Automatic retraction device

Abstract

The invention provides an automatic retraction device for a furniture part (51) which can be pulled out of a furniture body (50) in a pull-out direction (4) by means of a pull-out guide, comprising a slider (6) which is movably supported by a base body (5), a retraction spring (13) which loads the slider (6) into a basic position, wherein the slider (6) can be moved from the basic position into a waiting position by means of a coupling to a carrier element (33), in which waiting position the carrier element (33) can be uncoupled from the slider (6) and in which waiting position the slider (6) is held against the force of the retraction spring (13), and a damping unit (22) for exerting a damping on the movement of the slider (6) from the waiting position into the basic position. The slider (6) is coupled to a movable part (22b) of the damping unit (22) by means of an arm (23), which arm can be pivoted relative to the slider (6) about a first pivot axis (24) and relative to the damping unit (22) about a second pivot axis (25), wherein one of the pivot axes (24, 25) is movable and the arm is guided by the base body (5) between a rear end position and a front end position, wherein the arm (23) is pivoted about an axis which is perpendicular to the pull-out direction (4) when the slider (6) is moved by the retraction spring (13) over a retraction stroke at least in a final section of the retraction stroke.

Description

TECHNICAL FIELD

[0001] The invention relates to an automatic retraction device for a furniture part which can be pulled out of a furniture body along a pull-out direction by means of a pull-out guide and can be pushed into the furniture body against the pull-out direction, comprising a slider which is supported by a base body in such a way that it can be pushed from a basic position into a waiting position, a retraction spring which loads the slider into the basic position, wherein the slider can be moved from the basic position into the waiting position against the force exerted by the retraction spring by means of a coupling with a carrier which can be moved along the pull-out direction, in the waiting position the carrier can be uncoupled from the slider and in the waiting position the slider is held against the force of the retraction spring, and a damping unit for exerting a damping on the movement of the slider from the waiting position into the basic position, the damping unit having a movable part which can be moved along and against the pull-out direction, the movable part being coupled with the slider. BACKGROUND

[0002] Such automatic retraction devices are mostly integrated in the pull-out guide. Such automatic retraction devices are known, for example, from WO 2008 / 119091 Al. The damping unit for damping the retraction movement is constituted by a pneumatic piston-cylinder unit. Damping units of other configurations, for example rotary dampers, have also been used in automatic retraction devices. In order to prevent the pull-out of the pull-outable furniture part from the fully pushed-in state of the pull-outable furniture part from being impeded by the damping unit, the damping unit preferably only acts in the direction of the push-in. In order not to impede the retraction in the end section of the retraction movement before the fully pushed-in state of the pull-outable furniture part is reached and thus to reliably achieve the fully pushed-in state of the pull-outable furniture, the conventional piston-cylinder unit for damping also has a free stroke in the last section of the piston in the cylinder. However, in order to obtain a sufficient damping stroke, so that even when the pull-outable furniture part is pushed with force, this furniture part is reliably braked even in the fully loaded state, this free stroke enlarges the required overall construction length of the piston-cylinder unit at the end of the retraction stroke. The overall construction length of the automatic retraction device is thus also enlarged. This leads to the pull-outable guide having to be constructed correspondingly shorter when integrated into the pull-out guide. A part of the pull-out length of the pull-out device is thus lost.

[0003] In order to enlarge the retraction force of the automatic retraction device in the last section of the retraction stroke, according to the teaching of AT 521 511 Bl, the retraction spring acts onto a lever which is supported in such a way that it can be pivoted relative to the slider and the base body of the automatic retraction device. The pivot axis relative to the base body can here be moved relative to the lever or relative to the base body, in particular by means of a slide which is arranged in the lever or in the base body, into which a guide pin constituting the pivot axis is fitted. The course of the retraction force exerted by the retraction spring onto the slider can thus be matched depending on the position of the slider. SUMMARY

[0004] It is the task of the present invention to provide an advantageous automatic retraction device of the type mentioned at the outset, which has a small construction length for a long retraction stroke. According to the invention, this is achieved by an automatic retraction device having the features of claim 1.

