EP1929116B1 - Blocking element, particularly for a gate used as a checkpoint - Google Patents

Description

The invention relates to a blocking element, in particular for a passage barrier for people passage control, which consists of two circular sector-shaped blocking wings, which are mounted with its narrow sector inside on a carrier arranged in the housing about a horizontally directed pivot axis and pivoted to a signal, driven by a Drive motor, to release the passage from a passage blocking position fan or telescopically over or are pushed into each other and are apart for renewed blocking of the passage can be pulled apart.

As blocking elements for so-called turnstiles for people passage control are, for example by the DE-PS 28 25 787 , the US 3,478,467 , the FR 2 855 209 A or the DE 44 45 698 C2 Locking units are known which are rotatable about an about 45 ° downwardly inclined axis of rotation and preferably have three inclined to the rotation axis locking arms, of which in the operating position of the turnstile is one in a substantially horizontal, the passage blocking position. With the aid of an unlockable locking mechanism, the locking unit can be released in response to a signal that is limited so that the initially in blocking position located blocking arm moves out of this position and the subsequent blocking arm occupies the blocking position, the passage temporarily released for a person becomes. In various turnstiles of this type has been found that due to the relatively fast rotation they need to perform, a high impact and thus risk of injury especially for children, which can be hit because of their smaller body size of the nachverenden locking arm in the upper part of the body or even on the head. In addition, this type lock units require relatively much space.

Horinzontal or vertically by 90 ° pivotable barriers or barriers trees are mainly known for drive-through barriers for motor vehicles, but came in a correspondingly smaller design even in person locks used. Even with such barriers, the impact force in the respective end position of the barrier means a problem, the more so if a rapid release and then an equally fast, re-blocking of the path is required; It must then be provided at the end of the pivoting movement damping measures to avoid damage. The risk of injury is not excluded here. Also due to the pivotal movement of the barrier boom by 90 °, a correspondingly large space is also claimed.

By the FR 2 849 519 and by www.automaticsystems.com a passage barrier is known in which pivots out of a the passage on one side limiting housing in response to a signal a circular sector-shaped blocking element, thus blocking the passage. This blocking element is articulated approximately at half the height of the housing. This has the consequence that, while the upper portion of the passage can be shut off relatively well, a large gap remains open at the bottom, through which you can easily undermine the lock. The size of this barrier element are set by the desired compact design and even more by the required stability limits.

Also by www.automaticsystems.com a passage barrier is known, the blocking element consists of two circular sector-shaped blocking wings, which are telescopically to enable the passage into one another and together in a lateral housing pushed. The one, outer barrier wing is for this purpose two-walled with a cavity in which it can accommodate the other, inner barrier wing .. The outer barrier wing is pivotable about a pivot axis near the ground, the inner barrier wing is pivotable about a pivot axis lying higher. The passage is thereby already better than in the case of the passage barrier according to FR 2 849 519 locked, due to the higher lying pivot axis of the inner barrier wing but still remains an underflowable gap open. Both barrier wings have a sector arc following guide groove with which the outer barrier wing in the housing, the inner barrier wing in the outer barrier wing can be guided during its pivoting movement. In this case, the barrier wings are subject to these guide grooves a continuous abrasion, the traces of which are already visible after a short operating time to the outside.

Gunnebo Entrance Control AB is known for a passage barrier with two telescopically movable shutter blades. The one, outer barrier wing is driven by an electric motor via a lever gear to its pivotal movement about a lower pivot axis. In the housing an upright metal plate is provided, which has a toothing at its free end. With this gearing is connected to the outer ram wing, semi-circular gear engaged, which is mounted on the higher-lying drive shaft of the other, inner ratchet wing. When the outer ram is driven by the motor pivoted about its pivot axis, the gear rolls on the teeth of the fixed metal plate In doing so, it takes along the inner blocking wing in its movement, so that it is extended out of the outer blocking wing. The gear transmission is very complicated and therefore relatively expensive, while it is prone to failure and not reliable. It is subject to constant wear and causes disturbing noises, especially when a relatively coarse toothing is selected for cost reasons.

