DE2436753A1 - Actuator for curtain sliding along horizontal rail - has electric motor drive unit and conductors woven into curtain - Google Patents

Abstract

In order to save space and to simplify the design the actuator drive is connected to the power source by supply cables which form an integral part of the folding curtain. The supply cables can be woven into the textile material. The motor is connected to the support rail of the curtains and the curtains are stretched across the gap by being pulled by the electric motor drive unit which travels to the extreme position. The system has actuating cams for reversing the motor drive. A friction drive roller is associated with the motor, the displacement of the axis of rotation of the roller being angled to the path of travel. Preferably two friction drive rollers are provided with counter-rotating axes of rotation.

Description

Hans Egli, 8954 Geroldswil / Switzerland Hans Kaser, 8116 Würenlos / Schwelz Drive device for displacement elements such as curtains, folding doors and the like.

The invention relates to a drive device for along a movement path Sliding elements that can be moved in both directions, such as curtains, folding doors and the like. Which are connected to the displacement element, ml..tlaufendes and The electric motor drive unit that transmits the drive force to the trajectory and at least two feed lines to a feed current source.

The problem with such drives is that they are noise-saving and trouble-free Design of the power supply as well as the reversal of the direction of movement in the End positions in connection with the reliability of the power transmission, for what in general - i.e. without relatively high construction costs - only one friction drive with electric motor driven Friction rollers and a corresponding one Friction path along the movement path of the displacement element comes into consideration.

The object of the invention is to provide a simple solution to this Overall problem, whereby use of different, for itself novel solution measures is made, which in combined application an optimization of the drive present Type enable, but if necessary awh on its own or in partial combinations bring significant advantages.

Accordingly, the main solution features are as follows: a) The feed lines are flexible and their effective length is due to their corrugation changeable. This allows the otherwise common busbars with sliding contacts and the associated susceptibility to failure eliminated. Such flexible, Corrugated lines fit the curtain or the like in shape. and runs well ar. and can easily be connected to the curtain at short intervals or even steadily which results in an aesthetically satisfactory experience in particular. Such lines can also be worked into a textile curtain in particular and / or made of electrically conductive textile material. Also comes possibly an elastic longitudinally contracting execution of such elastic, corrugated lines are advantageous.

b) The feed lines can also be designed to be flexible, but not with corrugation according to the respective position of the displacement element, but along the path of movement essentially in a straight line and at least too little at least a supply loop at / one end of the path of movement. It can do this in particular a supply roll with spring force recovery or a supply loop be provided with weight load while the rectilinear section of the feed line advantageously by a trough of a running along the path of movement Guide element for the curtain or the like.

is directed.

c) The movement switching and start-stop control is through on both ends de. Movement path arranged and by the displacement element itself actuatable switching devices released, the feed circuit of the drive unit two each assigned to a direction of movement, alternately by means of a toggle switch Has switchable current branches and the changeover switch with the end switching devices the movement path is in operative connection in such a way that the inlet of the displacement element in its end positions automatically the changeover from one to causes the other of the two current branches, while a current direction switch acts as a start-stop control element is used in the feed branch. In this way, not only is the automatic one particularly easy Limit switch-off, but also the reversal of the direction of the drive by means of only two Feed lines and only one manually operated switch reached. In particular, comes as a manual switch, a step-by-step changeover switch can be considered, which when actuated Start or Stop within the path of the displacement element (in each case vice versa to the previous state of motion) and when actuated at a standstill at the ends of the Movement path The only possible direction of movement triggers automatically in each case, and always by the same simple operation of the switch.

d) Reliable frictional engagement when transmitting the driving force is supported by a three-point support of the drive unit or a frame inside the same in connection with a pivotable mounting around a pure trajectory causes transversely arranged- axis, with at least three in the longitudinal direction of the movement path mutually spaced support elements are provided.

