DE7714976U1 - DOUBLE EXTENSION DEVICE FOR GUIDING EXTENDABLE PARTS LIKE DRAWERS - Google Patents

Description

DH.-ING. DtPL.-ING. M. SC. DIP lJ-P ξΐγ $., Of ».

HÖGER - LEGAL LAW - GRIESSBAC

PATENT LAWYERS IN STUTTGART

A 42 333 b

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May 9, 1977 _ ₆ -

Schock & Co. GmbH
Gmünder Str. 65

7o6o Schorndorf

The invention relates to a double pull-out device for lateral rectilinear guidance of a reciprocable part, for example a drawer, with an outer ?, a middle and an inner guide rail, which are telescopically slidable in one another on roller bodies and of which the outer or the inner guide rail is held on a carrier and the displaceable guide rails in their maximum extension position are fixed by a stop.

Double pull-out devices of the type described above make it possible, as is known, to drawers or the like parts over them pull out the entire length of the housing receiving them.

The sliding guide rails are guided freely back and forth in one another, e.g. when pulling out of drawers usually has the consequence that the guide rail carrying the load or the drawer first moves outwards is moved. As soon as it then reaches its end-of-extension position, which is fixed by a stop, further pulling is inevitable the middle guide rail taken in its maximum extended position. When the drawers are pushed in, it takes place the movement of the guide rails in reverse order, namely so that the middle guide rail is initially in moved back to its original position before the drawer moved

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sets the supporting guide rail in motion.

The following disadvantage results from the sequence of rail movements taking place in the manner described: If, for example If a drawer is pulled out of a furniture body, the guide rail that carries it forms when it is fully pulled out State of a load arm protruding from the middle guide rail. If the contents of the drawer are relatively heavy this means that when pulling out the middle guide rail, the guide surfaces leading to it on this and on the stationary guide rail by the rolling elements rolling on this, due to the resulting from the load arm Load moments are subject to a very large dynamic load when the middle guide rail is pulled out because of the while the load arm continues to lengthen, up to a maximum level constantly increasing. As a result, the profiles of stationary and middle guide rails must be dimensioned so that their running surfaces also under extreme load conditions are able to withstand the enormous friction or surface pressure resulting from this over long periods of time.

It is therefore the object of the invention to provide a double pull-out device of the type described at the beginning, when the movable guide rails are extended under load conditions the guide surfaces of the central guide rail only in the initial phase or in the final phase of the movement when moving in # a dynamic one and for the remaining part of the displacement path, at which the load torque increases to its maximum value, are only subject to a static load.

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This object is achieved by the features specified in claim 1.

Due to the movement sequence of the displaceable guide rails established according to the invention, it is ensured that the dynamic loading of the guide surfaces for the middle guide rail only lasts until it is in its extended position is brought. Over this sub-range of the displacement path of the load, the load torque increases to the extent that which does not yet have a detrimental effect on the guide surfaces able. The subsequent shifting of the load-bearing guide rail into its extended position is then only with an increase in the static load of those taking over the leadership of the middle guide rail Guide surfaces connected, which can therefore in no way have a detrimental effect on the quality of the guide surfaces, because the rolling elements are at a standstill. The invention thus offers the essential advantage that, due to the achieved significant reduction in dynamic load, either the profiles of the guide rails less strong dimensioned or such double pull-out devices can be subjected to significantly higher loads or have a longer service life

The compulsory sequence of the movable ones provided according to the invention Guide rails can be advantageously implemented in all known double pull-out devices, the guide rails can be roller or ball bearings. In addition, it is irrelevant whether the outer or the inner guide rail bears the burden.

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It is advantageous to stop the rail guide Controlled in each direction by a locking mechanism.

