Sound insulation cover and sound insulation structure using sound insulation cover

Abstract

To provide a sound insulation cover capable of suppressing generation of a large gap at a joint part to prevent sound leakage from the joint part, and capable of being mounted on an outside surface of a pipe part with a proper tightening level regardless of an operator, and a sound insulation structure using the sound insulation cover.SOLUTION: A sound insulation cover 1 comprises a joint part J that can freely connect one end side portion 1A and the other end side portion 1B in a cover width direction X, which are arranged close to each other in a mounting posture in which they are annularly wrapped around an outside surface of a pipe part. The joint part J is composed of an insertion side extension member 3 having an insert part 31 and extending along an edge part of the one end portion 1A, and an inserted side extension member 4 having an inserted part 41 and extending along an edge part of the other end portion 1B. The insertion part 31 is configured to be freely inserted into the inserted part 41 in an arrangement state in which the insertion side extension member 3 and the inserted side extension member 4 overlap in a cover inner / outer direction Z.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a sound-insulating cover and a sound-insulating structure using the sound-insulating cover, and in particular to a flexible sound-insulating cover that is attached to the outer surface of a pipe section arranged in a building in an attachment position in which it is wrapped around the outer surface of the pipe section in a ring shape, and a sound-insulating structure using the sound-insulating cover. [Background technology]

[0002] As an example of this type of sound insulation cover, there is known a joint part that can freely connect one end part and the other end part in the cover width direction that are arranged close to each other in an installation position in which the cover is wrapped around the outer surface of the pipe part in a ring shape, as shown in the following Patent Documents 1 and 2. Since the sound insulation cover itself is provided with a joint part in this way, the sound insulation cover can be easily attached to the outer surface of the pipe part without having to separately prepare a connector such as adhesive tape.

[0003] In the soundproof cover described in Patent Document 1, the above-mentioned joint portion is configured with a snap button having a female snap button (156) arranged at a predetermined interval along the edge of one end portion in the width direction of the cover, and a male snap button (158) arranged at a predetermined interval along the edge of the other end portion in the width direction of the cover. Also, in the soundproof cover described in Patent Document 2 below, the above-mentioned joint portion is configured with a hook-and-loop fastener having a band-like loop surface (26a) raised in a loop shape extending along the edge of one end portion in the width direction of the cover, and a band-like hook surface (26b) raised in a loop shape extending along the edge of the other end portion in the width direction of the cover. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2022-83408 [Patent Document 2] JP 2019-27577 A Summary of the Invention [Problem to be solved by the invention]

[0005] When the soundproofing cover described in Patent Document 1 is attached to the outer surface of the tube section, relatively large gaps are created between the snap buttons in the longitudinal direction of the joint section (longitudinal direction of the cover), which means that sound may leak out from these large gaps, leaving room for improvement in terms of soundproofing performance. Although the sound insulation cover described in Patent Document 2 does not have a large gap at the joint, the hook-and-loop fastener allows a high degree of freedom in changing the fastening position (joint position), so the joint position when attaching it to the outer surface of the pipe is likely to change depending on the worker. Therefore, there is a concern that the expected sound insulation performance of the sound insulation cover will not be achieved if the degree of fastening (degree of adhesion) to the outer surface of the pipe is too small or too large compared to the appropriate degree of fastening.

[0006] In view of this situation, the main object of the present invention is to provide a sound-proofing cover and a sound-proofing structure using a sound-proofing cover that can prevent sound leakage from the joint by preventing the formation of large gaps at the joint, and that can be attached to the outer surface of the pipe with an appropriate tightness regardless of the worker. [Means for solving the problem]

[0007] A first characteristic configuration of the present invention is a flexible sound-insulating cover that is attached to the outer surface of a pipe section arranged in a building in a ring-shaped wrapping manner, The cover is provided with a joint portion that can freely connect one end portion and the other end portion in the width direction of the cover that are arranged adjacent to each other in a mounting position in which the cover is wrapped around the outer surface of the pipe portion in a ring shape, the joint portion is composed of a fitting-side extending member having a fitting portion and extending along an edge portion of one end portion in the width direction of the cover, and a fitted-side extending member having a fitted portion and extending along an edge portion of the other end portion in the width direction of the cover, The fitting portion of the fitting side extending member and the fitted portion of the fitted side extending member are configured to be freely fitted into each other in an arrangement in which the fitting side extending member and the fitted side extending member overlap in the inside and outside directions of the cover.

[0008] According to this configuration, in an installation state in which one end portion and the other end portion in the width direction of the cover are connected at the joint portion in an installation position wrapped around the outer surface of the tube portion, the fitting-side extending member and the fitted-side extending member are arranged overlapping in the inside-outside direction of the cover, so that the overlapping arrangement of both extending members can suppress the formation of a large gap at the joint portion and prevent sound leakage from the joint portion. Moreover, at the joint portion, the fitting portion of the fitting-side extending member and the fitted portion of the fitted-side extending member are fitted into each other at a fixed fitting position, so that the one end portion and the other end portion in the width direction of the cover can be reliably connected at a fixed joint position, and the cover can be attached to the outer surface of the tube portion with an appropriate tightening level regardless of the operator.

[0009] A second characteristic feature of the present invention is that the fitting portion of the fitting-side extending member and the fitted portion of the fitted-side extending member extend continuously along the edge portion in the width direction of the cover.

[0010] According to this configuration, when the joint is attached to the outer surface of the tube, the fitting area between the fitting portion of the fitting-side extending member and the fitted portion of the fitted-side extending member extends continuously along the edge of the cover width direction, so that a long fitting area that is continuous along the edge of the cover width direction can be secured. This makes it possible to prevent the joint from coming off, and the long fitting area can further prevent sound leakage from the joint.

[0011] A third characteristic configuration of the present invention is that the fitted portion of the fitted-side extending member is configured as a concave portion that opens toward the center side in the cover width direction at an edge portion of the other end side portion in the cover width direction, The fitting portion of the fitting side extension member is configured so as to be freely fitted into the concave portion from the center side in the cover width direction at the other end side portion in the cover width direction when in an installation position in which it is wrapped in a ring shape around the outer surface of the tube portion.

