JPH0235992Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Field of industrial application] This invention consists of superimposing and mounting a surface base plate and an impulse plate in which ventilation holes of the same pitch are formed in parallel, and the sliding plate is controlled by a knob member. This invention relates to a ventilation device that allows both ventilation ports to be opened and closed by sliding operation.

[Conventional technology]

A schematic configuration of a conventional ventilation system using this type of surface base plate and sliding plate is shown in FIGS. 9a, b, and c. In FIGS. 9a, b, and c, reference numerals 1 and 2 indicate a surface board on which a plurality of fixed side ventilation ports 3 and movable side ventilation ports 4 are formed in parallel at predetermined positions at the same pitch interval, and this surface board. 5 shows a sliding plate that is slidably attached to the sliding plate 2, and 5 is a knob that is attached to the sliding plate 2 from the surface side of the surface base plate 1 through a guide slot 6 using a mounting screw or the like (not shown). It is a member. Then, by operating the knob member 5 and sliding the sliding plate 2 with respect to the surface base plate 1 fixed to an appropriate member, each of the ventilation holes 3, 4
The two can be opened and closed mutually.

[Problem that the invention attempts to solve]

In the conventional ventilation system described above, in order to attach the knob member 5 that performs sliding opening/closing operations to the sliding plate 2, a mounting screw or the like is generally used to attach the knob member 5 from the surface side to the guide elongated hole 6 of the surface base plate 1. The grip member is abutted against the sliding plate 2 through the screws, and is attached from the back side using mounting screws, which makes the work of assembling the knob member troublesome, and it is necessary to remove and attach the knob member when cleaning the ventilation system, etc. However, in this case, there were problems in that workability deteriorated and the number of parts increased.

In addition, since it is necessary to arrange the knob member 5 at a surface position on the surface base plate 1, some of the fixed side ventilation ports 3 that are arranged in parallel with the same shape may have different shapes or
In this case, it is necessary to form the fixed side ventilation ports 3a with different lengths, which disturbs the orderly arrangement of each fixed side ventilation port 3 and even each movable side ventilation port 4, which is undesirable in terms of design. There was a problem that the balance was lost and it was visually and sensually undesirable.

As one means for not disturbing the arrangement of the ventilation ports 3 and 4, for example, each ventilation port may be made short in length, and a knob member may be placed outside the row of ventilation ports.
It may be possible to place a There were also some problems.

[Disclosure of invention]

This invention solves the above-mentioned problems and makes it possible to easily attach and detach the knob member to the sliding plate without using mounting screws, and also to create a knob member that does not interfere with the orderly arrangement of each ventilation hole. It is an object of the present invention to provide a ventilation device that can be equipped with a ventilator, has no risk of damaging its appearance, and can make effective use of the ventilation permissible surface.

[Means for solving problems]

This idea consists of a surface board in which a plurality of fixed side ventilation holes are formed in parallel at predetermined pitch intervals, and a sliding board in which a plurality of movable side ventilation holes corresponding to the fixed side ventilation holes are formed at the same pitch interval. In the ventilation device, a sliding plate is fitted and held on the back side of the front base plate so as to be openable and closable by sliding in the longitudinal direction, and the front base plate is arranged in parallel with the fixed side ventilation opening corresponding to a sliding distance. A guide opening is formed that is wide in width and has one side that also serves as a fixed side ventilation opening, and one side of the sliding plate that corresponds to the fixed side ventilation opening is movable. Forms a mounting opening that also serves as a side ventilation opening,
On the other side of this mounting opening, a protrusion protrudes from the inner edge of one side along the longitudinal direction of the sliding plate, and a notch is provided on the other side of the protrusion, and a notch is provided on the other side of the protrusion. An engagement space is formed in which an engagement recess is provided on the inner edge of the other side along the sliding plate, and the knob member has a knob on the surface side and completely covers the guide opening in the closed state of the sliding plate. A base part is sized to open only the part of the guide opening that also serves as the fixed side ventilation port when the moving plate is open, and a mounting part is connected to the back side of this base part through a constriction part. A locking protrusion and an engaging protrusion are respectively protruded from one side and a part of the other side along the longitudinal direction of the sliding plate, and the mounting part is obliquely inserted into the guide opening and the mounting opening. The knob member is formed into a shape and size that allows insertion, the base portion is supported on the surface of the surface base plate, the constricted portion is fitted into the guide opening so as to be slidable in the longitudinal direction of the sliding plate, and the knob member is formed into a shape and size that allows insertion. The attachment part is fitted into the engagement space of the attachment opening so as to be engageable and detachable by rotation, and the locking protrusion is engaged with the protrusion of the engagement space, and the engagement protrusion is The mounting portion is held in the engagement space so as not to be movable in the longitudinal direction of the sliding plate by engaging with the engagement recess, and both protruding portions of the mounting portion are inserted into the guide opening on the back surface of the front base plate. The knob member is prevented from falling out by protruding from the opposite side of the part.

