WO2004101919A1

WO2004101919A1 - Item of furniture equipped with a movable furniture part that can be acted upon by an energy storing means

Info

Publication number: WO2004101919A1
Application number: PCT/AT2004/000155
Authority: WO
Inventors: Reinhard Mäser
Original assignee: Julius Blum Gmbh
Priority date: 2003-05-19
Filing date: 2004-05-06
Publication date: 2004-11-25
Also published as: ATA7652003A; AT413933B

Abstract

The invention relates to an item of furniture equipped with a moveable furniture part, particularly a drawer or doors, and with an energy storing means. Said moveable furniture part (2) can be acted upon by the energy storing means (4), and the energy storing means (4) can be loaded by a drive unit (3).

Description

FURNITURE WITH A MOBILE PART WHICH CAN BE MOVED ON BY A POWER STORAGE

The present invention relates to a piece of furniture with a movable furniture part, in particular a drawer or door, and an energy store.

In the prior art, such energy stores, which are usually designed as springs, are used to eject the movable furniture part from the closed end position in or on the furniture.

The problem with this, for example, is that the tensioning of the spring during the closing process takes place on a last section upstream of the closed end position of the movable furniture part. The energy required to tension the spring must be applied manually by the user. Inadequate application of force by the user can result in the energy store designed as a spring either being insufficiently charged or the spring releasing the energy applied by the user to the movable furniture part after half an oscillation, causing it to move from the closed end position into a partially open position End position is moved.

The object of the invention is to avoid known problems in the generic prior art.

This is achieved according to the invention in that the movable furniture part can be acted upon by the energy store and the energy store can be charged by a drive unit. It is particularly advantageous if the energy accumulator for ejecting the movable furniture part is discharged from its closed end position in or on the furniture on the movable furniture part.

By charging the energy accumulator via a drive unit, on the one hand, the energy accumulator is charged up to the desired degree.

On the other hand, the energy accumulator can be charged by the drive unit a short time after the movable furniture part has been ejected, that is to say even before the closing process of the movable furniture part is initiated. The energy accumulator can be charged by the drive unit independently of the movable furniture part. This prevents the movable furniture part from having to overcome a counterforce exerted by the energy store in the last section in front of the furniture body during the closing process.

Preferably, the movable furniture part is ejected by an ejector, for example designed as a plunger, which can be acted upon by the energy accumulator and can preferably be locked in at least one position. To prevent disturbing noise, the ejector can have a damper at the contact point for the movable furniture part. For example, in the embodiment of the ejector as a tappet, this could be a rubber hood covering the free tappet end.

For storing and guiding the ejector, it can be provided that it is slidably arranged in a sleeve.

The ejection process can be triggered by a sensor, the signals of which can be fed at least to the drive unit. The drive unit can be electric and can comprise, for example, an electric motor and any control device. The sensors can be designed as optical sensors. Other non-contact sensor types, such as capacitive or inductive sensors, would also be conceivable. However, the arrangement of contact sensors, such as pressure switches, can also be provided. In any case, no push buttons or the like to be operated by the user are required.

Fluid pressure accumulators, for example, are suitable as energy accumulators. This can be a piston which is movably arranged in a cylinder and which defines a variable volume in the piston which is filled with a compressible fluid.

An energy store comprising at least one magnet would also be conceivable. This can be a system of two magnets arranged with their poles of the same name, the relative distance between the magnets being reduced to charge the energy accumulator. However, it would also be conceivable for a force accumulator to be formed from a separately movably mounted body made of conductive material and from an electromagnet, the electromagnet being supplied with current for triggering the ejection process, which leads to generation of an induction current pushing the body away from the magnet in the body from conductive material. In a further embodiment of the invention it is provided that the energy store comprises at least one mass with changeable potential energy. This can be, for example, a mass that is moved alternately between two different altitudes in the earth's gravitational field. In this case, the discharge of the energy accumulator corresponds to the movement of the mass from the higher position to the lower position, as a result of which the potential energy of the mass in the gravitational field of the earth is reduced and converted into kinetic energy of the movable furniture part.

In a particularly preferred embodiment of the invention it is provided that the energy accumulator comprises at least one spring, which can preferably be a helical spring. In this case, the charged energy accumulator corresponds to the tensioned spring, while the discharge of the energy accumulator corresponds to the relaxation of the spring. A tensioned spring is understood to mean a compressed as well as an expanded spring.

