Sheet shutter, method for changing the wind pressure resistance of a sheet shutter, method for changing a shaftless sheet shutter to a sheet shutter with a shaft, and method for using a shaftless sheet shutter and a shaftless sheet shutter as a guide rail.

Abstract

The present invention provides a sheet shutter having a guide rail that can shorten the thickness of the guide rail in the depth direction of the groove and can be constructed solely of metal, thus offering excellent versatility. [Solution] The sheet shutter 1 comprises a sheet body 2, a shaft 3 that reinforces the sheet body 2, and a pair of guide rails 6 erected on both side edges of the opening and guiding the sheet body 2 up and down. The shaft 3 has a horizontal, elongated shaft body 7 and disc-shaped rollers 8 that are detachably fixed to both ends of the shaft body 7 and inserted into a groove 60. The groove 60 has a pair of lips 61 that extend in a direction in which the opening edges approach each other, and the rollers 8 are formed with a diameter longer than the width between the pair of lips 61. When a force greater than a predetermined amount is applied from a direction opposite to the sheet body 2, the shaft body 7 of the shaft 3 bends, and the ends of the shaft body 7 detach from the rollers 8.

Description

Technical Field

[0001] The present invention relates to a sheet shutter that opens and closes an entrance / exit by raising and lowering a sheet, a method for changing the wind pressure resistance of the sheet shutter, a method for changing a shaftless sheet shutter to a shaft-equipped sheet shutter, and a method for sharing a guide rail between a shaft-equipped sheet shutter and a shaftless sheet shutter.

Background Art

[0002] Conventionally, there has been known a sheet case that is installed at an entrance / exit or partition part of a building such as a factory or a warehouse, winds up a sheet provided with a plurality of shafts that are long in the sheet width direction, and incorporates a sheet drum for feeding out the sheet, and guide rails are provided at both left and right end portions thereof at left and right inner locations, and a sheet shutter that inserts both ends of the shaft into the groove portions of the guide rails and guides the raising and lowering thereof.

[0003] And when inserting the shaft into the groove portion of the guide rail, a support tool that rotatably supports rollers provided at both ends of the shaft is attached, and the shaft is guided for raising and lowering through the support tool and the rollers, and a sheet shutter that raises and lowers the sheet has been proposed (for example, see Patent Document 1).

[0004] The sheet shutter of Patent Document 1 regulates the left and right movement of the sheet body, and in order to prevent the shaft from easily detaching when the sheet body is affected by wind, a support tool having rollers is deeply inserted into the guide rail to maintain the wind pressure resistance performance. Further, when the sheet body receives a strong pressing load in the front-rear direction due to strong wind or the like, the shaft is configured to be pulled out and detached from the guide rail by greatly deflecting the support tool while suppressing the deflection of the shaft itself.

[0005] Furthermore, a sheet shutter has been proposed in which an inner rail is provided in the groove of the guide rail, a restricting portion is provided protruding from the side wall of the inner rail, rollers formed at the left and right ends of the shaft are inserted into the inner rail, and the restricting portion restricts the movement of the rollers from the back of the groove to the front so that the restriction can be released (see Patent Document 2).

[0006] As a result, when strong winds hit the sheet body, the restricting mechanism is released, causing the rollers on the shaft to detach from the grooves, thereby deflecting the strong winds and preventing damage to the shaft. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2008-190255 [Patent Document 2] Japanese Patent Publication No. 2013-36254 [Overview of the project] [Problems that the invention aims to solve]

[0008] Incidentally, the sheet shutter described in Patent Document 1 requires the roller to be deeply inserted into the groove of the guide rail in order to prevent the shaft from easily detaching. Also, the sheet shutter described in Patent Document 2 requires an elastically deformable inner rail, for example, made of resin, to be attached to the groove of the guide rail. Therefore, in conventional sheet shutters, in order to prevent the shaft from easily detaching from the guide rail and to allow it to detach only in strong winds, it is necessary to form the groove of the guide rail deeply, or to make the groove double and provide an inner rail made of resin, which requires increasing the length of the guide rail in the depth direction of the groove, and it is difficult to form the guide rail solely from metal.

[0009] Therefore, the present invention aims to provide a sheet shutter having a guide rail that can shorten the thickness of the guide rail in the depth direction of the groove and can be made only of metal, thus offering excellent versatility; a method for changing the wind pressure resistance of a sheet shutter; a method for changing a shaftless sheet shutter to a sheet shutter with a shaft; and a method for using both a shaft-equipped sheet shutter and a shaftless sheet shutter as guide rails. [Means for solving the problem]

[0010] The first sheet shutter of the present invention is a sheet shutter that can open and close an opening in a building, comprising: a flexible sheet body; a shaft fixed horizontally across the width direction of the sheet body and reinforcing the sheet body; a winding drum provided above the opening for winding the sheet body; an opening and closing drive unit for rotating the winding drum in forward and reverse directions; and a pair of guide rails erected on both side edges of the opening, each having grooves that open toward the opposite sides, for guiding the sheet body up and down, wherein the shaft has a horizontally elongated shaft body and disc-shaped rollers detachably fixed to both ends of the shaft body and inserted into the grooves, the grooves have a pair of lips extending in a direction toward the opening edges approaching each other, and the rollers are formed with a diameter longer than the width between the pair of lips, and when a force greater than a predetermined amount is applied from a direction opposite to the sheet body, the shaft body bends and the ends of the shaft body detach from the rollers.

[0011] The second sheet shutter is characterized in that the shaft is formed so that the shaft body, when detached from the roller, can be attached to the roller.

