LOCKING UNIT FOR A DOOR LOCKING SYSTEM

Description

[0001] The invention relates to a locking unit for a door locking system, in particular for a multi-point locking system, comprising at least a lock housing that can be mounted on a door leaf, e.g. lock faceplates, a lock chain that can be moved within the lock housing, and at least one latch bolt that can be moved within the lock housing, which has a beveled actuating edge associated with the locking strip and is loaded with a latch spring in the direction of an extended locking position, wherein the latch bolt can be retracted by means of the lock chain from a (fully) extended locking position (i.e. with the door closed) or a partially extended unlocking position (i.e. with the door open) to a (fully) retracted opening position, wherein the latch bolt in the partially extended unlocking position projects beyond the lock housing or the faceplate by an unlocking dimension.

[0002] A locking element may be provided which can be actuated to automatically lock the locking unit in such a way that the latch bolt is automatically moved into the extended locking position.

[0003] Preferably, the lock chain is held in the (neutral) unlocked position by a locking element, wherein the latch bolt is held by the lock chain in its (neutral) unlocked position in the partially extended unlocked position, wherein the locking element can be actuated (e.g. by a release magnet) to automatically lock the locking unit such that the locking element releases the lock chain (into the lowered locking position), so that the latch bolt is automatically moved into the extended locking position.

[0004] Within the scope of the invention, a locking unit refers in particular to an auxiliary lock of a rod lock or also to a central lock of a rod lock. Auxiliary locks on the one hand and the lever-operated and key-operated central lock on the other are connected to each other via rods in a manner known per se, so that during locking, not only the central bolt, for example, arranged in the central lock, but also the locking elements (in particular, latch bolts) arranged in the auxiliary locks are typically disengaged. The invention therefore relates to a self-locking locking unit or a self-locking lock, which in practice is also referred to as an automatic lock. A characteristic of such an automatic lock is the fact that the locking elements, e.g., the latch bolt of the auxiliary lock, automatically move into the locked position when the door is closed.The invention preferably relates to an embodiment with magnetic release, i.e., a release magnet is provided, which is preferably arranged in or on the (frame-side) locking strip. As soon as the door is closed, the locking element in the locking unit moves into the area of ​​the release magnet, thus releasing the lock chain. As the lock chain descends into the locking position, the latch bolt automatically moves into the extended locking position, thus achieving self-locking by magnetic release.

[0005] Such a locking unit is known, for example, from DE 10 2008 011 551 A1. This patent application describes, in particular, an embodiment in which the locking element is designed as a latch bolt, the latch bolt being positively coupled to the lock chain via an intermediate lever. Such an embodiment with magnetic release has proven highly effective in practice, but it is capable of further development. – This is where the invention comes in.

[0006] Furthermore, EP 2 543 804 A2 discloses a rod lock comprising a main lock and at least one secondary lock. The secondary lock contains a locking element that is adjustable between a locked and unlocked position and automatically adjusts to the locked position when the lock or door is moved into the closed position. In addition to the locking element, a conventional latch is provided, which is slidably mounted between an extended and a retracted position. The latch and locking element of the secondary lock each have a recess on the frame into which the locking element of the secondary lock, when in the locked position, or the latch of the secondary lock, when extended, engages in the closed position of the lock.The locking element can be designed, for example, as a swing-hook bolt. The latch is a conventional spring-loaded latch that extends when unloaded. Consequently, when the door closes, the latch's angled surface presses against the frame, pushing it towards its retracted position. The secondary lock's latch is coupled to a transmission element via a pivot lever, such that when the main lock's handle is pulled, causing the drive rod to move, the latch is forced into the retracted position against the force of the spring. When the handle is released, the spring force automatically returns the latch to its extended position.When the door leaf closes, the secondary lock's latch engages in its corresponding recess on the frame, fixing the leaf's position in the area of ​​the secondary lock. This allows the swing bolt to move freely and without friction into the corresponding opening in the frame-side strike plate when the self-engaging locking mechanism is triggered by the leaf's closing motion. Even partial engagement of the latch is sufficient to ensure the desired, defined position of the leaf. The latch is thus mounted independently of the automatic locking mechanism and can extend to its desired position, fixing the leaf in the desired position even before the locking element engages.

