EP3207828B1 - Furniture drive - Google Patents

Description

The invention relates to a drive for adjusting mutually movable parts of furniture, in particular of armchairs, according to the preamble of claim 1.

Generic drives are used for adjusting movable furniture parts to each other. In the furniture, which have these mutually movable parts, it may be, for example, sitting or lying furniture, for example, beds, armchairs, sofas or slatted frames. For example, the drives are used to adjust the reclining position of a bed or the relative position of chair seat and chair back to each other. For example, they are also used to adjust the angle of inclination of a support surface in desks or tables. In this case, generic drives usually have a housing in which a slide and a driven by an electric motor spindle are arranged. The slider is connected to the spindle so that it can be linearly displaced over the spindle in a longitudinal direction. The spindle in turn is driven by an electric motor. In a known embodiment of generic drives, the electric motor drives a spindle nut, wherein the spindle is rotatably connected to the slider, so that by a rotation of the spindle nut relative to the spindle, a linear displacement of the slider is effected. In another embodiment of generic drives, the electric motor drives the spindle to rotate, wherein on the slide a spindle nut is provided, which is rotationally fixed to the slider, so that a linear displacement of the slider is effected by a rotation of the spindle nut relative to the spindle , Typically, generic drives on a housing in which the slide, the spindle and the electric motor are arranged.

Furthermore, generic drives have an output element which is likewise arranged in the housing, that is to say at least in sections in the housing. In generic drives, the arrangement comprising the slide, the spindle and the output element in the housing is set so that the components of the arrangement assume mutually defined positions. In this case, the slide and the driven element are arranged and formed relative to each other, that via a linear displacement of the slider in the longitudinal direction, a rotation of the driven element is effected about a rotation axis, wherein the rotation axis is usually perpendicular to the longitudinal direction in generic drives. For this purpose, the slide and the driven element are connected to each other via an operative connection. In one embodiment of a generic drive, the output element is designed as a lever which has a first lever arm, which rests against an end face of the slider, and a second lever arm, which is connected to a furniture part to be moved. In this case, the output element is rotatably mounted about a rotation axis, so that a movement of the slider causes a corresponding movement of the first lever arm in the longitudinal direction, whereby due to the rotatable mounting of the output element of the second lever arm is pivoted about the axis of rotation. Generic drives allow relative movement of furniture parts movable to one another, in particular one Angular adjustment of such movable furniture parts. However, there are various problems with generic drives. For example, generic drives require considerable space due to their design comprising slide and rotatably mounted lever. This also contributes to the fact that a considerable force must be exerted on the movable furniture parts usually why housing, slide and lever must be designed according to robust and an electric motor must be provided with a sufficiently large torque. For example, generic drives are often difficult to install, since a compound of the lever of the drive with a moving furniture part often can be accomplished only complicated.

A generic drive is in the DE 202007005130 U1 disclosed. In this, the operative connection, which connects the slide with the output element, an interlocking toothing between the slide and the driven element, wherein the driven element extends with a driven portion in a transverse direction above the meshing teeth, and wherein the intermeshing teeth on a in the Transverse direction lower end portion of the slider is provided.
The present invention has for its object to provide a novel drive for adjusting mutually movable parts of furniture.

As a solution to the above problem underlying the invention, the invention proposes a drive with the features of claim 1. The drive according to the invention comprises a housing in which an arrangement is arranged, which guides a linearly displaceable in a longitudinal direction Slider and connected to the slider via an operative connection output member comprises. The arrangement is designed to effect a rotation of the output element about an axis of rotation during a linear displacement of the slider in the longitudinal direction. By way of example, the housing can have a guide rail running linearly in the longitudinal direction, in which the slider is guided. The drive according to the invention may comprise, for example, an electric motor and a spindle, the spindle extending in the longitudinal direction and with the slider connected to move the slider linearly along the longitudinal direction. According to the invention, the operative connection comprises an interlocking toothing between the slide and the driven element. In this case, the driven element extends with a driven portion in a transverse direction above the meshing toothing, wherein the meshing toothing is provided at a transversely lower end portion of the slider. The transverse direction is in particular perpendicular to the axis of rotation and / or perpendicular to the longitudinal direction. The output section may be designed for coupling to a transmission shaft with which a rotation of the output element can be transmitted to a movable furniture part. In any case, the output element extends with respect to the transverse direction in sections above the meshing teeth. The intermeshing toothing is provided at a lower end portion of the slider with respect to this transverse direction, that is, at a portion of the slider along the transverse direction extending from the lower end of the slider in the transverse direction and at most half, in particular at most one Third, in particular at most a quarter of the maximum extension of the slider in the transverse direction extends. In this case, the slider can be formed in one piece or in several parts. For example, the slider may have a drive portion connected to the spindle for ensuring the drivability of the slider by the spindle, that is, the displaceability of the slider in the longitudinal direction by the spindle, wherein the slider has a toothed portion, which is for providing the intermeshing teeth is formed with the output element. Gear section and drive section can be arranged consecutively in the longitudinal direction and, for example, each be made separately and then fixed to each other positionally fixed for the realization of the slide. The interlocking interlocking between Slider and driven element can be ensured for example by the fact that the output element has at least one projection which engages in at least one recess of the slider. Likewise, of course, the teeth can be ensured by the fact that the slider has at least one projection which engages in at least one recess of the output element. For example, the output member may be formed in the manner of a gear, wherein the slider has a toothed portion which is formed in the manner of a rack.

