Abstract:
In a locking device for a door, window or the like, having a main lock box, at least one supplementary lock box, and at least one drive rod connecting the supplementary lock boxes to the main lock box, better resistance to break-ins is attained in that the supplementary lock box has a latch bolt that can be retracted freely into the latching position, wherein the latch bolt is displaceable by a spring and/or by a gear past the normal latching position into its locking position.

Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates to a locking device for a door, window or the like, having a main lock box, at least one supplementary lock box, and at least one drive rod connecting the supplementary lock boxes to the main lock box.  
         BACKGROUND OF THE INVENTION  
         [0002]    From German Patent DE 35 05 379 C1, a drive rod lock has been disclosed that is connected via a drive rod to a middle lock. In other words, this drive rod connects the two latches of the two locks. In this way, a door can be connected to the edge plate in the door frame not only in the middle but also in the region of its corners. When the door is closed, the latches are pushed inward along the edge plate, so that the door can assume its closing position. For opening the door, the latch of the middle lock is actuated and retracted via a door handle or a lock cylinder; this motion is transmitted via the drive rod via the latch of the drive rod lock, thus retracting this latch as well. A disadvantage here is that when the latch is pushed inward, the drive rod is also always moved. This makes the latch sluggish and causes functional problems.  
           [0003]    European Patent Disclosure EP 431 369 A2 discloses a mortise lock with a latch bolt. This latch bolt has the task, besides that of a conventional bolt, of additionally locking the door, which is accomplished in that the latch bolt after the door is closed changes over automatically from a latching position to a locking position, in which it is pushed farther out of the mortise lock than in the latching position and thus engages far inside the edge plate in the door frame. As a rule, such a latch bolt can no longer be retracted by inserting some tool into the slit between the door and the door frame. A door with this kind of latch bolt is automatically locked after being closed.  
         OBJECT AND SUMMARY OF THE INVENTION  
         [0004]    An object of the present invention is to furnish a locking device with supplementary lock boxes with which the door offers better resistance to break-ins and moreover to improve the latch function.  
           [0005]    According to the present invention, this object is attained in that in the locking device of the type referred to at the outset, the supplementary lock box has a latch bolt that can be retracted freely; the latch bolt is displaceable by a spring and/or by a gear past the normal latching position into its locking position.  
           [0006]    With the locking device according to the present invention, the advantage is attained that the door can be held outside the middle, or in other words at least in the region of one corner, via the latch bolt and can also be locked thereby. If a door equipped with the locking device according to the present invention is swung shut, then first the latch bolt is retracted via the edge plate in the door frame, thus making it possible for the door to be closed. If the door is in the closed position, the latch bolt is pushed out of the supplementary lock box and moves past its latching position into a locking position. In that position, the latch bolt cannot be pushed back into the gap between the door and the door frame, for instance, by inserting some flat tool. A door locked in this way offers high resistance to break-ins.  
           [0007]    It is especially worth noting that the latch bolt, when the door is open, is held in the latching position by a blocking element, so that the door can easily be closed. Not until the door assumes its closed position does the blocking element release the latch bolt, so that the latch bolt can move past the latching position further by approximately 10 mm to 15 mm out of the supplementary lock box and can engage the edge plate in the door frame. The release of the latch bolt by the blocking element takes place automatically whenever the door assumes its closing position, since then the blocking element is forced by the edge plate in the door frame into the release position. In other words, the automatic movement outward of the latch bolt is tripped by the edge plate.  
           [0008]    In a further feature it is provided that the blocking element is supported pivotably in the latch bolt in a normal plane to the pivot axis of the door. In other words, the blocking element has a pivot axis parallel to the pivot axis of the door, so that when it meets the edge plate it can deflect. In the position of repose, the blocking element protrudes part way past the contour of the latch bolt.  
           [0009]    Preferably, the blocking element is forced in the projection direction via a spring-loaded lever. From this projection direction, in which the blocking element protrudes beyond the contour of the latch bolt, the blocking element can be pushed counter to the force of the spring-loaded lever into a position inside the contour of the latch bolt and is thereby rendered inoperative.  
           [0010]    In one exemplary embodiment it is accordingly provided that via the blocking element, the latch bolt is forced into the latching and locking position. The spring-loaded lever that forces the blocking element in the projection direction also brings about the projection of the latch bolt into its latching position when the door is open and into its locking position when the door is closed.  
