Sheet type shutter unit

Abstract

To efficiently install an end part sheet material 10 that is to be open-close guided with a guide rail 3, while thermal insulation performance of a sheet type shutter curtain 2, which opens and closes an opening of an entrance and the like of a building, being maintained.SOLUTION: In the case an end part sheet material 10 is installed by heat-fusion to a shutter curtain 2 that has first and second thermal-insulation space parts X and Y formed by heat-fusing first, second and third sheet materials 7, 8 and 9, the end part sheet material 10, as a fifth connection part 25, is heat-fused overlapping a third connection part 23 that has been heat-fused to seal both the left and right end parts of the first and second thermal-insulation space parts X and Y.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to the technical field of a sheet-type shutter device that can be installed in an opening such as an entrance or exit of a building so as to be able to be opened and closed freely. [Background technology]

[0002] Generally, among the shutter devices installed to open and close openings such as entrances and exits of buildings, there is known a type in which the shutter curtain is made of a sheet and wound around a winding body (winding drum, winding wheel) installed in the ceiling (above the opening) in order to speed up the opening and closing operation of the shutter curtain. In such sheet-type shutter devices, the shutter curtain is made of a single sheet material, which impairs the insulation (heat retention) properties and reduces the air conditioning effect. Therefore, it has been proposed to connect a pair of sheet materials, front and back, at an interval above and below, to create a shutter curtain in which multiple cylindrically shaped insulating spaces are arranged in a continuous manner in the vertical direction via the connecting parts (see, for example, Patent Document 1). Incidentally, shutter curtains need to be guided when opening and closing with both left and right edge portions fitted into guide rails, but the shutter curtain in Patent Document 1 has a structure in which the thick shutter curtain made by forming an insulating space is fitted directly into the guide rail. Therefore, if the shutter curtain is of a sheet type, the shutter curtain is flexible and easily deformed, and so even a slight deformation can easily cause the shutter curtain to slip out of the guide rail. In response to this, it has been proposed to provide end sheet materials at both left and right edge portions of the shutter curtain, designed to prevent the curtain from easily slipping out of the guide rails (see Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-31583 A [Patent Document 2] JP 2014-84617 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional end sheet material is provided by connecting an end sheet material to the left and right edge portions of a single sheet-like shutter curtain, and there is no specific suggestion as to a structure for connecting an end sheet material to a thick shutter curtain having an insulating space formed therein, as in Patent Document 1.As a result, when this technology is adopted, there is a problem that it is not possible to easily and reliably provide a way to connect an end sheet material to a thick shutter curtain having an insulating space formed therein without impairing the insulating properties, and these are the problems that the present invention aims to solve. [Means for solving the problem]

[0005] The present invention was created in consideration of the above-mentioned actual situation and with the aim of solving these problems. The invention of claim 1 is a sheet-type shutter device comprising a sheet-type shutter curtain installed to open and close an opening such as an entrance and exit of a building, a guide rail installed in the opening to guide the opening and closing of the left and right end edges of the shutter curtain, and a winding body arranged above the opening and around which the shutter curtain is wound, wherein the shutter curtain is connected by connecting first and second sheet materials at an appropriate interval, so that a first insulation space is formed continuously above and below, sandwiching a first connecting portion, and end sheet materials that are guided to open and close by the guide rails are attached to both left and right end edges, and the first connecting portion is formed and the end sheet materials are attached by heat fusion, wherein the left and right end edges of the first insulation space are sealed by heat fusion, and the end sheet materials are attached by heat fusion to the heat fusion sites for sealing the left and right end edges of the first insulation space. The invention of claim 2 is a sheet-type shutter device as described in claim 1, characterized in that the shutter curtain is formed by connecting a third sheet material to the second sheet material of the upper and lower first insulation space portions on either side of the first connecting portion by heat fusion, straddling the first connecting portion, so that the second insulation space portion is formed between the upper and lower second connecting portions straddling the first connecting portion, and the left and right end edges of the first and second insulation spaces are sealed by heat fusion, and the end sheet material is attached by heat fusion to the heat fusion portions that seal the left and right end edges of the first and second insulation spaces. The invention of claim 3 is a sheet-type shutter device as described in claim 2, characterized in that the second sheet material has an upper edge connected to the take-up body, and a bottom portion in which a weight is accommodated is formed at its lower edge, and the bottom portion is formed by connecting the upper end of an extended lower piece portion extended to a portion corresponding to the bottom portion of the second sheet material and the upper end of a folded piece portion formed by folding back an extension from the extended lower piece portion by thermal fusion, and the end sheet material is attached to both left and right edge portions of the bottom portion by thermal fusion with its lower edge reaching the bottom portion, and a cut-out portion is formed in the left and right edge portion of either the extended lower piece portion or the folded piece portion, so that when the end sheet material is attached to the bottom portion by thermal fusion, both left and right edge portions of the bottom portion are not sealed but are open. The invention of claim 4 is a sheet-type shutter device as described in claim 3, characterized in that the bottom portion is covered by a bottom sheet material with its lower edge folded over, and the bottom sheet material is attached by heat-sealing the upper edge portions of the front and rear sheet pieces formed by the folding over to the heat-sealing portions for forming the bottom portion, and the left and right edge portions of the heat-sealed portions of the front and rear sheet pieces are heat-sealed in a state where they overlap the upper edge portions of the cutout portions. Effect of the Invention

