EP0075806B1 - Pivoting gate equipment for passageways - Google Patents

Description

The invention relates to a swing door arrangement for passage systems with a non-contact person scanning device for actuating an electromotive swing door drive, in which the bearing of the door leaf, its drive shaft with a swivel gear and the reversible electric motor with an overload protection are arranged within an upright tubular housing anchored to the floor are and a spring-loaded, at a certain torque releasing locking mechanism is provided between a door wing and a part connected to the housing.

Such an arrangement has become known, for example, from DE-U-8 107 649. It is mainly used in self-service shops or other facilities open to the public and is used to control the flow of visitors. The swing doors open the passage when an electric motor, and thus the drive mechanism, is set in motion by an impulse that is triggered by a person, for example when a light beam is passed through or when entering a contact mat. After a certain time, the swing gate then automatically closes the passage.

In the known swing door, it has been shown that the relatively large number of welded connections lead to an enormous welding delay, which has a disadvantageous effect on the parallel position of the individual components necessary for the perfect functioning of the swing door, in particular what the alignment of the individual axes for the motor output shaft, gear drive - And gearbox output shaft affects. Fastening the electric motor to a plate welded to the housing can result in differences in the position of the motor output shaft and the transmission input shaft, which have a damaging effect on the bearings of the shafts mentioned. The same applies to the gearbox located in the pivotable tube and to the storage in the upper housing end. Any damage that occurs can only be remedied after the entire column has been completely removed. In addition, this type of connection makes it difficult to assemble such swing doors.

It has also proven to be disadvantageous that, in order to save the amount of welded connections, certain parts carrying the movable components must be secured from the outside with the outer casing of the lower housing and / or the swivel part by screwing. Due to their shape, commercially available pan-head screws are not able to close the counterbores on the cylindrical outer shells without a transition. Either there are small openings between the screw head and the outer jacket, or areas of the screw heads protrude beyond the boundary of the outer jacket. In both cases, this makes it difficult to clean the hinged doors, which are designed in a chrome-plated, high-gloss version. In addition, the aesthetic effect suffers.

The invention is therefore the task ztigrur _l - de to change and simplify the arrangement of the components in the interior of the pivoting door column so that rapid avoidance of welds allows rapid assembly and disassembly, from the outside at least on the housing and on it coaxial tube of the door wing no fasteners should be visible.

This object is achieved by the characterizing features of claim 1.

A major advantage of the arrangement according to the invention is the preassembly of the drive and transmission parts in a columnar block which can be flanged centering in the housing of the pivoting door column, for which purpose only small flange attachments need to be welded to the inside of the housing, which do not distort welding at the expense of accuracy and smoothness of the drive. Another major advantage of the invention is the considerable ease of assembly when arranging the door leaf on the housing, because the tube of the door leaf only has to be pushed onto the drive shaft and at the same time reaches the rotational connection with the drive shaft via the panic protection, which thus opens easily performs a double function. With the concept according to the invention it is possible to arrange the fastening elements within the door pillar and thus to keep the outer surface free of bores, screws and the like.

With the features of subclaims 2 to 6 it is possible to internally improve the fastening of the housing cap which closes the door pillar upwards on the housing, so that spars can be connected to the housing cap to form a railing, which considerably improves stability.

The swivel gearbox according to subclaims 7 to 11 is characterized by the simplicity of the components, easy assembly and self-locking in the end positions of the door leaf, which prevents the door leaf from swinging, but does not rule out an opening via the panic protection. This panic protection disclosed in subclaims 13 to 16 conveys both the rotational locking of the drive and door leaf in normal operation as well as the violent opening of the door in an emergency without affecting the drive and gear. Your advantage also lies in the fact that it is very easy to get ready for action when the door leaf tube is put on.

Because the use for through systems cylindrical tubes is most appealing, the invention with the teaching of subclaim 17 also offers the solution to ensure particularly reliable detection of passers-by or shopping carts with the aid of the person scanning device in spite of the less favorable reflection possibilities of the light beam.

