Building shutter device

Abstract

To achieve a further increase in wind resistance function of a device which includes a shutter curtain 3 that is provided with a slat 6 connected via an interlock joint section X, and which is provided with a wind-resistant function to prevent the shutter curtain 3 from falling off by engagement of an engagement groove 3a formed in the interlock joint section X with an engagement receiving portion 2d formed in a guide rail 2 when the shutter curtain 3 is bent by a strong wind.SOLUTION: The slat 6 is configured to have a bulging piece 6d formed on a slat body piece 6a, and a third engagement groove 6e that is similar to the engagement groove 3a in engagement condition is formed at the bulging piece 6d.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to the technical field of shutter devices for buildings that are installed at openings such as entrances and exits of buildings. [Background technology]

[0002] Generally, shutter devices are installed for buildings to open and close openings such as entrances and exits of buildings. Such shutter devices are comprised of various components, such as guide rails with a pair of first and second groove side pieces at the front and rear, and a shutter curtain in which adjacent slats at the top and bottom are connected in a series via interlocking joints, and which is guided freely up and down on the guide rails to open and close the opening. In this case, the slat is configured to have a slat main body piece portion that has a vertical width, a first engaging piece portion that extends downward from the slat main body piece portion, and a second engaging piece portion that extends upward, and an interlocking joint is formed by engaging the opposing first and second engaging piece portions of adjacent slats with each other. In such shutter devices, in severe weather conditions with strong winds such as typhoons or heavy snowstorms, the shutter curtain when fully closed may bend in the indoor / outdoor direction (front / back direction) when hit by the strong wind, and if the amount of bending becomes too great, there is a risk that the edge of the shutter curtain may come loose from the guide rail. Therefore, an engaging receiving portion is provided on the first groove side piece on one side of the guide rail in the front-to-rear direction, and an engaging groove portion is formed in the interlock connection portion on the first groove side piece side, so that when the shutter curtain is bent by strong winds, the engaging groove portion engages (locks) with the engaging receiving portion, thereby preventing the shutter curtain from slipping out of the guide rail when bent by strong winds.In this way, a shutter device with wind resistance is provided (see, for example, Patent Document 1), and today it is effectively used as a shutter device with added wind resistance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2023-125085 Summary of the Invention [Problem to be solved by the invention]

[0004] In such shutter devices, the interlock connection portion is formed by connecting the opposing first and second engagement pieces of adjacent slats, and the engagement groove portion formed in the interlock connection portion is formed by the first and second engagement grooves provided in the first and second engagement pieces.However, with the increasing size of typhoons in recent years, the winds that shutter curtains are exposed to tend to become more severe, and as a result, there is a demand to further improve the wind resistance of shutter devices. The interlock coupling portion is generally configured such that the first engaging piece portion is arranged on the side closest to the engaging receiving portion (near) and the second engaging piece portion is arranged on the side away from the engaging receiving portion (far). When configured in this manner, the second engaging groove formed in the second engaging piece portion is a shallower groove than the first engaging groove formed in the first engaging piece portion, and as a result, the engaging force of the shallow second engaging groove with respect to the engaging receiving portion is weaker than the engaging force of the deep first engaging groove. In order to reinforce the engagement force of the engagement groove with the engagement receiving portion configured in this way and improve wind resistance, it has been proposed to make the engagement groove deeper. However, if the engagement groove is made deeper, the thickness of the interlocking connection portion of the first and second engagement pieces will be thin, which will in turn reduce the strength of the interlocking connection portion itself. There are therefore limitations to making the engagement groove deeper unnecessarily, making it difficult to adopt. These are the issues that the present invention aims to solve. [Means for solving the problem]

