JP7459016B2 - Fixture - Google Patents

Description

The present invention relates to a fixture used when incorporating a panel inside a framework.

Temporary buildings intended for short-term use may be required for various reasons, such as recovery from large-scale disasters or rebuilding buildings. These temporary buildings have many cost constraints and need to be quickly set up and removed, so "prefabricated" buildings using lightweight steel frames are widely used. However, buildings that use a lot of metal, such as lightweight steel frames, can be inferior in terms of insulation and livability, and in recent years, there has been consideration of using a lot of wood for the framework and surface materials of temporary buildings as well. When it comes to connecting such wooden structures, it is desirable to move away from the traditional method of using a lot of nails in order to shorten construction times, etc.

A specific example of an alternative to nails is to embed a bar-shaped or plate-shaped metal fitting across the contact surfaces of two members, and insert pins, bolts, etc. from each member toward this metal fitting. When using such metal fittings to assemble a panel or other surface material inside a rectangular framework, if the metal fittings protrude significantly from one of the members (framework or surface material), there will be major restrictions on how the work can proceed. I will receive it. Therefore, by making the metal fittings movable and having a structure that allows the metal fittings to be completely embedded in one of the members, after placing the facing material inside the framework, the metal fittings can be moved in some way, and the frame and the surface can be moved. Placing it so that it straddles the contact surface with the material simplifies the work. Note that such a method has been used in various fields for a long time, and specific examples thereof include the patent documents mentioned below.

Patent Document 1 discloses a structure for attaching a cross member to a support column, in which both the support support and the cross member are hollow, and a semicircular engagement fitting is embedded in the end of the cross member. This engagement fitting has a structure in which it can rotate around a connecting shaft inserted so as to penetrate both sides of the cross member. Furthermore, a sickle-shaped engagement portion cut in the circumferential direction is formed in a straight section of the outer edge of the engagement fitting. In addition, elongated holes with a predetermined length are continuously formed on the side of the column, and when the engaging metal fitting is rotated, the sickle-shaped engaging part fits between the elongated holes, allowing the horizontal The timber is attached to the post. An operating rod member is attached near the outer periphery of the engagement tool, a part of which protrudes to the outside of the cross member, and by pushing this protruding part, the engagement tool rotates and supports the cross member. It can be attached to.

Patent Document 2 discloses a construction panel that uses a rotating engagement hook, which can join two adjacent panel bodies. The joining end faces of these panel bodies have recesses for attaching connecting members formed on opposite sides of the contact surface, with a rotating engagement hook attached to one side and a hook locking pestle attached to the other side. The rotating engagement hook has a bulging arc shape on one end, and an axis is inserted into the bulging part. By rotating the rotating engagement hook around this axis, the other end comes into contact with the hook locking pestle, maintaining the joining end faces of the panel bodies in a tightly joined state.

Japanese Patent Application Publication No. 2001-116025 Publication Practical Publication No. 1988-31810

As in both of the above-mentioned patent documents, a method of embedding a rotatable metal fitting near the contact surface of two members and connecting the two members via this metal fitting is widely known. Regarding this method, if the members to be connected are hollow, embedding the metal fittings is relatively easy. However, if the component is wood, it is difficult to form a large cavity inside due to considerations such as strength and processing method. Therefore, as in Patent Document 1, it is difficult to embed the "operating rod member" together with the "engaging metal fitting" inside the member, and a simple structure that does not use parts such as the "operating rod member" is introduced. Should.

Furthermore, in Patent Document 2, since the "rotating engagement type hook body" is rotated by the "shaft", the structure is simple and it is easy to embed in the panel body, but the contact surface between the rotary engagement type hook body and the shaft may become loose. If there is, the rotating engagement type hook body cannot be rotated through the shaft. Therefore, some kind of interlocking shape should be provided on the contact surfaces of both sides, but this increases the resistance when inserting the shaft into the panel body, which may worsen workability. Therefore, it is possible to increase the diameter of the hole in the panel body into which the shaft is inserted, but in that case, there will be a gap around the shaft, which will cause the rotary engagement type hook body to become loose, making it difficult to join the panel body. This will lead to new problems, such as loosening of the parts.

The present invention was developed based on these circumstances, and is used when incorporating panels inside a framework, and has a simple structure, excellent workability during construction, and also suppresses loosening after construction. The purpose is to provide a possible fixation device.

