EP3897295A1

EP3897295A1 - Self-retracting device

Info

Publication number: EP3897295A1
Application number: EP19835581.0A
Authority: EP
Inventors: Wolfgang Müller; Matthias BECHTER
Original assignee: Fulterer AG and Co KG
Current assignee: Fulterer AG and Co KG
Priority date: 2018-12-21
Filing date: 2019-11-06
Publication date: 2021-10-27
Anticipated expiration: 2039-11-06
Also published as: WO2020124104A1; AT521511B1; PL3897295T3; EP3897295B1; AT521511A4; ES2940569T3

Abstract

The invention relates to a self-retracting device for a furniture part (18) which can be extended out of a furniture body (17) by means of an extension guide, comprising a slide (2) which is movably mounted on a main part (1) and which can be moved in an extension direction (12) from a main position into a standby position against the force of a retracting spring (3), said slide being held in the standby position by a holding device. In order to move the slide (2) from the main position into the standby position, a driver (4) is coupled to the slide (2) and can be uncoupled from the slide (2) in the standby position of the slide (2). The retracting spring (3) engages on a lever (6) which is pivotally mounted on the main part (1) about a first pivot axis (7) and on the slide (2) about a second pivot axis (8), wherein the lever (6) can be moved relative to the first pivot axis (7), or the first pivot axis (7) can be moved relative to the main part (1).

Description

Self-retracting device

The invention relates to a self-retracting device for a furniture part which can be pulled out of a furniture body by means of a pull-out guide, comprising a slide which is displaceably mounted by a base body and which, against the force of a pull-in spring, moves from a basic position into a waiting position

Extending direction is displaceable, in which it is held by a holding device, wherein to move the carriage from the basic position in the

Waiting position a driver is coupled to the carriage and in the

Waiting position of the carriage can be uncoupled from the carriage.

Self-retracting devices of this type are known. Most of these are in

Pull-out guides integrated. For example, WO 2008/1 19091 A1 shows a self-retracting device of this type. A disadvantage with such

Self-retracting devices consists in the fact that the extension of the retracting spring changes over the retracting distance, with the result that at the end of the

Retractable force acting when the carriage is in the area of its

Basic position is significantly lower than the force acting on the carriage in the waiting position when the driver couples to or disconnects from the carriage. The operator perceives the highest force that he has to operate as relevant for ease of use. This highest force occurs when the carriage is in the waiting position (i.e. shortly before the driver is uncoupled when it is pulled out). On the other hand, the force acting on the slide in its basic position, which has the lowest force in such systems, is relevant for the reliable locking of the closed drawer

Displacement of the carriage. The operator is therefore forced to exert a considerably higher force than the reliable one to open the drawer

Locking the drawer is required. In order to keep the increase in force relatively flat, a pull-in spring which is as long as possible is used in the self-retracting device resulting from WO 2008/1 19091 A1, which is deflected by deflecting rollers by a total of 180 ° in order to reduce the required length. Such a deflection leads, among other things, to increased stress on the retraction spring.

The use of constant force springs (also called roller springs) is

basically possible and already known. Constant force springs require a relatively large amount of space and have a comparatively small amount

Lifespan.

WO 2013/138826 A1 shows a closing device in which the driver cooperates not with a sliding carriage but with a closing lever which can be pivoted about a pivot axis and which is acted upon by the drawing spring. By limiting the angle over which the pull lever is pivoted, the driver being a relatively small distance from the axis of the pull lever in the closed state of the pull-out furniture part, in conjunction with a curved slide guide for the pull lever for the driver, the force curve can be adjusted in this way that the closing force near the closed state of the extendable

Furniture part has the highest value. The space required for this

However, the self-retracting device is relatively large and the pull-in distance over which the self-retracting device acts is compared to

Self-retracting devices that use slides are comparatively small.

Another closing device, in which the driver with a

Swiveling pull lever cooperates, is apparent from DE 10 201 1 051 907 A1. The pull-in spring does not act directly on the pull lever but on a further pivotably mounted lever, the connection between the pull lever and the further lever being pivotable on the pull lever and on the other lever attached connecting arm. In this way, the force curve can be adjusted. The disadvantage here is again the required installation space and the relatively small draw-in distance.

The object of the invention is to provide an advantageous self-retracting device of the type mentioned in the introduction, in which an advantageous force profile of the retracting force acting on the driver can be achieved with a relatively large retracting distance and a relatively small installation space. According to the invention, this is achieved by a self-retracting device with the features of claim 1

In the self-retracting device according to the invention, the retracting spring engages on a lever which is mounted on the base body, from which the slide is slidably mounted, pivotably about a first pivot axis and which is pivotally mounted on the slide about a second pivot axis. Here, the lever is displaceable with respect to the first pivot axis or is the first

Swivel axis slidable relative to the base body. Through this

In a compact design, the force profile of the force exerted by the pull-in spring on the slide when it is displaced between the basic position and the waiting position can be influenced in an advantageous manner.