[0005] The present invention has been made in view of the above-mentioned circumstances and with the aim of solving these problems, and the invention of claim 1 comprises a guide rail provided at an opening such as a doorway, which is provided with a groove bottom piece and first and second front and rear groove side pieces, and a shutter curtain in which adjacent slats on the top and bottom are connected in series via interlocking joints and which is fitted into the guide rail so as to be able to move up and down to open and close the opening, and in which the shutter curtain is prevented from coming off the guide rail when it is deflected in the front and rear directions by wind pressure by an engaging receiving part provided at the first groove side piece and an engaging groove part provided at the interlocking joint. This building shutter device is configured so that the interlock connection is performed by engaging with each other, and the interlock connection portion is formed by engaging with each other a first engaging piece portion that extends downward from the slat main body piece portion that constitutes the slat and a second engaging piece portion that extends upward, and the engaging groove portion is formed by first and second engaging grooves provided in the first and second engaging piece portions.In this building shutter device, a bulging piece portion that bulges toward the first groove side piece portion is formed on the slat main body piece portion, and a third engaging groove is formed on the bulging piece portion that engages with the engaging receiving portion when the shutter curtain is bent by wind pressure. The invention of claim 2 is a shutter device for buildings according to claim 1, characterized in that the bulging piece portion is provided at a position biased toward the second engagement piece portion of the slat main body piece. The invention of claim 3 is a shutter device for a building as described in claim 1, characterized in that the third engagement groove is formed so that the groove bottom position relative to the shutter core is approximately the same as the groove bottom position of the engagement groove portion. The invention of claim 4 is a shutter device for buildings as described in claim 2, characterized in that the bulging piece portion bulges in a mountain shape toward the engagement receiving portion in an inclined state continuing from the second engagement piece portion, and the third engagement groove is formed so as to extend from the top of the bulging piece portion to both bottom portions spanning the top. The invention of claim 5 is a shutter device for a building as described in claim 1, characterized in that the shutter curtain has anti-slip portions formed on both left and right end edges of the interlock connection portion, thereby restricting relative left-right movement between adjacent slats, the first, second and third engagement grooves are formed with the same left-right width and at the same left-right position, the first and second engagement piece portions have first and second engagement end portions formed from the first and second engagement grooves to the anti-slip portions, and the bulging piece portion has a third engagement end portion formed from the third engagement groove to the slat edge. The invention of claim 6 is a shutter device for buildings described in claim 5, characterized in that the second groove side piece has a contact receiving portion that protrudes from a portion closer to the groove bottom piece than the engagement receiving portion toward the first groove side piece, and when the shutter curtain is bent toward the first groove side piece and the engagement groove and the third engagement groove are engaged with the engagement receiving portion, it abuts and supports the curtain surface of the second groove side piece side of the shutter curtain when it is in a wind-resistant position where the curtain surface of the second groove side piece side is abutting the abutment receiving portion, and the first and second engagement end portions are set to a length such that the corresponding receiving portion is located within the left and right width of the first and second engagement end portions when it is in a wind-resistant position where the curtain surface of the second groove side piece side is abutting the abutment receiving portion. The invention of claim 7 is a shutter device for a building as described in claim 6, characterized in that the left and right outer edge portions of the first and second engagement end portions are positioned left and right outward from the abutment receiving portion when the shutter curtain is bent and in a wind-resistant position in which the engagement groove portion and the third engagement groove are engaged with the engagement receiving portion. The invention of claim 8 is a shutter device for buildings as described in claim 6, characterized in that the first and second engagement ends are set to a length longer than half the length from the outer left-right edge of the engagement groove to the left-right edge of the slat. [Effects of the Invention]