The invention described in claim 1 for solving the above problem is a fastener for connecting one material and a counterpart material adjacent to each other, which comprises a hook, a fulcrum pin, and a locking pin, one end of the hook is provided with a central hole for inserting the fulcrum pin, and the other end of the hook is provided with a connection part into which the locking pin fits, the hook is accommodated in an internal space consisting of an accommodation groove on the one material side and an opposing groove on the counterpart material side, and the hook can be accommodated in its entirety in the accommodation groove, and when the hook is accommodated in the accommodation groove, the surface of the one material is fixed to the hook. By inserting the fulcrum pin from the surface toward the center hole, the hanging piece becomes rotatable around the fulcrum pin, the locking pin is inserted so that it intersects with the opposing groove, a part of the hanging piece enters the opposing groove, and the locking pin fits into the connection part, connecting the one material and the other material, the fulcrum pin has a circular cross section, and a convex ridge that protrudes outward is formed on the section of its side surface that contacts the center hole, and the ridge bites into the inner surface of the center hole, allowing the fulcrum pin and the hanging piece to rotate together.

The fixing device according to the present invention is used to connect two members that are in surface contact, and is mainly composed of three elements: a hanging piece, a fulcrum pin, and a locking pin, and these parts are embedded near the contact surfaces of the two members. . Although these two materials are mainly assumed to be wood, they are not limited to this, and can be freely selected from metal, synthetic resin, etc. Furthermore, in order to distinguish between these two materials, one of them can be used. In addition to referring to one material as the other material, the other material will be referred to as the other material. In addition, in order to embed the fixing device, it is necessary to machine grooves that extend inward from the contact surfaces of both materials.The groove on the one material side is called the accommodation groove, and the groove on the other material side is It shall be called an opposing groove. When one member and the other member are brought into surface contact at their original positions, the accommodation groove and the opposing groove are lined up without any difference in level, forming one internal space. In addition, multiple fixing tools are usually used for one piece of material.

The hanging piece is a metal plate embedded in the internal space formed by the accommodation groove and the opposing groove, and is positioned so as to straddle the contact surfaces of the one material and the other material. Furthermore, a fulcrum pin is inserted from the surface of the one material toward the hanging piece, and a locking pin is inserted from the surface of the other material toward the hanging piece, thereby connecting the one material and the other material via the hanging piece. A central hole for inserting the fulcrum pin is formed on one end of the hanging piece, and a connection part for inserting the locking pin is formed on the other end of the hanging piece. The connection part may be a hole that is closed all around, or it may be a groove that enters from the outer periphery of the hanging piece.

The hanging piece is configured to be rotatable around the fulcrum pin, and the shape of each part is adjusted so that the entire hanging piece enters the accommodation groove by rotating the hanging piece around the fulcrum pin. Furthermore, by rotating the hanging piece, a part of it (the side away from the fulcrum pin) protrudes from the accommodation groove and enters the opposing groove. Then, by fitting the locking pin into the connecting portion of the hanging piece, one member and the other member are connected via the hanging piece. The fulcrum pin is inserted on the surface of one member at a position slightly apart from the contact surface between the one member and the other member, intersects with the accommodation groove (hanging piece) on the way, and reaches the depth thereof. Further, the locking pin is inserted into the surface of the other member at a position slightly apart from the contact surface between the one member and the other member, intersects with the opposing groove on the way, and reaches the depth thereof.

The hanging piece shall be able to rotate integrally with the fulcrum pin. Therefore, on the side circumferential surface of the fulcrum pin, a convex strip that protrudes outward is formed in the section where it enters the center hole of the hanging piece, and this bites into the inner circumferential surface of the center hole, causing the fulcrum pin and the hanging piece to slip. Unify without any hassle. Therefore, when the fulcrum pin is rotated, the hanging piece also rotates together with it.The entire hanging piece is housed in the storage groove in advance, and after making surface contact between one piece and the other piece at their original positions, the fulcrum pin is rotated. By rotating the hanging piece through the pin and fitting the locking pin into the connecting portion, one member and the other member are connected through the hanging piece. Note that the hole made in one member to insert the fulcrum pin must have an inner diameter that does not create a gap with the fulcrum pin to prevent the hanging piece from loosening. In addition, since the fulcrum pin and the locking pin are embedded in one member or the other member, only their end surfaces are exposed to the outside.

