Air-tight structure

Abstract

To provide an air-tight structure capable of reliably filling gap between an insertion member having a plate portion with a connecting hole and a surface material.SOLUTION: An airtight member 4 includes: a surface material-adhering portion 4a that adheres to the entire periphery of an edge of a through hole 2a in a surface material 2; a member-adhering portion 4b that adheres to the entire periphery of the outer surface of an insert member 3 at the position on the back side of a plate portion 3a; and a connection portion 4c that connects the member-adhering portion 4b and the surface material-adhering portion 4a to surround the insert member 3 circumferentially between the member-adhering portion 4b and the surface material-adhering portion 4a.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an airtight structure having a surface member having a through-hole and an insertion member extending from the front side to the back side of the surface member through the through-hole, and configured to fill a gap between the surface member and the insertion member.

Background Art

[0002] Conventionally, as the airtight structure, for example, the airtight structure described in Patent Document 1 is known.

[0003] The airtight structure described in Patent Document 1 includes a floor surface (surface member) having a through-hole, a leg portion of a column (insertion member) extending from the front side to the back side of the floor surface through the through-hole, and an airtight cover for filling a gap between the floor surface and the leg portion.

[0004] The airtight cover has a first airtight cover attached to the leg portion from one side of the leg portion on the floor surface and a second airtight cover attached to the leg portion from the other side of the leg portion on the floor surface. Each of the first airtight cover and the second airtight cover has a column contact portion that contacts the outer peripheral surface of the leg portion and a floor contact surface that is integrally formed at the lower end of the column contact portion and contacts the floor surface (upper surface).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] By the way, as the insertion member, for example, there is also one as shown in FIG. 2. Specifically, the insertion member 3 shown in FIG. 2 has a plate portion 3a having a front surface and a back surface, a cylindrical portion 3b extending from the front surface of the plate portion 3a to the front side and having an internal space 3bs, and an extension portion 3c extending from the back surface of the plate portion 3a to the back side.

[0007] The plate portion 3a has a front-side opening 3a1 that opens to the front side toward the internal space 3bs and a back-side opening 3a2 that opens to the back side at a position deviated from the extending portion 3c, and a communication hole 3a3 extending from the front surface to the back surface is formed.

[0008] When the airtight cover described in Patent Document 1 is applied to the insertion member 3, the column contact portion is in close contact with the outer peripheral surface of the cylindrical portion 3b, and the floor contact surface is in close contact with the floor surface (upper surface). Thereby, the gap between the through-hole on the floor surface and the outer peripheral surface of the cylindrical portion 3b is blocked.

[0009] However, since the communication hole 3a3 is formed in the insertion member 3, there is a problem that the air flow between the space below the airtight cover and the internal space 3bs of the cylindrical portion 3b is allowed by the communication hole 3a3, and an airtight state cannot be formed.

[0010] An object of the present invention is to provide an airtight structure capable of reliably filling the gap between an insertion member having a plate portion in which a communication hole is formed and a facing material.

Means for Solving the Problems

[0011] In order to solve the above problems, a first invention is an airtight structure, comprising a face member having a through hole, an insertion member extending from the front side to the back side of the face member through the through hole, and an airtight member provided across the face member and the insertion member so as to fill a gap between the face member and the insertion member. The insertion member has a plate portion having a front surface and a back surface, a cylindrical portion extending from the front surface of the plate portion to the front side and having an internal space, and an extension portion extending from the back surface of the plate portion to the back side. The plate portion has a front side opening that opens to the front side toward the internal space and a back side opening that opens to the back side at a position deviated from the extension portion, and a communication hole extending from the front surface to the back surface is formed. The airtight member has a face member adhesion portion for closely adhering to the entire circumference of the edge portion of the through hole in the face member, a member adhesion portion for closely adhering to the entire circumference of the outer peripheral surface of the insertion member at a position on the back side of the plate portion, and a connection portion connecting the member adhesion portion and the face member adhesion portion so as to surround the insertion member over the entire circumference between the member adhesion portion and the face member adhesion portion. An airtight structure is provided.

[0012] According to the present invention, the face member adhesion portion closely adheres to the entire circumference of the edge portion of the through hole, and the member adhesion portion closely adheres to the entire circumference of the outer peripheral surface of the insertion member at a position on the back side of the plate portion. Therefore, the communication hole can be isolated from the space on the back side of the face member, that is, the space on the front side of the face member can be partitioned so as to include the communication hole.

[0013] Therefore, it is possible to regulate the flow of air from the space on the back side of the face member into the internal space of the cylindrical portion through the communication hole, and thereby reliably fill the gap between the insertion member and the face member.

[0014] A second invention is the first invention, wherein one of the first adhesion portions of the face member adhesion portion and the member adhesion portion extends from the connection portion in an outward direction away from the insertion member, and the connection portion preferably has an expansion portion that expands outward as it goes from the first adhesion portion to the other second adhesion portion of the face member adhesion portion and the member adhesion portion.

[0015] According to the second invention, when there is an obstacle near the first contact portion, or when the contact area of the second contact portion is wider than that of the first contact portion, etc., the first contact portion and the second contact portion can be efficiently connected by the extension portion.

[0016] According to the third invention, in the second invention, the first contact portion is the surface contact portion for contacting the surface of the facing material, the second contact portion is the member contact portion for contacting the outer peripheral surface of the large outer diameter portion of the insertion member provided at the back side position of the facing material and having an outer peripheral surface larger than the inner peripheral surface of the through hole in a plan view when looking from the front side to the back side, and it is preferable that the extension portion extends from the surface contact portion toward the back side of the facing material through the through hole.

[0017] According to the third invention, the large outer diameter portion of the insertion member having an outer peripheral surface larger than the inner peripheral surface of the through hole can be accommodated by utilizing the space at the back side of the facing material, and the surface contact portion and the member contact portion can be connected while avoiding interference with the facing material by utilizing the extension portion.

[0018] According to the fourth invention, in the second or third invention, the airtight member includes a first corresponding portion corresponding to at least a part of the first contact portion, a connection corresponding portion adjacent to the first corresponding portion in a longitudinal direction orthogonal to the lateral direction via a first horizontal line extending in the lateral direction and corresponding to at least a part of the connection portion, and a second corresponding portion adjacent to the connection corresponding portion in the longitudinal direction on the opposite side of the first corresponding portion via a second horizontal line extending in the lateral direction and corresponding to at least a part of the second contact portion, and includes a single sheet having a foldable property and airtightness. The connection corresponding portion has two covering portions arranged in the lateral direction for covering the insertion member from the outside, and an arrangement changing portion provided between the two covering portions, the outer diameter of the portion formed by the two covering portions increasing as going from the first corresponding portion toward the second corresponding portion, and being folded so as to change the relative orientation of the two covering portions.

[0019] According to the fourth invention, at least a part of the first adhering portion can be formed by folding a single sheet along the first horizontal line, and at least a part of the extension portion can be formed by folding the arrangement changing portion to change the relative arrangement of the two covering portions.

[0020] According to the fifth invention, in the fourth invention, the arrangement changing portion has a first vertical line and a second vertical line extending from a position spaced apart in the lateral direction at the first horizontal line toward the second corresponding portion, and an intermediate portion located between the first vertical line and the second vertical line, and it is preferable that the intermediate portion is located outside the two covering portions and has a property of being foldable so as to bring the first vertical line and the second vertical line together.

[0021] According to the fifth invention, for example, since the sheet 4A can be folded from the state shown in FIG. 3 to the state shown in FIG. 4, an excess portion (a portion near the reference numeral LL1a in FIG. 4) can be formed between a region adjacent to one covering portion in the first corresponding portion and a region adjacent to the other covering portion in the first corresponding portion. Therefore, when the sheet is folded so that the two covering portions face different directions in a state where the first corresponding portion extends outward with respect to the connection corresponding portion, for example, as shown in the shaded portion of FIG. 5, the excess portion can be developed so that a portion adjacent to one covering portion in the first corresponding portion and a portion adjacent to the other covering portion in the first corresponding portion are continuous.

