JP6435372B1 - Cylindrical joint hardware and housing structure using the cylindrical joint hardware - Google Patents

Abstract

Kind Code: A1 The present invention reduces the risk of damaging wood or deforming hardware itself more than conventional products. A metal body 11 provided with pin insertion holes 11a and 11b into which pins are inserted in a direction perpendicular to the longitudinal direction and having openings 11c and 11d at both ends in the longitudinal direction; A lid 12 provided by extending from the peripheral edge of at least one opening in the longitudinal direction of the metal main body 11 to the opposite side through the connecting portion 13 beyond the center of the opening 11c of the metal main body 11. 11, the lid portion 12, and the connecting portion 13 are integrally formed from a single steel plate, and the connecting portion 13 is bent with respect to the hardware body 11 to provide the lid portion 12 on the hardware body 11. [Selection] Figure 5

Description

  The present invention relates to a cylindrical joint metal that joins wood together and a housing structure using the cylindrical joint metal.

Various types of cylindrical joint hardware have been proposed as hardware for joining vertical members such as columns and wood such as horizontal members such as foundations and beams (see, for example, Patent Documents 1 to 4).
In the joining of wood using a cylindrical joint metal, while processing a hollow hole (groove part) so that the said cylindrical joint metal fitting is inserted in the joint part of the wood which should be joined, it is in the direction orthogonal to the tenon hole. A pin insertion hole is formed so that the drift pin can be inserted, and after the cylindrical joint metal is embedded in the hole, the pin insertion hole of the wood and the cylindrical joint metal is aligned, and the wood and the cylindrical joint metal are aligned. The drift pin is inserted and joined so as to pass through.

Japanese Patent No. 5342837 Japanese Patent No. 5189867 JP-A-11-350597 Japanese Patent No. 36777621

  However, the cylindrical joint hardware described in Patent Literatures 1 to 3 described above has both ends of the cylindrical joint hardware open, and the cylindrical joint hardware described in Patent Literatures 2 and 3 has an opening from the periphery of the opening. Although an inclined surface that is inclined toward the center is provided, most of the opening is exposed, so when fitting a cylindrical joint fitting into a hollow hole formed in the wood, the periphery of the opening hits the wood and damages the wood. In addition, there is a problem that the hardware itself may be deformed, and it takes time for the fitting operation.

  Further, in the cylindrical joint metal article described in Patent Document 4 described above, the insertion guide part in which the projecting pieces are inclined is provided at both ends of the cylindrical joint metal part. Since it is configured to abut against wood or a hole formed in the wood, there remains a possibility that the wood may be damaged or the hardware itself may be deformed.

  Therefore, the present invention has been made paying attention to such a problem, and uses a cylindrical joint metal and a cylindrical joint metal which are less likely to damage wood or deform the metal itself than conventional products. The purpose is to provide a house structure.

In order to solve the above-mentioned problem, a cylindrical joint metal according to the present invention is a cylindrical joint metal that joins wood pieces, and a pin is inserted in a direction orthogonal to the longitudinal direction of the cylindrical joint metal. An opening of the hardware main body is provided with a fitting main body provided with an opening at both ends in the longitudinal direction, and a connecting portion of at least one peripheral edge of the hardware main body in the longitudinal direction. beyond central parts have a lid portion which is formed so as to extend to the other side, the lid portion is molded integrally without seam, said hardware main body, and the lid portion, one from said connecting portion It is composed of a single steel plate, and the lid is provided on the hardware body by bending the connecting portion .
Here, the lateral width of the connecting portion may be configured to be narrower than the lateral width and longitudinal width of the lid portion.
Also, before Kifuta unit, as an outline in plan view, it has the sides of the pair of curved opposed symmetric with respect to the center of the opening of the hardware main body and a pair of linear shape sides, The radius of the side of the pair of curved shapes is larger than the radius of the inner surface of the hardware main body with respect to the center of the opening of the hardware main body and is equal to or less than the radius of the outer surface of the hardware main body, Of the straight sides, one of the straight sides is connected to one end of the hardware main body via the connecting portion, and the pair of linear sides and the inner surface of the hardware main body are viewed in plan view. It is even better if a gap is formed between the two.
Moreover, the housing structure according to the present invention is characterized by using any of the above-described cylindrical joint hardware.