The protruding strip on the fulcrum pin is not formed to connect both ends of the fulcrum pin, but is formed only in the section where it enters the center hole of the hanging piece after the fulcrum pin is inserted into one piece. do. The presence of the protrusions increases the resistance when inserting the fulcrum pin into one piece of material, but by limiting the range, this resistance can be suppressed, as well as the scraping of one piece due to the protrusions. . Moreover, since the convex strip does not reach the back side of the hanging piece based on the insertion direction of the fulcrum pin, on the back side of the hanging piece, one side member and the fulcrum pin are in surface contact without any gap, and the one side member and the fulcrum pin are in surface contact with each other without any gap. This can prevent loosening.

During construction, embed the hanging piece in the storage groove of one piece, leave the center hole in place, and then insert the fulcrum pin from the surface of the piece to the center hole. At this stage, the entire hanging piece is embedded in the storage groove. For the other material, a locking pin is inserted so as to intersect with the opposing groove. After making surface contact between one member and the other at their original positions, the fulcrum pin is rotated, a part of the hanging piece reaches the opposing groove, and the locking pin is fitted into the connecting part of the hanging piece. . Note that by forming an angular recess or convex portion on the end face of the fulcrum pin, the fulcrum pin can be rotated with a tool even after the fulcrum pin is completely embedded in one member. In addition, depending on the configuration of the connection part, the locking pin may be inserted after rotating the hanging piece.

In this way, the fixture consists of a hanging piece, a fulcrum pin, a locking pin, etc., and the hanging piece has a center hole for inserting the fulcrum pin and a connecting part for fitting the locking pin, and the fulcrum pin By rotating the hanging piece and fitting the locking pin into the connection part of the hanging piece, one member and the other member can be connected. In addition, the fulcrum pin has a protruding strip formed only in the section where it contacts the hanging piece, which allows the fulcrum pin and the hanging piece to be integrated without loosening, and also suppresses the resistance that occurs between one side and the other, making insertion smooth. can be done.

As in the invention described in claim 1, the fastener is composed of a hanging piece, a fulcrum pin, and a locking pin, and the hanging piece is provided with a central hole for inserting the fulcrum pin and a connection part for fitting the locking pin, and the hanging piece is rotated by the fulcrum pin, and the locking pin fits into the connection part of the hanging piece, thereby connecting the one material and the other material. Therefore, in the present invention, the one material and the other material are brought into surface contact without the hanging piece protruding from the one material, and the one material and the other material can be connected by rotating the hanging piece, which reduces restrictions on the configuration of the one material and the other material. A specific example of such one material and the other material is a case where the one material is a plate material such as a panel and the other material is a frame that surrounds it, and a construction method in which the one material is incorporated inside the assembled other material can be easily realized.

Regarding the fulcrum pin that rotates the hanging piece, a convex strip shall be formed only in the section where it comes into contact with the hanging piece when the insertion is completed. Therefore, the fulcrum pin and the hanging piece can be integrated without loosening, and the resistance generated between the two parts is suppressed, allowing smooth insertion. As a result, there is no need to ensure a gap between the inner diameter of the hole drilled in one material to insert the fulcrum pin, and it is possible to prevent the loosening of one material and the fulcrum pin. It will fit tightly without loosening. Furthermore, by integrating the fulcrum pin and the hanging piece with the protruding strip, the structure of the fixture becomes extremely simple.

It is a perspective view showing an example of the shape and an example of use of the fixture according to the present invention, and it is assumed that one member is incorporated inside a framework constituted by the other member. Note that the lower part of the figure shows an enlarged view of the upper left periphery of one member, and the one member and the other member here are drawn in vertical cross section. 2 is a perspective view showing a process of connecting one member and a counterpart member in FIG. 1, in which the upper left periphery of one member is enlarged, and the one member and the counterpart member are drawn in vertical cross section. Note that the outline of the upper left periphery of the one member is drawn in the lower left part of the drawing. FIG. 2 is a perspective view showing a state in which the connection between one member and the other member is completed after FIG. The outline is drawn. 2 is a perspective view showing a case where the counterpart member in FIG. 1 is extended in the horizontal direction and a plurality of one members are assembled thereto. In addition, the lower right portion of the figure shows the details of the protruding strip of the fulcrum pin. It is a perspective view showing an example of the shape of a hanging piece, and here a connection part of a hanging piece is made into a round hole.

