ACTUATOR

Description

[0001] The present invention relates to an actuator arm drive for at least one pivotably mounted actuator arm with the features of the preamble of claim 1 and to a piece of furniture with at least one such actuator arm drive.

[0002] In the prior art, a variety of actuators for assisting the opening and closing movement of furniture flaps are known. It is usually provided that the force exerted by the actuator on the furniture flap is adjustable. Such adjustability can be achieved, for example, by adjusting the point of application of the force originating from a power storage device of the actuator to a driven lever of the actuator arm.

[0003] Disadvantages of conventional actuator arm drives known in the prior art include the force required by a user to adjust the force application, the small adjustment range of the setting, the indirect relationship between the selected setting and the resulting force, and the undesirable noise generation due to unfavorable loading of the parts of the actuator arm drive associated with the setting when pivoting the actuator arm.

[0004] The applicant's WO 2015 / 135005 A1 shows an actuator for moving a flap of a piece of furniture.

[0005] The object of the invention is to provide an improved actuator arm drive compared to the prior art.

[0006] This problem is solved by an actuator arm with the features of claim 1 and by a piece of furniture with such an actuator arm. Advantageous embodiments of the invention are defined in the dependent claims.

[0007] The problem is solved according to the invention by introducing the force onto the main lever at the force introduction point via a force introduction element acted upon by the energy storage device via a lever, and by designing the adjusting device to adjust the force introduction element along a contact contour formed on the main lever. The main lever can be understood as a lever of the adjusting arm upon which the force originating from the energy storage device acts. The force introduction point can be understood as the point, line, or surface at or on which the force is introduced onto the main lever. The force introduction element can, in turn, be understood as a component or group of components that bears against the main lever and introduces the force originating from the energy storage device onto it. The main lever has a contact contour formed on it for this purpose.The adjusting device is designed to adjust the force application element along the contact contour to set the force application point on the main lever. By adjusting the force application element along the contact contour, the distance of the force application point to the pivot axis of the pivotally mounted main lever can be changed, thereby adjusting the drive force of the actuator arm. By introducing the force onto the main lever via a force application element that rests against a contact contour formed on the main lever, direct force transmission and easy adjustment of the force application point are achieved.

[0008] According to the invention, in every pivot position of the main lever between the open and closed positions of the actuator arm drive, and in every setting of the adjusting device, the applied force introduction element is forced along the contact contour in the same direction. The pivot position of the actuator arm drive can be understood as the position of the actuator arm or the main lever of the actuator arm. The setting of the adjusting device can be understood as the position of the force introduction element along the contact contour formed on the main lever. Because the force introduction element is forced along the contact contour in the same direction in every pivot position of the main arm, a load-change-free opening and / or closing movement of the actuator arm drive can be achieved.The component of the force originating from the energy storage device, with which the force introduction element is acted upon in the direction of the system contour (tangential force), is thus aligned or oriented in the same way in every pivot position of the main lever between the open and / or closed position of the actuating arm drive.

[0009] According to the invention, the plant contour is curved.

[0010] A curved design of the contact surface can lead to particularly advantageous adjustability of the force application element and, consequently, to improved adjustability of the actuator arm. In particular, a curved contact surface can result in a larger adjustment range of the adjusting device, combined with the property that the force application element is forced in the same direction along the contact surface in every pivot position of the main lever and in every setting of the adjusting device. A curved contact surface can also create a particularly direct relationship between the setting of the adjusting device (position of the force application element along the contact surface) and the setting of the actuator arm (force acting on a flap).

[0011] It can be advantageous that the curvature of the system contour is constant. A system contour with a constant curvature is easy to manufacture and can enable a particularly favorable relationship between the setting of the adjusting device and the setting of the actuator arm.

[0012] According to the invention, the plant contour is concavely curved.

[0013] In the case of a concave curvature of the mounting contour inclined towards the force introduction element, a large adjustment range of the adjusting device can be made possible, along with the property that the force introduction element is always forced in the same direction along the mounting contour.

