Patent Abstract:
A lock for a door including a latch bolt and a further bolt mounted in a housing for parallel displacement relative to the housing. A bearing is fixed in place in the housing and along with a turning element and a two-armed hinged lever, also mounted to the housing operate on the latch bolt and the further bolt. The two arms of the two-armed hinged lever are pivotably connected with each other at their free ends with one of the arms receiving the fixed bearing between its ends, and with one of the arms being connected to the turning element and the other of its arms being connected to the further bolt.

Full Description:
FIELD OF THE INVENTION 
     The present invention relates to a lock, and in particular a mortise lock for an exterior door. The door has a latch bolt and a further bolt located displaceably parallel with each other in a housing, wherein the further bolt can be operated by means of a key and/or a turning knob, and the latch bolt can be selectively operated by means of a latch with a follower or by means of a key or by means of a turning knob. 
     BACKGROUND OF THE INVENTION 
     A lock for an exterior door is known from German Patent Publication DE 92 08 526 U1. This known lock has a latch bolt which can be retracted into the lock housing by means of a follower on which the latch is fastened. A further bolt is located underneath the latch bolt, which can be unlocked from the lock housing by means of a profiled cylinder. In addition, the profiled cylinder can be pulled into the latch bolt by means of a changer. Such a lock was developed for the German, or the European market. 
     American locks have the peculiarity that, as a rule, the latch with the follower and latch bolt are arranged at the bottom and the further bolt at the top in the lock housing. Furthermore, as a rule the further bolt is operated by means of a key on the one side and a turning knob on the other side. Such locks have properties which are comparable with the locks mentioned at the outset. However, it is not possible to couple connecting rods with such locks, by means of which supplemental lock boxes, or respectively supplemental bolts are attached, through which the resistance of the door to break-ins could be increased. 
     OBJECT AND SUMMARY OF THE INVENTION 
     It is therefore an object of the present invention to provide the lock mentioned at the outset that meets the requirements of the American market and can be used in the same way as American locks, and that furthermore as many components as possible can be taken over, or respectively only small changes need to be made. 
     This object is attained in accordance with the present invention in that the further bolt is connected via a two-armed hinged lever with a turning element actuated by the key or turning knob, that one arm of the hinged lever is pivotably coupled with the turning element and the other arm pivotably with the further bolt, and that the two arms are pivotably connected with each other with their free ends, wherein one arm is rotatably and, if required displaceably, seated between its ends on a bearing fixed in place in the housing. 
     By means of this embodiment in accordance with the present invention a lock, which is based on the features of a European mortise lock, is made available for the American market. It is therefore possible to use a mortise lock having a known lock housing, known, for example, from German Patent Publication DE 92 08 526 U1. This lock is merely turned over, so that the latch bolt is at the bottom and the further bolt at the top. In order to obtain a correct turning direction for turning the further bolt forward, i.e. for extending it, with this turned-over lock, a reversal of the direction of turning is created by means of a hinged lever. The key, or respectively the turning knob, drives a first hinge arm of the hinged lever, which is pivotably fastened on the rotating element and can be rotated around a shaft fixed in place in the housing. A reversal of the turning direction is created in this way, which is transferred by the other end of this pivot arm to a second pivot arm, which acts on the further bolt and extends it out of the lock housing. With the lock in accordance with the present invention, the further bolt is extended in that the turning element is turned either by the lock or by the turning knob in the conventional direction, i.e. in that the upper half of the key, or respectively of the turning knob is turned in the locking direction. Such a mortise lock can also be connected with a connecting rod. 