[0022] According to the sixth invention, in the fifth invention, the first horizontal line has an intermediate first horizontal line portion located between the first vertical line and the second vertical line, one first horizontal line portion extending from the first vertical line in a direction away from the intermediate first horizontal line portion, and the other first horizontal line portion extending from the second vertical line in a direction away from the intermediate first horizontal line portion, and it is preferable that the one first horizontal line portion is arranged to form an obtuse angle with the first vertical line, and the other first horizontal line portion is arranged to form an obtuse angle with the second vertical line.

[0023] According to the sixth invention, since the angles between the first horizontal line portion on one side and the first vertical line, and between the first horizontal line portion on the other side and the second vertical line are set to obtuse angles, by folding the sheet so as to align the first vertical line and the second vertical line, the outer diameters of the portions (i.e., the expansion portions) formed by the covering portions can be arranged to increase as going from the first horizontal line to the second horizontal line.

[0024] According to the seventh invention, in the sixth invention, it is preferable that the first horizontal line portion on one side and the first horizontal line portion on the other side are arranged on the same straight line in the state before the sheet is folded back.

[0025] According to the seventh invention, since the first horizontal line portion on one side and the first horizontal line portion on the other side are arranged linearly, a horizontally long sheet can be used to form an airtight member, and the sheet can be efficiently manufactured from the sheet material.

[0026] Here, when the first horizontal line portion on one side and the first horizontal line portion on the other side are arranged linearly as in the seventh invention, there are the following problems. Hereinafter, with reference to FIGS. 3 to 5, the problems will be described.

[0027] As shown in FIG. 3, when one first horizontal line portion LL1b and the other first horizontal line portion LL1c are arranged in a straight line, the first vertical line VL1 and the second vertical line VL2 approach each other as they extend toward the second horizontal line LL2. In this case, the rotation center RC1 for rotating the two covering portions 4A2a and 4A2b so as to align the first vertical line VL1 and the second vertical line VL2 is arranged at a position on the side of the second corresponding portion 4A3 with reference to the intermediate first horizontal line portion LL1a. The two distances R1 from the rotation center RC1 to one first horizontal line portion LL1b and the other first horizontal line portion LL1c are longer than the distance R2 from the rotation center RC1 to the intermediate first horizontal line portion LL1a. Therefore, as shown in FIG. 4, when the sheet 4A is folded back so that the covering portions 4A2a and 4A2b are rotated about the rotation center RC1 to align the first vertical line VL1 and the second vertical line VL2, the intermediate first horizontal line portion LL1a is arranged closer to the second corresponding portion 4A3 than one first horizontal line portion LL1b and the other first horizontal line portion LL1c. As a result, it is difficult to sufficiently secure the area of the region connecting the region adjacent to one covering portion 4A2a and the region adjacent to the other covering portion 4A2b in the first corresponding portion 4A1 (the area of the shaded region in FIG. 5).

[0028] In order to solve the above problems, in the eighth invention, in the sixth invention, it is preferable that the first vertical line and the second vertical line extend parallel from the first horizontal line toward the second horizontal line or extend away from each other as they extend toward the second horizontal line in the state before the sheet is folded back.

[0029] When the first vertical line and the second vertical line extend parallel from the first horizontal line toward the second horizontal line as described in the eighth invention, the following effects are achieved. Hereinafter, the effects will be described by taking FIGS. 8 to 10 as examples.

[0030] In the sheet 4C where the first vertical line VL5 and the second vertical line VL6 extend parallel from the first horizontal line LL1 to the second horizontal line LL2, instead of rotating the covering portion about the rotation center as described above, the first vertical line VL5 and the second vertical line VL6 can be aligned so that the covering portions 4A2a and 4A2b are translated along the intermediate first horizontal line portion LL1d. Therefore, in the folded state shown in FIG. 9, the intermediate first horizontal line portion LL1d can be arranged at a position farther from the second corresponding portion 4A3 as compared with the case of rotating the covering portion as described above. Therefore, in the state shown in FIG. 10 where the sheet 4C is folded so that the first corresponding portion 4A1 extends outward, the area of the region connecting the region adjacent to one covering portion 4A2a in the first corresponding portion 4A1 and the region adjacent to the other covering portion 4A2b (the area of the shaded region in FIG. 10) can be sufficiently ensured.

[0031] Further, when the first vertical line and the second vertical line extend away from each other as they approach the second horizontal line as described in the eighth invention, the following effect is obtained. Hereinafter, this effect will be described by taking FIGS. 11 and 12 as examples.

[0032] The first vertical line VL8 and the second vertical line VL9 extend away from each other as they approach the second horizontal line LL2 in the state before the sheet 4D is folded back. Therefore, the rotation center RC2 for rotating the two covering portions 4A2a and 4A2b so as to align the first vertical line VL8 and the second vertical line VL9 is arranged at a position on the side opposite to the second corresponding portion 4A3 with respect to the intermediate first horizontal line portion LL1g. The two distances R3 from the rotation center RC2 to one first horizontal line portion LL1h and the other first horizontal line portion LL1i are longer than the distance R4 from the rotation center RC2 to the intermediate first horizontal line portion LL1g. Therefore, as shown in FIG. 12, when the sheet 4D is folded back so that the covering portions 4A2a and 4A2b are rotated about the rotation center RC2 to align the first vertical line VL8 and the second vertical line VL9, the intermediate first horizontal line portion LL1g is arranged at a position farther from the second corresponding portion 4A3 than one first horizontal line portion LL1h and the other first horizontal line portion LL1i. As a result, it is possible to sufficiently secure the area of the region connecting the region adjacent to one covering portion 4A2a and the region adjacent to the other covering portion 4A2b in the first corresponding portion 4A1.

Advantages of the Invention

[0033] According to the present invention, the gap between the insertion member having the plate portion formed with the communication holes and the facing material can be reliably filled.

Brief Description of the Drawings

[0034]

Figure 1

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Figure 19

Embodiments for Carrying Out the Invention

[0035] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiments are examples that embody the present invention and do not have the character of limiting the technical scope of the present invention.

[0036] FIG. 1 is a side cross-sectional view showing an airtight structure according to an embodiment of the present invention. FIG. 2 is a perspective view showing a state in which a part of the airtight member and the facing material is omitted in the airtight structure of FIG. 1.

[0037] Referring to FIGS. 1 and 2, the airtight structure 1 includes a facing material 2 having a through-hole 2a, an insertion member 3 extending from the front side (the upper side in FIG. 1) to the back side of the facing material 2 through the through-hole 2a, and an airtight member 4 provided across the facing material 2 and the insertion member 3 so as to fill the gap between the facing material 2 and the insertion member 3.

[0038] The facing material 2 is for forming, for example, the floor of a building and is supported on the ground by a bundle (not shown). The through-hole 2a of the facing material 2 has a planar shape adapted to the cross-sectional shape of the insertion member 3 described later. Specifically, the through-hole 2a in the present embodiment has a substantially square planar shape. Note that the facing material 2 is not limited to that for forming a floor. For example, a facing material 2 for forming a wall can also be applied.

[0039] The insertion member 3 has a plate portion 3a having a front surface (the upper surface in FIG. 1) and a back surface, a cylindrical portion 3b extending from the front surface of the plate portion 3a to the front side and having an internal space 3bs, and an extension portion 3c extending from the back surface of the plate portion 3a to the back side.

[0040] The plate portion 3a has a front-side opening 3a1 that opens to the front side toward the inside of the internal space 3bs and a back-side opening 3a2 that opens to the back side at a position deviated from the extension portion 3c, and four communication holes 3a3 extending from the front surface to the back surface are formed. The four communication holes 3a3 are provided at positions that fit within the internal space 3bs of the cylindrical portion 3b in a plan view looking from the front side to the back side.

[0041] The cylindrical portion 3b has an outer diameter that can be inserted into the through-hole 2a. Specifically, the cylindrical portion 3b is a cylindrical member having a square planar shape smaller than the planar shape of the through-hole 2a. The internal space 3bs extends from the plate portion 3a to the front side and communicates with the space on the facing material 2 through a path outside the drawing. An airtight member described later connects the facing material 2 and the insertion member 3 so that the internal space 3bs and the communication hole 3a3 are included in the space on the facing material 2.