[0012] When the one end side portion and the other end side portion of the cover in the width direction are connected to the joint portion to be in the attached state, the cover is tightened to the reduced diameter side by the operating force of the operator, and the fitting portion of the fitting-side extending member is fitted into the concave portion (fitted portion). At this time, according to this configuration, since the concave portion opens toward the center side in the width direction of the cover, the fitting direction of the fitting portion into the concave portion is from the center side in the width direction of the cover, not from the end side in the width direction of the cover. Therefore, the direction in which the fitting portion comes off the concave portion can be the direction in which the one end side portion in the width direction of the cover is moved toward the center side in the width direction of the cover at the other end side portion in the width direction of the cover, that is, the direction in which the cover is further tightened to the reduced diameter side from the attached state to the outer surface of the pipe portion by the operating force of the operator. Therefore, it is possible to prevent the joint portion from coming off unexpectedly in a situation unintended by the operator.

[0013] The fourth characteristic configuration of the present invention is that, in an installation position in which the cover is wrapped in a ring shape around the outer surface of the tube portion, an elastic deformation portion is provided which allows the cover to elastically deform toward the narrowing diameter side beyond the fitting position between the fitting portion of the fitting side extending member at one end side of the cover width direction and the concave portion of the fitted side extending member at the other end side of the cover width direction.

[0014] According to this configuration, in the mounting position in which the cover main body is wrapped in a ring shape around the outer surface of the tube portion, the fitting portion at one end portion in the cover width direction can be moved beyond the fitting position to the cover diameter reduction side (to the center side in the cover width direction at the other end portion in the cover width direction) by the elastic deformation of the elastic deformation portion. Then, from that state, the fitting portion at one end portion in the cover width direction can be fitted from the center side in the cover width direction at the other end portion in the cover width direction into the concave portion (fitted portion) of the other end portion by utilizing the elastic restoration of the elastic deformation portion. In other words, with this configuration, it is possible to set the widthwise dimension of the cover so that the fitting portion is properly tightened against the pipe portion when the fitting portion is fitted into the concave portion (when attached to the pipe portion), while utilizing the elastic deformation of the elastic deformation portion to fit the fitting portion into the concave portion.

[0015] A fifth characteristic configuration of the present invention is configured such that, in a state where the cover is attached to an outer surface of a pipe portion, one end portion of the cover width direction including the fitting-side extending member is disposed on the outer side of the cover in the inward / outward direction, and the other end portion of the cover width direction including the fitted-side extending member is disposed on the inner side of the cover in the inward / outward direction, a flexible deformation allowing portion that allows flexible deformation in an inner and outer direction of the cover is provided at one end portion of the cover width direction and closer to the center of the cover width direction than the fitting-side extension member; In the mounting position in which it is wrapped in a ring shape around the outer surface of the tube portion, the flexible deformation-allowing portion flexibly deforms to fold back one end portion in the cover width direction toward the inward side in the cover outward direction and toward the center in the cover width direction, and the fitting portion of the fitting side extending member provided on the edge portion of that one end portion can be freely fitted into the fitted portion of the fitted side extending member provided at the other end portion in the cover width direction.

[0016] According to this configuration, when the fitting portion is fitted to the outer surface of the tube portion, the portion on one end side in the cover width direction is folded back as described above, and the fitting portion is fitted into the fitted portion, so that the portion on the outer side of the fitting portion in the inside-outside direction of the cover is provided with a central portion in the cover width direction and a deformation-allowing portion in relation to the folded back portion. Therefore, the fitting position between the fitting portion and the fitted portion can be covered from the outer side in the inside-outside direction of the cover by the central portion in the cover width direction and the deformation-allowing portion in relation to the folded back portion, which can further prevent sound leakage from the joint portion and can prevent the fitting-side extending member from being exposed to the outside, improving the appearance in the fitted state.

[0017] The sixth characteristic configuration of the present invention is as follows: The fitting side extending member and the fitted side extending member are provided continuously over substantially the entire area in the extending direction along the edge portion in the width direction of the cover, In the case of straight specifications where the outer surface of the straight part of the pipe is the target for installation, The fitting side extending member is divided in the extending direction at a length shorter than the fitted side extending member.

[0018] According to this configuration, the fitting side extending member and the fitted side extending member are provided continuously over almost the entire extension direction along the edge portion in the width direction of the cover, thereby preventing gaps from forming in the joint portion and suppressing the joint portion from coming loose. Furthermore, the fitting side extending member, which is the side that is operated by the worker to perform the fitting operation, is divided in the extension direction along the edge portion in the width direction of the cover at a length shorter than the fitting-side extending member, thereby suppressing the deterioration or difficulty of the fitting workability caused by the fitting side extending member being long, and it can be attached to the outer surface of the straight portion of the tube section with good workability.

[0019] A seventh characteristic configuration of the present invention is that the fitting side extending member and the fitted side extending member are provided continuously over substantially the entire area in the extension direction along the edge portion in the width direction of the cover, In the case of bending specifications where the outer surface of the bent part of the pipe is the target for installation, The fitting side extending member and the fitted side extending member are divided at a portion corresponding to a bent portion of the pipe portion in the extending direction.

[0020] According to this configuration, the fitting side extending member and the fitted side extending member are provided continuously over almost the entire extension direction along the edge portion in the width direction of the cover, thereby preventing gaps from forming in the joint portion and suppressing the joint portion from coming loose. Furthermore, since the fitting side extending member and the fitted side extending member are divided at a position corresponding to the bending point of the pipe portion in the extending direction along the edge portion of the cover width direction, even if the fitting side extending member and the fitted side extending member are configured as simple straight lines extending along the extending direction, they can be attached to the outer surface of the bending portion of the pipe portion in a good mounting posture that follows the outer surface of the bending portion of the pipe portion.

[0021] An eighth characteristic configuration of the present invention is a sound insulation structure in which a flexible sound insulation cover is attached to an outer surface of a pipe section arranged in a building in a ring-shaped wrapping manner, The sound-insulating cover is provided with a joint portion that can freely connect one end portion and the other end portion in a width direction of the cover that are arranged adjacent to each other in an installation posture in which the sound-insulating cover is wrapped around an outer surface of the pipe portion in a ring shape, the joint portion is composed of a fitting-side extending member having a fitting portion and extending along an edge portion of one end portion in the width direction of the cover, and a fitted-side extending member having a fitted portion and extending along an edge portion of the other end portion in the width direction of the cover, The fitting portion of the fitting side extending member and the fitted portion of the fitted side extending member are configured to be freely fitted into each other in an arrangement in which the fitting side extending member and the fitted side extending member overlap in the inside and outside directions of the cover.

