Insect-proof net, window screen device using the same, and method for attaching and detaching insect-proof net

Abstract

To provide an insect screen that can be easily attached to a mounting frame without requiring strict dimensional accuracy and with no sagging or wrinkling of a netting material, a screen door device using the same, and a method for attaching and detaching the insect screen.SOLUTION: An insect screen 10 is designed to be fastened to a hollow vertical frame rod 41 in a building opening. The insect screen has a rectangular, flexible netting member 11 having left and right vertical sides and upper and lower horizontal sides, and a first engagement body 13 attached to each of the left and right vertical sides of the netting member. The first engagement body has an engagement base 14 whose base side is attached to the netting member, and a pair of engagement pieces 15,15 standing from both sides of the tip side of the engagement base for engaging the engagement body to a netting mounting frame while being accommodated in a frame through a slit-like opening 41b. The pair of engagement pieces extend in a direction away from each of the two sides of the engagement base as they progress from the tip side at each of the sides of the engagement base to the base side.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to an insect screen for locking to a net mounting frame provided at a building opening, a net door device formed by attaching the insect screen to the net mounting frame, and a method for attaching and detaching the insect screen. In particular, the present invention relates to an insect screen that can be attached without slack while applying an appropriate tension to the net material, a net door device using the same, and a method for attaching and detaching the insect screen.

Background Art

[0002] In an insect screen that can lock a net material to a net mounting frame (mounting frame) provided at a building opening while applying an appropriate tension to the net material, for example, the insect screen described in Patent Document 1 attaches rod-shaped fixing members to two of the upper, lower, left, and right sides of the net material, and by pushing this fixing member into the mounting groove of the mounting frame and locking it, two sides are fixed to the mounting frame. And for the other two sides, in a state where these are inserted into the mounting groove, by elastically pushing a clamping member into the mounting groove, they are clamped between the clamping member and the net material mounting frame. Therefore, the net material is stretched on the net material mounting frame.

[0003] However, the insect screen described in Patent Document 1 requires the net material to be accurately cut to a size that matches the dimensions of the mounting frame. If this dimension is not accurate, minute dimension adjustment becomes impossible, and it is difficult to stretch the net material on the mounting frame without slack or wrinkles. Further, the insect screen described in Patent Document 1 requires labor for attaching and detaching the fixing member to and from the mounting frame.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technical problem of the present invention relates to an insect-proof net that can be easily attached to an attachment frame without requiring strict dimensional accuracy and without slack or wrinkles in the net material, a screen door device using the same, and a method for attaching and detaching the insect-proof net.

Means for Solving the Problems

[0006] To solve the above technical problem, the insect-proof net according to the present invention is an insect-proof net for locking to a hollow net attachment frame provided in a building opening, and the insect-proof net includes a rectangular and flexible net material having left and right vertical sides and upper and lower horizontal sides, and first locking bodies respectively attached to the left and right vertical sides or the upper and lower horizontal sides of the net material. The first locking body has a locking base portion to which the base end is attached to the net material, and a pair of locking piece portions that are erected from both side surfaces of the tip of the locking base portion and are engaged with the net attachment frame in a state of being accommodated through a slit-shaped opening in the net attachment frame. The pair of locking piece portions extend in a direction away from each of the both side surfaces as they proceed from the tip to the base end side on each of the both side surfaces of the locking base portion. Part and a locking base portion to which the base end is attached to the net material, and the tip of the locking base portion Part has a pair of locking piece portions that are erected from both side surfaces and are engaged with the net attachment frame in a state of being accommodated through a slit-shaped opening in the net attachment frame. has elasticity and The pair of locking piece portions are provided at the tips on each of the both side surfaces of the locking base portion Part and extend in a direction away from each of the both side surfaces as they proceed from the tip to the base end Part side on each of the both side surfaces of the locking base portion. is and The pair of locking piece parts are connected such that the tip ends thereof are slidably in contact with the inner surface of the net mounting frame, and the inclination angle can be changed with respect to the locking base part. Thereby, a tension is applied to the net material by the elastic restoring force of the pair of locking piece parts. is characterized in that.

[0007] In this case, preferably, the first locking body is continuously provided across both ends in the longitudinal direction of each of the left and right vertical sides or the upper and lower horizontal sides of the net material.

