EP3484326B1 - Drive device for a moveable furniture part, and method for opening a moveable furniture part - Google Patents

Description

The present invention relates to a drive device for a movable furniture part, in particular a drawer, with an ejector device which has a driver and a carriage which is pretensioned by an energy storage device and which can be coupled to a movable furniture part via the driver Furniture part is accelerated from a pressurized or closed position a first distance over the slide and the driver in an opening direction and after the first distance the movable furniture part is movable a second distance on which the driver is movable relative to the slide, and a method for Opening a movable furniture part.

DE 10 2010 036 902 A1 discloses a drive device for ejecting a movable furniture part according to the preamble of claim 1.

The DE 20 2013 011 558 U1 discloses a device for opening a movable furniture part, in which a movable furniture part can be moved in the opening direction via an energy storage device via a pull-out element, a damping device being provided in addition to dampening the opening movement of the movable furniture part. The movable furniture part is to be braked via the damping device so that it is not ejected at too high a speed and a hard stop of the movable furniture part is prevented when it is extended into the open position. The speed of the movable furniture part depends on the loading condition, and especially with drawers, the difference between an empty run and a load can be up to 80 kg. The springs of the energy store must be designed for the load condition so that sometimes high forces act when ejecting. In the solution shown, however, it is disadvantageous that the damper already acts during the ejection process and thus withdraws the energy from the spring accumulator. This means that the springs of the energy store have to bring even more energy into the system, which is disadvantageous for the user, since he has to use this energy again when closing the drawer in order to tension the energy store.

In the EP 2 488 062 B1 A sliding arrangement is disclosed in which a sliding arrangement has a sliding piece which can be adjusted between an insertion position and an extension position by means of a spring element. The sliding piece is spring-loaded on a first adjustment path adjusted and adjusted in a subsequent second adjustment path without spring action in a freewheel of the push-out arrangement. This leads to the problem that when the sliding piece is ejected in the opening direction, the springs cause a great acceleration, especially when the ejector device with a drawer is moved in the empty state, since the springs are designed for a loaded state. In an empty state, there is a great acceleration that can cause a hard impact in the maximum opening position.

It is therefore the object of the present invention to create a drive device for a movable furniture part and a method for opening a movable furniture part which enable operating forces that are optimized for the operator of the movable furniture part and which simplify handling.

This object is achieved with a drive device with the features of claim 1 and a method with the features of claim 13.

In the drive device according to the invention, a movable furniture part is accelerated via an ejector device a first distance via a slide and a driver in the opening direction, and after the first distance the movable furniture part is moved a second distance along which the driver can be moved relative to the slide, wherein Braking forces act on the driver and the movable furniture part during the second distance. As a result, the movable furniture part can be accelerated a first distance in the opening direction via the ejector device, in order then to be braked over a second distance after this first distance, the braking forces being significantly lower than the forces in the ejection direction, as there is a movement at the end of the second distance of the movable furniture part is to be allowed in the opening direction. The damping or braking device is therefore only effective after the first distance, which is why the energy store for the ejection device does not have to work against the braking or damping device, but only the inertial forces of the movable furniture part have to be overcome in the area of the first distance.

Braking forces are preferably generated by means of sliding friction. Braking forces can act between the driver and a control element, which can be supported by springs if necessary. Other braking elements or dampers can also be used for braking.

The ejection device preferably has a housing on which the carriage and the driver are guided. This leads to a particularly compact design of the ejection device. The slide and the driver can be coupled via a control element that is movably mounted on the slide. The control element can have a first pin which is guided in a guide track on the housing of the ejection device, and a second pin which engages in a track on the driver. As a result, with a corresponding design of the path on the driver, the driver can be coupled to the slide offset in the pull-in direction to a coupling of the driver to the slide in the pull-out direction. This has the result that a clamping area for the energy storage device is arranged offset in the opening or closing direction with respect to an ejection area of the ejector device during a closing movement. The energy store is tensioned, for example, in a range between 80 to 40 mm in front of the closed position, while the movable furniture part is ejected from the closed position or from an overpressure position up to 40 or 60 mm in the opening direction.

The braking forces are preferably speed-dependent, and higher braking forces are generated at a higher speed of the movable furniture part than at a low speed of the movable furniture part. As a result, the high speeds of the furniture part are braked more strongly than lower speeds, which avoids hard impact noises when moving the movable furniture part in the opening direction. At low speeds it is ensured that the driver of the ejection device reaches its end position so that a new clamping process of the ejection device can be carried out.

The drive device preferably also has a draw-in device by means of which the movable furniture part can be moved into the closed position in a draw-in area. The retraction device can be positioned at a distance from the ejection device, for example on a pull-out guide.