The drive according to the invention has various advantages. On the one hand, it is ensured by the interlocking toothing between slide and output element that the operative connection between slide and output element is bidirectional. Both in positive and negative movement of the slider along the longitudinal direction thus a respective force transmission from the slider to the output element is made possible, so that a relative movement of two furniture parts in a positive and a negative direction are respectively performed under force load by the drive according to the invention can. In addition, the most compact design of the drive according to the invention is ensured by the interlocking teeth. In addition, by the relative arrangement of slide and driven element to each other, in which the output member extends with a driven portion in the transverse direction above the toothing and the toothing is provided at a transversely lower end portion of the slider, ensures that the largest possible lever arm is provided between the teeth and the rotation axis while maintaining the smallest possible space, so that with the drive according to the invention in a simple manner, a high torque can be applied to the moving furniture parts to each other.

In one embodiment, a plurality of first gear elements are arranged on the output element, wherein at the lower end portion of the slider a plurality of second gear elements are arranged, which are spaced apart in the longitudinal direction. Particularly preferably, the first gear elements are spaced apart in the longitudinal direction. In the cited advantageous embodiment, at least one of the first toothed elements engages at least one of the second toothed elements in order to provide the operative connection. For example, the first gear elements and the second gear elements may be formed as an array with mutually corresponding projections and recesses, which engage for providing the intermeshing toothing. For example, the first gear elements may each be formed as a projection and the second gear elements each as a recess. For example, the first gear elements may each be formed as a recess and the second gear elements each as a projection. The operative connection and thus the interlocking toothing between slide and driven element is always provided by the interaction of at least one first toothed element with at least one second toothed element.

Particularly preferably, the first gear elements are arranged in a circular arc-shaped arrangement. As a result, a reliable operative connection between the slide and the output element can be ensured over a wide position range of the slide along the longitudinal direction and over a wide angular position range of the output element about the axis of rotation. Particularly preferably, the axis of rotation lies in the center of the circular arc of the circular arc-shaped arrangement. Particularly preferably, the second gear elements are arranged in a linear arrangement, in particular in a linear arrangement along the longitudinal direction.

Conveniently, it can be provided that the output element has a running around a pivot center arcuate portion with radially directed projections and gaps between these projections for the design of the first gear elements, said arrangement may be formed in the manner of a gear segment. In this case, longitudinally arranged on the slider and each extending transversely to the longitudinal extent of the second toothing elements may be provided, wherein first and second toothing elements are arranged and arranged to provide an operative connection between the slide and driven element, to mesh with each other. In this case, the slider may be arranged so that it extends at a distance from the pivot center of the output element.

In one embodiment, the slider has a drive section, wherein along the direction of the axis of rotation laterally on the drive section, the second toothed elements are arranged. The second gear elements are thus arranged at a side end with respect to the direction of the rotation axis of the drive section. In one embodiment, the drive section is arranged in the longitudinal direction in alignment with the spindle. In one embodiment, the second gear elements are arranged offset with respect to the direction of the axis of rotation to the spindle and arranged offset with respect to the longitudinal direction of the spindle. In one embodiment, the second gear elements are designed as recesses provided laterally on the drive section. In one embodiment, the second gear elements are formed as rod-like elements which project laterally from the drive section. Particularly preferably, the rod-like elements have a rounded, in particular elliptical, in particular circular cross-section. Thereby a particularly wear-free and at the same time positive engagement of first and second toothing elements can be ensured. For this purpose, the first gear elements are particularly preferably designed as gear teeth, which have a belly. The described advantageous embodiments with laterally provided on the drive section second gear elements allow a particularly simple implementation of a particularly robust and at the same time compact drive.

In one embodiment, a first group of second gear elements is arranged on a first side of the drive section of the slider, and a second group of second gear elements is arranged on a second side of the drive section. In this case, "lateral" or "side" refers to a side with respect to the direction of the axis of rotation. The output element has a first toothed section with a first group of the first toothed elements and a second toothed section with a second group of the first toothed elements. The drive section is arranged between the two gear sections of the output element, wherein the first group of the first gear elements cooperates with the first group of the second gear elements, and wherein the second group of the first gear elements cooperates with the second group of second gear elements. Particularly preferably, the first group of the first gear elements cooperates exclusively with the first group of the second gear elements and the second group of the first gear elements exclusively with the second group of second gear elements.

By providing the two different groups of first and second gear elements and the arrangement of the drive portion of the slider between the toothed portions of the output member, a particularly uniform Power transmission from the slider to the output member without an oblique load of the slider to be ensured. For this purpose, it is particularly advantageous that the drive portion of the slider is arranged with respect to the direction of the axis of rotation between the toothed portions, wherein the drive portion is arranged in one embodiment in the longitudinal direction offset from the toothed portions. It should be noted that the slider is adapted to be driven via its drive portion, that is to be displaced in the longitudinal direction, for example by a spindle is coupled to the drive portion of the slider. For example, the slider may have in its drive portion a threaded bore corresponding to a spindle in a conventional manner to allow displacement of the slider along the longitudinal direction via the spindle. In one embodiment, the two gear portions of the output member are formed as a portion of a gear or as a gear, wherein the drive portion of the slider is disposed between the gear portions. In one embodiment, the gear portions overlap with the drive portion in the transverse direction to provide guidance of the drive portion. In this case, the toothed sections of the output element thus extend over a section in the transverse direction away laterally next to the drive section of the slide. With a corresponding overlap between toothing sections and drive section, the stability of the drive can be further improved by the provided guidance of the drive section of the slide and thus of the slide. For this purpose, an overlap of the drive section with the toothing sections along the longitudinal direction may be particularly preferably provided.

In one embodiment, the slider has a transfer section, which is designed in the manner of a perforated rail is. The output element has a corresponding transmission section, which is designed in the manner of a gear. Due to the design of the transfer section of the slide as a perforated rail can be provided in a particularly simple and cost-effective manner, a stable operative connection between the output element and slide. In one embodiment, the slider has a transmitting portion and a driving portion arranged successively in the longitudinal direction. In one embodiment, the slide is made in several parts, wherein the transfer section is formed as one of the several parts and made separately from the other parts. Particularly preferably, the transmission portion of the slide is formed in the manner of a U-profile, wherein the arrangement comprising slide and driven element is formed so that in the U-profile of the transmission section of the corresponding transmission portion of the driven element is guided. By this lateral guidance between the output element and slide the stability of the drive can be further increased.

