Door drive for one door leaf with roller chain and locking unit

Abstract

Door drive (20) for a door leaf, comprising - a roller chain (24) driven by a motor (22), - a gear wheel (26) deflecting the roller chain (24), - a locking unit (28) formed from - a carrier unit (30) firmly connected to the roller chain (24), - a door connection (33) for connection to a door leaf, - a connecting element (32) extending along the roller chain (24), which is pivotally mounted at its first end on the driver unit (30) via a first pivot bearing (34) and at its second opposite end on the door connection (33) via a second pivot bearing (36), wherein the locking unit (28) is arranged such that, in a closed state, both pivot bearings (34, 36) are arranged in an end position on the gearwheel (26) on the same circumferential half of the gearwheel (26) and thereby assume an over-center position relative to one another with respect to a direction of movement of the roller chain (26) into an open position.

Description

The present invention relates to a door drive for a door leaf, in particular for a vehicle door of a public transport vehicle. The invention is particularly suitable for single-wing or two-wing sliding or pivoting sliding doors.Door drives for a motor vehicle or a rail-bound vehicle are generally known. By means of the known door drives, doors can be automatically displaced between an open position and a closed position, wherein a passage is opened in the open position and the passage is blocked in the closed position.For example, DE 10 2014 101 036 A1 discloses an automatic sliding door having a drive unit and at least one movable door leaf. The door leaf is displaceable between an open and a closed position. The drive unit has at least one electric motor with a gear and an endless toothed belt, on which the door leaf is fastened to a strand by drivers. The sliding door has a locking device with which the movable door leaf can be locked or unlocked, wherein the locking device acts on the motor shaft of the drive motor.In most cases, the door drives are placed in the upper portal region and consist mostly of toothed belts or spindle drives. Often, the combination of a locking device with door drives arranged there is also difficult and does not function reliably over the long term. Also, the usable space above the door openings is significantly reduced, which is disadvantageous.A further disadvantage is that the installation of an additional locking system is complicated and associated with costs.The object of the present invention is to provide an alternative door drive for a door leaf of a sliding or pivotable sliding door which is constructed as simply and compactly as possible, but nevertheless functions reliably in a permanently reliable manner. Furthermore, the door drive is to be suitable for a secure locking of the door opening and be usable with single-wing or two-wing doors. In particular, the effort for maintenance and maintenance should also be low. It is a further object of the invention to propose a vehicle with a corresponding door drive.According to the invention, the object is achieved by a door drive having the features of claim 1, a two-wing door having the features of claim 11 and a vehicle having the features of claims 12 or 13.Accordingly, a door drive according to the invention for a door leaf has a roller chain driven by a motor, which is deflected by a toothed wheel. On this roller chain, a locking unit is fastened for each door leaf, which can be moved with the roller chain and simultaneously moves the door leaf fastened to it. For this purpose, the locking unit has a driver unit firmly connected to the roller chain, a door connection for a connection to the door leaf, and a connecting element extending along the roller chain, which is mounted with its first end pivotably via a first pivot bearing on the driver unit and with its second opposite end pivotably via a second pivot bearing on the door connection. The locking unit, by virtue of the connection to the door connection, also acts as a drive unit for the door leaf.By moving the roller chain, the locking unit or the connecting element is moved during the movement from an open position into a closed position into the region of the gearwheel. The first pivot bearing, which connects the connecting element to the driver unit, moves along the outer periphery of the gearwheel, starting from a straight roller chain course, by preferably at least approximately 95°, preferably approximately 100° around the gearwheel. In the end position, which corresponds to the closed position of the door leaf, the second pivot bearing, which pivotably connects the connecting element to a door connection and is arranged behind the first pivot bearing in this direction of movement, is then still located in the linearly extending region of the roller chain in front of the gearwheel. In the end position, the two pivot bearings are positioned in such a way that they assume an overtend point position with respect to one another. This is achieved in that the axis of rotation of the gearwheel is located next to an imaginary connecting line extending between the two pivot bearings. In other words, the first pivot bearing is located below a center line of the gearwheel which runs parallel to the linearly extending region of the roller chain and through the center point of the gearwheel, while the second pivot bearing is still located above said center line. A movement of the roller chain in the opposite direction, i.e. in the direction of the open position, is not possible in this position by pulling on the door leaf or on the connecting element. In order to be able to open the door leaf, the gearwheel must first be rotated back until both pivot bearings are again located above the imaginary center line.In a particularly advantageous embodiment variant, the gearwheel is designed as a drive pinion for the roller chain. Alternatively, a corresponding drive pinion can be provided at another location in the course of the roller chain; it is also conceivable to use a plurality of drive pinions which engage in the roller chain at different locations.The locking can preferably be further improved in that the connecting element has a recess which is open in the direction of the gearwheel and, in the closed position of the locking unit, bears against a retaining element connected to the gearwheel, which effectively prevents the connecting element from moving back linearly. The recess is preferably arranged adjacent to the first