JP6864410B1 - Jigs for shutters and how to build shutters - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig for a shutter which can be easily attached to a window. A jig M for a rain door is a first tubular portion 10 into which a square timber 91 is inserted and a second tubular portion 20 into which a square timber 92 is inserted, and is orthogonal to the first tubular portion 10. The second tubular portion 20 and the third tubular portion 30 into which the 93 square lumber is inserted, which are integrally formed so as to form a substantially L shape, are the first tubular portion 10 and the second tubular portion. It includes a third tubular portion 30 that is rotatably formed with respect to the tubular portion 20. Further, an expansion / contraction mechanism 50 that expands / contracts in the axial direction of the square lumber 93 inserted into the third tubular portion 30 and exerts a compressive force or a tensile force in the axial direction on the square lumber 93 inserted into the third tubular portion 30. It is preferable to prepare. [Selection diagram] Fig. 1

Description

The present invention relates to a jig for a shutter that can be easily attached to a window, and a method for constructing a shutter using the jig for the shutter.

(Trigger)
In recent years, heavy rains and typhoons, which are said to occur "once every 50 years," have frequently occurred, causing many casualties. Especially in the Kyushu region, "once every 50 years" occurs almost every year, and disasters occur in various places. In addition, disaster recovery has not been completed even after more than a year, and the building itself has become unusable.

(Installation status of shutters)
Shutters and shutters in large cities are often installed mainly from the viewpoint of crime prevention. There are many installation examples in rural areas in heavy snowfall areas, but few in urban areas. Therefore, some shutters that can be retrofitted to existing windows have also been developed.

As a retrofit shutter, for example, Patent Document 1 describes a framework composed of an existing bay window and a mounting jig (2), a rail (1), and a corner holding jig (4) for fixing the rail. It is disclosed. It is said that this framework can be used to create an appearance that meets the demands of consumers and to provide durable and reliable shutters to existing homes at low cost.

Japanese Unexamined Patent Publication No. 2000-96948

"Protecting the window" is basically protecting the glass. When a typhoon approaches and the windows are cured, air cushions and blue sheets may be taped. The problem in this case is that the material that covers the window is soft, and it does not provide protection when a hard object flies. In addition, soft materials are difficult to install due to the wind.

Originally, I would like to hit veneer etc. directly on the outer wall, but I will make a hole in the outer wall. It is psychologically difficult to hit the outer wall directly in case of a disaster that is not guaranteed to occur. How to create a "base" without damaging the outer wall is extremely important. Even in Patent Document 1 described above, the jig itself is fixed to the bay window by a screw or the like, and the outer wall is to be damaged.

Therefore, an object of the present invention is to provide a shutter that has relatively high strength and can be easily attached.

In order to achieve the above object, the jig for the shutter of the present invention is a first tubular portion into which the square timber is inserted and a second tubular portion into which the square timber is inserted, and the first tubular portion is inserted. A second tubular portion and a third tubular portion into which a square lumber is inserted, which are integrally formed so as to form a substantially L-shape perpendicular to the above, the first tubular portion and the second tubular portion. It includes a third tubular portion that is rotatably formed with respect to the tubular portion.

As described above, the jig for the shutter of the present invention is a first tubular portion into which the square timber is inserted and a second tubular portion into which the square timber is inserted, and is substantially orthogonal to the first tubular portion. A second cylinder portion integrally formed so as to form an L shape and a third cylinder portion into which a square lumber is inserted, which can be rotated with respect to the first cylinder portion and the second cylinder portion. It is provided with a third tubular portion, which is formed in. With such a configuration, by inserting a square timber into the jig for the shutter and attaching a face material to the square timber, a shutter that is relatively strong and can be easily attached without damaging the outer wall is provided. can do.

It is a front view of the jig for a shutter of an Example. It is explanatory drawing of the expansion / contraction mechanism of the jig for a shutter of an Example. (A) is a mechanism having a handle, and (b) is a mechanism having a nut portion. It is a front view explaining the state which inserted the square bar into the jig for a shutter. It is sectional drawing of the use state of the jig for a shutter. This is an example of using a jig for a shutter. (A) is an example of hooking on the outside, and (b) is an example of pulling from the inside. This is an example of arranging a jig for a shutter. (A) is an example of a vertically long window, (b) is an example of a horizontally long window, and (c) is an example of a large window.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the components described in the following examples are examples, and the technical scope of the present invention is not limited to them.

