JP6255723B2 - Blind device blade and blind device having the same - Google Patents

Description

  The present invention relates to a blade used in a blind device that is arranged on a window of a building to hide and shield a room, that is, a blade for a blind device and a blind device including the blade.

  A blind device is known in which a plurality of blades (slats or louvers) are arranged in a vertical direction on a window of a building so that the room is blinded by raising and lowering and tilting the blades, and natural light or artificial light is blocked. Has proposed a blind device provided with a lifting device for raising and lowering the blades and a tilting means (tilting mechanism) for tilting the blades.

JP 2004-156289 A JP 2004-300858 A JP 2011-162941 A

  By the way, in such a blind device, the blades that hide the indoors and shield natural light or artificial light are manufactured with the color of the material itself such as aluminum, or are colored or painted with a color that matches the installation room. However, if you want to change the color of these blades, or if you want to display paintings, advertisements, etc. individually or as a whole, you can replace the blades or print or baked paint on the blades themselves. As a result, it is difficult to respond flexibly, and it is difficult to avoid an increase in costs.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to easily change the color, or to easily display paintings, advertisements, etc. individually or as a whole. An object of the present invention is to provide a blade for a blind device capable of coping with an occasional change and a blind device including the blade.

  The blade for a blind device according to the present invention has a long blade body, a wall thickness smaller than the thickness of the blade body, and is removably fitted at both longitudinal edges of the blade body at the longitudinal edges. And a long thin plate that is elastic and flexible. The thin plate is overlapped with the blade body on at least one of the front surface and the back surface of the blade body.

  According to the blade for a blind device of the present invention, an elastic flexible long thin plate is removably fitted at each longitudinal edge of each longitudinal edge of the elongated blade body. Therefore, when the blade body itself does not have a design-harmonized color in the chamber to be installed, and the thin plate is superimposed on the blade body on the back surface of the blade body, the thin plate that is fitted Therefore, it is possible to make the color in harmony with the design of the room where it is installed, and by using a thin-walled board on which paintings, advertisements, etc. are displayed, the paintings, advertisements, etc. can be easily applied to the interior or exterior of the room. It is possible to provide a blade for a blind device that can be displayed and can cope with various demands in a flexible manner.

  In the present invention, the blade body may be made of any metal, synthetic resin, or wood having shape-retaining properties, but is preferably an extruded product of aluminum or resin or aluminum, polycarbonate, chloride, etc. It consists of a molded molded product made of a resin such as vinyl, or a thin plate of steel, more preferably an extruded product of aluminum having a thickness of about 1.0 mm. The thin plate is made of elastic flexibility and moderate shape retention. It may be any of a molded product or a resin plate made of metal, synthetic resin or wood metal, etc., but from the viewpoint of coloring, printing simplification, and weight reduction, Although it is made of synthetic resin of about 0.2 mm to 0.3 mm, durability, particularly when a thin plate is superimposed on the blade body on the surface of the blade body, weather resistance and From the ultraviolet point of view, it may be made of metal or a weatherproof and ultraviolet resistant synthetic resin, and the thin plate preferably has a longitudinal length that covers the entire longitudinal direction of the blade body. However, instead of this, it may be superposed on the blade body with a longitudinal length that partially covers the blade body in the longitudinal direction.

  In a preferred example of the present invention, the blade body is smaller than the radius of curvature of the long large-diameter arc portion having a large-diameter arc convex surface and the large-diameter arc convex surface of the large-diameter arc portion. It has a small-diameter arc convex surface with a radius of curvature and is integrally formed on both long edges of the large-diameter arc portion so that the small-diameter arc convex surface continuously extends from the large-diameter arc convex surface. The thin-walled plate is at least one of a long large-diameter thin-arc portion superimposed on the large-diameter arc portion of the blade body and a small-diameter arc portion of the blade body. And is detachably fitted to each of the small-diameter arc portions so as to be overlapped with the small-diameter arc portion and integrally formed on both longitudinal edges of the large-diameter thin-arc portion. Small-diameter arc thin-walled portions, and large-diameter arc thin-walled portions Similar to the large-diameter arc convex surface of the arc part, and has a large-diameter arc concave back surface in contact with the large-diameter arc convex surface, and the small-diameter arc thin wall part is a small diameter of the small-diameter arc part And has a small-arc-shaped concave back surface that continuously contacts the small-diameter circular convex surface and extends continuously from the large-diameter circular-arc concave surface.