[0007] Similarly, EP 2 543 802 A2 describes a lock with a latch and a locking element, and with at least one safety element that is adjustable between a locked position and an unlocked position by means of a magnetic attraction or repulsion force acting on the safety element and a release element on the frame. The locking element is held in the unlocked position by this safety element. Furthermore, the latch, when in its retracted position, is said to hold the locking element in the unlocked position.The automatic locking mechanism is controlled by a dual locking system: first, the locking element in the unlocked position is held in the unlocked position by the locking element in the secured position; and second, the locking element in the unlocked position is held in the unlocked position by the latch in the retracted position. Starting from the open position of the door or similar, the lock employs a two-stage sequence control to trigger the automatic locking mechanism. This is designed to increase the reliability and security of the locking system and effectively prevent incorrect operation. This lock, primarily designed as a central lock within a multi-point locking system, uses a conventional spring-loaded latch.

[0008] Furthermore, EP 2 862 996 A2 discloses a locking device for a door or window, which has a main lock case and at least one secondary or auxiliary lock case, wherein the secondary lock case has a bolt that can be freely retracted in the unlocked position and at least one latch bolt can be moved beyond the latch position into a locking position by a latch spring. The latch bolt forms a locking device for the drive rod, which is forced into a locking position by spring or gravity. However, the self-release is achieved mechanically by special locking and release elements in or on the latch bolt. EP 3 112 564 A1 discloses a locking unit according to the preamble of claim 1.

[0009] Based on the prior art, in particular according to DE 10 2008 011 551 A1, the invention is based on the technical problem of creating a locking unit for a door locking system, in particular for a multi-point locking system, which ensures reliable and functionally safe self-locking, e.g. by magnetic release, while simultaneously providing increased burglary protection.

[0010] To solve this problem, the invention teaches, in a generic locking unit of the type described above, that in addition to the movable latch bolt, a pivotable (about an axis) swing hook bolt is mounted in the lock housing, which, in its pivoted locking position, engages behind the locking strip or the strike plate or an element in or on the locking strip, wherein the swing bolt is only moved into the (fully) pivoted locking position when the door leaf is in the closed position if / as soon as the latch bolt reaches or passes over a partially extended limit position in which the latch bolt projects by a limit dimension (e.g. 13 mm) which is larger than the unlock dimension (e.g. 10 mm) in the unlock position and which is also smaller than the locking dimension (e.g. about 20 mm) which the latch bolt assumes in the extended locking position.

[0011] Optionally, the swing hook bolt is (forcedly) coupled to the lock chain in such a way that it can be moved with the lock chain from a swung-in unlocking position (i.e., lock chain in neutral unlocking position) to a swung-out locking position (i.e., lock chain in lowered locking position) and vice versa.

[0012] The invention is based on the premise that a simple yet tamper-proof self-locking mechanism, e.g., by magnetic release, is advantageous, taking into account a locking element provided in the locking unit that either blocks or releases the independently movable lock chain within the lock case. This eliminates the need for complex mechanical release mechanisms, which in the prior art are, for example, integrated into a latch bolt or implemented by separate release levers. The magnetic self-release is characterized by a high degree of tamper resistance, as manipulation by purely mechanical means is impossible.Based on these considerations, tamper resistance and burglary protection are further increased by providing a pivoting hook bolt in addition to the sliding latch bolt. This is not combined with a simple latch bolt, but rather with another locking element, namely a latch bolt. The combination of these two locking elements ensures a particularly high level of security. The two locking elements—the latch bolt on the one hand and the hook bolt on the other—move into their locking positions, for example, after magnetic release of the locking element.According to the invention, these locking processes are not realized simultaneously, but with a time delay, because the swing hook bolt is only extended once the latch bolt has already been inserted into the strike plate to a certain extent. This ensures that the latch bolt not only locks the door but also pre-centers it, allowing the swing hook bolt to reliably engage the strike plate and engage behind it or any element attached to or within it. However, according to the invention, this pre-centering is not achieved with a simple spring-loaded latch bolt, but with a latch bolt that can assume not only a defined fully extended (anti-return) locking position, but also a defined partially extended (anti-return) unlocking position.This is achieved within the scope of the invention, in particular, by not fully positively engaging or forcibly coupling the latch bolt to the lock chain, so that a certain degree of kinematic movement of the latch bolt is possible even independently of the movement or position of the lock chain. A coupling between the lock chain and the latch bolt is preferably only realized in such a way that the latch bolt can be retracted from the (fully extended) locked position or from the (partially extended unlocked position) to the fully retracted open position by moving the lock chain (in particular by lifting the lock chain). Thus, it is possible, in particular by push-button operation or key operation in the area of ​​the main lock or by a motor drive, to retract the latch bolt via the movement of the lock chain, which is, for example, connected to a drive rod, and to open the lock.Furthermore, the coupling between the lock chain on the one hand and the latch bolt on the other is preferably implemented such that the latch bolt is held in the partially extended unlocked position by the lock chain and the latch lever. During the extension of the latch bolt into the partially or fully extended locking position, there is no assistance from the lock chain; that is, the extension into the locking position does not occur through the displacement of the lock chain, but solely through the force of a latch spring, since the latch bolt is spring-loaded in the closing direction. The coupling of the latch bolt with the lock chain is therefore particularly preferably limited to a coupling in the unlocking or opening direction, i.e., during the lifting of the lock chain.