The object of the invention is to provide a blocking element of the type mentioned above, which allows a space-saving and lightweight design, with the blocking of the passage in the fullest possible height of the lock housing can be achieved, so an unauthorized passing of the lock is excluded, and which can be avoided as far as possible injury. Despite the desired lightweight, compact design, the necessary stability must be guaranteed in any case. The drive should be as simple and inexpensive as possible in construction, low-wear and smooth.

According to the invention this is achieved in that the two barrier wings are mounted pivotally about a common pivot axis near the bottom and their radius corresponds approximately to the height of the support and the housing and that both blocking vanes are driven by the drive motor, controlled only via a lever system. The drive only via a lever system is very reliable and hardly susceptible to interference, while relatively simple and inexpensive in construction and production. The fact that the poppets are articulated near the ground and their radius is almost equal to the height of the housing, they can paint the passage barrier in almost its entire height and shut off.

The lever system consists of a drive lever and transmission levers. The drive lever has three connection points that lie at the corners of an imaginary, uneven triangle; at the first connection point, the drive lever is fixedly connected to the output shaft of the drive motor, at its second connection point, a first transmission lever is articulated with its one end, which is connected at its other end hinged to the one blocking wing, and at its third connection point is a second transmission lever articulated with its one end, which is connected at its other end hinged to the other barrier wing.

If according to a preferred embodiment, the one, outer barrier wing in a conventional manner consists of two circular sector-shaped side walls which are interconnected by a circle sector corresponding curved outer wall and so form a cavity into which the other, inner barrier wing is telescopically retracted, then two transmission levers may be spaced apart from the second connection point of the drive lever and articulated in parallel with their one ends, hinged at their other ends to one of the side walls of the one outer barrier leaf; the transmission lever connected to the inner blocking wing which can be retracted into the outer blocking wing is articulated to the connecting point of the driving lever which is farther from the output shaft of the drive motor. By this lever system, the blocking wings are rotated clockwise or counterclockwise when the driving lever is driven by the driving motor , forcibly controlled in their case caused pivoting movement and always brush a defined angle.

In the blocking position of the blocking wing, ie in its extended state, take the transmission lever to the drive lever a stretched position and in the release position of the blocking wing, the transmission lever are folded back onto the drive lever.

The drive motor and the lever system are preferably arranged at approximately half the height of the carrier and the blocking vanes, and eyes may be provided on the blocking vanes for articulated connection with the transmission levers. Thus, the arrangement gains overall stability in addition. The drive motor is preferably a brushless DC motor as a direct drive. With this direct drive, short run times of the blocking vanes and quiet operation can be achieved.

The barrier wings may be guided at their pivotal movement at their circular outer surfaces of guide rails. The guide rails give the arrangement an additional stability, so that it is possible to form the barrier wings so that they can coat and block the passage barrier in almost its entire height and thus preclude underrunning the barrier.

Preferably, on the side walls of the outer barrier wing over the outer wall projecting guide rails are provided with which the outer barrier wing on arcuate guide rails which are arranged on the carrier, along, and accordingly is on the in the outer Sperrflügel.einziehbaren, inner barrier wing a projecting guide rail provided on the outer wall, with which this can slide on a arranged on the inner surface of the outer wall of the outer barrier wing, circular arc-shaped guide rail along. This results in a distance between the outer surfaces of the barrier wings and the guide rails, a contact of the outer surfaces with the guide rails is thus excluded so that no friction, no frictional noise, no abrasion and no traces of abrasion can occur.

In a further advantageous embodiment, a circular arc-shaped guide rail is fastened to the carrier, which has a groove on its outer and / or inner arc surface. On the outer barrier wing, a roller or a ball bearing is arranged on a shaft between the wing outer wall and the carrier, which or which engages in the groove of the guide rail; on the circular sector-shaped inside of the outer barrier wing, a further circular arc-shaped guide rail is arranged, which also has a groove into which a roller or a ball bearing engages, which or which is arranged in the rear, upper portion of the inner barrier wing. Also by this type of leadership, the outer barrier wing is guided and supported laterally. Abrasion and abrasion marks on the barrier wing are avoided.

On the drive lever, an extension may be provided, which may abut in the blocking position of the blocking wings on a stop provided on the carrier. Especially in the case of a malfunction, e.g. a power failure, so the movement of the drive lever can be limited.