           [0011]    The latch bolt, on its side opposite the contact incline and in the region of the latch tail, preferably has a protrusion which is engaged by a latch restoring lever. Via this latch restoring lever, the latch bolt is retracted either out of its locking position or out of its latching position, to allow the door to be opened. The latch restoring lever is connected to the drive rod in such a way that on actuation of the drive rod it is carried along by the drive rod into the reverse closing position. On being shifted into this reverse closing position, the latch restoring lever pulls the latch bolt all the way into the supplementary lock box. Via the drive rod, a plurality of supplementary lock boxes can be connected to the main lock box, so that the individual latch bolts of the supplementary lock boxes are thrust synchronously into the respective lock boxes via the drive rod. The use of a plurality of lock boxes over the height of the door also prevents warping of the door and further reduces the danger of break-ins.  
           [0012]    Preferably, on closure of the door and pushing in of the latch bolt, the latch restoring lever is pivoted by the latch bolt and decoupled from the drive rod. Accordingly, on closing of the door only the latch bolt is thrust inward but the drive rod is not actuated.  
           [0013]    Preferably, the latch restoring lever is pivotable about an axis at right angles to the door leaf. In this way, the latch restoring lever converts the shear force, which on displacement of the drive rod extends in a direction parallel to the pivot axis of the door, into a shear force that is orthogonal to it and is located at the plane of the door leaf, and with this latter shear force the latch bolt can be retracted into the supplementary lock box.  
           [0014]    In accordance with a preferred exemplary embodiment, the latch bolt is engaged by a latch blocking lever, which when the latch bolt has been pushed all the way out locks the latch bolt in the locking position. This latch blocking lever prevents the latch bolt, located in the locking position, from being retractable into the supplementary lock box, for instance via a tool inserted between the door and the door frame, even if the door frame is damaged, exposing the latch bolt.  
           [0015]    A further feature provides that the latch blocking lever in the locking position engages the latch bolt, or a protrusion of the latch bolt from behind with a latch blocking edge. As soon as the latch bolt assumes its locking position, the latch blocking lever is shifted in such a way that its latch blocking edge secures the latch bolt in the locking position. Displacement of the latch bolt can occur only whenever the engagement from behind of the latch blocking edge of the latch blocking lever is undone.  
           [0016]    An especially preferred exemplary embodiment contemplates that the latch restoring lever has a pawl, which upon actuation of the latch restoring lever by means of the drive rod lifts the latch blocking lever out of its position that locks the latch bolt and releases the latch bolt for retraction.  
           [0017]    Accordingly, if the latch bolt is in its locking position and is secured in that position via the latch blocking lever, then by actuation of the drive rod the latch restoring lever, with which the latch bolt is retracted into the supplementary lock box, and the latch blocking lever can be lifted out of the blocking position of the latch blocking lever before the latch bolt is retracted.  
           [0018]    The latch blocking lever may be supported pivotably about an axis perpendicular to the door leaf. Moreover, the latch blocking lever is connected to a spring, in particular a torsion spring, that forces it into the locking position. As a consequence, when the latch bolt is projected all the way, the latch blocking lever automatically assumes the locking position and locks the latch bolt against being retracted.  
           [0019]    The noted object is also attained with the variant of the present invention, which may also be a further feature of the aforementioned present invention, in which the locking device is further developed such that the supplementary lock box has a latch bolt, and the latch bolt can be moved from a latching position into a locking position via the first drive rod and back, and via a second drive rod from the latching position into a retracted position.  
           [0020]    In this locking device according to the present invention, the latch bolt after the door is closed is shifted via the first drive rod into the locking position, thereby securing the door against a break-in. From this position, the latch bolt can again be brought back into the latching position by actuation of the first drive rod. Moreover, the latch bolt can be retracted all the way into the supplementary lock box via the second drive rod, so that the door can be opened. It is considered advantageous that upon actuation of the first drive rod, the latch bolt will certainly engage the associated edge plate and lock the door. The latch bolt is reinforced in this task by a spring that acts in the projection direction.  
           [0021]    Moreover, via the drive rod, the stroke of the latch bolt on moving outward to the locking position can be lengthened, which achieves even greater protection against break-ins.  
           [0022]    A preferred exemplary embodiment of the present invention contemplates that via the first drive rod, the latch bolt is not only lockable but also retractable all the way into the supplementary lock box. This has the advantage that the latch bolt can be displaced via a single drive rod over the entire working range.  
