DE20302137U1 - Electric motor furniture driver has drive motor and spindle connected in a rail section housing - Google Patents

Abstract

An electric motor for furniture drive comprises a drive motor (11), a spindle (14) and a nut (15) in a housing having a rail section (17) connected to the motor so that the drive peg leads through the rail section or is outside it.

Description

Electromotive furniture drive

The present invention relates to an electromotive furniture drive with at least one drive gear motor and with at least one spindle onto which a spindle nut is placed and in which at least the spindle, for example the spindles and the spindle nut or the spindle nuts, is or are arranged in a housing.

The electric motor furniture drive in question can be designed as a single drive or as a double drive. The single drive is equipped with a drive gear motor, a spindle and a spindle nut, while the double drive is equipped with one or two drive gear motors, two spindles and two spindle nuts. The spindle nut is usually secured against rotation. As a result, each spindle nut moves back and forth in the longitudinal direction of the spindle depending on the direction of rotation of the spindle. However, designs are also known in which each drive element is designed as a rotating component with an internal threaded hole, so that in the operating state the drive itself is the spindle nut, since the entire drive moves back and forth on the spindle, which itself does not rotate.

LOESENBECK · STRACKE · SPECHT · DANTZ - PATENT ATTORNEYS * f U^QP ₁ EAN &bgr;&Agr;&Tgr;&bgr;&Ngr;&Tgr; AND TRADEMA«JC ATTORNEYS

······ Registration text from* 0.02.2*003 Page 2

The housings of the furniture drives in question are made of plastic. Manufacturing them using the injection molding process requires expensive tools, which account for a considerable part of the manufacturing costs of the electric motor furniture drive. Since the furniture drives are mass products that should be manufactured as inexpensively as possible, the tried and tested but expensive plastic housings are not ideal. In addition, plastics can only bear relatively low loads, so that complex reinforcing ribs or other reinforcing components are necessary. There is relatively little space available for installing the electric motor furniture drives, particularly in the armchair area, so that such furniture drives must be built compactly. It is therefore common, especially with double drives, for the drive motors to be installed in pots that protrude from the sides of the housing. Since these pots are part of the housing, the drive motors are therefore mounted inside the housing.

The invention is based on the object of designing an electric motor furniture drive of the type described in more detail above in such a way that the costs for manufacturing the housing are reduced, and that the forces occurring can be diverted without damaging the components and that assembly is also simplified.

The stated object is achieved according to a first proposal in that the housing has a continuous profile rail section and that the drive motor is positioned relative to the profile rail section in such a way that the output pin of the drive motor passes through the profile rail section or is located outside the profile rail section.

The use of a profile rail section as part of or instead of the housing offers many advantages. For example, it can be made from a highly resilient material that has the same strength even at elevated temperatures. Depending on the load, metallic or non-metallic materials can be used. In addition, such materials can be processed by cold forming. Furthermore, chipless processing, for example

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• * · * * * Registration text from 10.02.2003 Page 3

This can be done by punching. In addition, commercially available profile rails can be used, which are produced by the relevant manufacturers in large quantities and therefore inexpensively. The profile rail section is the load-bearing component of the electric motor furniture drive. Due to its cross-section, the profile rail section offers a high load-bearing capacity, so that damage to drive parts can be ruled out. If the cross-sections are selected accordingly, assembly is also simplified. Due to the stability of the profile rail section, it is possible to mount the spindle in the simplest way.

Another advantage is that all the forces can be diverted via the profile rail section if the electric motor furniture drive is designed accordingly. The output pin of the drive motor can either be guided through a hole or punch in the profile rail section, but it can also be located outside the profile rail section.

The type of construction used also depends on the intended use of the electric motor furniture drive. This allows an extremely compact design to be achieved, so that the electric motor furniture drive can also be installed in extremely small installation spaces. If the drive motor's output pin is outside the profile rail section, there is also the advantage that it is not weakened by the hole or the punching.