[0014] According to the invention, in a pivot position of the main lever corresponding to the open position of the actuating arm drive, the line of action of the force acting on the main lever from the energy storage device forms an acute angle with the contact contour in every setting of the adjusting device. An open position of the actuating arm drive can correspond to a pivot position of the main lever in which a flap of furniture driven by the actuating arm drive is in an open position. Because the line of action along which the force originating from the energy storage device acts on the main arm forms an acute angle with the contact contour in every setting of the adjusting device—i.e., at every point of the force introduction element along the contact contour—a preferred adjustability of the adjusting device and an extended adjustment range can be achieved.In particular, this allows for a uniform force application to the force introduction element across the entire adjustment range of the adjusting device. This prevents load changes, especially in the open position of the actuator arm, and enables load-free adjustment of the device.

[0015] It can also be advantageous for the main lever to have a profiled cross-section and for the contact contour to be formed on the end faces of the profile. A profiled cross-section of the main lever, for example in the form of a U-profile, allows for a particularly stable design of the actuator arm. Forming the contact contour on the end faces of the profile simplifies the manufacturing process for the actuator arm. This also allows the force acting on the main lever to be distributed across multiple points or a larger area.

[0016] It can be further advantageous for the force introduction element to have, at least in sections, a contour that deviates from the cylindrical surface, preferably with a curvature that corresponds to the curvature of the contact contour. Due to this contour, the force introduction point of the force introduction element on the contact contour can be configured as a line or surface contact. If the curvature of the force introduction element corresponds to the curvature of the contact contour, a particularly preferred form of contact between the force introduction element and the contact contour can result.

[0017] It can be advantageous for the force introduction element to be designed as a profiled transverse bolt and / or as a roller and / or as a slide. A transverse bolt can be understood as a bolt or a rod-shaped component running essentially perpendicular to the line of action of the force originating from the energy storage device. A slide can be understood as a sliding component that rests against the surface. The profile of the transverse bolt can also be designed such that it results in a flat contact with the mounting contour.

[0018] A further advantage can be that the adjusting device is self-locking. This allows a setting made on the adjusting device to remain in place during operation of the actuator arm without the need for additional locking mechanisms.

[0019] Furthermore, it can be advantageous for the adjusting device to include a transmission device that translates an adjusting movement of the adjusting device into a translational movement of the force application element. The transmission device thus allows the position of the force application element along the surface contour to be adjusted by an adjusting movement of the adjusting device. The transmission device can, for example, convert a rotational movement into a translational movement.

[0020] It can be advantageous for the transmission device to consist of a threaded spindle rotatably mounted on the main lever, with a T-nut engaging in the threaded spindle and connected to the force transmission element. By actuating the threaded spindle, which is rotatably mounted on the main arm, the force transmission element can thus be adjusted together with the T-nut.

[0021] A further advantage is that the T-nut is slidably mounted in a guide track – preferably essentially straight – formed in the main lever and is articulated to the force transmission element via an intermediate piece. The T-nut can be mounted in a rotationally fixed yet slidable manner in a guide track formed in the main lever and articulated to the force transmission element via an intermediate piece. This intermediate piece can transmit tensile or compressive loads. When the rotatably mounted threaded spindle is actuated, the T-nut can thus be adjusted together with the force transmission element along the guide track formed in the main lever. The force transmission element and / or the T-nut can each be pivotally or rotatably mounted on or in the intermediate piece, thereby forming an articulated connection between the force transmission element and the T-nut.

[0022] According to the invention, in a pivot position of the main lever corresponding to the open position of the actuator arm drive, the force introduction element is adjusted along the contact contour essentially transversely to the line of action of the force from the energy storage device acting on the main lever. By adjusting the force introduction element along the contact contour essentially transversely to the line of action of the force acting from the energy storage device, a particularly direct relationship can be achieved between the setting of the adjusting device (position of the force introduction element along the contact contour) and the setting of the actuator arm drive (force on a driven furniture component).

[0023] Furthermore, it can be advantageous that, in a position of the main lever corresponding to the closed position, the line of action of the force acting on the main lever from the energy storage device runs in relation to the pivot axis of the main lever in such a way that the main lever is forced into the closed position. This makes it possible to actively hold a furniture component driven by the actuator arm in both a closed and an open position. For example, in a position of the main lever corresponding to the closed position, the line of action of the force originating from the energy storage device can, in the mounting position of the actuator arm, run above the pivot axis of the main lever, thus forcing the main arm into the closed position.When the main lever pivots out of the closed position, the line of action of the force acting on the main arm from the energy storage device can, for example, in the mounting position of the actuator arm, run below the axis of rotation of the main lever (dead center mechanism), and the opening movement of the actuator arm can be supported by the energy storage device. Upon reaching the open position, the main lever can also be actively forced into the open position.