[0006] By adopting the invention of claim 1, a sheet-type shutter curtain can be made highly insulating by forming a first insulating space by connecting first and second sheet materials by heat fusion. When end sheet materials which are inserted into guide rails and guided for opening and closing are provided at both left and right edge portions of the shutter curtain, the shutter curtain maintains high insulating properties by sealing both left and right edge portions of the first insulating space by heat fusion. As a result, the end sheet materials can be attached to the portions where the left and right edge portions are heat fused by heat fusion, so that the end sheet materials can be attached by effectively utilizing the heat fused portions of the left and right edge portions. This enables the end sheet materials to be attached in a compact and simple manner while maintaining the high insulating performance of the shutter curtain. By making use of the invention of claim 2, the shutter curtain is formed by heat-sealing the first, second and third sheet materials to form first and second insulating spaces, and by sealing the left and right end edges of the first and second insulating spaces by heat-sealing, it is possible to exhibit even higher insulating performance, while the end sheet materials are connected to the heat-sealed portions by heat-sealing, so that the end sheet materials can be attached by effectively utilizing the heat-sealed portions for sealing the first and second insulating spaces, thereby enabling the end sheet materials to be attached in a compact and simple manner while maintaining the shutter curtain's higher insulating performance. By adopting the invention of claim 3, a bottom portion is formed at the lower edge of the second sheet material which functions as the curtain core of the shutter curtain. In this case, the bottom portion is formed by folding back the lower end of the second sheet material and heat fusing it. In this case, the heat-sealed portions of both left and right end edges of either the extended lower piece or the folded-back piece which form the bottom portion are cut out. As a result, when the end sheet material is attached to the bottom portion by heat fusing, both left and right end edges of the bottom portion are not sealed but are open, making it possible to insert and remove the weight required for a sheet-type shutter curtain even later, without impairing maintainability. By adopting the invention of claim 4, when the bottom portion is further covered with a bottom sheet material, the bottom sheet material is also attached by connection through heat welding. In this case, the upper edge portions of the front and rear sheet pieces of the bottom sheet material are heat sealed, and the left and right edge portions of the heat-sealed portions of the front and rear sheet pieces are heat sealed in a state where they overlap the upper edge portions of the cutout portions formed in either the extended lower piece or the folded-back piece that form the bottom portion. As a result, the heat sealing is performed in a state where the number of sheet layers to be heat-sealed at that portion is reduced by one layer, thereby ensuring reliable heat sealing. [Brief description of the drawings]