[0022] According to this configuration, in an installation state in which one end portion and the other end portion in the width direction of the cover are connected at the joint portion in an installation position wrapped around the outer surface of the tube portion, the fitting-side extending member and the fitted-side extending member are arranged overlapping in the inside-outside direction of the cover, so that the overlapping arrangement of both extending members can suppress the formation of a large gap at the joint portion and prevent sound leakage from the joint portion. Moreover, at the joint portion, the fitting portion of the fitting-side extending member and the fitted portion of the fitted-side extending member are fitted into each other at a fixed fitting position, so that the one end portion and the other end portion in the width direction of the cover can be reliably connected at a fixed joint position, and the cover can be attached to the outer surface of the tube portion with an appropriate tightening level regardless of the operator. [Brief description of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view showing a sound insulation structure using a straight sound insulation cover (first embodiment); [Diagram 2] (A) Side view of the straight sound insulation cover, (B) Inside view of the straight sound insulation cover [Diagram 3] Diagram showing joint operation of the joint section [Figure 4] FIG. 13 is a perspective view showing a sound insulation structure using a sound insulation cover of a bent type (second embodiment); [Diagram 5] Exploded view showing the bent sound insulation cover [Figure 6] A side view showing another embodiment A of the joint portion. [Figure 7] FIG. 11 is a side view showing another embodiment B of the joint portion. [Figure 8] FIG. 11 is a side view showing another embodiment C of the joint portion. [Figure 9] (A) is a perspective view of another embodiment D of the joint portion before connection, as viewed from the inside in the inside-outside direction of the cover; (B) is a perspective view of another embodiment D of the joint portion in a connected state, as viewed from the inside in the inside-outside direction of the cover; (C) is a perspective view of another embodiment D of the joint portion in a connected state, as viewed from the outside in the inside-outside direction of the cover [Figure 10] FIG. 1A is a perspective view of a joint portion according to another embodiment E in a state before the joint portion is connected, as viewed from the inside in the inside-outside direction of the cover; FIG. 1B is a cross-sectional view of the joint portion according to another embodiment E in a connected state; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] [First embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a sound insulation cover and a sound insulation structure using the sound insulation cover according to the present invention will be described with reference to the drawings. 1 shows a sound insulation structure in which a sound insulation cover 1 is attached to the outer surface of a pipe section K (a vertical drainage pipe in the illustrated example) installed in a building such as an apartment building. This sound insulation structure prevents sound generated from the pipe section K from leaking out to the outside by tightly covering the outer surface of the pipe section K with the sound insulation cover 1. Note that this sound insulation structure can be used to insulate not only vertical drainage pipes, but also various types of pipe sections K that may generate sound, such as horizontal drainage pipes, collecting drainage pipes, water supply pipes, refrigerant pipes, and hot and cold water pipes.

[0025] 1 and 2, the sound insulation cover 1 of the first embodiment is configured as a straight specification to be attached to the outer surface of a straight portion of a pipe section K, and is configured as a rectangular sheet (see FIG. 2(B)). The sound insulation cover 1 is provided with a joint part J that can freely connect one end part 1A (the left end part in FIG. 2) and the other end part 1B (the right end part in FIG. 2) in the cover width direction X, and as shown in FIG. 1, in an attachment position where the sound insulation cover 1 is wrapped in a ring shape around the outer surface of the pipe section K, the one end part 1A and the other end part 1B in the cover width direction X, which are arranged adjacent to each other, are connected by the joint part J to be attached to the pipe section K.

[0026] As shown in Fig. 2, substantially the entire area of ​​the sound insulation cover 1 in the cover width direction X is composed of a multi-layered flexible sound insulation sheet 2. As shown in Fig. 2(A), this sound insulation sheet 2 has a sound insulation layer 21 arranged on the outer side (Z1 side) of the cover inner / outer direction Z (cover thickness direction) and a sound absorbing layer 22 arranged on the inner side (Z2 side) of the cover inner / outer direction Z, and the sound absorbing effect of the sound absorbing layer 22 and the sound insulating effect of the sound insulating layer 21 suitably prevent the sound of the fluid flowing through the pipe part K and the sound generated by the vibration of the pipe part K from leaking out to the outside. The sound insulation layer 21 is composed of a sound insulation material such as a polyvinyl chloride sheet. The sound absorbing layer 22 is composed of a sound absorbing material such as a flame-retardant mixed cotton felt, and in addition to sound absorption, has elasticity that allows it to elastically deform in the thickness direction.

[0027] As shown in Figures 2 and 3, the joint portion J is composed of an fitting-side extending member 3 made of hard resin having a fitting portion 31 and extending along the edge portion of one end portion 1A of the sound-insulating cover 1 in the cover width direction X, and an fitted-side extending member 4 made of hard resin having a fitted portion 41 and extending along the edge portion of the other end portion 1B of the sound-insulating cover 1 in the cover width direction X.

[0028] 2 and 3 show the cover width direction X, the center side X2 in the cover width direction, and the end side X1 in the cover width direction, but the center side X2 and the end side X1 are opposite in one end side region 1A and the other end side region 1B in the cover width direction X of the sound-insulating cover 1. Therefore, in the one end side region 1A in the cover width direction X, they are called the center side X2A and the end side X1A, and in the other end side region 1B in the cover width direction X, they are called the center side X2B and the end side X1B.

[0029] As shown in Fig. 2(B) , the sound insulation cover 1 is formed in a rectangular shape, so that at one end portion 1A of the sound insulation cover 1 in the cover width direction X, its edge portion is linear and extends in the cover length direction Y. The cover length direction Y is a direction perpendicular to the cover width direction X. Thus, as shown in the left end portion of Fig. 2(B) , the fitting-side extending member 3 is provided in a state of extending along the cover length direction Y at the edge portion of the one end portion 1A. Similarly to the fitting-side extending member 3, the fitting-side extending member 4 is provided in a state of extending along the cover length direction Y at the edge portion of the other end portion 1B as shown in the right end portion of Fig. 2(B) .

