Abstract:
A lock core with an alarm includes a shell, an inner rotary member, a plurality of locking pin units, an alarm-actuating unit and an alarm-stopping unit. In using, a correct key is inserted in the inner rotary member so the surface of the key can trigger the alarm-actuating unit to let the alarm in a lock sound out. Rotation of the key for a certain angle can rotate the inner rotary member to unlock the lock and also stop the alarm. In case a wrong key is used by a thief to insert in the key hole but impossible to rotate the inner rotary member to unlock the lock, then the alarm will sound out after the preset time (3-5 seconds) in subsequence of insertion of the wrong key, frightening a would-be thief.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     This invention relates to a lock core with an alarm, particularly to one provided with an alarm actuating unit to be pushed up by a correct key inserted in a key hole of an inner rotary body in a shell of the lock core to start an alarm provided in the lock, and an alarm stopping unit to be actuated by the key rotated in the key hole to unlock a deadbolt and also toughing an alarm stopping switch to stop the alarm and to unlock the lock at the same time. Should a would-be thief insert a wrong key in the key hole for attempting to pry open the lock, the alarm will be started to sound out after a set time (3-5 seconds) in sequence of insertion of the wrong key to frighten the thief to run away, so the lock with this lock core with an alarm is extraordinarily effective in anti-theft.  
         [0003]     2. Description of the Prior Art  
         [0004]     Generally, a common lock has a core structure designed with an objective to make it complicated enough for not to be pried open illegally and easily. But it can only delay the time of being pried open by a thief, not impossible to prevent anti-theft completely.  
       SUMMARY OF THE INVENTION  
       [0005]     The objective of the present invention is to offer a lock core with an alarm to freak out any one who attempts to pry open the lock with this lock core by sounding an alarm if a wrong key is inserted in the keyhole of the lock, but impossible to be rotated to unlock the deadbolt of the lock.  
         [0006]     The feature of the invention is a shell, an inner rotary member, a plurality of locking pin units, an alarm actuating unit, and an alarm-stopping unit. The shell has a chamber and a plurality of transverse holes. The inner rotary member is positioned in a chamber of the shell, having a keyhole and a plurality of transverse holes communicating with the transverse holes and corresponding to the transverse holes of the shell. The inner rotary member further has a projecting member extending rearward and having an annular groove and a recess on its outer surface. The locking pin units are movably received respectively in the transverse holes of the shell and of the inner rotary member. The alarm-actuating unit is positioned in a foremost transverse hole of the shell and of the inner rotary member, consisting of a long pin, a short pin, a spring, an insulating base and a trigger switch. The alarm-stopping unit is positioned in the rearmost hole of the shell and the recess of the inner rotary member, consisting of a pin, a spring, an insulating base and a stopping switch. 
     
    
     BRIEF DESCRIPTION OF DRAWINGS  
       [0007]     This invention will be better understood by referring to the accompanying drawings, wherein:  
         [0008]      FIG. 1  is an exploded perspective view of a lock core in the present invention;  
         [0009]      FIG. 2  is a perspective view of the lock core in the present invention;  
         [0010]      FIG. 3  is a cross-sectional view of the lock core in the present invention, showing it under locked condition;  
         [0011]      FIG. 4  is a cross-sectional view of the lock core in the present invention, with a correct key inserted in the lock core; and,  
         [0012]      FIG. 5  is a cross-sectional view of the lock core in the present invention, showing it in the unlocked condition with the correct key inserted and rotated for a certain angle. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0013]     A preferred embodiment of a lock core with an alarm in the present invention, as shown in  FIGS. 1, 2  and  3 , includes a shell  1 , an inner rotary member  2 , a plurality of locking pin units  3 , an alarm-actuating unit  4 , an alarm-stopping unit  5 , and a key  6  as main components.  
         [0014]     The shell  1  is provided with a chamber  10  formed in the center, a plurality of transverse holes  11  spaced apart in a straight line in the wall of the shell  1  and communicating with the chamber  10 , two grooves  12  and  13  respectively formed in an upper end of the foremost one and the rearmost one of the transverse holes  11 .  
         [0015]     The inner rotary member  2  is received in the chamber  10 , having a key hole  20  and a plurality of transverse holes  21  spaced apart in a straight line in its wall and communicating with the key hole  20  and also corresponding to the transverse holes  11  of the shell, a projecting member  22  extending rearward and having an annular groove  23  and a recess  24  formed in an outer surface, and a hook ring  25  engaging on the annular groove  23 .  
         [0016]     The plurality of locking pin units  3  to be received respectively in the holes  11  and  21  of the shell  1  and the inner rotary member  2  consist respectively of a long pin  30 , a short pin  31 , a spring  32  and a stopper  33  orderly arranged.  
         [0017]     The alarm actuating unit  4  to be received in the foremost hole  11  and  21  of the shell and the inner rotary member  2  consists of a long pin  40 , a short pin  41 , a spring  42 , an insulating base  43  and a trigger switch  44  orderly arranged. The short pin  41  has a stud  410  on an upper end, and the insulating base  43  has a cell  430  opening upward and a hole  431  in its bottom, and the alarm actuating switch  44  provided with a conductive member  440  to be connected with an alarm provided in the lock.  