It is advantageously provided here that in the pivot position of the lever about the first pivot axis, which the lever assumes in the basic position of the slide, the lever is displaceable relative to the first

Pivot axis or the first pivot axis has a displaceability relative to the base body in a direction which includes an angle of at most 85 °, preferably of at most 80 ° with the direction of extension. A reduction caused by the lever of the force exerted on the slide by the pull-in spring can thereby be reduced in the area of the basic position of the slide, so that the force acting on the slide in the area of the basic position of the slide compared to a conventional design of the

Self-retracting device is raised, as in the description of the figures will be explained in more detail. For example, one can at least use the

Most of the draw-in distance at least approximately constant force acting on the slide can be achieved, despite the different extension of the draw-in spring.

The first pivot axis can advantageously be from one on the base body

attached axle bolt, which is slidably mounted in a link of the lever, or formed by an axle bolt attached to the lever, which is slidably mounted in a link of the base body. In the basic position of the

This slide of the lever or of the base body slides, at least in a section in which the axle pin is located, obliquely to the pull-out direction, thus enclosing an angle unequal to 90 ° with the pull-out direction. This angle is advantageously in the range from 50 ° to 85 °, preferably in the range from 65 ° to 80 °.

The backdrop of the lever or the base body can be designed with a curved course. This enables a further adjustment of the spring force acting on the slide.

In an advantageous embodiment of the invention it is provided that the pull-in spring acts on the lever in the region between the first and the second pivot axis. The lever on which the pull-in spring engages is therefore a one-armed lever. This contributes to the saving of installation space.

The coupling of the carriage to the driver is preferably carried out via a tilting part which is arranged on the carriage and can be tilted about a tilt axis. In a

Holding position of the tilting part of the driver is held in an intermediate space of the tilting part. In a release position of the tilting part, which the tilting part in the

When the carriage is in the waiting position, the driver can move out of or into the intermediate space.

The pivoting of the tilting part about the tilting axis can be done in particular by means of a Guide pin, which in a tilting part of the base body of the

Self-retracting device engages, be controlled. Due to the interaction of the guide pin with a bent section of the tilting part guide link, the holding device can also be designed to hold the slide in the waiting position in the uncoupled state of the driver.

Such training is fundamentally known, for example from the prior art mentioned in the introduction to the description. Another possibility for coupling and uncoupling the driver to the slide and for forming the holding device would be, for example, that the slide as a whole is guided by a slide guide of the base body and the slide then follows a linear displacement, which starts from the basic position to in the The carriage is near the waiting position about an (imaginary) axis

is pivoted, whereupon the driver can decouple. Such slides are also known as tilting slides.

Other designs of the holding device are basically conceivable and possible. For example, a holding device could hold the carriage in its waiting position by magnetic force.

The self-retracting device is advantageously integrated in a pull-out guide. The base body is advantageously arranged on the body rail and the driver on the pull-out rail.

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

Fig. 1 integrated into a pull-out guide self-retracting device according to

a first embodiment of the invention in the inserted state of the pull-out guide;

Fig. 2 is an oblique view corresponding to Fig. 1, in the uncoupling and coupling position of the pull-out guide, in which the driver when pulling out of the slide uncoupled and coupled to the slide when pulling in, i.e. in the

Waiting position of the sledge;

Fig. 3 is an oblique view corresponding to Fig. 1 in the extended state of the

Pull-out guide;

Fig. 4 is an end view;

Fig. 5, 6 and 7 oblique views of the rails removed from each other;

8 is an oblique view of the pull-out rail from the opposite side;

FIG. 9 shows an enlarged detail B from FIG. 8;

10 shows a section along the line AA from FIG. 4 in the inserted state of the pull-out guide, that is to say in the basic position of the slide;

11 shows a section analogous to FIG. 10 in an intermediate position of the slide;

12 shows a section corresponding to FIG. 10 in the decoupling and coupling position of the pull-out guide, that is to say in the waiting position of the slide;

13 shows a section along the line CC from FIG. 4 in the inserted state of the pull-out guide, that is to say in the basic position of the slide;

14 shows a section corresponding to FIG. 13 in the decoupling and coupling position of the pull-out guide, that is to say in the waiting position of the slide;

15, 16 and 17 oblique views of the self-retracting device in the basic position of the slide, in an intermediate position of the slide and in the

Waiting position of the sledge;

18, 19 and 20 oblique views of the self-retracting device from a different viewing direction in the positions of the slide corresponding to FIGS. 15, 16 and 17;

21, 22 and 23 oblique views of the self-retracting device from the viewing direction corresponding to the oblique views of Fig. 15, 16 and 17 and in the

Positions of the slide corresponding to Figures 15, 16 and 17, with only the base body being cut along the line AA of Figure 4;

24 is an end view of the self-retracting device;

25, 26 and 27 sections along the line DD of FIG. 24 in the positions of the slide corresponding to FIGS. 15-17;

28 and 29 exploded views from different viewing directions;

