JP2019194483A - Attachment fixture - Google Patents

Abstract

To improve the durability of an attachment fixture, and to reduce a cost.SOLUTION: An attachment fixture 100 comprises: a band part 10 constituted of a first band member 20 and a second band member 30 for gripping a halved cylinder tube having a first curved part 21 and a second curved part 31 which are bent along an external periphery of the cylinder tube; a pipe holder 40 for holding piping 3; a first bolt 50 for connecting one-side end parts of the first band member 20 and the second band member 30; and a second bolt 51 penetrating the other end part of the first bolt 50, the other end part of the second band member 30 and the pipe holder 40, and connecting them to one another.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mounting fixture used for a fluid pressure cylinder.

  A fluid pressure cylinder used in a construction machine or the like expands and contracts by supplying and discharging a working fluid into and from a cylinder tube. Piping for supplying and discharging the working fluid to and from the cylinder tube is provided along the axial direction as close to the cylinder as possible. Thereby, the whole fluid pressure cylinder can be made compact and mounting property can be improved.

  In Patent Document 1, two semicircular bands that sandwich a cylinder tube from the outer peripheral side, a bracket that is welded and fixed to one band and has a bolt hole at a position spaced from the band, and bolted to the bolt hole of the bracket And a pipe holder to be provided. The piping of the working fluid is bolted to the bracket by the pipe holder, so that the piping is fixed at a position close to the cylinder tube. The two bands are connected to each other by bolts.

JP 2008-57606 A

  In the fluid pressure cylinder, repeated vibrations occur in the cylinder tube and piping. Therefore, from the viewpoint of durability, the welding structure for fixing the bracket and the band by welding as in the mounting fixture of Patent Document 1 may be abolished. desired.

  On the other hand, if the bracket is fixed to the band with a bolt without using a welded structure, for example, the number of parts increases, resulting in an increase in cost.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to improve the durability of a mounting fixture used for a fluid pressure cylinder and reduce the cost.

  A first invention is an attachment fixture for attaching an object to be attached to the outer periphery of a cylinder tube of a fluid pressure cylinder, and is a cylinder formed in a half shape having curved portions curved along the outer periphery of the cylinder tube. The band part constituted by the first band member and the second band member that clamps the tube from the outer periphery, the holding member for holding the attachment object, and one end parts of the first band member and the second band member are connected to each other. And a second male screw member that passes through and connects the other end of the first band member, the other end of the second band member, and the holding member.

  In 1st invention, a holding member is attached to a band part by screw fastening using the 2nd external thread member which connects the other end parts of a 1st band member and a 2nd band member. For this reason, it is possible to attach the holding member to the band portion without using a welded structure and without increasing the number of parts.

  In the second aspect of the invention, the other end of the first band member has a flat first flat portion, the other end of the second band member has a flat second flat portion, The male screw member is characterized in that the other end portions of the first band member and the second band member are connected to each other through the first plane portion and the second plane portion.

  In the second invention, since the screw can be fastened in a state where the first flat portion of the first band member and the second flat portion of the second band member are overlapped, the rigidity with respect to the fastening force of the second male screw member is improved.

  According to a third aspect of the present invention, the other end of the second band member is a bulging portion that protrudes radially outward of the cylinder tube from the curved portion and divides the inner space with the outer peripheral surface of the cylinder tube. And

  In the third invention, expansion and contraction of the cylinder tube can be absorbed by elastic deformation of the bulging portion.

  According to a fourth aspect of the present invention, there is provided a first female screw portion provided at one end portion of the first band member and screwed into the first male screw member, and a first female screw member provided at the other end portion of the first band member and screwed into the second male screw member. And 2 female screw portions.

  In the fourth invention, since the first female screw portion and the second female screw portion are provided in the same first band member, the second band member may be provided with a hole or the like through which the second male screw member is inserted. Thus, since the first and second female screw portions are provided on one member and the other member only needs to be drilled, the first band member and the second band are compared with the case where the female screw portion is provided on a different member. The manufacturing efficiency of the member is improved.

  According to the present invention, the durability of the mounting fixture is improved and the cost is reduced.

It is a perspective view which shows the attachment fixture which concerns on embodiment of this invention. It is a perspective view which shows the attachment fixture which concerns on embodiment of this invention, and shows from the angle different from FIG. It is a front view which shows the attachment fixture which concerns on embodiment of this invention, and is A arrow line view of FIG.

