Patent Publication Number: US-2021170834-A1

Title: Flush Glass Apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims priority to Korean Patent Application No.  10 - 2019 - 0163607 , filed on December  10 ,  2019 , which application is hereby incorporated herein by reference. 
     TECHNICAL FIELD 
     The disclosure relates to a flush glass apparatus. 
     BACKGROUND 
     Large passenger vehicles such as RVs (Recreational Vehicles) and SUVs (Sport Utility Vehicles) are equipped with a flush glass apparatus. 
     The flush glass apparatus includes a fixed glass having an opening, an operation glass moving in a sliding manner to open and close the opening of the fixed glass, and a locking device locking the operation glass in a closed state or releasing the locking to open the operation glass. 
     The locking device may include locking pins installed on the operation glass to be able to ascend and descend, restoration springs restoring the locking pins in a locking direction, and a plurality of operation handles for moving the locking pins in an unlocking direction. 
     However, because the flush glass apparatus described above has a structure in which a user moves the plurality of operation handles in the vertical direction to unlock the restoration springs, it is difficult to open and close the operation glass. In addition, because the plurality of operation handles is not restored during the opening of the operation glass, it is difficult to provide a beautiful appearance. 
     SUMMARY 
     The disclosure relates to a flush glass apparatus. Particular embodiments relate to a flush glass apparatus capable of easily opening and closing an operation glass and stably binding the operation glass when the operation glass is closed. 
     It is an aspect of embodiments of the disclosure to provide a flush glass apparatus capable of easily opening and closing an operation glass by an easy operation of a locking device. 
     It is another aspect of embodiments of the disclosure to provide a flush glass apparatus capable of providing a beautiful appearance by restoring an operation handle in a state in which an operation glass is opened or closed. Additional aspects of embodiments of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure. 
     In accordance with an embodiment of the disclosure, a flush glass apparatus includes an operation glass including a glass portion and a frame and configured to open and close an opening of a fixed glass by sliding in a lateral direction, and a locking device configured to lock and unlock the operation glass, wherein the locking device includes an operation handle installed on the frame to be rotated left and right and configured to be restored to its original state by a restoration spring, an upper locking lever installed on an upper side of the frame and configured to lock the operation glass by rotating in a locking direction by an elastic restoring force when the operation glass is completely closed, a first lower locking lever installed on a lower side of the frame and configured to lock the operation glass by rotating in the locking direction by an elastic restoring force when the operation glass is completely closed, a second lower locking lever installed on the lower side of the frame and configured to lock the operation glass by rotating in the locking direction by an elastic restoring force when the operation glass is completely opened, an upper operation member installed on the upper side of the frame, connected to the operation handle, and configured to rotate the upper locking lever in a direction of releasing the locking when rotating in an opening direction by an operation of the operation handle, and a lower operation member installed on the lower side of the frame, connected to the operation handle, and configured to rotate the first lower locking lever in the direction of releasing the locking when rotating in the opening direction by the operation of the operation handle and to rotate the second lower locking lever in the direction of releasing the locking when rotating in a closing direction by the operation of the operation handle. 
     The flush glass apparatus may further include an upper rail comprising an upper guide groove to slidingly support guide pins provided on an upper portion of the frame, and a lower rail comprising a lower guide groove to slidingly support guide pins provided on a lower portion of the frame. 
     The upper guide groove and the lower guide groove each may include a curved guide portion configured to induce the guide pins to an outdoor side so that an outer surface of the operation glass forms the same plane as an outer surface of the fixed glass when the operation glass is completely closed, and a locking groove formed deeper upward or downward than the upper guide groove or the lower guide groove so that the upper locking lever or the first lower locking lever is caught thereon in a state in which the operation glass is completely closed. 