FIG. 1 shows an example of the shape and use of a fixture according to the present invention, and it is assumed that one member 41 is incorporated inside a framework composed of other members 51, 52, etc. The one member 41 here is a flat panel, and the upper surface of the one member 41 is in surface contact with the other member 51, which is the upper frame, and fixing devices are installed at two places on the left and right of this contact surface. and the other member 51 are connected. Further, the lower surface of the one member 41 is in surface contact with the other member 52, which is a lower frame, and fixing devices are installed at two places on the left and right of this contact surface to connect the one member 41 and the other member 52. Therefore, one member 41 is connected to the other members 51 and 52 via fixing devices at four upper and lower locations. In addition, the upper and lower members 51 and 52 are integrated by a vertical frame 53 and a middle frame 54. The vertical frame 53 is in contact with the end surfaces of the other members 51 and 52, but the middle frame 54 is sandwiched between the upper and lower members 51 and 52. Note that the other members 51 and 52, the vertical frame 53, and the middle frame 54 are firmly integrated by some means.

The fixture is composed of a hanging piece 11, a fulcrum pin 21, a locking pin 38, etc. Among them, the hanging piece 11 is a band-shaped metal plate, and one end thereof has a center hole 17 and a lock hole 15 formed therein. A fulcrum pin 21 is inserted into the center hole 17, and a lock pin 35 is inserted into the lock hole 15. Further, on the other end side of the hanging piece 11, a connecting portion 18 cut into a valley shape is formed, and a locking pin 38 is fitted into this connecting portion 18. A housing groove 46 for embedding the hanging piece 11 is formed in the one side member 41. Accommodating grooves 46 are formed at four locations on one side member 41 according to the arrangement of the fixture, and an enlarged cross-section of the upper left periphery is shown at the bottom of the figure.

As shown in the lower part of the figure, the accommodation groove 46 is machined along the center line of the top surface of the one member 41, and is large enough to embed the entire hanging piece 11. In addition, a holding hole 47 is machined through both sides of the one member 41 to insert the fulcrum pin 21, and the holding hole 47 intersects with the accommodation groove 46 halfway. The lengths of the fulcrum pin 21 and the holding hole 47 are the same, so that the fulcrum pin 21 does not protrude from the side of the one member 41 after insertion. When the fulcrum pin 21 integrated with the hanging piece 11 is rotated, the connection part 18 of the hanging piece 11 and the like protrude from the accommodation groove 46. In addition, the small hole 45 adjacent to the holding hole 47 is for inserting the lock pin 35, and when the lock hole 15 of the hanging piece 11 is aligned concentrically with the small hole 45, inserting the lock pin 35 there will prevent the hanging piece 11 from rotating.

In the other members 51 and 52, a facing groove 56 is machined at a location facing the accommodation groove 46 of the one member 41. The accommodation groove 46 and the opposing groove 56 are lined up without any difference in level and form one internal space. Further, the facing groove 56 has a size that can comfortably accommodate the hanging piece 11 protruding from the one member 41. Further, in order to insert the locking pin 38 arranged to intersect with the opposing groove 56, a pin hole 58 is formed through both sides of the other members 51 and 52. The pin hole 58 has an inner diameter that can hold the locking pin 38 without loosening. The shape of each part is adjusted so that a part of the hanging piece 11 enters the opposing groove 56, and when the hanging piece 11 eventually stands upright, the locking pin 38 fits into the back of the connecting part 18 without loosening. . With the hanging piece 11 standing upright in this way, the fulcrum pin 21 and the locking pin 38 are integrated by the hanging piece 11, and the connection between the one member 41 and the other members 51 and 52 is completed. By subsequently inserting the lock pin 35, this connection cannot be released.

Regarding the fulcrum pin 21, a plurality of protrusions 27 are formed near the center thereof, but the other sections have a simple circular cross section. Note that the protrusion 27 is formed only in a section that contacts the center hole 17 of the hanging piece 11 in a state after the fulcrum pin 21 is inserted into the holding hole 47. In addition, the protruding strip 27 protrudes outward from the side circumferential surface of other sections (sections with a circular cross section in which the protruding strip 27 is not formed), and by contacting the inner circumferential surface of the center hole 17, the fulcrum The pin 21 and the hanging piece 11 are integrated, and when the fulcrum pin 21 is rotated, the hanging piece 11 also rotates together.

