PatentDe  


Dokumentenidentifikation EP1401304 19.04.2007
EP-Veröffentlichungsnummer 0001401304
Titel ANTRIEBSEINHEIT, VORZUGSWEISE FÜR HUBSÄULEN FÜR HÖHENVERSTELLBARE TISCHE, UND HUBSÄULE
Anmelder Linak A/S, Nordborg, DK
Erfinder NIELSEN, Jens Jorgen, DK-6310 Broager, DK
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60218670
Vertragsstaaten AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, IE, IT, LI, LU, MC, NL, PT, SE, SK, TR
Sprache des Dokument EN
EP-Anmeldetag 04.07.2002
EP-Aktenzeichen 027824325
WO-Anmeldetag 04.07.2002
PCT-Aktenzeichen PCT/DK02/00467
WO-Veröffentlichungsnummer 2003003876
WO-Veröffentlichungsdatum 16.01.2003
EP-Offenlegungsdatum 31.03.2004
EP date of grant 07.03.2007
Veröffentlichungstag im Patentblatt 19.04.2007
IPC-Hauptklasse A47B 9/12(2006.01)A, F, I, 20051017, B, H, EP
IPC-Nebenklasse A47B 9/20(2006.01)A, L, I, 20051017, B, H, EP   

Beschreibung[en]

The present invention relates to a drive device, preferably for lifting columns for height-adjustable tables, and comprising an endless chain running over first and second chain wheels with a first chain run and a second chain run between the two chain wheels, wherein at least one chain run via a rod is connected with a movable element in the structure in which the drive device is to be incorporated. The invention moreover relates to a lifting column.

The disclosure of the invention is based on lifting columns having three mutually telescopically slidable members for height-adjustable tables.

SE 513 249, MPI Teknik AB, discloses a lifting column having three members whose movement is based on an endless chain in a closed tubular profile. Two rods protruding from the respective ends of the tubular profile are secured to the chain. The two rods are secured to the outer member and the inner member, respectively, of the column, while the closed tubular profile with the chain is secured in the central member. The telescopic movement of the column is caused by a linear actuator, which is secured with its one end to a base plate in the outer member and to the top of the tubular profile with the chain. The structure performs well as far as it goes, but it requires a column of a considerable cross-section to accommodate the actuator and the tubular member with the chain arranged side by side. In addition, the movement of the column is limited to the length of stroke of the actuator. If a great travel is desired in the column, it requires an actuator having a great length of stroke, but then the mounting height of the column becomes large, as the length of stroke of the actuator is directly related to its length - great length of stroke, long actuator. The structure is not particularly easy to mount either, just as the course of force is not optimum, resulting in inexpedient moment loads.

The object of the invention is to obviate the problems outlined above.

This is achieved according to the invention by a drive device of the type stated in the opening paragraph, configured as a stick-shaped element, wherein the chain wheels are mounted at respective ends, and wherein the one chain wheel is driven by an electric motor via a transmission, and wherein both the electric motor and the transmission are likewise mounted on the stick-shaped element such that the drive device essentially appears as a finished, mountable unit. The length of stroke is determined solely by the selection of the length of the drive device and is not tied to the length of stroke of an actuator, just as the drive device may be configured for a slender column profile and be made easy to mount.

The stick-shaped element may be made in two halves which may be assembled about a longitudinal plane, recesses being provided in two parts for various elements. In another embodiment, the stick-shaped element is an entity in which recesses are provided in an area up to the motor for the transmission or a part thereof as well as for the one chain wheel, which recesses may preferably be closed by a cover shield. The stick-shaped element may be moulded of plastics as well as of metal.

In an embodiment, at least the chain wheel most remote from the motor is mounted on a subelement of the stick-shaped element and is secured to it longitudinally slidably. This involves mounting advantages when mounting the chain, and it also allows an accurate chain tightening, just as it may be subsequently adjusted.

In an embodiment, the transmission is based on a planetary gear having a toothed rim with an internal toothing in engagement with a planet wheel, which is in turn in engagement with a sun wheel, said toothed rim being configured as the one chain wheel. This gives an extremely compact structure as well as a great gearing. The planetary gear has the additional advantage that it is relatively easy to integrate in the stick-shaped element. Expediently, the transmission further comprises a worm drive, where the motor shaft is formed with the worm. This is also relatively easy to arrange in the stick-shaped element. With a transmission consisting of a worm drive and, a planetary gear it is possible to achieve a great gearing, which is expedient when using motors having a large number of revolutions.