     The upper locking lever may include an upper locking portion provided at an eccentric position from a rotation shaft thereof and configured to enter the locking groove of the upper guide groove by rotation, and a contact portion pressed by an eccentric rotation portion of the upper operation member to rotate in the direction of releasing the locking when the upper operation member rotates in the direction of opening the operation glass. 
     The lower guide groove may include a plurality of intermediate locking grooves formed deeper downward than the lower guide groove at positions spaced apart from each other in a moving direction of the operation glass so that the first lower locking lever or the second lower locking lever is caught thereon in a process of opening or closing the operation glass, and a locking groove formed deeper downward than the lower guide groove so that the second lower locking lever is caught thereon in a state in which the operation glass is completely opened. 
     The first lower locking lever may include a first lower locking portion provided at an eccentric position from a rotation shaft thereof and configured to enter a closed-side locking groove of the lower guide groove or one of the intermediate locking grooves by rotation, and a first contact portion pressed by an eccentric rotation portion of the lower operation member to rotate in the direction of releasing the locking when the lower operation member rotates in the direction of opening the operation glass. 
     The second lower locking lever may include a second lower locking portion provided at an eccentric position from a rotation shaft thereof and configured to enter an opened-side locking groove of the lower guide groove or one of the intermediate locking grooves by rotation, and a second contact portion pressed by the eccentric rotation portion of the lower operation member to rotate in the direction of releasing the locking when the lower operation member rotates in the direction of closing the operation glass. 
     The first lower locking portion may include a first curved portion provided at a lower side of a side surface thereof in the closing direction so that the operation glass moves beyond the intermediate locking groove when moving in the closing direction. 
     The second lower locking portion may include a second curved portion provided at a lower side of a side surface thereof in the opening direction so that the operation glass moves beyond the intermediate locking groove when moving in the opening direction. 
     A width of the intermediate locking groove in the opening and closing directions may be equal to or larger than a width of the first or second lower locking portion in the opening and closing directions. 
     The flush glass apparatus may further include an upper connection shaft connecting the upper operation member and the operation handle and rotatably supported on the frame, and a lower connection shaft connecting the lower operation member and the operation handle and rotatably supported on the frame. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and/or other aspects of the disclosure will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which: 
         FIG. 1  is a front view of a flush glass apparatus according to an embodiment of the disclosure when an operation glass is closed; 
         FIG. 2  is a front view of the flush glass apparatus according to an embodiment of the disclosure when the operation glass is opened; 
         FIG. 3  is a perspective view illustrating a state in which the operation glass of the flush glass apparatus according to an embodiment of the disclosure is separated from a fixed glass; 
         FIG. 4  is an exploded perspective view of parts of the fixed glass side of the flush glass apparatus according to an embodiment of the disclosure; 
         FIG. 5  is an exploded perspective view of the operation glass and a locking device of the flush glass apparatus according to an embodiment of the disclosure; 
         FIGS. 6A and 6B  are perspective views of the locking device of the flush glass apparatus according to an embodiment of the disclosure, illustrating a state before operation and a state after operation, respectively; 
         FIGS. 7A and 7B  are perspective views of first and second lower locking levers and a lower operation member in the locking device of the flush glass apparatus according to an embodiment of the disclosure, illustrating operations when the operation glass is closed and opened, respectively; 
         FIGS. 8A and 8B  are front views of the first and second lower locking levers and the lower operation member in the locking device of the flush glass apparatus according to an embodiment of the disclosure, illustrating operations when the operation glass is closed and opened, respectively; 
         FIGS. 9A and 9B  are perspective views of an upper locking lever and an upper operation member in the locking device of the flush glass apparatus according to an embodiment of the disclosure, illustrating operations step by step when the operation glass is closed; 
         FIGS. 10A and 10B  are front views of the upper locking lever and the upper operation member in the locking device of the flush glass apparatus according to an embodiment of the disclosure, illustrating operations when the operation glass is closed and opened, respectively; 
         FIG. 11  illustrates a plurality of intermediate locking grooves provided in a lower guide groove of the flush glass apparatus according to an embodiment of the disclosure; and 
         FIG. 12  is a front view of the first and second lower locking levers and the lower operation member in the locking device of the flush glass apparatus according to an embodiment of the disclosure, illustrating an operation when passing through the intermediate locking groove of the lower guide groove. 