[0024] It can also be advantageous for the energy storage device to have at least one spring – preferably installed lying flat in the housing's mounting position. By incorporating a spring, for example a compression spring, the energy storage device can be designed to be easily manufactured and durable. With a spring installed lying flat in the housing of the actuator arm, i.e., running essentially horizontally, a space-saving design of the actuator arm can be achieved, which is particularly advantageous. The force of the spring can be transmitted to the main arm or the force application element via a deflection lever and a articulated transmission lever connected to it.

[0025] Protection is also sought for a piece of furniture with at least one actuator arm drive as described above. The furniture can have a cabinet body in which the actuator arm drive can be mounted, and at least one cabinet door that can be driven by the actuator arm drive.

[0026] Further details and advantages of the present invention are explained in more detail below with reference to the description of the figures and the exemplary embodiments illustrated in the drawings. These show: Fig. 1a a perspective view of a piece of furniture, Fig. 1b a perspective sectional view of a piece of furniture, Fig. 2a to 2 a side view of a sectional view of a piece of furniture with different positions of the adjusting arm drive, Fig. 3 a perspective view of an adjusting arm drive, Fig. 4a to 4c a side view of an adjusting arm drive in different swivel positions, Fig. 5a a side view of a sectional view of an adjusting arm drive, Fig. 5b a detail view of the in Fig. 5a Fig. 6 shows a side view of two levers of an adjustable arm drive, Fig. 7a to 7 shows a side view of a sectional view of a piece of furniture, Fig. 8 and 8a shows a side and detail view of a piece of furniture with an adjustable arm drive in a first position, Fig. 9 and 9a shows a side and detail view of a piece of furniture with an adjustable arm drive in a second position, and Fig. 10 and 10a shows another side and detail view of a piece of furniture with an adjustable arm drive in different positions.

[0027] Fig. 1a Figure 1 shows a piece of furniture 3 with a cabinet 30, inside of which, beneath a cabinet lid 31, two actuators 1 are mounted. A movable flap 4 is attached to the actuator arms 2 of the actuators 1 and is thus pivotally mounted on the cabinet 30 by means of the actuators 1. The actuator 1 is attached to the cabinet 30 via a housing 5, which is fitted with a housing lid 55.

[0028] Fig. 1b shows a perspective view of a cross-sectional representation of the in Fig. 1a The furniture 3 shown, wherein the actuating arm drive 1 is shown without the housing cover 55 of the housing 5. As before, a flap 4 is attached to the actuating arm 2 of the actuating arm drive 1.

[0029] Fig. 2a bis 2d The figures show the course of an opening movement – ​​or, in reverse order, the course of a closing movement – ​​of a piece of furniture 3 with a pivotally mounted flap 4. The following is shown in Fig. 2a The closed position of the actuator 1 is shown, in which the furniture body 30 is closed by the flap 4. As in the design of the Fig. 2a As shown, the actuator 1 has a pivotally mounted actuator 2 with several levers connected by joints. Here, parts of the main lever 6, which is pivotally mounted on the housing 5, the intermediate lever 7, which is pivotally mounted on the housing 5, and part of the support lever 10, which is designed to secure the flap 4, are visible. In the closed position of the actuator 1 shown, the main lever 6, the intermediate lever 7 (which is pivotally connected to it), and the support lever 10 project from a longitudinal side 52 of the housing 5. In the closed position of the embodiment shown, the end face 51 of the housing 5 of the actuator 1, facing the inside of the flap 4, is free of any projecting levers of the actuator 2 and is essentially flush with the furniture body 30.

[0030] Fig. 2b Figure 3 shows a piece of furniture 3 with a partially open flap 4. The actuating arm 2 of the actuating arm drive 1, which supports the flap 4, is partially pivoted out of the closed position. In this position of the actuating arm 2, pivoted towards the open position, the articulated levers of the actuating arm 2 protrude partially from the longitudinal side 52 of the housing 5 and partially from the end face 51 of the housing 5. In addition to the main lever 6, the nested intermediate levers 7, 8 and the pivotally mounted support lever 10 are visible.

