Guide rail structure for building shutter device

Abstract

To improve wind resistance of an inner rail part 7 formed of a groove bottom side half part 12 and an opening side half part 13 in a guide rail 3 for guiding opening and closing of a shutter curtain 2 having an inner and outer double rail structure which allows the inner rail part 7 to be removed from an outer rail part 6, thereby the shutter curtain 2 being able to be exchanged.SOLUTION: A reinforcing part 12e projecting to a groove deeper side from a groove bottom surface part 12a is formed at a groove bottom side half part 12. At an opening side half part 13, an extension part 13d extended to the groove deeper side in a state opposing to a groove bottom side groove side surface part 12b and a partitioning surface part 13c for partitioning the extension part 13d and an opening side groove side surface part 13a are formed, and the partitioning surface part 13c and an engaging piece part 12c are provided so as to be positioned on the substantially same line in a forward and backward direction.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present invention relates to the technical field of guide rail structures in building shutter devices that are installed in openings such as entrances and exits of buildings (architectures, structures) such as buildings, houses, garages, etc. [Background technology]

[0002] Generally, a shutter device for a building is installed at an opening such as an entrance or exit of a building, a house, a garage, etc., and such a shutter device is configured to guide a shutter curtain up and down on left and right guide rails. In such a shutter device, in order to cope with a case where the shutter curtain is damaged and needs to be replaced, a guide rail with a double rail structure of an outer rail part and an inner rail part has been proposed, and the shutter curtain can be removed from the guide rail by removing the inner rail part from the outer rail part (for example, see Patent Document 1). However, in this type of shutter device, when the shutter curtain is exposed to strong winds and bent, there is a risk that the left and right edges of the shutter curtain may come loose from the guide rail. To avoid this, wind-resistant hooks are provided on the left and right edges of the shutter curtain, while in cases where the guide rail has an inner and outer rail structure as described above, it has been proposed to provide a locking piece on the inner rail to which the wind-resistant hooks can engage (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2002-213167 A [Patent Document 2] Patent No. 6341605 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional structure described above, when the shutter curtain is deflected by a strong wind and the wind-resistant hook engages with the locking piece, the guide rail expands in the front-to-rear direction and receives a load in a direction in which the wind-resistant hook disengages from the locking piece, causing the guide rail to expand and deform, which may result in the wind-resistant hook disengaging from the locking piece. To address this, Patent Document 2 proposes that the reinforcing part arranged on the outer side of the inner rail in the left-right direction be provided on the outer rail part (in the embodiments shown in Figure 11 and earlier) or on the inner rail part (in the embodiments shown in Figure 12 and later), thereby improving the wind resistance of the guide rail itself. Among the above-mentioned conventional structures, the one in which the inner rail portion is provided with a reinforcing portion (inner half portion) is constructed by connecting the inner half portion and the outer half portion, and a locking piece portion is formed in the inner half portion which serves as the reinforcing portion, which has the advantage that the inner rail portion itself can also be reinforced. This structure is such that the outer half portion and the inner half portion are engaged in a concave-convex manner from the front-rear direction at the portion closer to the opening of the guide groove than the locking piece portion formed on the inner half portion, and the structure fastens to the outer rail portion at the portion outside the concave-convex engagement portion in the front-rear direction, so that it has been possible to provide a structure having a wind resistance capacity within the range that had been assumed up until now. However, recently, due to global warming, it is predicted that larger typhoons than previously anticipated will occur, and as a result, there is a demand for further improvement in the wind resistance of the shutter device. When considering this from this perspective, it was suggested that the strength of the locking piece portion where the wind-resistant hook is locked should be increased, and this was made the problem to be solved by the present invention. [Means for solving the problem]

