JP2024064133A - Slat of shutter device for building - Google Patents

Abstract

To establish that when a shutter curtain 3 bends forward due to negative pressure and a front side locking part 8 provided on a slat locks with a locking part 7 provided on the side of a guide rail 2 to prevent the shutter curtain 3 from coming off, the front side locking part 8 is assured to be locked to a locking receiving part.SOLUTION: A front side locking part 8 is formed in an elongated slot shape extending from a slat surface part 6g of a slat 6 through upper and lower bent parts 6e, 6f to an intermediate part of upper and lower sloped surface parts 6c, 6d, thereby preventing the coming-off prevention locking of the locking receiving part 7 from the front side locking portion 8 is prevented from being obstructed by the bent portions 6e, 6f.SELECTED DRAWING: Figure 6

Description

The present invention relates to the technical field of slats in building shutter devices that are installed in openings such as entrances and exits of buildings such as buildings and houses.

Today, shutter devices for buildings are sometimes installed at openings such as entrances to buildings such as buildings and houses to open and close the opening. Such shutter devices are generally configured with various components such as guide rails installed on the left and right sides of the opening, and shutter curtains that are guided up and down by the guide rails to open and close the opening.
In such a shutter device, when the shutter curtain is closed, it will bend in the front-to-back direction (indoor/outdoor direction) if it is hit by a strong wind. If this strong wind is a strong wind (heavy wind) that occurs during bad weather such as a typhoon or heavy rain, the shutter curtain will bend so much that both left and right end edges may come out (detach) from the guide rails. Therefore, in the past, various anti-slip (anti-detachment) structures have been proposed to prevent such shutter curtains from coming out (detaching) from the guide rails.
As such an anti-slip structure, for example, a structure has been proposed in which recessed locking portions are formed on the left and right edge portions of the slats, which are components of the shutter curtain, that fit into the guide rails, and these locking portions lock into locking receiving portions provided at the open end of the guide rails when the shutter curtain is deflected by a strong wind, thereby preventing the shutter curtain from slipping out of the guide rails (see, for example, Patent Document 1).

JP 2001-164852 A

The above-mentioned conventional structure is effective as a structure to prevent the shutter curtain from slipping out of the guide rail, but in a structure in which the slats are configured with a slat surface portion arranged at the front, upper and lower connecting halves arranged at the rear to connect adjacent slats with an interlocking connection, and upper and lower inclined surface portions that connect the front slat surface portion to the upper and lower connecting halves at an angle, the locking portion is formed only on the slat surface portion (see Figure 9). As a result, there are problems with this structure, such as the risk that the bent portions formed above and below the locking portion get in the way and prevent it from smoothly locking into the locking receiving portion, and these are the issues that the present invention aims to solve.

The present invention has been created in view of the above-mentioned circumstances and with the objective of solving these problems, and the invention of claim 1 relates to a shutter device for a building comprising guide rails provided on the left and right sides of an opening, a shutter curtain which opens and closes the opening by being guided up and down with both left and right end portions fitted into guide grooves of the guide rails, and a winding body which is provided above the opening and winds up the shutter curtain, and which prevents the shutter curtain from slipping out of the guide rail when it is bent in the front-rear direction by a strong wind by engaging locking parts provided on the slats which constitute the shutter curtain with locking receiving parts provided in the guide grooves, the slats interlocking with the slat surface parts provided on the front side and adjacent slats A slat in a shutter device for a building is configured with upper and lower connecting halves arranged on the rear side to be connected by a lock connection, and upper and lower inclined surface portions that connect the front slat surface portion and the upper and lower connecting halves on the rear side at an incline, and a locking portion for locking the slat to a locking receiving portion formed on the opening end edge of the guide groove is formed in the slat surface portion in a concave groove shape that opens outward in the front-to-rear direction in a planar view, and the locking portion has an inner left-right piece formed in an inclined shape that is biased outward in the left-right direction toward the bottom of the groove of the locking portion, and the locking portion becomes wider inward in the left-right direction toward the opening end of the locking portion, and is formed in a state where it extends from the slat surface portion over the upper and lower bends to the upper and lower inclined surface portions.
The invention of claim 2 is a slat in a shutter device for a building described in claim 1, characterized in that the engagement portion is a vertical hole that is long in the vertical direction and reaches the bottom of a hole formed in the middle of the upper and lower inclined surface portions.
The invention of claim 3 is a slat in a shutter device for a building described in claim 2, characterized in that the portion formed on the upper and lower inclined surface portions of the engaging portion is formed in an inclined manner such that the inner left-right piece is biased outward in the left-right direction from the upper and lower bends toward the bottom of the groove, relative to the portion formed on the slat surface portion of the engaging portion when viewed in a plane.
The invention of claim 4 is a slat in a shutter device for a building as described in claim 3, characterized in that the engaging portion has a portion formed on the slat surface portion that corresponds to the groove opening of the engaging portion, and a portion formed on the upper and lower inclined surface portions that corresponds to the groove side piece of the engaging portion.
The invention of claim 5 is a slat in a shutter device for a building described in the above-mentioned claim 4, characterized in that the inclined piece formed on the left-right inner piece of the engaging portion is extended so as to extend beyond the upper and lower bends and reach the slat surface portion.