Particularly if the energy store is to be charged by the drive unit a short time after the ejection process has ended, it can advantageously be provided that the furniture has a device, preferably a crank, which can be driven by the drive unit and which is in a first and in a second position with the Ejector is contactable. The device retains the ejector in its first position against exposure to the charged energy accumulator. By moving the device away from its first position, the ejector is released, whereby the energy accumulator can be discharged and the ejector accelerates the movable furniture part. In its second position, the device contacts the ejector again in order to return it to the starting position against the action of the energy accumulator. Since the drive unit must work against the force accumulator being loaded, the force accumulator is recharged.

It is particularly advantageous if it is provided that the energy store can also be charged manually, for example by moving the movable furniture part. This allows operation when the drive unit fails.

In a further advantageous embodiment of the invention it is provided that the furniture has a mechanical switch for manually triggering the discharge of the energy store. This is an alternative to triggering the ejection process using a sensor. In a further advantageous embodiment of the invention, it is provided that the furniture has a mechanical lock for the energy store for manual locking of the energy store in the charged state. In conjunction with the manual triggering using the mechanical switch described above, this enables purely manual operation. This is particularly advantageous in the event of a failure of the drive unit, which can be attributed to a power failure in an electric drive unit, for example.

In a further advantageous embodiment of the invention, it is provided that the energy store is supported on a movably mounted abutment. It is particularly advantageous if the abutment can be moved by the drive unit. It can then be provided that the energy store can be charged by moving the abutment. This takes place in an embodiment that is particularly simple to construct with an ejector locked (in relation to the furniture body).

Furthermore, it can be provided that the ejector can be moved by moving the abutment. As a result, the ejector can be pulled back into its initial position in the furniture body after the ejection process has been completed.

For example, the ejector can be arranged displaceably in a sleeve together with a spring and a movable abutment for the spring. The spring is located between the ejector and the abutment. To tension the spring, the abutment is moved towards the ejector when the ejector is locked, as a result of which the spring is compressed. If the ejector is unlocked, the spring relaxes and thereby accelerates the ejector to eject the movable furniture part. After the ejection process is complete, the ejector can be pulled back together with the spring through the abutment into the sleeve. To restore the initial state, the ejector is locked and the spring is compressed by moving the abutment.

A piece of furniture according to the invention with a manual emergency function can be implemented particularly easily in a first exemplary embodiment if it is provided that the ejector for the movable furniture part is arranged displaceably in a sleeve. The sleeve acts as a guide for the ejector. It is preferably provided that the energy accumulator comprises a spring, preferably a coil spring, arranged in the sleeve. Such a spring can be easily charged manually. The spring can be arranged between the ejector and an abutment movable by the drive unit. For example, it can be provided that a threaded rod that can be driven by the drive unit is arranged in the sleeve. When the drive unit is working, the spring can be charged via the threaded rod. For example, it can be provided for this that the abutment for the spring comprises a nut arranged on the threaded rod.

It is particularly advantageous if the mechanical switch and the mechanical locking device are designed together as a touch-latch device. This is also advantageous when the drive unit is functioning, since both the mechanical switch and the mechanical interlock are implemented in a single component.

The invention further relates to a method for ejecting a movable furniture part, in particular a drawer or door from a closed end position in or on a piece of furniture, which has a drive unit and an energy store, the energy store for ejecting the movable furniture part to a predetermined or predetermined degree , but is preferably completely discharged on the movable furniture part and the energy store is charged, preferably completely, after the movable furniture part has been ejected by the drive unit.

The piece of furniture preferably has an ejector, preferably a ram, which can be moved between two positions and acted on by the energy accumulator, and a device, preferably a crank, which can be driven by the drive unit, the device emitting the ejector prior to initiating the ejection process of the movable furniture part against the action of the energy accumulator in the holds back the first position, the device releases the ejector for initiating the ejection process of the movable furniture part and, after the ejection process has ended, returns the ejector from the second position against the action of the energy accumulator in the first position.

In the embodiment of the device which can be driven by the drive unit as a crank, it is advantageously provided that the crank makes a full revolution from the first position being released until the ejector is released until the ejector is returned to its first position. Furthermore, it can be provided that the crank executes half a turn from the first position until the ejector is released until the ejector is contacted again in its second position. When the energy accumulator is designed as a spring, it is tensioned in the charged state of the energy accumulator, that is to say it is either compressed or expanded. The spring relaxes during the ejection process, as a result of which the energy stored in the spring is converted into kinetic energy of the movable furniture part via the ejector. The spring is preferably tensioned again just a short time after the movable furniture part has been ejected.

