Abstract:
An improved structure for a latch lock that opens or closes a door without deadlocking it essentially comprised of a front body and a rear body each provided with a round plate locked into to each other with the latch bolt inside a recess of a door panel being placed in a space defined by both locked bodies; a rotation rod with a flange being each adapted to the front and the rear bodies having one end of the rotation rod inserted into a bolting hole in the latch bolt and the other end inserted with a reducing spring and a positioning ring for the rotation rod to be respectively inserted into the front and the rear bodies to allow spacing adjustment as desired to compromise door panel thickness.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    (a) Field of the Invention The present invention is related to an improved latch lock, and more particularly to one that opens or closes a door without deadlocking it.  
           [0002]    (b) Description of the Prior Art  
           [0003]    Whereas, the thickness of a door panel in an average home is in a given specification, there are the cases that the thickness may vary depending on the design or manufacturing error. However, door latch locks generally available in the market are designed in a fixed specification. That is, the combination of a latch bolt with a front body and a rear body are provided in a fixed dimension that prevents from proper adjustment as required. Accordingly, the variance in the thickness of the door panel usually frustrates the installation of the latch lock.  
         SUMMARY OF THE INVENTION  
         [0004]    The primary purpose of the present invention is to provide a latch lock that is adjustable by compromising the thickness of a particular door panel. To achieve the purpose, the present invention is comprised of a front body, a rear body and a latch bolt. An insertion part formed by multiple erected walls arranged in circle at a given spacing from one another are respectively provided to the front and the rear bodies for both bodies to lock into each other. A rotation rod inserted into the latch bolt is each provided in the front and the rear bodies. The rotation rod is adapted with a spring and a positioning ring. One end of the rotation rod penetrates together with the positioning ring through and out of the respective body for the positioning ring to engage with the body with a nut while the spring is provided between the latch bolt and the body. Accordingly, the spacing between the front and the rear bodies can be adjusted as desired depending on the thickness of the door panel to achieve the perfect installation of the latch lock.  
           [0005]    The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.  
           [0006]    Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0007]    [0007]FIG. 1 is an exploded view of a preferred embodiment of the present invention.  
         [0008]    [0008]FIG. 2 is a schematic view showing the assembly process of the preferred embodiment of the present invention.  
         [0009]    [0009]FIG. 3 is a schematic view showing the preferred embodiment of the present invention is completed with its assembly.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0010]    The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.  
         [0011]    Referring to FIGS. 1, 2, and  3 , a preferred embodiment of the present invention is essentially comprised of a front body  10 , a rear body  20  and a latch bolt  30 . The latch bolt  30  related to a prior art is first placed in a recess  402  of a door panel  40  with the head of the latch bolt exposed out of the door panel  40 . A bolting hole  301  is provided at the terminal of the latch bolt  30  at where close to a locking hole  401  of the door panel  40  so to receive the insertion by a rotation rod. The front body  10  and the rear body  20  are designed in relative configuration and are respectively adapted with a rotation rod  11  ( 21 ), a positioning ring  12  ( 22 ), a spring  13  ( 23 ), a nut  14  ( 24 ), arose  15  ( 25 ) and a handle  16  ( 26 ). Both of the front and the rear bodies  10 ,  20  are respectively provided with an insertion part adapted with multiple erected walls  101 ,  201  arranged in circle at a given spacing from one another formed by multiple erected walls arranged in a circle at a given spacing from one another with the diameter of the insertion part  101  from the front body  10  greater than the insertion part  102  from the rear body  20  for the insertion part  102  to be inserted into the insertion part  101  while two gaps  1011 ,  2011  are respectively provided on the same side of both insertion parts  101 ,  201 . When both of the front and the rear bodies are locked into to each other, the latch bolt  30  penetrates through both gaps  1011 , 2011  of the insertion parts  101 ,  201  to execute retractable slide. Two axial holes  102 ,  202  are respectively provided at the