Shutter device

Abstract

To provide a shutter device capable of suppressing deformation, breakdown and the like of slats in a shutter box.SOLUTION: A shutter device comprises: a shutter curtain formed by connecting a plurality of slats; a winding drum capable of winding up the shutter curtain; and guide rails into which ends of the shutter curtain are inserted. The guide rails have guide walls disposed so as to face each other in a depth direction. A tangent line connecting the outer periphery of the shutter curtain in a state of being wound up by the winding drum and a top edge of the guide wall on the outdoor side inclines at a first angle. An upper slat located on the upper side can rotate to the outdoor side at a second angle larger than the first angle with respect to a lower slat.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present disclosure relates to a shutter device. [Background technology]

[0002] The shutter has a shutter curtain that is connected by fitting the generally arc-shaped curled parts provided above and below each slat rotatably to each other. A shutter curtain is known that has a structure in which it is wound up inwardly on a winding drum in a shutter box provided at the top of the opening of the building material. The shutter curtain is wound up and unwound on the outside of the winding drum, and the shutter box protrudes only slightly from the building material, allowing it to be constructed in a small size.

[0003] During the closing operation, the seat plate at the lower end of the shutter curtain may come into contact with an obstacle. When the shutter curtain comes into contact with an obstacle, the shutter curtain is likely to become loose, bent, or loose around the outer periphery of the winding drum around which it is wound. Patent Document 1 discloses a control method in which a sensor is provided that can detect the occurrence of looseness, bending, or looseness in the shutter curtain, and when a detection signal is output from the sensor, the closing operation of the shutter curtain is temporarily stopped and the shutter curtain is opened from the stopped state. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-190641 A Summary of the Invention [Problem to be solved by the invention]

[0005] The control disclosed in Patent Document 1 is premised on the normal operation of the sensor and shutter curtain. For example, in the case of an electrically operated shutter device, if an abnormality occurs in the motor driving the shutter curtain and the winding drum continues to rotate after the shutter curtain reaches the lower limit position, the slats in the shutter box may move toward the interior, resulting in deformation or damage.

[0006] If the shutter device is manual, when the shutter curtain is closed forcefully, the winding drum will continue to rotate due to inertia even after the shutter curtain has reached the lowest position, and just as in the case of an electric shutter, the slats inside the shutter box will move toward the interior, which may result in deformation or damage.

[0007] The present disclosure has been made in consideration of the above points, and aims to provide a shutter device that can suppress deformation, damage, etc. of slats within the shutter box. [Means for solving the problem]

[0008] A first aspect of the present disclosure is a shutter device comprising: a shutter curtain comprising multiple slats connected together; a take-up drum arranged within a shutter box and capable of winding up the shutter curtain inward; and a guide rail into which the widthwise end of the shutter curtain is inserted, wherein the guide rail has guide walls arranged opposite each other in the projection direction, and in a cross section perpendicular to the widthwise direction, a tangent on the outdoor side connecting the outer periphery of the shutter curtain when it is wound up to its full length on the take-up drum and the upper end of the guide wall on the outdoor side is inclined at a first angle in the vertical direction, and among the slats adjacent to each other vertically, an upper slat located on the upper side can be rotated toward the outdoor side at a second angle greater than the first angle relative to a lower slat located on the lower side. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram illustrating an example of a schematic configuration of a shutter system according to an embodiment of the present invention. [Diagram 2] 2 is a partial cross-sectional view taken along the line II-II in FIG. [Diagram 3] 2 is a partial cross-sectional view taken along the line II-II in FIG. [Figure 4] FIG. 2 is a side view of the slats that make up the shutter curtain. [Diagram 5] 13 is an enlarged view of the fitting portion of the slat when the shutter curtain is closed. FIG. [Figure 6] FIG. 2 is a side view of the upper and lower slats. [Figure 7] 13 is an enlarged view of the fitting portion when the upper slat is rotated at a second angle. FIG. [Figure 8] 11 is an enlarged view of the fitting portion when wound around the winding drum. FIG. [Figure 9] 13 is an enlarged view of the fitting portion when separated from the winding drum. FIG. [Figure 10] 2 is a partial cross-sectional view taken along the line II-II in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the shutter device of the present disclosure will be described with reference to Figures 1 to 10. The following embodiment shows one aspect of the present disclosure, does not limit the disclosure, and can be modified as desired within the scope of the technical ideas of the present disclosure. In addition, in the following drawings, the scale of each structure is different from the actual structure in order to make each configuration easier to understand.

[0011] As shown in FIG. 1, the shutter system 1 includes a shutter device 2 and an operation device 3.

[0012] The shutter device 2 is an electric shutter device that opens or closes an opening 2A such as a window or door of a building. The shutter device 2 includes a shutter curtain 4. The shutter device 2 can open or close the opening 2A by opening or closing the shutter curtain 4 based on an operation signal from an operation device 3.

