Abstract:
A door lock includes a body, a locking device installed in part of the body to lock and unlock an entrance door and having a first handle provided at an inner side of the entrance door, a lock assembly engaged with the first handle when a normal key is inserted, and a locking member actuated by rotation of the first handle, a first sensing device which becomes an ON state as the locking member protrudes outside the locking device and an OFF state as the protruded locking member retreats, a speaker generating alarm when the first sensing device senses an intruder, and a power portion supplying electric power to the first sensing device and the speaker, wherein holes, through which the first handle and part of the first sensing device are exposed, are formed at an outer surface of the body, a cover is provided at a portion corresponding to the power portion, and the speaker is installed on the body so that sound is emitted out of the body.

Description:
This application claims the priority of Korean Patent Application No. 2002-26815 filed on 6 Sep. 2002 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference. 
   BACKGROUND OF THE INVENTION 
   1. Field of the Invention 
   The present invention relates to a door lock, and more particularly, to a door lock which generates alarm when an unauthorized entering happens regardless of opening of a door. 
   2. Description of the Related Art 
   A locking device consisting of a lock and a key has long been used. A locking device using a password, in which a predetermined series of numbers are set by turning a dial for unlocking, has widely been used. 
   As an unauthorized unlocking method with respect to these locking devices are becoming known, various locking devices preventing such an unauthorized unlocking has been suggested. For example, a computer key, a finger print recognizing system, and a card key have been introduced. The locking devices are not only used for a personal saving and in a variety of places such as offices and banks, but also for a locking device of an entrance door in private houses. 
   These locking devices are superior in performance because only a person who knows a password or has a card key can unlock the door. However, the locking devices are useless when an intruder breaks a door where the locking device is installed. 
   SUMMARY OF THE INVENTION 
   To solve the above and other problems, the present invention provides an alarm generating door lock which can notify existence of an intruder to the outside when an entrance door is abnormally unlocked or broken. 
   According to an aspect of the present invention, a door lock comprising: a body: a locking device installed in part of the body to lock and unlock an entrance door and having a first handle provided at an inner side of the entrance door, a lock assembly engaged with the first handle when a normal key is inserted, and a locking member actuated by rotation of the first handle; a first sensing device which becomes an ON state as the locking member protrudes outside the locking device and an OFF state as the protruded locking member retreats; a speaker generating alarm when the first sensing device senses an intruder; and a power portion supplying electric power to the first sensing device and the speaker, wherein holes, through which the first handle and part of the first sensing device are exposed, are formed at an outer surface of the body, a cover is provided at a portion corresponding to the power portion, and the speaker is installed on the body so that sound is emitted out of the body. 
   In the locking device, the locking member penetrates the body to protrude in a selected direction of three directions of the body by rotation of the first handle. 
   The first sensing device comprises a sensing portion which senses heat and an infrared ray radiated from an intruder and a movement of the intruder. 
   A remote controller having a through hole through which the locking member passes is installed at a side of the body where the locking member protrudes, the remote controller being in an ON state when the locking member passes through and remaining in the through hole and in an OFF state when the locking member does not exist in the through hole, in an opposite manner to that of the first sensing portion. 
   At least one of a second sensing device and an alarm light apparatus operated by the remote controller is provided at a place remote from the remote controller. 
   The second sensing device is provided at least one of a ceiling of the entrance door, a wall surface facing the entrance door, and a place facing a window. 
   An alarm light portion generating alarming light when the second sensing device senses an intruder is provided in the second sensing device. 
   A tact switch is provided at an inner side of the lock assembly where a key is inserted so that alarm is generated when a foreign material, not the key, is inserted and contacts the tact switch, and one of power lines connected to the tact switch is connected to the speaker via the locking device. 
   The door lock further comprises a switch turning on and off the first sensing device and provided on the first sensing device. 