pivot bearing and is designed as a semicircular recess which, in the end position, bears against a cylindrical retaining element protruding from the gearwheel. The semicircular recess and the cylindrical holding element are matched to one another with respect to their radius or diameter.In a particularly advantageous embodiment variant, the connecting element, starting from the second pivot bearing in the direction of the first pivot bearing, initially has a straight-extending region, which is adjoined by a second straight region angled in the direction of the gearwheel. The semicircular recess is arranged in the transition region between the two straight regions and directly next to the second pivot bearing.The connecting element can preferably be formed by two side parts which are aligned parallel to one another and extend along the roller chain and are connected to one another by means of a pivotable connecting bolt. The two side parts are thus located on one side of the roller chain, the roller chain is located between the two side parts. The connecting pin is arranged on the side of the roller chain opposite the sprocket and oriented transversely to the direction of movement of the roller chain; it simultaneously serves as the second pivot bearing.In a particularly preferred embodiment, further bolts are located between the two side parts. The side parts are designed to be wider or higher than the width or height of the roller chain, so that the bolt or bolts and the connecting bolt can extend past the roller chain. Alternatively, separate individual holding sections can be provided, which extend in the direction away from the gear wheel and have receptacles for the bolts and the connecting bolts.The first pivot bearing is fastened at least to a chain link of the roller chain, preferably via a spring lock which is connected to chain links of the roller chain. Such a spring lock has, for example, laterally protruding flat plates, via which the chain link can be connected to external elements, in this case thus to the pivot bearing. Only one, but preferably two lateral flat flaps can be provided.In a particularly advantageous embodiment variant, an actuator is provided which is arranged so close to the gearwheel that it can be contacted by the driver unit during its movement along the circumference of the gearwheel in the direction of the closed position. The actuator can be designed, for example, as a rotatably mounted lever which is pivoted or rotated by the contact with the driver unit. This rotational movement can be used, for example, for driving a further component or for switching a switch.Preferably, the actuator can drive a locking bolt, which can serve as an additional locking of the door leaf. In the end position, the locking bolt is thus pushed into a corresponding opening or behind a retaining element in the door frame and locks the door or door leaf securely in the door portal.The actuator has a contact region for contact with the driver unit and a drive lever, wherein the drive lever drives the locking bolt by the rotational movement of the actuator. Preferably, the contact region and the drive lever form an angle of approximately 90° in the direction of the gearwheel. The actuator is arranged in extension of the longitudinal direction of the roller chain next to the sprocket.In a particularly advantageous embodiment variant, the contact region faces the gearwheel and is designed in the form of a fork with two fork prongs. The driver unit has a driver pin which is guided between the fork prongs during the movement around the gearwheel and thus drives the actuator with it during the further movement. In the starting position, i.e. the open position, the fork-shaped contact region is aligned obliquely tangentially to the gearwheel, so that the driving bolt can be guided, so to speak, from above between the fork prongs and, during the return movement, out of the latter again.Preferably, the roller chain can have at least one, optionally several, tensioning elements in its course, by means of which the roller chain can be changed in its length. The clamping element facilitates the adjustment, in particular in the case of two door leaves, during their mounting. The end stops can be adjusted in the open and closed positions by means of the adjustable clamping element. This is important since the door leaves must be exactly aligned in the respective end positions. Due to manufacturing tolerances and different installation situations, a subsequent adjustment of the end positions after installation of the door element via the clamping element is very advantageous. In addition, changes which arise as a result of the operation of the vehicle over a longer period of time can also be compensated for by means of the tension element. On the one hand, the roller chains can themselves be elongated or stretched, and on the other hand, the carriage body can also deform during travel because of torsion, braking and acceleration.An adaptation of the end positions can also or additionally be made possible via elongated holes, via which the various components of the door drive are connected to one another. In particular, the fastening of the door leaves to the driver unit is advantageous via elongated holes, since it can thereby be ensured that the main closing edges of the door leaves meet properly in the closed position.The invention is explained in more detail with reference to the following figures. The figures show only preferred embodiment features and are not intended to limit the invention to these.The following are shown: FIG. 1 : a door drive according to the invention for a two-wing door in the open position, FIG. 2 : the door drive according to the invention from FIG. 1 in the closed position, FIG. 3 : a detail view of a drive side of the door drive, FIG. 4 : a detailed view of the drive side from FIG. 3 of the door drive without motor and bearing housing, FIG. 5 : a detailed view of the drive side from FIG. 3 of the door drive without motor and bearing housing in an intermediate position, FIG. 6 : a detailed view of the drive side from FIG. 3 of the door drive without motor and bearing housing in the locked state, FIG. 7 : shows the door drive in a perspective view. FIG. 8 : a detailed view of a driver unit,The figures show a door drive 20 for a door leaf, not shown. This is preferably arranged above a door opening, likewise not shown. A motor 22 drives a roller chain 24, wherein the roller chain 24 is deflected via a gearwheel 26 in the exemplary