EP2148589B1 - Drive for a movable furniture part - Google Patents

Abstract

The invention relates to a movable furniture part, particularly a furniture drawer, comprising a ejector device having an ejector lever and an electric motor for driving the ejector lever, wherein a retracting device is provided with traction means (4) that can be wound onto a roll (8), wherein the roll (8) can be driven by an electric motor (6, 7), and the ejector device and retracting device are mechanically connected to one another such that they can be mounted as a unit in or on a furniture body.

Description

The present invention relates to a drive for a movable furniture part, in particular furniture drawer, with a discharge lever having a discharge device and an electric motor for driving the ejection lever. Such a drive is eg off AT 413 472 B known.

By such a drive, it is possible to eject the movable furniture part from its closed end position in or on a furniture body in an at least partially open position. However, it is not possible to move the movable furniture part against the opening direction, for example, to transfer it to the closed end position.

The object of the invention is to develop a generic drive such that its functionality is expanded, but the drive is not expensive to assemble.

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

The provision of a collection device allows the application of forces to the movable furniture part in the feed direction. As pulling means, for example, offers a cable. However, traction means with a certain rigidity (such as metal bands) may also be provided.

By mechanically connecting the ejection device and the retraction device to a structural unit, it is ensured that the drive with the combined functionalities is equally easy to assemble, as a drive according to the prior art, which has only one ejection device.

For example, it can be provided for this purpose that the ejection device and the feed device are arranged on a common mounting plate. However, an embodiment of the invention in which the ejection device and the feed device are arranged in a common housing is particularly preferred.

It when it is provided that the housing has a lockable by a lever bracket for tool-free attachment of the drive to a rail is particularly advantageous. This allows a particularly simple installation of the drive.

In principle, a drive according to the invention for the ejection device and the feed device can each provide its own electric motors.

In this case, it is advantageous if the ejection device and the retraction device each have their own transmission for transmitting power from the respective electric motor to the ejection lever or the roller, so that the drive train of the ejection device and that of the retraction device mechanically separated from each other.

In such a case, a coupling of the ejection device and the feed device can be effected by a common control unit in an electronic manner.

Alternatively it can be provided that the ejection lever of the ejection device and the role of the feed device can be driven by the same electric motor. This embodiment has the advantage that only a single electric motor per drive is necessary.

The switching of the power transmission from the electric motor to the ejection lever of the ejection device or to the role of the feed device can be done by a variety of couplings. However, particularly preferred is an embodiment in which the power transmission from the electric motor via a planetary gear is optionally on the ejection lever or the roller. Such a planetary gear is characterized by a particularly compact design, which is particularly important if the ejection device and the collection device are arranged in a common housing.

In this embodiment, it may be provided that the planetary gear is formed in two stages, wherein the one stage of the power transmission from the electric motor to the ejection lever and the other stage of power transmission from the electric motor the role serves. The selection of the respective stage can be carried out via a switchable by a control or regulating device brake, which may be formed for example as a magnetic brake.

Each of the two stages of the planetary gear may have its own ring gear, in which the respective planet gears are accommodated, wherein the brake of each stage cooperates with the respective ring gear. By determining the respective ring gear by the respective brake, there is a revolution of the planetary gears.
In one embodiment of the invention, it is provided that in the ejection unit associated stage, the power transmission takes place in orbiting planetary gears, however, in the role assigned to the stage, the power transmission takes place at fixed planetary gears. As a result, the mutually opposite directions of rotation of the ejection lever and the roller can be realized with the same direction of rotation of the electric motor.

For example, three planet gears may be provided for each stage.

The sun gear of the planetary gear is formed in each stage by a common axis, which is driven by the common electric motor.

As already stated, in each of the above-mentioned embodiments, a common control device may be provided for controlling the ejection device and the intake device.