[0005] In the automatic retraction device according to the invention, the slider is coupled to the movable part of the damping unit by means of an arm. This arm can be pivoted relative to the slider about a first pivot axis and relative to the damping unit about a second pivot axis. The first pivot axis can be displaceable relative to the arm or the slider and / or the second pivot axis can be displaceable relative to the arm or the movable part of the damping unit. The arm is guided by the base body between a rear end position and a front end position, the arm occupying the rear end position in the basic position of the slider and the arm occupying the front end position in the waiting position of the slider. In the movement of the slider from the waiting position into the basic position, the arm is rotated about an axis perpendicular to the pull-out direction at least in the end section of the movement of the arm before reaching its rear end position (= in the end section of the retraction stroke). Thus, in this end section of the movement of the arm before reaching the rear end position, the displacement path of the slider is greater than the displacement path of the movable part of the damping unit, preferably more than twice as great. Thus, in the end section of the retraction stroke, the damping force exerted by the damping unit onto the slider is reduced, preferably to within half.

[0006] The free travel of the damper can thus be reduced in the end section of the movement of the slider from the waiting position into the basic position and is preferably completely omitted. The necessary construction length of the damper can thus be shortened.

[0007] The damper is preferably constructed in the form of a piston-cylinder unit, in particular a pneumatically acting piston-cylinder unit.

[0008] For guiding the arm, the base body advantageously has a slide groove, into which at least one guide pin of the arm is engaged. Two guide pins of the arm are preferably engaged into the slide groove in order to guide the combined displacement and pivoting of the arm. In a variant, an elongated guide pin of the arm can also be provided, which is engaged into a slide groove of the base body, or two slide grooves of the base body can be provided, into which corresponding guide pins of the arm are engaged.

[0009] An advantageous embodiment of the application provides that the retraction spring acts on a spring lever which can be pivoted relative to the base body about a first pivot axis and can be pivoted relative to the slide about a second pivot axis, wherein the first pivot axis can be moved relative to the base body or relative to the spring lever. By this, the conversion of the spring force onto the slide can be modified over the retraction stroke of the slide. In particular, the force acting onto the slide in the end section of the slide from the rest position into the basic position (= over the end section of the retraction stroke) can be increased in order to ensure a fully retracted state of the pull-out furniture part.

[0010] In a possible embodiment of the application, the slide has a tilting element which is supported in such a way that it can be pivoted about a tilting axis between an engagement position and a release position. In the basic position of the slide, the tilting element occupies the engagement position and the carrier element is coupled with the tilting element. For this, the carrier element can engage into a recess of the tilting element in the engagement position. The carrier element can also have a recess into which a protrusion of the tilting element engages. The tilting element is tilted into the release position in the rest position of the slide. In this release position, the carrier element is uncoupled from the tilting element, for example, because the carrier element is moved out of the recess of the tilting element, and the tilting element is held by the base body against movement in the pull-out direction. Thus, the tilting element also forms a holding device for holding the slide in the rest position when the slide is uncoupled from the carrier element. Other constructional solutions of such a holding device are possible and known. The slide is, for example, automatically tilted about an axis perpendicular to the pull-out direction (by a correspondingly curved guide of the base body) in the end section of the movement before reaching the rest position, so that the carrier element can also be moved out of the recess in the slide, and the slide can be held against movement in the pull-out direction directly by abutting on a holding surface of the base body.

[0011] When in this description "front" and "rear" are mentioned, then this refers to the pull-out direction. BRIEF DESCRIPTION OF DRAWINGS

[0012] Further advantages and details of the application are explained in the following with the aid of the drawings. In the drawings:

[0013] Figure 1 a pull-out guide with an integrated automatic retraction device according to an embodiment of the application is shown in a pushed-in state of the pull-out guide;

[0014] Figure 2 is a perspective view corresponding Figure 1 to the pull-out guide in a pulled-out state of the pull-out guide;

[0015] Figure 3 and 4 are side views of the pull-out guide in a retracted and in a pulled-out state of the pull-out guide;

[0016] Figure 5is an oblique view of the pull-out guide and the automatic retraction device on the opposite side, without the central guide and the base guide;

[0017] Figure 6 is an oblique view of the guide rails of the pull-out guide, detached from each other;

[0018] Figure 7 is an oblique view of the automatic retraction device in the basic position of the slider;

[0019] Figure 8 is an oblique view of the automatic retraction device in the waiting position of the slider corresponding Figure 7