     Further advantages, characteristics and details of the present invention ensue from the following description, wherein several exemplary embodiments are described in detail, making reference to the drawings. The features represented in the drawings as well as in the specification can be essential to the present invention both individually per se and in any arbitrary combination. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a top view of a first embodiment of a lock according to the present invention with the housing cover removed; 
     FIG. 2 is a top view of a second embodiment of a lock according to the present invention with the housing cover removed; 
     FIG. 3 is a top view of an enlarged representation of a supplemental bolt lock with the housing cover removed; 
     FIG. 4 is a top view of a further embodiment of a supplemental bolt lock with the housing cover removed; 
     FIG. 5 shows a section V—V through the supplemental bolt lock in accordance with FIG. 4; 
     FIG. 6 is a longitudinal section through a connecting rod extender with a gear; 
     FIG. 7 is a section taken along lines VII—VII through the connecting rod extender in accordance with FIG. 6; 
     FIG. 8 is a top view of a third embodiment of a lock according to present invention with the housing cover removed; 
     FIG. 9 is a top view of a fourth embodiment of a lock according to the present invention with the housing cover removed; 
     FIG. 10 is a top view of a fifth embodiment of a lock according to the present invention with the housing cover removed; and 
     FIG. 11 is a top view of a further supplemental bolt lock according to the present invention, partially in section. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     A lock housing, identified as a whole by  1  and with the cover removed, is shown in FIG. 1. A latch bolt  2  and a further bolt  3  in the interior of the housing can be displaced in the direction of the double-headed arrow  4 . Furthermore, a follower  5  is seated, rotatable in the direction of the double-headed arrow  6 , in the lock housing  1 . The follower  5  has an opening  7 , in particular a square opening, for receiving a square pin of a latch or similar actuating element. A radially extending shoulder  8  of the follower  5  is located underneath a protrusion  9  of a latch bolt arm  10 , by means of which the latch can be turned back. Furthermore, the follower  5  has a partial gear ring  11 , which engages a toothed rack  12 , which is held in the standby position represented in FIG. 1 by means of a restoring spring, not shown, located in a spring housing  13 . The toothed rack  12  can be displaced in both directions from this standby position. If therefore the follower  5  is turned in the direction of the arrow  14 , this causes a compression of the restoring spring on the one hand and, on the other, the shoulder  8  comes to rest against the protrusion  9  of the latch bolt arm  10  and pivots the latter in a clockwise direction around a bearing  15 . By means of this action an actuating arm  16  is displaced and engages a shoulder  17  of a latch bolt tail  18 . This causes the latch bolt  2  to be turned back into the lock housing  1  in the direction of the arrow  19 . The extension of the latch bolt  2  after the latch has been released and after the restoration of the follower  5  by means of the restoring spring, not shown, is aided by a torsion spring  20 , which is supported on the one side on the lock housing  1 , and acts on the shoulder  17  with the other leg and pushes the latch bolt  2  out of the lock housing  1 . In this case the extension movement is approximately 10 mm. 
     Furthermore, a turning element  21  is rotatingly seated in the lock housing  1 , wherein the turning element  21  is provided with a slit  22 . A corresponding wedge of a turning knob engages this slit  22  on the one side, for example, and on the other side a corresponding wedge of a cylinder, which can be actuated by means of a key. In this case the turning element  21  is designed in such a way that it can be installed in already existing recesses, into which a profile cylinder can be inserted. A first arm  23  of a hinged lever  24  is fastened, pivotable around a bolt  25 , on the turning element  21 . The first arm  23  furthermore has an elongated hole  26 , which is engaged by a pin  27  fixed in place on the housing. On the side opposite the bolt  25 , the first arm  23  is pivotably connected via a pivot bearing  28  with a second arm  29 , wherein the second arm  29  acts on a bolt tail  31  of the further bolt  3  by means of a bolt  30 . A torsion spring  32  is seated around the bolt  30  and is supported by means of its leg  33  in a receptacle  34  of the further bolt  3 , while with its other leg  35  it extends around the pivot bearing  28 . The torsion spring  32  is laid out in such a way that the pivot bearing  28  is urged around the bolt  30  in a clockwise direction. 
     The lock in accordance with a first exemplary embodiment represented in FIG. 1 has the important advantage that, in the manner of American locks, it has a latch bolt  2  on the bottom and a further bolt  3  at the top, wherein the further bolt  3  can be moved forward out of the key housing by actuating the turning element  21  by means of a key or by means of a turning knob in a clockwise direction (in the position represented). In this case the extension is approximately 25 mm. 
