DE2721231A1 - DOUBLE PULL-OUT DEVICE FOR LINEAR GUIDANCE OF A MOVABLE PART, FOR EXAMPLE A DRAWER - Google Patents

Description

DR.-INS. DIPL.-ING. M. SC. J) .PL.-PHVS. CR. DIPL.-PHYS.

HÖGER - LEGAL RIGHT - GRIES3GACH - HAECKER PATENT LAWYERS IN STUTTGART

Schock S Co GmbH Gmünder Str. 6 5 7oPo Schorndorf

Double pull-out device for a straight line guidance a reciprocating part, for example »one drawer

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DR.-ING. DIPL.-ING. M. SC. D'PL.-PHYS ΓΓ. OIPL.-PHYS. HÖGER - LEGAL RIGHT - ^ RIF.SSBACH - HAECKER PATENT LAWYERS IN STUTTGART 0 7 O 1 OQ4

A 42 333 b
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May 9, 1977

Schock R Co.GmbH
Gmünder Str. 65

7o6o Schorndorf

The invention relates to a double pull-out device for the lateral linear guidance of a reciprocating part, for example a drawer, with an outer, a middle and an inner guide rail, which can be telescopically displaced into one another on roller bodies and of which the outer or the inner guide rail is held on a carrier and the sliding guide rails are fixed in their maximum extended position by a stop.

Allow double pull-out devices of the type described above it is known to pull drawers or the like parts over their entire length from the housing receiving them.

The sliding guide rails are guided freely to and fro, 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 first the middle guide rail is in moved back to its original position before the drawer moved

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sets the supporting guide rail in motion.

From the sequence described in the catfish the rail movements result in the following disadvantage: If, for example, a drawer is pulled out of a furniture body, in this way, the guide rail carrying it, when fully pulled out, forms a protruding from the central guide rail Load arm. If the contents of the drawer are relatively heavy, this means that when the middle guide rail is pulled out the guiding surfaces 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 pulling out the middle guide rail, because of the load arm that is lengthening even further, up to one The highest level is constantly increasing. Consequently, the profiles of the stationary and central guide rails must be dimensioned in such a way that that even under extreme load conditions, their running surfaces are exposed to enormous friction or surface pressure resulting from this withstand 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 middle guide rail only in the initial phase or when retracting in the final phase of the displacement movement a dynamic one and for the remaining part of the displacement path in 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 solved.

Due to the sequence of movements established according to the invention Slidable guide rails ensure that the dynamic load on the guide surfaces for the middle guide rail only lasts until it is brought into its extended position. over this part of the displacement path the load, the load moment increases to an extent that does not yet have an adverse 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 considerable reduction in dynamic load achieved, either the profiles of the guide rails are less pronounced dimensioned or such double pull-out devices can be subjected to significantly higher loads or have a longer service life.

Dar according to the invention provided compulsory expiry of the movable 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 by a lock in each Vsrschiaberichtung.

This locking mechanism controlling the forced sequence can all or only a part in one direction to the longitudinal direction of the guide rails be effective in the transverse direction or exclusively in the longitudinal direction of the guide rails. Here it is favorable if at least the locking mechanism that fixes the two sliding guide rails to one another is a limit force locking mechanism is formed, the formation of which can be varied. For example, it is possible to use one of the sliding guide rails to provide a spring lever that works together with a corresponding projection on the other guide rail the guide rail carrying the load as long as the middle guide rail until it has reached its maximum extended position. But it is also possible to the one guide rail to provide a rotatable roller, for example, which are integrally formed on the other guide rail Protrusion engages behind, in this case for the role hard elastic material should be used. It is also possible to provide a corresponding stopper made of hard rubber, which interacts in a friction-locked manner with a corresponding counter-gliad. However, it is preferred to use a limit force lock Rastgesparre application, advantageously the same forming locking parts in the area of the front end of the sliding Guide rail are arranged. Bai a preferred embodiment, the locking member receiving the counter-locking member is this Rastgesperres designed like a fork, and its resilient fork legs are followed by a latching recess The width is slightly larger than the mutual distance between the fork legs

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is, so that the locking member in this locking recess substantially can snap in positively. Such a locking mechanism is effective in the longitudinal direction of the guide rails except for a reliably effective, but easily detachable mutual Latching of the guide rails to be displaced with one another has the further essential advantage that in the latched State of the guide rails the load-bearing guide rail in the middle guide rail at its front end relative to the latter is perfectly stabilized in height, which results in a relief of the leadership of this guide rail. The locking parts creating the height stabilization can either be attached to the one overlying the other Flat sides of the two displaceable guide rails or on a pair of the adjacent longitudinal edge parts thereof be arranged.