(Constitution)
First, the overall configuration of the jig M for the shutter of this embodiment will be described with reference to FIGS. 1 to 3. As shown in FIGS. 1 to 3, the jig M for the shutter is made of metal as a whole, and has a first tubular portion 10 into which the square timber is inserted and a second tubular portion into which the square timber is inserted. 20 is a second tubular portion 20 that is integrally formed so as to form a substantially L shape orthogonal to the first tubular portion 10, and a third tubular portion 30 into which a square timber is inserted. A third tubular portion 30 that is rotatably formed with respect to the first tubular portion 10 and the second tubular portion 20 is provided.

The first tubular portion 10 is, for example, a metal tubular member having an inner space cross section of 30 mm × 40 mm. Then, on one side surface (front surface) of the first tubular portion 10, three holes 11, 11, 11 for square timber and one hole 12 for face timber are spaced apart in the length direction. It is provided. For example, a square lumber 91 having a cross section of 30 mm × 40 mm is inserted into the insertion portion 10a inside the first tubular portion 10, and the square lumber (91) and the first tubular portion 10 are inserted through the holes 11 by nails or screws. And are fixed. Further, a face material (94) is fixed to one side surface (front surface) of the first tubular portion 10 by a nail or a screw through a hole 12. The end of the first tubular portion 10 is closed by the second tubular portion 20.

Similarly, the second tubular portion 20 is a metal tubular member having an inner cross section of, for example, 30 mm × 40 mm. Then, on one side surface (front surface) of the second tubular portion 20, four holes 21, 21, 21, 21 for square timbers and holes 12 for three face timbers are provided at intervals in the length direction. , Are provided. For example, a square timber (92) having a cross section of 30 mm × 40 mm is inserted into the insertion portion 20a inside the second tubular portion 20, and the square timber 92 and the second tubular portion 20 are inserted through the hole 21 by a nail or a screw. And are fixed. Further, a face material (94) is fixed to one side surface (front surface) of the second tubular portion 20 by a nail or a screw through a hole 22.

In addition, the second tubular portion 20 is open without the end being blocked. That is, both ends of the insertion portion 20a inside the second tubular portion 20 are open. Therefore, as will be described later, the square timber (92) inserted into the second tubular portion 20 can penetrate the open end of the second tubular portion 20 and has an approximate length. You can use things.

The second tubular portion 20 is orthogonal to the first tubular portion 10 and is integrally formed so as to form a substantially L-shape on both sides. That is, the second tubular portion 20 is welded at an angle of 90 degrees so as to be orthogonal to the vicinity of the end of the first tubular portion 10.

Similarly, the third tubular portion 30 is a metal tubular member having an inner cross section of, for example, 30 mm × 40 mm. Two holes 31 and 31 for square timber are provided on one side surface of the third tubular portion 30. For example, a square lumber (93) having a cross section of 30 mm × 40 mm is inserted into the insertion portion 30a inside the third tubular portion 30, and the square lumber 93 and the third tubular portion 30 are inserted through the holes 31 by nails or screws. And are fixed. Further, a hole for a face material may be provided on one side surface (front surface) of the third tubular portion 30.

Further, the third tubular portion 30 is rotatably formed with respect to the first tubular portion 10 and the second tubular portion 20. Specifically, a bracket 41 is installed at a corner portion formed by the first tubular portion 10 and the second tubular portion 20, and a rotating shaft 42 is supported by the bracket 41. The third tubular portion 30 is rotatably supported by the rotating shaft 42 being inserted into the mounting hole 61 of the mounting portion 60 integrated with the third tubular portion 30. Since the rotating shaft 42 is installed in the direction perpendicular to the plane formed by the first cylinder portion 10 and the second cylinder portion 20, the third cylinder portion 30 is in the plane of the plane. It can be rotated with. The range of the rotation angle is preferably in the range of 70 degrees, for example, 10 degrees to 80 degrees.