30, 31 and 32 are highly schematic representations of parts of a self-retracting device according to the invention according to the first embodiment of the invention for explaining the functional principle, in the basic position of the slide, an intermediate position of the slide and the waiting position of the slide;

33 to 41 representations of a second embodiment of the invention

analogous to Figures 1 to 9 of the first embodiment of the invention;

FIG. 42 shows a section along the line EE from FIG. 36 in the inserted state of the pull-out guide, that is to say in the basic position of the slide (the pull-in spring and the damper are shown uncut);

43 shows a section analogous to FIG. 42 in the decoupling and coupling position of the

Extending guide, ie in the waiting position of the sled;

44 to 49 representations analogous to FIGS. 15-20 of the first exemplary embodiment of the invention;

50 to 52 oblique views corresponding to FIGS. 44-46 and in the positions of the slide corresponding to FIGS. 44-46, only the base body being cut along the line FF in FIG. 36;

53 shows an end view of the self-retracting device;

Fig. 54 to 56 sections along the line GG of Fig. 53 in the positions of the

Slide according to Figs. 44-46;

57 and 58 are exploded views of the self-retracting device

different viewing directions;

Fig. 59, 60 and 61 highly schematic representations of parts of a

self-retracting device according to the invention according to the second embodiment of the invention in the basic position of the slide, an intermediate position of the slide and the waiting position of the slide to explain the principle of operation.

A first embodiment of the invention is in detail in FIGS. 1-29

shown. 30-32 show the principle of operation in a simplified and schematic manner.

30-32 is a self-retracting device with a base body 1 and one which is displaceably mounted on the base body 1 parallel to the pull-out direction 12 Carriage 2 shown schematically. The carriage 2 can be displaced from a basic position into a waiting position via a displacement path. 30, the carriage 2 is in the basic position, in which it is acted upon by a pull-in spring 3. The carriage 2 is coupled to a driver 4, in the exemplary embodiment via a tilting part 5, which is in a folded position in the basic position of the carriage 2.

The base body 1 is usually rigidly connected to the furniture body and the driver 4 is rigidly connected to the pull-out furniture part, an inverted arrangement also being possible. In particular, the base body 1 on one

Body rail of a pull-out guide can be attached, the body rail being attached to the furniture body and the pull-out guide further on

pull-out furniture part attached pull-out rail. The driver 4 can advantageously be arranged on the pull-out rail.

A lever 6 is mounted on the base body 1 so as to be pivotable about a first pivot axis 7. The lever 6 is on the carriage 2 about a second pivot axis 8

pivoted. The pull-in spring 3 acts on this lever 6, in the exemplary embodiment in the region between the first and the second

Swivel axis 7, 8.

The force F exerted by the pull-in spring 3 is thus transmitted to the carriage 2 via the lever 6. The first lever arm s, which acts between the point of application of the pull-in spring 3 and the first pivot axis 7, is also shown, as is the second lever arm s ₂ , via which the force F exerted by the pull-in spring 3 is transmitted to the slide 2. The first lever arm s is the normal distance between the point of application of the retraction spring 3 on the lever 6 and a straight line 9 which runs parallel to the force F through the first pivot axis 7. The second lever arm s ₂ is the normal distance between the second pivot axis 8 and the straight line 9.

The force F exerted on the carriage 2 by the retraction spring 3 is thus determined by the Lever 6 stepped down, that is to say transferred to the carriage 2 in the ratio s / s ₂ .

Since the point of application of the retraction spring 3 on the lever 6 and the point of application of the lever 6 on the slide 2 (= second pivot axis 8) are on the same side of the first pivot axis 7, the exemplary embodiment is a

one-armed lever.

The lever 6 is displaceable with respect to the first pivot axis 7. For this purpose, in the exemplary embodiment, an axle bolt 10 which is fixed to the base body 1 and is slidably mounted in a link 11 of the lever 6 is provided. The backdrop 1 1 is formed in the embodiment of an elongated hole in the lever 6. For example, the setting 11 could also be formed by an undercut groove, in which a head of the axle pin 10 engages.

If the pull-out furniture part is pulled out starting from an inserted state, the driver 4 is moved in a pull-out direction 12, taking the slide 2 with it from the basic position of the slide 2 (FIG. 30) in the pull-out direction 12, specifically against that of the pull-in spring 3 force exerted on the carriage 2. 31 shows an intermediate position of the carriage 2 between the basic position of the carriage 2 and the waiting position of the carriage 2. In Fig. 32, the carriage 2 takes the waiting position. In this

The driver 4 can decouple the waiting position from the carriage 2. in the

Exemplary embodiment is the tilting part 5 with respect to the slide 2 about a tilting axis 13 with respect to a holding position, which the tilting part 5 in the

Basic position of the carriage 2 occupies, pivoted into a release position. In the release position of the tilting part 5, the driver 4 can extend from a recess 14 in the tilting part 5, in which it is held in the holding position of the tilting part 5.