• Fig. 1 eine perspektivische Ansicht einer mit Schwenktüren versehenen Durchgangsanlage,
• Fig. 2 einen Vertikalschnitt durch einen Türpfosten einer Schwenktüre,
• Fig. 3 einen Horizontalschnitt nach der Linie 111-111 durch den Türpfosten gem. Fig. 2,
• Fi.g.4 eine Schaltung für eine elektrische Steuerung des Schwenkantriebes,
• Fig. 5 und 6 Vorderansicht und Draufsicht einer Personenabtasteinrichtung,
• Fig. 7 bis 9 Längsschnitt und Querschnitte durch eine Paniksicherung und
• Fig. 10 und 11 Teillängsschnitte durch verschiedene Flanschverbindungen für die Gehäusekappe gem. Fig. 2.

Details of the invention are shown schematically and for example in the drawing. It shows

• 1 is a perspective view of a passage system provided with pivoting doors,
• 2 shows a vertical section through a door jamb of a swing door,
• Fig. 3 shows a horizontal section along the line 111-111 through the door jamb. Fig. 2,
• Fig. 4 a circuit for electrical control of the swivel drive,
• 5 and 6 front and top view of a people scanner,
• Fig. 7 to 9 longitudinal section and cross sections through a panic protection and
• 10 and 11 partial longitudinal sections through different flange connections for the housing cap acc. Fig. 2.

In Fig. 1 you can see a passage system, consisting of two opposite pivoting doors 1, the door leaf 5 are arranged in the closed state on a common vertical plane. A contact-free person scanning device in the form of a light barrier 2 is connected to the pivoting doors 1. The passenger guidance system can also be designed such that only one swing door 1 is provided and instead of the second swing door there is a post to which the light barrier 2 can also be fastened. If a person walks in the direction of the arrow through the light beam from the light barrier 2, the door leaves 5 open in the direction of passage and close automatically after a certain time. The pivoting doors 1 can furthermore each have a “panic protection”, which makes it possible, in the event of a panic, to open the door leaves 5 counter to the direction of passage by exerting a certain force. The location and arrangement of the "panic protection" are described later.

In one post 3, a transmission diode 6, which will be described later, is arranged and cooperates with a reflector 7 located in the opposite post 4. The posts 3, 4 are firmly connected via spars 8 to housing caps 9 of the two door posts 10, 11, which have a housing 12 firmly anchored to the floor and a tube 13 rotatably mounted thereon, to which the door leaves 5 are fastened. The housing cap 9 and the housing 12 have a releasable flange connection running through the tube 13. An electric motor with swivel gear as well as the bearing for the door leaf 5 are provided within the housing or the tube 13.

The posts 3, 4 and 10, 11 consist of tubes which are circular in cross-section, on the outer lateral surfaces of which, if possible, no connecting means for the components arranged within the tubes should be recognizable.

FIG. 2 shows the individual swing door 1 according to FIG. 1 in section. It essentially consists of a cylindrical lower housing 12 anchored to the floor, a cylindrical tube 13 connected upwards on the same axis 14 and movable via a swivel gear 15 with a door leaf 5 attached to it, and a housing cap 9 arranged above the tube 13. The inside and outside diameters of the housing 12, the tube 13 and the housing cap 9 are the same size. In the lower area of the housing 12 there is an electric geared motor 16, the output shaft 17 of which is rotationally coupled to a shaft 19, for example by means of a plug connection 18.

A bearing sleeve 20 carries a shell 21 which is connected to the geared motor 16 and is recessed on one side so that the plug connection 18 can be secured against axial movement.