[Effect]

In the ventilation window of this invention, when the sliding plate is in the open state, that is, in the ventilation open state, the fixed side ventilation port and the movable side ventilation port are aligned, and one end of the guide opening and one side of the mounting opening are aligned. coincide with each other, and one side of these serves as both the fixed-side ventilation port and the movable-side ventilation port, so the entire ventilation permissible surface can be effectively utilized. Also,
When the sliding plate is in the open state, the base portion of the knob member covers all but one side of the guide opening, and when the sliding plate is in the closed state, the base portion of the knob member completely covers the entire guide opening. One side of the guide opening on the surface base plate also serves as the fixed side ventilation hole, and one side of the mounting opening on the sliding plate also serves as the movable side ventilation hole. By not providing side ventilation holes, the knob member can be provided without interfering with the orderly arrangement of the ventilation holes, and there is no risk of spoiling the appearance.

Furthermore, in the ventilation system of this invention, the sliding plate is slidably fitted and held on the surface base plate, and the guide opening of the surface base plate is aligned with the mounting opening of the sliding plate. The grip member is inserted into the mounting opening from the surface side of the base plate at an angle so that both protrusions of the mounting portion correspond to the diagonal line of the guide opening (see FIG. 6a). Then, by rotating the knob member, the attachment part is fitted into the engagement space of the attachment opening, the locking protrusion of the attachment part is locked to the engagement protrusion, and the attachment part of the attachment part is locked. By engaging the mating protrusion with the mating recess of the mating space, the mounting part is held in the mating space with no movement in the longitudinal direction of the sliding plate, and both of the protrusions of the mounting part The knob member can be attached to the sliding plate by protruding from the opposite side of the guide opening on the back side of the front plate to prevent the knob member from coming off (see FIGS. 6b and 6c). Then, the knob member can be removed by performing the reverse procedure to the above-described procedure. Therefore, the knob member can be attached and detached with good workability only by operating from the surface side of the surface base plate, without using screws or the like.

〔Example〕

Hereinafter, one embodiment of the ventilation device according to this invention will be described in detail with reference to FIGS. 1 to 8.

FIGS. 1, 2, and 3 show the configuration of the ventilation system according to this embodiment, and FIGS. b shows the configuration of each of the above-mentioned knob members,
In each of these figures, numeral 11 is a surface substrate;
2 is a sliding plate, and 13 is a presser plate.

As shown in FIG. 4a, the surface substrate 11 has a plurality of fixed side ventilation holes 14 formed in parallel at predetermined pitch intervals on the surface along the longitudinal direction, and has a plurality of fixed side ventilation holes 14 formed in parallel on the surface along the longitudinal direction of the surface substrate 11 on one end side. A guide opening 15 is formed, which doubles as a fixed side ventilation opening and is widened outward by a width corresponding to the sliding distance described later, and mounting holes 16 and 1 are provided at both longitudinal ends on the surface.
6 are provided, and both side edges along the longitudinal direction are bent inward on the back surface to form mutually opposing guide grooves 17,
17 is formed.

As shown in FIG. 4b, the sliding plate 12 has a length shorter than the front substrate 11, and similarly has a plurality of movable side ventilation holes 18 corresponding to each of the fixed side ventilation holes 14, Attachment openings 19 which are disposed at positions corresponding to the guide openings 15 and which also serve as movable-side ventilation ports are formed on the longitudinally inner side of the sliding plate 12 at the same pitch interval. In this attachment opening 19, an attachment engagement space 19b is connected to the outside of an inner portion 19a which also serves as a movable side ventilation opening, and the longitudinal dimension of the sliding plate 12 of this engagement space 19b is the same as that of the guide opening. 15 is made longer than the width of the outside. The engagement space 19b has a protrusion 20 on the inner edge of one side along the longitudinal direction of the sliding plate 12 that separates a side that also serves as a movable ventilation port, and a notch extending from the protrusion 20 to the outer end of the engagement space 19b. An engagement recess 22 is formed on the inner edge of the other side closer to the outer end than the protrusion 20. Further, the sliding plate 12 leaves both side edges along the longitudinal direction as sliding edges 23, 23 which are slidably fitted into the guide grooves 17, 17, and leaves the sliding edges 23, 23 on the back side along the sliding direction. Engagement pieces 24, 24 are provided in a protruding manner.