[0042] The extending portion 3c has an extending body 3c1 extending from the back surface of the plate portion 3a, and a fixed portion (large outer diameter portion) 3c2 provided at the tip of the extending body 3c1 and fixed on the foundation B. The extending body 3c1 has a shape such that a space communicating with the space on the back side of the facing material 2 is formed at a position overlapping the four communication holes 3a3 in a plan view. Specifically, the extending body 3c1 has a cross-shaped cross-sectional shape. Therefore, the space on the back side of the plate portion 3a and the internal space 3bs of the cylindrical portion 3b communicate with each other through the communication hole 3a3. The fixed portion 3c2 has an outer peripheral surface larger than the inner peripheral surface of the through-hole 2a in a plan view. Specifically, the fixed portion 3c2 is a square plate material. The member adhesion portion 4b of the airtight member 4 described later adheres to the outer peripheral surface of the fixed portion 3c2.

[0043] In the present embodiment, as shown in FIG. 1, the insertion member 3 is arranged such that the plate portion 3a is accommodated within the thickness region of the facing material 2. However, the positional relationship between the facing material 2 and the insertion member 3 is not limited to the positional relationship shown in FIG. 1. For example, the plate portion 3a may be provided at a position on the front side of the facing material 2 or at a position on the back side of the facing material 2.

[0044] The airtight member 4 has a facing material adhesion portion 4a for adhering to the entire circumference of the edge portion of the through-hole 2a in the facing material 2, a member adhesion portion 4b for adhering to the entire circumference of the outer peripheral surface of the insertion member 3 at a position on the back side of the plate portion 3a, and a connection portion 4c connecting the facing material adhesion portion 4a and the member adhesion portion 4b.

[0045] The surface material contact portion 4a extends from the connecting portion 4c in an outward direction away from the insertion member 3. That is, in the first embodiment, the surface material contact portion 4a corresponds to the first contact portion. Further, the surface material contact portion 4a is in close contact with the entire circumference of the through-hole 2a with respect to the surface of the surface material 2 constituting the edge portion of the through-hole 2a. As a method of closely adhering the surface material contact portion 4a to the surface material 2, a method of providing an adhesive layer between the two or a method of attaching a tape across the surface material contact portion 4a and the surface material 2 can be applied.

[0046] The member contact portion 4b is in close contact with the entire circumference of the insertion member 3 with respect to the outer peripheral surface of the fixed portion 3c2 of the insertion member 3. As a method of closely adhering the member contact portion 4b to the insertion member 3, a method of providing an adhesive layer between the two or a method of attaching a tape across the member contact portion 4b and the insertion member 3 or the base B can be adopted. In the first embodiment, the member contact portion 4b corresponds to the second contact portion.

[0047] The connecting portion 4c connects the surface material contact portion 4a and the member contact portion 4b so as to surround the insertion member 3 over the entire circumference between the surface material contact portion 4a and the member contact portion 4b. Further, the connecting portion 4c has a shape that expands outward as it goes from the surface material contact portion 4a toward the member contact portion 4b. In the first embodiment, the connecting portion 4c has a shape that expands outward over the entire length from the surface material contact portion 4a to the member contact portion 4b. That is, the entire connecting portion 4c in the first embodiment corresponds to the expansion portion. Further, the connecting portion 4c extends from the surface material contact portion 4a toward the back side of the surface material 2 through the through-hole 2a.

[0048] FIG. 3 is a plan view showing a sheet 4A for constituting the airtight member 4 shown in FIG. 1.

[0049] Referring to FIG. 3, the airtight member 4 is configured by folding back a single sheet 4A so as to surround the periphery of the insertion member 3 and bringing it into close contact with the surface material 2 and the insertion member 3, and maintaining the form of the sheet 4A with a tape or the like.

[0050] Sheet 4A is a sheet having foldable characteristics and airtightness. For example, as the material of sheet 4A, polyethylene, polypropylene, aluminum (including multi-layer products with other materials) can be applied. Further, sheet 4A has a first corresponding part 4A1 corresponding to the surface material adhesion part 4a, a connection corresponding part 4A2 corresponding to the connection part 4c, and a second corresponding part 4A3 corresponding to the member adhesion part 4b. The connection corresponding part 4A2 is adjacent to the first corresponding part 4A1 in the vertical direction (the up-down direction in FIG. 3) perpendicular to the horizontal direction (the left-right direction in FIG. 3) via a first horizontal line LL1 extending in the horizontal direction. The second corresponding part 4A3 is vertically adjacent to the connection corresponding part 4A2 on the opposite side of the first corresponding part 4A1 via a second horizontal line LL2 extending in the horizontal direction. It is preferable that folding lines are formed in advance along the first horizontal line LL1 and the second horizontal line LL2 on the sheet 4A to facilitate folding of the sheet 4A, but the folding lines can also be omitted.

[0051] The connection corresponding part 4A2 has five covering parts 4A2a, 4A2b, 4A2c, 4A2d, 4A2e (hereinafter collectively referred to as 4A2a to 4A2e) arranged in the horizontal direction to cover the insertion member 3 from the outside, and four arrangement changing parts 4A2f, 4A2g, 4A2h, 4A2i (hereinafter collectively referred to as 4A2f to 4A2i) provided between the adjacent covering parts 4A2a to 4A2e.

[0052] The covering parts 4A2a to 4A2e are the hatched areas in FIG. 3 and are areas for forming the connection part 4c having a tapered outer peripheral surface from the first corresponding part 4A1 toward the second corresponding part 4A3. Specifically, the covering parts 4A2a to 4A2d each have an isosceles trapezoidal planar shape, and the covering part 4A2e has a planar shape obtained by cutting the other covering parts 4A2a to 4A2d in half along the midline in the horizontal direction. The covering part 4A2e is an area for being superposed on the covering part 4A2a.

[0053] The arrangement change portions 4A2f to 4A2i are regions where the outer diameter of the connection portion 4c formed by the covering portions 4A2a to 4A2e increases as it goes from the first corresponding portion 4A1 to the second corresponding portion 4A3, and where the relative orientations of the covering portions 4A2a to 4A2e are changed by being folded back. In the present embodiment, by the arrangement change portions 4A2f to 4A2i, those of the covering portions 4A2a to 4A2e that are adjacent to each other are arranged in directions that are 90 degrees different (see FIG. 5).

[0054] Specifically, the arrangement change portions 4A2f to 4A2i have a first vertical line VL1 and a second vertical line VL2 that extend from positions spaced apart in the horizontal direction on the first horizontal line LL1 toward the second corresponding portion 4A3, and an intermediate portion IP1 located between the first vertical line VL1 and the second vertical line VL2. Further, the first horizontal line LL1 has an intermediate first horizontal line portion LL1a located between the first vertical line VL1 and the second vertical line VL2, a first horizontal line portion LL1b that extends from the first vertical line VL1 in a direction away from the intermediate first horizontal line portion LL1a, and a first horizontal line portion LL1c that extends from the second vertical line VL2 in a direction away from the intermediate first horizontal line portion LL1a. Note that, depending on the reference arrangement change portion among the arrangement change portions 4A2f to 4A2i, since the horizontal line portion defined by the first horizontal line portion LL1b and the horizontal line portion defined by the first horizontal line portion LL1c are different, the reference numerals LL1a to LL1c are attached only to the arrangement change portion 4A2f. The first horizontal line portion LL1b is arranged so as to form an obtuse angle with the first vertical line VL1. The first horizontal line portion LL1c is arranged so as to form an obtuse angle with the second vertical line VL2. In each of the covering portions 4A2a to 4A2e, the angle between the first vertical line VL1 and the first horizontal line portion LL1b, and the angle between the second vertical line VL2 and the first horizontal line portion LL1c are set to the same angle. And the intermediate first horizontal line portion LL1a, the first horizontal line portion LL1b, and the first horizontal line portion LL1c are arranged on the same straight line (on the straight line extending in the left - right direction in FIG. 3) in the state before the sheet 4A is folded back. Furthermore, the second horizontal line LL2 extends parallel to the first horizontal line LL1.

[0055] The first vertical line VL1 and the second vertical line VL2 are connected to each other at a point (rotation center RC1, to be described later) on the second horizontal line LL2. Also, the first vertical line VL1 and the second vertical line VL2 are arranged symmetrically in the horizontal direction with respect to the third vertical line VL3 that passes through the rotation center RC1 and is orthogonal to the first horizontal line LL1 (intermediate first horizontal line portion LL1a).