embodiment shown.A locking unit 28 is arranged on the roller chain 24 and moves with the roller chain 24. The locking units 28 in turn have a driver unit 30 firmly connected to the roller chain 24 and a door connection 33 for connection to a door leaf. In the exemplary embodiment shown, two locking units 28 are shown, which are each connected to a door connection 33 and each drive a door leaf. Because both locking units 28 are attached to the same roller chain 24, a synchronous movement of the two door leaves is always reliably ensured.In the exemplary embodiment shown, the gearwheel 26 is designed as a driving pinion which is driven by the motor 22.A connecting element 32 is shown which extends along the roller chain 24 and is mounted with its first end pivotably on the driver unit 30 via a first pivot bearing 34 and with its second opposite end pivotably on the door connection 33 via a second pivot bearing 36. According to the invention, the two locking units 28 are arranged on the roller chain 24 in such a way that in a closed state both pivot bearings 34, 36 are arranged on the same circumferential half of the gearwheel 26 in an end position on the gearwheel 26. This arrangement causes the locking units 28 to assume an over-center position with respect to one another with respect to a direction of movement of the roller chain 24 into an open position. This end position can be seen in particular in FIG. 6. A dashed center line M is shown, which runs through the axis of rotation of the gearwheel 26. Also shown is a solid connecting line V between the two pivot bearings 34, 36, which is arranged offset parallel to this center line.FIGS. 4 to 6 in particular illustrate the function of the door drive 20 according to the invention starting from an open position (FIG. 4 ) via an intermediate position, FIG. 5 ) into a closed position or end position (FIG. 6 ). It can be seen that the connecting element 32 has, adjacent to the first pivot bearing 34, a recess 38 which, in the closed position of the locking unit 28, bears against a retaining element 40 connected to the gearwheel 26.In the exemplary embodiment shown, the recess 38 is embodied as semicircular, and the holding element 40 has a circular outer circumference with a diameter corresponding to the recess 38. The holding element 40 is designed as a laterally projecting stub axle of the axis of rotation of the gearwheel 24. In the embodiment variant shown, the connecting element 32 is designed to be angled in the direction of the gearwheel 26 in the region of the recess 38, which is favorable with regard to the holding forces in the locked state and also with regard to the placement of the recess 38 on the holding element 40.The figures further illustrate that an actuator 50 and a locking bolt 56 together form an additional locking unit 58. For this purpose, the actuator 50 is arranged so close to the gearwheel 26 that it can be contacted by the driver unit 30 during its movement along the circumference of the gearwheel 26 in the direction of the closed position. The actuator 50 is rotatably mounted, has a contact region 52 for contact with the driver unit 30 and a drive lever 54 for driving the locking bolt 56. The drive lever 54 thus drives the locking bolt 56 by the rotational movement of the actuator 50.In the exemplary embodiment shown, the actuator 50 is of V-shaped design and encloses an angle of approximately 90° between the contact region 52 and the drive lever 54, wherein the rotatable bearing axis is arranged in the region of the points of intersection of the two limbs, the contact region 52 and the drive lever 54.In the embodiment variant shown, the contact region faces the gearwheel 26 and is embodied in a fork shape with two fork prongs 70. The driver unit 30 has a driver pin 72, which is guided between the fork prongs 70 during the movement around the gearwheel 26 and thus drives the actuator 50 during the further movement. In the starting position, i.e. the open position, the fork-shaped contact region is aligned obliquely in the direction of the approaching driver unit 30, so that the driver pin 72 can be guided, so to speak, from above between the fork prongs 70 and, during the return movement, out of them again.The driver unit 30 moves into the end position when the door leaf is closed, thereby driving along the actuator 50, which moves the locking bolt 56 into its locking position. In the end position, the locking unit 28 is in the over-center position, and the locking bolt 56 additionally locks the door leaves.FIG. 7 shows the essential components of the door drive in a perspective illustration. It can be seen that the connecting element 32 has two side parts 42 which are aligned parallel to one another and each extend along the roller chain 24 on one side of the roller chain 24. The side parts 42 are connected to one another via a pivotable connecting pin 44, wherein the connecting pin 44 is arranged on the side of the roller chain 24 opposite the gearwheel 26 and is oriented transversely with respect to the direction of movement of the roller chain 24. In the exemplary embodiment shown, the connecting pin 44 is arranged on the outside of the revolving roller chains 24, the roller chain 24 runs between the two side parts 42 and below the connecting pin 44.For additional stability, the two side parts 42 are connected to one another by means of two further bolts 60 which are arranged parallel to the connecting bolt 44. Depending on the embodiment variant, only a single or a plurality of additional bolts 60 can also be provided.The door connection 33 extends parallel to the roller chain 24 and can be connected to the door leaf via a suitable connection.FIG. 8 shows a detailed view of the driver unit 30, which has a spring lock 62 with flat tabs 64 which are connected to one another via two axles 66.The invention is not limited to the described exemplary embodiments, but rather also comprises further variant embodiments which are covered by the claims.Reference numerals denote reference numerals20 Door drive 22 Motor 24 Roller chain 26 Gearwheel 28 Locking unit 30 Driver unit 32 Connecting element 33 Door connection 34 First pivot bearing 36 Second pivot bearing 38 Recess 40 Holding element 42 Side parts 44 Connecting bolt 50 Actuator 52 Contact region 54 Drive lever 56 Locking bolt 58 Additional locking unit 60 Bolt 62 Spring lock 64 Flat link plates 66 Axles 70 Fork prongs 72 Driver bolt M Center line V Connecting lineReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2014 101 036 A1