     
    
    
     DETAILED DESCRIPTION OF ILLUSTRATIVE EMBODIMENTS 
     Hereinafter embodiments of the disclosure will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the disclosure. The disclosure is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the disclosure, pails not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. 
     Referring to  FIGS. 1 and 2 , a flush glass apparatus according to an embodiment of the disclosure includes a fixed glass  100  provided with an opening  101 , an operation glass  200  configured to move in a lateral sliding manner to open and close the opening  101  of the fixed glass  100 , and a locking device  300  configured to lock the operation glass  200  in a state of being closed or release the locking to open the operation glass  200 . 
     The fixed glass  100  may be formed in a rectangular panel shape having a long length in a transverse direction, as illustrated in  FIGS. 3 and 4 . The fixed glass  100  may be mounted in a state in which a rim portion thereof is sealed on a side surface of a vehicle body (not shown). The fixed glass  100  includes a see-through glass portion  103  and the opening  101  that is opened and closed by the operation glass  200 . 
     A sealing member no, an upper rail  120 , a lower rail  130 , and a connection rail  140  may be mounted on an inner surface of the fixed glass  100 . 
     The sealing member  110  is installed along an inner side of the rim portion of the fixed glass  100  so that the fixed glass  100  may maintain sealing when mounted on the vehicle body. The upper rail  120  guides a lateral sliding of the operation glass  200  while supporting an upper side of the operation glass  200 , and the lower rail  130  guides the lateral sliding of the operation glass  200  while supporting a lower side of the operation glass  200 . The connection rail  140  connects a front end of the upper rail  120  and a front end of the lower rail  130  at an inner side of the fixed glass  100  and is coupled to a front end of the operation glass  200  when the operation glass  200  is closed, so that the opening  101  may be sealed as illustrated in  FIG. 1 . 
     The operation glass  200  includes a see-through glass portion  210 , a frame  220  supporting a rim portion of the glass portion  210 , and a sealing member  230  coupled to an inner surface of a rim portion of the frame  220 , as illustrated in  FIGS. 3 and 5 . 
     The rim portion of the glass portion  210  is attached to the frame  220 , and the sealing member  230  is mounted on the frame  220  in a form surrounding a circumference of the glass portion  210 . The sealing member  230  seals a gap between the operation glass  200  and the fixed glass  100  while coming into close contact with the inner surface of the fixed glass  100  when the operation glass  200  is closed. 
     Referring to  FIGS. 4 and 5 , the operation glass  200  includes upper guide pins  221  and  222  provided on opposite sides of an upper portion thereof to be coupled to the upper rail  120 , and lower guide pins  223  and  224  provided on opposite sides of a lower portion thereof to be coupled to the lower rail  130 . 
     The upper rail  120  is provided with a front upper guide groove and a rear upper guide groove extending in a lengthwise direction to slidably support the upper guide pins  221  and  222 , respectively. The lower rail  130  is provided with a front lower guide groove  132  and a rear lower guide groove  133  extending in a lengthwise direction to slidably support the lower guide pins  223  and  224 , respectively. Therefore, the operation glass  200  may slide in opening and closing directions without being separated from the upper rail  120  and the lower rail  130 . Although the drawings do not clearly illustrate the front upper guide groove and the rear upper guide groove of the upper rail  120 , they may be provided similar to the front lower guide groove  132  and the rear lower guide groove  133  of the lower rail  130  illustrated in  FIG. 4 . 