The task is solved according to a second proposal in that the housing has a continuous profile rail section and the drive motor is located within the profile rail section. The advantages achieved with the profile rail section are the same as those according to the first proposal. The arrangement of the drive motor within the profile rail results in an extremely compact design, so that the electromotive furniture drive can also be used when the installation spaces are relatively small, as is the case with armchairs, for example. The drive connection between the drive motor and the spindle can be formed in a variety of ways. The drive connection selected also depends on the design of the furniture. It is intended that this drive connection

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... ■ · · Registration text dated 10.02.2003 Page 4

connection with the spindle is formed by a gear unit which reduces the motor speed and whose axes cross, intersect or run parallel to the axis. If the force applied by a drive motor and a spindle is not sufficient, the furniture drive can also be equipped with at least two rotating spindles which are parallel and spaced apart from one another. Each spindle is then driven by a drive motor so that the force is increased in proportion to the number of spindles and drive motors. The spindles are expediently arranged vertically and longitudinally without offset from one another. It is also possible for each spindle to be mounted in its own profile rail section or for all spindles to be mounted in a common profile rail section.

In a particularly advantageous manner, a gear angle is inserted into the profile rail section, preferably without play, with the drive motor being fixed to this gear angle. The gear angle is designed like a block and has two surfaces at an angle to each other. The number of components is minimized and the electromotive furniture drive is thus still compact, even if the spindle is mounted in the gear angle by means of at least one, preferably one, roller bearing. However, the spindle is expediently mounted in two roller bearings, the arrangement being such that one roller bearing acts as a fixed bearing and the other roller bearing acts as a floating bearing. In a preferred embodiment, the output pin of the drive motor is arranged adjacent to a longitudinal edge of the profile rail section, with the gear angle protruding from the associated edge of the profile rail section and having an opening for the output pin of the drive motor or for the worm of a worm drive connected downstream of the motor. The worm can also be mounted on the output pin of the drive motor in a rotationally fixed manner or the output pin of the drive motor could be designed as a worm. The gear angle is advantageously formed from two angle halves, whereby the parting plane can run transversely to the longitudinal axis of the spindle or in the direction of the spindle, whereby in the latter embodiment it is offset from the central longitudinal axis of the spindle. In order to ensure that the gear angle is always in the correct position, the half of the angle facing the drive pin of the drive motor has a centering web on the side facing away from the parting plane. This

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Registration text from 10.02.2003

The centering web can be designed in such a way that it rests against the front face of the drive motor over a certain area. The respective cross-section of the profile rail section can be varied. In a first embodiment, the cross-section could be open. Each gear angle is then guided through this opening or through this longitudinal slot to the outside of the profile rail section. However, it is also possible for the cross-section of the profile rail section in its basic contour to consist of a closed profile section that is partially opened. The drive parts are then pushed or pulled into the profile rail section as a structural unit from the front side. However, if an open cross-section is used, the longitudinal slot could be closed off by a removable cover cap to protect the drive parts. This also has the advantage that the limit switches that limit the distortion of the spindle nut can be inserted into the cover cap. However, if a cross-section that is to be regarded as closed is selected, the drive motor can be flanged to any leg that is free of slots. All that is required is that this leg has an opening through which the output pin of the drive motor can be inserted. However, this hole should be large enough that the screw can also be inserted through.

It would then be sensible to slide a centering ring onto the output pin before the worm is placed on it. If the profile rail section is provided with a longitudinal slot, the drive gear motor is expediently flanged to the opposite leg for stability reasons. When using an open profile, i.e. one with a longitudinal slot, it is also conceivable that the drive motor is positioned with suitable fastening means in relation to the profile rail section in such a way that the worm is outside the profile rail section, so that an engagement section of the worm wheel is also outside the profile rail section. If the profile rail section is equipped with a longitudinal slot, the area over which the worm drive and the bearing blocks extend should be covered. Instead of a solid cover cap, however, a cover strip made of a flexible material could also be used. This would be, for example, a self-adhesive film or the like.

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&diams; Registration text from 10.02.2003 Page 6

In a further embodiment, it is also provided that at least one end of the profile rail section is designed as a suspension element. For this purpose, two parallel legs could be provided with aligned holes, while the leg connecting these two parallel legs is notched. At least one end could also be designed in the manner of a fork head if the end areas of two parallel legs are equipped with holes as suspension lugs. If it is a double drive, both end areas of the profile rail section would be designed as suspension elements. With a single drive, however, only one end of the profile rail section would be equipped with a suspension element. With such a single drive, the lifting tube firmly connected to the spindle nut could also be made of metal. The free end area could in turn be equipped with holes so that, for example, a suspension bolt or the like can be inserted into it. The limit switches are very easy to attach if they are attached to the limit switch bar on the profile rail section.

