EP3624642A1

EP3624642A1 - Telescopic drawer slide

Info

Publication number: EP3624642A1
Application number: EP18729017.6A
Authority: EP
Inventors: Karl Raid; Wolfgang Müller
Original assignee: Fulterer AG and Co KG
Current assignee: Fulterer AG and Co KG
Priority date: 2017-05-19
Filing date: 2018-05-09
Publication date: 2020-03-25
Anticipated expiration: 2038-05-09
Also published as: AT519752A4; AT519752B1; PL3624642T3; EP3624642B1; ES2876073T3; WO2018209369A1

Abstract

A telescopic drawer slide comprises a body rail (3), a pull-out rail (5) and a central rail (4) arranged between the body rail (3) and the pull-out rail (5), which central rail has a first and a second rotatably mounted differential roller (8, 9) each of which has a bearing play in the vertical direction with respect to the central rail (4) and of which, the second differential roller (9) is arranged behind the first differential roller (8) with respect to the pull-out direction (50). The first and the second differential rollers (8, 9) interact with an upwardly directed running track (13) of the body rail (3) and a downwardly directed running track (14) of the pull-out rail (5). In an intermediate position of the rails in which the rear end of the downwardly directed running track (14) of the pull-out rail (5) lies at the second differential roller (9), the second differential roller (9) is located in the region (52) of a depression (25) and/or the first differential roller (8) is located in the region (53) of an elevation (26) of the upwardly directed running track (13) of the body rail (3).

Description

pull-out

The invention relates to a pull-out for taking out a

au sziehbaren furniture part of the furniture body in a pull-out, comprising a carcass rail for attachment to the furniture body, a pull-out rail for attachment to the extendable furniture part and arranged between the carcass rail and the pull-down middle rail, which has a first and a second dre hbar mounted differential role, respectively have a bearing clearance in the vertical direction relative to the center rail and of which the second

Differential roller is arranged relative to the withdrawal direction behind the first differential role, wherein the first and second differential roller with an upward track of the carcass rail and a downward trajectory of the pull-out cooperate and the first differential role when pulling the pull-out from an insertion position of the rails, in which the pull-out guide is fully collapsed, until in an extended position of the rails, in which the pull-out is fully extended, between the upward track of the carcass rail and the downwardly oriented track of the pull-out rail and the second differential role when pulling the pull-out from starting the insertion position of the rails up to an intermediate position of the rails between the upwardly directed track of the carcass rail and the downwardly oriented track of the pull-out rail and the other n Extracting the pull-out guide from the intermediate position. The rear end of the pull-out rail facing downwards is located in front of the second differential roller with respect to the pull-out direction.

Pull-out guides for extracting a pull-out furniture part, such as a drawer, from a furniture body are in different

Embodiments known. Einfachausziehführungen consist of an am

Furniture carcass to be mounted carcass rail and one on the extendable furniture part to be mounted pull-out rail. Full or over excisions additionally have a middle rail arranged between the carcass rail and the pull-out rail.

When the rails of a full or over extension pull out one after the other, it is called telescopic extension guides. These are at all

Rail load-bearing rollers rotatably mounted. In order to avoid attacks at the end of the respective Ausziehweges and thus improve the running culture, extracts were developed according to the telescope design, in which additional

Measures are provided to synchronize (= Differentialiallauf) the

Rails to reach, the middle rail relative to the carcass rail covers only halfway the puller rail. In addition to circumferential bands are arranged on the middle rail elastic

Mitnehmerrollen used, but which are not load-bearing roles. Such a telescopic extension with differential action is known for example from AT 392 883 B.

