JP7499504B2 - Riveter and rivet holder - Google Patents

Description

The present invention relates to a riveter and a rivet holder that is replaceable on the riveter.

Conventional riveters are equipped with a replaceable rivet holding part that is attached to the tip of the main body and holds a blind rivet. This rivet holding part has a jaw, a jaw case, a casing that covers the jaw case, and a nosepiece that is detachably attached to the tip of the casing. In particular, in order to hold a blind rivet that has a mandrel with a large shaft diameter with the rivet holding part, a nosepiece (a nozzle in Patent Document 1) that matches the shaft diameter of the mandrel is attached to the tip of the casing (Patent Document 1).

Patent No. 4834418

In the riveter of Patent Document 1, the jaws are pushed backwards with the nosepiece to increase the inner diameter of the jaws, allowing the jaws to hold mandrels with large shank diameters. However, because the jaws move backwards in a riveter with this configuration, they can only be used with blind rivets that have a long mandrel shank.

The present invention aims to provide a riveter that can use blind rivets with a mandrel axial length that is shorter than conventional ones, and a rivet holder that can be installed on the riveter in a replaceable manner.

The riveter of the present invention comprises a main body and a rivet holding part that is replaceably attached to the tip of the main body and holds a blind rivet, the rivet holding part comprises a jaw, a jaw case, and an outer case, the jaw is configured to be able to insert and hold the mandrel of the blind rivet, and is biased towards the tip by the biasing force of a biasing means provided within the outer case, the jaw case is configured so that the jaw can be installed at the tip and the inner surface of the tip is tapered towards the tip, the outer case is a cylindrical body configured to exteriorly house the jaw case, and the mandrel of the blind rivet The rivet holder has a through hole at its tip with a diameter dimension corresponding to the shank diameter of the blind rivet, and the outer case of each of the multiple replaceable rivet holders is configured with the same shape except for the through hole, and the jaw is abutted against the inner surface of the tip side of the rivet holder by the biasing force from the biasing means until the blind rivet is held in the rivet holder, and each of the multiple replaceable rivet holders has a diameter dimension of the tip opening in the jaw case that corresponds to the shank diameter of the mandrel of the blind rivet to be used, or a radial thickness dimension of the jaw that corresponds to the shank diameter of the mandrel of the blind rivet to be used.

According to this configuration, the diameter dimension of the tip opening in the jaw case corresponds to the shaft diameter of the mandrel of the blind rivet to be used, and the inner diameter of the jaw housed in the jaw case corresponds to the shaft diameter of the mandrel. As a result, the jaw is abutted against the inner surface of the tip side of the rivet holding part by the biasing force of the biasing means provided in the outer case until the blind rivet is held in the rivet holding part, so the jaw does not move backward to accommodate a mandrel with a large shaft diameter, as in the case of attaching a conventional nosepiece. Therefore, even if the axial length of the mandrel is shortened compared to the conventional case, a large diameter mandrel can be clamped by the jaw. In addition, the radial thickness dimension of the jaw corresponds to the shaft diameter of the mandrel of the blind rivet to be used, and the inner diameter of the jaw housed in the jaw case corresponds to the shaft diameter of the mandrel. As a result, the jaws are in contact with the inner surface of the tip of the rivet holding portion due to the biasing force from the biasing means until the blind rivet is held in the rivet holding portion, so the jaws do not move backward to accommodate a mandrel with a larger shaft diameter, as would be the case if a conventional nosepiece were attached. Therefore, even if the axial length of the mandrel is shorter than before, a large diameter mandrel can be clamped by the jaws.

The riveter of the present invention may also have an exterior case formed from a single material.

As mentioned above, if the exterior case is made of a single material, this is advantageous in the manufacturing process.

The riveter of the present invention may also have an outer case in which the hardness around the through hole is greater than the hardness of other parts.

As described above, if the hardness of the outer case is greater around the through hole than the hardness of other parts, early damage to the area around the through hole can be suppressed even if the jaw is abutted against the inner surface of the tip side of the rivet holding part by the biasing force of the biasing means provided inside the outer case.

The riveter of the present invention may also be configured so that the axial dimensions of the jaws of each of the multiple replaceable rivet holders are the same.

As described above, if the axial dimensions of the jaws of each of the multiple replaceable rivet holders are the same, the shape of the outer case can be made the same except for the through holes. In addition, the axial lengths of mandrels with different diameters can be made the same.