[0020] Figure 9 and 10 are oblique views of the automatic retraction device in the basic position and in the waiting position of the slider, viewed from different viewing directions;

[0021] Figure 11 and 12 are exploded views of the automatic retraction device, viewed from different viewing directions;

[0022] Figure 13 is a side view of the automatic retraction device in the basic position of the slider;

[0023] Figure 14 is a side view in a first intermediate position of the slider, moved along the pull-out direction with respect to the basic position;

[0024] Figure 15 is a side view in a second intermediate position of the slider, moved further along the pull-out direction with respect to the basic position; Figure 14

[0025] Figure 16 is a side view in the waiting position of the slider;

[0026] Figures 17 to 20 is a side view corresponding Figures 13 to 16 to the base without the retraction device;

[0027] Figures 21 to 24 is a side view corresponding Figures 13 to 16 to the base without the automatic retraction device in the position of the slider;

[0028] Figures 25 to 28 is a side view corresponding Figures 21 to 24 to the base without the automatic retraction device;

[0029] Figures 29 to 32 is an extremely schematic view of a modified embodiment variant of the present invention. DETAILED DESCRIPTION

[0030] A first embodiment of the present invention is shown in Figures 1 to 28 ​​The automatic retraction device is integrated into a pull-out guide which, in the embodiment shown, comprises a main rail 1, a central rail 2 and a pull-out rail 3. The pull-out guide is constructed here in the pattern of a differential pull-out guide in which the central rail 2 travels through half the path of the pull-out rail 3 on pulling out and pushing in, respectively. All the rollers can be arranged on the central rail 2 as shown. The pull-out guide can be constructed in a conventional manner and the arrangement of the rollers and their mode of operation are not explained in any greater detail here.

[0031] The automatic retraction device according to the application can also be integrated into other types of pull-out guides, for example also into pull-out guides having only one main rail and one pull-out rail.

[0032] The pull-out rail 3 is pulled out from the fully pushed-in state in a pull-out direction 4, the pushing in of the pull-out rail 3 taking place against the pull-out direction 4.

[0033] Only in the Figure 2 Some parts of the furniture main body 50 and of the pull-out furniture part 51 are shown in dashed lines in which the main rail 1 is to be mounted on the furniture main body 50 and the pull-out rail 3 is to be mounted on the furniture part 51.

[0034] The automatic retraction device has a base body 5 from which a slide 6 is supported which can be moved parallel to the pull-out direction 4 between a basic position Figure 7 , 9 , 13, 17, 21 and 25) and a waiting position Figure 8 , 10 , 16, 20, 24 and 28).

[0035] In order to be movably guided, the slide 6 has grooves 7 on both sides into which tabs 8 of the base body 5 which extend parallel to the pull-out direction 4 and face one another are fitted. The slide 6 can also have projecting guide pins which are fitted into slide grooves in the base body, for example constructed in the form of long holes, in order to be movably guided on the base body 5.

[0036] On the slide 6, a tilting element 9 is supported which can be tilted (= rotated) about a tilting axis 10 (also referred to as a swivel axis or a rotation axis). In the basic position of the slide 6, the tilting element 9 occupies a fitted position with respect to its tilting about the tilting axis 10, and in the waiting position of the slide 6 a released position. The tilting axis 10 can be formed, for example, by means of a journal 11 of the tilting element 9 which is fitted into an axial recess 12 of the slide 6.

[0037] The tilting axis 10 is perpendicular to the pull-out direction 4 and is preferably horizontal.

[0038] A retraction spring 13 acts on the spring lever 14. The spring lever 14 can be pivoted relative to the base body 5 about a first pivot axis 15 and relative to the slide 6 about a second pivot axis 16. The first pivot axis 15 is movable relative to the base body 5 and is not movable relative to the spring lever. The second pivot axis 16 is not movable relative to the slide 6 and relative to the spring lever. For the movability of the first pivot axis 15 relative to the base body 5 it can be provided, for example, that the spring lever 14 has a journal 17 which is inserted into a spring lever slide 18 of the base body 5 which is formed here by a long hole which extends in a curve. The retraction spring 13 acts on a fixed pin 19 of the spring lever 14 which is located between the first and second pivot axes 15, 16.

[0039] The second pivot axis 16 is formed, for example, by a journal 20 of the spring lever 14 which is inserted into an axis recess 21 of the tilt 9.