[0013] This can preferably be achieved structurally by the lock chain being operatively connected to the latch bolt via at least one (pivotally mounted about an axis) latch lever in such a way that the latch bolt can be retracted from the locked position or from the partially extended unlocked position to the fully retracted open position via the latch lever, and that the latch bolt is held in the partially extended unlocked position when the door is open. While, for example, in the prior art according to DE 10 2008 011 551 A1, a positive coupling of the latch bolt to the lock chain is achieved on both sides via a pivotable latch lever or intermediate lever, the coupling with the latch lever according to the invention is designed only on one side, in particular to avoid a synchronous extension of the latch bolt on the one hand and the pivot bolt on the other.

[0014] In a preferred further development, the lock chain is held by the latch bolt after release by the locking element (e.g. as a result of a magnetic release), i.e. blocked against lowering, until the spring-loaded latch bolt reaches the partially extended limit position.

[0015] Such a blocking of the lock chain, extending to the partially extended limit position of the latch bolt, can be achieved through a suitable design of both the lock chain and the latch bolt, so that the latch bolt directly blocks the lock chain. In a preferred embodiment, however, the operative connection between the latch bolt and the lock chain during blocking is achieved via an additional element, e.g., an additional control lever, through which the lock chain is operatively connected to the latch bolt. If the lock chain is released, e.g., after a magnetic release by the locking element, it does not immediately lower completely, but is held by the control lever until the spring-loaded latch bolt reaches its limit position.

[0016] In a particularly preferred embodiment, the latch bolt is thus operatively connected to the lock chain via two elements or two levers, namely on the one hand the latch lever, which is particularly important in the course of unlocking and consequently in the course of raising the lock chain, and on the other hand via the control lever, which is particularly important in the course of lowering the lock chain after an automatic release.

[0017] The control lever can also be equipped as a pivoting lever, which is, for example, mounted to pivot about a horizontal axis. This control lever itself is not spring-loaded. Likewise, it can be advantageous for the latch lever itself not to be directly spring-loaded. However, it is preferred that, on the one hand, the latch bolt is directly spring-loaded, for example by a torsion spring or a comparable spring element that acts on the latch bolt in the extension direction. Furthermore, the lock chain can be directly spring-loaded for gravity assistance; that is, the lock chain is not only forced into the locked position and consequently into the lowered position by gravity, but also by the force of another spring, e.g., a torsion spring.

[0018] The control lever preferably has an end-mounted control cam that acts between the latch bolt on one side and the lock chain on the other. This control cam can be actuated by the latch bolt, for example, by an actuating surface or edge of the latch bolt, and can also act on the lock chain, lifting it. The lock chain itself can have a corresponding control contour upon which the control lever, for example, its control cam, acts. The control contour is designed such that the described blocking function of the lock chain is ensured until the spring-loaded latch bolt reaches its partially extended limit position.

[0019] According to the invention, it is of particular importance that the burglary and manipulation resistance of the locking unit is increased by providing a latch bolt on the one hand and a swing bolt on the other, wherein the latch bolt does not merely perform a latch function, but is itself designed as a locking element.