[0006] By adopting the invention of claim 1, in a shutter device installed at an opening such as a doorway, a shutter curtain is formed by connecting adjacent slats above and below via an interlocking joint, and a bulging piece portion that bulges toward the first groove side piece portion is formed on the slat main body piece portion of the slat, and a third engagement groove is formed on the bulging piece portion that engages with the engagement receiving portion when the shutter curtain is bent by wind pressure.As a result, the wind resistance effect of the shutter curtain can be exerted not only by the engagement groove portion formed in the interlocking joint portion but also by the third engagement groove formed on the bulging piece portion formed on the slat main body piece portion, thereby achieving a high wind resistance effect. By adopting the invention of claim 2, the bulging piece portion is provided at a position biased toward the second engaging piece portion of the slat main body piece, and as a result, the third engaging groove formed in the slat main body piece to exhibit wind resistance is biased toward the second engaging piece portion, which has weaker engagement with the engaging receiving portion, thereby compensating for the weak wind resistance ability and enabling the exhibiting of a wind resistance function with balanced strength. By adopting the invention of claim 3, the third engagement groove is formed so that the groove bottom position relative to the shutter core is approximately the same as the groove bottom position of the engagement groove portion, resulting in the third engagement groove being able to exert its wind resistance by engaging in the same state as the engagement groove portion, thereby improving the wind resistance of the shutter curtain. By adopting the invention of claim 4, the bulging piece portion bulges in a mountain shape toward the engagement receiving portion at an angle continuing from the second engaging piece portion, and the third engaging groove is formed so as to extend from the top of the bulging piece portion to both bottom portions spanning the top, thereby ensuring that the wind-resistant ability of the third engaging groove is exerted in the slat main body piece portion. By adopting the invention of claim 5, in a shutter curtain having a slippage prevention portion formed to restrict the relative left-right movement of the slats, the first, second and third engagement grooves provided to exhibit wind resistance are formed with the same left-right width and at the same left-right position, and the first and second engagement piece portions are formed with first and second engagement end portions that extend from the first and second engagement grooves to the slippage prevention portion, and the bulging piece portion is formed with a long third engagement end portion that extends to the edge of the slat.As a result, when the shutter curtain is bent, the wind resistance force is received not only by the first and second engagement end portions but also by the long third engagement end portion, thereby improving wind resistance. By adopting the inventions of claims 6, 7 and 8, when the shutter curtain is bent toward the first groove side piece and the engaging groove portion and the third engaging groove are engaged with the engaging receiving portions, a contact receiving portion is formed to abut and support the curtain surface of the second groove side piece of the shutter curtain, and the first and second engaging ends are set in length so that when the curtain surface of the second groove side piece is in wind-resistant position and abuts the contact receiving portion, the corresponding receiving portion is located within the left and right width of the first and second engaging ends, or the left and right outer edge portions of the first and second engaging ends are located left and right outward from the contact receiving portions when the shutter curtain is bent and the engaging groove portion and the third engaging groove are engaged with the engaging receiving portions, or the first and second engaging ends are set in length to be longer than half the length from the left and right outer edge portions of the engaging groove portion to the left and right edge portions of the slat, which results in increased strength of the left and right outer parts than the first, second and third engaging grooves, contributing to improved wind resistance. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. [Figure 2] FIG. 10 is a horizontal cross-sectional view of the guide rail portion in a normal position. [Figure 3] FIG. 2 is a front view of the left and right edge portions of the shutter curtain. [Figure 4] 1A and 1B are longitudinal cross-sectional views of the engagement groove portion of the shutter curtain and the slippage prevention portion. [Figure 5]10A and 10B are a front view and a vertical cross-sectional view of the engagement groove portion of the shutter curtain. [Figure 6] 10(A) and 10(B) are a front view and a longitudinal cross-sectional view of the anti-slip portion of the shutter curtain. [Figure 7] (A)(B)(C) are a plan view, a front view, and a bottom view of the edge of the slat before it is assembled into a shutter curtain. [Figure 8] (A), (B), and (C) are cross-sectional views taken along lines AA, BB, and CC in FIG. [Figure 9] (A)(B)(C) are a plan view, a front view, and a bottom view of the edge of the slat after it has been assembled into a shutter curtain. [Figure 10] 10(A) and 10(B) are a DD end view and a cross-sectional view of FIG. 9. [Figure 11] (A) and (B) are horizontal cross-sectional views of the guide rail portion showing the state in which the shutter curtain is bent toward the inside and outside of the room in a wind-resistant position. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a shutter device for a building, which is attached to an opening E such as an entrance or exit of a building, such as a building or a residence, and is configured using various components and devices, such as guide rails 2 provided on both the left and right sides of the opening E, a shutter curtain 3 that opens and closes the opening E by being guided up and down by the guide rails 2, a winding body (winding wheel, winding drum) 4 that is disposed on a ceiling H above the opening E and around which the shutter curtain 3 is wound, and an electric opening / closing device 5 that rotates the winding body 4 forward and backward to wind and unwind the shutter curtain 3, all of which are conventional.

[0009] The guide rail 2 has a main body formed using thick steel material, and is provided with a groove bottom piece 2a, a first groove side piece 2b on the outdoor side on one side in the front-to-back direction (indoor-to-outdoor direction), and a second groove side piece 2c on the indoor side on the other side, thereby forming a concave groove-shaped guide groove G. The first groove side piece 2b is long and extends to the opening edge of the guide groove G, while the second groove side piece 2c is provided with a short groove bottom half 2ca that is integrally formed as the rail main body from the groove side bottom 2a to its middle, and an opening half 2cc that is formed by bending a thin plate from the tip edge 2cb of the groove bottom half 2ca to supplement the short portion (shorter portion) of one of the first groove side pieces 2b. The first groove side piece 2b has an engagement receiving portion 2d (described later) formed in a protruding shape facing the left-right middle portion of the opening side half 2cc toward the opening side half 2cc of the second groove side piece 2c. In contrast, the second groove side piece 2c extends toward the first groove side piece 2b with the tip edge 2cb of the groove bottom side half 2ca biased toward the groove bottom piece 2a more than the engagement receiving portion 2d of the first groove side piece 2b, and the opening side half 2cc is formed while maintaining this extension width, so that the guide groove G is configured like a dovetail groove with the opening side half narrow and the back half of the groove wider toward the second groove side piece 2c.

