JP7486806B2 - Brace connecting fittings - Google Patents

Description

The present invention relates to a brace connector that connects a brace bolt, which acts as a diagonal reinforcement, to a suspension bolt.

Conventionally, in structures in which hanging bolts hanging from a ceiling structure such as a ceiling slab support ceiling-suspended items such as air conditioners, brace bolts acting as diagonal reinforcement are connected to positions near the upper and lower ends of the hanging bolts to suppress vibrations during earthquakes. For example, one such brace connecting fitting is disclosed in Patent Document 1.

This conventional brace connecting fitting has an L-shaped first fitting and an L-shaped second fitting arranged inside the first fitting, and is configured to hold a suspension bolt by sandwiching it between the first fitting and the second fitting at a corner portion of the overall L-shape. The brace connecting fitting is provided with a fixing member for fixing the brace bolt on the outside of a pair of extension parts that extend perpendicularly from the corner portion of the first fitting, and the brace bolt is sandwiched and fixed between the pair of extension parts and the fixing member. Specifically, a pair of bolts is attached to both ends of the fixing member, and the brace bolt can be sandwiched and fixed between the fixing member and the extension parts by tightening the pair of bolts.

Patent No. 6635491

However, when attaching the conventional brace connecting fittings described above to a hanging bolt, it is necessary to temporarily remove the bolt connecting the first and second fittings to each other, install the hanging bolt between the first and second fittings, and then reinstall the bolt to connect and secure the first and second fittings to each other. This means that the work of removing the bolt connecting the first and second fittings and reinserting the bolt into the screw hole takes time, resulting in a problem of poor work efficiency.

Furthermore, with conventional brace connecting fittings, when connecting two brace bolts to a hanging bolt, it is necessary to tighten bolts installed in a total of six places. For example, if the object suspended from the ceiling is an air conditioner, hanging bolts are attached to the four corners of the air conditioner, and two brace bolts are placed between each pair of adjacent hanging bolts. Therefore, a total of eight brace connecting fittings are used in the structure supporting one air conditioner. In this case, if tightening bolts in six places is required to attach one brace connecting fitting, then tightening bolts in a total of 48 places is required in the structure supporting one air conditioner, which poses the problem of reduced work efficiency.

The present invention was made to solve the above problems, and aims to provide a brace connector that allows installation work to be performed more efficiently than before.

In order to achieve the above object, firstly, the present invention provides a brace connecting fitting for connecting a brace bolt to a hanging bolt, the brace connecting fitting comprising: a first retaining portion curved to fit along an outer circumferential surface of the hanging bolt; and a pair of first extension portions extending from the first retaining portion in directions forming approximately a right angle to each other in order to connect the brace bolt, the first fitting being an L-shaped first fitting having a bolt insertion hole formed in each of the pair of first extension portions; a fastening bolt having a shaft portion inserted into the bolt insertion hole and a nut attached in advance to a tip of the shaft portion; a biasing member attached to the shaft portion of the fastening bolt outside the pair of first extension portions of the first fitting and biasing the shaft portion of the fastening bolt towards the outside of the pair of first extension portions; a second retaining portion arranged inside the pair of first extension portions of the first fitting and curved to fit along the outer circumferential surface of the hanging bolt; and a pair of second extension portions extending from the second retaining portion in directions forming approximately a right angle to each other; and an L-shaped second fitting having U-shaped notches formed in the up-down direction in each of the two extension portions, wherein when the fastening bolt and the nut are in an unfastened state and an operation of pushing the shank of the fastening bolt toward the inside of the pair of first extension portions against the biasing force of the biasing member is performed, the shank of the fastening bolt protrudes inside the pair of first extension portions, and the second fitting is slid in the up-down direction inside the pair of first extension portions of the first fitting to move the shank of the fastening bolt forward and backward relative to the notches , thereby bringing the second fitting into a first state in which it is detachable from the inside of the pair of first extension portions of the first fitting, and when the pushing operation is released after the second fitting is attached inside the pair of first extension portions of the first fitting, the biasing force of the biasing member brings the second fitting into a second state in which it is temporarily fixed inside the pair of first extension portions of the first fitting .

Secondly, the present invention is characterized in that, in a brace connecting fitting having the above-described first configuration, the first fitting and the second fitting are fixed to the hanging bolt by fastening the fastening bolt and the nut in the second state in which the hanging bolt is sandwiched between the first retaining portion and the second retaining portion.

Thirdly, the present invention is characterized in that, in a brace connecting fitting having the above-mentioned first or second configuration, the inside of the pair of first extension portions of the first fitting has a protrusion that regulates the vertical sliding of the second fitting in the second state in which the second fitting is temporarily fixed to the first fitting.

Fourthly, the present invention provides a brace connecting fitting having any one of the first to third configurations, characterized in that the first fitting has a plurality of bolt insertion holes formed in each of the pair of first extension portions, the fastening bolt is inserted in advance in an unfastened state into each of the plurality of bolt insertion holes, and the second fitting has at least one notch formed at a position corresponding to the shaft of the fastening bolt protruding inside the pair of first extension portions of the first fitting.

Fifth, the present invention provides a brace connecting fitting having any one of the first to fourth configurations, further comprising a brace connecting member that is arranged on the outside of the pair of first extension portions of the first fitting and connects the brace bolt by sandwiching it between the first extension portions, the brace connecting member being held by the fastening bolt, and the brace bolt being fixed between the first extension portions by fastening the fastening bolt and the nut.

Sixth, the present invention provides a brace connecting fitting having the above-mentioned fifth configuration, characterized in that the biasing member is attached to the shank of the fastening bolt between the first extension portion and the brace connecting member, and biases the first extension portion in a direction widening the gap between the brace connecting member.

Seventh, the present invention is a brace connection fitting having the fifth or sixth configuration described above, characterized in that the brace connection member has an engagement protrusion on the surface facing the first extension portion that engages with the outer peripheral surface of the brace bolt.

The brace connector of the present invention can be attached to the suspension bolt without removing the bolt, making installation more efficient than ever before.