After the driver 4 has been uncoupled from the carriage 2, the carriage 2 is held in the waiting position by a holding device, as is known.

For example, the holding device can be formed by a guide for the tilting part as will be explained below with reference to FIGS. 1-29. A

Holding device could, for example, also be brought about by magnetic force, it being possible for a magnet to be arranged on the base body 1 and / or slide 2.

When the pull-out furniture part is inserted again, the driver 4 moves into the recess of the tilting part 5 and pivots it back into the

Stop position. In this way or in another way by the retracting driver (for example by loosening the magnetic holder by the retracting driver

Carrier), the holding device is released and the carriage 2 is drawn in by the pull-in spring 3 to the basic position, taking the carrier 4 and thus the pull-out furniture part with it.

In the basic position of the slide 2 and the corresponding position of the lever 6, the link 11 is at an angle to the pull-out direction 12, so the center line of the link (which runs in the direction of the longitudinal extension of the link) has an angle 16 unlike 90 ° with respect to the pull-out direction 12 . The lever 6 thus has, in the position which it occupies in the basic position of the carriage 2, a displaceability relative to the axle pin 10, that is to say with respect to the first pivot axis 7, in a direction 15 which includes an angle 16 not equal to 90 ° with the pull-out direction 12 . The angle 16 is preferably at most 85 ° and at least 50 °, particularly preferably the angle 16 is at most 80 ° and at least 65 °.

The force F exerted by the retraction spring 3 on the lever 6 is in the

Basic position of the slide 2, in which the pull-in spring 3 is less tensioned, is smaller than in the waiting position of the slide 2. However, the force of the pull-in spring 3 transmitted to the slide 2 in the basic position is increased.

When moving the carriage 2 between the basic position and the

Waiting position there is a superimposition of two movements, on the one hand to a pivoting of the lever 6 about the first pivot axis 7 and on the other hand to a displacement of the lever 6 with respect to the first

Swivel axis 7, the direction 15 of this displacement depending on the respective position of the carriage. When the carriage 2 is displaced from the basic position in the direction of the waiting position, in addition to pivoting the lever about the first pivot axis 7, the lever 6 is displaced in a direction 15 with respect to the first pivot axis 7 in a direction 15 over a first section a includes an angle 16 with the pull-out direction 12, which is less than 90 °. The first section a ends at the intermediate position shown in FIG. 31, in which the connecting line of the first

Pivot axis 7 with the second pivot axis 8 is perpendicular to the pull-out direction 12. During the further displacement over the second section b from the intermediate position to the waiting position of the carriage 2, the lever 6 moves in an opposite direction with respect to the first pivot axis 7, which includes an angle greater than 90 ° with the direction of extension 12.

Starting from the basic position of the slide 2, the intermediate position of the slide 2 is in the range from 30% to 80% of the total displacement path of the slide 2.

If one assumes that the backdrop 11 would lie parallel to the pull-out direction 12, then when the carriage 2 was moved, there would be no pivoting of the lever 6 but only a displacement of the lever 6 with respect to the first pivot axis 7. The force of the pull-in spring 3 would thus be transferred 1: 1 to the slide 2 over the entire displacement path when the slide 2 was pulled in from the waiting position into the basic position. In the case of a backdrop 1 which is at an angle to the pull-out direction 12, that at least over part of the

Displacement comes to a displacement of the lever 6 with respect to the first pivot axis 7, in which the lever has a movement component opposite to the pull-out direction 12, this reduces

Movement component the reduction of the force exerted by the retraction spring 3 on the lever 6 on the carriage 2. This reduction in gear is therefore effective over the previously mentioned section a (when pulling in as well as when pulling out). By reducing the reduction, the force transmitted to the slide 2 via the lever 6 is increased. The lower spring force of the retraction spring 3 in the basic position of the carriage 2 compared to the waiting position of the carriage 2 can thus be reduced by the previously described

Reduction in the vicinity of the basic position of the carriage 2 can be counteracted.

In addition, when the carriage 2 is shifted from that shown in Fig. 31

Intermediate position shown in the basic position, ie over the section a, to an increase in the distance of the first pivot axis 7 from the point of engagement of the retraction spring 3 and from the second pivot axis 8, and thus to one

Enlargement of both s and s ₂ , the value of the ratio s, / s ₂ increasing, ie the reduction becomes lower, which additionally reduces the overall reduction.

The value of the ratio s / s ₂ also increases, ie the reduction is reduced, via the second partial distance b, which adjoins the first partial distance a and extends from the intermediate position of the slide shown in FIG. 31 to the waiting position of the slide. On the other hand, the reduction is increased by the fact that the lever 6 is displaced in a direction 15 which includes an angle greater than 90 ° with the pull-out direction 12, that is to say has a component opposite to the movement in the pull-out direction, cf. Fig. 32. Overall, an increase in the pull-in force of the carriage can be achieved over the last section of the displacement path of the carriage towards the waiting position of the carriage.

