Reinforcement structure for central column in building shutter system

Abstract

To reinforce the lower end part of a center pillar 3 that guides the adjacent edges of shutter curtains 4 in a connected shutter device in which the shutter curtains 4 are arranged on the left and right sides.SOLUTION: By disposing a reinforcing part 10c of a reinforcing material 10 fixed to a center pillar body part 3a on the indoor side of a rod leg part 8a, a center pillar 3 comes into contact with a floor plate 6 and receives the bending stress when bent indoors for reinforcement when the center pillar 3 bends inside by receiving bending stress as a shutter curtain 4 is bent by strong winds.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to the technical field of a reinforcing structure for a middle column in a continuous type of shutter device for buildings, where shutter curtains are provided side by side on the left and right.

Background Art

[0002] Generally, in order to open and close openings such as entrances and exits of buildings such as buildings and warehouses, a shutter device for buildings that is opened and closed by a shutter curtain may be installed. Among such shutter devices, when the lateral opening width (left and right opening width) of the opening is wide, a middle column is removably provided at the middle part in the left and right direction of the opening, and a so-called continuous type is adopted in which the shutter curtain is opened and closed on both the left and right sides sandwiching the middle column. In such a continuous type of shutter device, when the shutter curtain in the closed posture is bent in the indoor-outdoor direction under strong winds during severe weather such as typhoons, the middle column will also bend in the indoor-outdoor direction under the bending stress (load) of the shutter curtain. By the way, the middle column is attached in an independent standing state at the middle part in the left and right direction of the opening, different from the left and right guide rails attached to the building body side. Since it becomes an obstacle when the shutter curtain is opened, it is configured to be removable (detachable). Therefore, on the finding surface on one side in the indoor-outdoor direction (for example, the indoor side) of the middle column, a case body having a gap in the vertical direction with respect to the floor surface of the opening, and a vertically movable rod body that freely fits through a rod through-hole formed in the lower surface plate of the case body are provided. By fitting the rod body into a rod receiving hole formed in a floor plate provided on the floor surface of the opening, the lower end portion of the middle column in the standing posture can be attached and supported on the floor surface side of the opening (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

[0004] However, in the conventional system described above, the rod body provides reliable support to the floor side of the lower end of the central column. However, as mentioned above, when the shutter curtain is deflected by strong winds, the central column will also bend under the resulting deflection stress. If the direction of this deflection of the central column is one side of the indoor / outdoor direction where the case body is provided (indoor side), unlike the outdoor side where the central column itself can contact the floor plate (or opening floor surface) to receive the deflection stress, there is nothing to contact the floor plate (or opening floor surface) to receive the deflection stress. As a result, the central column will bend to one side (indoor side) in response to the deflection stress it receives, which may cause deformation and damage to the central column and related components. These are the problems that the present invention aims to solve. [Means for solving the problem]