[0005] The present invention has been created in view of the above-mentioned circumstances and with the objective of solving these problems. The invention of claim 1 provides a shutter curtain for opening and closing an opening, and left and right guide rails for guiding the opening and closing of the shutter curtain, the guide rail having a double rail structure with an inner rail section in which a guide groove for the shutter curtain is formed, and an outer rail section attached to the body side and into which the inner rail section is detachably fitted, the inner rail section being configured by connecting on the left and right sides a groove bottom side half section in which a groove side surface section and a groove bottom surface section are formed in the guide groove, and an opening side half section in which a groove side surface section in the guide groove is formed in the opening side, Opening side The leading edge of the shutter curtain is provided with a locking piece for locking the wind-resistant hooks provided on the left and right edges of the shutter curtain. Extends from the groove bottom side toward the inside in the front-rear direction In the formed building shutter device, the groove bottom half has a reinforcing portion extending toward the back side of the groove from the groove bottom surface portion, Bottom of groove The bottom half of the groove between the side of the groove and the locking piece Corner and the groove bottom half side Corner In the case of the guide groove, an L-shaped cutout portion is formed on the outer side surface of the corner, and the cutout portion has a locking protrusion protruding toward the opening side of the guide groove, so that the groove inner side surface portion is formed unevenly, and the opening side half has a groove bottom side half. of The opening side faces the groove side surface from the outside in the front-rear direction. of An extension portion extending toward the inner side of the groove from the groove side portion, and the extension portion and the opening side of A partition surface portion that separates the groove side portion from the opening side of An inner extension surface portion is formed, the inner extension surface portion extending from the partition surface portion toward the inner side of the groove in a state of being biased outward in the front-rear direction from the groove side surface portion, and of Between the groove side portion and the partition surface portion, a corner portion on the opening side half side is formed in a state inwardly located in the front-rear direction from the inner extension surface portion, and the corner portion on the opening side half side has a locking protrusion formed to protrude toward the back side of the groove, so that the opening side ofThe groove deep end edge of the groove side portion is formed in an uneven shape, located at the inner end in the front-to-rear direction beyond the inner extension surface of the partition surface, and when the groove bottom half and the opening half are connected to the left and right, the partition surface and the locking piece are arranged to be positioned approximately on the same line in the front-to-rear direction, the notch of the groove bottom half and the corner of the opening half are fitted together in a state in which the locking protrusions fit together in an offset male-female manner from the left and right direction, the groove side portion on the opening side and the locking piece are abutted at a position where the partition surface and the locking piece are arranged on the same line in the front-to-rear direction, and further, the inner extension surface and Bottom of groove The groove side surface and the opening side of This is a guide rail structure in a shutter device for buildings, characterized in that it abuts at a position further outboard in the front-to-rear direction than the groove side portion. Effect of the Invention

[0006] By adopting the invention of claim 1, the shutter curtain can be replaced by removing the inner rail portion that constitutes the guide rail from the outer rail portion, and yet, when the shutter curtain is bent by a strong wind, a locking piece portion is formed in the bottom half of the groove of the inner rail portion to lock the wind-resistant hook provided on the shutter curtain and prevent the shutter curtain from coming off. In this case, a reinforcing portion extending toward the back of the groove is provided in the bottom half of the groove, and an extension portion is provided in the opening half that extends toward the back of the groove further than the opening groove side portion, and a partition surface portion that separates the extension portion and the opening groove side portion is positioned in a state where it is approximately in line with the locking piece portion in the front-to-rear direction. As a result, the load from the wind-resistant hook is borne by the aligned locking piece portion and partition surface portion, thereby improving the wind resistance. Moreover, The fore-aft outer end surface of the locking piece faces the fore-aft inner surface of the opening gutter side portion, and the groove bottom side portion faces the inner extension surface of the extension portion.As a result, the load received by the locking piece is distributed between the opening gutter side portion and the extension portion, which are arranged on either side of the partition surface portion that is in a straight line with the locking piece, thereby further increasing strength. moreoverA concave groove-shaped cutout is formed on the outer surface of the corner portion between the locking piece portion and the groove bottom side portion, and the outer surface of the corner portion between the opening groove side portion and the partition surface portion fits into this cutout.As a result, the corner portions are securely connected in a male-female fitted state rather than simply connected by abutting, thereby contributing to increased strength. Moreover, The connection between the corners of the groove bottom half and the opening half in a male-female fitted state is achieved by a convex-concave fitting, resulting in a more reliable connection structure which further contributes to increased strength. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a front view of the building shutter. [Diagram 2] FIG. 2 is a side view of the building shutter. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] FIG. [Figure 8] This is a side view of the main parts showing the positional relationship between the shutter curtain and the guide rail. [Figure 9] 13 is a cross-sectional plan view showing the state in which the wind-resistant hooks engage with the guide rails when the shutter curtain is bent due to positive pressure. FIG. [Figure 10] 13 is a cross-sectional plan view showing the state in which the wind-resistant hooks engage with the guide rails when the shutter curtain is bent due to negative pressure. FIG. [Figure 11] FIG. 2 is a perspective view of a main part showing the state in which a wind-resistant hook is attached to a slat. [Figure 12] (A)(B)(C)(D) are a front view, a left side view, a right side view and a plan view of the wind-resistant hook. [Figure 13]The figure shows the shutter curtain wound in a spiral shape, with (A) and (B) being side views of the wound state with and without a recess in the second locking arm of the wind-resistant hook. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a shutter device for a building, and the shutter device 1 is similar to a conventional device in that it is composed of various member devices such as a shutter curtain 2 for opening and closing an opening E, a guide rail 3 for guiding both left and right end edges of the shutter curtain 2 up and down, a winding drum (winding body) 4 disposed above the opening E to wind the shutter curtain 2 in a spiral shape, and an electric opening / closing device 5 for rotating the winding drum 4.

