EP3062661B1 - Mechanism for opening a movable furniture component - Google Patents

Description

The invention relates to a piece of furniture with a furniture body and with at least one movable furniture part, in particular a drawer, with a device for opening the movable furniture part which has a guide device for guiding the movable furniture part in the furniture body, the guide device having at least one guide unit composed of at least one longitudinal direction and in the longitudinal direction movable running rail and a body rail attachable to the furniture carcass, and wherein the device has a pull-out unit with a pull-out element having an energy storage device which, when the movable furniture part is opened, exerts an opening force in the opening direction on the movable furniture part, the device having a damping device for damping the opening movement of the movable furniture part, and wherein the pull-out element has a latching pawl coupled to the energy storage device, which can also be moved when the movable furniture part is closed, and the like nd engages in a latching receptacle after a certain closing path, from which it can be disengaged again when the movable furniture part is opened, the energy storage device being rechargeable by moving the latching pawl in the closing direction and the stored energy being available for the opening process when the latching pawl disengages, and wherein the latching pawl is engaged and disengaged from the associated latching receptacle by means of a driver arranged on the running rail, which is moved along with the opening and closing movement of the movable furniture part.

Devices for opening a movable furniture part, which are also referred to as automatic opening systems, have been known for a long time. In particular in the case of large furniture parts, for example drawers, doors or flaps, there is a need for the user to be force-assisted when opening the movable furniture part or for the opening to take place completely automatically. Automatic opening is particularly advantageous in the case of furniture parts designed as drawers that are heavily loaded or are heavily loaded.

the EP 1 743 550 A1 discloses a device for opening a movable furniture part of the type mentioned at the outset, with an automatic displacement mechanism for pull-out guides for furniture parts, such as drawers, that can be pulled out of the body of a piece of furniture. A pawl housing is provided on the guide or body rail or on a center rail, in which a movable pawl component is provided, bi-stable in two end positions spaced apart in the direction of movement of the drawer by a spring arrangement with an elongated helical spring. The pawl component has a receptacle for a driver provided on one of the other rails, that is to say the running rail. During the relative displacement of the rails, the driver moves into the receptacle when the end position is approached and pivots the pretensioned movable pawl component and unlocks it from the assigned end position. Under the action of the spring tension, the pawl component is moved into the other end position and, via the driver held in the receptacle, takes the rail assigned to it with it into the end position of this pull-out furniture part.

the US 2010/264794 A1 discloses a system for assisting the linear movement of a drawer relative to a body, wherein the system comprises a damping device in order to dampen the stop of the drawer when retracting into both the end and the closed position.

the WO 2006/058351 discloses a drive device for a movably mounted furniture part. The movable furniture part is movably mounted on the associated piece of furniture by means of a full extension made up of a running rail, middle rail and body rail. The drive device is designed to move the movable furniture part into the fully open position. The movable furniture part can first be freely movable during the opening process until it is moved further in the direction of its fully open position by means of a releasable coupling device. For this purpose, the drive device has a spring-loaded tilting segment that can be releasably coupled to a driver, the driver tensing the spring when the movable furniture part is closed via the tilting segment, the tilting segment then moving into a self-locking, locked standby position and then releasing the driver.

The object of the invention is to create a piece of furniture with a device for opening a movable furniture part of the type mentioned at the outset, which device offers even greater comfort or higher functionality compared to devices known from the prior art.

This object is achieved by a piece of furniture with the features of independent claim 1. Further developments of the invention are presented in the subclaims.

The furniture according to the invention is characterized in that the running rail has an elongated extension piece at its rear end, which extends in the longitudinal direction over the rear end The end of the running rail protrudes, the driver being seated on the extension piece.

A combination of pull-out unit and damping device is made available, as a result of which the pull-out movement of the movable furniture part into the pull-out position or open position or open position is damped. This prevents a hard stop on the movable furniture part when it moves into the open position.

In a further development of the invention, the pull-out element is assigned to the damping device and, together with it, forms a uniformly manageable assembly. This simplifies the assembly, since in this case only the assembly and not the pull-out unit on the one hand and the damping device on the other hand have to be assembled. In addition, the space requirement of such an assembly is less than in the case where the pull-out element and the damping device are separate components.

In a particularly preferred manner, the pull-out element is integrated into the damping device.

In a further development of the invention, the damping device has at least one damper, which in turn has a damper housing in which a damper piston is displaceably mounted, which is connected to a piston rod led out of the damper.

It is possible for the damping device to have at least one damper which is designed as a rotary damper. A combination of a linear damper with a rotary damper is also possible.

The damper is expediently designed as a fluid damper. Air or hydraulic fluid, for example oil, are suitable as damping media.