The profile rail section can be made from a wide variety of materials. However, it is preferably made from a metal, for example aluminum or steel. However, wood or a wood-like material or even a plastic can also be used. In the designs described above, the spindle was always driven in a rotating manner. However, it is also possible for the output-side member of the drive connection to be a rotating body that is provided with an internal threaded hole. In such a design, the spindle is secured against rotation so that it moves in its longitudinal direction depending on the direction of rotation of the rotating body. The linear movement could then be taken from the spindle. According to another design, however, it is also conceivable for the spindle to be held stationary, i.e. it can neither rotate nor move in its longitudinal direction. If a rolling element provided with an internal threaded hole forms the output member, the entire drive moves on the spindle when the drive is switched on. The drive would then form the drive element for the component to be adjusted. It is further provided that the drive motor is a drive gear motor and that the drive has at least one spindle, to which each

LOESENBECK · STRACKE · SPECHT · DANTZ - PATENT ATTORNEYS ^gUlföSEAN &Rgr;^&Tgr;&&Igr;&Tgr; AND JRADJMARK ATTORNEYS

Note dated 10.02.2003 Page 7

because or at least one spindle nut is placed on it. In such an arrangement, at least the spindle or the spindles and the spindle nut or the spindle nuts are arranged in a housing. Here too, the housing has a continuous profile rail section made of metal, preferably steel, with the drive motor being located on the profile rail section in such a way that the drive pin is guided through the profile rail section or is located outside of it.

The invention is explained in more detail with reference to the accompanying drawings.
Show it:

Figure 1

Figure 2

a furniture drive according to the invention in a sectional view,

the furniture drive according to Figure 1 in a perspective view,

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figures 8 to 10

another embodiment of the furniture drive according to the invention in an exploded view,

the furniture drive according to Figure 3 in a front view of the profile rail section in the expanded state,

a view corresponding to Figure 5, but in the assembled state,

the furniture drive according to Figures 3 to 5 in a perspective view,

a variant of the furniture drive according to Figure 6 and

different cross-sections of the profile rail section and different arrangements of the drive motor.

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* Registration text dated 10.02.2003 Page 8

The electromotive furniture drive 10 shown in Figures 1 to 10 is equipped with a drive motor 11, on whose output pin a worm 12 is mounted in a rotationally fixed manner, which engages with a worm wheel 13. The output pin of the drive motor 11 could also be designed as a worm. The worm wheel 13 is mounted in a rotationally fixed manner on a spindle 14, or the spindle 14 and the worm wheel 13 could form a one-piece component. A spindle nut 15 is mounted on the spindle 14, which is secured against rotation so that it moves in the longitudinal direction of the spindle 14 when the spindle 14 rotates. The spindle nut 15 carries a lifting tube 16, which can be connected directly or indirectly to a furniture component to be adjusted. The housing of the electromotive furniture drive 10 contains a profile rail section 17, which can be seen as the supporting part of the drive. This profile rail section 17 is made of steel, but could also be made of another suitable metal, for example an aluminum alloy. In the design according to Figure 1, the profile rail section 17 is an open hollow profile, i.e. it has a longitudinal slot. The basic contour of the profile rail section 17 is U- or C-shaped, with the free edges of the parallel legs facing each other. In the design according to Figure 1, the arrangement is such that the worm 12 lies outside the profile rail section 17. The spindle 14 is mounted in a gear angle formed from two bearing blocks 18, 19 by means of roller bearings. The gear angle lies in the profile rail section 17 without any gaps, i.e. it is inserted into it in a closed manner. In the design according to Figure 1, the gear angle is designed so that it also lies outside the contour of the profile rail section 17. Contrary to the previous designs, the lifting tube 16 could also consist of a metal tube, preferably a steel tube. It would then be provided with two aligned holes 20 at its free end in order to couple the lifting tube 16 to a furniture component to be adjusted. The otherwise usual fork head is then omitted. The profile rail section 17 is also provided with two aligned holes 21, which are arranged in the parallel legs. These legs are perpendicular to the worm 12 and form the side webs of the profile rail section 17. Here too, the otherwise usual fork head can be omitted. However, it is also conceivable that the end areas of the side webs having the holes 21 are designed as tabs.