The shaft 19 is guided at a distance from the pivot axis 14 in a bearing sleeve 20 connected to a flange plate 22. An eccentrically arranged on the shaft 19 striving pin 23 carries a deep groove ball bearing 24 which is movable in a horizontally arranged, fork-like link 25 so that the link 25 swings oscillating when the pin 23 and thus the deep groove ball bearing 24 describe a circular path. The link 25 is fastened by means of a horizontally arranged hexagon socket screw 26 which leads into one of four threaded bores 28 arranged in the same plane in a drive shaft 27. Depending on the choice of the threaded bores 28, the pivoting range or the pivoting direction of the door leaf 5 can be changed while the initial position of the link 25 remains the same. This is advantageous in passenger guidance systems with two pivoting doors 1, since in this case the door leaves 5 open and close in opposite directions. The swing doors 1 differ only in the assembled, but not in terms of components. The link 25 is thus secured against rotation at the lower end of the drive shaft 27, so that it performs the same pivoting movement as the link 25. This pivoting movement is transmitted to the tube 13 and to the door leaf 5 arranged on the tube 13 in a manner described later. The drive shaft 27 is supported on two ball bearings 29. Another bearing 30 for the upper end of the drive shaft 27 is located in the housing cap 9, the bearing 30 and the bearing 31 of the drive shaft 27 being detachably screwed together by a web 32. The housing cap 9 thus remains in its intended rigid position when pivoting the door leaf 5, it cannot pivot with it.

A web 33 protrudes inwards from the wall of the tube 13, and the drive shaft 27 is guided in its bore 34. It is also on the Drive shaft 27 a fixedly connected to the tube 13, for example welded hub 35, which contains a panic protection 36 described later. This engages with a latching element 37 in a recess 38 of the drive shaft 27 running along a surface line and thus leads to a rotational connection of the door leaf 5 and its tube 13 with the drive shaft 27.

The entire drive parts 16, 19, 21 with their bearings 20, 21 and 31 are thus arranged or fastened as a columnar structural unit on the flange plate 22, so that this structural unit can be preassembled outside the housing 12. The flange plate 22 is guided in a centered manner on the inner wall of the housing and is screwed onto flange lugs 39, which are welded to the housing 12 in places. In Fig. 2, only one flange shoulder 39 is shown. Other flange approaches are provided at a distance from the bearing sleeve 20.

The tube 13 with the door leaves 5 attached to it can be placed on this structural unit which is now firmly connected to the housing 12, the web 33 and the hub 35 leading on the drive shaft 27. Then the housing cap 9 is pushed with its bearing 30 onto the front pin of the drive shaft 27 and screwed to the bearing 31 via the web 32. The end face of the housing cap 9 has an end cap 40 which can be removed from it and which, when removed, allows free access to the web flange 32. It can thus be seen that the entire door jamb 10, 11 does not need to have any fastening elements visible from the outside and thus does not offer any contact surfaces for corrosion or dust deposits and the like.

The movement of the door leaf 5 continues until the grooved ball bearing 24 arranged on the pin 23, as shown in FIG. 3, runs up against a stop 41, which is expediently formed by a shoulder striving downwards in the middle from the drive shaft 27. In this position, the connecting line A-B, which leads through the central axes of the pin 23 and the drive shaft 27 and the connecting line between B and C, which forms the central axis of the link 25, forms a right angle. In this arrangement, as is known, there is a so-called dead center position, which prevents the link 25 from being able to be moved via the door leaf 5 and the transmission output shaft 27. The door leaf 5 is thus fixed in this position. It is expedient to lock the door leaf 5 in both end positions, that is to say in the open and closed positions, by utilizing the dead center positions. However, it is also conceivable to design the kinematics of the parts in question so that the door leaf 5 is locked by itself only in the closed position. For this purpose, a locking ball 42 is guided in the link 25 and pressed by a leaf spring 43, which acts at a distance from the axis A-B on the circumference of the deep groove ball bearing 24 in a snap-lock manner. The recoil that occurs when the ball bearing 24 strikes the stop 41 is thus absorbed by this locking mechanism 42, 43. The door leaf 5 can therefore not swing.