In an embodiment, the worm drive and the planetary gear are connected with a chain drive, wherein the worm wheel is connected with a first chain wheel and the sun wheel with a second chain wheel. The chain drive is flat and may therefore also be incorporated relatively easily in the stick-shaped element at the side of the planetary gear and the worm drive.

A specially constructed chain tightener for the chain drive comprises at least a spring-loaded block, one end of the block being intended for engagement with the chain, the other end having a snap locking part intended for cooperation with a boss for retention of the block against the spring action. When the chain is mounted, the snap lock is released and the block is engaged with the chain by the spring force to tighten it. This is simple and allows easy mounting. Expediently, there is a chain tightener for each chain run, preferably arranged inwardly of the chain, thereby allowing the same boss to be used for holding the blocks.

In an embodiment, the electrical wire(s) is typically a wire having several conductors to the drive unit connected with the one rod. This ensures that the wire does not get jammed in operation. To guide the wire additionally, the stick-shaped element may be formed with a cavity on the side for receiving the length of the wire in excess at any time, depending on the extended position of the drive unit.

In an embodiment, the end stop positions are determined by two end stop switches, preferably mounted on a common printed circuit board which may be inserted into a slot in the rod. The rods may be utilized for activating the end stop switches, e.g. in that the rods are provided with means or constructed themselves for activation of the end stop switches. It will be appreciated that the chain may also be used for activation of the end stop switches, but the rods are preferred since they are free or essentially free of grease and their length is well-defined, whereas the chain may be stretched.

In an expedient embodiment, the rods have a U-shaped cross-section which, with the sides, extends down around the chain. This provides a good control of the rods particularly during mounting, and the U-shape simultaneously gives a good strength and rigidity.

The side of one of the rods may be formed with a longitudinal incision for the function key of the end stop switches so that in the positions between the end stops the function keys protrude into the incision, while at the end stops the side of the rail will activate the respective end stop switch, which is a simple, safe and distinct way of activating the end stop switches.

In an embodiment, a guide for the respective rod is arranged on each end of the stick-shaped element, which has advantages in terms of mounting and transport, but it is also an advantage in terms of strength since the guide prevents the rods from deflecting, as they are subjected to column loads. The rods may additionally be guided laterally by a flange on the stick-shaped element which extends into the cavity of the U-shaped rods. The rods are expediently riveted to a U-shaped link of the chain, which is simple and inexpensive.

For attachment in the structure in which the drive device is to be incorporated, the outer end of the rods may be formed with flaps which are inserted into corresponding slots and are bent or twisted. With U-shaped rods, the two sides or the back may form the basis for the provision of flaps.

A simple mounting of the motor on the stick-shaped element is achieved by a dovetail connection, said motor being preferably provided with a front cover formed with a dovetail groove and a counterpart in the stick-shaped element.

In an embodiment, at least one end of the stick-shaped element is provided with at least a boss on each side as a lateral guide in the structure in which the drive device is to be incorporated. It is evident that the structure in which the drive unit is to be incorporated may be formed with corresponding means for fixing the drive unit.

The drive device may also be provided with a rotary potentiometer for absolute positional determination of the extended position of the drive device, said potentiometer being preferably arranged in a recess in the stick-shaped element and drawn via a toothed wheel on its shaft and in engagement with the drive chain, which is simple and functional. It will be appreciated, however, that other solutions may be used, such as optical and magnetic encoders, Hall sensors, etc.

As stated initially, the invention also relates to a lifting column having at least two, preferably three mutually telescopically slidable members equipped with a drive device as stated in claims 1-21. The lifting column may be configured as a table leg for height-adjustable tables. It will be appreciated that the drive device may also be used as a linear actuator.

Additional features of the invention appear from the claims and the subsequent description of an embodiment of the invention.

The invention will be explained more fully below with reference to the accompanying drawing. In the drawing:

Fig. 1
shows a lifting column having three members,
fig. 2
shows a drive device for a lifting column,
fig. 3
shows a longitudinal section A-A through the column,
fig. 4
shows a longitudinal section B-B through the column,
fig. 5
shows a cross-section D-D in the column, and
fig. 6
shows a cross-section E-E in the column,
fig. 7
shows a modified embodiment of the drive device, seen from one side,
fig. 8
shows the same as fig. 7, seen from the other side, and
fig. 9
shows the drive device in an extended position.

