EP1318737A1

EP1318737A1 - Furniture drive embodied as a double drive

Info

Publication number: EP1318737A1
Application number: EP01960617A
Authority: EP
Inventors: Eckhart Dewert
Original assignee: Linak AS; Cimosys Ltd
Current assignee: Linak AS
Priority date: 2000-09-21
Filing date: 2001-08-03
Publication date: 2003-06-18
Anticipated expiration: 2021-08-03
Also published as: DK1318737T3; DE20115507U1; ES2256282T3; EP1318737B1; AU2001282063A1; CN100496339C; ATE313988T1; US20040020316A1; JP2004508866A; WO2002024035A1; DE50108571D1; CN1461195A; JP4920166B2; US7331557B2; DE10046750C1

Abstract

A furniture drive which is embodied as a double drive and used to move parts of a piece of furniture in relation to each other. The furniture drive comprises two drive units, each one having a linearly movable drive element for pivoting a pivot lever which co-operates with a part to be moved of the piece of furniture when the furniture drive is in the assembly position. The linearly movable drive element or an actuating element connected thereto comprises a recess into which the pivot lever projects in the radial direction thereof when the furniture drive is in the assembled position. An inner wall of the recess forms a bearing surface for the pivot lever. The furniture drive has a low overall height and a simple design, and can thus be produced economically.

Description

Furniture drive designed as a double drive

The invention relates to a furniture drive designed as a double drive of the type mentioned in the preamble of claim 1 for adjusting parts of a piece of furniture relative to one another. Furniture drives of this type are generally known and are used, for example, as adjusting drives for adjusting parts of a slatted frame relative to one another. EP 0 372 032 B1 discloses a furniture drive designed as a double drive for adjusting parts of a piece of furniture relative to one another, which has two drive units. In the known furniture drive, each drive unit interacts with a swivel lever which is in operative connection with a part of the furniture to be adjusted in the installation position of the furniture drive. In the known furniture drive, each drive unit has a linearly movable drive element which is connected to the pivot lever for pivoting the same in effect. Here, the pivot lever is designed as an angle lever on which the linearly movable drive element, which is formed by a spindle nut arranged on an adjusting spindle, exerts a compressive force for pivoting the pivot lever and is thus in operative connection with the pivot lever. A similar furniture drive is known from DE 38 42 078 C2, in which each drive unit also interacts with a swivel lever. In the furniture drive known from this publication, the linearly movable drive element is formed by a spindle nut which is connected to a holding leg of a right-angled thrust piece running parallel to the spindle axis, the other, lower right to the spindle axis standing pressure leg loosely applied to the free end of the pivot lever and is thus in operative connection with the pivot lever.

EP 0 583 660 B1 is a furniture drive of the type in question designed as a double drive

Adjustment of parts of a piece of furniture relative to one another is known which has two drive units. Each drive unit of this furniture drive has a linearly movable drive element in the form of a spindle nut, which serves for pivoting a pivot lever which is in effect in the assembly position of the furniture drive with a part of the furniture to be adjusted. At its end facing the pivot lever, the spindle nut has a slot running perpendicular to the spindle axis, into which the pivot lever engages with a pin arranged at its end and extending essentially parallel to the pivot axis of the pivot lever, and is guided closely therein. A disadvantage of this known furniture drive con- sists in the fact ^'that it is complicated in structure. In addition, asymmetrical loads on the pivot lever occur in this known furniture drive, since the force application point of the drive element lies outside the longitudinal center plane of the pivot lever. The invention has for its object to provide a furniture drive designed as a double drive of the type mentioned in the preamble of claim 1, which is simple in construction and thus inexpensive to manufacture and robust. This object is achieved by the teaching specified in claim 1.

According to the teaching of claim 1, the linearly movable drive element or an actuating element connected to it has a recess into which the pivoting lever, which is usually not part of the furniture drive, but of a piece of furniture, for example a slatted frame, projects into the mounting position, an inner wall of the recess forming a contact surface for the pivoting lever.

This results in a simple and therefore inexpensive construction of the furniture drive according to the invention with ^' relatively few components.

A particular advantage of the furniture drive according to the invention is that the swivel lever can be made shorter than in the known furniture drives. In this way, the furniture drive according to the invention can be designed with a relatively low overall height. This has the essential advantage that when combining, for example, a slatted frame with a furniture drive according to the invention, the unit thus formed has a height that is not or only slightly greater than the height of the slatted frame alone. Another advantage of the furniture drive according to the invention is that it is robust in structure and suitable for applying large forces.