[0030] 3(B), the fitting portion 31 and the fitted portion 41 are configured to be freely fitted into each other in an arrangement state in which the fitting-side extending member 3 and the fitted-side extending member 4 overlap in the cover inner / outer direction Z (radial direction of the pipe portion K). In this embodiment, the fitting-side extending member 3 is arranged on the outer side (Z1 side) of the cover inner / outer direction Z, and the fitted-side extending member 4 is arranged on the inner side (Z2 side) of the cover inner / outer direction Z, and the fitting-side extending member 3 on the outer side and the fitted-side extending member 4 on the inner side are fitted and engaged with each other in a state in which they have an overlapping portion of a predetermined width.

[0031] 2(B), the fitting-side extending member 3 and the fitted-side extending member 4 are provided over substantially the entire area in the cover length direction Y (corresponding to the extending direction) along the edge portion of the cover width direction X of the sound-insulating cover 1. Furthermore, in this embodiment, the fitting portion 31 extends over the entire area of ​​the fitting-side extending member 3, and the fitted portion 41 also extends over the entire area of ​​the fitted-side extending member 4. 1, when attached to the outer surface of the tube part K, the fitting-side extending member 3 and the fitted-side extending member 4 are overlapped over substantially the entire area in the cover width direction X, and substantially the entire area in the cover length direction Y is a fitting area of ​​the fitting portion 31 of the fitting-side extending member 3 and the fitted portion 41 of the fitted-side extending member 4. This makes it possible to effectively prevent sound leakage from the joint part J, and also effectively prevent the joint part J from coming off.

[0032] As shown in FIG. 2B, the fitting-side extending member 3 is divided in the cover length direction Y at a length shorter than the fitting-side extending member 4. Specifically, the fitting-side extending member 4 is composed of a single member having a length covering substantially the entire area of ​​the sound-insulating cover 1 in the cover length direction Y, whereas the fitting-side extending member 3 is divided into a plurality of (four in the illustrated example) divided members 3A at a predetermined length. Therefore, the fitting-side extending member 3 can be fitted by an operator for each divided member 3A, so that the fitting-side extending member 3 is prevented from becoming a long and difficult member to handle, which reduces or makes the fitting workability difficult, and the workability can be improved. The gap between adjacent divided members 3A in the cover length direction Y is set to a set length (for example, 5 mm) or less that is set in consideration of sound insulation.

[0033] As shown on the right side of Fig. 2(A), the fitted-side extending member 4 is configured as a member having a hook shape (J-shaped in side view in the illustrated example) in which an attachment plate portion 42 and a folded-back plate portion 43 are integrally connected. The attachment plate portion 42 is attached to the inner surface of the edge portion 2b on the other end side of the cover width direction X of the sound insulation sheet 2 by an attachment means, and is formed in a shape extending to the outer side (X1B side) of the cover width direction X. As shown on the right side of Fig. 2(A) and Fig. 3(A), the folded-back plate portion 43 is formed in a hook shape (U-shaped in side view in the illustrated example) in side view that extends from the attachment plate portion 42 to the outer side (X1B side) of the cover width direction X and then folded back to the outer side (Z1 side) of the cover inside-outside direction Z and the center side (X2B side) of the cover width direction X. The fitted portion 41 provided on the fitted side extending member 4 is configured by a recessed portion 43a formed inside the folded plate portion 43 and opening toward the center side in the cover width direction X (X2B side).

[0034] As shown in Fig. 3(A), the folded plate portion 43 is composed of an inner plate portion 43A extending from the mounting plate portion 42 toward the outer side (X1B side) in the cover width direction X, a connecting plate portion 43B extending from the inner plate portion 43A toward the outer side (Z1 side) in the cover inside-outside direction Z, and an outer plate portion 43D extending from the tip of the connecting plate portion 43B toward the center side (X2B side) in the cover width direction X. The part of the folded plate portion 43 surrounded by the inner plate portion 43A, the connecting plate portion 43B, and the outer plate portion 43D is a recessed portion 43a that opens toward the center side (X2B side) in the cover width direction X. At the tip of the outer plate portion 43D that is the opening edge of the recessed portion 43a, a fitted-side slip-out prevention claw 43b is formed to protrude and has a substantially right-angled triangular shape in a side view, the thickness of which decreases toward the tip side.

[0035] As shown on the left side of Fig. 2(A), the fitting-side extending member 3 is configured as a member having a generally flat plate shape in side view, in which an attachment plate portion 32 and a fitting portion 31 are integrally connected. An end portion of the attachment plate portion 32 is attached by attachment means to an outer surface portion of an end edge portion 2a on one end side in the cover width direction X of the sound insulation sheet 2 via a flexible deformation allowance portion 5. Also, as shown in Fig. 3(A), a fitting-side slip-out prevention claw 31a having a right-angled triangular cross section and tapering toward the tip side is formed protruding from the tip portion of the plate-shaped fitting portion 31. The plate-like fitting portion 31 advances into the recessed portion 43a while elastically pushing the recessed portion 43a wider by the fitting operation by the operator, and the recessed portion 43a elastically recovers to its contracted side after the advancement, so that the fitting portion 31 can be fitted into the recessed portion 43a in a retained state in which the fitting-side retaining claws 31a of the fitting portion 31 and the fitted-side retaining claws 43b of the opening edge of the recessed portion 43a are engaged with each other as shown in Fig. 3(B). The flexible deformation allowing portion 5 is made of, for example, a fabric or a resin sheet having flexibility that allows it to be freely flexibly deformed in the inside and outside directions of the cover.

[0036] In this embodiment, in an installation position in which the sound-insulating cover 1 is wrapped around the outer surface of the tube portion K, the fitting portion 31 of the fitting-side extending member 3 is configured so that the edge portion of one end portion 1A in the cover width direction X is folded back to the inner side (Z2 side) in the cover inner / outer direction Z and to the central side (X2 side) in the cover width direction X due to the flexible deformation of the flexible deformation-allowing portion 5, as shown by the arrow in Figure 3(A), and then the edge portion of the other end portion 1B in the cover width direction X can be freely fitted into the concave portion 43a from the central side X2 in the cover width direction X, as shown in Figure 3(B).