As shown in FIG. 4c, the presser plate 13 has a plurality of movable side ventilation holes 25 corresponding to each of the movable side ventilation holes 18 and a part of the movable side ventilation holes of the mounting opening 19. are formed at the same pitch.

The knob member 26 is detachably attached to the mounting opening 19 of the sliding plate 12 through the guide opening 15 of the front substrate 11. As shown in FIGS. 5a and 5b, the knob member 26 includes a base portion 27 having a knob portion 28 on its surface, and a base portion 27 that is slightly thicker than the guide opening 15 on the back side of the base portion 27. Narrow portion 29 and mounting opening 1
A mounting portion 30 whose thickness is slightly thinner than 9 is successively provided.

As will be described later, when the sliding plate 12 is slid in the closing direction, that is, in the closed state, the base portion 27 completely covers the guide opening 15.
Moreover, when the guide opening 15 is slid in the opening direction, that is, in the open state, only the portion of the guide opening 15 that also serves as the fixed side ventilation port is sized to open. The constricted portion 29 is connected to the protrusion 20 of the mounting opening 19.
It has an angular cross section that is large enough to fit beyond the movable side and into the side opposite to the side that also serves as the ventilation port.
Further, the mounting portion 30 has locking protrusions 30b on the inner edges of one side and the other side along the longitudinal direction of the sliding plate 12.
and an engaging protrusion 30a protrude from a portion of the longitudinal direction, and both protrusions 30b, 30
The length between the protruding ends of a is at least large enough to allow insertion into the guide opening 15 on the diagonal line thereof, and when it is rotated after being inserted beyond the guide opening 15 and into the mounting opening 19. Then, both protrusions 30a and 30b enter the attachment engagement space 19b of the attachment opening 19, and the locking protrusion 30b once falls into the notch 21, causing the side edge 30c to enter the engagement space 19b. The shape is such that the engaging protrusion 30a can be engaged with the engaging recess 22 from this state.

In the figure, reference numeral 31 denotes a protrusion serving as a resistance element that slightly protrudes parallel to the sliding direction on the back side of the base portion 27, and for operation in the sliding direction, It acts as a resistance to the extent that it does not interfere with its smooth movement, and when it comes to movement in a direction perpendicular to the sliding direction for assembly, which will be described later, it can act as a sufficient resistance to maintain the assembled state. ing. Further, 32 is a wire mesh for insect control.

To assemble the ventilation system of this embodiment, first cover each ventilation opening 14 of the sliding plate 12 from the back side with a wire mesh 32, and then cover the sliding plate 12 with a wire mesh 32.
is held down by the holding plate 13, and the engaging piece part 24,
Each sliding edge 23, 23 of the sliding plate 12 is bent inward and pressed in place to prevent insects.
from the back side of the front substrate 11 to each guide groove 17,1.
7 so that it can slide freely.