It is also advantageous that, in the furniture drive according to the invention, the force application point of the actuating element on the pivot lever can lie in its longitudinal center plane, so that an asymmetrical loading of the pivot lever is avoided.

The furniture drive according to the invention is designed as a double drive. While maintaining the principle of action according to the invention, it is also possible to design the furniture drive as a single drive.

An extremely advantageous development of the teaching according to the invention provides that Position surface at least one slot is provided for receiving the lever arm of the pivot lever in at least one end position of the adjustment movement and that the pivot lever bears against the contact surface with a contact part away from the slot. In this embodiment, the free end of the pivot lever can protrude deeply into the recess, so that the furniture drive has a particularly low overall height. Currency ^'end abuts the pivot lever with the bearing part against the bearing surface, an undesired abutment of the lever arm of the pivot lever is removed avoided by the installation part on the contact surface, since this part is of the pivoting lever in the slot received. This embodiment thus enables a large swivel angle of the swivel lever with a very compact structure at the same time.

A further development of the aforementioned embodiment provides that the system part extends essentially parallel to the pivot axis of the pivot lever. In this embodiment, the ground ^'extends part thus transversely to the slots, wherein a secure installation is ensured at the contact surface.

Another, extremely advantageous development provides that the pivot lever is fork-shaped with two mutually parallel and spaced lever arms and the contact part is held between the lever arms of the pivot lever. This embodiment also enables a large pivoting angle of the pivoting lever with a compact structure at the same time. Due to the spaced-apart lever arms is a relative to the longitudinal center plane of the pivot lever symmetrical introduction of force from the drive ^'member or facilitating the actuating element in the pivot lever. Asymmetrical loads on the swivel bels that could lead to its deformation and possibly damage are thus avoided.

A further development of the aforementioned embodiment provides that the contact surface is formed on a projection, the clear width between the lever arms of the pivot lever essentially corresponding to the extension of the projection in this direction or being greater than this. In this embodiment, the pivot lever rests with its contact part on the contact surface during the adjustment movement, while the lever arms move laterally along the projection.

Another development of the embodiment with the fork-shaped pivot lever provides that two slots are formed in the contact surface or in the region of the contact surface parallel to the pivot axis of the pivot lever and extend essentially perpendicular to the pivot axis of the pivot lever to receive the spaced lever arms of the pivot lever in an end position of the adjustment movement. In this embodiment, the stability of the part in which the recess is formed is improved compared to the aforementioned embodiment.

Basically, in the embodiment with the slot, it is sufficient that at least one slot is formed only in the contact surface. An expedient development provides, however, for a slot or a plurality of slots to be formed in an inner wall of the recess facing away from the contact surface, a slot being assigned to each lever arm of the pivoting lever for receiving the lever arm in at least one end position of the adjustment movement. In this way, the lever arm of the pivot lever is prevented from abutting the inner wall of the recess opposite the contact surface, so that the pivot angle that can be achieved ω t to μ> o LΠ o LΠ o Cπ

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However, the contact surface is inclined relative to the linear axis of movement of the drive element. In this way, the achievable pivot angle of the pivot lever is increased. In the aforementioned embodiment, the contact surface can be a substantially flat surface, which is preferably inclined at an acute angle relative to the linear axis of movement of the drive element. However, the contact surface can also be at least partially arcuate in cross section, an imaginary connecting line between end points of the arcuate cross section of the contact surface being inclined at an acute angle relative to the linear movement axis of the drive element. In these embodiments, particularly favorable conditions result with regard to the articulation angle of the pivot lever on the contact surface.

A further development of the embodiment with the contact surface which is arcuate in cross section provides that the cross section is concave towards the pivoting lever.