Due to the inventive design, the on the carriage 2 in the

Basic position acting force exerted by the pull-in spring 3 can thus be raised. The force acting on the slide 2 by the retraction spring 3 can also be greater in the basic position than in a central region of the

Sliding path of the slide. 30-32, the course of the backdrop 11 is shown in a straight line. The curve of the force acting on the slide 2 via the displacement path can be further modified by a curved configuration of the link 11 by one

to achieve the desired force curve. In particular, the link 11 can be curved in such a way that its center line starts at the point of application of the retraction spring

Base body 1 is concave as seen from.

A specific embodiment of the invention is shown in detail in FIGS. 1-29. The self-retracting device is integrated in a pull-out guide. In the exemplary embodiment shown, the pull-out guide comprises one on one

Furniture body 17 attachable body rail 19, one on an extendable

Furniture part 18 extendable pull-out rail 20 and a middle rail 21 arranged between the carcass rail 19 and the pull-out rail 20. In the exemplary embodiment shown, the rails 19-21 are displaceably guided

Rollers 22. These rollers 22 are all in the embodiment

Center rail 21 is arranged, whereby a differential pull-out guide is formed here.

A pull-out guide, in which a self-retracting device according to the invention is integrated, could also be designed in a different way, for example, rolling elements mounted in cages for mutually displaceable mounting of the rails, or also without a central rail (s).

The pull-out furniture part 18 can be a drawer, for example. The pull-out furniture part 18 and the furniture body 17 are only indicated schematically in FIG. 4 by dashed lines.

The base body 1 of the self-retracting device is fixed to the body rail, specifically in the region of the rear end of the body rail in relation to the pull-out direction 12. The carriage 2 is mounted displaceably from the base body 1 parallel to the pull-out direction 12, specifically between the basic position (cf. FIGS. 10, 13, 15, 18, 21, 25) and the waiting position (see FIGS. 12, 17, 20, 23 and 27). On the slide 2, the tilt member 5 is pivotally mounted about the tilt axis 13. In the basic position of the slide 2, the tilting part 5 assumes a stop position with respect to its pivoting about the tilt axis 13, and in the waiting position of the slide 2 a

Release position. The pivoting of the tilting part 5 during the displacement of the carriage 2 from the basic position into the waiting position is carried out by guide pins 23, 24 arranged on the carriage 2, which interact with a tilting part guide link 25 of the base body 1, cf. particularly Figures 10-12 and 21-23. The

Tilt part guide link comprises two guide webs, one of which

Guide pin 23 is guided between them and the other of the guide pin 24 cooperates with an outer surface of one of the guide webs. The lower guide web of the tilting part guide link 25 is free in the region of the front end of the tilting part guide link 25, whereby the

Guide pin 23 can be inserted into the space between the two guide webs during assembly.

Starting from the area in which the guide pins 23 are in the basic position of the slide 2, the tilting part guide link 25 initially runs in a straight line. Before reaching the waiting position of the carriage 2, the

Guide pin 23, 24 when pulling out the pull-out guide a bent area of the tilting part guide link 25, whereby the tilting part 5 of the

Holding position is pivoted into the release position about the tilt axis 13. The curved part of the length of the tilting part guide link 25 can be in the range of 15% to 40%, preferably 20% to 30% of the total length of the tilting part guide link 25 (the lengths being measured along the guide path formed by the guide link).

In the holding position of the tilting part 5, the driver 4, which is formed here by a projecting web section at the rear end of the pull-out rail 20, is held in a recess in the tilting part 5, as can be seen in particular in FIG. 13. When pulling out the pull-out rail 20 starting from

the slide 2 is thus initially inserted taken and moved against the force of the retraction spring 3 from the basic position in the direction of the waiting position. In a decoupling and coupling position of the pull-out rail, in which the slide has reached the waiting position, the tilting part 5 is pivoted into the release position, in which the driver 4 can extend from the recess of the tilting part 5, cf. Fig. 14 in particular. When the pull-out rail is extended further, the slide 2 remains in the

Waiting position, in which it is held by the interaction of the guide pin 24 with the bent area of the tilting part guide link 25, the tilting part guide link 25 can be in the area in which the

Guide pin 24 is in the waiting position of the carriage 2, have a small indentation (not recognizable in the figures). In this way, a holding device for the carriage 2 is formed when the carriage 2 is in the waiting position and the driver is decoupled from the carriage 2.

If the pull-out rail 20 is pushed in again, the driver 4 abuts the tilting part 5 in the uncoupling and coupling position of the pull-out rail 20 and pivots this in the direction of its holding position. The self-locking of the guide pin 24 with respect to the tilting part guide link 25 is thereby eliminated and the pull-in spring 3 subsequently pulls the slide 2 back into its basic position, the pull-out rail 20 being taken along.

A damper 26 is coupled to the slide 2. This dampens the

Retraction movement of the carriage 2 by the retraction spring 3.