           [0023]    Advantageously, the latch bolt is retractable via the second drive rod only whenever the latch bolt is in the latching position. If the latch bolt is pushed all the way out, or in other words is in the locking position, then the latch bolt is uncoupled from the second drive rod; in other words, the second drive rod cannot transmit the adjusting forces to the latch bolt.  
           [0024]    Advantageously, the first drive rod is operatively connected to a lock cylinder of the main lock box. Via this lock cylinder, the latch bolt can accordingly be moved both into the open position and into the locking position. If the latch bolt is in the locking position, then in this exemplary embodiment the door can be unlocked and opened solely via the lock cylinder. If the latch bolt is in the latching position, then it can be drawn inward into the lock box either via a handle or via the lock cylinder. It is understood that instead of the door handle and lock cylinder type of lock, a doorknob lock, of the kind encountered as a rule in the United States, may be provided. One exemplary embodiment contemplates that the latch bolt is connected via toothing, in particular a rack that meshes with a split toothed ring of a drive wheel. This drive wheel has the function of moving the latch bolt between its locking position and its fully retracted position. The latch bolt and the drive wheel may form a step-up or step-down gear.  
           [0025]    Preferably, the end of the first drive rod toward the supplementary lock box is connected to the drive wheel via two tabs. Via the first tab, the drive wheel is driven. Both tabs are pivotably fixed both to the end of the drive rod and to the drive wheel. The first tab drives the drive wheel in different directions and with a journal engages an oblong slot in the drive wheel, and the second tab engages a slide that is connected to the drive wheel. A journal is provided on the slide, which engages an oblong slot provided on the end of the second tab remote from the drive rod. In this way, a decoupling—that is, idle travel of the drive wheel—from the first drive rod is made possible, so that when the latch bolt is retracted—that is, the door has been shut—into the supplementary lock box the drive wheel is indeed moved along but the first drive rod remains in repose, since because of the oblong slots some idle travel has been created for the first drive rod on the drive wheel.  
           [0026]    Preferably, the end of the second drive rod toward the supplementary lock box engages the drive wheel via a slide pivotably secured to the drive wheel. Via this slide, the drive wheel can accordingly be moved in the opening direction, thus retracting the latch bolt.  
           [0027]    A preferred embodiment contemplates that the slide can be swiveled out of operative range of the second drive rod for the second tab. This is the case whenever the latch bolt has been displaced into its locking position via the first drive rod, and via the two tabs the drive wheel has been rotated in the closing direction and in the process the slide has been swiveled out of operative range of the second drive rod. In that case, the drive wheel can no longer be addressed via the second drive rod, since the operative connection has been interrupted by the outward swiveling of the slide out of operative range. Only via the first drive rod can the drive wheel be displaced back into the latching position, in which the operative connection between the second drive rod, the slide and the drive wheel is then re- established.  
           [0028]    A decoupling of a plurality of latch bolts is attained in that the latch bolt is retracted upon closure of the door and is out of operative communication with the two drive rods. This embodiment has the advantage that by pushing a tool into the gap between the door and the door frame, for instance, the latch bolt in the latching position can still be retracted, but the other latch bolts are not automatically retracted with it. In other words, the decoupling further increases the protection against break-ins.  
           [0029]    In an exemplary embodiment of the present invention it is contemplated that the latch bolt is embodied as a swivel latch bolt. In this embodiment, the latch bolt is not pushed linearly out of the lock box but instead is rotated about a pivot axis and emerges from the lock box in the course of the rotary motion. This swivel latch bolt is swivelable in a manner corresponding to a swivel bolt.  
           [0030]    The latch bolt is preferably retractable electromagnetically. In this way, the door can be opened with an electric door opener, for instance, in that all the latch bolts are retracted simultaneously in a known manner via a magnet.  
           [0031]    Preferably, the main lock box has a latch bolt, a bolt and/or a latch. In a further feature of the present invention, the main lock box may be embodied as a panic lock.  