[0008] Also, preferably, the pair of locking piece portions are symmetrically arranged with the locking base portion interposed therebetween. Further, preferably, each of the pair of locking piece portions extends with an acute angle formed with respect to the locking base portion. Also, preferably, the pair of locking piece portions have the same length and cross-sectional shape.

[0009] Further, the screen door device according to the present invention is a screen door device formed by attaching the insect-proof screen according to any one of claims 1 to 5 to the screen mounting frame provided in the building opening, wherein the screen mounting frame has a pair of support frame bars disposed opposite to the first locking bodies respectively attached to the left and right vertical sides or the upper and lower horizontal sides of the screen material, and the support frame bars are disposed opposite to the first locking bodies inside a wall, an opening formed in the inner wall, and a concave groove communicating with the opening, and the first locking body in the insect-proof screen is accommodated in the concave groove through the opening of the support frame bar. This is the feature.

[0010] In this case, more preferably, the pair of support frame bars are detachably attached to the building opening.

[0011] Also preferably, the screen mounting frame has a pair of side frame bars extending between one end and the other end in the longitudinal direction of each of the pair of support frame bars, and second locking bodies are attached to each of the left and right vertical sides or the upper and lower horizontal sides of the screen material where the first locking body is not attached, and the second locking bodies are detachably attached to the side frame bars.

[0012] Further, the method for attaching and detaching the insect-proof screen according to the present invention is a method for attaching and detaching the insect-proof screen of the screen door device according to claim 8 to and from the screen mounting frame. When removing the insect-proof screen attached to the screen mounting frame, after removing the second locking body from the side frame bar, remove the pair of support frame bars from the building opening, and then slide the insect-proof screen relative to the pair of support frame bars and remove it from one end in the longitudinal direction of the pair of support frame bars. When attaching the insect-proof screen to the screen mounting frame, slide the insect-proof screen onto the pair of support frame bars and then attach the pair of support frame bars to the building opening, and then attach the second locking body to the side frame bar.

Advantages of the Invention

[0013] As described above, according to the present invention, it is possible to provide an insect-proof net that can be easily attached to an attachment frame without requiring strict dimensional accuracy and without the net material being loose or wrinkled, a screen door device using the same, and a method for attaching and detaching the insect-proof net.

Brief Description of the Drawings

[0014]

Figure 1

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Figure 8

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Figure 14

Embodiments for Carrying Out the Invention

[0015] Figures 1 and 2 show an example of a screen door device 1 in which an insect-proof net 10 according to the present invention can be easily attached to a net mounting frame 40 (mounting frame) provided in a building opening W in a state where the net material 11 has no slack or wrinkles.

[0016] As shown in FIGS. 1 and 2, the building opening W is configured as a sliding window, and an aluminum alloy sash 60 is attached to the building opening W. A shoji 70 is attached to the sash 60, and by operating the handle 71, the shoji 70 is pushed out to the outdoor side to open the building opening W. The sash 60 is attached to a mounting portion 72 formed at an indoor side position, and a net mounting frame 40 is provided at an outdoor side position of the sash 60. Note that the place where the insect-proof net 10 is attached is not limited to such a sliding window, and it can also be attached to various windows that open and close the shoji 70 by handle operation, such as a casement window or a projecting window.

[0017] The net mounting frame 40 is formed in a rectangular shape by combining left and right vertical frame bars (support frame bars) 41, 41 having a square tube-shaped cross section and upper and lower horizontal frame bars 50, 50 (side frame bars) having a U-shaped cross section. In the present embodiment, the vertical frame bar 41 is detachably attached to the sash 60, and the horizontal frame bar 50 is formed on the sash 60.

[0018] The insect-proof net 10, although details will be described later, is attached to the net mounting frame 40 by locking the left and right first locking bodies 13 and the upper and lower second locking bodies 20 of the insect-proof net 10 into concave grooves 41a, 50a (FIG. 10, Figure 11 ) formed in the left and right vertical frame bars 41, 41 and the upper and lower horizontal frame bars 50, 50 of the net mounting frame 40, respectively. In the following description, "upper and lower" and "left and right" refer to the directions when the building opening W is viewed from the indoor side, and "front" is the outdoor side and "rear" is the indoor side.

[0019] As shown in FIGS. 3 to 5, the insect net 10 includes a flexible net material 11 in a rectangular shape having left and right vertical sides 11a, 11a and upper and lower horizontal sides 11b, 11b, and a first locking body 13 and a second locking body 20 respectively attached to the left and right vertical side portions 11a1 and the upper and lower horizontal side portions 11b1 of the net material 11.

