JP7498518B2 - Fasteners, fastening methods and devices - Google Patents

Description

The present invention relates to fasteners, fastening methods and equipment.

Blind rivets have been known as fastening tools for some time. Patent Document 1 discloses a blind rivet that includes a hollow rivet body having a shaft and a flange at one end of the shaft, and a mandrel having an outer diameter that can be inserted into the hollow hole of the rivet body, a shaft longer than the rivet body, and a head at one end of the shaft. To fasten members to be fastened using such a blind rivet, first, the shaft of the mandrel is inserted into the shaft of the rivet body so that the mandrel head is located at the end of the shaft opposite the flange of the rivet body. Next, the rivet body is inserted with the mandrel head at the front until the flange comes into contact with the mounting hole of the member to be fastened. Next, with the rivet body inserted, the mandrel shaft is pulled from the flange side, causing the shaft of the rivet body to expand and buckle, and the mandrel shaft to break, fastening the members to be fastened. By using a blind rivet, the members to be fastened can be fastened from one side.

Japanese Patent Application Laid-Open No. 61-171910

With blind rivets, it is difficult to increase the shape of the rivet body shank after it expands and buckles, i.e., the deformed shape of the rivet body shank, and so the size is limited. If the deformed shape of the rivet body shank is small, there is a problem that when an external force is applied along the axial direction, the rivet body shank will sink into the fastened parts or slip out of the mounting hole in the fastened parts, reducing the fastening strength. On the other hand, in order to increase the deformed shape of the rivet body shank, it is necessary to make the rivet body shank out of a material that is easily deformed or to reduce the thickness of the shank, but in this case the strength of the entire blind rivet will be reduced.
The present invention has been made in consideration of the above-mentioned problems, and has an object to improve fastening strength when fastening using a fastener.

The fastener of the present invention is a fastener for fastening fastened members, and comprises a hollow rivet body having a flange and inserted into a hole in the fastened members, a mandrel inserted into the rivet body, and a reinforcing member arranged between the deformed portion of the rivet body and the fastened members, the reinforcing member having a hole into which the rivet body is inserted and a raised portion around the hole that protrudes in the axial direction of the hole and is capable of elastically deforming along the axial direction of the hole , the raised portion begins to protrude midway in the radial direction of the reinforcing member and gradually increases in height in the direction away from the fastened members as it approaches the hole, and when the hole in the fastened members is viewed from the axial direction, the starting point where the raised portion begins to protrude is outside the outer periphery of the deformed portion after deformation.

The present invention makes it possible to improve the strength of fastening when fastening using a fastener.

FIG. 2 is a diagram showing an example of the configuration of a blind rivet according to the first embodiment. FIG. 13 is a diagram showing an example of fastened members fastened by a blind rivet of a comparative example. 4A to 4C are diagrams for explaining an example of a method for fastening a blind rivet according to the first embodiment. 4A to 4C are diagrams for explaining an example of a method for fastening a blind rivet according to the first embodiment. 4A to 4C are diagrams for explaining an example of a method for fastening a blind rivet according to the first embodiment. 4A to 4C are diagrams for explaining an example of a method for fastening a blind rivet according to the first embodiment. 13A to 13C are diagrams for explaining an example of a method for fastening a blind rivet according to the second embodiment. FIG. 13 is a perspective view showing an example of a workbench according to a fourth embodiment. FIG. 2 is a cross-sectional view showing a part of the workbench.

Hereinafter, a blind rivet as a fastener according to this embodiment will be described with reference to the drawings.
First Embodiment
First, a blind rivet 10 according to a first embodiment will be described.
FIG. 1 is a diagram showing an example of the configuration of a blind rivet 10.
The blind rivet 10 has a rivet body 20 , a mandrel 30 , and a washer 40 .

The rivet body 20 is a hollow cylinder made of metal such as aluminum alloy or iron. The rivet body 20 has a shank 21 and a flange 22. The shank 21 has an internal hole 23 along the axial direction. The approximate center of the shank 21 functions as a deformation portion 24 that expands and buckles when fastening the fastened members. The flange 22 is formed integrally with the shank 21 at the other end of the shank 21.

