EP3684224B1 - Drive device for a movable furniture part - Google Patents

Description

The present invention relates to a drive device for a movable furniture part with a lockable ejection device, by means of which the movable furniture part can be ejected from a closed position by a force accumulator in the opening direction, the ejection device having a control element which can be coupled to the movable furniture part and which is locked in a locked position by the force accumulator Position of the ejection device is held on a multi-part locking receptacle, the control element having a pin which is guided in a guideway with the locking receptacle and an electromechanical actuator is provided for unlocking the ejection device, via which part of the locking receptacle can be moved.

the DE 10 2009 026 141 A1 discloses a locking fitting for movable furniture parts, by means of which the movable furniture part can be ejected from a closed position in the opening direction. For this purpose, an energy accumulator is provided, which is coupled to a switching element that can be moved along a switching curve with a loop-shaped section. A detent depression is provided on the switching curve, on which the switching element can be locked in order to lock the movable furniture part in a closed position via the switching element. If the switching element is to be unlocked, the switching element can be moved out of the detent recess via a trigger so that it is transferred to the switching curve and the moveable furniture part is ejected by the force of the energy store. The unlocking system shown has the disadvantage that the trigger has to move the switching element against the force of the energy store, which places considerable demands on the forces that the trigger must overcome, since the force store is intended to drive the movable furniture part in the opening direction and this also in the loading condition must experience a certain acceleration.

An ejection device for movable furniture parts with a power transmission unit discloses EP 2 364 614 .

An ejection device for movable furniture parts with an electromechanical actuator is disclosed in the EP 2 364 614 A2 .

It is therefore the object of the present invention to create a drive device for a movable furniture part which enables improved unlocking of a lockable ejection device.

This object is achieved with a drive device having the features of claim 1.

In the drive device according to the invention, in order to unlock the ejection device, part of a locking receptacle is moved via an electromechanical actuator in order to engage a control element that is locked in the locking receptacle to release. As a result, the control element does not have to be moved by the electromechanical actuator against the force of the force accumulator to eject the movable furniture part, but only part of the locking receptacle is moved, which is possible with significantly lower forces. As a result, the electromechanical actuator can be designed for lower forces, and the energy consumption of the actuator turns out to be lower, so that the use of batteries for the electromagnetic actuator is possible. The drive device has a self-closing mechanism which pulls the movable furniture part into a closed position, with a damper being provided which brakes the closing movement of the movable furniture part.

The latching receptacle preferably has a second part with a guide surface which is oriented at an angle to the effective direction of the force accumulator and by means of which the control element can be moved to a guide track. For the unlocking then only the first part of the locking receptacle has to be moved, so that the control element is moved by the force of the energy accumulator along the angled guide surface into the guide track. The guide surface can be aligned, for example, at an angle of between 10° and 80° to the direction of action of the energy accumulator; the guide surface is preferably arranged at an angle of between 50° and 80° to the direction of action of the energy accumulator. The guide surface can be flat or curved in order to guide the control element accordingly.

The movable part of the latching receptacle is preferably arranged laterally on the control element, viewed in the direction of action of the energy store. If the control element has a pin that is guided in a guideway with the snap-in mount, a line can be drawn through a center point of the preferably cylindrical pin, and the movable part of the snap-in mount is then arranged at a distance from this line, in particular the second part of the Snap-in receptacle contact the pin of the control element in an angular range between 20° and 85°, in particular 40° to 80°, from the line parallel to the direction of action of the force accumulator through the center point of the pin. As a result, the forces for moving the movable part of the latching receptacle can be kept low. Of course, instead of a pin having a cylindrical shape, it is also possible to use a different geometry for the pin in the guideway.

In a further refinement, an actuating element is provided which forms the movable part of the locking receptacle and is held on a housing or a guide element in a displaceable, pivotable or rotatable manner. The actuating element can be arranged in a protected manner in an interior space of a housing and can be prestressed into an initial position by a spring.

As a result, after the movement via the electromechanical actuator, the spring can be reset, with the forces of the spring being significantly lower than the spring forces of the energy store for ejecting the movable furniture part.

Optionally, the ejection device can also be unlocked mechanically, so that the user has the option of effecting unlocking via the electromechanical actuator or via a pressing-in movement. For a mechanical unlocking, the control element can be moved against the force of the energy store by moving the movable furniture part into an overpressure position in order to unlock the ejection device. Since the control element is moved, the forces of the force accumulator have to be overcome here.

