WO2015070264A1

WO2015070264A1 - Furniture drive

Info

Publication number: WO2015070264A1
Application number: PCT/AT2014/000175
Authority: WO
Inventors: Gerald SPERGER
Original assignee: Julius Blum Gmbh
Priority date: 2013-11-14
Filing date: 2014-09-29
Publication date: 2015-05-21
Also published as: AT514944B1; EP3068266B1; JP6258489B2; AT514944A4; CN105744858A; JP2016537535A; ES2650550T3; CN105744858B; EP3068266A1

Abstract

The invention relates to a furniture drive (4) for ejecting a movable furniture part (3) from a closed end position in relation to a furniture body (2), comprising: a housing (9); an electrical drive unit (10) arranged in or on the housing (9); an ejecting lever (12), which can be driven by the electrical drive unit (10) and which is supported in such a way that the ejecting lever can be rotated about a pivot axis (11) in relation to the housing (9); a tappet (6) for ejecting the movable furniture part (3), which tappet can be driven by the ejecting lever (12) and can be moved linearly; wherein the furniture drive (4) has a reduction mechanism (5), which converts a pivoting motion of the ejecting lever (12) into a linear motion of the tappet (6), wherein the reduction mechanism (5) has at least one angle lever (15), which is rotatably supported about an axis of rotation (16) and which has two lever arms (18, 19), wherein a first lever arm (18) of the angle lever (15) interacts with the ejecting lever (12) and a second lever arm (19) of the angle lever (15) interacts with the linearly movable tappet (6) and wherein the axis of rotation (16) of the angle lever (15) and the pivot axis (11) of the ejecting lever (12) are arranged so as to be stationary in relation to each other.

Description

furniture drive

The present invention relates to a furniture drive for ejecting a movable furniture part from a closed end position relative to a furniture body, comprising:

a housing;

- An arranged in or on the housing electric drive unit;

- A driven by the electric drive unit ejection lever, which is rotatably mounted about a pivot axis relative to the housing;

- A driven by the ejection lever, linearly movable plunger for ejecting the movable furniture part.

Furthermore, the invention relates to a piece of furniture with a movable furniture part and with a furniture drive of the kind to be described.

General furniture drives for ejecting movably mounted furniture parts are described, for example, in WO 2004/101919 A1, in EP 2 380 459 A1 and in WO 201 1/130758 A1. In AT 504 838 B1, a furniture drive with a motor-driven ejection lever has become known, which rests loosely in the closed end position of the movable furniture part on a stop of a plunger. The plunger forms part of a power transmission device, wherein the force exerted during the ejection process can be transmitted to the movable furniture part via the intermediate space formed between the ejection lever and the movable furniture part via the plunger. In this way, movable furniture parts from the closed end position are ejected, which protrude only to a very small extent or not at all in the furniture body (furniture doors, furniture flaps or drawers whose depth is much smaller than the depth of the furniture body).

Object of the present invention is to provide a furniture drive of the type mentioned above with a simplified and more compact design. This is achieved by the features of claim 1. Further embodiments of the invention are specified in the dependent subclaims.

According to the invention, it is thus provided that the furniture drive has a reduction mechanism, which converts a pivoting movement of the ejection lever into a linear movement of the plunger, wherein the reduction mechanism has at least one angular lever rotatably mounted about an axis of rotation with two lever arms, wherein a first lever arm of the angle lever with the Ejection lever and a second lever arm of the angle lever cooperates with the linearly movable plunger and wherein the axis of rotation of the angle lever and the pivot axis of the ejection lever are arranged stationary relative to each other.

Due to the provided reduction mechanism with the angle lever two functions can be simultaneously enabled. On the one hand, the reduction ratio can be variably adjusted by the respective choice of the geometry of the angle lever, on the other hand can be brought about the angle lever a force diversion, so that an angular ejection of the plunger relative to the (main) ejection direction of the ejection lever is possible. In this way, the furniture drive can be formed with a more compact design.

Due to the arrangement of a pivotally mounted angle lever, at the first lever arm of the ejection lever rests or rolling (for example, arranged on a discharge lever pressure roller), can be caused by the respective size and contour of the angle lever and an extension of the pressure path in non-linear translation. The angle lever and / or the ejection lever may have at least one convexly curved portion for mutual engagement.

By the angle lever, it is possible that when ejecting the movable furniture part from the closed end position (ie when the electric drive unit only slowly anfährt) there is a high power transmission at low Wegübersetzung. Thus, when starting from the closed end position, a particularly large torque is available, so that even heavily loaded drawers, flaps or Doors can be easily ejected from the closed end position. The gear ratio can then be reduced starting from the closed end position of the movable furniture part over a predetermined rotation angle range of the ejection lever, so that the power transmission is reduced and the path ratio is increased.