[0056] Hereinafter, with reference to FIGS. 3 to 5, the folding procedure of the sheet 4A for constituting the airtight member 4 will be described. In particular, the folding method of the portion including the covering portions 4A2a, 4A2b and the arrangement change portion 4A2f will be mainly described.

[0057] First, the intermediate portion IP1 in the arrangement change portion 4A2f is positioned outside the two covering portions 4A2a, 4A2b, and the sheet 4A is folded so that the first vertical line VL1 and the second vertical line VL2 are aligned with each other. Specifically, the circular marks (the first vertical line VL1 and the second vertical line VL2) in FIG. 3 are aligned on the back side of the triangular mark (the third vertical line VL3), the circular marks on the sheet 4A are valley-folded, and the triangular marks on the sheet 4A are mountain-folded.

[0058] Next, the intermediate portion IP1 is folded so that the intermediate portion IP1 overlaps the covering portions 4A2a, 4A2b. Specifically, the intermediate portion IP1 is folded by mountain-folding the sheet 4A along the angle bisector DL1 of the angle formed by the first vertical line VL1 and the third vertical line VL3 and the angle bisector DL2 of the angle formed by the second vertical line VL2 and the third vertical line VL3. Although the folding method of the intermediate portion IP1 using the angle bisectors DL1, DL2 has been described, the folding method of the intermediate portion IP1 is not limited thereto. For example, the intermediate portion IP1 can also be folded by alternately folding the sheet 4A in a valley and mountain pattern along a plurality of auxiliary vertical lines VL4 (four are shown in FIG. 3) that are provided between the first vertical line VL1 and the second vertical line VL2 and the third vertical line VL3 and extend parallel to the third vertical line VL3.

[0059] When the intermediate portion IP is folded along the bisectors DL1 and DL2 as described above, the sheet 4A assumes the shape shown in FIG. 4. In this state, the sheet 4A is folded back along the third vertical line VL3 so that the covering portions 4A2a and 4A2b face in directions that are 90° different from each other.

[0060] Furthermore, as shown in FIG. 5, the sheet 4A is folded back so that the first corresponding portion 4A1 extends outward from the covering portions 4A2a and 4A2b (in a direction away from the insertion member 3), and the folded portion in the first corresponding portion 4A1 is unfolded. Specifically, the folded portion in the first corresponding portion 4A1 is first opened, and then a new folded portion is formed in the first corresponding portion 4A1 with the covering portions 4A2a and 4A2b arranged in directions that are 90° different from each other. As a result, as shown in FIG. 5, the shape of the sheet 4A is maintained with the covering portions 4A2a and 4A2b arranged in different directions.

[0061] By sequentially performing the above procedure for the arrangement changing portions 4A2g to 4A2i, the covering portions 4A2a to 4A2e can be arranged in a cylindrical shape. Then, by fixing the mutually overlapping covering portions 4A2a and 4A2e with a tape or the like, the airtight member 4 can be formed.

[0062] As described above, according to the first embodiment, since the face material adhesion portion 4a adheres to the entire circumference of the edge of the through hole 2a, and the member adhesion portion 4b adheres to the entire circumference of the outer peripheral surface of the insertion member 3 at a position on the back side of the plate portion 3a, the communication hole 3a3 can be isolated from the space on the back side of the face material 2, that is, the space on the front side of the face material 2 containing the communication hole 3a3 can be partitioned.

[0063] Therefore, it is possible to regulate the flow of air from the space on the back side of the face material 2 through the communication hole 3a3 into the internal space 3bs of the cylindrical portion 3b, and thereby reliably fill the gap between the insertion member 3 and the face material 2.

[0064] Further, the connecting portion 4c has an expanding portion (connecting portion 4c) that expands outward as it goes from the surface material adhering portion 4a to the member adhering portion 4b. Therefore, in a case where the adhering region of the member adhering portion 4b (the outer peripheral surface of the fixed portion 3c2) is wider than the surface material adhering portion 4a as in the first embodiment, the surface material adhering portion 4a and the member adhering portion 4b can be efficiently connected by the expanding portion (connecting portion 4c).

[0065] Furthermore, the fixed portion 3c2 of the insertion member 3 having an outer peripheral surface larger than the inner peripheral surface of the through hole 2a can be accommodated using the space on the back side of the surface material 2, and the surface material adhering portion 4a and the member adhering portion 4b can be connected while avoiding interference with the surface material 2 by using the expanding portion (connecting portion 4c).

[0066] Also, the sheet 4A has covering portions 4A2a to 4A2e and arrangement changing portions 4A2f to 4A2i. Therefore, the surface material adhering portion 4a can be formed by folding the single sheet 4A along the first horizontal line LL1, and the expanding portion (connecting portion 4c) can be formed by folding the arrangement changing portions 4A2f to 4A2i to change the relative arrangement of the covering portions 4A2a to 4A2e.

[0067] Furthermore, the arrangement changing portions 4A2f to 4A2i have a first vertical line VL1, a second vertical line VL2, and an intermediate portion IP1. Thereby, since the sheet 4A can be folded from the state shown in FIG. 3 to the state shown in FIG. 4, an excess portion (a portion near the reference sign LL1a in FIG. 4) can be formed between a region adjacent to one covering portion 4A2a in the first corresponding portion 4A1 and a region adjacent to the other covering portion 4A2b in the first corresponding portion 4A1. Therefore, when folding the sheet so that the two covering portions 4A2a and 4A2b face different directions in a state where the first corresponding portion 4A1 extends outward with respect to the connection corresponding portion 4A2, for example, as shown in the shaded portion of FIG. 5, the excess portion can be developed so that a portion adjacent to one covering portion 4A2a in the first corresponding portion 4A1 and a portion adjacent to the other covering portion 4A2b in the first corresponding portion 4A1 are continuous.

[0068] Also, since the angles between the first horizontal line portion LL1b and the first vertical line VL1 on one side, and between the first horizontal line portion LL1c and the second vertical line VL2 on the other side are set to obtuse angles, by folding the sheet so as to bring the first vertical line VL1 and the second vertical line VL2 together, the outer diameters of the portions (i.e., the expansion portions) formed by the covering portions 4A2a and 4A2b can be arranged to increase as going from the first horizontal line LL1 toward the second horizontal line LL2.

[0069] Furthermore, since the first horizontal line portion LL1b on one side and the first horizontal line portion LL1c on the other side are arranged in a straight line, the horizontally long sheet 4A can be used to form the airtight member 4, and the sheet 4A can be efficiently manufactured from the sheet material.

[0070] Hereinafter, with reference to FIGS. 6 and 7, the sheet 4B according to the second embodiment of the present invention will be described. FIG. 6 is a plan view showing the sheet 4B according to the second embodiment of the present invention. FIG. 7 is a view corresponding to FIG. 4 of the sheet shown in FIG. 6. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0071] In the sheet 4A of the first embodiment, the first vertical line VL1 and the second vertical line VL2 are connected at the rotation center RC1 on the second horizontal line LL2, but the first vertical line VL1 and the second vertical line VL2 do not necessarily need to be connected to each other. In the sheet 4B of the second embodiment, the first vertical line VL1 and the second vertical line VL2 terminate at different positions P1 and P2 in the horizontal direction on the second horizontal line LL2.

[0072] Hereinafter, the folding procedure of the sheet 4B for forming the airtight member 4 will be described.

[0073] First, the intermediate part IP1 in the arrangement change part 4A2f is located outside the two covering parts 4A2a and 4A2b, and the sheet 4B is folded so that the first vertical line VL1 and the second vertical line VL2 are aligned with each other. Specifically, as shown by the circles in FIG. 6 being aligned behind the triangles, the circles on the sheet 4B are valley-folded, and the triangles on the sheet 4B are mountain-folded.

[0074] Next, the intermediate part IP1 is folded so that the intermediate part IP1 overlaps the covering parts 4A2a and 4A2b. Specifically, the sheet 4B is mountain-folded along the angle bisector DL1 formed by the first vertical line VL1 and the third vertical line VL3, and the angle bisector DL2 formed by the second vertical line VL2 and the third vertical line VL3, so that the intermediate part IP1 is folded as shown in FIG. 7.