  Hereinafter, a mounting fixture 100 according to an embodiment of the present invention will be described with reference to the accompanying drawings.

  The attachment fixture 100 attaches fluid pressure piping and electrical wiring as attachment objects to the outer periphery of the cylinder tube 2 of the fluid pressure cylinder 1. Below, the attachment fixture 100 which attaches fluid pressure piping (henceforth only "the piping 3") to the cylinder tube 2 as an attachment target is demonstrated.

  The fluid pressure cylinder 1 is, for example, a hydraulic cylinder that drives an arm, a boom, or the like of a work machine, and expands and contracts according to supply / discharge of a working fluid pressure (working hydraulic pressure) supplied from a fluid pressure source. As the working fluid of the fluid pressure cylinder 1, a water-soluble alternative liquid or the like may be used instead of the working oil.

  As shown in FIG. 1, the fluid pressure cylinder 1 includes a cylinder tube 2, a piston (not shown) that slides in the cylinder tube 2, and a piston rod that is connected to the piston and extends from one end of the cylinder tube 2 ( (Not shown). When the working fluid is supplied to or discharged from at least one of the two pressure chambers (not shown) in the cylinder tube 2 defined by the piston, the piston slides according to the pressure difference between the pressure chambers. As a result, the piston rod and the cylinder tube 2 are relatively moved in the axial direction to drive the drive member of the work machine.

  The fluid pressure cylinder 1 further includes a pipe 3 for supplying and discharging the working fluid to and from the pressure chamber. The piping 3 is provided along the axial direction of the cylinder tube 2 in order to improve the mounting property to the work machine.

  As shown in FIGS. 1 to 3, the mounting fixture 100 is a band portion constituted by two halved first band members 20 and second band members 30 arranged so as to sandwich the cylinder tube 2. 10, a pipe holder 40 as a holding member that is attached to the band unit 10 and holds the pipe 3 together with the band unit 10, and both ends of the first band member 20 and the second band member 30 are connected to each other. The first bolt 50 as the first male screw member and the second bolt 51 as the second male screw member, and the first nut 55 and the second nut as the first female screw portion screwed into the first male screw member and the second male screw member, respectively. And a second nut 56 as an internal thread portion.

  The first band member 20 and the second band member 30 are integrally formed by bending or pressing, respectively.

  As shown in FIG. 3, the first band member 20 is curved from the curved portion along the outer periphery of the cylinder tube 2 (hereinafter referred to as “first curved portion 21”) and from one end of the first curved portion 21. It has the 1st extension part 22 as one end part extended toward the radial direction outer side of the cylinder tube 2, and the planar 1st plane part 24 extended toward the tangential direction from the other end of the 1st bending part 21. .

  The first extending portion 22 is formed such that the base end is connected to one end of the first bending portion 21 and extends from one end of the first bending portion 21 in a direction perpendicular to the tangent (the radial direction of the cylinder tube 2). And a distal end portion 23b that is provided at the distal end of the base portion 23a and is bent toward the second band member 30 in the circumferential direction of the cylinder tube 2.

  A bolt hole 22a through which the first bolt 50 is inserted is formed in the base portion 23a. Further, the first bolt 50 inserted through the bolt hole 22a is screwed to the outer surface of the base portion 23a (the surface opposite to the facing surface facing the second extending portion 32 of the second band member 30 described later). A mating first nut 55 is provided.

  The first flat surface portion 24 is formed with a bolt hole 24a that is a through hole penetrating in the thickness direction and through which the second bolt 51 is inserted. Further, the second bolt 51 inserted through the bolt hole 24a on the inner surface of the first flat surface portion 24 (the surface on the opposite side of the opposite surface facing the second flat surface portion 37 of the second band member 30 described later). A second nut 56 is provided for screwing.

  The second band member 30 is a curved portion that is curved along the outer periphery of the cylinder tube 2 (hereinafter referred to as a “second curved portion 31”), and the radially outer side of the cylinder tube 2 from one end of the second curved portion 31. A second extending portion 32 as one end portion extending toward the end, and a bulging portion 35 as the other end portion bulging from the other end of the second bending portion 31 toward the radially outer side of the cylinder tube 2. And having.