The rivet holding part of the present invention is replaceably provided at the tip of the main body of the riveter, and is a rivet holding part that includes a jaw, a jaw case, and an outer case to hold a blind rivet when attached to the main body, the jaw is configured to be able to clamp the mandrel of the blind rivet by inserting it therein, and is biased toward the tip by the biasing force of a biasing means provided in the outer case, the jaw case is configured so that the jaw can be installed in the tip, and the inner circumferential surface of the tip is tapered toward the tip, and the outer case is a cylindrical body configured to exteriorly house the jaw case, and the blind rivet The outer case of each of the replaceable rivet holding parts has a through hole at the tip with a diameter corresponding to the shaft diameter of the mandrel, and the other parts except for the through hole are configured to have the same shape, and the jaw is abutted against the inner surface of the tip side of the rivet holding part by the biasing force from the biasing means until the blind rivet is held by the rivet holding part, and each of the replaceable rivet holding parts has a diameter dimension of the tip opening of the jaw case that corresponds to the shaft diameter of the mandrel of the blind rivet to be used, or a radial thickness dimension of the jaw that corresponds to the shaft diameter of the mandrel of the blind rivet to be used.

According to this configuration, the diameter dimension of the tip opening in the jaw case corresponds to the axial diameter of the mandrel of the blind rivet to be used, and the inner diameter of the jaw housed in the jaw case corresponds to the axial diameter of the mandrel. As a result, the jaw is abutted against the inner surface of the tip side of the rivet holding part by the biasing force of the biasing means provided in the outer case until the blind rivet is held in the rivet holding part, so the jaw does not move backward to accommodate a mandrel with a large axial diameter, as in the case of a conventional nosepiece being attached. Therefore, even if the axial length of the mandrel is shortened compared to the conventional case, a large diameter mandrel can be clamped by the jaw. In addition, the radial thickness dimension of the jaw corresponds to the axial diameter of the mandrel of the blind rivet to be used, and the inner diameter of the jaw housed in the jaw case corresponds to the axial diameter of the mandrel. As a result, the jaws are in contact with the inner surface of the tip of the rivet holding portion due to the biasing force from the biasing means until the blind rivet is held in the rivet holding portion, so the jaws do not move backward to accommodate a mandrel with a larger shaft diameter, as would be the case if a conventional nosepiece were attached. Therefore, even if the axial length of the mandrel is shorter than before, a large diameter mandrel can be clamped by the jaws.

As a result, the diameter dimension of the tip opening of the jaw case corresponds to the axial diameter of the mandrel of the blind rivet being used, or the radial thickness dimension of the jaw corresponds to the axial diameter of the mandrel of the blind rivet being used, making it possible to provide a riveter that can use blind rivets with a mandrel axial length that is shorter than conventional ones, and a rivet holding part that can be installed interchangeably on the riveter.

FIG. 2 is a vertical sectional side view of the riveter according to the embodiment. FIG. 2 is an enlarged view of a main part of FIG. 1 . 3A and 3B show a rivet holding portion for holding a large diameter mandrel, in which FIG. 3A shows a conventional example and FIG. 3B shows the present invention. 3A and 3B show a rivet holding portion for holding a small diameter mandrel, in which (a) shows a conventional example and (b) shows the present invention.

One embodiment of the present invention will be described below with reference to the drawings.

As shown in Figures 1 and 2, the riveter according to this embodiment is an air riveter that is operated by an operator holding a handle portion 1 in his/her hand, and includes a main body 2 attached to the upper end of the handle portion 1 so as to extend in the front-rear direction, a hydraulic oil supply means 3 attached to the lower end of the handle portion 1 so as to extend downward, and a rivet holding portion 5 that is replaceably provided at the tip of the main body 2 and holds a blind rivet 4. As shown in Figure 3, the blind rivet 4 includes a rivet body 4A for fastening materials to be fastened, such as steel plates, and a mandrel (shaft) 4B inserted into the rivet body 4A. Various types of blind rivets 4 other than those shown in the figures can be used.