This ejection device may have a touch-latch functionality in any embodiment of the drive. This means that the ejection device in the closed and / or the partially or fully open end position of the movable furniture part can be triggered by a force on the furniture part. The necessary training for the ejector was already in the Austrian patent AT 413 472 (See in particular page 4, paragraphs 3 to 7, page 7, paragraphs 4 and 5, page 8, paragraph 6 and the figures therein), so that a more detailed description can be omitted at this point.

Also, the collection device may be equipped with such a touch-latch functionality, so that the overall result is a drive with touch-latch functionality. For this purpose, it is necessary that the role in the winding direction is biased by a force storage, so that the traction means is constantly held under mechanical tension in intake device. In this way, a force can be transmitted to the movable furniture part by a user on the traction means on the role and be detected by suitable means (for example, rotary potentiometer).

Fig.1

eine perspektivische Ansicht eines Ausführungsbeispiels eines erfindungsgemäßen Antriebs mit gemeinsamen Gehäuse,

Fig. 2a, 2b

den Antriebstrang eines ersten Ausführungsbeispiels eines erfindungsgemäßen Antriebs in einer perspektivischen Ansicht und einer blockweisen Explosionsdarstellung,

Fig. 3a, 3b

eine Detailansicht zu den Figuren 2a, 2b in einer perspektivischen Ansicht und einer Explosionsdarstellung,

Fig. 4a bis 4e

den Antriebstrang eines zweiten Ausführungsbeispiels eines erfindungsgemäßen Antriebs in verschiedenen Ansichten bzw. Schnittdarstellungen und

Fig. 5a bis 5c

den in den Figuren 4a bis 4c dargestellten Antriebsstrang in weiteren Ansichten und einer Detailansicht.

Further advantages and details of the invention will become apparent from the figures and the associated description of the figures. Showing:

Fig.1

a perspective view of an embodiment of a drive according to the invention with common housing,

Fig. 2a, 2b

the drive train of a first embodiment of a drive according to the invention in a perspective view and a block-wise exploded view,

Fig. 3a, 3b

a detailed view of the FIGS. 2a, 2b in a perspective view and an exploded view,

Fig. 4a to 4e

the drive train of a second embodiment of a drive according to the invention in different views and sectional views and

Fig. 5a to 5c

in the FIGS. 4a to 4c illustrated drive train in other views and a detailed view.

Fig. 1 shows a perspective view of a drive 1 according to the invention, in which all components are arranged in a common housing 2 and stored in this. In particular, the ejection lever 3 of an ejection device and the traction means 4 of a feed device can be seen. About the provided with the numeral 5 lever mechanism, the drive 1 can be attached to a rail, not shown, in a furniture body without tools.

Fig. 2a shows in a perspective view of the drive train 6, 9, 3 of the ejector or the drive train 7, 10, 8 of the intake device for a first embodiment of a drive 1 according to the invention, in which

Ejection lever 3 of the ejection device and the roller 8 of the intake device can be driven by separate electric motors 6 and 7, respectively, and own transmission 9 or 10 are provided for transmitting power.

The drive train 6, 9, 3 of the ejection device has a transmission 9, by which the number of revolutions of the electric motor 6 (for example, about 6000 rpm) can be reduced via a series of gears. It can be seen further that the ejection lever 3 in a known manner (see, for example, Fig. 17 of the AT 413 472 B ) is provided with a toothing 12, with which an unillustrated rotary potentiometer combing to ensure a touch-latch functionality.

Also, the drive train 7, 10, 8 of the intake device has a transmission 10 for reducing (about 40: 1) the speed of the electric motor 7 (for example, about 12000 rpm) and is in the Fig. 3a and 3b shown in detail.

Fig. 2b shows that the drive trains 6, 9, 3 and 7, 10, 8 in the in Fig. 2a shown assembly position are mechanically separated from each other and were pushed as close as possible to each other only for reasons of space.

Fig. 3a shows the gear 10 together with the driven by the gear 10 roller 8 on which the traction means 4 is wound. The traction means 4 is guided over rollers 13 from the housing 2, not shown here, and is provided at its free end with a coupling part 48 for coupling to a corresponding coupling part, not shown, on the movable furniture part.