[0009] Incidentally, the shutter curtain 2 is formed by connecting a series of slats 2a, which are long in the left-right direction, in an interlocking manner in the up-down direction. In this case, the slats 2a used in this embodiment are hollow, but the slats 2a are not limited to these, and it goes without saying that commonly known slats, such as those formed by bending a single long plate, can be used as necessary. In addition, the guide rail 3 is constructed using an outer rail portion 6 and an inner rail portion 7 as basic components, and in this embodiment, these inner and outer rail portions 6, 7 have a front-to-back symmetrical shape with the curtain core L of the shutter curtain 2 as the center line (line of symmetry).

[0010] The outer rail portion 6 is formed using an inner half 8 and a pair of front and rear outer halves 9. The inner half 8 is provided with a first piece 8a facing in the front-rear direction to form the groove bottom of the outer rail portion 6, a second piece 8b bent inward in the left-right direction from both the front and rear ends of the first piece 8a, a third piece 8c bent outward in the front-rear direction from the inner left-right end of the second piece 8b, and a fourth piece 8d bent inward in the left-right direction from the outer front-rear end of the third piece 8c, so that the inner half 8 is formed in a roughly C-shape with an open inner side in the left-right direction (opening E side). Furthermore, a locking recess 8e is formed protruding outward in the front-rear direction on the front-rear outer surface of the left-right inner part of the second piece 8b more than the outer left-right end 8g, and a fastening piece 8f is formed protruding outward in the front-rear direction on the outer front-rear surface of the fourth piece 8d at a position outer in the left-right direction than the tip edge 8h. By being configured in this manner, a reinforcing portion space S1 is formed in the inner half 8 by the first piece 8a and a pair of front and rear second pieces 8b, into which the reinforcing portion 12e provided on the inner rail portion 7 described later is fitted.

[0011] On the other hand, the outer half 9 of the outer rail portion 6 is formed with a first piece 9a that is positioned outward in the fore-aft direction of the first piece 8a of the inner half 8 and is flush with the first piece 8a in the left-right direction (straight in the fore-aft direction), and a second piece 9b that is bent inward in the left-right direction from the fore-aft outer end of the first piece 9a, such that the left-right inner end 9e reaches the same position in the left-right direction as the tip edge 8h of the inner half fourth piece 8d. Furthermore, in the outer half 9, a locking protrusion 9c is formed on the inner end of the first piece 9a in the front-to-rear direction toward the inside in the left-right direction, and is adapted to freely engage and disengage from the outside in the left-right direction into the locking recess 8e. A fastening piece 9d is formed on the second piece 9b in the front-to-rear direction and is positioned outside the tip edge 9e of the second piece 9b in the left-right direction and abuts against the inner half fastening piece 8f from the outside in the left-right direction in a layered manner.

[0012] The outer rail portion 6 is assembled by fitting the inner half 8 into the outer half 9 from the inside to the outside in the left-right direction, so that the locking recess 8e and the locking protrusion 9c engage with each other to prevent misalignment in the front-to-back direction, and the stacked fastening pieces 8f, 9d are fastened together with screws 6a to form a single piece. Reference numeral 11 denotes a blocking member that is fitted between the open tip edges 8h, 9e of the outer half second piece 9b and the inner half fourth piece 8d.

[0013] On the other hand, the inner rail portion 7 has a guide groove G formed therein for loosely fitting the left and right edge portions of the shutter curtain 2 to guide it up and down, and is formed using a groove bottom half portion 12 and a pair of front and rear opening side halves 13. The groove bottom half portion 12 has a groove bottom surface portion (groove bottom piece portion) 12a which becomes the groove bottom of the guide groove G, and Bottom of groove A pair of front and rear groove side portions (groove bottom pieces) 12b are provided, which extend from the front and rear end edges of the groove 12a toward the left-right inward side (toward the opening E) and serve as the side surfaces of the groove bottom side of the guide groove G, so that the left-right inward side is open. However, from the tip edge of the groove bottom groove side portion 12b, as is clear from FIG. 4, for example, extension The locking pieces 12c are formed so as to extend outward, narrowing the width of the opening on the left-right inner side. A hook base 18c of a wind-resistant hook 18, which will be described later, is set to pass through loosely between the opposing tip edges 12d of the locking pieces 12c with the narrowed opening width.

