Roller blinds

Abstract

To provide a roll screen in which a winding diameter of a fastener is made equal to or smaller than a winding diameter of a screen body, in a roll screen in which fasteners are provided on both sides of the screen body and guide frames provided on both sides of the window frame are configured to guide the fasteners.SOLUTION: The take-up drum is provided with a drum body 18 mounted in a head box, and an enlarged diameter cylinder body 19 fixed to the outer peripheral surface of the drum body so that both ends of the drum body are exposed to expand the diameter of the drum body. The enlarged diameter cylinder body consists of a pair of half-split members divided in half. By combining the pair of half-split members with the drum body positioned between the pair of half-split members, the enlarged diameter cylinder body is fixed to the drum body. When the screen body is wound on the take-up drum, only the screen body comes into contact with the enlarged diameter cylinder body and is wound without a first and a second fasteners 21 and 22 coming into contact with the enlarged diameter cylinder body.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a roll screen in which a screen body is retractably wound around a winding drum rotatably mounted within a head box, first and second fasteners are provided on both side edges of the screen body, and first and second guide frames provided along both side edges of the window frame are configured to guide the first and second fasteners. [Background technology]

[0002] Conventionally, a roll screen device has been disclosed in which a fastener part is provided on the side of a screen wound around a roller whose both ends are rotatably supported on a winding case, a fastener part is provided on the side of a joint piece to connect the screen, a guide sheet whose base end is fixed to the roller is wound around the roller together with the screen, and a winding means rotates the roller to cause the roller to wind up the screen (see, for example, Patent Document 1 (Claim 3, paragraphs

[0015] ,

[0021] ,

[0023] , Fig. 1, Fig. 3 to Fig. 7)). In this roll screen device, the guide sheet is attached to the roller at a position excluding the fastener part of the screen, and the thickness part of the fastener part at the end of the screen is corrected so that the screen is always wound up horizontally. The guide sheet is a sheet formed from a synthetic resin plate or a synthetic resin foam, and is formed to have a curling plate thickness of 2.5 to 3.5 mm. The guide sheet is fixed to the surface of the roll and has a length that substantially surrounds the circumference of the roll, and a width that is smaller than the width of the screen but smaller than the width of the fasteners at both ends.

[0003] In the roller screen device configured in this manner, the guide sheet is attached to the roller surface portion excluding the fastener portion of the screen, so that when the screen is rolled up, the diameter of the fastener portion and the portion excluding the fastener portion are almost the same. As a result, the screen can be rolled up in a well-balanced manner, so the roll-up mechanism of the roller screen device is less likely to break down. Also, at the start of rolling up the screen, the screen and the guide sheet overlap, and the thickness of the guide sheet is slightly thicker than the fastener portion, so the portion other than the fastener portion is slightly thicker than the fastener portion. On the other hand, at the end of rolling up the screen, the fastener portions overlap, so the portions other than the fastener portion are the same. As a result, no imbalance occurs even during the rolling up of the screen, and the screen can be rolled up horizontally and smoothly. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2006-296627 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the roller screen device shown in the above Patent Document 1, when the overall length of the screen is long, in order to make the diameter of the portion where the fastener portion is wound up and the diameter of the portion where the screen other than the fastener portion is wound up almost the same when the screen is wound up on the roller, it is necessary to form a thick resin guide sheet, or to reduce the winding diameter of the roller in order to store the roller compactly. However, when the resin guide sheet is made thick, the radius of curvature of the curled guide sheet when wound up on the roller becomes significantly larger than the radius of the roller, which causes problems such as an increase in the number of steps for assembling the guide sheet to the roller and the number of steps for fixing the guide sheet to the roller, and when the guide sheet is wound up on a roller with a small diameter, the repulsive force of the guide sheet makes it difficult to wind the guide sheet around the roller, and the guide sheet cannot be stably wound up on the roller.

[0006] The first object of the present invention is to provide a roll screen in which the diameter expansion cylinder can be easily fixed to the drum body even if the overall length of the screen body is long, and the winding diameter of the first and second fasteners can be made equal to or smaller than the winding diameter of the screen body. The second object of the present invention is to provide a roll screen in which the diameter expansion cylinder can be fixed to the drum body by combining a pair of half-split members even if the dimensional tolerance (dimensional allowance) of the outer diameter of the drum body and the inner diameter of the diameter expansion cylinder is relatively large. The third object of the present invention is to provide a roll screen in which the diameter expansion cylinder can be assembled using a pair of half-split members of the same shape, thereby reducing the number of parts. The fourth object of the present invention is to provide a roll screen in which the number of parts can be reduced by integrally molding a pair of half-split members in a state where they are connected by an integral hinge. The fifth object of the present invention is to provide a roll screen in which a first convex strip having a substantially I-shaped cross section is formed on the inner peripheral surface of one of the pair of half-split members, and a first concave strip capable of accommodating the first convex strip is formed on the outer peripheral surface of the drum body, thereby reliably preventing the pair of half-split members from rotating relative to the drum body. A sixth object of the present invention is to provide a roll screen which can prevent the pair of half members from rotating relative to the drum body and can prevent the pair of half members from falling off the drum body by forming a second concave stripe or second convex stripe having a substantially mushroom-shaped cross section on the inner peripheral surface of either or both of a pair of half members and forming a second convex stripe or second concave stripe having a substantially mushroom-shaped cross section on the outer peripheral surface of the drum body into which the second concave stripe or second convex stripe can be fitted or inserted.A seventh object of the present invention is to provide a roll screen which can reduce the number of steps for assembling the screen body to the winding drum and can reliably prevent the screen body from falling off the winding drum by attaching a third fastener to the mounting end of the screen body to the winding drum and inserting the third fastener into a groove formed in one of the pair of half members. [Means for solving the problem]

[0007] As shown in Figs. 1, 2 and 8, the first aspect of the present invention is a screen having a winding drum 13 rotatably attached within a head box 12 provided along the upper edge of a window frame 11, a screen body 16 that is reeled out and wound around the winding drum 13 and has a bottom bar 14 attached to its lower end, first and second fasteners 21, 22 attached to both side edges of the screen body 16, and first and second guide frames 31 provided along both side edges of the window frame 11 to guide the first and second fasteners 21, 22. , 32, the winding drum 13 has a drum body 18 rotatably attached in the head box 12, and a diameter expanding cylinder 19 fixed to the outer circumferential surface of the drum body 18 so that both ends of the drum body 18 are exposed and expands the diameter of the drum body 18, and the diameter expanding cylinder 19 is composed of a pair of half members 23, 24 divided in half on a plane including its center line, and the pair of half members 23, 24 are combined with the drum body 18 positioned between them. height, The diameter expanding cylinder 19 is fixed to the drum body 18, and when the screen body 16 is wound on the winding drum 13, the first and second fasteners 21, 22 do not come into contact with the diameter expanding cylinder 19, and only the screen body 16 comes into contact with the diameter expanding cylinder 19 and is wound. The entire outer circumferential surface of the drum body is covered by the enlarged diameter cylinder. It is characterized by:

[0008] The second aspect of the present invention is an invention based on the first aspect, and is further characterized in that, as shown in Figures 1 and 2, the length of the expansion cylinder 19 is formed to be smaller than the width of the screen main body 16 excluding the width of the first and second fasteners 21, 22 attached to both side edges of the screen main body 16.

