Abstract:
An improved bolt dock for a door lock and particularly a bolt dock capable of locking automatically when the door is closed and preventing the bolt from deforming mainly consists of an upper bolt set and a lower bolt set covered by a lid to couple with an inner handle and an outer handle to be installed on a door. The bolt dock thus made can achieve safe locking and increase the durability of the door lock.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to an improved bolt dock for a door lock, and particularly a bolt dock that is capable of locking automatically when the door is closed and preventing the bolt from deforming. 
     2. Description of the Prior Art 
     A conventional door lock  1  as shown in FIG. 1 generally includes an outer handle  11 , an inner handle  12  and a bolt assembly  13 . The bolt assembly includes a dead bolt  131  and a latch bolt  132 . As the latch bolt  132  is smaller and tends to occur deformation after being used for a period of time, the durability of the entire door lock  1  is affected. Moreover, a general door lock  1  is required to lock automatically after the door is closed. Otherwise people who forget to lock the door inadvertently or leave the houses in a hurry without locking the door could make the house a tempting target for burglars and villains, and result in serious risks and safety concerns to the properties and people living in the house. 
     SUMMARY OF THE INVENTION 
     In view of the aforesaid disadvantages, the primary object of the invention is to provide an improved bolt dock for door locks that automatically locks the door when the door is closed, and prevents the bolt from deforming to achieve safe locking and increase service life of the lock. 
     The invention mainly includes a bolt dock that has an upper bolt set and a lower bolt set covering by a lid to couple with an inner handle and an outer handle for installing on a lock opening of a door to ensure safe locking and achieve longer durability of the lock. 
    
    
     The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings. 
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a schematic view of the bolt of a conventional door lock. 
     FIG. 2 is an exploded view of the invention. 
     FIG. 3 is a schematic view of the bolt dock of the invention. 
     FIG. 4 is a schematic view of the axle member of the invention. 
     FIG. 5 is a schematic view of an embodiment of the invention. 
     FIG. 6 is a schematic view of the invention in an operating condition −1. 
     FIG. 7 is a schematic view of the invention in an operating condition −2. 
     FIG. 8 is a schematic view of the invention in an operating condition −3. 
     FIG. 9 is a schematic view of the invention in an operating condition −4. 
     FIG. 10 is a schematic view of the invention with the lower bolt in another direction and in an operating condition. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Referring to FIGS. 2,  3 ,  4  and  5 , the invention mainly includes a bolt dock  21  which has an upper bolt set  3  and a lower bolt set  4  that are covered by a lid  22 , then are coupled with an outer handle  5  and an inner handle  6 , and are installed on a door, wherein: 
     the bolt dock  21  has a casing which has a face plate  210  and a guard plate  210 ′ located on one side. The face plate  210  and the guard plate  210 ′ have respectively a plurality of fastening holes  211  and  211 ′ located on the upper side and the lower side, and an upper bolt opening  212  and  212 ′, and a lower bolt opening  213  and  213 ′. The holes and openings on the face plate are corresponding to that on the guard plate. Inside the bolt dock  21 , there are a plurality of struts F 1 , F 2 , F 3 , F 4  and F 5  each has a screw hole formed therein, and a plurality of axle holes  215 , G 1  and G 2 . The bolt dock  21  further has a guide rail  216  located at a lower section below the center and a stop plate  217  located above the upper bolt opening  212 . There is also a retaining plate  218  located on an upper section above the center of the bolt dock  21  corresponding to the upper bolt opening  212 ; 
     the lid  22  corresponds to the bolt dock  21  and has a plurality of axle holes G 3 , G 4  and  221 , and a plurality of apertures H corresponding to the struts F 1 , F 2 , F 3 , F 4  and F 5  to receive screws I for fastening. At the center of the lid  22 , there is a transverse slide flute  222 ; 
     the upper bolt set  3  includes: 
     an upper bolt  31  for running through the upper bolt openings  212  and  212 ′ of the bolt dock  21 , and having a sloped surface  311  on one side and a fastening section  312  extending from another side. The fastening section  312  has two fastening holes  313 ; 