The electric motor 7 drives the gear 14 via its worm. This is rotatably connected via the axis 15 with the gear 16. The gear 16 meshes with the gear 17, which in turn meshes with the gear 18. The gear 18 is rotatably connected to a square portion 19, which serves to transmit power to the roller 8. In this case, a Ruschkupplung 20 to 23 is connected between the square portion 19 and the roller 8, which is described in detail in the Austrian patent application A 1769/2006. This is a wrap spring clutch, the outer shell 22 is slightly braked by the spring 23, resulting in an immediate switching of the clutch.

The roller 8 is biased by a force accumulator 24 in the winding.

With the roller 8 rotatably connected to a screw attachment 25 which meshes with the drive wheel 26 of a rotary potentiometer. The rotary potentiometer serves to determine the position of the roller 8 to realize a touch-latch functionality and the position as a movable furniture part.

In the FIGS. 4a to 4e the drive train of a second embodiment of a drive 1 according to the invention is shown, wherein a common electric motor 6 for the ejection lever 3 and the roller 8 is provided (see Fig. 5 ).

In this case, a planetary gear 11 is provided for the optional power transmission to the ejection lever 3 of the ejection device or the roller 8 of the feed device (see perspective view of Fig. 4a ). The structure of the planetary gear 11 is based on the Fig. 4b in conjunction with the Fig. 5a to 5c explained. The power flow through the planetary gear 11 is in the Fig. 4c to 4e shown schematically.

The planetary gear 11 has a first drive wheel 27, which can be driven via the gears 28 and 29 by the worm 30 of an electric motor 6 (see Fig. 5a ).

The drive wheel 27 is rotatably arranged on the axis 31, which acts as a sun gear of the planetary gear 11. On the same axis 31, a wheel 32 is arranged, which via pin 35 three planet wheels 34 (in Fig. 4b are only two planet gears 34 recognizable) carries. Between the wheel 32 and the gear 27, a square section 33 is integrally arranged with the wheel 32, on which the ejection lever 3 of the ejection device can be plugged for driving. Together with the one-sided toothed ring gear 36, the first stage of the planetary gear 11 is formed by the parts 32, 33, 34, 35 and 36 and the axis 31 as a sun gear.

Below the ring gear 36, a further ring gear 38 is arranged, which carries three planet gears 39 (only two are visible). The planet gears 39 mesh with the internal teeth of a wheel 40, which is integrally formed with the roller 8 and with the rotatably connected to the axis 31 gear 37. The wheel 40 points Furthermore, an outer toothing 41, which meshes via a gear 42 and a gear 43 with a rotary potentiometer, not shown (see Fig. 5a ).

The second stage of the planetary gear 11 is formed by the components 37, 38, 39 and 40 and the axis 31 as a sun gear.

The functionality of the planetary gear 11 is particularly with regard to the Fig. 4c to 4e explained. The better Erkensbarkeit sake were in the Figures 4d and 4e only in each case the relevant components provided with reference numerals.

Fig. 4d shows the power transmission from the electric motor 6 to the ejection lever 3 of the ejector. The force is applied via the drive wheel 27 on the axis 31. The first stage of the planetary gear 11 associated brake 44 (in Fig. 5a not recognizable, since it is located on the non-visible rear side) brakes via a wrap spring 45, the ring gear 36 of the first stage. This results in a circulation of the planetary gears 34 in the ring gear 36 under mesh with the internal teeth. By means of the bolts 35, the wheel 32 and the square section 33 arranged thereon are thereby rotated. This leads to a driving of the ejection lever 3 of the ejection device.

Meanwhile, the second stage brake 44 remains inactive. The ring gear 38 of the second stage can rotate freely together with the planetary gears 39 attached thereto and there is no transmission of power to the wheel 40 and the roller 8.