[0005] The present invention was created in view of the above circumstances and with the aim of solving these problems, and the invention of claim 1 is a building shutter device comprising left and right guide rails provided at both left and right edges of an opening such as an entrance that separates the inside and outside, a central column detachably provided in the middle of the opening in the left-right direction, and a shutter curtain that moves to open and close the opening guided by the guide rails and the central column, wherein the shutter curtain is installed in a series on the left and right with the central column in between, and a case is provided on the visible surface on one side in the indoor-outdoor direction of the lower end of the central column in a state that there is a gap with respect to the floor surface of the opening This is a reinforcement structure for a central column in a building shutter device, characterized in that a body is provided, and a rod body is provided in the case body that can be moved up and down so as to protrude below the lower end edge of the central column, while a rod receiving hole is provided in a floor plate provided on the floor surface of the opening into which the downwardly protruding rod body is fitted, thereby providing mounting support for the lower end of the central column to the floor surface of the opening, and a reinforcing member is provided at the lower end of the central column that is in close proximity to the floor plate on the outer side of one side of the rod body in the indoor / outdoor direction, and that contacts the floor plate and receives bending stress when the central column bends in one side in the indoor / outdoor direction. The invention of claim 2 is a reinforcing structure for a central column in a building shutter device according to claim 1, characterized in that the reinforcing member comprises a fixing portion fixed to the visible surface on one side of the central column and a reinforcing portion that is in close proximity to the rod body on the outside in the indoor / outdoor direction, and the bending stress received by the reinforcing portion when it comes into contact with the floor plate is received by the central column via the fixing portion. The invention of claim 3 is a reinforcing structure for a central column in a building shutter device according to claim 2, characterized in that the rod body has a U-shape with a pair of left and right rod legs and an upper rod strut, the rod legs are fitted into rod receiving holes, the fixing part is fixed to the central column in a state where it is positioned between the left and right rod legs, and the reinforcing part is formed by bending outwards in the left and right direction from the tips of extensions that extend from both left and right ends of the fixing part toward one side in the indoor / outdoor direction. The invention of claim 4 is a reinforcing structure for a central column in a building shutter device according to claim 3, characterized in that the lower plate of the case body has a rod through-hole formed therein that is larger in diameter than the rod leg, the rod leg passes through the rod through-hole in a loosely fitted state with a gap, at least one of the central column and the rod leg is provided with a projection to make the gap smaller than the gap between the rod through-hole and the rod leg, and when the central column bends to one side in the indoor / outdoor direction, the central column and the rod body come into contact via the projection at a stage before the rod body comes into contact with the rod through-hole. The invention of claim 5 is a reinforcing structure for a central column in a building shutter device according to claim 3, characterized in that the lower plate of the case body has a rod through-hole formed therein that is larger in diameter than the rod leg, the rod leg passes through the rod through-hole in a loosely fitted state with a gap, the reinforcing part is configured to face the rod leg at a distance smaller than the gap between the rod through-hole and the rod leg, and the reinforcing part and the rod body come into contact at a stage before the rod body comes into contact with the rod through-hole when the central column bends to the other side in the indoor / outdoor direction. [Effects of the Invention]

[0006] By adopting the invention of claim 1, in a multi-unit shutter device, when the central column bends in one direction (indoors or outdoors) due to the shutter curtain bending in strong winds, the reinforcing material comes into contact with the floor plate and receives bending stress. As a result, the bending of the central column in that direction is reduced, preventing deformation of the central column-related members and thus reinforcing the central column. By adopting the invention of claim 2, the reinforcing member that contacts the floor plate on the outer side of the rod body on one side in the indoor / outdoor direction and receives bending stress when the central column bends to one side in the indoor / outdoor direction can be constructed with a simple structure comprising a fixing part fixed to the visible surface on the aforementioned one side of the central column and a reinforcing part that is in close proximity to the rod body on one side in the indoor / outdoor direction. By adopting the invention of claim 3, when the rod body is provided with a pair of left and right rod legs, the reinforcing member is fixed to the central column with the fixing portion positioned between the left and right rod legs, and the reinforcing portion is bent outward in the left and right direction from the tips of the extensions that extend from both the left and right ends of the fixing portion toward one side in the indoor / outdoor direction. As a result, the reinforcing portion can be firmly fixed to the central column while being in close proximity to the rod body toward one side in the indoor / outdoor direction, thereby improving the reinforcing effect. By adopting the invention of claim 4, when the central column bends to one side in the indoor / outdoor direction, the central column and the rod body come into contact via the projection before the rod body comes into contact with the rod through hole. As a result, it is possible to prevent problems such as deformation of the rod through hole due to bending stress acting on it as the rod body comes into contact with it. By adopting the invention of claim 5, when the central column bends to the other side in the indoor / outdoor direction, the reinforcing part and the rod body come into contact with each other before the rod body comes into contact with the rod through hole. As a result, it is possible to prevent problems such as deformation of the rod through hole due to bending stress acting on it when the rod body comes into contact with it. [Brief explanation of the drawing]

[0007] [Figure 1] This is a rear view of the shutter device. [Figure 2] This is a side view of the shutter mechanism. [Figure 3] (A) and (B) are the rear and side views of the central column. [Figure 4] (A) and (B) are the plan view and base view of the central column. [Figure 5] (A) and (B) are rear and side views of the lower end portion of the central column. [Figure 6] (A) and (B) are rear and side views showing the lower end of the central column fixed with a rod. [Figure 7] (A), (B), and (C) are rear, side, and bottom views of the case body with the reinforcing material removed. [Figure 8] (A), (B), and (C) are the rear view, top view, and side view of the reinforcing material. [Figure 9] (A) and (B) are side and bottom views of the lower end portion of the central column when it is in its normal state. [Figure 10] (A) and (B) are side and bottom views of the lower end portion of the central column when it is bent inward towards the interior. [Figure 11] (A) and (B) are side and bottom views of the lower end portion of the central column when it is bent outwards. [Modes for carrying out the invention]