[0007] [Figure 1] FIG. [Diagram 2] FIG. 2 is a vertical sectional side view of the shutter device. [Diagram 3] FIG. [Figure 4] 13(A) and 13(B) are longitudinal cross-sectional views of the upper and lower ends of a shutter curtain. [Diagram 5] 1A and 1B are enlarged front views of the main parts of the left and right edge portions of the shutter curtain, and cross-sectional plan views of the guide rail portion. [Figure 6] 1A and 1B are a perspective view and a side view showing an outline of a thermal fusion device. [Figure 7] 1(A) and 1(B) are schematic side views showing the first and second fusion steps. [Figure 8] 1A, 1B, and 1C are front views of the essential parts of the shutter curtain with the insulating space sealed, front views of the essential parts with the end sheet material attached, and longitudinal plan views of the essential parts with the end sheet material attached. [Figure 9] 5(A) to 5(C) are schematic perspective views of the main part, illustrating a procedure for forming the bottom portion. [Figure 10] 13A and 13B are schematic perspective views of essential parts showing a procedure for connecting an end sheet material to a bottom portion. [Figure 11]13(A) and 13(B) are schematic perspective views of essential parts showing a procedure for connecting bottom sheet materials. [Figure 12] 1A, 1B, and 1C are a front view, a cross-sectional side view along line BB, and a cross-sectional side view along line CC of the window portion of the shutter curtain. [Figure 13] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a sheet-type shutter device that is installed to separate an opening E, such as an entrance or exit of a building, such as a building or a factory, into front and rear (indoor and outdoor), and the shutter device 1 is of a general-purpose structure that is configured using various member devices, such as a sheet-type shutter curtain 2 (described later), guide rails 3 that are provided on the left and right sides of the opening E to guide the shutter curtain 2 in opening and closing up and down, a take-up body (take-up drum, take-up wheel) 5 that is disposed in a shutter case 4 provided above the opening E and on which the shutter curtain 2 is wound in a spiral shape, and an electric opening / closing device 6 that is provided to rotate the take-up body 5 forward and backward, all of which are conventional.

[0009] The shutter curtain 2 has its upper edge connected to a roll-up body 5 so as to separate the opening E into front and rear (indoors and outdoors) when in a closed (fully closed) position, and is composed of a first sheet material 7 which is long in the vertical direction, a second sheet material 8 which is long in the vertical direction and arranged opposite the first sheet material 7, a third sheet material 9 which is arranged opposite the second sheet material 8, and end sheet materials 10 which are connected to both the left and right end edges of these sheet materials 7, 8, 9 and are inserted into the guide rails 3 to be guided for opening and closing, and furthermore, a bottom portion (seat portion) 11 is formed at the lower edge of the shutter curtain 2 into which a weight 11a is enclosed to assist the closing operation of the shutter curtain 2.

[0010] Incidentally, in this embodiment, a brief explanation will be given of the structure in which the end sheet material 10 provided on both the left and right end edges of the shutter curtain 2 is guided for opening and closing by the guide rail 3, but this configuration already employs publicly known technology. First, the guide rail 3 is formed in a C-shaped guide groove and is made of a flexible material. The guide rail 3 thus formed is provided on a rail body 3a provided on the body side member Z so as to be movable in the left-right direction while being biased outward in the left-right direction via a resilient device 3b. The left-right outer piece of the end sheet material 10 is inserted into the guide rail 3, and a guide protrusion 10b is provided at the insertion portion of the end sheet material 10, and the guide protrusion 10b fits into the guide rail 3 having a guide groove shape, thereby preventing the end sheet material 10 from easily slipping out. In this state, if a person or luggage hits the shutter curtain 2 in the closed position, the contact load will cause the guide rail 3 to move in the direction of coming out of the rail main body 3a (inward in the left-right direction) against the biasing force of the elastic mechanism 3b, thereby reducing the contact load.However, if the contact load is large, the guide rail 3 that has come out of the rail main body 3a against the biasing force of the elastic mechanism 3b will expand, and the guide protrusion 10b will come out of the guide rail 3, causing the shutter curtain 2 to come out of the guide rail 3, thereby preventing damage to the shutter curtain 2 and the abutting object. Incidentally, the guide projections 10b are attached to reinforcing portions 10c which are formed by folding back the left and right edge portions of the end sheet material 10 to form a double layer and then further reinforcing the double layer by heat sealing.

