HK40003791B - Retraction device for a drawer mechanism - Google Patents

Description

Retracting device for a drawer mechanism

Technical Field

The invention relates to a retraction device for a drawer mechanism, having a spring-loaded slide which can be moved in a retraction/extension direction for temporary coupling to an inner rail of the drawer mechanism, wherein the slide can be blocked in a retracted position by a blocking latch bolt which can be moved transversely to the retraction/extension direction in a guide, wherein the slide for coupling to the inner rail has at least one pivoting element which can be pivoted about an axis which is oriented perpendicularly to the retraction/extension direction and perpendicularly to the direction of movement of the blocking latch bolt.

Background

Drawer mechanisms are known which comprise a fixed rail element for attachment to a furniture cabinet and at least one movable rail element mounted on the fixed rail element. The innermost movable rail element, i.e., the inner rail, is secured to the extendable portion of the furniture. Depending on the length and extension of the drawer mechanism, further movable rail elements may be provided between the fixed rail element and the inner rail, which interact in a nested telescopic manner. For example, the rail elements are mounted to each other by ball or roller guides.

Drawer mechanisms are generally adapted for mounting extendable furniture components; for simplicity, the term "drawer" will be used hereinafter. However, the described retraction device is in principle applicable to a variety of extendable furniture parts. In each case, a mechanism is usually provided on one drawer.

When the drawer is inserted, the retraction device for the drawer mechanism automatically guides the drawer to its end position. Therefore, the ease of operation of the drawer is improved, and noise generated when closing can be minimized. The known retraction device has an inner track and guides the inner track along part of the distance of the closing movement from a standby position of the retraction device to the closed state.

For example, a retraction device comprising a movable slide on which a latch for interaction with an internal track is rotatably arranged is known from DE 112008001880T 5 (accuracy International Inc.).

In the case of an article of furniture having a plurality of drawers arranged one above the other, it is usual to prevent the simultaneous extraction of a plurality of drawers, in particular to avoid the risk of any tilting of the drawers by repeated extraction of several times and the risk of injury to the user of a body part that is stuck. In this context, it is known to provide blocking latch bolts which are coupled to the drawer mechanism and prevent one drawer from being withdrawn when the other drawer has been fully or partially withdrawn.

DE 102012109751 a1(Paul Hettich GmbH & co. kg) describes a drawer mechanism with an automatic retraction or ejection device with a repositionably mounted entrainment element by means of which the retraction or ejection device, respectively, can be actuated. For this purpose, an actuator provided on a closing stop plugged onto the front end of the inner rail interacts with the entrainment element. Furthermore, the entrainment element has a pin for engaging a locking bar for locking and unlocking a plurality of drawers placed one above the other.

The mechanism has a complex structure with many parts. In the case of predetermined mechanical requirements for the mechanism, correspondingly high production costs result. For embodiments without a pop-up function, this structure is not advantageous.

Disclosure of Invention

The object of the present invention is to achieve a retraction device which is relevant to the technical field mentioned at the outset and which is constructed in a simple manner and is mechanically robust.

This object is achieved by the features of claim 1. According to the invention, the pivoting element and the guide are arranged such that the blocking latch bolt in the blocking position blocks the pivoting movement of the pivoting element.

No other parts are required than the elements that are required to be present anyway, in particular the blocking latch bolt and the pivoting element. This results in a simple construction. Thereby achieving low cost and high mechanical stability.

The retraction device is in particular attached to a fixed rail element. The spring means coupled to the slider may be a single coil spring extending in a linear manner, may be a coil spring deflected through 180 ° along an arc, or may be a plurality of coil springs arranged in parallel. Other spring means, such as a coil spring or a torsion spring, are also envisaged.

The interaction between the inner rail and the pivoting element is in particular performed via elements such as protrusions, pins or gaps provided in the region of the free end of the inner rail, wherein the geometry of the pivoting element is adapted to the geometry of said elements. The element on the inner rail may be configured to be integral with the inner rail, or fixedly or releasably fastened to the inner rail.

As already mentioned, the pivoting element can pivot about an axis oriented perpendicular to the retraction/extension direction and perpendicular to the direction of movement of the blocking latch bolt, that is to say the pivot axis is also perpendicular to the main plane of the rail of the drawer mechanism.