  The second extending portion 32 extends from one end of the second bending portion 31 in a direction perpendicular to the tangent (the radial direction of the cylinder tube 2), and extends to the base portion 23 a of the first extending portion 22 of the first band member 20. It is provided substantially in parallel to. Thereby, the base part 23a of the 1st extension part 22 of the 1st band member 20 and the mutually inner surface of the 2nd extension part 32 of the 2nd band member 30 oppose. Further, the second extending portion 32 is in contact with the bent distal end portion 23b of the first extending portion 22 without a gap.

  The second extending portion 32 is formed with a bolt hole 32a which is a through hole penetrating in the thickness direction and through which the first bolt 50 is inserted. The first bolt 50 passes through the bolt hole 32 a of the second extending portion 32 of the second band member 30 and the bolt hole 22 a of the first extending portion 22 of the first band member 20, and passes through the first extending portion 22. By screwing into the first nut 55 provided, the first band member 20 and the second band member 30 are connected to each other by screw fastening.

  The bulging portion 35 includes a planar projection 36 that projects from the other end of the second bending portion 31 toward the radially outer side of the cylinder tube 2, and a first plane of the first band member 20 from the tip of the projection 36. A planar second planar portion 37 extending along the portion 24. In this way, the bulging portion 35 bulges away from the outer peripheral surface of the cylinder tube 2 radially outward. As a result, a substantially triangular inner space S is defined between the bulging portion 35 and the outer peripheral surface of the cylinder tube 2 as shown in FIG. In the inner space S, a second nut 56 provided in the first flat portion 24 of the first band member 20 is accommodated.

  The second plane portion 37 is located on the outer side (right side in FIG. 3) of the first band member 20 with respect to the cylinder tube 2 and overlaps the first plane portion 24 in the thickness direction. Provided. The second plane portion 37 is formed with a bolt hole 37a that is a through hole penetrating in the thickness direction and through which the second bolt 51 is inserted.

  The pipe holder 40 is provided in the main body 41, a holding portion 42 that extends from the main body 41 and covers a part of the outer peripheral surface of the pipe 3 to hold the pipe 3, and the main body 41. A bolt hole 41a through which the second bolt 51 is inserted.

  The second bolt 51 includes a bolt hole 41 a of the main body 41 of the pipe holder 40, a bolt hole 37 a of the second flat part 37 of the second band member 30, and a bolt hole 24 a of the first flat part 24 of the first band member 20. And is screwed into a second nut 56 provided on the first flat surface portion 24. Thereby, the other ends of the first band member 20 and the second band member 30 are connected by screw fastening, and the pipe holder 40 is connected to the first band member 20 and the second band member 30. Thus, since the first flat surface portion 24 and the second flat surface portion 37 are screw-fastened by the second bolt 51 at the position where the first flat surface portion 24 and the second flat surface portion 37 overlap in the thickness direction, the rigidity of the band portion 10 with respect to the fastening force of the second bolt 51 is increased. Can be secured.

  The dimensions of the first band member 20 and the second band member 30 are the same as those of the first bending portion 21 of the first band member 20 and the second band member 30 when the first band member 20 and the second bolt 51 are screw-fastened. 2 The inner circumference of the bending portion 31 is set in advance so as to be in close contact with the outer circumference of the cylinder tube 2 by elastic force. In assembling the first band member 20 and the second band member 30, the first band member 20, the second band member 30, and the pipe holder 40 are first connected by the second bolt 51, and then the first bolt 50 is used. It is desirable to connect the first band member 20 and the second band member 30. According to this, it is possible to gradually apply an elastic force for tightly attaching the first band member 20 and the second band member 30 to the outer periphery of the cylinder tube 2 by tightening the first bolt 50 and the first nut 55.

  Further, the pipe 3 is sandwiched between the holding portion 42 of the pipe holder 40 and the band portion 10 (more specifically, the second flat surface portion 37 of the second band member 30). The tightening height (tightening depth) of the pipe holder 40 is set to such an extent that the pipe 3 is appropriately pressed against the band part 10.