When the energy accumulator is designed as a fluid pressure accumulator, the fluid is compressed in the charged state of the energy accumulator. During the discharge of the energy accumulator, the partial or complete expansion of the fluid is permitted, as a result of which the movable piston of the fluid pressure accumulator is moved outwards. As a result, the internal energy of the gas is converted into kinetic energy of the movable furniture part. To charge the energy accumulator, the fluid is compressed again by moving the piston in and the resulting volume reduction. Of course, a fluid force accumulator would also be conceivable, in which the fluid is expanded in the charged state of the energy accumulator to generate a negative pressure in the fluid volume. After the piston is released, the resulting suction effect unloads the energy accumulator, which can be converted into an ejection movement of the movable furniture part by suitable mechanical measures.

When the energy store is designed as a mass with changeable potential energy, the mass in the charged state of the energy store has a first value of potential energy, which is reduced to a lower second value during the ejection process. To charge the energy store, the potential energy of the mass is brought back to its first higher value by the drive unit. Mechanically, this can be any device in which a mass is arranged in the gravitational field of the earth with an adjustable altitude.

In each of the methods according to the invention it can be provided that the discharge of the energy store on the movable furniture part is sufficient to push the movable furniture part from the closed end position into the fully open end position. Alternatively, the movable furniture part is moved out of its closed end position only so far that a user can manually intervene in the gap formed in this way and the movable furniture part can be opened further manually. An exemplary embodiment of the invention is described below using the figures in the accompanying drawings. Show it:

Fig. 1 is a perspective view of an inventive

Ejector

Fig. 2 is a sectional view through the one shown in Fig. 1

Ejection device in a first state,

3 shows the ejection device shown in FIG. 2 in a second state,

4a, 4b sectional views of a further embodiment of the

Invention in a first and a second state,

5a, 5b are sectional views of a further embodiment of the

Invention in a first and a second state,

6a, 6b sectional views of a further embodiment of the

Invention in a first and a second state,

Fig. 7 is a sectional view of another embodiment of the

Invention,

8a-8d the sectional view of a further embodiment of the

Invention and

9a-9j in a schematic perspective or lateral representation a detail of the embodiment shown in FIGS. 8a-d.

FIG. 1 shows a perspective view of a device according to the invention arranged in a piece of furniture 1, which in this exemplary embodiment is composed of an ejector denoted by 5 and a device denoted by 11 for releasing and retrieving the ejector 5, which can be driven via a drive unit 3. In this exemplary embodiment, the ejector 5 comprises a piston-shaped base body with a plunger arranged thereon. The drive unit 3 is activated via lines (not shown) by the sensor 6, which in this exemplary embodiment is an optical sensor.

An ejection process according to the invention is explained below with reference to FIGS. 2 and 3 using the exemplary embodiment shown there.

FIG. 2 shows a section of the device shown in FIG. 1, the inner structure of the energy accumulator 4 now being recognizable. In this exemplary embodiment, this is formed by a spring 10, which is the piston-shaped one guided in a sleeve 15 Base body of the ejector 5 acted upon. The sleeve 15 has a further sleeve 16, which is arranged centrally in its interior and serves to guide the spring 10. In the illustrated state, the spring 10 is tensioned and acts on the ejector 5, which is held back by the device 11 (crank). The movable furniture part 2 is not subjected to a force.

Due to a force exerted by the user on the movable furniture part 2, the latter moves a short distance away from the furniture body, which is registered by the sensor 6 and reported to the drive unit 3 via lines (not shown). This then triggers an electric motor, not shown, which moves the device 11, which is designed as a crank in this exemplary embodiment, out of its first position shown in FIG. 2, as a result of which the ejector 5 is released and the spring 10 can relax. This thereby accelerates the piston of the ejector 5 guided in the sleeve 15, which gives the movable furniture part 2 a push via the plunger. In this exemplary embodiment, the translatory movement of the piston is limited by a flange 14 arranged on the inner sleeve 16 and corresponding stops 13 arranged in the sleeve 15. After the ejection process has ended, the piston of the ejector 5 is in the position shown in FIG.

