EP3518707B1 - Retraction device for a drawer pullout - Google Patents

Description

Technical area

The invention relates to a pull-out drawer with a fixed rail element for attachment to a furniture body and at least one movable rail element mounted thereon, comprising an inner rail as the innermost movable rail element for attachment to an extendable furniture part. The drawer extension includes a retraction device with a spring-loaded slide movable in the retraction / extension direction for temporary coupling to elements arranged in the area of the free end of the inner rail, the slide being in a retraction position by a locking slide that is movable in a guide transversely to the retraction / extraction direction can be blocked, wherein the carriage has at least one pivot element for coupling to the elements of the inner rail, which is pivotable about an axis oriented perpendicular to the pull-in / pull-out direction and perpendicular to the direction of movement of the locking slide, and a geometry of the pivot element corresponds to a geometry in the area of the free The end of the inner rail arranged elements is adapted.

State of the art

Drawer pull-outs are known which comprise a fixed rail element for attachment to a furniture body and at least one movable rail element mounted thereon. The innermost movable rail element, the inner rail, is attached to an extendable piece of furniture. Depending on the length of the drawer extension and the extension length, further movable rail elements can be arranged between the fixed rail element and the inner rail, which cooperate telescopically. The rail elements are mounted on one another, for example by means of ball or roller guides.

Drawer pull-outs are generally suitable for storing pull-out furniture parts; for the sake of simplicity, the term "drawer" is used in each case in the following. The draw-in devices described are, however, basically suitable for various pull-out furniture parts. As a rule, a pull-out is arranged on both sides of a drawer.

Retraction devices for drawer extensions automatically guide the drawer into its end position when it is pushed in. This improves the usability of the drawer, and the generation of noise when it is closed can be minimized. Known draw-in devices grasp the inner rail and guide it along part of the closing movement from a standby position of the draw-in device to the closed state.

From the DE 11 2008 001 880 T5 (Accuride International Inc.), for example, a draw-in device is known which comprises a movable slide on which a bolt is rotatably arranged for cooperation with the inner rail.

In the case of furniture with several drawers arranged one below the other, simultaneous pulling out of several drawers should often be prevented, in particular in order to avoid the risk of tipping over due to several heavy pulled out drawers and the risk of injury from trapping parts of the user's body. In this context, it is known to provide locking slides which are coupled to the drawer pull-outs and prevent another drawer from being pulled out when a drawer has already been fully or partially pulled out.

The DE 20 2009 000050 U1 (Paul Hettich GmbH & Co. KG) discloses a locking system of an extendable furniture part with a second driver which is mounted displaceably in a housing and which can be coupled to a second activator; the second driver is in operative connection with a locking bar for locking several pull-out furniture parts arranged one above the other. There is also a first activator and a first driver which can be coupled to one another; the first driver is in engagement with functional elements; When the furniture part is pulled out, this allows activation of both the lock for further furniture parts and a self-pulling-in or pushing-out process. The second driver is arranged displaceably and pivotably on the housing; a tension spring is attached to this, which pulls it in a direction in which the second driver is located when the furniture part is in the retracted position. The device also includes an ejection device. When ejecting a pin located on the second driver is pushed between two sliding parts of the locking bar, these have an edge partially parallel to the pull-out direction, which are formed with a slope along which the pin can slide during opening.

The DE 10 2012 109 751 A1 (Paul Hettich GmbH & Co. KG) describes a pull-out drawer with a self-closing or ejecting device that has a slidably mounted driver with which the pull-in or ejecting device can be activated. For this purpose, an activator interacts with the driver, which is arranged on a sealing plug attached to the front end of the inner rail. The driver also has a pin for engaging a locking bar for locking and unlocking several drawers arranged one above the other.

These excerpts have a complex construction with many parts. Given the mechanical requirements for the pull-out, the production costs are correspondingly high. The construction does not make sense for a version without ejection functionality.

The US 2008/061663 A1 (Che-Tsung Wu ) describes a combination of a pull-in and locking device. The pull-in device and the locking device are arranged on an outer rail of the drawer slide; the retraction device comprises a pivotable and movably mounted element in the pull-out direction, which interacts with a counterpart on the inner rail of the drawer slide. The locking device is arranged independently of the retraction device at the rear end of the outer rail.

The device is structurally integrated into the drawer guide, which reduces the space requirement. Nevertheless, there is still a relatively large amount of space required for the draw-in device and the locking device that is independent of it, and the device is still constructed in a relatively complex manner.