A path for coupling to the control element is preferably formed on the driver and has two angled end sections and a central section. The middle section is at least partially, preferably completely, aligned inclined to the opening and closing direction, so that when moving the driver relative to a control element guided in the path, frictional forces are applied. The angle of inclination to the opening and closing direction of the web can for example be in a range between 1 ° and 25 °, in particular 5 ° to 17 °. The angle of inclination ensures that the control element generates a force component opposite to the direction of movement of the driver. In the first distance, the control element generates a force component in the direction of movement of the driver.

In the method according to the invention for opening a movable furniture part, the movable furniture part is first accelerated along a first path to a first opening position after an ejector device has been unlocked. After the first distance, the movable furniture part is braked along a second distance between the first opening position and a second, further opening position in the opening direction, in order to then decouple the movable furniture part from a driver of the ejector device and move the movable furniture part in the opening direction in freewheel mode. The term "freewheel" refers to the forces through the ejector and not the other forces in the system due to friction, which act on the movable furniture part, for example, through a pull-out guide.

With the method according to the invention, the forces for actuating the movable furniture part can be optimized for the user. In particular, the spring force of the energy store can be kept comparatively low, since it does not have to work against a damping device. If the ejection speed is too high because the movable furniture part is empty, it is slowed down at least somewhat along the second path. As a result, the user has to apply lower braking forces than if the movable furniture part is moved in free-wheeling in the opening direction after the first distance. In addition, a hard and loud stop of the empty movable furniture part at the end of the pull-out path is avoided, which occurs when the movable furniture part is moved freely in the opening direction after the first distance.

Figur 1

eine perspektivische Explosionsdarstellung eines Möbels mit einer erfindungsgemäßen Antriebsvorrichtung;

Figur 2

eine perspektivische Ansicht eines Schubkastens mit zwei Antriebsvorrichtungen;

Figur 3

eine perspektivische Ansicht einer erfindungsgemäßen Antriebsvorrichtung;

Figuren 4A und 4B

zwei Explosionsdarstellungen der Antriebsvorrichtung der Figur 3;

Figur 5

eine Ansicht des Gehäuses der Antriebsvorrichtung der Figur 3;

Figuren 6A und 6B

zwei Ansichten der Antriebsvorrichtung der Figur 3 in einer Schließposition;

Figuren 7A und 7B

zwei Ansichten der Antriebsvorrichtung der Figur 3 in einer Überdrückstellung;

Figuren 8A und 8B

zwei Ansichten der Antriebsvorrichtung der Figur 3 zu Beginn eines Öffnungsvorganges;

Figuren 9A und 9B

zwei Ansichten der Antriebsvorrichtung der Figur 3 beim Entriegeln des Stellelements;

Figuren 10A und 10B

zwei Ansichten der Antriebsvorrichtung der Figur 3 in einer Öffnungsposition;

Figuren 11A und 11B

zwei Ansichten der Antriebsvorrichtung der Figur 3 während des Spannvorganges bei einer Bewegung in Schließrichtung,

Figuren 12A und 12B

zwei Ansichten der Antriebsvorrichtung der Figur 3 in einer Überdrückstellung;

Figuren 13A und 13B

zwei Ansichten der Antriebsvorrichtung der Figur 3 mit blockiertem Schaltelement;

Figur 14

ein Weg-Zeit-Diagramm einer normalen Schließbewegung;

Figur 15

ein Weg-Zeit-Diagramm einer Schließbewegung mit Überdrücken des bewegbaren Möbelteils;

Figur 16

eine Detailansicht der Antriebsvorrichtung der Figur 3 bei der Öffnungsbewegung;

Figur 17

eine Detailansicht der Antriebsvorrichtung der Figur 3 bei einer Öffnungsbewegung;

Figur 18

eine Detailansicht der Antriebsvorrichtung der Figur 3 in einer Öffnungsposition;

Figur 19

ein Geschwindigkeits-Weg-Diagramm eines schweren bewegbaren Möbelteils, und

Figur 20

eine Geschwindigkeits-Weg-Diagramm eines leichten bewegbaren Möbelteils.