The mandrel 30 is axially shaped and made of metal such as aluminum alloy or iron. The mandrel 30 has a shaft 31 and a head 32. The shaft 31 can be inserted into the hole 23 of the shaft 21 of the rivet body 20. The length of the shaft 31 is longer than the length of the shaft 21 of the rivet body 20. Therefore, when the shaft 31 of the mandrel 30 is inserted into the hole 23 of the shaft 21 of the rivet body 20, the shaft 31 of the mandrel 30 protrudes from the hole 23. The shaft 31 has a breakage portion 33 at a position biased toward the head 32. The breakage portion 33 is a portion that breaks when the shaft 31 is pulled. The head 32 is formed integrally with the shaft 31 at one end of the shaft 31. The head 32 is larger than the hole 23 of the shaft 21 of the rivet body 20. Therefore, when the shaft 31 of the mandrel 30 is inserted into the hole 23 of the shaft 21 of the rivet body 20, the head 32 abuts against one end of the rivet body 20.

The washer 40 is a plate made of metal such as aluminum alloy or iron. The washer 40 is formed by using a press die, for example. The washer 40 corresponds to an example of a reinforcing member.
The washer 40 in this embodiment is substantially circular. The outer diameter of the washer 40 is set to be larger than the outer diameter of the deformed portion 24 of the rivet body 20 after deformation. The washer 40 also has a hole 41 in approximately the center. The inner diameter of the hole 41 is larger than the outer diameter of the shank 21 of the rivet body 20 and the outer diameter of the head 32 of the mandrel 30. Therefore, the shank 21 of the rivet body 20 can be inserted into the hole 41 of the washer 40.

The washer 40 also has a raised portion 42 in which the periphery of the hole 41 is raised in the axial direction of the hole 41 more than the outer periphery. The raised portion 42 is capable of elastically deforming along the axial direction of the hole 41 when an external force is applied. Here, the raised portion 42 is substantially dome-shaped, and begins to rise midway in the radial direction of the washer 40, gradually increasing in height toward the hole 41.
The washer 40 also has ribs 43. The ribs 43 reinforce the strength of the washer 40 itself or the raised portion 42. The ribs 43 are provided on the raised portion 42 and protrude in the same direction as the raised portion 42. The ribs 43 are formed around the hole 41 in a radial pattern with the hole 41 as the center (for example, 4 to 10 ribs).

Next, the differences between a blind rivet 50 of a comparative example that does not include a washer 40 and the blind rivet 10 of this embodiment that includes a washer 40 will be described.
Figure 2 is a diagram for explaining a fastening method when fastening workpieces with a comparative example blind rivet 50. Figure 2 shows the blind rivet 50 before fastening, and a first member 60 and a second member 62 as the fastened workpieces to be fastened by overlapping them.
The blind rivet 50 comprises a rivet body 20 and a mandrel 30 .

The first member 60 is, for example, a flat plate or a partially flat plate, and has a hole 61 through which the blind rivet 50 is inserted. The second member 62 is, for example, a hollow member such as a pipe, and has a hole 63 through which the blind rivet 50 is inserted. Here, the second member 62 is a member in which the inside is a closed or nearly closed space, and the worker who fastens the second member 62 cannot access the inside of the second member 62. Therefore, when fastening such a second member 62 in a state where it is superimposed on the first member 60, it is difficult to fasten it using, for example, bolts and nuts that require access to the inside of the second member 62, and fastening using the blind rivet 10 of this embodiment in which the washer 40 is placed from the second member 62 side as described later, and it is preferable to fasten it using a blind rivet 50 that does not have a washer 40 and can be fastened only from the first member 60 side.

3A to 3D are diagrams for explaining the fastening method when fastening workpieces with the blind rivet 10 of this embodiment. Figure 3A shows the blind rivet 10 before fastening, and a first member 70 and a second member 72 as the fastened workpieces to be fastened by overlapping them.
The first member 70 is, for example, a flat plate or a partially flat plate, and has a hole 71 through which the blind rivet 10 is inserted. The second member 72 is, for example, a flat plate or a partially flat plate, and has a hole 73 through which the blind rivet 10 is inserted. Here, the second member 72 for fastening the blind rivet 10 of this embodiment is not blocked, and the configuration allows the worker to access the second member 72 side. Specifically, the configuration allows the washer 40 to be placed in the hole 73 of the second member 72 from the second member 72 side. In the configuration of the first member 70 and the second member 72 shown in Fig. 3A, it is common to fasten them using inexpensive bolts and nuts, but in this embodiment, taking into consideration the advantages of improved work efficiency and no need for torque management, the blind rivet 10 equipped with the washer 40 is used for fastening.