In FIG. 3, the device 11 designed as a crank has made approximately half a revolution and now takes the piston of the ejector 5 and thus the tappet arranged on it back into the first position shown in FIG. 2 on its subsequent half revolution. The spring 10 is tensioned again, so that the overall state shown in FIG. 2 again results.

FIGS. 4a and 4b show a further exemplary embodiment of a device according to the invention, in which the energy accumulator 4 is designed in the form of a fluid pressure accumulator 7, which in this exemplary embodiment comprises a plunger 17 formed in the sleeve 15, which together with the piston of the ejector 5 is a variable one , Volume 19 filled with a compressible fluid (here: gas). A seal 19 sealing the fluid-filled volume 19, for example a rubber ring, can also be seen.

In FIG. 4 a, the ejector 5 is held in its charged position by the device 11 against the action of the compressed fluid in the volume 19.

FIG. 4b shows the state after the ejector 5 has been triggered, just before the device 11, and thus the piston of the ejector 5, on its last half revolution returns the plunger arranged on it to the first position shown in FIG. 4a. In the unloaded state shown in FIG. 4b, the volume 19 enlarged compared to FIG. 4a can be clearly seen.

FIGS. 5a and 5b show a further exemplary embodiment of a device according to the invention, in which the energy store 4 comprises two magnets 8 arranged at a variable distance from one another. The magnets 8 are arranged with their poles of the same name to one another. One magnet 8 is attached to the back of the sleeve 15, while the other magnet 8 is connected to the piston of the ejector 5.

In the charged state of the energy accumulator 4 shown in FIG. 5a, the relative distance between the two magnets 8 is smaller than in the discharged state of the energy accumulator 4 shown in FIG. 5b.

FIGS. 6a and 6b show a further exemplary embodiment of a device according to the invention, in which the energy accumulator 4 comprises a height-adjustable mass 9 which is connected to the device according to the invention via rods 20, 21. One rod 20 is articulated on the sleeve 15, while the other rod 21 is articulated to the piston of the ejector 5.

In the charged state of the energy accumulator 4 shown in FIG. 6a, the mass 9 is at a greater height than in the discharged state of the energy accumulator 4 shown in FIG. 6b. During the downward movement, the mass 9 pushes the piston of the ejector 5 outwards, while in the Movement of the piston by the device 11 is lifted back to its initial height.

FIG. 7 shows a further exemplary embodiment in which the energy accumulator 4 comprises a spring 10 as in FIGS. 1 to 3. The exemplary embodiment according to FIG. 7 differs from the exemplary embodiment illustrated in FIGS. 1 to 3 in that the tappet of the ejector 5 comprises a damping device 22 (here: fluid damper). As a result, the closing movement of the movable furniture part 2 can be damped. The arrangement of a damping device 22 is of course possible regardless of the type of energy storage 4.

The triggering of the ejection function can take place in the handle-free version of the movable furniture part 2, for example, by always in its closed end position still some play for manual movement of the movable furniture part 2 against the intended ejection direction remains. The manually caused movement of the movable furniture part 2 can be detected by the sensor 6 in a manner familiar to the person skilled in the art, depending on the type of sensor, and this detection signal can be fed to the drive unit 3, whereupon the drive unit 3 releases the ejector 5 via the device 11. In this embodiment, the user only has to exert pressure on the front of the movable furniture part 2 in its closed end position to trigger the ejection process of the movable furniture part 2 in order to activate the drive unit 3 and consequently to eject the movable furniture part 2 to cause.

When used to eject a drawer, the ejector 5 according to the invention can of course also be arranged on the rear of the furniture 1 and act on the rear of the drawer.

8a shows a sectional view through a piece of furniture 1 according to the invention, the movable furniture part 2 being designed as a furniture door. One can see an ejector mounted on the furniture body via the holder 27 with an ejector 5 having a damper 22. The ejector 5 can be subjected to a force by a spring 10. The ejector 5 and the spring 0 are arranged in a sleeve 23. The spring 10 is pushed between the ejector 5 and an abutment via a guide tube 28. The abutment comprises a nut 25 arranged on a threaded rod 24 so that it cannot rotate. The threaded rod 24 can be driven by the drive unit 3, which is designed, for example, as an electric motor. The spring 10, the nut 25 and the guide tube 28 are arranged in an inner sleeve 33. The inner sleeve 33 is delimited on one side by the ejector 5 arranged on it and on the other side by a stop 31 for the nut 25.