  According to the blade for a blind device of this example, since the large-diameter arc thin portion is superimposed on the large-diameter arc portion so as to cover the large-diameter arc convex surface, for example, paintings and advertisements that can be viewed from the outside Etc. can be easily displayed, and the picture, advertisement, etc. can be appropriately changed according to the timing by detaching the thin plate from the blade body and replacing it by fitting.

  In this example, the small-diameter arc thin-walled portion of the thin plate only needs to wrap all or part of the small-diameter arc portion of the blade body so as to be detachably fitted to each of the small-diameter arc portions, Further, the blade body may further include an inner large-diameter arc portion facing the large-diameter arc portion so as to form an arc-shaped cavity in cooperation with the large-diameter arc portion. In this case, the large-diameter arc portion is integrally formed at one end of one small-diameter arc portion at one longitudinal edge and at one end of the other small-diameter arc portion at the other long-edge portion. The inner large-diameter arc part is formed integrally with the other end of one small-diameter arc part at one long edge and at the other end of the other small-diameter arc part at the other long edge. According to the blade for a blind device of such an example, the blade body has a large-diameter arc portion and an inner large-diameter arc. As a result, the weight of the blade body can be increased and the strength of the blade body can be increased. The shape of the blade body can be held firmly without bending. In addition, the blade body of this example is formed integrally with the large-diameter arc portion and the inner large-diameter arc portion so as to bridge the large-diameter arc portion and the inner large-diameter arc portion. The reinforcing rib can further increase the strength of the blade body, and can hold the shape of the blade body more firmly without being bent by wind or the like.

  In another preferable example of the blade for a blind device according to the present invention, the blade body has a long outer circular arc portion having an arc convex surface and a surface continuously extending from the arc convex surface of the outer arc portion. A latching edge formed integrally with each of the two longitudinal edges of the outer arc part with a slit and an arc concave surface, with one engaging edge part at one end and the other engaging part at the other end. Each of which is formed integrally with the stop edge portion and has an inner arc portion opposed to the outer arc portion so as to form an arc-shaped cavity in cooperation with the outer arc portion. The plate is formed integrally with the pair of longitudinal edges fitted in the respective slits of the locking edges and the pair of longitudinal edges, and has a similar shape to the arc concave surface of the inner arc portion. And an arc thin wall portion having an arc convex back surface that contacts the arc concave surface. .

  According to the blade for a blind device of such another example, since the arc thin wall portion is overlapped on the inner arc portion so as to cover the arc concave surface of the inner arc portion, for example, it has an appropriate color. The thin plate allows the blind device blades to correspond to the interior design such as the color of the room wall. In addition, by replacing the thin plate with the blade body, the color of the blind device blades according to the design of the room In addition, since the outer arc portion and the inner arc portion are provided, the strength of the blade body can be increased in the same manner as described above, and the outer arc portion and the inner arc can be reduced for weight reduction. Even if each part is thin, the shape of the blade body can be firmly held without being bent by wind or the like.

  In still another preferred example of the blade for a blind device according to the present invention, the blade body is integrally formed with a long arc portion having an arc convex surface and an arc concave back surface, and both longitudinal edges of the arc portion. In this case, the thin plate has a pair of longitudinal edges inserted into the semicylindrical part from the opening of each semicylindrical part, and a pair of longitudinal edges. And an arc thin portion having an arc convex back surface that is similar to the arc concave back surface of the arc portion and contacts the arc concave back surface.

  According to the blade for a blind device of such an example, since the thin arc portion is overlapped with the arc portion so as to cover the arc concave back surface of the arc portion, similarly to the above, for example, a thin wall having an appropriate color Blind device blades can be made to correspond to the indoor design such as the color of the room wall with the board, and the color of the blind device blades can be changed according to the design of the room by replacing the thin plate with the blade body. It can be changed and the weight can be reduced.

  According to the present invention, there is provided a blind device blade that can easily change colors, or can easily display paintings, advertisements, etc. individually or as a whole, and can deal flexibly with demand. A blind device may be provided.

