EP1541518B1 - Door drive device for an elevator - Google Patents

Abstract

The lift door operating device for opening and closing a lift car door wing (5) and corresponding shaft door wing has two pivotable adjusting elements (17.1,17.2) and adjustable drive runners (15). A first adjusting element (17.1) or blocking element (22) connected to it has a recess (28) or protrusion radially spaced away from the pivot of the adjusting element and with which interacts a projection (29) of a latch (25) to temporarily block a pivoting movement of the adjusting element in both directions.

Description

The invention relates to an elevator door drive device for opening and closing at least one car door leaf and at least one associated shaft door leaf of a lift, as defined in the claims.

The invention relates to the problem of transmitting the opening and closing movement, generated by a car door drive, of at least one car door leaf to the associated landing door leaf.
An elevator door operator is already off WO-A-03089356 known.

With the patent EP 0 332 841 For example, a door drive apparatus having a coupling mechanism for coupling a car door leaf to an associated landing door wing has become known. The coupling mechanism comprises two parallel to the direction of travel of the elevator car aligned Mitnehmerkufen which are adjustable by a parallelogram with two pivotable about each pivot axis adjusting elements in their mutual distance. If the elevator car is correctly located on a floor level, the two Mitnehmerkufen lie between two on the landing door side by side coupling elements and can be brought laterally to this (spread) to unlock the one hand the shaft door wing and on the other hand, the opening and closing movement of the car door clearance and synchronous to transfer to the cabin door wing. The distance adjustment between the two Mitnehmerkufen takes place by a fixed to the car door frame door drive unit via a linearly acting drive means (eg., By a belt drive), which also causes the opening and closing movements of the cabin door leaf. In this case, the drive means engages via a connected to one of the adjusting elements of the parallelogram pivoting lever on the car door leaf, that by the opening movement of the linear acting drive means, the adjusting elements are pivoted before the start of a door leaf opening movement in a position in which the Mitnehmerkufen are brought to the coupling elements, thereby unlock the shaft door leaf and form said coupling between the car door leaf and the corresponding shaft door leaf.

At the end of a door leaf closing movement, the adjusting elements are pivoted back into a position in which the Mitnehmerkufen are spaced from the coupling elements by the closing movement of the linearly acting drive means, so that the locking of the shaft door panel returns to its locking position. To ensure that the door leaf opening movement begins only when the Mitnehmerkufen fully spread and thus the shaft door leaves are unlocked, a tension spring ensures that the spreading of the Mitnehmerkufen takes place automatically against the resistance of the shaft door unlocking. This has the consequence that at the beginning of the door opening operation, the drive means is driven by the tension spring in the opening direction until the pivot lever is fully swung in the opening direction, and that at the end of the closing operation, d. H. when undoing the spread of the Mitnehmerkufen, the drive means must work against the action of relatively strong tension spring.

From EP 0 332 841 known door drive device has some disadvantages.

In order to ensure that when changing the drive direction from the door leaf opening movement to the closing movement, the adjusting elements are not prematurely swung back due to acceleration forces, ie the Mitnehmerkufen not spaced from the coupling elements, the pivoting back of the arranged between the drive means and one of the pivotable Verstellemente pivot lever prevented by a latch lever. This one has the form a mounted on the door, two-armed, horizontally extending lever. When the door leaf is in its closed position, the first arm of the ratchet lever rests on a support roller attached to the car door frame, and the second arm extends horizontally below a stop cam provided on the pivot lever, via which the drive means to the one adjustment acts. The pawl lever is loaded by a torsion spring with a torque around its fulcrum so that the second arm moves upward when the first arm is no longer supported. When the drive means at the beginning of the door leaf opening movement pivoted the pivot lever with the adjustment in a clockwise direction and thus spread the Mitnehmerkufen and then the car door leaf has opened so far that the attached to him latch lever is no longer supported by the support roller moves second arm of the pawl lever up to the height of the stop cam on the pivot lever and prevents the pivot lever and the adjusting element, zurückzuschwenken.

Before after reversing the drive direction of the door has reached the end of the closing movement, the first arm of the pawl lever is raised by the support roller, the second arm moves downwards and releases the stop cam of the pivot lever, so that the drive means the pivot lever, the adjusting element and the Mitnehmerkufen can move to the starting position, in which the Mitnehmerkufen are spaced from the coupling elements.