     The forward displacement of the further bolt  3  by rotating the turning element  21  in a clockwise direction takes place in that in the course of rotation of the turning element  21 , the first arm  23  is taken along by the bolt  25  and turned in a counterclockwise direction around the pin  27 , and in addition is displaced in the direction toward the elongated hole  26 . This causes the second arm  29  to be displaced essentially in the extension direction of the further bolt  3  (toward the right). In addition, the bolt or pivot bearing  28  performs an arc-shaped movement suggested by the dashed line  36 . On its side facing away from the viewer, the pivot bearing  28  has an axial protrusion which, in the position of the hinged lever  24  represented in FIG. 1, extends behind a shoulder  37  fixed in place on the housing. In this way displacement of the further bolt  3  out of the lock housing  1  is prevented without actuation of the turning element  21 . In the end position of the pivot bearing  28  with the further bolt  3  extended, not shown in FIG. 1, the axial protrusion of the pivot bearing  28  is located behind a second shoulder  38  fixed in place on the housing, by means of which it is accomplished that the extended further bolt  3  cannot be pushed back into the lock housing  1  without rotating the turning element  21 . 
     FIG. 2 represents a second exemplary embodiment of the lock in accordance with the present invention, wherein like components are identified with the same reference numerals. In this exemplary embodiment a connecting rod plate  39  is seated in the lock housing  1  and is moveable in the direction of the two-headed arrow  40 . Connecting rods  43  are connected at  41  and  42  to this connecting rod plate  39 . These connecting rods  43  are located behind cover rails  44  which, in the installed position of the lock  1 , finish and cover it on the visible side. 
     In FIG. 2, a turning slider  45  is rotatably fastened to the follower  5 . If the follower  5  is activated, the turning slider  45  is taken along, which will be explained further below. The turning slider  45  has a bolt  46 , which engages an elongated hole  47  in the connecting rod plate  39 . The turning slider  45  furthermore has a curved elongated hole  48 , by means of which the bearing  15  is bypassed. 
     Thus, if the follower  5  is moved counterclockwise, for example, the protrusion  9  of the latch bolt arm  10  is taken along by the shoulder  8  and is moved around the bearing  15  in a clockwise direction, as a result of which the latch bolt  2  is pushed into the lock housing  1 . Furthermore, the turning slider  45  is pivoted by the rotating movement of the follower  4  and the bolt  46  is displaced upwardly, as a result of which the connecting rod plate  39  is also displaced upwardly. In this way, the connecting rods  43  are pushed upwards. 
     A supplemental lock  49  is represented in FIG. 3, wherein the cover has also been removed. This supplemental lock  49  is connected with the lock housing  1  of the mortise lock by means of the connecting rod  43 . A latch bolt  50  is seated, displaceable in the direction of the two-headed arrow  51 , in the supplemental lock  49 . In the representation shown, this latch bolt  50  is in its turned-forward position. The latch bolt  50  has a latch bolt tail  52  including a protrusion  53 . 
     It is furthermore possible to see in FIG. 3, that a latch bolt detent lever  55  is pivotably seated around a bearing bolt  54 , and is spring-loaded in a clockwise direction by means of a detent lever spring  56  embodied as a torsion spring. If the latch bolt  50  is in the completely extended position, i.e. in the locking position, a latch detent edge  57  extends around the protrusion  53 . Although a short gap can exist between the protrusion  53  and the latch detent edge  57 , as represented in FIG. 3, the latch detent edge  57  extends into the displacement track of the protrusion  53 , so that the latch bolt  50  cannot easily be inserted into the housing of the supplemental lock  49 . Thus, in its locked position the latch bolt  50  is locked against unauthorized insertion. 
     If a latch restoration lever  58 , which rests with its one arm  59  against the free end of the connecting rod  43 , and with its other arm  60  against a further protrusion  61  of the latch bolt tail  52 , is pivoted via the connecting rod  43 , a protrusion  62  of the free arm  60  engages a crank  63  of the latch bolt detent lever  55  and lifts it sufficiently out of its locked position in which the latch detent edge  57  extends behind the protrusion  53 , so that the latch detent edge  57  moves out of the displacement track of the protrusion  53 . The arm  60  furthermore rests against the protrusion  61  and, in the course of the pivoting of the latch restoration lever  58 , it pulls the latch bolt  50  into the supplemental lock  49 . The extension of the latch bolt  50  takes place by means of a latch extension lever  64 , which is seated at the bearing  65  and is driven in a counterclockwise direction around the bearing  65  by a latch extension spring  66 . With its free end, the latch extension lever  64  acts on the latch bolt  50  and attempts to move it out of the supplemental lock  49 . 