In one embodiment, the output element has a passage extending along the axis of rotation, which has a cross section which is suitable for receiving a transmission shaft with a corresponding cross section. Particularly preferably, the bushing is provided in the output section of the output element.

The drive according to the invention may comprise the transmission shaft arranged in the feedthrough. Particularly preferably, the cross-section of the bushing and the corresponding cross-section of the transmission shaft are formed relative to one another such that a fixation of the transmission shaft in the bushing via the mutually corresponding cross-sections is provided with respect to a rotation about the rotation axis. About the transmission shaft can a rotation of the driven element are transmitted to a movable furniture part by the transmission shaft is connected to the furniture part. For example, the transmission shaft may be formed as a rotation axis of the furniture part. Particularly preferably, the cross section of the passage on a section with two mutually parallel sides. The cross-section of the bushing may be formed, for example, at least in sections as a polygon, in particular as a square, rectangle or trapezoid. By providing a section with two mutually parallel sides and / or by the at least partially formed as a polygon configuration of the cross section, a rotation of the transmission shaft to the output element can be ensured particularly efficient and easy.

In one embodiment, the transmission shaft is formed in the manner of a tube with a round cross section, on which a driver is fixed in a fixed position. In one embodiment, the transmission shaft is designed in the manner of a rod with a round cross section, on which a driver is fixed in a fixed position. In a design as a pipe, a low weight and a low moment of inertia can be ensured due to the proposed cavity. On the other hand, a rod made of solid material can be made particularly stable. The driver may for example be welded to the pipe or rod, riveted or screwed. The cross section of the passage corresponds to the common cross section of the pipe or rod and driver. The corresponding cross section of the transmission shaft is thus formed by the arrangement of the tube and the carrier fixed thereto or formed by the arrangement of the rod and the carrier fixed thereto. In the described embodiment, the transmission shaft can act particularly advantageous as a rotation axis of a furniture part and in a particularly simple manner an anti-rotation be provided between the output element and transmission shaft.

In one embodiment, the bushing has an opening at its transversely upper end for ensuring insertion of the transmission shaft into the passageway perpendicular to the axis of rotation, in particular along the transverse direction. This embodiment enables a particularly simple mounting of the drive according to the invention on a piece of furniture in which the transmission shaft acts as a rotation axis of a furniture part. For in the described embodiment, the drive can be pushed in a simple manner perpendicular to the axis of rotation on the transmission shaft by the transmission shaft slides in the opening of the output element and thus in the implementation of the output element.

Particularly preferably, in a passage along the axis of rotation in the implementation extending perpendicular to the rotational direction driving element is arranged, wherein the driving element is arranged relative to the opening, that the driving element during insertion of the transmission shaft into the passage with a corresponding driving element of the transmission shaft into engagement can be brought. For example, the driving element of the output element may be formed as provided in the implementation pin which is disposed on the opposite side of the opening of the passage, wherein the corresponding driving element of the transmission shaft is formed as a hole in the transmission shaft, in which the pin during the insertion of the transmission shaft is insertable into the implementation. Alternatively, for example, the driving element of the output element may be formed as provided on the opposite side of the opening of the passage hole, wherein the corresponding driving element of the transmission shaft is formed as a pin, for example as a pin welded or bolted to the transmission shaft. By the described embodiments, a particularly easy mountability of the drive to a piece of furniture and a particularly simple rotationally fixed fixation of transmission shaft can be ensured with output element.

According to the invention, at least one circular arc-shaped groove is arranged laterally on the output element, which groove engages in a circular arc-shaped projection which is provided on the housing. Optionally, according to the invention, at least one circular arc-shaped projection is provided laterally on the driven element, which engages in a circular arc-shaped groove which is provided on the housing. Particularly preferably, in the center of the circular arcs which describe the groove and projection, the axis of rotation is arranged. By the described embodiment, a particularly good guidance of the output element in the housing can be ensured during the rotation of the output element about the axis of rotation. The invention further relates to a piece of furniture, in particular a sitting or lying furniture, in particular a chair comprising at least two mutually movable furniture parts and a drive according to the invention. In this case, the housing of the drive is fixedly connected to a first furniture part of the furniture and the output element of the drive with a second furniture part of the furniture connected in a fixed position, with the drive relative movement of the two furniture parts is feasible to each other. In one embodiment of the furniture according to the invention it is provided that the housing of the drive always remains fixed in position, while the driven element with the second furniture part rotates relative to the first furniture part and the housing. In one embodiment, it is provided that the output element and the second furniture part always maintain their position, while the housing and the first furniture part relative to the fixed second furniture part or output element can be adjusted by the drive. In a further embodiment it is provided that change in an adjustment of the two mutually movable furniture parts both furniture parts and thus housing and output element in their position.

The invention further relates to a transmission shaft, which may also be referred to as a pivot shaft, in particular for one or the inventive development of an electromotive furniture drive as described above, with a radially projecting cam lever which is fixedly and rigidly secured to the pivot shaft and by means of an output element an adjustment is actuated. In this case, the pivot shaft can in principle have any cross-section.

It should be noted that such a pivoting or transmission shaft, as further specified below, in all its described embodiments, on the one hand as part of the furniture drive according to the invention and this invention can be further developed, however, on the other hand, each as an independent subject matter.