The column shown in the drawing consists of three members, viz. an outer profile 1, an intermediate profile 2 and an inner profile 3.

A drive device 4 is mounted in the intermediate profile 2, as indicated in fig. 2. This drive device is based on a stick-shaped element 5 consisting of two plastics shells 5a, 5b.

A DC motor 6 is secured to one end of the stick-shaped element 5, with an extension of the motor shaft constructed as a worm 7. The stick-shaped element mounts a shaft with a worm wheel 8 driven by the worm. A screw spring 9 is mounted on a cylindrical part of the worm wheel, said screw spring serving as a load moment barrier, cf. WO 98/30816, Linak A/S, see the spring and coupling parts positions 20-22 in the document.

A toothed wheel 10 for a drive chain 24 (shown in fig. 7), which drives a planetary gear 11, is mounted on the same shaft as the worm wheel.

The planetary gear 11 with its sun wheel 12, planet wheel 13 and internally toothed rim 14 is mounted in the stick-shaped element 5, i.e. the stick-shaped element is locally formed as a housing for the planetary gear. A chain wheel 15 for the drive chain is mounted on the shaft of the sun wheel 12. The stick-shaped element is constructed such that the toothed rim slides on the plastics, so that the planet wheel just transfers moments and not lateral forces. The sun wheel is sintered and merges into a spline. The transition between the toothing and the spline is stepped in an inclined shoulder, there being inwardly provided a bushing which in turn carries a bearing. The use of the bushing allows the spline.

The toothed rim 14 is externally constructed as a chain wheel 16. It may be configured as a unit, e.g. in sintered metal, or joined as two independent units. A chain wheel 17 of a dimension similar to the chain wheel 16 is mounted at the other end of the stick-shaped element 5. A chain 31 (shown in figs. 7 and 8) runs around these two chain wheels 16, 17 and forms two parallel chain runs between the two chain wheels.

A rod 18 is mounted with its one end on the one chain run at the chain wheel 16, the other end of said rod being secured to the outer profile 1 via an end plate 20. A corresponding rod 21 is mounted on the other chain run at the chain wheel 17, but extends in the opposite direction and is secured with the other end to the inner profile 3 via an end plate 22.

When the motor is activated, the two rods 18, 21, because of the movement of the chain, will extend the outer profile 1 and the inner profile 3, respectively, synchronously relative to the intermediate profile 2, and correspondingly retract them when the rotation of the motor is reversed.

The chain wheel 17 is mounted on a separate subelement 23 of the stick-shaped element. This subelement has a stem 23a, whereby it is received in a cavity at the end of the stick-shaped element. The end of the stem is inclined and cooperates with a wedge at the bottom of the cavity. The wedge may be adjusted to and fro by a screw for longitudinal displacement of the element 23 and thereby adjustment of the tightening of the chain.

With the transmission sequence: worm drive 7, 8, chain drive 10, 15 and planetary gear 11 as well as toothed wheel 16 externally on the toothed rim 14 of the planetary gear, a great reduction in the transmission is achieved. It is a further advantage that the gearing may easily be adjusted for current needs by changing the chain wheels 10, 15 of the chain drive.

The column has a relatively short mounting height as the motor is arranged in the area of the necessary overlap between the inner profile 3 and the intermediate profile 2. The specially constructed planetary gear 11 also contributes to reducing the mounting dimension.

As will appear, the mounting of the drive device is simple, as the various parts are mounted in one half of the stick-shaped element 5 and are subsequently closed by the other half, and finally the chain is tightened. The drive device is hereby ready for mounting in a column.

Fig. 7 of the drawing shows a modified embodiment of the drive device, in which the same reference numerals are used as in the foregoing. In the modified embodiment, the stick-shaped element 5 is formed by a single element, and the housing for the planetary gear 11 and the other parts mounted in the stick-shaped element is formed by a space, which is subsequently closed by a cover 25. Provision has also been made for the mounting of a rotary potentiometer 26, if it is desired to have an absolute positional determination of the extended position of the drive device. The potentiometer is driven via a toothed wheel on the shaft 27 and is in engagement with the drive chain 24. Of course, other forms of positional determinations may be used, e.g. Hall sensors.