Presentation of the invention

The object of the invention is to create a drawer extension belonging to the technical field mentioned at the beginning, which is simply constructed and mechanically robust.

The solution to the problem is defined by the features of claim 1. According to the invention, the pivot element and the guide are arranged in such a way that the locking slide blocks a pivoting movement of the pivot element in a blocking position.

Apart from the elements that are already present, namely the locking slide and the swivel element, no further components are necessary. This results in a simple structure. This results in low costs and high mechanical stability.

The pull-in device is attached in particular to the fixed rail element. The spring means coupled to the slide can be a single, linear one extending helical spring, a helical spring deflected by 180 ° along an arc or several helical springs arranged in parallel. There are also other spring means, e.g. B. coil or torsion springs, conceivable.

The interaction between the inner rail and the pivot element takes place via elements such as projections, pins or recesses arranged in the region of the free end of the inner rail, the geometry of the pivot element being adapted to the geometry of these elements. The elements on the inner rail can be formed in one piece with this or can be fixedly or detachably attached to it.

As mentioned, the swivel element can be swiveled about an axis oriented perpendicular to the pull-in / pull-out direction and perpendicular to the direction of movement of the locking slide, i. H. this pivot axis is also perpendicular to a main plane of the rails of the drawer extension.

The locking slide is attached in a manner known per se, in particular to a locking rod. At the other end of the locking bar, another locking slide is attached, which interacts with the adjacent drawer. If a drawer is opened, the locking slides cooperating with its draw-in device are pushed out of the draw-in device and thus into the draw-in devices of the adjacent drawers, so that they are prevented from being pulled out.

The pivot element preferably has a holding section which interacts with the inner rail during an extension movement. The pivot element is mounted on the slide in such a way that the holding section is pivoted in a release position with respect to a holding position in the direction of a longitudinal center axis of the slide. During the pulling-in process and along a section of the way when the drawer is subsequently pulled out, the holding section produces a positive coupling in the pull-in / pull-out direction between the inner rail and the slide. The spring force acting on the slide can thus be transmitted to the inner rail for automatic retraction, and when the drawer is opened again, the opening force exerted on the drawer is transmitted to the slide so that the spring means can be tensioned again. The section ends where the swivel element is in the release position has reached. In this position, the slide is locked in a manner known per se by means of the pivot element on a stationary element. It can only move in the retraction direction again when the swivel element is again contacted by the inner rail when the drawer is pushed in.

Said mounting of the pivoting element on the slide enables simple interaction of the locking slide with the pivoting element, in that the locking slide can interact in particular with a region of the pivoting element which is located on the opposite side of the holding section with respect to the pivoting axis. The individual lever sections of the pivot element on both sides of the pivot axis can thus be made relatively short, which benefits the mechanical stability.

Alternatively, the swivel element can be mounted on the slide in such a way that the holding section faces outwards in the release position, i. H. is pivoted away from the longitudinal center axis of the carriage. In this case, the interaction between the pivot element and the locking slide takes place either on the lever side of the holding section or by means of a corresponding mechanism for deflecting a movement of the locking slide.

The swivel element advantageously has an eccentrically (ie spaced from) cam which interacts with a stationary cam to control the swivel movement when the slide moves in the retraction / extension direction. In this context, "stationary" means that the cam does not move with the slide. The interaction between cam pin and cam ensures in particular that the swivel element reaches the release position in the correct position. It can also be used for the aforementioned locking on the stationary element. Starting from the retracted position, the curve has in particular an axial section in which the swivel element moves with the slide in the pull-out direction without rotation, an inclined section in which the swivel element rotates into a release position, and a locking section, which in particular is perpendicular to the / Extension direction runs and forms a section on which the cam for locking the slide is supported.

In principle, the movement of the pivot element can also be controlled in other ways, e.g. B. via a (stationary) rack and a pinion coupled to the pivot element.

The stationary curve preferably has an elastic delimiting wall in one section, so that by overcoming an insertion force, the inner rail can be coupled to the slide in a retracted position of the retraction device by temporarily pivoting the holding section of the pivot element, the cam pin temporarily deforming the elastic delimiting wall . This functionality is necessary if, for whatever reason, the retraction device is in the retracted position, but the drawer with the inner rail is initially open. This can be the case during assembly or after incorrect manipulation. Through the process mentioned, it is possible, by simply pushing in the drawer, to recouple the inner rail in the intended manner to the pull-in device.