[0020] The net material 11 can be formed using fibers such as chemical fibers and metal fibers. Preferably, it is formed of chemical fibers such as polyester, polypropylene, and glass fiber, similar to the net material 11 in a normal screen door. In the illustrated example, the length of the net material 11 in the vertical direction (up and down direction) is formed longer than the length in the horizontal direction (left and right direction). That is, the length of the vertical side of the net material 11 is longer than the length of the horizontal side.

[0021] As shown in FIG. 4(b), the first locking body 13 is made of a synthetic resin material and has elasticity. It includes a locking base portion 14 attached to the left and right vertical side portions 11a1 of the net material 11, and a pair of locking piece portions 15 extending from both side surfaces 14a of the locking base portion 14 in a direction away from the side surfaces 14a as they proceed toward the net material 11 side. The locking base portion 14 has a rectangular shape continuously extending between the upper end and the lower end of the net material 11, and is fixed to the side surface of the vertical side portion 11a1 of the net material 11 by welding or the like.

[0022] As shown in FIG. 3, the pair of locking piece portions 15, 15 are formed between a position below the upper end of the net material 11 and a position above the lower end of the net material 11, and are shorter in the vertical direction than the locking base portion 14. As shown in FIGS. 4(b) and 6, these locking piece portions 15, 15 are symmetrically arranged with the locking base portion 14 interposed therebetween, and have an acute angle with respect to the locking base portion 14 (hereinafter referred to as "bending angle θ").

[0023] Further, these locking piece portions 15, 15 extend orthogonally to the locking base portion 14 from the tip end portions on the side connected to the locking base portion 14 and bend toward the net member 11 side. That is, the locking piece portions 15, 15 are configured to have a locking piece base portion 15a extending orthogonally to the locking base portion 14 and an arm portion 15b extending in an oblique direction from the locking piece base portion 15a, and the length L2 of the locking piece base portion 15a is formed shorter than the arm portion 15b. For this reason, the arm portion 15b can be elastically deformed in the direction of separating from and approaching the locking base portion 14 (front-rear direction) with the connection position P1 with the locking piece base portion 15a as a fulcrum, while the locking piece base portion 15a has enhanced rigidity and relatively small elastic deformation in the left-right direction.

[0024] Further, the arm portions 15b of these locking piece portions 15 have the same longitudinal length L1 and cross-sectional shape. In the present embodiment, the cross-section of the arm portion 15b is formed in a rectangular shape. For this reason, as shown in FIGS. 6 and 7, these locking piece portions 15, 15 are elastically deformed according to the lateral dimension (left-right dimension) of the net member 11 to apply a tension force (tension) to the net member 11. The detailed operation of the first locking body 13 will be described later.

[0025] Further, as shown in FIG. 8, when the arm portion 15b Locking piece base 15a is deformed to a position extending in the same straight line, that is, when the arm portion 15b is bent in a direction orthogonal to the locking base portion 14, since the rigidity of the locking piece base portion 15a is enhanced, even if the net member 11 is pulled in the direction indicated by the arrow C, the locking piece base portion 15a is less likely to be elastically deformed. For this reason, it is possible to prevent the first locking body 13 from being removed from the opening 41b of the vertical frame rod 41 of the net mounting frame 40. The details of the vertical frame rod 41 will be described later.

[0026] Next, the accommodation recess 62 for mounting the left and right vertical frame bars 41, 41 will be described. As shown in FIGS. 2 and 6, the accommodation recess 62 is formed in the side walls 61, 61 on both the left and right sides of the sash 60. The side wall 61 extends on the same plane as the inner surface 72a of the attachment portion 72, and an accommodation recess 62 that is recessed outward in the left-right direction is formed in this side wall 61. The accommodation recess 62 is formed in a rectangular shape in plan view, opens to the net material 11 side, and extends in the vertical direction. The accommodation recess 62 has a bottom plate 63 disposed at the bottom, and a pair of side plates 64, 64 that extend inward in the left-right direction from both ends of the bottom plate 63, and an opening 62a is formed on the side opposite to the bottom plate 63. Inside the accommodation recess 62, a concave groove 65 that is surrounded by the bottom plate 63 and the side plates 64, 64 and extends in the vertical direction is formed.