The blocking latch bolt is fastened in a manner known per se, in particular to the blocking lever. Another blocking latch bolt interacting with an adjacent drawer is fastened to the other end of the blocking lever. When one drawer is open, the blocking latch bolt interacting with the retraction device of said drawer is pressed out of the retraction device and thus into the retraction device of the adjacent drawer, thereby preventing the extraction of the adjacent drawer.

The pivoting element preferably has a retaining portion which interacts with the inner rail in the extending movement. Here, the pivoting element is mounted on the slide in the following manner: such that the holding part in the release position is pivoted in the direction of the longitudinal centre axis of the slider with respect to the holding position. The retention of the partial distance during the retraction process and in the subsequent extension of the drawer results in a positive-locking coupling of the inner rail with the slide in the retraction/extension direction. The spring force acting on the slide for automatic retraction can thus be transmitted to the inner rail, and the opening force exerted on the drawer is transmitted to the slide in the renewed opening, so that the spring means can be tensioned again. The partial distance ends where the pivoting member reaches the release position. The slide in this position is locked to the fixed element by means of the pivoting element in a manner known per se. As soon as the pivoting element in the insertion of the drawer comes into contact again with the inner rail, the slide can only be moved again in the retraction direction.

The mentioned mounting of the pivoting element on the slider enables a simple interaction of the blocking latch bolt with the pivoting element, wherein the blocking latch bolt 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 pivot axis. Thus, the respective lever portions of the pivoting element on both sides of the pivot axis can be configured relatively short, which is advantageous for mechanical stability.

Alternatively, the pivoting element may be mounted on the slide in the following manner: so that the holding portion in the release position is pivoted outwards, that is to say away from the longitudinal centre axis of the slider. In this case, the interaction between the pivoting element and the blocking latch bolt takes place on the lever side of the holding part or by a corresponding mechanism for deflecting the movement of the blocking latch bolt.

The pivoting element advantageously has an eccentrically arranged (that is to say spaced apart) cam pin which interacts with the stationary curve for controlling the pivoting movement of the slide in the movement in the retraction/extension direction. By "stationary" is meant herein that the curve does not move in unison with the slider. The interaction between the cam pin and the cam track ensures in particular that the pivoting element reaches the release position in the correct position. Furthermore, the interaction can also be used for the above-mentioned locking on the stationary element. The cam track has, starting from the retracted position, in particular an axial section in which the pivoting element moves jointly with the slider in the extension direction without rotation of the pivoting element, an inclined section in which the rotation of the pivoting element into the release position takes place, and a locking section which extends in particular perpendicularly to the retraction/extension direction and forms a part on which a cam pin is supported for locking the slider.

Controlling the movement of the pivoting element can in principle also be performed in another way, for example by means of a (stationary) rack and a pinion coupled to the pivoting element.

The stationary cam track preferably has an elastic limiting wall in one part, so that the inner rail in the retracted position of the retraction device can be coupled to the slide by overcoming the insertion force, pivoting temporarily in the holding section of the pivoting element in the slide, wherein the cam pin temporarily deforms the elastic limiting wall. This function is required when for any reason the retraction means is in the retracted position, but the drawer with internal track is initially open. This may be the case in the case of assembly or after an erroneous operation. Due to the mentioned procedure, the inner rail can be coupled to the retraction device again in the envisaged manner by simply inserting the drawer.

The retraction device preferably comprises a guide reception in which the slide is mounted so as to be movable in a linear manner in the retraction/extension direction. The guide receiving portion may be an integral part of the fixed rail element. However, the guide receiver is advantageously an additional component which can be fastened to the fixed rail element, for example by a latching connection. The fixed rail element has in particular a U-shaped cross-section and the guide reception is received in a space defined between the two legs at the base of the fixed rail element.

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

The pivoting element advantageously has an actuating portion which interacts with the inner track in the retracting movement. When the drawer is inserted, the actuating portion is contacted by the inner rail (or a contact element correspondingly provided on the inner rail) so that the axial locking of the slide is released from it. The retaining portion of the pivoting element simultaneously engages with the inner rail (or a contact element correspondingly arranged thereon) so that the inner rail (together with the drawer) is carried along in the retraction direction by means of a spring acting jointly with the slide and up to the retracted position. The actuating portion and the retaining portion thus form a receiving portion between which the element of the inner rail that interacts with the pivoting element is received during the retraction movement and when extended along the mentioned partial distance.