Advantageously, tensioned between the extension of the drive lever and the carrier, a return spring which pivots in the event of malfunction, such as a power failure, the drive lever so that the blocking wings are placed and held in their passage releasing position, so that an unhindered passing the Lock is possible; This is especially important in a dangerous situation.

In addition, a stop for the blocking wings in their passage-releasing position can be arranged on the carrier. This stop is also preferably used to limit the movement in the event of a malfunction.

The barrier wings are preferably designed in sandwich construction. They may consist of a very light but sturdy foam insert or honeycomb construction, coated or glued on both sides with a thin and light metal plate or plastic plate, which may still be covered with a soft PUR foam. This contributes to a lightweight construction, which, as already mentioned, allows very short running times of the blocking wings of about 0.2sec. The coating of PUR foam protects the inner part of the barrier wings and contributes to the protection of persons due to its softness.

In a turnstile, which has only a blocking wing as a blocking element, a corresponding guide can be provided for this by the carrier is a circular arc-shaped guide rail is attached, which has on its outer and / or inner arc surface a groove into which a roller or a ball bearing engages, which is attached by means of a shaft on the blocking wing.

On the one narrow side of the blocking wing, a bulge can be formed for this purpose, through which the shaft passes, on which the roller or the ball bearing is arranged.

The shaft with the roller or the ball bearing may alternatively be provided on the outer wall of the blocking wing.

Fig. 1

eine perspektivische Ansicht einer bevorzugten Ausführungsform des Sperrelements in seiner den Durchgang sperrenden Ausgangsstellung,

Fig. 2

die Vorderansicht des Sperrelements gemäß Fig. 1 in seiner den Durchgang sperrenden Ausgangstellung,

Fig. 3

die Vorderansicht gemäß Fig. 2 in der den Durchgang freigebenden Stellung des Sperrelements,

Fig. 4

in Perspektive eine Ausführungsform der Führung des Sperrelements,

Fig. 5

die Frontalansicht der Führung gemäß Fig. 4,

Fig. 6

die Seitenansicht der Führung in Richtung des Pfeiles P in Fig. 4 und

Fig. 7

ein Detail A aus Fig. 6.

The invention will be described in more detail below with reference to the attached drawings by way of example; show it:

Fig. 1

a perspective view of a preferred embodiment of the blocking element in its passage blocking the initial position,

Fig. 2

the front view of the locking element according to Fig. 1 in its passage blocking the starting position,

Fig. 3

the front view according to Fig. 2 in the passage releasing position of the barrier element,

Fig. 4

in perspective an embodiment of the guidance of the blocking element,

Fig. 5

the frontal view of the guide according to Fig. 4 .

Fig. 6

the side view of the guide in the direction of arrow P in Fig. 4 and

Fig. 7

a detail A off Fig. 6 ,

On the support wall 1 of an elongated, vertically standing support 2 with a U-shaped cross-section, which is installed in a housing, not shown, a person barrier and in its height almost corresponds to this housing, the blocking element 3 is mounted. It consists of two blocking wings 4, 4 'in the form of circular sectors, which are fan-shaped or telescopically over or telescopically to release the passage (see Fig. 3 ) and to reverse the passage in reverse order ( Fig. 1 and 2 ). At its narrow tapered sector inside the barrier wings 4, 4 'are mounted on the support wall 1 pivotable about a common pivot axis 5 near the bottom of the housing. Both barrier wings 4, 4 'are designed in sandwich construction. A very light, yet stable foam insert, eg made of metal foam or foam of another suitable material, or a honeycomb construction of suitable material is coated on both sides with a thin and light metal layer, such as aluminum, or a plastic layer, such as carbon fiber, or covered with such a metal or plastic plate. These outer layers or plates carry the bearings for the pivot axis 5 and for a lever system described below, which serves to control the movement of the blocking wings 4, 4 '. Outside each barrier wing 4, 4 'is still covered with a soft PU foam, which protects the inner parts and also contributes to the protection of persons because of its softness. The one, outer barrier wing 4 has two sector-shaped side walls 6, which are connected to the sector wide side by an outer wall 15, so that this outer barrier wing 4 includes a cavity into which the other, inner barrier wing 4 'telescopically or fan-like inserted. Preferably, the sector angle of the two blocking vanes 4, 4 'is the same, so that the outer blocking wing 4 exactly covers the inner blocking wing 4' in the folded state.