[0027] As shown in FIG. 9, the accommodation recess 62 extends in the vertical direction between a position exceeding the lower end of the vertical frame bar 41 and a position exceeding the upper end. That is, the accommodation recess 62 is longer than the vertical length of the vertical frame bar 41 in the vertical direction.

[0028] As shown in FIG. 6, locking protrusion portions 66, 66 are formed on the inner surfaces of the side plates 64, 64 of the accommodation recess 62. The locking protrusion portions 66, 66 protrude into the concave groove 65, and a stepped portion 67 that extends into the concave groove 65 is formed on the opening 62a side of the accommodation recess 62 of the locking protrusion portions 66, 66. This stepped portion 67 is formed in a plate shape extending in the vertical direction, and when the flange portion 43c of the vertical frame bar 41 described later abuts against the stepped portion 67, the vertical frame bar 41 is positioned in the left-right direction with respect to the accommodation recess 62.

[0029] Next, the vertical frame bar 41 will be described. As shown in FIGS. 2 and 6, the vertical frame bar 41 is a rod-shaped member that extends in the vertical direction and is detachably inserted into the accommodation recess 62. The vertical frame bar 41 is formed of, for example, a synthetic resin material, and has an inner wall 42 through which the first locking body 13 is inserted, a pair of side walls 43, 43 that extend from both sides of the inner wall 42 toward the bottom plate 63 side of the accommodation recess 62, and a bottom wall 44 that connects the ends of these side walls 43, 43 on the bottom plate 63 side, and is formed in a rectangular shape in a cross-sectional view. Inside the vertical frame bar 41, a concave groove 45 surrounded by the inner wall 42, the side walls 43, 43, and the bottom wall 44 is formed, and a part of the first locking body 13 is accommodated in this concave groove 45.

[0030] In the central portion in the width direction of the inner wall 42, an opening 41b into which the first locking body 13 is inserted is formed. The opening 41b is formed in a slit shape extending between the lower end and the upper end of the inner wall 42. In the present embodiment, the opening 41b is formed in an elongated rectangular shape extending in the vertical direction. The width d of the opening 41b is substantially the same as twice the length L2 (see FIG. 4(b)) of the locking piece base portion 15a of the first locking body 13 described above. For this reason, it is difficult for the first locking body 13 to be removed from the opening 41b.

[0031] On the inner edge portion of the opening 41b, a locking and unlocking prevention protrusion portion 42a that protrudes into the concave groove 45 is provided to prevent the arm portions 15b, 15b of the first locking body 13 from moving into the opening 41b. Further, on the outer peripheral edge of the opening 41b, a locking and unlocking protrusion portion 42b that protrudes from the inner wall 42 toward the net material 11 side and bends toward the indoor side is provided. When removing the vertical frame rod 41 from the accommodation recess 62, the locking and unlocking protrusion portion 42b is hooked and pulled by a fingertip, a driver, or the like. The locking and unlocking protrusion portion 42b may be provided continuously in the vertical direction on the outer surface of the inner wall 42, or a plurality of them may be provided at intervals.

[0032] On the end portions of the left and right side walls 43, 43 of the vertical frame rod 41 on the side opposite to the bottom wall 44, a flange portion 43c that protrudes outward is formed. The flange portion 43c extends in the vertical direction. Further, on the side of the bottom wall 44 rather than the flange portions 43c of the left and right side walls 43, 43, a locked protrusion portion 43a that engages with the locking protrusion portion 66 formed in the accommodation recess 62 of the sash 60 is formed. The locked protrusion portion 43a has a first inclined surface 43b that inclines toward the locking protrusion portion 66 side as it advances toward the bottom wall 44 side. When the vertical frame rod 41 is inserted into the accommodation recess 62, the flange portion 43c of the vertical frame rod 41 abuts against the step portion 67 of the locking protrusion portion 66 and the locking protrusion portion 66 abuts against the first inclined surface 43b, so that the vertical frame rod 41 is locked in a state of being positioned with respect to the accommodation recess 62.

[0033] Note that, as shown in FIG. 7, a second inclined surface 66a that inclines toward the vertical frame rod 41 is formed at the tip of the locking ridge portion 66. Further, third inclined surfaces 44a and fourth inclined surfaces 44b that incline along the second inclined surface 66a are formed on both sides in the width direction of the bottom wall 44 of the vertical frame rod 41. Therefore, when inserting the vertical frame rod 41 into the accommodation recess 62, the left and right side walls 43, 43 elastically deform inward while the third inclined surface 44a and the fourth inclined surface 44b come into contact with the second inclined surfaces 66a, 66a of the locking ridge portions 66, 66 and move into the accommodation recess 62. Thus, the vertical frame rod 41 can be easily inserted into the accommodation recess 62.