[0011] Next, the structure of the shutter curtain 2 will be specifically described. In the shutter curtain 2, the first and second sheet materials 7, 8 are connected vertically at an appropriate interval to each other, so that a first insulating space X having a cylindrical shape with both left and right ends open is formed continuously from top to bottom with a first connecting portion 21 sandwiched therebetween. A third sheet material 9 is attached to the second sheet materials 8 at the upper and lower first insulating space X parts sandwiching the first connecting portion 21 and connected to form a second connecting portion 22, so that a second insulating space Y having a cylindrical shape with both left and right ends open is formed continuously from top to bottom with a state of straddling the first connecting portion 21. Then, the first and second insulating materials 12, 13 are inserted and assembled in the first and second insulating spaces X, Y in a loose fit state. When the shutter curtain 2, in which the first and second insulating materials 12, 13 are incorporated in the first and second insulating space portions X, Y, is in a tensed closed (hanging) position under the weight of the bottom portion 11, the second insulating material 13 is arranged so that it overlaps (stacks) from the front to the back at the first connecting portion 21. In this state, the upper and lower edge portions of the first and second insulating materials 12, 13 overlap from the front to the back, and the shutter curtain 2 is configured so that the first and second insulating materials 12, 13 are arranged alternately from the front to the back, but are continuous with no gaps above and below, thereby allowing the shutter curtain 2 to exhibit high insulating performance. In this case, the shutter curtain 2 is configured such that the upper edge of the second sheet material 8, which is sandwiched between the first and third sheet materials 7 and 9, is connected to the roll-up body 5, and a bottom portion 11 is formed in a folded-over shape at the lower end, i.e., the second sheet material 8 is configured as a core material that serves as the curtain core of the shutter curtain 2.

[0012] The procedure for manufacturing such a shutter curtain 2 will be described below. In this case, the first, second and third sheet materials 7, 8, 9, the end sheet material 10 and the bottom sheet material 16 described later all have heat fusion properties, and all of these are connected by heat fusion, which is easier to work with than when sewing or bonding is used as the connecting means. Specifically, these sheet materials 7, 8, 9, 10, and 16 are all made of a heat-resistant resin material, for example a sheet material (woven fabric, nonwoven fabric) formed by braiding polyester resin fibers as a core material, and a flexible cloth material (drawing cloth) formed by bonding (integrating) a resin material having heat fusion properties, for example a polyvinyl chloride resin material, to the surface of the core material in a molten state.

[0013] For example, a well-known high-frequency dielectric type heat-sealing device 14 is used for heat-sealing such sheet materials 7, 8, 9, 10, 16. The heat-sealing device 14 will be briefly described with reference to FIG. 6. For example, in the case of a device in which the first and second sheet materials 7, 8 are heat-sealed first as in a second embodiment described later, the device is provided with a flat electrode substrate 14a serving as a negative pole and a rod-shaped electrode body 14b serving as a positive pole. With the first and second sheet materials 7, 8 overlapped, the second sheet material 8 is set on the substrate 14a so that it abuts against the electrode substrate 14a. At the same time, with the electrode body 14b set so as to be pressed against the first sheet material 7, a high-frequency current is applied between the two electrodes, causing the first and second sheet materials 7, 8 to heat up and melt (dissolve) at the portions thereof that are in contact with the electrode body 14b, thereby bonding (connecting) them together; this fusion (welding) forms a first connecting portion 21, and the first and second sheet materials 7, 8 are connected together as an integrated unit; the heat fusion process described below is carried out using such a heat fusion device 14.

[0014] The shutter curtain 2 is manufactured by first appropriately heat-sealing the first, second and third sheet materials 7, 8 and 9 to form the first and second connecting portions 21 and 22, thereby forming the first and second insulating space portions X and Y. The manufacturing method thereof will now be described. In this case, in this embodiment, as shown in Figure 7, the first heat sealing process is performed in which the second and third sheet materials 8, 9 are heat sealed to form a second connecting portion 22 to form a second insulating space portion Y, and then the second heat sealing process is performed in which the first and second sheet materials 7, 8 are heat sealed to form a first connecting portion 21 to form a first insulating space portion X.