For independent power supply, the electromechanical actuator can be powered by a battery. This eliminates the need for wiring. Furthermore, a sensor for triggering the electromechanical actuator can be provided, for example on a handle element of a drawer, a sensor for detecting a force on the movable furniture part or a sensor for detecting a movement of the movable furniture part. In addition, the sensors can also react to noise, speech, gestures or other signals. The sensor can be designed as a radar sensor, capacitive or inductive sensor, image sensor, camera, magnetic sensor, force sensor or another sensor known in the prior art.

The electromechanical actuator preferably comprises a lifting magnet or an electric motor in order to move the movable part of the locking recess for unlocking when current is briefly applied.

In a further refinement, the drive device can comprise at least two ejection devices whose electromechanical actuators can communicate via signals for the simultaneous unlocking of the ejection device. Such communication can take place wirelessly via radio or via signal cables. This makes it possible, in a piece of furniture such as a drawer, to effect an ejection movement simultaneously on the right and left side, without the two ejection devices having to be mechanically coupled. Signal transmission to other drawers is also possible, so that, for example, a drawer and an internal drawer behind it can be ejected in a time-controlled sequence. It is also possible that several drawers, each equipped with ejection devices and having a common front panel, can be triggered simultaneously. The most varied constellations of ejection sequences of several movable furniture parts are conceivable through the comprehensive interconnection of ejection devices.

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 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

eine perspektivische Ansicht einer erfindungsgemäßen Antriebsvorrichtung;

Figuren 20A und 20B

zwei Ansichten der Antriebsvorrichtung der Figur 19, und

Figuren 21 bis 23

mehrere Detailansichten der Antriebsvorrichtung der Figur 19 beim Entriegeln des Steuerelementes.

The invention is explained in more detail below using several exemplary embodiments with reference to the accompanying drawings. Show it:

figure 1

an exploded perspective 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;

Figures 4A and 4B

two exploded views of the drive mechanism figure 3 ;

figure 5

a view of the housing of the drive device 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 overdrive 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 actuating 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 overdrive 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 excess pressure of the movable furniture part;

figure 16

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

figure 17

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

figure 18

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

figure 19

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

Figures 20A and 20B

two views of the drive device of figure 19 , and

Figures 21 to 23

several detailed views of the drive device of figure 19 when unlocking the control.

A piece of furniture 1 comprises an in figure 1 Schematically shown body 2, on which one or more drawers can be stored as movable furniture parts 3 movable. Each drawer is guided on opposite sides via a pull-out guide 5, with the pull-out guide 5 being fixed to a side wall of the body 2 via a bracket 9 and the drawer 3 is fixed to a movable rail of the pull-out guide 5. In a closed position, a front panel 4 of the drawer is at a small distance from the body 2, for example between 1 mm and 6 mm, in order to be pressed slightly further into the body 2 from this closed position into an overpressure position in order to unlock an ejection device 6.

As in figure 2 is shown, there are two ejection devices 6 on the underside of a bottom of the drawer, which can be coupled to an activator 7, at least in a closing area, which is permanently 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 arranged in a side frame 8 of the drawer. It is of course also possible to arrange the ejection device 6 in a stationary manner on the body 2 and the activator 7 on the drawer. In addition, the number and arrangement of the ejection devices 6 on the movable furniture part 3 can be varied. It is also possible that the ejection device 6 is arranged on the cabinet rail or a cabinet rail holder of a pull-out guide and the activator is arranged on the drawer rail. A wide variety of arrangement combinations of ejection device and activator are known in the prior art, with the activator also being able to be formed directly by 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, which pulls a movable rail of the pull-out guide 5 in a catchment area in the closing direction and optionally slows it down 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 . On a longitudinal edge of the housing 10, a guide 11 is provided in the form of a web 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 . An adjustment mechanism 15 is provided for positioning the movable furniture part 3 in the depth direction. by means of which the position of the coupling element 13 relative to the driver 12 can be adjusted. Alternatively, the coupling element 13 can also be designed as a gripper controlled in a guide or as another mechanically detachable coupling.

As in the Figures 4A and 4B is shown, is located within the housing 10, a carriage 30 which is mounted in the longitudinal direction of the housing 10 in a receptacle 20 to be displaceable. 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 accumulator in the form of at least one spring 22, in particular a tension spring. In this case, two springs 22 are provided, which are each arranged in a spring receptacle 31 on the carriage 30 . An opposite end of the spring 22 is fixed to a spring holder 32 on the carriage 30 so that the carriage 30 is biased in the opening direction on the housing 10 . The number of springs 22 can be selected depending on the intended use of the drive device. The housing 10 can be closed using a cover 14 .