The disadvantages of this device are that the latch lever does not lock the pivoting lever and the adjusting element in both pivoting directions and not without play. This can on the one hand have the consequence that the distance between the spread Mitnehmerkufen varies, which can have a negative effect on the unlocking of the shaft doors and the accuracy of the closing of the shaft doors This may result in their interlocking being incorrect and causing a malfunction.

On the other hand, existing play, especially in the case of fast moving and strongly accelerated door leaves, cause disturbing noises.

The present invention has for its object to provide a device of the type described above, which avoids the disadvantages mentioned, d. h., In which the adjusting elements and thus the Mitnehmerkufen are accurately positioned in the driving position and locked free of play in both directions.

According to the invention the object is achieved by the measures specified in claim 1. Advantageous embodiments and further developments of the invention will become apparent from the dependent claims 2 to 10.

The advantages achieved by the invention are essentially to be seen in that a described in the prior art similar elevator door drive device comprises a coupling mechanism in which one of the Mitnehmerkufen moving adjusting elements or a blocking element connected to this one radially spaced from the axis of rotation of the adjusting element Recess or a projection, such as a groove or a nose, with which a complementary shaping cooperates with a pawl to temporarily block a pivotal movement of the adjusting element in both pivoting directions and backlash.

Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

Conveniently, the recess or the projection on the adjusting element or on the blocking element connected thereto and the komlementäre shaping on the pawl are arranged so that they Exactly engage in mutual engagement when the linearly acting drive means has brought the Mitnehmerkufen to a distance before the start of a door leaf opening movement, in which they are brought in the intended manner to the at least one coupling element. Usually, this position causes in addition to the correct movement of the shaft door and their proper unlocking.

According to a preferred embodiment, the elevator door drive device comprises a latch stop connected to the elevator car or to an elevator shaft (eg with a hoistway door frame), on which the catch strikes at the beginning of a last path section of the door leaf closing movement. Thereby, during the passage of this last path portion, the pawl is pivoted so that the blocking of the pivoting movement of the adjusting element is released by the pawl, and wherein pawl and latch stop are shaped and arranged, the relative movement between pawl stop and pawl and thus the acting on the pawl stop acting substantially in the same direction, in which the komaltungsäre formation on the pawl from the recess or from the projection on the adjustment away. This ensures that the pawl can be brought out of engagement with the adjusting element with the least amount of force, and that the position of the door leaf in which the notching takes place can be adjusted simply and precisely, for example by the latch stop having a lockable adjustment screw.

Preferably, the adjustable latch stop is adjusted so that the length of the last path portion of the door leaf closing movement referred to in the previous section is less than 6 mm.
Thanks to the precise Ausklinkmechanik the inventive device, it is possible in the door leaf closing the drive movement On the door wing transmitting swivel lever - hereinafter referred to as swivel and blocking disc - release only very shortly before reaching the absolute closed position of the door to swing back. This can be reliably ensured that the spread position of the Mitnehmerkufen remains intact until the shaft door leaf has reached its closed position so much that the self-acting shaft door lock can engage.

A further advantageous development of the invention consists in that the pawl is a pivotably mounted lever on a component connected to the car door leaf, and that the position of the point of impact of the pawl stop on the pawl between its pivot point and its point of engagement with the adjusting element is selected such that the complementary shape on the pawl, which is engaged with the recess or projection on the adjusting element, moves away from its engaged position in the course of said last path portion of the door leaf closing movement by a distance greater than that of the path section. For a given depth of engagement between the complementary shape of the pawl and the recess or the projection on the adjustment so that the position of the door, in which the Deblockierung the swivel and blocking disc is done and the shaft door coupling is released, move in optimal proximity to the absolute closed position.

In the case of cabin and landing doors, each with at least two centrally-closing door panels and two mounted on each car door coupling mechanisms are according to a particularly interesting embodiment of the invention, the pawls of both coupling mechanisms arranged by one of the ends of one between the two pawls and in the direction of movement of the two leaves displaceable double-latch stop moved away from its engaged position. This device makes it possible, even with minimal last path sections for deblocking the adjustment to work when between cabin door and shaft door greater lateral dislocations occur.