The cylindrical joining hardware according to the present invention is provided with pin insertion holes into which pins are inserted in a direction orthogonal to the longitudinal direction of the cylindrical joining hardware, and openings are provided at both ends in the longitudinal direction. And a lid provided by extending to the opposite side beyond the center of the opening through a connecting portion at the periphery of at least one opening in the longitudinal direction of the metal body.
Therefore, according to the cylindrical joint hardware according to the present invention and the housing structure using the cylindrical joint hardware, the lid portion extends beyond the center of the opening portion on the side where the lid portion is provided to the opposite side. Since most of the opening will be blocked, the center of the cylindrical joint metal and the center of the top hole were misaligned when the cylindrical joint metal was passed through the side hole formed in the wood from the lid side. Even in this case, the lid portion abuts against the edge portion around the entrance hole, so that the wood body is damaged or the hardware itself is deformed as compared with the case where the end portion of the hardware body abuts against the edge portion around the entrance hole. This can be reduced.
In addition, since the lid part is integrally formed seamlessly, when the cylindrical joint metal piece is inserted into the tenon hole formed in the wood, the center of the cylindrical joint metal part is shifted from the center of the tenon hole, and the lid part is at the entrance of the tenon hole. Even if it touches the peripheral edge, the seam of the lid does not get caught on the peripheral edge of the hole entrance, so that it is possible to reduce damage to the wood and improve work efficiency. it can.

It is a front view which shows the case where the cylindrical joining metal fitting of embodiment which concerns on this invention is used for joining of a base and a pillar. It is a partial section expansion front view which expands and shows the principal part at the time of using the cylindrical metal joint of the embodiment concerning the present invention for joining to a base and a pillar. It is a front view which shows the case where the cylindrical joining metal fitting of embodiment which concerns on this invention is used for joining of pillars. It is a partial section expansion front view which expands and shows the important section at the time of using the cylindrical metal joint of the embodiment concerning the present invention for joining columns. It is a front view of the cylindrical joining metal fitting of the embodiment concerning the present invention. It is the sectional view on the AA line in FIG. It is a right view of the cylindrical joining metal fitting of the embodiment concerning the present invention. It is a left view of the cylindrical joining metal fitting of the embodiment concerning the present invention. It is the BB sectional view taken on the line in FIG. It is a rear view of the cylindrical joining metal fitting of the embodiment concerning the present invention. (A), (b) It is the top view and bottom view of the cylindrical joining metal fitting of embodiment which concern on this invention, respectively. It is an expanded view of the cylindrical joining metal fitting of embodiment which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a cylindrical joint hardware according to the present invention and a housing structure using the cylindrical joint hardware will be described in detail with reference to the accompanying drawings. The embodiment described below is merely an example of the present invention, and the present invention is not limited to the embodiment described below.

  The cylindrical joint hardware 1 according to the embodiment is made of wood, for example, a base 2 and a pillar 3 as shown in FIGS. 1 and 2, two pillars 3 and 3 as shown in FIGS. Although not shown, it is a hardware that joins wood in a house structure such as a pillar and a beam or a torsion, and includes a hardware body 11, a lid 12, and a connecting part 13 as shown in FIGS. As shown in FIGS. 1 to 4, the base 2 and the pillar 3 are inserted into the hollow holes 21 and 31 having a round hole shape and formed in advance in a plan view by a drill or the like.

  Here, since the cylindrical metal fittings 1 inserted into the hollow holes 21 and 31 are fixed to the base 2 and the columns 3 and the columns 3 and 3 to be joined by the drift pins 4 as shown in FIGS. The base 2 and the pillar 3 are also formed with pin insertion holes into which the drift pins 4 are inserted.

(Hardware body 11)
The metal main body 11 is long and has a substantially circular cross section as shown in FIGS. 5 to 11, and the drift pin 4 (see FIGS. 1 to 4) in a direction orthogonal to the longitudinal direction of the cylindrical joint metal 1. Pin insertion holes 11a and 11b are provided, and circular openings 11c and 11d are provided at both ends in the longitudinal direction.

  As shown in FIGS. 5 to 10 and the like, the pin insertion holes 11a near the end on the side where the lid portion 12 is provided are provided at four positions at intervals of 90 degrees, and the inner diameter thereof is the drift pin 4 to be inserted. In accordance with the outer diameter of the pin insertion hole 11b, the inner diameter of the pin insertion hole 11b is close to the end on the side where the lid 12 is not provided. That is, by selecting the two pin insertion holes 11a passing through the center of the hardware body 11 out of the four pin insertion holes 11a near the end on the side where the lid portion 12 is provided, the insertion direction of the drift pin 4 is changed. It can be changed by 90 degrees.