  The pipe 3 is held by the pipe holder 40 at a position where the first flat surface portion 24 of the first band member 20 and the second flat surface portion 37 of the second band member 30 overlap in the thickness direction (left-right direction in FIG. 3). . The portion where the first flat portion 24 and the second flat portion 37 overlap has higher rigidity than the other portions. Accordingly, when the pipe 3 is held at a position where the first flat surface portion 24 of the first band member 20 and the second flat surface portion 37 of the second band member 30 do not overlap (in other words, the first flat surface portion 24 and the first flat surface portion 24 Compared with the case where only one of the two plane portions 37 holds the pipe 3, it can be held stably. This configuration is not essential, and the pipe 3 may be held by only one of the first plane part 24 and the second plane part 37 and the pipe holder 40.

  Here, conventionally, there is an attachment fixture having a configuration in which a bracket is attached to the outer periphery of the band portion by welding and a pipe holder is attached to the bracket. On the other hand, in a work machine in which the fluid pressure cylinder 1 is mounted, vibration is constantly applied to the cylinder tube 2 and the pipe 3 during operation, and therefore is subject to repeated vibration. Therefore, the conventional mounting fixture having a welded structure requires high quality control in order to ensure the durability of the welded part against vibration. Moreover, since the band part and the bracket are separate parts, the number of parts increases.

  Furthermore, in order to fix the bracket to the outer periphery of the cylinder tube 2 by welding, a welding jig for fixing the bracket to the welding position in advance is required. However, since the band attached to the outer periphery of the cylinder tube 2 has various shapes depending on the type of the fluid pressure cylinder 1, it is necessary to prepare a welding jig for each fluid pressure cylinder 1. Work man-hours and costs increase.

  On the other hand, in the attachment fixture 100, the pipe holder 40 is attached to the band part 10 using the 2nd volt | bolt 51 which connects the other end parts of the 1st band member 20 and the 2nd band member 30. FIG. For this reason, in the attachment fixture 100, the pipe holder 40 can be attached to the band part 10 without using a welding structure and without increasing the number of parts.

  Moreover, since the bracket separately attached to the band part 10 becomes unnecessary, the number of parts can be further reduced. Furthermore, since welding work is not required, a welding jig prepared for each fluid pressure cylinder 1 is also unnecessary, and the number of work steps and costs during manufacturing can be suppressed.

  In addition, the cylinder tube 2 to which high-pressure working fluid is supplied and discharged may be expanded and contracted so that the outer diameter changes according to the supply and discharge of the working fluid.

  On the other hand, the second band member 30 of the mounting fixture 100 has a bulging portion 35 that separates the inner space S from the outer peripheral surface of the cylinder tube 2. For this reason, the bulging part 35 is bent (elastically deformed) so that the angle between the protruding part 36 and the second flat part 37 changes, and can absorb the expansion and contraction of the cylinder tube 2. In addition, the first extending portion 22 of the first band member 20 has a distal end portion 23 b that contacts the second extending portion 32, and the base portion 23 a that is not in contact with the second extending portion 32 and is provided with a gap. . Therefore, when the cylinder tube 2 expands and contracts, the base 23a and the second extending portion 32 of the first extending portion 22 are supported by using the contact portion between the distal end portion 23b of the first extending portion 22 and the second extending portion 32 as a fulcrum. The first bending portion 21 and the second bending portion 31 are also elastically deformed so that the gap between them is expanded and contracted. Thereby, expansion / contraction of the cylinder tube 2 can be absorbed. Therefore, stress concentration in which excessive stress acts on the bent portions of the first band member 20 and the second band member 30 can be prevented.

  In the mounting fixture 100, the first nut 55 and the second nut 56 are provided at both ends of the first band member 20. For this reason, the second band member 30 only needs to be formed with bolt holes 32a and 37a which are through holes. In this way, by providing both the first nut 55 and the second nut 56 in one member (the first band member 20), the second band member 30 only needs to be drilled, and the members are different from each other. Compared with the case where it provides, manufacturing efficiency improves and cost can be reduced. In addition, you may provide the 1st nut 55 and the 2nd nut 56 in a different member.

  Next, a modification of this embodiment will be described.

  In the above embodiment, the pipe holder 40 is directly attached to the band part 10 by the second bolt 51. On the other hand, the pipe holder 40 may be attached to the band unit 10 via a connecting member such as a plate. In this case, the connecting member for attaching the pipe 3 and the pipe holder 40 to the band portion 10 corresponds to the holding member.