That is the middle guide rail in its maximum extended 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 pushed back essentially into its intermediate position. A pawl, for example, can be used for this purpose be provided dig can be controlled accordingly by the load-bearing guide rail. 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 overlaps on one flat side, one Can form part of this locking mechanism by, for example, a locking recess accessible from one end face is provided in the ball cage 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 FIG Exemplary embodiments of double pull-out devices according to the invention and / or can be found in the claims. In the drawing show:

Fig.l is a side view of a first embodiment a double pull-out device whose guide rails 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 extended position is located

4 shows a partial section along the line 4-4 of FIG. 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 when pushed together State, shown in abbreviated form,

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

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 as 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 string view of the device according to Fig.Io, shown abbreviated, with the middle guide rail in its maximum Auszieh.-position is set,

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

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

In all shown embodiments of double pull-out devices 20 denotes an outer guide rail, 22 a middle guide rail and 24 an inner guide rail, which are slidably mounted in one another by means of balls held in ball cages 26 and 28, for example. Training the guide rails as such is known and does not form part of the invention.

As Figure 5 shows, the outer guide rail has a T-shaped cross section, the legs 32, 34 on the Have a concave curved ball running surface 36 on the inside. The middle guide rail 22 also has a T-shaped cross-sectional shape on and their legs 38, 40 are folded and deformed so that they are opposite ball bearing surfaces 42, 44 own. The inner guide rail 24 has an inverted C-shaped profile cross-section, the legs of which to the ball running surfaces 44 symmetrical outer ball running surfaces 46 own. The balls 30 of the ball cages 26, 28 are guided between the adjacent ball 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 forms the load- bearing guide rail in which, for example, a drawer 50 indicated by dash-dotted lines is attached to it.

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This double pull-out device is equipped with two locking mechanisms designated as a whole wit 52 and 54 through which the Moving the guide rails 22, 24 a forced sequence in the sequence of movements is achieved. This is what the two 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 forms a locking mechanism that acts as a locking mechanism Limit force lock. The same is done by a locking member attached to the front end of the central guide rail 22 formed for example in the form of a circular cylindrical pin, the one on the opposite side of the wall part the inner guide rail 24 is assigned a counter-locking member 60 which is fork-like and whose fork legs 62, 64 are to be bent apart resiliently elastically to the side. One connects to these fork legs Latching recess 66, in which the latching member 56 is able to latch essentially positively when it is previously between the two fork legs 62, 64 has been moved through. (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 automatically pivots into its stop position shown in FIG. 3 under the effect of its heavy weight. The stop 70 ^{1 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 one Guide rail 22 is moved into the outer guide rail 20. The inner guide rail 24 forms here at the same time a control member to the pawl hinged on the central guide rail in its release position, according to Figure 1 and 2, swivel back as soon as the inner guide rail 24 has essentially reached its position within the central guide rail 22. 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 it is assumed that the drawer 50 is located within the furniture 48 and is 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 together by the locking mechanism 52 are. If the Sfoublade is now pulled, both guide rails 22, 24 are accordingly removed from the stationary one 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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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 activated 52 solved in that the counter-locking member 60 releases the locking member 56, so that the inner guide rail 24 can move relative to the central guide rail into its extended position according to FIG. This end position is for example fixed in that the locking member 56 provided on the inside of the central guide rail 22 is attached to it facing end 80 of the inner guide rail 24 on the inside overlapping ball cage 28 comes to rest (see Fig. 3). Another stop 78 provided on the inner guide rail 24 serves to hold the ball cage 28 with its Front edge 80 to be placed against the locking member 56.