[0012] The third sheet shutter is characterized in that the roller has a circular through hole in the center, the shaft body has an insertion portion formed at its end that is inserted into the circular through hole, and an elastic C-ring is provided on the outer circumferential surface of the insertion portion that can be reduced in diameter from a state larger than the circular through hole to a state smaller than the circular through hole.

[0013] The fourth sheet shutter is characterized in that the through hole has chamfered portions formed on both edges that expand outward in the axial direction.

[0014] The fifth sheet shutter is characterized in that the insertion portion has a tip hole formed at the tip of the insertion portion, a screw body that screws into the tip hole and closes the tip hole, and a cylindrical collar that fits over the screw body, and the elastic C ring is sandwiched between the tip of the insertion portion and the head of the screw body and mounted around the collar.

[0015] The method for changing the wind pressure resistance of a sheet shutter is a method for changing the wind pressure resistance of a sheet shutter as described above, and is characterized by comprising the steps of: removing the insertion portion of the shaft body from the roller; loosening the screw body from the tip hole and removing the screw body together with the collar fitted to the screw body and the elastic C-ring mounted around the collar; removing the elastic C-ring from around the collar; attaching another elastic C-ring with a different strength in the diameter contraction direction around the collar; fastening the screw body, with the collar fitted with the other elastic C-ring attached, to the tip hole; and inserting the insertion portion, with the collar fitted with the other elastic C-ring and the screw body fastened together, into the circular through hole of the roller.

[0016] A method for changing a shaftless sheet shutter to a shafted sheet shutter is a method for changing a shaftless sheet shutter, in which an outer rail is inserted into the groove of a pair of guide rails, the opening edge of the outer rail is fitted into the lip to hold the outer rail, an inner rail is detachably housed inside the outer rail, and guide projections attached to both ends of a shaftless sheet body without a shaft are engaged with the inner rail in a vertically sliding manner to house the shaftless sheet shutter, wherein the guide rail is made of metal, and the outer rail and inner rail are made of resin, and the method is characterized by comprising the steps of: removing the guide projections attached to both ends of the shaftless sheet body from the inner rail; removing the outer rail and inner rail from the guide rail; fitting the roller into the groove of the guide rail; and fitting the end of the shaft body to which the sheet body is fixed into the roller.

[0017] A method for using the guide rails of any of the first to fifth sheet shutters to serve as guide rails for both a shaft-equipped sheet shutter, in which the shaft is provided on the sheet body, and a shaftless sheet shutter, characterized in that an outer rail is inserted into the groove of the pair of guide rails in place of the roller of the shaft, the opening edge of the outer rail is fitted into the lip to hold the outer rail, an inner rail is detachably housed inside the outer rail, and guide projections attached to both ends of a shaftless sheet body, which does not have the shaft provided, are engaged with the inner rail in a way that allows them to slide up and down. [Effects of the Invention]

[0018] According to the first sheet shutter of the present invention, the shaft body is formed as a horizontal elongated shaft, and disc-shaped rollers are detachably fixed to both ends of the shaft body and inserted into a groove. The diameter of the rollers is longer than the width between the pair of lips of the groove. When a force greater than a predetermined amount is applied from a direction opposite to the sheet body, the shaft body bends, and the ends of the shaft body detach from the rollers. This allows the shaft body to detach from the groove of the guide rail during strong winds, thus deflecting the wind and preventing damage to the shaft body and guide rail from strong winds. In this configuration, only the shaft body detaches while the rollers remain in the groove, which allows for a simpler guide rail configuration compared to a configuration where the rollers are detached together. In other words, if the roller is designed to detach along with the sheet, it is necessary to hold the roller in place so that it does not detach from the groove of the guide rail when the wind pressure applied to the sheet is below a predetermined level, and if the wind pressure applied to the sheet exceeds a predetermined level, it becomes necessary to detach the roller, which would necessitate forming a part of the guide rail out of an elastic material. However, by designing the roller and shaft body to detach, it is not necessary to provide a mechanism such as an elastic claw on the guide rail side to allow the shaft to be attached and detached, and it can be constructed from a single extruded product, as well as reducing the size of the groove and lowering the manufacturing and transportation costs of the guide rail. Furthermore, since the roller, once detached from the shaft body, remains in the groove and falls out, it is possible to effectively prevent the roller from rolling out to the outside, which can prevent foreign matter from entering when installing a sheet shutter in a food factory, for example.

[0019] According to the second sheet shutter, the shaft is formed so that the shaft body, which has detached from the roller, can be attached to the roller again. Therefore, the shaft body, which has detached due to strong winds, can be reattached to the roller remaining in the groove.

[0020] According to the third sheet shutter, an insertion part formed at an end of the shaft body is inserted into the circular through-hole of the roller, and an elastic C-ring that can be reduced in diameter from a state with a larger diameter than the circular through-hole to a state with a smaller diameter is provided on the outer peripheral surface of the insertion part. Therefore, the rotor and the shaft body can be detachably connected with a simple structure.

[0021] According to the fourth sheet shutter, chamfered portions that expand in diameter toward the outside in the axial direction are formed at the edge portions on both sides of the through-hole. Therefore, when inserting and removing the insertion part of the shaft body from the circular through-hole of the roller, the elastic C-ring can smoothly reduce its diameter. Thus, by adjusting the elastic force of the elastic C-ring, the wind resistance strength of the sheet shutter can be easily adjusted.