In addition, pull-out guides according to the differential type are known

(= Differentialausziehführungen), in which at the middle rail in the central region of its longitudinal extent a rotatably mounted load-transmitting differential roller is present, which runs between a track of the carcass rail and a track of the pull-out rail, with a synchronous (= Differentialiallauf) of the rails is achieved. Since the load is to be transmitted directly from the Auzieh- to the carcass rail via the differential roller, the differential role must be compared to the

Middle rail have a game in the vertical direction. This allows

Tolerances in the extension guide as well as changes in the geometry under load (by a certain compression of the differential roller and by a certain bending of the rails) are absorbed. Usually, in such Differentialausziehführungen having a high running culture, all rollers are arranged on the center rail. Such differential extension guides are

for example from AT 391 603 B, EP 2 074 909 A1, AT 008 11 U1, WO

2008/1 19091 A1, DE 198 39 728 A1, EP 1 820 422 A1, DE 202 08176 U1, AT 506 062 A-4, EP 2 428 136 A1, EP 1 350 444 A1 and EP 1 350 445 A1.

In order to increase the carrying capacity of the differential extension guide, it is known (see DE 202 08 176 U1), just behind the differential role to arrange a support roller, which has no play against the axle bearing it. Of the

Diameter of the support roller is slightly smaller than that of the differential role, so that the support roller in the empty state and with low loading of the extension guide has a distance from the raceways. Only at higher load comes the

Support roller in plant at least to the track of the carcass rail and can take a Tei I of the load. The disadvantage here is that the recordable part of the Tra glast in any case less than 50%.

An extraction device of the type mentioned is apparent from DE 198 39 728 A1. It is stated here that at least one roller mounted with radial play is provided in the longitudinal middle region of the middle rail. In the illustrated embodiment, in the middle of the middle rail rolling between a career of the pull-out rail and a track of the carcass rail

Differential role arranged. Another with game stored between the

Runners of the pull-out rail and the carcass rail lying roller is rotatably mounted at a distance of one quarter of the length of the center rail from the rear end of the center rail. Due to the relatively far-back arrangement of this further roller with game this can only one

comparatively small area of extracting the pull-out rail for

Contribute differential run of the rails and take only a smaller part of the load transfer.

The object of the invention is to provide an advantageous pull-out of the type mentioned, which can be designed for relatively high loads, with a high running culture of the pull-out is achieved.

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, according to a first alternative, a recess of the upwardly directed track of the carcass rail is provided at the location where the second differential roller is in the intermediate position of the rails. According to a second alternative of the invention, an elevation of the upwardly directed track of the carcass rail is provided in the region of the point at which the first differential roller is in the intermediate position of the rails. The intermediate position of the rails of the pull-out is in this case when, when pulling the pull-out the rear end of the downward career of the pull-out just the second

Differential role leaves, i. on further extension of the pull-out guide from the intermediate position, the second differential roller no longer contributes to the differential running of the rails. A combination of said depression and the aforementioned survey is conceivable and possible.

By forming the pull-out guide according to the invention with a first and a second differential roller, a relatively high load capacity of the pull-out guide can be achieved. By training the upward career of the

Carcass rail with a depression or with a survey in each area mentioned can here in spite of the use of a first and a second

Differential role even under different load conditions a high running culture of the extract can be achieved. This will be explained in more detail below.

In an advantageous embodiment of the invention is on the

Extraction direction related distance (ie the distance in the longitudinal direction of the

Rails) between the longitudinal center axis of the second differential roller and the longitudinal center axis of the first differential role less than a sixth of the length of the center rail. The second differential role can thereby contribute over a majority of Ausziehweges the pull-out to the differential running of the rails. Also, an advantageous load distribution between the first and the second differential role can be achieved. With regard to further rollers, the pull-out guide may preferably be designed according to the known prior art, for example with respect to a pressure roller arranged above the first differential roller and / or with respect to the pull-out direction in the region of the rear end of the

Middle rail arranged rear roller and / or with respect to a arranged in the region of the front end of the center rail front roller.

To avoid or at least reduce the lowering of the front end of the pull-out rail when pulling the pull-out under a high force acting on the pull-out rail weight, the downwardly directed

Track of the carcass rail on which the rear roller rolls, at least over a part of the length of the carcass rail sloping from back to front, as is basically already known (see the aforementioned DE 198 39 728 A1).