[0010] On the other hand, the shutter curtain 3 is constructed by connecting multiple slats 6 in a series in the vertical direction, and each slat 6 is constructed to have a slat main body piece 6a that is bent (curved) in a wave-like shape with a width in the vertical direction, a lower first engaging piece 6b extending downward from the slat main body piece 6a, and an upper second engaging piece 6c extending upward. The shutter curtain 3 is constructed by connecting the first and second engagement pieces 6b, 6c of the slats 6 adjacent to each other in the vertical direction in a continuous manner via interlock joints X that join the first and second engagement pieces 6b, 6c.

[0011] To explain the structure of the slat 6 in more detail, the wave-shaped slat main body piece 6a is basically biased toward the second groove side piece (indoor side) 2c side relative to the shutter core Y of the shutter curtain 3 described later, but the upper end portion where the second engagement piece 6c extends upward has a bulging piece 6d formed thereon that bulges (protrudes) toward the first groove side piece (outdoor side) 2b side. The bulging piece portion 6d is formed in a mountain shape with an apex 6da that is closely opposed to the first groove side piece portion 2b and upper and lower bottom portions 6db, 6dc that expand upward and downward from the apex 6da, and the second engaging piece portion 6c extends and is formed continuing from the upper bottom portion 6db, so that the bulging piece portion 6d is formed on the slat main body piece portion 6a in a state biased toward the second engaging piece portion 6c of the slat main body piece portion 6a, in other words, adjacent to the second engaging piece portion 6c.

[0012] On the other hand, the upper second engagement piece 6c continuing from the bulge piece 6d is an upper extending piece 6ca that extends upward with its upper bottom portion 6db inclined toward the second groove side piece 2c side, and is provided with an engagement main body piece 6cb that is bent (curved) upward from the upper end of the upper extending piece 6ca, and a tip side piece 6cc that is bent (curved) downward from the upper end of the engagement main body piece 6cb toward the first groove side piece 2b side, thereby forming a bay groove shape that is open on the lower side and on the first groove side piece 2b side.

[0013] In contrast, the lower first engaging piece 6b is configured to have a bay groove shape with an opening on the upper side and on the second groove side piece 2c side, by comprising a lower extending piece 6ba that extends downward from the lower end of the slat main body piece 6a in an inclined state biased toward the first groove side piece 2b, an engaging main body piece 6bb that is bent (curved) downward from the tip of the lower extending piece 6ba, and a tip side piece 6bc that is bent (curved) upward from the lower end of the engaging main body piece 6bb in a folded manner facing the second groove side piece 2c side.

[0014] The interlock connection X connecting the first and second engagement pieces 6b, 6c configured in this manner is engaged in such a manner that the engagement main body piece 6bb of the first engagement piece 6b is closely opposed to the first groove side piece 2b, the tip side piece 6bc of the first engagement piece 6b is arranged between the engagement main body piece 6cb and the tip side piece 6cc of the second engagement piece 6c, the tip side piece 6cc of the second engagement piece 6c is arranged between the engagement main body piece 6bb and the tip side piece 6bc of the first engagement piece 6b, and the tip side piece 6cc of the second engagement piece 6c is in contact with the corner portion 6bd between the engagement main body piece 6bb and the tip side piece 6bc of the first engagement piece 6b.The slats 6 connected via such interlock connection X are connected so as to be able to swing freely relative to each other in the front-to-rear direction, thereby forming the shutter curtain 3. The shutter curtain 3 is formed by connecting adjacent slats 6 in a series via the interlocking joints X, and the shutter core Y of the formed shutter curtain 3 is generally defined as the line portion where the most load is applied to the interlocking joints X when the shutter curtain 3 is in a hanging (closed) position.In this embodiment, the shutter core Y is defined as a line passing through the contact point portion where the tip side piece 6cc of the second engaging piece 6c abuts and is supported by the corner portion 6bf between the engaging main body piece 6bb and the tip side piece 6bc of the first engaging piece 6b, as described above.