[0075] From the state shown in FIG. 7, in the same manner as in the first embodiment, the sheet 4B is folded back along the third vertical line VL3 so that the covering part 4A2a and the covering part 4A2b face in directions that are 90° different from each other. Further, the sheet 4B is folded back so that the first corresponding part 4A1 extends outward, and the folded part in the first corresponding part 4A1 is unfolded. Thereafter, by following the same procedure as in the first embodiment, the airtight member 4 can be formed.

[0076] In addition, in the second embodiment described above, it is preferable to make a cut in the region of the second corresponding part 4A3 sandwiched between the extension lines of the first vertical line VL1 and the second vertical line VL2. This makes it easier for the second corresponding part 4A3 to be in close contact with the periphery of the fixed part 3c2. Further, by providing a notch CP1 as shown in FIGS. 17 and 18 described later in the region, it becomes easier for the second corresponding part 4A3 to be in close contact with the periphery of the fixed part 3c2.

[0077] Also, in the first and second embodiments, one first horizontal line portion LL1b and the other first horizontal line portion LL1c are arranged on the same straight line in the state before the sheets 4A and 4B are folded back. Therefore, the first vertical line VL1 and the second vertical line L2 approach each other as they go toward the second horizontal line LL2. In this case, the rotation center RC1 (FIGS. 3 and 6) for rotating the two covering portions 4A2a and 4A2b so as to align the first vertical line VL1 and the second vertical line VL2 is arranged at a position on the side of the second equivalent portion 4A3 with reference to the intermediate first horizontal line portion LL1a. The rotation center RC1 in the first embodiment coincides with the intersection of the first vertical line VL1 and the second vertical line VL2. The rotation center RC1 in the second embodiment is a point where the distances from the closer ends of the first vertical line VL1 and the second vertical line VL2 to the second equivalent portion 4A3 are equal. In the illustrated example, it coincides with the intersection of the extension lines of the first vertical line VL1 and the second vertical line VL2. In the first and second embodiments, the two distances R1 (see FIGS. 3 and 6) from the rotation center RC1 to one first horizontal line portion LL1b and the other first horizontal line portion LL1c are longer than the distance R2 (see FIGS. 3 and 6) from the rotation center RC1 to the intermediate first horizontal line portion LL1a. Therefore, as shown in FIGS. 4 and 7, when the sheets 4A and 4B are folded back so that the covering portions 4A2a and 4A2b are rotated about the rotation center RC1 to align the first vertical line VL1 and the second vertical line VL2, the intermediate first horizontal line portion LL1a is arranged closer to the second equivalent portion 4A3 than one first horizontal line portion LL1b and the other first horizontal line portion LL1c. As a result, it is difficult to sufficiently secure the area of the region (the area of the shaded region in FIG. 5) that connects the region adjacent to one covering portion 4A2a and the region adjacent to the other covering portion 4A2b in the first equivalent portion 4A1.

[0078] In order to solve such problems, the sheets 4C and 4D of the third and fourth embodiments described below can be applied.

[0079] FIG. 8 is a plan view showing a sheet 4C according to the third embodiment of the present invention. Hereinafter, with reference to FIGS. 8 to 10, the configuration of the sheet 4C according to the third embodiment will be described. In the sheet 4C, the same components as those of the sheets 4A and 4B according to the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0080] The first horizontal line LL1 and the second horizontal line LL2 in the sheet 4C are not straight lines like the first horizontal line LL1 and the second horizontal line LL2 in the sheets 4A and 4B according to the first and second embodiments, but are set as bent lines.

[0081] Specifically, the arrangement change portions 4A2f to 4A2i in the sheet 4C include a first vertical line VL5 and a second vertical line VL6 that extend from positions spaced apart in the horizontal direction on the first horizontal line LL1 toward the second corresponding portion 4A3, and an intermediate portion IP2 located between the first vertical line VL5 and the second vertical line VL6. Further, the first horizontal line LL1 includes an intermediate first horizontal line portion LL1d located between the first vertical line VL5 and the second vertical line VL6, a first horizontal line portion LL1e extending from the first vertical line VL5 in a direction away from the intermediate first horizontal line portion LL1d, and a second first horizontal line portion LL1f extending from the second vertical line VL6 in a direction away from the intermediate first horizontal line portion LL1d.

[0082] The first vertical line VL5 and the second vertical line VL6 extend parallel to each other from the first horizontal line LL1 toward the second horizontal line LL2 in the state before the sheet 4C is folded. Therefore, by folding the sheet 4C so as to translate both covering portions 4A2a and 4A2b along the intermediate first horizontal line portion LL1d, the intermediate portion IP2 is located outside the covering portions 4A2a and 4A2b, and the sheet 4C can be folded so that the first vertical line VL5 and the second vertical line VL6 are aligned with each other. Specifically, the circle marks (the first vertical line VL5 and the second vertical line VL6) in FIG. 8 are valley-folded in the sheet 4C, and the triangle marks (the third vertical line VL7) in the sheet 4C are mountain-folded so that the circle marks are aligned with the back side of the triangle marks. Note that the third vertical line VL7 is a straight line that is parallel to the first vertical line VL5, orthogonal to the intermediate first horizontal line portion LL1d, and bisects the width dimension between the first vertical line VL5 and the second vertical line VL6.

[0083] Next, fold the intermediate portion IP2 so that the intermediate portion IP2 overlaps the covering portions 4A2a and 4A2b. Specifically, fold the sheet 4C in a valley fold along the bisecting line DL3 that bisects the width dimension between the first vertical line VL5 and the third vertical line VL7, and the bisecting line DL4 that bisects the width dimension between the second vertical line VL6 and the third vertical line VL7, thereby folding the intermediate portion IP2. Note that, similar to the above embodiment, the method of folding the intermediate portion IP2 is not limited to the method of folding along the bisecting lines DL3 and DL4.

[0084] By folding the intermediate portion IP2, the sheet 4C takes the form shown in FIG. 9. In this state, fold back the sheet 4C along the third vertical line VL7 so that the covering portion 4A2a and the covering portion 4A2b face in directions that are 90° different from each other.

[0085] Here, in the third embodiment, instead of aligning the first vertical line VL1 and the second vertical line VL2 so as to rotate the covering portions 4A2a and 4A2b about the rotation center RC1 (see FIGS. 3 and 6) as in the first and second embodiments, the first vertical line VL5 and the second vertical line VL6 can be aligned so as to translate the covering portions 4A2a and 4A2b along the intermediate first horizontal line portion LL1d. Therefore, in the folded state shown in FIG. 9, the intermediate first horizontal line portion LL1d can be arranged at a position farther from the second equivalent portion 4A3 than the intermediate first horizontal line portion LL1d of the first and second embodiments. Therefore, in the state shown in FIG. 10 where the sheet 4C is folded back so that the first equivalent portion 4A1 extends outward, the area of the region connecting the region adjacent to one covering portion 4A2a and the region adjacent to the other covering portion 4A2b in the first equivalent portion 4A1 (the area of the shaded region in FIG. 10) can be sufficiently ensured.

[0086] In addition, in the above-described third embodiment, it is preferable to make a cut in the region sandwiched between the extension lines of the first vertical line VL5 and the second vertical line VL6 in the second corresponding portion 4A3. This makes it easier to closely attach the second corresponding portion 4A3 around the fixed portion 3c2. Further, by providing a notch CP1 as shown in FIGS. 17 and 18 described later in the above region, it becomes easier to closely attach the second corresponding portion 4A3 around the fixed portion 3c2. Furthermore, when the sheet 4D according to the fourth embodiment shown in FIGS. 11 and 12 is used, it becomes possible to secure a larger area of the above region.

[0087] FIG. 11 is a plan view showing a sheet according to the fourth embodiment of the present invention. Hereinafter, with reference to FIGS. 11 and 12, the configuration of the sheet 4D according to the fourth embodiment will be described. In the sheet 4D, the same components as those of the sheets 4A to 4C according to the first to third embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0088] The first horizontal line LL1 and the second horizontal line LL2 in the sheet 4D are set as lines bent at a larger angle as compared with the sheet 4C according to the third embodiment.