These locking mechanisms controlling the forced sequence can be effective all or only in part in a direction transverse to the longitudinal direction of the guide rails or exclusively in the longitudinal direction of the guide rails. Here, it is gün- \ stig, wenn.mindestens that is both slidable guidance f seemed to each other defining locking mechanism as Grenzkraftgesperre formed, wherein the formation thereof can take many forms .. For example, it is possible, on the provide a spring lever comprises a displaceable guide rail, by interacting with a corresponding projection on the other guide rail, the guide rail carrying the load is fixed in the middle guide rail until it has reached its maximum extended position. However, it is also possible to provide a rotatable roller on one guide rail, for example, which engages behind a projection formed on the other guide rail, in which case hard-elastic material should be used for the roller. It is also possible to provide a corresponding stopper made of hard rubber, which interacts in a frictionally locking manner with a corresponding mating member. Preferably, however, a locking lock is used as the limit force lock, with the locking parts forming the same advantageously being arranged in the area of the front end of the displaceable guide rail. In a preferred embodiment, the counter-locking element of this locking mechanism receiving the locking element is fork-like, and its resilient fork legs are adjoined by a locking recess, the width of which is somewhat larger than the mutual spacing of the fork legs

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is, so that the locking member in this locking recess essentially can snap in positively. Such a locking mechanism, which is effective in the longitudinal direction of the guide rails, offers apart from a reliably effective, but easily resolvable counter-f lateral locking of the guide rails to be displaced with one another has the further significant advantage that in locked State of the guide rails the load-bearing guide rail in the middle guide rail at its front end is perfectly stabilized in height relative to the latter, from which a relief of the leadership of this guide rail re-

sulted. The locking parts creating the height stabilization can either use the overlapping Flat sides of the two displaceable guide rails or on a pair of the adjacent longitudinal edge parts thereof be arranged.

That the middle guide rail in its maximum drawn position on the stationary guide rail locking lock can be designed such that it is through the Load-bearing guide rail is controllable so that it releases the middle guide rail as soon as the load-bearing Guide rail is essentially pushed back into its intermediate division. A pawl, for example, can be used for this purpose be provided, which can be controlled accordingly by the guide rail carrying the load. But it can be just as beneficial a locking mechanism can be provided, the sliding guide rails of which in the case of double pull-out devices are each guided displaceably by means of a ball cage, the particular advantage that the ball cage provided that it is U-shaped in cross section and the

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middle guide rail engages over on a flat side, can form part of this Rastgesper'res by, for example in the ball cage a locking recess accessible from one end of the same is provided and the one that interacts with this Locking member is arranged on the stationary guide rail.

Further features and details of the invention can be found in the subsequent description of shown in the drawing Embodiments of the double pull-out devices according to the invention and / or can be found in the claims. In the drawing show:

Fig.! a side view of a first embodiment a dcjipel pull-out device, the guide rails of which are pushed together,

2 shows a shortened side view of the device according to Fig.l, wherein the middle guide rail is set in its maximum extended position,

3 shows an abbreviated side view of the device according to Fig.l and 2, wherein the load-bearing guide rail is in its Ausziehfendstellung is located

4 a partial section along the line 4-4 of Fig. 1, on a larger scale than this,

5 shows a cross section through the device the line 5-5 of Fig. 1, on a larger scale than this,

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6 shows a side view of a second embodiment of a double pull-out device in the collapsed state, shown in abbreviated form;

7 shows a side view of the device according to FIG their maximum extended position is set '.st,

FIG. 8 shows an abbreviated side view of the device according to FIG. 6, with the load load-bearing guide rail is in its extended position,

9 shows a cross section through the device the line 9-9 of Fig. 6, on a larger scale than this,

Fig.Io a side view of a third embodiment of a double pull-out device in a shortened form Representation of which the guide rails are pushed together,

11 shows a side view of the device according to Fig.Io, shown abbreviated, with its middle guide rail is set to its maximum extended position,

FIG. 12 a side view of the device according to FIG. in which the guide rail carrying the load is also in its extension part,

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13 shows a diagram for a comparative consideration of the
Load condition in a known double pull-out device and in a double pull-out device according to the invention.

In all shown exemplary embodiments of double extracts

devices denotes 20 an outer guide rail, 22 f ^;

a middle guide rail and 24 an inner guide ί

Rail, which is held by means of, for example, ball cages 26 and 28 |

Balls are slidably mounted in one another. The training \

the guide rails as such is known and forms I.

not part of the invention. I.

As FIG. 5 shows, the outer guide rail has a | T-shaped cross-section, the legs 32, 34 of which at the I.