[0015] Furthermore, the shutter curtain 3 of this embodiment is provided with anti-slip portions 7 formed by crimping the left and right end edges of the slats 6 to prevent adjacent slats 6 from moving relative to each other in the left-right direction (to prevent misalignment). The slip prevention portion 7 is composed of a notched groove 7a cut out and formed in the left and right edge portions of the second engagement piece portion 6c that are laterally inward of the left and right slat edge 6aa, a locking piece portion 7b (see Figure 5) formed by bending the portion 7bc extending from the left and right outer edge of the notched groove 7a to the slat edge 6aa toward the first groove side piece portion 2b after the slats 6 are interlocked together, and a notched groove portion 7c formed from a position opposite the notched groove 7a of the first engagement piece portion 6b to the left and right edge of the slat 6. In the shutter curtain 3 connected by the interlock connection portion X, when adjacent slats 6 attempt to shift left or right, the locking piece portion 7b abuts against the inner left-right edge 7ca of the cutout groove portion 7c, creating a crimped state to prevent shifting (regulate shifting), and in this way a shift prevention portion 7 is formed that regulates left-right movement of adjacent slats 6.

[0016] In the shutter device 1 configured in this manner, the interlock coupling portion X is formed with an engagement groove portion 3a that engages with the engagement receiving portion 2d provided on the first groove side piece portion 2b to prevent the shutter curtain 3 from slipping off the guide rail 2 when the shutter curtain 3 is bent in the front-to-rear direction due to strong winds, and the engagement groove portion 3a is composed of first and second engagement grooves 6bd, 6cd formed so as to overlap with each other in the first and second engagement piece portions 6b, 6c of the slat 6. In this case, the fitting groove portion 3a is configured so that the groove bottom edge 3aa is formed in a state where it extends from the outdoor curtain surface 3c of the shutter curtain 3 beyond the shutter core Y. In other words, the first and second engagement grooves 6bd, 6cd that constitute the engagement groove portion 3a are configured to be at the same position in the left-right direction and have the same groove depth when the engagement groove portion 3a is viewed in a plane, and the engagement groove portion 3a is formed in this way. The engagement groove portion 3a is configured with a width in the left-right direction so that when the shutter curtain 3 is in its normal (usual) position without deflection, the engagement receiving portion 2d fits in a loose state positioned in the left-right intermediate position between the left-right outer edge portion 3ab and the inner edge portion 3ac, and in this normal position, the tip edge 2da of the engagement receiving portion 2d is closely opposed to the groove bottom edge 3aa of the engagement groove portion 3a.By configuring it in this manner, the vertical trajectory Z of the tip edge 2da of the engagement receiving portion 2d is set to be deeply fitted in a state closely opposed to the groove bottom edge 3aa not only in the first and second engagement grooves 6bd and 6cd, but also in the third engagement groove 6e, as shown in Figure 5(B), for example.

[0017] When the shutter curtain 3 is in this normal position and is hit by a strong wind, it will bend in the indoor / outdoor direction. When the shutter curtain 3 is bent in the indoor direction (see Figure 11(A)), the left and right edge portions of the shutter curtain 3 that are fitted into the guide rail 2 will have the engagement receiving portion 2d abutting against the left and right outer edge portion 3ab of the engagement groove portion 3a while maintaining the deep fitting state, and the indoor curtain surface 3b of the shutter curtain 3 will abut against the opening edge portion 2cd of the second groove side piece portion 2c, and the outdoor side end 3cb of the left and right outer edge 3ca of the shutter curtain will abut against the first groove side piece portion 2b, thereby assuming a windproof position. In contrast, when the shutter curtain 3 is bent toward the outdoors (see Figure 11 (B)), the left and right edge portions of the shutter curtain 3 that are fitted into the guide rail 2 abut against the left and right outer edge portions 3ab of the engagement groove portions 3a, with the engagement receiving portions 2d abutting while maintaining a deep fitting state, the outdoor curtain surface 3c of the shutter curtain 3 abuts against the opening edge portion 2ba of the first groove side piece portion 2b, and the indoor curtain surface 3b, which is in the left and right inner portion of the left and right outer edge portions 3ca of the shutter curtain 3, abuts against the tip edge of the tip edge portion 2cb of the second groove side piece groove bottom half portion 2ca as the abutment receiving portion 2ce, thereby assuming a wind-resistant posture.

[0018] In the shutter device 1 configured in this manner, a third engagement groove 6e is formed in the bulging piece portion 6d as a configuration for reinforcing the wind resistance function when the shutter curtain 3 is bent by a strong wind. The third engagement groove 6e is formed so as to straddle the top 6da of the bulging piece portion 6d and reach both the upper and lower bottom portions 6db, 6bc, and is formed in the bulging piece portion 6d so as to have the same conditions as the engagement groove portions (first and second engagement grooves 6bd, 6cd) 3a, i.e., the same left-right position, left-right width, and groove bottom position relative to the shutter core Y. As a result, when the shutter curtain 3 is in its normal position, the engagement receiving portion 2d is located at the middle position in the left-right direction of the third engagement groove 6e, and when the shutter curtain 3 is exposed to a strong wind and bends in the indoor / outdoor direction, assuming any of the windproof positions described above, the engagement receiving portion 2d assumes a windproof position in which it abuts against the outer left-right edge portion 6ea of ​​the third engagement groove 6e, thereby reinforcing the windproof function.