The invention is explained in more detail below using an exemplary embodiment with reference to the accompanying drawings:

Figure 1

a perspective exploded view of a piece of furniture with a drive device according to the invention;

Figure 2

a perspective view of a drawer with two drive devices;

Figure 3

a perspective view of a drive device according to the invention;

Figures 4A and 4B

two exploded views of the drive device of Figure 3 ;

Figure 5

a view of the housing of the drive device of Figure 3 ;

Figures 6A and 6B

two views of the drive device of Figure 3 in a closed position;

Figures 7A and 7B

two views of the drive device of Figure 3 in an overpressure position;

Figures 8A and 8B

two views of the drive device of Figure 3 at the beginning of an opening process;

Figures 9A and 9B

two views of the drive device of Figure 3 when unlocking the adjusting element;

Figures 10A and 10B

two views of the drive device of Figure 3 in an open position;

Figures 11A and 11B

two views of the drive device of Figure 3 during the clamping process with a movement in the closing direction,

Figures 12A and 12B

two views of the drive device of Figure 3 in an overpressure position;

Figures 13A and 13B

two views of the drive device of Figure 3 with blocked switching element;

Figure 14

a path-time diagram of a normal closing movement;

Figure 15

a path-time diagram of a closing movement with overpressure of the movable furniture part;

Figure 16

a detailed view of the drive device of Figure 3 during the opening movement;

Figure 17

a detailed view of the drive device of Figure 3 with an opening movement;

Figure 18

a detailed view of the drive device of Figure 3 in an open position;

Figure 19

a speed-path diagram of a heavy movable furniture part, and

Figure 20

a speed-path diagram of a light movable furniture part.

A piece of furniture 1 comprises an in Figure 1 schematically illustrated body 2 on which one or more drawers can be movably mounted as movable furniture parts 3. Each drawer 3 is guided on opposite sides over a pull-out guide 5, the pull-out guide 5 being fixed to a side wall of the body 2 via a bracket 9 and the drawer 3 being fixed to a movable running rail of the pull-out guide 5. In a closed position, a front panel 4 of the drawer is a short distance from the body 2, for example between 1 mm and 6 mm, in order to be pushed slightly further into the body 2 from this closed position into an overpressing position in order to unlock an ejector 6.

As in Figure 2 is shown, there are two ejector devices 6 on the bottom of the drawer, which can be coupled at least in a closing area to an activator 7, which is fixedly connected directly or indirectly to the body 2. Each ejection device 6 can thus be supported on the activator 7 in order to eject the drawer as the movable furniture part 3. Each pull-out guide 5 is in a side frame 8 of the Arranged drawer. It is of course also possible to arrange the ejector 6 stationary on the body 2 and the activator 7 on the drawer 3. In addition, the number and arrangement of the ejector 6 on the movable furniture part 3 can be varied. It is also possible that the ejector device 6 is arranged on the carcass rail or a carcass rail holder of a pull-out slide 5 and the activator is arranged on the drawer rail. A wide variety of arrangement combinations of ejector and activator are known in the prior art, the activator also being able to be formed directly from a movable furniture part or an immovable part, so that the function of the activator does not require a separate component.

Each pull-out guide 5 can be coupled to a self-closing mechanism that pulls a movable running rail of the pull-out guide 5 in a draw-in area in the closing direction and optionally brakes it with a damper. A pull-out guide 5 with a self-closing mechanism is for example in the documents DE 10 2011 053 840 A1 or DE 10 2011 054 441 A1 disclosed, to which reference is made.

In Figure 3 the ejection device 6 is shown, which is arranged in a housing 10. A guide 11 in the form of a web is provided on a longitudinal edge of the housing 10, on which a driver 12 is movably mounted. The driver 12 is connected to a coupling element 13 which forms a contact surface for the activator 7. Since the coupling element 13 has a magnet, both tensile and compressive forces can be transmitted between the driver 12 and the activator 7. To position the movable furniture part 3 in the depth direction, an adjustment mechanism 15 is provided, by means of which the position of the coupling element 13 relative to the driver 12 can be adjusted. The coupling element 13 can alternatively also be designed as a gripper controlled in a guide or another mechanically releasable coupling.

As in the Figures 4A and 4B is shown, is located within the housing 10, a slide 30 which is slidably mounted in a receptacle 20 in the longitudinal direction of the housing 10. On the receptacle 20 of the housing 10 there is a holder 21 on one end face in order to fix one end of an energy store in the form of at least one spring 22, in particular a tension spring. Two springs 22 are provided, each of which is arranged in a spring receptacle 31 on the slide 30. An opposite end The spring 22 is fixed to a spring holder 32 on the slide 30, so that the slide 30 is pretensioned on the housing 10 in the opening direction. The number of springs 22 can be selected depending on the intended use of the drive device. The housing 10 can be closed by a cover 14.

A receptacle 33 for guiding a control element 40 is also provided on the slide 30. Side walls 38, which guide the control element 40 essentially perpendicular to the opening direction, are arranged on the receptacle 33. On the receptacle 33, a receptacle 37 is also provided on a side wall 38, on which a protruding web 43 of the control element 40 can be passed in order to be able to insert the control element 40 into the receptacle 33. The control element 40 is designed in the form of a plate and has protruding sliding elements 44 which rest on the side walls 38 of the receptacle 33.