I have a concavely curved ball running surface 36 on the inside, the middle guide rail 22 likewise has a T-shaped cross-sectional shape and its legs 38, 40 are thus folded and deformed so that they have opposing ball race % surfaces 42,44. The inner guide rail 24 has
inverted C-shaped profile cross-section, whose legs
have outer ball bearing surfaces 46 which are symmetrical with respect to the ball bearing surfaces 44. The balls 30 of the ball cages 26, 28 are guided between the adjacent knuckle running surfaces.

It is assumed that the outer guide rail 20 is mounted within a piece of furniture 48 indicated by dash-dotted lines
and that the inner guide rail 24 carries the load
j guide rail forms in which, for example, a

j drawer 50 indicated by dash-dotted lines is attached.

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May 9, 1977 - May 14

This double pull-out device is equipped with two locking mechanisms, designated as a whole with 52 and 54, through which the Moving the guide rails 22, 24 a forced sequence is achieved in the sequence of movements. This is what the both locking mechanisms in the longitudinal direction or in the direction of displacement of the guide rails, the locking mechanism 52 being the inner guide rail 24 defines relative to the middle guide rail 22, while the locking mechanism 54 in the direction of insertion the middle Guide rail 22 is fixed relative to the outer stationary guide rail 20 until the inner guide rail is pushed back into the middle guide rail.

The locking mechanism 52 preferably acts as a locking mechanism Limit force lock. The same is by one at the front end the middle guide rail 22 fastened locking member formed for example in the form of a circular cylindrical pin, which is assigned a counter-locking element 60 on the opposite side of the wall part of the inner guide rail 24 is, which is fork-like and whose fork legs 62, 64 bend apart resiliently elastically to the side are. A latching recess 66 adjoins this fork leg, into which the latching member 56 essentially able to engage positively if it has previously been moved through between the two fork legs 62, 64 is. (See Figure 4).

The locking mechanism 54, on the other hand, has a pawl 70 which can be pivoted about a pivot axis 68 and which moves under the action their center of gravity automatically pivoted into their stop position shown in Figure 3. The stop 70 'of this pawl is on the inside of the stationary outer rail 20

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a stop pin 72 is assigned to which the stop pawl comes to rest in its stop position when the middle guide rail 22 is moved into the outer guide rail 20. The inner guide rail 24 here forms a control member in order to pivot the locking pawl , which is linked to the central guide rail, back into its release position according to FIGS. The components of the locking mechanism 52, 54 could also be arranged on the respective other guide rail.

To explain the sequence of movements of the movable guide rails Assume that the drawer 50 is inside the cabinet 48 and is about to be pulled out. In the inserted position corresponds to the relative position of the guide rails of the illustration according to Figure 1. From this It can be seen that the middle and inner guide rails are locked to one another by means of the locking sprue 52 are. If the drawer is now pulled, both guide rails 22, 24 are accordingly moved out of the stationary one together Guide rail 20 pulled out, both guide rails remaining mutually locked and thus none Perform relative movement to each other.

When the middle guide rail 22 has reached its maximum extended position shown in FIG Guide rail 20 molded stop 74 is defined, on which the ball cage 26 comes to rest against which in turn the middle guide rail 22 with a rear one

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May 9, 1977 - May 16

If the stop 76 strikes, the inner guide rail 24 carrying the drawer is initially in the position shown in FIG shown intermediate position.

By pulling out the drawer further, the locking mechanism is locked 52 released by the counter-locking member 60 releasing the locking member 56, so that the inner guide rail 24 relative to the central guide rail in its extended position can move according to Figure 3. This end position is fixed, for example, that the on the inside of the middle Latching member 56 provided for guide rail 22 on the end face 80 of the inner guide rail 24 facing it on the inside overlapping ball cage 28 comes to rest (see Fig. 3}, another one provided on the inner guide rail 24 The stop 78 is used to place the ball cage 28 with its front edge 80 against the locking member 56.