The rivet holding part 5 has a jaw 6, a jaw case 7, and an outer case 8 to hold the mandrel 4B of the blind rivet 4 when attached to the main body 2. A plurality of rivet holding parts 5 are prepared to accommodate blind rivets of different diameters (having mandrels), and one selected from the plurality is attached to the main body 2. In this embodiment, a female screw portion 8N is formed on one of the rear end of the outer case 8 of the rivet holding part 5 and the front end of the main body 2, and a male screw portion 2A that can be screwed and released into the female screw portion 8N is provided on the other side, but a locking portion that can be locked and released from a locked portion provided on one side may be provided on the other side, and the structure for attaching and detaching the rivet holding part 5 to the main body 2 may be other structures.

The jaw 6 has an inner diameter slightly larger than the diameter of the mandrel 4B of the blind rivet 4, and is composed of a pair of split bodies 6A, 6A formed by splitting a truncated cone along its axis, with a through hole on its axial line and with an anti-slip inner surface. The pair of split bodies 6A, 6A are configured so that the mandrel 4B can be inserted and clamped, and are biased toward the tip side by the biasing force of a coil spring 9, which is a biasing means provided in the outer case 8, transmitted via the jaw pusher 10. The coil spring 9 is mounted inside a piston rod 20B, which will be described later.

The jaw case 7 is configured as a cylindrical body in which the jaw 6 can be fitted approximately concentrically to the tip, and the inner peripheral surface of the tip is tapered toward the tip. The jaw 6 is fitted into the jaw case 7 so that the tapered outer peripheral surface of the jaw 6 can slide along this tapered inner peripheral surface.

The outer case 8 is a cylindrical body configured to surround the jaw case 7, and has a through hole 8A at its tip, the diameter of which corresponds to the shaft diameter of the mandrel 4B of the blind rivet 4. The outer cases 8 of the multiple rivet holders 5 all have the same shape, except for the through hole. Furthermore, since they can be made exactly the same shape until the through hole is machined, this is advantageous in the manufacturing process.

Each of the above-mentioned replaceable rivet holders 5 is formed so that the diameter of the tip opening 7A in the jaw case 7 corresponds to the shaft diameter of the mandrel 4B of the blind rivet 4 to be used. Specifically, by making the diameter dimension P1 of the tip opening 7A in the jaw case 7 shown in FIG. 3(b) larger than the diameter dimension P2 of the tip opening 7A in the jaw case 7 shown in FIG. 4(b), the shaft diameter S1 of the mandrel 4B of the blind rivet 4 held by the jaw 6 shown in FIG. 3(b) can be made larger than the shaft diameter S2 of the mandrel 4B of the blind rivet 4 held by the jaw 6 shown in FIG. 4(b). Instead of changing the diameter dimension P2 of the tip opening 7A in the jaw case 7, the radial thickness dimension of the jaw 6 (the vertical dimension shown in FIG. 3(b) and FIG. 4(b)) may be set to correspond to the shaft diameter of the mandrel 4B of the blind rivet 4 to be used.

The diameter dimension P2 of the tip opening 7A in the jaw case 7 corresponds to the shaft diameter S2 of the mandrel 4B of the blind rivet 4 to be used, so that the inner diameter 6a of the jaw 6 housed in the jaw case 7 corresponds to the shaft diameter S2 of the mandrel 4B. As a result, until the mandrel 4B of the blind rivet 4 is held by the rivet holding part 5, the tip of the jaw 6 is abutted against the inner surface of the tip side of the rivet holding part 5 by the biasing force of the coil spring 9, which is a biasing means provided in the outer case 8, so that the jaw 6 does not move backward to accommodate a mandrel with a large shaft diameter, as in the case of a conventional nosepiece being attached. Therefore, even if the axial length of the mandrel 4B is shortened compared to the conventional case, the large diameter mandrel 4B can be clamped by the jaw 6. In addition, the radial thickness dimension of the jaw 6 corresponds to the shaft diameter of the mandrel 4B of the blind rivet 4 to be used, so that the inner diameter of the jaw 6 housed in the jaw case 7 corresponds to the shaft diameter of the mandrel 4B. As a result, until the mandrel 4B of the blind rivet 4 is held by the rivet holding part 5, the jaw 6 is in contact with the inner surface 8B of the tip side of the outer case 8 of the rivet holding part 5 by the biasing force of the coil spring 9, so the jaw 6 does not move backward to accommodate a mandrel with a large shaft diameter, as would be the case if a conventional nosepiece were attached. Therefore, even if the axial length of the mandrel 4B is shortened compared to conventional cases, the large diameter mandrel 4B can be clamped by the jaw 6.