Then, as shown in FIGS. 2 (a) and 2 (b), the jig M for the shutter of this embodiment is a telescopic mechanism that expands and contracts in the axial direction of the square lumber (93) inserted into the third tubular portion 30. It also has 50. The expansion / contraction mechanism 50 includes a right-hand screw (female screw) 51 screwed on the inner surface of the upper part of the third tubular portion 30, a screw member 52 having a male screw screwed around it, and an inner surface of the lower part of the mounting portion 60. It is composed of a left-handed screw (female screw) screwed into.

Further, as shown in FIG. 2A, the expansion / contraction mechanism 50 is configured to expand / contract by manually rotating the handle 54 in the forward / reverse direction. Specifically, a worm 55 is coaxially attached to the handle 54, and a worm gear 56 that meshes with the worm 55 is attached orthogonally to the handle 54. The worm gear 56 is attached coaxially with the screw member 52.

Then, by manually rotating the handle 54 in the forward direction / the reverse direction, the screw member 52 rotates in conjunction with the rotation. For example, by rotating the handle 54 in the forward direction, the screw member 52 also rotates in the forward direction, and the mounting portion 60 integrated with the right-hand screw 51 and the third tubular portion 30 integrated with the left-hand screw 53 are brought close to each other. That is, the expansion / contraction mechanism 50 contracts in the axial direction. On the contrary, by rotating the handle 54 in the opposite direction, the screw member 52 is also rotated in the opposite direction, and the mounting portion 60 integrated with the right-hand screw 51 and the third tubular portion 30 integrated with the left-hand screw 53 are separated from each other. That is, the expansion / contraction mechanism 50 extends in the axial direction.

Alternatively, as shown in FIG. 2B, the expansion / contraction mechanism 50 can be configured to expand / contract by rotating the nut portion 70 in the forward / reverse direction with a hand or a torque wrench (spanner). Specifically, the nut portion 70 is attached coaxially with the screw member 52.

Then, by rotating the nut portion 70 in the forward / reverse direction with a hand or a torque wrench (spanner) or the like, the coaxial screw member 52 rotates in conjunction with the rotation. For example, by rotating the nut portion 70 in the forward direction, the screw member 52 also rotates in the forward direction, and the mounting portion 60 integrated with the right-hand screw 51 and the third tubular portion 30 integrated with the left-hand screw 53 are brought close to each other. That is, the expansion / contraction mechanism 50 contracts in the axial direction. Conversely, by rotating the nut portion 70 in the opposite direction, the screw member 52 also rotates in the opposite direction, and the mounting portion 60 integrated with the right-hand screw 51 and the third tubular portion 30 integrated with the left-hand screw 53 are separated from each other. .. That is, the expansion / contraction mechanism 50 extends in the axial direction.

Then, using the jig M for the shutter of the embodiment, the shutter S as shown in FIGS. 3 to 5 can be constructed. The method of constructing the shutter will be described below.

(Construction method 1: When constructing a shutter on an existing window protruding from the outer wall surface)
Next, a method of constructing a shutter will be described. First, a case where the shutter is constructed on the existing window protruding from the outer wall surface by using the jig M for the shutter will be described. In this case, the following steps (1)-(6) are required as the steps.

(1) Process of arranging a pair of jigs M and M for shutters at diagonal positions of the existing window W In order to secure an adjustment allowance, it is preferable to extend the expansion / contraction mechanism 50 to the maximum in advance. This step (1) and the following steps (2) and (3) are carried out in parallel.

(2) A step of inserting and fixing one square timber 93 in common between a pair of jigs M for shutters M and the third tubular portions 30 and 30 of M. In a state where the square lumber 93 of the above is inserted into the third tubular portion 30 of the jigs M and M, the square lumber 93 is fixed through the hole 31 with a nail, a screw or the like.

(3) Step of hooking the hooking portions 13 and 23 on the outside of the frame of the existing window W In this step, the gaskets 14 and 24 attached inward to the hooking portions 13 and 23 are hooked on the outside of the existing window W. At this time, it is preferable to temporarily fasten using the expansion / contraction mechanism 50.

(4) A step of applying a tensile force in the axial direction of the square member 93 by contracting the expansion / contraction mechanism 50 In this step, the handle 54 of the expansion / contraction mechanism 50 is turned by hand, or the nut portion 70 is turned by hand or a spanner or the like. As a result, the expansion / contraction mechanism 50 is contracted to apply a tensile force. In order to tighten with a predetermined torque, it is preferable to control the torque with a torque wrench or the like. The step of applying the tensile force is preferably divided into a temporary fixing step before the next step (5) and a final tightening step after the next step (5).