A fastening method for fastening workpieces with the blind rivet 10 of this embodiment will be described below with reference to Figures 3A to 3D.
First, in the first step, as shown in Figure 3A, the rivet body 20 and mandrel 30 of the blind rivet 10 are assembled. Specifically, the worker inserts the shank 31 of the mandrel 30 into the hole 23 of the rivet body 20 from the opposite side to the flange 22, causing the shank 31 of the mandrel 30 to protrude from the hole 23. At this time, the washer 40 of the blind rivet 10 is not assembled to the rivet body 20 but is left separate. Note that if the rivet body 20 and mandrel 30 have already been assembled and held in place, the first step can be omitted.

In the second step, as shown in FIG. 3B, the assembled rivet body 20 and mandrel 30 are inserted into the hole 71 of the first member 70 and the hole 73 of the second member 72. Specifically, the worker inserts the rivet body 20 from the first member 70 side, with the head 32 of the mandrel 30 at the front, into the hole 71 of the first member 70 and the hole 73 of the second member 72. The worker inserts the rivet body 20 until the flange 22 of the rivet body 20 abuts against the first member 70.

As a third step, as shown in FIG. 3B, the shaft 21 of the rivet body 20 is inserted into the hole 41 of the washer 40. Specifically, the worker accesses the second member 72 side and slides the washer 40 toward the second member 72 while inserting the shaft 21 of the rivet body 20 into the hole 41 of the washer 40. The worker slides the washer 40 until it abuts against the second member 72. The washer 40 is oriented so that the opposite side of the raised portion 42 faces the second member 72. Therefore, when the washer 40 abuts against the second member 72, the opposite side of the raised portion 42 of the washer 40 faces the second member 72.

As a fourth step, as shown in FIG. 3C, while maintaining the positions of the rivet body 20 and the washer 40, only the mandrel 30 is pulled in the direction of the arrow. Specifically, the worker holds the shank 31 of the mandrel 30 using a fastening tool and pulls it in the direction of the arrow. Here, the force of pulling the mandrel 30 becomes a force that deforms the deformed portion 24 of the shank 21 of the rivet body 20 via the head 32 of the mandrel 30. Therefore, the deformed portion 24 of the shank 21 of the rivet body 20 is deformed so as to expand and buckle. The outer shape of the deformed portion 24 gradually becomes larger each time the shank 31 of the mandrel 30 is pulled. Note that, as shown in FIG. 3C, the washer 40 remains in approximately its original shape during the deformation of the deformed portion 24.

In the fifth step, as shown in FIG. 3D, the mandrel 30 is further pulled in the direction of the arrow. As a result, the deformed portion 24 of the shank 21 of the rivet body 20 expands further and buckles to its limit, so that the deformed portion 24 comes into contact with the raised portion 42 of the washer 40. As shown in FIG. 3D, the first member 70 and the second member 72 are clamped between the deformed portion 24 of the shank 21 and the flange 22, so that the first member 70 and the second member 72 are fastened together. In the state shown in FIG. 3D, the deformed portion 24 is buckled to its limit, and the head 32 of the mandrel 30 cannot be moved back in the direction of the arrow, so that the shank 31 of the mandrel 30 breaks from the breaking portion 33.

The above steps allow the first member 70 and the second member 72 to be fastened together using the blind rivet 10 of this embodiment. In the second step, the worker may access the second member 72 and place the washer 40 on the second member 72 side in advance so that the hole 41 of the washer 40 communicates with the hole 73 of the second member 72. In this case, the worker inserts the rivet body 20 from the first member 70 side into the hole 71 of the first member 70 and the hole 73 of the second member 72, with the head 32 of the mandrel 30 at the front, and at the same time, the shaft 21 of the rivet body 20 is inserted into the hole 41 of the washer 40, so the third step can be omitted.