[0013] The operation device 3 is connected to the shutter device 2, which is the object of operation, via a wired or wireless connection, and is capable of mutual communication with the shutter device 2. The operation device 3 can be operated by a user or an operator. The operation device 3 is, for example, a remote control device, and is equipped with a means for inputting an operation signal to the shutter device 2.

[0014] When a user presses any of the switches on the operation device 3, the operation device 3 outputs to the shutter device 2 an operation signal that is a signal corresponding to the switch.

[0015] For example, the operating device 3 has an open switch SWo, a close switch SWc, and a stop switch SWt. When the open switch SWo is operated, the operating device 3 transmits a first operation signal to the shutter device 2 instructing an opening operation of the shutter curtain 4. When the close switch SWc is operated, the operating device 3 transmits a second operation signal to the shutter device 2 instructing a closing operation of the shutter curtain 4. When the stop switch SWt is operated, the operating device 3 transmits a stop signal to the shutter device 2 instructing to stop the opening operation or closing operation of the shutter curtain 4.

[0016] An example of a schematic configuration of the shutter device 2 according to this embodiment will be described below. As shown in Fig. 1, the shutter device 2 includes a shutter curtain 4, guide rails 5a and 5b, and a shutter box 6.

[0017] An example of the schematic configuration of the shutter box 6 will be described. As shown in Fig. 2, the shutter box 6 is provided on the upper part of the shutter device 2. The shutter box 6 rewinds the shutter curtain 4 when the shutter curtain 4 is closed, and rewinds the shutter curtain 4 inward when the shutter curtain 4 is opened. The shutter box 6 includes a take-up drum 7, a motor 8, and a shutter control device 10. Hereinafter, the width direction of the shutter curtain 4 will be referred to as the "width direction".

[0018] The winding drum 7 is connected to the upper end of the shutter curtain 4 and to a motor 8. The winding drum 7 is cylindrical with an axis extending in the width direction as its center. The winding drum is driven to rotate in forward and reverse directions by the motor 8. The shutter curtain 4 is unwound or wound according to the rotation of the winding drum 7. The shutter curtain 4 wound around the winding drum 7 is accommodated in the shutter box 6.

[0019] The motor 8 is a drive source that drives the winding drum 7 to rotate and open / close the shutter curtain 4. The motor 8 drives the shutter curtain 4 to open / close by a direct current. The motor 8 may be an AC motor that is driven by an alternating current power source. The motor 8 rotates forward, reverse, or stops rotating based on a drive signal from the shutter control device 10.

[0020] The shutter control device 10 transmits and receives information by communicating with the operation device 3. The method of communicating information is not particularly limited, and may be, for example, a wireless communication method such as the short-range wireless communication standard RF4CE (Radio Frequency for Consumer Electronics) or Bluetooth (registered trademark). The shutter control device 10 generates a drive signal according to information from the operation device 3 and outputs the drive signal to the motor 8 to drive or stop the motor 8. The shutter control device 10 is composed of, for example, a microprocessor such as a CPU or MPU, a microcontroller such as an MCU, a storage device, etc., and controls the drive of the motor 8 according to the operation of a switch of the operation device 3.

[0021] As shown in Fig. 1, the guide rails 5a and 5b are provided as a pair at both ends in the width direction of the shutter curtain 4. The guide rails 5a and 5b are provided vertically to the bottom surface. As shown in Fig. 2, the guide rails 5a and 5b have guide walls 15A and 15B, respectively.

[0022] Guide wall 15A is located on the outdoor side in the projection direction and extends in the vertical direction. Guide wall 15B is located on the indoor side in the projection direction and extends in the vertical direction. Guide wall 15A and guide wall 15B are arranged opposite each other in the projection direction across holding space 15C extending in the vertical direction. The shutter curtain 4 is inserted from the inside in the width direction into holding space 15C and held therein. The shutter curtain 4 inserted from the inside in the width direction into holding space 15C is guided in its opening and closing operation by guide wall 15A and guide wall 15B. Guide rail 5a and guide rail 5b regulate the lateral shift of each slat 4a that constitutes the shutter curtain 4.

[0023] The shutter curtain 4 has a plurality of long slats 4a connected in the vertical direction and a baseboard portion 4b provided at the bottom end.

[0024] The baseboard 4b is a long member having a rectangular cross section connected to the lowest slat 4a. The baseboard 4b is formed to protrude so as to contact the slat or shutter box 6 (not shown) when the shutter curtain 4 is in the fully open state at the upper limit position, or to contact the receiving portion 6c provided on the shutter device 2 as shown in FIG.

