BLIND

Abstract

To provide a blind that can further improve the shielding performance in a shielded state. [Solution] The blind comprises a plurality of slats arranged in the vertical direction, a first shielding material, a second shielding material, a bottom rail, and an opening / closing mechanism. The first shielding material is provided on the front side of the plurality of slats and is light-transmitting. The second shielding material is provided on the rear side of the plurality of slats, opposite the first shielding material, and is light-transmitting. The bottom rail has a connecting portion to which the lower ends of the first and second shielding materials are connected, and to which the lower end of the first shielding material, which is turned at the front end of the bottom rail, can be connected from the lower surface side of the bottom rail. The opening / closing mechanism is provided so as to be able to wind up and unwind the first and second shielding materials so as to be able to open and close the plurality of slats, and moves the first and second shielding materials relative to each other so that the front ends face downward when the plurality of slats are in a shielding state where they are substantially vertical.

Description

Technical Field

[0001] The present invention relates to a blind.

Background Art

[0002] As a conventional blind, the one shown in Patent Document 1 below is known. The blind shown in this document includes a first light-transmissive sheet, a second light-transmissive sheet, a plurality of slats provided between the first and second light-transmissive sheets, an opening / closing mechanism in which one ends of the first and second light-transmissive sheets are connected so as to be wound up and unwound, and a bottom rail to which the other ends of the first and second light-transmissive sheets are connected. By moving the first and second light-transmissive sheets closer or farther apart by the opening / closing mechanism to rotate the slats, the shielding state and the daylighting state are switched.

[0003] Also, as this type of blind, there is known a blind in which the bottom rail is configured such that the center of gravity is located on the front side (indoor side) rather than the center position in the front-rear direction, and the bottom rail stands more vertically in the shielding state.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] According to such a blind, since it is possible to bring the first and second shielding materials closer to each other in the shielding state, an improvement effect in shielding property can be expected. However, depending on the specifications of the blind, sufficient effects may not always be obtained, and further improvement in shielding property has still been desired.

[0006] In view of the above circumstances, an object of the present invention is to provide a blind capable of further improving the shielding property in the shielding state. [Means for solving the problem]

[0007] To achieve the above objective, a blind according to one embodiment of the present invention comprises a plurality of slats arranged in the vertical direction, a first shielding material, a second shielding material, a bottom rail, and an opening and closing mechanism. The first shielding material is provided on the front side of the plurality of slats and is light-transmitting. The second shielding material is provided on the rear side of the plurality of slats, opposite the first shielding material, and is light-transmitting. The bottom rail has a connecting portion to which the lower ends of the first and second shielding materials are connected, and to which the lower end of the first shielding material, which is turned at the front end of the bottom rail, can be connected from the lower surface side of the bottom rail. The opening and closing mechanism is provided so as to be able to wind up and unwind the first and second shielding materials so as to be able to open and close the plurality of slats, and moves the first and second shielding materials relative to each other so that the front ends face downward when the plurality of slats are in a shielding state where they are substantially vertical.

[0008] In this configuration, when the shielding state is achieved, the bottom rail stands upright while wrapping around the first shielding material at its front end, thus applying downward tension to the first shielding material. As a result, the slats become more vertical, improving the shielding performance in the shielded state.

[0009] The bottom rail may have a continuously expanding portion formed from the front end towards the rear.

[0010] With this configuration, the amount of the first shielding material that is wrapped around the bottom rail when it stands up can be increased by the enlarged section, thereby further enhancing the shielding effect.

[0011] The enlarged portion may be formed in a curved shape from its front surface to its upper surface.

[0012] This configuration reduces the indentation and wear on the first shielding material caused by it being wrapped around and in contact with the curved shape of the front end of the bottom rail.

[0013] The connecting portion may be formed in the internal space of the enlarged portion.

[0014] This configuration allows for ample space to form the connecting section, making it easy to create a connecting section that can connect the lower end of the first shielding material from the underside of the bottom rail.

[0015] The opening and closing mechanism may have a winding pipe to which the upper ends of the first and second shielding materials are connected. In this case, the bottom rail may have a curved portion between the enlarged portion and its rear end that conforms to the circumferential surface of the first and second shielding materials wound around the winding pipe.

