JP3050755B2 - Screen door - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen door which is attached to a building entrance, a window, or the like, and which is opened and closed by expanding and contracting a bellows-like insect repellent net (hereinafter simply referred to as a net) in a direction parallel to the opening.

[0002]

2. Description of the Related Art A telescopic screen door has been proposed in which the screen is shortened to one of the left and right sides of the opening when the screen is not used so that the entire opening can be opened. In this case, in order to expand and contract the net, one vertical edge of the net 106 is fixed to a movable vertical frame 105 which is moved along the upper frame 101 and the lower frame 102 of the opening frame 100 as shown in FIG. Then, the other vertical edge of the mesh 106 is fixed to the one vertical frame 104 side of the opening frame 100, and the movable vertical frame 105 is
It is structured to move in parallel with the opening surface of 00.

In order to open or close the net 106 smoothly in FIG. 10, it is necessary that the movable vertical frame 105 always moves smoothly in a vertical state even if a force is applied at an arbitrary height. It is. Also, in such telescopic screens, regardless of the position of the movable vertical frame,
That is, regardless of the length of the net, it is necessary to hold the net so that it does not bend by wind or livestock. For this reason, in a conventional screen door, a string 107 penetrating through each pleat of the net 106 is provided on a movable vertical frame 105 by a roller 1.
08 to the end of the upper frame 101 and the lower frame 102,
The string 10 is fixed regardless of the position of the movable vertical frame 105.
The length 7 is kept constant.

[0004]

However, when performing such maintenance of the screen door, it is necessary to remove the movable vertical frame 105, the net 106, and the string 107 from the opening frame 100. However, in the conventional screen door, the roller 108 is disposed inside the opening frame 100 and the movable vertical frame 105, and the string 107 is attached to the opening frame 100, the movable vertical frame 105,
And the opening frame 10
0, the interconnecting structure or supporting structure of the movable vertical frame 105, the net 106, and the string 107 is complicated. Therefore, with respect to the opening frame 100, the movable vertical frame 105, the net 10
6, and the operation of attaching and detaching the cord 107 was troublesome, so that attachment and maintenance to the opening frame of the screen door were difficult. The present invention has been made in view of the above points, and an object of the present invention is to provide a telescopic screen door that can be easily attached to an opening frame and maintained.

[0005]

In order to achieve the above object, the screen door of the present invention moves one vertical edge of a foldable telescopic net upward and its lower end along an open frame and along a lower frame. The other vertical edge of the mesh is fixed to one vertical frame of the opening frame, and the mesh is provided between the movable vertical frame and the vertical frame. And a sliding door comprising a rail extending in the longitudinal direction of the upper frame of the opening frame, and a slider fitted in the rail and sliding in the longitudinal direction. By attaching the rail, the upper end of the movable vertical frame is removably attached to the slider of the slide rail via a connection fitting, and a lower frame of the opening frame is provided with a guide member extending in the longitudinal direction thereof. , An engagement piece movably engaged with the guide member in the longitudinal direction. The cord is detachably connected to the lower end of the movable vertical frame, and the string whose one end is detachably fixed to one of the vertical frames of the opening frame is horizontally penetrated through the net, and the other end of the string is The winding shaft is coupled to a winding shaft rotatably provided in a movable vertical frame, and the winding shaft is rotated forward or backward according to the movement of the movable vertical frame, thereby winding or rewinding the string. The other vertical edge of the net is detachably fixed to one vertical frame of the opening frame.

Further, in the screen door of the present invention, one end of the string is connected to a tensioning means for constantly applying a tension in the tensioning direction to the string, and the tensioning means is connected to one vertical frame of the opening frame. It is characterized by having a case detachably attached, and a biasing member housed in the case, one end of which is fixed, and a free end coupled to the other end of the string. Further, in the screen door of the present invention, the tensioning means pivots a roller near the entrance of the case to change the moving direction of the string to a substantially right angle direction, and connects one end of the string to the vertical direction through the roller. It is characterized in that it is connected to a free end of a biasing member that expands and contracts.