In particular, in such embodiments, in which the pivot shaft described above and below as part of the furniture drive according to the invention and this invention can be further developed, the driving lever can be generally designed as radially to the pivot shaft projecting driver element, which is fixedly and rigidly fixed to the pivot shaft and which is actuated by means of an output element of an adjustment. In this general understanding, radially extending to the pivot shaft driver elements such as bolts, screws, pins, projections, etc., or even radially projecting from the pivot shaft elements such as the pivot shaft encompassing holding part as a driving lever in the context of the invention for generating a positive connection between the pivot shaft and driven element are considered. This positive connection can be designed in such a way that the driver lever engages radially in a corresponding recess of the output element. In one embodiment, the driving lever may be formed as a pin or the like, which engages in the normal operating state in the recess of the output element. Furthermore, the pin can have positive locking means, which are designed, for example, in the form of projections which at least counteract or inhibit a sliding out of the pin out of the recess or prevent it altogether.

Swivel shafts, which are intended for electromotive furniture drives, often consist of square shafts or round tubes. The problem is the attachment of the driving lever, which are in operative connection with an output member of the adjustment, for example, a forward and zurückfahrbaren slide or a trained as described above output member which is in operative connection with a linearly displaceably guided in a longitudinal slide and with this an arrangement forms, which is arranged in the housing of the drive. In the present invention subject of a pivot shaft or a trained with this pivot shaft furniture drive this is designed as a round profile, wherein the driving lever is positively connected to an attachment point of the pivot shaft with this. By means of this subject matter of the invention, a "local form fit" is created on a hollow shaft which is round in cross section, such a local form fit being created by means of a positive connection between pivot shaft and driving lever.

The local form fit can be achieved by various methods.

In a preferred embodiment of the invention, an additional auxiliary element is provided for producing the positive connection. This can be designed such that on the pivot shaft, a bolt is welded in an approximately radial arrangement. In one embodiment, it may also be provided that an element arranged in a radial arrangement with respect to the pivot shaft, such as a bolt or pin element, which can be rigidly and firmly connected to the pivot shaft in any manner, represents the driving lever for the rigid connection of the pivot shaft and driven element. For this purpose, the driving lever may have a positive connection to the output element.

The bolt may be provided with an external toothing. Such a bolt then expediently engages positively in a pocket of the driving lever, so that a positive connection is created.

Alternatively, the round profile can have at least one transverse hole, wherein a screw or a bolt passes through the transverse hole and is connected to the driving lever.

If the round profile is designed as a round tube, this can be combined with at least one reinforcing element for stiffening the transverse hole, which is arranged within the round tube.

Another variant for generating a local form-fit is to locally transform the pivot shaft formed as a round tube, thereby increasing the stability of the connection. This measure can also be combined with an additional auxiliary element.

If a transverse hole is to be made in the deformed area of the round tube, then this can be provided with inwardly curved edges, wherein these curved edges are preferably provided at both ends of the transverse hole.

In this provided with the curved edges transverse hole, for example, a bolt can be welded.

In all the above embodiments, the round tube may be flattened locally in the region of the attachment point of the driving lever. It can be compressed, for example, oval.

The flattened area may then be provided with the aforementioned transverse hole to secure an additional auxiliary member therein.

As an additional auxiliary element, a screw or a bolt can be inserted through the transverse hole. The screw or the bolt can be screwed or welded into the transverse hole.

As additional reinforcement, a sleeve may be welded into the transverse hole through which the additional auxiliary element engages.

According to a further embodiment of the invention, an insert can be inserted into the round tube in the region of its attachment point.

As an insert, a round tube piece can be provided, which fits positively into the circular shaft designed as a pivot shaft, wherein the round tube is pressed together with the pipe section square. The pipe piece serving as an insert can be made relatively thick-walled, thereby making the attachment point of the pivot shaft very stable.

Alternatively, the insert may also be designed as a square tube, wherein the pivot shaft formed as a round tube is pressed square around the square tube around.

The insert can also be a square block made of solid material, the round tube is then pressed square around the square block around.

In all embodiments of the invention, which are provided with an insert, a transverse hole may be drilled in the region of the fastening point through the round tube and the inserted insert.

Further embodiments may be designed in such a way that the round tube for securing the driving lever is encompassed by a holding part. For example, this encompassing may comprise a polygon-shaped pipe section, which surrounds it in full circumference over a predetermined longitudinal section of the pivot shaft. In this case, designed as a pipe section holding part can be welded to the outer circumferential surface of the shaft, wherein the holding part itself represents the driving lever. In other embodiments, it may also be provided to form on the holding part a radially outwardly projecting projection to the pivot shaft, for example by welding a sleeve or a bolt to the holding part for the design of the driving lever.

In a similar embodiment may also be provided to form the holding part as a round pipe section, which surrounds the pivot shaft circumferentially. It can be provided to provide the holding part on its lateral surface with at least one recess to weld pivot shaft and holding part not only on the end faces of the holding part to the pivot shaft, but also between these two end faces in the region of a radially and partially circumferential recess in the holding part.

Alternatively, the round tube can also be penetrated for attachment of the driving lever and finally both last-mentioned fastening methods can be combined with each other become.

The inventions will be explained below by describing some embodiments with reference to the accompanying drawings.