[0014] Furthermore, in the groove bottom half 12, a reinforcement portion 12e is formed which extends further toward the back of the groove (outward in the left-right direction) from the groove bottom surface portion 12a and fits loosely into the space S1 surrounded by the inner half first piece portion 8a and the left-right outer half portion of the second piece portion 8b. The reinforcement portion 12e is configured with front and rear reinforcement portion side surface portions 12f which extend outward in the left-right direction from the front and rear groove bottom side surface portions 12b, and a reinforcement portion side bottom surface portion 12g formed between the reinforcement portion side surface portions 12f. The reinforcement portion 12e is formed into a rectangular cylindrical shape in a plan view by adding the groove bottom portion 12a to the three surfaces of the front and rear reinforcement portion side portions 12f and the reinforcement portion side bottom portion 12g, and is designed to reinforce the groove bottom half portion 12. The groove bottom half portion 12 is further reinforced by forming the groove bottom portion 12a, groove bottom groove side portion 12b, locking piece portion 12c, reinforcement portion side portion 12f, and reinforcement portion side bottom portion 12g to be thick.

[0015] In addition, a connecting piece portion 12h is formed on the groove bottom half portion 12, extending in the front-to-rear direction from the groove bottom surface portion 12a beyond the groove bottom side groove portion 12b, and a reinforcing piece portion 12i is bent and formed from the tip edge of the connecting piece portion 12h toward the outside in the left-right direction (toward the back of the groove).When the inner half portion 8 is fitted into the outer half portion 9 to form the guide rail 3 as described below, the reinforcing piece portion 12 is closely opposed to the inner half second piece portion 8b of the outer rail 6, and is designed so that when the inner rail portion 7 expands in the front-to-rear direction due to the shutter curtain 2 bending in the wind, it abuts against the second piece portion 8b and is supported, thereby increasing its strength.

[0016] Furthermore, the corner portion 12j between the groove bottom side groove portion 12b of the groove bottom half portion 12 and the locking piece portion 12c is formed to be even thicker, but a cutout portion 12k cut into an L-shape (concave groove shape) is formed on the outer side surface of the corner portion 12j, and the cutout portion 12k is formed so that the front-rear outer end surface portion 12l of the locking piece portion 12c is formed to fit within the thickness of the groove bottom side groove portion 12b. The cutout portion 12k further has a locking protrusion 12m formed to protrude toward the opening side of the guide groove G in a state of being flush with the front-rear outer surface of the groove bottom side groove portion 12b, and as a result, the groove inner side surface portion of the cutout portion 12k is formed to be uneven.

[0017] On the other hand, the opening side half 13 of the inner rail portion 7 is configured to have an opening side groove side portion 13a extending from the groove bottom side groove side portion 12b toward the opening side (inward in the left-right direction) of the guide groove G, with the locking piece portion 12c disposed therebetween. In this case, the opening side groove side portion 13a is configured so that the groove back side portion fits into the notch portion 12k and faces the locking piece outer end surface portion 12l in an abutting manner. Furthermore, the groove back side edge portion of the opening side groove side portion 13a is formed with a locking protrusion 13b protruding toward the groove back side while being flush with the inner side surface of the edge portion in the front-rear direction, whereby the groove back side edge portion of the opening side groove side portion 13a is formed in an uneven shape. As described below, when the groove bottom half 12 and the opening half 13 are assembled, the opening groove side surface 13a abuts against the locking piece outer end surface 12l, and the locking protrusions 12m, 13b are configured to engage with each other in an offset male-female manner from the left and right direction.

[0018] Furthermore, in the opening side half 13, a partition surface portion 13c is formed extending outward in the front-to-rear direction from the rear end edge of the opening side groove side portion 13a, and an extension portion 13d is formed on the rear side of the groove, partitioned left and right by the partition surface portion 13c, and an inner extension surface portion 13e for forming the extension portion 13d is extended toward the rear side of the groove from the partition surface portion 13c at a portion that is biased (displaced) outward from the inner surface of the opening side groove side portion 13a in the front-to-rear direction. The extension portion 13d has a rectangular cylindrical shape in a plan view and is made up of the inner extension surface portion 13e, an outer extension surface portion 13f which is extended from a position outer than the inner extension surface portion 13e of the partition surface portion 13c in the fore-and-aft direction toward the inner side of the groove, a groove inner side extension surface portion 13g which connects the groove inner side end edges of the inner and outer extension surface portions 13e, 13f, and the inner half of the partition surface portion 13c in the fore-and-aft direction.

