Sheet shutter

Abstract

To suppress a sheet curtain from swelling up when wind pressure is applied to the sheet curtain.SOLUTION: A sheet shutter includes a sheet curtain that moves in the vertical direction and separates an area on one side from an area on the other side, engaging elements that are attached to both end parts of the sheet curtain and arranged in a row in the direction in which the sheet curtain is folded, a pair of guide rails which extend in the vertical direction so as to sandwich the sheet curtain and on which engagement portions are formed with which the engaging elements can engage so as to be movable in the vertical direction, and a valve that is attached to the sheet curtain and has a flow path formed that allows air to flow between the area on one side and the area on the other side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sheet shutter. [Background technology]

[0002] Patent document 1 describes an architectural sheet shutter in which anti-slip means are provided at both ends of the shutter curtain to prevent it from slipping out of the guide rail, and in the lower half of the shutter curtain, multiple rod-shaped bodies are located in the excess extension part, with both ends inserted into the guide rail so that they can move freely up and down, and are arranged approximately parallel to the pillar at predetermined intervals in the vertical direction, so that when the rod-shaped bodies abut against each other and the shutter curtain is closed, curved bulges in the excess length are formed between each rod-shaped body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-221986 Summary of the Invention

[0004] Conventionally, in a sheet shutter that opens or closes an opening, multiple resin engaging elements that engage with guide rails are provided at both ends of the sheet curtain. Specifically, a pair of guide rails are provided that extend vertically from the width direction of the sheet curtain to sandwich the sheet curtain. These guide rails are made of resin, and the guide rails are formed with engaged portions that engage with the engaging elements provided at both ends of the sheet curtain. The sheet curtain moves vertically with the engaging elements provided on the sheet curtain engaged with the engaged portions of the guide rails.

[0005] Here, when wind pressure is applied to the sheet curtain while it is blocking the opening, the sheet curtain will bulge because the engaging elements on both ends of the sheet curtain engage with the engaged portions of the curtain rail.

[0006] An object of the present disclosure is to prevent a sheet curtain from expanding when wind pressure is applied to the sheet curtain. [Means for solving the problem]

[0007] The sheet shutter according to the first aspect of the present disclosure is characterized by comprising: a sheet curtain that moves in an up-and-down direction and separates an area on one side from an area on the other side; a plurality of engaging elements attached to both ends of the sheet curtain in the width direction and aligned in the direction of movement of the sheet curtain; a pair of guide rails extending in the up-and-down direction from the width direction while sandwiching the sheet curtain and having engaging portions with which the engaging elements can engage so as to be movable in the up-and-down direction; and a valve attached to the sheet curtain and having a flow path formed therein to allow air to flow between the area on one side and the area on the other side.

[0008] According to the above configuration, when wind pressure is applied to the sheet curtain, the engaging elements at both ends of the sheet curtain engage with the engaged portions of the guide rails, causing the sheet curtain to inflate. However, the sheet curtain is provided with a valve having a flow path that allows air to flow between one side and the other side. The air escapes through the flow path formed in the valve, thereby weakening the wind pressure applied to the sheet curtain. In this way, the sheet curtain can be prevented from inflating when wind pressure is applied to it.

[0009] The sheet shutter according to the second aspect of the present disclosure is characterized in that, in the sheet shutter described in the first aspect, the valve is provided with an opening / closing lid that opens and closes the flow path, and the opening / closing lid opens the flow path by wind pressure applied to the sheet curtain.

[0010] According to the above configuration, the open / close lid opens the flow path when wind pressure is applied to the sheet curtain, whereas when wind pressure is not applied, the open / close lid closes the flow path, thereby preventing foreign matter and the like from moving through the flow path between the one area and the other area.

[0011] A sheet shutter according to a third aspect of the present disclosure is characterized in that, in the sheet shutter described in the first or second aspect, a gear member is provided which is arranged at the upper end portion of the sheet curtain, has a plurality of engaging recesses arranged circumferentially to engage with the engaging elements, and rotates to sequentially engage the engaging elements with the engaging recesses and move the sheet curtain in the vertical direction, and the valve is arranged in the central portion of the width direction of the sheet curtain and at the lower end portion of the sheet curtain in the vertical direction.

[0012] According to the above configuration, when wind pressure is applied to the sheet curtain, the amount of expansion at the bottom end of the sheet curtain in the vertical direction and at the center of the sheet curtain in the width direction is greater than the amount of expansion at other parts of the sheet curtain. Here, the valve is located at the center of the sheet curtain in the width direction and at the bottom end of the sheet curtain in the vertical direction. As a result, when wind pressure is applied to the sheet curtain, the wind pressure applied to the sheet curtain is effectively weakened compared to when the valve is located at the top end of the sheet curtain, and expansion of the sheet curtain can be effectively suppressed.