(5) Step of inserting and fixing four square timbers 91, 91, 92, 92 into the first tubular portions 10, 10 and the second tubular portions 20, 20, respectively. Is inserted and fixed with a nail or a screw through the hole 31. Further, it is preferable that the square timbers 91 to 93 are screwed to each other.

(6) Step of fixing the face material 94 to the five square timbers 91 to 93 Finally, the face material 94 is attached to the five square timbers 91 to 93 and the jig M for the shutter with nails or screws through the holes 32. Fix it. Here, as the face material 94, a plywood, an acrylic plate, a polycarbonate plate, or the like can be used. For example, it is preferable to use a transparent acrylic plate or polycarbonate plate so that the interior can be seen from the outside even in a damaged house.

As described above, when the existing window W protrudes outside the outer wall surface, the shutter jigs M and M are hooked diagonally on the outside of the protruding portion, and then FIG. 5 (a) ), The square timbers 91 to 93 are fixed to the window W together with the jig M for the shutter by contracting the diagonal member and applying a tensile force. After that, the shutter S is completed by fixing the face member 94 to the fixed square timbers 91 to 93.

(Construction method 2: When constructing a shutter on an existing window that is pulled in (reserved) from the outer wall surface)
Next, a case where the shutter is constructed in the existing window drawn from the outer wall surface by using the jig M for the shutter will be described. In this case, the following steps (1)-(6) are required as the steps. The description of the same steps as the above-mentioned steps of the construction method 1 will be omitted.
(1) Process of arranging a pair of jigs M and M for shutters at diagonal positions of the existing window W In order to secure an adjustment allowance, it is preferable to shrink the expansion / contraction mechanism 50 to the maximum in advance.
(2) A process of inserting and fixing one square member 93 in common between a pair of jigs M for rain doors M and M's third tubular portions 30 and 30 (3) Jig M for rain doors, Step of placing M inside the frame of the existing window W (4) Step of applying a compressive force in the axial direction of the square member 93 by extending the telescopic mechanism 50 In this step, the handle 54 of the telescopic mechanism 50 is turned by hand. Alternatively, by turning the nut portion 70 with a hand, a spanner, or the like, the expansion / contraction mechanism 50 is extended and a compressive force is applied. In order to tighten with a predetermined torque, it is preferable to control the torque with a torque wrench or the like. The step of applying the compressive force is preferably divided into a temporary fixing step before the next step (5) and a final tightening step after the next step (5).
(5) Step of inserting and fixing four square timbers 91, 91, 92, 92 into the first tubular portions 10, 10 and the second tubular portions 20, 20 (6) Surfaces on the five square timbers 91 to 93 Step of fixing material 94

As described above, when the existing window W is pulled inward from the outer wall surface, the jigs M and M for the shutter are placed inside, and as shown in FIG. 5 (b). By extending the diagonal members diagonally and applying a compressive force, the square timbers 91 to 93 are fixed to the window W together with the jig M for the shutter. After that, the shutter S is completed by fixing the face member 94 to the fixed square timbers 91 to 93.

(effect)
Next, the effects of the jig M for the shutter of this embodiment will be listed and described.

(1) As described above, the jig M for the shutter of this embodiment includes a first tubular portion 10 into which the square member 91 is inserted and a second tubular portion 20 into which the square member 92 is inserted. A second tubular portion 20 and a third tubular portion 30 into which a 93-square member is inserted, which are integrally formed so as to form a substantially L-shape perpendicular to the first tubular portion 10. It includes a third tubular portion 30 that is rotatably formed with respect to the first tubular portion 10 and the second tubular portion 20. With such a configuration, by inserting the square timbers 91 to 93 into the jig M for the shutter and attaching the face member 94 to the square timbers 91 to 93, the strength is relatively high and it is easy without damaging the outer wall. A shutter S that can be attached to can be provided.

Therefore, the window W can be protected by installing the shutter S in advance against a relatively predictable disaster. It can also be used as a simple window for first aid after a disaster. Further, the window W can be firmly protected by using a high-strength member as the face material 94 installed on the front surface.