[0034] Next, the second locking body 20 provided above and below the net material 11 will be described. As shown in FIGS. 1, 3, 5(a), and 5(b), the second locking body 20 uses a fastener, which is a type of fastener, and is formed by attaching one engaging band 23 of a fastener composed of a pair of engaging bands 23, 23 in which small pieces (elements) 21 that mesh with each other are attached to the edges of two cloth tapes 22, to the upper and lower horizontal side portions 11b1 of the net material 11. More specifically, the cloth tape 22 of the engaging band 23 is attached along the side surface of the horizontal side portion 11b1, and a plurality of small pieces 21 are arranged along the horizontal side 11b of the net material 11.

[0035] Note that the second locking body 20 is not limited to the fastener described above, and other types may be used. For example, it may be a tape made of cloth or synthetic resin provided with intermittent protrusions, continuous ridges, or the like.

[0036] Next, the horizontal frame bar 50 and the net material engaging member 25 for locking the second locking body 20 to the sash 60 will be described. As shown in FIGS. 1, 11, and 12, the horizontal frame bar 50 is formed to be recessed in the upper plate 68 and the bottom plate 69 of the sash 60. The horizontal frame bar 50 is formed of a synthetic resin material and has a bottom plate 51 extending in the left-right direction and a pair of side plates 52, 52 extending from both sides in the width direction (front-rear direction) of the bottom plate 51 toward the net material 11 side, and is formed in a U-shaped cross section. Inside the horizontal frame bar 50, a concave groove 50a surrounded by the bottom plate 51 and the side plates 52, 52 is formed, and an opening 50c is formed on the net material 11 side of the pair of side plates 52, 52. The concave groove 50a and the opening 50c extend in the left-right direction. On the inner surfaces of these side plates 52, 52, locking protrusion portions 50b, 50b protruding into the locking concave groove 50a are formed.

[0037] The net material engaging member 25 has a bottom plate 26 extending along the opening 50c of the horizontal frame bar 50 and two engaging pieces 27, 27 protruding from the inner surface of the bottom plate 26 toward the bottom plate 51 side of the horizontal frame bar 50. These engaging pieces 27, 27 are arranged in parallel with a space therebetween, and on these engaging pieces 27, 27, a locked portion 27a for engaging with the locking protrusion portion 50b provided on the horizontal frame bar 50 to lock the net material engaging member 25 to the horizontal frame bar 50 is provided. On both sides of the bottom plate 26, flange portions 26a extending along the locking protrusion portion 50b are formed. When the net material engaging member 25 is inserted into the concave groove 50a, the locked portion 27a comes into contact with the locking protrusion portion 50b, and the engaging pieces 27, 27 elastically deform inward while the net material engaging member 25 moves into the concave groove 50a. Then, when the flange portion 26a abuts against the locking protrusion portion 50b, the locked portion 27a is locked to the locking protrusion portion 50b. When removing the net material engaging member 25 from the horizontal frame bar 50, a driver or the like is inserted between the flange portion 26a and the locking protrusion portion 50b to pull out the net material engaging member 25 from the horizontal frame bar 50.

[0038] The net material 11 is held at the upper and lower end portions of the net material 11 by the horizontal frame bar 50 when the net material 11 connected to the second locking body 20 is sandwiched between the locking protrusion portion 50b of the horizontal frame bar 50 and the locked portion 27a of the net material engaging member 25 in a state where the second locking body 20 is accommodated in the concave groove 50a.

[0039] In the screen door device 1 configured as described above, the case of removing the insect screen 10 from the sash 60 will be described. First, the net material engaging member 25 attached to the upper and lower horizontal frame bars 50 shown in FIGS. 1 and 11 is removed from the horizontal frame bar 50. Accordingly, the second locking body 20 of the insect screen 10 becomes free with respect to the horizontal frame bar 50. Then, the vertical frame bar 41 into which the first locking bodies 13 provided on the left and right of the insect screen 10 shown in FIG. 2 are inserted is removed from the housing recess 62 of the sash 60. When removing the vertical frame bar 41, the engaging and disengaging protrusion 42b shown in FIG. 6 is pulled inward to remove the vertical frame bar 41 from the housing recess 62. When the vertical frame bar 41 is removed from the housing recess 62, the net material 11 bends because it has flexibility. Therefore, the removal operation of the vertical frame bar 41 from the housing recess 62 can be easily performed. Then, the insect screen 10 is slid with respect to the vertical frame bars 41, 41 to remove the insect screen 10 from the vertical frame bars 41, 41.

