrated embodiment, the rollers 12 to 17 for mutually displaceable guide rails 4, 5, 6 all at the center rail 5 to the center rail 5 at least substantially stationary axes (the axis of the differential roller 16 has respect to the middle rail 5 a game on how mentioned below) rotatably mounted. Other role arrangements with a rotatable mounting of rollers on the pull-out rail and / or carcass rail but are conceivable and possible.

On the base profile 19 of the middle rail 5 is in the region of its front end with respect to the withdrawal direction 3 a front roller 12, in the region of its rear end a rear roller 13 and in its central region a first and a second middle roller 14, 15 and a differential roller sixteenth rotatably mounted, as is known, for example from the aforementioned prior art relating to differential roller extension guides. The load-transmitting differential roller 16 cooperates both with a track at the top of the lower horizontal flange 9 of the carcass rail 4 and with a track at the bottom of the horizontal flange 11 of the pull-6. Due to the differential roller 16, it also comes without the positive control described below to a differential run of the rails 4, 5, 6, but it may come to misalignment between the rails, for example, due to slippage.

Behind the differential roller 16 is conveniently an auxiliary roller 17 rotatably mounted on the base profile 19 of the center rail, as is also already known. Before the differential roller 16 a support member 18 is conveniently arranged for sliding bearing. The auxiliary roller 17 and / or the support member 18 could also be omitted.

If no full or even over extension is desired, the middle roller 14 and with it also the support member 18, omitted.

In the exemplary embodiment, the center rail is formed double cranked, with upper and lower vertical sections 20, 21 and a laterally offset thereto central vertical section 22, whereby a stable formation is achieved. Also training with only one bend or a continuous vertical web are conceivable and possible and well known.

The center rail 5 is provided with various stop members to limit the mutual displacement of the rails 4, 5, 6.

The stop element 23 (see. Fig. 15 ) of the center rail 5 serves to limit the extraction of the center notes 5 from the carcass rail 4 and acts with the stop element 24 (see. Fig. 10 ) of the carcass rail 4 together. The stopper member 23 is pivotally mounted on the center rail 5 and for removing the center rail 5 from the carcass rail 3, the stopper member 23 can be pivoted upward. The stop element 25 (see. Fig. 15 ) of the center rail 5 limits the insertion of the middle rail 5 in the carcass rail 4 and acts with the stop element 26 (see. Fig. 10 ) of the carcass rail 4 together. The reference to the withdrawal direction 3 front abutment surface of the stop element 27 (see. Fig. 14 ) of the center rail 5 limits the insertion of the pull-6 in the middle rail 5 and acts with the stop element 28 (see. Fig. 6 ) of the pull-out rail 6 together. The stop element 28 is formed by a gradation of a downward flanging of the horizontal flange 11 of the pull-out rail 6. Another, not visible in the figures gradation of downward flaring of the horizontal flange 11 of the pull-out rail 6 cooperates with the relative to the pull-out 3 rear surface of the stop element 27 of the center rail 5 and limits the extraction of the pull-6 from the center rail. 5 At the middle rail 5, a safety catch part 29 is arranged, which in the in the Fig. 14 to 16 illustrated position lifting the front end of the pull-out rail 6 relative to the middle rail 5 blocked so far that the aforementioned stop element of the pull-6 is not over the stop element 27 can be raised. The Aushängsicherungsteil 29, starting from the in the Fig. 14 to 16 shown position relative to the base profile 19 of the center rail 5 is moved in the pull-3 and then raised with its front end. In this position, the pull-out rail can be completely removed by raising its front end in the withdrawal direction 3 of the center rail 5. Stop elements and a Aushängsicherungsteil the type described above are basically known in differential roller extension guides.