[0089] Specifically, the arrangement change portions 4A2f to 4A2i in the sheet 4D include a first vertical line VL8 and a second vertical line VL9 extending from positions spaced laterally on the first horizontal line LL1 toward the second corresponding portion 4A3, and an intermediate portion IP3 positioned between the first vertical line VL8 and the second vertical line VL9. The first horizontal line LL1 includes an intermediate first horizontal line portion LL1g positioned between the first vertical line VL8 and the second vertical line VL9, a first horizontal line portion LL1h extending from the first vertical line VL8 in a direction away from the intermediate first horizontal line portion LL1g, and another first horizontal line portion 11i extending from the second vertical line VL9 in a direction away from the intermediate first horizontal line portion LL1g.

[0090] The first vertical line VL8 and the second vertical line VL9 extend away from each other as they approach the second horizontal line LL2 in the state before the folding of the sheet 4D. Therefore, the rotation center RC2 (in the illustrated example, the virtual intersection of the extension lines of both vertical lines VL8 and VL9) for rotating the two covering portions 4A2a and 4A2b so as to align the first vertical line VL8 and the second vertical line VL9 is arranged at a position on the side opposite to the second corresponding portion 4A3 with respect to the intermediate first horizontal line portion LL1g. By rotating the covering portions 4A2a and 4A2b about the rotation center RC2, the intermediate portion IP3 is positioned outside the covering portions 4A2a and 4A2b, and the sheet 4D can be folded so as to align the first vertical line VL8 and the second vertical line VL9. Specifically, the circular marks (the first vertical line VL8 and the second vertical line VL9) in FIG. 11 are valley-folded on the sheet 4D and the triangular marks (the third vertical line VL23) in the sheet 4D are mountain-folded so as to align the circular marks on the back side of the triangular marks. Note that the third vertical line VL23 is a straight line that bisects the angle formed by the first vertical line VL8 and the second vertical line VL9.

[0091] Next, as shown in FIG. 12, the intermediate portion IP3 is folded so that the intermediate portion IP3 overlaps the covering portions 4A2a and 4A2b. Specifically, the intermediate portion IP3 is folded by mountain-folding the sheet 4D along the angle bisector DL6 that bisects the angle formed by the first vertical line VL8 and the third vertical line VL23 and the angle bisector DL7 that bisects the angle formed by the second vertical line VL9 and the third vertical line VL23.

[0092] As shown in FIG. 11, the two distances R3 from the rotation center RC2 to one first horizontal line portion LL1h and the other first horizontal line portion LL1i are longer than the distance R4 from the rotation center RC2 to the intermediate first horizontal line portion LL1g. Therefore, as shown in FIG. 12, when the sheet 4D is folded back so that the covering portions 4A2a and 4A2b are rotated about the rotation center RC2 to align the first vertical line VL8 and the second vertical line VL9, the intermediate first horizontal line portion LL1g is arranged at a position farther from the second corresponding portion 4A3 than the one first horizontal line portion LL1h and the other first horizontal line portion LL1i. As a result, it is possible to sufficiently secure the area of the region connecting the region adjacent to one covering portion 4A2a and the region adjacent to the other covering portion 4A2b in the first corresponding portion 4A1.

[0093] In addition, in the above-described fourth embodiment, it is preferable to make a cut in the region sandwiched between the extension lines of the first vertical line VL8 and the second vertical line VL9 in the second corresponding portion 4A3. This makes it easier to bring the second corresponding portion 4A3 into close contact with the periphery of the fixed portion 3c2. Further, by providing a notch CP1 as shown in FIGS. 17 and 18 described later in the region, it becomes easier to bring the second corresponding portion 4A3 into close contact with the periphery of the fixed portion 3c2.

[0094] Note that the present invention is not limited to the above-described embodiment, and for example, the following aspects can also be adopted.

[0095] In the above embodiment, the airtight member 4 is configured by folding at least one sheet 4A to 4D, but an airtight member 4 having a form as shown in FIG. 1 may be used in advance.

[0096] Also, in the above embodiment, the configuration in which the vertical lines VL1, VL2, VL5, VL6, VL8, and VL9 extend to the second horizontal line LL2 has been described. However, as shown in FIGS. 13 to 16, the first and second vertical lines may terminate in front of the second horizontal line LL2.

[0097] FIG. 13 is a plan view showing a sheet 4E according to the fifth embodiment of the present invention. Regarding the same configuration as the sheet 4A according to the first embodiment in the sheet 4E, the same reference numerals are given and the description thereof is omitted.

[0098] In the sheet 4E, the first vertical line VL10 and the second vertical line VL11 are connected to each other at a position closer to the first corresponding portion 4A1 than the second corresponding portion 4A3 in the third vertical line VL3 (rotation center RC3), unlike the sheet 4A of the first embodiment.

[0099] Even when the sheet 4E is used, the intermediate portion IP1 is located outside the two covering portions 4A2a and 4A2b, and the sheet 4E can be folded so that the first vertical line VL10 and the second vertical line VL11 are aligned with each other. Specifically, by rotating the covering portions 4A2a and 4A2b around the rotation center RC3, the round mark can be aligned with the back side of the triangle mark.

[0100] FIG. 14 is a plan view showing a sheet 4F according to the sixth embodiment of the present invention. Regarding the same configuration as the sheet 4E according to the fifth embodiment in the sheet 4F, the same reference numerals are given and the description thereof is omitted.

[0101] In the sheet 4F, the first vertical line VL10 and the second vertical line VL11 are arranged on both sides of the third vertical line VL3 at the same lateral distance from the third vertical line VL3, unlike the sheet 4E of the fifth embodiment. Further, the arrangement changing portions 4A2f to 4A2i of the sheet 4F include a fourth vertical line VL12 and a fifth vertical line VL13 extending in a direction parallel to the third vertical line VL3 from an end portion close to the second corresponding portion 4A3 of the first vertical line VL10 and the second vertical line VL11.

[0102] When using the sheet 4F, by rotating the covering parts 4A2a and 4A2b about the rotation center RC4, which is the virtual intersection of the two vertical lines VL10 and VL11, the two vertical lines VL10 and VL11 are joined behind the third vertical line VL3. Further, the intermediate part IP1 is folded along the angle bisector DL5 of the angle formed by the first vertical line VL10 and the third vertical line VL3 and the angle bisector DL8 of the angle formed by the second vertical line VL11 and the third vertical line VL3. Note that the circles and triangles in FIG. 14 indicate the same folding method as in the above-described embodiment.

[0103] Furthermore, in the sixth embodiment, the sheet 4F is folded in half along the third vertical line VL3 such that the fourth vertical line VL12 and the fifth vertical line VL13 overlap each other. In this state, by folding the folded part along the fourth vertical line VL12 and the fifth vertical line VL13 to one side of the covering parts 4A2a and 4A2b (the direction of the arrow indicating folding toward the covering part 4A2a side in FIG. 14), the sheet 4F can be folded back along the shape of the covering parts 4A2a and 4A2b.

[0104] FIG. 15 is a plan view showing a sheet 4G according to the seventh embodiment of the present invention. For the same configuration as the sheet 4C according to the third embodiment in the sheet 4G, the same reference numerals are given and the description thereof is omitted.

[0105] In the sheet 4G, unlike the sheet 4C according to the third embodiment, the first vertical line VL5 and the second vertical line VL6 terminate at positions in front of the second equivalent part 4A3. Further, the sheet 4G includes a sixth vertical line 14 extending in a direction orthogonal to one first horizontal line part LL1e from the end of the first vertical line VL5 on the second equivalent part 4A3 side, and a seventh vertical line 15 extending in a direction orthogonal to the other first horizontal line part LL1f from the end of the second vertical line VL6 on the second equivalent part 4A3 side.

[0106] Also in the seventh embodiment, similar to the third embodiment, the intermediate portion IP2 can be folded in a state where the first vertical line VL5 and the second vertical line VL6 are combined on the back side of the third vertical line VL7. Note that the circles and triangles in FIG. 15 indicate the same folding method as in the above-described embodiments. Further, in the seventh embodiment, the sheet 4G is folded in half along the third vertical line VL7 so that the sixth vertical line VL14 and the seventh vertical line 15 overlap each other. In this state, by folding the folded portion of the sheet 4G along the sixth vertical line 14 and the seventh vertical line 15 to one side of the covering portions 4A2a and 4A2b, the sheet 4G can be folded back along the shape of the covering portions 4A2a and 4A2b.

[0107] FIG. 16 is a plan view showing a sheet 4H according to an eighth embodiment of the present invention. Regarding the same configuration as the sheet 4D according to the fourth embodiment in the sheet 4H, the same reference numerals are given and the description thereof is omitted.