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Registration text from 10.02.2003

They could also be cranked to form a kind of fork head.

The electromotive furniture drive 10 shown in Figures 3 to 6 differs in details from the design according to Figures 1 and 2. Instead of the lifting tube, the spindle nut 15 is connected to a guide block 22 which surrounds the profile rail section 17 on all sides, i.e. the profile rail section 17 forms a guide for the guide block 22. In a manner not shown in detail, the guide block 22 can be coupled directly or indirectly to a furniture component to be adjusted. To guide this guide block 22, it is provided with a continuous recess 23 which is adapted to the outer contour of the profile rail section 17. In addition, the bearing blocks 18, 19 forming the gear angle are designed differently. The parting plane runs in the direction of the central longitudinal axis of the spindle 14, but can be slightly offset from the axis of rotation of the spindle, since the bearing block 18 facing the drive motor 11 is wider than the bearing block 19 facing away from the drive motor 11. However, the gear angle is designed such that the spindle 14 is mounted by means of roller bearings and that the worm gear (not shown) is also located within the gear angle. As will be explained with reference to Figures 4 and 5, the gear angle is also provided with a recess to accommodate the profile rail section 17. The end of the profile rail section 17 assigned to the gear angle is designed like a tab and has the holes 21, thereby forming a connecting element. The ends run in a circular arc, with the centers of the holes 21 lying in the circle. To limit the end positions of the guide block 22 or the spindle nut 15, the middle web of the profile rail section 17 is provided with domes 24 in order to fix a limit switch bar 25, which is provided with corresponding holes 26. The reverse is also possible. The limit switch bar 25 is equipped with two limit switches 27, 28, which are not explained in more detail. These limit switches 27, 28 can be fixed at selectable intervals on the limit switch bar 25. Figures 4 and 5 show that the guide block 22 is guided on the profile rail section 17 in a closing or play-free manner. The bearing block 18 of the gear angle facing the drive motor 11 is provided with a centering web 29 on the side facing away from the parting plane, which in the assembled

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ated state of Figure 5, it engages around a collar 30 of the housing of the drive motor 11. The gear angle or the bearing blocks 18, 29 forming the gear angle are provided with ribs 31 on the side facing away from the spindle nut 15. Figure 6 shows the furniture drive according to Figures 3 to 5 in a perspective view. This shows that the central web connecting the side webs of the profile rail section 17 is also provided with a bore 32, which can also be used for suspending the furniture drive 10.

The design according to Figure 7 differs from that according to Figures 3 to 6 in that instead of the guide block 22, a lifting tube 33, which is preferably made of steel, is fixed to the spindle nut. The lifting tube 33 is provided with two aligned holes 34 and two slots 35 in the free end area. The holes 34 and the slots 35 can be used to connect a furniture component.

In the embodiment according to Figure 8, the profile rail section 17 has a C-shaped cross-section. The drive motor 11 is flanged to the web opposite the longitudinal slot. Figure 8 shows that in this embodiment the cross-section of the profile rail section 17 can be extremely small, since only such a space is required that accommodates the worm 13 and the worm wheel 14. For the sake of simplicity, the spindle 14, the spindle nut 15 and the lifting tube 16 are not shown. The longitudinal slot of the profile rail section 17 is closed by a cover cap 36. This cover cap 36 can be secured in various ways, for example by screws, but snap-in connections are preferred. Two limit switches 37 spaced apart from one another are inserted in the cover cap 36 in order to limit the end positions of the spindle nut 15 (not shown).

The design according to Figure 9 differs from that according to Figure 8 by a profile rail section 17 with a different cross-section. While in the design according to Figure 8 it is square in its basic contour, in Figure 9 it is rectangular, with the height being greater than the width. The longitudinal slot could in turn be closed by a cover cap. Furthermore, the design according to Figure 9 differs from that according to Figure 8 in that

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Registration text dated 10.02.2003 Page 11

the drive motor 11 is flanged to the leg adjacent to the longitudinal slot. In this design, the spindle 14, the spindle nut 15 and the lifting tube 16 are also not shown.

