Opening device

Abstract

To provide an opening structure placed in an opening capable of improving fire retardant properties and workability.SOLUTION: An opening structure includes: an installation accessory fixed to the inner circumference of an opening; a framing material placed around the inner circumference of the installation accessory; and a fireproof glass attached to the framing material. The installation accessory consists of multiple divided auxiliary materials placed side by side in a mitsuke direction along the inner circumference of the opening. The multiple divided auxiliary materials includes: a mikomi (depth) wall fixed to the inner circumference of the opening; a mitsuke (front) wall on the indoor side that extends from the indoor side of the mikomi (depth) wall to the inner circumference; and a mitsuke (front) wall on the outdoor side extending from the outdoor side to the inner circumference of the mikomi (depth) wall. The gaps between the mitsuke walls on the indoor side and the gaps between the mitsuke (front) walls on the outdoor side are fixed to the inner periphery of the opening, with the gap being shifted in the mitsuke direction of the opening.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to an opening device disposed in an opening of a building or the like.

Background Art

[0002] Conventionally, an opening device such as a fitting in which a frame body is fixed to an opening has been known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an opening device disposed in an opening of a building or the like, it is required to improve fire resistance and workability.

[0005] An object of the present invention is to improve fire resistance and workability of an opening device disposed in an opening of a building or the like.

Means for Solving the Problems

[0006] The opening device according to the embodiment includes a mounting auxiliary member fixed to the inner periphery of the opening, a frame member supported on the inner peripheral side of the mounting auxiliary member, and a fireproof glass attached to the frame member. The mounting auxiliary member is composed of a plurality of divided auxiliary members arranged side by side in the finding direction along the inner periphery of the opening. Each of the plurality of divided auxiliary members has a prospective wall fixed to the inner periphery of the opening, an indoor finding wall extending from the indoor side of the prospective wall to the inner periphery, and an outdoor finding wall extending from the outdoor side of the prospective wall to the inner periphery. The opening device is fixed to the inner periphery of the opening in a state where the gaps between the indoor finding walls and the gaps between the outdoor finding walls are shifted in the finding direction.

Effects of the Invention

[0007] According to the embodiment, it is possible to improve the fire resistance and workability of an opening device disposed at an opening of a building or the like.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0009] As an example of the opening device of the embodiment, an example of a FIX window installed in an opening on the indoor side of a curtain wall P arranged on the outer periphery of a building will be described with reference to the drawings.

[0010] (Configuration of the Curtain Wall) The curtain wall P arranged on the outer peripheral surface of the building is configured by attaching a panel body C such as glass to a curtain wall frame in which a blind B is arranged between a plurality of mullions A arranged on the outer periphery of the building.

[0011] The plurality of mullions A are arranged at intervals in the left-right direction and are connected to the building body. As shown in FIG. 2, the mullion A has a mullion main body portion A1 having a hollow portion extending in the vertical direction on the indoor side, and has recesses A2, A2 for attaching the panel body C on the left and right sides on the outdoor side of the mullion main body portion A1.

[0012] In the vertical frame A, an auxiliary vertical frame A3 is inserted into the indoor side of the recess A2, and a panel inter-column groove is formed by the outdoor wall A4 of the vertical frame A and the auxiliary vertical frame A3. A panel body C such as double glazing is held via a backup material b, a sealing material s, etc.

[0013] At each predetermined height in the recess A2 of the vertical frame A, a seamless mounting member (not shown) is attached by bolts or the like, and a seamless B is supported by the seamless mounting members of the adjacent vertical frames A and A and fixed to the vertical frame A.

[0014] As shown in Fig. 1, the seamless B has a panel inter-column groove for holding the panel body C vertically. A panel body C such as double glazing is held via a backup material b, a sealing material s, etc.

[0015] On the indoor side surface of the seamless B, a steel material D having a projected wall D1 extending indoors is connected, and a non-combustible material E is arranged on the inner peripheral surface of the projected wall D1 to form the inner periphery of the opening on the indoor side of the curtain wall P.

[0016] (Configuration of the entire FIX window) As shown in Figs. 1 and 2, the FIX window of this embodiment includes a mounting auxiliary material 2 fixed to the inner periphery of the opening, a frame material 1 attached to the inner periphery of the mounting auxiliary material 2, and a panel body 15 having fire resistance such as fireproof glass attached to the frame material 1.