An advantageous embodiment of the invention provides that at a centrally acting load of the pull-out rail with a weight which is at least 50% of the test load of the pull-out, the second differential role assumes an upper stop position with respect to their bearing clearance in the vertical direction. In a preferred embodiment of the pull-out this is already at a

Weight of at least 30% of the test load of the case.

Through this training can be achieved that at such higher

Weight loads the second differential role in the extended position of

Rails, when the rear end of the downhill track of the

Pull-out rail in front of the second differential role is a part of the on the

Pull-out rail can absorb acting load. The test load is defined here in the standard DIN 4548 and is usually specified by the manufacturer. The test load refers to the maximum permissible center acting on the pull-out rail

Total weight, resulting from the dead weight of the pull-out furniture part and the charge. The test load is also called load capacity.

If in this document from "front" and "back" is mentioned, this is related to the pull-out, in which the pull-out of the pull-out can be pulled out starting from the contracted state of the pull-out. The terms "top", "bottom", "vertical" and "horizontal" refer to the usual horizontal operating position of the pull-out guide.

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

Fig. 1 and 2 oblique views of a pull-out according to a first

Embodiment of the invention in the fully collapsed insertion position and fully extended pull-out of the Sch ienen;

Fig. 3 is an oblique view of the rails in the disassembled state;

4 shows an end view of the pull-out guide from the rear;

Fig. 5 is a section along the line AA of Fig. 4 (in the insertion position of

Rails);

Fig. 6 is an enlarged detail B of Fig. 5;

Fig. 7 is an enlarged detail C of Fig. 5;

Fig. 8 to 10 representations corresponding to Figures 5-7 in the intermediate position of the rails.

Fig. 1 1 to 13 representations corresponding to Figures 5-7 in the extended position of the rails.

FIGS. 14 and 15 are oblique views of a second embodiment of a

Pull-out according to the invention;

16 shows an oblique view of the rails in the disassembled state;

Fig. 17 is an end view from the rear;

Fig. 18 is a section along the line DD of Fig. 17 (in the insertion position of the rails); Fig. 19 is an enlarged detail E of Fig. 18;

Figures 20 and 21 representations corresponding to Figs. 18 and 19 in the

Intermediate position of the rails;

FIGS. 22 and 23 are views corresponding to FIGS. 18 and 19 in FIG

Extending the rails.

A first embodiment of the invention is shown in FIGS. 1 to 13. The pull-out guide is used to pull out a pull-out furniture part 1 from a furniture body 2 in a pull-out 50. The pull-out furniture part and the furniture body 2 are indicated only in Fig. 4 by dashed lines.

In the figures, the rails to be arranged on one side of the pull-out furniture part are shown. The rails to be arranged on the other side of the pull-out furniture part are mirror-inverted. The pull-out furniture part may in particular be a drawer. Other furniture parts which can be pulled out by means of a pull-out guide according to the invention can be, for example, boxes or trays.

The pull-out guide comprises a carcass rail 3 for attachment to the furniture carcass 2, a pull-out rail 5 for attachment to the pull-out furniture part 1 and a middle rail 4 arranged between the carcass rail 3 and pull-out rail 5.

The pullout guide is designed as Rollenausziehführung and the rollers for mutually displaceable guidance of the rails 3, 4, 5 are on the

Center rail 4 rotatably mounted.

On the center rail 4, a front roller 6 is rotatably mounted in the region of its (relative to the pull-out 50) front end, which cooperates with a downwardly oriented track 14 of the pull-5. The front roller 6 supports the pull-down rail down. A middle rail 4 is rotatably mounted in the region of its rear end, a rear roller 7, which is provided with a downwardly oriented track 12 of the

Carcass rail 3 interacts. The rear roller 7 supports the rear end of the middle rail 4 upwards.