[0019] When the groove bottom half 12 and the opening side half 13 are assembled, the corner portion 13k between the opening side gutter side portion 13a and the partition surface portion 13c of the opening side half 13 fits into the notch portion 12k provided in the corner portion 12j between the groove bottom side gutter side portion 12b and the locking piece portion 12c of the groove bottom half 12, so that the inner extension surface portion 13e abuts against the groove bottom side gutter side portion 12b from the outside in the front-to-rear direction, and the groove rear extension surface portion 13g is stacked on the connecting piece portion 12h of the groove bottom half 12 from the groove opening side. In this assembled state, the stacked portions are connected via screws 7a, so that the groove bottom half 12 and the opening half 13 are connected and the inner rail 7 is assembled as a single unit.

[0020] Furthermore, the opening side half 13 is formed with an opening side outer surface portion 13h that protrudes toward the opening side from the partition surface portion 13c at a portion that is biased (displaced) more inward in the fore-and-aft direction than the outer extension surface portion 13f of the partition surface portion 13c, and an opening side tip surface portion 13i that connects the tip edges of the opening side outer surface portion 13h and the opening side groove side portion 13a.As a result, the opening side half 13 has a rectangular cylindrical shape in a plan view, even in the opening side portion from the partition surface portion 13c, due to the opening side groove side portion 13a, the opening side outer surface portion 13h, the opening side tip surface portion 13i, and the fore-and-aft direction inner half of the partition surface portion 13c. Furthermore, an attachment groove 13j is formed on the opening side groove side portion 13a of the opening side half portion 13 for attaching a cushioning material 15 to reduce interference with the shutter curtain 2 inserted into the guide groove G.

[0021] The inner rail portion 7, with the groove bottom half portion 12 and the opening side half portion 13 assembled in this manner, is then assembled into the outer rail portion 6, with the inner half portion 8 and the outer half portion 9 assembled.In this case, when the reinforcement portion 12e and extension portion 13d of the inner rail portion 7 are assembled in a state where they are fitted into the second piece portion 8b of the outer rail portion 6, the reinforcement portion 12e fits into the reinforcement portion space S1 provided in the outer rail portion 7, and the front-to-rear outer half portion of the partition surface portion 13c abuts (overlaps, stacks) against the inner half third piece portion 8c from the inside in the left-right direction.This abutment portion is assembled together with the outer rail portion 6 and the inner rail portion 7 by the screw 3a inserted between the inner half fourth piece portion 8d and the opening side outer surface portion 13h of the opening side half portion 13, thereby forming the guide rail 3. In this device, when the opening E is open with the shutter curtain 2 wound around the winding drum 4, the inner rail 7 is removed from the outer rail 6, and then the shutter curtain 2 is lowered and moved to either the left or right, so that the other side edge of the shutter curtain 2 comes off the guide rail 3. Then, by moving the shutter curtain 2 in this detached state to the other side, the one side edge also comes off the guide rail 3, allowing the shutter curtain 2 to be removed from the guide rail 3 for maintenance such as replacement.

[0022] When the outer rail portion 6 and the inner rail portion 7 are assembled in this manner, the reinforcing piece portion 12i of the groove bottom side half and the outer extension surface portion 13f of the opening side half 13 are adjacent to or abutting against the second piece 8b of the outer rail portion 6, and the fore-to-aft outer half of the partition surface portion 13c is fixed to the inner half third piece 8c of the outer rail portion 6 in a state where it is approximately in line with the locking piece portion 12c in the fore-to-aft direction. In this device, between the fourth piece 8d of the inner half and the opening side outer surface portion 13h of the opening side half 13 there is a gap that is open on the inside in the left-right direction, and the opening is sealed with a sealing material 16 fixed via screws 16a. If necessary, the sealing material 16 can be provided with a light-emitting and receiving type obstacle detection sensor 17, which makes it possible to detect the presence or absence of an object passing through the opening E. Incidentally, in the guide rail 3 of this embodiment, the outer rail 6 is also thickened to increase its strength. Specifically, the outer end 8g in the left-right direction of the second arm 8b in the inner half 8 of the outer rail 6 (including the corner between the first arm 8a and the second arm 8b) and the corner between the first arm 9a and the second arm 9b in the outer half 9 and the fastening arm 9d are thickened. The reason for increasing the strength by thickening the wall in this way is that the wind-resistant hook 18 directly interferes with the groove bottom half 12 of the inner rail portion 7, and a load acts to expand in the front-rear direction.