Two outer of these support elements are depending on the pivot position alternately from one side and a central support element from the other side attachable to a guide element extending along the movement path, whereby at least one of the support elements is formed by a friction and drive roller. Because the points of application of the driving force and the inertia force of the displacement element, i.e. the point of contact of the friction roller on the friction track on the one hand and the attachment point of the displacement element on the drive unit or on its pivotable frame on the other hand, they are always offset from one another in the direction transverse to the movement path or can be brought into a corresponding position, this always results in a Increased contact pressure between the friction roller and the friction track due to the driving force, i.e. a servo effect with extremely safe power transmission. Basically two can Low-friction support elements ausson and one or more friction rollers in between be arranged on the swivel frame, or vice versa, two friction rollers, of which Then each is assigned to a direction of movement, outside and a low-friction StUt.element between.

e) Securing the frictional connection of the drive is useful - in addition to or instead of the self-reinforcing pivot pressure - through an acute-angled displaceability of the friction roller axis of rotation with respect to the friction path improved, the displacement path of the axis of rotation in each case in a direction of movement seen of the displacement element approximates the friction path. The driving force causes then a wedge-like one which is also self-reinforcing Contact pressure between Friction roller and friction track.

It is also important that the drive unit is connected used with standard curtain rails without changing the latter can be. For this purpose, according to the invention, the drive unit with a - preferably in the middle of the longitudinal or. Expansion of the drive unit measured in the direction of travel arranged - support and guide element are provided, which one in the running rail insertion opening insertable head that can be swiveled within the profile interior of the running rail having. All that is then required is the distance between the central axis of the head and a side surface of the drive unit less than the distance between the Insertion opening and the adjacent end of the running rail to be dimensioned to a problem-free insertion of the support element head with subsequent pivoting of the drive unit in the working position with parallel to the running rail extending To enable side surface of the drive unit. On the swiveling training of the support element head Within the running rail profile can be dispensed with, wensl is the distance between the head center axis of the support element and one with this Axis In the direction of travel of the unit, the aligned end of the latter is smaller than the mentioned end distance of the running rail insertion opening is dimensioned. Also at the often desired design of the drive unit with two in the direction of travel mutually spaced support elements is the insertion in usual curtain rails possible if the support element head swivels in the track profile - this condition only needs to be met for one of the two support elements to be - the distance between the central axis of the head that can be swiveled in the track profile and a side surface of the drive unit and at the same time the distance between the head center axis of the other support element from the one adjacent to it, in the running direction seen end of the drive unit smaller than the end distance of the running rail insertion opening is sized.

The invention is further illustrated with reference to the drawings Embodiments explained. Herein shows: Fig.l a first embodiment of the Errindungsgemässen Drive device with a curtain as a displacement element, Fig. Ia a modification the embodiment according to Fig.l with feed lines incorporated into the curtain, Fig.2 an embodiment with lines permanently attached to the curtain, FIG. 3 an embodiment with feed lines guided in a hemstitch of the curtain, FIG. 4 an embodiment with longitudinally contracting feed line, Fig. 5 a version with tensioned feed lines lind supply loops, Fig. 6 an embodiment with a feed line guided in a profile, 7 shows an embodiment with coil-shaped supply loops, FIG. 7a a retrieval drum from the device according to FIG. 7, FIG. 8 an embodiment with end switching devices on the trajectory of the drive unit, Fig. 9 the electrical circuit of the Device according to FIG. 8, FIG. 10, an embodiment with an automatically increased adhesion Friction drive unit, 11 shows a modified embodiment similar to FIG. 10, FIG. 12 shows a further embodiment with a drive unit similar to FIG. 10, 13 shows an embodiment with which can be inserted into a commercially available curtain running rail Drive unit, Fig. 14 an embodiment similar to Fig. 13 with in the running rail profile pivotable support element of the drive unit, FIG. 15 an embodiment with in a Commercially available curtain track, insertable, two supporting elements having drive unit in side view and Fig. 16 a vertical sectional view of the embodiment according to Fig. 15.

In the embodiment according to Fig.l is a curtain 1 with rolling or sliding hooks 2 of the usual type displaceable on a guide element in the form of a running rail 3 suspended, which determines the path of movement of the curtain and one with the curtain end connected drive unit 4 by means of sliding elements 5 slidably carries.

The drive unit 4 can be of a type known per se and e.g.

with friction rollers not shown here on one see in the longitudinal direction engage the running rail extending friction track to the driving force of an electric motor to be transferred to the trajectory.

The drive unit is via two flexible and corrugated feed lines 6 and 7, which by stitching 61 and 71 respectively with distance and on a small Part of their length are connected to the curtain, to a not shown here Supply current source connected. This results in a power supply without interfering and wear-prone sliding contacts and without space-consuming power supply lines.