FIG. 1 is a perspective explanatory view of a preferred example of an embodiment of the present invention. FIG. 2 is an explanatory side view of the example shown in FIG. FIG. 3 is an exploded side view of the example shown in FIG. FIG. 4 is a perspective explanatory view of an example of a blind device using the example shown in FIG. FIG. 5 is an operation explanatory diagram of the example shown in FIG. FIG. 6 is a perspective explanatory view of another preferred example of the embodiment of the present invention. FIG. 7 is an explanatory side view of the example shown in FIG. FIG. 8 is an exploded side view of the example shown in FIG. FIG. 9 is a perspective explanatory view of still another preferred example of the embodiment of the present invention. FIG. 10 is an explanatory side view of the example shown in FIG. FIG. 11 is an exploded side view of the example shown in FIG. FIG. 12 is a side explanatory view of still another preferred example of the embodiment of the present invention.

  Next, embodiments of the present invention will be described in more detail based on preferred examples shown in the drawings. The present invention is not limited to these examples.

  1 to 3, a blade 1 for a blind device according to the present example includes a long blade body 2 made of an extruded product of aluminum, and a thickness 0.2 mm thinner than a thickness t of about 1.0 mm of the blade body 2. And a long thin plate of elastic flexibility that is removably fitted to the longitudinal edges 3 and 4 of the blade body 2 at the longitudinal edges 5 and 6 respectively. 7.

  The blade body 2 has a large-diameter arcuate surface 11 having a large-diameter arc-shaped convex surface 11 and a large outer-circular arc portion 12 having a thickness of about 1.0 mm and a radius of curvature smaller than the radius of curvature of the arc-convex surface 11 of the arc-shaped portion 12. Both long edges 15 and 16 of the arc portion 12 so that the arc convex surfaces 13 and 14 have small diameter arc convex surfaces 13 and 14, and the arc convex surfaces 13 and 14 extend from the arc convex surface 11 so as to be flush with each other. Arcs 17 and 18 having a small diameter, which are formed integrally with each of the blades 2 to be both long edges 3 and 4 of the blade body 2, and an arcuate cavity 19 in cooperation with the arc 12. An arc portion 20 having a thickness of about 1.0 mm facing the portion 12, and a reinforcing rib 21 formed integrally with the arc portions 12 and 20 so as to divide the cavity 19 by bridging the arc portions 12 and 20; It has.

  The arc portion 12 is formed integrally with one end 25 of one arc portion 17 at one longitudinal edge 15 and at one end 26 of the other arc portion 18 at the other longitudinal edge 16. The portion 20 is formed integrally with the other end 28 of one arc portion 17 at one longitudinal edge portion 27 and the other end 30 of the other arc portion 18 at the other longitudinal edge portion 29.

  At least one of the front and back surfaces of the blade body 2, in this example, the arc convex surface 11 and the arc convex surfaces 13 and 14 which are the surfaces of the blade body 2, the arc portion 12 and the arc portions 17 and 18 of the blade body 2 The laminated thin plate 7 made of synthetic resin is composed of a long large-diameter arc thin-walled portion 35 superimposed on the arc-shaped portion 12 of the blade body 2 and a part of the arc-shaped portions 17 and 18 of the blade body 2. Each of the longitudinal edge portions 36 and 37 of the arc thin wall portion 35 is detachably fitted to each of the arc portions 17 and 18 so as to be wrapped around the respective arc portions 17 and 18 so as to overlap each other. And small-diameter arc thin-wall portions 38 and 39 formed integrally with each other.

  The arc thin wall portion 35 is similar to the arc convex surface 44 having a large diameter similar to the arc convex surface 11 of the arc portion 12 and is similar to the arc convex surface 11 of the arc portion 12 and is in contact with the arc convex surface 11. Each of the arc thin wall portions 38 and 39 is similar to the respective arc convex surfaces 13 and 14 of the arc portions 17 and 18, and the arc convex surface 13 and 14, and has small-diameter arc concave back surfaces 46 and 47 that continuously extend from the arc concave back surface 45 in a flush manner.