  On the other hand, the pin insertion hole 11b close to the end on the side where the lid portion 12 is not provided has two pin insertion holes 11b facing each other through the center of the hardware body 11, as shown in FIGS. The metal body 11 is provided in three steps at predetermined intervals in the longitudinal direction of the hardware body 11 so as to intersect each other by 90 degrees. The inner diameter of the hardware body 11 depends on the outer diameter of the drift pin 4 to be inserted. It is formed larger than the inner diameter of the pin insertion hole 11a close to the end on the provided side.

(Cover 12)
As shown in FIGS. 5 to 10 and the like, the lid 12 has an edge of at least one opening peripheral edge in the longitudinal direction of the metal body 11, that is, the peripheral edge of the upper opening 11c in FIGS. As shown in FIGS. 11 (a) and 11 (b), it is provided so as to close most of the opening 11c on the side where the lid 12 is provided. .

  That is, as shown in FIGS. 11A and 11B, the lid 12 is provided by extending to the opposite side beyond the center X of the opening 11c of the hardware body 11 via the connecting portion 13, which will be described later. Thus, the lid 12 is configured to block most of the opening 11c of the metal body 11, that is, to cover the opening 11c except for the gaps 14 and 15 and the through hole 12d in plan view.

  As will be described later, the through-hole 12d is provided to facilitate removal of the processing liquid when performing the surface treatment such as plating, rust prevention, and coating on the inside of the cylindrical joint metal 1, but in this embodiment, If the gaps 14 and 15 are formed between the lid 12 and the metal body 11, and the treatment liquid can be sufficiently removed from the gaps 14 and 15, the through hole 12 d may be omitted.

  As shown in FIGS. 11A and 11B, the outline of the lid 12 in plan view is a pair of curved sides that are symmetrically opposed to the center X of the lid 12 (hereinafter abbreviated as curved sides). And 12a and 12a and a pair of linear sides (hereinafter sometimes abbreviated as linear sides) 12b and 12c, and the inner side of the pair of linear sides 12b and 12c. 11 (a) and 11 (b), the left straight side 12c is connected to one end of the hardware body 11 via the connecting portion 13.

  On the other hand, the radius R1 of the pair of curved sides 12a, 12a is larger than the radius R2 of the inner surface 11e of the hardware body 11 with respect to the center of the opening 11c of the hardware body 11, and the outer surface of the hardware body 11 In this embodiment, the relationship of R2 <R1 <R3 is established.

  Therefore, when the lid 12 of the cylindrical joint 1 according to the embodiment is struck with a tool and inserted into the hollow 3 of the pillar 3 or the base 2 that is wood, the other pillar is placed on the lid 12 of the cylindrical joint 1. When the three end faces come into contact with each other, the ends of the pair of curved sides 12a and 12a in the lid 12 come into contact with the end of the peripheral edge of at least one opening 11c in the longitudinal direction of the metal body 11. It is possible to prevent the portion 12 from being deformed as much as possible, and to prevent the metal portion 11 from being recessed into the opening 11c.

  At this time, in this embodiment, the upper surface of the lid portion 12 abuts on the peripheral edge portion of the pillar 3 and the base hole 2 of the pillar 2, and the edge portion of the peripheral edge of the opening 11 c of the metal body 11 is Since the contact with the peripheral edge of the hole is reduced, it is possible to prevent the wood side such as the pillar 3 and the base 2 from being damaged.

  Further, the pair of linear sides 12b and 12c of the lid portion 12 are formed with gaps 14 and 15 between the inner side surface 11e of the hardware main body 11 in plan view and the center of the lid portion 12 respectively. A through-hole 12d is formed in X.

  Therefore, when performing the surface treatment such as plating treatment, rust prevention, painting, etc. on the inside of the cylindrical joint metal fitting 1 of the embodiment, the treatment liquid is supplied from the gaps 14 and 15 between the lid portion 12 and the hardware main body 11 and the through holes 12d. Since it becomes easy to pull out, the quality of the cylindrical metal joint 1 can be improved.

  Moreover, since the cover part 12 has a pair of linear shape sides 12b and 12c as a contour line in plan view, as shown in FIG. When the steel plate is developed in a state of being cut or punched, the straight side 12b becomes a straight line in the same manner as the edges constituting the openings 11c and 11d of the hardware body 11.