[0017] The mounting auxiliary material 2 is made of a metal material such as an aluminum alloy and is a long member having the same cross-sectional shape on each side of the inner periphery of the opening.

[0018] The mounting auxiliary material 2 preferably has a length dimension approximately the same as the finding dimension of the inner periphery of the opening, and is preferably arranged so that no gap is generated between the outer periphery of the mounting auxiliary material 2 and the inner peripheral surface of the opening when the mounting auxiliary material 2 is arranged around the four sides of the opening. The mounting auxiliary material 2 may be composed of a plurality of divided auxiliary materials divided in the longitudinal direction.

[0019] The mounting auxiliary materials 21 and 22 fixed to the upper inner peripheral surface and the lower inner peripheral surface of the opening are arranged with a non-combustible material E sandwiched between them on the prospective wall D1 of the steel material D, and are fixed by fixing means b1 such as drill screws. The mounting auxiliary materials 23 and 23 fixed to the left and right inner peripheral surfaces of the opening are arranged on the prospective surface of the square post A, and are fixed by fixing means b1 such as drill screws.

[0020] The frame members 1 (upper frame member 11, lower frame member 12, and vertical frame member 13) are made of a metal material such as an aluminum alloy, have a frame body (upper frame body 111, lower frame body 121, and vertical frame body 113) and pressing edges 112, 122, and 132, and are long members having the same cross-sectional shape on each side of the inner periphery of the opening.

[0021] The upper frame member 11, lower frame member 12, and left and right vertical frame members 13 and 13 attached to the inner peripheral side of the mounting auxiliary material 2 and arranged around the opening have a glass holding groove on the inner periphery. A setting block 125 is installed in the glass holding groove of the lower frame member 12, and a panel body 15 having fire resistance such as a fireproof glass is fitted therein, and a FIX window is provided on the indoor side of the curtain wall P.

[0022] Hereinafter, the mounting auxiliary material 2 and the frame member 1 forming the frame of the FIX window will be further described with reference to FIGS. 3 and 4, taking the mounting auxiliary material 22 and the lower frame member 12 of the lower frame portion as an example. Since the mounting auxiliary material 21 and the upper frame member 11 of the upper frame portion and the mounting auxiliary material 23 and the vertical frame member 13 of the vertical frame portion have the same configuration, the description thereof will be omitted here.

[0023] The mounting auxiliary material 22 has a prospective wall 22a fixed to the inner periphery of the opening, an indoor finding wall 22b extending from the indoor side end of the prospective wall 22a to the inner periphery, and an outdoor finding wall 22b extending from the outdoor side end of the prospective wall 22a to the inner periphery. Two ribs 22c and 22c are formed along the longitudinal direction on the inner peripheral surface of the prospective wall 22a.

[0024] The attachment auxiliary material 22 is arranged on the inner peripheral surface of the non-combustible material E, and a projected wall 22a is fixed to the inner peripheral surface (steel material D) of the opening by fixing means b1 such as a drill screw between two ribs 22c, 22c at an appropriate position in the longitudinal direction.

[0025] As shown in FIGS. 2 and 4, the attachment auxiliary material 22 of the present embodiment is composed of two divided auxiliary materials 221, 221 divided at the center in the longitudinal direction, and a gap s1 sufficient to absorb the elongation of the attachment auxiliary material 22 in case of fire is provided between the adjacent divided auxiliary materials 221, 221 in the finding direction, and it is fixed to the inner periphery of the opening. The two divided auxiliary materials 221 have the same configuration, and by rotating 180 degrees, they can be used both as the divided auxiliary material 221 arranged on the left vertical frame side in the finding direction and the divided auxiliary material 221 arranged on the right vertical frame side in the finding direction.

[0026] When the two divided auxiliary materials 221, 221 are fixed to the inner periphery of the opening with a gap s1, they are fixed so that the gap between the finding walls 221b, 221b on the indoor side and the gap between the finding walls 221b, 221b on the outdoor side are shifted in the longitudinal direction (finding direction) of the frame material.