The shape of the link 25 and the circular path of the pin 23 with grooved ball bearing 24 are structurally matched to one another in the exemplary embodiment so that the pin 23 measures a circular arc path of 270 "in order to thereby cause a pivoting range of the link 25 and the door leaf 5 by 90 °. 1 at the post 3 for the control of the electric motor 16 is somewhat longer than the time in which the link 25 rotates by 90 °. This has the advantage that the link 25 when the ball bearing abuts 24 does not spring back to the stop 41, that is to say does not look up, because the limited further rotation of the output shaft 17 of the electric motor 16 acts on the link 25, which tends to continue the rotation of the link 25 in the intended direction.

The energy released when the ball bearing 24 abuts the stop 41 from the electric motor 16 for the aforementioned limited time is converted into heat in a harmless manner. If the door leaf 5 is stopped during the pivoting process or is pressed against the intended pivoting direction, the electric motor 16 also continues to rotate until it is automatically stopped. It is recommended to use a short-circuit proof electric motor 16.

4 shows in a simplified manner a block diagram of a time relay 44 with a light barrier 2 connected to it. The light barrier 2 has, in a known manner, a control unit 45, a transmission diode 46, a phototransistor 47 as well as an optic 48 and a mirror 49 which detects the optics 48 emitted light rays reflect. The timing relay 44 is electrically and digitally connected to the light barrier 2. This consists of a first timer 50, which initiates the actual control process after receiving an electrical pulse emitted by the light barrier 2. The timing element 50 is followed by both a second timing element 51, which determines the running times of the electric motor 16, and a selection electronics 52 with a triac controller 53, which determines the direction of rotation of the electric motor 16. The windings 54 for right and left rotation of the electric motor 16 are connected to the selection electronics 52 via the triac controller 53. All electronic components that are required to form the light barrier 2 and the timing relay 44 belong to the prior art. They are therefore not described in more detail in their design and circuitry arrangement, which allows many variants, and may be assumed to be known.

When the swing door 1 is not in use, the light beam from the light barrier 2 is not interrupted. The so-called in the "logical 1" state. If, however, the light beam is interrupted, the output 55 goes to "logic 0" and starts the first timer 50, the output 55 of the timer 50 having both its positive and negative edge, the second timer 51, which determines the running times of the electric motor 16 , starts. At the same time, the timer 50 controls the selection electronics 52 statically, which determines the respective running direction of the electric motor 16. The output 56 of the timing element 50 and the output 54 of the timing element 51 are linked with an “AND function”, so that the running time of the electric motor 16 is determined by the output 54 of the timing element 51 and the respective direction of rotation is determined by the output 56 of the timing element 50 . This control of the electric motor 16 takes place by means of triacs 53. The timing elements 50, 51 are constructed in such a way that they can be “retriggered” at all times, ie, even if, for example, half of the operating time of one of the two timing elements 50, 51 has expired, this can be restarted without the logic state at its output 56 or 54 changing until the entire running time of the timing elements 50, 51 has elapsed again.

The mode of operation of the time relay 44 can be described on the basis of a time sequence. The timer 51 should have a running time of 4 seconds, for example. When the timer 51 is started after the time given to the timer 50 via the edge at the output 56, the swing door 1 closes. If a person now interrupts the light beam from the light barrier 2 after 3 seconds, the timer 50 starts the timer via its output 56 51 again, d. that is, an additional 4 seconds (a total of 7 seconds) expire before the output 54 of the timer 51 changes. This is the only way to fully open the swing door. The remaining running time = motor running time of timer 51 of 1 second would not suffice for this.

It should be mentioned that the position of the timing relay 44 in the passenger guidance system is of secondary importance. If the available space permits, the time relay 44 can also be arranged on other static parts than provided in the exemplary embodiment. Likewise, the time relay 44 can be provided in passenger guidance systems whose pivoting doors 1 have, for example, a rectangular or square cross section, since the housing cross-sectional shape of the pivoting doors 1 has no influence on the position or structural design of the time relay 44.