[0022] According to the fifth sheet shutter, by removing the screw body, the elastic C-ring can be easily removed from the insertion part. Therefore, the elastic C-ring can be easily exchanged, the external force required for the shaft body to disengage from the roller can be changed, and the wind pressure resistance strength of the sheet shutter can be easily changed.

[0023] According to the method for changing the wind pressure resistance of the sheet shutter, by loosening and removing the screw body, both the collar externally fitted to the screw body and the elastic C-ring mounted around the collar can be removed. The elastic C-ring is removed from around the collar, and another elastic C-ring with a different strength in the diameter-reducing direction is attached around the collar. Then, by fastening the screw body with the other elastic C-ring and the collar externally fitted into the tip hole, the elastic C-ring can be exchanged very easily. And by changing the elastic C-ring to another elastic C-ring, the strength in the diameter-reducing direction can be changed. Therefore, the external force for the shaft body to disengage from the roller can be adjusted, the external force applied to the sheet body when disengaging the shaft body from the groove portion of the guide rail can be adjusted, and the wind pressure resistance of the sheet shutter can be changed very easily.

[0024] According to the method of changing a shaftless seat shutter to a shaft-equipped seat shutter, a shaftless seat shutter is formed by resin outer rails and inner rails on a metal guide rail. Due to the elastic deformation of the inner rail, guide protrusions attached to both ends of the shaftless seat body can be detached. Remove the guide protrusions from the inner rail, remove the inner rail from the outer rail, remove the outer rail from the guide rail, and then fit a roller into the groove of the guide rail and fit the insertion part of the shaft body into the circular through hole of the roller, so that the shaftless seat shutter can be changed to a shaft-equipped seat shutter. In this way, without replacing the guide rail, it can be changed from shaftless to shaft-equipped, so it is possible to switch from a shaftless seat shutter to a shaft-equipped seat shutter according to the situation of the installation location without requiring major construction work.

[0025] According to the method of using the guide rail in the shaft-equipped seat shutter and the shaftless seat shutter of the present invention, instead of the rollers of the shaft, insert the outer rail into the groove of the pair of guide rails, fit the opening edge of the outer rail to the lip to hold the outer rail, detachably house the inner rail in the outer rail, and engage and accommodate the guide protrusions attached to both ends of the shaftless seat body without a shaft provided on the inner rail so that they can slide up and down. In this way, the guide rails of the first to fifth seat shutters can also be used in the shaftless seat shutter, so the required number of parts can be reduced and the transportation cost can be reduced.

[0026] As described above, according to the present invention, the sheet shutter, the method for changing the wind pressure resistance of the sheet shutter, the method for changing a shaftless sheet shutter to a sheet shutter with a shaft, and the method for using a shaft-equipped sheet shutter and a shaftless sheet shutter as a guide rail, in the case of a shaftless sheet shutter, by making the outer rail and inner rail out of elastic resin, the guide rail itself can be made of a strong structure, for example, aluminum. In the case of a shaft-equipped sheet shutter, by making the shaft detachable from the shaft body and roller, the guide rail itself can be made of a strong structure, for example, aluminum.

[0027] Thus, the guide rails, whether shaftless or with a shaft, can be made of a strong and simple cross-sectional shape, such as aluminum. Therefore, the same guide rails can be used for both shaftless and shafted sheet shutters, and sheet shutters with a wide variety of widths, from 60 cm to 12 m, and requiring various wind resistance levels, can be constructed using frames formed from the same guide rails. This makes it possible to create groundbreaking entrances and exits, unprecedented in factory-less environments, logistics, manufacturing, transportation, and installation processes, as well as on-site connections, leading to a dramatic improvement in sheet shutters. [Brief explanation of the drawing]

[0028] [Figure 1] (A) is a front view illustrating the overall configuration of the sheet shutter, and (B) is an enlarged view of section α. [Figure 2] A horizontal cross-sectional view illustrating the state in which the shaft roller is inserted into the groove of the guide rail. [Figure 3] A partially abbreviated perspective view illustrating the overall structure of the shaft. [Figure 4] (A) is a front view illustrating the configuration of the end of the shaft, and (B) is a side view thereof. [Figure 5] An exploded perspective view illustrating the structure of the shaft's end. [Figure 6]This diagram illustrates the state of the shaft body's insertion portion being detached from the roller. (A) shows the state before detachment, (B) shows the state during detachment, and (C) shows the state after detachment. [Figure 7] (A) shows the insertion portion of the shaft body inserted into the circular through-hole of the roller, and (B) is a side view illustrating the state in which the insertion portion of the shaft body is being withdrawn from the circular through-hole of the roller. [Figure 8] This cross-sectional view illustrates the state in which the insertion portion of the shaft body has been detached from the roller, while the roller remains in the groove of the guide rail. [Figure 9] (A) is a front view illustrating the state in which the insertion part of the shaft body is attached to the roller, and (B) is an enlarged view of part β. [Figure 10] A front view illustrating the overall configuration of a shaftless sheet shutter. [Figure 11] A cross-sectional view illustrating the state in which the guide projections at the end of the sheet body of a shaftless sheet shutter are housed in the groove. [Figure 12] In a method for changing the wind pressure resistance of a sheet shutter, (A) is a perspective view illustrating the state in which the screw body, along with the collar and elastic C-ring, is removed from the insertion part of the shaft body, and (B) is a diagram illustrating the state in which the elastic C-ring is replaced with another elastic C-ring and attached around the collar that is fitted onto the screw body. [Figure 13] In a method for changing the wind pressure resistance of a sheet shutter, (A) is a cross-sectional view illustrating the state in which the screw body, along with the collar and elastic C-ring, is removed from the insertion part of the shaft body, and the elastic C-ring is further removed from the collar; (B) is a cross-sectional view illustrating the state in which another elastic C-ring is attached around the collar; and (C) is a cross-sectional view illustrating the state in which the screw body, along with the collar and another elastic C-ring, is screwed into the tip hole of the insertion part. [Figure 14] A cross-sectional view illustrating the removal of guide protrusions attached to both ends of the shaftless seat body from the inner rail. [Figure 15] A cross-sectional view illustrating the process of removing the inner and outer rails from the grooves of the guide rails. [Figure 16]A cross-sectional view illustrating the insertion of a roller into the groove of a guide rail. [Figure 17] A cross-sectional view illustrating the state in which the insertion portion of the shaft body, to which the sheet body is fixed, is inserted into the roller in the groove. [Modes for carrying out the invention]