  As shown in FIGS. 4 and 5, the blind device 50 is surrounded by a frame body 55 including an upper frame 51, a lower frame 52, and vertical frames 53 and 54, an upper frame 51, a lower frame 52, and vertical frames 53 and 54. A plurality of the above-described blind blades 1 for the blind device which are arranged in the space 56 and which can be tilted and raised with respect to the vertical frames 53 and 54, and the vertical frames 53 and 54 in the space 56. The vertical movement and tilting mechanism (not shown) and the longitudinal direction of each of the blind device blades 1 are moved by manual operation of the ball chain 57 hanging from the upper frame 51 while moving the blade device blades 1 up and down and tilting. And a connecting mechanism (not shown) for connecting the one end portion 58 and the other end portion 59 to the lifting / tilting mechanism. The lifting / tilting mechanism of the blind device 50 is driven by manual operation of the ball chain 57. The blind device blade 1 is guided by the slit 60 provided in the vertical frames 53 and 54 with respect to the vertical frames 53 and 54 through the connecting mechanism, and the space 56 is completely formed by the blind device blades 1. The blind device blade 1 is closed (see FIG. 4) or completely opened, and the blind device blade 1 is tilted with respect to the vertical frames 53 and 54 (see FIG. 5). Since the tilting mechanism and the coupling mechanism are known, detailed description thereof will be omitted.

  In the blade 1 for the blind device, the thin plate 7 may be inserted into the blade body 2 along the longitudinal direction A from the side, and the thin plate 7 may be fitted to the blade body 2, but as shown in FIG. 7, the arc thin portion 35 is pressed toward the arc convex surface 11 of the blade body 2 as indicated by the direction B, and the vicinity of the arc thin portions 38 and 39 along the direction C is pressed. The thin-walled plate 7 may be fitted to the blade main body 2 by bending the thin-arc portions 38 and 39 into the arc-shaped portions 17 and 18 in a snap-fit manner. When the thin plate 7 is mounted or the thin plate 7 is replaced with the blade main body 2, the blind device from the connecting mechanism that connects the longitudinal end portion 58 and the other end portion 59 of the blade 1 for the blind device to the lifting and tilting mechanism. Removal of the blade 1 can be omitted While attaching the blind apparatus vane 1 in the coupling mechanism, it is possible to replace the thin plate 7 for mounting or blade body 2 of the thin plate 7 into the blade body 2.

  According to the blade 1 for a blind device described above, an elastic flexible long thin plate 7 is provided on each of the arc portions 17 and 18 which are both longitudinal edges 3 and 4 of the long blade body 2. Since the arc thin surface 35 is superimposed on the arc portion 12 so as to be detachably fitted at the longitudinal edges 5 and 6 and covering the arc convex surface 11, a painting is formed on the arc convex surface 44 of the arc thin portion 35. By using the thin-walled plate 7 on which advertisements and the like are displayed, it is possible to easily display a picture or advertisement that can be seen from the outside partially or entirely, and to deal with various demands flexibly. In addition, such a picture, advertisement, etc. can be appropriately changed according to the timing by detaching the thin plate 7 from the blade body 2 and replacing it by fitting.

  Moreover, according to the blade | wing 1 for blind apparatuses, as a result of having provided the circular arc part 12 and the circular arc part 20 which the blade main body 2 forms the cavity 19, in other words, as a result of the blade main body 2 being a hollow body, weight reduction is achieved. In addition, the strength of the blade body 2 can be increased, the shape of the blade body 2 can be firmly held without being bent by the wind even if each of the arc portions 12 and 20 is thin for weight reduction, Further, since the reinforcing rib 21 is further provided, the strength of the blade body 2 can be further increased, and the shape of the blade body 2 can be held more firmly without being bent by wind or the like.

  In the blind device blade 1 described above, the thin plate 7 is superimposed on the blade body 2 on the surface of the blade body 2, but instead, as shown in FIGS. The blade main body 66 may be overlaid on the back surface of the main body 66.