In the course of the pull-out movement of the inner guide rail 24, the latter releases the pawl 70 of the locking mechanism 54, which is hinged to the rear end of the middle guide rail 22, so that it can pivot downward into its blocking position according to FIG the plane of the stop pin 72 of the outer guide rail 20 is located. Unless, therefore, the drawer 50 to close it, is pushed back into the engegengesetzte direction is initially the central guide rail 22 as far as i ~ a back move until the pawl stop 70 comes' on the stop pin 72 CBX system, whereby the central guide rail 22 is fixed on the outer guide rail 20 and accordingly only the inner guide rail 24 can be moved into the middle guide rail 22 until it has reached its intermediate position shown in Figure

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swiveled back position. As soon as this happens or the inner guide rail 24 is pushed into the middle guide rail 22, the middle guide rail 22 can move move relative to the outer guide rail 20 into this, so that finally both guide rails 22, 24 their original Reach the starting point together.

The described mandatory sequence of rail displacement offers the advantage evident from the diagram shown in Figure 13: In this diagram, S denotes the displacement path of the drawer, while F illustrates the increase in load.

First of all, the load on a known double pull-out device is explained with the aid of this diagram.

In known devices, when a drawer is pulled out, the inner guide rail first moves out of the middle guide rail off, the inner guide rail extending continuously over a certain distance through the curve piece a shown forms the lever arm, the weight of the drawer growing from it, later Load on the leadership of the middle guide rail is constantly increasing. In the diagram is that of the middle guide rail At the beginning of their shifting movement, the initial load to be managed is indicated at point A.

When the drawer is pulled out further, the middle guide rail 22 starts up, with the curve piece b clarifies that the middle guide rail under relative high initial load is set in motion and in the course their shifting movement this load is still up to

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May 9, 1977 - May 18

Point B continuously increases, resulting in a very high dynamic This results in loading of the guide surfaces taking over the guidance of the central guide rail 22.

By comparison, the forced sequence according to the invention in the displacement sequence of the guide rails has the advantage that initially when pulling out a drawer the dynamic load caused by the load arm formed by the middle guide rail 22 and illustrated by the curve piece d is considerably smaller in its maximum extended position at point C. This means that the dynamic load on their guide surfaces is also correspondingly small. Then the drawer is fully extended and accordingly brought into its Ausziehendstellung the inner guide rail 24, so increases as the cam piece C illustrated in Although the loading ψ utilization continuously & uf the same maximum value B, but with the difference that this increase in load on the guide the middle guide rail 22 only has a static effect. ■!

When the drawer is pushed back, it is initially reduced accordingly the static load on the leadership of the middle guide rail 22 to point C, by only the inner Guide rail 24 moved into the middle guide rail 22, after which finally a dynamic load effective when the middle guide rail 22 is moved back which, however, is constantly shrinking down to its initial size.

In contrast, the management is subject to the middle management f rail 22 in known double pull-out devices when

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retract the drawer initially turn the maximum dynamic load and only from point A is it subject to static load. The described double pull-out device is finally still with one designated as a whole in FIG. 3 with 81 Equipped locking device, with the help of which the sliding guide rails in their starting position within the stationary guide rail can be fixed. This latching device is preferably in one piece with the counter-latching member 60 of the locking mechanism 52 and has a locking recess to which a locking pin 84 is assigned. The latter sits at the front end of the outer rail 20 and engages, as in FIG. 1 1 and 2 show that the guide rails are pushed into one another in the latching recesses 82. This locking device

can also be designed so that by acting on the locking pin 84 becoming clamping forces the inner guide rail together with the middle guide rail inevitably into the outer stationary one Guide rail is drawn into a defined starting position.

The construction according to Figures 6 to 9 differs from the one described above by the locking of the middle Guide rail 22 in the outer guide rail 20 in its maximum extended position. With this construction it is The locking mechanism provided for this purpose is also formed by a limit force locking mechanism designed as a locking mechanism 86 (FIG. 7), which is effective in the longitudinal or displacement direction of the guide rails. The locking member of the locking mechanism is through a Locking bolt 88 is formed, which is attached to the inside of the outer stationary guide rail 20. This locking bolt is assigned a locking recess 90, which is on the ball cage designated as a whole with 92, which is used to guide the

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May 9, 1977 - May 20

middle guide rail 22 serving balls 30 is provided, is seen. For this purpose, the ball cage 92 is shaped U-cross-section and engages the central guide rail 22 on the inner side .. At the, viewed in the pull-out direction, \ front end edge 94 of this ball cage, the longitudinal slot-shaped recess 90 is provided that w is: m this The front edge extends inward and which, in the maximum extended position of the central guide rail 22, engages the ball cage 92 on the locking member 88.

