JP2003239658A - Crime prevention structure for sash window - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a draft sash equipped with a locking function. <P>SOLUTION: Slidable inside and outside sashes 2 and 3 are arranged in a window frame 1, and the draft sash 8 is placed between both inside and outside sashes 2 and 3. A fitting body 13 retractable in the inside face 9 of the outside sash 3 is provided to at least one stile 3a in the outside frame of the outside wash 3 and, at the same time, a socket 17a corresponding to the fitting body 13 is provided to the outside 16a in at least the other stile 8a in the outside frame of the draft sash 8. When the front end 14 of the fitting body 13 is projected from the inside 9 of the outside sash 3 to fit into the socket 17a of the draft sash 8, the outside sash 3 is combined with the draft sash 8, and the draft sash 8 is not opened from the outdoor side. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sash window crime prevention structure.

[0002]

2. Description of the Related Art As shown in FIG. 8, an opening of a house, a building or the like can be opened and closed by two sashes 2 and 3 arranged on a window frame 1 so as to be slid. A crescent 5 is provided on the outer end surface 4 of the vertical frame 2a of the inner sash 2, and a crescent receiver 7 for the crescent 5 is provided on the inner end surface 6 of the vertical frame 3a of the outer sash 3. Then, on the outside of the outer sash 3 in the window frame 1, a gap when either one of the sashes 2 and 3 is opened is closed to prevent the entry of insects into the room and to ventilate the door. The ventilation sash 8 is generally provided so as to be slidable right and left.

[0003]

However, since the ventilation sash does not have a locking function, it can be easily opened from the outside, which is unwarranted.

[0004]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned prior art, and in view of the problem that the ventilation sash does not have a locking function and does not have a crime prevention effect, it is provided between sliding sashes slidably provided on the window frame. , A slidable ventilation sash is provided, and a fitting is provided on the vertical frame at least in the center (one side) of the window frame of the outer sash, while on the other hand, at least the center of the window frame of the ventilation sash is arranged so as to be pulled over the outer sash. A receiving hole at the tip of the fitting body is formed on the outer surface of the vertical frame of the portion (on the other side). Then, when the tip of the fitting body is allowed to project and retract from the inner side surface of the outer sash and the fitting body is projected from the inner side surface of the outer sash, the tip of the fitting body fits into the receiving hole of the ventilation sash to form the sash and the ventilation sash. The above-mentioned problems are solved by making it possible to lock the ventilation sash so that the ventilation sash cannot be opened from the outside.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The sash window according to the present invention is composed of a window frame 1, inner and outer sashes 2 and 3 and a ventilation sash 8 having substantially the same configuration as the conventional example shown in FIG. 8, but as shown in FIG. There are some differences in shape and the like, and the first and second embodiments will be described below.

[First Embodiment] As shown in FIG. 1, a ventilation sash 8 is provided between slidable inner and outer sashes 2, 3.

[0007] When closed, the inner and outer sashes 2 and 3 overlapping the front and rear
And the clearance between the vertical frames 2a, 3a, 8a of the ventilation sash 8 is the minimum required to slide the inner and outer sashes 2, 3 and the ventilation sash 8 not only for crime prevention but also for preventing wind and rain from entering. The gap is set to the limit.

The outer frames of the inner and outer sashes 2 and 3 are hollow, and the vertical frame 3a on one side of the outer frame of the outer sash 3 is a ventilation sash 8
An opening 10 is provided on the inner side surface 9 facing the vertical frame 8a, and a shaft insertion hole 11 is provided on the inner end surface 6 (glass fitting surface).

As shown in FIGS. 2 (a) and 2 (b), the rotary shaft 12a of the L-shaped lever 12 is inserted into the shaft insertion hole 11 of the outer sash 3 and is arranged in the hollow portion of the vertical frame 3a. Fitting body 13 that is formed in a substantially semi-circular shape at the tip of the rotating shaft 12a and has a groove formed on the outer peripheral portion.
Is fixed vertically. Then, the fitting body 13 is normally and reversely rotated by the rotating shaft 12a, and as shown in FIGS. 2 and 3, the fitting portion 14 of the fitting body 13 is housed in the vertical frame 3a at the time of unlocking and is fitted at the time of locking. The portion 14 is made to project from the vertical frame 3a.