[0009] A third aspect of the present invention is an invention based on the first or second aspect, and further, as shown in FIG. 1, a pair of half-split members 23, 24 are formed to have the same shape and size, and locking pieces 23d, 24d and locked portions 23e, 24e are respectively provided on opposing surfaces of the pair of half-split members 23, 24 over the entire length of the pair of half-split members 23, 24, and one half-split member 23 of the pair of half-split members 23, 24 is turned upside down and left-right to change the shape of the pair of half-split members 23, 24. With the drum body 18 positioned therebetween, the locking piece 23d of one half-member 23 is locked to the locked portion 24e of the other half-member 24, and the locking piece 24d of the other half-member 24 is locked to the locked portion 23e of one half-member 23, and the inner surfaces of the pair of half-members 23, 24 are fixed to the outer surface of the drum body 18 with a fixing member 27, thereby combining the pair of half-members 23, 24 and fixing the expansion cylinder 19 to the drum body 18.

[0010] A fourth aspect of the present invention is an invention based on the first or second aspect, and is further characterized in that, as shown in Figure 11, a pair of half-split members 113, 114 are integrally molded in a state where they are connected to each other by an integral hinge 115, a locking piece 23d is protruding from one of the pair of half-split members 113, 114, and a locking portion 24e with which the locking piece 23d can engage is protruding from the other half-split member 114, and with the drum main body 18 positioned between the pair of half-split members 113, 114, the locking piece 23d is engaged with the locking portion 24e, and the inner surface of either one of the pair of half-split members 113, 114 is fixed to the outer peripheral surface of the drum main body 18 by a fixing member 27, whereby the pair of half-split members 113, 114 are combined and the expansion cylinder 109 is fixed to the drum main body 18.

[0011] A fifth aspect of the present invention is an invention based on the third or fourth aspect, further characterized in that, as shown in FIG. 1, the fixing member is a double-sided adhesive tape 27 that attaches the inner surfaces of the pair of half members 23, 24 to the outer surface of the drum body 28.

[0012] A sixth aspect of the present invention is an invention based on the fifth aspect, and is further characterized in that, as shown in Figure 10, a first convex rib 94a or a first concave rib is protruded from the inner surface of either one of the pair of half members 93, 94, facing toward the radially inward or outward direction of the expansion cylinder 89 and extending along the entire length of the one of the half members 93, 94, and a first concave rib 18a or a first convex rib is formed on the outer surface of the drum main body 18 along the entire length of the drum main body 18, into which the first convex rib 94a or first concave rib can be loosely inserted or fitted.

[0013] A seventh aspect of the present invention is an invention based on the third or fourth aspect, and is further characterized in that, as shown in Figure 12, the fixing member 137 has a second concave rib 137a or a second convex rib, which has a generally mushroom-shaped cross section and is provided along the entire length of the inner surface of either or both of the pair of half members 133, 134, and a second convex rib 137b or a second concave rib, which has a generally mushroom-shaped cross section and is provided on the outer surface of the drum main body 138, into which the second concave rib 137a or second convex rib can be fitted or inserted.

[0014] An eighth aspect of the present invention is an invention based on any of the first to seventh aspects, and is further characterized in that, as shown in Figure 9, a longitudinally extending groove 73a, 74a is formed along the entire length of the outer peripheral surface of either or both of a pair of half members 73, 74, a third fastener 63 is attached to the mounting end of the screen body 16 to the winding drum, and the screen body 16 is attached to the expansion cylinder 69 by inserting this third fastener 63 into the groove 73a. Effect of the Invention

[0015] In the roll screen of the first aspect of the present invention, the winding drum has a drum body rotatably mounted in a head box, and a diameter expanding cylinder fixed to the outer circumferential surface of the drum body so that both ends of the drum body are exposed and expands the diameter of the drum body, the diameter expanding cylinder is made of a pair of half members divided in half by a plane including its center line, and the pair of half members are combined with the drum body positioned between them to fix the diameter expanding cylinder to the drum body, so that even if the first and second fasteners are thicker than the screen body, the winding diameter of the first and second fasteners when the screen body is wound up on the winding drum together with the first and second fasteners can be made equal to or smaller than the winding diameter of the screen body. As a result, the screen body can be wound up on the winding drum together with the first and second fasteners in a well-balanced manner. Furthermore, compared to conventional roll screen devices that have the drawback that, when the resin guide sheet is made thicker to increase the overall length of the screen, the radius of curvature of the curl becomes significantly larger than the radius of the roller, increasing the labor required to assemble and fix the guide sheet to the roller, and that, when the guide sheet is wound around a roller with a small diameter, the guide sheet is difficult to wind around the roller due to its repulsive force, making it impossible to stably wind the guide sheet around the roller, in the present invention, even if the overall length of the screen body is increased, the expansion cylinder can be easily fixed to the drum body by simply changing the shape of a pair of half-split members to change the outer diameter relative to the inner diameter of the expansion cylinder.

[0016] In the roll screen according to the second aspect of the present invention, the length of the diameter expanding cylinder is formed smaller than the width of the screen main body excluding the first and second fasteners attached to both side edges of the screen main body, so that when the screen main body is wound up on the winding drum, the first and second fasteners do not come into contact with the diameter expanding cylinder, and only the screen main body comes into contact with the diameter expanding cylinder and is wound up. As a result, as in the above, even if the first and second fasteners are thicker than the screen main body, the winding diameter of the first and second fasteners when the screen main body is wound up on the winding drum together with the first and second fasteners can be made equal to or smaller than the winding diameter of the screen main body, so that the screen main body can be wound up on the winding drum together with the first and second fasteners in a well-balanced manner.

[0017] In the third aspect of the present invention, the pair of half members are formed to have the same shape and size, and the locking piece and the locked part are respectively provided on the opposing surfaces of the pair of half members. In this state, one of the pair of half members is inverted upside down and left to right to position the drum body between the pair of half members, and the locking piece of one half member is locked to the locked part of the other half member, and the locking piece of the other half member is locked to the locked part of the one half member, and the inner peripheral surface of the pair of half members is fixed to the outer peripheral surface of the drum body with a fixing member, so that the pair of half members are combined and the expanding cylinder is fixed to the drum body. As a result, even if the dimensional tolerance (dimensional tolerance) of the outer diameter of the drum body and the inner diameter of the expanding cylinder is relatively large, the pair of half members can be combined and the expanding cylinder can be fixed to the drum body. In addition, since the expanding cylinder can be assembled using a pair of half members of the same shape, the number of parts can be reduced and parts management can be easily performed.