In a central region of the center rail 4, a first differential roller 8 is rotatably mounted on the center rail 4. The longitudinal center axis of the first differential roller 8 preferably has a distance of less than one tenth of the length of the middle rail (= extension of the center rail in its longitudinal direction) from the Län gsmitte the center rail.

Behind the first differential roller 8, the center rail 4 a rotatably mounted two ite differential roller 9. The distance between the longitudinal center axis of the second differential roller 9 and the longitudinal center axis of the first differential roller 8 is preferably less than one sixth of the length of the center rail 4.

The first and second differential rollers have diameters differing less than 3% of the roller diameter, preferably the two rollers have the same diameter.

The first and second differential rollers 8, 9 cooperate with the upwardly directed track 13 of the carcass rail 3 and with a downwardly oriented track 14 of the pull-5. The first and second differential roller 9 are mounted with play against their bearing pins 16, 17, whereby they have a game in the vertical direction. The play in the vertical direction with respect to the center rail 4 is preferably more than 0.5 mm, and it may also be more than 1 mm.

Also, an axleless storage of the differential roller 8 and / or 9 on the center rail 4 with play in the vertical direction or storage (without play) on a

Axle, the opposite the center rail 4 with a game in vertical Ri ment is stored, is conceivable and possible.

Di e first and second differential role are compared to the center rail parallel to Ausiiehrichtung at least substantially (apart from the existing

La gerspiel) immovable.

In the area above the first differential roller 8, a pressure roller 10 is rotatably mounted on the center rail, which cooperates with an upwardly oriented track 15 of the pull-5. The pressure roller 10 serves to press the downwardly directed track 14 against the first differential roller 8 and the second differential roller. 9

The longitudinal center axis of the pressure roller 10 has favorably of the

Longitudinal axis of the first differential roller 8 a related to the withdrawal direction 50 distance of less than a sixth, preferably less than a tenth, the length of the center rail on.

Considering the extension position of the rails, the weight of the extendable furniture part acts on the pull-out rail 5 on the front roller 6, whereby a torque about an imaginary axis which passes through the rear roller 7 is applied to the center rail 4. Thus, the pressure roller 10 is pressed against the upward trajectory 15 of the pull-5.

The downwardly directed track 14 and the upward trajectory 15 of the pull-out rail 5 are formed in the embodiment of the top and bottom of a catwalk 18 of the pull-5. The catwalk 18 is thus clamped between the first differential roller 8 and / or second differential roller 9 and the pressure roller 10.

By the differential rollers 8, 9 of the differential (= synchronous) run the

Middle rail 4 causes when the pull-5 is pulled out. The IV! Ittelschiene 4 is in this case when pulling the pull-5 in the

Extraction direction 50 and when inserting the pull-out rail 5 counter to the withdrawal direction 50 are each moved by half the distance that the pull-out rail 5 snaps back.

Vo n the differential rollers 8, 9 in the course of extraction of the pull-out each load from the pull-5 is transmitted directly to the carcass rail 3 (but not from each of the differential rollers 8, 9 at each point of Ausziehweges, as will be explained below) ,

Preferably, also on the center rail 4, an auxiliary roller 1 1 with game

stored against its axis of rotation, in a lying between the second differential roller 9 and the rear end of the middle rail 4 range of countries gserstreckung the center rail 4. This Hi lfsrolle 1 1 can with the downwardly oriented track 14 of the pull-5 and the upward directed career 1 3 of the carcass rail cooperate to the rear end of the

Support the pull-out rail against tilting downwards (in the case of a far-back center of gravity for loading the pull-out furniture part). The maximum absorbed force is much lower than the

Differentia / ro // en 8, 9, so that the auxiliary roller can be designed accordingly cost-effective. Instead of the auxiliary roller 1 1 could in principle also be provided a slider.

The rollers 6-1 1 are in the embodiment of a continuous

Vertical web 27 of the middle rail 4 stored. Other trainings of the

Medium-weight rail is conceivable and possible, as is known from the prior art, for example from the documents cited at the outset.