According to another advantageous development, the clear width between the contact surface and an opposite inner wall of the recess is greater than the extension of the pivot lever or the contact part between the contact surface and the opposite inner wall. In this way, jamming of the pivoting lever or the system part in the recess is prevented. The part in which the recess is formed can be made of any suitable material. The part expediently consists of plastic, as is provided by a further development. In this embodiment, the manufacture of the invention Furniture drive further simplified and thus designed more cost-effective, since the drive element or the actuating element can be a simple and inexpensive molded part made of plastic. The linearly movable drive element can be designed in any suitable manner. An expedient development provides that the linearly movable drive element is non-rotatable and axially movable on a spindle nut held on a rotationally drivable adjusting spindle. Such spindle drives are available as simple and inexpensive standard components, so that the manufacture of the furniture drive according to the invention is further simplified and is therefore more cost-effective. Since the spindle nut is usually a molded part made of plastic, the recess can be molded into the spindle nut during manufacture.

In a kinematic reversal of the above-mentioned embodiment, the linearly movable drive element can, however, also be an adjusting spindle which is mounted in its axial direction and is secured against rotation and on which a stationary, rotationally drivable spindle nut is arranged.

Another development of the teaching according to the invention provides that the pivoting lever is connected in a rotationally fixed manner in the mounting position of the furniture drive to a rotatably mounted shaft which is in operative connection with a part of the furniture to be adjusted. The pivot lever is usually not part of the furniture drive, but an adjustment fitting, for example on a slatted frame. However, the pivot lever can also be part of the furniture drive.

Other expedient developments provide that each drive unit has an electric motor and / or that the drive units of the double drive are accommodated in a common housing.

The invention is explained in more detail below with the aid of the attached, highly schematic drawing, in which an exemplary embodiment is shown.

It shows :

Fig. 1 in a highly schematic side view ^{~ "} an embodiment of a furniture drive according to the invention, wherein from

Part of the housing in which the drive units are accommodated is omitted for the sake of illustration,

2 shows a view from below in FIG. 1 of an actuating element of a drive unit of the exemplary embodiment according to FIG. 1,

3 shows a section along a line A-A in FIG. 2,

FIG. 4 shows a drive unit of the

1 in a first adjustment position,

5 in the same representation as FIG. 4, the drive unit according to FIG. 4 in a second adjustment position,

6 shows a highly schematic side view of an embodiment of a support device for upholstering a seating and / or reclining furniture in the form of a slatted frame, which is provided with a furniture drive according to FIG. 1, in a first adjustment position,

7 the support device according to FIG. 6 in a second adjustment position, ω t CO μ ¹ M o LΠ O LΠ O u.

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System held on the contact surface 34, which in this embodiment is formed by a roller which is rotatably mounted on the pivot lever 18 about an axis parallel to the pivot axis 16. The adjustment position of the drive unit 4 shown in FIG. 4 corresponds in the exemplary embodiment to a first end position in which the parts of the piece of furniture (not shown in FIG. 2) that can be adjusted by means of the furniture drive are not adjusted relative to one another. In this end position, the roller 54 is disengaged from the contact surface 34, as can be seen in FIG. 4. Here, the lever arm 52 of the pivot lever 18 engages in the slot 50, while the other lever arm, which cannot be seen in the drawing, engages in the slot 48.

In order to pivot the pivot lever 18 and thus to adjust a part of a piece of furniture which is in operative connection with the pivot lever 18 and is not shown in FIG. 4, the spindle nut 12 is driven in rotation by the electric motor 14 in such a way that. the adjusting spindle 10 moves together with the actuating element 20 to the right in FIG. 4. Here, the swivel lever 18 runs with its roller 54 onto the contact surface 34, which acts loosely on the swivel lever 18 in the further course of the adjustment movement and one

Exerts tensile force on the pivot lever 18, due to which the pivot lever 18 in Fig. 4 pivoted clockwise about its pivot axis 16.

In the further course of the adjustment movement, the roller 54 moves along the contact surface 34 in FIG

Fig. 4 upwards, so that the pivot lever 18 pivots further about its pivot axis 16.

When pivoting, the pivot lever 18 adjusts a part of a not shown in FIGS. 1 to 5 ω CO CO μ ¹ M o LΠ o LΠ O cn

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Avoid that when a part of a piece of furniture adjusted by means of the pivoting lever 18 tries to move the pivoting lever 18 further clockwise in the second end position of the adjusting movement shown in FIG. 5 under the influence of a user, the roller on the wall 42 System arrives and the actuating element is thereby subjected to pressure.