The pull-out guide according to the invention further has a positive control for the synchronous running of the rails 4, 5, 6 during extension and insertion of the pull-out rail 6. For this purpose, the carcass rail 4 has a first rack profile 30 and the pull-out rail 6 has a second rack profile 31. The rack profiles 30, 31 are formed in the embodiment of rack parts, which are connected to the base profiles 32, 33 of the carcass rail 4 and pull-out rail 6. The rack profile 30 and / or 31 could also be formed by a web of the respective base profile 32, 33, which is provided with a toothing.

The rack profile 30 extends over a front part of the longitudinal extension of the carcass rail 4 relative to the pull-out direction 3. The rack profile 31 extends over a rear part of the extension of the pull-out rail 6 relative to the pull-out direction 3.

At the middle rail 5, a transmission unit 34 is arranged. This comprises a first and a second gear 35, 36, which are rotatably mounted about a common axis of rotation 37. The axis of rotation 37 is at right angles to the withdrawal direction 3 and horizontal. In the exemplary embodiment, the axis of rotation 37 is formed by an axle pin 38, on which the gears 35, 36 are fixed on both sides and which is rotatably supported by a bearing part 39, which is fixed to the base profile 19 of the center rail 5. A rigid arrangement of the axle 38 on the bearing part 39 and rotatable mounting of the gears 35, 36 on the axle 38 is conceivable and possible.

A bearing part 39 could also be omitted, so that the axle pin 38 would be directly connected to the base profile 19 of the center rail 5 (rotatable or non-rotatable).

The axle pin 38 is a direction perpendicular to the axis of rotation 37 and at right angles to the withdrawal direction 3, ie in the exemplary embodiment in the vertical direction, elastically deflectable. It can be absorbed by manufacturing tolerances. This elastic deflectability is achieved in the embodiment by an elastic deformability of the bearing part 39.

For synchronous control of the rails 4-6, the first gear 35 meshes with the first rack profile 30 and the second gear 36 with the second rack profile 31.

In the area of the front end of the carcass rail 4 relative to the pull-out direction 3, a toothed rack piece 40 is mounted pivotably with respect to the carcass rail 4. In the fully retracted state of the pull-out this assumes a passive position, in which it is with its longitudinal extent at an angle to the withdrawal direction 3, preferably at an angle of 45 ° to 90 °. When the pull-6 is pulled out from its fully retracted position in the pull-3, it comes in the course of this extraction to a pivoting of the rack piece 40. This pivoting is initially by the center rail 5, which with their relative to the pull-3 front end to the rack piece 40 anfährt. In the further course of the extraction, the rack piece 40 slides over the surface 41 of the base profile 19 of the middle rail 5 and attached to the base profile 19 bracket 42. The rack piece 40 then forms an extension of the first rack profile 30. Over a final section of the pull-out of the pull-out leaves first gear 35, the first rack profile 30 and engages with the teeth of the rack section 40. The rack section 40 is in this case pivoted into its active position, see. Fig. 5 to 8 , It is achieved by a positive control for the synchronous operation of the rails 4 -6 for a full or even pull-out of the pull-out furniture part.

If such a full or over extension is not desired, the rack piece 40 can also be omitted.

When inserting the pullout guide, the rack piece 40 pivots again by gravity into its passive position.

The rack profiles 30, 31 have longitudinal extensions, which lie parallel to the withdrawal direction 3 over at least the majority of their expansions. Only the first toothed rack profile has an area adjoining the rear end with respect to the pull-out direction 3, in which region it runs obliquely to the pull-out direction 3. In this area, the first gear 35 engages in the first rack profile 30 when the differential roller 16 moves into a recessed area of the lower horizontal flange 9 of the carcass rail 4 in a final portion of insertion of the pull-out rail 6 before reaching the fully retracted condition of the pull-out guide. This recessed area 43 forms a sloping ramp for the differential roller 16, so that a self-closing over a final portion of retraction of the pull-6 is achieved. A corresponding recessed area 44 is provided for the auxiliary roller 17. The relative to the pull-out 3 rear end of the first rack profile 30 obliquely downwardly extending portion of the first rack profile 30 is particularly good Fig. 11 seen.