[0040] The first and second pivot axes 15, 16 which are parallel to one another are perpendicular to the pull-out direction 4 and are preferably horizontal.

[0041] By the action of the retraction spring on the spring lever 14 and in combination with the movability of the first pivot axis in a corresponding direction which can also change here depending on the position of the slide, a conversion of the spring force acting on the slide depending on the position of the slide is achieved. On a movement path of the slide which is immediately adjacent to the basic position of the slide, a greater change in the length of the spring occurs than on the same movement path of the slide when the slide is closer to the waiting position. The spring force acting on the slide can thus be increased on the last section of the retraction stroke before the basic position of the slide is reached compared to the direct action of the retraction spring on the slide.

[0042] A damping unit 22 is provided for damping the movement of the slide 6 from the waiting position to the basic position. This damping unit has a piston-cylinder unit 22a which acts, for example, hydraulically or pneumatically, as a damper. The cylinder is connected non-movably to the base body 5. The piston rod is connected to a movable part 22b of the damping unit which is guided by the base body 5 in such a way that it can move parallel to the pull-out direction 4. The movement of the movable part 22b against the pull-out direction is damped by the piston-cylinder unit 22a, while the movement in the opposite direction is not damped. Dampers which act, in particular pneumatically, with a free play in the direction of movement are known.

[0043] A kinematically opposite arrangement of the piston-cylinder unit is also conceivable and possible, i.e. the piston rod is not movable relative to the base body 5, while the cylinder is movable and is connected non-movably to the movable part of the damping unit.

[0044] The movable part 22b of the damping unit 22 is coupled with the slide 6 by means of an arm 23. The arm 23 is pivotable (= rotatable) about a first pivot axis 24 relative to the slide 6 and is pivotable (= rotatable) about a second pivot axis 25 relative to the movable part 22b of the damping unit 22. The second pivot axis 5 can be formed, for example as shown, by a journal 26 of the movable part 22b of the damping unit 22, which is inserted into a journal recess 27 of the arm 23. The first pivot axis 24 can be formed, for example as shown, by a journal 28 of the slide 6, which is inserted into a long hole 29 of the arm 23.

[0045] The first pivot axis 24 is movable relative to the arm 23 and is not movable relative to the slide 6, and the second pivot axis 25 is not movable relative to the arm 23 and relative to the movable part 22b of the damping unit 22.

[0046] The first and second pivot axes 24, 25, which are parallel to one another, are perpendicular to the pull-out direction 4 and are preferably horizontal.

[0047] The arm 23 is supported by the base body 5 in such a way that it can be moved between a rear end position and a front end position. The arm 23 occupies the rear end position in the basic position of the slide 6. The arm 23 occupies the front end position in the waiting position of the slide 6. In the front end position, the arm 23 is moved relative to the rear end position in the pull-out direction and is pivoted about an axis which is perpendicular to the pull-out direction 4 and which is horizontal in this embodiment. This axis about which the arm 23 is pivoted relative to the rear end position in the front end position is formed in this embodiment by the second pivot axis 25.

[0048] In order to guide the arm 23, the base body 5 has a slide groove 30 into which first and second guide pins 31, 32 of the arm 23 are inserted.

[0049] In a rear end section of the slide groove 30, the slide groove 30 has a downward and upward convexity, into which the guide pins 31, 32 are located in the rear end position of the arm 23.

[0050] In the shown embodiment, the slide groove 30 also has a downward and upward convexity in a front end section, into which the guide pins 31, 32 are located in the front end position of the arm 23.

[0051] A carrier 33, which cooperates with the slide 6 by means of the ramp 9, is formed in the shown embodiment by a section of the pull-out rail 3, see Figure 5 The downwardly projecting tab 3a of the profile forming the pull-out rail 3 has for this purpose in the rear end region a projection which forms the carrier 33.

[0052] In the basic position of the slider 6, in which the tilting element 9 is in its engagement position, the entraining element 33 is engaged in the recess 9a of the tilting element. The pull-out rail 3 is here in its fully pushed-in position.