The two lever arms of the angle lever enclose an acute angle relative to one another, wherein it is preferably provided that the angle which the two lever arms enclose relative to one another is constant in all operating positions of the angle lever. In a structurally simple embodiment can be provided that the first and the second lever arm of the angle lever are formed together in one piece.

Alternatively, it is possible that the angle which the first lever arm and the second lever arm of the angle lever include relative to each other, by an adjusting device - preferably continuously - is adjustable. In this way, for example by a fitter on site, a selective adjustment of the position of the plunger can be brought about. In operation, however, the included angle between the two lever arms of the angle lever is fixed, so as to transmit the required force to the movable furniture part.

Further details and advantages of the present invention will become apparent from the embodiment shown in the figures. 1 shows a piece of furniture with a furniture body and a furniture part movably mounted relative thereto in a perspective view, FIGS. 2a, 2b show the furniture drive according to FIG. 1 in two different perspective views

views

Fig. 3 of the furniture drive in an exploded view, and

Fig. 4a-4d temporal sequences of the ejection process of the plunger, starting from the closed end position in perspective views. Fig. 1 shows a furniture 1 with a furniture body 2 and a movable relative to this furniture part 3 in a perspective view. In the illustrated embodiment, the movable furniture part 3 is formed as a door which is pivotally mounted about a perpendicular axis relative to the furniture body 2. On the cabinet cover 7 of the furniture body 2, a furniture drive 4 is arranged with a pivotally mounted ejection lever 12, wherein the movable furniture part 3 is ejected via a linearly movable plunger 6 from the closed end position into an open position. For this purpose, the movable furniture part 3 projects beyond the cabinet cover 7 of the furniture body 2, so that the rear side of the movable furniture part 3 forms a stop surface for the extendable plunger 6.

Fig. 2a shows a view of the arranged on the furniture body 2 furniture drive 4 of FIG. 1 in an enlarged view. The furniture drive 4 is mounted on a base plate 8 to be fastened to the furniture body 2 and comprises a housing 9 in which an electric drive unit 10 with a gear for electromotive driving of the ejection lever 12 is arranged. The ejection lever 12 is rotatably mounted relative to the housing 9 about a, preferably in mounting position perpendicular, pivot axis 1 1. The triggering of the electric drive unit 10 can be done by sensors that detect a manually generated by a user (closing) movement of the movable furniture part 3. A simple releasability of the furniture drive 4 is given by a touch-latch functionality. For this purpose, it may be provided that a sensor, preferably a rotary potentiometer, is provided for detecting the angular position of the ejection lever 12, wherein the signals of the sensor of a control or regulating unit of the furniture drive 4 can be supplied and wherein the electric drive unit 10 of this control or regulating unit Is controllable or controllable. The ejection lever 12 has a disposed between the pivot axis 1 1 and the free end of the lever 13 of the ejection lever 12 ejection surface 14, which cooperates with a first lever arm 18 of an angle lever 15. The angle lever 15 has a second lever arm 19 which cooperates with the linearly movable plunger 6 via a - preferably curved - push lever 20 (FIG. 2 b). The angle lever 15 is mounted about an axis of rotation 16 which is arranged stationary with respect to the pivot axis 1 1 of the ejection lever 12. The angle lever 15 forms part of a reduction mechanism 5, which converts a pivoting movement of the ejection lever 12 into a linear movement of the plunger 6.

