Patent Publication Number: US-8534343-B2

Title: Security window

Description:
BACKGROUND OF THE INVENTION 
     1. Technical Field 
     The present invention relates, in general, to a folding security window installed on a sliding window frame and, more particularly, to a folding security window capable of easily being locked and unlocked, which is constructed so that height-adjustable movable parts are inserted into upper and lower ends of vertical poles of the security window, and links connecting spaced vertical poles to each other are received in the vertical poles when the security window is folded, and the security window is easily connected to and disconnected from a general window, thus allowing the security window to be rapidly detached from the general window when a disaster or an emergency occurs or the security window is not in use. 
     2. Description of the Related Art 
     Generally, many windows are mounted to outer walls of houses, apartments, shopping centers, and multi-use buildings, and function to replenish indoor air, in addition to providing a view and admitting light. 
     Among various types of windows, a sliding window is most widely used. The sliding window is designed such that a pair of panes is inserted into a rectangular frame, and a locking unit is mounted to opposing ends of the panes. 
     The window may be used as a passage for coupling the interior of a room to the exterior thereof. In the summer season, especially the hot season, the window is opened. However, in this case, a stranger may easily break into a house through the window, so theft and robbery are somewhat common. 
     Recently, because theft using windows is common, an additional security window is usually mounted to the window. A folding security window and a fixed net-type security window are widely used as the security window. The folding security window includes a plurality of vertical poles and links. The net-type security window is designed such that bent pipes are continuously connected to cross each other. 
     However, the conventional security windows are problematic in that they are directly mounted to the front of a window sill, thus marring the appearance of houses and cities. Further, the conventional security windows have a complex structure, so that it is difficult to ensure an outside view, and ventilating efficiency is low. Particularly, since the conventional security windows are directly mounted to a window sill, people cannot rapidly evacuate a room due to the fixed security window when they must escape through the window in the case of an emergency, such as a fire. Thereby, the conventional security windows may harm people. 
     SUMMARY OF THE INVENTION 
     Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a folding security window, which is constructed so that the folding security window is not always mounted to the front of a window, unlike the prior art, but an end of the folding security window is mounted to a window sill, the other end of the security window is connected to the window, a height-adjustable movable part is mounted to a vertical pole of the security window, a connecting means for connecting or disconnecting the security window to or from the window is provided, and the folded security window is not exposed to the outside. 
     When the window is opened or closed, the security window is unfolded or folded, so that the security window does not spoil the appearance of a structure or the city. The movable parts mounted to upper and lower ends of the vertical pole enhance the adaptability and movability of the security window. Since the security window is easily connected to or disconnected from the window, it is possible to rapidly detach the security window from the window when necessary, so that it is very convenient to use. 
     Therefore, the present invention provides a folding security window capable of easily being locked or unlocked, which efficiently performs its original function without hindering ventilation, views, or light admittance. 
     As described above, the present invention provides a folding security window capable of easily being locked and unlocked, which is constructed so that, when a window is opened or closed, the security window is unfolded or folded, so that the security window does not spoil the appearance of a structure or the city. Movable parts mounted to upper and lower ends of the vertical pole enhance the adaptability and movability of the security window. Since the security window is easily connected to or disconnected from the window, it is possible to rapidly detach the security window from the window when necessary, so that it is very convenient to use. 
     Further, the present invention provides a folding security window capable of easily being locked or unlocked, which efficiently performs its original function without hindering ventilation, views, or light admittance. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a perspective view of a security window, according to the present invention; 
         FIG. 2  is a sectional view of the security window, according to the present invention, when the security window is unfolded; 
         FIG. 3  is a sectional view of the security window, according to the present invention, when the security window is folded; 
         FIG. 4  is an enlarged sectional view to show the lower portion of a vertical pole of the security window, according to the present invention; 
         FIG. 5  is a perspective view to show an important part of a connecting unit of the security window, according to the present invention; 
         FIG. 6  is a perspective view to show another embodiment of a connecting unit of the security window, according to the present invention; 
         FIG. 7  is a view to show the state where a window is connected to the security window of this invention and is open; 
         FIG. 8  is a view to show the state where the window is connected to the security window of this invention and is closed; 
         FIG. 9  is a view to show the state where the window is disconnected from the security window of this invention and is open; 
         FIG. 10  is a view to show a further embodiment of a connecting unit for connecting the window to the security window, according to the present invention; 
         FIG. 11  is a perspective view to show the state where the security window of this invention is installed in an additional frame and mounted to a window sill; and 
         FIG. 12  is a view to show another embodiment of a security window, according to the present invention. 