[0015] In this case, the second sheet material 8 is configured as a single piece with its upper end connected to the roll 5 and its lower end set to a length that folds back to form the bottom portion 11, whereas the first sheet material 7 is configured as a single piece set to a length that forms the space between the upper and lowermost first connecting portions 21, but the third sheet material 9 is configured as a plurality of single pieces set to a length (vertical width) between the upper and lower second connecting portions 22 to form each second insulation space portion Y. For this reason, the connection of the third sheet material 9 to the second sheet material 8 by thermal fusion results in the third sheet material 9 being connected above and below the second sheet material 8 in one first insulation space portion X portion, resulting in a connection structure in which the second connecting portions 22 are formed in two places, above and below. Incidentally, the third sheet material 9 can also be configured as a single piece set to a length that forms the space between the second connecting portions 22 at the upper and lower ends, similar to the first sheet material 7. In this case, the third sheet material 9 can be connected to the second sheet material 8 at one first insulation space portion X with a single connecting structure.

[0016] In this case, a first heat sealing step is performed in which a third sheet material 9 is applied to a portion of the second sheet material 8 corresponding to the second insulating space Y, and the second and third sheet materials 8, 9 are heat-sealed together to form a second connecting portion 22, thereby forming a cylindrical second insulating space Y that is open on both sides. Next, a second heat sealing step is performed in which a first sheet material 7 is applied to the surface of the second sheet material 8 opposite to the surface to which the third sheet material 9 is connected, and the first and second sheet materials 7, 8 are heat-sealed together to form a first connecting portion 21, thereby forming a cylindrical first insulating space X that is open on both sides.

[0017] In this case, in the second heat-sealing step, if the first, second and third sheet materials 7, 8 and 9 are laminated and heat-sealed in this state, not only will the first and second sheet materials 7 and 8 to be heat-sealed be heat-sealed, but the third sheet material 9 will also be heat-sealed to the second sheet material. To avoid this, a sheet-like non-heat-sealing material 15 is attached in advance to the surface of the third sheet material 9 facing the second sheet material 8, corresponding to the location of the first connecting portion 21, via a fastening material such as a double-sided adhesive sheet, at a stage before the first heat-sealing step is performed, and the third sheet material 9 with the non-heat-sealing material 15 provided is used. The non-thermal adhesive material 15 is made of a material having excellent heat resistance, such as silicone resin or fluororesin, to which the thermal adhesive resin used in each of the sheet materials 7, 8, and 9 will not thermally fuse.

[0018] Then, after the first heat-sealing step is performed using the third sheet material 9 provided with the non-thermal adhesive material 15 in this manner, a second heat-sealing step is performed in which the second sheet material 8 and the first sheet material 7 are heat-sealed to form the first connecting portion 21. When this second heat-sealing step is performed, the first, second and third sheet materials 7, 8 and 9 are laminated at the first connecting portion 21 by the heat-sealing device 14, and a high-frequency current is applied to perform heat fusion, but as described above, the non-thermal adhesive material 15 is fixed to the third sheet material 9. As a result, the non-thermal adhesive material 15 is sandwiched between the second and third sheet materials 8 and 9, and in the second heat-sealing step, the first and second sheet materials 7 and 8 are heat-sealed to each other to form the first connecting portion 21, while the third sheet material 9 and the second sheet material 8 are not heat-sealed to each other, and the cavity of the second insulating space portion Y is maintained.

[0019] After the second heat sealing process is carried out, the non-heat-sealing material 15 can be peeled off and removed from the third sheet material 9, thereby making the second insulating space Y free of the non-heat-sealing material 15. However, if the non-heat-sealing material 15 is thin and will not cause any problems if it remains when the shutter curtain 2 is made, it is not necessarily necessary to remove it. Incidentally, in this case, the non-thermal adhesive material 15 is provided on the third sheet material 9 because the third sheet material 9 and the second sheet material 8 are not thermally fused in the second heat sealing process, but it is of course also possible to implement the process in which the non-thermal adhesive material 15 is provided on the second sheet material 8 side rather than the third sheet material 9.