[0008] The embodiments of the present invention will now be described based on the drawings. In the drawings, 1 is a shutter device for a building that is installed in an opening E which is an entrance to a building such as a building. The shutter device 1 is a left and right linked type and is configured as a manual type using various components and devices such as guide rails 2 provided on both the left and right sides of the opening E, a central column 3 that is removablely provided in the middle of the opening E in the left-right direction, shutter curtains 4 that are linked on the left and right so that the opening E can be opened and closed by the guide rails 2 and central column 3, and a winding body 5 positioned above the opening E on which the left and right shutter curtains 4 are wound separately. All of these are conventional, and the specific structure of the central column 3 will be described in detail below. Incidentally, the shutter device is not limited to manual operation; it can also be electrically operated, as long as an electric opener is used to automatically wind and unwind the shutter curtain 4.

[0009] The central column 3 is formed in an elongated shape in the vertical direction, and its upper end is supported by being removably fitted into a structural member K such as a lintel provided above the opening, while its lower end is provided in close proximity to or in contact with a floor plate 6 which is provided so as to be substantially flush with the floor surface F in the middle of the opening E in the left-right direction. The central pillar 3 is composed of a central pillar main body 3a in which a pair of left and right guide grooves 3aa that open with the outer sides in the left and right directions being groove openings are formed, and a case body 7 provided on the finding surface 3b on the indoor side of the central pillar main body 3a. And the edge portions on the adjacent sides of the shutter curtains 4 connected in series left and right are configured to be loosely fitted into the respective guide grooves 3aa to guide the opening and closing of the edge portions on the corresponding sides of the shutter curtains 4. Incidentally, S is the curtain core of the shutter curtain.

[0010] On the finding surface 3b on the indoor side (one side) in the indoor-outdoor direction at the lower end of the central pillar 3, the case body 7 is attached in a state of facing upward with respect to the floor plate 6, and the rod body 8 is assembled to the case body 7 in a state where it can be vertically moved. Incidentally, the case body 7 may be attached to the outdoor side if necessary. The case body 7 has a rectangular box shape including an upper face plate 7a, a lower face plate 7b, a front face plate 7c, a back face plate 7d, and left and right side face plates 7e, and the lower face plate 7b is provided with a gap with respect to the floor surface F.

[0011] On the other hand, the rod body 8 has a U-shaped cross-section including a pair of left and right rod legs 8a that are loosely fitted through through holes 7aa and 7ba provided in the upper and lower face plates 7a and 7b, and a rod straddle portion 8b disposed above the upper face plate 7a of the case body. And the rod body 8 is configured to be vertically movable between an open posture (upper movement posture) where the lower edge portion​Incidentally, the rod body 8 is biased toward the open posture by the biasing force of a spring mechanism (not shown) provided inside the case body 7. Further, the rod body 8 is maintained in the fixed posture by a locking means (not shown) provided inside the case body 7 at a timing corresponding to the operation to the fixed posture. By operating the release knob 9 provided on the front panel 7c of the case body 7, the maintenance of the fixed posture is released, and it is configured to automatically return to the release posture under the influence of the biasing force. However, all such configurations adopt general-purpose technologies, and the details thereof are omitted because they are not directly related to the present invention.

[0012] On the other hand, on the upper and lower face plates 7a and 7b of the case body 7, upper and lower extension plates 7f and 7g extending in the vertical direction in a state flush with the back panel 7d are formed. The upper extension plate 7f is attached and fixed to the column finding surface 3b of the case body 7 by fastening via a fastener 7h such as a bolt. Further, as will be described later, the lower extension plate 7g can be attached and fixed to the column finding surface 3b in a state where it is applied together with a reinforcing member 10 via a fastener 10aa. Further, from the lower edge of the lower extension plate 7g of the case body 7, a bottom plate portion 7i extends toward the other side in the indoor / outdoor direction, and the lower edge of the column main body portion 3a abuts thereon to form a substantially bottom face plate (lower face plate) of the column 3. When the column 3 is set upright in the opening E, the column 3 is configured to be supported in a state where the bottom plate portion 7i abuts on the floor plate 6.