At approximately half the height of the carrier 2, a drive motor 7 is mounted on the side facing away from the blocking vanes 4, 4 'inside the support wall 1, the output shaft 8 through an opening in the support wall 1 on the side of the blocking wings 4, 4' protrudes. The drive motor 7 is preferably a brushless DC motor as a direct drive, ie without gear. The motor 7 drives the blocking vanes 4, 4 'via a lever system which is fixedly connected on the one hand to the output shaft 8 and on the other hand to the blocking vanes 4, 4' via eyes 9, 9 'provided for them at about half height. The drive lever 10 of this lever system has three connection points defining an imaginary non-equilateral triangle with each other. At the one connection point is the drive lever 10 with the output shaft. 8 connected to the drive motor 7, for example, clamped to it, as in Fig. 1 shown. At this point protrudes from the drive lever 10 from an extending extension 11, with which he can strike at his turn to the blocking movement of the locking wings 4, 4 'if necessary (see below) to a provided on the support 2 stop 12 (see Fig. 1 and 3 ). Opposite to this extension 11 is located on the drive lever 10 at a distance from the first connection point, a second connection point at which two first transmission lever 13 are hinged parallel to each other at one end and spaced so that their respective other end with the respective eye 9 at one of Side walls 6 of the outer barrier wing 4 can be hinged and so the two transmission lever 13 act together in the same sense as a single transmission lever 13 on the outer barrier wing 4. Still a third connection point is provided on the drive lever 10, it holds the first connection point a greater distance than the second connection point and is also offset to the latter at an angle. At this third connection point, a second transmission lever 14 is articulated with its one end, while its other end with the eye 9 'of the inner barrier wing 4' is hingedly connected (see Fig. 2 and 3 ). During its pivoting movement, the blocking vanes 4, 4 'can be guided on guide rails 16, 17 on the outer surfaces of their outer walls 15, 15' running in the shape of a circular arc. For this purpose, two parallel guide rails 16 are arranged on the support wall 1 in almost its entire height spaced, which are arcuately curved according to the outer wall 15 of the outer barrier wing 4; on them, the outer barrier wing 4 can slide in its pivotal movement with the outer surface of its outer wall 15 along. For the inner barrier wing 4 ', a circular arc-shaped guide rail 17 is arranged on the inner surface of the outer wall 15 of the outer barrier wing 4, at the corresponding inner wing 4' with the outer surface of its outer wall 15 'in its pivotal movement in and out of the outer barrier wing 4 can slide along.

According to a preferred embodiment, in order to avoid abrasion and visible traces of abrasion on the outer walls 15, 15 'of the blocking wings 4, 4', on the side walls 6 of the outer blocking wing 4 on the outer wall 15 projecting guide rails 19 are provided with which he to the Guide rails 16 can slide along. Correspondingly, a guide strip 20 projecting over its outer wall 15 'is also attached to the inner blocking wing 4', which in turn can slide along the guide rail 17 in the outer blocking wing 4. Between the respective outer wall 15, 15 'and the respective guide rails 16, 17 remains such a distance (see Fig. 2 ), so that the outer walls 15, 15 'can not come into contact with the guide rails 16, 17 and abrasion is avoided.

The guide rails 16, 17 and guide rails 19, 20 give the arrangement a stability, which allows the locking wings 4, 4 ', as shown, to be sized so that both extend almost over the entire height of the passage barrier or its housing and so spread the delimited passage area in almost full height, ie can shut off.

In the event of a malfunction, such as a power failure, it must be ensured that then the passage remains open and passable without obstruction. For this purpose, a return spring 21 is stretched between the extension 11 of the drive lever 10 and a suitable position on the support 2, in such a case, the blocking wings 4, 4 'via the drive lever 10 in the passage releasing position according to Fig. 3 brings and holds in this position. At the top Area, eg in the upper quarter, the support wall 1, a further stop 18 is also provided, on which the blocking wings 4, 4 'find in this case stop. Also, the aforementioned stop 12 for the extension 11 is provided primarily for limiting the movement in the event of malfunction. But it can also serve as a stop during normal operation, if, for example, as the drive motor 7 is not, as described above, a brushless DC motor but a non-regulated drive, such as a torque motor is used.