           [0032]    Further advantages, characteristics and details will become apparent from the claims and the ensuing specification, in which especially preferred embodiments are described in detail in conjunction with the drawing. The characteristics shown in the drawing and those recited in the specification and claims may be essential to the present invention either individually or in any arbitrary combination with one another. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWING  
       [0033]    [0033]FIG. 1 is a front view of a first embodiment of the locking device according to the present invention, including a main lock box and two supplementary lock boxes disposed on either side, the latches of the lock boxes being in the latching position;  
         [0034]    [0034]FIG. 2, a front view of the main lock box with the box lid removed, the bolt retracted, and the latch in the latching position;  
         [0035]    [0035]FIG. 3 is a front view of the supplementary lock box with the box lid removed and the latch in the latching position;  
         [0036]    [0036]FIG. 4 is a section through the latch taken along the line IV-IV of FIG. 3;  
         [0037]    [0037]FIG. 5 is a view corresponding to FIG. 3, but with the latch in the locking position;  
         [0038]    [0038]FIG. 6 is a section through the latch taken along the line VI-VI of FIG. 5;  
         [0039]    [0039]FIG. 7 is a view corresponding to FIG. 6, with the latch retracted into the supplementary lock box;  
         [0040]    [0040]FIG. 8 is a front view of a first embodiment of the locking device of the present invention with a main lock box and a supplementary lock box and with the latches in the latching position;  
         [0041]    [0041]FIG. 9 is a view corresponding to FIG. 8, but in which the handle follower of the main lock box assumes a working position as a result of which the latches have been retracted into the two lock boxes;  
         [0042]    [0042]FIG. 10 is a view corresponding to FIG. 8, in which the bolt of the main lock box and the latch bolt of the supplementary lock box are in the locking position;  
         [0043]    [0043]FIG. 11 is a front view of the main lock box with the box lid removed, the bolt retracted and the latch in the latching position;  
         [0044]    [0044]FIG. 12 is a view of the main lock box corresponding to FIG. 11, in which the handle follower assumes a position like that shown in FIG. 9;  
         [0045]    [0045]FIG. 13 is a view of the main lock box in accordance with FIG. 11, in which the lock cylinder assumes a working position, the bolt is retracted, and the latch is retracted into the lock box;  
         [0046]    [0046]FIG. 14 is a front view of the supplementary lock box with the latch bolt in the latching position;  
         [0047]    [0047]FIG. 15 is a front view of the supplementary lock box of FIG. 14 with the latch bolt in the latching position;  
         [0048]    [0048]FIG. 16 is a view of the supplementary lock box of FIG. 14 in which the latch bolt has been retracted into the lock box;  
         [0049]    [0049]FIG. 17 shows a further exemplary embodiment of a main lock box of the locking device of the present invention with an extended bolt and a latch in the latching position, this main lock box being embodied as a panic lock;  
         [0050]    [0050]FIG. 18 shows the main lock box of FIG. 17 with a latch retracted into the box and a retracted bolt; and  
         [0051]    [0051]FIG. 19 shows the main lock box of FIG. 17 in a position of repose with the latch in the latching position. 
     
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0052]    The locking device shown in FIG. 1 and identified overall by reference numeral  1  comprises one main lock box  2  and two supplementary lock boxes  3 . The lock boxes  2  and  3  are secured to a lock faceplate  4 . The main lock box  2  is closed with a box lid  5 , a handle follower  6 , a lock cylinder  7 , a latch  8 , and a bolt  9 . The latch  8  is in the latching position, so that it can be pressed into the main lock box  2  from an edge plate  33 , shown in FIG. 6, that is located on the door frame. The bolt  9  is in the retracted position. The supplementary lock boxes  3  are likewise provided with a latch, these latches being embodied as latch bolts  10 . The latch bolts  10  are also located in their latching position and can thus be pressed inward into the respective supplementary lock box  3  from an edge plate  33 . Finally, a drive rod  11  can also be seen, which connects the main lock box  2  to the supplementary lock boxes  3 .  
         [0053]    In the front view shown in FIG. 2 of the main lock box  2 , the box lid  5  has been removed, so that the interior components of the lock can be seen. For instance, the change lever  12  actuatable by the lock cylinder  7 ; via pin  13 , engages a slide  14  of an arm  15  of a control follower disk  16 . The slide  14  acts on a displacement stop  17 , which is secured to a control plate  18 . In this control plate  18 , the drive rod  11  is suspended at  19 . The control follower disk  16  has a further arm  20 , which rests on a tail  21  of the latch  8 .  