[0025] When the shutter curtain 4 is in the fully closed state at its lowest position, the baseboard portion 4b comes into contact with the lower frame of the frame body of the shutter device 2 or the floor surface, and when the shutter curtain 4 is in the fully open state, the baseboard portion 4b comes into contact with the lintel or the shutter box 6. The lintel is a parting member for the opening of the shutter device 2 that is formed when the shutter curtain 4 rises, and may be provided at the bottom of the shutter box 6.

[0026] 4, the slat 4a has a bulging portion 30, an inclined portion 31, a protruding portion 34, an upper curled portion 35, and a lower curled portion 36. The protruding portion 34 has a lower inclined portion 32 and an upper inclined portion 33.

[0027] The bulging portion 30 is located at the center of the slat 4a in the vertical direction and has an arc shape that bulges outward toward the outdoor side. In the shutter device 2, for example, if an abnormality occurs in the motor 8 or the like and the shutter curtain 4 reaches the lower limit position and the winding drum 7 continues to rotate, the slat 4a may be elastically deformed in a direction that bulges outward toward the indoor side when it moves inside the shutter box 6 to the indoor side from the position during normal operation, as shown in FIG. 10. In this case, the slat 4a may be destroyed due to the large deformation of the bulging portion 30. Since the bulging portion 30 has an arc shape that bulges outward toward the outdoor side, the elastic restoring force is large, so that the slat 4a is likely to return to the position during normal operation. The radius of curvature of the bulging portion 30 may be at least twice the length of the vertical width, which is the length of the chord of the bulging portion 30 in the cross section.

[0028] As shown in Fig. 4, the upper curled portion 35 is located at the upper end of the slat 4a. The upper curled portion 35 is formed in a generally arc shape. The lower curled portion 36 is located at the lower end of the slat 4a. The lower curled portion 36 is formed in a generally arc shape. The inclined portion 31 is inclined in a direction toward the outdoor side as it moves downward from the lower end of the upper curled portion 35. The lower end of the inclined portion 31 is connected to the upper end of the upper curled portion 35.

[0029] The protruding portion 34 is disposed near the lower curled portion 36. The protruding portion 34 protrudes toward the indoor side. The protruding portion 34 is formed at the intersection of the lower inclined portion 32 and the upper inclined portion 33. The lower inclined portion 32 has an outdoor surface 32a that inclines toward the indoor side as it heads upward from the lower curled portion 36. The upper inclined portion 33 is disposed above the lower inclined portion 32. The upper inclined portion 33 has an outdoor surface 33a that inclines toward the indoor side as it heads downward from the bulging portion 30.

[0030] The bulging portion 30, the inclined portion 31 and the upper inclined portion 33 function to tightly wind the shutter curtain 4 in an arc shape along the outer side of the winding drum 7.

[0031] As shown in Fig. 5, when the upper curl portion 35 of the adjacent slat 4a on the lower side fits to the outside, the lower curl portion 36 connects the adjacent slats 4a in the vertical direction so that they can rotate with each other. Of the adjacent slats 4a on the vertical side, the slat 4a located on the upper side is referred to as the upper slat 71, and the slat 4a located on the lower side is referred to as the lower slat 72. The lower curl portion 36 of the upper slat 71 fits into the upper curl portion 35 of the lower slat 72 from the radially inner side to form the fitting portion 37. The upper slat 71 and the lower slat 72 are relatively rotatable around an axis extending in the width direction of the shutter curtain 4 at the fitting portion 37.

[0032] When the shutter curtain 4 is closed, the upper curl portion 35 of the lower slat 72 contacts the lower curl portion 36 of the upper slat 71 at one point, position P1. Position P1 is the uppermost position on the outer periphery of the fitting portion 37 of the lower curl portion 36. Position P1 is the uppermost position on the inner periphery of the fitting portion 37 of the upper curl portion 35. In one slat 4a, a line segment L connecting position P1 on the upper curl portion 35 and position P1 on the lower curl portion 36 is parallel to the up-down direction when the shutter curtain 4 is closed.

[0033] When the shutter curtain 4 is in a closed state, a gap G is formed between the tip of the upper curl portion 35 and the tip of the lower curl portion 36 which constitute the fitting portion 37, which is much larger than the mutual gaps in other parts of the fitting portion 37. The radius of curvature R of the arcuate surface of the vertical middle and lower parts of the outer surface of the lower curl portion 36 of the fitting portion 37 is larger than the radius of curvature r of the upper arcuate surface. The radius of curvature of the arcuate surface 36a of the lower curl portion 36 is larger than the radius of curvature R of the fitting portion 37. A flat portion 36b is formed on the tip side of the arcuate surface 36a of the lower curl portion 36.

[0034] In a cross section perpendicular to the width direction, an outdoor tangent T connecting the outer circumference of the shutter curtain 4 when the shutter curtain 4 is wound up to its full length on the winding drum 7 and the outdoor upper end of the holding space 15C is inclined at a first angle θ1 with respect to the vertical direction.