6 shows a support device provided with the furniture drive 2 for supporting an upholstery of a seating and / or reclining furniture, which in this embodiment is formed by a slatted frame 56. The slatted frame 56 has a frame 58 and a plurality of supporting parts which are connected to one another in an articulated manner. Specifically, the slatted frame has a central support part 60, with one side of which is connected in an articulated manner and pivotable about a horizontal pivot axis, an upper body support part 62 is connected with the side facing away from the central support part 60 in an articulated manner and pivotable about a horizontal pivot axis a head support part 64 , A leg support part or thigh support part 66 is connected in an articulated and pivotable manner about a horizontal pivot axis to the side of the middle support part 60 facing away from the upper body support part 62, and a calf support part 68 is connected to the side facing away from the central support part 60 and pivotable about a horizontal pivot axis. ι

To adjust the leg support part 66 and the leg support part 68 relative to the central support part 60, a pivotable adjustment lever 70 is provided, which is connected in a rotationally fixed manner to a pivot shaft 72, with which the pivot lever 18 is also connected in a rotationally fixed manner. The adjusting lever 70 is thus pivoted together with the pivot lever 18 about its pivot axis 16. bar. The underside of the leg support part 68 lies loosely on the adjusting lever 70.

To adjust the upper body support part 62 and the head support part 64 relative to the central support part, a further adjustment lever 74 is provided, which is connected in a rotationally fixed manner to a further pivot shaft 76, with which the pivot lever 18 'assigned to the drive unit 4' is also connected in a rotationally fixed manner. The further adjusting lever 74 can thus be pivoted together with the pivoting lever 18 'about its pivot axis 16'.

With the end 78 of the adjusting lever 74 facing away from the pivot lever 18 ', an end 80 of a link lever 82 is connected in an articulated manner, the other end 84 of which is articulatedly connected to the headrest part 64. 6 shows the slatted frame 56 in a position in which the support parts 62, 64, 66, 68 are not adjusted relative to the central support part 60. To adjust the leg support part 66 and the calf support part 68 relative to the central support part 60, the electric motor 14 drives the spindle nut 12 in such a way that the adjusting spindle 10 moves to the right with the actuating element in FIG. 6, so that the pivot lever 18 is moved from the Actuating element 20 is entrained and in this case pivoted clockwise about its pivot axis 16 in FIG. 6. Accordingly, the pivots accordingly

Adjustment lever 70 in a clockwise direction and adjusts the calf support part 68 together with the leg support part 66, until the end position of the adjustment movement shown in FIG. 7 is reached. In a corresponding manner drives to adjust the

Upper body support part 62 and the head support part 64 relative to the central support part 60 of the electric motor 14 'of the drive unit 4', the spindle nut 12 'in such a way that the adjusting spindle 10' with the actuating

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8 shows an actuating element 20 of a second exemplary embodiment of a furniture drive 2 according to the invention, which differs from the actuating element 20 according to FIG. 2 primarily in that it has only a single slot 90 in the area of the contact surface 34 extends from the contact surface 34 in the direction of the end 26 of the actuating element 20 and extends essentially perpendicularly to the pivot axis 16 of the pivot lever not shown in FIG. 8. In contrast to the exemplary embodiment shown in FIGS. 1 to 7, the pivot lever is not fork-shaped in this exemplary embodiment, but rather has only one lever arm. An abutment part, also not shown in FIG. 8, is arranged at the free end of the pivot lever and extends transversely to the slot 90 such that the abutment part bears against the abutment surface 34 on both sides of the slot 90. The fact that in the contact surface 34 only one

Slot 90 is provided, the stability of the actuating element 20 is improved in this embodiment. In addition, the actuator 20 is easier to manufacture. FIG. 9 shows a longitudinal section through the actuating element 20 according to FIG. 8 in the region of the slot 90. From FIG. 9 it can be seen that the wall 42 of the recess 22 facing away from the contact surface 34 in this exemplary embodiment is perpendicular to the linear movement axis 40 runs. 8 and 9, the adjusting spindle is not shown, which can be subjected to tensile and compressive stress with the end 24 of the actuating element 20 facing away from the contact surface 34.

Claims

claims

1. A furniture drive designed as a double drive for adjusting parts of a piece of furniture relative to one another, with two drive units, each drive unit having a linearly movable drive element for pivoting a pivot lever which is in operative connection with a part of the piece of furniture to be adjusted,

characterized,

that the linearly movable drive element or an actuating element (20) connected to it has a recess (22) 'into which the pivoting lever (18) protrudes in its radial direction in the mounting position of the furniture drive (2), and

that an inner wall of the recess (22) forms a contact surface (34) for the pivot lever (18).