         FIG. 13  is a perspective view illustrating a security window according to a preferred embodiment of the present invention; 
         FIG. 14  is a perspective view illustrating a hook operating member, a hook receiving member and peripheral members of a security window according to an embodiment of the present invention; 
         FIG. 15  is an exploded perspective view illustrating a hook operating member and a hook movement control member of a security window according to an embodiment of the present invention; 
         FIG. 16  is a front view illustrating a length adjustment internal screw member of the security window according to an embodiment of the present invention, and its peripheral portion; 
         FIG. 17  is a front view that describes the coupling between the vertical rods  30  and the link  32  of the security window according to an embodiment of the present invention; 
         FIG. 18  is a front view illustrating an operation state of the security window when an operable window sash is fully opened; 
         FIG. 19  is a front view illustrating an operation state of the security window when an operable window sash is partially opened; 
         FIG. 20  is a front view describes a state where the hook of the hook operating member is unlocked from the hook receiving member of a security window, according to an embodiment of the present invention, when an operable window sash is fully closed; 
         FIG. 21  is a front view describes a state where the hook of the hook operating member is unlocked from the groove of a security window, according to another embodiment of the present invention, when an operable window sash is fully closed; 
         FIG. 22  is a side cross-sectional view another embodiment of a length adjustment internal screw member of the security window according to the present invention; and 
         FIG. 23  is a top plan cross-sectional view illustrating another embodiment of a vertical rod of the security window according to the present invention. 
     
    
    
     DESCRIPTION OF SPECIFIC EMBODIMENTS 
     Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
     Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
       FIG. 1  is a perspective view of a security window, according to the present invention,  FIG. 2  is a sectional view of the security window, according to the present invention, when the security window is unfolded,  FIG. 3  is a sectional view of the security window, according to the present invention, when the security window is folded,  FIG. 4  is an enlarged sectional view to show the lower portion of a vertical pole of the security window, according to the present invention, and  FIG. 5  is a perspective view to show an important part of a connecting unit of the security window, according to the present invention. 
     A known folding security window  10  includes a plurality of vertical poles  1  and  1 ′, and a plurality of links  3  and  3 ′ which connect the vertical poles  1  and  1 ′ to each other. 
     Each of the vertical poles  1  and  1 ′ has the shape of a rectangular pipe. Slots  2  and  2 ′ are formed in both surfaces of each vertical pole  1 ,  1 ′ having the shape of the rectangular pipe. The links  3  and  3 ′ are inserted into the vertical poles  1  and  1 ′ through the slots  2  and  2 ′. 
     Movable parts  5  and  5 ′ having moving rollers  4  and  4 ′ are inserted into the upper and lower ends of the vertical poles  1  and  1 ′. A plurality of support holes  6  and  6 ′ is formed in the movable parts  5  and  5 ′. The movable part  5 ,  5 ′ is secured to the vertical pole  1 ,  1 ′ by inserting a support pin  7  into an associated support hole  6 ,  6 ′. 
     A metal piece  8  is provided on an upper portion of the vertical pole  1 , which is located at one end of the security window. The metal piece  8  is attached to a corresponding connecting magnet  21  which is attached to a window frame  20 . A connecting unit  30  is provided on a lower portion of the vertical pole  1  to connect or disconnect the security window to or from the window frame  20 . 
     The vertical pole  1 ′, which is located at the other end of the security window, is secured to an inner surface of a window sill  100 . Thus, as the window frame  20  is opened or closed, the security window  10  is unfolded or folded. 
     Further, according to another example of a moving and height-adjusting means for the vertical poles  1  and  1 ′, moving bars  42  and  42 ′ are provided on upper and lower portions of the vertical poles  1  and  1 ′ and are spaced apart from each other. The upper and lower ends of the vertical poles  1  and  1 ′ are inserted into the moving bars  42  and  42 ′. 
     A support body  40  having an insertion hole  41  is provided on an upper end of the vertical pole  1 ,  1 ′, so that the moving bar  42  is inserted into the insertion hole  41 . 
     Another insertion hole  41 ′ is formed in the lower end of each of the vertical poles  1  and  1 ′, so that another moving bar  42 ′ is inserted into the insertion hole  41 ′. Thus, the vertical poles  1  and  1 ′ can be easily unfolded or folded along the moving bars  42  and  42 ′. The support body  40  inserted into the upper end of each of the vertical poles  1  and  1 ′ may be freely moved up and down. Thus, by adjusting the height at which the upper moving bar  42  is secured, the height of the security window can be adjusted. 
     Brackets  43  and  43 ′ are provided on ends of the moving bars  42  and  42 ′ to be mounted to the window sill  100 . Thus, the security window is mounted to the window sill  100  using the brackets  43  and  43 ′. 