[0016] This configuration allows for a design of the bottom rail that reduces the storage dimensions when the first and second shielding materials are rolled up, while also improving the shielding performance in the shielded state. [Effects of the Invention]

[0017] As described above, the present invention provides a blind that can further improve shielding performance in a shielded state. However, this effect is not limited to the present invention. [Brief explanation of the drawing]

[0018] [Figure 1] This is a side view of a blind according to the first embodiment of the present invention. [Figure 2] This is a side cross-sectional view of the blind near the headbox. [Figure 3] This is a side cross-section of the blind shown above when the screen is in its lowest position. [Figure 4] This is a side cross-sectional view showing the rotation state of the bottom rail of the blinds mentioned above. [Figure 5] This is a side cross-sectional view showing the connection between the bottom rail of the blind and each screen. [Figure 6] This is a side cross-sectional view showing the connection between the bottom rail and each screen of a blind according to a second embodiment of the present invention. [Figure 7] It is a side sectional view showing the connection state between the bottom rail of the blind and each screen according to the third embodiment of the present invention.

Mode for Carrying Out the Invention

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] <First Embodiment> First, the blind according to the first embodiment of the present invention will be described.

[0021] [Configuration of Blind] FIG. 1 is a side view of the blind according to the present embodiment. FIG. 2 is a side sectional view near the head box of the blind. FIG. 3 is a side sectional view when the screen of the blind is at the lowest position. In FIG. 2, (A) of the figure shows the state where the screen is wound up to the upper limit position, and (B) of the figure shows the state where the screen has started to descend. In FIG. 3, (A) of the figure shows the state where the slats are substantially vertical, and (B) of the figure shows the state where the slats are substantially horizontal.

[0022] As shown in these figures, the blind 100 is a dimming screen having a screen 10, a head box 4, and a bottom rail 5. The screen 10 is composed of a first screen (first shielding material) 1, a second screen (second shielding material) 2, and slats 3.

[0023] The first screen 1 and the second screen 2 are translucent or transparent sheets (front race fabric, back race fabric) such as a race having translucency, and their upper ends are supported by the head box 4 at a predetermined interval in the Z direction.

[0024] Between the first screen 1 and the second screen 2, multiple slats 3 are provided at intervals along the vertical direction (Y direction). In other words, the first screen 1 is provided on the front side of the slats 3, and the second screen 2 is provided on the rear side. The connection method between the first screen 1 and the second screen 2 and each slat 3 may be by adhesive or sewing. Here, "front" refers to the indoor side, which is the left side in each figure, and "rear" refers to the outdoor side, which is the right side in each figure.

[0025] Each slat 3 is an opaque sheet made of any material, such as woven fabric, knitted fabric, nonwoven fabric, paper sheet, synthetic resin sheet, or wood sheet, made of synthetic resin fibers or natural fibers. Each slat 3 may be flexible.

[0026] As shown in Figures 1 and 3(B), when the first screen 1 and the second screen 2 are spaced apart by the predetermined distance and each slat 3 is in a horizontal position (approximately perpendicular to the first screen 1 and the second screen 2 (on the XZ plane)), there is an open space between adjacent slats 3 in the vertical (Y direction). In this open state, external light such as sunlight passes through the second screen 2, is reflected by the slats 3, passes through the first screen 1, or the light that has passed through the second screen 2 passes directly through the first screen 1 and enters the room (daylighting state).

[0027] On the other hand, as shown in Figure 3(A), when the first screen 1 and the second screen 2 are close together and each slat 3 is in a nearly vertical position (nearly parallel to the first screen 1 and the second screen 2), the space between adjacent slats 3 vertically is completely closed. In this closed state, the light from the outside that passes through the second screen 2 is blocked by the slats 3 (shielding state).

[0028] As shown in Figure 3, the headbox 4 has a set frame 41. The blind 100 is installed by fixing the set frame 41 to a window frame, wall, etc., with screws or the like via a bracket 9 provided above it. As shown in Figure 1, a side cover 42 is provided on the side of the headbox 4.

[0029] Furthermore, as shown in Figures 1 to 3, the headbox 4 has an opening / closing mechanism 6 inside which the first screen 1 and the second screen 2 are provided to be able to be wound up and unwound so that the multiple slats 3 can be opened and closed.