[0031] Fig. 2c Figure 3 shows a piece of furniture 3 with a furniture flap 4 pivoted further towards the open position. The actuating arm 2 supporting the flap 4 is pivoted further towards the open position, so that, in addition to the main lever 6 and the nested intermediate levers 7, 8 and the support lever 10, the guide lever 9, pivotally mounted on the housing 5, is also visible. As shown, the levers form a nested seven-joint kinematic mechanism. In this pivoted position of the actuating arm 2, the longitudinal side 52 of the housing 5 is already free of protruding levers, thus significantly facilitating access to the interior of the furniture 3 for the user. Consequently, in this pivoted position of the actuating arm drive 1, which is close to the open position, the levers forming the actuating arm 2 only protrude from the end face 51 of the housing 5.

[0032] In Fig. 2d Figure 3 shows a piece of furniture with a fully open flap 4. The actuating arm 2 of the actuating arm drive 1 is in the open position, which is characterized by the fact that the levers forming the actuating arm 2 project from the end face 51 of the housing 5. In contrast to the closed position of the actuating arm drive 1, the longitudinal side 52 of the housing 5, which directly adjoins the end face 51, is free of projecting levers in the open position of the actuating arm drive 1.

[0033] Fig. 3 Figure 1 shows a perspective view of an actuator 1 with its housing cover removed. The orientation of the actuator 1 essentially corresponds to the mounting position in a piece of furniture 3 shown in the preceding figures. The housing 5 of the actuator 1 contains a power storage unit 11 with a horizontally mounted, essentially horizontal spring 12, a deflection lever 13 pivotally connected to the spring and mounted on the housing 5, and a transmission lever 14 pivotally connected to the deflection lever. The actuator 1 also has a damping device 24 for damping the pivoting movement of the actuator 2 during a closing movement. The actuator 2 is mounted in the position shown in Figure 1. Fig. 3 The illustrated embodiment of the actuator 1 comprises a main lever 6 pivotably mounted on the housing 5 about a first pivot axis S1, two intermediate levers 7 and 8 pivotally mounted on the main lever 6, a guide lever 9 pivotally mounted on the second intermediate lever 8 and on the housing 5 about a second pivot axis S2, and a support lever 10 pivotally mounted on the intermediate levers 7 and 8. The guide lever 9 is formed by a first lever 91 and a second lever 92 connected to it, as well as a third lever 93 (not shown here). The main lever 6 and the first intermediate lever 7 have a profiled cross-section, essentially corresponding to a U-profile, and are arranged nested within one another. Furthermore, the first intermediate lever 7 and the second intermediate lever 8 are arranged nested within one another, as is the case for the second intermediate lever 8 and the guide lever 9.Overall, the nested arrangement of the main lever 6, the intermediate levers 7 and 8, and the guide lever 9 results in a particularly stable design of the actuating arm 2 with a very small footprint. The main arm 6 is subjected to a force by the energy storage device 11 via a force introduction element 16. The force introduction element 16 is pivotally connected to the transmission lever 14 of the energy storage device 11 and also pivotally connected to the adjusting device 15 attached to the main lever 6. The force introduction point x1 of the force introduction element 16 is located on the main lever below the pivot axis S1, whereby the energy storage device 11 effectively exerts a torque on the main lever 6, causing the actuating arm 2 to pivot towards the open position without external force.

[0034] Fig. 4a Figure 1 shows a side view of an actuator 1 with the housing cover removed. The actuator 2 of the actuator 1 is in the closed position, as shown. In this position, the force from the energy storage device 11 acts on the main lever 6 of the actuator 2 via the transmission lever 14, actively forcing the main lever 6 into the closed position. The line of action of the force originating from the energy storage device 11 runs along the transmission lever 14 in relation to the pivot axis S1 of the main lever 6 (above the pivot axis S1), such that the main lever 6 is actively pivoted into the closed position and held there by means of the force introduction element 16, which is connected to the main arm 6 by the adjusting device 15. The adjusting device 15 is in the form of a threaded spindle 20 rotatably mounted on the main arm 6 (see also Figure 15). Fig. 5a The main lever 6 consists of a T-nut 21 slidably mounted in the threaded spindle 20 and a guide track 22 formed in a substantially straight line in the main arm 6, and an intermediate piece 23 pivotally connected to the T-nut 21 and the force introduction element 16. The threaded spindle 20, the T-nut 21, and the intermediate piece 23 are arranged at least partially in the interior of the profiled main lever 6. A contact contour 17 is formed on end faces 18 of the main lever 6 for the force introduction element 16 to bear against, and the adjusting device 15 is designed to adjust the force introduction element 16 along the contact contour 17.