[0018] In the roller screen according to the fourth aspect of the present invention, a pair of half members are integrally molded in a state where they are connected to each other by an integral hinge, and a locking piece is protruding from one of the pair of half members, and a locking portion with which the locking piece can be engaged is protruding from the other half member. With the drum body positioned between the pair of half members, the locking piece is locked to the locking portion, and the inner peripheral surfaces of the pair of half members are fixed to the outer peripheral surface of the drum body by a fixing member, so that the pair of half members are combined and the expanding cylinder is fixed to the drum body. As a result, even if the dimensional tolerance (dimensional allowance) of the outer diameter of the drum body and the inner diameter of the expanding cylinder is relatively large, the pair of half members can be combined and the expanding cylinder can be fixed to the drum body. In addition, since the pair of half members are integrally molded in a state where they are connected to each other by an integral hinge, the number of parts can be reduced.

[0019] In the roller screen of the fifth aspect of the present invention, the fixing member is a double-sided adhesive tape that attaches the inner surfaces of the pair of halved members to the outer peripheral surface of the drum body. By attaching the inner surfaces of the pair of halved members to the outer peripheral surface of the drum body with the double-sided adhesive tape, it is possible to prevent the pair of halved members from rotating relative to the drum body and to prevent the pair of halved members from falling off the drum body.

[0020] In the roller screen of the sixth aspect of the present invention, a first convex strip or a first concave strip is protruded from the inner peripheral surface of one of the pair of half members, and a first concave strip or a first convex strip into which the first convex strip or the first concave strip is loosely inserted or fitted is formed on the outer peripheral surface of the drum body, so that by combining the pair of half members with the first convex strip or the first concave strip of one half member loosely inserted or fitted into the first concave strip or the first convex strip of the drum body, the expansion cylinder is prevented from rotating relative to the drum body. As a result, the pair of half members are positioned in the circumferential direction of the drum body.

[0021] In the roller screen of the seventh aspect of the present invention, the fixing member has a second concave or convex stripe having an approximately mushroom-shaped cross section extending over the entire length of the inner surface of either or both of the pair of half members, and a second convex or concave stripe having an approximately mushroom-shaped cross section provided on the outer surface of the drum body into which the second concave or convex stripe can be fitted or inserted.Therefore, by fitting or inserting the second concave or convex stripe of the half member into the second convex or concave stripe of the drum body, it is possible to prevent the pair of half members from rotating relative to the drum body and to prevent the pair of half members from falling off the drum body.

[0022] In the roll screen of the eighth aspect of the present invention, a groove is formed in the outer peripheral surface of either one or both of the pair of half members, and a third fastener is attached to the mounting end of the screen body to the winding drum, so that the screen body is mounted to the expanding diameter cylinder by inserting this third fastener into the groove. As a result, compared to the case where the screen body is attached to the outer peripheral surface of the winding drum with double-sided adhesive tape, the number of steps for assembling the screen body to the winding drum can be reduced, and unintentional detachment of the screen body from the winding drum can be reliably prevented. [Brief description of the drawings]

[0023] [Figure 1] 5A to 5C are cross-sectional views showing a procedure for fixing a diameter-expanding cylinder of the roller screen of the first embodiment of the present invention to a drum main body. [Diagram 2] 8 when the screen body is partially wound up, and FIG. 9(b) is an enlarged cross-sectional view of a part B in FIG. 8 when the screen body is partially wound up. [Diagram 3] 8 is a cross-sectional view taken along line CC in FIG. 7. [Figure 4] 8 is a cross-sectional view taken along line DD in FIG. 7. [Diagram 5] 4 is a cross-sectional view taken along line EE in FIG. [Figure 6] 5 is a cross-sectional view taken along the line FF in FIG. 4. [Figure 7] FIG. 11 is a front view showing a state in which a pair of first side elastic members and a pair of second side elastic members of the roller screen are arranged in a staggered pattern on the first and second inner rails. [Figure 8] FIG. 2 is a front view with essential parts cut away, showing the roller blind attached to a window frame. [Figure 9] 10 is a cross-sectional view corresponding to FIG. 1, showing a procedure for fixing a diameter expansion cylinder of a roller screen according to a second embodiment of the present invention to a drum main body. [Figure 10] 10 is a cross-sectional view corresponding to FIG. 1, showing a procedure for fixing a diameter expansion cylinder of a roller screen according to a third embodiment of the present invention to a drum main body. [Figure 11]10 is a cross-sectional view corresponding to FIG. 1, showing a procedure for fixing a diameter-expanding cylinder of a roller screen according to a fourth embodiment of the present invention to a drum main body. [Figure 12] 11 , showing the first half of the procedure for fixing the diameter expansion cylinder of the roller screen of the fifth embodiment of the present invention to the drum main body. FIG. [Figure 13] 1 , showing the latter half of the procedure for fixing the diameter-expanding cylinder of the roll screen to the drum main body. FIG. [Figure 14] FIG. 11(c) is a cross-sectional view showing a state in which a diameter-expanding cylinder of a roller screen according to a sixth embodiment of the present invention is fixed to a drum main body. [Figure 15] 10 is a cross-sectional view corresponding to FIG. 1, showing a procedure for fixing a diameter-expanding cylinder of a roller screen according to a seventh embodiment of the present invention to a drum main body. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Next, an embodiment of the present invention will be described with reference to the drawings.

[0025] <First embodiment> 8, the roll screen 10 comprises a winding drum 13 rotatably attached in a head box 12 provided along the upper edge of a window frame 11 of a railway vehicle or the like, a screen body 16 that is unreelably wound around the winding drum 13 and has a bottom bar 14 attached to its lower end, first and second fasteners 21, 22 provided on both side edges of the screen body 16, respectively, and first and second guide frames 31, 32 provided along both side edges of the window frame 11 so as to guide the first and second fasteners 21, 22. The head box 12 extends horizontally below the lower surface of the upper frame part 11a of the window frame 11 and is attached by a bracket 17, and both ends of the winding drum 13 are rotatably attached to both side walls 12a, 12a of the head box 12 while being housed in the head box 12.

[0026] The winding drum 13 has a drum body 18 rotatably mounted in the head box 12, and a diameter expanding cylinder 19 fixed to the outer circumferential surface of the drum body 18 so that both ends of the drum body 18 are exposed and expands the diameter of the drum body 18. The drum body 18 is formed into a substantially cylindrical shape by extrusion or pultrusion of an aluminum alloy or the like. The diameter expanding cylinder 19 is formed of a pair of half-split members 23, 24 divided in half on a plane including the center line, and in this embodiment, the pair of half-split members 24, 24 are formed to have the same shape and size. These half-split members 23, 24 are each produced by cutting a long material formed by extrusion molding of a plastic such as hard polyvinyl chloride, polycarbonate, or ABS (acrylonitrile butadiene styrene) to the same length. Furthermore, the attachment end of the screen body 16 to the winding drum 13 is attached to the outer circumferential surface of the diameter expanding cylinder 19 of the winding drum 13 with a double-sided adhesive tape 25 (FIG. 1(d)).