         [0054]    If the change lever  12  and the control follower disk  16  are actuated clockwise via the lock cylinder  7  and via itself, respectively, then the latch  8  is retracted into the main lock box  2  via the arm  20  and the latch tail  21 . However, this can also be done via a handle, not shown. The handle follower  6  is actuated clockwise, with the handle follower  6  carrying the control follower disk  16  along in its rotary motion. Moreover, upon actuation of the lock cylinder  7  or handle follower  6 , the slide  14 , and via it, the control plate  18  are shifted, thereby actuating the drive rod  11 .  
         [0055]    The supplementary lock box  3  is connected to this drive rod  11  as shown in FIG. 3. In the supplementary lock box  3 , shown without the box lid, the latch bolt  10  is supported so as to be displaceable in the direction of the section line. The latch bolt  10  is in the latching position in FIGS. 3 and 4; in this position the latch bolt  10  with its contact incline  22  (FIG. 4) protrudes past the faceplate  4 .  
         [0056]    It can also be seen in FIG. 4 that the latch bolt  10  is provided with a groove  23  open on one side and extending in the longitudinal direction of the latch bolt. Located in this groove  23  is a blocking element  24 , which is pivotable in the groove  23  around a tension sleeve  25  and is thus supported in the latch bolt  10 . This blocking element is provided with a blocking pawl  26  and a tripping pawl  27 .  
         [0057]    In the latching position, which is shown in FIG. 4, the blocking pawl  26  engages the faceplate  4  from behind and prevents further projection of the spring-loaded latch bolt  10 . This spring force is brought to bear by a latch projection spring  28  (FIG. 3), which is thrust onto a spring guide pin  29  and is braced on one side against the inner wall of the housing of the supplementary lock box  3  and on the other on a latch projection lever  30 . This latch projection lever  30  is pivotably supported in a bearing  31 . The end of the latch projection lever  30  opposite the bearing  31  engages the end of the blocking element  24  opposite the tripping pawl  27  and forces it in the projection direction under the force of the latch projection spring  28 . Since the blocking element  24  is connected to the latch bolt  10  via the tension sleeve  25 , the latch bolt is likewise forced in the projection direction.  
         [0058]    It can be seen in FIG. 4 that the latch projection lever  30  does engage the blocking element  24 , but the direction of force of the latch projection lever  30  does not pass through the pivot bearing of the blocking element  24 , which bearing is embodied by the tension sleeve  25 , so that the latch projection lever  30  exerts a counterclockwise pivoting moment on the blocking element  24 . Because of this pivoting moment, the blocking pawl  26  and the tripping pawl  27  are lifted out of the groove  23 .  
         [0059]    When the door is open (not shown), the latch bolt  10  is accordingly in the latching position shown in FIGS. 3 and 4, in which a further projection is prevented by engagement of the faceplate  4  from behind by the blocking pawl  26 .  
         [0060]    As the door is being closed or shut, the latch bolt  10  is retracted into the supplementary lock box  3  via the edge plate  33  (FIG. 6).  
         [0061]    If the door is in its locking position and the latch bolt  10  is aligned with the latch opening  32  in the edge plate  33  of the door frame (FIG. 6), then the fully retracted latch bolt  10  is pushed out of the supplementary lock box  3  via the latch projection lever  30 . During this projection motion, the blocking element  24  is simultaneously pivoted counterclockwise about the tension sleeve  25 . In this process, the tripping pawl  27  comes into contact with the edge facing it of the latch opening  32  of the edge plate  33 , and as a result the blocking element  24  is retracted counter to the swiveling moment into the groove  23  so far that the blocking pawl  26  can slide past the faceplate  4 . In this way, locking of the latch bolt  10  in the latching position of FIG. 4 is prevented, and so the latch bolt  10  is capable of moving outward into the locking position. In this locking position, the latch bolt  10  has moved approximately 10 mm to 15 mm farther out of the supplementary lock box  3  than in the latching position shown in FIGS. 3 and 4.  
         [0062]    In a further embodiment, the latch projection lever  30 , after pivoting of the blocking element  24 , can rest directly on the latch bolt and move it outward into the locking position.  
         [0063]    As FIG. 5 shows, the latch tail  34  has a protrusion  35 . FIG. 5 also shows that a latch blocking lever  37  is pivotably supported in a bearing pin  36  and is spring-loaded counterclockwise via a blocking lever spring  38 , which is embodied as a torsion spring. If the latch bolt  10  is in the fully projected position shown in FIGS. 5 and 6, that is, in the locking position, then a latch blocking edge  39  engages the protrusion  35  from behind. Although a slight spacing may exist between the protrusion  35  and the latch blocking edge  39 , as shown in FIG. 5, nevertheless the latch blocking edge  39  intersects the displacement path of the protrusion  35 .  