[0027] Specifically, as shown in FIG. 4(c), the divided auxiliary material 221 is formed such that the finding dimension L1 of one finding wall 221b is larger than the finding dimension L2 of the other finding wall 221b, and the end face position of one finding wall 221b and the end face position of the other finding wall 221b are different in the finding direction.

[0028] And the divided auxiliary material 221 is formed in a crank shape having a first projected side h1 cut in the projected direction at the end face position of one finding wall 221b, a second projected side h2 cut in the projected direction at the end face position of the other finding wall 221b, and a finding piece h3 connecting the first projected side h1 and the second projected side h2 on the side of the projected wall 221a opposite to the facing side.

[0029] The dividing auxiliary materials 221, 221 are formed such that the dimension of one expected side h1 is equal to or less than the dimension of the other expected side h2. When the sides formed in a crank shape are arranged opposite to each other, the finding walls 221b, 221b on one side can be arranged in a straight line in the finding direction in a state where they overlap in the expected direction.

[0030] In the present embodiment, the dividing auxiliary material 221 arranged on the left vertical frame side is arranged such that the finding wall 221b on one side having a long finding dimension L1 becomes the outdoor finding wall 21b, and the dividing auxiliary material 221 arranged on the right vertical frame side is arranged such that the finding wall 221b on one side having a long finding dimension L1 becomes the indoor finding wall 21b. The outdoor finding wall 221b of the dividing auxiliary material 221 arranged on the left vertical frame side and the indoor finding wall 221b of the dividing auxiliary material 221 arranged on the right vertical frame side overlap.

[0031] The lower frame member 12 has a lower frame main body 121 arranged and fixed on the inner peripheral side of the mounting auxiliary material 22, and a pressing edge 122 attached to the lower frame main body 121.

[0032] The lower frame main body 121 has a bottom wall portion 121a constituting a glass holding groove 12a for holding the panel body 15, an indoor finding wall 121b extending in the inner peripheral direction from the outdoor side of the bottom wall portion 121a, a prospective wall 121c extending in the outdoor direction from the inner peripheral end of the indoor finding wall 121b, and an outdoor finding wall 121d extending in the outer peripheral direction from the outdoor side end of the prospective wall 121c. A first pressing edge engaging portion 121e for engaging with the outdoor side end of the pressing edge 122 is provided on the upper surface of the bottom wall portion 121a, and a second pressing edge engaging portion 121f for engaging with the lower surface of the pressing edge 122 is provided at the indoor side end of the bottom wall portion 121a.

[0033] The lower frame main body 121 has the lower end of the outdoor finding wall 121d bent inward, and an auxiliary material mounting portion 12b having a substantially U-shaped cross section opening downward (outer peripheral direction) on the outdoor side of the bottom wall portion 121a is formed by the indoor finding wall 121b, the prospective wall 121c, and the outdoor finding wall 121d.

[0034] The lower frame body 121 is provided with an airtight material mounting portion 121g that protrudes inwardly toward the interior at an upper (inner peripheral side) portion of the interior side finding wall 121b. Note that the lower frame body 121 may be formed with marks or the like indicating positions for fixing fixing means b3 such as drill screws to the interior side finding wall 121b of the auxiliary material mounting portion 12b at appropriate positions in the longitudinal direction.

[0035] The dimension between the outdoor side surface of the interior side finding wall 121b of the lower frame body 121 and the lower end (the interior side end that bends inwardly) of the outdoor side finding wall 121d is larger than the dimension between the outer side surfaces of the interior and exterior finding walls 22b, 22b of the mounting auxiliary material 22, and the interior and exterior finding walls 22b, 22b of the mounting auxiliary material 22 can be covered from the inner peripheral side and slidably fitted in the inner and outer peripheral directions.

[0036] By disposing a spacer 124 having an appropriate thickness dimension between the bottom wall portion 121a of the lower frame body 121 disposed on the inner periphery of the mounting auxiliary material 22 and the inner peripheral surface of the opening, the height position (finding direction position) of the lower frame body 121 can be set, and the load when the panel body 15 is fitted can be borne.

[0037] The pressing edge 122 has a glass holding wall 122a that constitutes the interior side wall of the glass holding groove 12a, an engaging wall 122b that extends outwardly from a position below (outer peripheral side) the center in the height (inner and outer peripheral) direction on the outdoor side surface of the glass holding wall 122a, an inclined wall 122c that extends outwardly and downward (outer peripheral side) from the outdoor side of the engaging wall 122b, and an engaging portion 122d that extends outwardly from the outdoor side end of the inclined wall 122c.