[0037] To further explain the operation when fitting the fitting portion 31 into the recessed portion 43a (fitted portion 41), in the mounting position (see FIG. 1) in which the sound insulation cover 1 is wrapped around the outer surface of the pipe K in a ring shape, as shown by the outline arrow in FIG. 3A, the flexible deformation allowance portion 5 is flexiblely deformed to fold back the one end portion 1A in the cover width direction X toward the inner side (Z2 side) in the cover inner / outer direction Z (radial direction of the pipe K) and toward the center side (X2A side) in the cover width direction X. Then, the one end portion 1A in the cover width direction X is moved to the cover reduced diameter side (left side in the figure) beyond the fitting position (position in FIG. 3B) between the fitting portion 31 of the one end portion 1A and the recessed portion 43a of the other end portion 1B in the cover width direction X. At this time, the sound absorbing layer 22 of the sound insulation sheet 2 functions as an elastic deformation portion 6, elastically deforming in the contracting direction in the inside-outside direction Z of the cover, and the flexible deformation allowing portion 5 also functions as an elastic deformation portion 6, elastically deforming in the expanding direction along the cover width direction X, thereby allowing the fitting portion 31 to be moved beyond the fitting position (position in Figure 3(B)) between the fitting portion 31 and the concave portion 43a toward the cover narrowing side (left side in the figure), and the fitting portion 31 can be positioned on the cover narrowing side beyond that fitting position.

[0038] 3(B), one end portion 1A of the sound insulation cover 1 in the cover width direction X is moved to the return side (right side in the figure) opposite to the above operation by utilizing the elastic restoration of the elastic deformation portion 6, and the fitting portion 31 of one end portion 1A in the cover width direction X is fitted into the recessed portion 43a in the other end portion 1B in the cover width direction X from the center side (X2B side) in the cover width direction X. At this time, by moving the fitting portion 31 of the folded back one end portion 1A to the side approaching (contacting) the outer surface of the pipe portion K, the fitting portion 31 enters the recessed portion 43a while elastically pushing the recessed portion 43a wider. After the insertion, the concave portion 43a elastically recovers to the contracted side, whereby the fitting side anti-slip claw 31a of the fitting portion 31 and the fitted side anti-slip claw 43b of the concave portion 43a are engaged with each other to prevent slipping out, thereby allowing the fitting portion 31 to be properly fitted into the concave portion 43a.

[0039] When the fitting portion 31 is fitted into the recessed portion 43a in this manner, the elastic restoration of the elastic deformation portion 6 causes the fitting portion 31 to move toward the cover enlargement side and to assume the fitting position (the position in Figure 3(B)). As a result, the sound absorbing layer 22 of the sound insulating cover 1 does not enter a compressed state, and the sound absorbing layer 22 exerts its inherent sound absorbing function, and the sound insulating cover 1 is attached to the outer surface of the pipe portion K with the appropriate tightness to obtain the desired sound insulating performance of the sound insulating cover 1. Furthermore, in this attached state, as shown in Figure 3 (B), in addition to the fitting side extending member 3 and the fitted side extending member 4 being in an overlapping state, one end side portion 1A of the sound-proofing cover 1 in the cover width direction X is folded back to form a double layer, which further prevents sound leakage from the joint portion J and prevents the fitting side extending member 3 from being exposed to the outside, improving the appearance when attached.

[0040] In the above explanation, an example has been given of the case where one end portion 1A in the cover width direction X is folded back to the inner side (Z2 side) in the cover inner / outer direction Z and to the center side (X2A side) in the cover width direction X, and then the fitting portion 31 is moved to the cover narrowing side beyond the fitting position. However, for example, it is also possible to move the fitting portion 31 to the cover narrowing side beyond the fitting position, and then fold back one end portion 1A in the cover width direction X to the inner side (Z2 side) in the cover inner / outer direction Z and to the center side (X2A side) in the cover width direction X.

[0041] In this way, the action of fitting the fitting portion 31 into the recessed portion 43a (fitted portion 41) only needs to involve both the action of folding back one end side portion 1A in the cover width direction X to the inner side (Z2 side) in the cover inside-outside direction Z and to the center side (X2A side) in the cover width direction X, and the action of moving the fitting portion 31 to the cover narrowing side beyond the fitting position, and the order in which these actions are performed can be changed as appropriate depending on various conditions such as the situation at the construction site and the ease of work for the worker.

[0042] Here, since the fitting position (position in FIG. 3(B)) between the fitting portion 31 and the recessed portion 43a (fitted portion 41) is fixed, the width dimension in the cover width direction X of the sound insulation sheet 2 can be easily adjusted to an appropriate width dimension corresponding to the outer surface of the pipe portion K. This adjustment makes it possible to effectively prevent sound leakage from the joint portion J by the overlapping state of the fitting side extending member 3 and the fitted side extending member 4 while appropriately exhibiting the sound insulating function and sound absorbing function of the sound insulating layer 21 and the sound absorbing layer 22 of the sound insulation sheet 2, thereby providing an effective sound insulation cover 1.

[0043] Second Embodiment Fig. 4 shows a state in which the sound-insulating cover 1 of the second embodiment is attached to the outer surface of the bent portion of the pipe section K, and Fig. 5 shows a state in which the sound-insulating cover 1 of the second embodiment is unfolded. The sound-insulating cover 1 of the second embodiment is configured as a bent cover intended to be attached to the outer surface of the bent portion of the pipe section K. In the second embodiment, configurations different from the first embodiment will be described, and detailed descriptions of configurations similar to those of the first embodiment will be omitted by using the same reference numerals, etc.

[0044] As shown in Fig. 5, the sound insulating cover 1 has substantially V-shaped cutouts 1D and 1E formed at the center in the cover length direction Y at one end portion 1A (the right end portion in Fig. 5) and the other end portion 1B (the left end portion in Fig. 5) in the cover width direction X. The opposing sides 1d and 1e of the substantially V-shaped cutouts 1D and 1E are fixed to each other by a fixing means such as sewing, so that the sound insulating cover 1 is molded into a three-dimensional shape that can be attached to the outer surface of the bent portion of the pipe K while being aligned with the outer surface of the bent portion as shown in Fig. 4. The shapes of the cutouts 1D and 1E can be changed as appropriate depending on the bending angle and bending shape of the bent portion of the pipe K, and are not limited to the shapes shown in Fig. 5.