In a particularly preferred manner, the pull-out element is designed as a separate component from the damping device and is coupled to the damping device via coupling means in such a way that the opening force generated by the pull-out element in the opening direction via the coupling means dampens the opening movement by means of the damping device. When it is actuated and the opening force is generated in the opening direction, the pull-out element can thus cause the damping device to be activated by means of the coupling means, as a result of which the movement into the open position can be dampened.

In a particularly preferred manner, the coupling means have a sliding element which is mounted displaceably on a sliding guide and which, on the one hand, is coupled in terms of movement to the pull-out element and, on the other hand, is coupled to the piston rod of the damper.

The pull-out element expediently has a pull-out spring. Alternatively, however, other energy storage elements would also be conceivable, for example rubber-elastic elements or the like.

In a particularly preferred manner, the latching pawl is coupled to the piston rod of the damper.

Figur 1

eine schematische, perspektivische Darstellung eines nicht zur Erfindung gehörenden Ausführungsbeispiels des Möbels,

Figur 2

eine schematische Draufsicht auf die Vorrichtung von Figur 1,

Figur 3

eine schematische, perspektivische Darstellung auf ein bevorzugtes Ausführungsbeispiel des erfindungsgemäßen Möbels mit einer Vorrichtung zum Öffnen eines bewegbaren Möbelteils,

Figur 4

eine schematische, perspektivische Darstellung auf die Vorrichtung von Figur 3, beim Einfahren der Schubladenschiene in die Offenstellung und

Figur 5

eine perspektivische, schematische Darstellung der Vorrichtung von Figur 3, wobei die Schubladenschiene in der Offenstellung ist.

A preferred embodiment of the invention is shown in the drawing and is explained in more detail below. In the drawing show:

Figure 1

a schematic, perspective representation of an embodiment of the furniture not belonging to the invention,

Figure 2

a schematic plan view of the device of Figure 1 ,

Figure 3

a schematic, perspective illustration of a preferred embodiment of the furniture according to the invention with a device for opening a movable furniture part,

Figure 4

a schematic, perspective view of the device of FIG Figure 3 , when moving the drawer rail into the open position and

Figure 5

a perspective, schematic representation of the device of FIG Figure 3 with the drawer rail in the open position.

the Figures 1 and 2 show an exemplary embodiment of a piece of furniture not belonging to the invention with a device 11 for opening a movable furniture part 12. The device 11 can be used, for example, on a movable furniture part 12 designed as a drawer. It is of course possible to use the device 11 on other movable furniture parts, for example a door or a flap.

The invention is described in more detail below using the example of a movable furniture part 12 designed as a drawer.

The drawer is mounted displaceably relative to a furniture body 14 by means of a guide device 13. The guide device 13 comprises a plurality of guide units 15 which are assigned to mutually opposite side edges of the drawer.

The guide units 15 each have a carcass rail 16, which is fastened in a fixed position by means of suitable fastening means on an associated side wall of a drawer receptacle formed in the furniture carcass 14. On the body rail 16, for example, a middle rail 17 is displaceably mounted, on which in turn a running rail 18 is displaceably guided by means of bearing means. The running rail 18, which can also be referred to as a moving rail or, in the present case, a drawer rail, is assigned to the drawer and runs below the bottom of the drawer in the depth direction. The combination of body rail 16, middle rail 17 and running rail 18 is called full extension. However, it is also conceivable to use guide units 15 without a central rail 17.

A pull-out unit 19 is provided in order to be able to extend the running rail 18 together with the drawer into the open position after a certain opening path has been covered, either automatically or with the aid of force. When the drawer is opened after having covered a defined opening path, an opening force is exerted on the drawer in the opening direction. The pull-out unit 19 has a pull-out element 20 which is equipped with an energy storage device and which, when opened the drawer exerts an opening force on the drawer in the opening direction.

A retraction unit can be provided in order to also support the running-in of the running rail 18 together with the drawer into the closed position. When closing the drawer after having covered a defined closing path, a closing force is exerted on the drawer in the closing direction. The draw-in unit also has a draw-in element (not shown) equipped with an energy storage device, which exerts a closing force on the drawer in the closing direction when the drawer is closed.

The device 11 further comprises a damping device 21 for damping the extension movement of the running rail 18 and thus of the drawer in order to prevent hard stops on the extension limiter when it is extended into the open position.

