Patent Publication Number: US-9416567-B2

Title: Two-way releasable mortise structure

Description:
CROSS REFERENCES 
     Applicant claims foreign priority under Paris Convention to Korean Patent Application No. 10-2012-000041721, filed 20 Apr. 2012, with the Korean Intellectual Property Office, where the entire contents are incorporated herein by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a two-way releasable mortise structure, and more particularly, to a two-way releasable mortise structure which can unlock a door lock even though actuation blocks for releasing a dead bolt and a latch bolt by receiving a rotary force by an indoor lever and an outdoor lever are rotated in an arbitrary direction. 
     2. Background of the Invention 
     A door lock is a device that is mounted on a door in order to lock and unlock the door according to whether a latch bolt and a dead bolt, which go in and out at the side of the door, are extended or retracted. The latch bolt is means for preventing an automatic opening of the door and is not locking means. Therefore, in order to solve the problem of the unsafe latch bolt, a mortise lock structure using the latch bolt and the dead bolt has been widely used. 
     A digital door lock can unlock the dead bolt by a driving force of a motor, and hence, such a digital door lock is very convenient because it can automatically move the dead bolt to a locked position through the driving force of the motor after the door is closed even though a user forgets door locking. 
     In the meantime, in the case that the user has to rapidly escape to the outside in emergency circumstances such as fires, because an action to unlock the dead bolt hinders the user from opening the door and escaping to the outside, a digital door lock with a panic structure that the latch bolt and the dead bolt are opened simultaneously just by manipulation of an indoor lever. 
     However, conventional digital door locks as well as Korean Utility Model Application No. 20-2011-6836 which is devised by the applicant of the present invention have an disadvantage in that an outdoor lever or an indoor lever must be changed in direction according to whether the door is a right handed door or a left handed door because the latch bolt and the dead bolt can be unlocked when actuating means for retracting the latch bolt and the dead bolt must be rotated in only one direction. Alternatively, push-and-pull open type door locks have an inconvenience in that rotary force converting means must be additionally mounted. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior arts, and it is an object of the present invention to provide an improved two-way releasable mortise structure, which can unlock a latch bolt and a dead bolt by finally converting a rotary force of actuating means into an one-way rotary force even though the actuating means is rotated in an arbitrary direction. 
     To achieve the above objects, the present invention provides a two-way releasable mortise structure including: a latch bolt extended through a hole of a door frame to keep a closed state of a door; a latch actuation block rotatably actuated to tow the latch bolt so as to unlock the latch bolt; a latch actuation block operating part rotated by outdoor actuating means so as to rotate the latch actuation block; and a rotary force conversion member moving in interlock with the latch actuation block operating part and having an inclined plane in contact with the latch actuation block, wherein the latch actuation block operating part and the latch actuation block are independently rotated within a predetermined angle range, the latch actuation block operating part has a pressurizing portion and the latch actuation block has a pressure receiving portion which receives pressure by the pressurizing portion, so that the pressurizing portion pushes the pressure receiving portion and the latch actuation block operating part and the latch actuation block are integrally rotated in one direction when the latch actuation block operating part is rotated in one direction, and when the latch actuation block operating part is rotated in the opposite direction, the inclined plane pushes one side of the latch actuation block while the rotary force conversion member in interlock with the latch actuation block operating part moves, so as to rotate the latch actuation block in one direction. 
     In order to achieve the above object, the two-way releasable mortise structure further includes a latch link adapted to receive the rotary force from the latch actuation block to tow the latch bolt to one side. 
     Moreover, the latch actuation block is in a ring shape having a cut portion at one side and has end portions formed at both sides of the cut portion, and the pressure receiving portion of the latch actuation block is formed at one of the both end portions of the cut portion. 
     Furthermore, the latch actuation block operating part and the rotary force conversion member respectively have gear teeth which are in gear-engagement with each other. 
     Additionally, the latch actuation block has a latch retaining wing for towing the latch bolt and the inclined plane of the rotary force conversion member pushes the bottom of the latch retaining wing so as to rotate the latch actuation block. 