   According to another aspect of the present invention, a door lock comprising: a body: a locking device installed in part of the body to lock and unlock an entrance door and having a first handle provided at an inner side of the entrance door, a lock assembly provided at an outer side of the entrance door and engaged with the first handle when a normal key is inserted, and a locking member actuated by rotation of the first handle; a remote controller which becomes an ON state as the locking member protrudes outside the locking device and an OFF state as the protruded locking member retreats; a speaker generating alarm when a foreign material, not a key, is inserted in the lock assembly; a power portion supplying electric power to the remote controller and the speaker; and a sensing device provided at a place remote from the remote controller and operated by the remote controller, wherein holes, through which the first handle and part of the first sensing device are exposed, are formed at an outer surface of the body, a cover is provided at a portion corresponding to the power portion, and the speaker is installed on the body so that sound is dissipated out of the body. 
   The door lock further comprises an alarm light apparatus provided at a place remote from the remote controller and operated by the remote controller. 
   The body further comprises a main handle used to open and shut the entrance door. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above and other features and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which: 
       FIG. 1  is a plan view illustrating a door lock having an alarm generating function according to a first preferred embodiment of the present invention; 
       FIG. 2  is a perspective view illustrating the door lock of  FIG. 1 ; 
       FIG. 3  is a perspective view illustrating the door lock of  FIG. 1  installed horizontally with respect to the door; 
       FIG. 4  is a perspective view illustrating the door lock of  FIG. 1  installed vertically with respect to the door; 
       FIG. 5  is a perspective view illustrating the door lock of  FIG. 1  installed at the lower end of the door; 
       FIG. 6  is a plan view illustrating a door lock having an alarm generating function according to a second preferred embodiment of the present invention; 
       FIG. 7  is a view showing an alarming system including the door lock of  FIG. 6  installed on an entrance door and alarm generating members separately disposed; 
       FIG. 8  is a perspective view illustrating a rear side of the entrance door where the door lock having an alarm generating function according to the first or second preferred embodiments according to the present invention is installed; and 
       FIG. 9  is a sectional view illustrating the inside of a key insertion hole of the door lock having an alarm generating function according to the first and second preferred embodiments according to the present invention. 
   

   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to  FIGS. 1 and 2 , an door lock  10  according to a first preferred embodiment of the present invention (hereinafter, referred to as the first door lock) includes a body  12  and various members installed thereon. A locking device  14  is provided at the inner left side of the body  12 . A power portion  20  where batteries  20   a  and  20   b  are installed is provided at the inner right side of the body  12 . A first sensing device  16  and an alarming unit, for example, a speaker  18 , are sequentially installed from the left side between the locking device  14  and the power portion  20 . 
   The body  12  can be configured in the following two ways. 
   First, when the first door lock  10  is installed on an entrance door  30  as shown in  FIGS. 3 through 5 , a surface on which a first handle  14   a , that is, the outside of the body  12  as shown in  FIG. 1 , is exposed may be covered by a cover (not shown). Holes for portions to be exposed, such as the first handle  14   a  and a first sensing portion  16   a , are formed in the cover. The first sensing portion  16   a  senses an infrared ray generated by an external thing, for example, an intruder. The power portion  20  has a cover (not shown) to facilitate replacement of batteries when the first door lock  10  is installed on the entrance door  30 . 
   Second, the body  12  is integrally formed except for the side which contacts the entrance door  30  unlike the body shown in  FIG. 1 . The side of the body  12  contacting the entrance door  30  is removed so that constituent elements can be installed on the body  12  through this side. Holes for portions to be exposed outwardly, including the first handle  14   a , are formed on the outer side of the body  12 . In this case, a cover to facilitate replacement of batteries after the first door lock  10  is installed on the entrance door  30  is provided to the power portion  20 . 
   In addition, a light emitting portion (not shown) is provided on a surface of the first sensing device  16  to outwardly indicate the operation of the first sensing device  16  or the consumption of power. The light emitting portion can be exposed outwardly through the cover or the outer surface of the body that is integrally formed. 