Alternatively, no actuation part of this type is present. In this case, the release is caused, for example, by direct contact between the inner rail and the slider.

The pivoting element preferably has a blocking portion which interacts with the blocking latch bolt in the blocking position. The blocking portion is dimensioned such that a safe and mechanically reliable interaction with the blocking latch bolt is produced.

The blocking portion advantageously comprises a lug which engages behind the free end of the blocking latch bolt in the blocking position. The lug prevents a pivoting movement of the pivoting element even when the blocking latch bolt is displaced slightly outwards, for example due to material tolerances such as may occur in the blocking mechanism, for example due to thermal shrinkage of a blocking rod connecting the blocking latch bolt. Therefore, even in the case where the blocking latch bolt is not completely inserted, the pivoting from the closed position during the first movement portion can be reliably prevented. This is particularly important when the pivoting element in the closed position is pivotable by means of the elastic limiting wall of the bend (or for other reasons) to be able to introduce the initially uncoupled inner rail. If this pivoting movement is not prevented, in this case, in the case of a blocked retraction device, the inner rail can be released from the slide again by overcoming a certain force and the drawer is therefore still open.

The sliding element advantageously has a blocking surface which interacts with the blocking latch bolt in the blocking position. Therefore, by inserting the blocking latch bolt, the slider is prevented from moving in the opening direction.

The blocking portion and the blocking face preferably together form a receptacle for the blocking latch bolt in the retracted state of the slider, said receptacle tapering in the direction of the longitudinal center axis of the slider. The receptacle is in particular configured substantially triangular or trapezoidal. This enables the extension force acting on the slide (and the pivoting element) to be converted into an ejection force which is directed transversely to the retraction/extension direction and acts on the blocking latch bolt.

The retaining portion of the pivoting element is advantageously arranged on a first side of the slider facing the inner rail and the blocking portion of the pivoting element is arranged on a second side of the slider opposite the first side. The slider comprises in particular a base plate on which the other components of the slider are arranged and optionally mounted. The base plate comprises an interruption in the area of the pivot element through which a portion of the pivot element protrudes. In addition to the blocking portion, the cam pin is therefore also located in particular on the second side facing the stationary curve.

Alternatively, the holding portion and the blocking portion are both on the same side, in particular on the side of the slide facing the inner track.

Preferably the two pivoting elements are arranged symmetrically with respect to the longitudinal centre axis of the slider. A more uniform force transmission can thereby be achieved, and the transmitted force is also distributed to the two spaced apart contact surfaces. By means of the eccentric forces from the inner track acting on the slide and thus on the retraction device, the torques substantially cancel each other by means of this symmetrical arrangement.

Alternatively, there is only one pivoting element. More than two pivoting elements may also be provided.

The retraction device advantageously has a damping element received in the slider. The damping element is in particular designed as a fluid damper. The damping element preferably has a spring which moves the damping action into an axially extended position.

The damping element enables a relatively slow retraction movement. Preventing serious effects of noise generation at and associated with full shut-down. The risk of injury due to finger jamming is also minimized.

The damper rod of the damping element preferably interacts with the stationary element of the retraction device. This enables a simple configuration to be obtained. The stationary element may in particular be a guide receptacle for a slide.

The stationary element is advantageously arranged in the retraction direction of the slide. The damper thus interacts with the stationary element in a region of said stationary element located opposite to the inner rail interaction region. Thus, the respective interactions do not interfere with each other.

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

a) a slide for temporary coupling to an internal track of a drawer mechanism;

b) a guide receiving part in which the slider is mounted to be movable in a linear manner in the retracting/extending direction;

c) spring means which are provided between the slider and the guide receiving portion and which impact the slider in the retracting direction by a spring force;

d) two pivoting elements which are arranged on the slider symmetrically with respect to the longitudinal central axis of said slider and which are pivotable about an axis oriented perpendicular to the retraction/extension direction and perpendicular to the direction of movement of the blocking latch bolt;

e) two cam tracks which are configured on the guide receiver for interacting in each case with one cam pin, the cam pin for controlling the pivoting movement of the pivoting element being arranged eccentrically on the pivoting element.

The slide here can be blocked in the retracted position by a blocking latch bolt which can be repositioned transversely to the retraction/extension direction, wherein the blocking latch bolt blocks the pivoting movement of the pivoting element in the blocking position.