The retraction device preferably comprises a guide receptacle in which the slide is mounted so as to be linearly movable in the retraction / extraction direction. The guide seat can be an integral part of the fixed rail element. Advantageously, however, it is an additional component which can be fastened to the fixed rail element, for example by means of a latching connection. In particular, the fixed rail element has a U-shaped cross section, and the guide receptacle is received within the space defined between the two legs on the base of the fixed rail element.

The stationary curve is preferably formed on the guide receptacle. This results in a simple and mechanically stable construction.

The pivot element advantageously has an actuating section which interacts with the inner rail during a retraction movement. This is contacted by the inner rail (or contact elements arranged on it) when the drawer is pushed in, so that the slide is released from its axial locking is resolved. At the same time, the holding section of the pivot element comes into engagement with the inner rail (or contact elements arranged on it), so that the inner rail (together with the drawer) is taken along with the slide in the pull-in direction and up to the pull-in position due to the spring action. The actuating section and the holding section thus form a receptacle, between which the element of the inner rail that interacts with the pivoting element is received during the pull-in movement and along the mentioned section when pulling out.

Alternatively, there is no such actuation section. In this case, the release is brought about, for example, by direct contact between the inner rail and the slide.

The pivot element preferably has a locking section which interacts with the locking slide in the locking position. This locking section is dimensioned in such a way that there is a safe and mechanically reliable interaction with the locking slide.

The locking section advantageously comprises a nose which, in the locking position, engages behind a free end of the locking slide. The nose avoids a pivoting movement of the pivot element even if the locking slide is moved slightly outwards, for. B. due to material tolerances in the locking mechanism, as can occur, for example, due to a thermal contraction of the locking rods connecting the locking slide. In this way, pivoting during a first movement segment starting from the closed position is reliably prevented even if the locking slide is not completely pushed in. This is particularly important when, in the closed position, the swivel element can be swiveled due to an elastic delimiting wall of the curve (or for other reasons) in order to enable an inner rail that is not initially coupled to be introduced. If the pivoting movement is not prevented, it would otherwise be possible in this case, with the retraction device locked, to release the inner rail from the slide by overcoming a certain force and thus to open the drawer anyway.

The slide advantageously has a blocking surface which interacts with the blocking slide in the blocking position. By inserting the locking slide, the slide is prevented from moving in the opening direction.

In the retracted state of the slide, the blocking section and the blocking surface preferably together form a receptacle for the blocking slide which tapers in the direction of a longitudinal center axis of the slide. The receptacle is designed in particular to be essentially triangular or trapezoidal. This enables the pull-out force acting on the slide (and the swivel element) to be converted into an ejection force that acts on the locking slide and is directed transversely to the pull-in / pull-out direction.

The holding section of the pivot element is advantageously arranged on a first side of the slide facing the inner rail, and the locking section of the pivot element is arranged on a second side of the slide opposite the first side. In particular, the slide comprises a base plate on which its further components are arranged and possibly supported. In the area of the pivot element, the base plate comprises an opening through which sections of the pivot element protrude. In addition to the locking section, the cam pin is also located on the second side facing the stationary cam.

Alternatively, both the holding section and the locking section are located on the same side of the slide, in particular on the side facing the inner rail.

Two pivot elements are preferably arranged symmetrically to the longitudinal center axis of the slide. As a result, a more even power transmission can be achieved; in addition, the transmitted forces are distributed over two spaced-apart contact surfaces. Torques acting on the slide and thus the pull-in device due to eccentrically acting forces from the inner rail are essentially canceled out due to the symmetrical arrangement.

Alternatively, there is only one swivel element. It is also possible to provide more than two swivel elements.

The retraction device advantageously has a damper element received in the slide. The damper element is designed in particular as a fluid damper. It preferably has a spring which brings the damper into an axially elongated position.

The damper element enables a relatively slow pull-in movement. A hard hitting when completely closing and the associated noise development are prevented. The risk of injury from trapped hands or fingers is also minimized.

A damper rod of the damper element preferably interacts with a stationary element of the retraction device. This enables a simple construction. The stationary element can in particular be the guide receptacle for the slide.

The stationary element is advantageously arranged in the pull-in direction of the carriage. The damper thus interacts with the stationary element in an area which is opposite the interaction area with the inner rail. The respective interactions do not hinder each other.