[0020] Furthermore, as described above, a bottom portion 11 is formed at the lowest end of the shutter curtain 2. As shown in FIG. 9, the bottom portion 11 comprises an extended lower piece 8a extending downward from the first insulation space portion X at the lowest end of the second sheet material 8, and a folded piece 8b extending further from the extended lower piece 8a and folded back toward the first sheet 7. A fourth connecting portion 24 is formed by heat-sealing the tip (upper end) of the folded piece 8b to the upper end of the extended lower piece 8a, so that the upper end of the folded piece 8b is formed into a tubular shape connected by the fourth connecting portion 24. Since the fourth connecting portion 24 is formed on the first sheet material 7 side, it is preferable from the standpoint of workability to perform the formation of this bottom portion 11 either before or after the second heat-sealing process in which the first and second sheet materials 7, 8 are heat-sealed.

[0021] After the first and second insulating materials 12, 13 are inserted and assembled into the hollow first and second insulating spaces X, Y constructed in this manner, the left and right end edges of the first and second insulating spaces X, Y are sealed via the third connecting portions 23 formed by the third heat sealing process, thereby making the first and second insulating spaces X, Y sealed and airtight with the first and second insulating materials 12, 13 inserted, thereby improving the insulation properties (see Figure 8). In this case, both left and right edge portions of the bottom portion 11 have cutout portions 8c formed by cutting out both left and right edge portions of the folded-over piece portion 8b, so that the third connecting portion 23 formed by the third heat fusion process is not formed in the bottom portion 11 (see Figure 9).As a result, both left and right edge portions of the bottom portion 11 remain open, and the weight 11a can be inserted and assembled as desired.

[0022] In this way, with the third connecting portion 23 formed for sealing both left and right edge portions of the first and second insulating space portions X, Y, as shown in Figures 8 and 10, the left and right inner portion of the end sheet material 10 is further laminated on the surface of the second sheet material 8 side of the third connecting portion 23 to form a fifth connecting portion 25 by thermal fusion, thereby connecting the end sheet material 10 to both left and right ends of the shutter curtain 2. In this case, the end sheet material 10 is long and has an end extension 10a formed that reaches the bottom portion 11, and the end extension 10a is heat-sealed to both left and right edge portions of the extended lower piece 8a that constitutes the bottom portion 11 as the fifth connecting portion 25. In this connected state, the bottom portion 11 has a cutout portion 8c formed in the folded piece 8b, so that even when connected by the fifth connecting portion 25, both left and right edge portions are not sealed and remain open. In this embodiment, the heat fusion process of the third connecting portion 23 for sealing both the left and right end edges of the first and second insulating space portions X and Y and the fifth connecting portion 25 for heat-sealing the end sheet material 10 to the third connecting portion 23 is described as being performed as separate processes, but since the heat fusion is performed at the same location, the heat fusion processes for forming the third connecting portion 23 and the fifth connecting portion 25 can also be performed simultaneously depending on the settings.

[0023] The bottom portion 11 constructed in this manner is further covered around its outer periphery by a loosely fitted bottom sheet material 16 as shown in Figure 11. The bottom end of the bottom sheet material 16 is folded back into a bag shape, and the upper edge portions 16a of the front and rear sheet pieces are laminated to the fourth connecting portion 24 and are further connected by a sixth connecting portion 26 formed by heat fusion. In this case, since the sixth connecting portion 26 is also formed in a state where it is laminated to the fourth connecting portion 24, it goes without saying that the heat fusion process for forming the fourth connecting portion 24 and the sixth connecting portion 26 may be carried out simultaneously.