FIG. 2 is a perspective view showing a brace connecting fitting in the first embodiment. FIG. 2 is a front perspective view of the brace connecting fitting according to the first embodiment, with each component part disassembled. FIG. 2 is an oblique view of the brace connecting fitting according to the first embodiment, viewed from the rear side, with each component part disassembled. FIG. 13 is a diagram showing an example of an installation mode of a brace connecting fitting. 11A to 11C are diagrams showing a procedure for removing a second fitting from a first fitting in the brace connecting fitting of the first embodiment. 5A to 5C are diagrams showing a procedure for attaching the brace connecting fitting of the first embodiment to a hanging bolt. FIG. 13 is a perspective view showing an example in which a brace bolt is attached to a brace connecting fitting. FIG. 13 is a perspective view showing an example in which a brace bolt is attached to a brace connecting fitting. 13 is a side view showing an example of attaching a brace bolt between a first extension portion and a brace connecting member. FIG. FIG. 11 is a cross-sectional view showing the displacement of a brace connecting member when a brace bolt is fixed. FIG. 11 is a perspective view showing a brace connecting fitting in a second embodiment. FIG. 11 is a perspective view showing a brace connecting fitting 1 in a third embodiment. FIG. 11 is an oblique view of the brace connecting fitting according to the third embodiment, viewed from the front in a disassembled state in which each component part is shown. FIG. 11 is an oblique view of the brace connecting fitting according to the third embodiment, viewed from the rear side in a disassembled state. 13A to 13C are plan views showing a procedure for attaching the second fitting to the first fitting in the third embodiment. 13A to 13C are perspective views showing a procedure for attaching a second fitting to a first fitting in the third embodiment.

Below, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that in the drawings referred to below, the same reference numerals are used to designate common members, and redundant descriptions of those members will be omitted.

First Embodiment
Fig. 1 is a perspective view showing a brace linking device 1 in a first embodiment of the present invention, where (a) shows the brace linking device 1 as viewed from the front side, and (b) shows the brace linking device 1 as viewed from the back side. Fig. 2 is a perspective view showing the brace linking device 1 with each component disassembled, as viewed from the front side. Fig. 3 is a perspective view showing the brace linking device 1 with each component disassembled, as viewed from the back side. Fig. 4 is a side view showing an example of an installation mode of the brace linking device 1.

First, as shown in FIG. 4, the brace connecting fitting 1 of this embodiment is a fitting for connecting a hanging bolt 110 that hangs down from a ceiling structure 100 such as a ceiling slab, and a brace bolt 120 that is disposed diagonally between a pair of hanging bolts 110.

The hanging bolts 110 are bolts that support a ceiling-suspended object 150, such as an air conditioner, while it is suspended in the ceiling space. For example, four hanging bolts 110 are attached to the ceiling structure 100 so that they can be connected to connecting parts 151 provided at the four corners of the ceiling-suspended object 150. The four hanging bolts 110 are connected at their lower ends to the connecting parts 151 at the four corners of the ceiling-suspended object 150, and support the ceiling-suspended object 150 at a predetermined height.

The brace bolt 120 is disposed diagonally between two adjacent suspension bolts 110 among the four suspension bolts 110, with its upper end connected to a position near the upper end of one suspension bolt 110 and its lower end connected to a position near the lower end of the other suspension bolt 110. The arrangement angle of the brace bolt 120 is appropriately adjusted according to the dimension from the ceiling structure 100 to the upper surface of the ceiling-suspended object 150. For example, if the horizontal line is taken as the reference of 0°, the longer the dimension from the ceiling structure 100 to the upper surface of the ceiling-suspended object 150, the larger the arrangement angle of the brace bolt 120 becomes, and conversely, the shorter the dimension from the ceiling structure 100 to the upper surface of the ceiling-suspended object 150, the smaller the arrangement angle of the brace bolt 120 becomes. The brace connecting fitting 1 has a structure that can connect the brace bolts 120 disposed at such various angles to the suspension bolts 110.

Two brace bolts 120 are arranged between two hanging bolts 110 so that they cross each other. Therefore, the brace connecting fitting 1 is attached to two locations at different heights, the top and bottom of one hanging bolt 110, and connects the brace bolt 120 to the hanging bolt 110 at each height. In FIG. 4, the brace connecting fitting 1 attached to the bottom of the hanging bolt 110 is shown as brace connecting fitting 1a, and the brace connecting fitting 1 attached to the top of the hanging bolt 110 is shown as brace connecting fitting 1b. Brace connecting fitting 1a and brace connecting fitting 1b have the same configuration and function, except that they are used upside down.

Next, the brace connection fitting 1 will be described. As shown in Figures 1, 2, and 3, the brace connection fitting 1 has an overall L-shaped configuration bent at a substantially right angle, with a hanging bolt 110 attached to the corner bent at a substantially right angle, and a brace bolt 120 connected to a section extending in two directions from the corner at a substantially right angle to each other. In the following, the substantially right-angled area sandwiched between the sections extending in two directions with the corner part as the center in the L-shaped brace connection fitting 1 will be referred to as the "inside" of the brace connection fitting 1, and the approximately 270-degree area on the opposite side will be referred to as the "outside" of the brace connection fitting 1.

This brace connecting fitting 1 comprises a first fitting 2, a second fitting 3, a fastening bolt 4, a nut 5, a brace connecting member 6, and a biasing member 7. The first fitting 2 is a fitting bent into a roughly L shape. The second fitting 3 is also a fitting bent into a roughly L shape overall. The second fitting 3 is positioned inside the bent portion of the first fitting 2. For example, the outer surface of the second fitting 3 is positioned so as to join to the inner surface of the first fitting 2. Then, when the second fitting 3 is assembled to the first fitting 2, the L-shaped bent corner portion of the brace connecting fitting 1 is attached at a predetermined height position of the hanging bolt 110.

The first metal fitting 2 is an L-shaped metal fitting having a first retaining portion 10 curved to fit the outer peripheral surface of the hanging bolt 110, and a pair of first extension portions 11, 11 extending from the first retaining portion 10 in directions forming approximately right angles with each other to connect the brace bolt 120, with a bolt insertion hole 12 formed in each of the pair of first extension portions 11, 11.

The first holding part 10 is formed at the corner part of the first metal fitting 2 bent into an L shape, and holds the hanging bolt 110 with the inner side of the corner part joined to the outer circumferential surface of the hanging bolt 110. Also, as shown in FIG. 3, the first holding part 10 has an engagement protrusion 14 on the inner side of the corner part that engages with the male screw formed on the outer circumferential surface of the hanging bolt 110. For example, the engagement protrusion 14 is formed by pressing the outer circumferential surface of the L-shaped corner part of the first metal fitting 2 inward to cause the inner surface of the corner part to protrude inward. This engagement protrusion 14 is formed as a linear protrusion along the curved shape of the first holding part 10. Also, the engagement protrusion 14 is inclined in the same direction as the helical inclination direction of the male screw formed on the outer circumferential surface of the hanging bolt 110, and is formed to engage with the screw groove of the hanging bolt 110. Such a first holding part 10 is located in the center of a pair of first extension parts 11, 11, and both ends are smoothly connected to the first extension parts 11, 11.