Fig. 2b shows the furniture drive 4 in a further perspective view. The ejection lever 12 has a disposed between the rotation axis 1 1 and the free end of the lever 13 ejection surface 14, which cooperates with the first lever arm 18 of the angle lever 15. The first lever arm 18 and the second lever arm 19 of the angle lever 15 include an acute angle relative to each other. The angle lever 15 is pivotally mounted on a pivot bearing 21 about a rotation axis 16, wherein the rotation axis 16 is arranged parallel and fixed with respect to the pivot axis 1 1 of the ejection lever 12. The position of the ejection lever 12 according to FIG. 2b corresponds to the closed position of the movable furniture part 3, whereby the angle lever 15 rests loosely with the first lever arm 18 on a region of the ejection surface 14 of the ejection lever 12 adjacent to the axis of rotation 1 1. That area at which the ejection lever 12 and the first lever arm 18 abut each other, emits the ejection of the movable furniture part 3 from the vicinity of the pivot axis 1 1 of the ejection lever 12 toward the free lever end 13 of the ejection lever 12, wherein a substantially uniform Change of the power arm takes place. One end of the second lever arm 19 is pivotally connected to the curved thrust lever 20, wherein the thrust lever 20 drives the plunger 6 via a slide 22 movably mounted. The plunger 6 is mounted linearly displaceable in the direction of the indicated arrow 32 relative to a guide element 17 fastened to the base plate 8. Fig. 3 shows the furniture drive 4 in an exploded view. On the base plate 8, a guide device 23 for guiding the slider 22 is to be fastened. On the slider 22, a holder 24 for receiving a damping device 25 is mounted, by which a closing movement of the movable furniture part 3 is damped. In the embodiment shown, the damping device 25 is designed as a, preferably hydraulic, piston-cylinder unit. The housing 9 of the electric drive unit 10 is detachably fastened to a receiving profile 23, which is to be screwed to a strip 24 extending vertically in the mounting position, via a snap connection. The furniture drive 4 comprises a about a pivot axis 1 1 pivotally mounted ejection lever 12 with an ejection surface 14 which cooperates in the mounting position with the first lever arm 18 of the angle lever 15. A spring device 28, which comprises at least one tension spring designed as a helical spring, is anchored with a first end region to the slider 22 and with a second end region to a spring base 29 which is preferably adjustable relative to the base plate 8. By the spring device 28, the plunger 6, the ejection lever 12, and / or the angle lever 15 after a discharge operation again in a standby position, which corresponds to the closed end position of the movable furniture part 3, resettable. At the free end of the plunger 6, a first part 31 of a locking device 30 is arranged, held by the movable furniture part 3 in the full closed position and / or can be moved towards the end of the closing movement in the full closed position. For this purpose, a part 31 is arranged at the free end of the plunger 6, which cooperates with a corresponding part which is arranged or formed on the movable furniture part 3, magnetically.

Fig. 4a-4d show the ejection process of the plunger 6 in time sequences. In Fig. 4a, the closed position of the plunger 6 is shown, which also corresponds to the closed end position of the movable furniture part 3. Here, the free end of the first lever arm 18 of the angle lever 15 is loosely adjacent to the ejection surface 14 of the ejection lever 12 adjacent to the rotation axis 1 1 of the ejection lever 12. At the beginning of the ejection process is thus a relatively short force arm (ie, the distance between the axis of rotation 1 1 and that point at which the ejection lever 12 and the first lever arm 18 of the angle lever 15 contact each other), wherein a predetermined torque M of the electric drive unit 10 is translated into a larger force F on the movable furniture part 3. The point at which the first lever arm 18 of the angle lever 15 rests against the ejection surface 14 of the ejection lever 12 moves during the ejection process, starting from a region adjacent to the axis of rotation 1 1 of the ejection lever 12 along the ejection surface 12 toward a free lever end 13 of the ejection lever 12 towards, with a uniform change of the power arm causes and jumps in the force exerted are avoided. The free end of the second lever arm 19 of the angle lever 15 acts - directly or indirectly - together with the plunger 6. In the illustrated embodiment is the second lever arm 19 of the angle lever 15 via at least one, preferably curved, push lever 20 with the slider 22 of the plunger 6 in conjunction.

Fig. 4b shows a further extended position of the plunger 6. The driven by the electric drive unit 10 ejection lever 12 has been rotated about the pivot axis 1 1, whereby the angle lever 15 is pivotable about the axis of rotation 16. By this rotation of the angle lever 15 and the linearly movable slide 22 of the plunger 6 in the ejection direction is further moved in the direction of arrow 32. Fig. 4c shows a further extended position of the plunger 6, wherein the damping device 25 is reset in the form of the linear damper by the force of a (not shown) return spring in a ready position for the next damping stroke. The movement of the plunger 6 is now carried out at a lower power transmission, which decreases in a further ejection movement of the ejection lever 12. The transmitted to the plunger 6 force decreases so, however, a more rapid extension movement of the plunger 6 is brought about.

Fig. 4d shows the fully extended position of the plunger 6. A user can solve the movable furniture part 3 by engaging behind from the magnetic coupling of the part 31 and move further in the direction of the open position. However, if the magnetic coupling between the part 31 of the locking device 30 and the movable furniture part 3 is not canceled by the user, the movable furniture part 3 is retracted after a predetermined period of time - while maintaining the magnetic coupling. This is brought about by a control or regulation unit of the furniture drive 4, which resets the ejection lever 12, so that by the force of the spring device 28 a return of the plunger 6 and thus a recovery of the movable furniture part 3 (which is magnetically coupled to the plunger 6 ) in the closed end position is possible. On the movable furniture part 3 is of course a corresponding part of the locking device 30 to arrange or form, so that between the part 31 and the movable furniture part 3, a magnetic attraction can be produced. Alternatively, it is possible, for example, to form the movable furniture part 3 at least partially metallic, wherein the magnetically formed part 22 -. optionally by interposing a plastic pad for noise reduction - directly on a metallic portion of the movable furniture part 3 is effective. A particular advantage of the invention is apparent, namely that a force deflection and thus an angular ejection of the plunger 6 with respect to the ejection direction of the ejection lever 12 is possible by the construction shown. In FIG. 4d, namely, the direction 32 of the linear movement of the plunger 6 can be seen, which runs essentially parallel to a longitudinal direction (L) of the housing 9 of the furniture drive 4.