[0013] A sheet shutter according to a fourth aspect of the present disclosure is the sheet shutter according to the first or second aspect, characterized in that it is arranged at the upper end portion of the sheet curtain, has a plurality of engaging recesses arranged circumferentially to engage with the engaging elements, and is provided with a gear member that rotates to sequentially engage the engaging elements with the engaging recesses and move the sheet curtain in an up-and-down direction, and the valves are arranged in a central portion in the width direction of the sheet curtain and in a plurality of rows in the up-and-down direction of the sheet curtain, and the flow path cross-sectional area of ​​the flow path of one of the valves arranged at the bottom is larger than the flow path cross-sectional area of ​​the flow path of another of the valves arranged above the one of the valves.

[0014] According to the above configuration, when wind pressure is applied to the sheet curtain, the sheet curtain expands. Specifically, the amount of expansion at the bottom end of the sheet curtain in the vertical direction and at the center of the sheet curtain in the width direction is greater than the amount of expansion at other parts of the sheet curtain.

[0015] Here, the cross-sectional area of ​​the flow path of one valve arranged below is made larger than the cross-sectional area of ​​the flow path of another valve arranged above the first valve. As a result, when wind pressure is applied to the sheet curtain, the wind pressure applied to the sheet curtain is effectively weakened compared to when the cross-sectional areas of the flow paths of valves arranged vertically are the same, and inflation of the sheet curtain can be effectively suppressed. [Effects of the Invention]

[0016] According to the present disclosure, when wind pressure is applied to the sheet curtain, the sheet curtain can be prevented from expanding. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a perspective view showing a sheet shutter according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view showing the upper end portion of the sheet shutter according to the first embodiment of the present disclosure. [Figure 3] 1 is a perspective view showing a guide rail, a side frame, etc. provided in a sheet shutter according to a first embodiment of the present disclosure. FIG. [Figure 4] 1 is an enlarged perspective view showing a curtain unit and an engagement element provided in a sheet shutter according to a first embodiment of the present disclosure. FIG. [Figure 5] 1 is a perspective view showing a curtain unit and an engaging element provided in a sheet shutter according to a first embodiment of the present disclosure. FIG. [Figure 6] 1A and 1B are a plan view and a side view showing an engaging element provided in a sheet shutter according to a first embodiment of the present disclosure. [Figure 7] 1 is an exploded perspective view showing a curtain unit provided in a sheet shutter according to a first embodiment of the present disclosure. FIG. [Figure 8] 11 is an enlarged side view of a region G01 in FIG. 10, illustrating engagement between an engagement element and an engagement recess in the sheet shutter according to the first embodiment of the present disclosure. FIG. [Figure 9] 1 is an exploded perspective view showing a gear member, a contact block, a curtain unit, etc. of a sheet shutter according to a first embodiment of the present disclosure. FIG. [Figure 10] 1 is a side view showing a gear member, a contact block, a curtain unit, etc. of a sheet shutter according to a first embodiment of the present disclosure. FIG. [Figure 11] 2 is a cross-sectional view showing a guide unit and the like provided in the sheet shutter according to the first embodiment of the present disclosure. FIG. [Figure 12] 1A and 1B are state diagrams showing a state in which no wind pressure is applied to the sheet curtain and a state in which wind pressure is applied to the sheet curtain in the sheet shutter according to the first embodiment of the present disclosure. [Figure 13] 1A and 1B are state diagrams showing a state in which no wind pressure is applied to the sheet curtain and a state in which wind pressure is applied to the sheet curtain in the sheet shutter according to the first embodiment of the present disclosure. [Figure 14] FIG. 10 is a perspective view showing a sheet shutter according to a second embodiment of the present disclosure. [Figure 15] 10A and 10B are state diagrams showing a state in which no wind pressure is applied to the sheet curtain and a state in which wind pressure is applied to the sheet curtain in a sheet shutter according to a second embodiment of the present disclosure. [Figure 16] FIG. 10 is a perspective view showing a sheet shutter according to a third embodiment of the present disclosure. [Figure 17] 10A and 10B are state diagrams showing a state in which wind pressure is not applied to the sheet curtain and a state in which wind pressure is applied to the sheet curtain in a sheet shutter according to a third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0018] First Embodiment An example of a sheet shutter according to a first embodiment of the present disclosure will be described with reference to Figures 1 to 13. Note that arrow H shown in the figures indicates the up-down direction (vertical direction) of the sheet shutter, arrow W is perpendicular to arrow H and indicates the width direction (horizontal direction) of the sheet shutter, and arrow L is perpendicular to arrows H and W and indicates the depth direction (horizontal direction) of the sheet shutter.

