DE2946113A1 - Extension fitment allowing full use of drawer - has support lever and roller to fully extend drawer support rails - Google Patents

Abstract

The drawer guide includes an L-shaped section extension rail either side of the drawer and a U-section rail either side of the frame wherein either the rear end of the two extension rails (7) or the front end of the two frame rails. These are each fitted with a support lever (12) and support roller (14) which with the drawer pushed in is swivelled from a rest position in which it is set in a plane parallel with the front of the drawer into a work position as the drawer is pulled out where it extends the relevant rail allowing the drawer to be fully extended without complicated and expensive measures such as a third rail. The additional space required for the support levers is minimal since in the rest position they lie at right angles to the pairs of rails.

Description

PATENT LAWYERS
Dlpl.lng. P. WIRTH Dr. V. SCHMIED-KOWARZIK

Dlpi.mg. G. DANNENBERG Dr. P. WEINHOLD Dr. D. GUDEL Dipl.-Ing. S. Schubert

GR. ESCHENHEIMER STR. 39

TELEPHONE: (0Θ1Ι)

281134 2870M

6000 FRANKFURT AM MAIN 1

November 4, 1979 Gu / pi.

Erich Löhnert

Intoxicated 1

6483 Bad Soden-Salmünster

Pull-out cover for a drawer,

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29A6113

The invention relates to a pull-out fitting for a drawer with one on each side of the drawer frame attached pull-out rail with L-profile and one on each side of the body Carcase rail with U-profile, which work together in pairs, the pull-out movement in each case by a pull-out roller attached to the pull-out rail and one on the Body rail attached body roll is made possible, which is on the horizontal splash of the respective other rail of the pair of rails.

With such a known pull-out fitting, only a so-called partial pull-out, also 4/5 pull-out, can be made called, achieve. This means that the drawer in question is only pulled out of the body by about 4/5 of its length can be. A full extension or even over extension is possible when using the two pairs of rails mentioned (pair of cabinet rails and pull-out rail pair) not possible.

If you want to achieve full extension or over extension, with the so the drawer can be pulled out of the body so far that its rear wall with the front of the body is in line or in front of the body, so far you have to rely on a so-called 3-rail pull-out So a total of 3 pairs of rails work together. Included but not only doubles compared to a partial extension the cost of rollers or ball cages, but there is also a double game. You also need a third pair of rails.

If you want to avoid this structurally complex route, you also shorten the length of the prior art

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Drawer, whereby the required space between the Drawer rear and the carcass rear wall is obtained. This solution comes with the creation of a dead one Space that is lost for the actual drawer. This solution is therefore also disadvantageous.

The invention avoids these disadvantages. It is based on the task of a pull-out fitting of the type mentioned at the beginning Kind of propose with which with only little additional constructive effort and practically without loss of space it it is possible to achieve full extension or over extension.

To solve this problem, the invention is characterized in that that at the rear end of both pull-out rails or at the front end of both cabinet rails one each Support lever is attached with a support roller, which when the drawer is pushed in from a rest position in which it is in a plane parallel to the front of the drawer, when the drawer is pulled out via a guide can be pivoted into a working position in which it extends the relevant pull-out rail or body rail.

In the working position, the pair of supporting levers is thus in the horizontal pivoted and thereby either extended the pair of pull-out rails or the pair of cabinet rails. This extension results in the desired full or over-extension achieved. The additional space requirement for the pair of support levers is minimal, because the support levers in the rest position in one Position are pivoted perpendicular to the rail pairs.

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There are several for the pivoting movement of the pair of support levers Possibilities that can all be realized according to the principle mentioned. If the support levers are attached to the rear ends of the pull-out rails are attached, they are either in a vertical plane or upwards pivoted down. In general, it is advisable to pivot upwards, because then the support levers on the rear wall your drawer. Especially if it is the bottom drawer of a piece of furniture, however, pivoting downwards can also be considered, because then the full height of the base can be used for the length of the support lever, which is usually the height of the drawer exceeds. With support levers attached to the rear ends of the pull-out rails, however, these can also be swiveled inwards in the horizontal plane to rest against the rear wall of the drawer.

Are the support levers at the front ends of the cabinet rails hinged, they can in a similar manner in the horizontal plane inward or in the vertical plane be swiveled up or down.

It is used to simplify the design of the guide if a guide pin sits on the support roller and is inserted into a Guide groove engages in a guide part.

The above-mentioned over-extension can be constructed in the simplest way reach when the support lever has an upstand that is in the horizontal working position of the support lever the horizontal flange of the rail on which the relevant body roll rolls. The upstand of the The support lever thus serves as an extension of the relevant horizontal flange of the rail.