The operating portion 12b of the lever 12 is connected to the inner end surface 6 of the vertical frame 3a.
The operating portion 12b is provided so as not to interfere with the vertical frame 8a when raised, and the inner sash 2 is placed inside the outer sash 3 as shown in FIGS. 4 (a) and 4 (b). The length of the operating portion 12b is set so that it comes into contact with the outer surface 15 of the inner sash 2 when the operating portion 12b is tilted in this state. In the present embodiment, when locking the fitting portion 14 from the opening 10,
The operating part 12b is tilted, but the operating part
12b may be changed by approximately 180 ° so that the operating portion 12b is raised when locking.

The ventilation sash 8 is constructed so that it can be removed from the rails only at a substantially central portion of the window frame 1, and is arranged at least in the central portion of the window frame 1 among the left and right vertical frames 8a, 8b in the outer frame. Vertically elongated groove-shaped receiving holes 17, 17a are provided in the inner and outer surfaces 16, 16a of the lateral vertical frame 8a. Also, the receiving hole on the outer surface 16a
A crescent receiver 18 is provided on 17a, and the fitting portion 14 of the fitting body 13 is hooked on the crescent receiver 18 when locked.

Further, a ventilation member 19 is attached inside the outer frame of the ventilation sash 8. In the illustrated example, the ventilation member 19 is composed of a plurality of vertical lattices 20, 20a. They are arranged side by side in the horizontal direction, and their upper and lower ends are fixed to the outer frame, and the intervals between the vertical gratings 20, 20a ... The ventilation structure of the ventilation sash 8 is not limited to the vertical lattices 20, 20a, but may be a horizontal lattice, a double lattice lattice, or a lattice lattice in which diagonal lattices are assembled. Further, not only the lattice but also a plurality of inclined plates are provided. It may be a shutter, chain, steel wire, or simply a perforated plate,
You may form a painting, a modeling, or a design with a component or a hole.

The ventilation member 19 is preferably fixed to the outer frame of the ventilation sash 8 from the inside by bolts or the like so as not to come off from the outer frame of the ventilation sash 8. The ventilation member 19 is made of metal. Not only that, it may be made of synthetic resin such as wood or acrylic. Further, an insect net 21 made of metal or synthetic fiber is provided on either one of the front and back surfaces of the ventilation sash 8, and the insect net 21 is detachably attached to the outer frame of the ventilation sash 8.

In the inner sash 2, of the left and right vertical frames 2a and 2b of the outer frame, a lock 22 is provided on at least the other vertical frame 2a arranged at the center of the window frame 1 and is tightened. Lock 22
It has a fitting body (23) that can be retracted from the outer surface (15) of the inner sash (2).

Further, in the above embodiment, in the outer sash 3, the fitting 13 is provided on the vertical frame 3a on one side arranged in the central portion of the window frame 1, while the outer frame of the ventilation sash 8 is provided. Although the receiving hole 17a is provided on the outer surface 16a of the vertical frame 8b on the other side, the vertical frames 3a, 3b on one side and the other side of the outer sash 3 are also provided in addition to the illustrated example.
The fitting body 13 is provided on one or both of the
Similar to the embodiment, the vertical frames 3a, 3b are protruded and retracted from the inner side surface 9, and on the other hand, one or both of the vertical frames 8a, 8b on one side and the other side of the outer frame of the ventilation sash 8 are provided outside Receiving hole 17 on side 16a
A may be provided.

[Second Embodiment] As one illustrated example showing the above, in the second embodiment, the shapes of the inner and outer sashes 2 and 3 are the same as those in the illustrated example, and a vertical frame on one side of the outer sash 3 is provided. 3a mating body
Although 13 is provided, a part of the ventilation sash 8 is different from that of the first embodiment, and as shown in FIG.
Not only on the vertical frame 8a on the other side but also on the inner and outer surfaces 16, 16a of the vertical frame 8b on one side, the fitting body 13 of the outer sash 3 and the inner sash 2 are
The receiving holes 17 and 17a for the lock 22 are recessed.