Further, a storage groove is provided in the indoor portion of the vertical frame so as to open in the direction of another vertical frame, and the case of the tensioning means is stored and mounted in the storage groove.

[0008]

According to the above construction, a movable vertical frame constituting a screen door,
The string and the net are detachably attached to the opening frame while being joined together. In addition, since the cord is wound on the winding shaft in the movable vertical frame, it can be attached to and detached from the opening frame without having to disassemble the movable vertical frame, the cord, and the net. Maintenance becomes easy.

A case in which the tensioning means is detachably attached to one of the vertical frames of the opening frame, and a biasing member which is housed in the case and has one end fixed and a free end connected to one end of the cord. In the case of the unit having the structure, it is possible to prevent one end of the string from coming off the net, and to easily remove the end of the string from the vertical frame of the opening frame.

[0010] A tensioning means pivotally connects a roller near the entrance of the case to change the direction of movement of the cord to a substantially right angle direction, and one end of the cord is arranged vertically along the roller via the roller. In a case where the tension member is connected to the other end of the biasing member, the longitudinal direction of the tension member can be arranged along the longitudinal direction of the opening frame, so that a space for installing the tension member can be saved, and the tension member can be attached to and detached from the vertical frame. Easy.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view of an entrance with a screen door according to an embodiment of the present invention viewed from the indoor side, FIG. 2 is a vertical cross-sectional view along the line XX of FIG. 1, and FIG. 3 is a cross section with the screen door closed. Area view, FIG. 4
Is a cross-sectional view of a state where the screen door is opened, FIG. 5 is a vertical cross-sectional view showing a configuration of the spring unit, FIG. 6 is a vertical cross-sectional view showing a modification of the spring unit, and FIG. FIG. 8 is an exploded perspective view of a main part showing a connecting structure, and FIG. 8 is a side view mainly showing a slide rail.

In FIG. 1, A is an opening frame fixed to a frame at an entrance or a window. An upper frame 1, a lower frame 2, and left and right vertical frames 3 and 4 are connected to each other in a rectangular shape by a usual method. I have. In FIG. 1, the door is omitted. As shown in FIGS. 2 to 4, on the outdoor side portion from the expected width center of the opening frame A,
A known door B is mounted on a hinge 5 so that it can be rotated around the hinge to the outside to open and close.

A groove 7 is formed in a portion of the upper frame 1 at the indoor side of the door stop wall 6 provided at the expected width center and continuously downwardly opening in the longitudinal direction of the upper frame 1. The upper end of the movable vertical frame MJ, which is a component of the screen door C, can be movably fitted in the groove 7. In addition, a guide groove (guide member) that opens continuously in the longitudinal direction of the lower frame 2 in the outdoor direction in a portion on the indoor side of the door stop wall 8 provided at the expected width center of the lower frame 2.
9 are formed. Instead of forming the guide member integrally with the lower frame, a member formed separately may be connected to the lower frame 2.

On the indoor side of the door stops 10 and 12 provided at the center of the expected widths of the vertical frames 3 and 4, there are formed receiving portions 11 and 13 which open in the directions of the other vertical frames. Vertical frame (vertical frame that is close to the movable vertical frame MJ when the screen door is closed.
In 3 and 4, the opening of the housing 11 of the left vertical frame 3) is
It is shielded by the shielding member 14.

As shown in detail in FIG. 8, the shielding member 14 is formed by integrally forming a pair of engaging projections 14b on the back surface of the band plate 14a, and is continuous with the center of the surface of the band plate 14a in the longitudinal direction. The magnet MG is fixed to the groove 14c formed so as to correspond to the magnetic plate 30 attached to the MJ shielding member of the movable vertical frame, which will be described later, by press-fitting. A soft member S such as a mohair (not shown) is fitted and fixed to the portion. As shown in FIG. 8, the shielding member 14 has a pair of grooves 11 a formed on the opening surface of the accommodation portion 11 of the vertical frame 3 by engaging the engaging lip 14 b.
And is fixed by push-fit engagement.