In addition, there is a special feature in the embodiment according to Fig.la inconspicuous and aesthetically satisfactory solution of power supply through two feed lines 6a and 7a in the form of thin, soft, flexible strands, wires or electrically conductive ones Textile threads that are incorporated into the curtain l, for example woven in as warp threads or acted upon.

A version according to is recommended, especially for higher currents according to Fig.2 with attached to the curtain continuously or at small intervals over its length or glued flat strands 8 and 9.

Here, too, there is an aesthetically satisfactory design of the Power supply, especially in the case of decorative strands or the like. That in turn can consist of conductive textiles.

Independence from the requirements of a decorative line design results according to FIG. 3 by accommodating the feed lines 10 and 11 in one Hemstitch or the like. La of the curtain 1. Deese line routing is advantageous placed in the area of the lower edge of the curtain, with the lines at the same time serve to weigh down.

According to FIG. 4, the power is supplied via a longitudinally contracting one Feed line 12 with sliding hook 13 for suspension on a running rail. With two-wire Execution of such a line results in a sliding contact-free power supply.

The embodiment according to Figure 5 has two lengths of the movement path of the displacement element - e.g. a curtain not shown here or the like - or along the running rail under tension @@ hr or less stretched feed lines 14 and 15, which leave the drive unit 4 in opposite directions and their tensile force on the drive unit compensate each other.

This avoids additional loading of the drive.

The feed lines 14, 15 are in the region of the ends of the movement path guided over pulleys 16 and 17, respectively. and here each reproduce one another vertically Storage loop 38 or 19 extending below. The tension of the feed lines is supported by weights 20 resp. 21 applied.

The Abwan development according to Figure 6 looks at a running rail 300 with a additional open channel profile 301 a two-core feed line 22 before the into the channel profile 301 via a bracket 22a attached to the drive unit 4 is directed and within the same by longitudinal displacement of the movement of the drive unit can follow. It can be used in conjunction with such a construction for example a tensile stress on one side by means of a supply loop 18 according to FIG. 5 for the Feed line 22 can be applied. However, in particular, it can also be advantageous in Connection with the construction according to FIG. 6 an opposing guide and a compensated tensile stress of two feed lines according to Fig. 5 can be applied. being rich, for example, the veins of the feed line 22 immediately behind the Separate bracket 22a and in opposite directions within the gutter profile 301 runs.

The designs according to Fig. 5 and Fig. 6 have the same advantage that the feed line saves space and even has no connection to the displacement element can be guided along the trajectory. It also enables execution according to Fig. 6 a particularly safe and inconspicuous line routing.

The embodiment according to Figure 7 also shows two of the drive unit 4 feed lines 23 and 24 running in opposite directions, but here each with a drum 25 or 26 with a plurality of supply loops in the form of a supply roll each leads. 7a shows the generation of the tensile stress or restoring force by means of a coil spring 27 to each of the drums. The particular advantage of this Execution is the comparatively small space requirement of the supply loops in form a wrap.

Fig. 8 shows a drive unit 4 with two ends of the movement path with switching nooks 30 and 31 assigned switching devices 28 and 29 YWr the reversal the direction of movement. If the drive unit 4 e.g. in the direction of arrow A runs into its left end position, actuate the switching cam 30 the switching device 28 and thereby not only stops the drive but also reverses it the direction of movement, but only after switching on again takes effect. The same applies to the other end of the trajectory with the switching device 29 and switching cams 31.

The above-mentioned mode of operation results from the circuit according to Plg.9. After this, the electric motor M of the drive unit 4 is via two by means of one Switch 32 alternately switchable supply branches with opposite directions Directional conductors 4a or 4b - e.g. diodes - as well as via the feed lines 6 and 7 with a DC power source 35 is connected. The switch 32 is - for example as shown by mechanical spring locking - bistable and is made by means of the switching devices 28 and 29 designed as simple plungers according to FIG. 8 switched in the end positions of the drive unit, with either one or the other of two associated contacts 33 and 34 closes or opens. In this way, the one or the other directional conductor feed branch is switched on in each case.

A current direction switch 36 is also included in the supply circuit Switching contacts 40 arranged. This switch is with his on the actuator of the contacts 40 acting against a restoring force indicated by arrow X ' Cam 7 and a switch * .d 39 which can be actuated by hand switch 38 as a step switch trained so that so each Actuation of the manual button 38 a permanent reversal of the current direction in the supply circuit.