[0035] In Fig. 4b An actuator arm 1 with an actuator arm 2 partially pivoted out of the closed position is shown. This is shown by comparison with the Fig. 4a The nested structure of the levers of the actuating arm 2, which form a seven-joint kinematic system, is evident. In this pivot position of the actuating arm 2, the line of action of the force acting on the main arm 6, which runs along the transmission lever 14 of the energy storage unit 11, is such that it is oriented relative to the pivot axis S1 of the main lever 6 (below the pivot axis S1) that the actuating arm 2 is forced further towards the open position. The overlap of the two intermediate levers 7, 8, which is essentially gap-free in a lateral direction to the pivoting movement of the actuating arm 2, is also clearly visible. Fig. 4c Figure 1 shows an actuator 1 with an actuator 2 in the open position. The levers forming the actuator 2 protrude from the end face 51 of the housing 5 of the actuator 1. As shown, the adjusting device is in a position in which the force application element 16 is positioned at a first force application point x1 on the contact contour 17. In this position, the radial distance between the pivot axis S1 of the main lever 6 and the first force application point x1 is at its maximum, resulting in a large force from the energy storage device 11 acting on the actuator 2. Further along the pivot axis S1, there is another position of the adjusting device 15 in which the stylistically indicated force application element is located at the second force application point x2 (see also Figure 1). Fig. 9a ). In the open position of the actuating arm drive, the force application point of the force application element 16 on the contact contour 17 of the main lever 6 is adjusted essentially transversely to the line of action of the force running along the transmission lever 14. As in Fig. 7d The use of the actuating arm drive 1 with a piece of furniture 3 with a flap 4 driven by the actuating arm drive 1 has the advantage that an adjustment of the adjusting device 15 corresponds directly to the force acting on the flap 4 (compensation of the force exerted on the actuating arm 2 by the weight of the flap 4).

[0036] Fig. 5a shows a side view of a sectional representation of an actuator arm drive 1 in a configuration as shown in Fig. 4c The pivot position of the adjusting arm 2 is shown. In addition to the power storage unit 11 housed in the casing 5, the main lever 6 with the adjusting contour 17 formed on one of the end faces 18 is also shown. The individual parts of the adjusting device 15 are also shown in this sectional view. Specifically, these are the threaded spindle 20, rotatably mounted on a bearing point 28 formed in the main arm 6, and the T-nut 21 mounted therein, as well as the intermediate piece 23, which is pivotably connected to the T-nut 21 and the force transmission element 16.When the threaded spindle 20 rotates, the non-rotating T-nut 21 can be moved along the spindle in the guide track 22 of the main lever 6 (not visible here), whereby the intermediate piece 23, which is pivotably connected to the T-nut 21, and the force introduction element 16 are also moved and – acted upon by the transmission lever 14 of the energy storage device 11 – the force introduction element 16 comes to be located at a different point on the contact contour 17.

[0037] To ensure effective visual and pinch protection in every swivel position of the adjusting arm 2, apertures 29 can be provided which cover openings that occur in the housing 5 or in the adjusting arm 2 itself when swiveling.

[0038] Further are in Fig. 5a The second lever 92 of the guide lever 9 and the third lever 93, which serves to compensate for tolerances and is inserted between the axle bolts 27 of the guide lever 9, are shown. These will now be discussed in more detail below.

[0039] Fig. 5b shows a detailed view of the in Fig. 5a The sectional view of the actuator 1 is shown. In particular, the parts of the adjusting device 15 and two of the levers of the guide lever 9 are shown. Specifically, the second lever 92 of the guide lever 9 is shown, with the housing-side pivot pin 27 forming the pivot axis S1 and the further pivot pin 27 serving for the pivotable bearing of the second intermediate lever 8. The third lever 93, which has a corrugated shape, has an axle bore 25 at one end, by which it is received on the further pivot pin 27. At the other end, the third lever 93 has a recess 26 by means of which the third lever 93 is pivoted or clipped onto the pivot pin 27 forming the pivot axis S1.It may be provided that the axle bolts 27 are spread apart by the spring-elastically deformed lever 93 in such a way that any radial play of the axle bolts 27 in the bearing points of the housing 5 or the levers that may exist due to manufacturing tolerances can be compensated for.