During the pull-out movement of the inner guide rail 24 this releases the pawl 70 of the locking mechanism 54, which is hinged to the rear end of the central guide rail 22, so that this, according to Figure 3, can pivot down into its locking position, in which the stop 70 'is in the Level of the stop pin 72 of the outer guide rail 20 is located. If, therefore, the drawer 50 to close it, is pushed back in the opposite direction, the middle guide rail 22 will initially move back so far that until the pawl stop 70 'comes to rest on the stop pin 72, whereby the middle guide rail 22 is fixed on the outer guide rail 20 and accordingly only the inner guide rail 24 in the middle Guide rail 22 can be moved in until it has reached its intermediate position shown in Figure 2, in which it the pawl 70 inevitably upwards into its release

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swiveled back position. As soon as this has happened or the inner guide rail 24 into the middle guide rail is pushed in, the middle guide rail can move into this relative to the outer guide rail 20, 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 extension device explained.

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, with 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 movement, the initial load to be managed is displayed at point A.

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

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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.

In comparison, the forced sequence according to the invention produces In the sequence of movement of the guide rails, the advantage is that the dynamic load is initially applied when a drawer is pulled out by the load arm formed by the middle guide rail 22 and illustrated by the curve piece d in the maximum extended position at point C is considerably smaller. This means that the dynamic load on their guide surfaces is also correspondingly small. Will subsequently the drawer is fully extended and, accordingly, the inner guide rail 24 is brought into its extended position, see above as curve segment C illustrates, the load increases continuously to the same maximum value B, however with the difference that this increase in load on the guidance of the central guide rail 22 is only static affects.

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 when moving back the middle guide rail 22 is effective, but which is constantly up to its initial size scaled down.

In contrast, the guide is subject to the middle guide rail 22 with known double pull-out devices when loading

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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 double pull-out device described is finally equipped with a locking device designated as a whole in Figure 3 with 81, with the help of which the displaceable guide rails can be fixed in their initial position within the stationary guide rail. These The locking device is preferably integral with the counter locking member 60 of the locking mechanism 52 and a locking recess to which a locking pin 84 is assigned. The latter is seated at the front end of the outer rail 20 and, as shown in FIGS. 1 and 2, engages when the guide rails are pushed into one another into the locking recesses 82. This locking device can also be designed in such a way that it is effective 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 FIGS. 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 that 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 pin 88 formed on the inside of the sweeter stationary guide rail 20 is attached. This locking bolt is assigned a locking recess 90 which is on the as Whole with 92 designated ball cage, which is used to guide the

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middle guide rail 22 serving balls 30 is provided is. For this Zv / corner the ball cage 92 is U-shaped in cross section and engages over the central guide rail 22 on the inside. On the front edge 94 of this ball cage, seen in the pull-out direction, is the longitudinal slot-shaped Rastausnohmung 90 is provided, which extends from this front edge inward and which is in the maximum extended position the middle guide rail 22 latches the ball cage 92 on the latching member 88.

The starting position of the middle guide rail within the outer guide rail is determined by a stop 96, which is attached to the inner row of the middle guide rail 22 and in this position with one on the inside the counter-stop 98 attached to the outer guide rail 20 is joined together. The stop 96 engages in the locked Position of the middle guide rail 22 in its maximum extended position in a corresponding recess 10 0 of the ball cage in order not to restrict the displacement required for locking.

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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The construction of the double pull-out device according to Figures It to 12 corresponds to the above-described double pull-out device according to FIGS , 1O4 this designated as a whole with 1OG and also in longitudinal bzv7. Verschieberichtuim the guide rails effective catch mechanism on a pair of the mutually adjacent L; ings ^ra ndtelle 108, 110 of the verschiobbaren guide rails 22, disposed 21st At a distance from the longitudinal edge part 108 of the guide rail 24, the counter-latching element 1O2 has a latching projection 112 extending in the direction of the central guide rail 22, to which a latching lug 11} is assigned on the latching element 104, v / obei at least one of these parts is made of elastic- resilient material and both are designed in such a way that the latching lug 11-1 engages under the latching projection 112 in a substantially form-fitting manner in the latched state.