The end stop positions may be determined by two end stop switches 28, 29 mounted on a printed circuit board 30 which is inserted into a slot in the rod. The rods 18, 21 have a U-shaped cross-section which, with the sides, extends down around the chain 31. The side of the rod 21 is formed with a longitudinal incision for the keys of the end stop switches 28, 29. In the positions between the end stops the keys extend into the incision, but at the end stops the side of the rail will activate the respective end stop switch. Alternatively, the inner side of the rail might be equipped with a member for activation of the end stop switches.

Wring for the motor and the end stop switches is introduced at the top of the column. It is typically a wire having at least four or five conductors. Since the motor and the end stop switches are positioned in the central member, the wire must have a freely movable excess length at least corresponding to the distance which the inner member may be extended. To avoid damage to the wire or the structure, the wire is secured to the rod 21 by means of wire holders 32. The wire is run with a curve into a chamber 33 in the stick-shaped element. This chamber is formed between the side of the stick-shaped element and a cover 34 and is open toward the rod 21 along the entire longitudinal side. In the retracted state, the wire extends from the cable holder 32' in a curve into the chamber at 33 and extends at the internal longitudinal side in the chamber up to the motor and the printed circuit board with the end stop switches. When the drive device is extended, the wire will be pulled along out through the side of the chamber 33. The wire is thereby controlled so that it is not damaged or does not cause operational disturbances by getting caught in the drive device or the column.

The outer end of the stick-shaped element has a guide 35 for the rod 18, and for the rod 21 there is a guide 36 which merely keeps the rod against the drive device. The rod 21 is guided in the lateral direction by a flange 37 on the stick-shaped element.

A special chain tightener is provided to prevent noise from the drive chain 24. The chain tightener comprises two blocks 38, where one end is intended for engagement with the chain, while the other end has a fin-shaped snap locking part intended for insertion into a slot in an upright boss 39. Only one block is shown in the drawing. The blocks are spring-loaded by a small spring for engagement with the chain. Prior to mounting, the two blocks are kept back on the boss 39. When the drive chain is mounted, the blocks are released for engagement with it. This facilitates the mounting and also ensures that the chain makes no noise.

The rods 18, 21 are riveted on a U-shaped link of the chain 31 and are secured with the other end to the inner member and the outer member, respectively, of the column by means of a pair of flaps 40. The flaps are inserted through a hole in an end plate in the members and are twisted about the longitudinal axis for attachment.

It is observed that the motor is secured to the stick-shaped element by a dovetail connection, said motor being provided with a front cover formed with a dovetail grove and a counterpart in the stick-shaped element, which is a simple configuration easy to mount.

For lateral guiding and positioning, the lower end of the stick-shaped element is provided with a boss 41 on each side which is supported against the inner side of the central profile when the drive device is inserted into it.

The term lifting column has been used in the foregoing, but it will be appreciated that the invention also covers linear actuators. A lifting column is fundamentally a linear actuator arranged vertically.