Fig. 1:

In einer schematischen Prinzipdarstellung einen Querschnitt senkrecht zur Rotationsachse einer Ausführungsform eines erfindungsgemäßen Antriebs;

Fig. 2:

in einer schematischen Prinzipdarstellung eine Anordnung umfassend Schieber und Abtriebselement einer Ausführungsform eines erfindungsgemäßen Antriebs;

Fig. 3:

in einer schematischen Prinzipdarstellung eine Anordnung umfassend Schieber und Abtriebselement einer Ausführungsform eines erfindungsgemäßen Antriebs;

Fig. 4:

in einer schematischen Prinzipdarstellung einen Abschnitt eines Schiebers einer Ausführungsform eines erfindungsgemäßen Antriebs;

Fig. 5:

in einer schematischen Prinzipdarstellung ein Abtriebselement und eine korrespondierende Übertragungswelle einer Ausführungsform eines erfindungsgemäßen Antriebs;

Fig. 6:

in einer schematischen Prinzipdarstellung einen Querschnitt senkrecht zur Rotationsachse einer Anordnung umfassend Abtriebselement und Übertragungswelle einer Ausführungsform eines erfindungsgemäßen Antriebs;

Fig. 7:

eine Anordnung umfassend Abtriebselement und Übertragungswelle einer Ausführungsform eines erfindungsgemäßen Antriebs;

Fig. 8:

ein erstes Ausführungsbeispiel einer erfindungsgemäßen Schwenkwelle, wobei an die Schwenkwelle ein Bolzen angeschweißt ist, der in eine Tasche des Mitnehmerhebels eingreift;

Fig. 9:

ein zweites Ausführungsbeispiel einer erfindungsgemäßen Schwenkwelle mit einem angeschweißten Bolzen mit außenseitiger Verzahnung;

Fig. 10:

ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Schwenkwelle, bei dem die Schwenkwelle mit einem Querloch versehen ist, durch die eine Schraube oder ein Bolzen gesteckt ist;

Fig. 11:

ein Querloch in der Schwenkwelle mit eingebauten Verstärkungselementen;

Fig. 12:

einen Abschnitt der Schwenkwelle mit eingeschweißtem Bolzen;

Fig. 13:

einen Schnitt entlang der Linie XIII-XIII aus Fig. 12;

Fig. 14:

einen Ausschnitt aus der Schwenkwelle mit abgeplatteter bzw. oval gedrückter Befestigungsstelle und eingeschweißter Hülse als Verstärkung;

Fig. 15:

einen Schnitt entlang der Linie XV-XV aus Fig. 14;

Fig. 16:

einen Ausschnitt aus der Schwenkwelle, bei der die Befestigungsstelle lokal vierkantig gepresst ist;

Fig. 17:

eine erste Ausführungsform eines Inserts zum Einsetzen in die Schwenkwelle;

Fig. 18:

eine zweite Ausführungsform eines Inserts zum Einsetzen in die Schwenkwelle;

Fig. 19:

eine dritte Ausführungsform eines Inserts zum Einsetzen in die Schwenkwelle;

Fig. 20:

eine weitere Ausführungsform eines Mitnehmerhebels in Form eines an die Schwenkwelle angeschweißten Halteteils;

Fig. 21:

eine weitere Ausführungsform eines Mitnehmerhebels in Form eines an die Schwenkwelle angeschweißten Halteteils mit einem vom Halteteil radial nach außen erstreckenden Zapfen;

zeigt.Show it:

Fig. 1:

In a schematic schematic representation of a cross section perpendicular to the axis of rotation of an embodiment of a drive according to the invention;

Fig. 2:

in a schematic schematic diagram of an arrangement comprising slide and output element of an embodiment of a drive according to the invention;

3:

in a schematic schematic diagram of an arrangement comprising slide and output element of an embodiment of a drive according to the invention;

4:

in a schematic schematic diagram of a portion of a slider of an embodiment of a drive according to the invention;

Fig. 5:

in a schematic schematic diagram of an output element and a corresponding transmission shaft of an embodiment of a drive according to the invention;

Fig. 6:

in a schematic schematic diagram of a cross section perpendicular to the axis of rotation of an arrangement comprising output element and transmission shaft of an embodiment of an inventive drive;

Fig. 7:

an arrangement comprising the output element and transmission shaft of an embodiment of a drive according to the invention;

Fig. 8:

a first embodiment of a pivot shaft according to the invention, wherein on the pivot shaft, a bolt is welded, which engages in a pocket of the driving lever;

Fig. 9:

A second embodiment of a pivot shaft according to the invention with a welded pin with external toothing;

Fig. 10:

a further embodiment of a pivot shaft according to the invention, wherein the pivot shaft is provided with a transverse hole through which a screw or a bolt is inserted;

Fig. 11:

a transverse hole in the pivot shaft with built-in reinforcing elements;

Fig. 12:

a portion of the pivot shaft with welded bolt;

Fig. 13:

a section along the line XIII-XIII Fig. 12 ;

Fig. 14:

a section of the pivot shaft with flattened or oval depressed attachment point and welded sleeve as reinforcement;

Fig. 15:

a section along the line XV-XV Fig. 14 ;

Fig. 16:

a section of the pivot shaft, in which the attachment point is locally pressed square;

Fig. 17:

a first embodiment of an insert for insertion in the pivot shaft;

Fig. 18:

a second embodiment of an insert for insertion into the pivot shaft;

Fig. 19:

a third embodiment of an insert for insertion into the pivot shaft;

Fig. 20:

a further embodiment of a driving lever in the form of a welded to the pivot shaft holding part;

Fig. 21:

a further embodiment of a driving lever in the form of a welded to the pivot shaft holding part with a radially outwardly extending from the holding part pin;

shows.