center of the round plate of the front and the rear bodies  10 ,  20 , and on both sides of the axial hole  102  ( 202 ) at where appropriately are each provided with a locking hole  103  ( 203 ) comprised of two holes in different diameters overlapped onto each other. A screwed hole  2012  is each provided on both sides of the insertion part  201  of the rear body  20  and two corresponding round holes  104  are provided on the round plate of the front body  10 . Two bolts are used to incorporate both of the front and the rear bodies  10 ,  20 . The rotation rod  11 ( 21 ) related to a square rod has a flange  111  ( 211 ) formed at where closes to the terminal of the rotation rod  11  ( 21 ), and a long positioning groove  112  ( 212 ) is provided on the surface of the rotation rod  11  ( 21 ) to allow the terminal of the rotation rod  11  ( 21 ) to be inserted into the bolting hole  301  of the latch bolt  30 . Another end of the rotation rod  11  ( 21 ) is respectively inserted with a reducing conic spring  13  ( 23 ) immediately followed by the insertion of a graded positioning ring  12  ( 22 ). The gradation on the positioning ring  12  ( 22 ) is formed with two layers in different diameters, and a positioning bolt  121  ( 221 ) winds sideway into the layer in larger diameter of the gradation of the ring  12  ( 22 ) and deep into the positioning groove  112  ( 212 ) of the rotation rod  11  ( 21 ) without tightly packing against the rotation rod  11  ( 21 ) to allow the positioning ring  12  ( 22 ) slide for a certain distance in the groove  112  ( 212 ). Both rotation rods  11 ,  21  are respectively inserted through the axial holes  102 ,  202  in the front and the rear bodies  10 ,  20 . Both of the layers in smaller diameter of the graded positioning rings  12 ,  22  also respectively penetrate through their corresponding axial holes  102 ,  202 , and both of the layers in greater diameter of the graded positioning rings  12 ,  22  respectively hold against inside their corresponding axial holes  102 ,  202 , then fastened respectively to the layers in smaller diameter of the graded positioning rings  12 ,  22  with a nut  14 . Accordingly, both of the graded positioning rings  12 ,  22  are respectively fastened to corresponding axial holes  102 ,  202  and both springs  13 ,  23  are respectively provided between the round plates of the front and the rear bodies  10 ,  20  and their flanges  111 ,  211  to allow the front and the rear bodies  10 ,  20  to respectively slide on the rotation rods  11 ,  21  in a distance being subject to the length of the positioning groove  112 ,  212 . Furthermore, two flexible clamps  17 ,  27  are respectively fixed inside the locking holes  103 ,  203  of the front and the rear bodies  10 ,  20 .  
         [0012]    Now referring to FIGS. 2 and 3, upon completing the assembly of the front and the rear bodies  10 ,  20 , the terminals of the rotation rods  11 ,  21  are respectively inserted through their corresponding locking holes  401  in front of and behind the door panel  40  into the bolting hole  301  of the latch bolt  30  inside the recess  402  of the door panel  40 . Both insertion parts  101 ,  201  of the front and the rear bodies  10 ,  20  are locked into to each other while pressure is applied on both round plates of the front and the rear bodies  10 ,  20  tightly against the door panel. Two bolts  50  are put through both round holes  104  of the front body  10 , then through both screwed holes  2012  of the rear body  20  so to lock up both of the front and the rear body  10 ,  20  to the door panel. Both roses  15 ,  25  each provided with multiple studs  151 ,  251  on the inner side are respectively placed on the round plates of the front and the rear bodies  10 ,  20  for those studs  151 ,  251  to be merely inserted into the holes in greater diameter in those multiple corresponding latching holes  103 ,  203  provided on the round plate of the front and the rear bodies  10 ,  20 . Both roses  15 ,  25  are turned to cause those multiple studs  151 ,  251  to falling into the holes in smaller diameter in those multiple corresponding latching holes  103 ,  203 , and those multiple studs  151 ,  251  are tightly clamped by those flexible clamps  17 ,  27  respectively provided inside the latching holes  103 ,  203  to prevent those multiple studs from being displaced due to external force applied. Both handles  16 ,  26  each provided with a square connection hole  161 ,  261  are mounted with the insertion by both rotation rods  11 ,  21  and two screws  162 ,  262  are used to lock up both handles  16 ,  26  for the present invention to provide a latch lock with more particle benefits by allowing the most precise assembly of a latch lock applicable to door panels of various thickness.  
         [0013]    It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.  
         [0014]    While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.