Next, the fastening structure in which the first member 70 and the second member 72 are fastened together will be described with reference to Figure 3D. In the fastening structure using the blind rivet 10 of this embodiment, the washer 40 is disposed between the deformed portion 24 of the rivet body 20 and the second member 72, thereby improving the strength when fastening using the blind rivet 10.
The function of the washer 40 will now be described.
When fastened using the blind rivet 10, the washer 40 is located between the deformed portion 24 of the rivet body 20 and the second member 72. In this embodiment, as shown in Figure 3D, the outer diameter Dw of the washer 40 is set to be larger than the outer diameter Dd of the deformed portion 24 after deformation. Furthermore, when viewed along the axial direction of the blind rivet 10, the size of the washer 40 is larger than the outer periphery of the deformed portion 24.

Here, assume that an external force is applied to the rivet body 20 of the blind rivet 10, pulling it outwards towards the first member 70. When an external force is applied to the rivet body 20, the deformed portion 24 of the rivet body 20 presses against the second member 72. In this case, in the blind rivet 10 of this embodiment, the deformed portion 24 does not press against the second member 72 directly, but rather the deformed portion 24 presses against the second member 72 via the washer 40. In this way, by pressing against the second member 72 via the washer 40, the force applied when pressing against the second member 72 is dispersed by the wide area of the washer 40. It is therefore possible to prevent deformation such as the washer 40 sinking into the second member 72 or the washer 40 widening the hole 73 of the second member 72, improving the fastening strength of the blind rivet 10.
Thus, according to the blind rivet 10 of this embodiment, since it has a washer 40 arranged between the deformed portion 24 of the rivet body 20 and the second member 72, deformation of the fastened members such as the second member 72 is suppressed, thereby improving the fastening strength of the blind rivet 10.

Furthermore, when the washer 40 is fastened using the blind rivet 10, it is sandwiched between the deformed portion 24 of the rivet body 20 and the second member 72, and elastically deforms to the side opposite to the side where the raised portion 42 of the washer 40 is raised. In the example shown in Fig. 3D, the raised portion 42 of the washer 40 has deformed until it is flattened. When the raised portion 42 of the washer 40 is in a state where it has elastically deformed, the raised portion 42 biases both the deformed portion 24 and the second member 72 in a direction that moves them apart in the axial direction of the blind rivet 10. It is therefore possible to eliminate any gap that may occur between the deformed portion 24 and the second member 72.
Thus, according to the blind rivet 10 of this embodiment, the washer 40 applies a force so that no gap is created between the deformed portion 24 and the second member 72, thereby suppressing the occurrence of rattling and other problems in the fastened members, thereby improving the fastening strength of the blind rivet 10.

In addition, since the washer 40 has multiple ribs 43, the strength of the washer 40 itself can be improved. Furthermore, since the washer 40 has ribs 43, the washer 40 can have the necessary strength even if it is molded from a thin material, and therefore the manufacturing cost of the washer 40 can be reduced. Furthermore, since the ribs 43 are provided on the raised portion 42 of the washer 40, the biasing force of the raised portion 42 can be increased when the washer 40 is sandwiched between the deformed portion 24 of the rivet body 20 and the second member 72.

Second Embodiment
Next, a blind rivet 80 according to a second embodiment will be described. The blind rivet 80 of this embodiment has two washers (a first washer 40a and a second washer 40b), and the other configurations are the same as those of the first embodiment. In this embodiment, the first washer 40a and the second washer 40b have the same configuration as the washer 40 of the first embodiment. Note that the same components as those in the first embodiment are given the same reference numerals and their description will be omitted.
A fastening method for fastening workpieces with the blind rivet 80 of this embodiment will now be described with reference to FIG.
First, in the first step, the rivet body 20 and the mandrel 30 of the blind rivet 80 are assembled together. This step is similar to the first step in the first embodiment.