In the adjoining the rear end of the first rack profile 30 area in which the first rack profile 30 extends obliquely down to its rear end, the first rack profile 30 can be deflected elastic upwards. For this purpose, the upper horizontal flange 8 of the carcass rail 4, below which the first toothed rack profile 30 extends, has a window recess 45 in this area.

Via the portion 46 of this elastically deflectable region of the first rack profile 30, the deflectability is so great that the toothed engagement with the first gear 35 of the gear unit 34 can be canceled by the elastic deflection, ie, the teeth of the first gear 35 out of engagement the teeth of the first rack profile 30 can be brought. The first rack profile 30 thus has a portion 46 of its longitudinal extension, in which the first rack profile 30 can be elastically deflected from a basic position in which a meshing engagement with the first gear 35 of the gear unit 34 in a release position in which the meshing with the first gear 35 is released. The elastic deflection takes place in a direction perpendicular to the axis of rotation 37 of the gear 35, which cooperates with the rack profile 30. In the exemplary embodiment, the direction of the elastic deflection is substantially vertical.

This makes it possible in a simple manner that, after the pull-6 has been removed from the pull-out, for example, for mounting on the pull-out furniture part 1, this in turn is inserted into the middle rail 5 of the pull-out. This will be explained below on the basis of FIGS. 19 to 30 explained.

The insertion of the pull-out rail 6 can be advantageously carried out at fully inserted middle rail 5. Fig. 19 to 22nd show the state when the pull-6 has just been inserted into the middle rail 5 so far that the teeth of the arranged on the pull-6 6 second rack profile 31 engage with the second gear 36 (in the side view of FIGS. 21 and 22 are the teeth of the gears 35, 36 congruent). Upon further impressions of the pull-out rail 6 against the withdrawal direction 3, the oblique tooth flank 47 of a tooth of the first gear 35 is pressed against the sloping tooth flank 48 of a tooth of the first rack profile 30, resulting in a force component which is in the sense of lifting the first rack profile 30 from the first gear 35 acts. One of the oblique tooth flanks 47 of the teeth of the toothed wheel 35 and one of the oblique tooth flanks 48 of the teeth of the toothed rack profile 35 are in Fig. 28 designated.

The FIGS. 23 to 26 show just an intermediate position in which the force acting on the pull-out rail 6 against the pull-3 is so great that Teeth of the gear 35 and the rack profile 30 already slightly pressed apart, but are still engaged. By increasing the force acting on the pull-out rail 6 against the pull-out direction, the engaged teeth are increasingly pushed apart until they can be guided past one another with their tips, cf. Fig. 27. to 30 The tooth engagement between the first rack profile 30 and the first gear 35 is canceled at this time. After transfer via these two teeth, the two following teeth interact and the process repeats until the pull-out rail 6 is fully inserted.

Without such training with an elastically deflectable portion of the first rack profile 30, the pull-out 6 would have to be used in the fully extended state of the middle rails 5, which is difficult to handle, since the middle rail shifts against the pull-out direction 3 at low counter to the pull-3 acting forces. In addition, would have to be maintained on both sides in their fully extended positions with an insertion of an extendable furniture part 1, on which both sides Ausziehschienen. It could also be easy to faulty operations, so that the gear units 34 of the extension guides on both sides of the pull-out furniture part 1 is not exactly with the same teeth of the rack profiles 30, 31 in meshing.

In order to improve the elastic restoring force of the elastically deflectable portion of the first rack profile 30, the first rack profile 30 is provided in the embodiment at its rear end with a Abstützfortsatz 49, which is supported on the underside of the upper horizontal flange 8 of the carcass rail 4. The difference between the basic position of the deflectable portion of the first rack profile 30 and its release position is in particular from the comparison of 11 and FIG. 12 seen.

If the recessed area 43 (and thus also the recessed area 44) of the Carcass rail 4 is omitted, the first rack profile 30 would extend over the entire region of its longitudinal extent parallel to the withdrawal direction 3 (in the normal position of the deflectable portion 46). In the release position of the deflectable portion 46, the first rack profile 30 would then extend in this area to its rear end obliquely upward.