[0053] If the pull-out rail 3 is pulled out from its fully pushed-in position in the pull-out direction 4, the entraining element 33 is pulled by the tilting element 9 from its basic position in the pull-out direction 4 towards the direction of its waiting position against the force of the retraction spring 13, which is transmitted to the slider 6 by the spring lever 14. In the last section of the movement of the slider 6 until this slider reaches the waiting position, the tilting element 9 is pivoted about the tilting axis 10 from its engagement position into the release position. In the release position, the entraining element 33 can be moved out of the recess 9a of the tilting element 9.

[0054] In the release position of the tilting element 9, the holding section 9b of the tilting element 9 lies against the holding face 5a of the base body. By the lying of the holding section 9b against the holding face 5a, a movement of the slider from the waiting position towards the basic position due to the force of the retraction spring 13 is prevented. The slider 6 thus remains in the waiting position.

[0055] In the movement of the slider from the basic position towards the waiting position, the tilting element is first prevented from tilting about the tilting axis 10 by the base body, in particular by the base body movably guiding the tilting element parallel to the pull-out direction 4. In the described embodiment, the slots 9d on both sides of the tilting element 9 are engaged in the tabs 8 of the base body. In the last section of the movement of the slider 6 until this slider reaches the waiting position, the slots 9d are moved out of the front end of the tabs 8, thus enabling the pivoting of the tilting element 9 from the engagement position into the release position.

[0056] In the movement of the slider from the basic position towards the waiting position, the tilting element is first prevented from tilting about the tilting axis 10 by the base body, in particular by the base body movably guiding the tilting element parallel to the pull-out direction 4. In the described embodiment, the slots 9d on both sides of the tilting element 9 are engaged in the tabs 8 of the base body. In the last section of the movement of the slider 6 until this slider reaches the waiting position, the slots 9d are moved out of the front end of the tabs 8, thus enabling the pivoting of the tilting element 9 from the engagement position into the release position.

[0057] When the slider 6 is moved from the waiting position in the direction of the basic position, the arm 23 is first rotated about an axis perpendicular to the pull-out direction, in the described embodiment the second pivot axis 25, in the initial section of the retraction stroke. By this it is possible to decelerate the movement of the slider 6 to the movable part 22b of the damping unit 22. The distance of the movement of the slider 6 against the pull-out direction 4 is therefore greater than the movement path of the movable part 22b of the damping unit. The onset of the damping effect of the damping unit 22 is therefore less abrupt.

[0058] It is also possible to omit this rotation of the arm 23 in the initial section of the retraction stroke. For this the convexity of the slide in the terminal section in front of it can be omitted.

[0059] Next is the intermediate section of the retraction stroke, on which the arm 23 is moved by the slider 6 against the pull-out direction 4 without rotation of the arm 34. In this intermediate section a 1 : 1 transmission of the movement of the slider 6 to the movable part 22b of the damping unit is achieved.

[0060] In the terminal section of the retraction stroke (= terminal section of the movement of the slider before it reaches its basic position) and thus of the movement before the arm reaches its terminal position behind it, the arm 23 is further rotated about an axis perpendicular to the pull-out direction, in the described embodiment the second pivot axis 25 (in the same direction of rotation as in the initial section). By this it is possible to decelerate the movement of the slider 6 to the movement of the movable part 22b of the damping unit 22 in the terminal section of the retraction stroke. On this terminal section of the retraction stroke the movement path of the slider is therefore greater than the movement path of the movable part 22b of the damping unit 22, preferably at least twice as great.

[0061] The rotation of the arm 23 about an axis perpendicular to the pull-out direction, which in the described embodiment is formed by the second pivot axis 25, is caused by the force exerted on the arm 23 by the retraction spring 13 via the spring rod 14 and the slider 6 in the region of its first pivot axis 24.

[0062] The guiding of the movable part 22b of the damping unit is achieved in the described embodiment by the journal 26 of the movable part 22b and the further guide pin 34 being inserted into the slide 30 of the base body 5. Other types of movable guiding are possible, for example by a separate slide in the base body or by a strip on one of the two parts, which is inserted into a slot on the other of the two parts.

[0063] Figures 29 to 31 An embodiment variant is shown very schematically in which the slider 6 is coupled to the damping unit 22 by the arm 23.

[0064] In Figures 29 to 31The arm is not shown in the diagram as having a movable and rotatable support on the base. This could be achieved in a manner similar to that described earlier.