According to a further embodiment of the invention, the elevator door drive device comprises a restraint device which allows a displacement of the closed door leaf upon initiation of a door leaf opening movement, when the adjusting element is pivoted before the start of the door leaf opening movement by the linearly acting drive means almost completely in the position in which the carrier runners are brought to the at least one coupling element. With such a device can be ensured that the door leaf opening movement under all circumstances only begins when the Mitnehmerkufen fully spread and thus the shaft door leaves are unlocked without a strong spring - as mentioned above - must drive the spreading process. The door drive is not driven in this embodiment at the beginning of the opening operation on the drive means by a strong tension spring and does not work at the end of the closing process against this. Motor power and control effort can be reduced.

According to an expedient embodiment, the restraint device comprises a pivotable retaining pawl, which holds the door at the beginning of a door opening operation in its closed position relative to the elevator car until the adjusting element is almost completely pivoted into the position before the door leaf opening movement by the linearly acting drive means in which the carrier runners are brought to the at least one coupling element. The pivotable retaining pawl has the advantage that it can be unlatched in a simple manner by a cam connected to the adjusting element.

An embodiment of the invention is described below with reference to the attached drawing (s) explained. Show it:

Fig. 1A 2 is a view of an elevator car with an elevator door drive device for a side-closing single-wing door, with non-spread entrainment skids;

Fig. 1B the view of an elevator car according Fig. 1A , with spread entrainment skids,

Fig. 2A a view of an elevator car with an elevator door drive device for a centrally closing multi-leaf door, with non-spread Mitnehmerkufen,

Fig. 2B the view according to Fig. 2A , but with spread traction skids.

Fig. 3A a detailed view of the coupling mechanism of the door drive device with the inventive Mitnehmerkufen blocking device, in deblocked position,

Fig. 3B a detailed view of the coupling mechanism according to Fig. 3A with the inventive Mitnehmerkufen-blocking device, in the locked position,

Fig. 3C a detailed view of the coupling mechanisms of a door drive device for a centrally closing multi-leaf door, with a horizontally displaceable double-latch stop,

Fig. 4A an elevator door drive device with the entrainment skid blocking device according to the invention and with a door restraint device in the restraint position,

Fig. 4B the elevator door drive device according to Fig. 4A with the door wing restraint in the release position.

Fig. 1A and 1B schematically show a mounted on an elevator car 1 elevator door drive device 2 for a laterally closing single-wing door. Visible are an elevator car 1 with a Door opening 4, which can be closed by a car door leaf 5. The elevator door drive device 2 is constructed on a door carrier 3 fastened to the elevator car 1. The car door leaf 5 is attached to a suspension trolley 7, which is laterally displaceable along a guide rail 6 fixed to the door support and is moved by a drive unit 8 via a linear acting, revolving drive means 9 between a door leaf open position and a door leaf closed position. As the drive unit 8 may serve an electric motor, which drives with controlled or uncontrolled speed, via a countershaft 10 or directly coupled to a drive pulley 11 of the linearly acting drive means 9. The linearly acting drive means 9 may be a toothed belt, a flat belt, a V-belt or a roller chain.

On the trolley 7, a base plate 13 is fixed, on which a coupling mechanism 14 for transmitting the movement of the car door leaf on a shaft door associated therewith (not visible) is constructed. The coupling mechanism 14 comprises two parallel to the direction of travel of the elevator car aligned Mitnehmerkufen 15, which are mounted on two pivotable about a pivot axis 16 adjusting elements 17.1, 17.2 and are adjustable by pivoting these adjusting elements in their mutual distance, d. H. can take an unspread or a spread position.

At the shaft door leaves all floor doors are two coupling elements 18 - here in the form of coupling rollers - available, which protrude so far into the shaft space next to the Mitnehmerkufen 15 that in the spread state sideways (horizontally) directed forces and movements on the coupling elements 18 and can transfer corresponding landing door wing, if the elevator car 1 is in the range of a floor level. The bay door panels associated with the illustrated car door panels 5 are off For reasons of clarity in all present figures, not visible, and attached to the shaft door panels coupling elements 18 are therefore shown only by means of so-called phantom lines.

The pivoting of the adjusting elements 17.1, 17.2 and thus the adjustment of the distance between the Mitnehmerkufen 15 also takes place by the drive unit 8 via the linearly acting drive means 9. The principle of action of the distance adjustment (spread) is related to Fig. 3A explained.