     As illustrated in  FIGS. 5, 6A, and 6B , the locking device  300  may include an operation handle  310 , an upper operation member  320 , a lower operation member  330 , an upper connection shaft  341 , a lower connection shaft  342 , an upper connection pin  343 , a lower connection pin  344 , a restoration spring  345 , an upper locking lever  350 , a first lower locking lever  360 , and a second lower locking lever  370 . 
     The operation handle  310  may be installed in a state of being exposed to an outer side of the frame  220  so that a user may easily operate the operation handle  310 , and the remaining parts of the locking device  300  may be accommodated in the frame  220  or installed in a state of being exposed to a rear surface of the frame  220 . 
     The operation handle  310  may be installed on a vertically middle portion of the frame  220  to be rotatable in the left and right directions. The operation handle  310  may be restored to its original state by an elastic restoring force of the restoration spring  345  installed on the lower connection shaft  342  side when an operation force by the user is released. 
     The upper operation member  320  is connected to the upper connection shaft  341  whose lower side is rotatably supported on the frame  220 . The upper connection shaft  341  is connected so that the lower side thereof rotates together with the operation handle  310 . Therefore, the upper operation member  320  may rotate together when the operation handle  310  rotates. The upper operation member  320  includes an eccentric rotation portion  321  to operate the upper locking lever  350  when rotated by the operation of the operation handle  310 . 
     The lower operation member  330  is connected to the lower connection shaft  342  whose upper side is rotatably supported on the frame  220 . The lower connection shaft  342  is connected so that an upper side thereof rotates together with the operation handle  310 . Therefore, the lower operation member  330  may rotate together when the operation handle  310  rotates. The lower operation member  330  includes an eccentric rotation portion  331  to operate the first lower locking lever  360  or the second lower locking lever  370  when rotated by the operation of the operation handle  310 . 
     Referring to  FIG. 5 , the upper connection shaft  341  and an upper side of the operation handle  310  may be rotatably supported on the frame  220  by mounting the upper connection pin  343  at a rotation center thereof. The lower connection shaft  342  and a lower side of the operation handle  310  may be rotatably supported on the frame  220  by mounting the lower connection pin  344  at a rotation center thereof. The restoration spring  345  may be installed on the lower connection shaft  342  when the lower connection pin  344  is mounted. 
     The upper locking lever  350  is rotatably installed on an upper side of the frame  220 , as illustrated in  FIGS. 5, 6A, 9A, and 9B . The upper locking lever  350  includes a rotation shaft  351  rotatably supported in a state of being accommodated in the upper side of the frame  220 , a connection portion  352  extending forward from the rotation shaft  351 , an upper locking portion  353  extending upward from an end of the connection portion  352  and protruding to the upper side of the frame  220 , and a contact portion  354  that is pressed by the eccentric rotation portion  321  of the upper operation member  320 . 
     On the rotation shaft  351  of the upper locking lever  350 , a restoration spring  356  (see  FIG. 5 ) is installed to rotate the upper locking lever  350  so that the upper locking portion  353  may protrude upward. Therefore, as illustrated in  FIGS. 9A, 9B, and 10A , the upper locking lever  350  may maintain a state in which the upper locking portion  353  normally enters an upper guide groove  123  of the upper rail  120  by an elastic restoring force of the restoration spring  356 , and may be caught on a locking groove  125  formed at a front end of the upper guide groove  123 . That is, as illustrated in  FIGS. 9B and 10A , when the operation glass  200  is completely closed, the upper locking lever  350  may be rotated in a locking direction by the elastic restoring force of the restoration spring  356  so that the upper locking portion  353  enters the locking groove  125  to lock the operation glass  200 . 
     As illustrated in  FIGS. 6B and 10B , when the upper operation member  320  is rotated in a direction of opening the operation glass  200  by the operation of the operation handle  310 , the upper locking lever  350  may be rotated in a direction of releasing the locking by the contact portion  354  being pressed by the eccentric rotation portion  321  of the upper operation member  320 . 