[0013] On the other hand, 10 is a reinforcing member in which the present invention is implemented. The reinforcing member 10 includes a fixing portion 10a, an extending portion 10b, and a reinforcing portion 10c. The fixing portion 10a is arranged between the lower face plate 7a of the case body and the floor plate 6 (opening floor F) and is positioned between the left and right rod legs 8a. The fixing portion 10a is fixed to the column 3 via a fastener 10aa such as a screw that penetrates the lower extension plate 7g in a state where it is applied (abutted) to the lower extension plate 7g. The extending portion 10b is formed to extend in an expanding manner toward one side in the indoor / outdoor direction while passing through the inner sides in the left-right direction of the left and right rod leg portions 8a from the left and right edge portions of the fixing portion 10a. Further, the reinforcing portion 10c is bent outward in the left-right direction from the tip edge of the extending portion 10b and extends outward in the left-right direction, so that a gap X exists between the reinforcing portion and the indoor side of the rod leg portion 8a and they are configured to face each other in proximity, and the lower end edge of the reinforcing portion is configured to face the floor plate 6 in proximity with a gap therebetween.

[0014] Furthermore, in this case, the diameter of the rod through-hole 7ba formed in the lower surface plate 7b of the case body is formed to be larger (thicker) than that of the rod leg portion 8a, and a play-like gap Y is formed between the rod through-hole 7ba and the rod leg portion 8a. However, the gap Y between the rod through-hole 7ba and the rod leg portion 8a is set to be larger than the gap X between the rod leg portion 8a and the reinforcing portion 10c (X < Y). Also, the lower extending portion 7g of the case body is fixed to the finding surface 3b of the middle column main body portion 3a, so that the middle column main body portion 3a and the rod leg portion 8a are configured to face each other with a gap substantially between the lower extending portion 7g and the rod leg portion 8a. However, in the present embodiment, a protrusion portion 7j is formed at a portion of the lower extending portion 7g facing the rod leg portion 8a so as to face the rod leg portion 8a with a gap Z therebetween. The gap Z between the rod leg portion 8a and the protrusion portion 7j is set to be smaller than the gap Y between the rod leg portion 8a and the rod through-hole 7ba (Z < Y). Thus, the middle column main body portion 3a and the rod leg portion 8a are configured to face each other in proximity through the gap Z due to the formation of the protrusion portion 7j. Incidentally, the gap Z between the rod leg portion 8a and the protrusion portion 7j and the gap X between the rod leg portion 8a and the reinforcing portion 10c are set to be approximately equal (X ≒ Z) or equal in dimension.

[0015] In this embodiment, when the shutter curtain 4 is fully closed and not subjected to strong winds, that is, when the shutter curtain 4 is not bending, the central column 3 stands upright in a vertical position, as shown in Figure 9, with the rod leg portion 8a loosely fitted through the rod through hole 7ba formed in the lower plate 7b of the case body. When the fully closed shutter curtain 4 is subjected to strong winds during severe weather such as a typhoon and bends in the direction of in-indoors or out-of-outdoors, the central column 3 will also bend in the direction of in-indoors or out-of-outdoors due to the bending stress of the shutter curtain 4. Generally, wind pressure in the direction that causes the shutter curtain 4 to bend inward is defined as positive pressure, and wind pressure in the direction that causes it to bend outward is defined as negative pressure.

[0016] When the deflection of the central column 3 is directed towards the indoor side due to the positive pressure, the central column 3 receives a deflection stress directed towards the indoor side at its vertical intermediate portion, causing the lower end of the central column 3 to shift towards the indoor side. As a result, as shown in Figure 10, the rod leg portion 8a comes into contact with the indoor-side peripheral edge 6aa of the rod receiving hole 6a, restricting further movement (shift), and the lower end of the central column 3 tilts with its upper side (vertical intermediate portion side) deflected towards the indoor side. When the lower end of the central column 3 tilts in this way, the indoor-side lower end edge 10ca of the reinforcing portion 10c comes into contact with the floor plate 6, receiving a deflection stress, and this deflection stress is further received by the central column body portion 3a via the fixing portion 10a, thereby reinforcing it. Moreover, at this time, the central column 3 is supported with the rod leg portion 8a in contact with the indoor peripheral edge 6aa of the rod receiving hole 6a, and as a result the central column body portion 3a shifts towards the indoor side, the gap Z between the rod leg portion 8a and the projection portion 7j is smaller than the gap Y between the rod leg portion 8a and the rod through hole 7ba, as mentioned above. As a result, the projection portion 7j comes into contact with the rod leg portion 8a before the rod through hole 7ba comes into contact with the rod leg portion 8a, thus preventing the rod leg portion 8a from strongly contacting the outdoor peripheral edge of the rod through hole 7ba, and thus preventing problems such as deformation of the rod through hole 7ba.