   The locking device  14  has the first handle  14   a  and a locking member  14   b . The locking member  14   b  protrudes toward a hole formed in a frame of the entrance door  30  by penetrating the body  12  from the inside of the locking device  14  to the outside, or comes back from the frame of the entrance door  30 , as the first handle  14   a  is rotated. Although two locking members are shown in the drawing, one locking member or two or more locking members can be provided. The locking member  14   b  protrudes to penetrate the body  12  in a lengthwise direction of the first door lock  10  as shown in  FIG. 1 . However, as indicated by imaginary lines in  FIGS. 1 and 2 , the locking member  14   b  may protrude toward upper or lower side of the body  12 . The direction in which the locking member  14   b  protrudes is determined considering the position of the first door lock  10  installed on the entrance door  30 . For example, as shown in  FIG. 3  or  5 , when the first door lock  10  is horizontally installed on the entrance door  30 , the locking member  14   b  protrudes in the lengthwise direction of the first door lock  10  as shown in  FIG. 1 . When the first door lock  10  is vertically installed on the entrance door  30  as shown in  FIG. 4 , the locking member  14   b  protrudes in a direction perpendicular to the lengthwise direction of the first door lock  10  as indicated by imaginary lines of  FIG. 1 . 
   As shown in  FIG. 4 , a second handle  70  may further be provided at the first door lock  10  as a main handle used to open and shut the entrance door  30 . For example, referring to  FIG. 1 , a portion where the locking device  14  of the body  12  is provided can be extended and the second handle  70  can be installed at the extended portion. The second handle  70  is installed in a horizontal direction with respect to the entrance door  30  as shown in  FIG. 4  so as to be rotated downward. The second handle  70  can be deformed in a variety of forms and can be applied in a second preferred embodiment which will be described later. In  FIG. 4 , reference numeral  100  denotes a cover used to replace the batteries of the power portion  20  of  FIG. 1 . 
   The first sensing device  16  includes a circuit board (not shown) to control a sensing operation and the first sensing portion  16   a  and is operated by being engaged with the locking device  14 . The first sensing portion  16   a  is connected by the speaker  18  through the circuit board. When the first door lock  10  is locked by rotating the first handle  14   a , the first sensing device  16  is in an “ON” state. When the first door lock  10  is unlocked as the first handle  14   a  is rotated in the opposite direction, the first sensing device  16  is in an “OFF” state. 
   The ON/OFF state of the first sensing device  16  each can be of two steps. For example, an on/off switch (not shown) is separately provided at a portion of the first sensing device  16 , for example, at the upper or lower portion of the first sensing portion  16   a . After the on/off switch is turned on, the first door lock  10  is locked by rotating the first handle  14   a  so that the first sensing device  16  is in the “ON” state. When the first handle  14   a  is rotated in the opposite direction to unlock the first door lock  10 , the on/off switch is turned off so that the first sensing device  16  is in the “OFF” state. 
   In the operation of the first door lock  10 , when the first door lock  10  is installed at the entrance door  30  or  32  as shown in  FIGS. 3 through 5 , and an intruder removes the locking state in an abnormal manner or breaks the entrance door  30  or  32  itself, since the first door lock  10  is still in the “ON” state although the entrance door  30  or  32  is entirely broken in the latter case, the first sensing device  16  is in the “ON” state. Accordingly, an infrared ray radiated from the intruder is received by the first sensing portion  16   a  of the first sensing device  16 . The first sensing device  16  senses the infrared ray and outputs alarm via the speaker  18 . 
   Referring to  FIG. 6 , an door lock  40  according to a second preferred embodiment of the present invention (hereinafter, referred to as the second door lock) includes the first door lock  10  and a remote control member  34  attached to the first door lock  10  (hereinafter, referred to as the remote controller). The remote controller  34  is operated according to the operation of the locking device  14 , that is, protrusion of the locking member  14   b . For example, when the locking member  14   b  protrudes to penetrate first and second through holes h 1  and h 2  and is kept therein, the remote controller  34  is in the “ON” state. When the locking member  14   b  comes back to the inside of the locking device  14  so as not to be present in the first and second through holes h 1  and h 2 , the remote controller  34  is in the OFF state. The remote controller  34  controls the operation of a device installed at a place remote from the second door lock  40 . 