Anspruch[de]
Antriebseinrichtung, vorzugsweise für Hubsäulen für höhenverstellbare Tische, umfassend eine über erste und zweite Kettenräder (16, 17) laufende endlose Kette (31) mit einem ersten Kettentrum und einem zweiten Kettentrum zwischen den zwei Kettenrädern, wobei wenigstens ein Kettentrum über eine Stange (18, 21) mit einem bewegbaren Element in der Struktur, in der die Antriebseinrichtung aufgenommen werden soll, verbunden ist, dadurch gekennzeichnet, dass sie ein stabförmiges Element (5) umfasst, an dessen jeweiligen Enden die Kettenräder angebracht sind, von denen das eine Kettenrad (16) von einem Elektromotor (6) über eine Transmission (7, 8; 10, 15, 24; 12, 13, 14) angetrieben ist, wobei der Elektromotor ebenso wie die Transmission gleichermaßen an dem stabförmigen Element angebracht sind derart, dass die Antriebseinrichtung im Wesentlichen als fertige, montierbare Einheit in Erscheinung tritt. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass das stabförmige Element (5) von zwei Hälften gebildet ist, die um eine Längsebene zusammensetzbar sind. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass in einem Bereich bis zum Motor (6) hin das stabförmige Element (5) mit einer Ausnehmung für die Transmission oder einen Teil (7, 8; 10, 15, 24) davon ebenso wie für das eine Kettenrad (16) ausgebildet ist, wobei diese Ausnehmung vorzugsweise mittels eines Abdeckschirms (25) verschließbar ist. Antriebseinrichtung nach Anspruch 1 oder 3, dadurch gekennzeichnet, dass wenigstens das vom Motor (6) entfernteste Kettenrad (17) auf einem Teilelement (23, 23a) des stabförmigen Elements (5) angebracht und in Längsrichtung gleitfähig zum Spannen der Kette (31) befestigt ist. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Transmission ein Planetengetriebe mit einem Zahnkranz (14) mit einer Innenverzahnung umfasst, die im Eingriff mit einem Planetenrad (13) steht, das seinerseits im Eingriff mit einem Sonnenrad (12) steht, wobei der Zahnkranz (14) außen als das eine Kettenrad (16) ausgebildet ist. Antriebseinrichtung nach Anspruch 5, dadurch gekennzeichnet, dass das stabförmige Element (5) örtlich als ein Gehäuse für das Planetengetriebe (12, 13, 14) ausgebildet ist. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Transmission zusätzlich einen Schneckenantrieb (7, 8) umfasst, wobei die Motorwelle mit der Schnecke gebildet ist. Antriebseinrichtung nach Ansprüchen 5 und 7, dadurch gekennzeichnet, dass der Schneckentrieb (7, 8) und das Planetengetriebe (12 -14) mit einem Kettentrieb (10, 15, 24) verbunden sind, wobei das Schneckenrad (8) mit einem ersten Kettenrad (10) und das Sonnenrad (12) mit einem zweiten Kettenrad (15) verbunden sind. Antriebseinrichtung nach Anspruch 8, dadurch gekennzeichnet, dass sie einen Kettenspanner mit wenigstens einem federbeaufschlagten Block (38) umfasst, dessen eines Ende zum Eingriff mit der Kette vorgesehen ist und dessen anderes Ende ein Schnappverriegelungsteil aufweist, das zum Zusammenwirken mit einem Ansatz (39) bestimmt ist, um den Block gegen Federwirkung zurückzuhalten, wobei der Block beaufschlagt ist, mit der Kette unter Federkraft in Eingriff zu treten, wenn das Schnappverriegelungsteil gelöst wird. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass ein elektrischer Draht, der zu der Antriebseinheit hin / von dieser weg führt, mit einer der Stangen (21) verbunden ist. Antriebseinrichtung nach Anspruch 1 oder 8, dadurch gekennzeichnet, dass das stabförmige Element einen Hohlraum (33) zum Aufnehmen der Länge überschüssigen Drahts zu jeder Zeit abhängig von der ausgefahrenen Position der Antriebseinheit aufweist. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass Endlagestellungen durch zwei Endstoppschalter (28, 29) bestimmt sind, die vorzugsweise auf einer gemeinsamen gedruckten Schalttafel (30) angebracht sind, die in einen Schlitz in dem stabförmigen Element einfügbar ist. Antriebseinrichtung nach Ansprüchen 1 und 12, dadurch gekennzeichnet, dass die Stange oder Stangen (18, 21) zum Aktivieren der Endstoppschalter (28, 29) mit Mitteln dazu versehen oder selbst dafür ausgebildet sind. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Stange oder Stangen (18, 21) U-förmigen Querschnitt aufweisen, der sich mit seinen Seiten entlang der Seiten der Kette (31) erstreckt. Antriebseinrichtung nach Anspruch 14, dadurch gekennzeichnet, dass die Seite der Stange (21) mit einem Längseinschnitt für den Funktionsschlüssel der Endstoppschalter (28, 29) ausgebildet ist, sodass sich die Funktionsschalter in den Positionen zwischen den Endstopps in den Einschnitt erstrecken, während an den Endstopps die Seite der Stange den jeweiligen Endstoppschalter aktiviert. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass an jedem Ende des stabförmigen Elements eine Führung (35, 36) für die jeweilige Stange (18. 21) vorgesehen ist. Antriebseinrichtung nach Ansprüchen 14 und 16, dadurch gekennzeichnet, dass die Stange (21) in seitlicher Richtung durch einen Flansch (37) an dem stabförmigen Element geführt ist. Antriebseinrichtung nach Anspruch 1 oder 14, dadurch gekennzeichnet, dass die Stange oder Stangen (18, 21) an ein U-förmiges Verbindungselement der Kette (31) angenietet sind. Antriebseinrichtung nach Anspruch 1 oder 14, dadurch gekennzeichnet, dass das äußere Ende der Stange oder Stangen zur Befestigung in der Struktur, in der die Antriebseinrichtung aufzunehmen ist, mit Lappen (40) ausgebildet ist. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Motor an dem stabförmigen Element mit einer Schwalbenschwanzverbindung befestigt ist, wobei der Motor vorzugsweise mit einer Frontabdeckung versehen ist, die mit einer Schwalbenschwanznut und einem Gegenstück in dem stabförmigen Element ausgebildet ist. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass wenigstens ein Ende des stabförmigen Elements auf jeder Seite mit wenigstens einem Ansatz (41) als seitliche Führung in der Struktur versehen ist, in der die Antriebseinrichtung aufzunehmen ist. Antriebseinrichtung nach Anspruch 1, dadurch gekennzeichnet, dass sie ein Drehpotentiometer (26) zur absoluten Lagebestimmung der ausgefahrenen Position der Antriebseinrichtung umfasst, wobei das Potentiometer vorzugsweise in einer Ausnehmung in dem stabförmigen Element angeordnet und über ein Zahnrad auf einer Welle (27) und im Eingriff mit der Antriebskette (24) angetrieben ist. Hubsäule mit mindestens zwei, vorzugsweise drei gemeinsam teleskopisch gleitförmigen Teilen, die mit einer Antriebseinrichtung, wie sie in den Ansprüchen 1 - 21 definiert ist, ausgestattet ist. Hubsäule nach Anspruch 23, ausgebildet als Tischbein für höhenverstellbare Tische.