  Therefore, when producing the expanded cylindrical joint 1 from a steel plate by cutting or punching, the waste of the steel plate can be reduced as much as possible, and the cylindrical joint 1 can be manufactured efficiently.

  Further, as shown in FIG. 5 to FIG. 10, the lid portion 12 is configured to have a convex shape toward the outside, that is, curved so as to bulge upward in FIG. 5 to FIG. 10. Yes.

  Therefore, as described above, when the lid 12 of the cylindrical joint 1 according to the embodiment is struck with a tool and inserted into the hollow hole of the pillar 3 or the base 2 that is wood, the lid 12 of the cylindrical joint 1 When the end surface of the other pillar 3 comes into contact with the lid portion 12, the lid portion 12 is configured to be curved outwardly so that the strength of the lid portion 12 is improved as compared with the plan view and the planar shape. It is possible to prevent the cover 12 from being deformed as much as possible, and to prevent the cover 12 from being damaged when it hits the wood side such as the pillar 3 or the base 2.

  Further, since the lid portion 12 is configured to be bent in a convex shape on the outside as viewed from the front, treatment liquid such as plating treatment, rust prevention, painting, etc. is easily collected on the back side of the lid portion 12. Through the through hole 12d, the treatment liquid that tends to accumulate on the back side of the lid 12 can be easily discharged.

(Connecting part 13)
As described above, the connecting portion 13 connects the hardware main body 11 and the lid portion 12, and as shown in FIGS. 11 (a) and 11 (b), the lateral width W1 is the lateral width W2 and the longitudinal width W3 of the lid portion 12. Smaller and thinner.

  Therefore, since the strength of the connecting portion 13 is weaker than that of the lid portion 12, when the cylindrical joint 1 is passed from the lid portion 12 side through the burrow hole formed in the wood, the lid portion 12 is an edge around the horn hole entrance. When contacting the part, the connecting part 13 bends and absorbs external force, so that it is possible to prevent the wood from being damaged.

  Further, as shown in FIGS. 11A and 11B, the length L of the connecting portion 13 in plan view is configured to be larger than the thickness T of the hardware main body 11, Gaps 15 are formed between the side surface 11e and the side surfaces of the pair of linear sides 12c of the lid portion 12, respectively.

(State before bending cylindrical joint metal fitting 1 of embodiment)
FIG. 12 shows a state before bending of the cylindrical joining hardware 1 of the embodiment, that is, a state in which it is cut or punched from a flat steel plate.

  That is, the state before bending of the cylindrical joint hardware 1 of the embodiment is as shown in FIG. 12, and the left and right side edge portions 11g and 11h that are abutted when the metal body 11 is bent into a circle are shown in FIG. As shown, convex portions 11g1, 11g3, 11g5 and concave portions 11g2, 11g4 are formed on the side edge portion 11g side, while concave portions 11h1, 11h3, 11h5 and convex portions 11h2, 11h4 are formed on the side edge portion 11h side.

  Then, a steel plate formed as shown in FIG. 12 is inserted with a mold (not shown) or the like and bent into a circle so that the left and right side edge portions 11g and 11h face each other, and finally the side edge portion 11g. The side convex portions 11g1, 11g3, 11g5 and the concave portions 11g2, 11g4 are bent so as to contact or be close to the concave portions 11h1, 11h3, 11h5 and the convex portions 11h2, 11h4 on the side edge portion 11h side, respectively. A shaped hardware body 11 is formed. Thereby, even if it does not weld the side edge parts 11g and 11h, the intensity | strength of the metal main body 11 can be improved.

  Thereafter, the connecting portion 13 is bent about 90 degrees with respect to the cylindrical hardware main body 11 as shown in FIGS. 5 to 10, and the lid portion 12 is opened to the hardware main body 11 except for the gaps 14 and 15 and the through hole 12 d. The part 11c is closed.

  5 to 10, the connecting portion 13 is first bent about 90 degrees, and then the left and right side edge portions 11 g and 11 h are bent so as to face each other. The hardware body 11 may be configured.