     In another aspect of the present invention, the present invention provides a two-way releasable mortise structure including: a dead bolt extended through a hole of a door frame to keep a closed state of a door; a simultaneously releasable actuation block rotatably actuated to tow the dead bolt so as to unlock the dead bolt; a simultaneously releasable actuation block operating part rotated by indoor actuating means so as to rotate the simultaneously releasable actuation block; and a rotary force conversion member moving in interlock with the simultaneously releasable actuation block operating part and having an inclined plane in contact with the simultaneously releasable actuation block, wherein the simultaneously releasable actuation block operating part and the simultaneously releasable actuation block are independently rotated within a predetermined angle range, the simultaneously releasable actuation block operating part has a pressurizing portion and the simultaneously releasable actuation block has a pressure receiving portion which receives pressure by the pressurizing portion, so that the pressurizing portion pushes the pressure receiving portion and the simultaneously releasable actuation block operating part and the simultaneously releasable actuation block are integrally rotated in one direction when the simultaneously releasable actuation block operating part is rotated in one direction, and when the simultaneously releasable actuation block operating part is rotated in the opposite direction, the inclined plane pushes one side of the simultaneously releasable actuation block while the rotary force conversion member in interlock with the simultaneously releasable actuation block operating part moves, so as to rotate the simultaneously releasable actuation block in one direction. 
     In order to achieve the above object, the simultaneously releasable actuation block tows the dead bolt by the dead bolt retaining wing for towing the dead bolt, and further has a latch bolt retaining wing for towing the latch bolt. 
     Moreover, the simultaneously releasable actuation block is in a ring shape having a cut portion at one side and has end portions formed at both sides of the cut portion, and the pressure receiving portion of the simultaneously releasable actuation block is formed at one of the both end portions of the cut portion. 
     Furthermore, the simultaneously releasable actuation block operating part and the rotary force conversion member respectively have gear teeth which are in gear-engagement with each other. 
     Additionally, the inclined plane of the rotary force conversion member pushes the bottom of the latch retaining wing of the simultaneously releasable actuation block so as to rotate the simultaneously releasable actuation block. 
     The two-way releasable mortise structure according to the present invention does not need additional devices for converting a direction of the rotary force because the rotary force is always output in only one direction by a rotary force conversion structure built in the mortise structure even though the indoor lever or the outdoor lever is rotated in any direction. 
     Therefore, the present invention is economical because the present invention can be applied to the push-and-pull type door locks regardless of right handed doors and left handed doors. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view showing an outward appearance of a two-way releasable mortise structure according to a preferred embodiment of the present invention; 
         FIG. 2  is a plan view showing the inside structure of the two-way releasable mortise structure according to the preferred embodiment of the present invention; 
         FIG. 3  is a perspective view showing the inside structure of the two-way releasable mortise structure from which an upper case and a lower case are removed; 
         FIG. 4  is an exploded perspective view showing a latch actuation block, a simultaneously releasable actuation block, and their peripheral units of the two-way releasable mortise structure; 
         FIG. 5  is an exploded perspective view showing a latch actuation block, a simultaneously releasable actuation block, and peripheral units of the two-way releasable mortise structure; 
         FIG. 6  is an exploded perspective view of the latch actuation block, the simultaneously releasable actuation block and the peripheral units viewed from the opposite direction of  FIG. 5 ; 
         FIG. 7  is a perspective view of a rotary force converting member of the two-way releasable mortise structure; 
         FIG. 8  is an exploded perspective view showing the rotary force converting member and its peripheral units of the two-way releasable mortise structure; 
         FIG. 9  is a view showing an operational state by an one-way rotation of the latch actuation block of the two-way releasable mortise structure; 
         FIG. 10  is a view showing an operational state by a rotation of the latch actuation block in the opposite direction; 
         FIG. 11  is a view showing the final operational state of by the rotation of the latch actuation block in the opposite direction; 
         FIG. 12  is a view showing an operational state by an one-way rotation of the simultaneously releasable actuation block of the two-way releasable mortise structure; 
         FIG. 13  is a view showing an operational state by a rotation of the simultaneously releasable actuation block in the opposite direction; and 
         FIG. 14  is a view showing the final operational state of by the rotation of the simultaneously releasable actuation block in the opposite direction 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Reference will be now made in detail to the preferred embodiment of the present invention with reference to the attached drawings. 