         [0064]    If the latch bolt  10  is now thrust into the supplementary lock box  3 , for instance by means of a tool or the like, then the protrusion  35  comes to rest on the latch blocking edge  39 , and further retraction is prevented. Accordingly, in its locking position the latch bolt  10  is secured against retraction.  
         [0065]    If a latch restoring lever  40 , which with one arm  41  engages the free end of the drive rod  11  and with its other arm  42  engages a further protrusion  43  of the latch tail  34 , is pivoted via the drive rod  11 , then a pawl  44  of the free end of the arm  42  engages a slot  45  of the latch blocking lever  37  (FIG. 5) and lifts it far enough out of its locking position, in which the latch blocking edge  39  engages the protrusion  35  from behind, that the latch blocking edge  39  moves out of the displacement path of the protrusion  35 . The arm  42  also rests on the protrusion  43  and upon swiveling of the latch restoring lever  40  pulls the latch bolt  10  into the supplementary lock box  3  (FIG. 7). Once the latch bolt  10  has been retracted all the way into the box  3 , the door can be opened.  
         [0066]    When the door is open and the drive rod  11  is in the position of repose, the latch bolt  10  is pushed out via the latch projection lever  30  far enough that the blocking pawl  23  engages the faceplate  4  from behind, as shown in FIG. 5, and prevents its further projection.  
         [0067]    On retraction of the latch bolt  10  by shutting the door, the latch restoring lever  40  is indeed pivoted out of this latching position into the supplementary lock box  3 , but the arm  41  is lifted away from the drive rod  11 , so that this arm is not moved along as well.  
         [0068]    A further drive rod  11 ′ can be coupled via suitable drivers  46 ,  46 ′.  
         [0069]    If the bolt is omitted from the main lock box  2 , then a lock with a simple panic function is obtained, since the locked state can be undone at any time by actuating the handle, not shown.  
         [0070]    The second embodiment, shown in FIG. 8 and identified overall by reference numeral  101 , of the locking device of the present invention, which may also be a further feature of the locking device described above, comprises one main lock box  102  and one supplementary lock box  103 . The lock boxes  102  and  103  are secured to a lock faceplate  104 . The main lock box  102  is closed with a box lid  105 , and a tripping follower  106 , a lock cylinder  107 , a latch  108 , and a bolt  109  can be seen. The latch  108  is in the latching position, so that it can be pressed into the main lock box  102  by an edge plate, not shown, that is located in the door frame. The bolt  109  is in the retracted position. The supplementary lock box  103  is likewise provided with a latch, which is embodied as a latch bolt  110 . This latch bolt  110  is likewise in its latching position and can likewise be pressed into the supplementary lock box  103  from an associated edge plate. Finally, a first drive rod  111  and a second drive rod  112  can also be seen, which connects the main lock box  102  to the supplementary lock box  103 .  
         [0071]    [0071]FIG. 9 shows the locking device  101  of FIG. 8; here, the handle follower  106  has been actuated by means of a handle, not shown, in the direction of the arrow  113 , and as a result both the latch  108  and the latch bolt  110  have been retracted into the corresponding lock boxes  102  and  103 , respectively.  
         [0072]    [0072]FIG. 10 again shows the locking device  101  according to the present invention shown in FIG. 8; by actuation of the lock cylinder  107 , both the bolt  109  and the latch bolt  110  have been extended. In FIG. 10, the latch bolt  110  assumes its locking position and protrudes past the latch  108  by approximately 10 mm to 15 mm.  
         [0073]    In the main lock box  102  view shown in FIG. 11, the box lid  105  has been removed, making the lock fittings visible. The change lever  114  actuatable by the lock cylinder  107  can be seen; via a connecting rod  115 , it is connected to a second control plate  116  and to a control follower disk  117 . The second drive rod  112  is coupled to the second control plate  116  via suitable drivers  118 . Located parallel to the second control plate  116  is a first control plate  119 , to which the first drive rod  111  is coupled via suitable drivers  120 . The drive of the first control plate  119  is effected via the lock cylinder  107 , which is coupled to a gear, for instance a planetary gear  121 , which is shown merely in suggested fashion. With this first control plate  119 , the bolt  109  can be pushed out of the main lock box  102  via a slot  122 . On actuation of the planetary gear  121  to the reverse closing direction (FIG. 13), the change lever  114  is actuated; besides the second control plate  116 , it drives the control follower disk  117  as well. An arm  123  engages a latch tail  124  from behind and, as shown in FIG. 13, pulls the latch  108  into the main lock box  102 . The lock cylinder  107  is actuated in the direction of the arrow  125 . The second control plate  116  and with it the second drive rod  112  is also displaced.  