The pair of first extensions 11, 11 are formed as flat plate portions extending at approximately right angles from the first retaining portion 10. Each of the pair of first extensions 11, 11 extending from the first retaining portion 10 has the same length. In addition, a bolt insertion hole 12 is formed in each of the pair of first extensions 11, 11. For example, two bolt insertion holes 12, 12 are formed in one first extension portion 11. The two bolt insertion holes 12, 12 are formed at different height positions in the first extension portion 11 and at different distances from the first retaining portion 10. Therefore, the two bolt insertion holes 12, 12 are located in an oblique direction in the first extension portion 11. In addition, the two bolt insertion holes 12, 12 formed in each of the pair of first extensions 11 are formed in positions that are symmetrical to each other across the first retaining portion 10. For example, as shown in FIG. 2, in each of the pair of first extensions 11, a bolt insertion hole 12 is formed at a first height position relatively close to the first retaining portion 10, and a bolt insertion hole 12 is formed at a second height position lower than the first height position near the tip position relatively far from the first retaining portion 10. The inner diameter of the bolt insertion hole 12 is formed to be larger than the outer diameter of the shaft portion 4b of the fastening bolt 4.

Furthermore, a protrusion 13 is formed on each of the pair of first extensions 11, 11 below the bolt insertion hole 12 formed in a position relatively close to the first retaining portion 10. This protrusion 13 is formed, for example, by pressing the outer surfaces of the pair of first extensions 11, 11 inward to cause the inner surfaces to protrude. However, this is not limited to this, and the protrusion 13 may also be formed by bending a portion of the lower end of the first extensions 11, 11.

The positional relationship between the bolt insertion hole 12 and the protrusion 13 described above can be reversed by turning the first fitting 2 upside down.

The shaft 4b of the fastening bolt 4 is inserted into the bolt insertion hole 12. At this time, the head 4a of the fastening bolt 4 is disposed inside the pair of first extensions 11, 11, and the shaft 4b is inserted from the inside to the outside of the pair of first extensions 11, 11. In other words, the fastening bolt 4 is inserted into the bolt insertion hole 12 with the tip of the shaft 4b protruding outside the first extension 11. Two bolt insertion holes 12, 12 are formed in one first extension 11, and the fastening bolt 4 is inserted into each of the two bolt insertion holes 12, 12. Therefore, the shafts 4b of the two fastening bolts 4 protrude outside the one first extension 11.

The brace connecting members 6 are arranged one on each of the pair of first extensions 11. The brace connecting members 6 are arranged to face the outer surface of the first extensions 11, and are attached to the shafts 4b of the fastening bolts 4 protruding outward from the first extensions 11. For example, the brace connecting members 6 are made of a rectangular flat metal member, and holes 31 are formed at both ends through which the shafts 4b of the fastening bolts 4 are inserted. The inner diameter of the holes 31 is larger than the outer diameter of the shafts 4b of the fastening bolts 4. The brace connecting members 6 are held so as not to come off the fastening bolts 4 outside the first extensions 11 by attaching nuts 5 to the tips of the shafts 4b of the fastening bolts 4 with the shafts 4b of the two fastening bolts 4 protruding outward from the first extensions 11 inserted into the holes 31 at both ends. In addition, the nuts 5 are attached in advance to the tips of the shafts 4b of the fastening bolts 4 in an unfastened state in which they are not tightly fastened to the shafts 4b of the fastening bolts 4.

The brace connecting member 6 also has a number of protrusions 32 that protrude from the surface facing the outer surface of the first extension portion 11. These protrusions 32 are formed between two holes 31, 31 formed at both ends of the brace connecting member 6. For example, the protrusions 32 are formed so as to press the outer surface of the brace connecting member 6 that does not face the first extension portion 11, thereby causing the surface corresponding to the first extension portion 11 to protrude toward the first extension portion 11. The protrusions 32 engage with the outer peripheral surface (thread groove) of the brace bolt 120 when the brace bolt 120 is sandwiched between the brace connecting member 6 and the first extension portion 11, and serve to regulate the displacement of the brace bolt 120.

The biasing member 7 is formed, for example, of a coil spring. It is attached to the shaft portion 4b of one of the two fastening bolts 4 that hold the brace connecting member 6, and is disposed between the brace connecting member 6 and the first extension portion 11. The biasing member 7 applies a biasing force to the brace connecting member 6 in a direction away from the first extension portion 11 so that the distance between the brace connecting member 6 and the first extension portion 11 is equal to or greater than a predetermined distance.

The second metal fitting 3 is an L-shaped metal fitting having a second retaining portion 20 curved to fit the outer peripheral surface of the hanging bolt 110, and a pair of second extension portions 21, 21 extending from the second retaining portion 20 in directions perpendicular to each other in order to be attached to the inside of the first metal fitting 2, and U-shaped notches 22, 23 are formed in the up-down direction in each of the pair of second extension portions 21, 21.

The second retaining portion 20 is formed at the L-shaped bent corner of the second metal fitting 3, has a curved shape concave toward the inside of the pair of second extension portions 21, 21, and holds the hanging bolt 110 with the outside of the corner portion joined to the outer circumferential surface of the hanging bolt 110. In other words, the second retaining portion 20 holds the hanging bolt 110 by sandwiching it between the first retaining portion 10 of the first metal fitting 2 and the second retaining portion 20. Note that the second retaining portion 20 may be formed with a protrusion similar to the engagement protrusion 14 formed on the first retaining portion 10. Such a second retaining portion 20 is located in the center of the pair of second extension portions 21, 21, and both ends are smoothly connected to the second extension portions 21, 21.