[0024] Furthermore, the shutter curtain 2 of this embodiment is provided with a window portion W, allowing one to see inside and outside, and this window portion W is made by attaching a window sheet material 17 by thermal fusion, as will be described in detail below. The window sheet material 17 is made of a transparent, heat-sealable resin material, such as a sheet material made of polyvinyl chloride, and at the portion of the shutter curtain 2 where the window sheet material 17 is attached, as shown in Figure 12, the first sheet material 7 is cut at the first connecting portion 21, but the second sheet material 8 is cut in a state where a window extension piece portion 8d is present, extending vertically inward (towards the window portion W) beyond the first connecting portion 21. The seventh connecting portion 27 is formed by heat-sealing both the upper and lower end edges of the window sheet material 17 to the window extension piece 8d of the second sheet material 8. In this case, cut-out portions 17a are formed in the upper, lower, left and right corner portions of the window sheet material 17. As a result, the seventh connecting portion 27 is made into a single piece in which only the second sheet material 8 is present in the area corresponding to the cut-out portion 17a, and there is no window sheet material 17.

[0025] The shutter curtain 2 is thus formed by connecting the window sheet material 17 to the vertical middle portion. In this case, the fifth connecting portion 25 is formed at both left and right end edge portions of the window sheet material 17 by welding the end sheet material 10 to the surface of the window sheet material 17 on the second sheet material 8 side, but the fusion for forming the fifth connecting portion 25 at the window portion W portion is performed by forming a notch portion 17a at the corner portion of the window sheet material 17, so that at the outer corner portion, two sheets of the second sheet material 8 and the end sheet material 10 are fused together, and the thicknesses of the left and right fifth connecting portions 25 and the upper and lower seventh connecting portions 27, which form the four-sided frame of the window portion W, are unified to two sheets, improving the appearance of the portion that is likely to be noticed as the window portion W.

[0026] In the embodiment of the present invention configured as described above, the shutter curtain 2 is a flexible sheet type, and the shutter curtain 2 can be made highly insulating by forming the first and second insulating space portions X and Y by connecting the first, second and third sheet materials 7, 8 and 9 by thermal fusion, and the end sheet material 10 that is inserted into the guide rail 3 and guided for opening and closing is provided at both left and right edge portions of the shutter curtain 2. In this case, the end sheet material 10 has a guide protrusion 10b formed so that it does not easily come out of the guide rail 3, and the end sheet material 10 is connected to the third connecting portion 23 that is thermally fused to seal the left and right edge portions of the first and second insulating space portions X and Y, and further to the fifth connecting portion 25 by thermal fusion. As a result, the end sheet material 10 can be attached by effectively utilizing the thermal fusion parts of the left and right edge portions, and the end sheet material 10 can be attached compactly and simply while maintaining the high insulating performance of the shutter curtain 2.

[0027] The end sheet material 10 is attached to the heat-sealed third connecting portion 23 at both left and right edge portions in an overlapping state as a fifth connecting portion 25 by heat fusion. As a result, the end sheet material 10 can be attached by heat fusion by effectively utilizing the heat-sealed portions that form the third connecting portions 23 at both left and right edge portions, and the end sheet material 10 can be attached in a compact and simple manner while maintaining the high insulating performance of the shutter curtain 2. In this embodiment, the shutter curtain 2 is made of three sheet materials, namely, first, second and third sheet materials 7, 8 and 9. However, it goes without saying that the present invention can also be implemented in an embodiment in which the third sheet material 9 is not present and only the first insulation space portion X is formed using the first and second sheet materials 7 and 8.

[0028] In this case, the second sheet material 8 has its upper edge connected to the winding body 5 and its lower edge formed with a bottom portion 11 in which the weight 11a is housed, thereby functioning as the curtain core of the shutter curtain 2. In this case, the bottom portion 11 is formed by connecting the upper ends of an extended lower piece portion 8a extending to the portion corresponding to the bottom portion of the second sheet material 8 and a folded piece portion 8b formed by folding back the extension from the extended lower piece portion 8a, using a fourth connecting portion 24 that is heat-sealed to each other. In this case, the end sheet material 10 is attached by a fifth connecting portion 25 that is heat-sealed all the way to the bottom portion 11. In this case, a cutout portion 8c is formed in the left and right edge portions of the folded-back piece portion 8b. As a result, when the end sheet material 10 is attached to the bottom portion 11 by heat sealing, both left and right end edges of the bottom portion 11 are not sealed and remain open, making it possible to insert and remove the weight required for a sheet-type shutter curtain even at a later date, without impairing maintainability.