[0020] According to the invention, the latch bolt is doubly or two-stage secured against being pushed back, not only in the (fully) extended locking position, but also (already) in or from the partially extended limit position, from which point the swing hook bolt also extends. For example, an additional locking element can be provided for the push-back protection in the fully extended locking position, which prevents the latch bolt from being pushed back in this locking position. Additionally, the latch bolt is also (already) pushed back when the latch bolt has been extended to the limit position (or beyond). An additional locking lever can be provided for this purpose. Preferably, however, this push-back protection in the limit position can be implemented using the control lever already described, in conjunction with the lock chain. Reference is made to the description of the figures.In any case, it is in accordance with the invention if a two-stage anti-return mechanism is implemented for both the locked and the limit positions, preferably by the interaction of the latch bolt with the lock chain, e.g., with the interposition of one or more locking elements. In this case, the locking system is characterized by exceptional resistance to manipulation and burglary, because the latch bolt is protected against re-entry even if it does not reach the fully extended locked position, but (only) the partially extended limit position or beyond. The swing hook bolt is (also) provided with an anti-return mechanism, e.g., via a (further) locking element, which may, for example, be designed as a locking lever. One possible embodiment is described in the figure description.

[0021] Of particular importance within the scope of the invention is the additional pivoting hook bolt, which, for example, pivots from the unlocked position to the locked position and vice versa during the movement of the lock chain, so that the pivoting hook bolt is preferably positively coupled to the lock chain in both directions of action. For this purpose, it is advantageous if the lock chain has an actuating section, e.g., an actuating arm or actuating projection, which is coupled to the pivoting hook bolt itself or to an (additional) actuating lever for the pivoting hook bolt. This actuating lever can itself be designed as a pivotable or rotatable lever. It is particularly advantageous if the lock chain is coupled to the pivoting hook bolt via a transmission, preferably a reduction gear, so that the pivoting hook bolt can be pivoted in and out, e.g., over a relatively small stroke of the lock chain.This allows for a swivel angle of 90°. From a design perspective, it is possible, for example, for the aforementioned actuating lever to form a first gear element and for a second gear element to be coupled to the swivel hook bolt (rotatably), or for the swivel hook bolt to have or form a corresponding gear section as a second gear element. These gear elements can be provided with appropriate teeth, so that the reduction gear is preferably designed as a gear transmission.

[0022] However, other designs, and especially gearbox designs, are also possible in principle.

[0023] The invention provides a locking unit, in particular an additional locking mechanism for a bolt lock, which ensures reliable and functionally secure self-locking, preferably based on a magnetic release. Additionally, the locking unit is characterized by an increased degree of tamper and burglary resistance, since (at least) two locking elements are provided: a latch bolt and a swing bolt. The functional reliability of the self-locking mechanism is optimized, in particular, by eliminating the need for a fully forced coupling between the latch bolt and the lock chain, and thus the synchronous movement of these components. The kinematics of the self-locking mechanism are predetermined with respect to the timing, so that the swing bolt only fully pivots out after a certain period of time.This only occurs if the latch bolt has extended sufficiently and pre-centered the door.

[0024] The invention also relates to a rod lock with at least one central lock and at least one additional locking mechanism, wherein, in particular, such an additional locking mechanism is designed in the manner described. Consequently, not only is the locking unit itself protected, but also a rod lock with such a locking unit. Furthermore, a locking assembly is also protected, which consists, on the one hand, of a locking unit (or a rod lock with several locking units) and, on the other hand, of a locking bar associated with the locking unit, wherein the release magnet is arranged in or on this locking bar.

[0025] The invention will now be explained in more detail with reference to a drawing illustrating only one embodiment. The drawing shows... Fig. 1 a rod lock in a highly simplified side view, Fig. 2a an additional locking mechanism of the rod lock according to the invention in an open (perspective) side view in a first functional position ("partially extended unlocking position"), Fig. 2b the additional locking mechanism according to Fig. 2a in a rear view, Fig. 3 the additional locking mechanism according to Fig. 2b in a second functional position ("fully retracted open position"), Fig. 4 the connecting rod lock according to Fig. 2a in a third functional position ("limit position"), Fig. 5 the additional locking mechanism according to Fig. 2a in a fourth functional position ("fully extended locking position") and Fig. 5b the additional locking mechanism according to Fig. 2b in the fourth functional position.