[0030] The opening / closing mechanism 6 has a winding pipe 61 to which the upper ends of the first screen 1 and the second screen 2 are connected. The opening / closing mechanism 6 also has a pulley (not shown) included in an operating unit 62 (see Figure 1) provided at one end of the winding pipe 61, and an operating cord 63 (see Figure 1) wound around the pulley. By operating the operating cord 63, the pulley is rotationally driven, and this rotation is transmitted to the winding pipe 61.

[0031] Furthermore, when the first screen 1 and the second screen 2 are rolled down, the opening and closing mechanism 6 can switch between the light-transmitting state and the shading state of the slat 3 by moving the first screen 1 and the second screen 2 relative to each other.

[0032] As shown in Figures 1 to 3, bottom rails 5 are connected to the lower ends of the first screen 1 and the second screen 2. As shown in Figures 1 and 2, bottom caps 50 are connected to both sides of the bottom rail 5 so as to cover the openings on both sides.

[0033] As shown in Figure 3, the bottom rail 5 has a flat plate shape, and as shown in Figure (A), when the slat 3 is in a shielding state (almost vertical), its main surface is almost vertical (its front end faces downward), and as shown in Figure (B), when the slat 3 is in a light-transmitting state (almost horizontal), its main surface is almost horizontal.

[0034] In other words, when switching the slat 3 from a light-transmitting state to a shielded state, the opening and closing mechanism 6 moves the first screen 1 and the second screen 2 relative to each other so that the front end of the bottom rail 5 faces downward.

[0035] [Bottom rail details] The details of the bottom rail 5 are described below. Figure 4 is a side cross-sectional view showing the rotation state of the bottom rail 5, where (A) shows the slats 3 in a nearly vertical position (shading state), (B) shows the slats 3 tilted at 45°, and (C) shows the slats 3 in a nearly horizontal position (lighting state). Figure 5 is a side cross-sectional view showing the connection state between the bottom rail 5 and the first screen 1 and the A2 screen 2, where (A) shows the slats 3 in a nearly horizontal position (lighting state), and (B) shows the slats 3 in a nearly vertical position (shading state).

[0036] As shown in these figures, both the first screen 1 and the second screen 2 are rotated from the upper side to the lower side of the bottom rail 5 and connected from the lower side. In this embodiment, the "upper surface" and "lower surface" of the bottom rail 5 refer to the upper and lower surfaces of the slats 3 in the light-collecting state (Figure 5(A)). Similarly, the "front (front end)" and "rear (rear end)" of the bottom rail 5 refer to the front (front end) (left end in the same figure) and rear (rear end) (right end in the same figure) in the light-collecting state (Figure 5(A)).

[0037] Specifically, a first screen stopper plate 11 is attached to the lower end of the first screen 1. The first screen stopper plate 11 is, for example, a long, thin plate made of resin, and is provided along the entire length of the first screen 1 in the width direction (X direction). It is fixed to the lower end of the first screen 1 by, for example, multiple staples, thereby forming a front connecting portion 12 between the first screen 1 and the bottom rail 5.

[0038] A first plate housing section 5a, which opens to the bottom, is provided on the front side of the bottom rail 5 (left side in Figure 5(A)). The first screen stopper plate 11 (front connecting section 12), to which the lower end of the first screen 1 is fixed, is inserted into the first plate housing section 5a through its opening and engages with the corners and other parts inside the first plate housing section 5a. This connects the lower end of the first screen 1 to the bottom rail 5.

[0039] The bottom rail 5 has a larger volume (projecting upward) enlarged portion 52 on its front side (left side in Figure 5(A)), which is continuously formed from the front end of the bottom rail 5 to the rear side (right side), and is larger in volume than the other parts. The enlarged portion 52 is formed in a curved shape, for example, from its front surface to its top surface. The first plate housing portion 5a is formed as the internal space of the enlarged portion 52, and the front connecting portion 12 (and the first screen retaining plate 11) is provided in the first plate housing portion 5a as the internal space.