An advantageous embodiment of the light barrier 2 described in FIGS. 1 and 4 results from FIGS. 5 and 6. FIG. 5 shows the two tube posts 3, 4 and a shopping cart 59, which is currently located between the two tube posts 3, 4. An opening 57 is provided in the tubular post 3 shown on the left, through which the light beam 58 generated by a transmitting and receiving unit 6 arranged in the interior of the tubular post 3 passes. A reflector 7 is arranged on the tube post 4 shown on the right, which reflects part of the light emitted by the transmitting and receiving unit 6.

As can be seen in FIG. 5, FIG. 6 illustrates that the light beam 58 emitted by the transmitting and receiving unit 6 is conical and forms a substantially larger area in the region of the reflector 7 than the mirror surface of the reflector 7. It is shown in the drawing very conceivable that usual assembly-related deviations of the tube posts 3, 4 of the transmitting and receiving unit 6 or of the reflector 7 have no effect on the functionality of the light barrier 2. The reflector 7 is normally always in the emitted light cone 58. The light cone 58 itself detects one of the vertical rods located on the wire basket 60 in a known manner when driving through a shopping cart 59 through the passage formed by the tube posts 3, 4, so that on the reflector 7 shading occurs. This shading causes in a known manner the triggering of an electrical pulse in the transmitting and receiving unit 6 for the purpose of automatically opening a door or for operating a counter.

In the exemplary embodiment, the conical. ge light beam 58 generated by a transmitter diode with a light exit angle of about 10 to 15 degrees. A photodiode or a phototransistor is provided as the light receiver. The transmitting diode and the photodiode or the phototransistor essentially together form the transmitting and receiving unit 6. A highly reflective plastic film is provided as the reflector 7. The tube posts 3, 4 usually have a diameter of 60 mm, while the reflector 7 has a dimension of approximately 16 x 100 mm. The distance between the two pipe posts 3, 4 is normally 700 to 1000 mm. The diameter D of the light cone 58 is already at least 120 mm at a distance of 700 mm from the light source. Fig. 2 in only indicated panic protection 36 is described in Figs. 7 to 9 in a specific embodiment. In the partial section of the tube 13, on which the door leaf 5 is located, the upper part of the drive shaft 27 can be seen, which is guided in the hub 35, which is firmly connected to the tube 27.

The hub 35 consists of a vertically arranged cylindrical section 61, which is mounted on the drive shaft 27 and secured against axial movement by two locking rings 62, and a tubular, horizontally arranged section 63, which, with its end striving from the axis of the drive shaft 27, reaches the end Inner wall of the tube 13 is welded. A bolt 64 is located on the same horizontal axis as the section 63, but welded to the tube 13 from the outside. Below the bolt 64 is a second bolt zen 65 attached to the tube 13. The tube 13 can be attached with its two horizontal end sections 66 to the two bolts 64, 65 and fastened in a known manner with releasable securing means. Through the upper bolt 64 and through the wall of the tube 13, an adjusting screw 67 runs centrally and horizontally, which points to a thrust part 68 located in the horizontal section 63 of the hub 35 and abuts against it. In the thrust part 68 there is a bore 69 in the center, into which a pin 70 of the locking element 37 protrudes. An engagement section 71 adjoins the pin 70 of the latching element 37, which engages in a form-fitting manner in the depression 38 provided on the lateral surface of the drive shaft 27, the depression 38 with its longitudinal axis 72 running parallel to the axis of the drive shaft 27. The latching element 37 is pressed under prestress into the recess 38 by means of spring elements in the form of disk springs 73, which are mounted between the thrust piece 68 and the engaging section 71 along the pin 70. Instead of the plate springs 73, a compression spring can also be provided.

