Patent Publication Number: US-6658905-B1

Title: Remote-controlled door lock

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a remote-controlled door lock, particularly to one provided with a bolt-locking device capable of being controlled by a remote controller to extend a bolt rod of the bolt-locking device to be inserted into and engaged with an engagement hole of a strike base installed in a doorframe, thereby locking a doorplate in a limited position. When the door plate is locked with the bolt rod of the bolt-locking device still engaged with the engagement hole of the strike base, the door plate is unable to be completely unlocked only by a key without using the remote controller to actuate the bolt rod of the bolt-locking device to be disengaged from the engagement hole of the strike base, thus achieving a best effect of anti-theft. 
     2. Description of the Prior Art 
     A conventional key-operated door lock, as shown in FIG. 1, includes a case body  10  provided with a lock base  11 , a pull plate  12  and a latch-bolt assembly  13  disposed therein. The lock base  11  has deadbolts  110  provided at one side thereof and capable of extending out of through holes  100  formed in a sidewall of the case body  10  to be inserted into and engaged with an elongated opening  141  formed in sidewall of a strike base  140  installed in a door frame  14 . The lock base  11  further has two lock cores  111  respectively disposed in an inner and an outer sides thereof and each provided with a keyhole  112 . The pull plate  12  is disposed in the inner side of the case body  10  and has a fixing plate  120  extending into a slide groove  101  of the case body  10  and attached relatively to a fixing plate  102  of the case body  10 . One end of the latch-bolt assembly  13  extends through the fixing plate  102  of the case body  10  to be secured to the fixing plate  120  of the pull plate  12 . A spring  130  is sleeved on the latch-bolt assembly  13  adjacent to the end thereof. The other end of the latch-bolt assembly  13  is provided with a stop member  131  capable of extending out of a through hole  103  formed in a sidewall of the case body  10  to be inserted into and engaged with the elongated opening  141  of the strike base  140 . When a key is inserted in the keyhole  112  of one of the lock cores  111  to turn, the deadbolts  110  and the stop member  131  can be disengaged from the elongated opening  141  of the strike base  140 , thus unlocking the conventional key-operated door lock. 
     However, such a conventional key-operated door lock only using a key to force the deadbolts  110  to be engaged with the elongated opening  141  the strike base  140  can be easily pried unlocked by thefts with simple picking tools or special tools, thus losing the anti-theft function. 
     SUMMARY OF THE INVENTION 
     The main purpose of the invention is to offer a remote-controlled door lock having a best effect of anti-theft. 
     The main feature of the invention is to provide a case body having a battery base, a circuit board and a bolt-locking device disposed therein, the bolt-locking device having a motor, a driving gear disposed at an upper end of the motor, a driven gear meshed with the driving gear, a transmission gear coaxially disposed below the driven gear, a gear rack meshed with the transmission gear, and a bolt rod disposed at a front portion of the gear rack and capable of extending out of a through hole formed in a sidewall of the case body; and, a strike base installed in a doorframe having an engagement hole formed in a sidewall thereof for corresponding in location to be aligned with the bolt rod of the bolt-locking device. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
     FIG. 1 is a schematic sectional view of a conventional door lock; 
     FIG. 2 is a perspective view of a remote-controlled door lock in the present invention, showing a battery base, a circuit board and a bolt-locking device disposed in a case body; 
     FIG. 3 is a perspective view of the remote-controlled door lock in the present invention, showing the battery base, the circuit board and the bolt-locking device disposed in a control case secured above the case body; 
     FIG. 4 is a perspective view of the remote-controlled door lock in the present invention, showing the battery base, the circuit board and the bolt-locking device disposed in the control case secured below the case body; and, 
     FIG. 5 is a perspective view of the remote-controlled door lock in the present invention, showing the battery base, the circuit board and the bolt-locking device disposed in a strike base installed in a doorframe. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of a remote-controlled door lock in the present invention, as shown in FIG. 2, mainly includes a case body  2  and a strike base  60 . 
     The case body  2  has a lock base  20  and a latch-bolt assembly  22  disposed therein. The lock base  20  has dead bolts  21  capable of extending out of a sidewall of the case body  2 . The latch-bolt assembly  22  has an engagement block  23  disposed at one end thereof and capable of extending out of the sidewall of the case body  2 . 
     The case body  2  further has a battery base  3 , a circuit board  4  and a bolt-locking device  5  disposed therein. The battery base  3  can accommodate batteries  30  therein. The bolt-locking device  5  has a motor  50 , a driving gear  51  disposed at an upper end of the motor  50 , a driven gear  52  meshed with the driving gear  51 , a transmission gear  53  coaxially disposed below the driven gear  52 , a gear rack  54  meshed with the transmission gear  53 , and a bolt rod  55  disposed at a front portion of the gear rack  54  and capable of extending out of a through hole  24  formed in the sidewall of the case body  2 . 
     The strike base  60  installed in a doorframe  6  has an elongated opening  61  and an engagement hole  62  respectively formed in a sidewall thereof. The elongated opening  61  is disposed for corresponding in location to be aligned with the dead bolts  21  of the lock base  20  and the engagement block  23  of the latch-bolt assembly  22 . The engagement hole  62  is disposed for corresponding in location to be aligned with the bolt rod  55  of the bolt-locking device  5 . 