[0040] As a result, the first screen 1 is turned at the enlarged portion 52 at the front end of the bottom rail 5 and connected from the underside of the bottom rail 5. By providing the front connecting portion 12 in the internal space of the enlarged portion 52, a large space is secured for the front connecting portion 12, making it easy to connect the first screen to the bottom rail 5.

[0041] On the other hand, a second screen stopper plate 21 is attached to the lower end of the second screen 2. Like the first screen stopper plate 11, the second screen stopper plate 21 is, for example, a long, thin plate made of resin, and is provided along the entire length of the second screen 2 in the width direction (X direction). It is fixed to the lower end of the second screen 2 by, for example, multiple staples, thereby forming the rear connecting portion 22 between the second screen 2 and the bottom rail 5.

[0042] A second plate housing section 5b, which opens to the bottom surface, is provided at a position closer to the center in the front-to-back direction (Z direction) than the rear end in the width direction (Z direction) of the bottom rail 5 (right end in Figure 5(A)). The second screen stopper plate 21 (rear side connecting section 22), to which the lower end of the second screen 2 is fixed, is inserted into the second plate housing section 5b through its opening and engages with the corners and other parts inside the second plate housing section 5b. As a result, the lower end of the second screen 2 is rotated at the rear end of the bottom rail 5 and connected from the bottom surface side of the bottom rail 5.

[0043] Furthermore, a plate cover 23 is provided on the lower surface of the second screen retaining plate 21, for example by adhesive, to prevent the staples used to fix the second screen 2 and the second screen retaining plate 21 from being exposed through the opening of the second plate housing 5b, thus preventing a deterioration in the aesthetic appearance.

[0044] The rear edge of the opening of the second plate housing 5b functions as a contact portion 54 that remains in contact with the inner surface of the second screen 2 throughout the rotational range of the bottom rail 5, from the light-collecting state to the shielded state.

[0045] Furthermore, an inclined portion 59 extending diagonally upward is formed from the contact portion 54 to the rear end of the bottom rail 5. As a result, in the above-mentioned lighting conditions, the rear end of the bottom rail 5 is positioned above the contact portion 54.

[0046] Furthermore, a first weight housing section 55, which opens to the lower side, is formed between the first plate housing section 5a and the second plate housing section 5b on the lower side of the bottom rail 5 (forward of the second plate housing section 5b), and a first weight 56 ​​is housed in this first weight housing section 55.

[0047] The first weight 56 ​​can be fixed to the first weight housing 55, for example, by a screw S, and its position can be adjusted in the left-right direction (X direction) within the first weight housing 55. This allows the winding disorder of the first screen 1 and the second screen 2 to be resolved by adjusting the balance of the bottom rail 5 in the left-right direction. At the same time, the first weight 56 ​​sets the center of gravity of the bottom rail 5 forward of the rear connecting portion 22 of the second screen, thereby assisting the rotation of the bottom rail 5 when switching from a light-collecting state to a shielding state.

[0048] A bottom cover 51 is provided at the opening of the first weight housing section 55 to prevent the first weight 56 ​​from being exposed and thus detracting from the aesthetic appearance. The bottom cover 51 also covers the opening of the first plate housing section 5a, preventing the staples that secure the first screen 1 and the first screen retaining plate 11 from being exposed and thus detracting from the aesthetic appearance.

[0049] Furthermore, on the upper side of the bottom rail 5, between the enlarged portion 52 and the rear end, a curved portion 53 is formed with a concave curved shape (see Figure 2(A)) that follows the circumferential surface of the first screen 1 and the second screen 2 wound onto the winding pipe 61. In addition, this curved portion 53 is formed continuously from the enlarged portion 52, so that it has a shape that resembles the slat 3 (see Figure 4(C)).

[0050] A second weight housing section 57, which opens to the upper side, is formed on the rear side of the curved surface section 53, and a second weight 58 is housed in this second weight housing section 57. The second weight 58 is smaller in weight and thickness than the first weight 56.

[0051] The lowest slat 3a, located at the bottom of the multiple slats 3, is positioned on the bottom rail 5 with at least a portion of it fixed to the bottom rail 5. The front end 31 of the lowest slat 3a is connected to the first screen 1, but its rear end 32 is not connected to the second screen 2.