     The connecting unit  30  includes a support part  31  provided at a predetermined position on the lower end of the vertical bar  1 . A support bar  32  is inserted into the support part  31  in such a way as to be movable up and down. A seating hole  101  is formed at a predetermined position in the window sill  100 . Further, a connecting part  33  is provided on the lower portion of the window frame  20 , and has a connecting hole  34  so that the upper end of the support bar  32  is inserted into the connecting hole  34  of the connecting part  33 . 
     A support magnet  35  secured to the window frame  20  is provided at a predetermined position on the support part  31 . Thus, as the support bar  32  moves up and down, the support part is connected to or disconnected from the connecting part  33 . Thereby, the security window is connected to or disconnected from a window. 
     The construction of a connecting unit according to another embodiment of the present invention will be described below. A connecting part  33  having a connecting hole  34  protrudes from the lower portion of the vertical pole  1  which is located at one end of the security window. A conventional locking unit  37  having a rotary elevating part  36  is mounted to the lower portion of the window frame  20 . Thus, as the rotary elevating part  36  moves up and down, the locking unit is connected to or disconnected from the connecting part  33 . Thereby, the security window is connected to or disconnected from the window. 
     Further, an additional connecting pole  39  having a plurality of rotary hooks  38  may be mounted to one end of the window frame  20 . Hook holes  38 ′ are formed in the vertical pole  1  at positions corresponding to the rotary hooks  38 . Thus, by adjusting the rotary hooks  38 , the security window is connected to or disconnected from the window. 
     The security window  10  may be directly installed in the window sill  100  so that the vertical poles  1  and  1 ′ provided on both ends of the security window  10  are directly secured to the window frame  20  and the window sill  100 . In such a state, the security window  10  is folded or unfolded. 
     Further, an additional security window frame  22  may be formed. In this case, a vertical pole  1 ′ provided on one end of the security window  10  is secured in the security window frame  22 . In such a state, the security window frame  22  is mounted to one end of the window sill  100 . A vertical pole  1  provided on the other end of the security window  10  installed in the security window frame  22  is detachably connected to one end of the window frame  20  using the connecting unit  30 . 
     The operation of the folding security window capable of easily being locked and unlocked, according to the present invention, will be described in detail with reference to the accompanying drawings. 
     As shown in the drawings, the security window of this invention includes a plurality of vertical poles  1  and  1 ′, and a plurality of folding links  3  and  3 ′ which connect the vertical poles  1  and  1 ′ to each other. As the vertical poles  1  and  1 ′ are spaced apart from each other, the links  3  and  3 ′ unfold, so that the security window is opened. Conversely, when the vertical poles  1  and  1 ′ approach each other, the links  3  and  3 ′ are rotated to be vertical, so that the security window  10  folds. 
     In this case, the vertical pole  1  provided at one end of the security window is directly connected to one end of the window frame  20 , and the vertical pole  1 ′ provided at the other end of the security window is secured to the inner surface of the window sill  100 . Thereby, the security window  10  unfolds or folds as the window frame  20  is opened or closed. 
     Unlike the prior art, the security window is not secured to the entire surface of the window frame, and is unfolded when the window is opened. 
     Particularly, when the security window  10  is folded, the links  3  and  3 ′ are not exposed to the outside, but are completely inserted into the vertical poles  1  and  1 ′ so that they are not observed from the exterior. Each of the vertical poles  1  and  1 ′ has the shape of a rectangular pipe. The slots  2  and  2 ′ are formed in both sides of each vertical pole  1 ,  1 ′ having the shape of the rectangular pipe, and ends of the links  3  and  3 ′ are inserted into the vertical poles  1  and  1 ′ through the slots  2  and  2 ′. That is, the links  3  and  3 ′ are rotated and folded to be inserted into the vertical poles  1  and  1 ′. 
     Since the security window must be frequently unfolded or folded when the window is opened or closed, the movable parts  5  and  5 ′ are mounted to the upper and lower ends of the vertical poles  1  and  1 ′, thus allowing the security window to more smoothly move. 
     The movable parts  5  and  5 ′ have on the lower ends thereof the moving rollers  4  and  4 ′. Since the moving rollers  4  and  4 ′ rotate and move along a rail (not shown), the sliding motion of the vertical poles  1  and  1 ′ is very easy. The height of each of the moving parts  5  and  5 ′ is adjustable from the end of each of the vertical poles  1  and  1 ′. Thus, the security window of this invention is easily adapted to various sizes of windows. 
     A plurality of support holes  6  and  6 ′ is laterally formed in the movable parts  5  and  5 ′ inserted into ends of the vertical poles  1  and  1 ′ each having the shape of the rectangular pipe. By inserting the support pin  7  into an associated support hole, the movable parts  5  and  5 ′ are secured to the vertical poles  1  and  1 ′. According to the height of the support hole  6 ,  6 ′ into which the support pin  7  is inserted so as to support the movable part  5 ,  5 ′, the overall height of the security window  10  is changed. Thus, even if the height of a window is slightly different from a preset height, it is possible to apply the security window  10  to various windows by adjusting the height of the movable part  5 ,  5 ′ without manufacturing the vertical poles  1  and  1 ′ again. 