The other vertical frame (a vertical frame close to the movable vertical frame MJ when the screen door is opened, the right vertical frame 4 in FIGS. 1, 3 and 4) is provided in the accommodating portion 13 with a bellows-like foldable net 37. The spring unit 15 which constitutes a tensioning means that constantly applies a biasing force in the tensioning direction to the string 38 that penetrates and supports in a horizontal direction is fixed. As shown in FIG. 5, the spring unit 15 includes a case 15a, a coil spring 15b as an urging member having one end fixed in the case, a coil spring 1
Case 1 in which the string 38 connected to the other end of 5b is turned half way
It is composed of a roller 15c pivotally mounted on 5a, and a mounting portion 15e having a hole 15d for screwing to the housing portion 13 of the vertical frame 4. Therefore, the spring unit 15 is attached so that it can be easily attached to and detached from the opening frame A.

The roller 15c converts the moving direction of the string 38 into a substantially right angle direction (horizontal direction and vertical direction) in order to couple the string 38 to the coil spring 15b arranged so that the biasing direction is substantially vertical. It is for doing. By configuring the spring unit 15 as described above, the longitudinal direction of the spring unit 15 can be arranged in the vertical direction, that is, the longitudinal direction of the vertical frame 4 can be aligned, so that the spring unit 15 is installed on the vertical frame 4. In this case, there is an advantage that the space of the vertical frame can be used effectively.

When the spring unit housing 13 is not provided on the rear side of the vertical frame 4, the movable vertical slider 18 has a required length to secure the movement stability. When the frame MJ is moved between the end portions in the direction of opening the screen door, that is, between the vertical frames 4, the leading end of the slider comes into contact with the vertical frame first and is stopped, so the movable vertical frame connected to the slider is moved. May not move until it contacts the vertical frame 4. However, since the spring unit housing 13 is provided on the back side of the vertical frame 4, the slider 18 can move to the upper end of the spring unit housing 13, so that the movable vertical frame moves until it comes into contact with the vertical frame 4. Therefore, there is an advantage that the opening amount of the opening surface can be maximized.

When a sufficient space in the vertical direction can be ensured in the vertical frame 4, the roller 15c is omitted from the spring unit 15 and the coil spring 15b is disposed in the horizontal direction as shown in FIG. It is also possible to configure the spring unit 15A. In this case,
The longitudinal direction of the spring unit 15A is the horizontal direction.

Fitting grooves 6a and 6b are formed at upper and lower ends of the indoor side of the door stop wall 6 of the upper frame 1 so as to face each other, and a slide rail 16 is mounted in these fitting grooves. It is. As shown in FIGS. 7 and 8, the slide rail 16 has concave small ball rolling surfaces 17a, 17
b, a rail 17 extending in the longitudinal direction of the upper frame 1 of the open frame, and concave and small ball rolling surfaces 18a and 18b opposed to the small ball rolling surface of the rail at both upper and lower ends. A short slider 18 and a retainer 20 for rotatably holding small balls 19a and 19b such as a plurality of steel balls for rolling on the small ball rolling surfaces of both rail members while being spaced apart in the longitudinal direction of each rail member. It consists of

The slide rail 16 is attached to the upper frame 1 in advance. After the opening frame A is assembled and attached to the building, the slider 18 of the slide rail 16 is connected to the movable vertical frame MJ of the screen door C via the connection fitting 21. By connecting the upper ends, the upper end of the movable vertical frame MJ is suspended.

Since the slider 18 is fitted to the retainer 20 with a required length, the movable vertical frame MJ is horizontally moved in a direction parallel to the opening surface and in a direction perpendicular to the opening surface. It is possible to move very lightly in the longitudinal direction of the upper frame 1 without swinging, that is, while maintaining a complete vertical state.