[0027] The pair of half-split members 23, 24 each have a semi-cylindrical outer semi-cylindrical portion 23a, 24a, a plurality of ribs 23b, 24b extending in the longitudinal direction and spaced apart in the circumferential direction on the curved inner surface of the outer semi-cylindrical portion 23a, 24a, and a plurality of curved abutment portions 23c, 24c provided at the tips of the ribs 23b, 24b, respectively, and whose inner surfaces have substantially the same radius of curvature as the outer radius of the drum main body 18 (FIG. 1). The center of the radius of curvature of the inner surfaces of the curved abutment portions 23c, 24c substantially coincides with the center of the radius of curvature of the outer semi-cylindrical portions 23a, 24a, and the inner peripheral surfaces of the curved abutment portions 23c, 24c abut (make surface contact) with the outer peripheral surface of the drum main body 18. 1(a) to 1(c), in a state in which one half member 23 is turned upside down and then turned left-right, the locking piece 23d is provided on the upper edge of the one half member 23 along the entire length of the one half member 23 and protrudes toward the other half member 24, and the locked portion 23e is provided on the lower edge of the one half member 23 along the entire length of the one half member 23 and protrudes toward approximately the center of the one half member 23. In addition, a locking piece 24d is provided on the lower edge of the other half member 24, protruding along the entire length of the other half member 24 toward one half member 23, and a locked portion 24e is provided on the upper edge of the other half member 24, protruding along the entire length of the other half member 24 toward approximately the center of the other half member 24.

[0028] On the other hand, the first fastener 21 is attached to the left edge of the screen body 16 by sewing, and the second fastener 22 is attached to the right edge of the screen body 16 by sewing (FIGS. 3 to 6). The first and second fasteners 21, 22 are formed to have the same shape and size. The first fastener 21 has a first chain portion 21a formed by arranging a plurality of first links 21b in the longitudinal direction, and a first tape portion 21d that holds the plurality of first links 21b (FIGS. 2 and 4). The plurality of first links 21b are formed with a first circular concave stripe 21c that communicates with these first links 21b, and the first tape portion 21d is formed with a first circular convex stripe 21e that is inserted into the first circular concave stripe 21c, and a first band cloth portion 21f that is provided integrally with the first circular convex stripe 21e. On the other hand, the second fastener 22 has a second chain portion 22a formed by arranging a plurality of second links 22b in the longitudinal direction, and a second tape portion 22d that holds the plurality of second links 22b (FIGS. 4 and 6). The plurality of second links 22b are formed with a second circular concave strip 22c that communicates with the second links 22b, and the second tape portion 22d is formed with a second circular convex strip 22e that is inserted into the second circular concave strip 22c, and a second band cloth portion 22f that is integrally provided with the second circular convex strip 22e. When the screen main body 16 is wound up on the winding drum 13, the first chain portion 21a and the first tape portion 21d of the first fastener 21 and the second chain portion 22a and the second tape portion 22d of the second fastener 22 do not come into contact with the expanding diameter cylinder 19, and only the screen main body 16 is wound up in contact with the expanding diameter cylinder 19 (FIG. 2). Specifically, the length of the expansion cylinder 19 is formed to be smaller than the width of the screen main body 16 excluding the first chain portion 21a and first tape portion 21d of the first fastener 21 and the second chain portion 22a and second tape portion 22d of the second fastener 22 attached to both side edges of the screen main body 16.

[0029] Meanwhile, a torsion coil spring 26 is provided inside the winding drum 13 for biasing the screen body 16 in a direction for winding it up onto the winding drum 13. Here, the rotation of the winding drum 13 when the screen body 16 is unwound from the winding drum 13 resists the elastic force (torque) of the torsion coil spring 26 but is supported by the weight of the screen body 16 and the bottom bar 14, and the rotation of the winding drum 13 when the screen body 16 is wound up onto the winding drum 13 is supported by the elastic force (torque) generated by the release of elastic energy stored in the torsion coil spring 26. This reduces the operating force required when unwinding the screen body 16 from the winding drum 13 and when winding the screen body 16 onto the winding drum 13.

[0030] Meanwhile, the first and second guide frames 31, 32 are formed to be the same shape and size from an aluminum alloy, a steel plate, or the like (Figs. 3 and 4). The first guide frame 31 is attached to the inner surface of the left frame portion 11b of the window frame 11 (Fig. 3), and the second guide frame 32 is attached to the inner surface of the right frame portion 11c of the window frame 11 (Fig. 4). Furthermore, the first guide frame 31 is formed to be approximately C-shaped in cross section (Fig. 3), and the second guide frame 32 is formed to be approximately inverted C-shaped in cross section (Fig. 4).

[0031] First and second inner rails 41, 42 are loosely inserted into the first and second guide frames 31, 32, respectively, extending in the longitudinal direction of the first and second guide frames 31, 32, and the first and second inner rails 41, 42 are configured to slidably hold the first chain portion 21a of the first fastener 21 and the second chain portion 22a of the second fastener 22, respectively (FIGS. 3 to 6 and 8). The first and second inner rails 41, 42 are formed of the same shape and size from hard plastic, such as hard polyvinyl chloride, polycarbonate, ABS, or the like (FIGS. 3 and 4), and are configured to be elastically deformable in the width direction of the screen body 16 within the first and second guide frames 31, 32. In addition, a plurality of first side elastic members 51a are interposed between the first inner rail 41 and the first guide frame 31 (FIGS. 3 and 5), and these first side elastic members 51a are attached to the first inner rail 41 at intervals in the longitudinal direction (FIG. 7). These first side elastic members 51a are configured to relieve excessive tension in the width direction of the screen main body 16. A plurality of second side elastic members 52a are interposed between the second inner rail 42 and the second guide frame 32 (FIGS. 4 and 6), and these second side elastic members 52a are attached to the second inner rail 42 at intervals in the longitudinal direction (FIG. 7). These second side elastic members 52a are configured to relieve excessive tension in the width direction of the screen main body 16. Furthermore, the plurality of first side elastic members 51a and the plurality of second side elastic members 52a are arranged in a staggered pattern so as to be asymmetrically positioned in the longitudinal direction of the first and second inner rails 41, 42 (FIG. 7). This allows the first and second inner rails 41, 42 to alternately generate tension and slack in the width direction of both side edges of the screen body 16 on the left and right, and prevents excessive tension from being generated on both side edges at line-symmetric positions in the width direction of the screen body 16, making it possible to smoothly lower the screen body 16 without increasing the weight of the bottom bar 14. Note that reference numeral 51b in Figures 3 and 5 denotes a first rear elastic member, and reference numeral 52b in Figures 4 and 6 denotes a second rear elastic member.