[0045] As shown in Figure 5, the fitting side extending member 3 and the fitted side extending member 4 are divided into multiple (two in the illustrated example) divided members 3A, 4A at a position corresponding to the bending point R of the pipe section K in the extending direction (cover length direction Y) of the edge portions of one end side portion 1A and the other end side portion 1B of the sound-insulating cover 1. Therefore, while the fitting side extending member 3 and the fitted side extending member 4 are configured in a simple straight line extending along the above-mentioned extension direction (cover length direction Y), they can be attached to the outer surface of the curved portion of the tube section K in an excellent mounting posture that follows the outer surface of the curved portion of the tube section K. In addition, Figure 4 shows the state in which the fitting portion 31 (not shown) of the lower fitting side extending member 3 (split member 3A) is fitted into the fitted portion 41 (not shown) of the fitted side extending member 4 (split member 4A), and before the fitting portion 31 of the upper fitting side extending member 3 (split member 3A) is fitted into the fitted portion 41 of the fitted side extending member 4 (split member 4A).

[0046] [Another embodiment] Other embodiments of the present invention will be described below. Note that the configurations of the embodiments described below are not limited to being applied alone, but may also be applied in combination with the configurations of other embodiments.

[0047] (1) The joint portion J (the fitting side extending member 3 and the fitted side extending member 4) is not limited to the configuration shown in each of the above-described embodiments, and various configuration changes are possible, for example, as shown in the following alternative embodiments A to E. Below, alternative embodiments A to E of the joint portion J will be described, but since the configuration other than the joint portion J is the same as the first embodiment, the configuration of the joint portion J will be mainly described using Figures 6 to 10 which show only the joint portion J.

[0048] (Another embodiment A of the joint part) As shown in Figure 6, in another embodiment A of this joint part J, the fitting portion 31 of the fitting side extending member 3 and the fitted portion 41 of the fitted side extending member 4 are configured to be freely fitted into each other by moving toward each other in the cover inward / outward direction Z.

[0049] Specifically, the fitted portion 41 is composed of a convex portion 44 protruding from the plate-shaped fitted side extending member 4 toward the outer side (Z1 side) in the cover inward / outward direction Z, and the tip of the convex portion 44 is provided with an enlarged portion 44a having an enlarged cross-sectional shape to prevent the part from coming loose. The fitting portion 31 is configured with a recessed portion 33a that opens toward the inner side (Z2 side) in the cover inside-outside direction Z in the plate-shaped fitting-side extension member 3. The recessed portion 33a is configured by forming a curved plate portion 33 that is approximately C-shaped in side view in the plate-shaped fitting-side extension member 3. The inner shape of the recessed portion 33a is configured to correspond to the outer shape of the protruding portion 44. The concave portion 33a (fitting portion 31) is elastically pushed open as it moves relatively closer to the convex portion 44 (fitted portion 41) in the cover inside-outside direction Z, allowing the convex portion 44 to enter inside, and after entering, it elastically restores to its contracted side, thereby being fitted into the convex portion 44 in a non-slip state.

[0050] (Another embodiment B of the joint part) As shown in FIG. 7, another embodiment B of the joint portion J also has the following features: The fitting portion 31 of the fitting side extending member 3 and the fitted portion 41 of the fitted side extending member 4 are configured to be freely fitted into each other by moving toward each other in the cover inward / outward direction Z.

[0051] The fitted portion 41 is composed of a fitted-side inclined plate portion 45 that extends obliquely toward the outer side (Z1) in the cover inside-outside direction Z and toward the center side (left side in the figure) in the cover width direction X at an outer side portion in the cover width direction X of the plate-shaped fitted-side extending member 4. At the tip of this fitted-side inclined plate portion 45, an enlarged portion 45a is formed whose cross-sectional shape is enlarged and which protrudes toward the outer side in the cover width direction X to prevent it from coming off.

[0052] The fitting portion 31 is configured with a recessed portion 34a that opens toward the inner side (Z2 side) in the cover inward / outward direction Z in the outer side portion of the cover width direction X of the plate-shaped fitting-side extending member 3. The outer side portion of the cover width direction X of the plate-shaped fitting-side extending member 3 is provided with a fitting-side inclined plate portion 34A that extends obliquely toward the outer side of the cover width direction X and toward the outer side (Z1 side) in the cover inward / outward direction Z, and a curved plate portion 34B that extends from the outer end of the fitting-side inclined plate portion 34A toward the outer side in the cover width direction X and then curves and extends toward the inner side (Z2 side) in the cover inward / outward direction Z. The portion surrounded by the fitting-side inclined plate portion 34A and the curved plate portion 34B is the recessed portion 34a described above. The recessed portion 34a (fitting portion 31) is fitted into the fitted-side inclined plate portion 45 (fitted portion 41) in a state where the fitted-side inclined plate portion 45 is inserted and surrounded by the relative approaching movement between the recessed portion 34a and the fitted-side inclined plate portion 45. For example, in a state where the recessed portion 34a is moved to the right side in the cover width direction X from the fitting position (position shown in FIG. 7) between the recessed portion 34a and the fitted-side inclined plate portion 45, the fitted-side inclined plate portion 45 can be made to enter the inside of the recessed portion 34a by moving the recessed portion 34a to the inner side (Z2 side) in the cover inside-outside direction Z. Therefore, after the fitted-side inclined plate portion 45 is made to enter the inside of the recessed portion 34a, the recessed portion 34a can be fitted into the fitted-side inclined plate portion 45 by moving the recessed portion 34a to the left side in the cover width direction X. In this way, by combining movements in a plurality of directions, the recessed portion 34a (fitting portion 31) and the fitted inclined plate portion 45 (fitted portion 41) become less likely to come out of the fitted state.

[0053] (Another embodiment C of the joint part) As shown in Figure 8, in another embodiment C of this joint part J, the fitting portion 31 of the fitting side extending member 3 and the fitted portion 41 of the fitted side extending member 4 are configured to be freely fitted into each other by moving toward each other in the cover width direction X.

[0054] The fitting portion 31 is configured with an enlarged portion 35 having a substantially circular cross section, the cross section of which is enlarged at the outer side portion in the cover width direction X of the plate-shaped fitting-side extending member 3. The fitted portion 41 is configured with a concave portion 46a that opens toward the outer side in the cover width direction X at the outer side portion in the cover width direction X of the plate-shaped fitting-side extending member 4. The inner shape of the concave portion 46a is configured to a shape corresponding to the outer shape of the enlarged portion 35. The outer side portion in the cover width direction X of the plate-shaped fitting-side extending member 4 is provided with a pair of curved plate portions 46A having a substantially partial arc shape that branches to the inner side (Z2 side) and the outer side (Z1 side) in the cover inner / outer direction Z, and the portion surrounded by the pair of curved plate portions 46A is the above-mentioned concave portion 46a. The pair of curved plate portions 46A are provided at their tips with movable guide plate portions 46B which are in a flared position and guide the fitting portion 31 into the recessed portion 46a when the fitting portion 31 moves toward the cover in the width direction X. Then, as the expanding portion 35 (fitting portion 31) moves relatively closer to the concave portion 46a (fitted portion 41) in the cover width direction X, it elastically pushes the concave portion 46a wider and enters into the concave portion 46a, and after entering, the concave portion 46a elastically restores to its contracted side, thereby fitting the expanding portion 35 into the concave portion 46a.