     Further, the vertical pole  1  provided at one end of the security window is secured to one end of the window frame  20 , so that the security window folds or unfolds as the window frame  20  is closed or opened. The metal piece  8  is provided on the upper end of the vertical pole  1 , and the connecting magnet  21  is provided on the window frame  20  at a position corresponding to the metal piece  8 . Thereby, the metal piece  8  is attached to the connecting magnet  21  by an attractive force. 
     The connecting unit  30  is provided on the lower end of the vertical pole  1  to connect the security window to the window. Thus, as the window frame  20  is opened or closed, the security window  10  is unfolded or folded together with the window frame. 
     Particularly, when the security window  10  is not in use or people must escape through a window because of an emergency, such as a fire, the security window  10  may be separated from the window frame  20 . The separated security window  10  is folded and secured to one side, so that it is possible to completely open the window. 
     To this end, the connecting unit  30  is detached from the window. As shown in  FIG. 6 , the connecting unit  30  includes the support part  31  mounted to one end of the vertical pole  1 . The support bar  32  is inserted into the support part  31  in such a way as to move up and down. The connecting part  33  having the connecting hole  34  is provided above the support bar  32 , and is secured to the window frame  20 . When the support bar  32  moves up to be inserted into the connecting hole  34  of the connecting part  33 , the security window  10  is connected to the window frame  20 . Conversely, when the support bar  32  moves down to be removed from the connecting hole  34 , the security window  10  is separated from the window frame  20 . 
     In this case, the support bar  32  is freely movable up and down without an additional support means. When the support bar  32  moves along the window sill  100 , the length of the support bar  32  is adjusted so that the support bar  32  is inserted into the connecting hole  34  of the connecting part  33 . Meanwhile, when the support bar  32  moves to one side of the window sill  100  and is positioned in the seating hole  100 ′ formed in the window sill  100 , the support bar  32  moves down to be removed from the connecting hole  34 . Thereby, the security window  10  is separated from the window frame  20 . 
     Even when the security window  10  is folded, there are cases where the support bar  32  must not move down, in order to maintain connection between the security window and the window. To this end, the support magnet  35  is provided on one side of the support part  31  to be secured to the window frame  20 , so that the support magnet  35  supports the support bar  32  using a predetermined attractive force. Thus, only when the support bar  32  moves down, the connecting force of the support bar  32  is released so that the security window  10  is separated from the window frame  20 . 
     The connecting unit  30  may comprise the conventional locking unit  37 , as shown in  FIG. 6 . The conventional locking unit  37  has the rotary elevating part  36  therein. The locking unit  37  is mounted to the window frame  20 , and the connecting part  33  having the connecting hole  34  is provided above the rotary elevating part  36  and is secured to one side of the vertical pole  1 . Thereby, when the rotary elevating part  36  is forced to move up, the rotary elevating part  36  is connected to the connecting part  33 , so that the security window  10  is connected to the window frame  20 . Conversely, when the rotary elevating part  36  moves down, the security window  10  is separated from the window frame  20 . 
     Further, the connecting unit  30  may be provided on the additional connecting pole  39 , as shown in  FIG. 10 . A plurality of rotary hooks  38  protrudes from the connecting pole  39 , and a plurality of hook holes  38 ′ is formed in the vertical pole  1  at positions corresponding to the rotary hooks  38 . When the rotary hooks  38  of the connecting pole  39  rotate to be inserted into the hook holes  38 ′ of the vertical pole  1 , the security window  10  is connected to the window frame  20 . Meanwhile, when the rotary hooks  38  rotate upward to be removed from the hook holes  38 ′, the security window  10  is removed from the window frame  20 . 
     The operation of the security window according to the present invention will be described with reference to  FIGS. 7 to 9 . When the security window  10  is connected to the window frame  20 , the security window  10  is unfolded or folded as the window is opened or closed, as shown in  FIG. 7 . When the connecting unit  30  of  FIG. 8  is released and thereafter the window is opened, the security window  10  maintains a folding state and only the window is opened, as shown in  FIG. 9 . Thus, it is more convenient to use the security window. 
     Particularly, a storage recess (not shown) may be formed in one side of the window frame  20  to receive the folded security window  10 . In this case, the folded security window  10  is not exposed to the outside, thus providing a good appearance without affecting the original functions of the window, such as ventilation, a view, or light admittance. 