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

Drawings

In the drawings which illustrate exemplary embodiments:

FIG. 1 shows a drawer mechanism having a retraction device according to the present invention in a partially extended position;

FIG. 2 shows the drawer mechanism in a retracted position;

FIG. 3 shows a rear view of the retracting device in a retracted position according to the present invention;

figure 4 shows a first section of a retraction device according to the present invention in a retracted position;

figure 5 shows a second cross section of the retracting device according to the present invention in the retracted position;

FIG. 6 shows a rear view of the retraction device in a standby position according to the present invention; and

figure 7 shows a section of the retraction device according to the invention in a standby position.

Identical parts in the figures are in principle provided with the same reference numerals.

Detailed Description

Figure 1 shows a drawer mechanism with a retraction device according to the present invention in a partially extended position. Figure 2 shows the drawer mechanism in a retracted position. The drawer mechanism 1 comprises an outer rail 2, an intermediate rail 3 and an inner rail 4, which are telescopically mounted within each other. For this purpose, roller bearings 5 are arranged in a manner known per se between the outer rail 2 and the intermediate rail 3, and roller bearings 6 are arranged in a manner known per se between the intermediate rail 3 and the inner rail 4. Thus, the three rails can be repositioned in a linear manner with respect to each other via little resistance. All three rails are formed in each case from a substantially U-shaped profile formed from sheet metal. The intermediate rail 3 is here completely received between the legs of the outer rail 2, and the inner rail 4 is in turn completely received between the legs of the intermediate rail 3.

A retraction device 10 according to the invention is arranged on the free end of the outer track 2. The retraction device 10 is described in detail in the context of the further figures 3 to 7. On the one hand, two blocking latch bolts 21, 22 mounted on the retraction device 10 so as to be displaceable in a linear manner in the main plane of the drawer mechanism 1 perpendicular to the retraction/extension direction of the drawer mechanism 1 interact with the retraction device 10. On the other hand, the contact 7 arranged on the end of the inner rail 4 facing the retraction device 10 interacts with the retraction device 10. The contact piece is made of plastic material and is arranged on the end of the inner rail 4 via a latching connection. The contact piece has two holding cams 7a, 7b on its side facing the outer rail 2 (see also fig. 5).

As described in further detail below, the blocking latch bolts 21, 22 in the retracted position of the retraction device 10 engage via their free ends in the retraction device 10 and interact with the retraction device 10. The blocking latch bolts 21, 22 are fixedly connected at opposite ends to a blocking rod which is connected at the other end to another blocking latch bolt interacting with the retraction means of the adjacent drawer. The uppermost or lowermost drawer in each case interacts with only one blocking latching bolt on the side of the respective lower drawer facing the adjacent lower drawer or the adjacent upper drawer. The blocking lever with the blocking latch bolt is vertically oriented and freely movable along the linear guide. As long as the respective lower retraction device is in the retracted position, the blocking latch bolt connected to the blocking rod will move into the retraction device by means of the influence of gravity, while the upper blocking latch bolt attached to the same blocking rod will move out of the respective upper retraction device.

Figures 3 to 5 show the retraction device in a retracted position according to the present invention. Fig. 3 shows a rear view, fig. 4 shows a first cross section parallel to a main plane of the drawer mechanism, and fig. 5 shows a second cross section parallel to said main plane. The first section according to fig. 4 extends here in the plane of the blocking latch bolts 21, 22. The second section according to fig. 5 extends in the plane of the pivoting elements which interact with the retaining cams 7a, 7b of the inner rail 4. Thus, the first cross-section extends between the rear viewing side shown in fig. 3 and the second cross-section.

The retracting device 10 comprises a housing 30, which housing 30 forms a guide receiving portion and is received between the legs of the U-shaped outer rail 2 (see fig. 4, 5). The housing 30 is made of a polymer and is held on the outer rail 2 by means of its elasticity by means of a clip-fit connection. The housing 30 has lateral openings 31, 32, which lateral openings 31, 32 correspond to the openings 2a, 2b in the two legs of the outer rail 2 in the attached state of the housing 30. Openings 31, 32 are configured in the mouth of the housing 30, which further axially fix the retraction device 10 in the outer track 2.