Next, as in the installation procedure shown in FIGS. 6a, b, and c, first, the guide opening 1 of the surface base plate 11 is
5 and the mounting opening 19 of the sliding plate 12,
Position them so that the inner parts that also serve as the fixed and movable side ventilation ports, that is, the inner edge parts on the left side in this case, coincide with each other. In this state, from the front side of the front substrate 11, the mounting portion 30 of the knob member 26 is
and the mounting opening 19 with the protrusions 30a and 30b corresponding to the diagonal lines of the upper left corner and the upper right corner within the guide opening 15.
Insert it all the way inside. By this insertion operation, the engaging protrusion 30a side is inserted into the inner upper left corner ridge of the mounting opening 19, and the locking protrusion 30b side is inserted into the guide opening 1.
5 and into the engagement space 19b of the attachment opening 19 (FIG. 1A).
Next, from the state shown in FIG. 6a, the knob member 2 is
6 in the direction of the arrow and rotated clockwise, the engagement protrusion 30a of the attachment part 30 slides on the inner surface of the attachment opening 19 toward the engagement space 19b, and the engagement protrusion Using the sliding portion of 30a as a fulcrum, the locking protrusion 30b enters deeper into the engagement space 19b (FIG. 2b). By further continuing the rotation, a part of the protruding end of the engagement protrusion 30a begins to enter the engagement recess 22, and the side surface of the locking protrusion 30b is brought into contact with the side surface of the protrusion 20, and the side edge 30c The side surfaces of the engagement space portion 19a are brought into contact with the inner surface of the engagement space 19a, and a state is created between the two side surfaces. Thereafter, when it is moved upward in the direction of the arrow, the engagement protrusion 30a side is fitted into and engaged with the engagement recess 22 while being narrowed between the side surfaces (FIG. 6c).

The ventilation device obtained as described above is
The base portion 27 of the knob member 26 is supported on the surface of the front substrate 11, the constricted portion 29 is inserted into the guide opening 15 of the front substrate 11 so as to be slidable in the longitudinal direction of the sliding plate 12, and the mounting portion 30 is It is fitted into the engagement space 19b of the mounting opening 19 provided in the sliding plate 12, the engagement protrusion 30a is engaged with the engagement recess 22, and the locking protrusion 30b is engaged with the engagement recess 22.
0 from the right side of FIG. 6c, the mounting part 30 is held in the engagement space 19b so as not to be movable in the longitudinal direction of the sliding plate 12, and both protrusions 30a of the mounting part 30 are , 30b protrude from the opposite side of the guide opening 15 on the back side of the front substrate 11, so that the front substrate 11 is held between the base portion 27 and the mounting portion 30 so that the knob member 26 is prevented from coming off toward the front surface. There is.

In this embodiment, as described above, as shown in FIGS. 1 to 3, the front substrate 11, the sliding plate 1
2 and the knob member 26 can be easily assembled with each other, and can also be easily disassembled by performing the reverse operation to that described above.

This ventilation system, for example, as shown in Figure 7,
It is applied to the bay window 33, etc., and serves to ventilate the room.

Therefore, in the ventilation system according to this embodiment, regarding the attachment structure of the knob member 26 to the sliding plate 12, the attachment portion 30 of the knob member 26 is attached to the sliding plate 1.
Engagement space 19b of attachment opening 19 in 2
By simply operating the knob member 26 from the surface side, it can be easily assembled and engaged, and it can be firmly held in this engaged state. That is, in order to attach both of these, additional attachment members such as attachment screws and locking washers are not required.

In this assembled state, the sliding plate 12 can be slid against the front substrate 11 by operating the knob member 26 in the direction of arrow A or B, as shown in FIG. , due to this sliding movement, in the opening direction shown by arrow A,
Each of the fixed and movable side ventilation holes 14 and 18 and its 25, and the part of each opening 15 and 19 that is fixed and the portion that also serves as the movable side ventilation hole are opened in agreement with each other, so that ventilation, that is, ventilation. It becomes possible,
Further, in the case of the closing direction shown by arrow B, these are completely shifted from each other and closed to prevent ventilation.

Further, in this operation, due to the shape and size of the base portion 27 of the knob member 26 with respect to the guide opening 15 of the front substrate 11, when the knob member 26 is slid in the closing direction, the guide opening Since the guide opening 15 is completely covered and is specified in such a way that only the part of the guide opening 15 that also serves as a ventilation opening can be opened when the guide opening 15 is slid in the opening direction.
When the ventilation is opened, the guide opening 15 of the knob member 26
are opened with the same or almost the same area as in each of the fixed and movable side ventilation openings 14 and 18, and when the ventilation is closed, on the contrary, the guide opening 15 of the knob member 26 is opened. , as well as in each fixed and movable vent 14, 18, will be completely covered.