The pull-out element 20 of the pull-out unit 19 is assigned to the damping device 21 and together with it forms a uniformly manageable assembly 22. The pull-out unit 19 has a pull-out unit housing 23 in which the assembly of pull-out element 20 and damping device 21 is arranged. As in particular in Figure 2 and in the following in connection with the preferred exemplary embodiment still to be described in FIGS Figures 3 to 5 shown, the pull-out unit 19 is arranged in the front area of the drawer receptacle formed in the furniture body. This makes it possible to mount the pull-out unit 19 directly with its pull-out unit housing 23 on the bottom of the drawer receptacle. Alternatively, it is possible to first attach the pull-out unit 19 to a mounting plate and then to mount this on the bottom of the drawer receptacle. Another alternative is to connect the mounting plate equipped with the pull-out unit 19 to the body rail 16.

The damping device 21 has at least one damper 24, which is designed, for example, as a fluid damper. Air or hydraulic fluid, for example oil, is suitable as the damping medium. The damper 24 is expediently designed in the manner of a working cylinder, with a damper housing 25 and a damper piston (not shown) that is displaceably guided in the damper housing 25. The damper piston is in turn connected to a piston rod 26 which is led out of the damper housing 25. The piston rod 26 is connected to a latching pawl 28 via coupling means 27, which can also be moved when the piston rod 26 is pushed out of the damper housing 25 and, after a certain pushing-out path, engages in a latching receptacle 29, which can be formed on the pull-out unit housing 23, for example. For this purpose, the latching pawl 28 has a latching finger 30 which automatically engages when the latching receptacle 29 is reached. If the running rail 18 and thus the drawer is moved back from its open position into the closed position, the latching pawl 28 is decoupled from the running rail 18. During the extension process, the latching pawl 28 is taken along by a catch 31, which causes the latching pawl 28 to disengage from the latching receptacle 29 takes place. As in particular in Figure 1 shown, the catch hook 31, which could also be referred to as a driving pin, is attached to the rear end of the running rail 18.

The coupling means 27, via which the piston rod 26 is coupled to the latching pawl 28, have a sliding element 32 which is displaceably guided on a sliding guide 33.

As in particular in Figure 2 shown, the sliding guide 33 is arranged on the pull-out unit housing 23. The sliding element 32 has a first coupling section 34 which is coupled to the latching pawl 28. Overall, the sliding element 32 is designed in the manner of a rail, the first coupling section 34 merging into an elongated guide section 35 oriented essentially parallel to the displacement axis of the drawer. At the other end of the guide section, the second coupling section 36, which is coupled to the piston rod 26, projects therefrom. The pull-out element 20 has an energy store in the form of a pull-out spring (not shown). The extension spring is charged or tensioned when the damper piston or piston rod 26 is pushed out.

When the drawer is extended, the latching pawl 28 is locked into the latching receptacle 29. The latching pawl 28 is separated from the running rail 18. The extension spring is charged, for example a compression spring is tensioned. When the drawer is opened further, the catch hook 31 comes into contact with the latch 28 and causes it to disengage from the latch 29 applied with an opening force. The latching pawl 28 is moved along with the running rail 18 by the hooked catch hook 31, whereby the sliding element 32 is also displaced. The second coupling section 36 presses the previously extended piston rod 26 of the damper 24 into the damper housing 25, thereby damping the opening movement. This prevents a hard stop against the opening limit of the drawer.

the Figures 3 to 5 show a preferred embodiment of the furniture according to the invention. It is a pull-out unit 19 is provided, which has a pull-out unit housing 23 which is fastened to the bottom of the drawer receptacle by suitable fastening means, for example fastening screws. As in the first exemplary embodiment described above, the pull-out unit 19 has a pull-out element 20 which has an energy store in the form of a pull-out spring, for example a compression spring. The pull-out element 20 is integrated into the damper 24 of a damping device 21 and, together with the damper 24, forms an assembly that can be handled in a uniform manner.

As in the Figures 3 to 5 As shown, in addition to the pull-out unit 19, a pull-in unit 37 is also provided, which is mounted almost the wrong way round to the pull-out unit 19. The retraction unit 37 is essentially identical to the pull-out unit 19 and also has a damping device 38 with a damper 39, which has a damper housing 40 and a piston rod 41 extending out of the damper housing 40. The piston rod 41 is in turn connected to a latching pawl 42.

Now back to the pull-out unit 19: As in particular in Figure 3 As can be seen, an elongated extension piece 43 is attached to the rear end of the running rail 18, on which a driver 44 is arranged at the rear end.

When the drawer is opened, the latching pawl 28 engages in the latching receptacle 29 on the pull-out unit housing 23. The extension spring is stretched. The piston rod 26 of the damper 24 is extended. Upon further opening, the driver 44 comes into contact with the latching pawl 28, as a result of which it is disengaged from its latching receptacle 29. The spring force stored in the pull-out spring is thus available, which the running rail 18 and thus the connected drawer automatically or moved into the open position as a force support for the user. Since the piston rod 26 is moved back into the damper 24 with the latching pawl 28, the damper piston, which is mounted displaceably in the damper housing 25, is also displaced, thereby damping the extension movement of the drawer. Because the piston rod 26 can only be extended a certain distance from the damper housing 25, the extension piece 43 with the driver 44 is necessary. If the driver 44 were directly on the running rail 18, when the pull-out unit 19 was positioned, due to the limited travel of the piston rod 26, it would not be possible to extend the drawer into the fully open position. However, this is prevented by the extension piece 43 and the drawer can, as in FIG Figure 5 shown, can be moved fully into the open position.