  That is, the blind device blade 1 shown in FIGS. 6 to 8 used for the blind device 50 is composed of a long blade body 66 made of an extruded product of aluminum and a thickness t of the blade body 66 of about 1.0 mm. Further, it has a thin thickness of about 0.2 mm to 0.3 mm, and is elastically flexible and removably fitted to the longitudinal edges 67 and 68 of the blade body 66 at the longitudinal edges 69 and 70, respectively. The blade body 66 includes a long outer arc portion 76 having an arc convex surface 75, a surface 77 extending continuously from the arc convex surface 75 of the arc portion 76, and a long thin plate 65. 78, each having slits 79 and 80, and formed integrally with both longitudinal edges 81 and 82 of the arc portion 76 to form both longitudinal edges 67 and 68 of the blade body 66. Stop portions 83 and 84; A circular arc concave surface 90 is formed integrally with one locking edge 83 at one end 91 and the other locking edge 84 at the other end 92, and in cooperation with the outer circular arc 76. An inner circular arc portion 94 facing the outer circular arc portion 76 so as to form an arcuate cavity 93 is provided, and the thin plate 65 is inserted into the slits 79 and 80 of the locking edge portions 83 and 84, respectively. A pair of longitudinal edges 69 and 70 fitted together and a pair of longitudinal edges 69 and 70 formed integrally with the arcuate concave surface 90 of the inner arcuate part 94, And an arc thin wall portion 96 having an arc convex back surface 95 in contact with the arc concave surface 90.

  As described above, in the blind device blade 1 shown in FIGS. 6 to 8, the thin plate 65 is superimposed on the blade body 66 on the arc concave surface 90 which is the back surface of the blade body 66 on the arc convex back surface 95. In the blade 1 for a blind device, the longitudinal edges 69 and 70 of the thin plate 65 are inserted into the slits 79 and 80 of the blade body 66 along the longitudinal direction A from the side, and the thin plate 65 is fitted to the blade body 66. However, as shown in FIG. 8, by utilizing the elastic flexibility of the thin plate 65, the arc thin wall portion 96 is pressed toward the arc concave surface 90 of the blade body 66 as shown in the direction B, and the The vicinity of the edges 69 and 70 may be bent along the direction C, the long edges 69 and 70 may be inserted into the slits 79 and 80, and the thin plate 65 may be fitted to the blade body 66. Then, feather body When the thin plate 65 is attached to the blade 6 or the thin plate 65 is replaced with the blade main body 66, the longitudinal end portion 58 and the other end portion 59 of the blind device blade 1 are moved up and down and connected to a tilting mechanism. The blind device blade 1 can be removed, and the thin plate 65 can be attached to the blade body 66 or the thin plate 65 can be replaced with the blade body 66 with the blind device blade 1 attached to the connecting mechanism. it can.

  According to the blind device blade 1 shown in FIGS. 6 to 8, an elastic flexible long thin plate 65 is provided at each of the longitudinal edges 67 and 68 of the long blade body 66. The portions 69 and 70 are detachably fitted through the slits 79 and 80, and the arc thin surface portion 96 is overlapped with the arc portion 94 so as to cover the arc concave surface 90. Even if the color itself does not have a design-harmonic color, the color can be a design-harmonic color in the room installed with the thin plate 65 fitted, and a painting or the like can be formed on the arc concave surface 97 of the arc thin wall portion 96. By using the displayed thin plate 65, a picture or the like can be easily displayed partially or entirely, and can respond to various demands in the room flexibly. The thin plate 65 is attached and removed by fitting and fitting. In, it can be appropriately changed in accordance with such a color, painting, etc. in time.

  Moreover, according to the blade | wing 1 for blind apparatuses shown in FIGS. 6-8, as a result of the blade main body 66 comprising the circular arc part 76 and the circular arc part 94 which form the cavity 93, in other words, the blade main body 66 is a hollow body. As a result, the weight of the blade body 66 can be increased and the strength of the blade body 66 can be increased. Even if the arc portions 76 and 94 are thinned for weight reduction, the blade body 66 can be firmly fixed without being bent by the wind or the like. The shape can be maintained. In this example as well, reinforcing ribs similar to the reinforcing rib 21 are provided to further increase the strength of the blade body 66 so that the shape of the blade body 66 can be held more firmly without being bent by wind or the like. Also good.

  In the blind device blade 1 described above, each of the blade bodies 2 and 66 is a hollow body, but instead of this, as shown in FIGS. 9 to 11, a blade body 101 that is not a hollow body may be used.