     Further, as shown in  FIG. 11 , the additional rectangular security window frame  22  may be formed. After one vertical pole  1 ′ of the security window  10  is secured to one end of the rectangular security window frame  22 , the security window frame  22  is mounted to the window sill  100  which has been already installed, and another vertical pole  1  is connected to the window frame  20 . Such a construction allows the security window  10  to be more easily installed, and allows the window to be completely closed when the security window  10  is separated from the window frame  20 . 
     Further, as shown in  FIG. 12 , the moving bars  42  and  42 ′ are provided on the upper and lower ends of the vertical poles  1  and  1 ′ of the security window  10  in such a way as to be spaced apart from each other. The upper and lower ends of the vertical poles  1  and  1 ′ are inserted into the moving bars  42  and  42 ′. 
     In this case, the movable support body  40  is inserted into the upper end of each of the vertical poles  1  and  1 ′. When the moving bar  42  is inserted into the insertion holes  41  in the support bodies  40 , the support bodies  40  inserted into the vertical poles  1  are simultaneously extended from or retracted into the vertical poles by the vertical motion of the moving bar  42 . In this way, the overall height of the security window  10  is adjustable. 
     Another insertion hole  41 ′ is directly formed in the lower end of each of the vertical poles  1  and  1 ′. Thus, when the moving bar  42 ′ disposed at a lower position is inserted into the insertion holes  41 ′, the vertical poles  1  and  1 ′ are easily unfolded or folded along the moving bar  42 ′. 
     Such a security window  10  is mounted to a side surface of the window sill  100  using the brackets  43  and  43 ′ provided at ends of the moving bars  42  and  42 ′. Afterwards, one vertical pole  1  is connected to the window frame  20  via the connecting unit  30 , as in the above-mentioned embodiments. Another vertical pole  1 ′ is secured to a vertical side surface of the window sill  100 . Thus, as the window frame  20  is opened or closed, the security window  10  is easily unfolded or folded. 
     Therefore, the security window of the present invention is characterized in that it is very efficient, and is universally usable. 
       FIG. 13  is a perspective view illustrating a security window according to a preferred embodiment of the present invention.  FIG. 18  is a front view illustrating an operation state of the security window when a window sash is fully opened. 
     As shown in  FIGS. 13 and 18 , the security window includes a upper guide rod  210  whose one end is fixed to a head-jamb of the window frame  201 , a lower guide rod  220  whose one end is fixed to a sill of the window frame  201 , a plurality of vertical rods  230  both ends of which the lower and upper guide rods  210  and  220  extend through, respectively, links  232  for joining the vertical rods  230  to each other, a hook operating member  240  and a hook movement control member  246  installed in one of the vertical rods  230 , and a hooking receiving member  250  installed in a stile  202  of the window sash that is operable, i.e., can be opened or closed. 
     The upper guide rod  210  is configured to include a horizontal body  211  shaped as a relatively long rod and a vertical body  212  formed as one end of the horizontal body  211  is perpendicularly bent with respect to the horizontal body  211 . The vertical body  212  forms an external thread on its outer surface. The other end of the horizontal body  211  is fixed to the side-jamb of the window frame  201 . The vertical body  212  is joined with a length adjustment external screw member  216 , whose outer surface forms an external thread, via a length adjustment internal screw member  217  whose inner wall forms an internal thread. The length adjustment external screw member  216  is screwed into and coupled to a bracket  215  that is fixed to the lower surface of the head-jamb of the window frame  201 . The horizontal body  211  also forms a groove  214  for allowing the entry of a hook movement control member  246  at a position near the other end thereof. 
     The lower guide rod  220  is shaped as a relatively long rod. One end of the lower guide rod  220  is coupled to a fix bracket  222  that is fixed on the surface of the sill of the window frame  201  by screws, and the other end is fixed to the side jamb of the window frame  201 . The fix bracket  222  is shaped as the letter ‘L’. A through-hole is formed at a position near the upper end portion of the L-shaped fix bracket  222  and allows the entry of the one end of the lower guide rod  220 . The one end of the lower guide rod  220  is then coupled to the through hole of the fix bracket  222 . 
     The plurality of vertical rods  230  are each shaped as a rectangular hollow rod. The vertical rods  230  are coupled to each other by links and also adjust their spacing via the same. The vertical rods  230  are arranged parallel to the side-jamb. The vertical rods  230  are coupled to the upper guide rod  210  as their upper end portions allow the entry of the upper guide rod  210 . Likewise, the vertical rods  230  are also coupled to the lower guide rod  220  as their lower end portions allow the entry of the lower guide rod  220 . It is assumed that one of the vertical rods  230  is farthest from the side-jamb to which the upper and lower rods  210  and  220  are fixed, called the farthest vertical rod  230   a  (or first vertical rod), and another of the vertical rods  230  is closest to the side-jamb, called the closest vertical rod  230   b  (or second vertical rod). The farthest vertical rod  230   a  is coupled with a hook operating member  240  and a hook movement control member  246 . The closet vertical rod  230   b  is closest to and fixed on the surface of the side-jamb of the window frame  201  via fixing members (not shown). The closet vertical rod  230   b  forms coupling through-holes (not shown) at both ends thereof to couple with the upper and lower guide rods  210  and  220 , respectively. That is, the other end of the horizontal body  211  of the upper guide rod  210  is extended through the coupling through-hole for the upper guide rod  210  and then fixed to the side-jamb of the window frame  201 . Likewise, the other end of the lower guide rod  220  is extended through the coupling through-hole for the lower guide rod  220  and then fixed to the side-jamb of the window frame  201 . 