         [0018]     The alarm stopping unit  5  is to be received in the rearmost hole  11  of the shell  1  and in the recess  24  of the rotary member  2 , consisting of a pin  51 , a spring  52 , an insulating base  53  and a stopping switch  54 . The pin  51  has a stud  510  on its upper end, the insulating base  53  has a cell  530  opening upward and a hole  531  in its bottom, and the stopping switch  54  has a conductive member  540  to be connected with the alarm in the lock.  
         [0019]     The key  6  is to be inserted in the keyhole  20  for unlocking the lock and stopping the alarm at the same time, having a plurality of recesses  60  of mutually different depths spaced apart on a surface of the key  6 .  
         [0020]     In assembling, referring to  FIGS. 1, 2  and  3 , firstly, the inner rotary member  2  is placed stably in the chamber  10  of the shell  1 , with the projecting member  22  extending in the rear portion of the shell  1 , and with the hook ring  25  engaging on the annular groove  23  of the projecting member  22 . Then the transverse holes  21  and the recess  24  of the inner rotary member  2  are automatically aligned to the transverse holes  11  of the shell  1 , and then the long pins  30 , the short pins  31 , the springs  32  are orderly inserted in the holes  11  and  21  of the shell  1  and the inner rotary member  2 , with the stoppers  33  fixed in the upper ends of the transverse holes  11  of the shell  1 , positioning stably the locking pins units  3  in the shell  1  and the inner rotary member  2 . Next, the long pin  40 , the short pin  41  and the spring  42  of the alarm actuating member  4  are orderly placed in the foremost hole  11  of the shell  1  and the foremost hole  21  of the inner rotary member  2 , with the insulating base  43  and the trigger switch  44  are orderly placed in the groove  12  on the foremost transverse holes  11  and  21  of the shell  1  and the inner rotary member  2 . Further, the pin  51 , the spring  52  of the alarm stopping unit  5  are orderly placed in the rearmost hole  11  of the shell  1 , with the pin  51  having its bottom located in the recess  24  of the inner rotary member  2 , and with the insulating base  53  and the stopping switch  54  located in the groove  13  on the rearmost hole  11  of the shell  1 . The key  6  is to be inserted in the keyhole  20  of the inner rotary member  2  for unlocking the lock and also stopping the alarm. Thus the lock core of the present invention is finished in assembly.  
         [0021]     In using, as shown in  FIG. 3 , when the key  6  is not yet inserted in the key hole  20 , the locking pin units  3 , the alarm actuating unit  4  and the alarm stopping unit  5  have the long pins  30  and  40 , the short pins  31  and  41  and the pin  51  are elastically maintained by the springs  32 ,  42  and  52 . Meanwhile, the long pins  30  and  40  of the locking pin units  3  and the alarm actuating unit  4  all have their lower ends extending in the key hole  20  of the inner rotary member  2 , and the short pins  31  and  41  of the locking pin units  3  and the alarm actuating unit  4  are located partly both in the shell  1  and the inner rotary member  2 , keeping the inner rotary member  2  from rotated. In case that the lock with this lock core is to be unlocked, the key  6  is inserted in the key hole  20  of the inner rotary member  2  as shown in  FIG. 4 , letting the surface of the key  6  facing and pushing up the bottoms of the long pins  40  and  30  and the short pins  41  and  31  of the alarm actuating unit  4  and the locking pin units  3 , compressing the springs  42  and  32 , moving the short pins  41  and  31  completely into the holes  11  of the shell  1 . Then the connecting surfaces of the long pins  30  and  40  and the short pins  31  and  41  are aligned with the connecting surfaces of the shell  1  and the inner rotary member  2 , permitting the inner rotary member  2  rotate, with the pin  41  of the alarm actuating unit  4  pushed up. Then the stud  410  of the pin  41  extends in the hole  431  of the insulating base  43  to touch the trigger switch  44  to electrify the alarm in the lock, which then sounds out. If the user then rotates the key  6  to make the inner rotary member  2  rotate for a certain angle, as shown in  FIG. 5 , the outer surface of the projecting member  22  of the inner rotary member  2  pushes up the pin  51  of the alarm stopping unit  5 , compressing the spring  52 , pushing up the pin  51  with the stud  510  extending through the hole  531  of the insulating base  53  to touch the stopping switch  54  to turn off the alarm immediately. In this way, the lock is also unlocked at the same time. The alarm is set to sound out in case stopping action is not carried out within 3 to 5 seconds.  
         [0022]     Therefore, if a thief tries to pry open the lock with the lock core of the present invention by inserting a wrong key or any tool in the key hole  20  of the inner rotary member  2 , the surface of the wrong key or some tool may push up the long pin  40  of the alarm actuating unit  4 , and then the short pin  41  to move up the stud  410  of the short pin  41 , which then extends up to touch the trigger switch  44  to turn on the alarm in the preset time limit. Thus if he thief could not rotate the wrong key or the like to rotate the inner rotary member  2  within the preset time limit, then the alarm will sound out to frighten the thief without fail. Then other persons near the lock may pay attention to the sound to look around to know what is the matter. Thus the thief may run away from the lock quickly, very afraid to keep on prying open the lock.  
         [0023]     While the embodiment of the invention has been described above, it will be recognized and understood that various modifications may be made therein and the appended claims are intended to cover all such modifications that may fall within the spirit and scope of the invention.