The housing 30 also has a generally U-shaped cross-section. The longitudinal groove is configured at the transition between the base and two legs projecting perpendicularly from the base. The guide portion of the slider 40 is mounted to be movable in a linear manner in said longitudinal groove. Thus, the slider 40 can move in the retracting/extending direction with respect to the housing 30.

The slider 40 comprises a receptacle 41 for the damping element 50 (see fig. 5), said receptacle 41 extending along a centre line of said slider 40. The receiving portion has a rectangular base area and an approximately square cross section, so that the body 51 of the cylindrical damping element 50 can be received. The receiving part 41 has a support surface 42 on its end facing the inner rail, the rear end of the body 51 of the damping element 50 being supported on this support surface 42. The receptacle 41 has a passage opening 43 at the opposite end, through which passage opening 43 the damper rod 52 of the damping element 50 can enter.

The damping element 50 is a fluid damper known per se, the damper rod 52 of the damping element 50 being pretensioned into the extended position via a spring. The damper rod 52 in the assembled position contacts the stop 33 on the housing 30. The stop 33 is configured on the inside of the arc-shaped deflecting element 34. A helical spring 60 (see fig. 5; only indicated by dashed lines for better clarity) fastened to the fastening pins 44a, 44b of the slider 40 via two ends extends around said deflecting element 34, said helical spring 60 being mounted to slide on said deflecting element 34. Via this always pretensioned helical spring 60, the slider 40 is thus subjected to a force in the retraction direction.

Two pivoting elements 45, 46 are mounted on the base plate of the slide 40 so as to be able to pivot about an axis oriented perpendicular to the main plane of the retraction device 10 and arranged symmetrically with respect to the central longitudinal axis of the retraction device 10 (see fig. 4, 5). Here, the axis in the retracting/extending direction is located forward of the central axis of the blocking latch bolts 21, 22, that is, closer to the inner rail 4 than the blocking latch bolts 21, 22. The pivoting elements 45, 46 comprise a front portion 45a, 46a, which front portion 45a, 46a is located in front of the pivot axis and faces the inner rail 4, and a rear portion 45b, 46b, which rear portion 45b, 46b is located behind the pivot axis and faces the corresponding blocking latch bolt 21, 22. The front portions 45a, 46a are received in the interruptions of the base plate of the slide 40, while the rear portions 45b, 46b are located at the rear side of the base plate.

The rear portions 45b, 46b of the pivoting elements 45, 46 in the plane shown in fig. 4 have a receiving portion 45c, 46c for the free end of the corresponding blocking latch bolt 21, 22. The geometry of the receiving portions 45c, 46c is adapted to the geometry of the blocking latch bolts 21, 22; the receiving portions 45c, 46c thus have a recessed shape with lugs 45d, 46d that can engage behind the inserted blocking latch bolts 21, 22. The slide 40 has ramp-like interaction surfaces 49a, 49b in the same plane in which the rear portions 45b, 46b of the pivoting elements 45, 46 can interact with the blocking latch bolts 21, 22. In this context, the receiving portions 45c, 46c in the region of the lugs 45d, 46d and the interacting surfaces 49a, 49b are both at an angle of 45 ° relative to the central longitudinal axis of the retraction device 10.

The pivoting elements 45, 46 have guide pins 45e, 46e on the rear side in the region of the front sections 45a, 46 a. The guide pins 45e, 46e interact with guide tracks 35, 36 formed in the housing 30 of the retraction device 10. The guide curves 35, 36 are configured symmetrically with respect to the central longitudinal axis of the retraction device 10 in a similar manner to the pivoting members 45, 46 and the guide pins 45e, 46 e. The guide curves 35 and 36 include: rear portions 35a, 36a extending substantially axially (and therefore in the retraction/extension direction); portions 35b, 36b which adjoin the guide curves 35, 36 at the front (thus in the direction of the inner rail 4) and taper obliquely towards the central longitudinal axis; and portions 35c, 36c again adjoining at the front and extending transversely to the central longitudinal axis. The inner lateral delimitation of the rear portions 35a, 36a, and therefore the lateral delimitation closer to the central longitudinal axis of the retraction device 10, is formed by elastic tongues 35d, 36d on the inner side.