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Claims (1)

Patent claims: J Double extension device for straight guidance of a - reciprocating part, for example a drawer, with an outer, a middle and an inner Guide rails, which are telescopically guided in one another on roller bodies and of which the outer or inner guide rail is held on a carrier and the sliding guide rails in their maximum extension position are fixed by a stop, characterized in that the middle and the guide rail which is displaceable relative to it (22, 24) are positively controlled in their displaceability relative to one another by at least one locking mechanism (52) are that when extending the guide rail (24), which is displaceable relative to the central guide rail (22) can only be moved when the middle guide rail (22) is in its maximum extended position and that when sliding into one another, the middle guide rail (22) essentially only after the other has been inserted Guide rail (24) can be pushed back into its starting position. 2. Double pull-out device according to claim 1, characterized in that that at least one locking mechanism in a direction transverse to the longitudinal direction of the guide rails (22, 24) is effective. 809846/0343 y - 123 May 9, 1977 -S- 3. Double pull-out device according to claim 1, characterized in that that at least one locking mechanism (52) is effective in the longitudinal direction of the guide rails (22, 24). 4. Double pull-out device according to one of the preceding claims, characterized in that at least the two displaceable guide rails (22, 24) relative to one another fixing locking mechanism (52) is designed as a limit force locking mechanism. 5. Double pull-out device according to one of the preceding claims and 3 and 4, characterized in that the two displaceable guide rails (22, 24) in their The limit force lock (52) that defines the starting position is designed as a latching lock. 6. Double pull-out device according to claim 5, characterized in that that the two locking mechanism parts (56, 60) forming the locking mechanism (52) are in the area of the front end of the sliding guide rails (22, 24) are. 7. Double pull-out device according to claim 5 or 6, characterized in that the receiving member (56) Counter-locking member (60) of the locking mechanism (52) is fork-like is on the resilient fork legs (62, 64) is followed by a locking recess (66), the width of which is slightly larger than the mutual distance between the fork legs (62, 64) and that the locking member (56) through a pin which engages in a substantially positively locking manner in the latching recess (66) is formed. y - 123 May 9, 1977 -S- 8. Double extension device according to claim 6 or 7, characterized in that the locking parts (56, 60) on the opposite flat sides of the two displaceable guide rails (22, 24) are arranged. 9. Double pull-out device according to claim 6, characterized in that that the locking parts (56, 60) on a pair (108, 110) of the adjacent longitudinal edge parts the displaceable guide rails (22, 24) are arranged. 10. Double pull-out device according to one of the preceding claims, characterized in that the displaceable guide rails (22, 24) are in their common starting position can be latched on the stationary guide rail (20) by means of a latching device (81). 11. Double pull-out device according to claim 10, characterized in that that the one section (82) of the locking device (81) is provided on the guide rail (24) which is displaceable relative to the central guide rail (22). 12. Double extension device according to claim 11, characterized in that that the part provided on the guide rail (24) displaceable to the central guide rail (22) (82) of the locking device (81) in one piece with the section (60) of the locking mechanism provided on this guide rail is. 13. Double pull-out device according to claim 12, characterized in that that both sections (60, 82) of the locking device 809846/0343 y - 123. May 9, 1977 _ 4 - device (81) or the locking mechanism (52) are formed by a molded part made of plastic. 14. Double pull-out device according to one of the preceding claims / characterized in that the middle guide rail (22) in its maximum extended position on the the stationary guide rail (20) locking mechanism (54) with a stop (72) cooperating with a pawl (70) which, when the other guide rail (24) is pulled out of the central guide rail (22), automatically moves into their locked position pivots and when the extended guide rail is pushed back through this into its release position is movable. 15. Double pull-out device according to one of the preceding claims 1 to 13, characterized in that the middle Guide rail (22) in its maximum extended position on the stationary guide rail (20) locking locking mechanism (86) is also designed as a locking mechanism. 16. Double pull-out device according to claim 15, .. their displaceable guide rails are each guided displaceably by means of the balls of a ball cage are, characterized in that at least the between the central guide rail (22) in the stationary guide rail (20) arranged ball cage (92) in a known manner in cross-section U-shaped is and the middle guide rail (22) overlaps on a flat side and that the latching member (88) receiving Counter locking member (90) of the locking mechanism (86) by a 809846/0343 y - 123 May 9, 1977 -3 either in the ball cage (92) or on the stationary guide rail (20) provided locking recess is formed and the locking member (88) is arranged on the other part. 809846/0343