The furniture drive 4 with the angle lever 15 can thus provide very high ejection forces, whereby this particular is suitable for ejecting refrigerator doors or freezer flaps. Due to the prevailing negative pressure in refrigerators or freezers, these are often difficult to open, which is further complicated by the arrangement of a magnetic seal (which seals the refrigerating compartment). The furniture drive 4 according to the invention can remedy this situation, wherein it can be provided that the furniture drive 4 is combined to form a common modular unit and that - apart from any electrical cables - only the plunger 6 protrudes from this common unit.

Claims

Patent claims

Furniture drive (4) for ejecting a movable furniture part (3) from a closed end position relative to a furniture body

(2), comprising:

- a housing (9);

- an electric drive unit (10) arranged in or on the housing (9);

- an ejection lever (12) which can be driven by the electric drive unit (10) and which is rotatably mounted about a pivot axis (1 1) relative to the housing (9);

- A linearly movable plunger (6) that can be driven by the ejection lever (12) for ejecting the movable furniture part

(3);

characterized in that the furniture drive (4) has a reduction mechanism (5) which converts a pivoting movement of the ejection lever (12) into a linear movement of the plunger (6), the reduction mechanism (5) having at least one rotatable about an axis of rotation (16). Angle lever (15) with two lever arms (18, 19), a first lever arm (18) of the angle lever (15) with the ejection lever (12) and a second lever arm (19) of the angle lever (15) with the linearly movable plunger ( 6) cooperates and wherein the axis of rotation (16) of the angle lever (15) and the pivot axis (1 1) of the ejection lever (12) are arranged stationary relative to one another.

Furniture drive according to claim 1, characterized in that the ejection lever (12) rests on the first lever arm (18) of the angle lever (15) in a sliding or rolling manner.

Furniture drive according to claim 1 or 2, characterized in that the ejection lever (12) and/or the first lever arm (18) of the angle lever (15) each have at least one convexly curved section for mutual contact.

4. Furniture drive according to one of claims 1 to 3, characterized in that the first lever arm (18) of the angle lever (15) has a free end, which in the closed end position of the movable furniture part (3) on an ejection surface (14) of the ejection lever (12) is applied.

5. Furniture drive according to claim 4, characterized in that the point at which the first lever arm (18) of the angle lever (15) rests on the ejection surface (14) of the ejection lever (12) is during the ejection process starting from one to the axis of rotation (1 1 ) of the ejection lever (12) adjacent area moves along the ejection surface (14) towards a free lever end (13) of the ejection lever (12).

6. Furniture drive according to one of claims 1 to 5, characterized in that the second lever arm (19) of the angle lever (15) is connected to at least one - preferably curved - push lever (20), which is connected to the linearly movable plunger (6). interacts.

7. Furniture drive according to one of claims 1 to 6, characterized in that the first and second lever arms (18, 19) of the angle lever (15) enclose an acute angle relative to one another.

8. Furniture drive according to claim 7, characterized in that the angle that the first and second lever arms (18, 19) of the angle lever (15) enclose relative to one another is constant in all operating positions of the angle lever (15).

9. Furniture drive according to one of claims 1 to 8, characterized in that the first and second lever arms (18, 19) of the angle lever (15) are formed in one piece.

10. Furniture drive according to one of claims 1 to 9, characterized in that a spring device (28) is provided, through which the plunger (6), the ejection lever (12), and / or the angle lever (15) again after an ejection process a ready position, which corresponds to the closed end position of the movable furniture part (3), can be reset.

1 1 . Furniture with a movable furniture part and a furniture drive according to one of claims 1 to 10.

12. Furniture according to claim 1 1, characterized in that the plunger (6) rests against the movable furniture part (3) in the closed end position.

13. Furniture according to claim 1 1 or 12, characterized in that a locking device (30) is provided, through which the movable furniture part (3) is held in the completely closed position and / or can be moved into the completely closed position.

14. Furniture according to claim 13, characterized in that the locking device (30) comprises at least two parts (31), a first part (31) being arranged or formed on the plunger (6) and a second part being arranged or formed on the movable furniture part (3). , whereby the two parts (31) exert a magnetic attraction on one another in the closed position of the movable furniture part (3).