[0052] Specifically, the rear end 32 of the lowest slat 3a is fixed to the slat fixing portion 60 at the rear end of the second weight 58, for example, by adhesive. This allows the lowest slat 3a to be fixed on the bottom rail 5, and because the lowest slat 3a covers the second weight 58, it prevents the second weight 58 from being exposed through the opening of the second weight housing portion 57, thus preventing a deterioration in aesthetics. The front end of the lowest slat 3a may also be fixed to the front end of the enlarged portion 52 of the bottom rail 5 by adhesive or the like.

[0053] [Blind operation] Next, we will explain the operation of the blind 100 configured as described above.

[0054] (Slat opening and closing operation) First, let's explain the opening and closing operation of slat 3.

[0055] When the first screen 1 and the second screen 2 are rolled down to their lowest ends, the rotation of the opening / closing mechanism 6 (winding pipe 61) causes the first screen 1 and the second screen 2 to move relative to each other in the vertical direction (Y direction), changing the distance between the two screens, thereby switching between the light-transmitting state and the shading state of the slats 3.

[0056] In other words, from the lighting state shown in Figures 3(B), 4(C), and 5(A) (where the slats 3 are approximately horizontal), if, for example, the front side of the operation cord 63 is pulled down and the winding pipe 61 rotates counterclockwise in the direction shown in Figure 3, the first screen 1 moves away from the headbox 4 and the second screen 2 moves closer to the headbox 4, both in the Y direction. As shown in Figure 4(B), the position of the second screen 2 becomes higher than that of the first screen 1, and the slats 3 and bottom rail 5 tilt in the XY plane. When the winding pipe 61 rotates 180°, the space between the slats 3 becomes closed (the main surfaces of the slats 3 and bottom rail 5 are approximately vertical), as shown in Figures 3(A) and 4(A).

[0057] In this case, as shown in Figures 4(A) and 5(B), the bottom rail 5 stands upright as it wraps around the first screen 1 with its enlarged portion 52 (arrow A in Figure 5(B) indicates the wrapped area of ​​the first screen 1), and downward tension is applied to the first screen 1. As a result, the slats 3 become more vertical, improving the shielding performance in the shielded state. In addition, since the first screen 1 is wrapped around while in contact with the curved shape of the enlarged portion 52, it is possible to reduce the indentation and wear on the first screen 1.

[0058] Furthermore, since the second screen 2 is connected to the bottom rail 5 at a position closer to the center in the front-rear direction (rear connecting portion 22) to assist in the rotation of the bottom rail 5, the bottom rail 5 rotates while constantly receiving a pressing force in the rotational direction from the second screen 2 at its contact portion 54. This allows the bottom rail 5 to stand more vertically, improving the shielding performance in the shielded state.

[0059] Furthermore, the inclined portion 59 allows the rear end of the bottom rail 5 to rotate so that it separates from the second screen 2 (see arrow B in Figure 5(B)) and moves closer to the first screen 1, pressing against the first screen 1 and the slats 3 (see arrow in Figure 4(A)). This allows the bottom rail 5 to stand more vertically in the shielded state, while increasing the design freedom in terms of the center of gravity and the shape, taking into account the dimensions of the storage when the first screen 1 and the second screen 2 are rolled up. In other words, a heavy first weight 56 ​​is placed on the front side of the bottom rail 5 to position the center of gravity, while there is no need to place a large weight on the rear side of the bottom rail 5, so its thickness can be reduced, and the storage of the screen 10 in the headbox 4 when rolled up can be improved.

[0060] Furthermore, since the lowest slat 3a is not connected to the second screen 2, the lowest slat 3a does not obstruct the rotation of the bottom rail 5 when the screen is closed, allowing the bottom rail 5 to stand more vertically and improving the shielding performance in the closed state. In addition, since the rear end 32 of the lowest slat 3a is fixed to the bottom rail 5 (the slat fixing part 60 of the second weight 58), the lowest slat 3a follows the rotation of the bottom rail 5, preventing the lowest slat 3a from moving on the bottom rail 5 as it rotates. In this way, it is possible to improve the shielding performance in the closed state without compromising the design of the bottom rail 5.