The blocking latch bolts 21 and 22 have a substantially rectangular cross section. The width of the blocking latch bolts 21, 22 in the region of the free ends decreases in the plane of interaction with the pivot elements 45, 46, so that a symmetrical trapezoidal shape results in said region. The blocking latch bolt, which has a stepped shape on its free end so that the forces acting along the blocking latch bolt and the blocking lever can be transmitted from one side of the retraction device 10 to the other, extends further inwards in a plane behind the pivoting elements 45, 46 (see fig. 3).

The pivoting elements 45, 46 have receiving portions 45f, 46f in a plane in front of the body of the slide 40 (see fig. 5). Said receiving portions 45f, 46f are open towards the outside, that is to say said receiving portions 45f, 46f are open in a direction away from the central longitudinal axis of the retraction device 10, and said receiving portions 45f, 46f are delimited by retaining portions 45g, 46g on the side facing the inner rail 4 and by actuating portions 45h, 46h on the side away from the inner rail 4.

Figure 6 shows a rear view of a retraction device according to the present invention. Said figure 6 corresponds to the view according to figure 3, however the device is now in the standby position. Figure 7 shows a section of the retraction device according to the invention in a standby position. The representation otherwise corresponds to that of fig. 5. The function of the retraction device 10 will be explained below with the aid of fig. 3 to 7.

By means of the interaction between the guide pins 45e, 46e and the guide curves 35, 36, the two pivoting elements 45, 46 in the retracted position according to fig. 3 to 5 are pivoted outwards via the front portions 45a, 46a of said pivoting elements 45, 46, and the retaining cams 7a, 7b of the inner rail 4 are received in the rear receiving portions 45f, 46f of the retaining portions 45g, 46 g. When the respective drawer is now extended, the extension movement is directly transmitted to the inner rail 4. The retaining cams 7a, 7b, which are fixedly arranged on the inner rail 4, carry the pivoting elements 45, 46 and thus the slide 40 along the guide formed by the housing 30 via the retaining portions 45g, 46 g. The guide pins 45e, 46e are guided in the guide curves 35, 36. Furthermore, the helical spring 60 is (further) tensioned upon extraction. The damper rod 52 of the damping element 50 is extended by means of a spring integrated in the damping element 50 until the free end of said damper rod 52 in each case again strikes against the stop 33. In the case of a quick extraction of the drawer, the damper rod 52 may intermittently lose contact with the stopper 33. This is independent of the environment of the extraction movement. However, by means of a corresponding arrangement, the potentially generation of high-intensity forces which may be transmitted to and damage the damping element is avoided.

The pivoting movement of the pivoting elements 45, 46 is brought about by the tapering geometry of the guide pins 45e, 46e as soon as the guide pins 45e, 46e leave the rear sections 35a, 36a and are guided in the intermediate sections 35b, 36 g. The retaining portions 45g, 46g are stably pivoted inwardly towards the central longitudinal axis of the retraction device 10. However, the release of the holding cams 7a, 7b of the inner rail 4 is only performed when the guide pins 45e, 46e are transferred into the portions 35c, 36c extending transversely to the central longitudinal axis. The inner track is separated from the retraction device 10 by the release of the holding cams 7a, 7 b. The guide pins 45e, 46e thus reached the standby position are held on the rearward faces of the laterally extending portions 35c, 36 c. Thus, the coil spring 60 is kept tensioned, and the slider 40 is kept in the reached position. The damper rod 52 of the damping element 50 is in the extended position, the free end of said damper rod 52 being in contact with the stop 33 on the housing 30 of the retraction device 10.

The standby position, as established in fig. 6 and 7, is now maintained until the drawer is closed again, and in this case the retaining cams 7a, 7b are again in contact with the pivoting elements 45, 46 of the slide 40. Here, the holding cams 7a, 7b initially contact the actuating portions 45h, 46h of the pivoting elements 45, 46. With the slide 40 initially held firmly in the axial direction, the pivoting elements 45, 46 are then pivoted outwards, so that the guide pins 45e, 46e enter the central portions 35b, 36b of the guide curves 35, 36 and the retaining portions 45g, 46g of the pivoting elements again engage axially behind the retaining cams 7a, 7 b. The middle and rear guide curve portions 35b, 35a, 36b, 36a allow the retraction movement of the slide 40 caused by the helical spring 60, which in the process entrains the inner rail and therefore the retraction movement of the entire drawer mechanism. This movement is dampened by damping element 50 disposed between slider 40 and housing 30. The movement is ended when the slide 40 meets the housing in the region of the stroke end faces 61a, 61b via its rear end (see fig. 4). By means of the interaction between the guide curves 35, 36 and the guide pins 45e, 46e, in the retracted position the pivoting members 45, 46 are moved back again into the pivoting position of said pivoting members 45, 46.