A receptacle 33 for guiding a control element 40 is also provided on the carriage 30 . Side walls 38 are arranged on the receptacle 33 and cause the control element 40 to be guided essentially perpendicularly to the opening direction. Also provided on the receptacle 33 is a receptacle 37 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 plate-shaped and has protruding sliding elements 44 which bear against the side walls 38 of the receptacle 33 .

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

A cam guide 34 is also provided on the carriage 30, by means of which a gear wheel 36 is guided. 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 detail view of FIG figure 5 is recognizable. The gear 36 is guided with a pin in a loop-shaped track 18 of the housing 10, with a portion of the Guide track 18 runs past the toothed rack 19 in the clamping direction, while a section for an opening movement guides the gear wheel 36 at a distance from the toothed rack 19 . If a clamping process of the ejection device 6 is aborted, the gear 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 actuating element 50 is also provided on the housing 10, which is in an actuating element receptacle 26 ( figure 5 ) is slidably held on the housing 10. For this purpose, a box-shaped section 55 engages in the adjusting element receptacle 26 , while a web 56 is accommodated 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 elongate recess 61 is provided on the axis of rotation of the switching element 60, in 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 actuating element 50 via a cantilever 67, so that when the switching element 60 rotates, the rotary damper 65 is actuated and generates a braking effect. 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 actuating element 50 is biased into an initial position by a spring 68 . The spring 68 is stored in a spring seat 69 on the actuating element 50 ( Figure 4B ), wherein the spring 68 rests on one end face on the actuating element 50 and on the opposite side on a wall of the housing 10. The spring 68 is designed as a compression spring and thus biases the actuating element 50 in the opening direction.

Also mounted on the actuating element 50 is a bracket spring 64 which prestresses the switching element 60 into a first position. The bow spring 64 rests with one end on the arm 63 and is supported on the actuating element 50 at the opposite end.

Also formed on the actuating element 50 is a web 53 on which a part 51 of a locking 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 and can ensure that the actuating element 50 latches on the housing 10 .

In the Figures 4A and 4B a control rocker 70 is also shown, which is used to actuate the switching element 60 . The control rocker 70 is rotatably mounted about an axis of rotation 71 which is inserted into a bearing mount 74 on the housing 10 . The control rocker 70 has a cantilever 72 which acts on the switching element 60 in order to pivot it. Also provided on the control rocker 70 is a guide cam 73 which interacts with the driver 12 . If the driver 12 is moved along the housing 10, the driver 12 can pivot the control rocker 70 about the axis of rotation 71 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 guideway 17 is loop-shaped. A first part 23 of a locking receptacle is provided on the guide track 17, on which the pin 41 for locking the ejection device 6 can be placed. The second part 51 of the locking receptacle is formed on the actuating element 50 . When the second part 51 of the latch receiver is located adjacent to the first part 23 of the latch receiver, the latch receiver is in a closed position and the pin 41 can be deposited there 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 locking receptacle is removed from the first part 23, so that the locking receptacle is moved into the unlocked or release position and the pin 41 can no longer be placed in the locking receptacle.

Also formed on the housing 10 in the area of the guide track 17 is a locking projection 25 which interacts with the locking lug 54 on the actuating element 50 in order to be able to lock the actuating element 50 in an unlocking or release position for the control element 40 .

The functioning of the ejection device 6 in the case of a mechanical triggering is described below with reference to FIG Figures 6 to 13 explained in more detail, where these figures each show two sectional views through the ejection device 6, some of which are arranged in different planes in order to be able to better follow the position of the pins 41 and 42 in the area of the driver 12 and the guideway 17.