[0019] (Overall composition) The sheet shutter 10 is a sheet shutter that is attached to the entrance of a warehouse or the like, and as shown in Figures 1 and 2, it comprises a frame 12, a guide unit 14, a take-up roll 20, a curtain unit 30, a drive roll 60, and a contact block 80. The frame 12, the guide unit 14, the take-up roll 20, the curtain unit 30, the drive roll 60, and the contact block 80 are symmetrical in the width direction with respect to a center line CL11 of the sheet shutter 10.

[0020] [Frame 12] 1, the frame 12 includes a pair of side frames 22 and a shutter case 18. The pair of side frames 22 extend vertically and are arranged on both sides of the delivery entrance in the width direction, at both ends of the curtain unit 30 in the width direction.

[0021] 2, the cross section of the side frame 22 is C-shaped with the inside in the width direction open. In this embodiment, the inside in the width direction is the side facing the center part of the width direction of the sheet shutter 10, and the outside in the width direction is the side opposite to the side facing the center part of the width direction of the sheet shutter 10. Furthermore, a guide unit 14 extending in the vertical direction is attached to each of the pair of side frames 22.

[0022] The shutter case 18 extends in the width direction at the upper ends of the pair of side frames 22 and spans the pair of side frames 22. The cross section of the shutter case 18 is rectangular and extends in the depth direction.

[0023] [Winding roll 20] As shown in FIG. 2, the winding roll 20 is disposed inside the shutter case 18 on one side in the depth direction (the right side in the figure), and an end of the curtain unit 30 is attached to the winding roll 20.

[0024] The winding roll 20 extends in the width direction, and the axial direction of the winding roll 20 is the width direction. Furthermore, the winding roll 20 is rotatably supported by a frame member (not shown). The winding roll 20 is biased by a biasing member (not shown) so as to rotate in a direction in which the curtain unit 30 is wound up (hereinafter referred to as the "winding direction").

[0025] In this configuration, a force acts on the curtain unit 30 in the direction in which it is wound by the winding roll 20 .

[0026] [Curtain Unit 30] When the curtain unit 30 closes the entrance of a warehouse or the like, the curtain unit 30 is disposed between a pair of side frames 22 as shown in Fig. 1. The curtain unit 30 separates the interior area of ​​the warehouse or the like from the exterior area of ​​the warehouse or the like.

[0027] 3 and 4, the curtain unit 30 includes a sheet curtain 32 and a pair of wires 36 provided at both widthwise end portions of the sheet curtain 32. The curtain unit 30 further includes a plurality of engaging elements 40 attached to both widthwise end portions of the sheet curtain 32 and arranged side by side in the vertical direction (the movement direction of the curtain unit 30), and screws 38 for attaching the engaging elements 40 to the sheet curtain 32.

[0028] 1, a valve 90 is attached to the sheet curtain 32. The valve 90 has a flow path 92a formed therein, which allows air to flow between an internal area of ​​the warehouse or the like and an external area of ​​the warehouse or the like. The internal area of ​​the warehouse or the like is an example of an area on one side, and the external area of ​​the warehouse or the like is an example of an area on the other side. The valve 90 will be described in detail later.

[0029] -32 sheet curtains, 36 wires- The sheet curtain 32 is formed in a sheet shape from a resin material, and has a rectangular shape extending in the vertical direction (movement direction) when viewed from the depth direction, as shown in Fig. 1. In other words, the thickness direction of the sheet curtain 32 is the depth direction. The end of the sheet curtain 32 in the movement direction is attached to the winding roll 20, as shown in Fig. 2.

[0030] 4 and 5, both ends of the sheet curtain 32 in the width direction are folded back. Furthermore, the tip of the folded back portion is fused to the other overlapping portion of the sheet curtain 32. As a result, a hollow portion 32a is formed at the base end of the folded back portion of the sheet curtain 32.

[0031] The wire 36 is disposed in the hollow portion 32a and extends in the direction of movement of the sheet curtain 32, and is provided at both ends in the width direction of the sheet curtain 32. The wire 36 is formed by twisting together a plurality of wires such as steel wires. In this way, by disposing the wire 36 in the hollow portion 32a, both ends in the width direction of the sheet curtain 32 bulge in the thickness direction of the sheet curtain 32 compared to other portions.