The pair of second extensions 21, 21 are formed as flat plate portions extending at approximately right angles from the second retaining portion 20. The pair of second extensions 21, 21 extending from the second retaining portion 20 are each the same length. The pair of second extensions 21, 21 are arranged, for example, in a position close to the pair of first extensions 11, 11 of the first fitting 2. The notches 22 formed in each of the pair of second extensions 21, 21 have a width on the inside that can accommodate the shaft portion 4b of the fastening bolt 4 inserted into the bolt insertion hole 12 of the first fitting 2. For example, two notches 22, 22 are formed at different positions in one second extension portion 21, 21. The two notches 22, 22 are formed at positions that can accommodate the shaft portions 4b of the two fastening bolts 4 inserted into the first extension portion 11. The two fastening bolts 4 inserted into one first extension 11 are located at different heights in the first extension 11. Therefore, the two notches 22, 22 are formed as notches extending downward from different positions on the upper end of the second extension 21, and are formed so that the depths of the notches are different. Specifically, of the two notches 22, 22 formed in the second extension 21, the notch 22 formed closer to the second retaining portion 20 is shallower, and the notch 22 formed farther from the second retaining portion 20 is deeper. In other words, the end positions of the two notches 22, 22 are located in an oblique direction in the second extension 21. This oblique direction coincides with the oblique direction in which the two fastening bolts 4 are arranged. In addition, the two notches 22, 22 formed in each of the pair of second extensions 21 are formed in positions symmetrical to each other across the second retaining portion 20.

In addition, each of the pair of second extensions 21, 21 is provided with a protrusion 24 that engages with the head 4a of the fastening bolt 4 at a position further below the end position of the notch 22, 22 and restricts the rotation of the fastening bolt 4. This protrusion 24 is formed, for example, by pressing the outer surface of the second extension 21 inward to protrude the inner surface.

Furthermore, each of the pair of second extensions 21, 21 has a notch 23 cut upward from the lower end of the second retaining portion 20 below the notch 22 close to the second retaining portion 20. This notch 23 engages with the protrusion 13 formed on the first extension portion 11 when the second extension portion 21 is joined to the first extension portion 11 of the first fitting 2, and serves to prevent the second fitting 3 from coming off the first fitting 2.

The positional relationship between the notches 22, 23 and the protrusion 24 described above can be reversed by turning the second metal fitting 3 upside down.

When the second fitting 3 configured as described above is placed inside the first fitting 2 as shown in FIG. 1(b), the shaft 4b of the fastening bolt 4 is inserted inside the notch 22. The biasing member 7 arranged on the outside of the pair of first extensions 11 biases the brace connecting member 6 to widen the gap between the first extensions 11, so that the second fitting 3 is temporarily fixed in a state in which it is sandwiched between the head 4a of the fastening bolt 4 and the first extensions 11 by the biasing force of the biasing member 7. When attaching such a brace connecting fitting 1 to the hanging bolt 110, the second fitting 3 is temporarily removed from the first fitting 2, the hanging bolt 110 is attached inside the first retaining portion 10 of the first fitting 2, and then the second fitting 3 is attached to the first fitting 2 again. In this embodiment, the brace connecting fitting 1 can be attached to and detached from the first fitting 2 by sliding the second fitting 3 up and down relative to the first fitting 2, and the second fitting 3 can be easily attached to and detached from the first fitting 2 without removing the fastening bolt 4 from the first fitting 2.

Figure 5 shows the procedure for removing the second fitting 3 from the first fitting 2. First, as shown in Figure 5 (a), the brace connecting fitting 1 is shipped in a temporarily fixed state in which the second fitting 3 is attached inside the first fitting 2. In this temporarily fixed state, as described above, the biasing member 7 biases the brace connecting member 6 in a direction away from the first extension portion 11, and the second fitting 3 is sandwiched between the head 4a of the fastening bolt 4 and the first extension portion 11. In addition, since the protrusion 13 formed on the first extension portion 11 engages with the notch 23 formed on the second extension portion 21, the second fitting 3 cannot be slid downward as it is. In other words, in the temporarily fixed state, the second fitting 3 is not detached from the first fitting 2.

When the second metal fitting 3 is temporarily fixed to the first metal fitting 2 and the second metal fitting 3 is to be removed from the first metal fitting 2, the worker pushes the tip of the shaft 4b of the fastening bolt 4 toward the first extension 11 as shown in FIG. 5(b). For example, the worker holds the tip of the pair of first extensions 11 of the first metal fitting 2 with his right hand and pushes the tip of the shaft 4b of the four fastening bolts 4 toward the pair of first extensions 11 with the palm and fingers of his left hand. As a result, the head 4a of the fastening bolt 4 is separated from the first extension 11 as shown in FIG. 5(b), and the temporary fixing state of the second metal fitting 3 is released. In other words, a gap is created between the head 4a of the fastening bolt 4 and the first extension 11. When such a gap is created, the second metal fitting 3 is in a state in which it can slide downward relative to the first metal fitting 2. Therefore, the worker can remove the second fitting 3 from the first fitting 2 by releasing the engagement between the protrusion 13 and the notch 23 and sliding the second fitting 3 downward, as shown in FIG. 5(c). In other words, when removing the second fitting 3 from the first fitting 2, the worker can remove the second fitting 3 from the first fitting 2 with a single touch without removing the fastening bolt 4 and the nut 5. Therefore, the second fitting 3 can be easily removed from the first fitting 2, improving work efficiency compared to the conventional method.

Next, FIG. 6 shows the procedure for attaching the brace connecting fitting 1 to the hanging bolt 110. FIG. 6 shows the procedure for attaching the brace connecting fitting 1a to the lower part of the hanging bolt 110, among the brace connecting fittings 1a and 1b shown in FIG. 4. First, as shown in FIG. 6(a), the worker attaches the first fitting 2 from which the second fitting 3 has been removed to the hanging bolt 110. That is, the worker attaches the first fitting 2 in a state in which the outer circumferential surface of the hanging bolt 110 is in contact with the inside of the first retaining portion 10 of the first fitting 2. Then, as shown by the arrow F1 in FIG. 6(b), the worker performs an operation to push the tip of the shaft portion 4b of the fastening bolt 4 toward the first extension portion 11, forming a gap between the head portion 4a of the fastening bolt 4 and the first extension portion 11 into which the second fitting 3 can be inserted. Then, as shown in FIG. 6B, the worker slides the second metal fitting 3 from below the first metal fitting 2 upward to insert the second extension portion 21 into the gap between the head 4a of the fastening bolt 4 and the first extension portion 11. At this time, the shaft portion 4b of the fastening bolt 4 is accommodated in the notch portion 22 formed in the second extension portion 21. Then, when the second metal fitting 3 is inserted until the end position of the notch portion 22 abuts against the shaft portion 4b of the fastening bolt 4 and the pushing operation of the shaft portion 4b of the fastening bolt 4 is completed, the brace connecting member 6 moves in a direction away from the first extension portion 11 by the biasing force of the biasing member 7 as shown by the arrow F3 in FIG. 6C, and the second extension portion 21 is temporarily fixed in a state where it is sandwiched between the head 4a of the fastening bolt 4 and the first extension portion 11. At this time, the hanging bolt 110 is temporarily fixed in a state where it is sandwiched between the first holding portion 10 and the second holding portion 20. In other words, the brace connection fitting 1 is temporarily fixed at a specified height position of the hanging bolt 110. In this temporarily fixed state, the engagement protrusion 14 formed on the inside of the first retaining part 10 engages with the screw groove formed on the outer circumferential surface of the hanging bolt 110, so the brace connection fitting 1 is positioned so that it does not move in the vertical direction.