The horizontal catwalk 1 8 of the pull-out rail is in Ausführungsbeispie! via a connecting web 20 (as shown may have a sloping and a verti l running portion or, for example, also can run vertically) with a horizontal support bar

ve rbunden on which the pull-out furniture part 1 rests. The support web 21 could also be omitted and the pull-out rail 5 could be connected via its connecting web 20 with the pull-out furniture part 1.

In the exemplary embodiment, the carcass rail 3 has a vertical base web 28, whose lower and upper edges are connected to horizontal webs 22, 23, which form the upward-pointing track 13 and the downward-pointing track 12 of the carcass rail 3. Preferably, the horizontal webs 22, 23 are provided to their free edges out towards each other Umbördelungen.

In the insertion position of the rails, the first and second differential rollers are preferably in the region 51 of a recess 24 of the upward track 13 of the carcass rail 3. By this recess 24, the maintenance of the insertion position of the rails can be ensured if the pull-out is not mounted exactly horizontal , Also, a certain recoil at the end of insertion of the pull-out furniture part can be added without causing an unwanted opening movement of the pull-out furniture part.

When the pull-out rail 5 is pulled out from the insertion position of the rails, the first and second differential rollers 8, 9 leave

successively the area 51 of the recess 24. This results in a certain increase in the front end of the middle rail and thus also the front end of the pull-5, i. the center rail 4 and pull-out rail 5 are slightly inclined. Such an increase of the front ends of the center rail and the pull-out rail, and thus the inclination of the

Middle rail and pull-out rail, when pulling out is reinforced by a sloping from back to front course of the downward career 12 of the rail 3.

The lifting of the front end of the pull-5 is dependent on the weight the extendable furniture part and its load but more or less compensated or even overcompensated by acting on the pull-5 rail weight. This weight force causes a certain bending of the rails and a certain compression of the rollers, in particular the first and second differential roller 8, 9. It must therefore not or only slightly raised in the fully loaded state of the pull-out furniture part during insertion.

The sloping from the rear to the front course of the downward career 12 can be formed by a correspondingly inclined course of the horizontal web 23.

The recess 24 could also be omitted and only a downward sloping from back to front course of the downward track 12 could be provided or falling from back to front course of the downward track 12 could be omitted and only one recess 24 could be provided.

When you pull the pull-out is achieved before the extended position of the rails, the intermediate position shown in Figs. 8-10 achieved. This is just the position at which the rear end of the downwardly oriented track 14 of the pull-out rail is located at the location of the longitudinal center axis of the second differential roller 9. Upon further extension, the downwardly directed track 14 of the pull-out rail 5 thus no longer interacts with the second differential roller 9. Upon further extension of the pull-out guide up to the pull-out position of the rails (cf., FIGS. 11-13), only the first differential roller 8 thus effects synchronous operation of the rails.

In the intermediate position of the rails shown in FIGS. 8-10, the second differential roller 9 is in the region 52 of a recess 25 of the upward

directed career 13 of the carcass rail 3. The first differential roller 9 is located in the intermediate position of the rails but not in the area 52 of the recess 25. If the pull-out thus starting from the extended position of

Reins is inserted again, the rear end of the downwardly directed track 14 of the pull-5 is running straight on the second differential roller 9, when the second differential roller 9 is in the region 52 of the recess 25. Without such a recess 25, it would, if the weight load on the pull-out rail is low and the inclination of the center rail and the pull-out rail is thus not compensated by the weight load, come to a stop of the rear end of the catwalk 18 against the second differential roller 9, which the user would be noticeable as a clear blow. By the

Recess 25, the second differential role 9 due to their vertical play in the region of the raceway 13, in which it comes to drive on the downward track 14 on the second differential role 9, something down, so that the blow when starting significantly reduced or

preferably not felt at all.

Over the short range of extraction and insertion, in which the second differential roller 9 is located in the region 52 of the recess 25, no load transfer from the pull-out rail to the carcass rail takes place from the second differential roller 9 and this is taken over by the first differential roller 8. Also, the synchronous running of the rails is ensured over this short distance alone from the first differential role 8.