[0055] (Another embodiment D of the joint part) 9, in another embodiment D of the joint part J, a plurality of fitting portions 31 of the fitting-side extending member 3 and a plurality of fitted portions 41 of the fitted-side extending member 4 are provided at predetermined intervals in the cover length direction Y. The fitting portions 31 of the fitting-side extending member 3 and the fitted portions 41 of the fitted-side extending member 4 are configured to be freely fitted into each other by moving toward each other in the cover width direction X. Furthermore, the fitting-side extending member 3 and the fitted-side extending member 4 are configured from metal plates.

[0056] 9(A), the fitting portion 31 is composed of a substantially rectangular first tongue piece 36A cut and raised diagonally on the inner side (Z2 side) of the cover inner / outer direction Z in the plate-shaped fitting-side extension member 3, and a second tongue piece 36B cut and raised diagonally on the outer side (Z1 side) of the cover inner / outer direction Z. The first tongue piece 36A and the second tongue piece 36B are cut and raised diagonally with their outer sides 36a in the cover width direction X as a fulcrum. The first tongue piece 36A and the second tongue piece 36B are alternately arranged at intervals along the cover length direction Y.

[0057] The fitted-side extending member 4 has a bifurcated shape in which an inner plate portion 47A and an outer plate portion 47B are arranged in parallel with each other in the cover inside-outside direction Z with a gap slightly larger than the plate thickness of the plate-shaped fitting-side extending member 3, and are connected at the center in the cover width direction X. The plate-shaped fitting-side extending member 3 can be freely inserted from the outer side in the cover width direction X into the gap between the inner plate portion 47A and the outer plate portion 47B in the fitted-side extending member 4. 9(A) and 9(C), a first opening 47a is formed in the inner plate portion 47A of the fitting-side extending member 3, into which the first tongue piece 36A is fitted when the plate-shaped fitting-side extending member 3 is inserted between the inner plate portion 47A and the outer plate portion 47B. Also, a second opening 47b is formed in the outer plate portion 47B of the fitting-side extending member 3, into which the second tongue piece 36B is fitted when the plate-shaped fitting-side extending member 3 is inserted between the inner plate portion 47A and the outer plate portion 47B, as shown in FIG.

[0058] As the plate-shaped fitting-side extending member 3 is inserted between the inner plate portion 47A and the outer plate portion 47B, the first tongue piece 36A and the second tongue piece 36B (fitting portion 31) are elastically deformed toward the side where the cut-and-raise angle lies (the side where they approach the surface of the plate-shaped fitting-side extending member 3) due to the abutment between the inner plate portion 47A and the outer plate portion 47B. When the first tongue piece 36A and the second tongue piece 36B are inserted to a position facing the first opening 47a of the inner plate portion 47A and the second opening 47b of the outer plate portion 47B, they elastically restore to the side where the cut-and-raise angle occurs, and are fitted into the first opening 47a and the second opening 47b (fitted portion 41).

[0059] (Another embodiment E of the joint part) 10(A), in another embodiment E of the joint part J, a plurality of fitting portions 31 of the fitting-side extending member 3 and a plurality of fitted portions 41 of the fitted-side extending member 4 are provided at predetermined intervals in the cover length direction Y. In addition, the fitting portions 31 of the fitting-side extending member 3 and the fitted portions 41 of the fitted-side extending member 4 are configured to be freely fitted into each other by moving toward each other in the cover inner / outer direction Z.

[0060] 10(A), the fitting portion 31 is configured with a cylindrical convex portion 37 protruding toward the inner side Z2 in the cover inside-outside direction Z on the plate-shaped fitting-side extension member 3. A plurality of convex portions 37 as the fitting portion 31 are provided at predetermined intervals in the cover length direction Y. The tip of the convex portion 37 is provided with an enlarged portion 37a having an enlarged cross-sectional shape compared to the base end side of the convex portion 37 for preventing it from coming off.

[0061] 10(A), the fitted portion 41 is configured with an opening 48 formed through the plate-shaped fitted-side extending member 4 in the cover inner / outer direction Z. The openings 48 as the fitted portion 41 are also provided in plurality at predetermined intervals in the cover length direction Y, the same as the convex portion 37. As shown in Fig. 10(A), a circular enlarged opening portion 48A having a size that allows the passage of the enlarged portion 37a of the convex portion 37 from the cover inside / outside direction Z is formed at the center side of the opening 48 in the cover width direction X. Also, at the outer side of the opening 48 in the cover width direction X, a narrow opening portion 48B that does not allow the passage of the enlarged portion 37a of the convex portion 37 from the cover inside / outside direction Z and allows the base end side of the convex portion 37 to be disposed therein is formed along the cover width direction X. As shown in Fig. 10(B), the convex portion 37 (see the dashed line in the figure) inserted into the enlarged opening portion 48A in a state where it passes through the enlarged portion 37a of the opening 48 can be slid to the narrow opening portion 48B on the outer side of the cover width direction X, so that the convex portion 37 can be fitted into the narrow opening portion 48B in a state where it is prevented from coming out by the enlarged portion 37a.

[0062] When the sound insulation cover 1 is attached to the outer surface of the pipe K, as in the first embodiment, the one end side portion 1A of the sound insulation cover 1 in the folded-back state is moved to the cover reduced diameter side (left side in FIG. 10(B)) by utilizing the elastic deformation of the elastic deformation portion 6 so that the convex portion 37 (fitting portion 31) of the fitting side extending member 3 is positioned on the cover reduced diameter side (left side in FIG. 10(B)) beyond the fitting position (position of the solid line in FIG. 10(B)) with the opening 48 (fitted portion 41) of the fitted side extending member 4 of the other end side portion 1B in the cover width direction X. Then, the one end side portion 1A is moved to the inner side (Z2 side) in the cover inner / outer direction Z, and the convex portion 37 is inserted through the enlarged opening portion 48A of the opening 48 in a state where it passes through the enlarged opening portion 37a (see the dashed line in FIG. 10(B)). Next, the one end portion 1A is moved to the return side (right side in the figure) opposite to the above operation by utilizing the elastic restoration of the elastic deformation portion 6, and the convex portion 37 (see the dotted line in the figure) inserted into the enlarged opening portion 48A while passing through the enlarged portion 37a is slid to the narrow opening portion 48B on the outer side in the cover width direction X, so that the convex portion 37 is fitted into the narrow opening portion 48B while being prevented from coming out by the enlarged portion 37a.