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During this over-extension, the extension roller runs out of the running surface the cabinet rail. In order to prevent the increased load on the body roll caused by this, it is preferred if an auxiliary roller is attached to the support lever between its pivot axis and the support roller, which on rolls off the horizontal flange of the pull-out rail. The load is thus of the role of help in the over-extension state recorded.

An alternative solution for over-extension provides that there is an additional one at the front end of the cabinet rail Auxiliary support lever is attached, which is in the working position the lower running surface of the cabinet rail is extended. In this case, the pull-out roller does not run even with the over-extension path out of their career.

This results in a particularly stable lateral guidance without influencing tolerances between the clear body width and width of the drawer when the pullout rollers are rotatably connected to one another by a rod and a frictional or tooth-locking connection to yours Have tread. The tooth-locking connection can be brought about by several frontal extensions on the rollers, which mesh with serrations on the rails.

The frictional connection has the additional advantage of running quietly.

This is preferably achieved by means of adhesive rubber rings which, in a further embodiment of the invention, are narrower than the width of the rolls and those in circumferential grooves

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are used on the rollers. When the drawer is heavily loaded, the actual load transfer takes place directly between the rollers and the rails (steel on steel) so that the adhesive rubber rings are not overstressed will.

An important embodiment of the invention is characterized in that that the pull-out roller on the lower horizontal flange and the support roller on the upper horizontal flange Unrolls the flange of the relevant cabinet rail. This results in constant guidance of the pull-out roller at the bottom Legs of the cabinet rail over the entire pull-out path, thereby tilting and thus lowering the drawer halfway through the extension path, as is the case with the prior art is reduced to a minimum. The roller axis of the pull-out roller is only one-sided, and not reciprocally, burdened. Furthermore, this also results in constant guidance of the support roller on the upper leg the cabinet rail over the entire pull-out path with the same advantages as mentioned above.

These measures also relieve the body roll in the front half of the pull-out path due to the pull-out roller, which is loaded in the same direction, which makes the body roller compared to conventional roller pull-outs only has to absorb about half of the maximum load. This also applies to the over-extension with the mentioned auxiliary role.

With full extension, it is preferred to simplify the design if the pivot axis of the support lever in the The axis of rotation of the pullout roller lies.

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- ίο -

If an inlet is desired, it can advantageously be attached to the guide for the pull-out roller or be designed for the support roller.

The invention is explained in more detail below with the aid of exemplary embodiments, from which further important ones emerge Features result. It shows:

Flg. 1 shows in a schematic side view a possibility for the arrangement of the pivotable Support lever;

Fig. 2 in a schematic plan view of a second possibility for the arrangement of the pivotable Support lever;

Fig. 3 in a schematic plan view of a third possibility for the arrangement of the pivotable Support lever;

Flg. A a fourth in a schematic side view Possibility for the arrangement of the pivoting support lever;

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5 shows, in perspective, an embodiment of a carcass rail;

6 shows, in perspective, an embodiment of a pull-out rail with support lever and connecting axis;

7 to 12 each one above the other in a side view

(Fig. 7 »9 and 11) or in a plan view (Fig. 8, 10 and 12) the drawer in the inserted State (Fig. 7 and 8), partially pulled out (Fig. 9 and 10) or fully pulled out (Figures 11 and 12);

13 to 15 schematically in side views the loads on the rollers in the pushed-in state of the drawer (Fig. 13) »with the drawer half pulled out (Fig. 14) and with the Completely pulled out drawer (Fig. 15);

Fig. 16 plotted over the pull-out path of the drawer

the load on the individual roles in the new pull-out fitting, compared with the state of the Technology;

17 shows a side view of a modification of the

Extension fitting with bevelling of the support lever for over-extension;

18 shows a view similar to FIG. 17 in a modified embodiment with a bevel of the support lever and FIG Auxiliary role;

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First, the principle of the novel pull-out fitting will be explained with reference to FIGS. 1 to h . In these figures, a body with a front wall 31 and a rear wall 32 is indicated. A drawer 33 is displaceable in the direction of the double arrow 34. Support levers can move towards
the double arrows 35 are pivoted. The pivot axis of the support levers is indicated at item 36 in each case. In the embodiments according to FIGS. 1 and 2, the support levers are
attached to the rear ends of the pull-out rails. In the embodiments according to FIGS. 3 and 4, they are on
attached to the front ends of the cabinet rails.

In the embodiment according to FIG. 1, the support levers are folded vertically upwards. Accordingly can they can also be folded down.