[0061] Furthermore, as shown in Figure 5(B), in the shielded state, the suspension (load) position F1 of the first screen 1 is near the front side edge of the opening of the first plate housing 5a, and the suspension (load) position F2 of the second screen 2 is near the front side edge of the opening of the second plate housing 5b. Since these suspension positions F1 and F2 are on approximately the same straight line in the Y direction, the bottom rail 5 can be suspended stably in a more vertically upright position, and the shielded state can be maintained.

[0062] (Screen winding operation) Next, the winding operation of the screen 10 (first screen 1, second screen 2, and slat 3) will be explained.

[0063] From the shielded state of the slat 3 shown in Figures 3(A), 4(A), and 5(B), for example, when the front side of the operating cord 63 is pulled down, the winding pipe 61 rotates counterclockwise in the direction shown in Figure 3, and the screen 10 is wound up toward the headbox 4 side (upward in the Y direction).

[0064] As the screen 10 is wound up, as shown in Figure 2(A), the bottom rail 5 rotates along the circumferential surface of the winding pipe 61 as its curved portion 53 moves, while its inclined portion 59 enters the upper side of the headbox 4. The enlarged portion 52 then acts as a stopper between the bottom rail 5 and the headbox 4, restricting further winding of the bottom rail 5, or an upper limit stopper device (not shown) provided inside the winding pipe 61 restricts further winding of the bottom rail 5 at a preset stopping position.

[0065] As a result, when the screen 10 is rolled up to its maximum extent, the amount of exposure of the bottom rail 5 is minimized. Therefore, while achieving the improved shielding effect in the shielded state as described above, the dimensions when rolled up can be reduced, improving the appearance.

[0066] As described above, according to this embodiment, in the shading state, the blind 100 is configured such that the bottom rail 5 wraps around the first screen 1 and applies downward tension while standing upright, the lowest slat 3a does not obstruct the rotation of the bottom rail 5, and the second screen 2 assists the rotation of the bottom rail 5, thereby allowing the bottom rail 5 to stand more vertically and improving the shading performance in the shading state. Furthermore, even with this configuration, since the lowest slat 3a is fixed on the bottom rail 5, it is possible to prevent the lowest slat 3a from moving on the bottom rail 5 as the bottom rail 5 rotates, thereby preventing damage to the design.

[0067] <Second Embodiment> Next, a blind 100 according to a second embodiment of the present invention will be described. In this embodiment, parts common to the first embodiment are denoted by the same reference numerals, and their descriptions are omitted or simplified. Figure 6 is a side cross-sectional view showing the connection state between the bottom rail 5 and each screen of the blind 100 according to this embodiment.

[0068] In the first embodiment described above, the lowest slat 3a of the multiple slats 3 was fixed to a part of the second weight 58. However, the lowest slat 3a may be fixed in other ways, as long as at least a part of it is fixed to the bottom rail 5 and it is positioned on the bottom rail 5 and is not connected to the second screen 2.

[0069] For example, as shown in the figure, the second weight 58 may be removed from the second weight housing section 57, and the lowest slat 3a may be fixed to the slat fixing section 60 at the rear end of the curved section 53, for example, by adhesive, or it may be fixed to the bottom surface of the second weight housing section 57, for example, by adhesive.

[0070] This configuration also prevents the lowest slat 3a from obstructing the rotation of the bottom rail 5, and prevents the lowest slat 3a from moving on the bottom rail 5 as the bottom rail 5 rotates, thereby compromising the aesthetic appearance.

[0071] <Third Embodiment> Next, a blind according to the third embodiment of the present invention will be described. In this embodiment, parts common to the first and second embodiments are denoted by the same reference numerals, and their descriptions are omitted or simplified. Figure 7 is a side cross-sectional view showing the connection between the bottom rail 5 and each screen of the blind 100 according to this embodiment.

[0072] In the first and second embodiments described above, the lowest slat 3a was connected to the first screen 1 and not connected to the second screen 2. However, in this embodiment, the lowest slat 3a may be provided unconnected not only to the second screen 2 but also to the first screen 1.

[0073] In this case, at least the vicinity of the front end 31 is fixed to the slat fixing portion 60 of the front end (part of the enlarged portion 52) of the bottom rail 5.