[0032] A method for fixing the expanding cylinder 19 to the drum body 18 thus configured will be described. With the drum body 18 positioned between the pair of half members 23, 24, the pair of half members 23, 24 are combined to fix the expanding cylinder 19 to the drum body 18. Specifically, first, one half member 23 of the pair of half members 23, 24 is turned upside down and left-right to position the drum body 18 between the pair of half members 23, 24 (FIG. 1(c)). Next, the locking piece 23d of one half member 23 is locked to the locked portion 24e of the other half member 24, and the locking piece 24d of the other half member 24 is locked to the locked portion 23e of the one half member 23 (FIG. 1(d)), and the inner peripheral surfaces of the pair of half members 23, 24 are attached to the outer peripheral surface of the drum body 18 with a double-sided adhesive tape 27 (fixing member). At this time, one side of the double-sided adhesive tape 27 is affixed to the entire curved inner surface of the curved abutment parts 23c, 24c of the pair of half-split members 23, 24 or partially at a predetermined interval, and the other side of the double-sided adhesive tape 27 is affixed to the outer circumferential surface of the drum body. This causes the pair of half-split members 23, 24 to be combined, and the expandable cylinder 19 is fixed to the drum body 18. As a result, even if the dimensional tolerance (dimensional allowance) of the outer diameter of the drum body 18 and the inner diameter of the expandable cylinder 19 is relatively large, the pair of half-split members 23, 24 can be combined to fix the expandable cylinder 19 to the drum body 18. In addition, since the expandable cylinder 19 can be assembled using a pair of half-split members 23, 24 having the same shape, the number of types of parts can be reduced, and parts management can be easily performed.

[0033] The operation of the roller blind 10 thus configured will be described below. When the bottom bar 14 is grasped and pushed up, the rotation of the winding drum 13 in the direction in which the screen main body 16 is wound up is assisted by the elastic force (torque) generated by the release of the elastic energy stored in the torsion coil spring 26, so that even if the force pushing up the bottom bar 14 is small, the screen main body 16 is wound up by the winding drum 13 and the bottom bar 14 rises smoothly. At this time, the length of the expanding cylinder 19 is formed smaller than the width of the screen main body 16 excluding the first and second fasteners 21, 22 provided on both side edges of the screen main body 16, and the expanding cylinder 19 is fixed to the outer circumferential surface of the drum main body 13 so that both ends of the drum main body 13 are exposed. Therefore, the first and second fasteners 21, 22 do not come into contact with the expanding cylinder 19, and only the screen main body 16 comes into contact with the expanding cylinder 19 and is wound up. Therefore, even if the first and second fasteners 21, 22 are thicker than the screen main body 16, the winding diameter of the first and second fasteners 21, 22 when the screen main body 16 is wound up on the winding drum 13 together with the first and second fasteners 21, 22 can be made equal to or smaller than the winding diameter of the screen main body 16. As a result, the screen main body 16 can be wound up on the winding drum 13 together with the first and second fasteners 21, 22 in a well-balanced manner.

[0034] Furthermore, in conventional roll screen devices, when the resin guide sheet is made thicker to increase the overall length of the screen, the radius of curvature of the curl becomes significantly larger than the radius of the roller, resulting in an increase in the labor required to assemble and fix the guide sheet to the roller, and when the guide sheet is wound around a roller with a small diameter, the guide sheet is difficult to wind around the roller due to its repulsive force, making it impossible to stably wind the guide sheet around the roller.In contrast, in the roll screen 10 of this embodiment, even if the overall length of the screen body 16 is increased, the expandable cylinder 19 can be easily fixed to the drum body 13 simply by changing the shape of the pair of half members 23, 24 to change the outer diameter relative to the inner diameter of the expandable cylinder 19.

[0035] <Second embodiment> Fig. 9 shows a second embodiment of the present invention. In Fig. 9, the same reference numerals as in Fig. 1 indicate the same parts. In this embodiment, grooves 73a, 74a extending in the longitudinal direction are formed over the entire length on the outer circumferential surfaces of both of a pair of half members 73, 74, and a third fastener 63 is attached to the attachment end of the screen main body 16 to the winding drum. Then, the screen main body 16 is attached to the expansion cylinder 69 by inserting the third fastener 63 into the groove 73a. The above-mentioned grooves 73a, 74a are formed by two ribs 73b, 73b, 74b, 74b protruding parallel to each other at a predetermined interval in the circumferential direction from approximately the circumferential center of the curved inner surface of the outer semi-cylindrical portion of the half-split member 73, 74, instead of the single rib formed at approximately the circumferential center of the curved inner surface of the outer semi-cylindrical portion of the half-split member in the first embodiment, curved abutment portions 23c, 24c provided at the tips of these ribs 73b, 73b, 74b, 74b and having an inner surface with a radius of curvature approximately the same as the outer radius of the drum main body 69, and a slit 73c, 74c formed in the outer semi-cylindrical portion 23a, 24a so as to be located in the circumferential center between the two ribs 73b, 73b, 74b, 74b. Similarly to the first and second fasteners, the third fastener 63 has a third chain portion 63a and a third tape portion 63b, and is attached by sewing the tape portion 63b to the attachment end portion of the screen body 16 to the winding drum. Other than the above, the third fastener 63 is configured in the same manner as the first embodiment.

[0036] In the roll screen thus configured, instead of the process of attaching the mounting end of the screen body to the winding drum to the outer circumferential surface of the diameter expanding cylinder of the winding drum with double-sided adhesive tape in the first embodiment, a process is added in which the third chain portion 63a of the third fastener 63 attached to the mounting end of the screen body 16 to the winding drum is inserted into one of a pair of grooves 73a, 74a formed on the outer circumferential surfaces of both of the pair of half members 73, 74, so that the screen body 16 is attached to the diameter expanding cylinder 69. As a result, the number of steps for assembling the screen body 16 to the winding drum can be reduced compared to the first embodiment, and unintentional detachment of the screen body 16 from the winding drum can be reliably prevented. Operations other than those described above are substantially the same as those in the first embodiment, so repeated explanations will be omitted.

[0037] <Third embodiment> Fig. 10 shows a third embodiment of the present invention. In Fig. 10, the same reference numerals as in Fig. 1 indicate the same parts. In this embodiment, a first convex rib 94a having a substantially I-shaped cross section is provided on the inner peripheral surface of one of the pair of half members 93, 94, i.e., the left half member 94 in this embodiment, protruding toward the radially inward direction of the enlarged diameter cylinder 89 and over the entire length of the left half member 94. In addition, a first concave rib 18a into which the first convex rib 94a can be loosely inserted is formed on the outer peripheral surface of the drum body 18 over the entire length of the drum body 18. Other than the above, the third embodiment is configured in the same manner as the first embodiment.