       FIG. 1  is a perspective view showing an outward appearance of a two-way releasable mortise structure according to a preferred embodiment of the present invention,  FIG. 2  is a plan view showing the inside structure of the two-way releasable mortise structure according to the preferred embodiment of the present invention,  FIG. 3  is a perspective view showing the inside structure of the two-way releasable mortise structure from which an upper case and a lower case are removed,  FIG. 4  is an exploded perspective view showing a latch actuation block, a simultaneously releasable actuation block, and their peripheral units of the two-way releasable mortise structure,  FIG. 5  is an exploded perspective view showing a latch actuation block, a simultaneously releasable actuation block, and peripheral units of the two-way releasable mortise structure,  FIG. 6  is an exploded perspective view of the latch actuation block, the simultaneously releasable actuation block and the peripheral units viewed from the opposite direction of  FIG. 5 ,  FIG. 7  is a perspective view of a rotary force converting member of the two-way releasable mortise structure, and  FIG. 8  is an exploded perspective view showing the rotary force converting member and its peripheral units of the two-way releasable mortise structure. 
     As shown in  FIGS. 1 to 3 , the mortise structure according to the present invention includes an upper case  1  (of an indoor side), a lower case  2  (of an outdoor side), a body front  3 , a latch bolt  10 , a dead bolt  20 , a first latch link  30 , a second latch link  31 , a latch actuation block  40 , a simultaneously releasable actuation block  60 , a power transmission part  100 , and a gear box  110 . 
     The upper case  1  and the lower case  2  protect the components of a digital door lock and are mounted on a door. Moreover, the lower case  2  (of the outdoor side) is provided with an outdoor lever (not shown in the drawings) mounted outside the lower case  2  for allowing a user to actuate the latch bolt  10  to open the door outdoors, and the upper case  1  (of the indoor side) is provided with an indoor lever (not shown in the drawings) mounted outside the upper case  1  for allowing the user to open the latch bolt  10  indoors. 
     The body front  3  is formed on the sides of the upper case  1  and the lower case, namely, on a groove of a door frame, and has holes where the latch bolt  10  and the dead bolt  20  can be extended and retracted. 
     The latch bolt  10  is provided to prevent the door from being opened by itself, namely to keep a closed state of the door, and has a tapered protrusion so that the latch bolt  10  is retracted in contact with the door frame when the door is closed. 
     Furthermore, the latch bolt  10  is transferred together with a latch shaft  11  joined to the latch bolt  10  and a latch plate  12  joined to the latch shaft  11 . That is, the latch shaft  11  is inserted and joined to one side of the latch bolt  10 , and the latch plate  12  having a plate post  13  which may be latched to a first latch link  30  or a second latch link  31  is joined to the other side of the latch shaft  11 . Accordingly, when the latch actuation block  40  or the simultaneously releasable actuation block  60  is actuated by external force and the first latch link  30  or the second latch link  31  in interlock with the latch actuation block  40  or the simultaneously releasable actuation block  60  is rotated so as to pull the plate post  13 , the latch bolt  10  is retracted into the door lock, and when the external force is removed, the latch bolt  10  is extended to the outside from the door lock by elasticity of a latch spring  15  supported on a latch bolt guide. 
     The dead bolt  20  is extended into the hole of the door frame to lock the door or is retracted from the hole of the door frame to unlock the door while moving forward or backward inside a space formed by the upper case  1  and the lower case  2 . The dead bolt  20  is joined with a dead bolt slider  25  disposed at the rear of the dead bolt  20  and having a recess  26 . 
     A closed-state sensor  7  is disposed between the latch bolt  10  and the dead bolt  20  for automatically getting the dead bolt  20  forward after checking a closed state of the door. 
     The first latch link  30  and the second latch link  31  are adapted to unlock the door by pulling the latch bolt, are formed in a boomerang shape, and are rotatably mounted on the lower case and rotated on a latch link shaft  33  as the axis of rotation. The first latch link  30  and the second latch link  31  respectively tow the lower end and the upper end of the plate post  13  disposed on the latch plate  12  so as to unlock the latch bolt  10 . 
     As shown in  FIGS. 4 to 6 , the latch actuation block  40 , a latch actuation block operating part  50 , the simultaneously releasable actuation block  60 , a simultaneously releasable actuation block operating part  70 , and a latch actuation block interlocking part  80  are rotated by an actuation of the indoor lever or the outdoor lever, and are joined on the same rotary shaft. 