[0035] As shown in Fig. 6, the upper slat 71 can rotate to the outdoor side relative to the lower slat 72 at a second angle θ2 centered on the fitting portion 37. The second angle θ2 is an angle at which a line segment L of the upper slat 71 and a line segment L of the lower slat 72 intersect, and is an angle larger than the first angle θ1. When the shutter curtain 4 is wound up around the winding drum 7 in the shutter box 6, the upper slat 71 can rotate to the outdoor side relative to the lower slat 72 at a second angle θ2 larger than the maximum first angle θ1 at which the upper slat 71 rotates to the outdoor side relative to the lower slat 72 at the fitting portion 37 centered on the fitting portion 37.

[0036] Because the upper slat 71 can rotate toward the outdoors relative to the lower slat 72 at a second angle θ2 that is larger than the first angle θ1, deformation, damage, etc. of the slat 4c inside the shutter box 6 can be suppressed even when the slat 4c moves toward the indoors side more than its position during normal operation inside the shutter box 6, as shown in Figure 2, and the upper slat 71 rotates at a large angle toward the outdoors relative to the lower slat 72.

[0037] When the upper slat 71 rotates toward the outdoors at the second angle θ2 around the fitting portion 37 relative to the lower slat 72, the lower curl portion 36 of the upper slat 71 and the upper curl portion 35 of the lower slat 72 come into contact at two or more points, as shown in Fig. 7. The lower curl portion 36 of the upper slat 71 and the upper curl portion 35 of the lower slat 72 come into contact at three points, positions P2, P3, and P4. Position P2 is closer to the tip side than position P1 of the upper curl portion 35 and the lower curl portion 36. Position P4 is near the intersection of the arcuate surface 36a and the flat portion 36b of the lower curl portion 36. Position P3 is between positions P2 and P4 in the circumferential direction. The lower curled portion 36 of the upper slat 71 and the upper curled portion 35 of the lower slat 72 come into contact at two or more points, thereby firmly fixing the state of the upper slat 71 and the lower slat 72 rotated relatively at the second angle θ2.

[0038] As shown in Figure 4, the multiple slats 4a are formed so that the inclination angle α of the surface 32a of the lower inclined portion 32 with respect to the horizontal plane when the shutter curtain 4 is closed and hanging vertically is greater than or equal to the water sliding angle, which varies depending on the material used.

[0039] The falling angle is the angle at which water droplets start to flow down the inclined surface when they are dropped on the inclined surface. The falling angle depends on the material and temperature of the painted surface, but for example, if the painted surface is made of aluminum alloy or steel plate such as iron plate, which is a material for general slats, the falling angle is approximately 50 degrees or more. The inclination angle α of the surface 32a of the lower inclined portion 32 must be greater than the falling angle of water, which varies depending on the material used, such as whether an aluminum alloy or steel plate is used as the base material of the slat 4a, or what paint is used to apply to the slat 4a. If the inclination angle α of the surface 32a of the lower inclined portion 32 is 90 degrees or more, the protrusion 34 will not be formed, so the inclination angle α of the surface 32a of the lower inclined portion 32 must be less than 90 degrees.

[0040] In the fitting portion 37 between the upper curled portion 35 and the lower curled portion 36 connecting the upper slat 71 and the lower slat 72, as shown in FIG. 5, the gap g, which is the gap directly below the position P1 when the shutter curtain 4 is closed, is set to a dimension that draws water into the gap of the fitting portion 37 by capillary action. When the shutter curtain 4 is closed, the gap g that draws water into the gap of the fitting portion 37 is, for example, 0.30 mm or less, more preferably 0.25 mm or less, and even more preferably 0.20 mm or less. If the gap g is narrow, the rotation resistance of the fitting portion 37 increases and manufacturing becomes difficult, so the dimension of the gap g is preferably 0.1 mm or more. The gap G of the fitting portion 37 is set to about 0.6 mm, for example.

[0041] If the inclination angle α of the surface 32a of the lower inclined portion 32 is less than the water fall angle, water accumulates on the surface 32a due to rainfall, and when the shutter curtain 4 is opened, the water is pulled up without flowing down, so that the water is retained on the shutter curtain 4 even when it is wound around the winding drum 7. In the shutter device 2, the inclination angle α of the surface 32a is set to be equal to or greater than the fall angle, so that the water flows down from the surface 32a. In the shutter device 2, the amount of water retained when the shutter curtain 4 is wound around the winding drum 7 is reduced, so that the amount of water splashing into the room when the shutter curtain 4 is closed is reduced.