The control element 40 comprises a first pin 41 which is guided in a guide track 17 on the housing 10. A second pin 42, which is guided on the driver 12, is also provided on the control element 40. For this purpose, a guide track 16 is formed on the driver 12.

A cam guide 34, by means of which a gearwheel 36 is guided, is also provided on the slide 30. The gear 36 engages with a locking projection 35 in the cam guide 34 and is part of a backstop. A rack 19 is formed on the housing 10, as shown in the detailed view of FIG Figure 5 is recognizable. The gear 36 is guided with a pin in a loop-shaped guide track 18 of the housing 10, a section of the guide track 18 running in the tensioning direction past the rack 19, while a section for an opening movement guides the gear 36 at a distance from the rack 19. If a tensioning process of the ejector device 6 is interrupted, the toothed wheel 36 engages in the toothed rack 19 and thus prevents the movable furniture part from being ejected. Such a backstop is for example in the DE 10 2016 107 918 described. Such a backstop is advantageous for the present ejection device, but can optionally also be omitted.

An adjusting element 50 is also provided on the housing 10, which is in an adjusting element receptacle 26 ( Figure 5 ) is held displaceably on the housing 10. For this purpose, a box-shaped section 55 engages in the actuator receptacle 26, while a web 56 is received on an end section 27 of the housing 10. A bearing 52 for a rotatable switching element 60 is formed on the actuating element 50 and has a lever arm on which a pressure piece 62 is provided at the end. An elongated recess 61 is provided on the axis of rotation of the switching element 60, into which a web 66 of a rotary damper 65 engages, which is coupled to the switching element 60 in a rotationally fixed manner. The rotary damper 65 is held on the adjusting element 50 via a bracket 67, so that when the switching element 60 is rotated, the rotary damper 65 is actuated and a braking effect is generated. The rotatable switching element 60 also has a protruding arm 63 which cooperates with stops on the actuating element 50 in order to limit the rotary movement of the switching element 60.

The adjusting element 50 is biased into an initial position by a spring 68. The spring 68 is stored in a spring receptacle 69 on the adjusting element 50 ( Figure 4B ), the spring 68 resting on one end face of the adjusting element 50 and on the opposite side against a wall of the housing 10. The spring 68 is designed as a compression spring and thus biases the adjusting element 50 in the opening direction.

A bow spring 64, which biases the switching element 60 into a first position, is also mounted on the adjusting element 50. One end of the bow spring 64 rests on the arm 63 and is supported on the adjusting element 50 at the opposite end.

A web 53 is also formed on the adjusting element 50, on which a part 51 of a latching receptacle for the pin 41 of the control element 40 is provided. The part 51 of the locking receptacle is designed as a projection. A latching lug 54 is also provided on the web 53, which can ensure that the actuating element 50 is latched on the housing 10.

In the Figures 4A and 4B a control rocker 70 is also shown, which is used to operate the switching element 60. The control rocker 70 is rotatably mounted about an axis of rotation 71 which is inserted into a bearing receptacle 74 on the housing 10. The control rocker 70 has a boom 72 which acts on the switching element 60 in order to pivot it. Furthermore, a guide cam 73 is provided on the control rocker 70, which cooperates with the driver 12. When the driver 12 is moved along the housing 10, the driver 12 can move the control rocker 70 about the axis of rotation 71 pivot and thus actuate the switching element 60. A cam guide 75 for the guide cam 73 is formed on the driver 12 in order to actuate the switching element 60 only over a defined path of the driver 12.

In Figure 5 the housing 10 is shown without the cover 14 and the other components. A guide track 17 for the first pin 41 of the control element 40 is formed on the housing 10. The guide track 17 is designed in the shape of a loop. A first part 23 of a latching receptacle is provided on the guide track 17, on which the pin 41 for latching the ejection device 6 can be placed. The second part 51 of the latching receptacle is formed on the adjusting element 50. When the second part 51 of the latching receptacle is arranged adjacent to the first part 23 of the latching receptacle, the latching receptacle is in a closed position and the pin 41 can be placed there in order to lock the ejector 6 in a closed position. If the actuating element 50 is moved relative to the housing 10, the second part 51 of the latching receptacle moves away from the first part 23, so that the latching receptacle is moved into the unlocking or release position and the pin 41 can no longer be placed in the latching receptacle.

A latching projection 25 is also formed on the housing 10 in the region of the guide track 17, which interacts with the latching lug 54 on the actuating element 50 in order to be able to latch the actuating element 50 in an unlocking or release position for the control element 40.