[0040] In Fig. 6 The first lever 91 and the third lever 93 are shown. The representation of the first lever 91 can also correspond to the representation of the second lever 92, provided they are identical in form. The first lever 91 has two axle bores 25, the centers of which have a first standard distance d1. To ensure a pivotable bearing of the first lever 91 (and also of the second lever 92), the axle bores 25 can have a slightly larger bore diameter than the axle bolts 27 (not shown here) provided for receiving them. The third lever 93, which has a curved, wavy shape, also has two axle bores 25 in this embodiment, but their centers have a second standard distance d2, which differs from the first standard distance d1.When the guide lever 9 is assembled from the first lever 91, the second lever 92, and the third lever 93, preferably arranged between them, the third lever 93 can be pre-tensioned to the first standard distance d1 by stretching or compressing, so that it retains its pre-tension in the installed state. This can lead to a stabilization of the guide lever 9 assembled from the individual levers.

[0041] In the Figuren 7a bis 7d is analogous to the Figuren 2a bis 2d An opening process or, in reverse order, a closing process of a piece of furniture 3 with a flap 4 driven by an actuator 1 is shown, wherein the actuator 1 is shown without the housing cover 55.

[0042] In Fig. 8 und Fig. 8a A side and detail view of a piece of furniture 3 with a substantially fully opened flap 4 is shown. As shown in detail section A of Fig. 8a As can be seen, the adjusting device 15 of the actuator 1 is in a first position in which the force introduction element 16, which transmits the force from the energy storage device 11 to the main arm 6, is located at a first force introduction point x1 along the contact contour 17 formed on the main lever 6. In this first position of the adjusting device 15, the T-nut 21, which is displaceable in the guide track 22 by the threaded spindle, is located, as shown, at a first end of the guide track 22, away from the contact contour 17. The connection between the T-nut 21 and the force introduction element 16, provided by means of the intermediate piece 23, positions the latter at a force introduction point x1 on the contact contour 17, away from the pivot axis S1.

[0043] Fig. 9 und Fig. 9a show a side and detail view of a piece of furniture 3 with a substantially fully open flap 4, as shown in detail section A of Fig. 9a The adjusting device 15 of the actuator 1 is in a second position. In this second position, the T-nut 21, mounted on the threaded spindle 20, is located at a second end of the guide track 22 facing the contact contour 17. The connection between the T-nut 21 and the force introduction element 16 via the intermediate piece 23 positions the force introduction element 16 at a second force introduction point x2 along the contact contour 17, near one of the pivot axis S1. This contrasts with the first position (see Fig. 8 und Fig. 8a ) in this second setting of the adjusting device 15 the torque exerted on the main lever 6 is minimal, making this setting suitable for compensating the weight force of flaps 4 with low weight.

[0044] In the Figuren 8, 8a , 9 und 9a It is clearly evident that the contact contour 17 has a concave curve, which runs essentially transversely to and inclined towards the line of action of the force from the energy storage device 11 along the transmission lever 14. The curved design of the contact contour 17 ensures that, when the adjusting device 15 is adjusted – and the force acting on the main arm 6 from the energy storage device 11 is thereby adjusted – the spring preload of the spring 12 of the energy storage device 11 remains essentially unchanged by the pivoting of the transmission lever 14 associated with adjusting the adjusting device 15.This also ensures that, in every pivot position of the actuator 1 between the closed and open positions, the force introduction element 16 is always forced in the same direction along the contact contour 17, thus preventing undesirable load changes during operation of the actuator 1. In the embodiments of the actuator shown in the preceding figures, this specifically means that, in every pivot position of the actuator 1 between the open and closed positions, the force introduction element 16 is essentially always forced in the direction of the pivot axis S1 along the contact contour 17, thereby ensuring that the adjusting device is always under tensile stress.A reversal of the direction in which the force introduction element 16 is forced along the system contour 17 would result in a change of direction of the load (load change) especially of the adjusting device 15, which would lead to an undesired instability of the actuator arm drive 1 and potentially to noise generation of the actuator arm drive 1 due to backlash.