By adopting the invention of claim 1, the shutter curtain that has been bent due to strong winds is prevented from slipping out of the guide rail by the locking portion formed on the slat engaging with the locking receiving portion provided on the guide rail. In this case, the locking portion formed on the slat surface portion extends not only to the slat surface portion, but also beyond the upper and lower bent portions to the upper and lower inclined surface portions. As a result, the locking portion has a deep groove that reaches from the bent portion to the inclined surface portion in a plan view, so that the bent portion does not get in the way and the locking portion can be smoothly locked into the locking receiving portion.
By adopting the invention of claim 2, the bottom of the hole of the locking portion is formed in the middle part of the inclined surface portion. As a result, even though the locking portion is elongated and formed on the inclined surface portion, it is possible to ensure strength compared to an locking portion formed over the entire width of the inclined surface portion, thereby achieving a highly reliable locking mechanism to prevent slipping out.
By adopting the invention of claim 3, the portion formed on the left-right inner piece of the upper and lower inclined surface portions of the engaging portion is formed in an inclined shape that is biased outward in the left-right direction from the upper and lower bends toward the bottom of the groove relative to the portion formed on the slat surface portion when viewed in a plane, making it easy to make the engaging portion wider toward the groove opening side.
By adopting the invention of claim 4, the locking portion, which is inclined on the inside in the left-right direction, has a groove opening portion formed on the slat surface portion, and the portions formed on the upper and lower inclined surface portions serve as groove side pieces of the locking portion, so that the locking portion can be formed while making effective use of the inclination of the inclined surface portions, thereby simplifying the structure.
By adopting the invention of claim 5, when forming the inclined piece portion formed on the left-right inner piece of the locking portion, it can be formed so as to extend beyond the upper and lower bends to reach the slat surface portion.In this way, the inclined piece portion will not remain in a step-like manner on the inclined surface portion, and the locking receiving portion can be smoothly released from the locking.

FIG. FIG. 2 is a vertical cross-sectional view of the shutter device. FIG. FIG. 4 is a vertical cross-sectional view of the main part of the shutter curtain. 1A and 1B are plan views of the guide rail and the cushioning material attachment portion. 1A, 1B, 1C, and 1D are a front view, a rear view, a plan view, and a bottom view of the left and right edge portions of a slat. 4 is a plan cross-sectional view of a locking portion of the slat in a normal state. FIG. 1A, 1B, and 1C are a side view of a slat, a vertical cross-sectional view of a locking portion, and a front view of the slat in an unfolded state. FIG. 2 is a vertical cross-sectional view of a locking portion of an interlocked slat. FIG. 1A, 1B, and 1C are longitudinal cross-sectional views of the interlock connection portion in a normal state, a state where the interlock connection portion has been relatively moved in the forward and backward directions, and a state where the interlock connection portion has been wound on a winding body. 13A and 13B are diagrams illustrating the state in which the shutter curtain is prevented from falling out when it is bent due to positive and negative pressure. 13A and 13B are cross-sectional plan views of essential parts showing the state in which the slats are prevented from slipping out when subjected to positive and negative pressure. 11A to 11D are cross-sectional plan views of the essential parts showing the process in which the shutter curtain returns to its original state from the prevented-from-falling state in which it is subjected to positive pressure. 11A to 11D are explanatory diagrams showing the process in which the shutter curtain returns to its original state from the prevented-from-falling state in which it is subjected to negative pressure. FIG. 11 is a plan cross-sectional view of a locking portion of a slat in a normal state according to a second embodiment. 13A to 13D are operation explanations showing the process in which the shutter curtain of the second embodiment returns to its original state from the retained state. 13A, 13B, and 13C are cross-sectional plan views of essential parts showing a normal state, a state where positive pressure is applied, and a state where the retaining member is prevented from coming off when negative pressure is applied in the third embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, 1 denotes a shutter device for a building, which is installed at an opening E such as an entrance or exit, and is configured with various member devices such as guide rails 2 provided on the left and right sides of the opening E, a shutter curtain 3 which is guided up and down with both left and right end edges fitted into guide grooves X of the guide rails 2 to open and close the opening E, and a winding body (winding wheel, winding drum) 4 which is arranged above the opening E and winds up the shutter curtain 3 with a seat plate 3c at its lower end. The shutter device 1 of this embodiment is a manual type in which the shutter curtain 3 is guided by the guide rails 2 to open and close the opening E by manually moving the shutter curtain 3 up and down, but it goes without saying that the present invention can also be implemented with an electric type which is provided with an electric opening and closing machine linked to the winding body 4 and opens and closes the shutter curtain 3 by rotating the winding body 4 based on the forward and reverse drive of the opening and closing machine.
In the present embodiment, the outdoor side is the front side and the indoor side is the rear side, but the definition of the front and rear directions is not limited to this embodiment.