  In the above embodiment, the base portion 23 a of the first extension portion 22 is provided with a gap from the second extension portion 32, and the distal end portion 23 b is in contact with the second extension portion 32. Thereby, the elastic force which absorbs expansion / contraction of the cylinder tube 2 is exhibited effectively. On the other hand, the front end portion 23b of the first extension portion 22 may be provided with a gap without contacting the second extension portion 32.

  Moreover, in the said embodiment, the 1st internal thread part and the 2nd internal thread part are the 1st nut 55 and the 2nd nut 56, respectively. On the other hand, the first female screw portion and the second female screw portion may be screw holes in which a female screw is formed on the inner peripheral surface of the bolt hole. Even in this case, in order to improve manufacturing efficiency, it is desirable to form the first female screw portion and the second female screw portion on the same member (in the above embodiment, the first band member 20).

  Further, the bulging portion 35 has a shape that divides a substantially triangular internal space when viewed in the axial direction. On the other hand, the bulging portion 35 can have an arbitrary shape as long as the inner space is partitioned and the accommodation space for the second nut 56 can be secured.

  In the present embodiment, the second bolt hole 37 a is formed in the second flat surface portion 37 of the bulging portion 35, and the pipe holder 40 is attached to the bulging portion 35. On the other hand, the pipe holder 40 may not be attached to the bulging portion 35. For example, a bending portion may be further formed from the tip of the second flat portion 37 of the bulging portion 35, and a pipe holder (second bolt hole 37a) may be provided at the end of the bending portion.

  Moreover, the bulging part 35 is not an essential structure, and the bulging part 35 may not be provided. For example, when the second female screw portion is a screw hole in which a female screw is formed in the bolt hole, or the second nut 56 is banded like the first nut 55 provided in the first extending portion 22 of the first band member 20. When it is configured so as to be disposed outside the portion 10 instead of inside, the bulging portion 35 may not be provided.

  Moreover, although the case where the single piping 3 was attached was demonstrated to the example in the said embodiment, you may attach not only this but the 2 or more piping 3 to the cylinder tube 2 with the attachment fixture 100. FIG.

  According to the above embodiment, there exist the effects shown below.

  In the mounting fixture 100, the pipe holder 40 is attached to the band portion 10 using the second bolt 51 that connects the other end portions of the first band member 20 and the second band member 30. For this reason, in the attachment fixture 100, the pipe holder 40 can be attached to the band part 10 without using a welding structure and increasing the number of parts. Therefore, the mounting fixture 100 can reduce manufacturing costs while ensuring durability.

  In addition, in the mounting fixture 100, the planar first planar portion 24 of the first band member 20 and the planar second planar portion 37 of the second band member 30 are overlapped in the thickness direction, and the first planar surface. The second bolt 51 is inserted into the part 24 and the second flat part 37 and fastened. Thereby, the thickness of the part to which the 2nd volt | bolt 51 is fastened can be enlarged, and the rigidity with respect to the fastening force of the 2nd volt | bolt 51 can be ensured.

  In addition, the second band member 30 of the mounting fixture 100 has a bulging portion 35 that separates the inner space S from the outer peripheral surface of the cylinder tube 2. For this reason, the expansion / contraction of the cylinder tube 2 can be absorbed by the bulging part 35 elastically deforming. Thereby, it is possible to prevent excessive stress from acting on the bent portions of the first band member 20 and the second band member 30.

  In the mounting fixture 100, the first nut 55 and the second nut 56 are provided at both ends of the first band member 20. For this reason, the second band member 30 only needs to be formed with a bolt hole which is a through hole. Thus, as compared with the case where the first nut 55 and the second nut 56 are provided in different members in one member (first band member 20), the manufacturing efficiency is improved and the cost can be reduced.

  The embodiment of the present invention has been described above. However, the above embodiment is merely one example of application of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  Hereinafter, the configuration, operation, and effect of the embodiment of the present invention will be described together.

  An attachment fixture 100 for attaching the pipe 3 to the outer periphery of the cylinder tube 2 of the fluid pressure cylinder 1 has a first split portion 21 and a second bent portion 31 that are curved along the outer periphery of the cylinder tube 2. Formed by the first band member 20 and the second band member 30 sandwiching the cylinder tube 2 from the outer periphery, the pipe holder 40 for holding the pipe 3, the first band member 20 and the first band member 20. A first bolt 50 that connects one end portions of the two-band member 30, a second end portion of the first bolt 50, the other end portion of the second band member 30, and a pipe holder 40 are inserted and connected to each other. And a bolt 51.