FIG. 8 is an enlarged view of the main part of the configuration diagram showing the outline of the window structure in FIG.
and an indoor lower frame 36 without locking strips. And the lower frame 3 of the above configuration
7, once installed inside the knob member 26,
The outdoor side cannot be rotated as shown in FIG. 6a by the lower frames 36 and 35, so it will not come off. By combining such a lower frame structure and the ventilation device, the ventilation device has a locking mechanism that prevents it from coming off when it is assembled into the lower frame. On the other hand, the ventilation device can be removed from the lower frame 37 by removing the screws fastened to the mounting holes 16 of the ventilation device, and in this state, the knob member 26 is operated in the opposite direction to the assembly order shown in FIG. The ventilation system can be disassembled.

In the embodiment described above, it goes without saying that the attachment of the wire mesh 32 and its holding plate 13 to the sliding plate 12 may be selected and used as desired.

[Effect of idea]

As detailed above, according to this invention, a surface board has a plurality of fixed side ventilation holes formed in parallel at predetermined pitch intervals, and a plurality of movable side ventilation holes corresponding to the fixed side ventilation holes are formed at the same pitch. In the ventilation device, the ventilation device is provided with a sliding plate formed at intervals, and the sliding plate is fitted and held on the back side of the front base plate so as to be openable and closable by sliding in the longitudinal direction. A guide opening having a width corresponding to the sliding distance and whose one side also serves as a fixed side ventilation opening is formed in parallel, and a fixed side ventilation opening on one side of the guide opening is formed in the sliding plate. One side corresponding to this forms a mounting opening that also serves as a movable side ventilation port, and a protrusion protrudes from the inner edge of one side along the longitudinal direction of the sliding plate on the other side of this mounting opening, and this protrusion A notch is provided on the other side of the sliding plate, an engagement space is formed in which an engagement recess is provided on the inner edge of the other side along the longitudinal direction of the sliding plate, and the knob is provided with a knob on the surface side. a base portion having a size that completely covers the guide opening when the sliding plate is closed and opens only a portion of the guide opening that also serves as a fixed side ventilation opening when the sliding plate is open; A mounting portion is provided on the back side of the base portion and is connected to the base portion through a constriction, and a locking protrusion and an engaging protrusion are provided on one side and a part of the other side of the mounting portion along the longitudinal direction of the sliding plate, respectively. The mounting portion is protruded,
The sliding plate is formed in a shape and size such that it can be inserted obliquely into the guide opening and the mounting opening, the base part is supported on the surface of the surface base plate, and the constricted part is inserted into the guide opening in the longitudinal direction of the sliding plate. The attachment part is fitted in the engagement space of the attachment opening so as to be slidable in the direction, and the attachment part is fitted in the engagement space of the attachment opening so as to be detachable by rotation of the knob member, and the locking protrusion is inserted into the engagement space of the engagement space. At the same time, the engagement protrusion is engaged with the engagement recess to hold the mounting part in the engagement space so as not to move in the longitudinal direction of the sliding plate, and the mounting part is Since both of the protrusions are made to protrude from opposite sides of the guide opening on the back surface of the front board to prevent the knob member from coming off, the following effects can be obtained.

That is, in this invention, when the sliding plate is in the open state, that is, in the ventilation open state, the fixed side ventilation port and the movable side ventilation port are aligned, and one side of the guide opening and one side of the mounting opening are aligned. coincide, and one side of these serves as both the fixed side ventilation port and the movable side ventilation port, so the entire ventilation permissible surface can be effectively utilized and a sufficient amount of ventilation can be obtained. In addition, when the sliding plate is open, the base portion of the knob member covers all but one side of the guide opening, and when the sliding plate is closed, the base portion of the knob member completely covers the entire guide opening. Moreover, one side of the guide opening on the surface base board also serves as the movable side ventilation port, and one side of the mounting opening on the sliding plate also serves as the movable side ventilation port. By not providing different fixed-side ventilation ports, the knob member can be provided without interfering with the orderly arrangement of the ventilation ports, and the appearance of the ventilation device can always be kept in good condition. Furthermore, in the ventilation system of this invention, the sliding plate is slidably fitted and held on the surface base plate, and the guide opening of the surface base plate is aligned with the mounting opening of the sliding plate. Remove the knob member from the surface side of the base plate.
It is inserted into the mounting opening at an angle so that both protrusions of the mounting part correspond to the diagonal lines of the guide opening (see FIG. 6a). Then, by rotating the knob member, the attachment part is fitted into the engagement space of the attachment opening, the locking protrusion of the attachment part is locked to the protrusion of the engagement space, and the attachment is completed. By engaging the engagement protrusion of the part with the engagement recess of the engagement space, the attachment part is held in the engagement space with no movement in the longitudinal direction of the sliding plate, and the attachment part is By causing both of the protrusions to protrude from opposite sides of the guide opening of the surface base plate to prevent the knob member from coming off (see FIGS. 6b and 6c),
The knob member can be attached to the sliding plate. Then, the knob member can be removed by performing the reverse procedure to the above-described procedure. Therefore, there is an effect that the knob member can be attached and detached with good workability only by operation from the surface side of the surface base plate without using screws or the like.