Further, as shown in FIG. 7 (a), a ventilation sash 8 is provided.
An opening / closing window 24 in which the vertical lattices 20, 20a ... And the insect net 21 which overlap with the operating range of the lever 12 of the outer sash 3 arranged outside the open window 24 are separate bodies, and can be opened and closed by the attachment means 25. For example, as shown in FIG. 7 (b), the attachment means 25 is provided with a hinge on the outer frame of the ventilation sash 8, and the vertical lattices 20, 20a ... And insect repellent nets 21 of the portion of the hinge that overlaps the operating range of the lever 12. May be opened and closed, or, though not shown, the above-mentioned portion may be detachable with Velcro (registered trademark) or a magnet.

Although the lever 12 is directly connected to the fitting body 13 in the first and second embodiments, it may be interlocked via a transmission means such as a gear.

Next, a method of using the sash window according to the present invention will be described. First, the common usage in the first and second embodiments will be described. [When Locking Ventilation Sash 8] 1-1) In the outer sash 3, the vertical frame 3a provided with the fitting body 13 is arranged in the central portion of the window frame 1, and the ventilation sash 8 is pulled in contrast to the outer sash 3. And arrange the inner sash 2 on the ventilation sash 8. 1-2) As shown in FIGS. 3 (a) and 3 (b), when the operating portion 12b of the unlocked lever 12 is tilted, the fitting portion 14 projects from the opening 10 of the vertical frame 3a to fit Portion 14 is a receiving hole 17 for ventilation sash 8
The outer sash 3 and the ventilation sash 8 are integrated with each other while engaging with the a and engaging with the crescent receiver 18. 1-3) As shown in FIG. 1, the inner sash 2 and the ventilation sash 8 are integrated by the lock 22 of the inner sash 2. [Ventilation or Ventilation] 2-1) From the state of 1-3), as shown in FIG. 5, release the integrated state of the sashes 2 and 8 by the lock 22 of the inner sash 2, and then remove the outside. The inner sash 2 is overlaid inside the sash 3. [Unlocking the ventilation sash 8] 3-1) If necessary, after stacking the inner sash 2 on the ventilation sash 8, raise the operating portion 12b of the lever 12 as shown in FIGS. 3-2) As shown in FIGS. 2 (a) and 2 (b), the fitting portion 14 is recessed inward from the opening 10 of the vertical frame 3a, and the integrated state of the outer sash 3 and the ventilation sash 8 is released. To be done.

Next, a usage method peculiar to the second embodiment will be described. As shown in FIG. 6, the ventilation sash 8 is placed on the inside of the outer sash 3 in order to make it inconspicuous from the outside and to prevent sand and dust from being attached to the insect net 21, as shown in FIG. It is possible to lock the outer sash 3 and the ventilation sash 8 with the eight stacked. In this case,
As shown in (a) and (b), the opening / closing window 24 of the ventilation sash 8 is opened from the indoor side to perform the locking and unlocking operations.

Next, the operation of the sash window according to the present invention will be described. Since the outer frame of the ventilation sash 8 and the vertical gratings 20, 20a ... Are made of the same material as the inner and outer sashes 2, 3 as a common action in the first and second embodiments, it is strong and hard to break. Since the ventilation sash 8 in the locked state is fixed to the window frame 1 without rattling by the engagement of the fitting 13 and the crescent receiver 18 of the ventilation sash 8, the structure is the same as the locked state of the inner and outer sashes 2 and 3 themselves. Has strength. It is impossible to rotate the operation portion 12b of the lever 12 from the outside because no hand can be inserted between the vertical grids 20, 20a ... As the ventilation body 19. In addition, the outer sash 3 and the ventilation sash 8 in the locked state have a vertical frame.
The space between 3a and 8a is narrow, and there is not enough space to operate the equipment to be inserted between the vertical frames 3a and 8a. Furthermore, the vertical grid 20,
20a ... are fixed to the outer frame of the ventilation sash 8, and since the ventilation sash 8 can be removed only at the central portion of the window frame 1, it cannot enter from the outside.

As shown in FIGS. 3 (a) and 3 (b), when the ventilation sash 8 is locked, the operating portion 12b of the lever 12 is rotated downward to ventilate or ventilate the outer sash 3 and the inner sash. When the two are stacked, even if an attempt is made to remove the fitting body 13 from the receiving hole 17a by some operation, as shown in FIGS. 4 (a) and 4 (b), the outer surface 15 of the inner sash 2 (in the drawing, glass Outer surface)
The operation portion 12b comes into contact with the lever 12, the lever 12 integrated with the fitting body 13 does not rotate upward, and the fitting body 13 cannot be removed from the receiving hole 17a.