[0019] In this embodiment of the present invention, the following considerations are further taken into account in order to improve the windproof function of the shutter curtain 3. As described above, the shutter curtain 3 has slippage prevention portions 7 formed at both left and right edge portions of the interlock joint portion X, thereby restricting the relative left-right movement of the adjacent upper and lower slats 6. By forming the slippage prevention portions 7 in this manner, the first engagement piece 6b has a first engagement end 6be formed between the first engagement groove 6bd and the notched groove 7c with the first engagement piece 6b remaining as it is, and the second engagement piece 6c has a second engagement end 6ce formed between the second engagement groove 6cd and the notched groove 7a with the second engagement piece 6c remaining as it is.

[0020] In the shutter device 1 of the present embodiment configured as above, the following considerations are taken into account to further improve the windbreak (wind resistance) function. The first and second engagement ends 6be, 6ce are configured to restrict left and right displacement by abutting the left and right inner end 7ba of the locking piece portion 7b against the left and right outer end 7ca of the first engagement end 6be. Therefore, the length of the first engagement end 6be (H1: for example, 34 mm) is set to be longer than the length of the second engagement end 6ce (H2: for example, 30 mm) (H1>H2). However, the lengths H1, H2 of the first and second engagement ends 6be, 6ce are also set to be longer than the length (H3: for example, 29 mm) of the engagement groove portions (first and second engagement grooves 6bd, 6cd) 3a (H3

[0021] Furthermore, as mentioned above, in this device, the shutter curtain 3 is not only in its normal unbent position, but also in a wind-resistant position in which it is bent in the forward and backward directions by strong winds and the engagement groove portion 3a and the third engagement groove 6e engage with the engagement receiving portion 2d formed on the guide rail 2. When the shutter curtain 3 is bent outdoors (see Figure 11(B)), the abutment receiving portion 2ce against which the indoor curtain surface 3b of the shutter curtain 3 abuts is located within the left-right width of the first and second engagement end portions 6be, 6ce. In other words, the lengths of the first and second engagement end portions 6be, 6ce are set so that the left-right outer edge portions of the first and second engagement end portions 6be, 6ce are located outward in the left-right direction from the abutment receiving portion 2ce when the shutter curtain 3 is bent outdoors and in a wind-resistant position in which the engagement groove portion 3a and the third engagement groove 6e engage with the engagement receiving portion 2d. As a result, when the shutter curtain 3 is bent toward the outdoors, the shutter curtain 3 is not affected by the reduction in strength caused by the formation of the cutout groove 7a, as would occur if the indoor curtain surface 3b abutted against the abutment receiving portion 2ce at a position outside in the left-right direction from the portion where the cutout groove 7a of the slippage prevention portion 7 is formed.

[0022] ​Furthermore, the lengths H1 and H2 of the first and second engagement ends 6be and 6ce are set to be longer than half the length H4 of the third engagement end 6dd from the outer left-right edge 3ab of the engagement groove 3a to the left-right edge 3ca of the slat (H1, H2 > H4 / 2).As a result, when the shutter curtain is bent indoors and the outdoor edge 3ca of the outdoor curtain surface 3c of the shutter curtain 3 is in a wind-resistant position where it is abutted and supported by the first groove side piece 2b, the portion where the strength of the slat 6 is reduced due to the formation of the cutout groove 7a in the slippage prevention portion 7 is close to the outdoor edge 3ca of the outdoor curtain surface 3c, which is the abutment support point for the first groove side piece 2b.This prevents the wind resistance at the left-right edge of the slat 6 from decreasing, as would occur if the cutout groove 7a were formed on the other hand closer to the engagement groove 3a.

[0023] In the present embodiment configured as described above, the shutter curtain 3 provided in the shutter device 1 erected at an opening E such as a doorway is formed by connecting adjacent slats 6 at the top and bottom via the interlocking joint X. In this case, a bulging piece 6d that bulges toward the first groove side piece 2b of the guide rail 2 is formed on the slat main body piece 6a of the slat 6, and a third engagement groove 6e is formed on the bulging piece 6d to engage with the engagement receiving portion 2d provided on the first groove side piece 2b when the shutter curtain 3 is bent by a strong wind. As a result, the wind resistance of the shutter curtain 3 can be exerted not only by the engagement groove 3a formed in the interlocking joint X, but also by the engagement of the third engagement groove 6e formed on the bulging piece 6d provided on the slat main body piece 6a with the engagement receiving portion 2d, thereby achieving a high wind resistance effect.