     Now, if the follower  5  (FIG. 2) is moved into the locking position (turned in a clockwise direction), the latch bolt  50  of the supplemental lock  49  is turned forward. Since the shoulder  8 , by means of which the turning slider  45  is taken along, moves in a curved cutout  67 , the turning slider  45 , and therefore also the connecting rod plate  39 , remains in the deflected position when the follower  5  is restored into the initial position, represented in FIG. 2, by means of the restoring spring. The latch bolt  50  therefore remains extended. 
     If the follower  5  is moved in a counterclockwise direction by pushing down the latch, the latch bolt arm  10 , for one, and the turning slider  45 , for another, are moved via the shoulder  8 , as represented in FIG. 2, and thereby the latch bolt  2  is turned back and the connecting rod plate  39  is pushed into its initial position, as a result of which the arm  59  of the latch restoration lever  58  is moved via the coupled connecting rod  43  in that a slider  68  acts on a protrusion  69  of the arm  59  and pivots it in a counterclockwise direction. In the process and as described above, following the unlocking of the latch bolt  50  the arm  60  pulls the latch bolt  50  back over the protrusion  61  into the housing of the supplemental lock  49 . 
     A second exemplary embodiment of the supplemental lock  49  is represented in FIG.  4 . With this supplemental lock  49  the latch bolt  50  is automatically pushed out of the lock housing when the door is closed. To this end the latch bolt  50  is provided with a groove  70 , extending in its longitudinal direction and open at one side. A detent element  71  is located in this groove  70 , which is seated, pivotable around a clamping sleeve  72 , in the groove  70  and therefore in the latch bolt  50 . This detent element  71  is provided with a detent protrusion  73  as well as with a triggering protrusion  74 . 
     In the latch position represented in FIG. 5, the detent protrusion  73  extends behind the cover rail  44  and prevents further extension of the latch bolt  50 , which is spring-loaded. This spring force, as already mentioned above, is provided by the latch extension spring  66  (FIG.  4 ), which has been pushed onto a guide pin and is supported on the one side on the inner wall of the housing of the supplemental lock  49  and on the other side on the latch extension lever  64 . This latch extension lever  64  is pivotably seated in the bearing  65 . The end of the latch extension lever  64  opposite the bearing  65  acts on the end of the detent element  71  located opposite the trigger protrusion  74  and urges it in the extension direction under the force of the latch extension spring  66 . Since the detention element  71  is connected via the clamping sleeve  72  with the latch bolt  50 , the latter is also urged in the extension direction. It can be seen in FIG. 5 that, although the latch extension lever  64  acts on the detent element  71 , the direction of the force of the latch extension lever  64  does not pass through the pivot bearing of the detent element constituted by the clamping sleeve  71 , so that the latch extension lever  64  exerts a pivot moment in the clockwise direction on the detent element  71 . The detent protrusion  73  as well as the triggering protrusion  74  are pivoted out of the groove  70  by means of this pivot moment. 
     With the door open (not shown), the latch bolt  50  is therefore in the latch position represented in FIGS. 4 and 5, in which a further extension is prevented because the detent protrusion  73  extends behind the cover rail  44 . 
     In the course of closing or pushing the door closed, the latch bolt  50  is inserted into the supplemental lock  49  over the locking plate attached to the door frame, not shown. If the door is in its closed position and the latch bolt  50  is aligned with a latch opening in the locking plate on the side of the door frame, the fully inserted latch bolt  50  is pushed out of the supplemental lock  49  by means of the latch extension lever  64 . In the course of this extension movement, the locking element  71  is simultaneously pivoted in a clockwise direction around the clamping sleeve  72 . In the process, the trigger protrusion  74  comes into contact with the edge of the latch opening of the locking plate facing it, as a result of which the detent element  71  is pushed against the pivot moment sufficiently far into the groove  70 , so that the detent protrusion  73  can slide past the cover rail  44 . An arrestment of the latch bolt  50  in the latch position in accordance with FIG. 5 is prevented in this way, so that the latch bolt  50  can be extended into the locking position. In this locking position the latch bolt  50  has been extended approximately 10 mm 15 mm farther out of the supplemental lock  49  than in the latch position in accordance with FIG.  5 . 