In the embodiment according to FIG. 2, the support levers folded inwards horizontally.

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In the embodiment according to FIG. 3, the support levers also folded inwards horizontally.

In the embodiment of FIG. 4, the support levers Folded up or down vertically.

A body rail 1 (see. Fig. 5) consists of a U-profile as with other roller extensions. The upper leg gets an upstand 2 at the front, on which a body roll 3 is rotatably mounted. She's in the back of one Guide part 4 cut off. This guide part includes a quarter-circle groove 5 in which a pin 15 is a Support roller 14 is carried up and down (see. Fig. 6). A bend 6 is used for the smooth entry of the support roller 14.

There is a pull-out rail 7 (wing 6), as is also the case with Roller extensions Usually, from a Z-profile. At the far end there is a cutout, next to which a nose 9 is arranged. A hole 10 at the rear serves as a support lever and as pull-out roller bearings. A support lever 12 is independent of one another with a pull-out roller 11 in the pull-out rail 7 rotatably fixed. The support lever has an approach with stop 13, which is in the horizontal position of the Support lever hits the nose 9 of the pull-out rail. At the upper end of the support lever 12 in the vertical position sits the support roller 14, the axis of which as a guide pin protrudes forward and the lowering and lifting of the support lever within the range of the guide part 4 through the groove 5 causes.

The pull-out roller 11, like the other rollers, is provided with a groove running all around, in which an adhesive rubber ring

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16 lies.

A connecting axis 17 is in the axis of the extraction roller 11 and connects it to the corresponding pull-out roller on the other side of the drawer.

The support lever 12 has one in the axis in the drawing not visible ring-shaped approach as a pivot bearing in the pull-out rail 7, in order to avoid that in loaded, In the horizontal position of the support lever, the pull-out roller axis is subjected to shear and the roller is thereby inhibited.

When the drawer is closed, it closes at the front the body rail 1 and the pull-out rail 7 with one another away. The upper leg of the pull-out rail rests on the front the body roll 3 on which the Z-rail over their entire pull-out path (see. Fig. 7, β) rolls. The pull-out rail 7 - and thus the drawer - sits with its pull-out roller 11 on the lower leg of the cabinet rail 1, on which it also moves along the entire pull-out path of the drawer 18. The support lever is vertical, it lies in the center of the punching β of the pull-out rail 7. The guide pin 15 of the support roller 14 lies in the uppermost position in the groove 5 of the guide part 4.

If the drawer is now pulled out (FIGS. 9, 10), the pull-out rail 7 moves with the drawer 18 forward and the support lever 12 slides, guided by the guide pin 15 in the groove 5 of the guide part 4, to the rear below.

On the further extension path of the drawer to the front, the guide pin 15 now leaves the area of the guide part 4

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or its groove 5, at the same time the support roller i4 slides under the upstand 6 of the upper leg of the cabinet rail 1.

Pull-out roller 11 and support roller 14 are arranged by means of the support lever 12 so that when the support lever is lying horizontally 12, the pull-out roller 11 rests on the lower leg, the support roller 14 on the upper leg of the body rail 1 in a non-positive manner. The adhesive rubber rings 16 are the same as the rollers 3, 11 and 14 manufacturing tolerances. This is approximately in the middle of the pull-out path of the drawer with the upper one Legs of the Z-profile 7 on the body roll 3 in the balance. With conventional pull-outs, the drawer tilts because it was previously on the lower leg the body rail moving role of the pull-out rail as a result of the shift of the center of gravity of the drawer from the Position behind the body roll is moved into the position in front of this, with the pull-out roll at the same time its direction of rotation reverses.

This phenomenon of tipping the drawer - and with it the Lowering - does not occur with the new type of fitting because the pull-out roller is always on the lower, the support roller, on the other hand, is always on the upper leg of the cabinet rail U-profile as soon as the support roller has moved into the cabinet rail. See also Figs. 13-15, in which shows the load distribution on the rollers at load "1".

In FIG. 16, the different roller loads in conventional pull-outs are compared with the new pull-out type. It is shown that for the most heavily used body role in the novelty compared to conventional Extracts reduce the burden on those

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Half results. Provided that the distance between the support and pull-out rollers and the depth of the drawer is 1: 4 (corresponds to the conventional 4/5 pull-out and therefore the usual conditions), the result is the significantly lower one Roller load of the novelty compared to previous drawer runners despite the elimination of the drawer loss.

The support lever 12 has a stop 13 which extends so far protrudes that it could touch the upper leg of the body rail 1 or the upstand 6. This is why the guide part 4 is kept correspondingly wide.