[0065] according to Figure 29 The first pivot axis 24 is movable relative to the slider 6 (and immovable relative to the arm 23), while the second pivot axis 25 is immovable relative to the movable portion 22b of the damping unit 22 and the arm 23. To move the first pivot axis 24 relative to the slider 6, the slider has, for example, an elongated hole 35 into which the journal of the arm 23 is fitted.

[0066] according to Figure 30 The first pivot axis 24 is immovable relative to the slider 6 and the arm 23, while the second pivot axis 25 is movable relative to the arm 23 but immovable relative to the movable portion 22b. To enable the second pivot axis 25 to be movable relative to the arm 23, this arm has, for example, an elongated hole 36 into which the journal of the movable portion 22b of the damping unit 22 is fitted.

[0067] according to Figure 31 The first pivot shaft 24 is immovable relative to the arm 23 and the slider 6, while the second pivot shaft 25 is movable relative to the movable portion 22b of the damping unit 22 and immovable relative to the arm 23. To enable the second pivot shaft 25 to move relative to the movable portion 22b of the damping unit 22, the movable portion 22b has, for example, an elongated hole 37 into which the journal of the arm 23 is fitted.

[0068] exist Figure 29 In the modified implementation scheme, arm 23 rotates around the second swing axis 25, while pressing... Figure 30 and 31 In the modified implementation scheme, arm 23 rotates around the first swing axis 24.

[0069] Figure 32 A modified configuration in which the return force of the return spring 13 is transmitted to the slider 6 is shown in a highly schematic manner. The spring rod 14 is oscillating about a first rotation axis 15 relative to the base 5 and about a second rotation axis 16 relative to the slider 6. The first rotation axis 15 is immovable relative to the base 5 but movable relative to the spring rod 14. For this purpose, the spring rod 14 has, for example, a spring rod groove 38 into which the journal of the base 5 is fitted.

[0070] Further modifications to the illustrated embodiment are conceivable and possible without departing from the scope of the invention as defined in the claims. For example, both the first pivot axis 24 and the second pivot axis 25 are movable relative to one of the two components interconnected by the respective pivot axes 24, 25. The pivoting of the arm 23 during its rotation also occurs about an imaginary axis, perpendicular to the pull-out direction 4, defined by the guidance of the arm 23 on the base 5, which is preferably horizontal.

[0071] The movement of the slider between the basic position and the waiting position can also take place along a curved track. In this case an overall tilting of the slider can take place, thus eliminating a separate tilting element.