If the door leaf 5 is pressed against the opening direction while the pivoting door 1 is closed and locked and the force mentioned above is exerted, the locking element 37 secured against rotation by means of a pin 74 slides out of the recess 38 due to the lever action formed by the door leaf 5, is thereby displaced in the direction of the thrust part 68, the disk springs 73 being compressed somewhat, and can be pivoted with the tube 13 around the drive shaft 27 which is stationary in this state. If you turn the door leaf 5 back into the original position, the latching element 37 snaps back automatically into the recess 38 due to the preload generated by the plate springs 73, so that in this position the tube 13 with the door leaf 5 is driven again via the drive shaft 27 can be. By turning the adjusting screw 67, the plate springs 73 can be more or less compressed by the pushing part 68 and the force or pretension acting on the locking element 37 can thereby be changed. For this purpose, only the door leaf 5 needs to be removed from the bolts 64, 65.

FIG. 8 shows a top view of a preferred embodiment of the recess 38 with the engagement section 71 of the latching element 37. The recess 38 has a trapezoidal cross section, as does the engagement section 71. The inclined surfaces 75 of the recess 38 and of the engagement section 71 lie here to each other. In the example, the depression 38 is approximately 40 mm long along the longitudinal axis 76, so that the two oblique surfaces 75 form a sufficiently large support for the latching element 37 in the depression 38. The surface pressure occurring during the turning process remains within reasonable limits.

A further variant of FIG. 8 is shown in FIG. 9. The cross section of the depression 38 and of the engagement section 71 does not necessarily have to be trapezoidal. Various planar profile surfaces running along the axis of the drive shaft 27 can be provided, which only have to be designed such that no self-locking occurs between the recess 38 and the engagement section 71 of the latching element 37, which also applies to the trapezoidal cross section. In the example, the two lateral surfaces 77 of the depression 38 and of the engagement section 71 are designed in an arc shape and are connected to one another by a flat section 78.

Finally, FIGS. 10 and 11 show variants of FIG. 2, according to which the stand for forming the structural unit that can be inserted into the housing 12 can be designed in various ways in connection with the housing cap 9. According to FIG. 10, the stand consists of a cast block 79, which comprises the bearing 31 and has a projection 80 starting therefrom, on the upper side of which a flange 81 is provided for fastening the bearing 30 for the drive shaft 27 and the housing cap 9. The lower part of the casting block 79, not shown, can have the spatial shape shown in FIG. 2.

Incidentally, the housing cap 9 can accommodate a socket for electrical lighting, it being possible for at least the end cap 40 (FIG. 2) to be transparent.

In the example of FIG. 11, the flange plate 22 and the plate of the housing cap 9 which receives the bearing 30 are connected to one another via a flange tube 82 which has flanges 81 at both ends. The bearing 31 is in this case directly attached to the flange plate 22, for example welded on.

Claims (17)

1. A hinged door arrangement for passage installations having a device which detects a person and acts in a contact-free manner for actuating an alectromotive hinged door drive, in the case of which the mounting (31) of the door leaf (5), its drive shaft (27) with a pivot gear system (15) and the electromotor (16), whose direction of rotation can be reversed and which has an overload safety device, are disposed inside an upright tubular housing (12) anchored on the ground, and a locking mechanism (36), which is under spring pressure (73) and is released at a particular torque, is provided between a part connected to the door leaf (5) and a part connected to the housing (12), characterized in that the mounting (31) for the door leaf (5), its drive shaft (27) with the pivot gear system (15) and the electromotor (16) are disposed as a columnar constructional unit on both sides of a flanged plate (22) which is guided in the stationary housing (12) connected to the ground (12) and is bolted to flange attachments (39); and in that a tube (13), which embraces the constructional unit, is connected to the door leaf (5) and contains the locking mechanism (36) and whose diameter corresponds to the diameter of the housing (12), can be placed over the constructional unit projecting above the housing (12) by guiding on the drive shaft (27); and in that the mounting (31) for the door leaf (5) can be bolted via an internal flange connection (32) to a housing cap (9) sealing the top of the housing column (12, 13).