Let the switching state according to FIG. 9 be the direction of movement of the Drive unit assigned according to arrow Y, with the feed current circuit conducts current with directional conductor 4b. If now the switch 32 by the switching device 28 is switched in the left end position of the drive unit, so opens Contact 33, while contact 34 closes. The thus-encapsulated supply branch with directional conductor 4a locks in the current position of the current direction switch 36 or the contacts 40, so that the shutdown takes place. A subsequent actuation of the hand switch 38 causes the direction of current to be reversed through the contacts 40, so that the Feed branch with directional conductor 4a is now applied in the forward direction and the Mctor M starts up with the opposite direction of rotation. In the opposite end position of the drive unit, the same process is reversed. It will be so little Effort achieved both the limit switch and the direction reversal, and with only one actuator that is always to be operated in the same way, namely the hand switch 38.

In the Ausfülirung according to Fig.10 is a drive unit 41 with three on the running rail 3 engaging support elements in Form a on a friction track 3a of this rail engaging friction roller 44 and two in opposite directions for this purpose slide-guide elements 44a and 44b engaging the rail are provided.

The shaft 44c of the - in a manner not shown - over an elastic Coupling or the like. Verb with an electric motor which friction roller 44 is in one V-shaped slot 45 with two legs which are inclined at an acute angle to the running rail 3 45a and 43b mounted displaceably. Already in the lowest position of the shaft 44c the circumference of the friction roller 44 is in contact with the R.eibbahn 3a. Turns now the friction roller e.g. in the direction of arrow B, the shaft 44c is in the direction of the arrow C in the leg 43b of the slot 43 and thus the friction roller pressed more against the friction track. So it results in a simple way through Wedge effect a self-reinforcement of the static friction and thus a very safe power transmission. As a result of the symmetrical design of the displacement path of the friction roller shaft, the following applies the same for both directions of movement.

In the embodiment according to Fig.ll there are two friction rollers for one direction of movement each and with one seen in the respective direction of movement, the friction path is at an acute angle approximate displacement path of the friction roller axis or shaft in Forr corresponding Slots provided. If e.g. di2 roller 47 is driven according to arrow B1 and the on drive unit 46 moved in the direction of arrow Z, the shaft of the roller 47 is displaced in its guide slot according to arrow C1 and the roller is pressed against its friction path by a wedge effect. Simultaneously causes the opposite to the direction of movement and below a guide element 51 acting on the running rail 3 on the drive unit 46 retraction force D of the pulled Curtain (not shown here) a pivoting of the entire drive unit around a fulcrum formed by the guide element 51 and thus another point of rotation increased pressure on the friction roller in operation. This panning is indicated by the arrow E.

The same applies to the opposite direction of movement for the friction roller 48 with direction of rotation according to arrow B2 and displacement of the associated shaft according to arrow B2 and to the arrow E opposite pivoting of the entire drive unit the guide element 51. The friction rollers are driven by their part, for example driven by one or two electric motors, also by frictional engagement Drive rollers 49 and 50 acting on the circumference of the friction rollers 47 and 48, respectively.

Fig. 12 shows another with the same, double-acting adhesive reinforcement working drive device, but with a common drive roller 52 for two pulleys 53, 54.

Here the pivoting takes place with increased pressure of the respective force-transmitting friction roller around that of the sliding guide elements 55a and 55b, which is seen in the direction of the retraction force D in front of the other, in the illustrated Example about the sliding guide element 55b. Prerequisite for such a pivoting is of course a sufficient withdrawal option with a corresponding game between the top of the drive unit 46 and the bottom of the running rail 3 for the slide guide elements provided here as support elements. Such Pivotability with its prerequisites also applies to the version according to Fig. 10.

In the embodiment of Fig. 13, a drive unit 56 is with a in a vertical view square support or guide element button 57 is provided, the can be inserted into the insertion opening 3b of a commercially available running rail 3. No changes are required to the running rail because of the distance Central axis of the between the / opening 3b and the abutting against a wall 59 or the like The end of the running rail is greater than the distance between the central axis of the support element head 57 and an end face aligned with the support element, viewed in the direction of movement 58 is.

In general, an opening radius relating to the distance "is sufficient - Running rail ends lower dimensioning of the distance "support head wall - drive unit end.