[0038] A method of fixing the enlarged diameter cylinder 89 to the drum body 18 thus configured will be described. First, the drum body 18 is positioned between the left half member 94 on which the first convex rib 94a of the pair of half members 93, 94 is protruding, and the right half member 93 on which the first convex rib 94a is not protruding. Next, the first convex rib 94a protruding from the left half member 94 is loosely inserted into the first concave rib 18a of the drum body 18 (FIG. 10(b)). Next, the locking piece 23d of the right half member 93 is locked to the locked portion 24e of the left half member 94, and the locking piece 23d of the right half member 93 is locked to the locked portion 24e of the left half member 94 (FIG. 10(c)), and the inner peripheral surfaces of the pair of half members 93, 94 are attached to the outer peripheral surface of the drum body 18 with a double-sided adhesive tape 27 (fixing member). As a result, the pair of half-split members 93, 94 are combined, and the diameter-expanding cylinder 89 is fixed to the drum body 18. As a result, even if the dimensional tolerance (dimensional allowance) of the outer diameter of the drum body 18 and the inner diameter of the diameter-expanding cylinder 89 is relatively large, the pair of half-split members 93, 94 can be combined to fix the diameter-expanding cylinder 89 to the drum body 18. Furthermore, the relative rotation of the diameter-expanding cylinder 89 with respect to the drum body 18 is prevented, and the pair of half-split members 93, 94 are positioned in the circumferential direction of the drum body 18. Furthermore, by attaching the inner peripheral surfaces of the pair of half-split members 93, 94 to the outer peripheral surface of the drum body 18 with the double-sided adhesive tape 27, the diameter-expanding cylinder 89 can be prevented from shifting in the longitudinal direction of the drum body 18. The operation of the roll screen configured in this manner is substantially the same as that of the first embodiment, so repeated explanation will be omitted.

[0039] <Fourth embodiment> Fig. 11 shows a fourth embodiment of the present invention. In Fig. 11, the same reference numerals as in Fig. 1 indicate the same parts. In this embodiment, a pair of half-split members 113, 114 are connected to each other by an integral hinge 115 and are integrally molded by extrusion molding of plastic such as hard polyvinyl chloride, polycarbonate, ABS (acrylonitrile butadiene styrene), etc. In addition, one half-split member 113 of the pair of half-split members 113, 114, in this embodiment, has a locking piece 23d at the upper edge of the right half-split member 113, which protrudes over the entire length of the right half-split member 113 and toward the left half-split member 114, and a locked portion 24e with which the locking piece 23d can be engaged is provided at the upper edge of the left half-split member 114, which protrudes over the entire length of the left half-split member 114 and toward the center of the left half-split member 114. On the other hand, at the portion where the pair of half members 113, 114 are connected to each other by the integral hinge 115, no locking piece or locked piece is protruded.

[0040] The integral hinge 115 is formed thinner than the thickness of the outer semi-cylindrical parts 23a, 24a of the pair of half members 113, 114 so that it can be elastically deformed. In addition, the left half member 114 has a first protruding rib 94a protruding from its inner peripheral surface toward the center of the enlarged diameter cylinder 109 and over the entire length of the left half member 114, as in the third embodiment. Furthermore, the outer peripheral surface of the drum body 18 has a first recessed rib 18a into which the first protruding rib 94a can be loosely inserted over the entire length of the drum body 18, as in the third embodiment. Other than the above, the configuration is the same as that of the second embodiment.

[0041] A method for fixing the expanding cylinder 109 to the drum body 18 thus configured will be described. First, the drum body 18 is positioned between the pair of half members 113, 114, and the first convex rib 94a protruding from the left half member 114 is loosely inserted into the first concave rib 18a of the drum body 18 (FIG. 11(b)). Next, the locking piece 23d of the right half member 113 is locked to the locked portion 24e of the left half member 114 (FIG. 11(c)), and the inner peripheral surfaces of the pair of half members 113, 114 are attached to the outer peripheral surface of the drum body 18 with a double-sided adhesive tape 27 (fixing member). As a result, the pair of half members 113, 114 are combined, and the expanding cylinder 109 is fixed to the drum body 18. As a result, even if the dimensional tolerance (dimensional allowance) of the outer diameter of the drum body 18 and the inner diameter of the diameter expansion cylinder 109 is relatively large, the pair of half members 113, 114 can be combined to fix the diameter expansion cylinder 109 to the drum body 18. Furthermore, by accommodating the protrusion 94a in the recess 18a of the drum body 18, the relative rotation of the diameter expansion cylinder 109 with respect to the drum body 18 is prevented, and the pair of half members 113, 114 are positioned in the circumferential direction of the drum body 18, and the inner peripheral surfaces of the pair of half members 113, 114 are attached to the outer peripheral surface of the drum body 18 with the double-sided adhesive tape 27, thereby preventing the diameter expansion cylinder 109 from shifting in the longitudinal direction of the drum body 18. Furthermore, since the pair of half members 113, 114 are integrally molded while being connected by the integral hinge 115, the number of parts can be reduced. The operation of the roller blind thus configured is substantially the same as that of the first embodiment, and therefore a repeated explanation will be omitted.

[0042] <Fifth embodiment> 12 and 13 show a fifth embodiment of the present invention. In FIG. 12 and FIG. 13, the same reference numerals as in FIG. 11 indicate the same parts. In this embodiment, a fixing member 137 for fixing the inner peripheral surface of a pair of half members 133, 134 to the outer peripheral surface of a drum body 138 has a second concave streak 137a having a generally mushroom-shaped cross section, which is provided along the entire length of the inner peripheral surface of the left half member 134 of the pair of half members 133, 134, and a second convex streak 137b having a generally mushroom-shaped cross section, which is provided on the outer peripheral surface of the drum body 138 and into which the second concave streak 137a can be fitted. The second concave streak 137a is provided so as to protrude from the inner peripheral surface of the upper curved abutment surface 24c among the three curved abutment surfaces 24c of the left half member 134. The second convex streak 137b is formed on the upper surface of the drum body 138. Further, the chain portion 63a of the third fastener 63 attached to the mounting end of the screen body 16 to the winding drum is inserted into the recessed groove 74a formed in the left half member 134 of the pair of half members 133, 134, and the screen body 16 is attached to the diameter expansion cylinder 129. That is, since the screen body 16 is attached to the left half member 134 fixed to the drum body 138 via the fixing member 137, when the screen body 16 is fully unwound, the weight of the screen body 16 is applied to the left half member 134 fixed to the drum body 138 via the fixing member 137, so that the diameter expansion cylinder 129 is less likely to come off the drum body 138 compared to the case where the screen body is attached to the right half member 133 not fixed to the drum body 138. Other than the above, the configuration is the same as that of the fourth embodiment.