[0045] Fig. 10 und Fig. 10a show a side and detail view of a piece of furniture 3 with a flap 4 in the open position, with detail section A of Fig. 10aThe lines of action of the force acting from the energy storage device 11 on the main arm 6 along the transmission lever 14 are shown. In a first setting of the adjusting device 15, the force introduction element 16 is located at a first force introduction point x1 along the contact contour 17. The tangent t1 illustrates the inclination of the contact contour 17 at the first force introduction point x1. If the contact contour 17 were straight, the force introduction element 16 would be displaced along the tangent t1 when the adjusting device 15 was adjusted. At a second force introduction point x2, an obtuse angle β (greater than 90°) would thus result between the line of action leading to the second force introduction point x2 and the tangent to the contact contour.If, on the other hand, the mounting contour 17 is curved, specifically concave towards the line of action of the force, it can be achieved that the angle α enclosed by the line of action of the force at the point of force application x2 and the inclination of the mounting contour 17 illustrated by the tangent t2 is an acute angle (less than 90°).

Claims

1. Actuating arm drive (1) for at least one pivotably mounted actuating arm (2), in particular for driving a flap (4) of a piece of furniture (3), with a pivotably mounted main lever (6), an energy storage mechanism (11), by means of which a force for supporting the opening and / or closing movement of the actuating arm drive (1) can be exerted on the main lever (6) at a force-transmission point (x1, x2), and a setting device (15) for setting the force-transmission point (x1, x2) on the main lever (6), wherein the force is transmitted to the main lever (6) at the force-transmission point (x1, x2) via a force-transmission element (16) loaded by the energy storage mechanism (11) via levers (13, 14), and the setting device (15) is formed to adjust the force-transmission element (16) along a bearing contour (17) formed on the main lever (6), wherein the loaded force-transmission element (16) is pushed along the bearing contour (17) in the same direction in every pivot position of the main lever (6) between the open position and the closed position of the actuating arm drive (1) and in every setting of the setting device (15), wherein a component of the force originating from the energy storage mechanism (11) with which the force-transmission element (16) is loaded in the direction of the bearing contour (17) is oriented identically in every pivot position of the main lever (6) between the open position and / or the closed position of the actuating arm drive (1), characterized in that in a pivot position of the main lever (6) corresponding to the open position of the actuating arm drive (1), in every setting of the setting device (15), the line of action of the force from the energy storage mechanism (11) acting on the main lever (6) forms an acute angle with the bearing contour (17), wherein in a pivot position of the main lever (6) corresponding to the open position of the actuating arm drive (1) the force-transmission element (16) is adjusted along the bearing contour (17) substantially transversely to the line of action of the force from the energy storage mechanism (11) acting on the main lever (6), wherein the bearing contour (17) is formed concavely curved.

2. Actuating arm drive (1) according to the preceding claim, wherein the main lever (6) has a profiled cross section and the bearing contour (17) is formed at end faces (18) of the profile.

3. Actuating arm drive (1) according to at least one of claims 1 or 2, wherein the force-transmission element (16), at least in sections, has a contour deviating from the cylindrical surface and preferably corresponds in its curvature to the curvature of the bearing contour (17).

4. Actuating arm drive (1) according to at least one of the preceding claims, wherein the force-transmission element (16) is formed as a profiled transverse pin and / or as a roller and / or as a slide.

5. Actuating arm drive (1) according to at least one of the preceding claims, wherein the setting device (15) is formed self-locking.

6. Actuating arm drive (1) according to at least one of the preceding claims, wherein the setting device (15) has a transfer device (19) which converts a setting movement of the setting device (15) into a translational movement of the force-transmission element (16).

7. Actuating arm drive (1) according to claim 6, wherein the transfer device (19) is formed by a threaded spindle (20) rotatably mounted on the main lever (6) with a sliding block (21), which is connected to the force-transmission element (16), engaging in the threaded spindle.

8. Actuating arm drive (1) according to claim 7, wherein the sliding block (21) is mounted displaceably in a guideway (22) - preferably running substantially in a straight line - formed in the main lever (6) and is connected in an articulated manner to the force-transmission element (16) via a connecting piece (23).

9. Actuating arm drive (1) according to at least one of the preceding claims, wherein in a position of the main lever (6) corresponding to the closed position the line of action of the force from the energy storage mechanism (11) acting on the main lever (6) runs in relation to the pivot axis (S1) of the main lever (6) in such a way that the main lever (6) is pushed into the closed position.

10. Actuating arm drive (1) according to at least one of the preceding claims, wherein the energy storage mechanism (11) has at least one spring (12) - preferably installed lying down in the installed position of the housing (5).

11. Piece of furniture (3) with a furniture carcass (30), an actuating arm drive (1) according to at least one of the preceding claims and at least one flap (4).