When pulling out and pushing in the pull-out guide, the first one arrives

Differential roller 8 over a short portion of Ausziehweges in the region of the recess 25. About this short distance is transmitted from the first differential role 8 no load from the pull-5 to the carcass rail 3 and this is taken from the second differential role 9. Also, the synchronous running of the rails is ensured over this short distance solely by the second differential roller 9. The relation to the withdrawal direction 50 distance between the longitudinal center axis of the pressure roller 10 and the second differential roller 9 is sufficiently low, so that the pressing of the catwalk 18 to the second Differential roller 9 is ensured and the load acting on the pressure roller 10 loading is not too high.

In the extended position of the rails, when the downwardly oriented track 14 of the pull-out rail 5 is pulled off the second differential roller 9, can be described by the below-described embodiment of the storage of the second

Differential role 9 of the second differential role 9 nevertheless a bearing

Fun ction be adopted so that the first differential role 8 is relieved. If, in the extended position of the rails, the weight load acting on the pull-out rail 5 increases, the first differential roller 8 becomes increasingly larger

compressed, whereby the bearing pin 17 of the second differential roller 9 relative to the bearing bore of the second differential roller 9 moves increasingly downward. From a certain weight acting on the pull-5, the end of the bearing clearance of the second differential roller 9 is reached and the second differential roller 9 assumes an upper stop position of the bearing clearance, see. Fig. 12. In a further increase in the weight load of the pull-out 5 are thus not only the first from this weight load hereinafter

Differential roller 8 compressed but also the second differential roller 9 is compressed between the bearing pin 17 and the upward track 13. In such a further increase in the weight load of the pull-out rail 5 so that the load is transmitted via the second differential roller 9.

The length of the portion 52 of the recess 25 relative to the withdrawal direction is preferably smaller than the diameter of the first and second differential rollers 8, 9.

The maximum depth of the recess 25 is preferably greater than half

Bearing clearance of the first and second differential roller 8, 9. Also in the lower

Stop position of the first or second differential roller 8, 9, this is thus not in the region of the maximum depth of the recess 25 at the bottom of the recess 25 at. Above the first differential roller 8, more than one pressure roller could be arranged, for example, two rotatably mounted on a carrier about a horizontal axis mounted on the center rail 4 support rollers. A second pressure roller could also be arranged approximately vertically above the second differential roller 9.

The invention can also be used with pull-out guides with other rail profiles. Differential extracts with such other rail profiles, in which the invention can be used, for example, from the mentioned in the introduction of the prior art known. For example, the pull-out guide could be designed as a floor pull-out guide. In training as

Unterbodenausziehführung could also be present only a set of rails, especially in the training as a high cabinet drawer.

A second embodiment of the invention is shown in Figs. 14 to 22. Apart from the differences described below, the embodiment corresponds to that of the first embodiment and the description of the first embodiment and the possible modifications thereto

applicable accordingly.

The difference of the second embodiment from the first

Embodiment consists essentially in the fact that the recess 25 is omitted and for a survey 26 is available. In the intermediate position of the rails, the first differential roller 8 is located in the area 53 of this elevation 26, cf. Fig. 21. The second differential roller 9 is in the intermediate position of the rails but not in the area 53 of this survey 26. Preferably, the extends

Survey 26 so far towards the front end of the carcass rail 3, that in the extended position of the rails, the first differential role is still in the range of elevation 26 and now also the second differential roller 9 is in the region of the survey 26, see. Fig. 23. can also be the recess 25 of the first embodiment combined with the survey of the second embodiment.