[0032] - Engagement element 40, screw 38 - The engaging elements 40 are attached to both end portions in the width direction of the sheet curtain 32, and as shown in Figures 4 and 5, a plurality of engaging elements 40 are lined up in the moving direction of the sheet curtain 32. In other words, a plurality of engaging elements 40 are lined up in the winding direction of the sheet curtain 32. The engaging elements 40 are integrally molded using a resin material (in this embodiment, polyacetal (POM)).

[0033] As shown in Figure 6(A), when viewed from above, the engaging element 40 has a rectangular shape with a U-shaped groove 42 that opens on the inner side in the width direction, and protrusions 44 are formed at the opening ends of the groove 42.

[0034] Furthermore, a gradually changing portion 42a is formed on the inner side of the width of the groove 42, where the opening width gradually widens toward the inside in the width direction when viewed from above. Also, an elliptical circular portion 42b with a wider width is formed on the outer side of the width of the groove 42, when viewed from above. Both widthwise ends of the sheet curtain 32, which is expanded by the wire 36 (see FIG. 4), are arranged in this circular portion 42b.

[0035] Furthermore, the engaging element 40 is formed with a side surface 40a facing outward in the width direction, and a through-hole 46 having a circular cross section that penetrates from the side surface 40a to the circular portion 42b of the groove portion 42. The outer portion of this through-hole 46 in the width direction is formed with an expanding diameter portion 46a whose diameter dimension gradually increases toward the outside in the width direction.

[0036] As shown in Figures 4 and 7, a screw 38 is inserted into this through hole 46 from the outside in the width direction, and the tip portion of the screw 38 is screwed into the wire 36, thereby attaching the engaging element 40 to both ends of the sheet curtain 32 in the width direction.

[0037] The screw 38 is a countersunk tapping screw, and with the tip end of the screw 38 screwed into the wire 36, the head of the screw 38 is positioned in the expanded diameter portion 46a of the through hole 46. This allows the head of the screw 38 to fit within the expanded diameter portion 46a of the through hole 46 and not protrude from the side surface 40a of the engaging element 40.

[0038] Furthermore, as shown in Figures 6(B) and 8, the engaging element 40 is formed with a contact portion 50 that contacts the contact block 80 and an engaging portion 54 that engages with an engaging recess 66 of a gear member 64 provided on the drive roll 60.

[0039] [Drive roll 60] 2, the drive roll 60 is located at the upper end portion of the sheet curtain 32, on the other side in the depth direction (the left side in the figure) inside the shutter case 18, and above the pair of side frames 22. In addition, a portion of the curtain unit 30 that can be wound by or unwound from the winding roll 20 is wound around the drive roll 60.

[0040] The drive roll 60 extends in the width direction, with the axial direction of the drive roll 60 being the width direction. The drive roll 60 is rotatably supported by a frame member (not shown). The drive roll 60 includes a roll body 62 extending in the width direction and a pair of gear members 64 attached to both ends of the roll body 62 in the width direction.

[0041] 9, the gear member 64 is made of metal and has an annular shape, and a plurality of engaging recesses 66 that engage with the engaging portions 54 of the engaging pieces 40 are formed side by side in the circumferential direction on the outer peripheral surface of the gear member 64. In addition, a flange 78 that protrudes radially outward relative to other portions is formed on the outer side of the gear member 64 in the width direction.

[0042] 8, the engagement recess 66 has a pair of side flat surfaces 66a formed on both end portions in the gear circumferential direction, and a bottom surface 66b sandwiched between the pair of side flat surfaces 66a and facing outward in the radial direction of the gear member 64 (hereinafter referred to as the "gear radial direction"). The side flat surfaces 66a are flat, and the bottom surface 66b is curved and convex inward in the gear radial direction.

[0043] Furthermore, the driving roll 60 is rotated in both positive and negative directions by the driving force transmitted from a motor (not shown).

[0044] [Contact block 80] The contact blocks 80 are made of metal and are arranged at the other depth side and both widthwise end sides inside the shutter case 18, as shown in Fig. 2. Specifically, the contact blocks 80 are arranged on the opposite side of the gear member 64 with the engaging element 40 sandwiched therebetween, as shown in Fig. 10.

[0045] The contact block 80 is formed in an arc shape and is attached to a frame member (not shown). The contact block 80 has an inner peripheral surface 80a facing the gear member 64 side.