[0026] The figures show a rod lock with multiple locking in the embodiment as a self-locking automatic lock. Fig. 1 Figure 1 shows a rod lock that can be mounted on a door leaf. The locking units 1 and 2 comprise a central lock 1 and upper and lower auxiliary locks 2, which are attached to a (common) lock faceplate 5 on the rear. When the handle is operated and / or the door is closed, the central lock 1 is unlocked, and the auxiliary locks 2 are also released via the rods 6 (which are only indicated). The central lock 1 can include a latch, a central bolt, a follower, and / or a cylinder, as is known per se. Details are not shown. Alternatively, an electric motor drive can be provided for unlocking. This option is also not shown.

[0027] The auxiliary locking devices 2, which can be actuated via the drive rods 6, each have a lock housing 22. A sliding (plate-shaped) lock chain 4 is arranged in the lock housing 22. Furthermore, a latch bolt 3 is provided in the lock housing as the first locking element. This latch bolt is slidable within the lock housing 22 and has a chamfered actuating edge 14 associated with the locking strip 7. It is biased by a latch spring 13 towards an extended locking position. During unlocking via the central lock 1, the associated drive rod 6 acts on the lock chain 4 of the auxiliary locking device 2, which is guided along the lock faceplate 5 and thus slidably in the vertical direction within the lock housing 22 of the auxiliary locking device 2. By means of the lock chain 4, the latch bolt 3 is moved from a (fully) locked position ( Fig. 5a , 5b) into a (fully) locked unlocked position ( Fig. 3 ) transferred and vice versa. While such unlocking is carried out manually or via a motor, for example via the central lock, the locking in the case of the inventive rod lock or the inventive additional locking device 2 takes place automatically as soon as the door or the door leaf comes into the closed position.

[0028] For this purpose, a locking element 9 is provided in the additional locking mechanism 2, which holds the lock chain 4 in the (neutral) unlocked position. A release magnet 10, arranged on the locking strip 7, is associated with this locking element 9. This release magnet 10, located on the locking strip side, acts to automatically lock or release the latch bolt 3 onto the locking element 9, which then releases the lock chain 4, so that the locking element 3 is automatically moved into the locked position. In the exemplary embodiment, the locking element 9 is designed as a linearly displaceable locking pin 9, which is moved in an attractive direction towards the release magnet 10 to unlock the lock chain 4. The release magnet 10 is designed as a permanent magnet.The associated locking element 9 is not itself a permanent magnet, but it is magnetizable and therefore made of a ferromagnetic material, so that it is attracted by the release magnet 10. The lock chain 4 itself is held in the (neutral) unlocked position by gravity on the one hand and by a locking spring 38 on the other. Fig. 2a , 2b ) into the lowered locking position ( Fig. 5a , 5b ) transferable as soon as the release magnet moves the locking pin 9 and this releases the lock chain 4.

[0029] In addition to the already described latch bolt 3, a pivoting hook bolt 25, which can be pivoted about a (vertical) axis 26, is mounted in the lock housing 22. In its pivoted locking position, this bolt engages in a recess in the strike plate and engages behind the strike plate 7. This additional pivoting hook bolt 25 increases the tamper and burglary resistance of the locking unit. This pivoting hook bolt 25 is positively coupled to the lock chain 4 in such a way that it can be moved with the lock chain 4 from a pivoted unlocked position (in which the lock chain is in the neutral unlocked position) to a pivoted locked position (in which the lock chain is in the lowered locking position) and vice versa.Following magnetic release during the self-locking mechanism, both the latch bolt 3 and the swing hook bolt 25 extend into their respective locking positions. The design is such that, when the door leaf is in the closed position, the swing bolt 25 is immediately moved into the extended locking position if, or as soon as, the latch bolt 3 reaches a partially extended limit position ( Fig. 4 ) is achieved in which the latch bolt projects by a limit dimension M2, which is larger than the unlocking dimension M1 in the unlocked position and also smaller than the locking dimension M3 in the fully extended locked position. This operating principle according to the invention is explained below with reference to the figures:

[0030] The Fig. 2a and 2bThe auxiliary locking mechanism 2 is shown from opposite directions, in an unlocked position with the door open. The swing hook bolt 25 is therefore in the pivoted unlocked position, and the latch bolt 3 is in the partially extended unlocked position. The lock chain 4 is in the neutral unlocked position. It can be seen that a guide pin 40 located on the lock housing 22 engages in an elongated hole 41 in the lock chain 4 such that the lock chain 4 moves from this neutral unlocked position according to Fig. 2a , 2b The latch bolt 3 can be moved a certain amount in both vertical directions and consequently either raised or lowered. It projects beyond the lock housing 22 or the lock faceplate 5 by the unlocking dimension M1. In this embodiment, this unlocking dimension M1 is approximately 10 mm.