In the state shown in Fig. 8a, the spring 10 is tensioned, the energy accumulator 4 is thus in the charged state. The ejector 5 is locked by the touch latch device 26, with enough play remaining for the unlocking, of course. In the state shown in FIG. 8 a, the movable furniture part 2 has already been pressed somewhat in the direction of the furniture body by a user, which causes the touch-latch device 26 to be unlocked and thus releases the ejector 5 and thus the spring 10. 8b, the spring 10 has already relaxed, as a result of which the ejector 5 has ejected the movable furniture part 2 from its closed end position. The movement of the ejector 5 out of the sleeve 23 is limited by the stop 31 of the inner sleeve 33 as soon as the stop 31 hits the fixed nut 25. In Fig. 8c the movable furniture part 2 has detached from the ejector 5 or the movable furniture part 2 has been lifted from the ejector 5 by a user. The threaded rod 24 is now set in rotation by the drive unit 3, as a result of which the nut 25, which is arranged such that it cannot rotate, is moved in the direction of the drive unit 3. It takes the inner sleeve 33 and the ejector 5 arranged thereon via the stop 31.

In FIG. 8d, the ejector 5 has been withdrawn via the nut 25 into the starting position shown in FIG. 8a and locked in this position by the touch-latch device 26. However, the spring 10 is in the relaxed, that is to say uncharged, state. A renewed rotation of the threaded rod 24 by the drive unit 3 now moves the nut 25 in the direction of the ejector 5, as a result of which the spring 10 is tensioned. The entire device is then ready for ejection again.

If the drive unit 3 fails, the ejection device in this state can also be operated purely manually (manual emergency function).

9, the touch-latch device 26 is shown schematically. In this exemplary embodiment, it is formed by a groove 29 arranged on the inner sleeve 33, into which a pin 32 arranged on a spring tongue 30 can be inserted.

In the state shown in FIGS. 9a and 9b, the movable furniture part 2, not shown, and thus - as soon as the ejector 5 comes into contact with the movable furniture part 2 - the inner sleeve 33 is moved in the closing direction. As a result, the pin 32 arranged on the spring tongue 30 moves via the intermediate position shown in FIGS. 9c and 9d into the locking position, which is shown in FIGS. 9e and 9f. In this state, the inner sleeve 33 and thus also the ejector 5 are fixed. By pressing the movable furniture part 2 again in the direction of the furniture body, the unlocking of the touch-latch device 26 takes place and the pin 32 arranged on the spring tongue 30 moves to the intermediate position shown in FIGS. 9g and 9h in FIG 9e and 9j position and further into the rectilinear region 34 of the groove 29, whereby the ejector 5 is completely unlocked.

Claims

claims:

1. Furniture with a movable furniture part, in particular drawer or door, and an energy store, characterized in that the movable furniture part (2) can be acted upon by the energy store (4) and the energy store (4) can be charged by a drive unit (3).

2. Furniture according to claim 1, characterized in that the energy store (4) for ejecting the movable furniture part (2) from its closed end position in or on the furniture (1) on the movable furniture part (2) discharges.

3. Furniture according to claim 1 or 2, characterized in that the energy store (4) independently of the movable furniture part (2) by the drive unit (3) can be charged.

4. Furniture according to one of claims 1 to 3, characterized in that the furniture (1) has an ejector (5), preferably plunger, for the movable furniture part (2) which can be acted upon by the energy accumulator (4).

5. Furniture according to claim 4, characterized in that the ejector (5) can be locked in at least one position.

6. Furniture according to one of claims 1 to 5, characterized in that the furniture (1) has a sensor (6), preferably an optical sensor, the signals of which can be fed at least to the drive unit (3).

7. Furniture according to one of claims 1 to 6, characterized in that the drive unit (3) comprises an electric motor.

8. Furniture according to one of claims 1 to 7, characterized in that the energy accumulator (4) comprises a fluid pressure accumulator (7).

9. Furniture according to one of claims 1 to 7, characterized in that the energy store (4) comprises at least one magnet (8).

10. Furniture according to one of claims 1 to 7, characterized in that the energy store (4) comprises at least one mass (9) with variable potential energy.

11. Furniture according to one of claims 1 to 7, characterized in that the energy store (4) comprises at least one spring (10), preferably helical spring.