In the embodiment according to Fig. 14, it is also suitable for christening rails with a smaller distance "opening edge - running rail end" through swiveling Design of the support element head 61 on the top of a drive unit 60 in the interior of a commercially available running rail 3, in the example the support element head Circular in vertical view and otherwise in the form of a common one Insertion opening 3c adapted to the running rail. ESr the applicability is sufficient here a lower Bezrezsung in relation to the distance "opening edge - running rail end" of the distance Z "head edge - drive unit side surface". The wall 59 resp. the side surface of the drive unit, 60 adjacent to the end of the running track, is with 62 designated.

The embodiment shown in Fig. 15 and 16 with two support elements 71a and 71b on the top of a drive unit 70 is also a commercially available one Running rail 3 with insertion opening 30 can be used. The head of the support element is for this purpose 71a pivotable in the interior of the running rail profile, namely in a vertical view circular; formed while the distance between the side surface Y2 of the drive unit 70 and the end of the running rail 3 lying on the wall 59 is less than the distance is dimensioned between the insertion opening 3c and the said running rail end. This makes it possible to have the head of the support element 71a in the with continuous Position of the drive unit shown in the lines; aAca. 70 to be inserted into the insertion opening 3c. The unit is then moved from the dashed line to the dashed line position shown pivoted, @this then also the support element 71b in the insertion opening 3c used can be. The distance between the head edge of the support element 71b and the longitudinal end surface 73 is less than the distance W "insertion opening - running rail end" must be dimensioned.

The same is achieved if the distances between the two support element heads of the respectively adjacent longitudinal end faces of the drive unit less than the distance between the "insertion opening and the end of the track" must be measured. A swing around 1800 is also possible with comparatively small distances between the support elements from the adjacent housing ends, i.e. if there is an advantageously large mutual Distance, the insertion of both support elements in a single insertion opening, which is also can have a comparatively small distance from the adjacent end of the track.

These designs are for drive units with a support guide element or more of the same are provided, one of which is adapted to the hollow profile of the running rail Head part and a shaft part adapted to the slot opening of the hollow profile. These carrying-guiding elements can then be inserted into the insertion opening with their head part the running rail, which is intended for the usual sliding or rolling hooks anyway, can be used.

Claims (26)