     As illustrated in  FIGS. 5, 7A, 7B, 8A, and 8B , the first lower locking lever  360  is rotatably installed on a lower side of the frame  220  in the vertical direction. The first lower locking lever  360  includes a rotation shaft  361  rotatably supported in a state of being accommodated in the lower side of the frame  220 , a connection portion  362  extending forward from the rotation shaft  361 , a first lower locking portion  363  extending downward from an end of the connection portion  362  and protruding to the lower side of the frame  220 , and a first contact portion  364  that is pressed by the eccentric rotation portion  331  of the lower operation member  330 . 
     On the rotation shaft  361  of the first lower locking lever  360 , a restoration spring  366  (see  FIG. 5 ) is installed to rotate the first lower locking lever  360  so that the first lower locking portion  363  may protrude downward. Therefore, as illustrated in  FIGS. 7A, 7B, and 8A , the first lower locking lever  360  may maintain a state in which the first lower locking portion  363  normally enters the lower guide groove  133  of the lower rail  130  and may be caught on a locking groove  135  (a closed-side locking groove) formed at a front end of the lower guide groove  133 . Also, the first lower locking portion  363  may be caught on a plurality of intermediate locking grooves  136  formed in the lower guide groove  133 . As illustrated in  FIGS. 7B and 8A , when the operation glass  200  is completely closed, the first lower locking lever  360  may be rotated in a locking direction by an elastic restoring force of the restoration spring  366  so that the first lower locking portion  363  enters the locking groove  135  to lock the operation glass  200 . 
     As illustrated in  FIGS. 6B and 8B , when the lower operation member  330  is rotated in the direction of opening the operation glass  200  by the operation of the operation handle  310 , the first lower locking lever  360  may be rotated in the direction [a direction in which the first lower locking portion  363  ascends] of releasing the locking by the first contact portion  364  being pressed by the eccentric rotation portion  331  of the lower operation member  330 . 
     As illustrated in  FIGS. 5, 8A, and 8B , the second lower locking lever  370  is rotatably installed in the front of the first lower locking lever  360  at the lower side of the frame  220  in the vertical direction. The second lower locking lever  370  is disposed such that a portion thereof overlaps with the first lower locking lever  360 , and is installed to be rotated in the reverse direction when pressed by the eccentric rotation portion  331  of the lower operation member  330 . 
     The second lower locking lever  370  includes a rotation shaft  371  rotatably supported in a state of being accommodated in the lower side of the frame  220  and spaced forward from the rotation shaft  361  of the first lower locking lever  360 , a connection portion  372  extending rearward from the rotation shaft  371 , a second lower locking portion  373  extending downward from an end of the connection portion  372  and protruding to the lower side of the frame  220 , and a second contact portion  374  that is pressed by the eccentric rotation portion  331  of the lower operation member  330 . 
     On the rotation shaft  371  of the second lower locking lever  370 , a restoration spring  376  (see  FIG. 5 ) is installed to rotate the second lower locking lever  370  so that the second lower locking portion  373  may protrude downward. Therefore, the second lower locking lever  370  may maintain a state in which the second lower locking portion  373  normally enters the lower guide groove  133  of the lower rail  130 . Also, as illustrated in  FIG. 11 , the second lower locking portion  373  may be caught on a locking groove  137  (an opened-side locking groove) formed at a rear end of the lower guide groove  133  and the plurality of intermediate locking grooves  136  formed in the lower guide groove  133 . 
     When the operation glass  200  is completely opened, the second lower locking lever  370  may be rotated in the locking direction by an elastic restoring force of the restoration spring  376  so that the second lower locking portion  373  enters the locking groove  137  in the rear of the lower guide groove  133  (see  FIG. 11 ) to lock the operation glass  200 . Also, as illustrated in  FIG. 8A , when the lower operation member  330  is rotated in a direction of closing the operation glass  200  by the operation of the operation handle  310 , the second lower locking lever  370  may be rotated in the direction [a direction in which the second lower locking portion  373  ascends] of releasing the locking by the second contact portion  374  being pressed by the eccentric rotation portion  331  of the lower operation member  330 . 