The FIGS. 1 and 2 show the blocking element in its passage blocking the starting position. Both barrier wings 4, 4 'are pivoted about their common pivot axis 5 in the passage area of the lock and are at an angle to the carrier 2 and consequently also to the housing, not shown, of the lock. The inner barrier wing 4 'is telescopically pivoted out of the outer barrier wing 4, the angle which it holds to the support 2 is about twice as large as that of the outer barrier wing 4, if both barrier wings 4, 4', as shown, have the same sector angle , The drive lever 10 is counterclockwise, ie rotated in the pivoting direction of the locking wings 4, 4 ', its extension 11 may rest against the stop 12, the return spring 21 is tensioned. As more clearly in the schematic representation of Fig. 2 can be seen, are the transmission lever 13 and 14 in a stretched to the drive lever 10, it extending position. In response to a signal to the drive motor 7 for opening the passage, this rotates about its output shaft 8, the drive lever 10 in a clockwise direction, this the transmission lever 13 and 14 entrains such that they fold back in their articulated connection to the drive lever 10 (see Fig. 3 ) and in turn the two blocking wings 4, 4 ', at the eyes 9, 9' attacking, take along, so that these around their swivel common pivot axis 5 clockwise out of the passage area of the lock and the inner barrier wing 4 'is pulled into the cavity of the outer barrier wing 4, wherein the blocking wings 4, 4' with their guide rails 19, 20 slide along their respective guide rails 16, 17. In their end position releasing the passage, the two blocking wings 4, 4 'are perpendicular in front of the carrier 2, the outer blocking wing 4 can rest against the stop 18, the inner blocking wing 4' is pulled completely into the outer blocking wing 4. To lock the passage again, the drive lever 10 is rotated counterclockwise, the lever system 10, 13, 14 folds up again and leaves the two barrier wings 4, 4 'in their blocking position according to Fig. 1 and 2 .slide.

By the blocking element, as known per se, consists of two or more blocking wings 4, 4 ', which telescope into one another, the passage barrier space-saving, for example, the housing can be built correspondingly narrower than in other known passage barriers. The movement of the blocking vanes 4, 4 ', their pivoting angles are positively controlled guided by the lever system 10, 13, 14, so that hard impacts in the end positions are avoided and thereby the risk of injury to passersby is significantly reduced. By arranged at about half the height of the lock lever system 10, 13, 14 and provided at almost full height guide rails 16, 17 for the blocking wings 4, 4 ', the arrangement receives a high stability, which allows the blocking wings 4, 4' even with the described, lightweight construction to be such that they extend almost over the entire height of the barrier and can brush the Durcligängsbereich almost its entire height. An underrun of the lock is thus almost impossible. The lever system 10, 13, 14 is relatively simple in construction and in its mode of operation, but very reliable and not susceptible to interference. It can be made very smooth and then causes no disturbing noises.

Due to the light but stable construction of the blocking wings 4, 4 'can be achieved together with the mentioned direct drive very short running times (about 0.2sec) of the locking element or the blocking wings 4, 4', and these still move very quietly and are very stable against lateral forces. The arrangement has a very low moment of inertia.

Fig. 4 shows another advantageous embodiment of the leadership of the locking element on the support 2, here the example of a locking element with only a circular sector-shaped blocking wing 4a. On the support wall 1, a circular arc-shaped guide rail 16a is attached, which has a groove 22 on its outer or inner arc surface. On the one narrow side 23 of the blocking wing 4a, a bulge 24 is provided, through which a shaft 25 passes, on which a roller 26 or a ball bearing 26 is arranged, which or which engages in the groove 22 of the guide rail 16a and can roll therein. Also by this guide the locking wing 4a is guided and supported laterally. The single blocking wing 4a is also driven by a drive motor 7 via a lever system consisting of the drive lever 10a and the transmission lever 13a, the drive lever 10a only requiring two connection points in this case, since only one blocking wing 4a is to be moved, one for connection to the output shaft 8 of the drive motor and one for connection to the transmission lever 13 a.