The initial state according to fig. 3 to 5 can be established in a simple manner if, in the case of an assembly process or after a faulty manipulation, the retraction device 10 is in the retracted position but the inner rail is not coupled to the retraction device 10. For this purpose, the inner rail is moved towards the retraction device 10 (by inserting the drawer). Here, the holding cams 7a, 7b are in contact with the front side portions of the holding portions 45g, 46 g. The front sides of the retaining portions 45g, 46g are shaped such that the retaining portions 45g, 46g thus caused are pushed inwards and here cause a corresponding pivoting movement of the pivoting elements 45, 46 until the retaining cams 7a, 7b have passed the retaining portions 45g, 46 g. The holding portions 45g, 46g then snap back so that the holding cams 7a, 7b are received in the receptacles 45f, 46f in the desired manner. The corresponding pivoting movement of the pivoting elements 45, 46 in the case of this procedure is effected by the resilient tongues 35d, 36d bounding the rear portions 35a, 36a of the guide curves 35, 36 inwardly. Furthermore, the spring tongues 35d, 35d ensure that the retaining portions 45g, 46g return quickly after passing the retaining cams 7a, 7 b.

The blocking latch bolts 21, 22 in the retracted position according to fig. 3 to 5 can be moved into the retraction device 10. Then, the front end portions of the blocking latch bolts 21, 22 are initially received in the receiving portions 45c, 46c of the corresponding pivot members 45, 46. Each of the blocking latch bolts 21, 22 can now in principle be freely movable in a linear manner. This is the case when none of the drawers of the plurality of drawers placed on top of each other is open. In this case, the drawer assigned to the retracting device 10 can be easily opened. The blocking latch bolts, in particular the blocking latch bolts 21, which are initially moved into the retraction device, are arranged above the retraction device 10 and are located by means of gravity in the moved-in position, in which the retraction device 10 is stably moved out by means of the corresponding interaction surfaces 49a, 49b of the slide 40.

The coupling in the effective direction of the blocking latch bolts 21, 22 and the blocking lever by means of a stepped shaping thus results in that only one of the drawers arranged on top of one another can always be opened. The retraction device of the further drawer is blocked by the blocking latch bolt and the blocking lever, so that the corresponding further extension mechanism can no longer be extended.

When one of the blocking latch bolts 21, 22 is now in the blocking position by means of the other drawer which has been opened, said blocking latch bolt 21, 22 cannot be moved in the direction of the linear movement of the blocking latch bolt 21, 22. Thus, by means of the interaction between the blocking latch bolts 21, 22 and the corresponding pivoting elements 45, 46, the extraction movement of the retraction device 10 and thus the release of the retaining cams 7a, 7b is prevented. This is also ensured by the lugs 45d, 46d by means of the shaping of the pivoting elements 45, 46, when the blocking latch bolts 21, 22 are blocked by production tolerances or thermal effects from not reaching the end of the receiving portion completely. Also in this case, optionally after a minimum axial movement of the slide 40, the tapered region of the blocking latch bolt 21, 22 will interact over a large area with the faces of the delimiting lugs 45d, 46d and prevent any pivoting movement (which could otherwise in principle be achieved by means of a spring tongue guiding a bend).

The invention is not limited to the exemplary embodiments shown. In particular, the geometry of the individual elements of the retraction device can also be designed differently.

In summary, it is to be noted that the invention achieves a retraction device which is simple to construct and mechanically robust.