[0040] Next, the case of attaching the insect screen 10 to the screen mounting frame 40 will be described. First, the first locking bodies 13 attached to the left and right vertical side portions 11a1, 11a1 of the insect screen 10 shown in FIG. 3 are inserted into the groove 41a from the opening at one end in the longitudinal direction of the vertical frame bar 41 as shown in FIG. 10, and slid to the other side in the longitudinal direction. As a result, the vertical frame bars 41 are attached to both the left and right sides of the insect screen 10.

[0041] Then, as shown in FIG. 2, each of the left and right vertical frame bars 41, 41 is inserted into the housing recess 62 of the sash 60. When the left and right vertical frame bars 41, 41 are inserted into the corresponding housing recesses 62, as shown in FIGS. 6 and 7, according to the dimensional accuracy of the net material 11 in the left-right direction, each of the pair of locking piece portions 15, 15 of the first locking body 13 bends with respect to the locking base portion 14, and the bending angle θ changes. Therefore, even when the dimensions in the left-right direction at arbitrary positions in the up-down direction of the net material 11 are different, the reaction force (tension) of the elastic force pressing the inner surface of the inner wall 42 due to the bending of these locking piece portions 15, 15 acts on both the left and right sides of the net material 11 via the locking base portion 14. For this reason, the net material 11 is stretched in a tension state without slack or wrinkles over the entire up-down direction between the left and right vertical frame bars 41, 41.

[0042] Then, as shown in FIGS. 1 and 11, the cloth tapes 22, 22 of the second locking bodies 20, 20 attached above and below the netting material 11 are inserted into the concave grooves 50a of the horizontal frame bars 50, 50 formed above and below the sash 60. Then, when the netting engagement member 25 is inserted into the concave groove 50a and the netting engagement member 25 is locked to the horizontal frame bar 50, the cloth tape 22 of the second locking body 20 is sandwiched between the horizontal frame bar 50 and the netting engagement member 25. As a result, both upper and lower end portions of the netting material 11 are held by the upper and lower horizontal frame bars 50, 50.

[0043] As described above, in the net window device 1 of the present embodiment, the first locking bodies 13 attached to the left and right vertical side portions 11a1 of the insect screen 10 have a pair of locking piece portions 15, 15 that can be elastically deformed, and these locking piece portions 15, 15 bend according to the accuracy of the left-right dimension of the netting material 11. Then, the reaction force of the elastic force generated by the bending of these locking piece portions 15, 15 acts on the netting material 11 as a tension force. Therefore, even when strict dimensional accuracy is not required for the left-right dimension of the netting material 11, the netting material 11 can be stretched between the vertical frame bars 41, 41 in a tension state without slack or wrinkles. Further, the netting material 11 can be slidably moved and attached to the vertical frame bars 41, 41, and furthermore, the vertical frame bars 41, 41 can be detachably attached to the accommodation recess 62 of the sash 60. Therefore, the insect screen 10 can be easily attached to and detached from the vertical frame bars 41, 41.

[0044] Further, the pair of locking piece portions 15, 15 are continuously provided along the vertical side 11a of the netting material 11, and even when the left-right dimensional accuracy of the vertical side 11a of the netting material 11 is not uniform, the tension force by the pair of locking piece portions 15, 15 acts on the vertical side 11a according to the dimension. Therefore, it is possible to prevent the vertical frame bar 41 from deforming into a drum shape as compared with the case where a uniformly distributed load acts over the entire area of the vertical side 11a.

[0045] Incidentally, in the above-described embodiment, the net attachment frame 40 is shown as having the vertical frame bar 41 detachably attached to the sash 60 and the horizontal frame bar 50 formed on the sash 60, but it is not limited thereto. The net attachment frame 40 Figure 13 and Figure 14As shown in , it may be provided on the movable frame 76 attached to the sash 75 (Modification 1).