[0029] The following describes embodiments of the sheet shutter 1 of the present invention and the method for using a shaft-equipped sheet shutter 10 and a shaftless sheet shutter 11 as guide rails, with reference to the figures. The sheet shutter 1 of this embodiment is installed, for example, in an opening in the exterior wall of a building such as a factory or warehouse, or in an opening in a partition wall separating two spaces inside a building. The sheet shutter 1 is designed to be transitionable between an open state that opens the opening and a closed state that closes the opening. The sheet shutter 1 includes a shaft-equipped sheet shutter 10, which is provided with a shaft 3 that reinforces the sheet body 2, and a shaftless sheet shutter 11, which is not provided with a shaft 3. However, in this embodiment, the sheet shutter 1 is a shaft-equipped sheet shutter 10 unless otherwise specified.

[0030] [About sheet shutters] As shown in Figure 1, the sheet shutter 1 comprises a flexible sheet body 2, a shaft 3 that reinforces the sheet body 2, a winding drum 4 provided above the opening of the building for winding up the sheet body 2, an opening and closing drive unit 5 that rotates the winding drum 4 in forward and reverse directions, and a pair of guide rails 6 erected on both side edges of the opening, each having a groove 60 that opens toward the opposite side, for guiding the sheet body 2 up and down.

[0031] The sheet body 2 is a rectangular curtain made of a synthetic resin material that is flexible, weather-resistant, and optionally light-transmitting or light-blocking. The sheet body 2 is a known resin sheet reinforced with, for example, fiberglass. The sheet body 2 is formed by overlapping and bonding two sheets together by heat welding, and a number of shafts 3 are arranged horizontally at intervals between the two sheets and fixed to the sheet body 2. The sheet body 2 maintains tension in the width direction by the shafts 3, while allowing the opening to be opened and closed. The upper end of the sheet body 2 is attached axially to the circumferential surface of the winding drum 4.

[0032] As shown in Figures 2 and 3, the shaft 3 has, for example, a shaft body 7 made of metal and formed to be elongated horizontally, and rollers 8 that are detachably fixed to both ends of the shaft body 7. As shown in Figures 3 to 5, the shaft body 7 is a long cylindrical rod with insertion portions 70 formed at both ends, which are tapered in diameter towards each end and inserted into circular through holes 80 of the rollers 8. The rollers 8 are formed to be disc-shaped and have a circular through hole 80 in the center. The rollers 8 are rotatably supported on the insertion portions 70 of the shaft body 7.

[0033] As shown in Figures 2, 5, and 6(C), the insertion portion 70 has a tip hole 92 formed at the tip of the insertion portion 70, a screw body 90 that screws into the tip hole 92 and closes the tip hole 92, and a cylindrical collar 91 that fits over the screw body 90. The insertion portion 79 has a locking groove 71 formed along the circumferential direction between its tip, the head of the screw body 90, and the outer surface of the collar 91. The elastic C-ring 9 is sandwiched between the tip of the insertion portion 70 and the head of the screw body 90 and mounted around the circumferential direction of the collar 91. The elastic C-ring 9 is formed by curving a linear spring steel material into an arc shape. Note that the elastic C-ring 9 is not limited to spring steel material, but may be made of, for example, an elastic resin. When no external force is applied, the elastic C-ring 9 is formed in an arc shape with an open range of, for example, 80 degrees. When an external force is applied in the direction of diameter reduction, it is completely housed within the locking groove 71 formed at the tip of the insertion portion 70, the head of the screw body 90, and the outer circumferential surface of the collar 91.

[0034] With this configuration, as shown in Figures 12 and 13, the elastic C-ring 9 can be easily removed from the insertion part 70 by detaching it from the tip hole 92 of the screw body 90, making it easy to replace the elastic C-ring 9, easily changing the external force required for the shaft body 7 to detach from the roller 8, and easily changing the wind pressure resistance strength of the sheet shutter 1.

[0035] As shown in Figures 5 and 6, the roller 8 is formed in a disc shape, and an outer peripheral groove 82 into which an O-ring 81 is fitted is formed on the outer circumference. The O-ring 81 is a cushioning material that prevents damage and noise caused by contact between the roller 8 and the groove 60 of the guide rail 6, and is made of, for example, resin. When the sheet shutter 1 is opened and closed, the roller 8 rotates as the O-ring 81 comes into contact with the inner surface of the groove 60 of the guide rail 6, smoothly raising and lowering the sheet body 2. The roller 8 is provided with a circular through hole 80 in the center. The circular through hole 80 is slightly larger in diameter than the insertion part 70, and is formed so that the insertion part 70 can be inserted. The circular through hole 80 has chamfered portions 83 formed on both axial edges, each expanding outward.