The upper end of the connecting metal fitting 21 has the slider 1
8, the movable vertical frame MJ can be easily attached to and detached from the upper frame 1 because the lower end portion is fixed to the outdoor surface of the movable vertical frame MJ with the screw 22b. it can.

At the lower end of the movable vertical frame MJ, as shown in the lower part of FIG. 7, a plastic lower member 23 having at least a part of a sectional shape equal to that of the movable vertical frame MJ is formed on the upper surface thereof. The pair of engaging projections 24 are pushed into the lower end of the movable vertical frame MJ to be integrally connected. An engaging piece 25 is fixed to the indoor side surface of the lower member 23 with a screw 22c. The engaging piece 25 is provided in a state where the engaging portion 25a is fitted in the guide groove 9 of the lower frame 2 in advance when assembling the opening frame A. When the movable vertical frame MJ is attached to the opening frame A, The engagement piece 25 is screwed to the lower member 23.

In this manner, the movable vertical frame MJ can be moved in the longitudinal direction of the upper frame 1 without the upper end thereof being swayed by the slide rail 16, and the lower end is swayed by the engagement piece 25. It is possible to move in the longitudinal direction of the lower frame 2 without performing. That is, even when a force in the opening and closing direction is applied at an arbitrary height, the movable vertical frame always moves vertically in FIG. 1 while maintaining a vertical state.

As shown in FIGS. 3 and 4, the movable vertical frame MJ has a substantially H-shaped cross-sectional shape, and the winding shaft housing groove 2 that opens toward one of the vertical frames 3 with respect to the central web 26.
7 and a web housing groove 28 which opens on the opposite side of the winding shaft housing groove 27 with respect to the web 26. The opening surface of the winding shaft housing groove 27 is shielded by a shielding member 29 fitted and fixed to the movable vertical frame.

As shown in FIG. 9, the shielding member 29 has a pair of ridges 29b, 29c bent in opposite directions on the front and back of a strip 29a having a width substantially equal to that of the web 26.
As shown in FIG. 9, as shown in FIG. 9, the pair of ridges 29 c on the back surface are fixed by being fitted between the tips of a pair of vertical walls forming the winding shaft storage groove 27. . The magnetic plate 30 is fixed at a plurality of predetermined heights between the pair of ridges 29b on the surface.

A winding shaft 31 that is continuous from the upper end to the lower end thereof is rotatably held inside the winding shaft housing groove 27. The upper end is rotatably supported by a bearing 32 provided inside the upper end of the movable vertical frame, and the lower end is rotatably supported by a support shaft 33 protruding from the upper surface of the lower member 23. Further, the winding shaft 31 has an upper end protruding slightly above the upper end of the movable vertical frame, and a pinion 34 is fixed to the protruding portion, and the pinion 34 is provided in the groove 7 of the upper frame 1. Are engaged with a rack 35 extending in the longitudinal direction of the upper frame 1 and attached to the inner surface of the indoor-side hanging wall 7a that forms Therefore, when the movable vertical frame MJ is moved in a direction parallel to the opening surface of the opening frame A, the winding shaft 31 is rotated in the winding direction or the rewinding direction.

The bottom of the mesh storage groove 28 of the movable vertical frame MJ,
That is, a pair of fitting grooves 36 are formed on the winding shaft 31 side as an example, and one vertical edge of a bellows-shaped net 37 is formed so as to be foldable in the fitting grooves. The fixing portion 37a formed in the above can be detachably attached. The pleats 37c of the folded and shortened net can be stored in the net storing groove 28 of the movable vertical frame MJ.

On the other hand, the fixing portion 37b formed by forming the other end of the mesh 37 to be thick is the housing portion 1 of the other vertical frame 4 of the opening frame A.
3 is formed so as to face the opening surface of groove 3.
3a so as to be detachably attached.