Now let's look at the front half of the drawer pull-out path, as shown - in the end stop - in FIGS. 11, 12 is. The support lever 12 is horizontal, the pull-out roller is practically under the body roller. The attack 13 rests on the nose 9 of the pull-out rail, and the body roll 3 rests against it. The drawer is fully extended.

To remove the drawer from the body, lift it so that the nose 9 and the stop 13 over the body roll 3 can be lifted, the support lever - due to its weight - remains in its horizontal position.

When the drawer is pushed in, the above play out Operations in reverse order. As soon as the guide pin 15 is in the groove 5 of the guide position 4 comes, there is little resistance when pushing in the drawer, because then the support lever is up must be lifted. In the illustrated version of the support lever - assuming all parts are made of steel -

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a weight behind the pivot point of only about 45 g.

It is often desired that the pull-out guide have a so-called Receives inlet, which causes the drawer to remain in the pushed-in position even when the body stands leaning forward. Such an inlet can be injected for the pull-out roller as well as for the support roller are provided on the guide part 4.

The big disadvantage of the roller puller compared to the ball rail puller is its very low lateral stability so far. It arises from the fact that the roles on the Running surfaces must have lateral play, and when pulling out the drawer and thus decreasing The distance between the body and pull-out roller thus results in an increasingly unfavorable lever ratio and thus an ever bigger game.

The situation with the ball rail pull-out is conditionally better in terms of the system: Here is the pull-out rail with the cabinet rail exactly connected in the area of the ball cage. However, the bending stiffness of the pull-out rail is in this case Because of its width-to-height ratio, the system is much smaller at the sides than at the bottom. This fact is exploited here, To compensate for tolerances between the width of the drawer and the clear width of the cabinet: The pull-out rail opens to the side after. As an - undesirable - side effect, however, results from the fact that (especially with wide drawers) the Rarely move the ball cages of the two pull-out guides against each other can, and thus the lateral stability is also reduced.

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The novelty avoids all such disadvantages, and also the tolerance difficulties between drawer widths clear body width:

- In the case of ball rail pull-outs, where there is a rigid connection in the area of the ball cage, as already described must exist between the cabinet and pull-out rails

- either give way to the side of the pull-out rail, or

- The attachment of the drawer in the pull-out rail take up tolerances.

- In the case of roller pull-outs, the raceways including the rollers can be deformed accordingly for a forced Oeradlauf. At least one-sided (right or left) play would then have to be available to compensate for the width tolerance (which is different Rail shapes right and left would result, or an adjustment option with effort and longer assembly time requires), but then you still have the disadvantage that when you pull out the drawer the distance between the rollers is reduced and the lever ratio becomes increasingly unfavorable.

In order to achieve exact lateral stability consistently over the entire extension path, it is therefore necessary to to connect two identical roles on both sides of the fitting for forced synchronous operation.

The solution is technically flawless, the synchronization through a gear / rack and pinion system - for example through a rack and pinion gearing - to guarantee. However, this option appears to be complex, which is why with the help of adhesive rubber rings all roles the adhesion between role and track of the rails is increased, with a plug-in axle 17 the Connection between right and left guide is established.

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When tested by a model, it was found that all rollers should contribute to lateral stability, if a gearwheel / rack and pinion forcing is not used. You can also achieve a particularly noiseless one Running of the rails when all rollers have adhesive rubber rings.

In addition, the result is that the straight line is all the more The more the load is placed on the drawer, the better it is.

The adhesive rubber ring of the rollers is much narrower than the width of the roller running surface and the raceways. Through this will

- the rubber is not overstressed under heavy loads,

- the drawer is guided exactly horizontally because metal is on Metal rolls.

So far, full extensions have mainly been used in the office furniture industry used with a load capacity of the pull-out runners from 40 to kg; here determine the paper dimensions (DIN A 4 and DIN A 5) the drawer dimensions. Now the purpose of use requires that this extremely exaggerated is necessary, because the drawers are not only up to the front edge of the carcass but also above the front pieces Drawers have to be pulled out, because yes with card extracts the rearmost card index card must also be easily accessible. Since the leverage ratios badly deteriorate, also on the shift in the center of gravity in the case of the body with heavily loaded, fully extended Drawers must be taken into account (the body must not tilt), is currently an over-extension dimension of 25 mm is common.

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Fortunately, there are drawer heights of more than 210 mm (DIN A4 horizontal) available for card files, which is why is important because the length of the support lever (which is vertical in the rear position) depends on the height of the drawer is dependent. (In any case, not only with over-extension, it is advisable to use the length of the support lever of the drawer height adapt).