     The latch actuation block operating part  50 , the simultaneously releasable actuation block operating part  70 , and the latch actuation block interlocking part  80  respectively have joining holes  55 ,  74  and  85  to which an outdoor lever shaft  9  or an indoor lever shaft  8  is joined. In other words, the latch actuation block operating part  50  and the latch actuation block interlocking part  80  respectively have the polygonal outdoor lever joining holes  55  and  85  to which the outdoor lever shaft  9 , which is a rotary shaft of the outdoor lever, is joined, and the simultaneously releasable actuation block operating part  70  has the polygonal indoor lever joining hole  74  to which the indoor lever shaft  8 , which is a rotary shaft of the indoor lever, is joined. Cross sectional shapes of the outdoor lever shaft  9  and the indoor lever shaft  8  are respectively a square and a hexagon, and the joining holes  55 ,  74  and  85  of the latch actuation block operating part  50 , the simultaneously releasable actuation block operating part  70 , and the latch actuation block interlocking part  80  respectively have shapes corresponding to the shapes of the outdoor lever shaft  9  and the indoor lever shaft  8 . Therefore, when the indoor lever shaft  8  is first inserted into the lower end of the latch actuation block operating part  50 , the indoor lever shaft  8  penetrates through the outdoor lever joining hole  55 , the indoor lever joining hole  74  and the outdoor lever joining hole  85 , and the outdoor lever shaft  9  is inserted just into the outdoor lever joining hole  55 . In other words, the indoor lever joining hole  74  is smaller than the outdoor lever joining holes  55  and  85  and the indoor lever shaft  8  is also smaller than the outdoor lever shaft  9 , such that the indoor lever shaft  8  is closely seated into the indoor lever joining hole  74  after penetrating through the outdoor lever joining hole  55 , but the outdoor lever shaft  9  does not penetrate through the indoor lever joining hole  74  and the upper end of the outdoor lever shaft  9  is closely seated into the outdoor lever joining hole  55 . 
     The outdoor lever shaft  9  and the indoor lever shaft  8  are independently rotatably joined to each other through a ball joint (not shown in the drawings). 
     The latch actuation block  40  which tows the first latch link  30  in order to unlock the latch bolt  10  has a circular inner space, is in a ring shape having a cut portion at one side, and includes: a first latched wing  41  formed at one side thereof; a first pressure receiving portion  45  formed at an end portion of the cut portion; and a guide protrusion  47  formed at one side and forcedly fit into an arc-shaped through hole formed in the outer case  2 . The latch actuation block  40  further includes a second pressure receiving portion  42  curvedly formed at a lower portion of the first latch retaining wing  41  and a first latch pressurizing portion  43  formed at an upper portion of the first latch retaining wing  41  to tow the first latch link  30 . 
     The latch actuation block operating part  50  which is adapted to rotate the latch actuation block  40  includes: a round protrusion  51  inserted into the circular inner space of the latch actuation block  40 ; and gear teeth  52  formed on one side of the rim of the protrusion  51  within a predetermined angle range. The side of the gear tooth located at the outermost position of the gear teeth is a first interlock pressure portion  53 . The latch actuation block operating part  50  further includes: a seating recess  54  formed at the center of the opposite side for seating the simultaneously releasable actuation block  60  thereon; a protruding guide  57  formed at the outer edge; and a joining protrusion  58  and a joining hole  59  formed at the top of the protruding guide  57 . The latch actuation block operating part  50  has the square outdoor lever joining hole  55  formed at the center thereof. 
     The simultaneously releasable actuation block  60  which tows the second latch link and rotates the dead bolt operating lever  103  has a circular inner space, is in a ring shape having a cut portion at one side, and includes: a second latch retaining wing  62  and a dead bolt retaining wing  66  formed at one side thereof; a third pressure receiving portion  61  formed at an end portion of the cut portion. The simultaneously releasable actuation block  60  further includes a fourth pressure receiving portion  63  curvedly formed at a lower portion of the second latch retaining wing  62  and a second latch pressurizing portion  64  formed at an upper portion of the second latch retaining wing  62  to tow the second latch link  31 . 
     The simultaneously releasable actuation block operating part  70  which is adapted to rotate the simultaneously releasable actuation block  60  is formed in a cylindrical shape, is inserted into the circular inner space of the simultaneously releasable actuation block  60 , and has gear teeth  72  formed at one side of the rim thereof within a predetermined angle range. The side of the gear tooth located at the outermost position of the gear teeth  72  is a second interlock pressure portion  73 . The simultaneously releasable actuation block operating part  70  further includes: the indoor lever joining hole  74  formed at the center thereof in a hexagonal shape; and a protrusion  76  formed at one side thereof and inserted into the seating recess  54  of the latch actuation block operating part  50 . 