[0063] (2) In each of the above-described embodiments, the elastic deformation portion 6 is composed of the sound absorbing layer 22 of the sound insulation sheet 2 and the flexible deformation portion 5, but it may be composed of only one of them, and in some cases, the elastic deformation portion 6 may not be provided.

[0064] (3) In the above-described first and second embodiments, the fitted-side extending member 4 is configured as a member having a generally J-shape in side view and has a folded-back plate portion 43, and the fitting-side extending member 3 is configured as a member having a generally flat plate-like shape in side view. However, the fitting-side extending member 3 may also be configured as a member having a generally J-shape in side view and has a folded-back plate portion. In this case, the tip end portion of the folded-back portion of the fitting-side extending member 3 constitutes the fitting portion 31, and the tip end portion of the folded-back portion (fitting portion 31) is fitted into a concave portion (fitted portion 41) inside the folded-back plate portion 43 of the fitted-side extending member 4. [Explanation of symbols]

[0065] 1 Soundproof cover 1A One end side part 1B Other end side part 3. Fitting side extension member 4 Extension member on the fitted side 5. Deflection-permitting section 6 Elastic deformation part 31 Fitting 41 Fitted part 43a Concave part J Joint K tube section R Bend point X Cover width direction Y Cover length direction Z Cover inside / outside direction

Claims

1. A flexible sound-insulating cover that is attached to an outer surface of a pipe section arranged in a building in a ring-shaped manner, The cover is provided with a joint portion that can freely connect one end portion and the other end portion in the width direction of the cover that are arranged adjacent to each other in a mounting position in which the cover is wrapped around the outer surface of the pipe portion in a ring shape, the joint portion is composed of a fitting-side extending member having a fitting portion and extending along an edge portion of one end portion in the width direction of the cover, and a fitted-side extending member having a fitted portion and extending along an edge portion of the other end portion in the width direction of the cover, The sound-proofing cover is configured so that the fitting portion of the fitting side extending member and the fitted portion of the fitted side extending member can be freely fitted together in an arrangement in which the fitting side extending member and the fitted side extending member overlap in the inside and outside directions of the cover.

2. 2. The sound insulating cover according to claim 1, wherein the fitting portion of the fitting-side extending member and the fitted portion of the fitted-side extending member extend continuously along edge portions in a width direction of the cover.

3. the fitted portion of the fitted-side extending member is configured as a concave portion that opens toward the center in the cover width direction at an edge portion of the other end side portion in the cover width direction, The sound-proof cover of claim 1, wherein the fitting portion of the fitting side extension member is configured to be freely fitted into the concave portion from the center side of the cover width direction at the other end side portion in the cover width direction in an installation position in which it is wrapped in a ring shape around the outer surface of the tube portion.

4. 4. The sound-proof cover according to claim 3, further comprising an elastic deformation portion that allows elastic deformation of the cover toward the reduced diameter side beyond the fitting position between the fitting portion of the fitting side extending member at one end side of the cover width direction and the concave portion of the fitted side extending member at the other end side of the cover width direction when in an installation position in which the cover is wrapped in a ring shape around the outer surface of the tube portion.

5. When the cover is attached to the outer surface of the pipe, one end portion of the cover width direction including the fitting-side extending member is disposed on the outer side of the cover in the inward / outward direction, and the other end portion of the cover width direction including the fitted-side extending member is disposed on the inner side of the cover in the inward / outward direction, a flexible deformation allowing portion that allows flexible deformation in an inner and outer direction of the cover is provided at one end portion of the cover width direction and closer to the center of the cover width direction than the fitting-side extension member; A sound-proof cover as described in any one of claims 1 to 4, wherein, in an installation position in which the cover is wrapped in a ring shape around the outer surface of the tubular portion, the flexible deformation-allowing portion flexibly deforms to fold back one end portion of the cover width direction toward the inward side in the cover inward / outward direction and toward the center in the cover width direction, and the fitting portion of the fitting-side extending member provided on the edge portion of the one end portion can be freely fitted into the fitted portion of the fitted-side extending member provided at the other end portion in the cover width direction.

6. The fitting side extending member and the fitted side extending member are provided continuously over substantially the entire area in the extending direction along the edge portion in the width direction of the cover, In the case of straight specifications where the outer surface of the straight part of the pipe is the target for installation, 5. The sound-insulating cover according to claim 1, wherein the fitting-side extending member is divided in the extending direction at a length shorter than that of the fitted-side extending member.

7. The fitting side extending member and the fitted side extending member are provided continuously over substantially the entire area in the extending direction along the edge portion in the width direction of the cover, In the case of bending specifications where the outer surface of the bent part of the pipe is the target for installation, 5. The soundproof cover according to claim 1, wherein the fitting side extending member and the fitted side extending member are divided at a portion corresponding to a bent portion of the pipe portion in the extending direction.

8. A sound insulation structure in which a flexible sound insulation cover is attached to an outer surface of a pipe section arranged in a building in a ring-shaped wrapping manner around the outer surface of the pipe section, The sound-insulating cover is provided with a joint portion that can freely connect one end portion and the other end portion in a width direction of the cover that are arranged adjacent to each other in an installation posture in which the sound-insulating cover is wrapped around an outer surface of the pipe portion in a ring shape, the joint portion is composed of a fitting-side extending member having a fitting portion and extending along an edge portion of one end portion in the width direction of the cover, and a fitted-side extending member having a fitted portion and extending along an edge portion of the other end portion in the width direction of the cover, A sound-proofing structure in which the fitting portion of the fitting-side extending member and the fitted portion of the fitted-side extending member are fitted together in a state in which the fitting-side extending member and the fitted-side extending member overlap in the inside-outside direction of the cover.

Images