The winding shaft 31 has an annular concave portion 31a at a position spaced in the height direction, and a plastic rope or wire rope or the like is formed in a small hole through which the winding shaft passes in the concave portion. Through one end of the string 38,
One end of the string 36 is connected to the winding shaft 31 by connecting a stopper to the tip. Recess 3 of winding shaft 31
1a is for guiding the string at the time of winding the string and for reducing the maximum winding diameter as much as possible. However, a spool may be fixed to the winding portion of the string.

Each of the strings 38 includes a fixing portion 37a of a net 37,
The string is horizontally passed through a small hole formed in the fixing portion 37b and each pleat 37c therebetween, and the other end of the string is free of the spring 15b of the spring unit 15 attached to the housing portion 13 of the vertical frame 4. It is connected to the end. The string 38 has one end wound around the winding shaft 31 and the other end connected to the spring unit 15. Therefore, the cord 38 holds the net 37 in a state where the urging force of the coil spring 15b of the spring unit 15 always acts in the tensioning direction to maintain the tensioned state.

Next, the opening and closing operation of the screen door having the above configuration will be described. Since the movable vertical frame MJ has its upper end suspended from the upper frame 1 by the slide rail 16 and moved, the movable vertical frame MJ can be moved in a direction parallel to the opening surface of the opening frame A or in a direction perpendicular to the opening surface. , Swinging is effectively prevented. In addition, the lower end of the movable vertical frame MJ is similarly prevented from swinging in a direction parallel to and perpendicular to the opening surface of the opening frame by the engagement piece 25. Therefore, even when the movable vertical frame MJ is provided with an opening / closing force at an arbitrary height, the movable vertical frame MJ always maintains a vertical state and smoothly moves in a direction parallel to the opening surface.

When the movable vertical frame MJ is moved to the left in FIG. 1, the net 37 is extended and the screen door is closed as shown in FIG. When the closing member 29 approaches the closing member 14 of the vertical frame 3, the magnetic plate 30 is attracted to the magnet MG, and is fixed in the closed state. When the movable vertical frame MJ is moved to the right, the net 37 is shortened and the screen door is opened as shown in FIG. Therefore, it is possible to open the door B and freely pass through the entrance.

The take-up shaft 31 is rotated by the action of the pinion 34 and the rack 35 along with the movement of the movable vertical frame MJ. In FIG. 3, when moving the movable vertical frame MJ to the right, the winding shaft 31 is rotated in the winding direction according to the amount of movement, and the string 38 is wound. Therefore, no matter where the movable vertical frame MJ exists, the string 38 always maintains a tensioned state and prevents the net from becoming loose. On the other hand, in FIG.
Is moved to the left, the winding shaft 31 is similarly rotated in reverse according to the amount of movement, and the string 38 is rewound from the winding shaft. Since the other end of the string is connected to the spring 15b, even if there is a slight difference between the amount of movement of the movable vertical frame MJ and the amount of rotation of the winding shaft 31, the string is always in a required tension. Maintain the condition to prevent the net from loosening. In addition, the movable vertical frame MJ
Is smoothly moved while maintaining a completely vertical state by the slide rail 16, so that the meshing state of the pinion 34 and the rack 35 does not collapse, so that the winding shaft 31 is moved in accordance with the movement of the movable vertical frame MJ. Since it is reliably rotated, only a part of the string is not loosened.

The engagement piece 25 for guiding the lower end of the movable vertical frame MJ so as to be movable in the longitudinal direction of the lower frame 2 is used to support the lower end of the winding shaft 31 as described above. In addition to being detachably attached to the lower member 23, it may be detachably attached directly to the lower end of the movable vertical frame MJ. Also,
The engagement portion 25a of the engagement piece 25 may be formed by a roller.
Further, the guide member of the lower frame 2 is not limited to the groove 9. Engagement piece 2
5 may be of any shape that guides it in the longitudinal direction of the lower frame.