1. a) einen Schlitten zur temporären Ankopplung an eine Innenschiene des Schubladenauszugs;
2. b) eine Führungsaufnahme, in welcher der Schlitten in Ein-/Auszugsrichtung linear beweglich gelagert ist.
3. c) Federmittel, die zwischen dem Schlitten und der Führungsaufnahme angeordnet sind und welche den Schlitten in Einzugsrichtung mit einer Federkraft beaufschlagen;
4. d) zwei am Schlitten symmetrisch zu seiner Längsmittelachse angeordnete Schwenkelemente, die um eine senkrecht zur Ein-/Auszugsrichtung und senkrecht zur Bewegungsrichtung des Sperrschiebers orientierte Achse schwenkbar sind;
5. e) zwei an der Führungsaufnahme ausgebildete Kurven zum Zusammenwirken mit je einem an einem Schwenkelement exzentrisch angeordneten Kurvenzapfen zur Steuerung der Schwenkbewegung des Schwenkelements.

In a preferred embodiment, the retraction device comprises the following:

1. a) a slide for temporary coupling to an inner rail of the drawer extension;
2. b) a guide receptacle in which the carriage is mounted so as to be linearly movable in the retraction / extraction direction.
3. c) spring means which are arranged between the carriage and the guide receptacle and which apply a spring force to the carriage in the pull-in direction;
4. d) two pivoting elements arranged on the slide symmetrically to its longitudinal center axis, which are pivotable about an axis oriented perpendicular to the pull-in / pull-out direction and perpendicular to the direction of movement of the locking slide;
5. e) two curves formed on the guide receptacle for interaction with a respective cam pin which is arranged eccentrically on a swivel element for controlling the swivel movement of the swivel element.

The slide can be blocked in a retracted position by a locking slide that can be moved transversely to the pull-in / pull-out direction, in that the locking slide blocks a pivoting movement of the pivoting element in the locking position.

Further advantageous embodiments and combinations of features of the invention emerge from the following detailed description and the entirety of the patent claims.

Brief description of the drawings

Fig. 1

Einen Schubladenauszug mit einer erfindungsgemässen Einzugsvorrichtung in einer teilweise ausgezogenen Stellung;

Fig. 2

den Schubladenauszug in der eingefahrenen Stellung;

Fig. 3

eine Rückansicht der erfindungsgemässen Einzugsvorrichtung in der eingefahrenen Stellung;

Fig. 4

einen ersten Querschnitt durch die erfindungsgemässe Einzugsvorrichtung in der eingefahrenen Stellung;

Fig. 5

einen zweiten Querschnitt durch die erfindungsgemässe Einzugsvorrichtung in der eingefahrenen Stellung;

Fig. 6

eine Rückansicht der erfindungsgemässen Einzugsvorrichtung in der Bereitschaftsposition; und

Fig. 7

einen Querschnitt durch die erfindungsgemässe Einzugsvorrichtung in der Bereitschaftsposition.

The drawings used to explain the exemplary embodiment show:

Fig. 1

A drawer extension with a retraction device according to the invention in a partially extended position;

Fig. 2

the drawer extension in the retracted position;

Fig. 3

a rear view of the inventive retraction device in the retracted position;

Fig. 4

a first cross section through the retraction device according to the invention in the retracted position;

Fig. 5

a second cross section through the retraction device according to the invention in the retracted position;

Fig. 6

a rear view of the inventive retraction device in the standby position; and

Fig. 7

a cross section through the retraction device according to the invention in the standby position.

In principle, the same parts are provided with the same reference symbols in the figures.

Ways of Carrying Out the Invention

The Figure 1 shows a drawer extension with a retraction device according to the invention in a partially extended position. The Figure 2 shows the drawer extension in the retracted position. The drawer extension 1 comprises an outer rail 2, a central rail 3 and an inner rail 4, which are telescopically mounted on one another. For this purpose, roller bearings 5, 6 are arranged in a manner known per se between the outer rail 2 and the central rail 3 and between the central rail 3 and the inner rail 4. The three rails can thus be moved linearly to one another with little resistance. All three rails are each formed by a substantially U-shaped profile made of sheet metal. The center rail 3 is completely received between the legs of the outer rail 2, the inner rail 4 in turn between the legs of the center rail 3.

The draw-in device 10 according to the invention is arranged at the free end of the outer rail 2. This is related to the others Figures 3-7 described in detail. On the one hand, two locking slides 21, 22 cooperate with the pull-in device 10, which are mounted on the pull-in device 10 in a linearly displaceable manner perpendicular to the pull-in / pull-out direction of the drawer pull-out 1 in the main plane of the drawer pull-out 1. On the other hand, a contact piece 7 arranged on the end of the inner rail 4 facing the pull-in device 10 interacts with the pull-in device 10. This contact piece is made of plastic and is arranged with a latching connection at the end of the inner rail 4. On its side facing the outer rail 2, it has two retaining cams 7a, 7b (see also FIG Figure 5 ).

