HK1060871B - Door coupler and locking device - Google Patents

Description

Door coupler and locking device

Technical Field

The present invention relates to a door coupler and a locking device.

Background

In elevators provided with automatic elevator doors, the coupling between the elevator car door and the landing door is generally achieved using door couplers connected to the elevator car door and provided with coupling elements engaging corresponding counter-elements of the landing door. The door coupler and the counter parts are fitted in relation to each other such that when the elevator car is moving past the landing door, the coupling parts of the door coupler pass by the counter parts of the landing door so that the counter parts pass between them. The door coupler engages each of the opposing members when the elevator car is at a landing with both doors being pushed. Thus, when the elevator door is moved by the power device installed to be combined with the elevator door, the landing door also moves. The coupling device often comprises sheet metal blades extending from the landing door coupler to the landing door and forming a vertical slot with its open side facing the landing door. The counter-elements often comprise rollers mounted on the landing door at a position extending from the landing door towards the elevator shaft, the axis of the rollers being perpendicular to the landing door. The door coupler or the elevator car door is provided with a locking device which closes the elevator car door in such a way that it cannot be opened-at least without special measures-unless when the elevator car is close to a landing, i.e. when the elevator car is within the door opening range. The locking system of elevator doors is required to be reliable and durable. The locking of the elevator door should not cause any disturbing noise.

In order to lock the elevator doors in a reliable manner suitable for use in elevator systems, various arrangements are employed. For example, in a locking system operated by a separate electromechanical actuator, the elevator door operation control system requires a specific light system or parallel system to achieve locking and unlocking of the lock. Locking systems operated by electromechanical actuators always involve an additional system cost corresponding to the price of the actuator. There are also mechanically operated locking systems in which the movement of the elevator car or elevator car door is used to generate an actuating force that locks the elevator door. In these systems the elevator shaft is provided with separate contacts and specific markers fixedly mounted in relation to the shaft, one such contact or marker being placed near each landing and used to detect the landing position and/or to control the operation of the lock. When each landing is equipped with these contacts or markers in the shaft, a lot of installation time is required, which in turn means high labour costs.

In many cases, elevator car door locking devices require excessive space, while elevator car doors or elevator door suspensions have to be designed in a manner that depends more or less on the requirements regarding the placement of the locking device.

Specification FI 102673B provides a door coupler having coupling elements actuated by means of a linkage system for engaging a counter element in a landing door and connected to a locking hook, and wherein the amount of actuating force causing the coupling elements to engage the counter elements is taken from the operating means for actuating the doors. Specification FI 102673B also discloses an elevator car door locking device mounted in conjunction with the door coupler and comprising a locking hook having a closed position preventing movement of the elevator car door and a released position allowing movement of the elevator door; and a link device that moves the locking hook from the release position into the closed position and from the closed position into the release position by an urging force. The door coupler actuating force obtained from the operating means for actuating the doors and acting in the opening direction has the effect of pushing the locking hook from the closed position to the release position when the locking hook is in the closed position and the coupling element of the elevator door contacts the counter element, and the actuating force has the effect of pushing the coupling element when the coupling element is not in contact with the counter element.

The solution disclosed in specification FB 102673B is very well suited to be used in the installation of new elevators in this way. In a retrofit installation the original landing door is often left, and therefore the placement of the counter parts can practically avoid the use of door couplers of the type where the coupling parts are placed close to the locking hooks.

Disclosure of Invention

In order to meet the need for a simple, mechanically operated elevator car locking device for an elevator. The device is suitable for use in retrofit installations and is cost effective to manufacture, space efficient, easy to install, quiet in operation and incorporated into a door coupler.

According to a first aspect of the invention, there is provided a door coupler for engagement with a car door of an elevator, said door coupler comprising coupling parts movable via a link means and intended to engage at least one counter part provided on a landing door, said door coupler being associated with a locking hook having a locking position preventing movement of the car door and a release position allowing movement of the car door, the locking hook being allowed to move from the locking position to the release position when the coupling parts contact the counter part, in which door coupler the actuating power for the coupling parts to engage the counter part is derived from an operating means actuating the doors, characterized in that the door coupler comprises a first part comprising at least said coupling parts, and a second part comprising at least said locking hook and a transmission means of the actuating power from the operating means actuating the doors, the first and second portions are mounted separately from each other on the car door or at least mounted so as to be movable therewith, the door coupler comprising a power transmission element between the first and second portions by means of which a link movement occurring in the second portion causes a link movement in the first portion, and a second power transmission element by means of which a link movement occurring in the first portion causes a movement of the locking hook.