[0108] In the sheet 4H, unlike the sheet 4D according to the fourth embodiment, the first vertical line VL8 and the second vertical line VL9 terminate at a position in front of the second corresponding portion 4A3. Further, the sheet 4H includes an eighth vertical line VL16 extending in a direction orthogonal to one first horizontal line portion LL1h from an end portion on the second corresponding portion 4A3 side of the first vertical line VL8. Furthermore, the sheet 4H includes a ninth vertical line VL17 extending in a direction orthogonal to the other first horizontal line portion LL1i from an end portion on the second corresponding portion 4A3 side of the second vertical line VL9.

[0109] Also in the eighth embodiment, similar to the fourth embodiment, the sheet 4H is folded back so as to rotate the covering portions 4A2a and 4A2b around the virtual intersection point (rotation center RC5) of the first vertical line VL8 and the second vertical line VL9, whereby the first vertical line VL8 and the second vertical line VL9 are combined and the intermediate portion IP3 can be folded. Note that the circles and triangles in FIG. 16 indicate the same folding method as in the above-described embodiments.

[0110] Furthermore, in the eighth embodiment, the sheet 4H is folded in half along the third vertical line VL23 so that the eighth vertical line VL16 and the ninth vertical line VL17 overlap each other. In this state, by folding the folded portion along the eighth vertical line VL16 and the ninth vertical line VL17 to one side of the covering portions 4A2a and 4A2b, the sheet 4H can be folded back along the shape of the covering portions 4A2a and 4A2b.

[0111] In the above embodiment, the airtight member 4 having the surface material contact portion 4a that is in close contact with the edge of the through hole 2a having a square planar shape in the surface material 2 and the member contact portion 4b that is in close contact with the outer peripheral surface of the fixed portion 3c2 having a square planar shape has been described. However, the shape of the portion to be closely adhered by both the contact portions 4a and 4b is not limited. For example, by using the sheet 4I shown in FIG. 17, an airtight member that can be adhered to the surface material 2 in which the through hole 2a having a rectangular planar shape is formed can also be configured.

[0112] FIG. 17 is a plan view showing a sheet 4I according to a ninth embodiment of the present invention. Regarding the same configuration as that of the sheet 4D according to the fourth embodiment in the sheet 4I, the same reference numerals are given and the description thereof is omitted.

[0113] The sheet 4I has a first corresponding portion 4I1 corresponding to the surface material contact portion 4a, a connection corresponding portion 4I2 corresponding to the connection portion 4c, and a second corresponding portion 4I3 corresponding to the member contact portion 4b.

[0114] Unlike the covering portions 4A2a to 4A2d according to the fourth embodiment, the connection corresponding portion 4I2 includes four covering portions 4I2a to 4I2d and five arrangement changing portions 4I2e to 4I2i.

[0115] Unlike the covering portions 4A2a to 4A2d according to the fourth embodiment, those adjacent to each other via the arrangement changing portions 4I2e to 4I2i in the covering portions 4I2a to 4I2d have different shapes according to the shape of the object to be adhered. Specifically, in the sheet 4I, the covering portion 4I2a and the covering portion 4I2b have different lateral width dimensions.

[0116] Among the arrangement change parts 4I2e to 4I2i, the arrangement change parts 4I2f to 4I2h have a first vertical line VL18 and a second vertical line VL19 that extend from positions spaced apart in the horizontal direction at the first horizontal line LL1 toward the second corresponding part 4A3, and an intermediate part IP4 located between the first vertical line VL18 and the second vertical line VL19. The first horizontal line LL1 has an intermediate first horizontal line part LL1j located between the first vertical line VL18 and the second vertical line VL19, a first horizontal line part LL1k extending from the first vertical line VL18 in a direction away from the intermediate first horizontal line part LL1j, and another first horizontal line part LL1l extending from the second vertical line VL19 in a direction away from the intermediate first horizontal line part LL1j. The intermediate first horizontal line part LL1j is bent with a third vertical line VL20, which is a bisector that bisects the angle between two straight lines connecting the rotation center RC6, which will be described later, and the two vertical lines VL18 and 20, as a boundary. The horizontal length of the first horizontal line part LL1k is shorter than the horizontal length of the other first horizontal line part LL1l. Note that the arrangement change parts 4I2e and 4I2i are connected to each other in a state where the connection corresponding part 4I2 is folded back in a cylindrical shape. Therefore, the arrangement change part 4I2e has the second vertical line VL19 and a part corresponding to a part of the intermediate part IP4. On the other hand, the arrangement change part 4I2i has the first vertical line VL18 and a part corresponding to a part of the intermediate part IP4.

[0117] Also in the ninth embodiment, similar to the fourth embodiment, the sheet 4I is folded back so as to rotate the covering parts 4I2a and 4I2b about the rotation center RC6 that is equidistant from the first vertical line VL18 and the second vertical line VL19, thereby aligning the first vertical line VL18 and the second vertical line VL19 and folding the intermediate part IP4. Note that the circles and triangles in FIG. 17 indicate the same folding method as in the above-described embodiments.

[0118] In the ninth embodiment, a plurality of notches CP1 are provided in the first corresponding part 4I1 and the second corresponding part 4I3 to facilitate folding the sheet 4I so as to form the surface material adhesion part 4a and the member adhesion part 4b.

[0119] In the above embodiment, the formation of the airtight member 4 using a single sheet 4A to 4I has been described. However, the airtight member 4 can also be formed using a plurality of sheets. Examples of cases where it is preferable to use a plurality of sheets include the following. First, in order to configure an airtight member that can be in close contact with a face material 2 having a through-hole formed therein with a polygonal or circular planar shape, or an insertion member 3 having a polygonal or circular outer peripheral surface, the number of covering portions 4A2a to 4A2e may be increased. Second, the area of the arrangement change portions 4A2f to 4A2i may be expanded in the lateral direction in order to secure a wider surplus portion (the filled portions in FIGS. 5 and 10) that functions when the sheet 4A is folded back so that the first corresponding portion 4I1 extends outward from the insertion member 3. Third, the required shape of the covering portions 4A2a to 4A2e may be large. In such cases, the one end portion and the other end portion in the lateral direction in the developed view of the sheet may overlap, and it may not be possible to configure a single sheet.

[0120] In such a case, for example, as shown in the sheet 4J shown in FIG. 18, the airtight member 4 can be configured using two sheets. FIG. 18 is a plan view showing the sheet 4J according to the tenth embodiment of the present invention. Regarding the same configuration as the sheet 4I according to the ninth embodiment in the sheet 4J, the same reference numerals are given and the description thereof is omitted.

[0121] The sheet 4J has two sheet pieces 4Ja and 4Jb. Since the sheet pieces 4Ja and 4Jb have the same configuration, only the configuration of the sheet piece 4Ja will be described below.

[0122] The sheet piece 4Ja has a first corresponding portion 4J1 corresponding to a part of the face material contact portion 4a, a connection corresponding portion 4J2 corresponding to a part of the connection portion 4c, and a second corresponding portion 4J3 corresponding to a part of the member contact portion 4b.

[0123] The connection equivalent part 4J2 includes three covering parts 4J2a, 4J2b, 4J2c and two arrangement change parts 4J2d, 4J2e. Also, the connection equivalent part 4J2 has a line-symmetric shape with respect to the lateral center line CL1 of the covering part 4J2b.

[0124] The covering parts 4J2a, 4J2c have a lateral dimension that is longer than the lateral dimension of the covering part 4J2b.

[0125] The arrangement change parts 4J2d, 4J2e have a first vertical line VL21 and a second vertical line VL22 that extend from positions laterally spaced apart on the first horizontal line LL1 toward the second equivalent part 4J3, and an intermediate part IP5 located between the first vertical line VL21 and the second vertical line VL22. Also, the first horizontal line LL1 has an intermediate first horizontal line part LL1m located between the first vertical line VL21 and the second vertical line VL22, a first one-side horizontal line part LL1n extending from the first vertical line VL21 in a direction away from the intermediate first horizontal line part LL1m, and a first other-side horizontal line part LL1o extending from the second vertical line VL22 in a direction away from the intermediate first horizontal line part LL1m.