As described in detail below, the locking slides 21, 22 can, in the retracted position of the retraction device 10, engage with their free end in the retraction device 10 and interact with it. At the opposite end, the locking slides 21, 22 are firmly connected to a locking rod, which is connected at the other end to a further locking slide which cooperates with the retraction device of an adjacent drawer. The top or The lowest drawer only interacts with a locking slide on the side facing the next lower or next upper drawer. The locking bars with the locking slides are oriented vertically and freely movable along a linear guide. If the respective lower retraction device is in the retracted position, the locking slide connected to the locking rod will move into the retraction device due to the influence of gravity, while the upper locking slide attached to the same locking rod is extended from the corresponding upper retraction device.

The Figures 3-5 show the retraction device according to the invention in the retracted position. The Figure 3 shows a rear view that Figure 4 a first cross section parallel to the main plane of the drawer extension and the Figure 5 a second cross section parallel to this main plane. The first cross-section according to Figure 4 runs in the plane of the locking slide 21, 22. The second cross section according to FIG Figure 5 runs in the plane of the pivot elements cooperating with the holding cams 7a, 7b of the inner rail 4. The first cross section thus runs between that in the Figure 3 rear side shown and the second cross-section.

The retraction device 10 comprises a housing 30 which forms a guide seat and which is positioned between the legs of the U-shaped outer rail 2 (cf. Figures 4 , 5 ) is recorded. The housing 30 is made of a polymer and, due to its elasticity, is held on the outer rail 2 by a clip connection. The housing 30 has lateral openings 31, 32 which, when the housing 30 is in the attached state, correspond to openings 2a, 2b in the two legs of the outer rail 2. The openings 31, 32 are formed in the mouth parts of the housing 30, which further fix the pull-in device 10 axially in the outer rail 2.

The housing 30 also has a substantially U-shaped cross section. At the transition between the base and the two legs protruding at right angles from this, longitudinal grooves are formed. In these guide sections of a carriage 40 are mounted so as to be linearly movable. The slide 40 can thus be moved relative to the housing 30 in the pull-in / pull-out direction.

The slide 40 comprises a receptacle 41 for a damper element 50 (cf. Figure 5 ). This receptacle has a rectangular base and an approximately square cross section, so that the base body 51 of the cylindrical damper element 50 can be received. At its end facing the inner rail, the receptacle 41 has a support surface 42 on which the rear end of the base body 51 of the damper element 50 is supported. At the opposite end, the receptacle 41 has a through opening 43 through which a damper rod 52 of the damper element 50 can pass.

The damper element 50 is a known fluid damper, the damper rod 52 of which is biased into the extended position by a spring. In the assembled position, the damper rod 52 makes contact with a stop 33 on the housing 30. This stop 33 is formed on the inside of an arcuate deflecting element 34. A helical spring 60 slidingly mounted on it runs around this (cf. Figure 5 , only indicated by a dashed line for the sake of a better overview), which is fastened at both ends to fastening pins 44a, 44b of the slide 40. The slide 40 is thus subjected to a force in the pull-in direction by the helical spring 60, which is always pretensioned.

On a base plate of the carriage 40, two swivel elements 45, 46 are mounted pivotably about axes oriented perpendicular to the main plane of the pull-in device 10 and arranged symmetrically to the central longitudinal axis of the pull-in device 10 (cf. Fig. 4 , 5 ). The axes are located in the retraction / extension direction in front of a central axis of the locking slides 21, 22, ie closer to the inner rail 4 than the locking slides 21, 22. The pivot elements 45, 46 comprise a front part 45a, 46a, which is located in front of the pivot axis and the inner rail 4 faces, and a rear part 45b, 46b, which is located behind the pivot axis and faces the corresponding locking slide 21, 22. The front part 45a, 46a is received in an opening in the base plate of the carriage 40, while the rear part 45b, 46b is only located on the rear side of the base plate.

In the in the Figure 4 The rear part 45b, 46b of the pivot element 45, 46 has a receptacle 45c, 46c for the free end of the corresponding plane Lock slide 21, 22 on. The geometry of the receptacle 45c, 46c is adapted to the geometry of the locking slide 21, 22; Thus, the receptacle 45c, 46c has a concave shape with a nose 45d, 46d which can engage behind an inserted locking slide 21, 22. The slide 40 has a ramp-like interaction surface 49a, 49b in the same plane in which the rear part 45b, 46b of the pivot element 45, 46 can interact with the locking slide 21, 22. Both the receptacle 45c, 46c in the area of the nose 45d, 46d and the interaction surface 49a, 49b have an angle of 45 ° to the central longitudinal axis of the pull-in device 10.