[0024] Furthermore, in this case, the bulging piece 6d is provided at a position biased toward the second engaging piece 6c of the slat main body piece 6a, and as a result, the third engaging groove 6e formed in the slat main body piece 6a to exert wind resistance is biased toward the second engaging piece 6c, which has weaker engagement with the engaging receiving portion 2d, thereby compensating for the weak wind resistance ability and allowing the slat 6 to exert balanced wind resistance function at the top and bottom. Furthermore, the third engagement groove 6e is formed so that the groove bottom position relative to the shutter core Y is approximately the same as the groove bottom position of the engagement groove portion 3a formed in the interlock connection portion X, and as a result, the third engagement groove 6e engages with the engagement groove portion 3a under approximately the same conditions, thereby demonstrating high wind resistance and improving the wind resistance of the shutter curtain.

[0025] More specifically, the bulging piece 6d formed on the slat main body piece 6a bulges in a mountain shape toward the engagement receiving portion 2d of the guide rail 2 in an inclined state continuing from the second engagement piece 6c, and the third engagement groove 6e is formed so as to extend from the top 6da of the bulging piece 6d to both the upper and lower bottom portions 6db, 6bc across the top 6da, resulting in a deep groove that ensures that the third engagement groove 6e in the slat main body piece 6a exerts its wind resistance capacity.

[0026] In addition, the interlock connection portion X is formed with a slippage prevention portion 7 for restricting the relative lateral movement of adjacent slats 6, while the first, second and third engagement grooves 6bd, 6cd and 6e, which are provided to demonstrate the wind resistance, are formed with the same lateral width and at the same lateral position, and the first and second engagement piece portions 6b and 6c have first and second engagement ends 6be and 6ce formed between the first and second engagement grooves 6bd and 6cd and the slippage prevention portion 7, but the bulging piece portion 6d of the third engagement groove 6e becomes the third engagement end 6dd and is long enough to reach the slat edge 6aa.As a result, when the shutter curtain bends and the first, second and third engagement grooves 6bd, 6cd and 6e engage with the engagement receiving portion 2d, the wind resistance force is borne not only by the first and second engagement ends 6be and 6ce but also by the long third engagement end 6dd which reaches the slat edge 6aa, thereby improving the wind resistance.

[0027] Furthermore, in this case, the left and right width (left and right groove width, left and right groove length) H3 of the first and second engagement grooves 6bd, 6cd is set narrower than the left and right widths H1, H2 of the first and second engagement end portions 6be, 6ce, and as a result, the first and second engagement end portions 6be, 6ce, which will be subjected to wind force, can be made longer, thereby improving wind resistance.

[0028] Furthermore, in this device, when the shutter curtain 3 is hit by a strong wind and bends toward the outdoors, which is the side of the first groove side piece 2b, and assumes a wind-resistant position in which the engagement groove portion 3a and the third engagement groove 6e engage with the engagement receiving portion 2d, the indoor curtain surface 3b, which is the side of the second groove side piece 2c of the shutter curtain 3, is abutted and supported by the abutment receiving portion 2ce provided on the second groove side piece 2c.In this abutment support state, the abutment receiving portion 2ce is set to a length such that it abuts against the first and second engagement end portions 6be, 6ce at a position more inward in the left-right direction than the cutout groove 7a of the slippage prevention portion 7.As a result, the first and second engagement end portions 6be, 6ce that are abutted and supported by the abutment receiving portion 2ce do not have the cutout groove portion 7a, so a strong abutment support is provided, which contributes to improving wind resistance. This also means that when the shutter curtain 3 is exposed to strong winds and bends outdoors, with the engagement groove portion 3a and the third engagement groove 6e engaging with the engagement receiving portion 2d in a wind-resistant position, the first and second engagement end portions 6be, 6ce are positioned further outward in the left-right direction than the abutment receiving portion 2ce, and even when configured in this manner, this can contribute to improving wind resistance.