The starting position of the middle guide rail, within the outer guide rail is fixed by a stop 96 on the inside of the middle guide rail 22 is attached and in this position with a counter-stop attached to the inside of the outer guide rail 20 98 cooperates. The stop 96 engages in the locked position of the central guide rail 22 in its maximum Pull-out position into a corresponding recess 100 of the ball cage in order to move the distance required for locking not to restrict.

The locking of the inner guide rail 24 in the middle guide rail 22 takes place with the aid of the one shown in FIGS 4 described locking mechanism 52. Also in this construction, a locking device 81 is provided to the displaceable Complete the guide rails in their common starting position within the outer guide rail 24, however the locking member of which is formed by the locking bolt 88 attached to the outer guide rail.

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May 9, 1977 - May 21

The double pull-out device according to FIGS. 11 to 12 corresponds in its structural design with the exception of the latching element locking mechanism for locking the inner guide rail 24 with the Ij center guide rail 22 in all details of the above-described double pull-out device according to Figures 6 to 9: In this embodiment, the locking arm portions 102, \ 104 of this as a whole with 106 designated and also in \ longitudinal - or direction of displacement of the guide rails effective \

Locking mechanism on one pair of the adjacent longitudinal wall ¹ !

■ - γ-

parts 108, 110 of the sliding guide rails 22, 24 f arranged. The counter-locking member 102 has a distance I from the longitudinal edge part 108 of the guide rail 24 in! The latching projection 112 extending in the direction of the central guide rail 22, which has a latching lug 114 on the latching member 104
is assigned, with at least one of these parts from
elastic-yielding material and both designed in this way
are that the latching lug 114 engages under the latching projection 112 in a substantially form-fitting manner in the latched state.

Claims (4)

HOEGER, STELLRECI ^ T '& P'ÄRTNE'R' "PATENTANWÄLTE UHLANDSTRASSE 14.c - D 7OQO STUTTGART 1 G 77 14 976.9 Applicant: A 42 333 b Schock & Co GmbH v. _ -Ion Gmünder Straße 65? 2. October 1981 706 ° Schorndorf protection claims 1./Double pull-out device for guiding pull-out Share like drawersΓ / with an outer, a middle and an inner guide rail, the outer and the middle guide rail via first rolling elements held in an outer cage arranged between these rails and the inner and the middle guide rail via an inner one arranged between these rails Cage held second rolling elements are telescopically guided together, and with a stop device to determine the extension end positions and the insertion end positions of the center and the inner guide rail, the outer rail being the outer cage and the middle one Guide rail and the latter overlaps the inner cage and the inner guide rail and outer and inner guide rails each one facing outwards and one on opposite one Sides' of the double pull-out device lying wall area for mounting the double pull-out device having, with a coupling device for connecting the inner to the middle Guide rail when pulling out the inner guide rail from the outer guide rail, wherein this coupling device by further removal ti III »· · • I »ι ■ ι ι «·· A 42 333 b b - 189 - 2 - October 12, 1981 pull the inner guide rail out of the middle guide rail in its extended end position is releasable, with a blocking device to prevent insertion of the middle Guide rail into the outer guide rail when the inner guide rail is pushed out of it Pull-out end position out into the middle Füru-angsschiene, this blocking device in the insertion end position of the central guide rail can be released by pressing the inner guide rail in the direction of its insertion end position, characterized in that the coupling device and the blocking device are arranged in a space of the double pull-out device by the outer guide rail and one through the outward-facing wall section of the fully inserted inner guide rail defined level is limited. 2. Double pull-out device according to claim 1, characterized in that that the coupling device designed as a latching connection at the front ends of the inner and the middle guide rail is arranged and releasable by a tensile force, which one exceeds the specified limit. 3. Double extension device according to claim 1 or 2, characterized in that the blocking device designed as a ratchet lock, on the outer guide rail and at the rear end of the middle Arranged guide rail and through the completely pushed into the middle guide rail inner Guide rail is detachable. A 42 333 b b - 189 - 3 - October 12, 1981 4. Double pull-out device according to one or more of claims 1 to 3, characterized in that the blocking device designed as a latching connection and on the outer cage and on the outer Guide rail is arranged.