[0038] The pressing edge 122 is attached to the lower frame body 121 by engaging the engaging portion 122d with the first pressing edge engaging portion 121e of the lower frame body 121 from the interior side and locking the corner portion between the inclined wall 122c and the lower frame body 121 with the second pressing edge engaging portion 121f of the lower frame body 121 at the lower surface (outer peripheral surface) of the engaging wall 122b. Further, the engaging portion 122d engaged with the first pressing edge engaging portion 121e and the bottom wall portion 121a of the lower frame body 121 may be fastened and fixed to the spacer 124 by fixing means b4 such as screws from the inner peripheral side. Note that the engaging wall 122b of the pressing edge 122 may be provided with a corner portion 122e formed at a right angle to the continuous portion with the inclined wall 122c by extending the inclined wall 122c after bending the outdoor side end downward (outer peripheral side).

[0039] The pressing edge 122 attached to the lower frame body 121 covers the indoor side of the bottom wall portion 121a of the lower frame body 121 in a state where the lower end (outer peripheral end) of the glass holding wall 122a is separated from the inner peripheral surface of the opening.

[0040] The setting block 125 is disposed in the glass holding groove 12a of the lower frame member 12 fixed to the lower inner peripheral surface of the opening, and the panel body 15 is held. The configurations of the mounting auxiliary material 2 and the frame material 1 forming the frame of the FIX window have been described above.

[0041] (Construction procedure of FIX window) The construction of the FIX window can be carried out according to the following procedure example. Procedure 1: Mounting of the lower frame mounting auxiliary material and the upper frame mounting auxiliary material Procedure 2: Mounting of the vertical frame mounting auxiliary material Procedure 3: Mounting of the lower frame body of the lower frame member Procedure 4: Mounting of the vertical frame body of one side vertical frame member Procedure 5: Mounting of the upper frame body of the upper frame member and the vertical frame body of the other side vertical frame member Procedure 6: Mounting of the glass panel and the pressing edge The following describes each procedure.

[0042] Procedure 1: Mounting of the lower frame mounting auxiliary material and the upper frame mounting auxiliary material Attach the lower mounting auxiliary material 22 to the lower inner peripheral surface of the opening with the drill screw b1, and attach the upper mounting auxiliary material 21 to the upper inner peripheral surface of the opening with the drill screw b1. When the mounting auxiliary materials 21 and 22 are composed of a plurality of divided auxiliary materials 211 and 221 divided in the longitudinal (left - right) direction, align the outer peripheral side ends of the divided auxiliary materials 211 and 221 with the left - right inner peripheral surfaces of the opening and attach them so that a gap is generated between the members. At this time, pay attention to ensure that the left and right split auxiliary materials 211 and 221 do not shift in the expected direction, that is, they are fixed in a state where the left and right split auxiliary materials 211 and 221 are aligned in a straight line.

[0043] Procedure 2: Installation of the mounting auxiliary material for the vertical frame Attach the left and right mounting auxiliary materials 23 and 23 to the left and right inner peripheral surfaces of the opening with drill screws b1. When the mounting auxiliary material 23 consists of a plurality of members split in the longitudinal (up and down) direction, align the outer peripheral side end of the lower member of the mounting auxiliary material 23 with the upper surface of the lower frame mounting auxiliary material 22, and align the outer peripheral side end of the upper member of the mounting auxiliary material 23 with the upper surface of the upper frame mounting auxiliary material 21, and attach them so that a gap is formed between the members of the mounting auxiliary material 23.

[0044] Procedure 3: Installation of the lower frame body of the lower frame material Place the lower frame body 121 of the lower frame material 12 on the lower inner peripheral surface of the opening so that the mounting auxiliary material 22 is inserted into the auxiliary material mounting portion 12b, and fix the indoor side finding wall 121b of the lower frame body 121 and the indoor side finding wall 22b of the mounting auxiliary material 22 with drill screws b3. When fixing the lower frame body 121 with drill screws b3, a spacer 124 may be placed below the bottom wall portion 121a of the lower frame body 121 to position the height of the lower frame body 121.