Preferably, the door coupler comprises an operating lever which receives, from an external source, an actuating force for releasing the locking hook and moving the coupling element to engage the counter element.

Preferably, the movement of the operating lever for releasing the locking hook and engaging the counter element is a two-stage movement, so that in a first stage one of the coupling elements is used to verify whether the counter element is present within the reach of this coupling element and when the coupling element touches the counter element the locking hook is released and the second stage is made possible, and in a second stage the counter elements are engaged by the coupling elements.

Preferably, the coupling elements comprise two vertical metal blades separated by a gap opening out from the direction of the landing door at least at their upper and lower ends, said blades being bent at their upper and lower ends in a direction away from the gap, and the counter-elements are rollers projecting from the landing door towards the shaft and aligned with the gap between the blades.

According to another aspect of the present invention, there is provided an apparatus for locking an elevator car door in combination with a door coupler, said locking apparatus comprising a locking hook having a locking position preventing movement of the car door and a release position allowing movement of the car door, and a link means actuated by an actuating force, the action of which link means moves the locking hook from the release position to the locking position and from the locking position to the release position by the action of the actuating force, and the actuating force obtained from actuating the operating means of the doors and acting in the opening direction has the effect of moving the locking hook from the locking position to the release position when the locking hook is in the locking position and a coupling part of the door coupler contacts a counter part, and the actuating force has the effect of moving the coupling part when the coupling part is not in contact with the counter part, characterized in that, the door coupling comprises a first part comprising at least coupling parts, and a second part comprising at least said locking hook and transmission means of an actuating force from an operating device actuating the doors, the first part and the second part being mounted on or at least mounted so as to be movable together with the car door at a distance from each other, the door coupling comprising a power transmission between the first part and the second part, by means of which power transmission the movement of the link occurring in the second part causes the movement of the link in the first part, and a second power transmission, by means of which the movement of the link occurring in the first part causes the movement of the locking hook.

Preferably, the linkage comprises a locking lever for moving the locking hook from the release position to the lock position and from the lock position to the release position, said locking lever being spring-loaded, the latter urging the locking hook towards the lock position.

Preferably, the force generated by the spring acting on the pivot of the link means and keeping this pivot stationary is smaller than the counter force generated by the movement of the link means when the operating lever is rotated in the release direction and the right-hand flap is simultaneously stopped by the right-hand roller.

The advantages obtainable with the application of the present invention include the following:

locking device manufacturing cost savings;

since the locking action is controlled by the operation of the door coupler, i.e. by the presence or absence of a counter-element within the reach of the coupling element, the elevator shaft need not be provided with separate devices or markings to indicate the door zone.

The locking device has a structure that requires little space and is therefore not difficult to install in even narrow structures;

the locking device is easy to install in connection with elevator doors and, since it is mechanically controlled, does not require a separate electrically actuated device;

the door is still locked when outside the floor areas, so that disturbances that may affect the elevator electrical system have no effect on the locking;

in case of a power failure, if the elevator stops between floors, the door will open after the elevator has been moved to a certain floor by manpower;

the device does not generate any additional noise when the elevator is running or the elevator car door is locked or unlocked;

the locking of the elevator car door and its release from the locked state depend on both the opening and closing of the door, both due to timing and via a mechanical coupling;

the invention is particularly well suited for use in retrofit installations where the door coupler has been placed a certain distance away from the elevator car door lock in advance. In this case, the present invention does not require changing the placement of rollers or the like mounted on landing doors and designed to be engaged by the door coupler.

Drawings

The invention will be explained in more detail below by means of an embodiment with reference to the drawing, in which

Figures 1 and 2 show a prior art door coupler including a locking system when outside a landing zone;

figures 3 and 4 show a prior art door coupler with a locking system when within a landing zone;

FIGS. 5 and 6 show a front view of a door coupler having a locking system in accordance with the present invention;

FIG. 7 shows a side view of the portion shown in FIG. 5;

FIG. 8 shows a top view of the portion shown in FIG. 6;

figures 9a and 9b show a lever for transmitting power and motion between the parts shown in figures 5 and 6.