If this type of leadership on a locking element 3 with two blocking wings 4, 4 'according to the Fig. 1 to 3 is transmitted Then, the shaft 25 with the roller 26 or the ball bearing 26 expediently disposed between the outer wall 15 of the outer barrier wing 4 and the support wall 1, that also engagement in the groove 22 of a guide rail 16a and therein a rolling is possible. On the inside, that is, within, the outer barrier wing 4 is then arranged according to another, arcuate guide rail with a groove in its curved inner surface. Accordingly, the inner barrier wing 4 'in the rear, upper portion carries a roller or a ball bearing, which engages in the groove of this guide rail. Thus, the inner barrier wing 4 'on the outer barrier wing 4 and the outer barrier wing 4 are guided on the support wall 1 so that the outer wall 15' of the inner barrier wing 4 'can not come into contact with the guide rail in the outer barrier wing 4' or with its inner wall and that also the outer surface 15 of the outer barrier wing 4 can not come into contact with the guide rail 16a and abrasion is avoided. Also, this type of leadership, as described, contributes to the stability of the entire device.

LIST OF REFERENCE NUMBERS

1

support wall

2

carrier

3

blocking element

4, 4 ', 4a

blocking vane

5

swivel axis

6

side walls

7

drive motor

8th

output shaft

9, 9 '

eyes

10, 10a

drive lever

11

extension

12

attack

13, 13a

first transmission lever

14

second transmission lever

15, 15 '

outer wall

16, 16a

Guide rails outer barrier wing

17

Guide rail inner barrier wing

18

attack

19

Guide strip outer barrier wing

20

Guide strip inner barrier wing

21

return spring

22

groove

23

narrow side

24

bulge

25

wave

26

Roller / ball bearing

Claims (15)