  In this configuration, the pipe holder 40 is attached to the band portion 10 by screw fastening using the second bolt 51 that connects the other end portions of the first band member 20 and the second band member 30 to each other. For this reason, the pipe holder 40 can be attached to the band portion 10 without using a welded structure and without increasing the number of parts. Therefore, the durability of the mounting fixture 100 can be improved and the cost can be reduced.

  Further, in the mounting fixture 100, the other end of the first band member 20 has a planar first planar part 24, and the other end of the second band member 30 is a planar second planar part 37. The second bolt 51 is inserted through the first plane part 24 and the second plane part 37 and connects the other end parts of the first band member 20 and the second band member 30 to each other.

  In this configuration, since the screws can be fastened in a state where the first flat portion 24 of the first band member 20 and the second flat portion 37 of the second band member 30 are overlapped, the rigidity with respect to the fastening force of the second bolt 51 is improved.

  Further, in the mounting fixture 100, the other end portion of the second band member 30 protrudes outward in the radial direction of the cylinder tube 2 from the second bending portion 31, and defines an inner space S between the outer peripheral surface of the cylinder tube 2. It is the bulging part 35 which does.

  In this configuration, the expansion and contraction of the cylinder tube 2 can be absorbed by the elastic deformation of the bulging portion 35.

  The mounting fixture 100 includes a first nut 55 provided at one end of the first band member 20 and a first bolt 50 screwed therein, and a second bolt 51 provided at the other end of the first band member 20. A second nut 56 to be screwed is further provided.

  In this configuration, since the first nut member 55 and the second nut member 56 are provided in the same first band member 20, the second band member 30 may be provided with a hole or the like through which the second bolt 51 is inserted. Thus, since the first and second nuts 56 are provided on one member and the other member only needs to be drilled, the first band member 20 and the first band member 20 can be compared with the case where the nut member is provided on a different member. The manufacturing efficiency of the two-band member 30 is improved.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  DESCRIPTION OF SYMBOLS 1 ... Fluid pressure cylinder, 2 ... Cylinder tube, 3 ... Piping (attachment object), 10 ... Band part, 20 ... 1st band member, 21 ... 1st curved part (curved part), 24 ... 1st plane part, DESCRIPTION OF SYMBOLS 30 ... 2nd band member, 31 ... 2nd bending part (curving part), 35 ... Swelling part (other end part), 37 ... 2nd plane part, 40 ... Pipe holder (holding member), 50 ... 1st volt | bolt (First male screw member), 51 ... second bolt (second male screw member), 55 ... first nut (first female screw portion), 56 ... second nut (second female screw portion), 100 ... mounting fixture, S ... Inside space

Claims (4)

A mounting fixture for mounting a mounting object on the outer periphery of a cylinder tube of a fluid pressure cylinder,
A band portion formed of a first band member and a second band member, each of which is formed in a half shape having a curved portion curved along the outer periphery of the cylinder tube, and sandwiches the cylinder tube from the outer periphery;
A holding member for holding the attachment object;
A first male screw member that connects one ends of the first band member and the second band member;
An attachment fixture comprising: the other end of the first band member, the other end of the second band member, and a second male screw member that passes through and connects the holding member. The other end portion of the first band member has a flat first plane portion,
The other end portion of the second band member has a flat second plane portion,
The said 2nd external thread member inserts the said 1st plane part and the said 2nd plane part, and connects the other end part of the said 1st band member and the said 2nd band member to Claim 1 characterized by the above-mentioned. The mounting fixture described.   The other end portion of the second band member is a bulging portion that protrudes radially outward of the cylinder tube from the curved portion and divides an inner space with the outer peripheral surface of the cylinder tube. The mounting fixture according to claim 1 or 2. A first female thread portion provided at the one end of the first band member and into which the first male thread member is screwed;
The attachment according to any one of claims 1 to 3, further comprising a second female screw portion provided at the other end portion of the first band member and into which the second male screw member is screwed. Fixture.

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