For the design according to Figure 10, the smallest possible cross-section is required for the profile rail section 17, since the drive motor 11 is placed on the leg engaging the longitudinal slot in a manner not shown in detail, so that the worm 13 lies outside the profile rail section 17. The worm wheel 14 protrudes from the basic cross-section of the profile rail section 17 with an engagement section. In this design, too, the spindle 14, the spindle nut 15 and the lifting tube 16 are not shown.

In the embodiments according to Figures 8 to 10, the drive motor 11 could also be fixed to a gear angle in a manner not shown.

The invention is not limited to the embodiments shown. It is essential that the housing has a profile rail section 17 made of metal or non-metallic material, which represents the supporting component of the electromotive furniture drive 10.

Claims (27)

1. Electromotive furniture drive ( 10 ) with at least one drive motor ( 11 ) and with at least one spindle ( 14 ) and at least one spindle nut ( 15 ), and in which at least the spindle ( 14 ) or the spindles ( 14 ) and the spindle nut ( 15 ) or the spindle nuts ( 15 ) are arranged in a housing, characterized in that the housing has a continuous profile rail section ( 17 ) and that the drive motor ( 11 ) is positioned relative to the profile rail section ( 17 ) in such a way that the output pin is guided through the profile rail section ( 17 ) or is positioned outside of it. 2. Electromotive furniture drive ( 10 ), with at least one drive gear motor ( 11 ) and with at least one spindle ( 14 ) and at least one spindle nut ( 15 ) and in which at least the spindle ( 14 ) or the spindles ( 14 ) and the spindle nut ( 15 ) or the spindle nuts ( 15 ) are arranged in a housing, characterized in that the housing has a continuous profile rail section ( 17 ) and that the drive motor ( 11 ) is located within the profile rail section ( 17 ). 3. Electromotive furniture drive according to claim 1 or 2, characterized in that the drive connection between each spindle ( 14 ) is formed by a gear unit reducing the motor speed with crossing, intersecting or parallel axes. 4. Electromotive furniture drive according to one or more of the preceding claims 1 to 3, characterized in that the furniture drive is equipped with at least two rotationally drivable spindles ( 14 ) arranged parallel and at a distance from one another. 5. Electromotive furniture drive according to claim 4, characterized in that the spindles ( 14 ) are arranged without offset to one another both in terms of height and in their longitudinal directions. 6. Electromotive furniture drive according to claim 4, characterized in that each spindle ( 14 ) is coupled to a drive motor ( 11 ). 7. Electromotive furniture drive according to claim 4, characterized in that each spindle ( 14 ) is mounted in its own profile rail section ( 17 ) or that all spindles ( 14 ) are mounted in a common profile rail section ( 17 ). 8. Electromotive furniture drive according to one or more of the preceding claims 1 to 7, characterized in that a gear angle ( 18 , 19 ) is inserted in the profile rail section ( 17 ), preferably without play, and that the drive motor ( 11 ) is fixed to the gear angle ( 18 , 19 ). 9. Electromotive furniture drive according to one or more of the preceding claims 1 to 8, characterized in that the spindle ( 14 ) is mounted in the gear angle ( 18 , 19 ) by means of at least one rolling bearing. 10. Electromotive furniture drive according to one or more of the preceding claims 1 to 9, characterized in that the output pin of the drive motor ( 11 ) is arranged adjacent to a longitudinal edge of the profile rail section ( 17 ), and that the gear angle ( 18 , 19 ) protrudes from the associated edge and has an opening for the output pin of the drive motor ( 11 ) or for the worm ( 12 ). 11. Electric motor furniture drive according to one or more of the preceding claims 1 to 10, characterized in that the gear angle consists of two bearing blocks ( 18 , 19 ), and that the parting plane runs transversely or in the direction of the longitudinal axis of the spindle ( 14 ). 12. Electromotive furniture drive according to claim 11, characterized in that the parting plane running in the longitudinal direction of the spindle ( 14 ) is offset from the axis of rotation of the spindle ( 14 ). 13. Electromotive furniture drive according to one or more of the preceding claims 1 to 12, characterized in that the half of the gear angle ( 18 , 19 ) facing the drive pin of the drive motor has a centering web ( 29 ) on the side facing away from the parting plane. 