[0029] Moreover, in this product, the bottom portion 11 is covered with a bottom sheet material 16 which is further attached by a sixth connecting portion 26 formed by heat sealing. In this case, the bottom sheet material 16 is connected as the sixth connecting portion 26 by heat sealing the upper edge portions 16a of the front and rear sheet pieces. The left and right edge portions of the heat-sealed upper edge portion 16a of the front and rear bottom sheet materials 16 are heat-sealed in a state in which they overlap the upper edge portion of the cutout portion 8c formed in the folded piece portion 8b which constitutes the bottom portion 11. As a result, the sheet layer which is heat-sealed at that portion is reduced by one sheet due to the formation of the cutout portion 8c, thereby ensuring reliable heat sealing. [Industrial Applicability]

[0030] The present invention can be used as a sheet-type shutter device that can be installed at an opening such as an entrance or exit of a building so as to be freely opened and closed. [Explanation of symbols]

[0031] 1 Shutter device 2. Shutter Curtain 3 Guide rail 5 Winding body 7 First sheet material 8 Second sheet material 8a Extension lower piece 8b Folded piece 8c Cutout 9. Third sheet material 10 End sheet material 10a End extension 11 Bottom section 12 Primary insulation material 13 Secondary insulation material 15 Non-thermal adhesive material 16 Bottom sheet material 16a Top edge 21 First connection part 22 Second connection part

Claims

1. A sheet-type shutter device comprising a sheet-type shutter curtain installed to open and close an opening such as an entrance or exit of a building, guide rails installed in the opening to guide the opening and closing of the left and right edges of the shutter curtain, and a winding body arranged above the opening and around which the shutter curtain is wound, The shutter curtain, By connecting the first and second sheet materials with an appropriate gap between them, a first insulating space is formed continuously above and below the first connecting portion, The end sheet material that is guided by the guide rails is attached to both left and right edge portions, In forming the first connecting portion and attaching the end sheet material by heat fusion, The first insulation space is sealed at both left and right edge portions by thermal fusion, A sheet-type shutter device, characterized in that the end sheet material is attached by heat fusion to heat fusion sites for sealing both left and right end edges of the first insulation space portion.

2. Shutter curtains are The third sheet material is connected by thermal fusion to the second sheet material of the upper and lower first insulation space portions sandwiching the first connection portion in a state in which the third sheet material straddles the first connection portion to form a second insulation space portion, so that the second insulation space portion is formed between the upper and lower second connection portions in a state in which the second insulation space portion straddles the first connection portion, The left and right end edges of the first and second heat insulating spaces are sealed by heat fusion, 2. A sheet-type shutter device according to claim 1, characterized in that the end sheet material is attached by heat fusion to heat fusion sites that seal both left and right end edges of the first and second insulation spaces.

3. The second sheet material has an upper end edge portion connected to the winding body and a lower end edge portion formed with a bottom portion in which the weight is housed, The bottom portion is formed by connecting, by thermal fusion, an upper end of an extended lower piece portion that extends to a portion of the second sheet material corresponding to the bottom portion and an upper end of a folded-back piece portion that is formed by folding back an extension of the extended lower piece portion, The end sheet material is attached to both left and right end edges of the bottom portion by heat fusion in a state where the lower end edge reaches the bottom portion, A sheet-type shutter device as described in claim 2, characterized in that a cutout portion is formed in the left and right edge portions of either the extended lower piece or the folded-back piece, whereby when the end sheet material is attached to the bottom portion by heat fusion, both left and right end edges of the bottom portion are not sealed but are open.

4. The bottom portion is covered with a bottom sheet material having a folded lower edge, The bottom sheet material is attached by heat-sealing the upper end edge portions of the front and rear sheet pieces formed by the folding back to the heat-sealing portions for forming the bottom portion, 4. The sheet-type shutter device according to claim 3, wherein the left and right edge portions of the front and rear sheet pieces to be heat-sealed are heat-sealed in a state where they overlap the upper edge portions of the cutout portions.

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