[0042] In the shutter device 2, the gap g of the fitting portion 37 is set to a dimension that allows water to be drawn into the gap of the fitting portion 37 by capillary action, so that the amount of water held in the fitting portion 37 is reduced, and the amount of water held in the fitting portion 37 when the shutter curtain 4 is wound around the winding drum 7 is also reduced. In the shutter device 2, when the shutter curtain 4 is closed, the water held in the fitting portion 37 is less likely to move due to the capillary action that occurs in the gap, and therefore the amount of water splashing into the room is reduced.

[0043] In the shutter device 2, the inclination angle α of the surface 32a of the lower inclined portion 32 is set to be greater than the water sliding angle, which varies depending on the material used, and the gap g of the fitting portion 37 is set to a dimension that draws water into the fitting portion 37 by capillary action, thereby achieving the effective effects of both configurations, thereby reducing the amount of water retained in the shutter curtain 4 and significantly reducing or eliminating the splashing of water into the room when the shutter curtain 4 is closed.

[0044] In the shutter device 2, a flat portion 35a is provided from the bottom of the portion of the upper curl portion 35 that is fitted into the lower curl portion 36 to the adjacent portion below that, and a flat portion 35a corresponding to the flat portion 35a is also provided near the fitting portion 37 of the lower curl portion 36. Fig. 8 shows the state of the fitting portion 37 when it is wound around the winding drum 7. Fig. 9 shows the state in which the lower slat 72 has left the winding drum 7 and reached the tops of the guide rails 5a, 5b, and has rotated toward the outdoors relative to the upper slat 71.

[0045] As shown in Fig. 5, when the shutter curtain 4 is closed, the gap between the upper curled portion 35 and the lower curled portion 36 at the fitting portion 37 is formed so narrow that capillary action occurs throughout the entire fitting portion, and the amount of water held is small. When the shutter curtain 4 is wound around the take-up drum 7, the gap g at the bottom of the fitting portion between the upper curled portion 35 and the lower curled portion 36 at the fitting portion 37 expands due to the relationship between the radii of curvature r and R, as shown in Fig. 8.

[0046] When the shutter curtain 4 is closed, when the slat 4a reaches the top of the guide rails 5a, 5b, the lower slat 72 rotates toward the outdoors relative to the upper slat 71, narrowing the enlarged gap g, and as shown in Figure 9, the upper curl portion 35 rotates relative to the lower curl portion 36 as indicated by arrow Rc, narrowing the distance between the flat portion 35a and the arcuate surface 36a, so that the water held in the gap g is released to the outdoors and any water remaining in the fitting portion 37 can be released.

[0047] In the shutter device 2, when the shutter curtain 4 is wound up again on the winding drum 7 and opened, almost no water is retained in the fitting portion 37, and water splashing toward the indoor side is suppressed when the shutter curtain 4 is closed again.

[0048] In the shutter device 2, in order to facilitate the relative rotation of the upper curled portion 35 and the lower curled portion 36 at the fitting portion 37, a paint coating having good slip properties and high abrasion resistance is provided on the surface of the base material of the slat 4a.

[0049] The substrate of the slat 4a is, for example, a zinc-based plated steel sheet, and at least one of the outdoor surface and the indoor surface of the substrate has a paint coating layer formed by laminating, from the substrate side, a chemical conversion treatment layer, a primer coating layer and a topcoat coating layer in that order.

[0050] The zinc-based plated steel sheet is not particularly limited in terms of the steel material, and can be appropriately selected depending on the application of the coated steel sheet. In view of the wind pressure resistance required for the shutter curtain 4, the zinc-based plated steel sheet is preferably a general-purpose cold-rolled steel sheet having a thickness of 0.1 to 1.2 mm.

[0051] In zinc-based plated steel sheets, the zinc-based plating is applied not only to the surface on which the paint film is formed, but also to both sides of the steel sheet for the purpose of corrosion resistance and edge rust resistance. If the zinc-based plating is not applied, the corrosion resistance is insufficient. Examples of zinc-based plating include electrolytic zinc plating, zinc-nickel alloy plating, zinc-chromium alloy plating, hot-dip galvanized sheet, alloyed hot-dip galvanized plating, zinc-aluminum alloy plating, etc. From the viewpoints of cost and performance, particularly preferred zinc-based plated steel sheets include hot-dip galvanized steel sheet (Gl), alloyed hot-dip galvanized steel sheet (GA), 5% aluminum-zinc alloy plated steel sheet (GF), 8% aluminum-zinc alloy plated steel sheet, 15% aluminum-zinc alloy plated steel sheet, 55% aluminum-zinc alloy plated steel sheet (GL), 75% aluminum-zinc alloy plated steel sheet, etc. can also be applied to these zinc and aluminum-zinc alloys to which Mg, Mn, Si, Ti, Ni, Co, Mo, Pb, Sn, Cr, La, Ce, Y, Nb, etc. are added.