Each ridge 27 extends along the axial direction of the fulcrum pin 21. Therefore, when the fulcrum pin 21 is inserted into the retaining hole 47, the bite mark formed by the ridge 27 on the inner peripheral surface of the retaining hole 47 extends along the axial direction of the retaining hole 47, and the entire inner peripheral surface of the retaining hole 47 is not scraped by the ridge 27. Therefore, when the fulcrum pin 21 is inserted, the fulcrum pin 21 can be held without loosening even in the section of the retaining hole 47 through which the ridge 27 passes. In addition, based on the insertion direction of the fulcrum pin 21, the ridge 27 does not reach the back side of the hanging piece 11. As a result, in the retaining hole 47, the section behind the hanging piece 11 is not affected by the ridge 27, and the retaining hole 47 and the fulcrum pin 21 are in close contact with each other, preventing the fulcrum pin 21 from loosening.

A square hole 28 with a square cross section is formed in the end face of the fulcrum pin 21. This is for fitting a tool for rotating the fulcrum pin 21, and by using this, the hanging piece 11 can be freely rotated even after the fulcrum pin 21 is inserted into the holding hole 47. In addition, at the time of construction, immediately before assembling the one member 41 into the other members 51 and 52, all the hanging pieces 11 are embedded inside the one member 41 as shown in the figure. As a result, the one side member 41 can be easily assembled inside the framework surrounded by the other side members 51, 52, etc., and then by rotating all the hanging pieces 11, the one side member 41 and the other side members 51, 52 can be assembled. The connection with is completed.

FIG. 2 shows the process of connecting the one member 41 and the other member 51 in FIG. There is. The entire hanging piece 11 is accommodated in the accommodation groove 46 of the one member 41, and the hanging piece 11 is rotatable about the fulcrum pin 21. Further, regarding the other member 51, a locking pin 38 is inserted, and its intermediate portion intersects with the opposing groove 56. When the one member 41 and the other member 51 are brought into surface contact as shown in the lower right of the figure, the accommodation groove 46 and the opposing groove 56 are lined up without any difference in level. In this state, when a tool such as a bar wrench is fitted into the square hole 28 on the end face of the fulcrum pin 21, the hanging piece 11 can be rotated via the fulcrum pin 21. Note that the outer shape of the upper left periphery of the one member 41 is drawn at the lower left of the figure. In this way, the hanging piece 11 is entirely embedded in the housing groove 46, and the side surface of the one piece 41 is lined with a holding hole 47 and a small hole 45.

In this figure, the protruding strip 27 is exposed on the side surface of the hanging piece 11 in a state where the fulcrum pin 21 has been inserted. However, in reality, the section in which the protrusion 27 is formed is limited and is not clearly exposed like this. Therefore, when the fulcrum pin 21 is rotated with a tool, large friction does not occur between the protrusion 27 and the one member 41, and the connection between the one member 41 and the other member 51 can be completed without difficulty.

FIG. 3 shows a state in which the connection between one member 41 and the other member 51 is completed after FIG. The outlines of these are drawn below. After FIG. 2, when the fulcrum pin 21 is rotated to make the hanging piece 11 stand upright, the locking pin 38 is fitted deep into the connecting part 18, and the fulcrum pin 21 and the locking pin 38 are integrated with the hanging piece 11. The connection between the one member 41 and the other member 51 is completed. Furthermore, by inserting the lock pin 35, the hanging piece 11 becomes unrotatable, and the connection between the one member 41 and the other member 51 cannot be released.

When all of the fulcrum pins 21, lock pins 38, and lock pins 35 have been inserted, only their end surfaces are exposed to the outside. Furthermore, the hanging piece 11 is accommodated in an internal space in which the accommodation groove 46 and the opposing groove 56 are integrated, and is completely invisible from the outside. In the figure, only the upper left periphery of the one side member 41 is depicted, but the configurations of the remaining three locations are exactly the same, although the arrangement of the hanging pieces 11 etc. is different.

In this way, in the present invention, exposure of metal parts can be suppressed to a minimum, so when wood is used for the one side member 41, the other side member 51, etc., the natural atmosphere is not spoiled. Furthermore, if you embed the hanging piece 11 and insert the locking pin 38 in advance during construction, all you need to do on site is to bring the one side member 41 and the other side member 51 into surface contact at their original positions, and then rotate the fulcrum pin 21. The connection between the one member 41 and the other member 51 is completed. Furthermore, when dismantling the structure after construction, the connection is released by simply removing the lock pin 35 and rotating the fulcrum pin 21, allowing the work to proceed quickly.