[0072] List of reference signs

[0073] 1 main guide 22b movable part

[0074] 2 central guide 23 arm

[0075] 3 pull-out guide 24 first swivel axis

[0076] 3a web 25 second swivel axis

[0077] 4 pull-out direction 26 shaft journal

[0078] 5 base body 27 shaft recess

[0079] 5a retaining face 28 shaft journal

[0080] 6 slider 29 long hole

[0081] 7 slot 30 slide groove

[0082] 8 web 31 first guide pin

[0083] 9 tilting element 32 second guide pin

[0084] 9a recess 33 carrier element

[0085] 9b retaining section 34 guide pin

[0086] 9c contact face 35 long hole

[0087] 9d slot 36 long hole

[0088] 10 tilting axis 37 long hole

[0089] 11 shaft journal 38 spring rod slide groove

[0090] 12 shaft recess 50 furniture main body

[0091] 13 retraction spring 51 pull-out furniture part

[0092] 14 spring rod

[0093] 15 first swivel axis

[0094] 16 second swivel axis

[0095] 17 shaft journal

[0096] 18 spring bar runner

[0097] 19 fixing pin

[0098] 20 journal

[0099] 21 shaft recess

[0100] 22 damping unit

[0101] 22a piston-cylinder unit

Claims

1. Automatic retraction device for a furniture part, which can be pulled out of a furniture body (50) along a pull-out direction (4) by means of a pull-out guide and can be pushed into the furniture body (50) against the pull-out direction (4), comprising: - a slider (6) which is supported by a base body (5) in such a way that it can be moved from a basic position into a waiting position, - a retraction spring (13) which loads the slider (6) into the basic position, wherein the slider (6) can be moved from the basic position into the waiting position against the force exerted by the retraction spring (13) by means of a coupling with a carrier element (33) which can be moved along the pull-out direction (4), in the waiting position the carrier element (33) can be uncoupled from the slider (6), and in the waiting position the slider (6) is held against the force of the retraction spring (13), and - a damping unit (22) for exerting a damping on the movement of the slider (6) from the waiting position into the basic position, the damping unit having a movable part (22b) which can be moved along and against the pull-out direction (4), which is coupled with the slider (6), characterized in that the slider (6) is coupled with the movable part (22b) of the damping unit (22) by means of an arm (23), which can be pivoted relative to the slider (6) about a first pivot axis (24) and relative to the damping unit (22) about a second pivot axis (25), wherein the first pivot axis (24) can be moved relative to the arm (23) or the slider (6), and / or the second pivot axis (25) can be moved relative to the arm (23) or the movable part (22b) of the damping unit (22), and the arm is guided by the base body (5) between a rear end position and a front end position, the arm (23) occupies the rear end position in the basic position of the slider (6), and the arm (23) occupies the front end position in the waiting position of the slider (6), wherein the arm (23) rotates about an axis which is perpendicular to the pull-out direction (4) at least in a terminal section of the retraction stroke when the slider (6) is moved by the retraction spring (13) from the waiting position into the basic position of the slider (6), and the movement path of the slider (6) is greater than the movement path of the movable part (22b) of the damping unit (22) over this terminal section of the retraction stroke. The base body (5) has a slide (30) for guiding the arm (23), at least one guide pin (34) of the arm (23) being engaged in the slide (30).

3. Automatic retraction device according to claim 1 or 2, characterized in that: - the first pivot axis (24) is formed either by a journal which is arranged on the slider (6) and is movably supported in a slot of the arm (23), or by a journal which is arranged on the arm (23) and is movably supported in a slot of the slider (6), and / or - the second pivot axis (25) is formed either by a journal which is arranged on the slider (6) and is movably supported in a slot of the damping unit (22), or by a journal which is arranged on the damping unit (22) and is movably supported in a slot of the slider (6). ​ ​ 2. The automatic retraction device of claim 1, wherein, ​ ​ ​ - the second swivel axis (25) is formed either by a journal arranged on the damping unit (22) and movably supported in a slot of the arm (23), or by a journal arranged on the arm (23) and movably supported in a slot of the movable part (22b) of the damping unit (22).

4. The automatic retraction device of claim 1 or 2, wherein The movable part (22b) of the damping unit (22) is guided by the base body (5) in such a way that it can be moved parallel to the pull-out direction (4).

5. The automatic retraction device of claim 1, wherein, The retraction spring (13) acts on a spring lever (14) which can be swiveled relative to the base body (5) about a first swivel axis (15) and relative to the slider (6) about a second swivel axis (16), wherein the first swivel axis (15) is either movable relative to the base body (5) or movable relative to the spring lever (14).

6. The automatic retraction device of claim 5, wherein, The first swivel axis (15) is formed by a journal which is either arranged on the spring lever (14) or on the base body (5) and is movably supported in a spring lever slot (38).

7. The automatic retraction device of claim 6, wherein, The spring lever slot (38) has a curved course.

8. A self-retracting device according to any one of claims 5 to 7, wherein, The retraction spring (13) acts on the spring lever (14) in the region between the first swivel axis (15) and the second swivel axis (16).

9. The automatic retraction device of claim 1 or 2, wherein, The slider (6) has a tilt element (9) which is supported in such a way that it can be swiveled about a tilt axis (10) between an engagement position and a release position, wherein the tilt element (9) is in the engagement position in the home position of the slider (6), in which the entraining element (33) is coupled to the tilt element (9), and is tilted into the release position in the waiting position of the slider (6), in which the entraining element (33) can be decoupled from the tilt element (9), and the tilt element (9) is held by the base body (5) against movement in the pull-out direction (4).

10. A pull-out guide comprising at least two rails movable relative to each other, in which rails a main rail (1) is mountable on a furniture main body (50) and in which rails a pull-out rail (3) is mountable on a pull-out furniture part (51), characterized in that, The pull-out guide has an automatic retraction device according to any one of claims 1 to 9, wherein the base body (5) is arranged on one of the guide rails (1, 3) of the pull-out guide and the entraining element (33) is arranged on the other guide rail (1, 3) of the pull-out guide.

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