In Fig. 1 is a cross section perpendicular to the axis of rotation of an embodiment of a drive 1 according to the invention shown schematically. The drive 1 according to the invention comprises a housing 8, in which a spindle 2, a spindle nut 3, a motor drive 4, a slide 5 and an output element 6 are arranged. Out Fig. 1 it can be seen that in the described embodiment, the spindle nut 3 is driven by a motor drive 4 of an electric motor. The spindle 2 is rotatably connected to the slider 5. Upon rotation of the spindle nut 3 due to a drive by the motor drive 4, the spindle 2 and thus the slider 5 changes the position along the longitudinal direction X. Off Fig. 1 It can also be seen that the output element 6 is designed in the manner of a toothed wheel, which has teeth 61 as the first toothed elements. The slider 5 has as second gear elements rod-like elements 51, which with respect to the direction along the axis of rotation laterally on a drive portion of the Slider 5 are arranged, which is firmly connected to the spindle 2. Out Fig. 1 Furthermore, it can be seen that an active connection between the driven element 6 and the slider 5 is provided by the interlocking toothing of teeth 61 of the output element 6 with the rod-like elements 51 of the slider 5. Due to the relative arrangement of slide 5 and driven element 6 as well as the operative connection provided, a linear displacement of the slide 5 along the longitudinal direction X causes a rotation of the output element 6 about the axis of rotation. In this case, the driven element 6 has a passage 62 which has a square cross-section. In this implementation 62, a transmission shaft 7 with a corresponding, in particular square cross-section or round cross-section with provided thereon drivers are introduced so that the transmission shaft is rotatably connected to the output member 6.

In Fig. 2 an arrangement comprising output element 6 and slide 5 of an embodiment of a drive 1 according to the invention is shown schematically. At the in Fig. 2 In the illustrated embodiment, the driven element 6 has two toothed sections. A first group of teeth 61 is provided on a first toothed section, and a second group of teeth 61 is provided on a second toothed section. The slider 5 has a drive section 53, on one side of which a first group of rod-like elements 51 is provided with respect to a direction along the axis of rotation, and on the second side thereof with respect to a direction along the axis of rotation a second group of rod-like elements 51 is provided. The rod-like elements 51 are each formed like a cylinder and have a circular cross-section. The teeth 61 each have a belly. In the embodiment according to Fig. 2 is the driving portion 53 of the slider 5 with respect to a direction along the rotational axis between the two toothed portions of the driven element 6, wherein the toothed portions of the driven element 6 with the slider 5 in sections along the transverse direction Y and along the longitudinal direction X overlap. As a result, a particularly good guidance of output element 6 and slide 5 is provided to one another. Moreover, by the central provision of a drive portion 53 to which a spindle 2 can be arranged to drive the slider 5, and by providing an interlocking toothing on both sides of the drive portion 53 ensures a particularly uniform force transmission between the slide 5 and driven element 6, so that an oblique loading of slide 5 or driven element 6 is avoided if possible. In the embodiment according to Fig. 2 is in the drive portion 53 of the slider 5, a threaded bore provided, into which a spindle 2 can engage with a corresponding external thread. Accordingly, a displacement of the slider 5 along the longitudinal direction can be effected via a rotation of the spindle 2.

In Fig. 3 an arrangement of a further embodiment of a drive 1 according to the invention is shown schematically. The arrangement according to Fig. 3 differs from the arrangement according to Fig. 2 essentially in that the output element 6 in the embodiment according to Fig. 3 circular arc-shaped projections 63 which are provided with respect to a direction along the axis of rotation laterally on the driven element 6. By means of these circular-arc-shaped projections 63, which engage in corresponding circular arc-shaped grooves of the housing 8 in a drive 1 according to the invention, a particularly good guidance of the output element 6 in the housing 8 is ensured.

In Fig. 4 a section of the slider 5 of an embodiment of a drive 1 according to the invention is shown.

It is in Fig. 4 the transfer section of the slider 5 is shown. This transfer section is designed in the manner of a perforated rail, which is designed in the manner of a U-profile. The U-profile has at its bottom openings 52, which are spaced apart in the longitudinal direction X. In the drive according to the invention, the slider 5 according to Fig. 4 includes, the output element 6 is formed in the manner of a gear whose teeth engage to provide the operative connection between the slide 5 and output element 6 in the openings 52 of the slider 5.

In Fig. 5 the output element 6 and the transmission shaft 7 of an embodiment of a drive 1 according to the invention are shown schematically. Out Fig. 5 It can be seen that in the described embodiment, the transmission shaft 7 is formed in the manner of a tube with a round cross section, on which a driver 71 is fixed in a fixed position. In the embodiment described herein, the driver 71 is welded to the round tube. The driven element 6 has a passage 62 which has a cross section perpendicular to the axis of rotation, which corresponds to the common cross section of the tube and driver 71. In the described embodiment, the transmission shaft 7 may be particularly easily stored in a piece of furniture due to the circular cross-section of its tube, so that the transmission shaft 7 can act as a rotation axis of a furniture part. At the same time, such a cross-section of the transmission shaft 7 is provided in a particularly simple manner via the carrier 71 welded to the tube of the transmission shaft 7, which can be fixed in a rotationally fixed manner to a feedthrough 62 which has a corresponding cross-section. For the rotationally fixed fixation, the insertion of the transmission shaft 7 into the output element 6 alone through the bushing 62 or sliding on is alone of the output element 6 on the transmission shaft 7 along the axis of rotation required.

In Fig. 6 an arrangement of the output element 6 and the transmission shaft 7 of an embodiment of a drive 1 according to the invention is shown schematically. The output member 6 has a passage 62 having an opening at its upper end in the transverse direction Y for ensuring insertion of the transmission shaft 7 into the passage 62 along the transverse direction Y. The passage 62 further has a portion whose sides are parallel to each other and run parallel to the transverse direction Y. This allows a particularly simple insertion of the transmission shaft 7 in the bushing 62. In addition, the transmission shaft 7 as in Fig. 5 illustrates a driver 71, wherein the driver 71 and the tube of the transmission shaft 7 together form a cross section corresponding to the cross section of the passage 62 of the output member 6 for ensuring a rotationally fixed fixation of the transmission shaft 7 relative to the output member. 6

In Fig. 7 an arrangement comprising the output element 6 and the transmission shaft 7 of a drive 1 according to the invention is shown schematically. How to Fig. 6 explained also in the embodiment according to Fig. 7 the output element 6 a bushing 62 having an opening into which the transmission shaft 7 is inserted perpendicular to the axis of rotation. In contrast to the embodiment according to Fig. 6 is in the embodiment according to Fig. 7 at the side of the bushing 62, which is opposite to its opening along the transverse direction Y, a pin 72 is arranged. The pin 72 acts as a driving element of the output element 6, which extends perpendicular to the direction of the axis of rotation. The transmission shaft 7 is formed as a tube with a round cross section and has a hole which is perpendicular is provided to the rotation axis in the transmission shaft 7 and corresponds to a pin 72 of the output element 6. The pin 72 is arranged in the passage, in particular relative to the opening of the bushing 62, that the pin can be brought into engagement with the hole in the transmission shaft 7, while the transmission shaft 7 in the Implementation 62 is introduced.