     As illustrated in  FIGS. 7A and 7B , the lower guide groove  133  includes a curved guide  138  to induce the guide pin  224  to an outdoor side so that an outer surface of the operation glass  200  forms the same plane as an outer surface of the fixed glass  100  when the operation glass  200  is completely closed, and the locking groove  135  is formed deeper downward so that the first lower locking portion  363   0 f the first lower locking lever  360  may be caught thereon in a state in which the operation glass  200  is completely closed. As illustrated in  FIGS. 9A and 9B , for the same purpose, the upper guide groove  123  also includes a curved guide portion  126  to induce the guide pin  222  to the outdoor side when the operation glass  200  is completely closed, and the locking groove  125  is formed deeper upward so that the upper locking portion  353   0 f the upper locking lever  350  may be caught thereon in a state in which the operation glass  200  is completely closed. 
     Referring to  FIGS. 11 and 12 , the lower guide groove  133  includes the plurality of intermediate locking grooves  136  formed deeper downward at positions spaced apart from each other in a moving direction of the operation glass  200  so that the first lower locking lever  360  or the second lower locking lever  370  may be caught thereon in a process of opening or closing the operation glass  200 , and the locking groove  137  is formed deeper downward so that the second lower locking portion  373   0 f the second lower locking lever  370  may be caught thereon in a state in which the operation glass  200  is completely opened. 
     Referring to  FIG. 12 , the first lower locking portion  363  includes a first curved portion  363   a  provided on a lower side of a side surface thereof in the closing direction so that the operation glass  200  may move beyond the intermediate locking groove  136  when the operation glass  200  is moved in the closing direction. Also, the second lower locking portion  373  includes a second curved portion  373   a  provided on a lower side of a side surface thereof in the opening direction so that the operation glass  200  may also move beyond the intermediate locking groove  136  when the operation glass  200  is moved in the opening direction. A width of the intermediate locking groove  136  in the opening and closing directions may be equal to or larger than a width of the first lower locking portion  363   0 r the second lower locking portion  373 . 
     Hereinafter, the operation of the flush glass apparatus described above will be described. 
     When the operation handle  310  is rotated in the closing direction to close the operation glass  200 , as illustrated in  FIGS. 7A, 8A, 9A, and 10A , the lower operation member  330  and the upper operation member  320  are rotated together with the operation handle  310  in the closing direction. At this time, the lower operation member  330  rotates the second lower locking lever  370  in the direction of releasing the locking by the eccentric rotation portion  331  pressing the second contact portion  374   0 f the second lower locking lever  370 . Also, because the eccentric rotation portion  331  of the lower operation member  330  is spaced apart from the first contact portion  364   0 f the first lower locking lever  360 , rotation of the first lower locking lever  36 o in the locking direction is allowed. In this case, because the eccentric rotation portion  321  of the upper operation member  320  is also spaced apart from the contact portion  354   0 f the upper locking lever  350 , rotation of the upper locking lever  350  in the locking direction is allowed. 
     When the operation glass  200  is moved in the closing direction in this state, as illustrated in  FIGS. 7B, 8A, 9B, and 10A , the upper locking portion  353   0 f the upper locking lever  350  and the first lower locking portion  363   0 f the first lower locking lever  360  enter and are caught on the locking grooves  125  and  135 , respectively. In this state, the operation glass  200  is not opened as long as the operation handle  310  is not operated. 
     When the operation handle  310  is released after the operation glass  200  is completely closed, the operation handle  310  is returned to its original state by the elastic restoring force of the restoration spring  345 , and as illustrated in  FIGS. 7B and 9B , the upper operation member  320  and the lower operation member  330  are also returned to their original state. 