[0046] In this case, on the indoor side of the sash 75, a sliding window having two shoji screens 70 movable in the left - right direction is provided, and on the outdoor side of the sash 75, an insect - proof net 10 movable in the left - right direction is provided. The insect - proof net 10 is formed to be large enough to cover the window that opens in a state where the two shoji screens 70, 70 overlap each other. The movable frame 76 has accommodation recesses 62 on both its left and right sides where the vertical frame bars 41 can be detachably attached, and horizontal frame bars 50 are formed on both the upper and lower sides of the movable frame 76.

[0047] Then, the first locking bodies 13 attached to the left and right of the net material 11 are inserted into the vertical frame bars 41, and the vertical frame bars 41 are attached to the accommodation recesses 62. Also, the second locking bodies 20 attached to the upper and lower sides of the net material 11 are clamped and locked between the horizontal frame bar 50 and the net - engaging member 25 inserted therein.

Explanation of Reference Numerals

[0048] 1 Window screen device 10 Insect - proof net 11 Net material 11a Vertical side 11b Horizontal side 13 First locking body 14 Locking base 15 Locking piece part 20 Second locking body 40 Net - mounting frame 41 Vertical frame bar (support frame bar) 41a Groove 41b Opening 42 Inner wall 50 Horizontal frame bar (side frame bar) W Building opening

Claims

1. An insect screen for locking to a hollow screen mounting frame provided at a building opening, wherein the insect screen comprises a rectangular and flexible screen material having left and right vertical sides and upper and lower horizontal sides, and first locking bodies respectively attached to the left and right vertical sides or the upper and lower horizontal sides of the screen material, wherein the first locking body has a locking base portion to which a base end portion is attached to the screen material, and a pair of locking piece portions that are erected from both side surfaces of the tip end portion of the locking base portion and are engaged with the screen mounting frame in a state of being accommodated through a slit-shaped opening in the screen mounting frame, wherein the pair of locking piece portions are elastic and extend in a direction away from each of the both side surfaces as they proceed from the tip end portions toward the base end portion side on each of the both side surfaces of the locking base portion, wherein the pair of locking piece portions are slidably abutted against the inner surface of the screen mounting frame at their respective tip end portions and are connected so that the inclination angle can be freely changed with respect to the locking base portion, whereby a tension is applied to the screen material by the elastic restoring force of the pair of locking piece portions, characterized in that it is an insect screen.

2. The first locking body is continuously provided across both ends in the longitudinal direction of each of the left and right vertical sides or the upper and lower horizontal sides of the screen material, characterized in that it is the insect screen according to claim 1.

3. The pair of locking piece portions are symmetrically arranged with the locking base portion therebetween, characterized in that it is the insect screen according to claim 2.

4. The pair of locking piece portions each extend with an acute angle formed with respect to the locking base portion, characterized in that it is the insect screen according to claim 3.

5. The pair of locking piece portions have the same length and cross-sectional shape, characterized in that it is the insect screen according to claim 4.

6. A screen door device formed by mounting the insect screen according to any one of claims 1 to 5 on the screen mounting frame provided at the building opening, wherein the screen mounting frame has a pair of support frame rods arranged opposite to the first locking bodies respectively attached to the left and right vertical sides or the upper and lower horizontal sides of the screen material, wherein the support frame rod has an inner wall arranged opposite to the first locking body, an opening formed in the inner wall, and a concave groove communicating with the opening, wherein the first locking body in the insect screen is accommodated in the concave groove through the opening of the support frame rod, characterized in that it is a screen door device.

7. The pair of support frame rods are detachably attached to the building opening, The screen door device according to claim 6, characterized in that...

8. The screen mounting frame has a pair of side frame bars extending between one longitudinal end and the other longitudinal end of each of the pair of support frame bars. A second locking body is attached to each of the left and right vertical sides or the upper and lower horizontal sides of the screen material where the first locking body is not attached. The second locking body is detachably attached to the side frame bar. The screen door device according to claim 7, characterized in that...

9. A method for attaching and detaching the insect screen of the screen door device according to claim 8 to and from the screen mounting frame, When removing the insect screen attached to the screen mounting frame, after removing the second locking body from the side frame bar, remove the pair of support frame bars from the building opening, and slide the insect screen relative to the pair of support frame bars to remove it from one longitudinal end of the pair of support frame bars. When attaching the insect screen to the screen mounting frame, slide and attach the insect screen to the pair of support frame bars, then attach the pair of support frame bars to the building opening, and attach the second locking body to the side frame bar. The method for attaching and detaching the insect screen, characterized in that...

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