The guide rail 2 is shaped like an U-shape with an open inner end in the left-right direction and is composed of a spanning piece 2a on the outer left-right direction and front and rear leg pieces 2b extending inward in the left-right direction from both front and rear end edges of the spanning piece 2a. The spanning piece 2a and the front and rear leg pieces 2b surround the guide groove X on three sides, forming a concave groove-like guide groove X with an open end on the inner left-right direction.
A cushioning material attachment portion 2c for attaching a base 5a of a cushioning material (mohair) 5 is formed at the left and right tip edges of the front and rear leg pieces 2b, protruding toward the inside in the front-to-rear direction (towards the curtain core Z).The cushioning material 5 is configured to abut (slide against) the front and rear curtain surfaces 3a, 3b of the shutter curtain 3 in the closed position to prevent impurities such as dust from entering the guide rail and to provide a screen to prevent the inside of the guide rail 2 from being seen.

The cushioning material mounting portion 2c is configured to include a left-right inner piece 2ca and an outer piece 2cb which are formed at the left-right inner end (tip) of the front and rear leg pieces 2b with gaps on the inside and outside in the left-right direction and protrude toward the inside in the front-rear direction (towards the curtain core Z).A cross-shaped mounting groove 2cc is formed in the area formed by the inner and outer pieces 2ca, 2cb and the front and rear leg pieces 2b, and the base 5a of the cushioning material 5 is configured to be attached and detached freely in the mounting groove 2cc.
The front and rear cushioning attachment parts 2c configured in this manner are formed to be symmetrical with respect to the front-rear axis about the curtain core (shutter core) Z of the shutter curtain 3, which is the center line facing the left-right direction of the guide groove X in a plan view. In other words, the front and rear cushioning attachment parts 2c are configured to be symmetrical with respect to the front-rear axis at the same position in the left-right direction.
Incidentally, the guide rail 2 in this embodiment is simply U-shaped, but as shown in Figure 5 (A), for example, it may be configured so that an attachment piece 2d for attachment to the main body is provided on the leg piece 2b on one side in the fore-aft direction (for example, the leg piece on the indoor side). In this manner, whether or not to provide the attachment piece 2d, and if so, at which location, etc. can be appropriately set according to need.

On the other hand, the shutter curtain 3 is constructed by connecting adjacent slats 6 in the vertical direction through an interlocking connection, and the slats 6 are configured to include upper and lower connecting halves 6a, 6b for the interlocking connection, upper and lower inclined surface portions 6c, 6d extending at an incline from the upper and lower connecting halves 6a, 6b toward the front in the vertical inward direction (toward the center of the vertical width of the slats 6), and a slat surface portion 6g which is wider in the vertical direction and connects the front end edges of the upper and lower inclined surface portions 6c, 6d via bent portions 6e, 6f which are bent inward in the vertical direction from the front end edges (tip edges) of the upper and lower inclined surface portions 6c, 6d. By being configured in this manner, the slat 6 has the slat surface portion 6g disposed on the front side (outdoor side) and the upper and lower joint halves 6a, 6b disposed on the rear side (indoor side), and has upper and lower inclined surface portions 6c, 6d that connect the top and bottom of the slat surface portion 6g to the upper and lower joint halves 6a, 6b at an angle, and the upper and lower ends of the slat surface portion 6g to the front ends of the upper and lower inclined surface portions 6c, 6d are connected via upper and lower arc-shaped bends 6e, 6f. By being configured in this manner, the slat 6 is configured to have a slat thickness in which the front slat surface portion 6g and the rear upper and lower joint halves 6a, 6b are biased forward and backward.

The upper and lower connecting halves 6a, 6b are both formed in an arc shape in side view, but the lower connecting half 6b is smaller (smaller diameter) than the upper connecting half 6a. By fitting the smaller diameter lower connecting half 6b into the larger diameter upper connecting half 6a, the upper and lower adjacent slats 6 are interlocked in a loose fit state, with the upper connecting half 6a as the outer skin (outer part) and the lower connecting half 6b as the inner skin (inner part), allowing them to swing freely in the front and rear directions. By making this interlock connection, the upper and lower adjacent slats 6 form a shutter curtain 3 in a state where they are connected in a series via the interlock connection part Y.

Moreover, the interlock connection which results in the loose fit is such that the upper connecting half 6a and the lower connecting half 6b are connected in a loose fit state with a gap which allows them to move freely relative to each other in the vertical and front-to-rear directions.By configuring the slats 6 in this manner, when they are in the normal (usual) closed position as shown in Figures 9 and 11 (A), the lower surface (lower top surface) of the upper piece 6aa of the upper connecting half 6a abuts the upper surface (upper top surface) of the upper piece 6ba of the lower connecting half 6b, and the shutter curtain 3 is flat (flush).
If the slats 6 connected by such an interlocking connection are hit by a strong wind, for example, they can move relatively in the fore-and-aft direction until the tip edge 6bb of the lower connecting half 6b abuts the front piece 6ab of the upper connecting half 6a, as shown in Figure 11 (B), and even when they have moved relatively in the fore-and-aft direction in this way, the shutter curtain 3 remains approximately flat.
Furthermore, when the shutter curtain 3 is in the open position, it is wound in a spiral shape around the winding body 4, and in this case the slats 6 are connected in such a way that the slats 6 are bent with the lower piece 6bc of the lower connecting half 6b abutting the lower piece 6ac of the upper connecting half 6a, as shown in Figure 11 (C).