[0029] Furthermore, in this device, the lengths H1 and H2 of the first and second engagement ends 6be and 6ce are set to be longer than half the length H4 from the outer left-right edge 3ab of the engagement groove portion 3a to the left-right edge 6aa of the slat 6.As a result, when the shutter curtain 3 is hit by a strong wind, it bends toward the interior of the room and assumes a wind-resistant position, and when the slat 6 is subjected to a load with the corner portion of the slat edge 6aa abutting the first groove side piece 2b on the first groove side piece 2b side as a fulcrum, the load received by the cutout groove portion 7a, which is weaker in strength, is reduced due to the principle of leverage, thereby contributing to improved wind resistance. [Industrial Applicability]

[0030] The present invention can be used as a shutter device for a building that is attached to an opening such as an entrance or exit of a building. [Explanation of symbols]

[0031] 1. Shutter device 2 guide rails 2b First groove side piece 2c Second groove side piece 2ce contact receiving part 2d Engagement receiving part 2da Tip edge of engagement receiving part 3. Shutter Curtain 3a Engagement groove 3b Indoor curtain side 3c Outdoor curtain side 3ca left and right outer edges 6 slats 6a Slat body part 6aa slat edge 6b First engaging piece 6bd First engagement groove 6be First engaging end 6c Second engagement piece 6cd Second engagement groove 6ce Second engagement end 6d bulging piece 6da top 6db, 6dc hem 6dd Third engagement end 6e Third engagement groove 7 Anti-slip part 7a Notched groove 7b locking piece E Opening X Interlocking joint Z Trajectory of the tip edge of the engagement receiver

Claims

1. A guide rail is provided at an opening such as a doorway, and has a groove bottom piece and first and second groove side pieces at the front and rear; and a shutter curtain in which adjacent slats at the top and bottom are connected in series via interlocking joints, and which is fitted into the guide rail so as to be able to move up and down and opens and closes the opening. When the shutter curtain is bent in the front-to-rear direction due to wind pressure, the shutter curtain is prevented from coming off the guide rail by engaging the engagement receiving portion provided on the first groove side piece with the engagement groove portion provided on the interlock coupling portion. The interlocking connection portion is configured by engaging a first engaging piece extending downward from a slat body piece constituting the slat with a second engaging piece extending upward, the first engaging piece and the second engaging piece being opposed to each other, In a shutter device for a building, the engagement groove portion is constituted by first and second engagement grooves provided in the first and second engagement pieces, A bulging piece portion bulging toward the first groove side piece portion is formed on the slat main body piece portion, A shutter device for buildings characterized in that the bulging piece portion is formed with a third engagement groove that engages with the engagement receiving portion when the shutter curtain is bent by wind pressure.

2. 2. The shutter device for a building according to claim 1, wherein the bulging piece is provided at a position of the slat main body piece biased toward the second engagement piece.

3. 2. The shutter device for a building according to claim 1, wherein the third engagement groove is formed so that the groove bottom position relative to the shutter core is substantially the same as the groove bottom position of the engagement groove portion.

4. The bulging piece portion bulges in a mountain shape toward the engagement receiving portion in an inclined state continuing from the second engagement piece portion, 3. The shutter device for a building according to claim 2, wherein the third engagement groove is formed so as to extend from the top of the bulging piece to both bottom portions across the top.

5. The shutter curtain has anti-slip sections formed on both the left and right edges of the interlocking joint, which restricts the relative left-right movement of adjacent slats. The first, second, and third engagement grooves are formed with the same left-right width and at the same position in the left-right direction, The first and second engagement pieces are formed with first and second engagement end portions extending from the first and second engagement grooves to the slippage prevention portion, 2. The shutter device for a building according to claim 1, wherein the bulging piece portion is formed with a third engaging end portion extending from the third engaging groove to the slat edge.

6. The second groove side piece has a contact receiving portion that protrudes from a portion closer to the groove bottom piece than the engagement receiving portion toward the first groove side piece, and when the shutter curtain is bent toward the first groove side piece and the engagement groove portion and the third engagement groove are engaged with the engagement receiving portion in a wind-resistant position, the contact receiving portion contacts and supports the curtain surface of the shutter curtain on the second groove side piece side, A shutter device for a building as described in claim 5, characterized in that the first and second engagement ends are set to a length such that when the curtain surface on one side of the second groove is in a wind-resistant position in which it abuts against the abutment receiving portion, the corresponding receiving portion is positioned within the left and right width of the first and second engagement ends.

7. A shutter device for a building as described in claim 6, characterized in that the left and right outer edge portions of the first and second engagement ends are located left and right outward from the abutment receiving portion when the shutter curtain is bent and in a wind-resistant position in which the engagement groove portion and the third engagement groove are engaged with the engagement receiving portion.

8. A shutter device for buildings as described in claim 6, characterized in that the first and second engagement ends are set to a length longer than half the length from the outer left and right edges of the engagement groove to the left and right edges of the slat.

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