When the area covered by the mesh on the opening surface of the opening frame is variously different, meshes having different widths are used, and therefore, the width in the shortened state (distance between the left and right edges) is also different. A movable vertical frame having a different depth of the net storage groove 33 according to the width of the net is used.

When the slide rail 16 and the engagement piece 25 are detachably connected to the movable vertical frame MJ by screwing or the like as in the above embodiment, the slide rail 16 and the engagement piece 25 Has the advantage that any movable vertical frame having a different mesh storage groove depth can be mounted in the same manner using the same one.

Next, the operation of removing the movable vertical frame MJ, the string 37, and the net 38 from the opening frame A in the maintenance of the screen door will be described. First, as shown in FIG. 4, the screen door C is closed, that is, the screen 37 is moved to the movable vertical frame MJ.
In the net storage groove 33 of FIG. In this state,
As described above, the string 38 is wound around the winding shaft 31. As shown in FIG. 5 or FIG.
Remove the screw 15d connecting 5 to the vertical frame 4. Next, as shown in FIG. 4, the fixing portion 37 b formed of the thick net 37 is removed from the groove 13 a of the vertical frame 4 of the opening frame A.
Next, as shown in FIG. 7, the screw 22c connecting the lower part of the movable vertical frame MJ to the engagement piece 25 is removed. Further, FIG.
As shown in (5), the screw 22c connecting the upper part of the movable vertical frame MJ to the connection fitting 21 is removed. Thereby, the engagement between the rack 35 of the opening frame A and the pinion 34 on the movable vertical frame MJ side can be released to separate them. As described above, the string 37 and the net 38 are wound and stored in the movable vertical frame MJ by a very simple operation, that is, the movable vertical frame MJ.
The J, the string 37, and the net 38 can be removed from the opening frame A while being integrally connected. For this reason, handling is easy and work is easy.

In this state, since the spring unit 15 is still connected to the end of the string 37,
Can be prevented from inadvertently dropping out of the through hole of the net 38. Therefore, there is an advantage that the efficiency of maintenance work performed later can be improved. When the string 37 is pulled out from the net 38,
The connection of one end of the string 37 from the spring unit 15 or the connection of the other end of the string 37 from the winding shaft 31 may be released, and this operation is extremely easy. Also,
The operation of attaching the movable vertical frame MJ, the string 37, and the net 38, to which the maintenance has been completed, to the opening frame A may be performed in substantially the reverse order of the above-described operation, and is extremely easy as in the above-described removal operation.

Further, although the above embodiment is applied to the entrance, the present invention can also be applied to a window similarly, and has the same effect.

The method of fixing the spring unit 15 to the vertical frame 4 may be such that a fitting portion capable of holding the case 15a in a detachable manner is provided on the vertical frame 4 in addition to the fixing by the screw shown in this embodiment. Good. Also, the coil spring 15 of the spring unit 15
The b and the string 38 may be detachably connected to each other by a well-known hook-shaped connection fitting or the like. In this case, there is no need to attach and detach the spring unit 15. Further, instead of the spring unit 15, a coil spring that is stretched in the horizontal direction is used as the tensioning means, and one end of the coil spring is fixed to the vertical frame 4 and the other end is detachably attached to the string 38 by a well-known connection fitting or the like. May be combined.

[0043]

As described above in detail, according to the screen door of the present invention, the movable vertical frame, the string and the net are detachably attached to the opening frame while being integrally connected, and Since the string is wound on the winding shaft in the movable vertical frame, the movable vertical frame,
Because the attachment and detachment operation of the string and the net is easy,
Installation and maintenance of the screen door to the opening frame are facilitated.

When the other end of the string is connected to a tensioning means detachably provided on the opening frame, the other end of the string can be easily fixed to the vertical frame. Further, when the screen door is removed from the opening frame, the other end of the string is prevented from coming off the screen, so that the maintenance work can be performed smoothly.