Detailed Description

In the following, each component is referred to using terms such as left, right, up, down, and the like. These terms refer to directions in the figures, as well as clockwise and counterclockwise.

The prior art door coupler 4 with lock and its operation will now be described with reference to fig. 1-4. Fig. 1 and 2 illustrate the situation in which the elevator car is outside the landing zone, which means that the slats 14 and 15 of the door coupler cannot contact the rollers serving as counter-parts on the landing doors. Fig. 3 and 4 illustrate the elevator car in a landing zone where the vanes 14, 15 engage rollers 17, 18 on the landing doors when the doors are opened. The door coupler 4 is fitted on the elevator car door suspension panel 1. The elevator car door suspension panel 1 is provided with supporting rollers and usually also counter rollers which guide the door along guide rails attached to a supporting roof beam mounted on the elevator car, or along some other suitable guide surface on the supporting roof beam. Thus, the door is suspended from a supporting roof beam, supported on this beam by one or more suspension plates. The door coupler vanes 14 and 15, between which landing door rollers 17 and 18 (not shown in fig. 4) engage when the door coupler grips the landing door, are attached to the linkage 2 actuated by the elevator car door operating mechanism. A locking hook 10 that locks the elevator car door is also connected to the link gear 2. The locking hook is latched to a door catch that is stationary relative to the elevator car, such as a door catch provided on a supporting roof beam, or it may be latched to a door panel that moves in the opposite direction. The elevator car door operating mechanism opens and closes the elevator car door. It can also open and close landing doors that are coupled to elevator car doors via door couplers. The operating means is for example a rope pulling system arranged to act in the opening and closing movement direction of the door and attached to the door coupler 4. Instead of the rope pulling means, the operating means may also comprise any other drive means, such as a hydraulic cylinder, to provide an actuating force acting substantially in the direction of movement of the door. In fact, the doors are actuated by means of door couplers. The rope pulling means is connected to the link means 2 via a fixed point 3 on an operating lever 5. Due to the action of the rope pulling means, the operating lever 5 tends to rotate within the limits of its range of motion about a pivot 6 that is stationary relative to the door coupler 4 (and the suspension plate 1 that serves as a base for the door coupler mounting) in a direction determined by the rope pulling means. The operating lever 5 is pivotably connected to the suspension plate 1 via a pivot 6. The movement of the operating lever 5 relative to the pivot 6 creates a suitable movement of both the locking hook 10 and the blades 14 and 15 via the link means 2. Whether the movement is appropriate in the present case depends on whether the elevator is in the door zone or not. The presence of the elevator car in the door zone is identified by the presence of the landing door rollers in the gap between the vanes 14 and 15. Thus, the height of the gap between the louvers 14 and 15 should be substantially the same as the height of the door zone.

Fig. 1 shows the closing and opening arrows drawn from the fixing point 3. The close arrow indicates the direction in which the cable pulling device pulls the door closed (to the left in the figure), and the open arrow indicates the direction in which the cable pulling device pulls the door open (to the right in the figure). The closing arrow also indicates the closing direction of the door, while the opening arrow indicates the opening direction of the door. Fig. 1 illustrates a sector 6a at the pivot 6 to show the angle through which the operating lever 5 rotates clockwise about the pivot 6 when forced by the rope pulling means to open the door. The rotation of some other parts 7, 8, 9 due to the rotation of the operating lever 5 is shown by the sectors 7a, 8a, 9a drawn on top of these parts. Said parts 7, 8, 9 of the link arrangement rotate about respective pivots 7b, 8b, 9b which are stationary relative to the door coupler. These pivots 7b, 8b, 9b, which are stationary with respect to the door coupler, are indicated in the figures by solid circles (with filled-in black parts). The filled circles are also used to indicate other pivot and fixing points which are not fixed relative to the door coupler. The open circles (without filled-in portions) indicate some pivots and fixed points that may move with the linkage. Fig. 2 shows the positions that the components of the linkage 2, the door coupler leaves 14 and 15 and the locking hook 10 occupy, respectively, as a result of the movement of the linkage caused by the action of the actuating lever.