Anspruch[en]
A drive device, preferably for lifting columns for height-adjustable tables, comprising an endless chain (31) running over first and second chain wheels (16, 17) with a first chain run and a second chain run between the two chain wheels, wherein at least one chain run via a rod (18, 21) is connected with a movable element in the structure in which the drive device is to be incorporated, characterized in that it comprises a stick-shaped element (5), said chain wheels being mounted at respective ends thereof, the one chain wheel (16) being driven by an electric motor (6) via a transmission (7, 8; 10, 15, 24; 12, 13, 14), said electric motor as well as said transmission being likewise mounted on the stick-shaped element such that the drive device essentially appears as a finished, mountable unit. A drive device according to claim 1, characterized in that the stick-shaped element (5) is formed by two halves which may be assembled about a longitudinal plane. A drive device according to claim 1, characterized in that, in an area up to the motor (6), the stick-shaped element (5) is formed with a recess for the transmission or a part (7, 8; 10, 15, 24) thereof as well as for the one chain wheel (16), which recess may preferably be closed by a cover shield (25). A drive device according to claim 1 or 3, characterized in that at least the chain wheel (17) most remote from the motor (6) is mounted on a subelement (23, 23a) of the stick-shaped element (5) and is secured longitudinally slidably for tightening the chain (31). A drive device according to claim 1, characterized in that the transmission comprises a planetary gear having a toothed rim (14) with an internal toothing in engagement with a planet wheel (13), which is in turn in engagement with a sun wheel (12), said toothed rim (14) being externally configured as the one chain wheel (16). A drive device according to claim 5, characterized in that the stick-shaped element (5) is locally configured as a housing for the planetary gear (12, 13, 14). A drive device according to claim 1, characterized in that the transmission additionally comprises a worm drive (7, 8), wherein the motor shaft is formed with the worm. A drive device according to claims 5 and 7, characterized in that the worm drive (7, 8) and the planetary gear (12-14) are connected with a chain drive (10, 15, 24), said worm wheel (8) being connected with a first chain wheel (10) and the sun wheel (12) with a second chain wheel (15). A drive device according to claim 8, characterized in that it comprises a chain tightener having at least one spring-loaded block (38), one end of the block being intended for engagement with the chain, the other end having a snap locking part intended for cooperation with a boss (39) for retention of the block against spring action, said block being caused to engage the chain by the spring force when the snap locking part is released. A drive device according to claim 1, characterized in that an electrical wire(s) leading to/from the drive unit is connected to one of the rods (21). A drive device according to claim 1 or 8, characterized in that the stick-shaped element has a cavity (33) for receiving the length of the wire in excess at any time, depending on the extended position of the drive unit. A drive device according to claim 1, characterized in that end stop positions are determined by two end stop switches (28, 29), preferably mounted on a common printed circuit board (30) which may be inserted into a slot in the stick-shaped element. A drive device according to claims 1 and 12, characterized in that the rod or rods (18, 21) are provided with means or are constructed themselves for activation of the end stop switches (28, 29). A drive device according to claim 1, characterized in that the rod or rods (18, 21) have a U-shaped cross-section which, with the sides, extends along the sides of the chain (31). A drive device according to claim 14, characterized in that the side of the rod (21) is formed with a longitudinal incision for the function key of the end stop switches (28, 29), so that in the positions between the end stops the function keys extend into the incision, while at the end stops the side of the rod will activate the respective end stop switch. A drive device according to claim 1, characterized in that a guide (35, 36) is provided on each end of the stick-shaped element for the respective rod (18, 21). A drive device according to claims 14 and 16, characterized in that the rod (21) is guided in a lateral direction by a flange (37) on the stick-shaped element. A drive device according to claim 1 or 14, characterized in that the rod or rods (18, 21) are riveted on a U-shaped link of the chain (31). A drive device according to claim 1 or 14, characterized in that the outer end of the rod or rods is formed with flaps (40) for attachment in the structure in which the drive device is to be incorporated. A drive device according to claim 1, characterized in that the motor is secured to the stick-shaped element with a dovetail connection, said motor being preferably provided with a front cover formed with a dovetail groove and a counterpart in the stick-shaped element. A drive device according to claim 1, characterized in that at least one end of the stick-shaped element is provided with at least a boss (41) on each side as a lateral guide in the structure in which the drive device is to be incorporated. A drive device according to claim 1, characterized in that it comprises a rotary potentiometer (26) for absolute positional determination of the extended position of the drive device, said potentiometer being preferably arranged in a recess in the stick-shaped element and driven via a toothed wheel on a shaft (27) and in engagement with the drive chain (24). A lifting column having at least two, preferably three mutually telescopically slidable members equipped with a drive device as defined in claims 1-21. A lifting column according to claim 23, configured as a table leg for height-adjustable tables.
Anspruch[fr]
Dispositif d'entraînement, de préférence pour des colonnes de levage de tables réglables en hauteur, comprenant une chaîne sans fin (31) s'enroulant sur des première et seconde roues de chaîne (16, 17) avec un premier brin de la chaîne et un second brin de la chaîne entre les deux roues de chaîne, dans lequel au moins un brin de la chaîne via une barre (18, 21) est relié à un élément mobile dans la structure dans laquelle le dispositif d'entraînement doit être incorporé,