When the drawer is closed, the latch 28 is moved along in the closing direction, as a result of which the piston rod 26 is pulled out of the damper housing 25 again. Once the position of the latching receptacle 29 is reached, the latching pawl 28 engages and separates from the extension piece 43 or its driver 44. When closing further, a catch hook (not shown) located on the opposite side wall of the running rail 18 moves into the latched latching pawl 42 of the Feed unit 37 and causes it to disengage. As a result, the spring force of the draw-in spring is available so that the drawer moves into the closed position automatically or with power assistance for the user. At the same time, the closing movement is damped, since the piston rod 41 is moved back into the damper housing 40, whereby the damper piston arranged in the damper 39 causes damping.

In a further exemplary embodiment, not shown, the damping device has a rotary damper which dampens the opening movement of the movable furniture part, in particular the drawer. On the body rail there is a mounting plate, for example in the form of a sheet metal piece, for attaching the pull-out unit. The rotary damper has a turntable which is arranged on the housing of the pull-out unit, in particular on its upper side. A driver or catch hook is arranged on the running rail, which engages in the turntable when the drawer is opened, the movement of the drawer being braked and, for example, brought into the open end position by an integrated spring.

Claims (9)

1. Piece of furniture, with a furniture carcass and with at least one movable furniture part, in particular a drawer, with a device for opening the movable furniture part (12) which has a guiding device (13) for guiding the movable furniture part (12) in the furniture carcass (14), wherein the guiding device (13) has at least one guide unit (15) made up of a running rail (18) having a longitudinal direction and movable in the longitudinal direction, and a carcass rail (16) attachable to the furniture carcass (14), and wherein the device (11) has a pull-out unit (19) with a pull-out element (20) which has an energy store which, during opening of the movable furniture part (12), exerts an opening force on the movable furniture part (12) in the opening direction, wherein the device (11) has a damping device (21) for damping the opening movement of the movable furniture part (12), and wherein the pull-out element (20) has an engaging pawl (28) coupled to the energy store and which, on closing of the movable furniture part (12), can accompany its movement and, after a certain closing distance, engages in a locking recess (29), from which it is able to disengage again on opening of the movable furniture part (12), wherein the energy store may be charged up by the movement of the engaging pawl (28) in the closing direction, and the stored energy is available for the opening movement on disengaging of the engaging pawl (28), and wherein the engaging and disengaging of the engaging pawl (28) in the assigned locking recess (29) is effected by means of a driver (44) mounted on the running rail (18) and accompanying the opening and closing movement of the movable furniture part (12), characterised in that the running rail (18) has at its rear end an elongated extension piece (43) which, in the longitudinal direction, extends beyond the rear end of the running rail, wherein the driver (44) rests on the extension piece (43).
2. Piece of furniture according to claim 1, characterised in that the pull-out element (20) is assigned to the damping device (21) and, together with the latter, forms a uniform manageable assembly.
3. Piece of furniture according to claim 1 or 2, characterised in that the pull-out element (20) is integrated with the damping device (21).
4. Piece of furniture according to any of the preceding claims, characterised in that the damping device (21) has at least one damper (24) which, for its part, has a damper housing (25) in which is slidably mounted a damper piston, which is connected to a piston rod (26) guided out of the damper (24).
5. Piece of furniture according to any of the preceding claims, characterised in that the damping device (21) has at least one damper (24) which is in the form of a rotation damper.
6. Piece of furniture according to any of the preceding claims, characterised in that the pull-out element (20) is in the form of a component separate from the damping device (21), and is so connected to the damping device (21) via coupling means (27) that the opening force generated by the pull-out element (20) in the opening direction through the coupling means (27) produces a damping of the opening movement by means of the damping device (21).
7. Piece of furniture according to claim 6, characterised in that the coupling means (27) have a slide element (32) mounted movably on a sliding guide (33) which is movement-coupled on one side to the pull-out element (20) and on the other side is coupled to the piston rod (26) of the damper (24).
8. Piece of furniture according to any of the preceding claims, characterised in that the energy store of the pull-out element (20) is in the form of a pull-out spring.
9. Piece of furniture according to any of the preceding claims, characterised in that the engaging pawl (28) is coupled to the piston rod (26) of the damper (24).

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