     There is a suggestion in FIG. 2, that the latch tail  31  be provided with a detent extension  75  on its underside, which projects downwardly and is seated, displaceable in the direction of the two-headed arrow  4 , in a receiving groove  76  fixed in place on the housing. The further bolt  3  is guided by this detent extension  75 . Furthermore, when turning the further bolt  3  forward (not shown), the detent extension  75  is pushed out of the receiving groove in the extension direction sufficiently far, so that it extends behind a shoulder  78  of the connecting rod plate  39 , as represented by the dash-dotted line  77 . With the further bolt  3  turned forward, the connecting rod plate  39  is essentially fixed in place in this manner in the position represented in FIG.  2 . With its cutout  79 , the connecting rod plate  39  can only be displaced between the detent extension  75  ( 77 ) and a guide block  80 , which is fixed in place on the housing. However, the connecting rod plate  39  can no longer be displaced backward, i.e. upward. When the further bolt  3  has been extended by means of a key, opening of the lock can no longer be accomplished by actuating the follower  5 . 
     A rack extension  81  is represented in FIGS. 6 and 7, which is coupled by means of a coupling  82  with a connecting rod  43 , not shown. This coupling  82  is located on a first toothed rack  83 , which terminates in the housing  84  of the rack extension  81 . The first toothed rack  83  drives two gear wheels  85  seated in journals  86  fixed in place on the housing. A second toothed rack  87  is driven by means of these gear wheels  85 , which now moves opposite with respect to the first toothed rack  83 . Thus, a reversal of direction is provided by means of these gear wheels  85 . The second toothed rack  87  transmits the movement to two pairs of gear wheels  88  seated on journals  89 . The smaller gear wheels  90  of these pairs of gear wheels  88  are driven by means of the second toothed rack  87 . To this end the toothed rack  87  is provided with a toothed rack element  91  which is embodied to be considerably more narrow than the toothed rack  87 , but has a greater thickness, which can be seen in FIG. 6. A third toothed rack  92  located laterally next to the toothed rack element  91 , is of lesser thickness and meshes with the larger gear wheel  93  of the pair of gear wheels  88 . Together with the gear wheel pair  88 , the toothed rack element  91  and the third toothed rack  92  constitute a transmission gear, so that the displacement movement of the connecting rod  43  generates an extension of the detent pin  94  of approximately 25 mm. This detent pin  94  is connected via a hook connection  95  with the third toothed rack  92 , wherein the lower end of the detent pin  94  is loaded in the extension direction by means of a compression spring  96 . It is possible in this way to uncouple the detent pin  94  from the further extending third toothed rack  92  at the completion of extension, so that damage to the transmission gear, or respectively the rack extension  81  are prevented in general. 
     The exemplary embodiment represented in FIG. 8 shows a further variant of the mortise lock in accordance with the present invention, wherein the connecting rod plate  39  is provided with a crank  97 . A guide pin  101 , which projects from a bolt extension  102 , acts on this crank  97 , which is being constituted by an obliquely extending section  98  and a section  99  extending in the direction of the two-headed arrow  40 , as well as an end section  100  orthogonally with respect to it. If the further bolt  3  is actuated by means of the turning element  21 , i.e. by means of a key or the turning knob, which has been described further above, the guide pin  101  is moved in the crank  97 . In the course of turning the further bolt  3  forward, the guide pin  101  is displaced in the direction of the arrow  103 . This leads to a movement of the guide pin  101  in the oblique section  98 , as a result of which connecting rod plate  39  is displaced downwardly until the guide pin  101  comes to lie in the end section  100 . It is possible in this way to actuate the connecting rod  43  by moving the further bolt  3  forward, actuated by a key or the turning knob. Furthermore, in the extended position of the further bolt  3 , the connecting rod plate  39  is blocked in that, as described in connection with FIG. 2, the detent extension  75  represented there extends behind the shoulder  78  of the connecting rod plate  39 . 
     A further variant of the lock in accordance with the present invention is represented in FIG. 9, wherein the forward movement of the further bolt  3  takes place by actuation of the follower  5  in a clockwise direction. Such a lock is also called a “fast lock”. With this lock the connecting rod plate  39  also has a crank  104 , which has an oblique section  98 , but has an end section  105  extending in the direction of movement of the connecting rod plate  39 . The guide pin  101  is guided in this crank  104 . If now the follower  5  is turned in a clockwise direction, the bolt  46 , which engages an elongated hole  47  of the connecting rod plate  39 , is moved downward via the turning slider  45 . This causes the guide pin  101  to be displaced in the extension direction of the further bolt  3  in the oblique section  98 , which is also moved downward, as a result of which the further bolt  3  is moved forward. In the process, a toothed rack  108  of the bolt tail  31  meshes with a pinion  107 , which in turn meshes with a crown gear  106  of the turning element  21 . The turning element  21  is rotated in this way past the bolt extension, as a result of which the arm  23  of the hinged lever  24  is rotated in a counterclockwise direction around the journal  27 , so that the pivot bearing travels the curved track  36  described in FIG.  1  and therefore the axial protrusion moves around the shoulder  37  fixed in place on the housing and comes to lie behind the shoulder  38 . The further bolt  3  is secured against unauthorized retraction by this shoulder  38 . 