[0046] In this configuration, when the engaging element 40 engaged with the engaging recess 66 of the gear member 64 moves outward in the gear radial direction, the inner circumferential surface 80a of the contact block 80 comes into contact with the contact portion 50 of the engaging element 40. This maintains the engagement between the engaging recess 66 of the gear member 64 and the engaging element 40.

[0047] [Guide unit 14] The guide units 14 are provided as a pair, extending vertically so as to sandwich the sheet curtain 32 in the width direction, and are arranged inside the side frames 22 and attached to the side frames 22 as shown in Fig. 11. An engaging element 40 attached to the sheet curtain 32 engages with an engaged portion 100a formed on a guide rail 100 provided on the guide unit 14 so as to be movable vertically.

[0048] Specifically, the guide unit 14 includes a guide rail 100 , a retainer 140 , and a mounting bolt 150 .

[0049] -Guide Rail 100- The guide rail 100 is molded using high-density polyethylene (HDPE), a resin material, and extends in the vertical direction. The guide rail 100 is formed with a recessed engaged portion 100a that is open on the inside in the width direction, as shown in Fig. 11. Furthermore, a pair of flanges 102 are formed at the opening of the engaged portion 100a, protruding in opposing directions, to prevent the engaging element 40 engaged with the engaged portion 100a from slipping out of the engaged portion 100a.

[0050] Meanwhile, on the outer side of the guide rail 100 in the width direction, a pair of recesses 106 into which both ends of the retainer 140 having a C-shaped cross section fit, and a storage recess 108 into which the head of the mounting bolt 150 is stored are formed. The guide rail 100 is disposed over the entire range in the vertical direction where the guide rail 100 is provided.

[0051] -Retainer 140- The retainer 140 is formed by bending a sheet metal member and extends in the vertical direction. Furthermore, as shown in Fig. 11, the cross section of the retainer 140 is C-shaped with the inside in the width direction open, and as described above, both ends of the retainer 140 fit into the recesses 106 formed in the guide rail 100. The retainer 140 is disposed in the vertical direction over the entire range in which the guide rail 100 is provided.

[0052] -Mounting bolt 150- 11, the head of the mounting bolt 150 is disposed in a storage recess 108 formed in the guide rail 100, and the threaded portion of the mounting bolt 150 is inserted into a through-hole (not shown) formed in the retainer 140 and the side frame 22, and is tightened into a weld nut 28 attached to the side frame 22.

[0053] (Effect of overall structure) When the entrance of a warehouse or the like is blocked by the curtain unit 30, and the drive roll 60 shown in FIG. 10 receives rotational force from the motor and rotates in the forward direction (the direction K01 shown in FIG. 10), the rotating gear member 64 sequentially engages the engaging elements 40 that approach in the tangential direction (F01 in the figure) with the engaging recesses 66. Furthermore, the rotating gear member 64 sequentially disengages the engaging elements 40 that were engaged with the engaging recesses 66, and the disengaged engaging elements 40 move away in the tangential direction (F02 in the figure). The rotating gear member 64 also causes the curtain unit 30 to be taken up by the take-up roll 20 (see FIG. 2).

[0054] Then, the portion of curtain unit 30 that is blocking the entrance moves upward while being guided by a pair of guide rails 100 shown in Figure 11. This causes the entrance of the warehouse or the like to be opened by curtain unit 30.

[0055] In contrast, when the entrance of a warehouse or the like is opened by the curtain unit 30 and the drive roll 60 shown in Figure 10 rotates in the negative direction (K02 direction shown in Figure 10) as rotational force is transmitted from the motor, the rotating gear member 64 sequentially engages the engaging elements 40 approaching from the tangential direction (F11 in the figure) with the engaging recesses 66, causing the curtain unit 30 to unwind from the winding roll 20 (see Figure 2).

[0056] Furthermore, the rotating gear member 64 sequentially disengages the engaging elements 40 that were engaged with the engaging recesses 66, and the disengaged engaging elements 40 move away in the tangential direction (F12 in the figure). The rotating gear member 64 also moves the curtain unit 30 downward. As a result, the delivery entrance of the warehouse or the like is blocked by the curtain unit 30.

[0057] (Main part configuration) Next, we will explain the valve 90 attached to the sheet curtain 32. As shown in Figures 1, 12(A), and 13(A), the valve 90 is located in the center of the sheet curtain 32 in the width direction and at the bottom end in the up-down direction.