     In locking, when the circuit board  4  receives a locking sign from a remote controller (not shown), the circuit board  4  will actuate the motor  50  of the bolt-locking device  5  to turn counterclockwise to make the driving gear  51  to rotate the driven gear  52  clockwise so that the transmission gear  53  coaxially rotated with the driven gear  52  in the same direction will force the gear rack  54  to move outwardly to make the bolt rod  55  of the bolt-locking device  5  extending out of the through hole  24  of the case body  2  to be inserted into and engaged with the engagement hole  62  of the strike base  60  so as to have a door plate (not shown) locked in a limited position, by which when the door plate is locked with the bolt rod  55  of the bolt-locking device  5  still engaged with the engagement hole  62  of the strike base  60 , the door plate is unable to be completely unlocked only by a key (not shown) to unlock the dead bolts  21  of the lock base  20  and the engagement block  23  of the latch-bolt assembly  22  without using the remote controller to actuate the bolt rod  55  of the bolt-locking device  5  to be disengaged from the engagement hole  62  of the strike base  60 , thus achieving a best effect of anti-theft. 
     In unlocking, when the circuit board  4  receives an unlocking sign from the remote controller, the circuit board  4  will actuate the motor  50  to turn clockwise to make the driving gear  51  to rotate the driven gear  52  counterclockwise so that the transmission gear  53  coaxially rotated with the driven gear  52  in the same direction will force the gear rack  54  to move inwardly to make the bolt rod  55  of the bolt-locking device  5  disengaged from the engagement hole  62  of the strike base  60  and moving back into the case body  2 , by which the door plate can be completely unlocked after using the key to unlock the dead bolts  21  of the lock base  20  and the engagement block  23  of the latch-bolt assembly  22 . 
     Besides, the battery base  3 , the circuit board  4  and the bolt-locking device  5  of the case body  2  can be disposed in a control case  7 . The control case  7  can be firmly secured above the case body  2  (as shown in FIG. 3) or below the case body  2  (as shown in FIG.  4 ). The bolt rod  55  of the bolt-locking device  5  disposed in the case control  7  is capable of extending out of a through hole  70  formed in a sidewall of the case control  7 . The engagement hole  62  formed in the sidewall of the strike base  60  is disposed for corresponding in location to be aligned with the bolt rod  55  of the bolt-locking device  5 . When the circuit board  4  receives a locking sign from the remote controller, the circuit board  4  will actuate the motor  50  to turn the driving gear  51  to rotate the driven gear  52  so that the transmission gear  53  coaxially rotated with the driven gear  52  in the same direction will force the gear rack  54  to move outwardly to make the bolt rod  55  of the bolt-locking device  5  extending out of the through hole  70  of the control case  7  to be inserted into and engaged with the engagement hole  62  of the strike base  60 , by which the door plate is locked in a limited position. 
     Moreover, the battery base  3 , the circuit board  4  and the bolt-locking device  5  of the case body  2  can be disposed in the strike base  60  of the doorframe  6  (as shown in FIG.  5 ). The bolt rod  55  of the bolt-locking device  5  disposed in the strike base  60  is capable of extending out of a through hole  63  formed in a sidewall of the strike base  60 . An engagement hole  25  is formed in the sidewall of the case body  2  for corresponding in location to be aligned with the bolt rod  55  of the bolt-lockingdevice  5 . 
     In locking, when the circuit board  4  receives a locking sign from the remote controller, the circuit board  4  will actuate the motor  50  to turn clockwise to make the driving gear  51  to rotate the driven gear  52  counterclockwise so that the transmission gear  53  coaxially rotated with the driven gear  52  in the same direction will force the gear rack  54  to move outwardly to make the bolt rod  55  of the bolt-locking device  5  extending out of the through hole  63  of the strike base  60  to be inserted into and engaged with the engagement hole  25  of the case body  2  so as to have the door plate locked in a limited position, by which when the door plate is locked with the bolt rod  55  of the bolt-locking device  5  still engaged with the engagement hole  25  of the case body  2 , the door plate is unable to be completely unlocked only by the key to unlock the dead bolts  21  of the lock base  20  and the engagement block  23  of the latch-bolt assembly  22  without using the remote controller to actuate the bolt rod  55  of the bolt-locking device  5  to be disengaged from the engagement hole  25  of the case body  2 , thus achieving a best effect of anti-theft. 
     In unlocking, when the circuit board  4  receives an unlocking sign from the remote controller, the circuit board  4  will actuate the motor  50  to turn counterclockwise to make the driving gear  51  to rotate the driven gear  52  clockwise so that the transmission gear  53  coaxially rotated with the driven gear  52  in the same direction will force the gear rack  54  to move inwardly to make the bolt rod  55  of the bolt-locking device  5  disengaged from the engagement hole  25  of the case body  2  and moving back into the strike base  60 , by which the door plate can be completely unlocked after using the key to unlock the dead bolts  21  of the lock base  20  and the engagement block  23  of the latch bolt assembly  22 . 
     While the preferred 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.