Expectations Drive device for along a movement path in both directions movable displacement elements, such as curtains, folding doors and the like. That one with connected to the displacement element, and the driving force on the Movement path transmitting, electromotive drive unit and at least has two feed lines to a feed current source, characterized in that that at least one of the feeding boys is flexible and by corrugation in its effective The length is variable and that the feed line has at least one Part of its length with the also corrugated or foldable displacement element connected is. 2. Drive device according to claim 1, for a soft, flexible, corrugated curtain, characterized in that the flexible and corrugated feed line than with the curtain over at least part of its length steadily or in short Distances connected strand is formed. 3. Drive device according to one of the preceding claims for a textile curtain, characterized in that the flexible and corrugated feed line is incorporated into the curtain. 4. Drive device according to one of the preceding claims, characterized characterized in that the flexible and corrugated feed line made of conductive textile material consists. 5. Drive device according to one of the preceding Andie claims, characterized in that / flexible and corrugated feed line elastically longitudinally contracting is trained. 6. Drive device according to one of the preceding claims, characterized characterized in that a motion contact-free power supply for the drive unit is provided with at least two flexible and corrugated feed lines. 7,. Drive device for along a movement path in both directions movable displacement elements, such as curtains, folding doors and the like. That one with the displacement element connected, tr'itlaufende and the driving force on the movement path transmitting, electromotive drive unit and at least has two feed lines to a feed current source, in particular after one of the preceding claims, characterized. that both ends of the trajectory One switching device each that can be actuated by the movement of the displacement element it is assigned that the supply circuit of the drive unit has two directions of movement has associated current branches that can be switched on alternately by a changeover switch, that the changeover switch with the end switching devices of the movement path in such a way The operative connection is that the inlet of the displacement element is in its end positions automatically switching from one to the other of the two directions of movement Associated branches causes, and that the supply circuit has a current direction switch has as a start-stop control member. 8. Drive device mach claim 7, characterized in that A step switch is provided as the current direction switch f the start-stop control is. 9. Drive device according to claim 7 or 8, characterized in that that in the two feed current branches assigned to a direction of movement each in opposite directions blocking or permeable directional conductors are arranged .. 10. Drive device for along a movement path in both Movable directions, elements, such as Curtains, folding doors and the like. That a connected to the displacement element, follow-up and the Electromotive drive unit that transmits driving force to the trajectory as well as having at least two feed lines to a feed current source, in particular according to one of the preceding claims, characterized. that the drive unit has at least one friction roller, the ar, one extending along the movement path Friction element engages to transmit the driving force, and a frame with at least three spaced apart in the longitudinal direction of the path of movement Includes support elements, two of which are outer in opposite directions to a middle one can be attached to and from a guide element extending along the movement path at least one of which is formed by a friction roller, and that this frame is mounted pivotably about an axis arranged transversely to the movement path. 11. Drive device according to claim 10, characterized in that that there are two outer, low-friction frames on one long side of the pivoting frame of the guide element engaging support elements and at least one with respect to the longitudinal direction of the B0wegwigsbahn provided in between arranged friction roller and that this friction roller on another longitudinal side serving as a friction belt engages the guide element. 12. Drive device for along a movement path in both directions movable displacement elements, such as curtains, folding doors and the like. That one with connected to the displacement element, and the driving force on the Electromotive drive unit transmitting the trajectory and at least has two feed lines to a feed current source, in particular after one of the preceding claims, characterized in that for the transmission of the Driving force from the drive unit to one extending along the path of movement Friction track at least one friction roller with sliding part with respect to the drive unit Axis of rotation is provided and that the displacement path of the friction roller axis of rotation is arranged at an angle to the friction track. 13. Drive device according to claim 12, characterized in that that the displacement path of the friction roller axis of rotation is in the respective direction of movement seen of the displacement element of the friction track arranged approximately at an acute angle is. 14. Drive device according to claim 12 or 13, characterized in: that two friction rollers can be displaced inclined in opposite directions with respect to the friction path Rotary axes are provided. 15. Drive device according to claim 12 or 13, characterized in that that a friction roller with abschnlttswelse against sensible and acute-angled is provided inclined to the friction path arranged displacement path of its axis of rotation. 16. Drive device according to one of claims 12 to 35 characterized in that an additional, elastic pressure of the friction roller against the friction track is provided. 17. Drive device for along a movement path in both directions movable displacement elements, such as curtains, folding doors and the like. That one with connected to the displacement element, and the driving force on the Electromotive drive unit transmitting the trajectory and at least having two feed lines to a feed current source, characterized. that at least one flexible and essentially stretched along the path of movement guided feed line is provided, which leads to at least one supply loop at least one end of the trajectory is guided. 18. Drive device according to claim 1 ?, characterized in that that at least at one end of the movement path a storage loop with weight load is provided. 19. Drive device according to claim 17, characterized in that that at least at one end of the trajectory one by one Feed line formed supply roll with spring return is provided. 20. Drive device according to one of claims 17 to 19, characterized characterized in that-at two spaced apart locations on the path of movement each a supply loop is arranged and that for these two supply loops oppositely acting return forces are provided. 21. Drive device according to claim 20, characterized in that that a supply loop is arranged at both ends of the movement path. 22. Drive device according to one of claims 17 to 21, characterized characterized in that the substantially stretched along the path of movement Part of the feed line through a channel of a guide element, which is open in cross section is led. 23. Drive device for along a movement path in both directions movable displacement elements, such as curtains, folding tones and the like connected to the displacement element, revolving and the driving force having an electric motor drive unit which transmits the trajectory, zurn Use in a running rail with a slot-shaped open hollow profile and with a predetermined Distance from one end of the rail arranged insertion opening for Support-guide elements, in particular according to one of the preceding claims, characterized characterized in that at least one support-guide element on the drive unit with a shaft part adapted to the slot opening and with a hollow profile the running rail adapted head part is provided and that the head part of the support-guide element is designed to be inserted into the insertion opening of the running rail. 24. Drive device according to claim 24, characterized in that that the distance between the head edge of the support-guide element and a side surface of the drive unit is less than the distance between the insertion opening and the adjacent end of the running rail is sized. 25. Drive device according to claim 23 or 24, characterized in that that the distance between the head wall of the support-fixing element and an adjacent, seen in the direction of movement end surface of the drive unit less than the Measure the distance between the insertion opening and the adjacent end of the running rail is. 26. Drive device according to one of claims 23 to 25, characterized characterized in that the head part of the support-guide element within the hollow profile the running rail is pivotable with respect to the axis of the shaft part, preferably on its circumference rounded at least in sections, in particular circular isto L e r s e i t e