[0058] 12(A), a hollow portion 32a is formed at the bottom end of the sheet curtain 32 by folding back the bottom end of the sheet curtain 32. In this embodiment, the bottom end portion of the sheet curtain 32 refers to the bottom end portion of the sheet curtain 32 excluding the hollow portion 32a when the curtain unit 30 is blocking the entrance to a warehouse or the like. More specifically, the bottom end portion of the sheet curtain 32 refers to the range from the top end of the hollow portion 32a upward to 2° when the vertical length of the sheet curtain 32 excluding the hollow portion 32a is 10° when the curtain unit 30 is blocking the entrance to a warehouse or the like. If the hollow portion 32a is not formed, the bottom end portion of the sheet curtain 32 refers to the range from the bottom end of the sheet curtain 32 upward to 2° when the vertical length of the sheet curtain 32 is 10° when the curtain unit 30 is blocking the entrance to a warehouse or the like.

[0059] Furthermore, the central portion of the sheet curtain 32 in the width direction is a range of 4 to 6 inches from the end of the sheet curtain 32 in the width direction, assuming that the length of the sheet curtain 32 in the width direction is 10 inches.

[0060] As shown in Figures 1 and 12(A), the valve 90 is attached to the other surface of the sheet curtain 32 in the depth direction, and includes a main body 92, an opening / closing lid 94, and a biasing member (not shown).

[0061] The main body 92 has a cylindrical shape with a widened base end, and the thickness of the main body 92 is constant. Furthermore, a flow path 92a, which is a conical hollow portion, is formed inside the main body 92.

[0062] The opening / closing lid 94 is disk-shaped and is attached to the tip of the main body 92 via a hinge member (not shown). This allows the opening / closing lid 94 to rotate about the axis of the hinge member to open and close the flow path 92a. The opening / closing lid 94 is also biased by a biasing member to a closing position where it closes the flow path 92a.

[0063] (Function of main components) Next, we will mainly explain the action of the sheet curtain 32 and the valve 90 when wind pressure is applied to the sheet curtain 32 from one side in the depth direction while the curtain unit 30 is blocking the entrance to a warehouse or the like.

[0064] When the curtain unit 30 is blocking the entrance of a warehouse or the like and wind pressure is applied to the sheet curtain 32, the movement of both ends of the sheet curtain 32 in the depth direction is restricted, and the sheet curtain 32 expands in a curved shape, as shown by the dotted line in Figure 1.

[0065] When the sheet curtain 32 expands into a curved shape, the engaging elements 40 attached to both ends of the sheet curtain 32 shown in Figure 11 are subjected to a force that moves them inward in the width direction, and the engaging elements 40 try to come out of the engaging portions 100a formed on the guide rail 100.

[0066] Furthermore, the upper end of the sheet curtain 32 is restricted from moving in the depth direction by the gear member 64, while the lower end of the sheet curtain 32 is free to move in the depth direction. Therefore, the amount of bulging of the lower end portion of the sheet curtain 32 in the vertical direction and the central portion of the sheet curtain 32 in the width direction is greater than the amount of bulging of the sheet curtain 32 in other portions (see the two-dot chain line in FIG. 1).

[0067] However, in the sheet shutter 10 according to this embodiment, the valve 90 is attached to the sheet curtain 32 in the portion where the expansion amount becomes large. Therefore, as shown in Figures 12(A)(B) and 13(A)(B), the opening and closing cover 94 of the valve 90 rotates due to wind pressure, and the flow path 92a formed in the main body 92 is opened.

[0068] This weakens the wind pressure on the sheet curtain 32, and inhibits the sheet curtain 32 from inflating. In addition, inhibiting the sheet curtain 32 from inflating inhibits the engaging element 40 from slipping out of the engaged portion 100a formed on the guide rail 100 (see FIG. 11).

[0069] (summary) As explained above, in the sheet shutter 10, the sheet curtain 32 is fitted with a valve 90 having a flow path 92a formed therein that allows air to flow between an internal area of ​​a warehouse or the like and an external area of ​​the warehouse or the like. When wind pressure is applied to the sheet curtain 32 from one side in the depth direction, the wind pressure rotates the opening / closing cover 94 of the valve 90, opening the flow path 92a formed in the main body 92. In this way, when wind pressure is applied to the sheet curtain 32, the sheet curtain 32 can be prevented from expanding.

[0070] Furthermore, in the sheet shutter 10, the opening / closing lid 94 opens the flow path 92a due to wind pressure applied to the sheet curtain 32. This makes it possible to prevent foreign objects and the like from moving through the flow path between an internal area of ​​a warehouse or the like and an external area of ​​the warehouse or the like when no wind pressure is applied.