In all embodiments of the pivot shaft or transmission shaft described below, this is designed as a round tube 101.

According to Fig. 8 is welded to the outer surface of the round tube 101, a bolt 102 which engages in a pocket 103 of a driving lever 104. The driving lever 104 is actuated by means of a slider, not shown in the drawing of an adjusting drive. When the cam lever 104 is operated, the pivot shaft is pivoted by a predetermined angle, respectively.

According to Fig. 9 the drawing is in place of the in Fig. 8 a toothed bolt 105 welded to the outer surface of the round tube 101 shown. The outer toothing 106 serves for the positive connection with a driver not shown in detail in the drawing.

According to Fig. 10 the round tube 101 is provided with a transverse hole 107. Through the transverse hole 107, a screw 108 is inserted, the threaded end 109 is screwed into a driving lever, not shown in the drawing, while the screw head 110 abuts against the opposite outer surface of the round tube 101.

Instead of a screw 108 may also be a bolt or a be provided other pin-shaped connecting element, which is connected to the respective driving lever.

In Fig. 11 is a similar embodiment as in Fig. 10 shown. In this case, however, the inner sides of the round tube 101 are combined with reinforcing elements 110, through which the screw 108 or another pin-shaped fastening element engages.

In FIGS. 12 and 13 is again a similar embodiment as in 10 and 11 However, in this case, the transverse hole 107 is provided on both sides with inwardly curved edges 112. These edges 112 provide additional stability. Through the transverse hole 107, a bolt 113 is inserted, which is welded from both sides into the transverse hole 107. The inwardly directed edges 112 thereby assist the welding process, since they form an additional accumulation of material, in particular in the section according to FIG Fig. 13 can be seen.

In the embodiment according to FIGS. 14 and 15 the round tube 101 is locally flattened or oval compressed in the region of the fastening point 116 of the driving lever 104, and in the flattened or compressed region 114 is as well as in the Fig. 10 to 13 illustrated embodiments, a transverse hole 107 is provided, through which engages a screw, not shown in the drawing or a bolt. The screw or the bolt can be screwed or welded into the transverse hole 107.

How out FIGS. 14 and 15 As can be seen, a sleeve 115 is inserted into the transverse hole 107 and welded in the transverse hole 107, whereby an additional reinforcement is achieved. As already described, a screw or a bolt is then guided through the sleeve 115 and connected to a driver lever (not illustrated in the drawing).

In Fig. 16 a further embodiment of a designed as a round tube 101 pivot shaft is shown, wherein in the region of the attachment point 116, the pivot shaft forming round tube 101 is pressed square. This geometric shape already creates an additional reinforcement effect.

According to a further embodiment of the invention, an insert is inserted into the region of the fastening point 116 before it is pressed in a quadrangular manner, around which the fastening point is pressed around in a quadrangular manner.

The insert may be formed, for example, as a piece of pipe, which is positively inserted into the round tube 101. The round tube 101 is then pressed together with the inserted pipe section square, so that the in Fig. 16 shown outer shape arises. After pressing by means of a 4-jaw crimping tool, the round tube 101 is then in its mounting region 116 of a thick-walled four-edge unit, which forms a good fit for the attachment of a driving lever.

In the FIGS. 17 to 19 three further embodiments of an insert are shown.

According to Fig. 17 the insert 117 is formed as a square tube, which is inserted into the round tube 101 and the mounting portion 116 is then pressed square shape around the square tube.

According to Fig. 18 For example, the insert may be formed as a solid square block 118 which is inserted prior to pressing the round tube 101. Thereafter, the pressing is done to the four-edge unit.

According to Fig. 19 the square block 119 is provided with a transverse hole 120, which with a provided in the round tube, before or after the pressing to be mounted transverse hole flees. By passing through both parts transverse hole then a screw or a bolt can be inserted, which is connected to a driving lever.

In all embodiments according to Fig. 16 to 19 the pressing can take place over the entire length of the insert. For longer inserts, the compression can also be done in sections, whereby the same positive effect is achieved.

In the area of the reinforced fastening point 116 of the pivot shaft, the shaft can be grasped or also penetrated for fastening the entrainment lever. The FIGS. 20 and 21 show exemplary embodiments. In the embodiment according to FIG. 20 The round profile 101 is encompassed by a square holding tube 121, which is welded to the round profile. In this embodiment, the holding tube 121 is used as such as a driving lever, which has the pivot shaft or the round profile 101 radially outwardly extending portions which serve to provide a positive connection with the driven element, not shown.

FIG. 21 shows a further embodiment, wherein the holding tube 122 is formed as a round tube, which includes a teilumfängliche recess 123 to increase the weld, so that the holding part at both its end faces, as well as at the edge of this recess to the tube profile 101 is weldable. In the in FIG. 21 specified embodiment, a radially extending to the pivot shaft pin 124 is welded to the support tube 122 to provide a positive connection with the output elements of the furniture drive according to the invention, not shown.

Alternatively, it is also possible to combine these two attachment methods together.