In the Figures 6A and 6B the ejection device 6 is in a closed position. In the closed position, the pin 41 of the control element 40 is in the latching receptacle formed by the first part 23 on the housing 10 and the second part 51 on the carriage 50 . The locking receptacle is in the closed position and the ejection device 6 is locked against the force of the springs 22 via the pin 41 and the locking 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 overpressure position, as is shown in FIGS 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 carriage 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, the first pin 41 presses against the pressure piece 62 on the switching element 60 so that the actuating element 50 moves relative to the housing 10 against the force of the spring 68 . As a result of the movement of the actuating element 50, the second part 51 of the locking 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 is shown in FIGS Figures 8A and 8B is shown. The driver 12 is coupled via the second pin 42 to the control element 40 in the pull-out direction, so that the movable furniture part is ejected by the driver 12 . The actuating element 50 is pressed in the opening direction by the spring 68 until the latching lug 54 rests against the latching projection 25 of the housing 10 . Due to the locking of the actuating 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 large 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, further in the opening direction moves until the in figure 9 shown position is reached. The first pin 41 on the control element 40 runs against a chamfer 57 on the web 53 and thus releases the locking lug 54 from the locking projection 25. This allows the actuating element 50 to 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 hits a run-up slope 45 of the guide track 17 in order to move the control element 40 on the carriage 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 middle section of the guide track 16, which is aligned slightly inclined to the closing and opening direction, to move the driver 12 further along the guide 11 on the to move 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 be removed from the driver 12 . The second pin 42 has been moved to the angled end portion of the guideway 16, and the first pin 41 is located at a pointed end of the guideway 17.

In order to bring the movable furniture part back into a closed position, the activator 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 carriage 30 in the closing direction and tensions the springs 22. The pin 41 moves in the figures 10 and 11 on the left side of the loop-shaped guideway 17. When the spring 22 is tensioned, the backstop is also activated with the gearwheel 36, which is moved along the toothed rack 19 on the housing. If the clamping process is interrupted, the gear wheel 36 of the backstop secures the previously clamped position of the carriage 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 boom 72 against the switching element 60, which is from the first position in which unlocking the ejection device is possible, in a second position is pivoted in which unlocking of the ejection device 6 is not allowed. Although the pin 41 has already been placed on the latching receptacle, the ejection device 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 displaced 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 is now effective, which is arranged, for example, on the pull-out guide. Such a self-closing mechanism pulls the movable furniture part into a closed position, with a damper being provided which brakes the closing movement of the movable furniture part. As a result, the user no longer needs to exert any actuating force, but can instead 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 reaches the area of the guide cam 73 with a recess, so that the control rocker 70 can be pivoted by the force of the clip spring 64, since the switching element 60 is controlled by the force of the clip spring 64 is pivoted back into the first position, in which unlocking of the ejection device 6 is made possible. The second pin 42 is then located at the angled end portion of the guide track 16, and it is the in Figure 6A and 6B shown closed position is reached. With this type of closing process, the drawer is not pushed in beyond the closed position into the push-over position, and the user can unlock the ejection device 6 again immediately after reaching the closed position, since when the closed position is reached, the switching element 60 pivots into the first position unlocking is enabled.

It can, however, happen that the movable furniture part is moved manually beyond the closed position into the push-over position or is moved beyond the closed position due to the closing speed of the movable furniture part 3 being too high. Then the in the Figures 13A and 13B shown overpressure position is reached. In the override position, the control rocker 70 has caused the switching element 60 to pivot from the first position to the second position due to the cam guide 75 on the driver 12 and the guide cam 73, as is shown in FIGS Figures 13A and 13B shown is. The latch mount is in the closed position, but the pin 41 is arranged at a distance from the locking receptacle. However, the pin 41 is not in contact with an end face of the pressure piece 62 but rather on the side of the pressure piece 62 , so that no forces can be applied by the pin 41 to the switching element 60 in the closing direction. If the movable furniture part is released in the over-pressing 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 formed by the first part 23 is formed on the housing 10 and the second part 51 on the actuating element 50, and in the Figures 6A and 6B shown position is reached. When the pin 41 is laid down on the snap-in receptacle, the driver 12 simultaneously moves along the housing 10, so that the guide cam 73 is released via the cam guide 75 to such an extent that the switching element 60 is moved by the force of the clip spring 64 from the second position to the first position can be pivoted. An opening process can thus take place again immediately after the closed position has been reached. If it is desired that a renewed 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 that is to be awaited. However, such a time delay is only optional, since even after the movable furniture part has been pushed into the pushed-over position, immediate opening is possible 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 timers are, for example, suction cups with a small hole that loosen contact with a surface due to the inflow of air, or an elastomer with a slowed-down return movement. If an elastomer is used, the spring 64 for the restoring movement can be omitted since the elastomer itself can have a resilient effect.

In figure 14 a path-time diagram is shown in which a closing process is shown in which no overpressure position is reached. The moveable furniture part 3 is moved in the closing direction, and in the process the force accumulator on the carriage 30 is tensioned in a first section. After the energy accumulator is tensioned with the springs 22 and the ejection device 6 is latched to the latching receptacle via the pin 41, the automatic closing 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 area of the closing . The movable furniture part 3 then reaches the closed position and it there is no more movement until the user moves the movable furniture part 3 into the push-over position and thus unlocks the ejection device 6 .