[0043] A method of fixing the expanding cylinder 129 to the drum body 138 thus configured will be described. First, the drum body 138 is positioned between the pair of half members 133, 134, and the second concave streak 137a protruding from the inner circumferential surface of the upper curved abutment surface 24c of the left half member 134 is fitted into the second convex streak 137b formed on the upper surface of the drum body 138 (FIGS. 12(b) and 13(a)). At this time, the second concave streak 137a is elastically deformed, so that the second concave streak 137a is fitted into the second convex streak 137b. Next, the locking piece 23d of the right half member 133 is locked into the locked portion 24e of the left half member 134 (FIG. 13(b)). As a result, the pair of half members 133, 134 are combined, and the expanding cylinder 129 is fixed to the drum body 138. As a result, even if the dimensional tolerance (dimensional allowance) of the outer diameter of the drum body 138 and the inner diameter of the expanding cylinder 129 is relatively large, the pair of half members 133, 134 can be combined to fix the expanding cylinder 129 to the drum body 138. In addition, by fitting the second concave rib 137a of the left half member 134 to the second convex rib 137b of the drum body 138, the pair of half members 133, 134 can be reliably prevented from rotating relative to the drum body 138, and the expanding cylinder 129 can be prevented from falling off the drum body 138. Furthermore, since the pair of half members 133, 134 are integrally molded in a state where they are connected by the integral hinge 115, the number of parts can be reduced. The operation of the roller screen configured in this manner is substantially the same as that of the first embodiment, so repeated explanation will be omitted.

[0044] Sixth embodiment FIG. 14 shows a sixth embodiment of the present invention. In FIG. 14, the same reference numerals as those in FIG. 13(b) indicate the same parts. In this embodiment, a fixing member 157 for fixing the inner peripheral surface of a pair of half members 153, 154 to the outer peripheral surface of a drum body 158 has a second concave streak 157a having a generally mushroom-shaped cross section, which is provided along the entire length of the inner peripheral surface of the left half member 154 of the pair of half members 153, 154, and a second convex streak 157b having a generally mushroom-shaped cross section, which is provided on the outer peripheral surface of the drum body 158 and into which the second concave streak 157a can be fitted. The second concave streak 157a protrudes from the inner peripheral surface of the central curved abutment surface 24c of the three curved abutment surfaces 24c of the left half member 154. The second convex streak 157b is formed on the left side surface of the drum body 158. Other than the above, the fifth embodiment is configured in the same manner as the fifth embodiment.

[0045] The method of fixing the expanding cylinder 149 to the drum body 158 thus configured is substantially the same as the method of fixing the expanding cylinder to the drum body of the fifth embodiment, except that the drum body 158 is positioned between the pair of half members 153, 154, and the second concave rib 157a protruding from the inner circumferential surface of the central curved abutment surface 24c of the curved abutment surface 24c of the left half member 154 is fitted into the second convex rib 157b formed on the side surface of the drum body 158. Therefore, repeated explanation will be omitted. Moreover, the operation of the roller screen thus configured is substantially the same as that of the first embodiment, so repeated explanation will be omitted.

[0046] <Seventh embodiment> FIG. 15 shows a seventh embodiment of the present invention. In FIG. 15, the same reference numerals as in FIG. 1 indicate the same parts. In this embodiment, a pair of fixing members 177, 177 for fixing the inner peripheral surfaces of the pair of half members 173, 174 to the outer peripheral surface of the drum main body 178 includes a pair of second concave ribs 177a, 177a having a generally mushroom-shaped cross section and extending over the entire length of both the inner peripheral surfaces of the pair of half members 173, 174, and a pair of second convex ribs 177b, 177b having a generally mushroom-shaped cross section and provided on the outer peripheral surface of the drum main body 178 and capable of being fitted into the pair of second concave ribs 177a, 177a. The pair of second concave ribs 177a, 177a are respectively provided on the inner peripheral surfaces of the central curved abutment surfaces 23c, 24c of the pair of half members 133, 134. The pair of second protruding strips 177b, 177b are formed on the right and left sides, respectively, of the drum main body 178. Other than the above, the configuration is the same as that of the second embodiment.

[0047] A method for fixing the expanding diameter cylinder 169 to the drum main body 178 configured in this manner will be described. With the drum main body 178 positioned between the pair of half members 173, 174, the pair of half members 173, 174 are combined to fix the expanding diameter cylinder 169 to the drum main body 178. Specifically, first, the right half member 173 of the pair of half members 173, 174 is turned upside down and left-right to position the drum main body 178 between the pair of half members 173, 174 (FIG. 15(c)). Next, the locking piece 23d of the right-side half member 173 is engaged with the locked portion 24e of the left-side half member 174, and the locking piece 24d of the left-side half member 174 is engaged with the locked portion 23e of the right-side half member 173, and the second concave rib 177a protruding from the inner surface of the central curved abutment surface 23c of the curved abutment surfaces 23c of the right-side half member 173 is fitted into the second convex rib 177b formed on the right side of the drum body 178, and the second concave rib 177a protruding from the inner surface of the central curved abutment surface 24c of the curved abutment surfaces 24c of the left-side half member 174 is fitted into the second convex rib 177b formed on the left side of the drum body 178 (Figure 15(d)). Thereby, the pair of half members 173, 174 are combined, and the diameter expansion cylinder 169 is fixed to the drum main body 178. As a result, even if the dimensional tolerance (dimensional allowance) of the outer diameter of the drum main body 178 and the inner diameter of the diameter expansion cylinder 179 is relatively large, the pair of half members 173, 174 can be combined, and the diameter expansion cylinder 169 can be fixed to the drum main body 178. In addition, since the diameter expansion cylinder 169 can be assembled using the pair of half members 173, 174 having the same shape, the number of types of parts can be reduced, and parts management can be easily performed. Furthermore, by fitting the second concave rib 177a of the right-side half member 173 into the second convex rib 177b on the right side of the drum body 178 and fitting the second concave rib 177a of the left-side half member 174 into the second convex rib 177b on the left side of the drum body 178, it is possible to reliably prevent relative rotation of the pair of half members 173, 174 with respect to the drum body 178 and to prevent the expansion cylinder 169 from falling off from the drum body 178.

[0048] The procedure for mounting the screen body of the roller screen thus configured to the winding drum is substantially the same as that of the second embodiment, and therefore the repeated explanation will be omitted. Also, the operation of the roller screen thus configured is substantially the same as that of the first embodiment, and therefore the repeated explanation will be omitted.

[0049] In the second and fourth to seventh embodiments, the groove into which the chain part of the third fastener is inserted is formed in each of the pair of half members, but the groove into which the chain part of the third fastener is inserted may be formed in one of the pair of half members. Also, a relatively shallow recess for accommodating the relatively thick tape part of the third fastener whose chain part is inserted in the groove may be formed in the outer circumferential surface of one of the half members. Also, in the fourth to seventh embodiments, the third fastener is attached to the attachment end of the screen body to the winding drum and the third fastener is inserted into the groove, thereby attaching the screen body to the expanding cylinder, but the screen body may be attached to the expanding cylinder by attaching the attachment end of the screen body to the winding drum to the outer circumferential surface of the expanding cylinder of the winding drum with double-sided adhesive tape.