[0036] When the elastic C-ring 9 of the insertion portion 70 is not deformed, it has a larger diameter than the circular through-hole 80. As shown in Figures 6(A) and 7(A), when the insertion portion 70 is inserted into the circular through-hole 80, the elastic C-ring 9 catches, preventing the roller 8 from detaching from the insertion portion 70. On the other hand, as shown in Figures 6(B) and 7(B), when a wind pressure exceeding a predetermined amount is applied from a direction opposite to the sheet body 2, and an external force exceeding a predetermined amount is applied in the direction of pulling out the insertion portion 70, the elastic C-ring 9 elastically deforms in the direction of diameter reduction, passing through the circular through-hole 80 and causing the insertion portion 70 to detach from the circular through-hole 80 of the roller 8. At this time, since chamfered portions 83 are formed on both axial edges of the circular through-hole 80, the elastic C-ring 9 is pressed against the chamfered portions 83 by the force in the direction of pulling out the insertion portion 70, causing it to elastically deform in the direction of diameter reduction.

[0037] As shown in Figure 1, the winding drum 4 is housed in a storage box formed at the upper end of the opening, and rotates around its axis, enabling the winding and unwinding of the sheet body 2. The opening / closing drive unit 5 is a motor that can rotate the winding drum 4 in both forward and reverse directions.

[0038] As shown in Figures 1 and 2, a pair of guide rails 6 are fixed to support columns formed on both side edges of the opening. The guide rails 6 are formed in a vertically elongated column shape, for example, by aluminum extrusion molding. The guide rails 6 have a groove 60 into which the roller 8 is inserted, and hollow side column sections formed on both sides of the groove 60, which house a controller for controlling the sheet shutter 1, sensors, switches, signal lights and warning lights, various wiring, a fan that supplies warm or cool air to maintain the device at an appropriate temperature, and / or a battery.

[0039] The grooves 60 of the pair of guide rails 6 open on opposite sides and are rectangular in plan view, extending along the vertical direction. Lips 61 are provided at the opening edges of the grooves 60, approaching each other. The grooves 60 have a width that allows the roller 8 to be inserted, and the distance between the two lips 61 is shorter than the diameter of the roller 8, so that the roller 8 does not fall out of the grooves 60. Also, the distance between the two lips 61 is longer than the diameter of the insertion portion 70, so that the insertion portion 70 of the shaft body 7 can be detached from the grooves 60 while the roller 8 remains inside the grooves 60. Fixing grooves 62 are formed in the lips 61 along the vertical direction. The fixing grooves 62 are cylindrical inside and open narrowly toward the outer edge of the lip 61, and the base end of a vertically elongated fin 63 is fixed to the fixing grooves 62. The fins 63 contact the sheet body 2 and the shaft 3, ensuring airtightness in the gap between the groove 60 and the shaft 3, thereby preventing outside air from affecting the indoor environment.

[0040] When the sheet shutter 1, configured as described above, is in the closed state, as shown in Figures 2 and 6(A), if a wind pressure below a predetermined level is applied to the sheet body 2, the shaft 3 reinforcing the sheet body 2 will bend slightly. As a result, the insertion portion 70 at the end of the shaft 3 and the roller 8 will attempt to move away from the groove 60 of the guide rail 6. However, the roller 8 catches on the lip 61 of the groove 60, preventing the shaft 3 from detaching from the groove 60 of the guide rail 6. A wind pressure below a predetermined level refers to a wind pressure at which the shaft 3 and guide rail 6 will not be damaged according to the design. When a wind pressure exceeding a predetermined level is applied to the sheet body 2, as shown in Figures 6(B) and 7(B), the sheet body 2 flexes further, fixing the roller 8 in a state where it is caught on the lip 61 of the groove 60, and the insertion part 70 is pulled further in the detachment direction, causing the elastic C-ring 9 to shrink in diameter, and the insertion part 70 is pulled out from the circular through-hole 80 of the roller 8, as shown in Figures 6(C) and 8, leaving the roller 8 in the groove 60 while the shaft body 7 detaches from the groove 60. Here, a wind pressure exceeding a predetermined level refers to a wind pressure that may cause damage or breakage to the guide rail 6 or shaft 3, and in this embodiment, "force exceeding a predetermined level" refers to a wind pressure exceeding a predetermined level. "Force exceeding a predetermined level" in this invention is not limited to this, and includes various forces that may damage the guide rail 6 and shaft 3, such as the force applied to the sheet body 2 when a forklift collides with it due to misoperation, etc.

[0041] This allows the shaft body 7 to detach from the groove 60 and deflect strong winds, preventing damage to the shaft body 7 and guide rail 6 from strong winds. By leaving the roller 8 in the groove 60 while only the shaft body 7 detaches, there is no need to provide a mechanism for detaching the shaft 3 in the long guide rail 6 itself, thus allowing the guide rail 6 to have a simple and versatile configuration.

[0042] In other words, if the entire shaft 3, including the roller 8, is to be detached from the groove 60, it is necessary to provide a configuration that allows the roller 8, such as an elastic claw, to be attached and detached along the entire length of the guide rail 6. However, by detaching the roller 8 from the shaft body 7, the guide rail 6 can be made from an extruded product of a single material, and the size of the groove 60 can be reduced, thereby reducing the manufacturing and transportation costs of the guide rail 6.