The present invention is suitable for a ventilation device that slides in the horizontal direction of the lower frame, and from this point, it can easily disassemble and clean the device, eliminating the difficulty that dust accumulates, which is peculiar to devices that have a structure that slides in the horizontal direction. By doing so, it is possible to overcome the problem and make the ventilation system for sash windows, which had various problems in terms of security such as peeping, safer and more efficient.

[Brief explanation of the drawing]

1 and 2 are a front view and an end view showing the configuration of an embodiment of the ventilation system according to this invention, and FIG.
The figures are an enlarged sectional view of the line part in Figure 1, Figure 4a,
b, c are the front and end views of the surface base plate, sliding plate, and presser plate, respectively; Fig. 5 a, b are the front view and side view of the knob member; Fig. 6 a, b, and c are the knobs. FIG. 7 is an explanatory diagram showing the procedure for attaching members, FIG. Figures a, b, and c are a front view, an explanatory end view, and an enlarged front view of a ventilation opening showing the general configuration of a conventional ventilation device. 11...Surface base plate, 12...Sliding plate, 13...
Presser plate, 14...Fixed side ventilation port of surface base plate, 15
... Guide opening of surface base plate, 18, 25 ... Movable side ventilation port of sliding plate, presser plate, 19 ... Installation opening of sliding plate, 19a ... Inside part, 19b ... Engagement space Part, 20... Projection, 21... Notch, 2
2... Engagement recessed portion, 26... Knob member, 27... Base portion of the knob member, 29... Narrow portion of the knob member,
30... Attachment portion of knob member, 30a... Engagement protrusion, 30b... Locking protrusion, 32... Wire mesh.

Claims (1)

[Scope of utility model registration request] A surface board having a plurality of fixed side ventilation holes formed in parallel at predetermined pitch intervals, and a sliding plate having a plurality of movable side ventilation holes corresponding to the fixed side ventilation holes formed at the same pitch interval, In a ventilation system in which a sliding plate is fitted and held on the back side of a front base plate so that it can be opened and closed by sliding in the longitudinal direction, the front base plate has a width corresponding to the sliding distance in parallel with the fixed side ventilation opening. A wide guide opening is formed, one side of which also serves as a fixed side ventilation opening, and one side of the sliding plate corresponding to the fixed side ventilation opening of one side of the guide opening serves as a movable side ventilation opening. A mounting opening that also serves as a mounting opening is formed, a projection protrudes from the inner edge of one side along the longitudinal direction of the sliding plate on the other side of the mounting opening, and a notch is provided at the other end of the projection. An engagement space is formed with an engagement recess on the inner edge of the other side along the longitudinal direction of the sliding plate, and the knob member has a knob on the surface side, and when the sliding plate is in the closed state, the guide A base part is sized to completely cover the opening and open only the part of the guide opening that also serves as the fixed side ventilation port when the sliding plate is open, and is connected to the back side of this base part through a constriction part. a mounting part is provided, a locking protrusion and an engaging protrusion are respectively protruded from one side and a part of the other side of the mounting part along the longitudinal direction of the sliding plate, and the mounting part is tilted to form the The base portion is formed in a shape and size that can be inserted into the guide opening and the mounting opening, the base portion is supported on the surface of the surface base plate, and the constricted portion is inserted into the guide opening in the longitudinal direction of the sliding plate. The mounting part is movably fitted into the engagement space of the mounting opening so as to be detachable by rotation of the knob member, and the locking protrusion is locked to the protrusion of the engagement space. At the same time, the engagement protrusion is engaged with the engagement recess to hold the attachment part in the engagement space so as not to be movable in the longitudinal direction of the sliding plate, and both of the protrusions of the attachment part A ventilation device characterized in that a knob member is prevented from falling out by protruding from the opposite side of the guide opening on the back side of the front board.