     The latch actuation block interlocking part  80  is located on the opposite side of the latch actuation block  40  in a state where the simultaneously releasable actuation block operating part  70  is interposed between latch actuation block interlocking part  80  and the latch actuation block  40  and is joined to the latch actuation block operating part  50 . The latch actuation block interlocking part  80  which transfers a rotary force received from the outdoor lever to the latch actuation block operating part  50  so as to rotate the latch actuation block  40  includes the outdoor lever joining hole  85  formed at the center thereof; and an outer protrusion  81  formed at one side thereof within a predetermined angle section. The latch actuation block interlocking part  80  forms a space at the circumferential portion thereof excepting the outer protrusion  81  so that the gear teeth of the simultaneously releasable actuation block operating part  70  can be rotated in the space. 
     The outer protrusion  81  has a joining hole  82  to which a fixing piece is joined so as to be joined with the protrusion guide  57  of the latch actuation block operating part  50 . The latch actuation block interlocking part  80  can transfer the rotary force of the outdoor lever to the latch actuation block operating part  50  regardless of whether the outdoor lever is joined to the front face or the rear face of the door lock, thereby realizing a door lock applicable not only to a right handed door but also to a left handed door. 
     Operational relationship among the latch actuation block  40 , the latch actuation block operating part  50 , the simultaneously releasable actuation block  60 , the simultaneously releasable actuation block operating part  70 , and the latch actuation block interlocking part  80  will be described as follows. 
     When the latch actuation block operating part  50  is rotated, the latch actuation block interlocking part  80  joined integrally with the latch actuation block operating part  50  is rotated, and the latch actuation block  40  pressurized by the latch actuation block operating part  50  is also rotated. In this instance, the simultaneously releasable actuation block  60  and the simultaneously releasable actuation block operating part  70  are not rotated. The reason is that the simultaneously releasable actuation block  60  and the simultaneously releasable actuation block operating part  70  are independently operated without any interlocking structure with the latch actuation block  40 , the latch actuation block operating part  50 , and the latch actuation block interlocking part  80 . 
     In the meantime, when the simultaneously releasable actuation block operating part  70  is rotated, the simultaneously releasable actuation block  60  pressurized by the simultaneously releasable actuation block operating part  70  is also rotated, and in this instance, the latch actuation block  40 , the latch actuation block operating part  50 , and the latch actuation block interlocking part  80  are not rotated. The reason is that the latch actuation block  40 , the latch actuation block operating part  50 , and the latch actuation block interlocking part  80  are independently operated without any interlocking structure with the simultaneously releasable actuation block  60  and the simultaneously releasable actuation block operating part  70 . 
     As shown in  FIGS. 7 and 8 , a rotary force converting member  90  serves to change a direction of the rotary force of the indoor lever or the outdoor lever and transfer the rotary force to the latch actuation block  40  or the simultaneously releasable actuation block  60 , and includes: a latch operation side rack gear  91  which is geared with the latch actuation block operating part  50 ; a simultaneous operation side rack gear  95  geared with the simultaneously releasable actuation block operating part  70 ; and a slide guiding portion  98 . 
     The latch operation side rack gear  91  is located beneath the latch actuation block operating part  50  and includes: a first rack gear  92  formed on an upper portion thereof and geared with the gear teeth of the latch actuation block operating part  50 ; a first inclined pressurizing portion  93  formed at one end and having an inclined plane; and a first guide protrusion  94  formed on the side of the latch operation side rack gear  91  and seated on a side upper portion  99  of the slide guiding portion  98 . The latch operation side rack gear  91  is arranged in such a manner that the first inclined pressurizing portion  93  abuts on the second pressure receiving portion  42  of the latch actuation block  40 . 
     The simultaneous operation side rack gear  95  is located beneath the simultaneously releasable actuation block operating part  70  and includes: a second rack gear  96  formed on an upper portion thereof and geared with the gear teeth of the simultaneously releasable actuation block operating part  70 ; a second inclined pressurizing portion  97  formed at one end and having an inclined plane; and a second guide protrusion (not shown in the drawings) formed on the side of the simultaneous operation side rack gear  95  and serving the same role as the first guide protrusion  94  which is seated on the side upper portion  99  of the slide guiding portion  98 . The simultaneous operation side rack gear  95  is arranged in such a manner that the second inclined pressurizing portion  97  abuts on the fourth pressure receiving portion  63  of the simultaneously releasable actuation block  60 . 