[0071] Furthermore, in the sheet shutter 10, when wind pressure is applied to the sheet curtain 32, the amount of expansion at the bottom end portion of the sheet curtain 32 in the vertical direction and at the center portion of the sheet curtain 32 in the width direction is greater than the amount of expansion of the sheet curtain 32 in other portions. Here, the valve 90 is disposed in the center portion of the sheet curtain 32 in the width direction and at the bottom end portion in the vertical direction. This makes it possible to effectively suppress expansion of the sheet curtain 32 when wind pressure is applied to the sheet curtain 32, compared to when the valve is disposed at the top end portion of the sheet curtain.

[0072] Second Embodiment Next, an example of a sheet shutter according to a second embodiment of the present disclosure will be described with reference to Fig. 14 and Fig. 15. Note that, with regard to the sheet shutter according to the second embodiment, differences from the sheet shutter according to the first embodiment will be mainly described.

[0073] (composition) As shown in FIG. 14, a sheet shutter 110 according to the second embodiment is provided with a rod 112 that is attached to the sheet curtain 32 and extends in the width direction and has a circular cross section.

[0074] Specifically, the rod 112 extends from one end to the other end in the width direction of the sheet curtain 32. Furthermore, the rod 112 is positioned below the center of the sheet curtain 32 in the vertical direction, and is inserted into a bag portion 130 with a bag-shaped cross section attached to the sheet curtain 32, as shown in Figure 15(A).

[0075] Furthermore, as shown in Figures 14 and 15(A)(B), the valve 90 is positioned in the central part of the sheet curtain 32 in the width direction and in the middle part between the upper end of the sheet curtain 32 and the rod 112 in the vertical direction.

[0076] (action) When the curtain unit 30 is blocking the loading entrance of a warehouse or the like and wind pressure is applied to the sheet curtain 32 from one side in the depth direction, the sheet curtain 32 will expand in a curved shape as shown by the two-dot chain line in Figure 14. Specifically, the amount of expansion at the center of the sheet curtain 32 in the width direction and at the intermediate portion between the upper end of the sheet curtain 32 and the rod 112 in the vertical direction will be greater than the amount of expansion of the sheet curtain 32 in other portions.

[0077] However, a valve 90 is disposed in a portion of the sheet curtain 32 where the amount of inflation increases. Therefore, as shown in Figures 15(A) and 15(B), the opening / closing lid 94 of the valve 90 rotates due to wind pressure, and the flow path 92a formed in the main body 92 is opened.

[0078] This reduces the wind pressure applied to the sheet curtain 32, making it possible to prevent the sheet curtain 32 from expanding.

[0079] Third Embodiment Next, an example of a sheet shutter according to a third embodiment of the present disclosure will be described with reference to Fig. 16 and Fig. 17. Note that, with regard to the sheet shutter according to the third embodiment, differences from the sheet shutter according to the first embodiment will be mainly described.

[0080] (composition) As shown in FIG. 16, in the sheet shutter 210 according to the third embodiment, a valve 290 and a valve 90 are attached to the sheet curtain 32 and are aligned in the vertical direction.

[0081] The valve 290 is disposed at the center in the width direction of the sheet curtain 32 and at the bottom end in the vertical direction. The valve 90 is disposed at the center in the width direction of the sheet curtain 32 and above the valve 290 in the vertical direction.

[0082] 17(A) and 17(B), the valve 290 is larger than the valve 90, and includes a main body 292, an open / close lid 294, and a biasing member (not shown). The main body 292 is cylindrical with a widened base end, and the wall thickness of the main body 292 is constant. Furthermore, a flow path 292a, which is a conical hollow portion, is formed inside the main body 292. The cross-sectional area of ​​the flow path 292a is larger than the cross-sectional area of ​​the flow path 92a.

[0083] The open-close lid 294 is disk-shaped and attached to the tip of the main body 292 via a hinge member (not shown). This allows the open-close lid 294 to rotate about the axis of the hinge member, opening and closing the flow path 292a. The open-close lid 294 is also biased by a biasing member to a closing position where it closes the flow path 292a. Furthermore, the spring constant of the biasing member of the valve 290 is the same as the spring constant of the biasing member of the valve 90.

[0084] (action) When the curtain unit 30 is blocking the entrance to a warehouse or the like and wind pressure is applied to the sheet curtain 32 from one side in the depth direction, the sheet curtain 32 will expand in a curved shape as shown by the two-dot chain line in Figure 16. Specifically, the amount of expansion at the bottom end of the sheet curtain 32 in the vertical direction and at the center of the sheet curtain 32 in the width direction will be greater than the amount of expansion of the sheet curtain 32 in other parts.