In the second step, the assembled rivet body 20 and mandrel 30 are inserted into the hole 41 of the first washer 40a. Specifically, the worker inserts the rivet body 20 into the hole 41 of the first washer 40a, starting with the head 32 of the mandrel 30. The first washer 40a is oriented so that the raised portion 42 faces the flange 22. As shown in FIG. 4, the size of the first washer 40a is larger than the outer circumference of the flange 22. If the rivet body 20 and the first washer 40a are assembled and held in place in advance, the second step can be omitted.

In the third step, the rivet body 20 and mandrel 30 are inserted into the hole 71 of the first member 70 and the hole 73 of the second member 72. Specifically, the worker inserts the rivet body 20 from the first member 70 side into the hole 71 of the first member 70 and the hole 73 of the second member 72, with the head 32 of the mandrel 30 at the front. The worker inserts the rivet body 20 until the flange 22 of the rivet body 20 abuts against the first washer 40a, and the first washer 40a abuts against the first member 70.

In the fourth step, the shank 21 of the rivet body 20 is inserted into the hole 41 of the second washer 40b as shown in Fig. 4. This step is similar to the third step in the first embodiment.
In a fifth step, only the mandrel 30 is pulled in the direction of the arrow while maintaining the positions of the rivet body 20, the first washer 40a, and the second washer 40b. This step is the same as the fourth step in the first embodiment.

In the sixth step, the mandrel 30 is further pulled in the direction of the arrow. As a result, the deformed portion 24 of the shaft 21 of the rivet body 20 expands and buckles to its limit, so that the deformed portion 24 comes into contact with the raised portion 42 of the second washer 40b. As the head 32 of the mandrel 30 cannot be moved back in the direction of the arrow, the shaft 31 of the mandrel 30 breaks at the breaking portion 33. At this time, the first washer 40a is sandwiched between the first member 70 and the flange 22, and elastically deforms until the raised portion 42 becomes flat. This step is the same as the fifth step in the first embodiment.

Through the above steps, the blind rivet 80 of this embodiment can be used to fasten the first member 70 and the second member 72. In a fastening structure using the blind rivet 80 of this embodiment, the first washer 40a is disposed between the flange 22 of the rivet body 20 and the first member 70, and the second washer 40b is disposed between the deformed portion 24 of the rivet body 20 and the second member 72, thereby further improving the strength when fastening using the blind rivet 80.
In the present embodiment, the first washer 40a and the second washer 40b have the same configuration. However, the present invention is not limited to this, and the first washer 40a and the second washer 40b may have different configurations.

Third Embodiment
Next, a blind rivet according to a third embodiment will be described. The blind rivet of this embodiment has a configuration in which the second washer 40b of the two washers of the blind rivet 80 of the second embodiment is omitted. Note that a description of the same configuration as the second embodiment will be omitted.
The fastening method for fastening workpieces with the blind rivet of this embodiment will be described below.
In the first step, the rivet body 20 and the mandrel 30 of the blind rivet are assembled together. This step is similar to the first step in the second embodiment.

In a second step, the assembled rivet body 20 and mandrel 30 are inserted into the hole 41 of the first washer 40a. This step is similar to the second step in the second embodiment.
In a third step, the rivet body 20 and the mandrel 30 are inserted into the hole 71 in the first member 70 and the hole 73 in the second member 72. The operator inserts the rivet body 20 until the flange 22 of the rivet body 20 abuts against the first washer 40a, which in turn abuts against the first member 70. This step is similar to the third step in the second embodiment.

In the fourth step, while maintaining the positions of the rivet body 20 and the first washer 40a, only the mandrel 30 is pulled. This step is similar to the fifth step in the second embodiment.
In the fifth step, the mandrel 30 is pulled further. The deformed portion 24 of the shank 21 of the rivet body 20 expands and buckles to the limit, so that the deformed portion 24 comes into contact with the second member 72. Since the head 32 of the mandrel 30 cannot be retracted, the shank 31 of the mandrel 30 breaks at the breaking portion 33. At this time, the first washer 40a is held between the first member 70 and the flange 22, and elastically deforms until the raised portion 42 becomes flat. This step is the same as the sixth step in the second embodiment.

By the above process, the first member 70 and the second member 72 can be fastened together using the blind rivet of this embodiment. In the fastening structure using the blind rivet of this embodiment, the first washer 40a is disposed between the flange 22 of the rivet body 20 and the first member 70, which improves the strength when fastening using the blind rivet.