     The slide guiding portion  98  has the tiered side upper portions  99  respectively formed at both sides thereof so as to guide the guide protrusions of the simultaneous operation side rack gear  95  and the latch operation side rack gear  91  to slidably move on the tiered side upper portions  99 . 
     The gear box  110  includes a motor (not shown in the drawings) and reduction gears (not shown in the drawings) connected with the motor, and serves to transfer a rotary force of the motor to the power transmission part which will be described later. A detailed description of the gear box  110  will be omitted because the gear box has been widely used. 
     The power transmission part  100  transfers the external force or the driving force of the motor to the dead bolt  20  to thereby transfer the dead bolt  20 . The power transmission part  100  is rotated by the driving force of the gear box  110  including the motor, rotated by receiving a rotary force through a knob, or rotated by the rotary force transferred from the indoor lever to thereby transfer the dead bolt  20 . 
     The power transmission part  100  includes a gear lever  101 , a dead bolt operation lever  103  having the same rotary shaft as the gear lever  101 , and an O-ring (not shown in the drawings). 
     The gear lever  101  has gear teeth formed on the circumferential surface thereof, and can rotate by receiving the rotary force from the gear box  110  through a gear engagement. The gear lever  101  is joined with the dead bolt operation lever  103  in a state where a rotational fragment (not shown) and the O-ring (not shown) are interposed therebetween. In other words, the gear lever  101  has the rotational fragment joined to the inside of the gear lever  101  through the O-ring, and the rotary force is transferred when the rotational fragment is caught to the dead bolt operation lever  103 . The rotational fragment has an arc-shaped elongated hole of a predetermined length and the dead bolt operation lever  103  has a protrusion caught to the elongated hole, so that rotation of the rotational fragment is transferred to the dead bolt operation lever  103  just when the protrusion of the dead bolt operation lever  103  is caught to the end of the elongated hole of the rotational fragment when the gear lever  101  is rotated. The reason is to prevent the rotary force from being transferred to the gear box when the dead bolt operation lever  103  is rotated by the indoor lever by means of an idle space between the elongated hole of the rotational fragment and the protrusion of the dead bolt operation lever  103 . 
     The dead bolt operation lever  103  which serves to transfer the dead bolt  20  includes: a manipulation arm  104  extended in one direction; an arc-shaped fifth pressure receiving portion  105  protrudingly formed on an upper portion of the manipulation arm  104  and pressurized by the dead bolt retaining wing  66  of the simultaneously releasable actuation block  60 ; and a dead bolt pressurizing portion  106  formed beneath the fifth pressure receiving portion  105  for selectively pressurizing one of both sides of the recess  26  of the dead bolt slider  25  connected to the dead bolt  20  to thereby transfer the dead bolt  20 . Therefore, when the gear lever  101  is rotated by receiving the driving force from the gear box  110 , the dead bolt operation lever  103  is rotated to transfer the dead bolt  20 . Alternatively, when the indoor lever is rotated, the dead bolt retaining wing  66  of the simultaneously releasable actuation block  60  pushes the fifth pressure receiving portion  105  of the dead bolt operation lever  103 , so that the dead bolt operation lever  103  transfers the dead bolt  20  while rotating. In this instance, a dead bolt spring  107  is joined between the dead bolt operation lever  103  and the lower case  2 . Accordingly, when the manipulation arm  104  of the dead bolt operation lever  103  is rotated to a predetermined angle, the dead bolt spring  107  gives a rotary force to the dead bolt operation lever  103 , and hence the manipulation arm  104  of the dead bolt operation lever  103  strongly pushes the dead bolt  20 , so that the dead bolt  20  is retracted. 
     Hereinafter, the operation of the two-way releasable mortise structure according to the present invention will be described. 
       FIG. 9  is a view showing an operational state by an one-way rotation of the latch actuation block of the two-way releasable mortise structure,  FIG. 10  is a view showing an operational state by a rotation of the latch actuation block in the opposite direction, and  FIG. 11  is a view showing the final operational state of by the rotation of the latch actuation block in the opposite direction. 