     a slide shank  32  having one side extended to form a ram head  325  and another side formed a wedge trough  321  to couple with the fastening section  312  of the upper bolt  31 . The wedge trough  321  has a side wall with two fastening holes  323  formed thereon to engage with screws A. The slide shank  32  further has a longitudinal trough  322  formed on an inner side of the wedge trough  321  and a transverse trough  324  normal to the longitudinal trough in a staggered manner. The transverse trough  324  has one end receiving the retaining plate  218  to form a retaining position. The transverse trough  324  houses a spring B 1 . A cover plate  36  with two round holes  361  is provided to cover the longitudinal trough  322  and is fixedly mounted thereon by means of two rivets  362 . On the upper side of the longitudinal trough  322 , there is a retaining flange  328 ; 
     an axle member  33  having a hollow barrel  330  with a square opening  333  formed therein, an upper bucking arm  331  extending upwards and a lower bucking arm  332  extending downwards. The upper bucking arm  331  has one side forming a stub shaft  334 , and a round hole  335  for receiving one end D 21  of a spring D 2 . The hollow barrel  330  has a bottom rim  336  on another side with a notch  337  formed thereon. The axle member  33  is located between the bolt dock  21  and the lid  22  and is coupled with the axles holes  215  and  221 ; 
     a trigger plate  34  formed in an arched shape having an axle hole  341  on one end to couple with one end of an axle C 1  and a bucking flap  342  located on another end and bent downwards to press an inner rim of the ram head  325  of the slide shank  32 ; and 
     a swing plate  35  having one side extended to form an elongated arm with a tip  354  to press against a side wall  329  of the slide shank to form a brake and a rear end formed a claw  351  to latch on the notch  337  of the axle member  33 , and is movable on the perimeter of the axle member  33 . The swing plate  3  further has an axle hole  352  for coupling with the strut F 3  of the bolt dock  21  that also is coupled with a torsional spring D 1 , and a lug  353  to latch one end of the torsional spring D 1 ; 
     the lower bolt set  4  includes: 
     a lower bolt  41  for running through the lower bolt openings  213  and  213 ′ of the bolt dock  21  having one side formed a sloped surface  411  and another side extending rearwards to form a stem  412  for coupling with a spring B 2 . The stem  412  has a groove  413 ; 
     a slide member  42  coupling on the guide rail  216  of the bolt dock  21  and having a semicircular trough  421  formed on a front end at the right side to house the stem  412  of the lower bolt  41  and the spring B 2  and a wedge plate  45  engaged with the stem, and another semicircular trough  422  formed on the rear end to house another spring B 3 . The slide member  42  further has a ridge  423  formed on the left side to couple with the slide flute  222  of the lid  22  for moving horizontally within a limited distance. The slide member also has a retaining axle  424  located on an upper side; 
     a push arm  43  having one end formed an axle hole  431  to couple with the strut F 5  of the bolt dock  21  and another end formed a cavity  432  to hold one end of the spring B 3 . The cavity  432  also couples with the guide rail  216  of the bolt dock  21 . There is a trough  433  formed on one side of the cavity  432  to hold one end of the torsional spring D 1 ; 
     a rocker plate  44  formed like a hook having an axle hole  441  on the corner section and a notch  442 . The axle hole  441  is coupled with a pintle C 2  which is also coupled with the axle hole G 1  of the bolt dock  21  and the axle hole G 3  of the lid  22 , and is located therebetween; and 
     a wedge plate  45  having a notch  451  formed on one side to clip the groove  413  of the stem  412  of the lower bolt  41  and a bent flap  452  on another side to latch on the slide member  42 ; 
     the outer handle  5  is located on the outer side of the door to form a chain movement with the upper bolt set  3 , the lower bolt set  4  and the inner handle  6  through a linkage rod  7 , and is coupled with a plurality of connecting struts E to fasten respectively the outer handle  5  and the inner handle  6  to the outer side and the inner side of the door; and 
     the inner handle  6  is located on the inner side of the door to form a chain movement with the upper bolt set  3 , the lower bolt set  4  and the outer handle  5  through the linkage rod  7 , and is coupled with a plurality of connecting struts E to fasten respectively the outer handle  5  and the inner handle  6  to the outer side and the inner side of the door. 