In the following we will examine the way in which the kinematic effect caused by the rotation of the actuating lever 5 through the sector 6a develops in the linkage 2. The operating lever 5 is connected to the linkage at three movable pivots 5x, 5y and 5 z. Below the operating lever 5 there is a support bar 21 which is pivotably mounted on a stationary pivot 21a and is provided with movable pivots 21x and 21 y. The lever arm between pivots 21a and 21x is of equal length to the lever arm between pivots 6 and 5 x. Likewise, the lever arm between pivots 21a and 21y is of equal length to the lever arm between pivots 6 and 5 y. The left vane 14 is connected to the operating lever 5 and the support lever 21 via pivots 5x and 21 x. A synchronizing lever 16 is connected to the operating lever 5 and the support lever 21 via pivots 5y and 21y such that the pivots 5x, 21x, 5y and 12y constitute the corner points of the parallelogram. Thus, the left vane 14 and the synchronizing bar 16 are parallel to each other, while likewise the two lever arms between the pivots 21a and 21x and between 6 and 5x and the two lever arms between the pivots 21a and 21y and between 6 and 5y, respectively, are parallel to each other. It can even be said that, in terms of its various movements, the synchronizing lever 16 corresponds to a leaf of the usual door coupler leaf 15 and the leaf 15, which acts as a sliding leaf of the operating lock, is a disengageable surface member of the synchronizing lever 16, which prevents the release of the locking hook 10 when moving away from the vicinity of the middle of the synchronizing lever. The left end of the first lever 22 is connected to the operating lever 5 via a pivot 5z, which connects the operating lever to the upper triangular lever 7. The rod 22 may have a joint 22a between its ends, allowing the rod to bend at this point. The upper triangular lever 7 is mounted on a fixed pivot 7 b. The upper triangular lever is provided with movable pivots 7x, 7z and a fixed point 7y for a pulling spring 23, the right end of the rod 22 being connected to the uppermost pivot 7 z. When the lever 21 is pushed to the right as the operation lever 5 is rotated in the clockwise direction, the triangular lever 7 is rotated counterclockwise. Its clockwise rotation is assisted by a pulling spring 23 which applies a downward pulling force from the right fixing point 7y towards its fixing point 23a on the suspension plate. If the lever 22 does not have an engagement point 22a, the pulling spring 23 is not necessarily required. As the first lever 7 rotates clockwise, it moves the left pivot 7x of the lever 7 upwards, thus exerting an upward pulling force on the right movable pivot 8y of the second lever 8 via the second lever 24, causing the latter lever 8 to rotate counterclockwise about the pivot 8b, so that the left pivot 8x moves to the right. The second lever 24 is connected at a first end to the pivot 7x and at a second end to the pivot 8 y. The pivots 8b, 8x, 8y of the triangular lever 8 are located near the respective corners of the triangular lever 8.

The above description of the action of the various parts of the linkage is in fact applicable both inside and outside the landing zone and this is the result of the operating lever 5 being rotated through an angle corresponding to the sector 6a when the direction of the door control signal, and therefore the direction of the drive force generated by the operating means, changes from the closing direction "closed" to the opening direction "open".

In the following, the situation in which the elevator car is outside the landing zone will be described first by referring to fig. 1 and 2, and then the situation in which the elevator car is inside the landing zone will be described by referring to fig. 3 and 4.