Since the outer sash 3 and the ventilation sash 8 do not project at all from their outer end surfaces, the outer sash 3 and the ventilation sash 8 can be arranged on either side of the window frame 1 to close the window frame 1. In particular, the outer sash 3 provided with the fittings 13 on the vertical frames 3a and 3b on both sides.
In the ventilation sash 8 in which the vertical holes 8a and 8b are respectively provided with the receiving holes 17a, the outer sash 3 is disposed on either side of the window frame 1 and the ventilation sash 8 is pulled up to the window frame 1 1 can be closed and locked without a gap. Therefore, in the sash window according to the present configuration, even if the ventilation sash 8 that blocks the view from the room is arranged on the left or the right side of the window frame 1, the sash window on the right or the left can easily obtain a comfortable view for the occupants. There is flexibility to lock 3 by sliding it.

[Second Embodiment] By stacking a ventilation sash 8 on the inner side of the outer sash 3, particularly when smoked glass is used for the inner and outer sashes 2, 3, the ventilation sash 8 is exposed from the outside.
, The inner and outer sashes 2 fitted in the window frame 1, even when the vertical lattices 20, 20a are used for the ventilation body 19,
The appearance of 3 is neat. Further, when the ventilation sashes 8 stacked on the inner side of the outer sash 3 are integrated by the fitting body 13, it is not necessary to individually slide the sashes 3, 8. By stacking the ventilation sash 8 on the inside of the outer sash 3 in winter, etc., the insect net 21 of the ventilation sash 8 when not in use is prevented from adhering sand, dust, and exhaust gas dirt, and prevents deterioration and corrosion of the insect net 21. . However, in the locked state, the positions of the pulling sashes 3 and 8 on the window frame 1 are always limited to one of them.

[0025]

In summary, according to the present invention, a plurality of slidable inner and outer sashes 2 and 3 are installed in a sliding manner on the window frame 1, and a slidable ventilation sash 8 is arranged between the inner and outer sashes 2 and 3. The fitting body 13 is provided on at least one side 3a of the outer sash 3, and the tip 14 (fitting portion) of the fitting body 13 is made to be retractable from the inner side surface 9 of the outer sash 3, while the ventilation sash 8 is provided.
At least on the outer side surface 16a of the other side 8a
Since the receiving hole 17a of 14 (fitting portion) is formed, the outer sash 3
The ventilation sash 8 arranged in the opposite direction can be locked or unlocked by retracting the fitting portion 14 of the fitting body 13 from the opening portion 10. Therefore, the ventilation sash 8 should be equipped with a crime prevention function. You can Also, the outer sash 3 and the ventilation sash 8
Even in the locked state, since the inner sash 2 is slidable, the opening area can be adjusted, and thus the ventilation volume and room temperature can be adjusted.

A fitting body 13 is provided on one side 3a of the outer sash 3, and a tip 14 of the fitting body 13 is freely retractable from the inner side surface 9 of the outer sash 3, while on the other hand, both sides 8a, 8b of the ventilation sash 8 are provided. Since the receiving holes 17a of the tip 14 of the fitting body 13 are formed on the outer side surface 16a of each of the outer sashes 3 and the ventilation sashes 8 when air ventilation or ventilation is not necessary, one side 3a of the outer sash 3 and another The outer sash 3 and the ventilation sash 8 can be integrated with one fitting 13 on the side 3b, so that the ventilation sash 8 and the inner sash 2 can be slid separately by not sliding them separately but sliding them together. It is possible to save the trouble.