The functioning of the ejection device 6 will be described below with reference to FIG Figures 6 to 13 explained in more detail, these figures each showing two sectional views through the ejection device 6, some of which are arranged in different planes in order to better follow the position of the pins 41 and 42 in the area of the driver 12 and the guide track 17.

In the Figures 6A and 6B the ejector 6 is in a closed position. In the closed position, the pin 41 of the control element 40 is in the latching receptacle which is formed by the first part 23 on the housing 10 and the second part 51 on the slide 50. The latching receptacle is in the closed position, and the ejection device 6 is latched against the force of the springs 22 via the pin 41 and the latching receptacle. The second pin 42 of the control element is located at an angled end of the guide track 16 on the driver 12.

If the ejection device 6 is to be unlocked, the movable furniture part 3 or the drawer is moved from the closed position into an overpressed position, as shown in FIG Figures 7A and 7B is shown. The control element 40 is pressed in against the force of the springs 22, which are held on the slide 30, the movable furniture part acting on the control element 40 via the driver 12 and the pin 42. By pressing in the movable furniture part 3, the first pin 41 presses against the pressure piece 62 on the switching element 60, which moves the actuating element 50 relative to the housing 10 against the force of the spring 68. As a result of the movement of the adjusting element 50, the second part 51 of the latching receptacle is also displaced relative to the first part 23.

For an opening movement, the pin 41 can now pass through the gap between the first part 23 of the locking receptacle and the second part 51, as shown in FIG Figures 8A and 8B is shown. The driver 12 is coupled to the control element 40 in the pull-out direction via the second pin 42, so that the movable furniture part is ejected by the driver 12. The actuating element 50 is pressed by the spring 68 in the opening direction until the latching lug 54 rests against the latching projection 25 of the housing 10. By locking the adjusting element 50, the locking receptacle remains in a release position. The distance between the two parts 23 and 51 of the locking receptacle is so great that the pin 41 can pass between them.

Due to the springs 22, the carriage 30 with the control element 40, and thereby also the driver 12 with the movable furniture part, is moved further in the opening direction until the in Figure 9 position shown is reached. The first pin 41 on the control element 40 runs against a bevel 57 on the web 53 and thus releases the locking lug 54 from the locking projection 25. As a result, the actuating element 50 can be moved further in the opening direction by the force of the spring 68 in order to close the locking receptacle close.

The movable furniture part 3 is now moved further in the opening direction until the first pin 41 strikes a bevel 45 of the guide track 17 in order to move the control element 40 on the slide 30. As a result, the second pin 42 moves out of the angled end section of the guide track 16 and can thus be moved along the central section of the guide track 16, which is oriented slightly inclined to the closing and opening directions is to move the driver 12 further along the guide 11 on the housing.

In the Figures 10A and 10B a position of the ejection device 6 is shown in which the movable furniture part 3 can move away from the driver 12. In this case, the coupling between driver 12 and activator 7 is released by overcoming the magnetic force of the magnetic coupling element 13 arranged on driver 12. Other decoupling principles are also possible. The second pin 42 has been moved to the angled end section of the guide track 16, and the first pin 41 is located at a pointed end of the guide track 17.

In order to bring the movable furniture part back into a closed position, the activator 7 is moved against the driver 12, which is coupled to the control element 40 via the second pin 42. The control element 40 thus moves together with the slide 30 in the closing direction and thereby tensions the springs 22. The pin 41 moves in the process Figures 10 and 11 on the left side of the loop-shaped guide track 17. When the spring 22 is tensioned, the backstop is also activated with the gearwheel 36, which is moved along the rack 19 on the housing. If the tensioning process is interrupted, the gearwheel 36 of the backstop secures the previously tensioned position of the slide 30.

If the slide 12 is moved further in the closing direction, on the one hand the springs 22 are tensioned via the slide 30, and on the other hand an edge of the driver 12 with the cam guide 75 comes against the guide cam 73 on the control rocker 70. When the driver 12 presses against the guide cam 73 , the control rocker 70 is pivoted about the axis of rotation 71 and presses with the arm 72 against the switching element 60, which is pivoted from the first position, in which the ejection device can be unlocked, into a second position, in which the ejection device 6 is unlocked is not allowed. Although the pin 41 is already placed on the latching receptacle, the ejector 6 cannot be triggered because the switching element 60, which can establish a connection between the pin 41 and the actuating element 50, is arranged in the pivoted position. As a result of the movement of the pin 41 into the latching receptacle, the second pin 42 also comes out of the angled end section of the guide track 16 and can be moved along the driver 12. In this area, for example in an area between the closed position and 40 mm in front of the Closed position, a self-closing mechanism can now be effective, which is arranged, for example, on the pull-out guide. Such a self-closing pulls the movable furniture part into a closed position, a damper preferably being provided which brakes the closing movement of the movable furniture part. As a result, the user no longer needs to apply any actuating force, but can leave the control of the movable furniture part to the self-closing mechanism. If the driver 12 is now slowly moved into the closed position via the self-closing mechanism, the cam guide 75 arrives with a recess in the area of the guide cam 73 so that the control rocker 70 can be pivoted by the force of the bow spring 64, since the switching element 60 is controlled by the force the bow spring 64 is pivoted back into the first position, in which an unlocking of the ejector 6 is made possible. The second pin 42 is then located at the angled end section of the guide track 16, and the in Figures 6A and 6B shown closed position reached. With this type of closing process, the drawer is not pushed in beyond the closed position into the overpressure position, and the user can again unlock the ejector 6 immediately after reaching the closed position, since when the closed position is reached by pivoting the switching element 60 into the first position unlocking is enabled.