Fig. 1A shows the position of the coupling mechanism 14 during a travel of the elevator car 1, ie with the cab and landing door wings closed. In this situation, the Mitnehmerkufen 15 take their unspread position, in which they can move in the vertical direction between the adjacent to each other at the shaft door panels coupling elements 18.

Fig. 1B shows the situation in which the elevator car 1 is at the level of a floor opposite a shaft door and the Mitnehmerkufen 15 were spread so that they come into contact with the two coupling elements 18 on the shaft door leaf and in cooperation with these coupling elements 18 a backlash-free coupling form between the car door leaf 5 and the associated shaft door leaf. In the illustrated situation, the drive unit 8 has already partially opened the car door leaf 5 - and with it also the associated shaft door leaf.

Usually takes place at the beginning of the door opening operation by the action of Mitnehmerkufen 15 on at least one of the coupling elements 18 a not further described unlocking the shaft door leaf.

FIGS. 2A and 2B schematically show an elevator door drive device 2 of the type described above with two coupling mechanisms 14 for centrally closing multi-leaf doors. The central-symmetrical movement of the two car door wings 5.1, 5.2 - and thus the two shaft door leaf - is achieved in that the right car door leaf 5.1 with the lower run 9.1 and the left car door leaf 5.2 are connected to the upper run 9.2 of the linearly acting drive means 9 which is moved by the drive unit 8 as needed in the opening or closing direction. The adjustment of the distance between the Mitnehmerkufen takes place in the right and the left cabin door leaf also by the drive unit 8 via the corresponding runs of the drive means 9. The principle of operation of the distance adjustment is related to FIGS. 3A and 3C explained.

FIGS. 3A and 3B show a more detailed view of the coupling mechanism 14 described above FIGS. 3A and 3B will be explained below how the distance between the Mitnehmerkufen 15 adjusted and how their exact position is fixed without play during the door opening and door closing operation.

• zwei Mitnehmerkufen 15,
• zwei zweiarmige Verstellelemente 17.1, 17.2, die an je einer auf der Grundplatte 13 gelagerten Schwenkachse 16 fixiert sind und an je zwei Gelenkstellen 19 je eine Mitnehmerkufe 15 führen,
• eine Spreizfeder 20, die bewirkt, dass die Mitnehmerkufen die Tendenz haben, ihre voneinander gespreizte Stellung einzunehmen,
• eine auf der oberen Schwenkachse 16 befestigte Schwenk- und Blockierscheibe 22, an der das untere Trum 9.1 des Antriebsmittels 9 an der Verbindungsstelle 24 angreift,
• eine auf der Grundplatte 13 schwenkbar gelagerte Klinke 25, die durch eine Klinkenfeder 26 mit der Schwenk- und Blockierscheibe 22 in Eingriff gebracht werden kann,
• ein mit dem Türträger 3 fest verbundener, sich nicht mit dem Türflügel 5 bewegender Klinkenanschlag 27.

As already mentioned, a base plate 13, on which the coupling mechanism 14 for transmitting the movement of the car door leaf is mounted on the shaft door associated therewith (not visible) is mounted on the car door leaf 5 carrying and guided on the guide rail 6 suspension trolley 7. The coupling mechanism 14 essentially comprises the following components:

• two driving skids 15,
• two two-armed adjusting elements 17.1, 17.2, which are fixed to a respective mounted on the base plate 13 pivot axis 16 and each lead to two hinge points 19 Mitnehmerkufe 15,
• a spreading spring 20, which causes the Mitnehmerkufen have a tendency to take their spread apart position,
• a mounted on the upper pivot axis 16 pivoting and blocking disc 22, to which the lower run 9.1 of the drive means 9 at the junction 24 attacks,
• a pawl 25 pivotally mounted on the base plate 13 and engageable by a pawl spring 26 with the pivoting and blocking disc 22,
• a firmly connected to the door carrier 3, not with the door 5 moving latch stop 27th

The coupling mechanism 14 functions as follows:

Before the start of a door leaf opening operation, ie with closed cabin and landing doors, the lower run 9.1 of the linearly acting drive means 9 via the connection point 24 exerts a leftward closing force on the pivoting and blocking disk 22, which causes it on the same pivot axis 16 seated adjustment 17.1 occupies a position in which the Mitnehmerkufen 15 least spaced from each other are (not spread position) and have a sufficient distance to the coupling elements 18 on the landing door wing. The aforementioned closing force act against stops, not shown here, of which one defines the unspread position of the Mitnehmerkufen 15 and a second, the closing movement of the entire
Coupling mechanism 14 limited to the car door leaf 5. A fixed on the door support 3 jack stop 27, against which the coupling mechanism 14 has moved with the pawl 25 in the course of the last path portion of the door leaf closing movement holds the pawl out of engagement with the pivoting and blocking disc.

At the beginning of the door leaf opening operation, the lower run 9.1 of the drive means 9 moves to the right, so that the pivoting and blocking disc 22 begins to rotate with the adjusting elements 17.1, 17.2 in the counterclockwise direction and the Mitnehmerkufen are spread apart. The driving force for this spreading process is at least partially supplied by the mentioned spreading spring, so that In this phase of movement, no significant tensile force is exerted by the drive means 9 on the coupling mechanism 14 and the displaceable car door panel 5 connected thereto. Once the Mitnehmerkufen 15 have reached their fully spread position, the spreading movement is stopped by a not shown here, acting on one of the Mitnehmerkufen stop. The pivotal movement of the pivoting and blocking disc 22 is thereby prevented from pivoting further, in a position in which a present at its periphery groove 28 facing a complementary to this Klinkennase 29 of the pawl 25. Since now the pivoting and blocking disc 22 can not be deflected further, the driving force of the drive means 9 acts on the entire coupling mechanism 14 and thus also on the car door leaf 5, whereby the door leaf opening movement is initiated to the right. In the course of less than 6 mm measuring the first path portion of the door leaf opening movement, the pawl 25 moves away from the latch stop 27, so that the pawl with its pawl nose 29 by the force of the pawl spring 26 engages in the groove 28 of the pivoting and blocking disc 22 and this precise and backlash blocked in the correct spread position of the Mitnehmerkufen, are introduced in the latter to the coupling elements 18. This condition is in Fig. 3B shown. Backlash between the pawl nose 29 and the groove 28 can preferably be achieved in that they engage slightly wedge-shaped in one another.

When the door leaf closing operation moves over the junction 24 with the pivoting and blocking disc 22nd

coupled lower run 9.1 of the drive means 9 to the left.

As in Fig. 3B shown are the pan and lock washer

and with it the adjusting elements 17.1, 17.2 blocked by the pawl 25 free of play in the position in which the Mitnehmerkufen 15 their from each other assume spread position. The driving force therefore acts on the entire coupling mechanism 14 and the car door leaf 5 and moves them in the closing direction (arrow 31). Less than 6 millimeters before the car door leaf 5 has reached its closed position, the pawl 25 encounters the fixed to the stationary door carrier 3, adjustable latch stop 27, whereby the latch stop in the course of this last path portion of the car door closing movement the latch nose 29 of the pawl 25 moved out of the groove 28 of the pivoting and blocking disc 22 and the latter deblocked. The direction in which the catch stop 27 acts on the pawl 25 corresponds largely to the direction in which the pawl nose 29 has to move out of the groove 28. By a suitable choice of the distance between the pivot point of the pawl and the point of application of the latch stop, it can be influenced how large the said last path section of the car door leaf must be in order to effect the deblocking of the pivoting and blocking disc 22. The pivoting and blocking disc is now pivoted by the lower run 9.1 of the drive means 9 in a clockwise direction until the associated adjustment elements 17.1, 17.2 have reached the position in which the Mitnehmerkufen 15 their defined by a stop not shown position with the lowest possible mutual Take distance in which they are spaced from the coupling elements 18. This is again the in Fig. 3A shown starting situation in which the car door leaf 5 as well as the shaft door leaf closed and the elevator car is ready to drive.