1. Blocking element, particularly for a gate used as a checkpoint, which comprises at least one circle-sector-like blocking vane which is mounted, by way of its tapering sector inner side and such that it can pivot about a horizontally directed pivot axis, on a support which is arranged in a housing and in response to a signal, in a manner driven by a drive motor, can be pivoted from a position which blocks the passage into a position which opens the passage in order to open the passage and back in order to again block the passage,
   characterized in that the blocking vane (4) is mounted close to the floor such that it can pivot about a pivot axis (5) and its radius corresponds approximately to the height of the support (1, 2) and of the housing, and in that the blocking vane (4) can be driven by the drive motor (7) in a manner controlled only by means of a lever system, in that the lever system comprises a drive lever (10a) and at least one transmission lever (13a), in that the drive lever (10a) has at least two connection points and the drive lever (10a) is connected to the output shaft (8) of the drive motor at one of its connection points and is connected to one end of the transmission lever (13a) at its second connection point, and in that the transmission lever (13a) is connected to the blocking vane (4a) by way of its other end.
2. Blocking element according to Claim 1, characterized in that the blocking element (3) comprises two circle-sector-like blocking vanes (4, 4') which, in a manner known per se, can slide one over the other or one into the other in a fan-like or telescopic manner from a position which blocks the passage, in order to open the passage, and can be drawn apart from one another in order to again block the passage, in that the two blocking vanes (4, 4') are mounted, by way of their tapering sector inner side, on the support (1,2) close to the floor such that they can pivot about a common, horizontally directed pivot axis (5), in that the radius of two blocking vanes (4, 4') corresponds approximately to the height of the support (1, 2) and of the housing, and the two blocking vanes (4, 4') can be driven by the drive motor in a manner controlled only by means of a lever system (10, 13, 14), in that the lever system comprises a drive lever (10) and transmission levers (13, 14), in that the drive lever (10) has three connection points which are situated at the corners of an imaginary, irregular triangle, in that the drive lever (10) is firmly connected to the output shaft (8) of the drive motor (7) at the first connection point, in that a first transmission lever (13) is articulated at the second connection point of said drive lever by way of one of its ends, said first transmission lever being connected in an articulated manner to one of the blocking vanes (4) by way of its other end, and in that a second transmission lever (14) is articulated at the third connection point of said drive lever by way of one of its ends, said second transmission lever being connected in an articulated manner to the other blocking vane (4') by way of its other end.
3. Blocking element according to Claim 2, characterized in that one, outer blocking vane (4) comprises, in a manner which is known per se, two circle-sector-like side walls (6) which are connected to one another by a curved outer wall (15), which corresponds to the circle sector, and a cavity is thus formed, into which the other, inner blocking vane (4') can be drawn in a telescopic manner, in that two transmission levers (13) are connected in an articulated, spaced apart and parallel manner by way of one of their ends to the second connection point of the drive lever (10), said transmission levers in each case being articulated on one of the side walls (6) of one, outer blocking vane (4) by way of their other ends, and in that the transmission lever (14) which is connected to the inner blocking vane (4), which can be drawn into the outer blocking vane (4), is articulated at that connection point of the drive lever (10) which is further away from the output shaft (8) of the drive motor (7).
4. Blocking element according to Claim 2 or 3, characterized in that the transmission levers (13, 14) assume an extended position in relation to the drive lever (10) in the blocking position of the blocking vanes (4, 4'), that is to say in the state in which they are drawn apart from one another, and the transmission levers (13, 14) are folded back onto the drive lever (10) in the open position of the blocking vanes (4, 4').
5. Blocking element according to Claim 2, characterized in that the drive motor (7) and the lever system (10, 13, 14) are arranged approximately halfway up the support (1, 2) and the blocking vanes (4, 4'), and eyes (9, 9') for articulated connection to the transmission levers (13, 14) are provided on the blocking vanes (4, 4').
6. Blocking element according to Claim 2, characterized in that the blocking vanes (4, 4') are guided on guide rails (16, 17) at their outer faces (15, 15'), which are in the form of an arc of a circle, during their pivoting movement.
7. Blocking element according to Claim 3, characterized in that guide strips (19), which project beyond the outer wall (15) of the outer blocking vane (4), are provided on the side walls (6) of said outer blocking vane (4), by means of which guide strips the outer blocking vane (4) can slide along guide rails (16), which are formed in the manner of an arc of a circle and are arranged on the support (1, 2), and in that a guide strip (20), which projects beyond the outer wall (15') of the inner blocking vane (4'), is provided on the inner blocking vane (4') which can be drawn into the outer blocking vane (4), by means of which guide strip said inner blocking vane can slide along a guide rail (17) which is in the form of an arc of a circle and is arranged on the inner face of the outer wall (15) of the outer blocking vane (4).
8. Blocking element according to Claim 3, characterized in that a guide rail (16a), which is formed in the manner of an arc of a circle, is arranged on the support wall (1) and has on its outer and/or inner curved surface a groove (22) in which a roller (26) or a ball bearing (26) engages, which roller or ball bearing is fixed to the outer wall (15) of the outer blocking vane (4) by means of a shaft (25), and in that a further guide rail, which is in the form of an arc of a circle, is arranged on the circle-sector-like inner side of the outer blocking vane (4) and likewise has a groove in which a roller or a ball bearing engages, which groove is arranged in the rear, upper region of the inner blocking vane (4').
9. Blocking element according to Claim 2, characterized in that a projection (11) is provided on the drive lever (10), which projection can rest against a stop (12), which is provided on the support (1, 2), in the blocking position of the blocking vanes (4, 4').
10. Blocking element according to Claim 9, characterized in that a return spring (21) is tensioned between the projection (11) of the drive lever (10) and the support (1, 2).
11. Blocking element according to Claim 2, characterized in that a stop (18) for the blocking vanes (4, 4') is arranged on the support (1, 2) in the position of said blocking vanes which opens the passage.
12. Blocking element according to Claim 1 or 2, characterized in that the blocking vanes (4, 4') are of sandwich construction, both sides of a very lightweight, but stable, foam insert or honeycomb structure being coated or provided by adhesive bonding with a thin and lightweight metal plate or plastic plate, and this unit being covered with a soft PUR foam.
13. Blocking element according to Claim 1, characterized in that a guide rail (16a), which is formed in the manner of an arc of a circle, is arranged on the support (1, 2) and has on its outer and/or inner curved surface a groove (22) in which a roller (26) or a ball bearing (26) engages, which roller or ball bearing is fixed to the blocking vane (4a) by means of a shaft (25).
14. Blocking element according to Claim 13, characterized in that a convexity (24) is integrally formed on one narrow side (23) of the blocking vane (4a), the shaft (25) on which the roller (26) or the ball bearing (26) is arranged passing through said convexity.
15. Blocking element according to Claim 13, characterized in that the shaft (25) with the roller (26) or the ball bearing (26) is provided on the outer wall (15) of the blocking vane (4a).

Images