On the rear side, the pivot elements 45, 46 have a guide pin 45e, 46e in the area of the front part 45a, 46a. This interacts with a guide curve 35, 36 which is formed in the housing 30 of the pull-in device 10. The guide curve 35, 36 - analogously to the pivot elements 45, 46 and the guide pins 45e, 46e - is designed symmetrically to the central longitudinal axis of the draw-in device 10. It has a rear section 35a, 36a running essentially axially (i.e. in the retraction / extension direction), a section 35b, 36b adjoining it at the front (i.e. in the direction of the inner rail 4) and tapering towards the central longitudinal axis, and a transversely adjoining section 35b, 36b again at the front section 35c, 36c extending to the central longitudinal axis. The inner lateral delimitation of the rear section 35a, 36a closer to the central longitudinal axis of the pull-in device 10 is formed on the inside by a resilient tongue 35d, 36d.

The locking slides 21, 22 have an essentially rectangular cross section. In the area of the free end, in the plane interacting with the pivot elements 45, 46, the width of the locking slide 21, 22 is reduced, so that a symmetrical trapezoidal shape results in this area. In a plane behind the pivoting elements 45, 46, the locking slides extend further inward, at their free end they have a step-like shape so that forces acting along the locking slides and locking rods can be transmitted from one side of the pull-in device 10 to the other ( see. Figure 3 ).

In a plane in front of the base body of the carriage 40, the swivel elements 45, 46 have a receptacle 45f, 46f (cf. Figure 5 ). This is outwards, ie in one direction away from the central longitudinal axis of the pull-in device 10, and is limited by a holding section 45g, 46g on the side facing the inner rail 4 and an actuating section 45h, 46h on the side facing away from the inner rail 4.

The Figure 6 shows a rear view of the draw-in device according to the invention. It corresponds to the opinion Figure 3 , the device is now in the ready position. The Figure 7 shows a cross section through the draw-in device according to the invention in the standby position. The representation otherwise corresponds to Figure 5 . The function of the pull-in device 10 is explained below with reference to FIG Figures 3-7 explained.

In the retracted position according to the Figures 3-5 the two pivot elements 45, 46 are pivoted outward with their front part 45a, 46a due to the interaction between guide pins 45e, 46e and guide curve 35, 36 and the holding cams 7a, 7b of the inner rail 4 are behind the holding section 45g, 46g in the receptacle 45f , 46f added. If the corresponding drawer is now pulled out, the pull-out movement is transmitted directly to the inner rail 4. The holding cams 7a, 7b fixed thereon take the pivoting elements 45, 46 and thus the carriage 40 along the guide formed by the housing 30 via the holding sections 45g, 46g With. The guide pins 45e, 46e are guided in the guide curves 35, 36. When pulling out, the helical spring 60 is also tensioned (further). Due to the spring integrated in the damper element 50, the damper rod 52 of the damper element 50 is extended until its free end strikes the stop 33 again. If the drawer is pulled out quickly, the damper rod 52 can in the meantime lose contact with the stop 33. This is irrelevant in the context of the pull-out movement. Due to the corresponding arrangement, however, it is avoided that possibly occurring high forces are transmitted to the damper element and could damage it.

As soon as the guide pins 45e, 46e have left the rear section 35a, 36a and are guided in the middle section 35b, 36g, a pivoting movement of the pivoting elements 45, 46 results due to their tapering geometry: the holding sections 45g, 46g gradually open inwards the central longitudinal axis of the Retraction device 10 to, pivoted. The holding cams 7a, 7b of the inner rail 4 are only released when the guide pins 45e, 46e cross over into the sections 35c, 36c running transversely to the central longitudinal axis. When the retaining cams 7a, 7b are released, the inner rail is separated from the pull-in device 10. The guide pins 45e, 46e are held in the standby position thus reached on the rear surface of the transverse sections 35c, 36c. The coil spring 60 thus remains tensioned and the carriage 40 in the position it has reached. The damper rod 52 of the damper element 50 is in the elongated position; its free end contacts the stop 33 on the housing 30 of the pull-in device 10.