In this way, the brace connecting fitting 1 of this embodiment allows the second fitting 3 to slide up and down while the fastening bolt 4 and nut 5 are left in an unfastened state, ie, not tightly tightened, and allows the second fitting 3 to be easily removed from the first fitting 2 and attached to the first fitting 2.

In the provisionally fastened state shown in FIG. 6(c), the fastening bolt 4 and the nut 5 are not fastened, and the biasing force of the biasing member 7 causes a large gap between the brace connecting member 6 and the first extension portion 11. Therefore, in this provisionally fastened state, the worker can easily insert the brace bolt 120 between the brace connecting member 6 and the first extension portion 11.

Figures 7 and 8 are perspective views showing an example in which the brace bolt 120 is attached with the brace connecting fitting 1 temporarily fixed to the hanging bolt 110. Figure 7 shows the outside of the brace connecting fitting 1 as viewed from above, and Figure 8 shows the outside of the brace connecting fitting 1 as viewed from below. Note that, like Figure 6, Figures 7 and 8 also show an example of a brace connecting fitting 1a attached to the lower part of the hanging bolt 110. When the brace connecting fitting 1 is temporarily fixed to the hanging bolt 110, the brace connecting member 6 is positioned at a predetermined height position of the hanging bolt 110, so that the worker can insert the tip of the brace bolt 120 between the brace connecting member 6 and the first extension portion 11 as shown in Figures 7 and 8, even if the worker is not supporting the brace connecting member 6 with his or her hand.

Figure 9 is a side view showing an example of mounting the brace bolt 120 between the first extension portion 11 and the brace connecting member 6. As shown in Figure 9, the worker inserts the tip of the brace bolt 120 between the two fastening bolts 4, 4 provided at both ends of the brace connecting member 6. As described above, the two fastening bolts 4, 4 are provided at an angled position in the first extension portion 11. In addition, the distance between the two fastening bolts 4, 4 is sufficient to allow the brace bolt 120 to swing at least within a predetermined angle range. Therefore, when the worker inserts the tip of the brace bolt 120 between the two fastening bolts 4, 4, the worker can adjust the arrangement angle of the brace bolt 120 within a predetermined angle range. Figure 9 (b) is a cross-sectional view showing a state in which the brace connecting member 6 is omitted. For example, when the horizontal line L1 is set as the reference of 0°, the two fastening bolts 4, 4 regulate the installation angle θ of the brace bolt 120 to be within the range of 45°±15°, and the brace bolt 120 can be inserted at any angle within that range. This is because the necessary strength cannot be ensured when the installation angle of the brace bolt 120 is less than 30° or exceeds 60°, and the reduction in strength can be suppressed by regulating the installation angle of the brace bolt 120 by the spacing between the two fastening bolts 4, 4. Therefore, when attaching the brace bolt 120 to the brace connecting fitting 1, the worker will not mistakenly place the brace bolt 120 at an angle outside the specified angle range. In other words, the brace connecting fitting 1 has a fail-safe function regarding the installation angle θ of the brace bolt 120.

The brace connecting member 6 as described above is attached to the first extension portion 11 in a state inclined at a predetermined angle α with respect to the vertical direction Z, as shown in FIG. 9(a), for example. This predetermined angle α is preferably set to, for example, about 45 degrees. If the predetermined angle α is set to about 45 degrees, the installation angle θ of the brace bolt 120 can be restricted to within the range of 45 degrees ± 15 degrees even if the brace connecting fitting 1 is turned upside down. However, the predetermined angle α is not necessarily limited to 45 degrees. For example, the predetermined angle α may be within the range of 30 degrees to 60 degrees.

After inserting the brace bolt 120 between the brace connecting member 6 and the first extension 11 and adjusting the installation angle θ to an appropriate angle, the worker tightens the nut 5 using a power tool or the like. As a result, the brace connecting member 6 approaches the first extension 11 against the biasing force of the biasing member 7, and the brace bolt 120 is sandwiched and fixed between the brace connecting member 6 and the first extension 11. At this time, the head 4a of the fastening bolt 4 engages with the protrusion 24 formed on the second extension 21, so that the fastening bolt 4 does not rotate even if a rotational force acts on the nut 5. In addition, since the nut 5 is located on the outside (front side) of the brace connecting member 6, the worker can easily attach a power tool or the like to the nut 5, and can perform the tightening work simply and efficiently.

Figure 10 is a cross-sectional view showing the displacement of the brace connecting member 6 due to the tightening of the nut 5. When the nut 5 is tightened with the brace bolt 120 inserted between the brace connecting member 6 and the first extension portion 11, the brace connecting member 6 is displaced from the state shown in Figure 10 (a) to the state shown in Figure 10 (b). That is, as the nut 5 is tightened, the brace connecting member 6 approaches the first extension portion 11 and presses the outer peripheral surface of the brace bolt 120. When the nut 5 is further tightened, the protrusion 32 formed on the surface of the brace connecting member 6 facing the first extension portion 11 deforms and engages with the outer peripheral surface (thread groove) of the brace bolt 120, as shown in Figure 10 (b). The protrusion 32 deforms and engages with the thread groove of the brace bolt 120, so that the brace bolt 120 is fixed between the brace connecting member 6 and the first extension portion 11. This allows the brace bolt 120 to be connected to the suspension bolt 110 while maintaining the mounting angle θ.

In addition, by tightening the nut 5, the second extension 21 of the second fitting 3 is fixed in a state where it is sandwiched between the head 4a of the fastening bolt 4 and the first extension 11. As a result, the brace connecting fitting 1 is no longer in a temporary fastening state, but is fixed to the hanging bolt 110.