The pull-in spring 3 engages the lever 6. This is mounted on the base body 1 so as to be pivotable about the first pivot axis 7, being opposite the first

Swivel axis 7 is displaceable. The first pivot axis 7 is formed by the axle bolt 10, which engages in the link 11 formed by an elongated hole of the lever 6, cf. in particular FIGS. 10 to 12 and 24 to 27.

Furthermore, the lever 6 is on the carriage 2 about the second pivot axis 8

pivoted. The pull-in spring 3 engages between the first and the second pivot axis 7, 8 on lever 6 and is at the other end on the base body

1 held.

The backdrop 11 has a curved course, i.e. the center line 27 of the backdrop, which is shown in FIGS. 25-27, is curved. If at the point at which the axle pin 10 is in the basic position of the slide 2, a tangent is applied to the center line 27 (this tangent is shown as a dashed line in FIG. 10), then the direction 15 lies in which the lever 6 moves relative to the first pivot axis 7 at the beginning of the displacement of the carriage 2, starting from its basic position in the direction of its waiting position, on this tangent. The angle 16 that the direction 15 with the

Extending direction 12 includes, in the embodiment is approximately 70 °. Thus, about 30% of the force exerted by the retraction spring 3 parallel to the pull-out direction 12, resulting from tan (20 °), is transmitted directly parallel to the pull-out direction 12 and opposite to it. Since the force acting in the sense of a rotation of the lever 6 about the first pivot axis 7 from the pull-in spring 3 on the lever 6 is reduced by the lever 6 in the exemplary embodiment in the order of magnitude of 1: 3, this is 1 1 due to the inclined position of the link caused

Force increase in the area of the basic position of the slide 2 considerably (greater than 50%). In particular in connection with the curved course of the backdrop 1 1, taking into account also the changing lever arms during the

Displacement of the carriage 2 between the basic position and the waiting position a largely constant course of the spring force acting on the carriage 2 can be achieved when pulling out the pull-out guide and when pulling out the pull-out guide.

The center line 27 of the backdrop 11 is concave as seen from the point of application of the retraction spring 3 to the base body 1, cf. e.g. 25 to 27.

As already mentioned, the tilting part guide link 25 then runs to the point at which the guide pins 23, 24 are in the basic position of the slide

Find 2, initially straight. There is a center line of the tilting part guide link in this area of the tilting part guide link on a straight line 28 (cf. FIG. 12). The pivoting of the tilting part 5 in the last part of the displacement path of the

Carriage 2 from the basic position to the waiting position is guided by the interaction of the guide pin 23 with the tilting part guide link 25. Of the

Guide pin 23 is guided in the end region of the tilting part guide link 25 along a circular path, i.e. the center line of the tilting part guide link 25 lies on an arc of a circle, the center point 29 of which is indicated in FIG. 12 by a cross. The normal distance of the center 29 from the straight line 28 is greater than the normal distance of the tilt axis 13 from the straight line 28. This causes the tilting part 5 to be pivoted over a somewhat larger one

Section of the movement of the carriage 2 takes place. Thus, the slide 2 does not start jerkily but gradually when the pull-in rail is pushed in after the coupling of the driver 4 to the tilting part 5.

The carriage 2 also has a projection 32 which forms a stop for the central rail 21 when the pull-out rail 20 is opposite the

Center rail 21 is moved too far in the pull-out direction 12.

In the exemplary embodiment of the invention shown, the lever 6 is supported on the vertical web of the body rail 19 by means of knobs which are visible in particular from FIGS. 18-20 and 28.

A second embodiment of the invention is shown in detail in Figs. 36-56. 59-61 show the operating principle in a simplified and schematic manner. The differences from the first exemplary embodiment are explained in particular below. Unless otherwise described, the description of the first exemplary embodiment can be used in an analogous manner. For

corresponding parts, the same reference numerals are used.

Referring first to FIGS. 59-61, in a manner analogous to that in the first exemplary embodiment, a slide 2 is slidably mounted on the base body 1 of the self-retracting device parallel to an extraction direction 12. The carriage 2 is between the basic position (Fig. 59) and the waiting position (Fig. 61)

Tilting part 5 coupled to a driver 4. In the waiting position of the slide (Fig. 61), the driver 4 can uncouple from the slide 2 (when pulling out the pull-out furniture part) or to the slide 2 (when pushing in the pull-out furniture part).

In order to hold the slide in the waiting position after the driver 4 has been uncoupled against the force of the pull-in spring 3, a holding device is used, which can be designed in a manner analogous to that in the first exemplary embodiment by a link guide of the tilting part 5 relative to the base body 1 (not shown in FIGS Fig. 59-61).

The retraction spring 3 is attached to the base body 1 at one end and engages the lever 6 at the other end. The lever 6 is pivotally connected to the base body 1 about a first pivot axis 7 and pivotally connected to the carriage 2 about a second pivot axis 8. The pull-in spring 3 engages in

Embodiment again on the lever 6 between the first and the second pivot axis 7, 8.