It can, however, happen that the movable furniture part is manually moved beyond the closed position into the overpressure position or is moved beyond the closed position because the closing speed of the movable furniture part 3 is too high. Then the in the Figures 13A and 13B shown overpressure reached. In the overpressure position, the control rocker 70 has caused a pivoting of the switching element 60 from the first position into the second position due to the cam guide 75 on the driver 12 and the guide cam 73, as shown in FIG Figures 13A and 13B is shown. The locking receptacle is in the closed position, but the pin 41 is spaced from the locking receptacle. However, the pin 41 does not lie against an end face of the pressure piece 62, but on the side of the pressure piece 62, so that no forces can be applied to the switching element 60 by the pin 41 in the closing direction. If the movable furniture part is released in the overpressure position, the springs 22 ensure that the driver 12 and the control element 40 are moved in the opening direction relative to the housing 10 until the first pin 41 is placed on the latching receptacle, which is supported by the first part 23 is formed on the housing 10 and the second part 51 on the actuating element 50, and that in the figures 6A and 6B is reached. When the pin 41 is placed on the latching receptacle, the driver 12 simultaneously moves along the housing 10, so that the guide cam 73 is released so far via the cam guide 75 that the switching element 60 is moved from the second position to the first position can be pivoted. An opening process can therefore take place again immediately after the closed position has been reached. If it is desired that a new opening can only be carried out after a certain period of time, the pivoting back movement of the switching element 60 can be slowed down by the rotary damper 65, depending on the period of time to be waited for. Such a time delay is only optional, however, since immediate opening is possible even after the movable furniture part has been pushed into the pushed-over position as soon as the movable furniture part has reached the closed position. A linear damper or another mechanical timing element can also be provided for the delayed pivoting back or pushing back movement. Simple mechanical timing elements are, for example, suction cups with a small hole, which release contact with a surface due to the inflowing air, or an elastomer with a slowed return movement. If an elastomer is used, the spring 64 for the return movement can be omitted, since the elastomer itself can have a resilient effect.

In Figure 14 a distance-time diagram is shown in which a closing process is shown in which no overpressure position is reached. The movable furniture part 3 is moved in the closing direction, and the energy storage device is tensioned on the slide 30 in a first section. After the energy store is tensioned with the springs 22 and the ejector 6 is locked via the pin 41 on the locking receptacle, the self-retraction can take over, and the movement of the movable furniture part 3 in the closing direction is braked, as indicated by the curve in the region of the retraction . The movable furniture part 3 then reaches the closed position, and there is no longer any movement until the user moves the movable furniture part 3 into the overpressing position and thus unlocks the ejector device 6.

In Figure 15 it is shown that the closing process can also take place in an overpressure position, the movable furniture part 3 being moved in the closing direction both in the clamping area and in the draw-in area, namely beyond the closed position into the overpressure position. In the overpressed position, the movable furniture part can be held for any length of time until it is released by the user and then moved into the closed position. As soon as the movable furniture part 3 is arranged in the closed position, it can be opened again.

In the illustrated embodiment, the switching element 60 is rotatably mounted. It is also possible to provide a displaceably mounted switching element 60 in a mechanism for the overpressure protection.

In Figure 16 the ejector 6 is shown in a position during the opening movement in which the driver 12 has already moved in the opening direction over part of the distance on the housing 10 and the carriage 30 is arranged on the housing 10 shortly before reaching its end position. The first pin 41 is just moving against the run-up bevel 45 on the guide track 17, so that the control element 40 not only with the slide 30 in the opening direction, but also in the Figure 16 is moved slightly to the right, so that the second pin 42 is moved out of the angled end portion of the guide track 16 and thus a coupling between the control element 40 and the driver 12 is unlocked.