[0085] However, the valves 290 and 90 are arranged side by side in the vertical direction in the central portion in the width direction where the expansion amount increases in the sheet curtain 32. Therefore, as shown in Figures 17(A) and 17(B), the open / close lids 94, 294 of the valves 90, 290 rotate due to wind pressure, and the flow paths 92a, 292a formed in the main bodies 92, 292 are opened.

[0086] Here, the flow path cross-sectional area of ​​the flow path 292a of the valve 290 arranged at the lower end portion of the sheet curtain 32, which has a large amount of inflation, is made larger than the flow path cross-sectional area of ​​the flow path 92a of the valve 90 arranged above the valve 290.

[0087] This effectively weakens the wind pressure applied to the sheet curtain 32 compared to when the flow path cross-sectional area of ​​valves arranged in the vertical direction is the same, and effectively prevents the sheet curtain 32 from expanding.

[0088] Although the present disclosure has been described in detail with respect to a specific embodiment, it will be apparent to those skilled in the art that the present disclosure is not limited to such an embodiment and that various other embodiments are possible within the scope of the present disclosure. For example, in the above embodiment, a case where wind pressure is applied to the sheet curtain 32 from one side in the depth direction has been described, but wind pressure may also be applied to the sheet curtain 32 from the other side in the depth direction. However, in this case, the direction in which the valve opens the flow path in the depth direction is reversed.

[0089] Furthermore, although not specifically explained in the above embodiment, when wind pressure is applied to the sheet curtain 32 from both sides in the depth direction, the opening and closing lid of the valve can be made to open on both sides to prevent the sheet curtain 32 from inflating.

[0090] Furthermore, in the first embodiment, the valve 90 is disposed in the center of the width direction of the sheet curtain 32 and at the bottom end in the vertical direction, but it may be disposed in another position. However, if it is disposed in another position, the effect achieved by disposing the valve 90 in the center of the width direction of the sheet curtain 32 and at the bottom end in the vertical direction will not be achieved.

[0091] In the third embodiment, two valves 90, 290 are arranged vertically, but multiple valves may be arranged vertically as long as the cross-sectional area of ​​the flow path of the valve arranged lower is larger than the cross-sectional area of ​​the flow path of the valve arranged upper. [Explanation of symbols]

[0092] 10 Sheet shutter 40 Engagement element 64 Gear parts 66 Engagement recess 90 valves 92a Channel 94 Opening and Closing Lid 100 guide rail 100a Engaged part 110 Sheet Shutter 290 Valves 292a Channel 294 Opening and Closing Lid

Claims

1. a sheet curtain that moves up and down and separates one area from the other area; A plurality of engaging elements are attached to both ends of the sheet curtain in the width direction and are aligned in the moving direction of the sheet curtain; a pair of guide rails extending in the vertical direction while sandwiching the sheet curtain from the width direction, the guide rails having engaged portions with which the engaging elements are engaged so as to be movable in the vertical direction; a valve provided in the sheet curtain and having a flow path formed therein that allows air to flow between the region on one side and the region on the other side; A sheet shutter equipped with:

2. The valve is provided with an opening / closing lid that opens and closes the flow path, The opening / closing cover opens the flow path by wind pressure applied to the sheet curtain. The sheet shutter according to claim 1.

3. A gear member is provided at the upper end portion of the sheet curtain, and has a plurality of engaging recesses arranged in a circumferential direction to engage with the engaging elements, and rotates to sequentially engage the engaging elements with the engaging recesses, thereby moving the sheet curtain in the up and down direction. The valve is disposed at the center of the sheet curtain in the width direction and at the lower end of the sheet curtain in the up-down direction. The sheet shutter according to claim 1 or 2.

4. A gear member is provided at the upper end portion of the sheet curtain, and has a plurality of engaging recesses arranged in a circumferential direction to engage with the engaging elements, and rotates to sequentially engage the engaging elements with the engaging recesses, thereby moving the sheet curtain in the up and down direction. The valves are provided in a plurality in a central portion in the width direction of the sheet curtain and arranged in a vertical direction of the sheet curtain, a flow path cross-sectional area of ​​the flow path of one of the valves arranged below is larger than a flow path cross-sectional area of ​​the flow path of another of the valves arranged above the one of the valves; The sheet shutter according to claim 1 or 2.

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