Fourth Embodiment
Next, a workbench 100 will be described as an example of a tool that uses fastened parts fastened with the blind rivet 10 of the first embodiment. The workbench 100 is used, for example, when a worker works at height at a work site. Note that the same components as those in the first embodiment are appropriately designated by the same reference numerals.
FIG. 5 is a perspective view showing an example of the workbench 100. As shown in FIG.
The workbench 100 includes a top plate 110, an enclosure 120, and main legs 130. The top plate 110 serves as a foothold when a worker works on the workbench 100. The top plate 110 is a plate-like member, and has a rectangular shape that is longer on the main legs 130 side when viewed from above.

The enclosure 120 surrounds the worker while he or she is working on the top plate 110 to prevent the worker from falling off the workbench 100. The enclosure 120 has four support posts 121, a pair of long side bar members 122, and a pair of short side bar members 123. The four support posts 121 are erected at the four corners of the top plate 110 via support brackets 124. The pair of short side bar members 123 can be detached from the support posts 121 to allow the worker to move between the main legs 130 and the top plate 110.

The main legs 130 support the top plate 110 in a horizontal state. The main legs 130 have a first main leg 131 and a second main leg 132. The first main leg 131 and the second main leg 132 are each ladder-shaped and are arranged so that the distance between them increases from the top plate 110 toward the floor surface. The first main leg 131 and the second main leg 132 have the same configuration, and only the first main leg 131 will be described here.
The first main leg 131 has a leg portion 133 a , a leg portion 133 b , a rail member 136 , and a rail bracket 137 .

The legs 133a, 133b are each a member whose upper portion is connected to a corner of the top plate 110 and whose lower portion extends in an approximately vertical direction to the floor surface. The legs 133a, 133b are arranged so that the distance between them increases from the top plate 110 toward the floor surface. The legs 133a, 133b are made of a metal such as an aluminum alloy, and are formed, for example, by extrusion molding. The legs 133a, 133b each have an approximately U-shaped cross section (approximately C-shaped). The legs 133a and 133b are arranged so that the openings 135 described below face each other.

The crosspiece member 136 is bridged between the legs 133a and 133b. The crosspiece member 136 serves as a stepping bar when an operator ascends and descends to the top board 110. The crosspiece member 136 is made of a metal such as an aluminum alloy, and is formed, for example, by extrusion molding. The crosspiece member 136 is hollow. The crosspiece member 136 is fixed to the legs 133a and 133b via crosspiece brackets 137 with a gap between them in the vertical direction so that the operator can ascend and descend easily.
The crosspiece bracket 137 is a member for fixing the crosspiece member 136 to the legs 133a and 133b. The crosspiece bracket 137 is made of a metal such as an aluminum alloy or steel. The crosspiece bracket 137 is generally flat. The crosspiece bracket 137 is fastened to the leg 133a or the leg 133b using the blind rivet 10 described above.

6 is a cross-sectional view taken along line II shown in FIG. 5 and seen from the direction of the arrow.
As described above, the leg portion 133a has a generally U-shaped cross section (generally C-shaped), and has a pair of side plate portions 134. The leg portion 133a also has an opening 135 between the pair of side plate portions 134. The crosspiece brackets 137 are disposed so as to overlap with the outer sides of the pair of side plate portions 134 of the leg portion 133a.
Here, the crosspiece bracket 137 corresponds to the first member 70 in the first embodiment, and is provided with a hole 71. The side plate portion 134 (leg portion 133a) corresponds to the second member 72 in the first embodiment, and is provided with a hole 73.

As shown in Figure 6, the crosspiece bracket 137 and the side plate portion 134 are fastened together using a blind rivet 10. The washer 40 of the blind rivet 10 is disposed between the deformed portion 24 of the rivet body 20 and the side plate portion 134. In other words, when fastening using the blind rivet 10, the worker can access the inside of the side plate portion 134 through the opening 135 and can insert the shank portion 21 of the rivet body 20 into the hole in the washer 40.
In this way, by fastening the crosspiece bracket 137 to the leg 133a with the blind rivet 10, the fastening strength can be improved because the washer 40 is disposed between the deformed portion 24 of the rivet body 20 and the side plate portion 134. Therefore, the strength of the crosspiece member 136 can be improved because the crosspiece member 136 is fixed by the crosspiece bracket 137 fastened to the leg 133a.