The first end of the third lever 25 is connected to the triangular lever 8 at a pivot 8 x. The third lever 25 is pivotally connected to the right end of the substantially L-shaped locking lever 11 via a pivot shaft 25a between both ends thereof. The locking lever 11 remains substantially stationary. To ensure that the lever will remain stationary, a thrust spring 12 applies upward pressure to the left end of the locking lever, further pressing locking hook 10 into position to lock the door. In the drawing, the springs 12 and 23 are only shown in fig. 1. When the triangular lever 8 moves the first end of the rod 25 together with the pivot 8x to the right, the rod 25 will rotate around the pivot 25a, so that the second end of the straight rod moves to the left and pushes the first suspension rod 27 of the louver 15 to the left via the fourth rod 26 via the pivot 27a between the two ends of the rod 27. The fourth bar 26 is pivotally connected at its first end to the second end of the third bar 25 and at its second end to the pivot 27a of the first suspension bar 27 via a pivot 25 x. The leaf 15 is suspended at the door coupler by means of two suspension rods 27 and 28. The first and second suspension levers 27, 28 are pivotally connected at their first ends via pivots 27x, 28x that are stationary with respect to the suspension plate 1 that forms the basis of the door coupler mounting. By their second ends, the suspension levers 27 and 28 are connected to the paddle 15 via pivots 27y, 28 y. The suspension levers 28 and 28 have equal lengths. The pivots 27y, 28y, 27x and 28x are so arranged relative to each other and to the suspension plate 1 that the blades 15 will remain in a vertical position when the suspension levers 27 and 28 are turning. Thus, when the elevator is outside the landing area, the motion occurring in the linkage will not release the lock but only move the paddle 15 to the left. The leftward movement of the louver is ensured by the action of the thrust spring 12. The force exerted by the thrust spring on the locking lever 11 keeps the pivot 25a stationary while the pivot 25x moves.

Next, with reference to fig. 3 and 4, a case will be described in which the elevator car is within the landing zone and the lock of the elevator car door is released.

Fig. 3 shows the hatched areas, marking the sector 6A which is centered at the pivot 6 to show the angle through which the operating lever 5 is first turned clockwise around the pivot 6 to release the lock, and a sector 6A through which the operating lever 5 is then turned further to cause the door coupler 45 to engage the rollers 17, 18 of the landing door.

In the above manner, the effect of the action of the linkage consists of the pivoting movement of the triangular levers 7 and 8, which is shown by the shaded sectors 7a and 8a drawn on the respective levers. With the right vane 15 contacting the right roller 18 when the elevator is inside the landing zone, some movement of the linkage occurs in a different manner than when the elevator is outside the landing zone. As mentioned above, the roller 18 is a so-called fixed roller, in other words, it is one of the rollers which remains substantially stationary in the horizontal direction relative to the landing door when the door coupler leaf contacts it. The roller 17 is also slightly movable relative to the landing door so that the movement caused by the pressure applied to it by the door coupler leaf 14 can be used to release the lock of the landing door. When the louver 15 is stopped by the roller 18, the louver 15 cannot move leftward. For the function sought, it is important that, as the triangular lever 8 is rotated counterclockwise, the third lever 25 is rotated clockwise about the pivot 25x through an angle indicated by the sector 25A. Fig. 4 shows the positions respectively occupied by the different parts of the linkage 2, the door coupler leaves 14 and 15 and the locking hook 10, due to the movement of the linkage caused by the actuation lever moving over the sector 6 a. The triangular lever 8 is connected to a first end of a third bar 25 via a pivot 8x, the lower end of this straight bar being pivotally mounted on a fourth straight bar, and the pivot 25x at its lower end acting as a fulcrum for its rotation when the triangular lever is rotated to the right by its upper end. Since the right-hand flap 15 and thus the suspension lever 27 are also held stationary, the pivot 25x at the right end of the fourth bar acts as a substantially stationary fulcrum for the rotation of the third straight bar 25. In this case, the action of the thrust spring 12 on the lever 11 is overcome by the supporting force acting indirectly on the pivot 25 x. Thus, the pivot between the ends of the third straight lever, which is fitted with the L-shaped locking lever 11, is pulled rightwards a sufficient distance. The movement of the locking lever 11 pulls the locking hook 10 to the released position, allowing the elevator car door to be opened. At the same time, the safety switch 13 provided in connection with the locking hook 10 is also opened, said switch outputting an electrical signal to the elevator safety circuit and, if necessary, to the elevator control system, indicating whether the elevator car door is locked or not. After the locking has been released, the operating lever can be rotated further through a sector 6A as shown in fig. 3, and this rotation of the operating lever moves the right door coupler leaf against the right roller 17 of the landing door and finally the rollers 17, 18 of the landing door are squeezed between the door coupler leaves 14 and 15, with the result that the landing door and the elevator car door are completely coupled together. The operating lever can be moved freely and without hindrance over the sector 6A, because the rod 22 is provided with an abutment 22a where the rod can be bent over, so that this bending of the straight rod 22 substantially completely absorbs the action exerted in the direction of the triangular lever 7 after the locking has been released.