In other words, the brace connecting fitting 1 of this embodiment can be attached to the suspension bolt 110 and connected to the brace bolt 120 simultaneously by tightening a total of four nuts 5 attached to the outside of the pair of first extension portions 11, 11 of the first fitting 2. Therefore, compared to the conventional method in which a total of six bolts must be tightened, since the nuts 5 only need to be tightened in four places, it is possible to reduce the work time to about two-thirds and improve work efficiency.

In addition, in this embodiment, the fastening bolt 4 serves both as a bolt for connecting the brace bolts 120 and a bolt for fixing the second fitting 3 to the first fitting 2 and fixing the brace connecting fitting 1 to the hanging bolt 110. This configuration not only reduces the number of bolts compared to conventional methods, but also makes it possible to position the brace connecting member 6 closer to the hanging bolt 110 than conventional methods. Therefore, the brace connecting fitting 1 can be provided with a fixed position relative to the hanging bolt 110 and a connecting position for the brace bolt 120 closer than conventional methods, which has the advantage of enhancing the reinforcing effect of the brace bolt 120 compared to conventional methods.

As described above, the brace connecting fitting 1 of this embodiment is a fitting for connecting the brace bolt 120 to the hanging bolt 110, and includes the first fitting 2, the fastening bolt 4, and the second fitting 3. The first fitting 2 is an L-shaped fitting having a first retaining portion 10 curved to fit the outer peripheral surface of the hanging bolt 110, and a pair of first extension portions 11, 11 extending from the first retaining portion 10 in directions forming approximately right angles with each other to connect the brace bolt 120, with a bolt insertion hole 12 formed in each of the pair of first extension portions 11, 11. The fastening bolt 4 is a bolt whose shaft portion 4b is inserted into the bolt insertion hole 12 and whose tip is previously fitted with a nut 5. Furthermore, the second fitting 3 is an L-shaped fitting that is disposed inside the pair of first extension portions 11, 11 of the first fitting 2 and has a second retaining portion 20 curved to fit along the outer circumferential surface of the hanging bolt 110, and a pair of second extension portions 21, 21 extended from the second retaining portion 20 in directions forming approximately right angles with each other, and a U-shaped notch portion 22 is formed in each of the pair of second extension portions 21, 21 in the up-down direction. In this configuration, when the fastening bolt 4 and the nut 5 are not fastened, the brace connecting fitting 1 is capable of attaching and detaching the second fitting 3 to and from the inside of the pair of first extension portions 11, 11 of the first fitting 2 by sliding the second fitting 3 in the up-down direction inside the pair of first extension portions 11, 11 of the first fitting 2 to move the shaft portion 4b of the fastening bolt 4 forward and backward relative to the notch portion 22. Therefore, with the brace connecting fitting 1 of this embodiment, it is possible to remove the second fitting 3 from the inside of the first fitting 2 without removing the nut 5 that is previously attached to the tip of the shaft portion 4b of the fastening bolt 4, and after the hanging bolt 110 is attached to the inside of the first retaining portion 10, the second fitting 3 can be attached to the inside of the first fitting 2. Since there is no need to remove the fastening bolt 4 when attaching the brace connecting fitting 1 to the hanging bolt 110 as in the conventional method, the work efficiency is superior to that of the conventional method.

The brace connecting hardware 1 of this embodiment is provided with a total of four fastening bolts 4, and when connecting two brace bolts 120 to the hanging bolt 110, it is only necessary to tighten the nuts 5 attached to the four fastening bolts 4. In other words, the number of times the tightening work is performed can be reduced compared to the conventional method, thereby improving work efficiency.

In the above, the brace connector 1 is mainly attached to the lower part of the hanging bolt 110, but if you want to attach it to the upper part of the hanging bolt 110, you can simply turn it upside down.

Second Embodiment
Next, a second embodiment of the present invention will be described. Fig. 11 is a perspective view showing a brace connection fitting 1 in the second embodiment of the present invention, in which (a) shows the brace connection fitting 1 as viewed from the front side, and (b) shows the brace connection fitting 1 as viewed from the back side.

In the brace connecting fitting 1 of this embodiment, the pair of second extensions 21, 21 of the second fitting 3 are formed shorter than those of the first embodiment. That is, a notch 22 is formed in each of the pair of second extensions 21, 21 of the second fitting 3 to accommodate the shaft 4b of the fastening bolt 4. This notch 22 is for accommodating the shaft 4b of the fastening bolt 4 located closer to the first retaining portion 10 of the two fastening bolts 4 provided in the first extension portion 11. Therefore, in this embodiment, by performing an operation of pushing the tip of the shaft 4b of the two fastening bolts 4 located closer to the first retaining portion 10 of the total four fastening bolts 4 toward the first extension portion 11, the second fitting 3 can be slid vertically relative to the first fitting 2, and the second fitting 3 can be attached and detached to the inside of the first fitting 2.

Therefore, the brace connecting fitting 1 of this embodiment has the advantage that the second fitting 3 can be made smaller and lighter than in the first embodiment.

All other aspects of the brace connector 1 of this embodiment are the same as those described in the first embodiment.

Third Embodiment
Next, a third embodiment of the present invention will be described. Fig. 12 is a perspective view showing a brace connection fitting 1 in the third embodiment of the present invention, where (a) shows the brace connection fitting 1 as viewed from the front side, and (b) shows the brace connection fitting 1 as viewed from the back side. Fig. 13 is a perspective view showing the brace connection fitting 1 in a disassembled state, as viewed from the front side. Fig. 14 is a perspective view showing the brace connection fitting 1 in a disassembled state, as viewed from the back side.

This brace connecting fitting 1 comprises a first fitting 2, a second fitting 3, a fastening bolt 4, a nut 5, a brace connecting member 6, and a biasing member 7. The first fitting 2 is a fitting bent into a roughly L shape. The second fitting 3 is also a fitting bent into a roughly L shape overall. The second fitting 3 is positioned inside the bent portion of the first fitting 2. For example, the outer surface of the second fitting 3 is positioned so as to join to the inner surface of the first fitting 2. Then, when the second fitting 3 is assembled to the first fitting 2, the L-shaped bent corner portion of the brace connecting fitting 1 is attached at a predetermined height position of the hanging bolt 110.