In figure 15 It is shown that the closing process can also take place in an overpressure position, with the movable furniture part 3 being moved in the closing direction both in the clamping area and in the retraction area, specifically beyond the closed position into the overpressure position. The movable furniture part can be held in the overpressure position for any length of time until it is released by the user, in order then to be 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 ejection device 6 is shown in a position during the opening movement in which the driver 12 has already moved part of the way on the housing 10 in the opening direction and the carriage 30 is arranged on the housing 10 shortly before it reaches its end position. The first pin 41 moves straight against the run-up slope 45 on the guide track 17, so that the control element 40 not only moves with the carriage 30 in the opening direction, but also in 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 is shown in figure 17 is shown, the second pin 42 moves 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 at the further opening movement in figure 17 also proceed to the right. Here act on the control element 40 and the pins 41 and 42 frictional forces that slow down the movement of the driver 12 slightly. In this area, the carriage 30 is only slightly moved in the opening direction, but it can also be arranged stationary. The driver 12 moves further together with the movable furniture part 3 in the opening direction.

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

In order to brake the speed after the maximum speed of the movable furniture part has been reached, other dampers can also be provided as an alternative or in addition, for example air dampers, fluid dampers, linear dampers or rotary dampers. The damping force is preferably speed-dependent, ie the higher the speed of the movable furniture part at the end of the first distance, the higher the damping forces become in order to slow down the ejection speed more at higher speeds.

In figure 19 an ejection device 6 according to the invention is shown, which corresponds to the previous exemplary embodiment, the housing 10 being arranged on a holder 80 which can be fixed on the movable furniture part or a furniture body. Furthermore, an attachment 81 is provided on the housing 10, on which an electromechanical actuator 82 is held.

As in the views of Figures 20A and 20B is shown, the electromechanical actuator 82 has an outer sleeve 85 and an inner plunger 84 which can be moved in the axial direction, for example by means of an energizable lifting magnet or an electric motor. A connecting element 83 can be moved via the plunger 84 in order to move the actuating element 50 of the ejection device 6 . The movement of the actuating element 50 takes place against the force of the spring 68 to return the actuating element 50 to an initial position. As a result, the ejector 6 alternative to that in the Figures 6 to 13 described mechanical unlocking can also be unlocked via the electromechanical actuator 82.

The unlocking via the electromechanical actuator 82 is in the Figures 21 to 23 shown in detail. In figure 21 is the ejector in a closed position, and the control is with the pin 41 at a latching receptacle locked, which is formed by part 23 and part 51. The part 23 forms a guide surface which is oriented at an angle to the effective direction of the two springs 22 of the force accumulator, preferably at an angle of between 60° and 90°. The direction of action is in figure 21 top down. The pin 41 of the control element is held locked by the part 51 of the actuating element 50, the part 51 bearing against the pin 41 laterally. The energy accumulator with the springs 22 pulls the pin 41 of the control element figure 21 down, and the counteracting force of the locking receptacle is mainly generated by the guide surface on the part 23, while only a smaller force is applied to the part 51 for the lateral retention of the pin 41.

If the control element 40 is now to be unlocked, the electromechanical actuator 82 is supplied with power via a battery in order to actuate a lifting magnet, an electric motor or another drive in order to move the connecting element 83 and the actuating element 50, as is shown in figure 22 is shown. Moving the part 51 of the snap-in socket upwards requires only little force, since the pin 41 of the control element 40 is not moved against the force of the springs 22, but only the lateral locking of the snap-in socket moves through the part 51. As a result, the pin 41 can now be moved along the inclined guide surface of the part 23 into the loop-shaped guide track 17 . By moving the actuating element 50 upwards, the latching lug 54 was also moved over the latching projection 25, so that the actuating element 50 is now latched in an unlocking position.

As in figure 23 is shown, the pin 41 of the control element 40 now moves along the guide track 17 and can pivot the web 53 when it hits the run-up slope 57 and thereby unlocks the web 53 of the actuating element 50 . The actuating element 50 is then moved back into the starting position by the force of the spring 68 . The clamping of the ejector 6 takes place as in the Figures 10 to 13 is already described.

In the illustrated embodiment of the Figures 19 to 23 For example, the ejection device 6 can be unlocked either by pressing the drawer into an overpressure position and moving the control element with the pin 41 against the switching element 60, or by using the electromechanical actuator 82. It is of course also possible to omit the switching element 60 and unlock the ejection device 6 to be carried out only via the electromechanical actuator 82.