If the driver 12 is now moved further in the opening direction, as shown in FIG Figure 17 is shown, the second pin 42 moves relative to and along the guide track 16, which is aligned slightly inclined to the opening and closing direction, for example at an angle between 1 ° and 20 °, in particular 5 ° to 15 °, so that the Control element 40 in the further opening movement Figure 17 is also moved to the right. Frictional forces act via the control element 40 and the pins 41 and 42, which slightly brake the movement of the driver 12. The slide 30 is only moved slightly in the opening direction in this area, but it can also be arranged stationary. The driver 12 moves together with the movable furniture part 3 further in the opening direction.

In Figure 18 the second pin 42 has reached the second angled end section of the guide track 16, so that the movable furniture part 3 can now be decoupled from the driver 12, similar to what is done with reference to FIG Figure 10 has been described. Optionally, the driver 12 can also be moved further along the housing 10 in the opening direction up to a stop. During a subsequent closing movement, the pin 42 is then attached to the in Figure 18 upper angled end portion of the guide track 16 held in order to move the driver 12 together with the carriage 30 in the closing direction and to tension the springs 22.

In Figure 19 a speed-path diagram for a heavy movable furniture part 3 is shown. The movable furniture part 3 is brought from the closed position into an overpressure position so that the ejection device 6 can eject the movable furniture part. The movable furniture part 3 is accelerated via the ejection device 6 from the overpressure position a first distance to the point S ₁ . In Figure 19 the movable furniture part is heavy, so that the acceleration is low. After reaching the in Figure 16 The position shown is no longer accelerated by the energy store of the ejector on the movable furniture part, but only a slight braking due to the frictional forces when moving the movable furniture part and the driver 12 in the opening direction until the in Figure 18 position shown is reached, which corresponds to point S ₂ in Figure 19 corresponds. The dashed line along the second distance between S ₁ and S ₂ shows the difference when no braking forces act on the movable furniture part 3 via the driver 12. The movable furniture part would be only slightly faster at the end of the path S ₂ , with a decrease in speed also taking place due to the remaining frictional forces on the pull-out guide 5 or on other components that act on the movable furniture part 3.

In Figure 20 is a speed-path diagram for a light movable furniture part 3 is shown in which the same ejector 6 with the same springs 22 is used. The movable furniture part 3 is initially accelerated in the opening direction from the overpressure position or, in the case of an alternative unlocking, from the closed position until the speed V _{max of} the first distance is reached and the in Figure 16 position shown is reached. After the first distance has been reached, the ejection device generates a certain braking effect on the driver 12 via frictional forces, the difference in the final speed at the end of the second distance (S ₂ ) being greater than in FIG Figure 19 , since the movable furniture part 3 is lighter. The dashed line is in Figure 20 a non-braked movable furniture part 3 is shown, while the continuous line between S ₁ and S _{2 shows} the braking effect of the driver 12. By braking the movable furniture part 3, especially in the case of light furniture parts, it can be prevented that they are ejected in the opening direction at too high a speed and could thus hit hard in the maximum opening position.

In order to brake the speed after reaching the maximum speed V _max at the beginning of the second distance, alternatively or additionally further dampers can also be provided, for example air dampers, fluid dampers, linear dampers or rotary dampers. The damping force is preferably speed-dependent, that is to say the higher the speed of the movable furniture part at the end of the first path, the higher the damping forces become in order to slow down the ejection speed more strongly at higher speeds. The damper is preferably designed such that the damper generates damping during the opening movement, while the damper generates almost no damping during the closing movement.

In the Figures 16 to 18 it can be seen that the carriage 30 also moves minimally in the opening direction during the movement of the driver 12 in the opening direction. This has the consequence that during the movement of the driver 12 during the movement in the region of the second path, the spring energy of the springs 22 is reduced. Due to the inclination of the guide track 16, the force component acting on the driver 12 changes due to the pin 42 opposite to the direction of movement of the driver 12.

Instead of a second angled end section, the guide track 16 can also have a gradual narrowing of the cross-section, the pin 42 preferably being held in the guide track 16 in a clamping manner in the end region. As an alternative or in addition, the guide track could have a coating with a plastic, preferably with an elastomer, in order to achieve greater braking and gentle contact of the pin 42 with the end region of the guide track 16.