     First, the operation of the two-way releasable mortise structure when the outdoor lever is rotated in the counter clockwise direction will be described. 
     As shown in  FIG. 9 , when the outdoor lever is rotated in the counter clockwise direction, the latch actuation block operating part  50  joined to the outdoor lever is rotated in the counter clockwise direction and the first interlock pressure portion  53  of the latch actuation block operating part  50  pushes the first pressure receiving portion  45  of the latch actuation block  40 , so that the latch actuation block  40  is rotated in the counter clockwise direction. In this instance, the latch operation side rack gear  91  which is geared with the latch actuation block operating part  50  is moved to the right. When the latch actuation block  40  rotates in the counter clockwise direction, the first latch retaining wing  41  tows and rotates the first latch link  30 , and the first latch link  30  pulls the plate post  13  so as to retract the latch bolt  10  into the door lock. 
     Next, the operation of the two-way releasable mortise structure when the outdoor lever is rotated in the clockwise direction will be described. 
     As shown in  FIGS. 10 and 11 , when the outdoor lever is rotated in the clockwise direction, the latch actuation block operating part  50  is rotated in the clockwise direction and the latch operation side rack gear  91  which is geared with the latch actuation block operating part  50  is moved to the left. When the latch operation side rack gear  91  is moved to the left, the first inclined pressurizing portion  93  of the latch operation side rack gear  91  pushes up the second pressure receiving portion  42  of the latch actuation block  40 , and when the second pressure receiving portion  42  of the latch actuation block  40  is pushed up, the latch actuation block  40  is rotated in the counter clockwise direction. When the latch actuation block  40  is rotated in the counter clockwise direction, the first latch retaining wing  41  tows and rotates the first latch link  30 , and the first latch link  30  pulls the plate post  13  so as to retract the latch bolt  10  into the door lock. The latch operation side rack gear  91  serves to change the direction of the rotary force of the outdoor lever and transfer the rotary force to the latch actuation block  40 . 
     Now, the operation of the two-way releasable mortise structure when the indoor lever is rotated in the clockwise direction will be described. 
     As shown in  FIG. 12 , when the indoor lever is rotated in the clockwise direction, the simultaneously releasable actuation block operating part  70  is rotated in the clockwise direction and the second interlock pressure portion  73  of the simultaneously releasable actuation block operating part  70  pushes the fourth pressure receiving portion  63  of the simultaneously releasable actuation block  60 , so that the simultaneously releasable actuation block  60  is rotated in the clockwise direction. In this instance, the simultaneous operation side rack gear  95  which is geared with the simultaneously releasable actuation block operating part  70  is moved to the left. When the simultaneously releasable actuation block  60  rotates in the clockwise direction, the second latch retaining wing  62  tows and rotates the second latch link  31 , and the second latch link  31  pulls the plate post  13  so as to retract the latch bolt  10  into the door lock and the dead bolt retaining wing  66  rotates the dead bolt operation lever  103  so as to retract the dead bolt  20  into the door lock. 
     Next, the operation of the two-way releasable mortise structure when the indoor lever is rotated in the counter clockwise direction will be described. 
     As shown in  FIGS. 13 and 14 , when the indoor lever is rotated in the counter clockwise direction, the simultaneously releasable actuation block operating part  70  is rotated in the counter clockwise direction and the simultaneous operation side rack gear  95  which is geared with the gear teeth  72  of the simultaneously releasable actuation block operating part  70  is moved to the right. When the simultaneous operation side rack gear  95  is moved to the right, the second inclined pressurizing portion  97  of the simultaneous operation side rack gear  95  pushes up the fourth pressure receiving portion  63  of the simultaneously releasable actuation block  60 , and when the fourth pressure receiving portion  63  of the simultaneously releasable actuation block  60  is pushed up, the simultaneously releasable actuation block  60  is rotated in the clockwise direction. When the simultaneously releasable actuation block  60  is rotated in the clockwise direction, the second latch retaining wing  62  tows and rotates the first latch link  30 , and the first latch link  30  pulls the plate post  13  so as to retract the latch bolt  10  into the door lock, and the dead bolt retaining wing  66  rotates the dead bolt operation lever  103  so as to retract the dead bolt  20  into the door lock. That is, the simultaneous operation side rack gear  95  serves to rotate the simultaneously releasable actuation block  60  in the opposite direction to the direction of the rotary force of the indoor lever. 