The first pivot axis 7 is formed by an axle bolt attached to the lever 6, which engages in a link 30 of the base body 1. The backdrop 30 is formed here by an elongated hole. The first pivot axis 7 is thereby displaceable relative to the base body 1, specifically in the direction of the longitudinal extension of the link 30. The link 30 is inclined to the direction of extension. When the carriage starts from the basic position (Fig. 59) towards the waiting position

is shifted, so there is a displacement of the first pivot axis 7 in a direction 15 over a first section a of the displacement path, which includes an angle 16 with the link 30, which is preferably in the range of 85 ° to 50 °, particularly preferably in the range of 80 ° to 65 °.

In a manner analogous to that in the first exemplary embodiment, a combined movement occurs when the carriage is displaced over the partial distance a of the lever 6, namely for pivoting about the first pivot axis 7 and for a displacement which has a component parallel to the pull-out direction 12. When the carriage 2 is pulled in by the pull-in spring 3, the force exerted by the pull-in spring 3 is reduced with respect to the movement component of the pivoting about the first pivot axis 7 in accordance with the ratio of the lever arms ss. With regard to the movement component parallel to the pull-out direction, the component of the force exerted by the pull-in spring in this direction is transferred 1: 1 to the lever 6. The reduction s ₂ / s is quasi reduced.

The section a runs from the basic position of the carriage 2 to the position of the carriage 2, in which the connecting line between the pivot axes 7, 8 is at right angles to the direction of extraction 12. This position of the carriage 2 is reached just after the intermediate position shown in FIG. 60. In the further course of the displacement of the carriage 2 in the direction of the waiting position (which is shown in FIG. 61), the displacement of the first pivot axis 7 with respect to the link 30 takes place opposite to the direction 15. The force of the

Retraction spring 3 is quasi further reduced thereby. Overall, the force exerted by the pull-in spring 3 on the slide 2 can be compared to a direct attack by the pull-in spring on the slide

constant force curve can be adjusted.

The ratio of the lever arms s / s ₂ does not change in this embodiment over the displacement of the carriage 2.

59 to 61, the longitudinal extent of the backdrop 30 is shown in a straight line. In order to further align the force profile of the force exerted by the pull-in spring 3 on the slide 2 to a desired force profile, the link 30 can have a curved profile.

33 to 56 show one with an inventive

Self-retracting device according to the second embodiment equipped pull-out guide in detail. In an analogous manner as in the first embodiment the pull-in device is attached to the carcass rail 19 and the pull-out rail 20 has the driver 4. A middle rail 21 can be arranged between the carcass rail and the pull-out rail and the mutually displaceable guidance of the rails can take place via rollers 22, which in turn are all arranged here on the central rail, a differential pull-out guide being formed. The furniture body 17 and the pull-out furniture part 18 are only indicated with dashed lines in FIG. 36.

In the exemplary embodiment, two retraction springs 3 are provided which each act on the base body 1 on the one hand and on the lever 6 on the other hand. As explained in principle above with reference to FIGS. 59-61, the lever 6 is mounted such that it can pivot about a first pivot axis 7 relative to the base body and about a second one

The pivot axis 8 is pivotally mounted relative to the slide 2, the first pivot axis 7 being displaceable relative to the base body 1, in that an axle bolt 31 attached to the lever 6 is displaceably guided by the link 30 of the base body 1. The backdrop 30 is not only at an angle here

Extending direction but also has a curved course, the

The center line 27 of the link 30 in this embodiment has a convex shape as seen from the point of application of the retracting springs 3 on the base body 1, cf. especially Figs. 54-56. The axle pin 31 thereby arrives in an area that extends around the position of the slide 2 in which the

Connection line between the first and the second pivot axis 7, 8

is perpendicular to the pull-out direction 12, in a section of the link 30 in which it has a greater oblique position with respect to the pull-out direction 12 than in the section assigned to the end positions of the slide 2. The change in the reduction due to the inclined position of the link 30 can thereby be increased in the area of a middle position of the slide 2.

The guidance of the tilting part 5 relative to the base body 1 by means of the tilting part guide link 25 of the base body 1, into which a guide pin 23 of the

Tilting part 5 engages, is best seen in Figs. 50-52. Fig. 50 shows the basic position of the carriage 2, in which the tilting part 5 is in the holding position is located and the driver 4 is coupled to the slide 2 via the tilting part 5. The inclusion of the driver 4 in the recess of the tilting part 5 is best seen in FIG. 42. Fig. 51 shows the position of the carriage in which

Pulling out the pull-out guide the pivoting of the tilting part 5 about the tilting axis 13 begins. 52, the waiting position of the carriage 2 is reached, in which the driver 4 can move out of the recess of the tilting part 5, cf. Fig. 43.

Due to the interaction of the guide pin 23 with the bent end section of the tilting part guide link 25, the slide 2 is held in the waiting position against the force of the pull-in spring 3 when the driver 4 is uncoupled from the slide 2.