Legend

to the reference numbers: pull-out furniture part 51 area

Furniture carcass 52 area

Carcass rail 53 area

middle rail

pull-out

front caster

rear caster

first differential role

second differential role

capstan

auxiliary role

downhill career

upward career

downhill career

upward career

pivot

catwalk

connecting web

support web

horizontal web

deepening

survey

vertical web

base web

pull-out

Claims

Pull-out guide for extracting a pull-out Möbelteiis (1) from the

Furniture carcass (2) in a pull-out direction (50), comprising a carcass rail (3) for attachment to the furniture body (2), a pull-out rail (5) for

Attachment to the extendable furniture part (1) and one between the

Middle rail (4), which has a first and a second rotatably mounted differential roller (8, 9), each with respect to the central rail (4) has a bearing clearance in the vertical direction and of which the second differential roller (9) relative to the withdrawal direction (50) behind the first differential roller (8) is arranged, wherein the first and second differential roller (8, 9) with an upwardly directed track (13) of the carcass rail (3) and after downwardly oriented track (14) of the pull-out rail (5) cooperate and the first differential roller (8) when pulling out the pull-out guide from an insertion position of the rails, in which the pull-out guide is fully collapsed, to a pulled-out position of the rails, in which the pull-out guide completely is pulled apart between the upwardly directed track (13) of the carcass rail (3) and the downward Lau Fahnen (14) of the pull-out rail (5) and the second differential roller (9) when pulling the pull-out from the insertion position of the rails to an intermediate position of the rails between the upward track (13) of the carcass rail (3) and after downwardly oriented track (14) of the pull-out rail (5) and the further extension of the pull-out from the intermediate position relative to the pull-out direction (50) rear end of the down

directed career (14) of the pull-out rail (5) in front of the second

Differential roller (9), characterized in that the second differential roller (9) in the intermediate position of the rails in the region (52) of a Depression (25) of the upwardly directed track (1 3) of the carcass rail (3) and / or the first differential roller (8) in the intermediate position of the rails in the region (53) of an elevation (26) of the upward track (FIG. 1 3) of the carcass rail (3) is located.

2. pull-out according to claim 1, characterized in that the pull-on direction (50) related distance between the longitudinal center axis of the second differential roller (9) and the Längsm / ttelachse the first

Differential Rol (8) is less than one sixth of the length of the middle rail.

3. Pull-out according to claim 1 or 2, characterized in that the distance between the longitudinal center axis of the first differential roller (8) of the

The longitudinal center of the middle rail (4) is less than one tenth of the length of the

Central rail amounts to.

4. Pull-out according to one of claims 1 to 3, characterized in that in the area above the first differential roller (8) a pressure roller (10) a is arranged, with an upwardly directed track (1 5) of the

Extending rail (5) cooperates.

5. Pull-out according to claim 4, characterized in that the pull-on direction (50) related distance between the longitudinal center axis of the pressure roller (10) and the longitudinal center axis of the first differential roller (8) is less than one sixth of the length of the M ittelschiene (4) ,

6. Ausziehfüh tion according to claim 4 or 5, characterized in that the pull-out rail has a catwalk (18), the underside of the downwardly directed track (14) of the pull-out rail (5) and the upper side of the upwardly directed track (15) Extending rail (5) forms.

7. Pull-out guide according to one of claims 1 to 6, characterized in that in the region of the pull-out direction (50) rear end of the middle rail (4) has a rear roller (7) is rotatably mounted, which with a downward career ( 12) of the carcass rail (3) cooperates.

8. Pull-out guide according to claim 7, characterized in that the downwardly directed track (12) of the carcass rail (3) extends at least over a part of the length of the carcass rail (3) sloping from back to front.

9. Pull-out guide according to one of claims 1 to 8, characterized in that in the region of the pull-out direction (50) front end of the middle rail (4) has a front roller (6) is rotatably mounted with the downwardly directed track ( 14) of the pull-out rail (5) cooperates.

10. Pull-out guide according to one of claims 1 to 9, characterized in that at a centrally acting load of the pull-out rail (5) with a weight which is at least 50% of the test load, the second

Differential roller (9) occupies an upper stop position with respect to their bearing clearance in the vertical direction.