List of reference symbols

1

Furniture

2

Body

3

Furniture part

4th

Front panel

5

Drawer slide

6th

Ejector

7th

Activator

8th

Side frame

9

Bracket

10

casing

11

guide

12

Carrier

13

Coupling element

14th

cover

15th

Adjustment mechanism

16

Guideway

17th

Guideway

18th

Guideway

19th

Rack

20th

admission

21st

bracket

22nd

feather

23

part

25th

Locking projection

26th

Actuator mount

27

End section

30th

Sledge

31

Spring mount

32

Spring retainer

33

admission

34

Cornering

35

Locking projection

36

gear

37

admission

38

Side wall

40

Control

41

pen

42

pen

43

web

44

Sliding element

45

Ramp

50

Control element

51

part

52

camp

53

web

54

Locking lug

55

section

56

web

57

Ramp

60

Switching element

61

Recess

62

Pressure piece

63

poor

64

Bow spring

65

Rotary damper

66

web

67

boom

68

feather

69

Spring mount

70

Control rocker

71

Axis of rotation

72

boom

73

Guide cam

74

Inventory

75

Cam guide

S ₁

Point

S ₂

Point

V _max

speed

Claims (16)

1. A drive device for a movable furniture part (3), in particular a drawer, having an ejection device (6), which has a driver (12) and a carriage (30) which is pre-tensioned by a force accumulator (20) and can be coupled via a driver (12) to a movable furniture part (3), wherein upon unlocking of the ejection device (6), the movable furniture part (3) is accelerated from an overpressing or closed position over a first travel distance via the carriage (30) and the driver (12) in an opening direction and after the first travel distance, the movable furniture part (3) is movable over a second travel distance, at which the driver (12) is movable in relation to the carriage (30), characterized in that brake forces act on the driver (12) and the movable furniture part (3) during the second travel distance and the driver (12) can be decoupled from the movable furniture part (3) at the end of the second travel distance, whereby the braking or dampening means is active only after the first travel distance..
2. The drive device according to Claim 1, characterized in that the brake forces can be generated by means of sliding friction.
3. The drive device according to Claim 1 or 2, characterized in that the ejection device (6) has a housing (10), on which the carriage (30) and the driver (12) are guided.
4. The drive device according to any one of the preceding claims, characterized in that the carriage (30) is coupled to the driver (12) via a control element (40), which is mounted so it is movable on the carriage (30).
5. The drive device according to Claim 4, characterized in that the control element (40) has a first pin (41), which is guided in a guide path (17) on the housing (10), and a second pin (42), which engages in a path (16) on the driver (12).
6. The drive device according to any one of the preceding claims, characterized in that the brake forces are speed-dependent and at higher speed of the movable furniture part (3), higher brake forces are generated than at lower speed of the movable furniture part (3).
7. The drive device according to any one of the preceding claims, characterized in that a retraction device is provided, by means of which the movable furniture part (3) is movable along a retraction region into the closed position.
8. The drive device according to any one of the preceding claims, characterized in that the force accumulator (22) can be tensioned during a closing movement of the movable furniture part (3), wherein the tensioning region, viewed in the opening or closing direction, is offset in relation to the discharge region of the force accumulator (22), and the tensioning region ends spaced apart from the closed position of the movable furniture part.
9. The drive device according to Claim 4, characterized in that the control element (40) is arranged on the carriage (30) such that the control element (40) is guided on the carriage (30) substantially perpendicularly to the movement direction of the carriage (30).
10. The drive device according to any one of the preceding claims, characterized in that a path (16) for a pin (42) of the control element (40) is formed on the driver (12), wherein the path (16) has two angled end sections and a middle section, which is aligned at least partially inclined in relation to the opening and closing directions.
11. The drive device according to Claim 10, characterized in that the pin (42) transmits a force component in the movement direction of the driver (12) in the region of the first travel distance and transmits a force component opposite to the movement direction of the driver (12) to the driver (12) in the region of the second travel distance.
12. The drive device according to Claim 1, characterized in that the brake forces can be generated by means of a damper.
13. A method for opening a movable furniture part (3), in particular a drawer, having an ejection device (6) according to one of the preceding claims, having the following steps:

    - unlocking the ejection device (6);

    - accelerating the movable furniture part (3) by way of a force accumulator (22) along a first travel distance from an overpressing or closed position up to a first open position;

    - decelerating the movable furniture part (3) along a second travel distance from the first open position to a second open position located farther in the opening direction by means of a dampening or braking means which is active only after the first travel distance;

    - decoupling the movable furniture part (3) from a driver (12) of the ejection device (6) and moving the movable furniture part (3) in the opening direction in free running.
14. The method according to Claim 13, characterized in that at least a part of the brake force is generated by sliding friction, which is active due to movement of a control element (40) in relation to the driver (12) during the movement of the movable furniture part (3) along the second travel distance.
15. The method according to Claim 13 or 14, characterized in that at least a part of the brake force is generated by a damper.
16. The method according to Claim 14, characterized in that at least a part of the brake force is generated by a friction brake.

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