  Therefore, in the cylindrical joint hardware 1 of the embodiment and the housing structure using the cylindrical joint hardware 1, the hardware body 11 is connected to the opening 11 c side of the hardware body 11 via the connecting part 13 continuous with the hardware body 11. Since the lid portion 12 extending to the opposite side beyond the center X of the opening portion 11c is provided, when passing the cylindrical joint metal 1 from the lid portion 12 side through a hole formed in the wood, the center of the cylindrical joint metal 1 Even if the center of the tenon hole is deviated, the lid 12 abuts on the edge around the entrance of the tenon hole.

  As a result, according to the cylindrical joint hardware 1 of the embodiment and the housing structure using the cylindrical joint hardware 1, the edge of the peripheral edge of the opening 11 c of the hardware main body 11 is in contact with the end surface around the wood hole entrance. It is possible to reduce damage to the wood or deformation of the hardware itself as compared with the case of contact.

  In addition, when the cylindrical joint hardware 1 does not have the lid portion 12, when the wood is lowered from above and the cylindrical joint hardware 1 is fitted into the burrow hole of the wood, the end surface around the entrance hole of the timber is the opening of the hardware body 11. Although the metal body 11 may hit the periphery of the portion 11c and become unable to move, the contact area with the wood increases due to the presence of the lid 12 in this embodiment, so that the cylindrical joint 1 is recessed into the wood. In addition to being difficult, it is possible to guide the lid 12 to a predetermined position by making the lid portion 12 in a curved shape, and work efficiency can be improved.

  In particular, in the cylindrical metal joint 1 of the embodiment, as shown in FIG. 12, the hardware main body 11, the lid portion 12, and the connecting portion 13 are integrally formed by cutting or punching a single steel plate and then bending it. ing.

  Therefore, according to the cylindrical joint hardware 1 of the embodiment and the housing structure using the cylindrical joint hardware 1, there is no possibility that the lid 12 is detached or displaced from the hardware main body 11 and the product accuracy is improved. it can.

  Moreover, in the cylindrical joint metal fitting 1 of the embodiment, the connecting portion 13 that connects the hardware main body 11 and the lid portion 12 has a lateral width W1 that is the lateral width W2 of the lid portion 12 as shown in FIGS. And smaller than the vertical width W3.

  Therefore, since the strength of the connecting portion 13 is weaker than that of the lid portion 12, when passing the cylindrical joint 1 from the lid portion 12 side through the burrow hole of the wood, the lid portion 12 is at the edge around the horn hole entrance. Even in the case of contact, it is possible to prevent the wood from being damaged by bending the connecting portion 13 and absorbing external force.

  In addition, since the strength of the connecting portion 13 is weakened by reducing the width of the connecting portion 13, the force applied when the connecting portion 13 is bent to cover the opening 11c side of the metal body 11 with the lid portion 12 is minimized. As a result, the bending of the connecting portion 13 is facilitated, and the deformation of the hardware main body 11 can be prevented as much as possible when the connecting portion 13 is bent. Accuracy can be improved.

  In the cylindrical metal joint 1 of the embodiment, the radius R1 of the pair of curved sides 12a, 12a of the lid portion 12 is set to the radius of the inner surface 11e of the hardware body 11 with respect to the center of the opening 11c of the hardware body 11. It is larger than R2 and has a radius R3 or less of the outer surface 11f of the hardware body 11, and the lid 12 of the cylindrical joint hardware 1 is struck with a tool to make a pillar 3 or a base 2 of wood. When inserted into the hole or when the end face of the other pillar 3 comes into contact with the lid portion 12 of the cylindrical joining hardware 1, the end portions of the pair of curved sides 12 a and 12 a in the lid portion 12 are the hardware body 11. It is comprised so that it may contact | abut to the edge part of at least one opening part 11c of the longitudinal direction.

  Therefore, according to the cylindrical metal joint 1 and the housing structure using the cylindrical metal joint 1 according to the embodiment, the lid 12 is deformed even when the lid 12 abuts on the edge around the entrance hole. It is possible to prevent the lid portion 12 from being recessed into the opening of the hardware body 11 as much as possible.

  In addition, according to the cylindrical joint hardware 1 of the embodiment and the housing structure using the cylindrical joint hardware 1, the upper surface of the lid portion 12 abuts on the peripheral edge portion of the pillar 3 or the base 2 and the hardware main body 11. Since the end of the peripheral edge of the opening 11c is less in contact with the peripheral edge of the pillar 3 and the base hole 2 of the base 2, it is possible to prevent the wood side of the pillar 3 and the base 2 from being damaged.