(2) Further, the square timber 93 inserted into the third tubular portion 30 expands and contracts in the axial direction, and a compressive force or a tensile force in the axial direction is applied to the square timber 93 inserted into the third tubular portion 30. It is preferable to further include the expansion / contraction mechanism 50. By providing the expansion / contraction mechanism 50 in this way, the shutter S can be more firmly fixed to the window W without damaging the window W or the outer wall.

(3) Further, a plurality of mounting holes for fixing the inserted square timbers 91 to 93 at desired positions in the first tubular portion 10, the second tubular portion 20, and the third tubular portion 30. Since 11, 21, 31, ... Are formed at intervals in the length direction, the square timbers 91 to 93 can be firmly fixed, and the square timbers 91 to 93 of arbitrary various lengths can be fixed. It will be easier.

(4) Further, at least one of the first tubular portion 10 and the second tubular portion 20 has an open end so that the inserted square timbers 91 and 92 can penetrate the square timber. Since the ends of 91 and 92 can be taken out from the tubular portions 10 and 20, the square timbers 91 and 92 can be easily and quickly inserted and fixed without accurately measuring the length of the square timbers 91 and 92.

(5) Further, the first tubular portion 10 and the second tubular portion 20 have hooking portions 13 and 23 projecting out of the plane formed by the first tubular portion 10 and the second tubular portion 20 that are orthogonal to each other. The existing windows W can be firmly held from the outside because the gaskets 14 and 24 are installed on the hooking portions 13 and 23.

(6) Then, the shutter S of the present embodiment is a pair of jigs M and M for shutters arranged diagonally in the existing window W, and is for any one pair of shutters described above. The jigs M and M, the square timbers 91 and 91 inserted and fixed in the first tubular portions 10 and 10, respectively, and the square timbers 92 and 92 inserted and fixed in the second tubular portions 20 and 20, respectively. A square member 93 that is commonly inserted and fixed between the third tubular portions 30 and 30 that face each other, and a face member 94 that is fixed to the square members 91 to 93 are provided. With such a configuration, the shutter S has relatively high strength and can be easily attached without damaging the outer wall.

(7) Then, the method of constructing the shutter of the present embodiment is a method of constructing the shutter S by constructing the shutter S on the existing window W protruding from the outer wall surface by using the jig M for the shutter of (5) described above. Is. The method of constructing the shutter is composed of the following steps. That is, the method of constructing the shutter includes the following six steps.
-A process of arranging a pair of jigs M and M for shutters at diagonal positions of the existing window W.
-A step of inserting and fixing a square timber 93 in common between a pair of jigs M for shutters and the third tubular portions 30 and 30 of M.
-A process of hooking the hooking portions 13 and 23 to the outside of the frame of the existing window W.
-A step of applying a tensile force in the axial direction of the square member 93 by contracting the expansion / contraction mechanism 50.
-A step of inserting and fixing the square timbers 91 and 92 into the first tubular portion 10 and the second tubular portion 20.
-A step of fixing the face member 94 to the square timbers 91 to 93.
According to such a construction method, it is possible to construct a shutter S which has relatively high strength and can be easily attached to the existing window W protruding from the outer wall surface without damaging the outer wall surface.

(8) Then, in the method of constructing the shutter of the present embodiment, the shutter S is constructed in the existing window W drawn in from the outer wall surface by using the jig M for the shutter of (2)-(5) described above. , How to build a shutter. The method of constructing the shutter is composed of the following steps. That is, the method of constructing the shutter includes the following six steps.
-A process of arranging a pair of jigs M and M for shutters at diagonal positions of the existing window W.
-A step of inserting and fixing a square timber 93 in common between a pair of jigs M for shutters and the third tubular portions 30 and 30 of M.
-A process of placing jigs M and M for shutters inside the frame of the existing window W.
-A step of applying a compressive force in the axial direction of the square timber 93 by stretching the expansion / contraction mechanism 50.
-A step of inserting and fixing the square timbers 91 and 92 into the first tubular portion 10 and the second tubular portion 20.
-A step of fixing the face member 94 to the square timbers 91 to 93.
According to such a construction method, it is possible to construct a shutter S which has relatively high strength and can be easily attached to the existing window W drawn (reserved) from the outer wall surface without damaging the outer wall surface.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent that the gist of the present invention is not deviated are described in the present invention. included.