[0031] Starting from this unlocking position ( Fig. 2a , 2b ), in which the latch bolt 3 is not secured against retraction, there is now the possibility of retracting the latch bolt 3 further, for example by lifting the drive rod 6 and thus also the lock chain 4 during a lever handle operation (cf. Fig. 3 It can be seen that the latch bolt 3 is fully retracted and consequently drawn to the retracted opening dimension M0 of approximately 0 mm. For this purpose, the latch bolt 3 is operatively connected to the lock chain 4 via a latch lever 12, which, in the exemplary embodiment, is designed as an L-shaped lever (pivoting about a horizontal axis 15) and has a first arm 12a associated with the lock chain 4 and a second arm 12b associated with the latch bolt 3. An actuating cam or pin 17 is arranged on the lock chain 4, which pushes the first arm 12a of the lever 12 upwards. The second arm 12b thus acts on an actuating cam 3b which is arranged on a bolt extension 3a of the latch bolt 3, so that the latch bolt 3 (guided in the bolt guide sleeve 18) is retracted into the retracted open position (cf. Fig. 3 After releasing the trigger, the lock chain 4 drops back into place. Fig. 2a , 2bThe neutral position shown, so that the latch bolt 3 again assumes the partially extended (not back-locked) unlocking position. Further lowering of the lock chain 4 is prevented by the locking pin 9, which engages a locking edge 11 on the lock chain 4. In this neutral position of the lock chain 4, the latch bolt 3 is held in the partially extended unlocking position by the latch lever 12 ( Fig. 2a , 2b ).

[0032] If the door is now moved from its current position to... Fig. 2a , 2bWhen closed, the additional locking mechanism approaches the locking bar 7, triggering the magnet 10 to initiate the automatic locking action. First, the latch bolt 3, due to its beveled actuation surface or latch angle 14, is pushed back into the lock housing 22 upon contact with the locking bar 7. This slightly lifts the lock chain 4. However, this lifting is not achieved via a coupling using the latch lever 12, but rather via the additional control lever 27. That is, the actuating edge 30 presses on the lock chain 4 via the control lever 27 (which pivots about the axis 28), lifting it slightly. This lifting of the lock chain 4 releases the (positive-locking and / or friction-locking) contact between the locking pin 9 and the locking edge 11 or any undercut provided there.In this operating position, the release magnet 10, located on the strike plate 7, also moves close to the locking pin 9, causing it to attract the locking pin 9 (against the force of a locking spring). This triggering movement of the locking pin 9 via the magnet 10 is enabled by the previously described lifting of the lock chain 4, as the engagement between the pin 9 and the lock chain 4 is released. Once the door leaf is fully closed, the latch bolt 3 moves into the area of ​​a corresponding bolt receptacle, e.g., an opening in the strike plate 7, and the spring force allows the latch bolt 3 to retract into the recess in the strike plate. Since the lock chain 4 is no longer held by the locking pin and consequently descends, the latch bolt 3 is no longer held in the partially extended position but can extend fully.