[0017] In contrast, if the deflection of the central column 3 is directed towards the outdoor side, which is subjected to negative pressure, the central column 3 will receive deflection stress directed towards the outdoor side at its vertical intermediate portion, causing the lower end of the central column 3 to shift towards the outdoor side. In this case, as shown in Figure 11, the rod leg portion 8a will come into contact with the outdoor peripheral edge 6ab of the rod receiving hole 6a, resulting in a supported state where further movement (shifting) is restricted. At the same time, the lower end of the central column 3 will tilt with its upper side (vertical intermediate portion side) deflected towards the outdoor side. As a result, the outdoor edge of the bottom plate portion 7i, which is the lower end of the central column 3 tilted towards the outdoor side, will come into contact with the floor surface F, receiving deflection stress and thus being supported and reinforced by the central column 3. Moreover, at this time, with the rod leg portion 8a in contact with the outdoor peripheral edge 6ab of the rod receiving hole 6a, the main body portion 3a of the central column shifts towards the outdoor side. As a result, as mentioned above, the gap X between the rod leg portion 8a and the reinforcing portion 10c is smaller than the gap Y between the rod leg portion 8a and the rod through hole 7ba. Consequently, the rod leg portion 8a comes into contact with the reinforcing portion 10c before the rod through hole 7ba comes into contact with the rod leg portion 8a. This prevents the rod leg portion 8a from strongly contacting the indoor peripheral edge of the rod through hole 7ba, thus preventing problems such as deformation of the rod through hole 7ba.

[0018] In this embodiment configured as described, in a double-mounted shutter device 1 with shutter curtains 4 arranged on the left and right, a case body 7 is provided on the indoor-facing surface 3b of the central column body 3a at the lower end of the central column 3, which is positioned between the left and right shutter curtains 4 and guides the opening and closing of the shutter curtains 4 together with the guide rails 2 on both the left and right sides. A rod body 8 is further provided on the case body 7, and by inserting the rod body 8 into a floor plate 6 provided on the opening floor surface F, the lower end of the central column 3 can be attached and supported to the opening floor surface F. In the shutter device 1 configured in this way, when the fully closed shutter curtain 4 is deflected by strong winds during severe weather such as a typhoon, the central column 3 will also deflect due to the resulting deflection stress. However, if the direction of deflection of the central column 3 is towards the indoor side, which is the case body 7 side, the reinforcing portion 10c of the reinforcing material 10, which is positioned on the lower side of the case body 7 and close to and facing the indoor side of the rod leg portion 8a, will come into contact with the floor plate 6 and receive the aforementioned deflection stress. As a result, the central column 3 will be reinforced to reduce the deflection in that direction, thereby protecting the central column 3 and related members.

[0019] In this case, the reinforcing member 10 comprises a fixing portion 10a fixed to the indoor-facing surface 3b of the main body portion 3a of the central column, and a reinforcing portion 10c that is in close proximity to and opposite the rod leg portion 8a on the indoor side. The bending stress received by the reinforcing portion 10c when it comes into contact with the floor plate 6 is then received by the main body portion 3a of the central column via the fixing portion 10a, thereby enabling more reliable reinforcement of the central column 3. Moreover, in this case, when the rod body 8 is provided with a pair of left and right rod legs 8a, the reinforcing member 10 is fixed to the main body 3a of the central column with the fixing part 10a positioned between the left and right rod legs 8a, and the reinforcing part 10c is bent outward in the left and right direction from the tips of the extensions 10b that extend inward from both left and right ends of the fixing part 10a. As a result, the reinforcing part 10c can be fixed firmly to the main body 3a of the central column while being in close proximity to the rod legs 8a from the indoor side, thereby improving the reinforcing effect.