[0003]

Claims

Door drive (20) for a door leaf, having - a roller chain (24) driven by a motor (22), - a toothed wheel (26) deflecting the roller chain (24), - a locking unit (28), formed from - a driver unit (30) firmly connected to the roller chain (24), - a door connection (33) for a connection to a door leaf, - a connecting element (32) extending along the roller chain (24), which is mounted with its first end pivotably on the driver unit (30) via a first pivot bearing (34) and with its second opposite end pivotably on the door connection (33) via a second pivot bearing (36), wherein the locking unit (28) is arranged in such a way that in a closed state both pivot bearings (34, 34, 36) are arranged on an identical circumferential half of the gearwheel (26) in an end position on the gearwheel (26) and thus assume an over-center position with respect to one another with respect to a direction of movement of the roller chain (26) into an open position.Door drive (20) according to Claim 1, characterized in that the gearwheel (26) is designed as a drive pinion.Door drive (20) according to Claim 1 or Claim 2, characterized in that the connecting element (32) has, adjacent to the first pivot bearing (34), a recess (38) which, in the closed position of the locking unit (28), bears against a retaining element (40) connected to the gearwheel (26).Door drive (20) according to Claim 3, characterized in that the recess (38) is of semicircular design and the retaining element (40) has a circular outer circumference with diameters corresponding to the recess (38), wherein the connecting element (32) is of angled design in the region of the recess (38) in the direction of the gearwheel (26).Door drive (20) according to one of Claims 1 to 4, characterized in that the connecting element (32) has two side parts (42) which are aligned parallel to one another and each extend along the roller chain (24) on one side of the roller chain (24) and are connected to one another via a pivotable connecting pin (44), wherein the connecting pin (44) is arranged on the side of the roller chain (44) opposite the gearwheel (26) and is aligned transversely with respect to the direction of movement of the roller chain (24) and forms the second pivot bearing (36).Door drive (20) according to one of Claims 1 to 5, characterized in that the first pivot bearing (34) is fastened to at least one chain link (46) of the roller chain (24).Door drive (20) according to Claim 6, characterized in that the first pivot bearing (34) is connected via a spring lock (48) to chain links (46) of the roller chain (24).Door drive (20) according to one of Claims 1 to 7, characterized in that an actuator (50) is arranged so close to the gearwheel (26) that it can be contacted by the driver unit (30) during its movement along the circumference of the gearwheel (26) in the direction of the closed position.Door drive (20) according to Claim 7 or Claim 8, characterized in that the actuator (50) is rotatably mounted, has a contact region (52) for contact with the driver unit (30) and a drive lever (54), wherein the drive lever (54) drives a locking bolt (56) by the rotational movement of the actuator (50).Door drive (20) according to Claim 9, characterized in that the locking bolt (56) forms an additional locking unit (58).Two-wing door with a door drive (20) according to one of Claims 1 to 10, characterized in that two locking units (28) are arranged on a single roller chain (24), which locking units are each connected to another door leaf via their door connection (33).Vehicle with a door drive according to one of Claims 1 to 11.A vehicle having a two-wing door according to claim 12.

Images