[0052] The chemical conversion coating layer formed on the zinc-based plating layer is a layer that has been subjected to a known phosphate treatment, chromate treatment, or the like. In terms of cost and adhesion, a chromate-treated layer is preferable. Examples of chromate treatment include electrolytic chromate treatment, coating chromate treatment, and immersion chromate treatment, and coating-type chromate treatment is preferable in terms of the simplicity of the equipment. Resin chromate, in which a resin is mixed in a chromate solution, can also be applied. Examples of resin chromate include a mixture of acrylic-styrene resin and urethane resin to which a chromate compound such as ammonium chromate has been added.

[0053] The undercoat coating layer formed on the chemical conversion coating layer plays the role of a primer layer of a known painted steel plate, and is formed for the purpose of maintaining the adhesion between the steel plate and the topcoat coating layer and improving corrosion resistance. This undercoat coating layer is made of one or more of acrylic resins, epoxy resins, polyester resins, phenolic resins, amide resins, urethane resins, etc. Among them, epoxy resins are preferred from the viewpoint of adhesion.

[0054] The thickness of the undercoat coating layer is preferably in the range of 1 to 10 μm. If the undercoat coating layer is less than 1 μm, the adhesion and corrosion resistance between the topcoat coating layer and the steel sheet are reduced. If the undercoat coating layer is more than 10 μm, no further improvement in adhesion and corrosion resistance is observed, and instead workability is reduced, leading to increased costs due to increased raw material costs.

[0055] It is preferable to add an anti-rust pigment to the undercoat coating layer in order to improve corrosion resistance. The anti-rust paint to be added includes chromium-based, vanadium-based, phosphorus-based, and zinc-based anti-rust pigments, but a general chromium-based anti-rust pigment is used. The most suitable chromium-based anti-rust pigments include strontium chromate, calcium chromate, barium chromate, and zinc chromate, and one or more of them can be used.

[0056] When an anti-rust pigment is added to the undercoat coating layer, the amount of the anti-rust pigment added is preferably 1 to 10% by mass. If the amount is less than 1% by mass, the corrosion resistance is insufficient, and if the amount is more than 30% by mass, the effect of improving the corrosion resistance is not observed, leading to a decrease in processability.

[0057] The topcoat coating layer formed on the undercoat coating layer contains, as essential components, a polyester resin, polytetrafluoroethylene powder, polyethylene wax and nylon beads.

[0058] The polyester resin, which is the resin component of the topcoat coating layer, may be one that has been used as a topcoat paint for coated steel sheets in the past, and is not particularly limited. Examples of polyester resins include those obtained by polymerizing a polyester resin and a crosslinked resin. The polyester resin is obtained by condensation polymerization of a polyhydric alcohol and a polybasic acid. As the polyhydric alcohol, one or more of ethylene glycol, propylene glycol, butylene glycol, 1,5-pentanediol, 1,6-hexanediol, neopentyl glycol, diethylene glycol, triethylene glycol, glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitol, etc. may be used in combination. As the polybasic acid, one or more of maleic acid, fumaric acid, succinic acid, glutaric acid, adipic acid, sebacic acid, orthophthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, etc. may be used in combination. In addition, an acid anhydride such as phthalic anhydride may be used. Examples of the crosslinking resin include melamine acid, blocked isocyanate, epoxy resin, acrylic resin, phenol resin, and xylene resin.

[0059] The polytetrafluoroethylene powder, which is an essential component of the topcoat coating layer, preferably has an average particle size of 0.2 to 40 μm in order to obtain the effects described below.

[0060] The content of polytetrafluoroethylene powder in the topcoat coating layer is 1 to 5 mass%, preferably 1.5 to 4.5 mass%. If the content of polytetrafluoroethylene powder is less than 1 mass%, there is no effect of improving abrasion resistance and scratch resistance, and molding processability is insufficient, while if it exceeds 5 mass%, no further effect of improving abrasion resistance and scratch resistance is observed, and it is not preferable because it causes poor appearance such as foaming of the paint and air bubbles and cissing on the painted surface.

[0061] The polyethylene wax contained in the topcoat coating layer may be a known one, and typically has a softening point of 100 to 144° C. and an average particle size of 5 to 35 μm. The polyethylene wax is added in the form of a solid or diluted with water or a solvent to the coating composition for forming the topcoat coating layer.

[0062] The content of polyethylene wax in the topcoat coating layer is 0.1 to 2% by mass, preferably 0.2 to 1.9% by mass. If the content of polyethylene wax is less than 0.1% by mass, there is no effect of improving abrasion resistance or scratch resistance, and molding processability is insufficient, while if it exceeds 2% by mass, no further effect of improving abrasion resistance or scratch resistance is observed, and it is not preferable because it causes poor appearance such as foaming of the paint and air bubbles and cissing on the painted surface.