Figures 5, 6, 7, 8 and 9 illustrate a door coupler with a locking system and some components thereof consistent with the present invention. The basic principle regarding the operation of such a door coupler is similar, although not in all respects identical, to that of the prior art door coupler illustrated in figures 1, 2, 3 and 4. The device of the invention differs from the prior art devices in its structural aspect firstly in that the elements 105 provided in the first part 101 and intended to engage or reach the rollers or other corresponding counter-elements of the landing door mounted on the landing door are separate in arrangement from the locking and actuating force input functions provided in the second part 102 at the upper part of the elevator car door. This separation can be implemented e.g. by arranging the locking and actuating force input functions on the elevator door suspension plate, whereas the functions for coupling/accessing the counter parts of the landing doors are arranged on the car surface at the location determined by the arrangement of the counter parts on the landing doors. Forces are transmitted between these parts 101, 102 by the rods 103, 104.

The structure and operation of the device according to the invention will be explained below with the aid of the illustrations provided in fig. 5, 6, 7, 8 and 9, taking into account the functional and structural characteristics of the invention, where applicable, using the solution disclosed in technical description FI 102673.

The system comprises the following steps:

a movable locking paddle (included in the door coupler) with a locking mechanism verifies whether the elevator has a landing door locking system with locking rollers. In a locked situation, limited opening is possible (when the elevator car stops between floors).

And (3) verification steps:

1. the elevator car is moving between floors with the defined hook in the locked position, e.g. power interruption to the elevator car door operator:

by means of the action of the spring system included in the structure, the movable (checking) vane starts to move towards the "closed" position of the door coupler (because the power supply to the motor of the elevator car door operator is still interrupted) and, since no landing door locking roller is present on the opposite landing side, the vane can move over the entire permitted distance and it keeps the delimiting hook locked until the next floor is reached (the next landing), where the spring-loaded vane is pushed back when it touches the landing door locking roller, releasing the delimiting hook, so that the elevator car door can be opened from inside the elevator car by manual force.

2. The elevator car is moving between floors, the elevator is stopped, and the power to the elevator car door operator is switched on:

since the power to the motor of the elevator car door operator is on, the spring-loaded movable leaf cannot go out (it remains in the recessed position when the power in the door operator is on), so it holds the limit hook in the locked position;

when the "close" command (from the controller) is active, the elevator car doors are not manually movable from inside the elevator car (a requirement not prescribed by the operating regulations);

when no "close" command is active, the elevator car door can be opened by manual force from inside the elevator car a distance of at most two inches (two intermediate open doors) or at most one inch (single and side open two doors).

3. The elevator car stops at the required floor:

the controller receives an "on" signal from the controller, the motor starts to actuate the door coupler mechanism in which the stopper mechanism is included, the movable leaf performing its "closing" movement first; because of the presence of the landing door locking roller, this blade touches the fixed locking roller, so it cannot move forward, it stops moving; but due to the spring-loaded action the restricting hook is released, thereby releasing the locking of the door; thus, as the elevator car door operator continues to operate, the elevator car doors and landing doors are electrically opened.

4. After the elevator car doors and landing doors have been fully closed:

the "close" command from the controller is active, the door coupler starts to move the vanes apart by means of the power of the electric motor, the spring-loaded movable vane is also more preloaded and its lock defines a hook, and the detent remains in the locked state as long as this power of the electric motor is active (as is the case when the elevator operates normally with power on in the elevator and elevator car door operator);

the coupling between the elevator car door operator and the landing door defines in an integrated manner a functional lock (allowing a limited opening movement when the elevator car stops between floors).

Description of main parts of the apparatus:

-a bottom plate placed beside the suspension plate and provided with link means for power transmission and integrated locking function for keeping the door coupler leafs at a certain distance during the door movements; and a limit hook equipped with a lever mechanism;

-a push rod mechanism from the power transmission linkage to the vanes of the door coupler and their coupled lever system;

a push rod mechanism from the limit hook and its lever system to the door coupler where the movable locking leaf is located on the door.