[0023] Wind-resistant hooks 18 are provided at both left and right end edges of the slats 2a of the shutter curtain 2 so as to protrude outward in the left-right direction, and the wind-resistant hooks 18 have base ends 18a that are fitted into the slats 2a and fixed by rivets 18b, which are fasteners. The wind-resistant hook 18 is formed in a T-shape in a plan view by having a hook base 18c extending outward in the left-right direction from the base end 18a, and first and second locking arms 18e, 18e extending in the front-to-rear direction from the tip edge of the hook base 18c.When the shutter curtain 2 is assembled into the guide rail 3, the wind-resistant hook 18 is configured so that the hook base 18c penetrates between the front and rear locking pieces 12c, and the first and second locking arms 18e, 18e are loosely arranged in the locking portion space S2 formed by the groove bottom surface portion 12a of the groove bottom half portion 12, the groove bottom side groove portion 12b, and the locking piece portion 12c.

[0024] The wind-resistant hook 18 extends outward in the left-right direction with the hook base 18c aligned with the curtain core (shutter core) L of the shutter curtain 2, and a first locking arm 18d is bent from the tip of the hook base 18c toward the outdoors, while the second locking arm 18e is bent toward the indoors and is shorter than the first locking arm 18d. Moreover, the opening side portion 18f of the first locking arm 18d is bent at an angle θ1 relative to the curtain core L at approximately a right angle, while the opening side portion 18g of the second locking arm 18e is bent at an angle θ2 relative to the curtain core L at an obtuse angle.

[0025] Moreover, the tip edge 18h of the second locking arm 18e (the edge on the indoor side when the shutter curtain 2 is closed) is formed with a recessed fitting portion 18k whose vertical middle portion is curved toward the outdoor side. With this configuration, when the shutter curtain 2 is wound in a spiral shape on the winding drum 4, as shown in Fig. 13, if the tip edge 18i of the first locking arm 18d on the inner circumference side and the tip edge 18h of the second locking arm 18e on the outer circumference side interfere with each other (abut), the slat 2a on the outer diameter side in Fig. 13 (B) without the recessed fitting portion 18k bulges outward compared to the one in Fig. 13 (A) with the recessed fitting portion 18k, impairing the winding posture and increasing the winding diameter, which is a problem that is solved by the one with the recessed fitting portion 18k. Incidentally, in addition to forming the recessed fitting portion 18k, the extension length of the outer second locking arm portion 18e is also set to be shorter than that of the first locking arm portion 18d, which contributes to reducing the roll-up diameter of the shutter curtain 2. Moreover, in this embodiment, when the shutter curtain 2 is in its normal position without being bent, the entire tip edge 18h including the recessed portion 18k is located further outward in the front-to-rear direction than the tip edge 12d of the locking piece 12c, as shown in Figure 8. Therefore, when the shutter curtain 2 is bent toward the outdoors as described above, the second locking arm 18e is engaged with the locking piece 12c over its entire vertical width from the initial stage of bending, resulting in a high prevention effect.

[0026] When the shutter curtain 2 configured in this manner is bent under the load of strong winds while in the closed state, if the load direction is positive pressure from the outdoors toward the indoor side, the central portion of the shutter curtain 2 will bend toward the indoor side, and as a result, the wind-resistant hook 18 will be in an inclined position in which the corner portion 18j of the hook base 18c and the first locking arm 18d (opening side portion 18f) abuts against the tip edge 12d of the outdoor locking piece 12c, as shown in Figure 9, and the indoor side of the shutter curtain 2 abuts against the opening edge portion of the indoor opening gutter side portion 13a (mounting groove 13j in this embodiment), or in a position similar to this, thereby preventing the shutter curtain 2 from slipping off the guide rail 3.

[0027] In contrast, when the load on the shutter curtain 2 is negative pressure directed from the indoors to the outdoors, the central portion of the shutter curtain 2 will bend toward the outdoors, and as a result, as shown in Figure 10, the corner portion 18l of the hook base 18c and the second locking arm 18e (opening side portion 18g) of the wind-resistant hook 18 engages with the tip edge 12d of the indoor side locking piece 12c, and the tip edge 12d of the outdoor side locking piece 12c engages with the opening side portion 18f of the first locking arm 18d, and further, the outdoor side of the shutter curtain 2 assumes an inclined position in contact with the opening edge of the outdoor side opening gutter side portion 13a (mounting groove 13j in this embodiment), thereby preventing the shutter curtain 2 from slipping off the guide rail 3. In this case, since the opening side portion 18g of the second locking arm 18e forms an obtuse angle with respect to the curtain core L, when the shutter curtain 2 is bent toward the outdoors, the wind-resistant hook 18 is securely locked to the corner portion 18l between the hook base 18c and the second locking arm 18e (opening side portion 18g), thereby providing a high level of prevention of the shutter curtain 2 from slipping off from the guide rail 3.Furthermore, in this case, the tip edge portion 12d of the outdoor locking piece 12c is locked to the opening side portion 18f of the first locking arm 18d, thereby providing two-point locking and retention, and in addition, a three-point support structure is formed in which the outdoor side of the shutter curtain 2 abuts against the opening end edge of the outdoor opening gutter side portion 13a, thereby providing an even better prevention effect of the shutter curtain 2 from slipping off from the guide rail 3.