[0020] Furthermore, in this design, the rod through-hole 7ba provided in the lower plate 7b of the case body 7 is formed to be larger in diameter than the rod leg portion 8a, and a gap Y exists between the rod through-hole 7ba and the rod leg portion 8a. However, the gap Z between the rod leg portion 8a and the projection 7j, and the gap X between the rod leg portion 8a and the reinforcing portion 10c are smaller than the gap Y. As a result, when the central column 3 is deflected in the indoor / outdoor direction due to the aforementioned bending stress, the rod leg portion 8a will come into contact with the projection 7j or the reinforcing portion 10c before the rod leg portion 8a comes into contact with the rod through-hole 7ba, thus avoiding the problem of deformation of the rod through-hole 7ba. [Industrial applicability]

[0021] This invention can be used as a reinforcing structure for a central column in a multi-unit building shutter system where shutter curtains are installed side by side. [Explanation of symbols]

[0022] 1. Shutter device 2 Guide rails 3 Middle pillar 3a Middle pillar main body 3b Indoor side facing surface 4. Shutter Curtain 5. Winding mechanism 6 Floor Plate 6a Rod receiving hole 7 Case Body 7a Top plate 7b Bottom plate 7ba rod through hole 7g Lower extension plate 7i Bottom plate part 7j protrusion 8 Rod Body 8a Rod leg 8b Rod saddle 10 Reinforcement material 10a Fixed part 10b Extension part 10c Reinforcement part 10ca lower edge E Opening F Floor X-rod leg section and reinforcement section gap Gap between the Y-rod leg and the rod through hole Gap between the Z projection and the rod leg

Claims

1. A building shutter device comprising left and right guide rails provided at both left and right edges of an opening such as a doorway separating indoors and outdoors, a central column detachably provided in the middle of the opening in the left-right direction, and a shutter curtain that moves to open and close the opening guided by the guide rails and central column, wherein the shutter curtain is installed in a series on the left and right with the central column in between, A case body is provided on the visible surface on one side of the lower end of the central column in the indoor / outdoor direction, with a gap between it and the floor surface of the opening, and a rod body is provided on the case body that can be moved up and down so as to protrude below the lower edge of the central column, The configuration involves providing a floor plate on the floor surface of the opening, into which a rod receiving hole is provided, into which the downwardly protruding rod body is fitted, thereby supporting the lower end of the central column on the floor surface side of the opening. A reinforcing structure for a central column in a building shutter device, characterized in that a reinforcing member is provided at the lower end of the central column, which is located in close proximity to the floor plate on the outer side of one side of the rod body in the indoor / outdoor direction, and which contacts the floor plate and receives bending stress when the central column bends in one side in the indoor / outdoor direction.

2. The reinforcing member comprises a fixing portion fixed to the visible surface on one side of the central column and a reinforcing portion that is in close proximity to the rod body on the outside in the indoor / outdoor direction, and is configured such that the bending stress received by the reinforcing portion when it comes into contact with the floor plate is received by the central column via the fixing portion, characterized in that the central column is a reinforcing structure for a central column in a building shutter device according to claim 1.

3. The rod body has a U-shape, comprising a pair of left and right rod legs and an upper rod strut, with the rod legs fitting into the rod receiving holes. The fixing part is fixed to the central column, positioned between the left and right rod legs. The reinforcing portion is formed by bending the tip of an extension that extends from both the left and right ends of the fixed portion toward one side in the indoor / outdoor direction toward one side toward the other, toward the left and right, toward the outward direction toward the left and right, characterized in that it is a reinforcing structure for a central column in a building shutter device according to claim 2.

4. The bottom panel of the case has rod through-holes formed in a larger diameter than the rod legs, through which the rod legs pass. The rod legs pass through the rod through-holes in a loosely fitted state with a gap between them. The reinforcing structure for a central column in a building shutter device according to claim 3, characterized in that at least one of the central column and the rod leg is provided with a projection to make the gap smaller than the gap between the rod through hole and the rod leg, and when the central column is bent to one side in the indoor / outdoor direction, the central column and the rod body come into contact via the projection at a stage before the rod body comes into contact with the rod through hole.

5. The bottom panel of the case has rod through-holes formed in a larger diameter than the rod legs, through which the rod legs pass. The rod legs pass through the rod through-holes in a loosely fitted state with a gap between them. The reinforcing portion is configured to face the rod leg at a distance smaller than the gap between the rod through hole and the rod leg, and is configured such that when the central column bends to the other side in the indoor / outdoor direction, the reinforcing portion and the rod body come into contact with each other before the rod body comes into contact with the rod through hole, characterized in that the central column reinforcing structure for a central column in a building shutter device according to claim 3.

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