In order to achieve an over-extension, the track of the Auezueschiene must 7 can be extended to the rear, see Fig. 17. This is done by turning the support lever 12 accordingly folded so that this fold 20 with the support lever lying horizontally with the track of the pull-out rail 7 is aligned and extended to such an extent that an over-extension of e.g. the usual 25 mm results.

The simple full extension guide at the rear end of the Extension bar 7 seated nose 9 and the punching θ not applicable. The nose 9 is moved to the end of the fold 20 of the support lever. It is also useful to have the pivot point of the support lever 12 not to be placed in the axis of the pull-out roller 11, but to be arranged above it, in order to increase the leverage to make cheaper within the support lever. Finally, there is also a stop 21 for the support lever to be provided. A second stop at a greater distance from the pivot point can also be useful for heavy loads be (not shown).

On the over-extension path in the embodiment according to FIG. 17, the extension roller 11 runs out of the running surface of the body rail 1 out. As a result, the body roll, previously based on the

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pull roller supported (see curves Fig. 16), now with loaded twice the force. An embodiment according to Fig. 18 avoids this disadvantage. A fourth roller is required, which is referred to as auxiliary roller 22 and sits on the support lever. For this, the pull-out roller 11 is set forward so far, that it does not hinder the rotation of the support lever 12.

It is also possible to have a second support lever attached to the front of the cabinet rail, the lower running surface of the To extend the cabinet rail. Even then, the pull-out roller does not run out of the track on the over-extension path.

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Claims (12)

2 9 A 6 11 Patent claims or protection claims: Pull-out fitting for a drawer with one attached to both sides of the drawer frame Pull-out rail with L-profile and one on each Side of the body attached body rail with U-profile, which work together in pairs, with the pull-out movement in each case by a pull-out roller attached to the pull-out rail and one on the body rail attached body roll is made possible, which is on the horizontal flanges of each other Unroll the rail of the pair of rails, characterized in that at the rear end of both pull-out rails (7) or a support lever (12) with a support roller (14) is attached to the front end of both cabinet rails (1) is that when the drawer (33) is pushed in from a rest position in which it is in a plane parallel to the front (31) of the drawer, when the drawer is pulled out over a Guide (5 »15) can be moved into a working position, in which he extends the relevant pull-out rail or cabinet rail. 2. Pull-out fitting according to claim 1, characterized in that the support lever (12) at the rear end of the Pull-out rails (7) pivotable in a vertical plane are appropriate. 130021/051 1 ORIGINAL INSPECTED ir- 2- 3. Pull-out fitting according to claim 1 or claim 2, characterized in that that on the support roller (14) a guide pin (15) sits, which engages in a guide groove (5) in a guide part (4). 4. pull-out fitting according to claim 1 to claim 3, characterized in that that the support lever (12) has an upstand (20), which in the horizontal working position of the support lever extends the horizontal flange of that rail » on which the roll in question unrolls. 5. Pull-out fitting according to claim 4, characterized in that that an auxiliary roller (22) is attached to the support lever (12) between its pivot axis and the support roller (14) that rolls on the horizontal flange of the pull-out rail (7). 6. pull-out cover according to claim 2 to claim 4, characterized in that that an auxiliary support lever is also attached to the front end of the cabinet rail (1), which is in the Working position, the lower running surface of the cabinet rail is extended. 7. Pull-out fitting according to claim 1 to claim 6, characterized in that that the pullout rollers (11) are non-rotatably connected to one another by a rod (17) and a frictionally engaged one or have a toothed connection to their running surface. 130021/051 1 8. Pull-out fitting according to one of claims 1-7, characterized in that that on all rollers (3, 11, 14, 22) adhesive rubber tape (16) are postponed, 9. Pull-out fitting according to claim 8, characterized in that that the adhesive rubber rings (16) are narrower than the width of the rollers and in circumferential grooves on the rollers are used. 10. Pull-out fitting according to claim 1 to claim 9, characterized et, that the pull-out roller (11) on the lower horizontal flange and the support roller (14) on the upper horizontal flange Unrolls the flange of the relevant cabinet rail (1). 11. Pull-out fitting according to one of claims 1 to 3 »claim 7 to claim 10, characterized in that the pivot axis of the support lever (12) is in the axis of rotation the pull-out roller (11) is located. 12. Pull-out fitting according to claim 1 to claim 11, characterized in that that on the guide (4) there is an inlet for the pull roller or is designed for the support roller. The patent attorney Dr. D. Gudel 130021/0511