     In operation, when the farthest vertical rod  230   a  is moved far from the side-jamb of the window frame  201 , the remaining vertical rods  230 , other than the closest vertical rod  230   b  fixed to the side-jamb of the window frame  201 , are moved in the direction of the movement of the farthest vertical rod  230   a , being spaced with a certain distance from each other via the links  232 . 
       FIG. 14  is a perspective view illustrating a hook operating member, a hook receiving member and peripheral members of a security window according to an embodiment of the present invention.  FIG. 15  is an exploded perspective view illustrating a hook operating member and a hook movement control member of a security window according to an embodiment of the present invention. 
     As shown in  FIGS. 14 and 15 , the farthest vertical rod  230   a  forms an opening portion  231  as a certain area is cut out from its side surface. A hook movement control member  246  is placed within the farthest vertical rod  230   a , exposed through the opening portion  231 . The hook movement control member  246  is integrally coupled to a hook operating member  240 , placed outside the opening portion  231 , via a fixing member  244 . 
     The hook operating member  240  is shaped as a plate whose width is greater than that of the opening portion  231 . The hook operating member  240  is formed in such a way that a handle  241  is formed as the lower end portion of the hook operating member  240  is bent and protruded outwardly and a hook fixing part  242  is protruded in the same direction of the handle  241  at the upper portion of the hook operating member  240 . The hook fixing part  242  forms a hook  243  shaped as a pin, expended downward from the lower side thereof. 
     The hook movement control member  246  is shaped as a plate of a certain thickness and inserted into the farthest vertical rod  230   a . The hook movement control member  246  forms an inserting protrusion  247  at its upper portion, where the inserting protrusion  247  has a relatively narrow width and is inserted into the groove  214 . 
     The hook operating member  240  and the hook movement control member  246  are placed outside and inside the opening portion  231  of the farthest vertical rod  230   a , respectively, and integrally coupled to each other. Therefore, the hook movement control member  246  is supported by the lower end of the opening portion  231 , so that it cannot be moved in the lower direction against the opening portion  231 . 
     The hook receiving member  250  forms a hook receiving through-hole  251  extended through in an upward and downward direction. The hook receiving member  250  is fixed to the stile of an operable window sash via fixing members  252 . 
     In operation, when the farthest vertical rod  230   a  approaches the stile of the window sash, to which the hook receiving member  250  is fixed, in a state where the handle  241  of the hook operating member  240  is lifted up, and then the hook operating member  240  is lowered, the hook  243  of the hook operating member  240  is inserted into the hook receiving through-hole  251  of the hook receiving member  250  and simultaneously the farthest vertical rod  230   a  is coupled to the stile of the window sash to which the hook receiving member  250  is fixed. If the hook operating member  240  is lifted up and then the farthest vertical rod  230   a  is removed from the stile of the window sash to which the hook receiving member  250  is fixed, the farthest vertical rod  230   a  is separated from the stile of the window sash to which the hook receiving member  250  is fixed. 
       FIG. 16  is a front view illustrating a length adjustment internal screw member of the security window according to an embodiment of the present invention, and its peripheral portion. 
     As shown in  FIG. 16 , the vertical body  212  of the upper guide rod  210  is coupled to the length adjustment external screw member  216 , via the length adjustment internal screw member  217 , where the length adjustment external screw member  216  is screwed into the bracket  215  fixed to the head-jamb of the window frame  201 . The length adjustment internal screw member  217  is rotated to adjust the distance between the vertical body  212  and the length adjustment external screw member  216 . Alternatively, the length adjustment external screw member  216  is rotated with respect to the bracket  215 , i.e., screwed out or into the bracket  215 , to thereby adjust the distance between the bracket  215  and the vertical body  212 . It should be understood that the head-jamb of the window frame  201  may form a hole  219 , so that the length adjustment external screw member  216  can be further screwed into the hole  219 . 