[0063] Nylon beads, which are used as an essential component of the topcoat coating layer, are added to simultaneously achieve design and improved abrasion resistance and scratch resistance. If they are not added, high abrasion resistance cannot be obtained when dust adheres, and scratch resistance is also poor. From the viewpoint of design, acrylic beads, urethane beads, glass beads, etc. can be used, but all of them are insufficient in abrasion resistance and moldability, which are essential for coated steel sheets for shutter curtains. Nylon beads are more flexible and have better lubricity than these beads, so they do not damage the coating film they come into contact with and can suppress the occurrence of galling during molding.

[0064] The nylon beads used are preferably made of one or more resins selected from nylon 6, nylon 66, nylon 11, nylon 12, nylon 610, nylon 612, nylon MXD6, and copolymers thereof. The average particle size must be 20 to 60 μm. If the average particle size is less than 20 μm, the abrasion resistance and scratch resistance are insufficient, the beads are embedded in the topcoat coating film, the gloss does not decrease, and sufficient design properties cannot be obtained. If the average particle size is more than 60 μm, the beads tend to fall off the coating film, the abrasion resistance is deteriorated, and the moldability, paintability such as separation of beads, and the appearance such as streaking of the coated surface are significantly deteriorated, which is not preferable.

[0065] The content of nylon beads in the topcoat coating layer is 1 to 20% by mass, preferably 2 to 19% by mass. If the content of nylon beads is less than 1% by mass, not only is the gloss not reduced and the design is insufficient, but the abrasion resistance and scratch resistance are also insufficient. If the content of nylon beads is more than 20% by mass, no further improvement in abrasion resistance and scratch resistance is observed, and molding processability, paintability such as separation of beads, and appearance such as streaks on the painted surface are significantly deteriorated, which is not preferable.

[0066] The thickness of the topcoat coating layer is preferably in the range of 8 to 30 μm. If it is less than 8 μm, the corrosion resistance, abrasion resistance, and designability are reduced, and if it exceeds 30 μm, the appearance of the coating is poor due to the occurrence of popping, etc., and the coating property and productivity are significantly reduced.

[0067] Additives, other resins, and fillers may be added to at least one of the undercoat layer and the topcoat layer that constitute the coating film. Representative examples include rust-preventive pigments (chromium compounds such as chromic anhydride and strontium chromate), surfactants, defoamers, other lubricants (natural waxes, etc.), coloring pigments (titanium oxide, carbon black, etc.), extender pigments (talc, calcium carbonate, etc.), matting agents (silica, etc.), UV absorbers, scratch prevention agents, mildew prevention agents, antibacterial agents, antioxidants, antistatic agents, leveling agents, dispersants, anti-repellent agents, color separation prevention agents, anti-settling agents, inorganic aggregates (glass beads, ceramic beads, glass fibers, silicon carbide, mica, alumina, etc.), and other organic beads (acrylic beads, urethane beads, polyester beads, etc.).

[0068] The steel sheet, which is the substrate, has a coating film including a chemical conversion layer, an undercoat coating layer, and a topcoat coating layer on one or both sides of the zinc-based plated steel sheet, and when the coating film is on one side, the opposite side preferably has a chemical conversion layer, an undercoat coating, and a topcoat coating from the viewpoints of abrasion resistance and corrosion resistance. The chemical conversion layer and undercoat coating on the opposite side are similar to the chemical conversion layer and undercoat coating layer of the coating film, and the topcoat coating layer is preferably a coating film containing polyester resin, polytetrafluoroethylene, and polyethylene wax as components from the viewpoints of abrasion resistance and scratch resistance.

[0069] The method for producing a coated steel sheet may be any method capable of forming a chemical conversion coating layer, an undercoat coating layer, and a topcoat coating layer on the surface of a zinc-based plated steel sheet, and the coated steel sheet may be produced by a method for obtaining a normal coated steel sheet from a steel sheet that has been subjected to a zinc-based plating or chemical conversion treatment by a known method. The method for painting the steel sheet includes known methods such as immersion, spraying, brush coating, roll coater, bar coater, flow coater, air knife, and electrostatic coating. Drying and baking are performed using a hot air drying device, far-infrared heating device, induction heating device, ultraviolet curing device, electron beam curing device, etc., under conditions where the maximum temperature of the steel sheet surface reaches 180 to 260°C, and the baking time is about 20 to 180 seconds.

[0070] In the shutter device 2, of the vertically adjacent slats 4a, the upper slat 71 located on the upper side can rotate toward the outdoor side relative to the lower slat 72 located on the lower side at a second angle θ2 that is greater than the first angle θ1 at which the outdoor tangent T connecting the outer circumference of the shutter curtain 4 when the shutter curtain 4 is wound up to its longest length on the winding drum 7 and the upper end of the outdoor side in the retaining space 15C inclines in the vertical direction.Therefore, even if the slat 4c moves toward the indoor side from its position during normal operation inside the shutter box 6, deformation, damage, etc. of the slat 4c within the shutter box 6 can be suppressed.