The standby position as in the Figures 6 and 7th is held is now retained until the drawer is closed again and in this connection the holding cams 7a, 7b come into contact with the pivoting elements 45, 46 of the carriage 40 again. The holding cams 7a, 7b initially contact the actuating sections 45h, 46h of the pivoting elements 45, 46. With the slide 40 initially held in the axial direction, the pivoting elements 45, 46 are then pivoted outward so that the guide pins 45e, 46e move into the central section 35b , 36b of the guide curve 35, 36 and the holding sections 45g, 46g of the pivot element again engage behind the holding cams 7a, 7b axially. The middle and the rear section 35b, 35a, 36b, 36a of the guide curve allow a retraction movement of the slide 40 caused by the helical spring 60, during which the inner rail and thus the entire drawer extension is carried along. This movement is damped by the damper element 50, which is arranged between the slide 40 and the housing 30. The movement ends when the rear end of the carriage 40 hits the housing in the area of the stroke end surfaces 61a, 61b (see FIG Fig. 4 ). The pivot elements 45, 46 are moved back into their pivoted position in the retracted position due to the interaction between the guide cams 35, 36 and the guide pins 45e, 46e.

If the pull-in device 10 is in the retracted position during the assembly process or after incorrect manipulation, but the inner rail is not coupled to the pull-in device 10, the initial state can be set according to FIG Figures 3-5 manufacture in a simple way. For this purpose, the inner rail is moved towards the pull-in device 10 (by sliding in the drawer). The holding cams 7a, 7b come into contact with a front side of the holding sections 45g, 46g. Their shape is such that they are thereby pressed inward and thereby cause a corresponding pivoting movement of the pivoting elements 45, 46 until the holding cams 7a, 7b have passed the holding sections 45g, 46g. The latter then snap back so that the retaining cams 7a, 7b are received in the desired manner in the receptacles 45f, 46f. The corresponding pivoting movement of the pivoting elements 45, 46 is made possible in this process by the resilient tongues 35d, 36d, which limit the rear sections 35a, 36a of the guide curves 35, 36 inward. The resilient tongues 35d, 36d also ensure that the holding sections 45g, 46g snap back after passing the holding cams 7a, 7b.

In the retracted position according to the Figures 3-5 the locking slides 21, 22 can be retracted into the retraction device 10. Its front end is then initially received in the receptacle 45c, 46c of the corresponding pivot element 45, 46. Each of the locking slides 21, 22 can now in principle be freely linearly movable. This is the case when none of the drawers of a plurality of drawers lying one above the other is open. In this case, the drawer assigned to the pull-in device 10 can be opened easily. Locking slides, which are initially retracted into the retraction device, in particular locking slides 21, which are arranged above the retraction device 10 and are in the retracted position due to the force of gravity, are gradually moved out of the retraction device 10 by the corresponding interaction surface 49a, 49b of the carriage 40 emotional.

The coupling in the direction of action of the locking slides 21, 22 and locking rods due to the step-like shape means that only one of several drawers arranged one above the other can always be opened. The retraction devices of the other drawers are locked via the locking slides and locking bars, so that the corresponding additional drawer extensions can no longer be pulled out.

If one of the locking slides 21, 22 is now in a locking position due to another already opened drawer, it cannot be in the linear position Move direction of movement of locking slide 21, 22. Due to the interaction between the locking slide 21, 22 and the corresponding pivoting element 45, 46, an extension movement of the retraction device 10 and thus a release of the holding cams 7a, 7b is prevented. Due to the shape of the pivot element 45, 46 with the nose 45d, 46d, this is also ensured if the blocking slide 21, 22 does not extend completely to the end of the receptacle due to manufacturing tolerances or thermal effects. The tapering area of the locking slide 21, 22 will also in this case - possibly after a minimal axial movement of the carriage 40, interact over a large area with the surface delimiting the nose 45d, 46d and a pivoting movement (which would otherwise be possible in principle due to the resilient tongue of the guide curve ) prevent.

The invention is not limited to the illustrated embodiment.

In summary, it can be stated that the invention creates a draw-in device which is simply constructed and mechanically robust.