For example, in the embodiment, the jig M for the shutter is described as being made of metal, but the jig M is not limited to metal, and may be made of, for example, ceramic or a high-strength synthetic resin. It may be.

Further, the actual arrangement of the jig M for the shutter is not limited to the arrangement described in the examples. Specifically, as shown in FIGS. 6 (a)-(c), various arrangements can be made. In particular, as shown in FIG. 6C, when the existing window W is large (large area), four jigs M for shutters can be used. In this case, for convenience of fixing the face member 94, the ends of the two diagonal square timbers 93, 93 are brought into contact with the remaining one diagonal square timber 93 so that the diagonal square timbers 93 do not intersect, and a screw or the like is used. It is preferable to fix by.

10: First tubular portion 10a: Insertion portion; 11: Hole; 12: Hole;
13: Hooking part; 14: Gasket 20: Second cylinder part 20a: Inserting part; 21: Hole; 22: Hole;
23: Hooking part; 24: Gasket 30: Third cylinder part 30a: Inserting part; 31: Hole; 32: Hole 41: Bracket; 42: Rotating shaft 50: Telescopic mechanism 51: Right-hand screw; 52: Screw member; 53: Left-hand screw 54: Handle; 55: Warm; 56: Worm gear 60: Mounting part; 61: Mounting hole 70: Nut part 91: Square timber; 92: Square timber; 93: Square timber; 94: Face material M: Jigger S : Ameto W: Existing window

Claims (8)

The first cylinder into which the square lumber is inserted and
A second tubular portion into which a square lumber is inserted, which is integrally formed so as to form a substantially L shape orthogonal to the first tubular portion.
A third tubular portion into which a square lumber is inserted, and a third tubular portion rotatably formed with respect to the first tubular portion and the second tubular portion.
Jig for shutters. A claim that further includes an expansion / contraction mechanism that expands / contracts in the axial direction of the square timber inserted into the third tubular portion and exerts a compressive force or a tensile force in the axial direction on the square timber inserted into the third tubular portion. The jig for a shutter according to item 1. A plurality of mounting holes for fixing the inserted square timber at a desired position are provided in the first tubular portion, the second tubular portion, and the third tubular portion at intervals in the length direction. The jig for a shutter according to claim 2, which is formed open. According to claim 2 or 3, at least one of the first tubular portion and the second tubular portion has an open end so that the inserted square timber can penetrate. Also, a jig for shutters. The first tubular portion and the second tubular portion further have a hooking portion that protrudes out of the plane formed by the first tubular portion and the second tubular portion that are orthogonal to each other, and the hooking portion is further provided. The jig for a shutter according to any one of claims 2 to 4, wherein a gasket is installed in the portion. A pair of jigs for shutters arranged diagonally in an existing window, and the pair of jigs for shutters according to any one of claims 1 to 5.
The square lumber inserted / fixed in each of the first tubular portions, the square lumber inserted / fixed in each of the second tubular portions, and the square lumber inserted / fixed in common between the opposing third tubular portions. With fixed square timber,
The face material fixed to the square timber and
A shutter with. A method for constructing a shutter, wherein the shutter is constructed on an existing window protruding from an outer wall surface by using the jig for the shutter according to claim 5.
The process of arranging a pair of jigs for shutters diagonally to the existing windows,
A process of inserting and fixing square timbers in common between the third cylinders of the pair of shutter jigs, and
The process of hooking the hooking portion to the outside of the frame of the existing window, and
A step of applying a tensile force in the axial direction of the square lumber by contracting the expansion / contraction mechanism, and
The step of inserting and fixing the square timber into the first tubular portion and the second tubular portion, and
The process of fixing the face material to the square timber and
How to build a shutter. A method for constructing a shutter, wherein the shutter is constructed in an existing window drawn from an outer wall surface by using the jig for the shutter according to any one of claims 2 to 5.
The process of arranging a pair of jigs for shutters diagonally to the existing windows,
A process of inserting and fixing square timbers in common between the third cylinders of the pair of shutter jigs, and
The process of placing the jig for the shutter inside the frame of the existing window, and
A step of applying a compressive force in the axial direction of the square lumber by extending the expansion / contraction mechanism, and
The step of inserting and fixing the square timber into the first tubular portion and the second tubular portion, and
The process of fixing the face material to the square timber and
How to build a shutter.

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