The slats 6 connected by the interlock connection in this way are connected in a state in which they can move left and right simply by being interlocked, and in order to regulate this, in this embodiment, crimping notches 6h are formed on both left and right end edges of the lower joint half 6b, while crimping parts (not shown) are formed to protrude at positions corresponding to the crimping notches 6h of the upper joint half 6a in the interlocked state, thereby regulating the left and right movement of the slats 6. In this case, the regulation of left and right movement is not rigid, but is a crimping fixation that allows relative left and right movement, because it is necessary to take into account the bending of the shutter curtain 3, which will be described later.
Incidentally, the configurations of the guide rail 2, shutter curtain 3, and slats 6 are all well-known and general-purpose in the past, and the shutter curtain anti-slip structure of the present invention is implemented in the guide rail 2, shutter curtain 3, and slats 6 configured in this manner, and these configurations will be described in detail below.

The shutter curtain 3 is prevented from slipping out of the guide rail 2 by the front and rear locking receiving parts 7 on the guide rail 2 engaging with the front and rear locking receiving parts 8, 9 on the slats 6, which are components of the shutter curtain 3, and the left and right end edges of the shutter curtain 3, which are loosely fitted into the guide grooves X of the guide rail 2, being locked (prevented) from slipping out of the guide rail 2 when the shutter curtain is deflected in the front-to-rear direction by a strong wind. These front and rear locking receiving parts 7 and front and rear locking parts 8, 9 are configured to have a linear symmetrical shape with the curtain core (shutter core) Z of the shutter curtain 3 as the axis of symmetry when viewed in a plan view.

First, we will explain the front and rear locking receiving portions 7 provided on the guide rail 2. The locking receiving portions 7 protrude inward in the front-to-rear direction in a line-symmetrical manner from the tip edge of the outer piece 2cb of the cushioning material mounting portion 2c, which is formed in a line-symmetrical manner.
Specifically, the locking receiving portion 7 protrudes from the tip edge of the outer piece 2cb of the cushioning attachment portion located on the groove bottom side (outside in the left-right direction) from the opening edge of the guide groove X toward the inside in the front-rear direction from the tip 2cd of the inner piece 2ca, and has an inner piece 7a in the left-right direction and an outer piece 7b. As shown in Fig. 5(B), the inner piece 7a is inclined toward the back side of the guide groove X (outside in the up-down direction) toward the tip side (inward in the front-rear direction) to form an inclined surface having an angle α with respect to the curtain core Z, while the outer piece 7b is a vertical surface that is perpendicular to the curtain core Z. With this configuration, the locking receiving portion 7 has a right-angled triangular shape with the minimum angle (acute angle) in a state where the tip 7c is biased toward the back side of the groove (outside in the left-right direction) from the outer piece 2cb of the cushioning attachment portion in a plan view.

In response to this, the front and rear locking portions 8, 9 formed on the slat 6 comprise a front locking portion 8 formed on the slat surface portion 6g side and a rear locking portion 9 formed on the interlock connection portion Y side, and these front and rear locking portions 8, 9 are formed to be linearly symmetrical with the curtain core Z of the shutter curtain 3 as the axis of symmetry when viewed in a plane. In other words, the front and rear locking portions 8, 9 are groove-shaped (V-shaped in this embodiment) that open outward in the front-to-rear direction when viewed in a plane, and are formed in approximately the same linearly symmetrical shape at approximately the same position in the left-to-right direction.

First, the front engagement portion 8 will be described. The front engagement portion 8 is configured as a long hole cut out in the vertical direction from the slat surface portion 6g through the upper and lower bent portions 6e, 6f to the midpoints of the upper and lower inclined piece portions 6c, 6d.
Specifically, the front engagement portion 8 is formed continuously in the vertical direction by an intermediate engagement piece 8a formed across the entire vertical width of the slat surface portion 6g, and upper and lower engagement pieces 8b, 8c formed on the upper and lower inclined surface portions 6c, 6d, and the intermediate engagement piece 8a is formed in such a manner that the inner and outer left and right pieces 8aa, 8ab are long vertically parallel linear cutout holes extending between the upper and lower bent portions 6e, 6f.

In contrast, the upper and lower locking pieces 8b, 8c are formed so that the left-right inner and outer pieces 8ba, 8ca, 8bb, 8cb, which are continuous with the left-right inner and outer pieces 8aa, 8ab of the intermediate locking piece 8a, extend up to the upper and lower bottom pieces 8bc, 8cc that reach the middle portions of the upper and lower inclined surface portions 6c, 6d.
In this case, the left-right outer piece portions 8bb, 8cb of the upper and lower locking pieces 8b, 8c are formed in a linear fashion continuing from the left-right outer piece portion 8ab of the intermediate locking piece 8a, whereas the left-right inner piece portions 8ba, 8ca are inclined pieces that are inclined outward in the left-right direction from the upper and lower bends 6e, 6f to the upper and lower bottom pieces 8bc, 8cc.
By being configured in this manner, when viewed in a plane, as shown in Figures 6 and 7, the front engagement portion 8 is formed as a V-groove-shaped, concave groove-like cutout hole in which the left-right inner and outer pieces 8aa, 8ab of the intermediate engagement piece 8a form long (wide) groove opening ends in the vertical direction, the left-right inner and outer pieces 8ba, 8ca, 8bb, 8cb of the upper and lower engagement pieces 8b, 8c form groove side pieces common to both the upper and lower sides, and the upper and lower bottom pieces 8bc, 8cc form a groove bottom common to both the upper and lower sides.
Moreover, the front engagement portion 8, which is formed in a groove shape in a plan view, is configured such that the outer piece 8bb in the left-right direction is at a right angle to the shutter core Z, and the inner piece 8ba is at an angle β, as shown in Figure 7.