The first fitting 2 is an L-shaped fitting having a first retaining portion 10 curved to fit the outer peripheral surface of the hanging bolt 110, and a pair of first extension portions 11, 11 extending from the first retaining portion 10 in directions forming approximately right angles with each other to connect the brace bolt 120, with a bolt insertion hole 12 formed in each of the pair of first extension portions 11, 11. In this embodiment, the bolt insertion hole 12 is a screw hole 15 formed with a female screw that screws into the male screw of the shaft portion 4b of the fastening bolt 4. In other words, all of the total four bolt insertion holes 12 provided in the first fitting 2 are formed as screw holes 15.

The shaft 4b of the fastening bolt 4 is inserted into these bolt insertion holes 12. For example, in the two bolt insertion holes 12 located near the first retaining portion 10, the head 4a of the fastening bolt 4 is placed inside the first fitting 2, and the shaft 4b is inserted from the inside to the outside of the first fitting 2. The shaft 4b protruding outward from the pair of first extension portions 11, 11 of the first fitting 2 is inserted into one hole 31 of the brace connecting member 6, and a nut 5 is attached to the tip of the shaft 4b. In addition, in the two bolt insertion holes 12 located far from the first retaining portion 10, the head 4a of the fastening bolt 4 is placed outside the first fitting 2, and the shaft 4b is inserted from the outside to the inside of the first fitting 2. At this time, the shaft 4b is inserted into the other hole 31 of the brace connecting member 6, and a biasing member 7 composed of a coil spring or the like is attached between the brace connecting member 6 and the first extension portion 11.

The second metal fitting 3 is an L-shaped metal fitting having a second retaining portion 20 curved to fit the outer peripheral surface of the hanging bolt 110, and a pair of second extension portions 21, 21 extending from the second retaining portion 20 in directions perpendicular to each other in order to be attached to the inside of the first metal fitting 2, and a U-shaped notch 22 is formed in the up-down direction in each of the pair of second extension portions 21, 21.

The second retaining portion 20 is formed at the L-shaped bent corner of the second metal fitting 3, has a curved shape that is concave toward the inside of the pair of second extension portions 21, 21, and retains the hanging bolt 110 with the outside of the corner portion joined to the outer circumferential surface of the hanging bolt 110.

The pair of second extensions 21, 21 are formed as flat plate portions extending at approximately right angles from the second retaining portion 20. The pair of second extensions 21, 21 extending from the second retaining portion 20 are each the same length. The pair of second extensions 21, 21 are arranged, for example, in a position close to the pair of first extensions 11, 11 of the first fitting 2. The notch 22 formed in each of the pair of second extensions 21, 21 has a width on the inside that can accommodate the shaft 4b of the fastening bolt 4 inserted into the bolt insertion hole 12 located close to the first retaining portion 10 of the first fitting 2.

When the second fitting 3 configured as described above is placed inside the first fitting 2 as shown in FIG. 12(b), the shaft 4b of the fastening bolt 4 located near the first retaining portion 10 is inserted inside the notch 22. When the head 4a of the fastening bolt 4 located near the first retaining portion 10 is loosened, the second fitting 3 becomes slidable in the vertical direction relative to the first fitting 2, and conversely, when the head 4a of the fastening bolt 4 located near the first retaining portion 10 is tightened, the second fitting 3 is fixed in a state where it cannot slide relative to the first fitting 2. That is, when removing the second fitting 3 from the first fitting 2, the brace connecting fitting 1 of this embodiment requires that the fastening bolt 4 located near the first retaining portion 10 be loosened. However, it is not necessary to completely remove the fastening bolt 4 from the first fitting 2. In addition, when attaching the second fitting 3 removed from the first fitting 2 to the first fitting 2, the brace connecting fitting 1 of this embodiment requires that the fastening bolt 4 be loosened in advance.

15 and 16 are diagrams showing the procedure for attaching the second fitting 3 to the first fitting 2. First, as shown in FIG. 15(a) and FIG. 16(a), the second fitting 3 is removed from the first fitting 2, and the hanging bolt 110 is attached to the first holding portion 10 of the first fitting 2. That is, the worker attaches the hanging bolt 110 in a state in which the outer circumferential surface of the hanging bolt 110 is in contact with the inside of the first holding portion 10 of the first fitting 2. Then, as shown in FIG. 15(b) and FIG. 16(b), the worker attaches the second fitting 3 to the gap D formed between the head 4a of the fastening bolt 4 and the first extension portion 11 in a state in which the fastening bolt 4 located near the first holding portion 10 of the first fitting 2 is loosened. That is, the worker slides the second fitting 3 from below to above the first fitting 2, thereby inserting the second extension portion 21 into the gap D between the head 4a of the fastening bolt 4 and the first extension portion 11. At this time, the shaft 4b of the fastening bolt 4 is accommodated in the notch 22 formed in the second extension 21. The worker then inserts the second metal fitting 3 until the end position of the notch 22 abuts against the shaft 4b of the fastening bolt 4, and then tightens the head 4a of the fastening bolt 4 using a power tool or the like. As a result, the brace connecting fitting 1 is fixed in a predetermined position on the hanging bolt 110, as shown in Figures 15(c) and 16(c).

In this way, the brace connecting fitting 1 of this embodiment allows the second fitting 3 to slide up and down while the fastening bolts 4 are left in an unfastened state, ie, not tightly tightened, and the second fitting 3 can be easily removed from the first fitting 2 and the second fitting 3 can be easily attached to the first fitting 2.

In the state shown in FIG. 15(c) and FIG. 16(c), the nut 5 is in an untightened state, and the biasing force of the biasing member 7 causes a large gap between the brace connecting member 6 and the first extension portion 11. Therefore, in this untightened state, the worker can easily insert the brace bolt 120 between the brace connecting member 6 and the first extension portion 11.

The manner in which the brace bolt 120 is attached to the brace connecting fitting 1 is the same as that described in the first embodiment. However, in this embodiment, when fixing the brace bolt 120 to the brace connecting fitting 1, the worker tightens the nut 5 and the head 4a of the fastening bolt 4 located far from the first retaining portion 10. By tightening these, the brace bolt 120 is fixed in a state where it is sandwiched between the brace connecting member 6 and the first extension portion 11.