caractérisé en ce qu'il comprend un élément en forme de bras (5), lesdites roues de chaîne étant montées au niveau de ses extrémités respectives, la roue de chaîne étant entraînée par un moteur électrique (6) via une transmission (7,8 ;10,15,24 ;12,13,14), ledit moteur électrique ainsi que ladite transmission étant également montés sur l'élément en forme de bras de telle sorte que le dispositif d'entraînement apparaisse essentiellement en tant qu'une unité finie, pouvant être montée.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce que l'élément en forme de bras (5) est formé de deux moitiés qui peuvent être assemblées autour d'un plan longitudinal.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce que, dans une zone jusqu'au moteur (6), l'élément en forme de bras (5) est réalisé avec un évidement pour la transmission ou une partie (7,8 ;10,15,24) de celle-ci ainsi que pour la roue de chaîne (16), lequel évidement peut être de préférence fermé par un couvercle de protection (25).
Dispositif d'entraînement selon la revendication 1 ou 3,

caractérisé en ce qu'au moins la roue de chaîne (17) la plus éloignée du moteur (6) est montée sur un sous-élément (23, 23a) de l'élément en forme de bras (5) et est fixée longitudinalement de façon coulissante pour tendre la chaîne (31).
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce que la transmission comprend un engrenage planétaire ayant une couronne dentée (14) avec une denture interne en engagement avec un pignon satellite (13), qui est à son tour en engagement avec un planétaire (12), ladite couronne dentée (14) étant configurée extérieurement sous la forme de la roue à chaîne (16).
Dispositif d'entraînement selon la revendication 5,

caractérisé en ce que l'élément en forme de bras (5) est configuré localement sous la forme d'un boîtier pour l'engrenage planétaire (12, 13, 14).
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce que la transmission comprend de plus un entraînement à vis sans fin (7, 8), dans lequel l'arbre moteur est réalisé avec la vis sans fin.
Dispositif d'entraînement selon les revendications 5 et 7,