         [0074]    If as shown in FIG. 12 the handle follower  106  is rotated in the direction of the arrow  126  by means of a handle, not shown, then the control follower disk  117  is likewise displaced clockwise and the latch  108  is retracted. Since the change lever  114  is pivotably connected to the control follower disk  117 , the second control plate  116  and with it the second drive rod  112  is displaced as well, as described above.  
         [0075]    The supplementary lock box  103  is connected to this drive rod  112 , as shown in FIG. 14. In this supplementary lock box  103 , the latch bolt  110  is supported displaceably in the longitudinal direction of the slit via a slit guide  127 . In FIG. 14, the latch bolt  110  assumes its latching position, in which with its contact incline it protrudes beyond the faceplate  104  (as in FIG. 4). Via the force of a projection spring  128  (compression spring), which is supported against the inner wall of the housing of the supplementary lock box  103  and is received in a bore  129  that is provided on the back side of the latch bolt  110 , the latch bolt  110  is forced out of the supplementary lock box  103 .  
         [0076]    One longitudinal side of the latch bolt  110  is embodied over a portion of its length as a rack  130  and meshes with a split toothed ring  131  of a drive wheel  132  that is rotatably supported on a journal  133 . The free end of the first drive rod  111  has a driver  134 , which is provided with a journal  135 . A first tab  136  and a second tab  137  are pivotably secured to this journal  135 . The free end of the first tab  136  is provided with a pin  138 , which engages an oblong slot  139  of the drive wheel  132 , this slot being curved in the circumferential direction. The free end of the second tab  137  is provided with an oblong slot  140  which is engaged by a journal  141 . This journal  141  is secured to a slide  142 , which in turn is pivotably connected to the drive wheel  132  by a journal  143 . A driver  144  of the second drive rod  112  engages the free end of this slide  142 .  
         [0077]    In FIG. 14, the latch bolt  110  is in the latching position and protrudes beyond the faceplate  104  essentially with its contact incline, not shown (as in FIG. 4). In this position, the rod  138  rests on one end of the oblong slot  139 , and the slide  142  is supported by its free end on the driver  144 .  
         [0078]    If as shown in FIG. 10 the bolt  109  is extended via the lock cylinder  107 , then the first control plate  119  and with it the first drive rod  111  (see FIG. 15) are moved downward in the direction of the arrow  145 . As a result of this shift, the slide  142  is moved via the second tab  137  out of operative range of the driver  144 , in that the slide  142  is pivoted counterclockwise about the journal  143 . The first tab  136  after traversing the oblong slot  139 , also drives the drive wheel  132 , so that this wheel is likewise rotated counterclockwise about the journal  133 . This rotary motion, via the engagement of the split toothed ring  131  with the rack  130 , effects a projection motion of the latch bolt  110 . The latch bolt now assumes its locking position. In this position of the drive components, a displacement of the second drive rod  112  causes no change of position of the drive wheel  132 , since the driver  144  and the drive wheel  132  are not operatively connected.  
         [0079]    If beginning at the position of FIG. 14 either the handle follower  106  as in FIG. 12 or the lock cylinder  107  as in FIG. 13 is actuated, then the drive rod  112  is shifted in the direction of the arrow  146  (FIG. 16). The driver  144 , which is connected to the drive wheel  132  via the slide  142 , upon its shift causes the drive wheel  132  to be rotated clockwise about the journal  133 . The split toothed ring  131  drives the rack  130  of the latch bolt  110  and pulls the latch bolt back into the supplementary lock box  103 . This compresses the projection spring  128 . The rotation of the drive wheel  132  is hindered neither by the first tab  136  nor the second tab  137 , since the pin  138  of the free end of the first tab  136  can deflect within the oblong slot  139 , and the journal  141  of the slide  142  can deflect in the oblong slot  140  of the free end of the second tab  137 .  