[0043] Then, after the wind pressure on the sheet body 2 subsides, as shown in Figure 9, the roller 8 remaining in the groove 60 is lifted, and the shaft body 7 is held at an angle. The insertion part 70 is then pushed into the circular through hole 80 of the roller 8 in the groove 60, thereby reattaching the roller 8 to the shaft body 7. This allows the sheet shutter 1 to be returned to its normal state after the strong winds subside.

[0044] [Method for changing the wind pressure resistance of a sheet shutter] The method for changing the wind pressure resistance of the sheet shutter 1 involves first removing the insertion portion 70 of the shaft body 7 from the roller 8, as shown in Figures 6(A), 6(B), and 6(C). That is, the shaft body 7 is pulled to pull out the insertion portion 70 that is inserted into the circular through hole 80 of the roller 8. As shown in Figure 6(A), the insertion portion 70 is hooked onto the roller 8 by an elastic C-ring 9 fitted into a locking groove 71 formed by the tip of the insertion portion 70, the screw body 90, and the collar 91. However, when it comes into contact with the chamfered portion 83 of the circular through hole 80 and is pulled with a force greater than a predetermined amount, it shrinks in diameter and, as shown in Figure 6(B), passes through the circular through hole 80, and as shown in Figure 6(C), the insertion portion 70 detaches from the roller 8. At this time, the roller 8 remains in the groove 60 of the guide rail 6.

[0045] Next, as shown in Figure 12(A), the screw body 90 that is screwed onto the tip of the insertion portion 70 of the pulled-out shaft body 7 is loosened, and the screw body 90 is removed from the tip hole 92 of the insertion portion 70. At this time, a collar 91 is fitted onto the screw body 90, and an elastic C-ring 9 is attached around the collar 91, so the screw body 90 is removed together with the collar 91 and the elastic C-ring 9.

[0046] Then, as shown in Figures 12(B) and 13, the elastic C-ring 9 is removed from around the collar 91 that is fitted onto the screw body 90. Since the screw body 90 has been removed from the tip hole 92 of the insertion part 70, the elastic C-ring 9 can be removed from the tip side of the screw body 90 without deformation.

[0047] Next, another elastic C-ring with different strengths in the diameter-reducing direction is attached around the collar. Here, "strength in the diameter-reducing direction" refers to the load required to elastically deform the elastic C-ring in the diameter-reducing direction. The elastic C-ring 9 and the other elastic C-ring 93 may have different strengths in the diameter-reducing direction by being made of materials with different elastic moduli, or they may have different strengths in the diameter-reducing direction by changing the cross-sectional area of ​​the elastic C-ring 9 and the other elastic C-ring 93 or their diameter when no external force is applied.

[0048] After attaching another elastic C-ring 93 to the collar 91 which is fitted onto the screw body 90, the screw body 90 is fastened to the tip hole 92 of the insertion part 70. This forms a locking groove 71 around the collar 91 with the tip of the insertion part 70, the screw head of the screw body 90, and the collar 91, and another elastic C-ring 93 is fitted into the locking groove 71. Next, the insertion part 70, with the collar 91 and screw body 90 fastened together, is inserted into the circular through hole 80 of the roller 8 remaining in the groove 60.

[0049] Thus, according to the method for changing the wind pressure resistance of the sheet shutter in this embodiment, by loosening and removing the screw body 90, both the collar 91 fitted onto the screw body 90 and the elastic C-ring 9 mounted around the collar 91 can be removed. The elastic C-ring 9 can then be removed from around the collar 91, and another elastic C-ring 93 with different strength in the diameter contraction direction can be attached around the collar 91. After that, the screw body 90 can be fastened to the tip hole 92, making it extremely easy to replace the elastic C-rings 9 and 93. By changing the elastic C-ring 9 to another elastic C-ring 93, the strength in the diameter contraction direction can be changed, which allows for adjustment of the external force required when the shaft body 7 detaches from the roller 8, and adjusts the load applied to the sheet body 2 when the shaft body 7 detaches from the groove 60 of the guide rail 6, thereby extremely easily changing the wind pressure resistance characteristics of the sheet shutter 1.

[0050] [Method for using shaft-type and shaftless sheet shutters as guide rails] The sheet shutter 1 of this embodiment is a sheet shutter 10 with a shaft, which allows the opening to be opened and closed while the sheet body 2 maintains tension in the width direction by the shaft 3. Furthermore, by making the roller 8 detachable, the structure of the guide rail 6 itself can be simplified, so that the guide rail 6 can also be used as the guide rail 6 in a shaftless sheet shutter 11. Specifically, as shown in Figures 10 and 11, an outer rail 12 is inserted into the groove 60 of a pair of guide rails 6 in place of the roller 8 of the shaft 3, and a fitting portion 13 formed on the opening edge of the outer rail 12 is fitted into the lip 61 to hold the outer rail 12 in the groove 60, and an inner rail 14 is detachably housed inside this outer rail 12, and guide projections 21 attached to both ends of a shaftless sheet body 20 (which does not have a shaft 3) are engaged with the inner rail 14 in a vertically sliding manner to house it, thereby forming a shaftless sheet shutter 11.

