Patent Publication Number: US-6698263-B2

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 able to lock a door by the valve rod of an electromagnetic valve controlled by a remote controller, with the door lock impossible to be unlocked only by a key before the valve rod of the electromagnetic valve is released by a remote controller to disengage from the insert hole of the bolt base of a door jamb, having best effect of anti-theft. 
     2. Description of the Prior Art 
     A conventional door lock as shown in FIG. 1, includes a housing  10 , a lock base  11 , a pull plate  12  and a deadbolt  13 . 
     The lock base  11  is secured in the interior of the housing  10 , having lateral lock rods  110  fitted at one side. The lock rods  110  of the lock base  11  are able to extend out of the through holes  100  in a side wall of the housing  10  and engage into an elongate slot  141  in a side wall of the bolt base  140  of a door jamb  14 . The lock base  11  has its inner and outer side respectively provided with a lock core  111  having a keyhole  112 . 
     The pull plate  12  has its fixing plate  120  inserted in the slide hole  101  of the housing  10  and combined with the fixing plate  102  of the housing  10 . The deadbolt  13  is horizontally fitted inside the housing  10 , having one end inserted through the fixing plate  102  of the housing  10  and secured with the fixing plate  120  of the pull plate  12 . The deadbolt  13  has one end fitted with a spring  130  and the other end provided with a block  131  protruding out of the through hole  103  in the side wall of the housing  10  to be engaged in an elongate slot  141  in a side wall of the bolt base  140  on the doorjamb  14 . 
     Thus, when a key is inserted in the keyhole  112  of the lock core  111  and turned around, the lock rods  110  and the block  131  will be moved back and disengaged from the elongate slot  141  of the bolt base  140  on the doorjamb  14 , thus finishing unlocking of the door lock. 
     However, a conventional door lock has its lock rods  110  and block  131  locked in the bolt base  140  of the door jamb  14  only by a key so it is easy to be unlocked with some unlocking tools, thus having no effect of anti-theft. 
     SUMMARY OF THE INVENTION 
     The objective of the invention is devised to offer a remote-controlled door lock having best effect of anti-theft. 
     The feature of the invention is that the housing is installed inside with a battery base, a circuit board and an electromagnetic valve. The electromagnetic valve has a lateral valve rod able to extend out of the through hole in a sidewall of the housing and engage in the insert hole in a sidewall of the bolt base of a doorjamb. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     This invention will be better understood by referring to the accompanying drawings, wherein: 
     FIG. 1 is a cross-sectional view of a conventional door lock; 
     FIG. 2 is an exploded perspective view of a door lock in the present invention; 
     FIG. 3 is a perspective view of the door lock installed in a housing in the present invention; 
     FIG. 4 is a perspective view of the door lock having a control box fixed on the housing in the present invention; 
     FIG. 5 is a perspective view of the door lock having the control box secured under the bottom of the housing in the present invention; and, 
     FIG. 6 is a perspective view of the door lock installed in the bolt base of a doorjamb in the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     A preferred embodiment of a remote-controlled door lock in the present invention, as shown in FIGS. 2 and 3, includes a housing  2 , a battery base  3 , a circuit board  4  and an electromagnetic valve  5  as main components combined together. 
     The housing  2  is installed inside with a lock base  20  having lock rods  21  able to extend out of the through holes in a side wall of the housing  2 . A deadbolt  22  is horizontally fitted in the housing  2 , having one end fixed with a block  23  protruding out of the sidewall of the housing  2 . The housing  2  has an opening  24  closed by a cover  25 . 
     The battery base  3 , the circuit board  4  and the electromagnetic valve  5  are installed in the interior of the housing  2 . The battery base  3  has batteries  30  fitted therein and the electromagnetic valve  5  is fitted with a lateral valve rod  50  able to extend out of the through hole  26  in a side wall of the housing  2 . Besides, an elongate slot  61  and an insert hole  62  are respectively bored in a sidewall of the bolt base  60  of a door jamb  6 , with the elongate slot  61  aligned to the block  23  and the lock rods  21  in the side wall of the housing  2 , and the insert hole  62  exactly facing the valve rod  50  of the electromagnetic valve  5 . 
     To lock the door lock, a remote controller is operated to give out a locking signal to the circuit board  4  to start the valve rod  50  of the electromagnetic valve  5  to move outward and extend out of the through hole  26  of the housing  2  and engage in the insert hole  62  of the bolt base  60  of the door jamb  6  to lock a door at a limited position. Under this condition, the door lock is impossible to be unlocked only by a key before the valve rod  50  of the electromagnetic valve  5  is released by a remote controller and disengaged from the insert hole  62  of the bolt base  60 . 
     On the contrary, to unlock the door lock, simply operate a remote-controller to give out an unlocking signal to the circuit board  4  to trigger the valve rod  50  of the electromagnetic valve  5  to move backward and disengage from the insert hole  62  of the bolt base  60 , and at this time the door lock can be unlocked by a key. 
     Besides, the battery base  3 , the circuit board  4  and the electromagnetic valve  5  originally provided inside the housing  2  can be installed in a control box  7 . The control box  7  provided inside with the battery base  3 , the circuit board and the electromagnetic valve  5  is fixedly positioned on or under the housing  2 , as shown in FIGS. 4 and 5. The valve rod  50  of the electromagnetic valve  5  can move outward and extend out of the through hole  70  in a side wall of the control box  7 , aligned to the insert hole  62  in a side wall of the bolt base  60  on a door jamb  6 . To lock the door lock, as described above, only operate a remote controller to give out a locking signal to the circuit board  4  to start the valve rod  50  of the electromagnetic valve  5  to move outward and extend out of the through hole  70  of the control box  7  and engage in the insert hole  62  of the bolt base  60  of the door jamb  6 , thus finishing locking of a door lock. 
     Further, the battery base  3 , the circuit board  4  and the electromagnetic valve  4  can be installed in the bolt base  60  of the doorjamb  6 , as shown in FIG.  6 . The bolt base  60  has a side wall bored with an elongate slot  61  and a through hole  63 , with the valve rod  50  of the electromagnetic valve  5  able to extend out of the through hole  63  of the bolt base  60 . Then, the housing  2  has one sidewall bored with an insert hole  27  exactly facing the valve rod  50  in the sidewall of the bolt base  60 . 
     To lock the door lock, a remote controller is operated to give out a locking signal to the circuit board  4  to trigger the valve rod  50  of the electromagnetic valve  5  to move outward and extend out of the through hole  63  of the bolt base  60  and engage into the insert hole  27  of the housing  2  to lock a door at a limited position. Thus, the door lock is impossible to be unlocked only by a key before the valve rod  50  of the electromagnetic valve  5  is released by a remote controller to disengage from the insert hole  27  of the housing  2 , having best effect of anti-theft. 
     To unlock the door lock, just operate the remote controller to give out unlocking signal to the circuit board  4 , which synchronously starts the valve rod  50  to move inward and disengage from the insert hole  27  of the housing  2 , and subsequently the door lock is unlocked by a key. 
     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.