         [0080]    As can be seen in FIG. 14, when the latch bolt  110  is retracted, for instance by means of a tool inserted into the gap between the door and the door frame, the drive wheel is indeed rotated clockwise about the journal  133 , but the first drive rod  111  remains in repose, since neither the pin  138  of the first tab  136  nor the second tab  137  is entrained via the journal  141 , as can be seen from FIG. 16. Thus if the latch bolt  110  is retracted without authorization, then neither the first drive rod  111  nor the second drive rod  112  is actuated via this latch bolt  110 . Hence the other bolt  109  or latch bolt  110  remains in its extended position.  
         [0081]    [0081]FIG. 15 shows the latch bolt  110  in the locked position, in which the latch bolt  110  can be locked, by means of a latch blocking lever (not shown) embodied as in the embodiment shown in FIG. 5, against being retracted without authorization. The control of this latch blocking lever is then accomplished analogously via a motion of the drive rod  111 . This achieves increased protection against break-ins.  
         [0082]    [0082]FIG. 17 shows a further embodiment of a main lock box  202 , which is embodied as a full panic lock. This main lock box  202  again has both a handle follower  206  and a lock cylinder  207 . An actuating lever  210  is fastened, in a manner fixed against relative rotation, to the handle follower  206  and is provided with a journal  211  on its free end. This journal  211  engages a control cam  212  that is formed onto the control plate  218 . To that end, the control plate  218  has a pawl  213 , formed onto the edge of the control plate  218  in the direction of a lock faceplate  204  shown merely in suggestion fashion; this pawl is also inclined downward. In this way, the control cam  212  is likewise inclined not only in the direction of the faceplate  204  but also downward. If the handle follower  206  is rotated clockwise with a handle, not shown, then the journal  211  provided on the free end of the actuating lever  210  is swiveled upward in the direction of the arrow  214  and carries the pawl  213  of the control plate  218  along with it. In this process, the journal  211  slides along the control cam  212  and moves in the direction of the free end of the pawl  213 . Since the pawl  213  is inclined downward, the control plate  218  is raised additionally beyond the degree of inclination of the pawl  213 , supplementally to the usual reciprocating motion, by the shifting of the journal  211  in the direction of the free end of the pawl  213 . In this way, a step-up gear is formed, with which the control plate  218  is raised to a greater extent than the journal  211  of the actuating lever  210 .  
         [0083]    The pivoting of the actuating lever  210 , which causes a displacement of the control plate  218 , retracts the bolt  209 , which is connected to the control plate  218  via a journal-and-oblong-slot connection. The handle follower  206 , as already described for the other exemplary embodiments, is likewise provided with a handle follower disk  217 , which acts upon a tail  219  of the latch  208  via an arm  218 . A clockwise rotation of the handle follower  206  thus also causes a retraction of the latch  208  via its tail  219 . Thus if the door handle, not shown, is actuated, then at the same time the extended bolt  209  and the latch  208  are moved into their position in which they are retracted into the main lock box  202  (FIG. 18). The main lock box  202  shown in FIG. 17 thus has a full panic function.  
         [0084]    If the door handle is let go, then the latch  208  is pushed outward via the latch projection spring  220  into its latching position, as shown in FIG. 19, while conversely the bolt  209  remains in its retracted position, since the control plate  218  remains in the upward-displaced position and only the journal  211  lifts away from the control cam  212  and assumes its position of repose shown in FIG. 17.  
         [0085]    In addition to the control plate  218 , the main lock box  202  may as in the exemplary embodiment shown in FIG. 11 be provided with a further control plate  220 , which extends parallel to the control plate  218 . This second control plate is then likewise connected to the change lever  215  via a connecting rod (not shown). Second drive rods, corresponding to the exemplary embodiment of FIG. 11, may be coupled to the second control plate.  
         [0086]    On the side remote from the faceplate  204 , the control plate  218  is provided with toothing  221 , which meshes with a gear wheel  228  of the planetary gear, shown merely in suggested fashion. In other words, if the gear wheel  22  rotates, via the lock cylinder  207  and the planetary gear, then the control plate  218  is displaced via the toothing  221  meshing with the gear wheel  222 . In the same way, if the control plate  218  is displaced, the gear wheel  222  meshing with the toothing  221  and via this gear wheel the planetary gear and thus the lock cylinder  217  are restored to their previous position.