  That is, the blind device blade 1 shown in FIG. 9 to FIG. 11 used for the blind device 50 has a long blade body 101 made of an extruded product of aluminum and a thickness t of about 1.0 mm of the blade body 101. It has a thin thickness of about 0.2 mm to 0.3 mm, and is elastically flexible and removably fitted to the longitudinal edges 102 and 103 of the blade body 101 at the longitudinal edges 104 and 105, respectively. The blade body 101 includes a long arc portion 112 having an arc convex surface 110 and an arc concave back surface 111, and both longitudinal edges 113 and 114 of the arc portion 112, respectively. And the semi-cylindrical portions 115 and 116 that form both longitudinal edges 102 and 103 of the blade body 101, and the thin plate 106 is formed of the semi-cylindrical portions 115 and 116. A pair of longitudinal edge portions 104 and 105 inserted into the semi-cylindrical portions 115 and 116 from the openings 117 and 118, and a pair of longitudinal edge portions 104 and 105 are formed integrally with the arc portion 112. An arc thin wall portion 120 having a similar shape to the arc concave back surface 111 and having an arc convex back surface 119 in contact with the arc concave back surface 111 is provided.

  As described above, in the blind device blade 1 shown in FIGS. 9 to 11, the thin plate 106 is superimposed on the blade body 101 on the arc concave back surface 111 which is the back surface of the blade body 101 on the arc convex back surface 119. The blade 1 for the blind device is configured such that the longitudinal edges 104 and 105 of the thin plate 106 are inserted into the openings 117 and 118 of the blade body 101 along the longitudinal direction A from the side, and the thin plate 106 is fitted to the blade body 101. However, as shown in FIG. 11, by utilizing the elastic flexibility of the thin plate 106, the arc thin wall portion 120 is pressed toward the arc concave back surface 111 of the blade body 101 as indicated by the direction B, and the The vicinity of the edges 104 and 105 is bent along the direction C, and the longitudinal edges 104 and 105 are inserted into the semi-cylindrical parts 115 and 116 from the openings 117 and 118. The thin plate 106 may be fitted to the blade body 101, and in this way, when the thin plate 106 is attached to the blade body 101 or the thin plate 106 is replaced with the blade body 101, each of the blind device blades 1 is provided. Removal of the blade 1 for the blind device from the connecting mechanism for connecting the longitudinal one end portion 58 and the other end portion 59 to the lifting and tilting mechanism can be omitted. The thin plate 106 can be attached to the 101 or the thin plate 106 can be replaced with the blade body 101.

  Also in the blind device blade 1 shown in FIG. 9 to FIG. 11, an elastic flexible long thin plate 106 is provided on each of the longitudinal edges 102 and 103 of the elongated blade body 101. 104 and 105 are detachably fitted through the openings 117 and 118, and the arc thin portion 120 is superimposed on the arc portion 112 so as to cover the arc concave back surface 111. Even if it does not have a design-harmonic color, it can be a design-harmonic color in the room installed with the thin plate 106 fitted, and a picture or the like is displayed on the arc concave surface 121 of the arc thin wall portion 120 By using the thin-walled plate 106, a picture or the like can be easily displayed partially or entirely, and can respond to various demands in the room flexibly. Desorption of the thin plate 106, in exchange with the fitting, can be appropriately changed according such colors, the painting or the like at a time.

  Incidentally, the blade body 2 of the blind device blade 1 shown in FIGS. 1 to 3 includes an arc portion 20 and a reinforcing rib 21 in addition to the arc portion 12 and the arc portions 17 and 18. Instead, as shown in FIG. 12, the blade body 2 may be configured by the arc portion 12 and the arc portions 17 and 18 shown in FIGS. 1 to 3. In this case, too, the blade body 2 has a thin wall. A blind device blade can be obtained by fitting the plate 7 in the same manner as described above.