     Referring to  FIGS. 11 and 12 , when the operation of the operation handle  310  is released in a process of moving the operation glass  200  in the opening or closing direction by operating the operation handle  310 , because the lower operation member  330  is restored to its original state together with the operation handle  310 , the lower operation member  330  may be spaced apart from both the first and second contact portions  364  and  374   0 f the first and second lower locking levers  360  and  370 . Therefore, because the first and second lower locking levers  36 o and  370  are all intended to rotate in the locking direction by the restoring force of the restoration springs  366  and  376 , the first lower locking portion  363   0 r the second lower locking portion  373  may be caught on the intermediate locking groove  136  and stopped. That is, the operation glass  200  may be stopped in a partially open state. 
     When the operation handle  310  is rotated in the opening direction in a state in which the operation glass  200  is closed, as illustrated in  FIGS. 8B and 10B , the eccentric rotation portion  331  of the lower operation member  330  presses the first contact portion  364   0 f the first lower locking lever  360  to rotate the first lower locking lever  360  in the direction of releasing the locking. Also, the eccentric rotation portion  321  of the upper operation member  320  presses the contact portion  354   0 f the upper locking lever  350  to rotate the upper locking lever  350  in the direction of releasing the locking. Therefore, the operation glass  200  may be opened in this state. 
     In the process of opening the operation glass  200 , the lower operation member  330  maintains a state in which the locking of the first lower locking lever  360  is released, and the second lower locking lever  370  is intended to rotate in the locking direction, but the second curved portion  373   a  may move beyond the intermediate locking groove  136 . Therefore, the operation glass  200  may be smoothly opened up to a final opened position as long as the operation of the operation handle  310  is maintained in the process of being opened. In the process of closing the operation glass  200 , the lower operation member  330 , the first lower locking lever  360 , and the second lower locking lever  370  operate as opposed to the above case. Therefore, the operation glass  200  may be smoothly closed up to a final closed position as long as the operation of the operation handle  310  is maintained in the process of being closed. 
     When the operation glass  200  is moved to the completely opened position, the second lower locking lever  370  rotates in the locking direction so that the second lower locking portion  373  is caught on the locking groove  137  located at the rearmost portion of the lower guide groove  133 . The operation glass  200  does not move in the closing direction as long as the operation handle  310  is not operated in this state. Also, the complete opening of the operation glass  200  is maintained. 
     As such, the flush glass apparatus according to the present embodiment may move the operation glass  200  in a desired direction simply by an operation to rotate the operation handle  310  of the locking device  300  in the opening or closing direction, so that the operation glass  200  may be easily opened and closed. 
     Further, the flush glass apparatus according to the present embodiment may provide a beautiful appearance because the operation handle  310  may be restored to its original state from the opened state, the closed state, and a half opened state of the operation glass  200 . 
     Further, in the flush glass apparatus according to the present embodiment, a slight hitting sound is generated as the upper locking portion  353   0 f the upper locking lever  350  and the first lower locking portion  363   0 f the first lower locking lever  360  enter the locking grooves  125  and  135 , respectively, when the operation glass  200  is closed, so that the user may easily recognize whether the operation glass  200  is completely closed. 
     As is apparent from the above, a flush glass apparatus according to an embodiment of the disclosure can move an operation glass in a desired direction simply by an operation to rotate an operation handle in an opening or closing direction, so that the operation glass can be easily opened and closed. 
     Further, the flush glass apparatus according to an embodiment of the disclosure can provide a beautiful appearance because the operation handle is restored to its original state from an opened state, a closed state, and a half opened state of the operation glass. 
     Further, in the flush glass apparatus according to an embodiment of the disclosure, a slight hitting sound is generated as an upper locking portion of an upper locking lever and a first lower locking portion of a first lower locking lever enter locking grooves, respectively, when the operation glass is closed, so that a user can easily recognize whether the operation glass is completely closed.