2. Furniture drive according to claim 1, characterized in that in the contact surface (34) or in the region of the contact surface at least one slot (44, 46) for receiving the lever arm (52) of the pivoting lever (18) is provided in an end position of the adjustment movement and that the pivot lever (18) lies away from the slot (44, 46) with a contact part on the contact surface (34).

3. Furniture drive according to claim 2, characterized in that the plant part extends substantially parallel to the pivot axis (16) of the pivot lever (18).

4. Furniture drive according to claim 1, characterized in that the pivot lever (18) is fork-shaped with two mutually parallel and spaced lever arms (52) and that the contact part between the lever arms (52) of the pivot lever (18) is held.

5. Furniture drive according to claim 4, characterized in that the contact surface (34) is formed on a projection, the clear width between the lever arms (52) of the pivot lever (18) corresponds essentially to the extension of the projection in this direction or larger than this.

6. Furniture drive according to claim 4, characterized in that in the contact surface (34) or in the area of

Contact surface (34) two slots spaced parallel to the pivot axis (16) of the pivot lever (18) and essentially perpendicular to the pivot axis (16) of the pivot lever (18) are formed for receiving the spaced lever arms (52) of the pivot lever (18) in an end position of the adjustment movement.

7. Furniture drive according to claim 1, characterized in that in one of the contact surface (34) facing away from the inner wall (42) of the recess (22) a slot or a plurality of slots (48, 50) is or are, each lever arm (52) A slot (48, 50) is assigned to the pivoting lever (18) for receiving the lever arm (52) in an end position of the adjustment movement.

8. Furniture drive according to claim 6 or 7, characterized in that the clear width of each slot (44, 46; 48, 50) substantially the extension of the associated lever arm (52) in the direction parallel to the pivoting Axis (16) of the pivot lever (18) corresponds or is slightly larger than this.

9. Furniture drive according to claim 1, characterized in that the contact part is formed by a preferably mounted on the free end of the pivot lever (18), rotatably mounted roller (54).

10. Furniture drive according to claim 1, characterized in that the drive element or the actuating element (20) is designed to be open on one side towards its side facing the pivoting lever (18) in the assembly position.

11. Furniture drive according to claim 1, characterized in that the contact surface (34) is inclined relative to the linear axis of movement (40) of the drive element.

12. Furniture drive according to claim 11, characterized in that the contact surface is a substantially flat surface.

13. Furniture drive according to claim 12, characterized in that the contact surface (34) is inclined at an acute angle relative to the linear movement axis (40) of the drive element.

14. Furniture drive according to claim 11, characterized in that the contact surface (34) is at least partially arcuate in cross-section.

15. Furniture drive according to claim 14, characterized in that an imaginary connecting line between End points (36, 38) of the arcuate cross section of the contact surface (34) relative to the linear axis of movement (40) of the drive element is inclined at an acute angle.

16. Furniture drive according to claim 14, characterized in that the contact surface (34) to the pivot lever (18) is concave in cross section.

17. Furniture drive according to claim 1, characterized in that the clear width between the contact surface (34) and an opposite inner wall (42) of the recess (22) is greater than the extent of the pivot lever (18) or the contact part between the contact surface ( 34) and the opposite inner wall (42).

18. Furniture drive according to claim 1, characterized in that the part in which the recess is formed consists of plastic.

19. Furniture drive according to claim 1, characterized in that the linearly movable drive element is a non-rotatable and movable in the axial direction on a rotatably driven adjusting spindle nut.

20. Furniture drive according to claim 1, characterized in that the linearly movable drive element is a movable in its axial direction, non-rotatably mounted adjusting spindle (10) on which a stationary, rotationally driven spindle nut (12) is arranged.

21. Furniture drive according to claim 1, characterized gekennzeich- net that the pivot lever (18) in the mounting position of the furniture drive (2) is rotatably connected to a rotatably mounted shaft which is in operative connection with a part of the furniture to be adjusted.

22. Furniture drive according to claim 1, characterized in that each drive unit (4, 4 ') has an electric motor (14, 14').

23. Furniture drive according to claim 1, characterized in that the drive units (4, 4 ') of the double drive are accommodated in a common housing (6).