     By means of the construction set forth above, when the door is closed, the door lock of the invention will lock automatically, and deformation may be prevented from occurring to the bolt. 
     Operation of the invention is as follows: 
     1. Referring to FIG. 6, when the door lock is in a locked condition, the lower bolt  41  cannot be extended outwards due to no space is formed to accommodate it on the door, therefore it compresses the spring B 2  and B 3  and is retracted into the bolt dock  21  in the slide flute  222  of the lid  22 , while the upper bolt  31  is fully extended outwards. 
     2. When to open the door, turn the inner and outer handle  6  and  5  simultaneously, the outer handle  5  turns the linkage rod  7  which turns the axle member  33  and the inner handle  6 , and the claw  351  of the swing plate  35  escapes from the notch  337  of the axle member  33  and moves on the perimeter of the axle member  33  to a lower elevation, and the tip  354  of the swing plate  35  no longer latches on the lower side wall  329  of the slide shank  32 . Therefore the slide shank  32  is moved by the trigger plate  34  and retracts rearwards (as shown in FIG.  7 ). 
     3. Then the stub shaft  334  of the upper bucking arm  331  of the axle member  33  pushes the trigger plate  34 , and the bucking flap  342  of the trigger plate  34  presses the ram head  325  of the slide shank  32  to move the slide shank  32  rearwards. The upper bolt  31  is moved rearwards and the spring B 1  is compressed, thus the door may be opened (as shown in FIG.  7 ). 
     4. When the door is opened, the lower bolt  41  is no longer subject to compression, and is pushed outwards by the restoring spring B 2  and B 3 . Meanwhile, the retaining axle  424  of the slide member  42  drops in the notch  442  of the rocker plate  44  to raise the rocker plate  44  upwards to enable the slide shank  32  to press the lower rim  362  of the cover plate  36  during returning movement so that the slide shank  32  cannot return completely (as shown in FIGS.  8  and  9 ). 
     5. When the user releases the handle and the handle returns to its original position, the linkage rod  7  and the torsional spring D 2  move the axle member  33  to its original position. Meanwhile, the trigger plate  34  is not pushed by the axle member  33  and does not press the slide shank  32 , but rather return to its original position resulting from the pressing of the slide shank  32  caused by the returning force of the spring B 1 . When the slide shank  32  is moved half way by the spring force, the rocker plate  44  is raised to stop the lower rim  362  of the cover plate  36  such that the front rim of the slide shank  32  cannot fully touch the inner side of the upper bolt opening  212 , while the upper bolt  31  and the lower bolt  41  are extended outside the upper bolt openings  212  and  212 ′ and lower bolt openings  213  and  213 ′ to form a movable condition (as shown in FIG.  9 ). 
     6. When the user closes the door, the door frame presses the upper bolt  31  and the lower bolt  41  to make them retracting. The slide member  42  of the lower bolt  41  retracts rearwards and the retaining axle  424  presses the rocker plate  44  such that the rocker plate  44  turns and escapes from the lower rim  362  of the cover plate  36 . The upper bolt  31  is pushed by the spring B 1  and extends outwards into the cavity formed in the door frame, meanwhile the slide shank  32  is no longer stopped by the rocker plate  44  and extends outwards fully. Thus an automatic locking is accomplished (as shown in FIG.  6 ). 
     7. In the event that the door is opened in a different direction and the locations of the upper bolt  31  and the lower bolt  41  should be changed, the upper bolt  31  may be moved to the direction desired and fastened by the screw A. The lower bolt  41  may be directly turned to the new direction (as shown in FIG.  10 ). 
     By means of the construction set forth above, the door may be locked automatically when closed, and the bolt may be prevented from deforming, and safe locking and longer durability of the door lock can be achieved.