2. An arrangement as claimed in claim 1, characterized in that the mounting (31) for the door leaf (5) comprises a limited flange arrangement (81) opposite the eccentric pivot drive system (15) for securing on the flanged plate (22).

3. An arrangement as claimed in claim 1 or 2, characterized in that the tube (13) of the door leaf (5) is guided on the drive shaft (27) by means of a crosspiece (33) which partially penetrates the tube (13) and comprises a bore (34), and by means of a hub (35) accommodating the locking mechanism (36).

4. An arrangement as claimed in claim 1 or the following claims, characterized in that the mounting (31) of the door leaf (5) is connected to the housing cap (9) by means of a flanged member (32) which penetrates the intermediate space between the crosspiece (33) and the tube (13).

5. An arrangement as claimed in claim 1 or the following claims, characterized in that the housing cap (9) comprises a sealing hood (40) which can be connected thereto.

6. An arrangement as claimed in claim 5, characterized in that the sealing hood (40) is made of a transparent material, e. g. plastics material, and the housing cap (9) has a mounting for an electric light.

7. An arrangement as claimed in claim 1 or the following claims, characterized in that the pivot drive system (15) for the door leaf (5) consists of a slideblock (25), which is connected in a rotationally rigid manner to the drive shaft (27), is forked and projects radially, and of a roller (24) which is driven by the electromotor (16), is mounted eccentrically with respect to the drive shaft thereof and engages in the slideblock (25).

8. An arrangement as claimed in claim 7, characterized in that the drive shaft (27) comprises a pin-like attachment (41) which projects above the hub of the slideblock (25) and limits the range of movement of the roller (24).

9. An arrangement as claimed in claim 8, characterized in that the diameter of the pin-like attachment (41) is dimensioned such that the stop positions of the roller (24) are at an angle of 90° with respect to one another, in relation to the rotational position of the slideblock (25), in both directions of rotation of the electromotor (16), and form a block in both dead centre positions.

10. An arrangement as claimed in claim 7 or the following claims, characterized in that the slideblock (25) can be secured on the drive shaft (27) in various angular positions, in particular in a division of 90°.

11. An arrangement as claimed in claim 7 or the following claims, characterized in that in its stop position the roller (24) is connected to the slideblock (25) in the manner of a snap closure (42, 43) in order to form a rebound barrier.

12. An arrangement as claimed in claim 1 or one of the following claims, characterized in that the electromotor (16) is formed as a short-circuit- proof geared motor and is provided with an electronic timing relay for controlling the running time and running direction.

13. An arrangement as claimed in claim 1 or one of the following claims, characterized in that the locking mechanism (36) consists of a depression (38), which extends along a surface line of the drive shaft (27) and is approximately wedge-shaped in cross-section, and of a matching, spring-loaded detent element (37) which is guided in the tube (13) of the door leaf (5).

14. An arrangement as claimed in claim 13, characterized in that a radially inwardly projecting hub (35) is rigidly disposed in the tube (13) of the door leaf (5) and comprises a bore (61) for guiding the drive shaft (27) and a bore (63), extending transversely thereto, for guiding the detent element (37) with its pressing spring (73).

15. An arrangement as claimed in claim 14, characterized in that the hub (35) comprises an attachment (64) which projects outwardly over the tube (13) and on which the frame (66) of the door leaf (5) is guided and secured.

16. An arrangement as claimed in claim 13 or the following claims, characterized in that a thrust part (68), which acts on the pressing spring (73), is guided in the transverse bore (63) of the hub (35) and can be adjusted from the exterior by means of a screw (67) and the latter is covered by the frame (64) of the door leaf (5).

17. An arrangement as claimed in claim 1 or one of the following claims, characterized in that the device for detecting a person consists of a transmitting diode (6), which is disposed in a post (3) and generates a wedge-shaped light- beam (58), and of a curved reflector (7) disposed in the opposite post (4).

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