[0050] In addition, in the third and fourth embodiments, a first convex strip is protruded from the inner surface of the left half member facing radially inward of the expansion cylinder and over the entire length of the left half member, and a first concave strip into which the first convex strip can be loosely inserted is formed on the outer surface of the drum body over the entire length of the drum body. However, a first convex strip may be protruded from the inner surface of the right half member facing radially inward of the expansion cylinder and over the entire length of the right half member, and a first concave strip into which the first convex strip can be loosely inserted is formed on the outer surface of the drum body over the entire length of the drum body. Alternatively, a first concave strip may be protruded from the inner surface of one of the pair of half members facing radially outward of the expansion cylinder and over the entire length of that half member, and a first convex strip into which the first concave strip can be loosely inserted is formed on the outer surface of the drum body over the entire length of the drum body.

[0051] In addition, in the above fifth and sixth embodiments, the fixing member has a second concave groove having a generally mushroom-shaped cross section extending along the entire length of the inner peripheral surface of the left half member of the pair of half members, and a second convex groove having a generally mushroom-shaped cross section provided on the outer peripheral surface of the drum body into which the second concave groove can be fitted. However, the fixing member may have a second concave groove having a generally mushroom-shaped cross section extending along the entire length of the inner peripheral surface of the right half member of the pair of half members, and a second convex groove provided on the outer peripheral surface of the drum body into which the second concave groove can be fitted. Alternatively, the fixing member may have a second convex groove having a generally mushroom-shaped cross section extending along the entire length of the inner peripheral surface of one of the pair of half members (left or right), and a second concave groove provided on the outer peripheral surface of the drum body into which the second convex groove can be inserted.

[0052] Furthermore, in the seventh embodiment, the fixing member has a pair of second concave ribs having a generally mushroom-shaped cross section extending along the entire length of the inner surfaces of both of the pair of half members, and a pair of second convex ribs having a generally mushroom-shaped cross section provided on the outer surface of the drum body into which the pair of second concave ribs can be fitted. However, the fixing member may have a pair of second convex ribs having a generally mushroom-shaped cross section extending along the entire length of the inner surfaces of both of the pair of half members, and a pair of second concave ribs provided on the outer surface of the drum body into which the pair of second convex ribs can be inserted. Alternatively, the fixing member may have a second concave rib or second convex rib having a generally mushroom-shaped cross section extending along the entire length of the inner surface of one of the pair of half members, and a second convex rib or second concave rib provided on the outer surface of the drum body into which the second concave rib or second convex rib can be fitted or inserted. [Explanation of symbols]

[0053] 10 Roller Blinds 11 Window Frame 12 Head Box 13 Winding drum 14 Bottom Bar 16 Screen body 18,138,158,178 Drum body 18a 1st groove 19,69,89,109,129,149,169 Expanded diameter cylinder 21 First fastener 22 Second fastener 23,24,73,74,93,94,113,114,133,134,153,154,173,174 Half-split members 23d,24d Locking piece 23e,24e Locked part 27 Double-sided adhesive tape (fixing material) 31 First guide frame 32 Second guide frame 63 Third fastener 73a,74a Concave groove 94a First convex strip 115 Integral Hinge 137,157,177 Fixing member 137a,157a,177a 2nd groove 137b,157b,177b 2nd protrusion

Claims

1. A roll screen comprising: a winding drum rotatably mounted in a head box provided along the upper edge of a window frame; a screen body that is reeled out and wound around the winding drum and has a bottom bar attached to its lower end; first and second fasteners respectively attached to both side edges of the screen body; and first and second guide frames provided along both side edges of the window frame to guide the first and second fasteners. The winding drum has a drum body rotatably mounted in the head box, and an expanding cylinder fixed to the outer circumferential surface of the drum body so that both ends of the drum body are exposed and expanding the diameter of the drum body, The expanding cylinder is composed of a pair of half-split members split in half along a plane including a center line of the expanding cylinder, With the drum body positioned between the pair of half members, the pair of half members are joined together, and the expanding cylinder is fixed to the drum body, When the screen main body is wound around the winding drum, the first and second fasteners do not come into contact with the expanding cylinder, and only the screen main body is wound in contact with the expanding cylinder, A roll screen, characterized in that the entire outer peripheral surface of the drum body is covered by the expanding cylindrical body.

2. 2. A roll screen according to claim 1, wherein the length of said expanding cylinder is smaller than the width of the screen body excluding the first and second fasteners attached to both side edges of said screen body.

3. The pair of half members are formed to have the same shape and size, A locking piece and a locked portion are respectively provided on opposing surfaces of the pair of half members over the entire length of the pair of half members, A roller screen as described in claim 1 or 2, in which one of the pair of half-members is inverted upside down and left to right to position the drum body between the pair of half-members, and the locking piece of the one half-member is engaged with the locking portion of the other half-member and the locking piece of the other half-member is engaged with the locking portion of the one half-member, and the inner surfaces of the pair of half-members are fixed to the outer peripheral surface of the drum body with a fixing member, thereby combining the pair of half-members and fixing the expansion cylinder to the drum body.

4. The pair of half members are integrally molded in a state where they are connected to each other by an integral hinge, A locking piece is provided on one of the pair of half members, The other half of the split member has a protruding engaged portion with which the engaging piece can be engaged, A roller screen as described in claim 1 or 2, wherein with the drum body positioned between the pair of half members, the locking piece is locked to the locked portion, and the inner surface of one of the pair of half members is fixed to the outer surface of the drum body with a fixing member, thereby combining the pair of half members and fixing the expansion cylinder to the drum body.

5. 5. The roller screen according to claim 3, wherein the fixing member is a double-sided adhesive tape for attaching the inner peripheral surfaces of the pair of half members to the outer peripheral surface of the drum body.

6. A first convex rib or a first concave rib is provided on an inner peripheral surface of one of the pair of half members, the first convex rib or the first concave rib is provided facing inward or outward in the radial direction of the expanding cylinder and extending over the entire length of the one half member, 6. A roller screen according to claim 5, wherein a first concave rib or a first protruding rib is formed on the outer peripheral surface of said drum body over the entire length of said drum body, into which said first protruding rib or said first concave rib can be loosely inserted or fitted.

7. A roller screen as described in claim 3 or 4, wherein the fixing member has a second concave or convex rib having an approximately mushroom-shaped cross section extending along the entire length of the inner peripheral surface of either or both of the pair of half members, and a second convex or convex rib having an approximately mushroom-shaped cross section provided on the outer peripheral surface of the drum body, into which the second concave or convex rib can be fitted or inserted.

8. A groove extending in the longitudinal direction is formed along the entire length of an outer peripheral surface of one or both of the pair of half members, A third fastener is attached to an end portion of the screen body that is attached to the winding drum, 8. The roller screen according to claim 1, wherein the screen body is attached to the expanding cylinder by inserting the third fastener into the recessed groove.

Images