Claims (16)

1. Drawer mechanism (1) having a fixed rail element for attaching to a furniture cabinet and at least one movable rail element mounted on said fixed rail element, comprising an inner rail (4) being an innermost movable rail element to be fastened to an extendable furniture part, the drawer mechanism (1) comprising a retraction device (10) having a spring-loaded slide (40) movable in the retraction/extension direction for temporarily coupling to elements (7, 7a, 7b) disposed in a region of a free end of the inner rail (4), wherein the slide (40) is capable of being blocked in a retraction position by a blocking latch bolt (21, 22) that in a guide is movable transversely to the retraction/extension direction, wherein the slide (40) for coupling to the elements (7, 7a, 7b) of the inner rail (4) has at least one pivot element (45, 46) which is pivotable about an axis that is oriented so as to be perpendicular to the retraction/extension direction and perpendicular to the movement direction of the blocking latch bolt (21, 22), wherein a geometry of the pivot element (45, 46) matches a geometry of the elements (7, 7a, 7b) disposed in the region of the free end of the inner rail (4), wherein the pivot element (45, 46) and the guide are disposed in such a manner that the blocking latch bolt (21, 22) in a blocking position blocks a pivoting movement of the pivot element (45, 46).
2. The drawer mechanism as claimed in claim 1, characterized in that the pivot element (45, 46) has a holding portion (45g, 46g) that in an extension movement interacts with the element (7), wherein the pivot element (45, 46) is mounted on the slide (40) in such a manner that the holding portion (45g, 46g) in a release position in relation to a holding position is pivoted in the direction of a longitudinal central axis of the slide (40).
3. The drawer mechanism as claimed in claim 1 or 2, characterized in that the pivot element (45, 46) has an eccentrically disposed cam pin (45e, 46e) which for controlling the pivoting movement in a movement of the slide (40) in the retraction/extension direction interacts with a stationary curve (35, 36).
4. The drawer mechanism as claimed in claim 3, characterized in that the stationary curve (35, 36) in a part-portion (35a, 36a) has an elastic delimitation wall (35d, 36d) such that the inner rail (4) in a retracted position of the retraction device (10) is capable, by overcoming an insertion force, of being coupled to the slide (40) in that the holding portion (45g, 46g) of the pivot element (45, 46) is temporarily pivoted, wherein the cam pin (45e, 46e) temporarily deforms the elastic delimitation wall (35d, 36d).
5. The drawer mechanism as claimed in one of claims 1 to 4, characterized by a guide receptacle (30) in which the slide (40) is mounted so as to be movable in a linear manner in the retraction/extension direction.
6. The drawer mechanism as claimed in claim 3 or 4 and as claimed in claim 5, characterized in that the stationary curve (35, 36) is configured on the guide receptacle (30).
7. The drawer mechanism as claimed in one of claims 1 to 6, characterized in that the pivot element (45, 46) has an activation portion (45h, 46h) that in an retraction movement interacts with the element (7).
8. The drawer mechanism as claimed in one of claims 1 to 7, characterized in that the pivot element (45, 46) has a blocking portion (45c, 45d, 46c, 46d) which in the blocking position interacts with the blocking latch bolt (21, 22).
9. The drawer mechanism as claimed in claim 8, characterized in that the blocking portion (45c, 45d, 46c, 46d) comprises a lug (45d, 46) which in the blocking position engages behind a free end of the blocking latch bolt (21, 22).
10. The drawer mechanism as claimed in one of claims 1 to 9, characterized in that the slide (40) has a blocking face (49a, 49b) which in the blocking position interacts with the blocking latch bolt (21, 22).
11. The drawer mechanism as claimed in claim 8 or 9 and as claimed in claim 10, characterized in that the blocking portion (45c, 45d, 46c, 46d) and the blocking face (49a, 49b) in the retracted state of the slide (40) conjointly form a receptacle for the blocking latch bolt (21, 22), said receptacle tapering in the direction of a longitudinal central axis of the slide (40).
12. The drawer mechanism as claimed in claims 2 and 8, characterized in that the holding portion (45g, 46g) of the pivot element (45, 46) is disposed on a first side of the slide (40) that faces the inner rail, and in that the blocking portion (45c, 45d, 46c, 46d) of the pivot element (45, 46) is disposed on a second side of the slide (40) that is opposite the first side.
13. The drawer mechanism as claimed in one of claims 1 to 12, characterized in that two pivot elements (45, 46) are disposed so as to be symmetrical to the longitudinal central axis of the slide (40).
14. The drawer mechanism as claimed in one of claims 1 to 13, characterized by a damping element (50) that is received in the slide (40).
15. The drawer mechanism as claimed in claim 14, characterized in that a damper rod (52) of the damping element (50) interacts with a stationary element (33) of the retraction device (10).
16. The drawer mechanism as claimed in claim 15, characterized in that the stationary element (33) is disposed in the retraction direction of the slide (40).

Images