12. Furniture according to one of claims 4 to 11, characterized in that the furniture (1) from the drive unit (3) drivable device (11), preferably crank, which in a first and in a second position with the ejector (5) can be contacted.

13. Furniture according to one of claims 4 to 12, characterized in that the ejector (5) comprises a damping device (22).

14. Furniture according to one of claims 1 to 13, characterized in that the energy store (4) manually - preferably by moving the movable furniture part (2) - can be charged.

15. Furniture according to one of claims 1 to 14, characterized in that the furniture (1) has a mechanical switch for manually triggering the discharge of the energy store (4).

16. Furniture according to one of claims 1 to 15, characterized in that the furniture (1) has a mechanical lock for the energy store (4) for manual locking of the energy store (4) in the charged state.

17. Furniture according to one of claims 1 to 16, characterized in that the energy accumulator (4) is supported on a movably mounted abutment.

18. Furniture according to claim 17, characterized in that the abutment is movable by the drive unit (3).

19. Furniture according to claim 17 or 18, characterized in that the energy accumulator (4) when the ejector (5) is locked can be charged by moving the abutment.

20. Furniture according to one of claims 17 to 19, characterized in that the ejector (5) is movable by moving the abutment.

21. Furniture according to one of claims 1 to 20, characterized in that the ejector (5) is arranged displaceably in a sleeve (23).

22. Furniture according to claim 21, characterized in that the energy store (4) comprises a spring (10), preferably a helical spring, arranged in the sleeve (23).

23. Furniture according to claim 21 or 22, characterized in that a threaded rod (24) which can be driven by the drive unit (3) is arranged in the sleeve (23).

24. Furniture according to one of claims 17 to 23, characterized in that the abutment for the energy store (4) comprises a nut (25).

25. Furniture according to claim 24, characterized in that the nut (25) is arranged on the threaded rod (24).

26. Furniture according to one of claims 1 to 25, characterized in that the mechanical switch and the mechanical lock are designed together as a touch-latch device (26).

27. A method for ejecting a movable furniture part, in particular a drawer or door, from a closed end position in or on a piece of furniture which has a drive unit and an energy store, in particular according to one of claims 1 to 26, characterized in that the energy store for ejecting the movable furniture part (2) is discharged to a predetermined or predetermined degree, preferably completely, on the movable furniture part (2) and the energy store (4) after the movable furniture part (2) has been ejected from the drive unit (3), preferably completely, is charged.

28. The method according to claim 27, characterized in that the energy store (4) is charged independently of the movable furniture part (2) by the drive unit (3).

29. The method according to claim 27 or 28, characterized in that the piece of furniture (1) can be acted upon by the energy store (4) and can be moved between two positions Ejector (5), preferably plunger, and a device (11), preferably crank, which can be driven by the drive unit (3), the device (11) removing the ejector (5) before initiating the ejection process of the movable furniture part (2) Actuation of the energy accumulator (4) holds back in the first position, the device (11) releases the ejector (5) for initiating the ejection process of the movable furniture part (2) and, after the ejection process has ended, the ejector (5) from the second position against the Loads the energy accumulator (4) in the first position.

30. The method according to claim 29, characterized in that the device (11) is a crank which, from the release of the ejector (5) from its first position to the return of the ejector (5) in its first position, makes a full rotation.

31. The method according to any one of claims 27 to 30, characterized in that the device (11) is a crank which from release of the ejector (5) from its first position to contacting the ejector (5) in its second position by half Revolution.

32. The method according to any one of claims 27 to 31, characterized in that the energy store (4) is a spring (10) which is tensioned in the charged state of the energy store (4), is relaxed during the ejection process and after the ejection of the movable Furniture part (2) is tensioned again.

33. The method according to any one of claims 27 to 31, characterized in that the energy accumulator (4) is a fluid pressure accumulator (7), in which the fluid is compressed in the charged state of the energy accumulator (4), is expanded during the ejection process and after ejection of the movable furniture part (2) is compressed again.

34. The method according to any one of claims 27 to 31, characterized in that the energy store (4) comprises at least one mass (9) with variable potential energy, the mass (9) in the charged state of the energy store (4) to a first value has potential energy, the potential energy is reduced to a second value during the ejection process and is brought back to its first value after the ejection of the movable furniture part (2).

5. The method according to any one of claims 27 to 34, characterized in that the force exerted by the energy store (4) on the movable furniture part (2) leads to the movement of the movable furniture part (2) in its fully open end position.