[0033] The lock chain 4 lowers into the lowered locking position, and during this lowering, the pivoting hook bolt 25 is pivoted out. For this purpose, the lock chain 4 is coupled to the pivoting hook bolt 25. The lock chain 4 has a (hook-like) actuating arm 35, which interacts with the pivoting hook bolt 25 via an actuating lever 36, forming a reduction gear. The actuating lever 36, with its toothing 36', forms the first gear element, and the pivoting hook bolt is rotationally fixed (or possibly integrally) connected / formed with a second gear element 37, which has toothing 37'. This functional position is then in the Fig. 5a , 5b shown. The latch bolt 3 is also fully extended in this locked operating position. In addition, the swing hook bolt 25 is secured against retraction by a locking lever 33. The latch bolt 3 is in the Fig. 5a , 5bThe fully extended locking position shown is also secured against retraction by means of the locking element 34. A comparative analysis of the Fig. 4 and 5a shows that this safety element 34 according to Fig. 5a has reached the backstop-protected locking position. However, in the illustrated embodiment, the latch bolt 3 is not only backstop-protected in this fully extended locking position, but already in the Fig. 4 depicted boundary position or from the point in Fig. 4 The depicted limit position. Consequently, a two-stage or double backstop is implemented. In the Fig. 4 In the depicted limit position, the retraction protection of the latch bolt 3 is not achieved via the locking element 34, but via the control lever 27, which interacts with the lock chain 4. Comparing the functional position in Fig. 4 (Border position) with the functional position in Fig. 2a , thus one can see that the latch bolt 3 is in the unlocked position after Fig. 2a It is not secured against back-locking, as the latch bolt 3 can lift the lock chain due to its contour via the edge 30 and the control lever 27. In contrast, the control lever 27 is in the functional position according to Fig. 4 in an attempt to push back the latch bolt 3 via the lock chain, so that a reliable backstop of the latch bolt 3 is already in or from this limit position after Fig. 4 has been realized.

[0034] Of particular importance now is the transition from the to Fig. 2a , 2b on the one hand into the in Fig. 5a , 5b On the other hand, the functional positions shown indicate that the swing bolt is only moved into the swung-out locking position when the latch bolt is in the Fig. 4 The partially extended (anti-return) limit position shown in the illustration has been reached. In this limit position, the latch bolt 3 projects beyond the lock housing or the lock faceplate by a limit dimension M2, which is larger than the unlocking dimension M1 and smaller than the locking dimension M3. In the illustrated embodiment, the limit dimension M2 is approximately 13 mm, while the unlocking dimension M1 is approximately 10 mm and the locking dimension M3 is approximately 20 mm. Consequently, when the door is closed and the release magnet retracts the locking lever, thus releasing the lock chain 4, the lock chain 4 descends and simultaneously the latch bolt 3 extends gradually. This pivots the control lever 27, which, via the control cam 29, initially prevents the lock chain 4 from descending further. Only when the control lever pivots further can the lock chain 4 descend further due to the control contour 32 provided on the lock chain 4, thus extending the pivot bolt.This results from a comparative analysis of the . Fig. 2a , 2b (partially extended unlocking position) on the one hand and the Fig. 4 (Limit position during self-locking) and finally the Fig. 5a and 5b (Locking position).

[0035] The lock is unlocked starting from Fig. 5a , 5b e.g. by actuating a handle or lock cylinder, or by a motor drive in which the drive rod and thus also the connected lock chain 4 are raised. This initially causes the lock chain 4 to pivot the anti-return device or the locking lever 33 slightly upwards, so that the anti-return device for the swing hook bolt 25 and the latch bolt 3 is released. This unlocked position is not shown separately in the figures, but it is in Fig. 5b It is evident that the lock chain 4 has a projection in the area of ​​the actuating arm 35, which, in the course of lifting the lock chain 4, pivots the lever 33 clockwise and thus raises it. As the lock chain 4 continues to be lifted, the pivot bolt 25 is retracted via the reduction gear 36', 37'. In addition, the latch lever 12 is pivoted by the actuation of the pin 17, thus retracting the latch bolt 3, so that finally the functional position is reached. Fig. 3 is reached. If the door remains in the open position, the latch engages when the handle is released. Fig. 2a , 2b The partially extended unlocked position is shown, in which the lock chain is blocked by the locking element. If the door then falls into the frame, the self-locking mechanism engages as described, returning it to its functional position. Fig. 5a , 5b ends.