The situation is different in Fig. 4e , Here is the brake 44 (see Fig. 5a By the fixed ring gear 38, the planetary gears 39 remain stationary and mesh on the one hand with the gear 31 driven by the axis 31 and on the other hand with the internal toothing of the gear 40. As a result, the driving force from the gear 37 (sun gear) via the planet gears 39 to the gear 40 and thus transferred to the roller 8.

The first stage (power transmission to the ejection lever 3) thus has during the power transmission revolving planetary gears 34, whereby the planetary gears 34 via the bolts 35 bearing wheel 32 is set in motion.

In contrast, the second stage (for the roller 8) during power transmission fixed planetary gears 39, since the ring gear 38, on which the planet gears 39 are mounted, is fixed by the wrap spring 46. In this case, there is power transmission from the axis 31 and the gear 37 via the planetary gears 39 to the wheel 40. The direction of rotation is, however, reversed compared to the first stage. This is also to be demanded, since the drive direction for the ejection or the entry of a movable furniture part must be opposite to one another with the direction of rotation of the axle 31 unchanged.

Of interest is still the structure of the brake 44, which from the Fig. 5b and 5 c emerges. It can be seen that the brake 44 has a plunger 47 which, upon activation of the brake 44, presses on the associated wrap spring 45 or 46. In this embodiment, the brakes 44 are designed as magnetic brakes.

Claims (13)

1. A drive (1) for a movable furniture part, in particular a furniture drawer, comprising an ejection device having an ejection lever (3) and an electric motor (6, 7) for driving the ejection lever, characterised in that there is provided a retraction device having a pulling means (4) which can be wound on to a roller (8), wherein the roller (8) is drivable by an electric motor (6, 7), and the ejection device and the retraction device are mechanically connected in such a way that they can be mounted as a unit in or on a furniture body.
2. A drive as set forth in claim 1 characterised in that the ejection device and the retraction device are arranged in a common housing (2).
3. A drive as set forth in claim 2 characterised in that the housing (2) has a stirrup arrestable by a lever (5) for fastening the drive (1) to a profile bar without a tool.
4. A drive as set forth in one of claims 1 through 3 characterised in that respective dedicated electric motors (6, 7) are provided for the ejection device and the retraction device.
5. A drive as set forth in claim 4 characterised in that the ejection device and the retraction device have respective dedicated transmissions (9, 10) for the transmission of force from the respective electric motor (6, 7) to the ejection lever (3) and the roller (8) respectively.
6. A drive as set forth in one of claims 1 through 3 characterised in that the ejection lever (3) of the ejection device and the roller (8) of the retraction device are drivable by the same electric motor (6).
7. A drive as set forth in claim 6 characterised in that the transmission of force from the electric motor (6) is effected selectively to the ejection lever (3) or the roller (8) by way of a planetary transmission (11).
8. A drive as set forth in claim 7 characterised in that the planetary transmission (11) is of a two-stage nature, wherein the one stage serves for the transmission of force from the electric motor (6) to the ejection lever (3) and the other stage serves for the transmission of force from the electric motor (7) to the roller (8).
9. A drive as set forth in claim 8 characterised in that a brake (44) is provided for each of the two stages, upon the actuation of which brake the transmission of force is effected by way of the associated stage.
10. A drive as set forth in claim 8 or claim 9 characterised in that each of the two stages has its own ring gear (36, 38) in which the respective planetary gears (34, 39) are accommodated or mounted, wherein the brake (44) of each stage co-operates with the respective ring gear (36, 38).
11. A drive as set forth in claim 10 characterised in that in the stage associated with the ejection unit, the transmission of force is effected with the planetary gears (34) rotating whereas in the stage associated with the roller (8) the transmission of force occurs with the planetary gears (39) stationary.
12. A drive as set forth in one of claims 1 through 11 characterised in that there is provided a common control or regulating device for controlling or regulating the ejection device and the retraction device.
13. A drive as set forth in one of claims 1 through 12 characterised in that the roller (8) is biased in the winding-on direction by a force storage means (24).

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