If the switching element 60 is removed and mechanical triggering is thus prevented, the electromechanical actuator can also fulfill other functions such as protection against leaning against it. This prevents, for example, the ejection device from being triggered if the movable furniture part is in an overpressure position for longer than a predetermined period of time. Collision protection or an opening lock can also be implemented. This prevents a movable furniture part from opening when another movable furniture part is already open.

The electromechanical actuator 82 may be connected to a sensor that detects grasping of a handle member or touch surface to effect an unlocking. Alternatively, the sensor can also detect forces, for example tensile forces when pulling on the drawer or compressive forces. In addition, a movement of the drawer or another sensor element can also be detected in order to initiate an unlocking process.

In a further embodiment, the drive device comprises two lockable ejection devices, which correspond to the Figures 19 to 23 are trained. These two ejection devices 6 can then be synchronized, ie when a locking receptacle on one ejection device is unlocked, the other ejection device is also unlocked, with the two electromechanical actuators communicating with one another via radio or cable in order to bring about such a triggering process essentially simultaneously. It is also possible for the two actuators 82 to be connected to one another via a sensor by radio or cable and thus to trigger them together.

Reference List

1

furniture

2

body

3

furniture part

4

front panel

5

drawer guide

6

ejection device

7

activator

8th

side frame

9

bracket

10

Housing

11

guide

12

driver

13

coupling element

14

lid

15

adjustment mechanism

16

guideway

17

guideway

18

guideway

19

rack

20

recording

21

bracket

22

Feather

23

Part

25

locking projection

26

actuator mount

27

end section

30

Sleds

31

spring mount

32

spring mount

33

recording

34

cornering

35

locking projection

36

gear

37

recording

38

Side wall

40

control

41

Pen

42

Pen

43

web

44

sliding element

45

leading edge

50

actuator

51

Part

52

warehouse

53

web

54

detent

55

section

56

web

57

leading edge

60

switching element

61

recess

62

Pressure piece

63

poor

64

bail 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

stock pick-up

75

cam guide

80

holder

81

essay

82

actuator

83

fastener

84

pestle

85

sleeve

Claims (10)

1. A drive device for a movable furniture part (3) having a lockable ejection device (6), by means of which the movable furniture part (3) is ejectable from a closed position by a force accumulator (22) in the opening direction, wherein the ejection device (6) comprises a control element (40), which can be coupled to the movable furniture part (3), and is held by the force accumulator (22) in a locked position of the ejection device (6) at a multipart catch receptacle, wherein the control element (40) comprises a pin (41), which is guided in a guide path (70) with the catch receptacle an electromechanical actuator (82), via which a part (51) of the catch receptacle is movable, is provided for unlocking of the ejection device (6), wherein the drive device comprises a self-retraction mechanism which moves the movable furniture part (3) into a closed position, whereby a damper is provided which brakes the closing movement of the movable furniture part (3).
2. The drive device according to Claim 1, characterized in that the catch receptacle comprises a second part (23) having a guide surface aligned at an angle in relation to the action direction of the force accumulator (22), by means of which the control element (40) is movable during an unlocking procedure to a guide path (17).
3. The drive device according to Claim 1 or 2, characterized in that the movable part (51) of the catch receptacle presses laterally against the control element (40) viewed in the action direction of the force accumulator (22).
4. The drive device according to any one of the preceding claims, characterized in that a positioning element (50) is provided, which forms a part (51) of the catch receptacle and is held so it is displaceable, pivotable, or rotatable on a housing (10) or a guide element.
5. The drive device according to Claim 4, characterized in that the positioning element (50) is pre-tensioned by a spring (68) in an end position on the housing (10) or the guide element.
6. The drive device according to any one of the preceding claims, characterized in that the control element (40) is also movable against the force of the force accumulator (22) in the closing direction, by the movable furniture part (3) being brought into an overpressing position, for unlocking of the ejection device (6).
7. The drive device according to any one of the preceding claims, characterized in that the electromechanical actuator (82) is supplied with current via a battery.
8. The drive device according to any one of the preceding claims, characterized in that at least one sensor is provided for triggering the electromechanical actuator (82).
9. The drive device according to any one of the preceding claims, characterized in that the electromechanical actuator (82) comprises a solenoid or an electric motor.
10. The drive device according to any one of the preceding claims, characterized in that the drive device comprises at least two ejection devices (6), the electromechanical actuators (82) of which can communicate via signals to simultaneously unlock the ejection devices (6).

Images