FIG. 4 shows a case where the other members 51 and 52 of FIG. 1 are extended in the horizontal direction and a plurality of one members 41 are incorporated therein. Here, the upper and lower materials 51 and 52 extend horizontally, and a plurality of middle frames 54 are arranged to connect them, and are divided by the materials 51 and 52, the vertical frame 53, and the middle frame 54. One side member 41 is installed in a rectangular space. In the present invention, after constructing a framework composed of the other members 51, 52, etc., the one member 41 like a panel can be connected to the inside thereof, and there are fewer restrictions on the construction procedure. The connection between the members 51 and 52 can be completed by simply rotating the hanging piece 11. Therefore, if the present invention is introduced into various types of temporary buildings, not only can the construction be carried out quickly, but also the subsequent removal can be carried out quickly.

The lower right of this figure shows the details of the convex strip 27 of the fulcrum pin 21. The convex strip 27 is formed by locally pressing the center of the side circumferential surface of the fulcrum pin 21 with a cutting tool and locally raising the adjacent portion. Therefore, the area near the top of the convex strip 27 protrudes outward from the side circumferential surface of the section where the convex strip 27 is not formed, which allows the fulcrum pin 21 and the hook piece 11 to be integrated. Note that the dashed-dotted circle in the figure indicates the side circumferential surface of the section where the convex strip 27 is not formed.

FIG. 5 shows an example of the shape of the hanging piece 12, in which the connecting portion 19 of the hanging piece 12 is a round hole. The shape of the hanging piece 12 can be changed freely, and it can be a simple band shape as shown in this figure, and the connecting part 19 can also be a round hole. In this case, after rotating the hanging piece 12 embedded in the accommodation groove 46 of the one member 41 and letting its connecting portion 19 reach the inside of the opposing groove 56, the pin hole 58 of the other member 51 and the hanging piece 12 are connected. When the connecting portions 19 are aligned concentrically and the locking pin 38 is then inserted into the pin hole 58, the fulcrum pin 21 and the locking pin 38 are integrated by the hook 12, and the one member 41 and the other member 51 The connection with is completed. In this configuration, the locking pin 38 becomes unrotatable by insertion of the locking pin 38, and the locking pin 35 as shown in FIG. 1 is unnecessary, but the locking pin 38 cannot be inserted into the other member 51 in advance.

11 Hanging piece (connection part is groove-shaped)
12 Hanging piece (connection part has a round hole shape)
15 Lock hole 17 Center hole 18 Connection part (groove-shaped)
19 Connection part (round hole type)
21 Fulcrum pin 27 Convex strip 28 Square hole 35 Lock pin 38 Locking pin 41 One side member (panel)
45 Small hole 46 Accommodating groove 47 Holding hole 51 Other material (upper frame)
52 Other material (lower frame)
53 Vertical frame 54 Middle frame 56 Opposing groove 58 Pin hole

Claims (1)

A fixture for connecting one member (41) and the other member (51 or 52) that are adjacent to each other, consisting of a hanging piece (11 or 12), a fulcrum pin (21), and a locking pin (38),
One end of the hanging piece (11 or 12) is provided with a center hole (17) into which the fulcrum pin (21) is inserted, and the other end of the hanging piece (11 or 12) is provided with a center hole (17) for inserting the fulcrum pin (21). A connecting portion (18 or 19) into which the locking pin (38) fits is provided;
The hanging piece (11 or 12) is accommodated in an internal space consisting of a housing groove (46) on the one member (41) side and a facing groove (56) on the other member (51 or 52) side, and The hanging piece (11 or 12) can be entirely accommodated in the accommodation groove (46),
By inserting the fulcrum pin (21) from the surface of the one member (41) toward the center hole (17) while the hanging piece (11 or 12) is accommodated in the accommodation groove (46), The hanging piece (11 or 12) is rotatable around the fulcrum pin (21),
The locking pin (38) is inserted so as to intersect the opposing groove (56), so that a part of the hanging piece (11 or 12) enters the opposing groove (56), and the locking pin (38) ) fits into the connecting portion (18 or 19), thereby connecting the one member (41) and the other member (51 or 52),
The fulcrum pin (21) has a circular cross section, and a protruding strip (27) that protrudes outward is formed in a section of its side circumferential surface that contacts the center hole (17). ) bites into the inner peripheral surface of the center hole (17), thereby causing the fulcrum pin (21) and the hanging piece (11 or 12) to rotate together.

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