[0126] In the sheet 4J, the angle θ1 formed by the first vertical line VL21 and the first one-side horizontal line part LL1n is larger than the angle formed by the second vertical line VL19 and the first other-side horizontal line part LL1l in the ninth embodiment. Therefore, in the state before folding the sheet 4J, the angle of direction conversion of the covering part 4J2a with respect to the covering part 4J2b is larger than the angle of direction conversion of the covering part 4I2a with respect to the covering part 4I2b in the ninth embodiment. Therefore, the sheet 4J cannot be configured as a single sheet, and the sheet 4J is divided into sheet pieces 4Ja, 4Jb.

[0127] In the tenth embodiment, similar to the ninth embodiment, by folding the sheet 4J so as to rotate the covering parts 4J2a, 4J2b about the rotation center RC7 that is equidistant from the first vertical line VL21 and the second vertical line VL22, the first vertical line VL21 and the second vertical line VL22 can be aligned. Note that the circles and triangles in FIG. 18 indicate the same folding method as in the above-described embodiments.

[0128] Also, by folding the sheet 4J in a mountain fold along the bisector DL9 that bisects the angle between the rotation center RC7 and the first vertical line VL21, and the bisector DL10 that bisects the angle between the rotation center RC7 and the second vertical line VL22, the intermediate portion IP5 can be folded. Then, by folding back the sheet 4J along the third vertical line VL20, the covering portions 4J2a and 4J2b can be arranged to face in different directions.

[0129] Furthermore, in the tenth embodiment, after folding both sheet pieces 4Ja and 4Jb as described above, the covering portions 4J2a of the sheet pieces 4Ja and the covering portions 4J2c of the sheet pieces 4Jb are connected to each other to form the cylindrical airtight member 4.

[0130] In the above embodiment, the surface material adhesion portion 4a is exemplified as the first adhesion portion folded back outward from the connection portion 4c, but a member adhesion portion can also be applied as the first adhesion portion. Specifically, in the eleventh embodiment shown in FIG. 19, the plate portion 3a is disposed at a position above the through hole 2a, and another plate portion 3c3 is provided at a position above the through hole 2a and below the plate portion 3a. The another plate portion 3c3 has a back surface extending outward from the outer peripheral surface of the extension body 3c1 over the entire circumference of the extension body 3c1. Since the airtight member 4 according to the eleventh embodiment has the same configuration as the airtight member 4 according to the first embodiment except for the length of the connection portion, the same reference numerals as those in FIG. 1 are used for the airtight member 4 in FIG. 19. On the other hand, in the eleventh embodiment, the reference numeral 4a indicates the member adhesion portion, and the reference numeral 4b indicates the surface material adhesion portion. The member adhesion portion 4b is adhered to the another plate portion 3c3 so as to surround the extension body 3c1. On the other hand, the surface material adhesion portion 4a is adhered to the inner peripheral surface of the through hole 2a over the entire circumference of the through hole 2a.

[0131] In addition, it is preferable that folding lines along each line described as the folding positions of the sheets 4A to 4I are provided in advance on the sheets 4A to 4I. On the other hand, in order to adjust the folding position at the work site, the folding lines can be omitted, or folding lines can be provided in advance at a plurality of positions where folding is assumed.

Explanation of Reference Numerals

[0132] 1 Airtight structure 2 Face material 2a Through hole 3 Insertion member 3a Plate portion 3a1 Front side opening 3a2 Back side opening 3a3 Communication hole 3c2 Fixed portion (an example of a large outer diameter portion) 3b Cylindrical portion 3c Extension portion 4 Airtight member 4A~4I Sheet 4A1, 4I1 First corresponding portion 4A2, 4I2 Connection corresponding portion 4A3, 4I3 Second corresponding portion 4A2a~4A2e, 4I2a~4I2b, 4J2a~4J2c Covered portion 4A2f~4A2i, 4I2e~4I2i, 4J2d~4J2e Arrangement change portion 4a Face material contact portion 4b Member contact portion 4c Connection portion LL1 First horizontal line LL1a, LL1d, LL1g, LL1j, LL1m Intermediate first horizontal line portion LL1b, LL1e, LL1h, LL1k, LL1n One first horizontal line portion LL1c, LL1f, LL1i, LL1l, LL1o The other first horizontal line portion LL2 Second horizontal line VL1, VL5, VL8, VL10, VL18, VL21 First vertical line VL2, VL6, VL9, VL11, VL19, VL22 Second vertical line IP1~IP5 Intermediate portion

Claims

1. An airtight structure comprising: a face member having a through-hole; an insertion member extending from the front side to the back side of the face member through the through-hole; an airtight member provided across the face member and the insertion member so as to fill a gap between the face member and the insertion member; the insertion member having a plate portion having a front surface and a back surface, a cylindrical portion extending from the front surface of the plate portion to the front side and having an internal space, and an extension portion extending from the back surface of the plate portion to the back side; the plate portion having a front-side opening opening toward the front side within the internal space and a back-side opening opening toward the back side at a position deviated from the extension portion, and a communication hole extending from the front surface to the back surface being formed; the airtight member having a face-member adhesion portion for closely adhering to the entire circumference of the edge portion of the through-hole in the face member, a member adhesion portion for closely adhering to the entire circumference of the outer peripheral surface of the insertion member at a position on the back side of the plate portion, and a connection portion connecting the member adhesion portion and the face-member adhesion portion so as to surround the insertion member over the entire circumference between the member adhesion portion and the face-member adhesion portion.

2. One of the first adhesion portions of the face-member adhesion portion and the member adhesion portion extends from the connection portion in an outer direction away from the insertion member; The connection portion has an expansion portion that expands in an outer direction as it goes from the first adhesion portion toward the other second adhesion portion of the face-member adhesion portion and the member adhesion portion. The airtight structure according to Claim 1.

3. The first adhesion portion is the face-member adhesion portion for closely adhering to the front surface of the face member; The second adhesion portion is the member adhesion portion for closely adhering to the outer peripheral surface of the large outer diameter portion of the insertion member provided at a position on the back side of the face member and having an outer peripheral surface larger than the inner peripheral surface of the through-hole in a plan view looking from the front side to the back side; The expansion portion extends from the face-member adhesion portion through the through-hole toward the back side of the face member. The airtight structure according to Claim 2.

4. The airtight member has a first corresponding portion corresponding to at least a part of the first adhesion portion, a connection corresponding portion adjacent to the first corresponding portion in a longitudinal direction orthogonal to the lateral direction via a first horizontal line extending in the lateral direction and corresponding to at least a part of the connection portion, and a second corresponding portion adjacent to the connection corresponding portion in the longitudinal direction on the opposite side of the first corresponding portion via a second horizontal line extending in the lateral direction and corresponding to at least a part of the second adhesion portion, and includes a single sheet having foldable characteristics and airtightness. The connection equivalent part includes two covering parts arranged in the lateral direction to cover the insertion member from the outside, and an arrangement change part provided between the two covering parts, where the outer diameter of the part formed by the two covering parts increases as it goes from the first equivalent part to the second equivalent part, and the arrangement change part is folded back so as to change the relative orientation of the two covering parts. The airtight structure according to claim 2 or 3.

5. The arrangement change part includes a first vertical line and a second vertical line extending from positions spaced apart in the lateral direction at the first horizontal line toward the second equivalent part, and an intermediate part located between the first vertical line and the second vertical line. The intermediate part is located outside the two covering parts and has the property of being foldable so as to bring the first vertical line and the second vertical line together. The airtight structure according to claim 4.

6. The first horizontal line includes an intermediate first horizontal line part located between the first vertical line and the second vertical line, one first horizontal line part extending from the first vertical line in a direction away from the intermediate first horizontal line part, and the other first horizontal line part extending from the second vertical line in a direction away from the intermediate first horizontal line part. The one first horizontal line part is arranged to form an obtuse angle with the first vertical line. The other first horizontal line part is arranged to form an obtuse angle with the second vertical line. The airtight structure according to claim 5.

7. The one first horizontal line part and the other first horizontal line part are arranged on the same straight line in the state before the sheet is folded back. The airtight structure according to claim 6.

8. The first vertical line and the second vertical line extend parallel from the first horizontal line toward the second horizontal line in the state before the sheet is folded back, or extend away from each other as they go toward the second horizontal line. The airtight structure according to claim 6.

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