On the inner end surface 6 of the vertical frame 3a of the outer sash 3,
Since the operation lever 12 for retracting the fitting body 13 is provided, there is nothing protruding from the outer end surface of the vertical frame 3a in the outer sash 3, and the outer sash 3 can be arranged on either side of the window frame 1,
There is no gap between the vertical frame 3a and the window frame 1. Therefore, the operation lever 12 can be moved from the room to lock the outer sash 3 and the ventilation sash 8 by pulling them together, and the ventilation sash 8 in the window frame 1 can be arranged either left or right. it can. In addition, even if the ventilation sash 8 or the inner sash 2 is stacked inside the outer sash 3 when unlocked, the lever 12
Is accommodated in the inner end surface 6 of the outer sash 3, and the lever 12 and the ventilation sash 8 or the inner sash 2 do not come into contact with each other, so that the ventilation sash 8 and the inner sash 2 can be smoothly opened and closed without being obstructed.

Fitting bodies 13 are provided on both sides 3a, 3b of the outer sash 3, and a tip 14 of the fitting body 13 is freely retractable from the inner side surface 9 of the outer sash 3, while on the other hand, both sides 8a of the ventilation sash 8,
Since the receiving holes 17a of the tip 14 of the fitting 13 are formed on the outer surface 16a of 8b, the outer sash 3 and the ventilation sash 8 are overlapped,
Since the outer sash 3 and the ventilation sash 8 can be integrated by selecting one of the fitting bodies 13, the fitting body 13 that is easier for the occupant to operate can be selected. Therefore, the fitting body 13 closer to the body can be selected.
It can be locked and unlocked by operating, and thus the locking and unlocking operation can be performed without difficulty. Further, when the lever 12 of the outer sash 3 is provided on the inner end face 6, the outer sash 3 and the ventilation sash 8 can be pulled to close and close the window frame 1, and the sashes 3 and 8 can be locked. Since it can be arranged on either side, the outside can be seen from the sash that is not blocked by the ventilation sash 8. In addition, it is determined whether the ventilation sash 8 is arranged on the left or right of the window frame 1 for convenience of ventilation, or for concealing a place in the room that should not be seen.
Since the ventilation sashes 8 can be arranged on both sides and can be locked and unlocked with respect to the window frame 1, it can be selected according to the preference of the occupant and the indoor situation.

Since the length of the operating lever 12 of the fitting body 13 is set longer than the distance between the center of rotation of the operating lever 12 and the outer surface 15 of the inner sash 2, even if the ventilation sash 8 is used, In order to release the integrated state of the sashes 3 and 8 by the fitting body 13, not only the glass of the outer sash 3 but also the glass of the inner sash 2 with which the operation lever 12 contacts can be rotated to rotate the lever 12. Therefore, if you try to enter from the outside, you have to break the glass of the inside and outside sashes 2 and 3, and it takes extra time, so you cannot easily enter from the outside, and therefore the ventilation sash 8
Can be equipped with a further security function.

If the outer sash 3 and the ventilation sash 8 are to be integrated with each other in an overlapping state, the ventilation sash 8 interferes with the operation of the operation lever 12, but the operation lever 12 is located at least at one side 8b of the ventilation sash 8. Since the part corresponding to the operating range of is detachable, the operating part 12b of the lever 12 can be handled from the indoor side while the ventilation sash 8 is overlapped inside the outer sash 3 by removing the part. The outer sash 3 and the ventilation sash 8 can be integrated.
Therefore, when ventilation or ventilation is not required, the ventilation sash 8 can be overlapped with the inside of the outer sash 3 to make it inconspicuous from the outside and protect the insect net 21 from sand, dust, exhaust gas and the like.

A fitting body at least on the other side 2a of the inner sash 2
23, and the tip of the fitting body 23 is freely retractable from the outer side surface 15 of the inner sash 2. On the other hand, the receiving hole 17 at the tip of the fitting body 23 is formed on the inner side surface 16 of at least the other side 8a of the ventilation sash 8.
Since the inner sash 2 is formed, the inner sash 2 can be overlapped with and integrated with the inner side of the ventilation sash 8, so that the same effect as described above can be obtained.

Since the ventilation sash 8 is composed of the outer frame and the ventilation member 19 which can be freely attached to and detached from the outer frame, the ventilation member 19 does not simply have a ventilation function, and when it is not desired to see the room from the outside, The vertical grids 20, 20a ... can be replaced with a shutter with a blind function. Further, the vertical lattices 20, 20a ... Can be replaced with those having an aesthetic function such as a stained glass frame to provide the ventilation sash 8 capable of meeting various demands of users, and It can be changed appropriately even after installation.