Fig. 3C shows an inventive elevator door drive device 2 for centrally closing multi-leaf doors with two coupling mechanisms 14.1, 14.2. Structure and operation of the two each associated with a car door leaf 5.1, 5.2 coupling mechanisms 14.1, 14.2 are identical to the structure and operation of the above-described coupling mechanism 14 for single-leaf doors. The Movement of the first car door leaf 5.1 and the operation of the spreading of attached to this Mitnehmerkufen 15.1 carried by the lower run 9.1 of the drive means 9, and the movement of the second car door leaf 5.2 and the operation of the spreading of the associated Mitnehmerkufen 15.2 carried by the upper run 9.2 of the linearly acting drive means 9. As a result, a central-symmetrical movement of the first and second car and landing door wings is achieved. In elevator operation, the problem may arise that lateral deviations of the cabin center from the respective shaft door center (dislocations) occur. In the case of centrally-closing multi-leaf doors, such a situation results in a first landing door stop defining the closed position of the landing door leaves, which is currently sideways offset laterally relative to the center of the cabin door (in FIG Fig. 3C not visible) reached before the pawl 25.1 of coupled with this shaft door leaf first car door leaf is brought 5.1 by the associated latch stop from their engagement with the pivoting and blocking disc. In this case, the spread of Mitnehmerkufen 15.1 can not be repealed on this cabin door leaves, resulting in a malfunction.

As in Fig. 3C illustrated, this problem is solved in centrally closing multi-leaf doors in that instead of firmly connected to the door support 3 jack stops a double-latch stop 34 is used, which comprises two about its center position sideways freely displaceable, adjustable in their mutual distance stop pieces 37. These stop pieces are located at one end of a stop rod 36 which is guided horizontally displaceable in a mounted on the door support 3 guide member 35. A spring centering 38 ensures that in the unloaded state of the double-latch stopper 34 is automatically centered in a middle position.

In the case of the above-described problem with lateral deviations of the cabin door center of the shaft door center, for example, the corresponding with the not yet at the shaft door central stop second shaft door panel car door leaf 5.2 due to elastic deformation of several involved in the closing process elements by the driving force by a few millimeters closer to the theoretical Center of the cabin door wings pulled when the two blocked by the off-center shaft door central stop first door. The pawl 25.2 of the second car door leaf 5.2 is displaced by the displaceable double pawl stop 34 to a rear limit stop 39.2 and brought out of engagement with the associated pivoting and blocking disc 22.2. Since the second car door leaf 5.2 is used a few millimeters closer than the first to the center of the cabin door leaves, the stop pieces 37.2, 37.1 of the sliding double-latch stop 34 so far in the direction of the. By its abutting stop 39.2 pawl 25.2 of the second car door leaf 5.2 Latch 25.1 of the first car door leaf 5.1 moved that this is moved out of engagement with the associated pivoting and blocking disc 22.1, so that the spread of both Mitnehmerkufen pairs canceled and the door closing process can be terminated correctly.

FIGS. 4A and 4B show a variant of the inventive elevator door drive device 2, wherein the above-described coupling mechanism 14 additionally comprises a retaining device 40, which ensures that at the beginning of the door leaf opening operation, the opening movement of the door can only begin when the adjustment 17.1, 17.2 before Beginning of the door leaf opening movement are pivoted by the linearly acting drive means 9 in the position in which the Mitnehmerkufen are brought to the present on the shaft door panels coupling elements 18.

• eine auf der Grundplatte 13 schwenkbar gelagerte zweiarmige Rückhalteklinke 41, von der mindestens der angetriebene Arm 41.1 in der Ebene der Schwenk- und Blockierscheibe 22 angeordnet ist.
• ein auf dem mit der Aufzugskabine 1 fest verbundenen Türträger 3 fixierter Rückhalteklinken-Anschlag 42
• eine die Rückhalteklinke 41 gegen den Rückhalteklinken-Anschlag 42 vorspannende Druckfeder 43
• die vorstehend beschriebene, durch das linear wirkende Antriebsmittel 9 angetriebene Schwenk- und Blockierscheibe 22, bei der zwecks Betätigung der Rückhalteklinke 41 ein Teil ihrer Peripherie als Nockenscheibe ausgebildet ist.

The restraint device 40 essentially comprises the following components:

• a pivotally mounted on the base plate 13 two-armed retaining pawl 41, of which at least the driven arm 41.1 in the plane of the pivoting and blocking disc 22 is arranged.
• a retaining pawl stop 42 fixed on the door support 3 firmly connected to the elevator car 1
• a compression spring 43 biasing the retaining pawl 41 against the retaining pawl stop 42
• the above-described, driven by the linearly acting drive means 9 pivoting and blocking disc 22, in which for the purpose of actuation of the retaining pawl 41, a part of its periphery is formed as a cam.