caractérisé en ce que l'entraînement à vis sans fin (7, 8) et l'engrenage planétaire (12-14) sont reliés à une transmission par chaîne (10, 15, 24), ladite roue à vis sans fin (8) étant reliée à une première roue de chaîne (10) et le planétaire (12) à une seconde roue de chaîne (15).
Dispositif d'entraînement selon la revendication 8,

caractérisé en ce qu'il comprend un tendeur de chaîne ayant au moins un coulisseau chargé par ressort (38), une extrémité du coulisseau étant destinée à l'engagement avec la chaîne, l'autre extrémité ayant une partie de blocage par encliquetage destinée à coopérer avec un bossage (39) pour le maintien du coulisseau contre l'action du ressort, ledit coulisseau étant entraîné à engager la chaîne par la force du ressort quand la partie de blocage par encliquetage est libérée.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce qu'un fil(s) électrique(s) conduisant à l'unité d'entraî-nement/provenant de celle-ci est relié à l'une des barres (21).
Dispositif d'entraînement selon la revendication 1 ou 8,

caractérisé en ce que l'élément en forme de bras présente une cavité (33) pour recevoir la longueur du fil en excès à tout moment, dépendant de la position d'extension de l'unité d'entraînement.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce que des positions de butée de fin de course sont déterminées par deux commutateurs de butée de fin de course (28, 29), de préférence montés sur une carte de circuit imprimé commune (30) qui peut être introduite dans une fente dans l'élément en forme de bras.
Dispositif d'entraînement selon les revendications 1 et 12,

caractérisé en ce que la barre ou les barres (18, 21) sont munies de moyens ou sont construites elles-mêmes pour actionner les commutateurs de butée de fin de course (28, 29).
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce que la barre ou les barres (18, 21) ont une coupe transversale en forme de U laquelle, avec les côtés, s'étend le long des côtés de la chaîne (31).
Dispositif d'entraînement selon la revendication 14,

caractérisé en ce que le côté du bras (21) est réalisé avec une incision longitudinale pour la touche de fonction des commutateurs de butée de fin de course (28, 29), de sorte que, dans les positions entre les butées de fin de course, les touches de fonction se trouvent dans l'incision, tandis qu'au niveau des butées de fin de course, le côté de la barre va actionner le commutateur de butée de fin de course respectif.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce qu'un guide (35, 36) est prévu sur chaque extrémité de l'élément en forme de bras pour la barre respective (18, 21).
Dispositif d'entraînement selon les revendications 14 et 16,

caractérisé en ce que la barre (21) est guidée dans une direction latérale par un rebord (37) sur l'élément en forme de bras.
Dispositif d'entraînement selon la revendication 1 ou 14,

caractérisé en ce que la barre ou les barres (18, 21) sont rivetées sur un maillon en forme de U de la chaîne (31).
Dispositif d'entraînement selon la revendication 1 ou 14,

caractérisé en ce que l'extrémité externe de la barre ou des barres est réalisée avec des pattes (40) pour la fixation dans la structure dans laquelle le dispositif d'entraînement doit être incorporé.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce que le moteur est fixé à l'élément en forme de bras avec une liaison en queue d'aronde, ledit moteur étant de préférence muni d'un couvercle avant réalisé avec une rainure en queue d'aronde et une contrepartie dans l'élément en forme de bras.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce qu'au moins une extrémité de l'élément en forme de bras est munie d'au moins un bossage (41) sur chaque côté en tant que guide latéral dans la structure dans laquelle le dispositif d'entraînement doit être incorporé.
Dispositif d'entraînement selon la revendication 1,

caractérisé en ce qu'il comprend un potentiomètre rotatif (26) pour la détermination parfaite de la position étendue du dispositif d'entraînement, ledit potentiomètre étant de préférence agencé dans un évidement dans l'élément en forme de bras et entraîné via une roue dentée sur un arbre (27) et en engagement avec la chaîne d'entraînement (24).
Colonne de levage ayant au moins deux, de préférence trois éléments mutuellement coulissants de façon télescopique, équipés d'un dispositif d'entraînement de la manière définie dans les revendications 1-21. Colonne de levage selon la revendication 23, configurée sous la forme d'un pied de table pour des tables réglables en hauteur.






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A Täglicher Lebensbedarf
B Arbeitsverfahren; Transportieren
C Chemie; Hüttenwesen
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G Physik
H Elektrotechnik

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