     Since the length adjustment internal screw member  217  and the length adjustment external screw member  216  of the security window according to the present invention can adjust the distance between the upper guide rod  210  and the lower surface of the head-jamb, the security window can be installed in the window frames of various heights, where it has the same vertical rods  230 . For example, as shown in  FIG. 16 , if the security window is installed in the window frame of a relatively large height, the length adjustment internal screw member  217  is rotated to increase the distance between the length adjustment external screw member  216  and the vertical body  212  and then the length adjustment external screw member  216  is further rotated to increase the length of the screw member  216  from the bracket  215 , thereby increasing the distance between the bracket  215  and the upper guide rod  210 . After that, the security window is installed in the large sized window frame. On the contrary, as shown in  FIG. 16A , if the security window is installed in the window frame of relatively small height, it can be achieved by performing the reverse processes of adjusting the distance for the relatively large sized window frame. 
     The length adjustment internal screw member  217  is shaped as a nut consisting of two threaded parts, one with a left-hand thread and the other with a right-hand thread, which is called a turnbuckle. When the length adjustment internal screw member  217  is rotated, the bolts, i.e., the length adjustment external screw member  216  and the vertical body  212 , are screwed into or out of the length adjustment internal screw member  217 , simultaneously, according to the rotation direction of the length screw member  217 , so that the distance between the length adjustment external screw member  216  and the vertical body  212  can be reduced or increased. 
     Alternatively, the length adjustment internal screw member  217  can be modified to a length adjustment member  317  as shown in  FIG. 22 . That is, the length adjustment  317  is configured to include a nut  313  whose internal wall forms a thread and a bracket  312  coupled to one end of the nut  313  for allowing the nut to be rotated in the initial position. It should be understood that the length adjustment member  317  may be implemented with a pan nut. In use of the length adjustment member  317 , the bracket  312  is fixed to a hole formed in the window frame and then the vertical body  212  of the upper guide rod  210  is screwed into the nut  313 . After that, when the nut  313  is rotated with respect to the bracket  312 , the vertical body  212  is screwed into or out of the nut  313  to thereby adjust the height of the upper guide rod  210 . 
     Although it is not shown in the drawings, the security window according to the present invention can be implemented in such a way that at least one of the upper and lower ends of the vertical rod  230  is configured to be extendable and thus the length of the vertical rod  230  can be properly adjusted according to the size of the window frame  201 . For example, the vertical rod  230  can be implemented in such a way that one of its upper and lower ends is collapsible so that its length can be increased or decreased, and an extension bar (not shown) can be inserted into the vertical rod  230  to fix the increased or decreased length of the vertical rod  230 . 
       FIG. 17  is a front view that describes the coupling between the vertical rods  230  and the link  232  of the security window according to an embodiment of the present invention. 
     A plurality of vertical rods  230  are connected to each other via links  232 . For example, as shown in  FIG. 17 , two vertical rods are connected to each other via a link  232  in such a way that one end  232   a  of the link  232  is pivotally coupled to a position of one vertical rod  230  and the other end  232   b  of the link  232  is slidably connected into another vertical rod adjacent to the vertical rod  230 , which is a well known coupling structure. 
       FIG. 18  is a front view illustrating an operation state of the security window when an operable window sash is fully opened.  FIG. 19  is a front view illustrating an operation state of the security window when an operable window sash is partially opened. 
     As shown in  FIG. 18 , the farthest vertical rod  230   a  is coupled to the stile  202  of the operable window sash as the hook  243  of the hook operating member  240  is coupled to the hook receiving member  250 . When the operable window sash is fully opened, the upper guide rod  210  is across extended through the hollow space above the inserting protrusion  247  of the hook movement control member  246  located in the farthest vertical rod  230   a . That is, the upper guide rod  210  interrupts the hollow space, so that the hook movement control member  246  cannot be lifted up. In that case, the hook  243  cannot be removed from the hook receiving member  250 . Therefore, the farthest vertical rod  230   a  cannot be separated from the stile  202  of the operable window sash, so that the security window cannot be removed from the stile  202 . 
     As shown in  FIG. 19 , when the operable window sash is partially opened or closed, the upper guide rod  210  is across extended through the hollow space above the inserting protrusion  247  of the hook movement control member  246  located in the farthest vertical rod  230   a . That is, the upper guide rod  210  still interrupts the hollow space, so that the hook movement control member  246  cannot be lifted up. Therefore, the security window cannot be removed from the stile  202  of the operable window sash. 
       FIG. 20  is a front view describes a state where the hook of the hook operating member is unlocked from the hook receiving member of a security window, according to an embodiment of the present invention, when an operable window sash is fully closed. 
     As shown in  FIG. 20 , when the operable window sash is fully closed so that a plurality of vertical rods  230  are also fully collapsed, the farthest vertical rod  230   a  is located right beneath the groove  214  of the upper guide rod  210 . That is, when the plurality of vertical rods  230  are all collapsed in the direction to close the window sash, the groove  214  is formed so that it can be located right above the position where the farthest vertical rod  230   a  is located. 