[0071] In the shutter device 2, when the upper slat 71 rotates toward the outdoors relative to the lower slat 72, the upper curl portion 35 and the lower curl portion 36 come into contact at two or more points, thereby firmly fixing the state of the upper slat 71 and the lower slat 72 which have rotated relative to each other at the second angle θ2.

[0072] In the shutter device 2, the slats 4a have an arc-shaped bulge portion 30 that bulges toward the outdoors, increasing their elastic restoring force. Therefore, even if the slats 4c move toward the indoor side from their normal operating position inside the shutter box 6, they tend to return to their normal operating position.

[0073] In the shutter device 2, at least one of the outdoor surface and the indoor surface of the base material of the slat 4a has a paint coating layer formed by laminating a chemical treatment layer, an undercoat coating layer and a topcoat coating layer in that order from the base material side, so that the upper curl portion 35 and the lower curl portion 36 have improved sliding properties when they rotate relative to each other at the fitting portion 37, thereby increasing wear resistance.

[0074] In the shutter device 2, the inclination angle α of the lower inclined portion 32 of the protrusion 34 when the shutter curtain 4 is closed is formed to be greater than or equal to the water falling angle, which varies depending on the material used, and since water flows down from the surface 32a, the amount of water retained when the shutter curtain 4 is wound around the winding drum 7 is reduced, thereby reducing the amount of water splashing indoors when the shutter curtain 4 is closed.

[0075] Although the preferred embodiments of the present disclosure have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to the examples. The shapes and combinations of the components shown in the above examples are merely examples, and various modifications can be made based on design requirements, etc., without departing from the spirit of the present disclosure.

[0076] For example, in the shutter device 2 of the embodiment, a configuration including a motor 8 that drives the shutter curtain 4 to open and close has been exemplified, but the present disclosure is not limited to this configuration. The present disclosure is also applicable to a configuration in which the shutter curtain 4 is opened and closed manually. When the shutter curtain 4 is opened and closed manually, by closing the shutter curtain 4 forcefully, the take-up drum 7 rotates by inertia even after the shutter curtain 4 reaches the lower limit position, and even when the slats 4a move to the indoor side within the shutter box 6, deformation, breakage, and the like can be suppressed. [Explanation of symbols]

[0077] 2...shutter device, 4...shutter curtain, 4a, 4c...slats, 5a, 5b...guide rails, 6...shutter box, 7...winding drum, 8...motor, 15A, 15B...guide walls, 15C...retaining space, 30...bulging portion, 31...inclined portion, 32...lower inclined portion, 33...upper inclined portion, 34...projecting portion, 35...upper curled portion, 36...lower curled portion, 37...fitting portion, 71...upper slat, 72...lower slat, θ1...first angle, θ2...second angle

Claims

1. A shutter curtain made of multiple slats connected together, A winding drum is disposed in the shutter box and capable of winding up the shutter curtain inward; A guide rail into which the end of the shutter curtain in the width direction is inserted; Equipped with The guide rail has guide walls arranged opposite each other in a projection direction, In a cross section perpendicular to the width direction, a tangent line on the outdoor side connecting an outer periphery of the shutter curtain when it is wound up to the maximum length on the winding drum and an upper end of the guide wall on the outdoor side is inclined at a first angle with respect to the up-down direction, A shutter device in which, of the slats adjacent to each other in the vertical direction, the upper slat located on the upper side can be rotated toward the outdoors at a second angle greater than the first angle relative to the lower slat located on the lower side.

2. The slats are an upper curl portion located at an upper end and formed in a substantially arc shape; a lower curl portion that is located at the lower end and is formed in a substantially arc shape, and that rotatably connects the vertically adjacent slats to each other when the upper curl portion of the adjacent slat on the lower side is fitted to the outside; having When the upper slat rotates toward the outdoor side relative to the lower slat, the upper curled portion and the lower curled portion come into contact with each other at two or more points. The shutter device of claim 1 .

3. The slats are a protruding portion that is disposed near the lower curl portion and that faces the indoor side as the surface on the outdoor side in the projection direction faces upward, and an upper inclined portion that is disposed above the lower inclined portion and faces the indoor side as the surface on the outdoor side faces downward; an inclined portion that slopes downward from a lower end of the upper curled portion toward the outdoor side; a circular arc-shaped bulging portion that connects the inclined portion and the upper inclined portion and bulges out toward the outdoor side; having The shutter device according to claim 2 .

4. A motor is provided for driving the shutter curtain to open and close. The shutter device of claim 1 .

5. The inclination angle of the lower inclined portion of the protrusion when the shutter curtain is closed is formed to be equal to or greater than the water fall angle, which differs depending on the material used. The shutter device according to claim 3 .

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