If the driver 4 approaches the tilting part 5 when the pull-out rail 20 is pushed in, the tilting part 5 is moved about the tilting axis 13 from the release position into

Swiveled in the direction of the folded position, the driver 4 moving into the recess of the tilting part 5 and the driver 4 thereby coupling via the tilting part 5 to the slide 2 and further the guide pin 23 from the

bent region of the tilting part guide link 25 is moved so that the self-locking of the carriage 2 is canceled. The retraction spring 3 can thus pull the carriage 2 into the basic position. This retraction is damped by the damper 26 connected to the carriage 2.

The self-retracting device also has a “malfunction healing mechanism” in the event that the slide is already in the basic position when the retracting guide is inserted. In this case, the driver 4 runs against an inclined surface 33 of a projection 32 of the tilting part 5, which makes it presses two parts of the tilting part lying against each other in this area against the material elasticity and a gap for moving the driver 4 into the

Recess of the driver 4 is opened. Legend

to the reference numbers:

Base body 29 center

Sled 30 backdrop

Retraction spring 31 axle bolts

Driver 32 lead

Tilting part 33 inclined surface

lever

first pivot axis

second pivot axis

Straight

Axle bolt

Backdrop

Pull-out direction

Tilt axis

Recess

direction

angle

Furniture body

extendable furniture part

Body rail

Pull-out rail

Middle rail

Roller

Guide pin

Tilt part guide link

mute

Center line

Straight

Claims

1 . Seibstein puller for one by means of a pull-out guide from one

Furniture body (17) extendable furniture part (18), comprising a slide (2) which is displaceably mounted by a base body (1) and which can be displaced from a basic position into a waiting position in a pull-out direction (12) against the force of a pull-in spring which he through a

Holding device is held, for moving the carriage (2) from the basic position to the waiting position a driver (4) is coupled to the carriage (2) and can be decoupled from the carriage (2) in the waiting position of the carriage (2),

characterized in that the pull-in spring (3) acts on a lever (6) which on the base body (1) about a first pivot axis (7)

is pivotally mounted and is pivotally mounted on the carriage (2) about a second pivot axis (8), the lever (6) being displaceable relative to the first pivot axis (7) or the first pivot axis (7)

is displaceable relative to the base body (1).

2. Seibsteinziehvorrichtung according to claim 1, characterized in that based on the pivot position of the lever (6) about the first pivot axis (7), which the lever (6) in the basic position of the carriage (2), the lever (6) one Slidability with respect to the first pivot axis (7) or the first pivot axis (7) with respect to the

Has base body (1) in a direction (15) which includes an angle (16) of at most 85 °, preferably of at most 80 ° with the pull-out direction (12).

3. Seibstein pulling device according to claim 2, characterized in that the angle (16) is at least 50 °, preferably at least 65 °.

4. Self-retracting device according to one of claims 1 to 3, characterized in that the first pivot axis (7) is formed by an axle bolt (10) attached to the base body (1) which is displaceable in a link (11) of the lever (6) is stored, or by a lever (6)

attached axle bolt (31) is formed, which is slidably mounted in a link (30) of the base body (1).

5. Self-retracting device according to claim 4, characterized in that the backdrop (1 1, 30) has a curved course.

6. Self-retracting device according to claim 5, characterized in that the center line (27) of the link (1 1) of the lever (6) from the point of application

Retraction spring (3) on the base body (1) is concave or the center line (27) of the link (30) of the base body (1) is convex when viewed from the point of application of the retraction spring (3) on the base body (1).

7. Self-retracting device according to one of claims 1 to 6, characterized

characterized in that the pull-in spring (3) acts on the lever (6) in the region between the first and the second pivot axis (7, 8).

8. Self-retracting device according to one of claims 1 to 7, characterized

characterized in that the holding device has a tilting part (5) which is pivotably mounted on the slide (2) about a tilt axis (13), the driver (4) in the state coupled to the slide (2) in a

Recess in the tipping egg! (5) engages and wherein the base body (1) has a tilting part guide link (25), from which a guide pin (23, 24) of the tilting part (5) is guided, from which when the carriage (2) is moved from the basic position into the waiting position is the pivoting of the tilting part (5) about the tilting axis (13).

9. Self-retracting device according to claim 8, characterized in that a center line of the tilting part guide link (25) over a main portion of the tilting part guide link (25) starting from the point at which the guide pin (23, 24) is in the basic position of the slide (2) is located on a straight line (28) and lies on a circle over an end section of the tilting part guide link (25), in which the guide pin (23, 24) is located when the carriage (2) reaches the waiting position whose center (29) has a larger normal distance from the straight line (28) than the tilt axis (13) of the tilt part (5).

10. pull-out guide comprising at least two mutually displaceable rails, of which a body rail (19) on a furniture body (17) and of which a pull-out rail (20) can be attached to a pull-out furniture part (18), characterized in that the pull-out guide is a self-retracting device one of claims 1 to 9, wherein the base body (1) is arranged on one of the rails (19, 20) of the pull-out guide and the driver (4) on another of the rails (19, 20) of the pull-out guide.