Just as the crosspiece bracket 137 and leg 133a are fastened together using the blind rivet 10, the crosspiece bracket 137 and leg 133b are also fastened together using the blind rivet 10. The blind rivet 10 is also used to fasten the support bracket 124 to the leg 133a or leg 133b.
Furthermore, in this embodiment, a case has been described in which the crosspiece member 136 is a hollow member, but if the crosspiece member 136 is not hollow but has a shape that allows access to the inside of the crosspiece member 136, such as a generally U-shaped cross section, the crosspiece bracket 137 and the crosspiece member 136 may be fastened together using the blind rivet 10. From the standpoint of strength, the legs 133a, 133b that are arranged in a generally vertical direction can be shaped to make it easier to access the inside than the crosspiece member 136 that is arranged in a generally horizontal direction, so it is preferable to use the blind rivet 10 when fastening to fastened members that are arranged in a generally vertical direction.

Furthermore, in this embodiment, the case where the blind rivet 10 of the first embodiment is used has been described, but this is not limited to this case, and fastening may also be performed using the blind rivet 80 of the second or third embodiment.
In this way, the strength of the workbench 100 using fastened parts fastened with the blind rivets 10, 80 of the first to third embodiments can be improved. Note that the present invention may also be applied to other devices other than the workbench 100, such as transport carts.

The present invention has been described above using the above-mentioned embodiments, but the present invention is not limited to the above-mentioned embodiments, and modifications and the like are possible within the scope of the present invention, and the respective embodiments may be combined.
In this embodiment, a blind rivet 10 of a type in which the head 32 of the mandrel 30 abuts against the end of the rivet body 20 has been described, but this is not limited to this case. For example, the present invention may be applied to a blind rivet of a type in which the head 32 of the mandrel 30 is pre-inserted into a hole in the rivet body 20 and the head 32 of the mandrel 30 is not exposed from the outside.

Furthermore, in this embodiment, when the blind rivet 10, 80 is viewed along the axial direction, the size of the washer 40 (first washer 40a, second washer 40b) is larger than the outer periphery of the deformed portion 24. However, this is not limited to this case, and it is sufficient that at least a part of the washer 40 is located outside the outer periphery of the deformed portion 24.
Furthermore, in this embodiment, the size of the first washer 40a is larger than the outer periphery of the flange 22 when the blind rivet 80 is viewed along the axial direction. However, this is not limited to this case, and it is sufficient that at least a portion of the first washer 40a is located outside the outer periphery of the flange 22.

In addition, in this embodiment, the washer 40 (first washer 40a, second washer 40b) is described as being substantially circular, but this is not limited to this case, and any shape that can abut against the fastened member may be used, such as a triangle, a rectangle (including a parallelogram, a trapezoid, etc.), a polygon with pentagons or more sides, etc. Note that substantially circular shapes include, for example, an ellipse, an oval, a polygon that approximates a circle, etc.
In addition, in this embodiment, the washer 40 (first washer 40a, second washer 40b) has a circular hole 41, but this is not limited to this case, and the hole may be non-circular or may be a notched hole whose portion extends to the outer periphery of the washer 40.
Further, in this embodiment, the case where the first member 70 and the second member 72 are fastened to each other has been described, but this is not limited to this case, and one member or three or more members may be fastened to each other.