[0028] In this embodiment, the wind-resistant hook 18 is configured as described above to provide excellent wind resistance, and furthermore, the guide rail 3 itself is also designed to have a high wind resistance. As mentioned above, when the shutter curtain 2 is bent in the indoor / outdoor direction due to the load of strong winds, a load is applied to the locking piece 12c in the front-to-back direction via the wind-resistant hook 18, which is inclined relative to the curtain core L, and the inner rail portion 7 is deformed by the load in the direction of expanding in the front-to-back direction.As a result, the wind-resistant hook 18 is released from the locking piece 12c (the lock is released), and the shutter curtain 2 is expected to slip out of the guide groove G.

[0029] In order to deal with this, in this device, a reinforcing portion 12e is provided in the groove bottom half 12, which is a component of the inner rail portion 7, extending further into the groove than the groove bottom surface portion 12a, while an extension portion 13d is formed in the opening half 13, extending further into the groove than the opening side groove side portion 13a in a state facing the groove bottom side groove side portion 12b from the outside in the front-to-rear direction, and the extension portion 13d and the opening side groove side portion 13a are separated by a partition surface portion 13c. In this case, the partition surface portion 13c is positioned approximately in the same line in the front-to-rear direction with respect to the locking piece portion 12c that receives the load from the wind-resistant hook 18 in the direction toward the outside in the front-to-rear direction, and is provided in a continuous state in the front-to-rear direction. As a result, the load from the wind-resistant hook 18 is received by the locking piece portion 12c and the partition surface portion 13c, thereby improving the wind resistance. Furthermore, in this case, the fixing portion of the partition surface portion 13c to the outer rail portion 6 via a screw 3a is also arranged in the same straight line as the locking piece portion 12c, so that further strength can be increased.

[0030] Moreover, in this case, the front-to-rear outer end surface portion 12l of the locking piece portion 12c faces and abuts against the front-to-rear inner surface of the opening gutter side portion 13a, and the groove bottom side portion 12b faces and abuts against the inner extension surface portion 13e of the extension portion 13d. Therefore, the load received by the locking piece portion 12c is distributed and received by the opening gutter side portion 13a and the extension portion 13c formed on both the left and right sides of the partition surface portion 13c, and consideration is given to further increasing strength here as well.

[0031] In addition, a concave groove-shaped cutout 12k is formed on the outer surface of corner portion 12j between locking piece portion 12c and groove bottom side portion 12b, and corner portion 13k between opening side groove side portion 13a and partition surface portion 13c is fitted into cutout portion 12k, so that corner portions 12j, 13k are securely connected in a male-female fitted state rather than simply connected in a butted state, which contributes to increased strength. Furthermore, in this structure, when corner portions 12j, 13k between groove bottom half 12 and opening half 13 are connected in a male-female fitted state, locking protrusion 12m provided on groove bottom half 12 and locking protrusion 13b provided on opening half 13 are connected by concave-convex fitting in which they engage with each other in a misaligned manner, which is a more secure connection structure that contributes to increased strength.

[0032] In the embodiment of the present invention configured as described above, the shutter curtain 2 can be replaced or otherwise maintained by removing the inner rail portion 7 constituting the guide rail 3 from the outer rail portion 6. However, when the shutter curtain 2 is bent by a strong wind, the wind-resistant hook 18 provided on the shutter curtain 2 is engaged with the locking piece portion 12c formed on the groove bottom half portion 12 of the inner rail portion 7 to prevent the shutter curtain 2 from coming off. In this case, the groove bottom half portion 12 is provided with a locking piece portion 12c on the groove bottom side. An extended reinforcing portion 12e is provided, and an extension portion 13d is provided on the opening side half 13, which extends further into the groove than the opening gutter side portion 13a, and a partition surface portion 13c that separates the extension portion 13d and the opening gutter side portion 13a is provided in a state where it is positioned approximately in the same line in the fore-and-aft direction with respect to the locking piece portion 12c.As a result, the load from the wind-resistant hook 18 is borne in a straight line by the aligned locking piece portion 12c and partition surface portion 13c, thereby improving the wind resistance.