Claims

1. A locking unit (1, 2) for a closing system of a door, in particular for an espagnolette lock with multipoint locking, said locking unit having at least - a lock housing (22), which can be mounted on a door leaf, e.g. on a lock faceplate (5), - a lock chain (4), which is displaceable within the lock housing (22), - and at least one latch bolt (3), which is displaceable within the lock housing (22), has a bevelled actuation edge (14) associated with the strike plate (7), and is loaded towards an extended locking position with a latch spring (13), wherein the latch bolt (3) can be pulled back out of an extended locking position or a partially extended unlocking position into a retracted opening position by means of the lock chain (4), wherein the latch bolt projects out of the lock housing (22) or beyond the faceplate (5) by an unlocking distance (M1) when in the partially extended unlocking position, wherein the lock chain (4) is held in the unlocking position by a blocking element (9), and wherein the latch bolt (3) is held in the partially extended unlocking position by the lock chain (4) in the unlocking position thereof, wherein a blocking element (9) is actuatable for automatic locking of the locking unit such that the blocking element (9) releases the lock chain (4) so that the latch bolt (3) is automatically moved into the extended locking position, wherein a bolt (25) is mounted in the lock housing (22) in addition to the displaceable latch bolt (3), said bolt being coupled to the lock chain (4) such that it can be moved with the lock chain (4) out of a pivoted-in unlocking position into a pivoted-out locking position and vice versa, wherein, when the door leaf passes into the closing position, the bolt (25) is moved into the pivoted-out locking position only when the latch bolt (3) reaches or exceeds a partially extended threshold position in which the latch bolt (3) projects out of the lock housing (22) or beyond the faceplate (5) by a threshold distance (M2) that is greater than the unlocking distance (M1) in the unlocking position, characterised in that - the blocking element (9) is actuatable by a trigger magnet such that the blocking element (9) releases the lock chain (4) so that the latch bolt (3) is automatically moved into the extended locking position, - the additional bolt (25) is a hooked pivot bolt, and - the latch bolt (3) is secured in two stages against being pushed back, in that it is secured against being pushed back both in the partially extended threshold position and in the fully extended locking position.

2. The locking unit according to Claim 1, characterised in that the lock chain (4) is operatively connected to the latch bolt (3) via at least one pivotable latch lever (12) only such that the latch bolt (3) can be pulled back via the latch lever (12) only out of the locking position or the partially extended unlocking position into the fully retracted opening position and is held in the partially extended unlocking position when the door is open.

3. The locking unit according to one of Claims 1 or 2, characterised in that, after release by the blocking element (9), the lock chain (4) is held by the latch bolt (3) until the spring-loaded latch bolt (3) reaches the partially extended threshold position.

4. The locking unit according to one of Claims 1 to 3, characterised in that the lock chain (4) is operatively connected to the latch bolt (3) via a control lever (27) such that, after release by the blocking element (9), the lock chain (4) is held by the control lever (27) until the spring-loaded latch bolt (3) reaches the partially extended threshold position.

5. The locking unit according to Claim 4, characterised in that the control lever (27) is designed as a pivotable lever and is preferably mounted in the lock housing (22) pivotably about an axis (28).

6. The locking unit according to Claim 4 or 5, characterised in that the control lever (27) has a control cam (29), which is actuated by an actuation face (30) of the latch bolt (3) and acts on the lock chain (4).

7. The locking unit according to one of Claims 4 to 6, characterised in that the control lever (27), e.g. the control cam (29) thereof, acts on or loads a control contour (32) of the lock chain (4).

8. The locking unit according to one of Claims 1 to 7, characterised in that the hooked pivot bolt (25) is secured against being pushed back with a first securing element (33), e.g. a securing lever.

9. The locking unit according to one of Claims 1 to 8, characterised in that the lock chain (4) has an actuation portion, e.g. an actuation arm or actuation projection (35), which is coupled to the hooked pivot bolt (25) or to an actuation lever (36) for the hooked pivot bolt (25).

10. The locking unit according to one of Claims 1 to 9, characterised in that the lock chain (4) is coupled to the hooked pivot bolt (25) via a gearing mechanism, preferably a reduction gearing mechanism, wherein e.g. the actuation lever (36) is coupled as the first gearing element to a second gearing element (37) fastened to or formed by the hooked pivot bolt (25).

11. The locking unit according to one of Claims 1 to 10, characterised in that the locking unit is designed as an additional locking system (2) of an espagnolette lock, wherein the lock chain (4) of the additional locking system (2) is connected to a drive rod (6) that couples the central lock (1) and the additional locking system (2) to one another.

12. An espagnolette lock having at least one central lock (1) and at least one additional locking system (2), wherein at least the additional locking system (2) is designed as a locking unit according to one of Claims 1 to 11.

13. A locking assembly consisting of at least one locking unit according to one of Claims 1 to 12 and having at least one strike plate (7) associated with the locking unit, wherein a trigger magnet (10) is arranged in or on the strike plate (7) to actuate the blocking element (9) of the locking unit (1, 2).