Since the insect net 21 is provided on either one of the front and back sides of the ventilation sash 8, by using the ventilation sash 8 as a conventional screen door, ventilation is possible while maintaining safety during summer nights. Therefore, it is possible to reduce the use of a cooler, etc., and save resources, protect the environment, and promote health.

Since the insect net 21 can be freely attached to and detached from the ventilation sash 8, only the lightweight insect net 21 can be removed from the window frame 1 without removing the entire ventilation sash 8.
The cleaning operation is simple and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a sash window according to the present invention.

FIG. 2 (a) is an enlarged view of a main part showing a state in which the tip of the fitting body is retracted into the opening when unlocking in FIG.
(B) is an AA sectional view of (a).

3 (a) is an enlarged view of a main part showing a state in which the tip end of the fitting body is engaged with the crescent receiver of the ventilation sash in unlocking in FIG. 1, and FIG. 3 (b) is (a). BB
FIG.

FIG. 4 (a) is an enlarged view of an essential part showing a state where an operation lever is brought into contact with the outer surface of the inner sash in FIG.
(B) is CC sectional drawing of (a).

FIG. 5 is a state diagram of each sash during ventilation or ventilation.

FIG. 6 is a view showing a state in which a ventilation sash is arranged inside the outer sash and the window frame is closed by the inner and outer sashes in the second embodiment.

7A is an overall view of a ventilation sash provided with an opening / closing window, and FIG. 7B is a partially enlarged view of the opening / closing window of the ventilation sash.

FIG. 8 is a horizontal sectional view of a conventional sash.

[Explanation of symbols]

1 window frame 2 Inside sash 2a other side 3 outside sash 3a one side 3b other side 6 Inner face 8 Ventilation sash 8a other side 8b one side 9 Inside surface 12 Operation lever 13 mating body 14 tip 15 Outer side 16 Inside 16a outer surface 17 Receiving hole 17a Receiving hole 19 Ventilator 21 insect screen 23 Mating body

Claims (10)

[Claims] 1. A plurality of slidable sashes are installed on a window frame in a sliding manner, a slidable ventilation sash is arranged between the sashes, and a fitting body is provided on at least one side of the outer sash, The crime prevention structure for a sash window, characterized in that the tip of the fitting body is allowed to freely project and retract from the inner side surface of the outer sash, while the receiving hole for the tip of the fitting body is formed on at least the outer side surface of the ventilation sash. . 2. A fitting body is provided on one side of the outer sash, and the tip of the fitting body is retractable from the inner side surface of the outer sash. On the other hand, the fitting body is provided on both outer side surfaces of the ventilation sash. The security structure for a sash window according to claim 1, wherein each of the receiving holes at the tip is formed. 3. The inner end surface of the vertical frame on the outer sash,
The crime prevention structure for a sash window according to claim 1 or 2, further comprising an operation lever for retracting the fitting body. 4. The fitting body is provided on both sides of the outer sash, and the tip of the fitting body is made to be retractable from the inner side surface of the outer sash. On the other hand, the fitting body tip is provided on the outer sides of both sides of the ventilation sash. 4. The security structure for a sash window according to claim 3, wherein each of the receiving holes is formed. 5. The sash window according to claim 3, wherein the length of the operating lever of the fitting body is set to be longer than the distance between the center of rotation of the operating lever and the outer surface of the inner sash. Security structure. 6. The crime prevention structure for a sash window according to claim 3, wherein a portion of at least one side of the ventilation sash corresponding to the operating range of the operation lever is detachable. 7. A fitting body is provided on at least the other side of the inner sash, and the tip of the fitting body is retractable from the outer surface of the inner sash, while on the other hand, on the inner surface of at least the other side of the ventilation sash. 7. The security structure for a sash window according to claim 1, wherein a receiving hole at the tip of the fitting body is formed. 8. The ventilation sash is composed of an outer frame and a ventilation member detachably attached to the outer frame.
The sash window security structure according to 3, 4, 5, 6 or 7. 9. An insect screen is provided on either one of the front and back sides of the ventilation sash.
The sash window security structure according to 5, 6, 7 or 8. 10. The crime prevention structure for a sash window according to claim 9, wherein an insect screen is detachably attached to the ventilation sash.