[0074] With this configuration, the bottom slat 3a can be fixed to the bottom rail 5 independently of the first screen 1 and the second screen 2. Furthermore, the bottom rail 5 can be rotated without being affected by the bottom slat 3a.

[0075] <Variation> This technology is not limited to the embodiments described above, and can be modified in various ways without departing from the spirit of this technology.

[0076] In each of the embodiments described above, the enlarged portion 52 is formed in a curved shape from its front end to its rear end. However, the shape of the enlarged portion 52 is not limited to this, and it may be other shapes (for example, trapezoidal). Furthermore, if the lower end of the first screen 1 is turned at the front end of the bottom rail 5 and connected from its underside, the enlarged portion 52 may be omitted.

[0077] In each of the embodiments described above, the lowest slat 3a was fixed to the bottom rail 5, for example, by adhesive. However, the method of fixing the lowest slat 3a is not limited to adhesive. For example, the rear end 32 of the lowest slat 3a may be inserted into a slit or the like provided on the upper surface of the bottom rail 5 to fix it, or a separate housing section may be provided on the upper surface of the bottom rail 5, and the rear end 32 of the lowest slat 3a may be fixed to a plate similar to the first screen stopper plate 11 and the second screen stopper plate 21 and housed in the housing section to fix it.

[0078] Furthermore, in each of the embodiments described above, the rear connecting portion 22 (second plate housing portion 5b) at the lower end of the second screen 2 is provided between the first weight housing portion 55 and the second weight housing portion 57. However, the position of the rear connecting portion 22 is not limited to this, and it may be located anywhere closer to the center in the front-rear direction (Z direction) than the rear end in the width direction (Z direction) of the bottom rail 5. For example, it may be located further forward or further back than the position shown in each of the embodiments described above, and in this case, the shapes of the first weight housing portion 55 and the second weight housing portion 57 may also be changed as appropriate. In addition, at least one of the first weight housing portion 55 and the second weight housing portion 57 may be omitted. [Explanation of symbols]

[0079] 1…First screen (front lace fabric) 2…Second screen (back lace fabric) 3...Slat 3a...Bottom slat 4…Headbox 5…Bottom rail 5a...First plate housing section 5b...Second plate housing section 6…Opening and closing mechanism 9…Bracket 10…Screen 11…First screen retaining plate 12...Front side connection part 21…Second screen retaining plate 22...Rear side connection part 23... Plate cover 31... Front end of slat 32... Rear end of slat 41...Set frame 42... Side cover 43... Side Plate 50…Bottom cap 51...Bottom cover 52... Enormous portion 53…Curved surface part 54...Contact part 55...First weight storage section 56...First weight 57... Second weight storage section 58... Second weight 59…Slope part 60... Slat fixing part 61... Retractable pipe 62...Operation Unit 63... Operation Code 100...Blinds F1, F2... Hanging position S... Screw

Claims

1. Multiple slats arranged in the vertical direction, A light-transmitting first shielding material is provided on the front side of the plurality of slats, A light-transmitting second shielding material is provided on the rear side of the plurality of slats, facing the first shielding material, A bottom rail to which the lower ends of the first and second shielding materials are connected, the bottom rail having a connecting portion to which the lower end of the first shielding material, which has been turned at the front end of the bottom rail, can be connected from the lower surface side of the bottom rail, An opening and closing mechanism is provided to allow the first and second shielding materials to be wound up and unwound so that the plurality of slats can be opened and closed, and to move the first and second shielding materials relative to each other so that the front ends face downward when the plurality of slats are in a shielding state where they are substantially vertical, A blind equipped with [a certain feature].

2. A blind according to claim 1, The bottom rail has a continuously expanding portion formed from the front end towards the rear. BLIND.

3. A blind according to claim 2, The aforementioned enlarged portion is formed in a curved shape from its front surface to its upper surface. BLIND.

4. A blind according to claim 2, The connecting portion is formed in the internal space of the enlarged portion. BLIND.

5. A blind according to claim 2, The opening and closing mechanism has a winding pipe to which the upper ends of the first and second shielding materials are connected. The bottom rail has a curved portion from the enlarged portion to its rear end that conforms to the circumferential surface of the first and second shielding materials wound around the winding pipe. BLIND.

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