It is crucial in all the illustrated embodiments that a local form fit between the round tube 101 and to be attached to this driving lever is achieved. All embodiments guarantee a positive connection between the pivot shaft formed as a round tube 101 and the driving lever attached thereto, so that the forces exerted by the adjusting drive on the driver are reliably absorbed and introduced into the pivot shaft.

LIST OF REFERENCE NUMBERS

1

drive

2

spindle

3

spindle nut

4

motor drive

5

pusher

6

output element

7

transmission shaft

8th

casing

51

Rod-like elements

52

breakthroughs

53

driving section

61

teeth

62

execution

63

Circular projections

71

takeaway

72

pen

101

Round profile, round tube

102

bolt

103

bag

104

Transmission lever

105

Toothed bolt

106

Outer toothing

107

transverse hole

108

screw

109

threaded end

110

screw head

111

reinforcing elements

112

Inwardly curved edges

113

bolt

114

Flattened or compressed area

115

shell

116

fastening point

117

Insert / square tube

118

Insert / massive square block

119

Insert / massive square block

120

transverse hole

121

Square holding tube

122

Round holding ear

123

Partial recess

124

spigot

Claims (14)

1. Drive for adjusting parts of furniture that can be moved relative to one another, in particular of armchairs, the drive (1) comprising a housing (8) in which an arrangement is placed that comprises a slider (5) linearly displaceable in a longitudinal direction and an output element (6) connected with the slider (5) by an operative connection, wherein the arrangement is designed to cause a rotation of the output element (6) around an axis of rotation during a linear displacement of the slider (5) in the longitudinal direction, the operative connection comprises an interlocking toothing between the slider (5) and the output element (6), wherein the output element (6) extends with an output section in a transverse direction above the interlocking toothing and wherein the interlocking toothing is provided at a lower end section of the slider (5) in the transverse direction, characterized in that at least one arcuate groove is placed laterally on the output element (6) to ensure a guiding of the output element in the housing (8) during the rotation, the groove engaging into an arcuate projection that is provided on the housing (8) and/or at least one arcuate projection (63) that engages into a arcuate groove that is provided on the housing is provided laterally on the output element (6).
2. Drive according to claim 1, characterized in that several first toothing elements are placed on the output element (6) and that several second toothing elements that are spaced from each other in the longitudinal direction are placed on the lower end section of the slider (5), wherein at least one of the first toothing elements engages into at least one of the second toothing elements for providing the operative connection.
3. Drive according to claim 2, characterized in that the first toothing elements are placed in an arcuate arrangement and that in particular the second toothing elements are placed in a linear arrangement.
4. Drive according to one of the claims 2 or 3, characterized in that the first toothing elements are designed as projections and the second toothing elements as recesses that are appropriate for receiving the projections or that the second toothing elements are designed as projections and the first toothing elements as recesses that are appropriate for receiving the projections.
5. Drive according to one of the claims 2 to 4, characterized in that the slider has a drive section (53), wherein the second toothing elements are placed along the direction of the axis of rotation laterally on the drive section (53).
6. Drive according to claim 5, characterized in that the second toothing elements are designed as bar-shaped elements (51) that protrude laterally from the drive section (53).
7. Drive according to one of the claims 5 or 6, characterized in that a first group of second toothing elements is placed on a first side of the drive section (53) and a second group of second toothing elements is placed on a second side of the drive section (53), wherein the output element (6) has a first toothing portion with a first group of the first toothing elements and a second toothing portion with a second group of the first toothing elements, wherein the drive section (53) is placed between the two toothing portions and wherein the first group of the first toothing elements cooperates with the first group of the second toothing elements and wherein the second group of the first toothing elements cooperates with the second group of the second toothing elements.
8. Drive according to claim 7, characterized in that the toothing portions overlap with the drive section (53) in the transverse direction for providing a guideway for the drive portion (53).
9. Drive according to one of the claims 2 or 4, characterized in that the slider (5) has a transmitting section that is designed in the manner of a perforated rail, wherein the output element (6) has a corresponding transmitting section that is designed in the manner of a toothed wheel, wherein in particular the transmitting section of the slider (5) is designed in the manner of a U-profile in which the corresponding transmitting section of the output element (6) is guided.
10. Drive according to one of the preceding elements, characterized in that the output element (6) has a passage (62) that extends along the axis of rotation with a cross-section for receiving a transmission shaft (7) with a corresponding cross-section.
11. Drive according to claim 10, characterized in that the cross-section of the passage (62) has a section with two sides parallel to each other and/or is designed at least in sections as a polygon, in particular as a square or a rectangle or a trapezoid.
12. Drive according to claim 10 or 11, characterized in that the transmission shaft (7) is designed in the manner of a tube or of a bar with a round cross-section on which a driver (71) is fixed in a fixed position, in particular is welded, riveted or screwed thereon, wherein the cross-section of the passage (62) corresponds with the common cross-section of the tube and the driver (71) or of the bar and the driver (71).
13. Drive according to one of the claims 10 to 12, characterized in that the passage (62) has an opening at its upper end in the transverse direction for ensuring the introduction of the transmission shaft (7) into the passage (62) perpendicularly to the axis of rotation, wherein a driver element that extends perpendicularly to the axis of rotation is placed in particular in a section along the axis of rotation in the passage (62), wherein the driver element is placed relative to the opening in such a manner that the driver element can engage with a corresponding driver element of the transmission shaft while introducing the transmission shaft into the passage.
14. Piece of furniture comprising at least two furniture parts that can be moved relative to one another as well as a drive according to one of the preceding claims, characterized in that the housing (8) of the drive (1) is in a fixed position with a first furniture part and that the output element (6) of the drive (1) is connected in a fixed position with a second furniture part, wherein a relative movement of the two furniture parts relative to one another can be carried out by the drive (1).

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