Out FIGS. 4A and 4B the operation of the restraint device is easily recognizable. Fig. 4A shows the coupling mechanism 14 in its initial position, in which the drive unit holds the adjusting elements 17.1, 17.2 fixed on the linearly acting drive means 9 in a position in which the Mitnehmerkufen 15 are spaced from the existing on the landing door coupling elements 18 (coupling rollers).

At the beginning of a door opening operation, as described above, from the drive means 9 via the connection point 24 a rightward force on the pivoting and blocking disc 22 is exerted, whereby the adjusting elements 17.1, 17.2 are pivoted counterclockwise so that the Mitnehmerkufen 15 on spread maximum mutual distance and be brought to said coupling elements 18. Only after the spread of the Mitnehmerkufen a play-free coupling between the car door leaf 5 and the corresponding shaft door leaf generates and has caused the unlocking of the shaft door panel, which is transmitted via the drive means 9 to the coupling mechanism 14 the force Actual opening movement of the car door leaf 5 and the shaft door wing set in motion. To ensure this order, ie to release the opening movement of the car door leaf 5 until the spreading of the Mitnehmerkufen is almost complete, the nose is 41.2 of the retaining pawl 41 with the retaining pawl stop 42 until then engaged and blocks the base plate thirteenth Only shortly before the end of the pivoting movement of the adjusting elements 17.1, 17.2, the driven arm 41.1 of the retaining pawl 41 by a present at the periphery of the pivoting and blocking disc 22 diameter paragraph (cam) 45 so pivoted that the nose 41.2 of the retaining pawl 41 is moved away from its engagement with the retaining pawl stop 42. This situation is in Fig. 4B shown. During the entire opening and closing process, the retaining pawl - positioned by the larger peripheral diameter acting on the driven arm 41.1 after the diameter shoulder 45 - remains in the unlatched position. As soon as the car door leaf 5 and with it the corresponding shaft door leaf have reached their closed position again, the pivoting and blocking disk 22 is pivoted back by the drive means 9 in the clockwise direction, whereby the adjusting elements 17.1, 17.2 the Mitnehmerkufen 15 again in their spaced from the coupling elements 18 Move position. Shortly after the start of the return pivoting movement of the driven arm 41.1 of the retaining pawl 41 passes from the peripheral region of the pivoting and blocking disc 22 with the larger diameter over the diameter paragraph 45 to the peripheral area with the smaller diameter, so that the nose 41.2 of the retaining pawl 41 by the compression spring 43rd is again moved into engagement with the retaining pawl stop 42.

Claims (10)

1. Lift door drive device (2) for opening and closing at least one cage door leaf (5) and a corresponding shaft door leaf, comprising:

   - a coupling mechanism (14), which is mounted at the cage door leaf (5) of a lift cage (1), for transmitting the movement of the cage door leaf (5) to the shaft door leaf, wherein the coupling mechanism (14) comprises two entraining runners (15), which are oriented parallel to the travel direction of the lift cage (1) and mounted on two adjusting elements (17.1, 17.2) - which are each pivotable about a respective pivot axis (16) - and thereby adjustable in their mutual spacing and which act on at least one coupling element (18) arranged at the shaft door leaf, and

   - a drive unit (8) which transmits closing and opening movements to the cage door leaf by way of a linearly acting drive means (9), wherein the drive means (9) so engages at the cage door leaf by way of a component of the coupling mechanism (14) that the entraining runners (15) are led up to the coupling element (18) before the start of the door leaf opening movement and are moved back to a setting spaced from the coupling element (18) after the end of the door leaf closing movement,