[0051] The guide rail 6 is made of a metal such as aluminum, and the outer rail 12, which is inserted into the groove 60 of the guide rail 6, has a U-shaped cross-section and a fitting portion 13 is formed on the open end side that fits into a lip 61 formed in the groove 60. The inner rail 14 is integrally composed of an inner locking portion 15 with a rectangular cylindrical cross-section that is housed in the back of the outer rail 12 in a plan view, and an engaging guide 16 that inserts and locks a guide projection 21 which is positioned adjacent to the inner locking portion 15 on the front side of the outer rail 12. The outer rail 12 and inner rail 14 are made of resin, for example, and the fitting portions 13 formed on both of the open ends of the outer rail 12 are elastically deformable in the direction of approaching each other. A guide pin 17 is housed within the inner locking portion 15, the outer end of which penetrates both the inner locking portion 15 and the outer wall of the outer rail 12. A coil spring 18, which is attached to the guide pin 17, ensures that the inner locking portion 15 is always pressed outward and elastically against the outer rail 12.

[0052] Due to the traction action of the coil spring 18, the seat body 20 is elastically pulled in a direction that extends to both the left and right sides, with the guide projections 21 at its ends housed and locked within the engagement guide 16, and moves up and down and opens and closes while being slidably guided by the engagement guide 16 at both ends.

[0053] When strong wind pressure is applied to the seat body 20, the inner rail 14 is pulled inward via the guide projection 21 and the engaging guide 16 and against the coil spring 18. If an even stronger force is applied, the inner open end of the engaging guide 16 elastically opens, pulling the guide projection 21 out from inside the engaging guide 16, disengaging the two, and protecting the seat body 20 and the inner rail 14 from being overloaded.

[0054] As described above, by using the same guide rail 6 for both the shaft-equipped sheet shutter 10 and the shaftless sheet shutter 11, the number of required parts can be reduced, and transportation costs can be reduced.

[0055] [How to change a shaftless sheet shutter to a sheet shutter with a shaft] When a shaftless sheet shutter 11 is installed, there may be cases where it is desirable to change to a shafted sheet shutter 10, for example, if the wind effect is stronger than expected. The configuration of the shaftless sheet shutter 11 is explained in the description above regarding the method of using shafted and shaftless sheet shutters as guide rails, so the explanation is omitted here.

[0056] In the method of changing the shaftless sheet shutter 11 to a shafted sheet shutter 10, first, as shown in Figure 14, the guide projections 21 attached to both ends of the shaftless sheet body 20 are removed from the inner rail 14. When a force is applied to the shaftless sheet body 20 in a direction that pulls it out of the groove 60 of the guide rail 6, the inner rail 14 slides against the coil spring 18 in a direction that pulls it out of the groove 60 within the outer rail 12, and further the guide projections 21 push open the engagement guide 16 of the inner rail 14, causing the guide projections 21 to disengage from the engagement guide 16 and detach from the inner rail 14.

[0057] Next, as shown in Figure 15, the fitting portions 13 formed at the open ends on both sides of the outer rail 12 are elastically deformed in a direction that brings them closer together to release the engagement between the lip 61 of the groove 60 of the guide rail 6, and the outer rail 12 together with the inner rail 14 is removed from the groove 60. In this embodiment, the guide rail 6 is made of robust aluminum, and even if some load is applied when removing the resin inner rail 14 and outer rail 12, the guide rail 6 itself will not be damaged. Furthermore, by making the device that holds the guide projection 21 of the shaftless seat body 20 a separate component from the guide rail 6, the complex structure of the guide rail 6 itself can be suppressed, and the guide rail 6 can be used in a seat shutter 10 with a shaft.

[0058] Next, the roller 8 is inserted into the groove 60 of the guide rail 6. The roller 8 is inserted diagonally between the lips 61, and is held within the groove 60 so that the circular through hole 80 of the roller 8 faces the opening between the lips 61. At this time, the base end of the fin 63 may be fixed to the fixing groove 62. Then, the insertion part 70 formed at the end of the shaft body 7 to which the sheet body 2 is fixed is fitted into the circular through hole 80 of the roller 8. The elastic C-ring 9 of the insertion part 70 comes into contact with the chamfered part 83 on the front side of the groove 60 of the circular through hole 80, and is further pressed, causing the elastic C-ring 9 to shrink in diameter, the insertion part 70 to pass through the circular through hole 80, and the elastic C-ring 9 expands in diameter at the back of the groove 60 of the circular through hole 80, connecting the roller 8 and the shaft body 7.

[0059] As described above, when easily changing from a shaftless sheet shutter 11 to a sheet shutter 12 with a shaft, it is not necessary to replace the guide rail 6, and no major construction work is required.

[0060] Thus, according to the sheet shutter 1 of this embodiment, the method for changing the wind pressure resistance of the sheet shutter, the method for changing a shaftless sheet shutter to a sheet shutter with a shaft, and the method for using both a shafted sheet shutter and a shaftless sheet shutter as guide rails, in the case of a shaftless sheet shutter 11, by making the outer rail 12 and inner rail 14 out of elastic resin, the guide rail 11 itself can be made into a robust aluminum structure. In the case of a shafted sheet shutter 10, by making the shaft 3 detachable from the shaft body 7 and the roller 8, the guide rail 6 does not need to have a complex structure, so it can be made into a single robust aluminum structure, and the shaftless and shafted sheet shutters 10 and 11 can be configured with the same guide rail.

[0061] According to the method of this embodiment, the wind pressure resistance characteristics of the sheet shutter 1 can be easily changed by simply replacing the elastic C-rings 9, 93, and it is also easy to switch between shaftless and shafted sheet shutters 10, 11, so that even if the entrance width varies from 60 cm to 12 m, it can be constructed with the same guide rail 6. Since sheet shutters 1 that require various wind resistance strengths can be constructed with a frame formed from the same guide rail 6, it is possible to construct an unprecedented and groundbreaking entrance in factory-less environments, logistics, manufacturing, transportation, installation processes, and on-site connections, thereby achieving a dramatic improvement in sheet shutters 1.