     Since the farthest vertical rod  230   a  is located right beneath the groove  214  of the upper guide rod  210 , the inserting protrusion  247  of the hook movement control member  246  within the farthest vertical rod  230   a  can enter the groove  214  of the upper guide rod  210 . In this state, when the handle  241  of the hook operating member  240  is lifted up, the hook  243  of the hook operating member  240  is removed from the hook receiving through-hole  251  of the hook receiving member  252 . After that, when the operable window sash is moved far from the side-jamb, it is separated from the farthest vertical rod  230   a  of the security window. 
     As describe above in  FIGS. 18 to 20 , the security window according to the present invention can be separated from the stile of the window sash only if the window sash is fully closed and simultaneously all the vertical rods  230  are fully collapsed. This means also that the security window cannot be separated from the window sash from the outside as long as this condition is not achieved. That is, the security window can be separated from the window sash only from the inside. 
     Meanwhile, if the security window is installed in the window sash in a state where the window sash is not fully closed, the farthest vertical rod  230   a  needs to be located right beneath the groove  214  of the upper guide rod  210 . This means that installing the security window in the window sash can also be performed only inside the window sash, or indoors. 
       FIG. 21  is a front view describes a state where the hook of the hook operating member is unlocked from the groove of a security window, according to another embodiment of the present invention, when an operable window sash is fully closed. 
     As shown in  FIG. 21 , the security window another embodiment of the present invention is similar to the embodiment shown in  FIGS. 13 to 20  in that it includes a hook operating member  240 , a hook movement control member  246  and a hook receiving member  250  but differs therefrom in that it does not include upper and lower guide rods. Since another embodiment does not include the upper guide rod, a groove  314  corresponding to the groove  214  of the upper guide rod  210  shown in  FIGS. 13 to 20  is formed in the head-jamb of the window frame  201 . 
     In the security window according to another embodiment of the present invention, the vertical rods are moved along the window frame  201  without the use of an additional movement guide member. 
     Therefore, the hook movement control member  246  is installed in the window frame  201 . The window frame  201  also forms a groove  314 , so that the hook movement control member  246  can be lifted up into the groove  314 . 
     In that case, the remaining vertical rods, other than the farthest vertical rod  230   a  to which the hook movement control member  246  is installed, may further include a member, so that they can smoothly move along the window frame  201 . Example of the member is a roller (not shown), where the roller can be installed at the end of the vertical rod. 
       FIG. 23  is a top plan cross-sectional view illustrating another embodiment of a vertical rod of the security window according to the present invention. 
     As shown in  FIG. 23 , the vertical rod  330  can be implemented in such a way that an internal member  332  and an external member  334 , shaped as the Korean letter ‘ ’ read as ‘DiGeut’, are coupled to each other. The internal member  332  is fitted into the inside of the external member  334 . The internal member  332  forms a lengthwise protrusion  333  on outer surfaces of both side walls, respectively. The external member  334  forms a lengthwise groove  335  on inner surfaces of both side walls, corresponding to the lengthwise protrusion  333  of the internal member  332 . Therefore, when the internal member  332  is inserted into the inside of the external member  334 , the lengthwise protrusions  333  of the internal member  332  are fitted into the lengthwise grooves  335  of the external member  334 . When the internal member  332  is coupled to the external member  334 , the vertical rod  330  is formed shaped as a rectangular rod whose inside is hollow. 
     Although the upper guide rod and the lower guide rod, guiding the vertical rods, are implemented as a rod structure in an embodiment of the present invention, it should be understood that the present invention is not limited to the embodiment. For example, the guide rod can be implemented as various shapes only if it can guide the vertical rods and allow the entry of the hook movement control member at a particular position. An example of the guide rod may be a rail. 
     Since the security window is implemented to install the hook movement control member within the vertical rod, the hook movement control member cannot be cut from the outside. That is, the security window can prevent the hook movement control member from being cut from the outside. 
     The security window is coupled to the operable window sash and the other half of the window sash is fixed to the window frame so that it cannot be opened. 
     As described above, the security window according to the present invention can be collapsed or expanded simultaneously as the window sash is opened or closed, and is almost invisible when the window sash is closed, so that people cannot view it, which does not affect the appearance of the window. 
     The security window can be installed in various sizes of window frames by adjusting its size using its height control member, which provides cost-effective window security. 
     The security window can be protected against external attempts of cutting or damage via the hook movement control member installed into the vertical rod, where the hook movement control member is joined with the window sash. 
     Although exemplary embodiments of the present invention have been described in detail hereinabove, it should be understood that many variations and modifications of the basic inventive concept herein described, which may appear to those skilled in the art, will still fall within the spirit and scope of the exemplary embodiments of the present invention as defined in the appended claims.