  Moreover, in the cylindrical joint metal fitting 1 of the embodiment and the housing structure using the cylindrical joint metal fitting 1, the lid portion 12 is configured to be bent in a convex shape outwardly when viewed from the front. The strength is improved as compared with the case of a planar shape in a plan view, and in this respect as well, it is possible to prevent the lid portion 12 from being deformed as much as possible, and when the lid portion 12 hits the wood side such as the pillar 3 or the base 2. It can be prevented from being damaged.

  Moreover, in the housing structure using the cylindrical joint hardware 1 and the cylindrical joint hardware 1 according to the embodiment, between the pair of linear sides 12b and 12c of the lid portion 12 and the inner surface 11e of the hardware body 11 Since the gaps 14 and 15 are formed, and the through hole 12d is formed in the center X of the lid portion 12, surface treatment such as plating treatment, rust prevention, and painting of the cylindrical joint metal 1 is performed. When performing, it becomes easy to remove the processing liquid from the gaps 14 and 15 between the lid portion 12 and the metal body 11 and the through hole 12d, and the quality of the cylindrical joint hardware 1 can be improved.

  In addition, in the cylindrical joining metal object 1 of this embodiment, although the cover part 12 was provided and provided in the one opening part 11c side of the metal main body 11, it is not restricted to this in this invention, The other opening part of the metal main body 11 Of course, the lid portion 12 may be provided on the 11d side via the connecting portion 13 in the same manner as the lid portion 12 on the opening 11c side.

  Moreover, in the cylindrical metal joint 1 of the present embodiment, the lid portion 12 is configured to be curved so as to bulge outward as shown in FIGS. 5 to 10. In the invention, the present invention is not limited to this, and it may of course be constituted by a plane without being curved.

  Moreover, in the cylindrical joining metal fitting 1 of this embodiment, as shown in FIG. 12, although the hardware main body 11, the cover part 12, and the connection part 13 were comprised integrally by one steel plate, in this invention, this is shown. Not limited to this, the hardware body 11 and the lid portion 12 may be formed separately, and the hardware body 11 and the lid portion 12 may be welded together. In this case, the welded portion between the hardware main body 11 and the lid portion 12 becomes the connecting portion 13.

DESCRIPTION OF SYMBOLS 1 Cylindrical joining hardware 11 Hardware main body 11a, 11b Pin insertion hole 11c, 11d Opening part 11e Inner side surface 11f Outer side surface 11g, 11h Side edge part 11h2, 11h4, 11g1, 11g3, 11g5 Convex part 11h1, 11h3, 11h5, 11g2, 11g4 Concave portion 12 Lid portion 12a, 12a Curved side 12b, 12c Straight side 12d Through hole 13 Connecting portion 14, 15 Clearance 2 Base 21 Side hole 3 Column 31 Side hole 4 Drift pin

Claims (4)

Cylindrical joint hardware that joins wood,
A metal body provided with pin insertion holes into which pins are inserted in a direction orthogonal to the longitudinal direction of the cylindrical joint hardware, and having openings at both ends in the longitudinal direction;
It has a lid portion which is formed so as to extend to the other side beyond the center of the opening portion in the longitudinal direction of at least one of the hardware main body via the one connecting portion of the opening portion of the hardware main body, the lid Is seamlessly molded in one piece,
The hardware main body, the lid portion, and the connecting portion are integrally formed from a single steel plate, and the lid portion is provided on the hardware main body by bending the connecting portion. Characteristic cylindrical joint hardware. In the cylindrical joint metal fitting according to claim 1,
A cylindrical joint metal, wherein a width of the connecting portion is narrower than a width and a vertical width of the lid portion. In the cylindrical joint metal fitting according to claim 1 or 2,
The lid portion has, as an outline in plan view, a pair of curved sides that are symmetrically opposed to the center of the opening of the hardware body, and a pair of straight sides.
The radius of the pair of curved sides is larger than the radius of the inner surface of the hardware body with respect to the center of the opening of the hardware body, and is equal to or less than the radius of the outer surface of the hardware body,
Of the pair of straight-shaped sides, one straight-shaped side is connected to one end of the hardware main body through the connecting portion, and in plan view, the pair of linear-shaped sides and the hardware main body A cylindrical metal joint characterized in that a gap is formed between the inner side surface and the inner side surface . The housing structure using the cylindrical joining metal fitting as described in any one of Claims 1-3.

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