14. Electromotive furniture drive according to claim 1 or 2, characterized in that the profile rail section ( 17 ) has an open cross-section and that each bearing block ( 18 , 19 ) engages over at least one outer surface of the profile rail section ( 17 ) through an opening. 15. Electromotive furniture drive according to claim 14, characterized in that the cross-section of the profile rail section ( 17 ) is rectangular in its basic contour with unequal leg lengths or square and that the profile rail section ( 17 ) has partial openings in the closed cut. 16. Electromotive furniture drive according to one or more of the preceding claims 1 to 15, characterized in that one leg of the profile rail section ( 17 ) has a longitudinal slot which is closed by a cover cap ( 36 ). 17. Electromotive furniture drive according to claim 16, characterized in that limit switches ( 37 ) for limiting the end positions of the spindle nut (1S) are arranged in the cover cap ( 36 ). 18. Electromotive furniture drive according to claim 1 S. characterized in that the gear reducing the motor speed consists of a worm ( 12 ) and a worm wheel ( 13 ) engaging therewith and that the output pin of the drive motor ( 11 ) is guided through an opening in a leg of the profile rail section ( 17 ) and that this opening is arranged in a leg opposite the longitudinal slot or in a leg adjacent to the longitudinal slot. 19. Electromotive furniture drive according to claim 15, characterized in that the gear reducing the motor speed consists of a worm ( 12 ) and a worm wheel ( 13 ) engaging therewith and that the drive motor ( 11 ) is offset from the profile rail section ( 17 ) in such a way that the worm ( 12 ) and an engagement section of the worm wheel ( 13 ) are arranged outside the profile rail section ( 17 ). 20. Electromotive furniture drive according to one or more of the preceding claims 1 to 19, characterized in that at least one end of the profile rail section ( 17 ) is designed as a suspension element and that aligned bores ( 21 ) are provided at least in the parallel and spaced-apart side webs of the profile rail section ( 17 ). 21. Electromotive furniture drive according to claim 20, characterized in that at least in the end region having the bores ( 21 ), the side webs which are parallel and spaced apart from one another are designed as suspension tabs. 22. Electromotive furniture drive according to one or more of the preceding claims 1 to 21, characterized in that the lifting tube ( 16 ) consists of metal, preferably of steel, and that aligned bores ( 20 ) are provided in the free end region for connecting a furniture component to be adjusted. 23. Electromotive furniture drive according to one or more of the preceding claims 1 to 22, characterized in that the limit switches on the limit switch bar are fastened to the profile rail section ( 17 ). 24. Electromotive furniture drive according to one or more of the preceding claims 1 to 23, characterized in that each profile rail section ( 17 ) is made of metal, preferably of aluminum, steel, wood, a wood-like material or a plastic. 25. Electromotive furniture drive according to one or more of the preceding claims 1 to 24, characterized in that the output member of the gear unit is a rotary body with an internally threaded bore, and that the spindle ( 14 ) engaging therewith is secured against rotation, but can be moved in its longitudinal direction. 26. Electromotive furniture drive according to one or more of the preceding claims 1 to 24, characterized in that the output member of the drive unit is a rolling body with an internally threaded bore, and that the spindle ( 14 ) is arranged in a stationary manner, and that the furniture drive ( 10 ) is movable in the longitudinal direction of the spindle ( 14 ). 27. Electromotive furniture drive ( 10 ) with at least one drive gear motor ( 11 , 12 , 13 ) and with at least one spindle ( 14 ) onto which a spindle nut ( 15 ) is placed, and in which at least the spindle ( 14 ) or the spindles ( 14 ) and the spindle nut ( 15 ) or the spindle nuts ( 15 ) are arranged in a housing, characterized in that the housing has a continuous profile rail section ( 17 ) made of metal, preferably steel, and that the drive motor ( 11 ) is positioned relative to the profile rail section ( 17 ) in such a way that the output pin passes through the profile rail section ( 17 ) or is located outside it.