[0045] Procedure 4: Installation of the vertical frame body of one side vertical frame material Place the vertical frame body 131 of one side vertical frame material 13 on the vertical inner peripheral surface of the opening so that the mounting auxiliary material 23 is inserted into the auxiliary material mounting portion 13b, and fix the indoor side finding wall 131b of the vertical frame body 131 and the indoor side finding wall 23b of the mounting auxiliary material 23 with drill screws b3. When installing the vertical frame body 131, align the lower end surface of the vertical frame body 131 with the lower frame corner piece arranged at the end of the lower frame material 12.

[0046] Procedure 5: Installation of the upper frame body of the upper frame material and the vertical frame body of the other side vertical frame material While inserting the mounting auxiliary member 21 into the auxiliary member mounting portion 11b, move the upper frame body 111 of the upper frame member 11 so that one end of the upper frame body 111 enters between the upper end of one vertical frame body 131 and the upper inner peripheral surface of the opening, and finally temporarily arrange it along the upper inner peripheral surface. Next, while inserting the mounting auxiliary member 23 into the auxiliary member mounting portion 13b, move the other vertical frame body 131 toward the vertical inner peripheral surface so that it enters between the upper frame body 111 and the lower frame body 121, and finally temporarily install it along the vertical inner peripheral surface.

[0047] With the upper frame body 111 and the other vertical frame body 131 temporarily installed, install the upper and lower ends of the left and right vertical frame bodies 131 in alignment with the upper frame corner pieces arranged at both ends of the upper frame body 111 and the lower frame corner pieces arranged at both ends of the lower frame body 121 so that there are no gaps between the upper and lower ends of the left and right vertical frame bodies 131 and the upper frame body 111 and the lower frame body 121.

[0048] When the four-sided frame is formed, fix the indoor finding wall 111b of the upper frame body 111 and the indoor finding wall 21b of the mounting auxiliary member 21 with the drill screw b3, and fix the indoor finding wall 131b of the other vertical frame body 131 and the indoor finding wall 23b of the mounting auxiliary member 23 with the drill screw b3. Note that an airtight material such as a bead material is attached in advance to the airtight material mounting portion 121g of the lower frame body 121 (and the upper frame body 111 and the vertical frame body 131).

[0049] Procedure 6: Installation of the glass panel and attachment of the edge trim Attach the edge trim 122 to the lower frame body 121 fixed to the inner periphery of the opening and fix it with fixing means b4 such as screws. Then, install the panel body 15 inside the frame via the setting block 125.

[0050] After installing the panel body 15, attach the edge trims 112 and 132 to the upper frame body 111 and the left and right vertical frame bodies 131, and insert the retrofitted bead between the panel body 15 and the edge trims 112, 122, and 132 to complete the construction. The construction procedure of the FIX window has been described above.

[0051] (Effect of the opening device of this embodiment) As described above, the opening device of this embodiment arranges the mounting auxiliary material on the inner periphery of the opening, and the frame body is slidably fitted in the inner and outer circumferential directions so as to cover the mounting auxiliary material, so that the position of the frame body can be adjusted according to the dimensional error of the opening, etc., and the workability can be improved.

[0052] The opening device of this embodiment is composed of a plurality of divided auxiliary materials in which the mounting auxiliary material is divided in the longitudinal direction, and the plurality of divided auxiliary materials are arranged side by side in the finding direction with a gap therebetween. Therefore, when thermal expansion occurs in the mounting auxiliary material during a fire, the gap between the divided auxiliary materials can absorb the amount of thermal expansion, and deformation of the mounting auxiliary material in the inner circumferential direction can be suppressed.

[0053] The opening device of this embodiment fixes the plurality of divided auxiliary materials so that the gaps between the finding walls on the outdoor side and the gaps between the finding walls on the indoor side are offset in the longitudinal direction. Therefore, a gap that penetrates straight in the finding direction is not formed in the finding wall of the mounting auxiliary material, and direct communication between the indoor and outdoor can be suppressed.