As described above, the brace connecting fitting 1 of this embodiment is a fitting for connecting the brace bolt 120 to the hanging bolt 110, similar to the first embodiment, and includes a first fitting 2, a fastening bolt 4, and a second fitting 3. The first fitting 2 is an L-shaped fitting having a first retaining portion 10 curved to fit the outer peripheral surface of the hanging bolt 110, and a pair of first extension portions 11, 11 extending from the first retaining portion 10 in directions forming approximately right angles with each other to connect the brace bolt 120, and a bolt insertion hole 12 formed in each of the pair of first extension portions 11, 11. The fastening bolt 4 is a bolt whose shaft portion 4b is inserted into the bolt insertion hole 12 and whose tip end is previously fitted with a nut 5. Furthermore, the second fitting 3 is an L-shaped fitting that is disposed inside the pair of first extension portions 11, 11 of the first fitting 2 and has a second retaining portion 20 curved to fit along the outer circumferential surface of the hanging bolt 110, and a pair of second extension portions 21, 21 extended from the second retaining portion 20 in directions forming approximately right angles with each other, and a U-shaped notch portion 22 is formed in each of the pair of second extension portions 21, 21 in the up-down direction. In this configuration, when the fastening bolt 4 and the nut 5 are not fastened, the brace connecting fitting 1 is capable of attaching and detaching the second fitting 3 to and from the inside of the pair of first extension portions 11, 11 of the first fitting 2 by sliding the second fitting 3 in the up-down direction inside the pair of first extension portions 11, 11 of the first fitting 2 to move the shaft portion 4b of the fastening bolt 4 forward and backward relative to the notch portion 22. Therefore, with the brace connecting fitting 1 of this embodiment, it is possible to remove the second fitting 3 from the inside of the first fitting 2 without removing the fastening bolt 4 from the first fitting 2, and after attaching the hanging bolt 110 to the inside of the first retaining part 10, the second fitting 3 can be attached again to the inside of the first fitting 2. Since there is no need to remove the fastening bolt 4 when attaching the brace connecting fitting 1 to the hanging bolt 110 as in the conventional method, the work efficiency is superior to that of the conventional method.

All other aspects of the brace connector 1 of this embodiment are the same as those described in the first or second embodiment.

(Modification)
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to those described in the above embodiments. In other words, the present invention includes those in which various modifications are applied to those described in the above embodiments.

For example, in the above embodiment, the brace connecting member 6 is attached diagonally to the pair of first extension portions 11, 11 of the first fitting 2. However, this is not limited to the above, and the brace connecting member 6 may be attached vertically parallel to the hanging bolt 110, or may be attached horizontally. In this case, the same structure will be obtained even if the brace connecting fitting 1 is turned upside down. Therefore, the worker does not need to be concerned about the orientation (posture) of the brace connecting fitting 1, regardless of whether it is attached to the top or bottom of the hanging bolt 110.

1 (1a, 1b)...brace connecting fitting, 2...first fitting, 3...second fitting, 4...fastening bolt, 5...nut, 6...brace connecting member, 7...biasing member, 10...first retaining portion, 11...first extension portion, 12...bolt insertion hole, 13...projection portion, 14...engagement projection, 20...first retaining portion, 21...second extension portion, 22...notch portion, 23...notch portion, 31...hole, 32...projection portion (engagement projection), 110...suspension bolt, 120...brace bolt.

Claims (7)

A brace connecting fitting for connecting a brace bolt to a suspension bolt,
a first L-shaped fitting including a first retaining portion curved to fit the outer peripheral surface of the hanging bolt and a pair of first extension portions extending from the first retaining portion in directions forming a substantially right angle with each other in order to connect the brace bolt, and a bolt insertion hole formed in each of the pair of first extension portions;
a fastening bolt having a shaft portion inserted into the bolt insertion hole and a nut attached to a tip of the shaft portion in advance;
a biasing member that is attached to a shaft portion of the fastening bolt on the outer sides of the pair of first extension portions of the first fitting and biases the shaft portion of the fastening bolt toward the outer sides of the pair of first extension portions;
an L-shaped second metal fitting having a second retaining portion that is arranged inside the pair of first extension portions of the first metal fitting and curved to fit along an outer peripheral surface of the hanging bolt, and a pair of second extension portions that extend from the second retaining portion in directions that form approximately a right angle with each other, and a U-shaped notch portion formed in the up-down direction in each of the pair of second extension portions;
Equipped with
When the fastening bolt and the nut are in an unfastened state and an operation is performed to push the shank of the fastening bolt toward the inside of the pair of first extension portions against the biasing force of the biasing member, the shank of the fastening bolt protrudes inside the pair of first extension portions, and the second fitting is slid in the vertical direction inside the pair of first extension portions of the first fitting to move the shank of the fastening bolt forward and backward relative to the notch, thereby bringing the second fitting into a first state in which it can be attached and detached to the inside of the pair of first extension portions of the first fitting,
When the pushing operation is released after the second fitting is attached to the inside of the pair of first extension portions of the first fitting, the second fitting is temporarily fixed to the inside of the pair of first extension portions of the first fitting by the biasing force of the biasing member, resulting in a second state . The brace connecting fitting according to claim 1, characterized in that the first fitting and the second fitting are fixed to the hanging bolt by fastening the fastening bolt and the nut in the second state in which the hanging bolt is sandwiched between the first retaining portion and the second retaining portion. The brace connecting fitting according to claim 1 or 2, characterized in that the first fitting has a protrusion on the inside of the pair of first extension portions that restricts the vertical sliding of the second fitting in the second state in which the second fitting is temporarily fastened to the first fitting. the first fitting has a plurality of bolt insertion holes formed in each of the pair of first extension portions, and the fastening bolts are inserted in advance in an unfastened state into each of the plurality of bolt insertion holes,
4. The brace connecting fitting according to any one of claims 1 to 3, characterized in that at least one of the notches is formed in the second fitting at a position corresponding to the shank of the fastening bolt protruding inside the pair of first extension portions of the first fitting. a brace connecting member that is disposed on the outer side of the pair of first extension portions of the first metal fitting and that connects the brace bolt by sandwiching it between the brace connecting member and the first extension portions;
Further comprising:
The brace connecting member is held by the fastening bolt, and the brace bolt is fixed between the brace connecting member and the first extension portion by fastening the fastening bolt and the nut. The brace connecting fitting according to claim 5, characterized in that the biasing member is attached to a shaft portion of the fastening bolt between the first extension portion and the brace connecting member, and biases the fastening bolt in a direction to widen the gap between the first extension portion and the brace connecting member. The brace connecting hardware according to claim 5 or 6, characterized in that the brace connecting member has an engagement protrusion on the surface facing the first extension portion that engages with the outer peripheral surface of the brace bolt.

Images