   For example, as shown in  FIG. 7 , in the state in which the second door lock  40  is installed on an entrance door  36 , the remote controller  34  controls the operation of a second sensing device  50  having the same function as that of the first sensing device  16  and/or an alarm light apparatus  60  to notify the presence of an intruder, which are located at a place remote from the entrance door  36 . The second sensing device  50  includes a second sensing portion  50   a  receiving an infrared ray radiated from an intruder and an alarm generating portion  50   b  to notify the sense of an intruder. The second sensing device  50  may be installed at a ceiling near the entrance door, a wall facing the entrance door, or a portion facing a window. The alarm light apparatus  60  can be provided in an inner room which can be easily viewed from the outside through a window or at the outer portion of the window. By providing the second sensing device  50  and/or the alarm light apparatus  60 , an alarm system is established. An alarm light portion having the same function as that of the alarm light apparatus  60  can be provided at the second sensing device  50 . 
   Since the second sensing device  50  or an equivalent sensing apparatus is provided at a ceiling near the entrance door or a place facing the entrance door or a window, when an intruder is not sensed or the intruder intrudes through the window while the intruder unlocks the entrance door in an abnormal manner or completely breaks the entrance door itself, the intrusion of the intruder can be notified. 
   As shown in  FIG. 6 , the remote controller  34  is installed at a portion where the locking member  14   b  of the first door lock  10  protrudes. However, the remote controller  34  can be provided at the place where the first sensing device  16  of  FIG. 1  is installed. 
   In the former case, the second sensing device  50  and/or the alarm light apparatus  60  are used together with the first sensing device  16 . In the latter case, the second sensing device  50  and/or the alarm light apparatus  60  are used alone. Also, in the former case, a process in which the remote controller  34  is turned on/off is the opposite to a process in which the first sensing device  16  is turned on/off. 
   In the case of the first sensing device  16 , the “ON” state occurs when the locking member  14   b  protrudes so that the locking member  14   b  does not exist in the locking device  14 . In contrast, in the case of the remote controller  34 , the “ON” state occurs when the locking member  14   b  exists in the locking device  14 . The “OFF” state occurs in the reverse case. 
     FIG. 8  shows the outer side of the entrance door  30  where the first or second door locks  10  or  40  is installed. 
   Referring to  FIG. 8 , the second handle  70  which is used by a user to open the entrance door  30  is provided and a lock assembly  72  having an insertion hole  72   a  in which a key is inserted is provided above the second handle  70 . When a normal key is inserted in the insertion hole  72   a , the lock assembly is engaged with the first handle  14   a  of the first or second door lock  10  or  40 . 
     FIG. 9  shows the structure of the lock assembly  72 . Referring to  FIG. 9 , insertion hole  72   a  is formed inside the lock assembly  72  to a predetermined depth. A tact switch  74  is provided at the innermost side of the insertion hole  72   a . When an abnormal key, that is a foreign material such as a chopstick or an iron stick, is inserted and contacts the tact switch  74 , alarm is generated. 
   The tact switch  74  is connected to the speaker  18  through the circuit board of the first sensing device  16 . Reference numeral  74   a  denotes a button provided on the tact switch  74  and contacting the foreign material. First and second power supply likes  76   a  and  76   b  are connected to the tact switch  74 . Power is supplied to the tact switch  74  through the first and second power supply lines  76   a  and  76   b.  When the button  74   a  is pressed, current flows via the tact switch  74  to generate an alarm. To the contrary, when the button  74   a  is not pressed, the current flowing via the tact switch  74  may be cut off. 
   One of the first and second power supply lines  76   a  and  76   b  is connected by a fine switch (not shown) provided on the locking device  14  of the first and/or second door locks  10  and  40 . Accordingly, when an intruder unlocks the door lock using a foreign material, the tact switch  74  functions as a hindrance to the intrusion. When the intruder breaks the entrance door itself, the first and/or second sensing devices  16  and  50  function as a hindrance to the intrusion. Thus, intrusion cannot succeed without being sensed. 
   As described above, the door lock according to the present invention includes an integrated sensing apparatus which can sense heat, an infrared ray, or movement generated from an intruder. An equivalent sensing apparatus is provided at a ceiling near an entrance door or a place facing the entrance door or a window. Thus, when an intruder unlocks the locking device by using a foreign material or breaks the entrance door itself, the intrusion is immediately notified through alarm so that the intrusion is prevented or made difficult. 
   While this invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.