In contrast, the rear engagement portion 9 is formed in the interlock connection portion Y and is configured in a front-to-back overlapping state with a first engagement hole 9a formed in the upper connection half 6a which constitutes the outer skin (outer part) of the interlock connection portion Y and a second engagement hole 9b formed in the lower connection half 6b which constitutes the inner skin (inner part).
In this regard, as for the rear engagement portion 9, for example, if the lower connecting half 6b has a small diameter and does not affect the anti-slip engagement of the rear engagement receiving portion 7 as described below, the present invention can be implemented even if the second engagement hole 9b is not formed in the lower connecting half 6b.

The outer first locking hole 9a is formed by cutting out the rear half of the upper joint half 6a in a groove shape, and is formed in a V-groove shape in a plan view with the left-right inner and outer pieces 9aa, 9ab and the upper and lower first bottom pieces 9ac, as shown in Fig. 7. In this case, the left-right outer piece 9ab is formed at a right angle to the curtain core Z, as shown in Fig. 7, while the left-right inner piece 9aa is configured to have an angle β with respect to the curtain core Z. In this way, the first locking hole 9a is configured so that the groove width is expanded inward in the left-right direction toward the groove opening side, thereby forming the basic shape of the rear locking part 9. The first locking hole 9a configured in this way is configured in a line-symmetric shape with respect to the front locking part 8 in a plan view with the curtain core Z as the axis of symmetry.
In this embodiment, the angle α of the left-right inner piece 7a of the front and rear engagement receiving portion 7 provided on the guide rail 2 relative to the curtain core Z is set to be larger than the angle β of the left-right inner pieces 8aa, 9aa of the front and rear engagement portions 8, 9 relative to the curtain core Z (α < β).

On the other hand, the inner second engagement hole 9b formed in the lower connecting half 6b is formed in a rectangular hole shape by upper and lower hole piece portions 9ba, 9bb and left and right hole piece portions 9bc, 9bd, and when viewed in a plane, the upper and lower hole piece portions 9ba, 9bb become the second bottom piece of the second engagement hole 9b and are located in the same position. However, when the slats 6 are in the normal closed position described above, as shown in Figures 9 and 11 (A), the hole piece portions 9ba, 9bb which become the upper and lower second bottom pieces are located rearward of the first bottom piece portion 9ac of the first engagement hole 9a, and the left and right hole piece portions 9bc, 9bd are formed in a state where they are wider in the left-right direction than the inner and outer piece portions 9aa, 9ab of the first engagement hole 9a.
The left and right hole piece portions 9bc, 9bd of the second locking hole 9b have a left-right width set so that when the slats 6 arranged to be crimped together as described above move relative to each other left and right, the second locking hole 9b is approximately located (included) within the range (area) of the first locking hole 9a. This ensures that when the slats 6 are misaligned left and right, the left and right inner and outer piece portions 9aa, 9ab of the first locking hole 9a are not covered by the left and right hole piece portions 9bc, 9bd of the second locking hole 9b.

In contrast, the upper and lower hole pieces 9ba, 9bb that form the second bottom piece of the second locking hole 9b are located rearward of the first bottom piece 9ac of the first locking hole 9a when the slats 6 are in the normal closed position as shown in Figures 9 and 10 (A) (in this state, the upper and lower hole pieces 9ba, 9bb of the second locking hole 9b form the bottom piece of the rear locking portion 9). However, as described above, when the slats 6 move relative to each other in the front-to-rear direction, they are configured to be located in approximately the same position as the first bottom piece 9ac of the first locking hole 9a, as shown in Figure 11 (B).

As mentioned above, it is known that the slat 6, which has the upper and lower connecting halves 6a, 6b, the inclined surface portions 6c, 6d, and the slat surface portion 6g, is formed by roll forming a strip-shaped steel plate S, and this technology is known, for example, in JP-A-8-60953.
In the case where the front and rear locking portions 8, 9 are formed on the roll-formed slat 6 in this manner, it is practically difficult to perform processing such as punching to form the locking portions 8, 9 on the roll-formed slat 6 because the slat 6 already has a three-dimensional structure. Therefore, in the present embodiment, the long flat strip steel plate S supplied when the slat 6 is roll-formed is formed with the locking hole 8x corresponding to the front locking portion 8 and the first and second locking holes 9x, 9y corresponding to the first and second locking holes 9a, 9b constituting the rear locking portion 9 by punching (pressing) at the first stage of roll-forming as shown in the development view of the slat 6 shown in Fig. 8(C), and then the slat 6 is formed by roll-forming into the required shape, so that the front and rear locking portions 8, 9 having a three-dimensional structure can be formed easily and accurately.
Incidentally, with regard to the first engagement hole 9a, the inner left-right piece 9aa is formed in a V-shape with an apex 9aaa on the inside left-right side so as to correspond to the inner left-right piece 8ba, 8ca of the front engagement portion 8, and the outer left-right piece 9ab is formed as an extension of the outer left-right piece 8ab of the front engagement portion 8.