10: Blind rivet 20: Rivet body 21: Shank 22: Flange 30: Mandrel 31: Shank 32: Head 33: Breaking part 40: Washer (reinforcing member) 40a: First washer (reinforcing member) 40b: Second washer (reinforcing member) 41: Hole 42: Raised part 43: Rib 70: First member (fastened member) 71: Hole 72: Second member (fastened member) 73: Hole 80: Blind rivet 100: Work table 133a, 133b: Legs 136: Crosspiece member 137: Crosspiece bracket

Claims (9)

A fastener for fastening workpieces, comprising:
a hollow rivet body having a flange and inserted into a hole in the workpiece;
A mandrel that is inserted into the rivet body;
a reinforcing member disposed between the deformed portion of the rivet body and the fastened member,
The reinforcing member is
a hole into which the rivet body is inserted;
The periphery of the hole has a raised portion that is raised in the axial direction of the hole and is elastically deformable along the axial direction of the hole ,
The raised portion is
The reinforcing member starts to rise from a middle in a radial direction and gradually increases in height in a direction away from the fastened member toward the hole,
When the hole of the fastened member is viewed from the axial direction,
A fastener characterized in that the starting point of the protrusion is outside the outer periphery of the deformed portion after deformation. 2. The fastener of claim 1, wherein said reinforcing member has a plurality of independent ribs around said hole and on said raised portion . When the reinforcing member is a first reinforcing member,
a second reinforcing member disposed between the flange and the fastened member;
3. The fastener according to claim 1, wherein the first reinforcing member and the second reinforcing member have the same configuration. When the hole of the fastened member is viewed from the axial direction,
4. The fastener of claim 3, wherein at least a portion of said second reinforcing member is larger than the outer periphery of said flange. The fastener according to claim 4, characterized in that the starting point of the protuberance of the second reinforcing member is outside the outer periphery of the flange. A fastening method using a fastener for fastening workpieces, comprising the steps of:
The fastener comprises:
a hollow rivet body having a flange;
A mandrel that is inserted into the rivet body;
a reinforcing member disposed between the deformed portion of the rivet body and the fastened member,
The reinforcing member is
a hole into which the rivet body is inserted;
The periphery of the hole has a raised portion that is raised in the axial direction of the hole and is elastically deformable along the axial direction of the hole ,
The raised portion is
The reinforcing member is formed so that it starts to rise from a middle in a radial direction and gradually increases in height in a direction away from the fastened member toward the hole,
a first step of inserting the rivet body with the mandrel inserted into a hole in the fastened members from one side of the fastened members;
a second step of inserting the rivet body into a hole in the reinforcing member on the other side of the fastened members;
and a third step of pulling the mandrel from one side of the fastened members, thereby sandwiching the reinforcing member between the fastened members and a deformed portion of the rivet body on the other side of the fastened members,
When the hole of the reinforcing member after the third step is viewed from the axial direction,
A fastening method, characterized in that the starting point of the protrusion is outside the outer periphery of the deformed portion after deformation. A fastening method using a fastener for fastening workpieces, comprising the steps of:
The fastener comprises:
a hollow rivet body having a flange;
A mandrel that is inserted into the rivet body;
a first reinforcing member disposed between the deformed portion of the rivet body and the fastened member;
a second reinforcing member disposed between the flange and the fastened member,
The first reinforcing member and the second reinforcing member are
a hole into which the rivet body is inserted;
The periphery of the hole has a raised portion that is raised in the axial direction of the hole and is elastically deformable along the axial direction of the hole ,
The raised portion is
The reinforcing member is formed so that it starts to rise from a middle of the radial direction and gradually increases in height in a direction away from the fastened member toward the hole,
a first step of inserting the rivet body with the mandrel inserted into a hole in the second reinforcing member;
a second step of inserting the rivet body inserted into the hole of the second reinforcing member into a hole of the fastened members from one side of the fastened members;
a third step of inserting the rivet body into a hole in the first reinforcing member on the other side of the fastened members;
and a fourth step of pulling the mandrel from one side of the fastened members, so that the second reinforcing member is sandwiched between the flange and the fastened member on one side of the fastened members, and the first reinforcing member is sandwiched between a deformed portion of the rivet body and the fastened member on the other side of the fastened members,
When the hole of the first reinforcing member and the hole of the second reinforcing member after the fourth step are viewed from the axial direction,
A fastening method characterized in that the starting point where the protrusion of the first reinforcing member begins to rise and the starting point where the protrusion of the second reinforcing member begins to rise are outside the outer periphery of the deformed portion after deformation. An apparatus characterized by using a fastening member fastened by the fastener described in any one of claims 1 to 5. The device according to claim 8, characterized in that at least one of the fastened members is arranged in a substantially vertical direction.

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