In normal operation of the pull-out guide (when none of the rails is removed or inserted), the first gear 35 is in the region of the deflectable portion 46 of the first rack profile 30 when the pull-out guide is fully collapsed. The positive control of the synchronous running of the rails by the rack profiles 30, 31 and the gear unit 34 but also takes place in this position of the pull-out guide, since the force acting between the first gear 35 and the first rack profile 30 force substantially lower than that for the deflection of the portion 46 of first rack profile 30 is required force from the basic position to the release position.

The first rack profile 30 could be elastically deflectable over its entire longitudinal extent instead of only over a portion of its longitudinal extent.

Instead of providing the first rack profile 30 with at least one deflectable portion 46, the second rack profile 31 could be elastically deflectable over its entire longitudinal extent, so that a deflection starting from a basic position in which a meshing between the second rack profile 31 and the second gear 36 is present, can take place in a release position in which the tooth engagement between the second rack profile 31 and the second gear 36 is canceled.

Various further modifications of the illustrated embodiment of the invention are conceivable and possible without departing from the scope of the invention. Thus, the pull-out guide could also have rollers arranged in a different manner for mutually displaceable guidance of the rails. It could also account for a differential role, the synchronous control between the Rails could also be done only by the rack profiles 30, 31 in conjunction with the transmission unit 34. For example, an arrangement of the rollers could be provided in the manner of a conventional telescopic extension. It would then not all rollers on the middle rail 5 rotatably mounted. An additional elastic driver roller (but not a load-transmitting role), as it is known for example from the aforementioned prior art, could also be provided here or omitted.

If the base profiles of the rails are formed so and the rollers are arranged so that the rack profiles 30, 31 can be arranged vertically one above the other, the gear unit 34 could also have only a single gear.

Depending on the design of the base profiles of the rails and arrangement of the rollers, it would also be conceivable and possible that the arranged on the pull-out rack profile with its teeth facing down and arranged on the carcass rail rack profile is lower and has with his teeth upwards. In particular, in such a configuration could also be provided instead of the rack piece 40, that in the region of the rear end of the pull-a toothed rack piece analogous to the rack piece 40 is pivotally mounted.

A pivotable rack piece could in principle also be provided for extending the lower rack profile (as in the embodiment of the rack profile 31), such rack rack then being able to be pivoted upwards in the retracted state of the pull-out guide by means of a spring.

Instead of the adjoining the rear end of the first rack profile 30 area in which the first rack profile 30 extends obliquely downward to its rear end to follow the movement of the gear unit 34, if at least one roller of the center rail in a recessed area of Carousel rail enters shortly before reaching the fully retracted position, the second rack profile 31 could then have at its front end a region over which it extends obliquely to its front end to the withdrawal direction 3 upwards.

Although a retraction mechanism (= a self-retraction) is not shown in the figures for the sake of simplicity, such will be advantageously used in many embodiments. For example, such a pull-in mechanism could be designed according to the prior art mentioned at the outset in connection with differential roller pull-out guides. By an inventive design with a positive control to synchronize the rails, the correct mutual position of the rails is ensured. This ensures a complete retraction of the pull-out guide even with a relatively low pull-in force of the pull-in mechanism. The feeder mechanism can thus be made relatively inexpensive. Legend to the reference numbers: 1 extendable furniture part 26 stop element 2 furniture body 27 stop element 3 pull-out 28 stop element 4 cabinet member 29 Safety catch part 5 middle rail 30 first rack profile 6 pull-out 31 second rack profile 7 base web 32 basic profile 8th horizontal flange 33 basic profile 9 horizontal flange 34 gear unit 10 base web 35 first gear 11 horizontal flange 36 second gear 12 front caster 37 axis of rotation 13 rear caster 38 axle pin 14 middle roller 39 bearing part 15 middle roller 40 Rack piece 16 differential roller 41 surface 17 auxiliary role 42 hanger 18 supporting part 43 recessed area 19 basic profile 44 recessed area 20 upper vertical section 45 window opening 21 lower vertical section 46 section 22 middle vertical section 47 tooth flank 23 stop element 48 tooth flank 24 stop element 49 Abstützfortsatz 25 stop element