Next, in the shutter device 1 thus configured, when the shutter curtain 3 is bent in the forward/backward direction due to strong winds of positive or negative pressure, the front and rear engaging portions 8, 9 engage with the corresponding front and rear engaging receiving portions 7 to prevent the shutter curtain 3 from coming loose, and conversely, the bent shutter curtain returns to its original state, causing the engaging portions 8, 9 to come loose from the engaging receiving portions 7.
Incidentally, in the field of shutter devices, the wind pressure when a shutter curtain is bent toward the rear (indoor side) due to a strong wind from the front (outdoor side) is referred to as "positive pressure," and conversely, the wind pressure when a shutter curtain is bent toward the front (outdoor side) due to a strong wind (draw wind) from the rear (indoor side) is referred to as "negative pressure," and these terms will be used in the following explanation.

As mentioned above, the front and rear locking receiving portions 7 and the front and rear locking portions 8 and 9 formed on the guide rail 2 and the shutter curtain 3 are, in the normal state, all formed in line symmetry with the curtain core Z as the axis of symmetry, as shown in Figure 7 when viewed in a plane. In other words, when viewed in a plane, they are in approximately the same position and shape in the left-right direction, and are mirror-symmetrical from front to back.
When the slat 6 is in this normal closed position, the front and rear engagement portions 8, 9 formed on the left and right end edges of the slat 6 are loosely fitted and positioned outward in the left and right direction from the engagement receiving portion 7 (at the back of the guide groove X).

When the shutter curtain 3 in such a normal state is swung back and forth by the wind, the curtain surface 3a or 3b comes into contact with the locking receiving portion 7 on the swung side, but if the wind is strong, the shutter curtain 3 becomes inclined with the center portion bent back and forth, and the swallowing allowance (insertion depth) of the shutter curtain 3 in the guide rail becomes shallow. As a result, the shutter curtain 3 moves inward in the left and right direction out of the guide groove X with the left and right edge portions inclined back and forth.
If this movement becomes larger due to a strong gust of wind, as shown in Figure 12, when the locking portion 8 or 9 on the deflected side reaches the locking receiving portion 7 on that side, the shutter curtain 3 moves in the direction in which the locking portion 8 or 9 fits externally into the locking receiving portion 7, and as a result, the shutter curtain 3 is prevented from slipping out from the guide rail 2 with the locking portion 8 or 9 locked into the locking receiving portion 7.
In this way, in the present embodiment, when the shutter curtain 3 is bent by a strong wind, whether the strong wind is positive or negative pressure, the locking portions 8 or 9 formed on both the front and rear sides of the shutter curtain 3 will lock into the locking receiving portions 7 formed on the guide rail 2 side, thereby ensuring that the shutter curtain 3 is not pulled out without the need for separate components such as wind-resistant hooks.

When the bent shutter curtain 3 is prevented from slipping out in this manner, the locking receiving portion 7 is fitted into the locking portion 8 or 9. In this case, the shutter curtain 3 is in an inclined position, bent in the front-to-rear direction. As a result, the tip edge 7c of the locking receiving portion 7 is deeply fitted into the locking portions 8 and 9, and the corresponding front and rear curtain surfaces 3a or 3b of the shutter curtain 3 have a two-point support structure in which the tip edge 2cd of the inner piece 2ca of the cushioning attachment portion 2c serves as the slat support portion. As a result, further bending deformation is restricted at the locking portion of the shutter curtain 3, and the prevention of the shutter curtain 3 from slipping out of the guide rail 2 is further strengthened.

Moreover, in this embodiment, with regard to the rear engagement portion 9, when the shutter curtain 3 is in its normal state (the state shown in Figure 11 (A)) and the engagement receiving portion 7 is fitted into the rear engagement portion 9, and the rear curtain surface 3b abuts the tip edge 7c of the outer piece 2cb to prevent it from coming loose, the tip edge 7c of the engagement receiving portion 7 does not reach the first bottom piece 9ac of the first engagement hole 9a of the rear engagement portion 9, but is configured to be in a position that is closely opposed to or abuts the upper and lower hole pieces 9ba, 9bb that form the bottom piece of the second engagement hole 9b.
In such a configuration, as described above, when the slats 6 move relative to each other in the fore-and-aft direction, and the first bottom piece 9ac of the first locking hole 9a of the rear locking portion 9 and the upper and lower hole pieces 9ba, 9bb that form the bottom pieces of the second locking hole 9b are positioned in approximately the same position in a planar view (the state of Figures 11 (B) and 13 (A)), the tip edge 7c of the locking receiving portion 7 is in close proximity to or in contact with the first bottom piece 9ac of the first locking hole 9a of the rear locking portion 9 and the upper and lower hole pieces 9ba, 9bb that form the bottom pieces of the second locking hole 9b, which are positioned in approximately the same position, thereby reliably preventing the shutter curtain 3 from coming loose.
By configuring in this manner, the upper and lower hole piece portions 9ba, 9bb, which form the bottom piece of the second engagement hole 9b, are positioned rearward in the fore-and-aft direction from the first bottom piece portion 9ac of the first engagement hole 9a in the normal state, so that the upper hole piece portion 9ba, which is on the side of the leading edge 6bb of the upper engagement half portion 6b (the lower edge Sa of the steel plate S when the slat 6 is unfolded as shown in Figure 8 (C)), has a distance (width) from the leading edge 6bb.As a result, it is possible to avoid the strength of the upper hole piece portion 9ba becoming weaker, as would occur if the upper hole piece portion 9ba were brought close to the leading edge 6bb and positioned in the same position as the first bottom piece portion 9ac of the first engagement hole 9a in the normal state, and this contributes to increasing the strength of the rear engagement portion 9.