     As described above, because the simultaneously releasable actuation block  60  is always rotated in the clockwise direction, namely, in the direction to unlock the latch bolt  10  and the dead bolt  20 , regardless of whether the indoor lever is rotated in the clockwise direction or in the counter clockwise direction, the latch bolt  10  and the dead bolt  20  can be unlocked even though the indoor lever is rotated in any direction. 
     As described above, in the case that the mortise structure according to the present invention is mounted to the left handed door or the right handed door, the mortise structure can unlock the latch bolt or the dead bolt when the latch actuation block  40  or the simultaneously releasable actuation block  60  is rotated in the same rotational direction because the latch actuation block  40  or the simultaneously releasable actuation block  60  is rotated in the direction to unlock the latch bolt or the dead bolt even though the indoor lever or the outdoor lever is rotated in any direction of the clockwise direction and the counter clockwise direction. In the case of the door locks according to the prior arts, the rotational direction of the outside handle or the indoor lever must be changed according to the right handed door and the left handed door because the latch actuation block or the simultaneously releasable actuation block of the door lock must be changed in rotational direction according to the right handed door and the left handed door. Additionally, in the case of the push-and-pull open type door locks, because the user can take only an action to pull the knob outside the door and take only an action to push the knob inside the door, in order to change the rotational direction of the latch actuation block or the simultaneously releasable actuation block of the door lock, different power conversion modules for converting a rectilinear motion into a rotational motion must be mounted according to the right handed door and the left handed door. However, the mortise structure according to the present invention does not need such a component for changing the rotation direction of the knob according to the right handed door and the left handed door because the latch bolt  10  or dead bolt  20  of the door lock can be unlocked regardless of the rotational direction of the latch actuation block  40  or the simultaneously releasable actuation block  60  of the door lock. Particularly, in the case that the mortise structure of the present invention is applied to the push-and-pull open type door lock, there is no need to be provided with two types of power conversion modules. 
     Moreover, the mortise structure according to the present invention has a panic function that only the latch bolt  10  is unlocked when the outdoor lever is manipulated and the latch bolt  10  and the dead bolt  20  are simultaneously unlocked when the indoor lever is manipulated. However, when the outdoor lever and the indoor lever are manipulated, the latch bolt  10  is (or the latch bolt  10  and the dead bolt  20  are) unlocked by movements of the completely independent components. That is, because the manipulation of the indoor lever has absolutely no effect on the outdoor lever, there is no concern that the user located outdoors hurts his or her hand by an unintended movement of the outdoor lever. 
     Furthermore, in emergency circumstances such as fires, even though the outdoor lever is not rotatable due to breakdown or damage, because the latch actuation block  40  joined to the outdoor lever and the simultaneously releasable actuation block  60  joined to the indoor lever are rotated completely independently, the user can rotate the indoor lever in order to rapidly open the door and escape from the space. 
     The terms of the outdoor lever and the indoor lever used in the present invention comprehensively name components formed at the outdoor side and the indoor side for transferring the rotary force to the door lock so as to unlock the door lock, and it is interpretable that the outdoor lever and the indoor lever may be a rotatable knob, actuating means of the push-and-pull open type door lock, and other alternative actuating means. 
     In the present invention, the simultaneous operation side rack gear  95  and the latch operation side rack gear  91  are used as the rotary force conversion member  90  which transfers the rotary force to the latch actuation block  40  and the simultaneously releasable actuation block  60  by the rotation of the latch actuation block operating part  50  and the simultaneously releasable actuation block operating part  70 , but it is just an example of the power transmission way of the latch actuation block operating part  50  and the simultaneously releasable actuation block operating part  70  and the rotary force conversion member  90 , and in the present invention, the power transmission way of the latch actuation block operating part  50  and the simultaneously releasable actuation block operating part  70  and the rotary force conversion member  90  may be realized not by the gear engagement but by one of various well-known methods. For instance, the latch actuation block operating part  50  and the simultaneously releasable actuation block operating part  70  may respectively have retaining protrusions in place of the gear teeth and the rotary force conversion member  90  may be caught to the retaining protrusions to thereby take a rectilinear slide motion. 
     While the present invention has been particularly shown and described with reference to the example embodiment thereof, it will be understood by those of ordinary skill in the art that various changes, modifications and equivalents may be made therein without departing from the technical idea and scope of the present invention as defined by the following claims.