1 Blind device blade 2 Blade body 3, 4, 5, 6, 15, 16, 27, 29, 36, 37 Long edge 7 Thin plate 11, 13, 14 Arc convex surface 12, 17, 18, 20 Arc 19 Cavity 21 Reinforcement rib 25, 26 One end 28, 30 The other end 35, 38, 39 Arc thin wall portion 44 Arc convex surface 45, 46, 47 Arc concave back surface

Claims (7)

A long and flexible blade, and a thin elastic body that has a thickness smaller than the thickness of the blade body and is detachably fitted to each of the longitudinal edges of the blade body at the longitudinal edges. The thin plate is superimposed on the blade body on at least one of the front surface and the back surface of the blade body, and the blade body has a long diameter arc convex surface. A large-diameter arc portion, and a small-diameter arc convex surface having a smaller radius of curvature than the radius of curvature of the large-diameter arc-convex surface of the large-diameter arc portion, and the small-diameter arc-convex surface is a large-diameter arc A small-diameter arc part integrally formed on each of both longitudinal edges of the large-diameter arc part so as to continuously extend from the convex surface, and the thin plate is a large-diameter arc of the blade body Long large-diameter arc thin-walled portion superimposed on the part and small-diameter arc of the blade body And is detachably fitted to each of the small-diameter arc portions so as to be overlapped with the small-diameter arc portion and integrated with each of the two longitudinal edges of the large-diameter thin-wall portion. The large-diameter arc thin wall portion is similar to the large-diameter arc convex surface of the large-diameter arc portion, and the large-diameter arc convex surface. The small-diameter arc thin wall portion is similar to the small-diameter arc convex surface of the small-diameter arc portion and is in contact with the small-diameter arc-convex surface and has a large diameter. The blade | wing for blind apparatuses which has a small-diameter circular arc concave back surface continuously extended from the circular arc concave back surface .   2. The blade for a blind device according to claim 1, wherein the blade body is formed by extrusion molding of aluminum or resin, or forming molding of a thin plate of aluminum, resin, or steel. The blade body further includes an inner large-diameter arc portion opposed to the large-diameter arc portion so as to form an arc-shaped cavity in cooperation with the large-diameter arc portion, and the large-diameter arc portion Is formed integrally with one end of one small-diameter arc portion at one longitudinal edge and at one end of the other small-diameter arc portion at the other longitudinal edge portion, and has an inner large-diameter arc. The part is formed integrally with the other end of one small-diameter arc part at one longitudinal edge thereof and the other end of the other small-diameter arc part at the other longitudinal edge part, respectively. The blade | wing for blind apparatuses of 2. A long and flexible blade, and a thin elastic body that has a thickness smaller than the thickness of the blade body and is detachably fitted to each of the longitudinal edges of the blade body at the longitudinal edges. The thin plate is superimposed on the blade body on at least one of the front surface and the back surface of the blade body, and the blade body has a long outer surface having an arc convex surface. An arcuate part, and a locking edge having a surface continuously extending from the arcuate convex surface of the outer arcuate part and having a slit and integrally formed on each of the two longitudinal edges of the outer arcuate part; , With an arc concave surface, formed integrally with one locking edge at one end and the other locking edge at the other and forming an arc-shaped cavity in cooperation with the outer arc And an inner arc portion facing the outer arc portion The thin plate has a pair of longitudinal edges fitted in the respective slits of the locking edge, and is formed integrally with the pair of longitudinal edges and has a similar shape to the arc concave surface of the inner arc portion. A blade for a blind device comprising: an arc thin wall portion having an arc convex back surface that contacts the arc concave surface. A long and flexible blade, and a thin elastic body that has a thickness smaller than the thickness of the blade body and is detachably fitted to each of the longitudinal edges of the blade body at the longitudinal edges. The thin plate is superimposed on the blade body on at least one of the front surface and the back surface of the blade body, and the blade body has an arc convex surface and an arc concave back surface. And a semi-cylindrical portion formed integrally with each of the longitudinal edges of the arc portion, and the thin plate is inserted into the semi-cylindrical portion through the opening of each semi-cylindrical portion. A pair of long edge portions formed integrally with the pair of long edge portions and an arc convex back surface that is similar to the arc concave back surface of the arc portion and contacts the arc concave back surface. A blade for a blind device having an arc thin portion. The blade body for a blind device according to claim 4 or 5, wherein the blade body is formed by extrusion molding of aluminum or resin or forming molding of a thin plate of aluminum, resin or steel. The blind apparatus provided with the blade | wing for blind apparatuses as described in any one of Claim 1 to 6.

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