A roller for changing the direction of movement of the cord to a substantially right angle direction is pivotally attached to the tensioning means, and the cord is held in a horizontal direction through the net, and is also moved vertically through the roller. When the tension member is connected to the other end of the urging member disposed along the longitudinal direction, the longitudinal direction of the tension member can be disposed along the longitudinal direction of the opening frame, so that the installation space for the tension member can be saved.

Further, when a storage groove is provided in the indoor portion of the vertical frame so as to open in the direction of the other vertical frame, and when the case of the tension means is stored and mounted in the storage groove, the tension means may be attached to the indoor side. The appearance of the opening to which the telescopic door is attached is prevented from lowering.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a screen door of the present invention,
This shows a state as viewed from the indoor side of the entrance where the screen door is attached.

FIG. 2 is a longitudinal sectional view taken along line XX of FIG.

FIG. 3 is a cross-sectional view in a state where a screen door is closed.

FIG. 4 is a cross-sectional view in a state where a screen door is opened.

FIG. 5 is a longitudinal sectional view showing a configuration of a spring unit.

FIG. 6 is a longitudinal sectional view showing a modification of the configuration of the spring unit.

FIG. 7 is an exploded perspective view of a main part showing a connection structure of a movable vertical frame to an opening frame.

FIG. 8 is a side view mainly showing a slide rail.

FIG. 9 is an exploded cross-sectional view of one vertical frame and a movable vertical frame of the opening frame.

FIG. 10 is a front view showing an example of a conventional telescopic door.

[Explanation of symbols]

 Reference Signs List A Opening frame 1 Upper frame 2 Lower frame 3, 4 Vertical frame 9 Guide member C Screen door MJ Movable vertical frame 15 Spring unit (tensing means) 15a Case 15b Coil spring (biasing member) 15c Roller 16 Slide rail 25 Engagement piece 31 winding Spindle 37 Net 37a, 37b Vertical edge 38 String

Claims (4)

(57) [Claims] 1. One of the longitudinal edges of the foldable net is up,
The lower end portion is fixed to a movable vertical frame moved along the lower frame above the opening frame, the other vertical edge of the net is fixed to one vertical frame of the opening frame, and the movable vertical frame and the movable vertical frame are fixed to each other. In a screen door which holds the net between the vertical frames so as to be extendable and contractible in parallel with the opening surface of the opening frame, a rail extending in a longitudinal direction of the upper frame of the opening frame, and a rail fitted to the rail. And a slide rail having a slider that slides in its longitudinal direction.
An upper end portion of the movable vertical frame is detachably attached to a slider of the slide rail via a connection fitting.A lower frame of the opening frame is provided with a guide member extending in a longitudinal direction thereof. A plurality of strings each having one end detachably fixed to one of the vertical frames of the opening frame detachably connected to an engagement piece movably engaged in a longitudinal direction to a lower end portion of the movable vertical frame. And the other end of the string is coupled to a winding shaft rotatably provided in the movable vertical frame, and the winding shaft rotates forward according to the movement of the movable vertical frame. Or, by being reversed, the string is taken up or unwound, and the other vertical edge of the net is detachably fixed to one of the vertical frames of the opening frame. Screen door. 2. The screen door according to claim 1, wherein one end of the string is connected to a tensioning means for constantly applying a biasing force to the string in a tensioning direction, and the tensioning means is provided on one side of the opening frame. A screen door, comprising: a case detachably attached to a frame; and a biasing member housed in the case, one end of which is fixed, and a free end of which is connected to one end of a cord. 3. The screen door according to claim 2, wherein the tensioning means pivots a roller near the entrance of the case to change the direction of movement of the string to a substantially right angle direction, and connects one end of the string via the roller. And a screen door, which is connected to a free end of a biasing member which expands and contracts in a vertical direction. 4. A screen door according to claim 2, wherein a storage groove is provided in the indoor portion of the vertical frame so as to open in the direction of another vertical frame, and a case of the tensioning means is stored and mounted in the storage groove. A screen door characterized by the following.