Claims (10)

1. Pull-out guide having a carcass rail (4) securable to a furniture carcass (2), a pull-out rail (6) securable to a pull-out furniture part (1), and a middle rail (5) arranged between the carcass rail (4) and the pull-out rail (6), the rails (4 - 6) being guided displaceably relative to one another and the carcass rail (4) having a first rack profile (30) and the pull-out rail (6) having a second rack profile (31), and on the middle rail (5) there being arranged at least one gear unit (34) having at least one gear wheel (35, 36) which meshes with the first rack profile (30) and the second rack profile (31) for forced control of a synchronous running of the rails on pulling out the pull-out rail (6) in a pull-out direction (3) and pushing in the pull-out rail (6) counter to the pull-out direction (3), characterised in that at least the pull-out rail (6) is displaceably guided relative to the middle rail (5) by means of rollers (12 - 17) rotatably mounted on at least one of the rails, and in that at least one section (46) of the longitudinal extent of one of the rack profiles (30, 31) is elastically deflectable from an initial position into a release position, in which the meshing with the gear unit (34) is released.
2. Pull-out guide according to Claim 1, characterised in that the section (46) of the first rack profile (30) which adjoins a rear end, with respect to the pull-out direction (3), of the first rack profile (30) is elastically deflectable.
3. Pull-out guide according to Claim 1 or 2, characterised in that the middle rail (5) too is displaceably guided relative to the carcass rail (4) by means of rollers (12 - 17) rotatably mounted on at least one of the rails.
4. Pull-out guide according to one of Claims 1 to 3, characterised in that all the rollers are rotatably mounted on the middle rail (5).
5. Pull-out guide according to one of Claims 1 to 4, characterised in that the axis of rotation (37) of the at least one gear wheel (35, 36) of the gear unit (34) which meshes with the first and/or second rack profile (30, 31) for forced control of the rails, or in the case of more than one such gear wheel (35, 36) each of these gear wheels (35, 36), lies at right angles to the pull-out direction (3) and horizontally.
6. Pull-out guide according to one of Claims 1 to 5, characterised in that an axle pin (38), forming the axis of rotation (37) of the gear wheel (35, 36) of the gear unit or the axis of rotation (37) of at least one of the gear wheels (35, 36) of the gear unit, is elastically deflectable in a direction at right angles to the axis of rotation (37) and at right angles to the pull-out direction (3).
7. Pull-out guide according to Claim 6, characterised in that the axle pin (38) is fixed or rotatably mounted by a bearing part (39) of the gear unit (34), the bearing part (39) being elastically deformable in the direction at right angles to the axis of rotation (37) and at right angles to the pull-out direction (3).
8. Pull-out guide according to one of Claims 1 to 7, characterised in that the gear unit (34) has first and second gear wheels (35, 36) rotatably mounted about a common axis of rotation (37), of which the first gear wheel (35) cooperates with the first rack profile (30) and the second gear wheel (36) cooperates with the second rack profile (31).
9. Pull-out guide according to one of Claims 1 to 8, characterised in that on the carcass rail (4) or on the pull-out rail (6) is arranged a pivotable rack piece (40), which is pivotable between a passive position, in which it is at an angle to the rack profile (30, 31) of the rail on which the rack piece (40) is arranged, and an active position in which it continues the rack profile (30, 31) of the rail on which the rack piece (40) is arranged, the gear unit (34) meshing with the rack piece (40) in a fully pulled-out state of the pull-out guide.
10. Pull-out guide according to one of Claims 1 to 9, characterised in that the pull-out rail (6) is removable from the middle rail (5) without tools.

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