[0054] The opening device of this embodiment forms the mounting auxiliary material by the finding wall and the finding walls on the indoor side and the outdoor side, and fits and attaches the finding wall of the mounting auxiliary material to the auxiliary material mounting portion of the frame body. Therefore, the fixing portion of the mounting auxiliary material that supports the frame material to the opening can be protected, and the fireproof performance can be improved. In addition, by covering the indoor finding wall of the mounting auxiliary material from the indoor side with the pressing edge, the mounting auxiliary material can be further protected, and the fireproof performance can be further improved.

[0055] Since the mounting auxiliary material and the glass holding groove of the opening device of this embodiment can be arranged side by side in the finding direction, the finding of the frame material can be reduced, and the indoor finding wall of the pressing edge attached to the indoor side of the frame body is attached to the inner peripheral surface of the opening with a gap therebetween. In this way, a sense of depth can be given to the frame material, and the design property can be improved.

[0056] In the opening device of this embodiment, the frame body and the pressing edge are engaged in the indoor-outdoor direction with the first pressing edge engaging portion provided on the bottom wall portion of the frame body and the engaging portion provided at the outdoor side end of the pressing edge, and the second engaging portion provided at the indoor side end of the frame body and the corner portion formed on the lower surface of the pressing edge are engaged in the inner-outer peripheral direction. Therefore, it can be firmly attached to both the finding direction and the prospective direction.

[0057] Further, since the engaging portion of the pressing edge is provided via the inclined portion from the engaging wall, the engaging portion of the pressing edge can be easily inserted into the concave portion between the first pressing edge engaging portion and the second pressing edge engaging portion provided on the frame body, and the engagement from the indoor side to the first pressing edge engaging portion is easy.

[0058] -Other Embodiments- The mounting auxiliary member 22 may be formed by three or more divided auxiliary members, or may be formed by two divided auxiliary members 221 having different longitudinal dimensions. Further, the side of the divided auxiliary member 221 on the opposite side of the prospective wall 221a may be cut obliquely. In addition, when the mounting auxiliary member 22 is formed by three or more divided auxiliary members, the divided auxiliary member 221 arranged in the center may form crank-shaped opposing portions at both ends.

[0059] The fixing of the mounting auxiliary member 22 and the lower frame body 121 is not limited to drill screws. For example, screw holes may be formed in the finding wall 22b of the mounting auxiliary member 22 and the indoor side finding wall 121b of the lower frame body 121, and they may be fixed by fixing means such as screws through the screw holes. In that case, the screw holes formed in the mounting auxiliary member 22 or the lower frame body 121 may be formed as long holes so that the lower frame body 121 can be fixed to the mounting auxiliary member 22 in a vertically position-adjustable manner.

[0060] The opening to which the opening device is attached is not limited to the opening formed on the indoor side of the curtain wall. The opening device may be, for example, an inner window constructed in the indoor side opening of an existing FIX window arranged on the outdoor side. Further, the sealing material for sealing between each frame member of the opening device and the panel body 15 is not limited to a dry airtight material such as a bead material, and may be a wet seal by filling the sealing material after arranging a backup material.

[0061] Furthermore, the materials of the upper frame member, lower frame member, and vertical frame member of the opening device are not particularly limited, and may be metal materials such as stainless steel or aluminum, or other flame-retardant materials.

[0062] The above embodiments do not limit the invention described in the claims, and it goes without saying that they are treated as examples.

Explanation of Reference Numerals

[0063] 1: Frame member 12: Lower frame member 12a: Glass holding groove 12b: Fitting attachment portion 121: Lower frame body 122: Pressing edge 22: Mounting auxiliary material 221: Dividing auxiliary material 221a: Anticipated wall 221b: Found wall 15: Panel body (fireproof glass)

Claims

Claim 1 An attachment auxiliary member fixed to the inner periphery of the opening, a frame member supported on the inner peripheral side of the attachment auxiliary member, and a fireproof glass attached to the frame member, The attachment auxiliary member is composed of a plurality of divided auxiliary members arranged side by side in the finding direction along the inner periphery of the opening, Each of the plurality of divided auxiliary members has a prospective wall fixed to the inner periphery of the opening, an indoor finding wall extending from the indoor side of the prospective wall to the inner periphery, and an outdoor finding wall extending from the outdoor side of the prospective wall to the inner periphery. The gaps between the indoor finding walls and the gaps between the outdoor finding walls are fixed to the inner periphery of the opening in a state where they are displaced in the finding direction. An opening device.

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