Moreover, as described above, in the locked state where the shutter curtain 3 is prevented from slipping out of the guide rail 2, the position where either the front or rear locking portion 8 or 9 fits into the corresponding locking receiving portion 7 is located further back in the groove than the opening edge of the guide rail 2, and the front and rear locking portions 8, 9 are located further back in the groove than the opening end of the guide groove X. As a result, in the locked state where the shutter curtain 3 is prevented from slipping out, the locking portions 8, 9 do not protrude from the opening end of the guide groove X toward the opening E and are not visible from the outside.

Furthermore, in this embodiment, when the front locking portion 8 is fitted into the locking receiving portion 7 on that side to prevent it from slipping out, as described above, the tip 7c of the locking receiving portion 7 comes into contact with the corner between the hole bottom pieces 8bc, 8cc of the front locking portion 8 and the left-right outer pieces 8bb, 8cb to be locked, and the tip edge 2cd of the inner piece of the cushioning attachment portion 2c becomes the slat support portion and the front curtain surface 3a comes into contact with it, resulting in a two-point support state in plan view. In addition, the left-right inner piece 8aa, which is the opening end corner portion of the front locking portion 8, can also come into contact with the inner piece 7a of the locking receiving portion 7 to provide a three-point support state in plan view, resulting in an even more reliable support for preventing the shutter curtain 3 from slipping out and increased strength.

As described above, when the shutter curtain 3 is subjected to positive and negative pressure and is prevented from slipping out, the wind weakens, and the like, and the locking parts 8, 9 slip out of the locking receiving part 7. In this case, as described above, the angle α of the vertical inner piece 7a of the front and rear locking receiving part 7 relative to the curtain core Z is larger than the angle β of the vertical inner piece 8aa, 9aa of the front and rear locking parts 8, 9 relative to the curtain core Z (α < β). As a result, in this return process, as shown in Figures 14 and 15, the inclined inner piece 7a of the locking receiving part 7 is guided in a sliding contact state by the left-right inner piece 8aa, which is the left-right inner opening edge of the front locking part 8, and the apex 9aaa, which is the left-right inner opening edge of the rear locking part 9. This allows the inner piece 7a to become an inclined guide receiving surface during return and to come out while being guided in sliding on the inclined surface. As a result, it becomes easy for the locking parts 8, 9 to come out of the locking receiving part 7.

In this way, in the return process in which the locking portions 8, 9 come out of the locking receiving portion 7, the sliding guide on the inclined surface can be set as in the second embodiment shown in FIG. 16, where the angle α of the vertical inner piece 7a of the front and rear locking receiving portion 7 relative to the curtain core Z and the angle β of the vertical inner piece 8aa, 9aa of the front and rear locking portions 8, 9 relative to the curtain core Z are smaller than the angle β on the front and rear locking portions 8, 9 side (α>β), as opposed to the first embodiment. In this case, the tip edge 7c of the locking receiving portion 7 and the inclined left-right inner piece 8ba, 8ca of the locking portion 8 act as inclined guide surfaces, providing smooth return guidance in an inclined state.

In the embodiment of the present invention configured as described above, when the shutter curtain 3 is bent by a strong wind, the bent shutter curtain 3 is prevented from falling off by the locking parts 8 and 9 formed on the slat 6 engaging with the locking receiving part 7 provided on the guide rail 2. When the shutter curtain 3 is bent forward by negative pressure, the front locking part 8 engages with the front locking receiving part 7 to prevent the shutter curtain 3 from falling off. In this case, the locking part 8 formed on the slat surface part 6g extends not only to the slat surface part 6g, but also beyond the upper and lower bent parts 6e and 6f to the upper and lower inclined surface parts 6c and 6d. As a result, the locking part 8 has a deep groove that reaches from the bent parts 6e and 6f to the inclined surface parts 6c and 6d in a plan view, and the locking parts 6e and 6f do not get in the way as in the conventional case, and the locking part 8 can be smoothly locked to the locking receiving part 7.

In addition, in this case, the upper and lower hole bottoms 8bc, 8cc that form the groove bottom of the front locking portion 8 are formed in the middle of the inclined surface portions 6c, 6d. As a result, the front locking portion 8 is elongated and formed to reach the inclined surface portions 6c, 6d, but it is stronger than if the front locking portion 8 was formed across the entire width of the inclined surface portions 6c, 6d, and a highly reliable locking mechanism is achieved to prevent it from coming loose.