It is obvious to the person skilled in the art that different embodiments of the invention are not limited to the examples described above, but that they may be varied within the scope of the invention. For example, instead of power transmission straight rods, other types of power and motion transfer means may be employed, such as chains, wire cables or link systems.

Claims (8)

1. Door coupler for coupling with a car door of an elevator, said door coupler comprising coupling parts (105) movable via a link means and intended to engage at least one counter part provided on a landing door, said door coupler being associated with a locking hook having a locking position preventing movement of the car door and a release position allowing movement of the car door, the locking hook being allowed to move from the locking position to the release position when the coupling parts (105) contact the counter part, in which door coupler the actuating power for engaging the coupling parts with the counter part is derived from an operating means actuating the doors, characterized in that the door coupler comprises a first part (101) comprising at least said coupling parts (105) and a second part (102) comprising at least said locking hook and transmission means of the actuating power from the operating means actuating the doors, the first part (101) and the second part (102) are mounted separately from each other on the car door or at least mounted so as to be movable therewith, the door coupling comprising a power transmission part (104) between the first part (101) and the second part (102), by means of which power transmission part (104) a link movement occurring in the second part causes a link movement in the first part, and a second power transmission part (103) by means of which a link movement occurring in the first part causes a movement of the locking hook.

2. A door coupler according to claim 1, wherein the door coupler comprises an operating lever which receives an actuating force for releasing the locking hook and moving the coupling element to engage the counter element from an external source.

3. Door coupler according to any of the preceding claims, characterized in that the movement of the operating lever for releasing the locking hook and engaging the counter element is a two-stage movement, so that in a first stage one of the coupling elements (105) is used to verify whether the counter element is present within the reach of this coupling element and when the coupling element touches the counter element the locking hook is released and a second stage is made possible, and in a second stage the counter elements are engaged by the coupling elements (105).

4. A door coupler according to claim 1 or 2, characterized in that each coupling element (105) comprises two vertical metal blades separated by a gap opening out from the direction of the landing door at least at their upper and lower ends, said blades being bent at their upper and lower ends in a direction away from the gap, and that each counter element is a roller projecting from the landing door towards the shaft and aligned with the gap between the blades.

5. A door coupler according to claim 3, characterized in that each coupling element (105) comprises two vertical metal blades separated by a gap opening out from the direction of the landing door at least at their upper and lower ends, said blades being bent at their upper and lower ends in a direction away from the gap, and that each counter element is a roller projecting from the landing door towards the shaft and aligned with the gap between the blades.

6. Device for locking an elevator car door in combination with a door coupler, said locking device comprising a locking hook having a locking position preventing movement of the car door and a release position allowing movement of the car door, and a linkage actuated by an actuating force, the action of which linkage moves the locking hook from the release position to the locking position and from the locking position to the release position by the action of the actuating force, and the actuating force, obtained from an operating device actuating the doors and acting in the opening direction, has the effect of moving the locking hook from the locking position to the release position when the locking hook is in the locking position and a coupling part (105) of the door coupler contacts a counter part, and the actuating force has the effect of moving the coupling part when the coupling part is not in contact with the counter part, characterized in that the door coupler comprises a first part (101), comprising at least coupling parts (105), and a second part (102) comprising at least said locking hook and transmission means of the actuating force from the operating means actuating the doors, the first part (101) and the second part (102) being mounted on or at least mounted at a distance from each other so as to be movable together with the car door, the door coupling comprising a power transmission (104) between the first part (101) and the second part (102) by means of which the link motion occurring in the second part causes the link motion in the first part, and a second power transmission (103) by means of which the link motion occurring in the first part causes the motion of the locking hook.

7. A locking arrangement as claimed in claim 6, wherein the linkage comprises a locking lever for moving the locking hook from the release position to the lock position and from the lock position to the release position, said locking lever being spring loaded which urges the locking hook towards the lock position.

8. A locking arrangement as claimed in claim 6 or 7, characterised in that the force generated by the spring acting on the pivot of the link means and keeping it stationary is smaller than the opposing force generated by the movement of the link means when the operating lever is rotated in the release direction and the right-hand flap is simultaneously stopped by the right-hand roller.