Claims (14)

1. Drawer mechanism (1) with a fixed rail element for attachment to a furniture cabinet, and at least one movable rail element mounted on the fixed rail element, the drawer mechanism (1) comprising an inner rail (4) as the innermost movable rail element to be fastened to an extendable furniture part, the drawer mechanism (1) comprising a retraction device (10) with a spring-loaded slide (40) movable in a retraction/extension direction for temporary coupling to a coupling element (7) provided in the region of the free end of the inner rail (4), wherein the slide (40) can be blocked in a retracted position by a blocking latch bolt (21, 22), which blocking latch bolt (21, 22) can be moved in a guide transversely to the retraction/extension direction, wherein the slider for coupling with the coupling element (7) of the inner track (4) has at least one pivoting element (45, 46), the pivoting element (45, 46) being pivotable about an axis oriented perpendicular to the retraction/extension direction and perpendicular to the direction of movement of the blocking latch bolt (21, 22), the geometry of the pivoting element (45, 46) being adapted to the geometry of the coupling element (7) such that the pivoting element (45, 46) interacts with the coupling element (7) to temporarily couple the slider (40) to the inner track (4), wherein the pivoting element (45, 46) and the guide are provided in such a way that: such that the blocking latch bolt (21, 22) blocks the pivoting movement of the pivoting element (45, 46) in a blocking position, the pivoting element (45, 46) having a blocking portion (45c, 45d, 46c, 46d) which interacts with the blocking latch bolt (21, 22) in the blocking position, the blocking portion (45c, 45d, 46c, 46d) comprising a lug (45d, 46d) which engages behind a free end of the blocking latch bolt (21, 22) in the blocking position, such that the pivoting movement of the pivoting element (45, 46) is avoided even when the latch bolt (21, 22) is slightly displaced outwards.

2. Drawer mechanism according to claim 1, characterized in that the pivoting element has a retaining portion (45g, 46g) which interacts with the coupling element (7) in the protruding movement, wherein the pivoting element (45, 46) is mounted on the slide (40) in such a way that: such that the retaining portion (45g, 46g) in the release position is pivoted relative to the retaining position in the direction of the longitudinal centre axis of the slider (40).

3. Drawer mechanism according to claim 1 or 2, characterized in that the pivoting element (45, 46) has an eccentrically arranged cam pin (45e, 46e), the cam pin (45e, 46e) for controlling the pivoting movement in the movement of the slide (40) in the retraction/extension direction interacting with a stationary curve (35, 36).

4. A drawer mechanism according to claim 3, characterized in that the stationary curve (35, 36) has an elastic limit wall (35d, 36d) in one part (35a, 36a), so that the inner rail (4) can be coupled to the slide (40) in the retracted position of the retraction device (10) by overcoming an insertion force, wherein the holding portion (45g, 46g) of the pivot element (45, 46) is temporarily pivoted, wherein the cam pin (45e, 46e) temporarily deforms the elastic limit wall (35d, 36 d).

5. Drawer mechanism according to claim 1 or 2, characterized by a guide reception (30) in which the slide (40) is mounted so as to be movable in a linear manner in the retraction/extension direction.

6. A drawer mechanism according to claim 3, characterized by comprising a guide receiver (30) in which the slide (40) is mounted so as to be movable in a linear manner in the retraction/extension direction, the stationary curve (35, 36) being configured on the guide receiver (30).

7. Drawer mechanism according to claim 1 or 2, characterized in that the pivoting element (45, 46) has an actuating portion (45h, 46h) which interacts with the coupling element (7) in a retracting movement.

8. Drawer mechanism according to claim 1 or 2, characterized in that the slide (40) has a blocking face (49a, 49b) which interacts with the blocking latch bolt (21, 22) in the blocking position.

9. The drawer mechanism according to claim 8, characterized in that the blocking portion (45c, 45d, 46c, 46d) and the blocking face (49a, 49b) together form a receptacle for the blocking latch bolt (21, 22) in the retracted state of the slide (40), the receptacle being tapered in the direction of the longitudinal center axis of the slide (40).

10. A drawer mechanism according to claim 2, characterized in that the retaining portion (45g, 46g) of the pivoting element (45, 46) is provided on a first side of the slide (40) facing the inner rail and the blocking portion (45c, 45d, 46c, 46d) of the pivoting element (45, 46) is provided on a second side of the slide (40) opposite to the first side.

11. Drawer mechanism according to claim 2, characterized in that two pivoting elements (45, 46) are arranged symmetrically with respect to the longitudinal centre axis of the slide (40).

12. Drawer mechanism according to claim 1 or 2, characterized in that a damping element (50) is received in the slide (40).

13. Drawer mechanism according to claim 12, characterized in that the damper rod (52) of the damping element (50) interacts with the stationary element (33) of the retraction device (10).

14. Drawer mechanism according to claim 13, characterized in that the stationary element (33) is arranged in the retraction direction of the slide (40).