Furthermore, in the front engagement portion 8, the left-right inner pieces 8ba, 8ca formed on the upper and lower inclined surface portions 6c, 6d are formed in an inclined manner that is biased outward in the left-right direction from the upper and lower bent portions 6e, 6f toward the bottom pieces 8bc, 8cc which form the bottom of the groove, relative to the left-right inner piece 8aa formed on the slat surface portion 6g when viewed in a plane, making it easy to make the front engagement portion 8 wider toward the groove opening side.
Furthermore, the front engagement portion 8, whose inner side is inclined in the left-right direction, has groove openings formed on the inner and outer left-right pieces 8aa, 8ab formed on the slat surface portion 6g, and the inner and outer left-right pieces 8ba, 8ca, 8bb, 8cb formed on the upper and lower inclined surface portions 6c, 6d become groove side pieces of the front engagement portion 8. As a result, the front engagement portion 8, which has a concave groove shape when viewed in a plane, can effectively utilize the inclined surfaces of the inclined surface portions 6c, 6d, thereby simplifying the structure.

Incidentally, when the left-right inner piece of the front locking portion 8 is formed in an inclined shape, it is not limited to being formed only up to the bent portions 6e, 6f of the upper and lower inclined surface portions 6c, 6d, but can be formed to extend beyond the bent portions 6e, 6f and reach the slat surface portion 6g. In this way, the inclined portion of the front locking portion 8 does not extend to the midpoint of the inclined surface portions 6c, 6d, and there is no step between the midpoint and the bent portions 6e, 6f, and the locking receiving portion 7 can be smoothly released.

The present invention is of course not limited to the above-described embodiments. For example, as in the third embodiment shown in FIG. 18, the locking portions 8 and 9 may be square-shaped rather than V-shaped in plan view, and the locking receiving portion 7 may be square-shaped rather than triangular in plan view. Needless to say, these shapes can be of various shapes as needed, as long as they function as locking portions and locking receiving portions.

The present invention can be used as a slat in a shutter device for buildings that is installed in openings such as entrances and exits of buildings such as buildings and houses.

1 Shutter device 2 Guide rail 2c Cushioning material mounting portion 2ca Inner piece portion 2cb Outer piece portion 2cc Mounting groove 2cd Tip edge portion 3 Shutter curtain 3a Front curtain surface 3b Rear curtain surface 4 Roll-up body 5 Cushioning material 6 Slat 6a Upper joint half portion 6b Lower joint half portion 6c Upper inclined surface portion 6d Lower inclined surface portion 6e Upper bent portion 6f Lower bent portion 6g Slat surface portion 7 Locking receiving portion 7a Inner piece portion 7b Outer piece portion 7c Tip portion 8 Front locking portion 8a Middle locking piece portion 8aa, 8ab Left-right inner and outer pieces 8b, 8c Upper and lower locking pieces 8ba, 8ca Left-right inner piece portion 8bb, 8cb Left-right outer piece portion 8bc, 8cc Upper and lower bottom pieces 9 Rear locking portion 9a First locking hole 9aa Left-right inner piece 9ab Left-right outer piece 9ac Bottom piece 9b Second locking hole 9ba, 9bb Top-bottom hole piece 9bc, 9bd Left-right hole piece X Guide groove Y Interlock connection portion Z Curtain core

Claims (5)

The shutter curtain is provided with guide rails on the left and right sides of the opening, a shutter curtain is guided up and down with both left and right end portions fitted into guide grooves of the guide rails to open and close the opening, and a winding body is provided above the opening to wind up the shutter curtain,
In a building shutter device, the shutter curtain is prevented from slipping off the guide rail when it is bent in the forward and backward directions due to strong winds by a locking portion provided on the slats constituting the shutter curtain being locked into a locking receiving portion provided in the guide groove.
The slats are configured to include a slat surface portion disposed on the front side, upper and lower connecting half portions disposed on the rear side to connect adjacent slats by an interlocking connection, and upper and lower inclined surface portions that connect the front slat surface portion and the upper and lower connecting half portions on the rear side at an angle,
The slat is configured such that a locking portion for locking the locking receiving portion formed on the opening end edge of the guide groove is formed on the slat surface in a concave groove shape that is open outward in the front-rear direction in a plan view,
A slat in a shutter device for a building, characterized in that the engaging portion has an inner piece in the left-right direction that is biased outward in the left-right direction toward the bottom of the groove of the engaging portion, and the part that becomes wider inward in the left-right direction toward the opening end of the engaging portion extends from the slat surface portion over the upper and lower bends to the upper and lower inclined surface portions. The slat in the shutter device for buildings described in claim 1, characterized in that the engagement portion is a vertical hole that is long in the vertical direction and reaches the bottom of the hole formed in the middle of the upper and lower inclined surface portions. The slat in the building shutter device described in claim 2 is characterized in that the portion formed on the upper and lower inclined surface portion of the engagement portion is formed in such a way that the inner left and right pieces are biased outward in the left and right direction from the upper and lower bends toward the bottom of the groove, relative to the portion formed on the slat surface portion of the engagement portion when viewed in a plane. A slat in a shutter device for buildings as described in claim 3, characterized in that the portion of the engagement part formed on the slat surface portion corresponds to the groove opening of the engagement part, and the portion formed on the upper and lower inclined surface portions corresponds to the groove side piece of the engagement part. A slat in a shutter device for buildings as described in claim 4, characterized in that the inclined piece formed on the left-right inner piece of the engagement part is extended beyond the upper and lower bends to reach the slat surface part.

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