[0062] It goes without saying that the embodiments of the present invention are not limited to those described above, and can be modified as appropriate without departing from the scope of the spirit of the present invention. [Industrial applicability]

[0063] The sheet shutter, method for changing the wind pressure resistance of a sheet shutter, method for changing a shaftless sheet shutter to a sheet shutter with a shaft, and method for using a shaft-equipped sheet shutter and a shaftless sheet shutter as a guide rail according to the present invention are suitable, for example, for use as a sheet shutter at the entrance and exit of loading and unloading vehicles in factories and warehouses, a method for changing the wind pressure resistance of a sheet shutter, a method for changing a shaftless sheet shutter to a sheet shutter with a shaft, and a method for using a shaft-equipped sheet shutter and a shaftless sheet shutter as a guide rail. [Explanation of Symbols]

[0064] 1 sheet shutter 2 sheets 3 shafts 4 reel drums 5 Opening / closing drive unit 6 Guide rails 7. Shaft body 8 Laura 9 Elastic C-ring 10. Sheet shutter with shaft 11. Shaftless sheet shutter 20 Shaftless seat body 21 Guide projection 60 groove 61 Lip 70 Insertion part 80 circular through holes 83 Chamfered part 90 Screw body 91 Colors 92 Tip hole 93 Another elastic C-ring

Claims

1. A sheet shutter that can open and close to separate an opening in a building, A flexible sheet body, A shaft is fixed horizontally across the width direction of the sheet body and reinforces the sheet body, A winding drum is provided above the opening for winding the sheet body, An opening and closing drive unit that rotates the winding drum in the forward and reverse directions, A pair of guide rails are provided, each erected on both edges of the opening and having grooves formed that open toward the opposite sides, for guiding the sheet body up and down. Equipped with, The shaft comprises a shaft body formed in a horizontal, elongated shape, and disc-shaped rollers detachably fixed to both ends of the shaft body and inserted into the groove. The groove has a pair of lips whose opening edges extend in a direction toward each other, and the roller is formed with a diameter longer than the width between the pair of lips. When a force exceeding a predetermined amount is applied from a direction opposite to the sheet body, the shaft body bends, and the end of the shaft body detaches from the roller. Sheet shutter.

2. The shaft is formed such that the shaft body, which has been detached from the roller, can be attached to the roller. The sheet shutter according to claim 1.

3. The roller has a circular through hole in the center, The shaft body has an insertion portion formed at its end that is inserted into the circular through hole. An elastic C-ring is provided on the outer circumferential surface of the insertion portion, which can be reduced in diameter from a state larger than the circular through hole to a state smaller than the circular through hole. The sheet shutter according to claim 2.

4. The circular through-hole has chamfered portions formed on both edges that widen outward in the axial direction. The sheet shutter according to claim 3.

5. The aforementioned insertion portion is The tip hole formed at the tip of the insertion part, The screw body is screwed into the aforementioned tip hole to seal the tip hole, and its head has a larger diameter than the tip of the insertion part. A cylindrical collar that fits onto the screw body, It has, The elastic C-ring is sandwiched between the tip of the insertion part and the head of the screw body and is mounted around the collar. The sheet shutter according to claim 4.

6. A method for changing the wind pressure resistance of a sheet shutter according to claim 5, The steps include removing the insertion portion of the shaft body from the roller, The process involves loosening the screw body from the tip hole and removing the screw body together with the collar that fits onto the screw body and the elastic C-ring that is mounted around the collar, The process of removing the elastic C-ring from the circumference of the collar, A step of attaching another elastic C-ring with different strengths in the diameter contraction direction around the collar, The process of fastening the screw body, with the collar fitted onto which the other elastic C-ring is attached, into the tip hole, The steps include inserting the collar to which the other elastic C-ring is attached and the insertion part to which the screw body is fastened into the circular through hole of the roller, A method for changing the wind pressure resistance of a sheet shutter, which includes the following features.

7. A method for changing a shaftless sheet shutter, in which an outer rail is inserted into the groove of the pair of guide rails, the opening edge of the outer rail is fitted into the lip to hold the outer rail, an inner rail is detachably housed inside the outer rail, and guide projections attached to both ends of a shaftless sheet body without a shaft are engaged with the inner rail in a vertically sliding manner to house it, to a sheet shutter with a shaft as described in any of claims 1 to 5, The guide rail is made of metal, and the outer rail and inner rail are made of resin. The steps include removing the guide protrusions attached to both ends of the shaftless seat body from the inner rail, The process of removing the outer rail and inner rail from the guide rail, The process of fitting the roller into the groove of the guide rail, The process of fitting the end of the shaft body to which the sheet body is fixed onto the roller, A method for changing a shaftless sheet shutter to a sheet shutter with a shaft.

8. A method for using the guide rail of a sheet shutter according to any one of claims 1 to 5 to serve as both a guide rail in a shaft-equipped sheet shutter in which the shaft is provided on the sheet body and a shaftless sheet shutter, The outer rail is inserted into the groove of the pair of guide rails in place of the roller of the shaft, and the opening edge of the outer rail is fitted into the lip to hold the outer rail in place. The inner rail is detachably housed within the outer rail, Guide projections attached to both ends of a shaftless seat body, which does not have the shaft provided on the inner rail, are engaged with the inner rail in a way that allows them to slide up and down, thereby housing the seat body. A method for using a shaft-equipped sheet shutter and a shaftless sheet shutter as both guide rails.

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