   characterised in that a first adjusting element (17.1) or a blocking element (22) connected therewith has a recess (28), which is radially spaced from the pivot axis (16) of this adjusting element (17.1), or a projection, with which a shaped portion (29), which is complementary therewith, of a catch (25) co-operates in order to temporarily block a pivot movement of the adjusting elements (17.1, 17.2) in both pivot directions.
2. Lift door drive device (2) according to claim 1, characterised in that the recess (28) or the projection at the first adjusting element (17.1) or at a blocking element (22) connected therewith as well as the shaped portion (29), which is complementary therewith, at the catch (25) are so arranged that they come into precise mutual engagement and produce a blocking of the pivot movement of the adjusting elements (17.1, 17.2) effective in both directions when the linearly acting drive means (9) has before the start of a door leaf opening movement brought the entraining runners (15) to a mutual spacing in which they are led up to the at least one coupling element (18).
3. Lift door drive device (2) according to one of claims 1 and 2, characterised in that it comprises a catch abutment (27), which is fixedly connected with the lift cage (1) and on which the catch (25) impinges at the start of a last travel section of the door leaf closing movement, whereby during covering of this last travel section the blocking of the pivot movement of the adjusting elements (17.1, 17.2) by the catch (25) is cancelled and wherein catch (25) and catch abutment (27) are so shaped and arranged that the abutment force acting on the catch (25) acts approximately in the same direction in which the complementary shaped portion (29) at the catch goes away from the recess (28) or from the projection at the first adjusting element (17.1).
4. Lift door drive device (2) according to claim 3, characterised in that the first adjusting element (17.1) or the blocking element (22), which is connected therewith, the catch and the catch abutment are shaped and arranged that the length of the said last travel section of the door leaf closing movement required for cancelling the blocking of the pivot movement of the adjusting elements (17.1, 17.2) by the catch (25) is less than 6 millimetres.
5. Lift door drive device (2) according to one of claims 3 and 4, characterised in that the catch (25) is a lever pivotably mounted on a component connected with the cage door leaf (5) and that the point of impinging of the catch abutment (27) on the catch is so selected that the complementary shaped portion at the catch, which is disposed in engagement with the recess (28) or the projection at the first adjusting element (17.1) or at the blocking element (22) connected therewith, moves in the course of the said last travel section of the door leaf closing movement away from its engagement position by a travel which is greater than the said last travel section.
6. Lift door drive device (2) according to claim 5, characterised in that the point of impingement of the catch abutment at the catch is so selected that the shaped portion at the catch, which can be brought into engagement with the complementary shaped portion connected with adjusting element, moves in the course of the said last travel section away from its engagement position by two to three times the last travel section.
7. Lift door drive device (2) according to one of the preceding claims, characterised in that in the case of cage and shaft doors each with at least two centrally closing door leaves and two coupling mechanisms (14.1, 14.2) each mounted at a respective one of the cage door leaves (5.1, 5.2) a catch abutment (34), which is arranged between the two catches (25.1, 25.2) of the two coupling mechanisms (14.1, 14.2) and is displaceable in movement direction of the two door leaves, is present and moves by a respective one of its two ends a respective one of the two catches (25.1, 25.2) away from its engagement position with the corresponding first adjusting elements (17.1.1, 17.1.2) or blocking elements (22.1, 22.2).
8. Lift door drive device (2) according to one of the preceding claims, characterised in that it comprises a restraining device (40) which on initiation of a door leaf opening movement enables displacement of the closed cage door leaf (5) only when the adjusting elements (17.1, 17.2) before the start of the door leaf opening movement are pivoted by the linearly acting drive means (9) into the setting in which the entraining runners (15) are led up to the at least one coupling element (18).
9. Lift door drive device (2) according to claim 8, characterised in that the restraining device (40) comprises a pivotable restraining catch (41) which locks the cage door leaf (5) in its closed setting relative to the lift cage (1) and which is so coupled with the adjusting elements (17.1, 17.2) that the locking is cancelled when the adjusting elements (17.1, 17.2) before the start of the door leaf opening movement are pivoted by the linearly acting drive means (9) into the setting in which the entraining runners (15) are led up to the at least one coupling element (18).
10. Lift door drive device (2) according to claim 9, characterised in that the coupling between the adjusting elements (17.1, 17.2) and the restraining catch (41) consists in that there is present at the first adjusting element (17.1) or at a blocking element (22) fixedly connected therewith a cam or diametral offset (45) which moves the restraining catch (41) into its unlocked setting when the adjusting elements (17.1, 17.2) before the start of the door leaf opening movement are pivoted by the linearly acting drive means (9) into the setting in which the entraining runners (15) are led up to the at least one coupling element (18).

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