[0033] Furthermore, in this structure, the front-to-rear outer end surface 12l of the locking piece 12c abuts against the front-to-rear inner surface of the opening gutter side surface 13a, and the groove bottom side surface 12b abuts against the inner extension surface 13e of the extension 13d. As a result, the load received by the locking piece 12c is distributed between the opening gutter side surface 13a and the extension 13d, which are arranged on either side of the partition surface 13c, which is in a straight line with the locking piece 12c, thereby further increasing strength. Furthermore, a concave groove-shaped cutout portion 12k is formed in the outer surface portion of corner portion 12j between locking piece portion 12c and groove bottom side portion 12b, and the outer surface portion of corner portion 13k between opening side groove side portion 13a and partition surface portion 13c is fitted into cutout portion 12k. As a result, corner portions 12j, 13k are securely connected in a male-female fitted state rather than simply connected in a butted state, which contributes to increased strength. Furthermore, the connection between the corner portions 12j, 13k of the groove bottom half 12 and the opening half 13 in a male-female mating state is achieved by the mismatched recessed and projecting engagement of the locking protrusions 12m, 13b formed on each portion, resulting in a more reliable connection structure which further contributes to increased strength. [Industrial Applicability]

[0034] The present invention can be used as a guide rail structure in a building shutter device that is attached to an opening such as an entrance or exit of a building. [Explanation of symbols]

[0035] 1 Shutter device 2. Shutter Curtain 3 Guide rail 4 Winding drum 6 Outer rail 7 Inner rail 8 Inner half 9 Outer half 12 Groove bottom half 12a Bottom of groove 12b Bottom of the ditch, side of the ditch 12c Locking piece 12e Reinforcement 12j Corner section 12k cutout 13 Opening side half 13a Open gutter side 13c Partition surface 13d extension 13k Corner 18 Windproof hook 18c Hook base 18d First locking arm 18e Second locking arm 18k recessed part E Opening G Guide groove L Curtain Core

Claims

[Claim 1] The shutter curtain opens and closes the opening, and the left and right guide rails guide the opening and closing of the shutter curtain. The guide rail is a double rail structure having an inner rail portion in which a guide groove for the shutter curtain is formed and an outer rail portion attached to the body side and into which the inner rail portion is detachably fitted; the inner rail portion is configured by connecting, on the left and right sides, a groove bottom half portion in which a groove side surface portion and a groove bottom surface portion on the groove bottom side of the guide groove are formed, and an opening half portion in which a groove side surface portion on the opening side of the guide groove is formed, In a shutter device for buildings, a locking piece portion for locking a wind-resistant hook provided on the left and right end edges of the shutter curtain is formed at the tip edge of the opening side of the bottom half of the groove, the locking piece portion extending inward in the front-rear direction from the groove side portion on the bottom side of the groove, The groove bottom half has A reinforcing portion extending toward the inner side of the groove from the bottom surface portion of the groove; a corner portion on a half side of the bottom of the groove between a groove side portion on the bottom of the groove and the locking piece portion; is formed, At the corner portion on the bottom half of the groove, an L-shaped notch is formed on the outer surface of the corner, The notch portion has a recessed and protruding engagement portion protruding toward the opening of the guide groove, and the recessed and protruding engagement portion is formed on the inner side surface of the groove. On the opening half, an extension portion extending toward the back of the groove from the groove side surface portion on the opening side in a state facing the groove side surface portion on the groove bottom side of the groove bottom half portion from the outside in the front-to-rear direction; a partition surface portion that separates the extension portion from the groove side surface portion on the opening side; an inner extension surface portion extending from the partition surface portion toward the inner side of the groove in a state of being biased outward in the front-rear direction from the groove side surface portion on the opening side; is formed, A corner portion on the opening side half side is formed between the groove side portion on the opening side and the partition surface portion, the corner portion being located more inward in the front-rear direction than the inner extension surface portion, The corner portion on the opening side half side is formed in an uneven shape in a state where the locking protrusion is formed to protrude toward the groove depth side, so that the groove depth side edge portion of the groove side surface portion on the opening side is located at the inner end portion in the front-rear direction beyond the inner extension surface portion of the partition surface, In a state where the groove bottom half and the opening half are connected to the left and right, The partition surface portion and the locking piece portion are disposed in a state where they are positioned substantially on the same line in the front-rear direction, The notch of the bottom half of the groove and the corner of the opening half are fitted together in a state where the locking protrusions are misaligned from the left and right direction, the groove side surface portion on the opening side and the locking piece portion come into contact with each other at a portion where the partition surface portion and the locking piece portion are arranged on the same line in the front-rear direction, Furthermore, the guide rail structure in a shutter device for buildings is characterized in that the inner extension surface and the groove side surface on the groove bottom side abut at a position outer in the front-to-rear direction than the groove side surface on the opening side.

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