     However, this bolt extension can also take place in that the turning element  21  is rotated, so that the crown gear  106  meshes with the toothed rack  108  of the bolt tail  31  and the bolt  3  is moved forward in this way. However, with the further bolt  3  extended, the toothed rack  108 , which is made appropriately short, comes out of engagement with the pinion  107  in every case. If an attempt is now made to displace the connecting rod plate  39  upward, i.e. in the opening direction, by turning the follower  5  in a counterclockwise direction, this movement is blocked by the shoulder  38 , fixed in place on the housing, with which the axial protrusion of the pivot bearing  28  comes into contact. The bolt can therefore not be pushed back past the latch, or respectively the follower  5 . Therefore unlocking can only exclusively be performed via the turning element  21 , i.e. by means of a key or by means of the turning knob. To this end the turning element  21  is provided with a ratchet constituted by two disks equipped with saw teeth on the sides facing each other. These saw teeth are arranged in such a way that they are permanently in engagement in one direction and, in the other direction of rotation, become disengaged starting at a defined torque. 
     Locking of the further bolt  3  by means of the shoulder  38  fixed in place on the housing is cancelled in that the turning element  21  is rotated counterclockwise in the opening direction. Since the pinion  107  is out of engagement with the toothed rack  108 , the latter, and therefore the further bolt  3 , are not taken along. Although the arm  23  of the hinged lever  24  is pivoted, the released pivot bearing  28  opens and becomes disengaged from the arm  29 . In FIG. 9 the arm  29  has not been drawn in for the sake of clarity. Since the pivot bearing  28  moves on the curved track  36 , the axial protrusion comes free of the shoulder  38  and is displaced behind the shoulder  37 . The further bolt  3  remains extended, but is no longer secured. It is now possible to displace the connecting rod plate  39  upward by pushing the latch down and to pull back the further bolt  3  via the crank  104 . In the process the  1 s toothed rack  108  again comes into engagement with the pinion  107  and drives it and therefore also the crown gear  106 . Since the turning element  21  is already in its end position assigned to the open position, the ratchet is actuated, so that no damage of the turning element  21  occurs. 
     A further exemplary embodiment of the lock in accordance with the present invention is represented in FIG. 10, wherein the latch bolt  2  has the structure corresponding to the latch bolt  50  represented in FIGS. 4 and 5. If a door with such a lock  1  is closed, the blocking of the blocking element  109  is automatically cancelled and the latch bolt  2  is moved forward by the force of a compression spring  110  acting on the latch bolt tail  18 . In the process, the actuating arm  16  of the latch bolt arm  10  is pivoted counterclockwise around the bearing  15 . The latch bolt tail  18  furthermore has a protrusion  111 , which acts on a blocking lever  112 , which can be pivoted around a bolt  113  fixed in place on the housing. This blocking lever  112  extends behind the free end  114  of the connecting rod plate  39  and blocks it against a downward displacement, in which direction the connecting rod plate  39  is loaded by a compression spring  115 . If, however, the blocking lever  112  is pivoted in a clockwise direction around the bolt  113  past the protrusion  111 , the engagement behind the free end is cancelled and the connecting rod plate  39  can be displaced downwardly. 
     With the fully automatic extension of the latch bolt  2 , the latch bolts  50  coupled with the connecting rod  43  are also extended. A simple latch bolt  50  of this type is represented, for example, in the supplemental lock  49  in FIG. 11, wherein the latch bolt  50  is guided via a guide pin  116  in an elongated hole  117  of the housing cover  118  as well as in the crank  119  of a drive plate  120 . This drive plate  120  is coupled with the connecting rod  43 . 
     The lock in accordance with the present invention has the essential advantage of having a multitude of conventional components, but can still be used in the US market.

Technology Classification (CPC): 8