Specifically, the conventional rivet holding part 50 and the rivet holding part 5 of the present invention will be described with reference to the drawings. The diameter of the mandrel 4B of the blind rivet 4 is 4.8 mm. The conventional rivet holding part 5 shown in FIG. 3(a) includes a jaw 6, a jaw case 7, a casing 80 that covers the jaw case 7, and a nose piece 81 that is detachably attached to the tip of the casing 80. In FIG. 3(a), the mandrel 4B has a large shaft diameter, so the jaw 6 is pushed backward by the nose piece 81 to increase the inner diameter of the jaw 6, so that the mandrel 4B with a large shaft diameter can be held by the jaw 6. Since the jaw 6 is moved by the nose piece 81 and the nose piece 81 protrudes from the casing 80 toward the tip side, the axial length L3 of the mandrel 4B that is longer than the dimension L1 from the tip of the nose piece 81 to the rear end of the jaw 6 is required. In contrast, in the present invention, the nose piece 81 is not necessary, and the diameter dimension of the tip opening 7A in the jaw case 7 corresponds to the axial diameter of the mandrel 4B of the blind rivet 4 to be used, so that the inner diameter 6a of the jaw 6 housed in the jaw case 7 corresponds to the axial diameter S1 of the mandrel 4B. This allows the mandrel 4B to be clamped by the jaw 6 without moving the jaw 6 backward, so the dimension L2 from the tip of the outer case 8 to the rear end of the jaw 6 can be made shorter than the conventional dimension L1. Therefore, even if the axial length L4 of the mandrel 4B is shortened compared to the axial length L3 of the conventional mandrel 4B, the large diameter mandrel 4B can be clamped by the jaw 6. In addition, not only can the nose piece 81 be made unnecessary, but the axial length of the mandrel 4B can be shortened. Most of the mandrel is cut off and discarded during construction, meaning it does not contribute to fastening, so shortening the axial length contributes to reducing the cost of the blind rivet. In addition, the manufacturing cost of the rivet holding part 5 can also be reduced.

Figures 4(a) and (b) also show the case where the mandrel 4B of the blind rivet 4 is clamped with a diameter smaller than 4.8 mm. Figure 4(a) shows a conventional rivet holding part 50, which includes a jaw 6, a jaw case 7, a casing 80 that covers the jaw case 7, and a nose piece 81 that is detachably attached to the tip of the casing 80. In contrast, the present invention does not require the nose piece 81, so that the dimension L2 from the tip of the outer case 8 to the rear end of the jaw 6 (the same dimension as in Figure 3(b)) can be made shorter than the conventional dimension L5 by the dimension M of the nose piece 81 protruding from the casing 80.

In addition, the exterior case 8 is formed from a single material such as any of a variety of metals. If the exterior case is formed from a single material, it can be integrally formed to eliminate the need for an assembly process, which is advantageous in the manufacturing process.

In addition, the outer case 8 is subjected to a hardening process such as quenching around the through hole 8A, so that the hardness around the through hole 8A is greater than the hardness of the other parts. In this way, if the outer case 8 has a greater hardness around the through hole 8A than the other parts, early damage to the area around the through hole 8A can be suppressed even if the jaw 6 abuts against the inner surface 8B at the tip end of the rivet holding portion 5 due to the biasing force of the coil spring 9. In this embodiment, the outer case 8 is integrally formed, but the outer case may be composed of multiple members. For example, the outer case may be constructed by forming the area around the through hole 8A from a separate member with a high hardness, and attaching this separate member to the outer case body by screwing or fitting, etc.

The axial dimension of the jaws 6 of each of the multiple replaceable rivet holders 5 is the same. In this way, if the axial dimension of the jaws 6 of each of the multiple replaceable rivet holders 5 is the same, the axial lengths of mandrels 4B with different diameters can be made the same, as shown in Figures 3(b) and 4(b).

The main body 2 includes a hydraulic mechanism 11 that operates with hydraulic oil supplied from the hydraulic oil supply means 3, and a mandrel recovery unit 12 that is connected to the rear end of the hydraulic mechanism 11. The mandrel recovery unit 12 recovers the mandrel 4B that has been pulled out of the blind rivet 4.

The hydraulic oil supply means 3 includes an oil tank 13 for storing hydraulic oil and an air cylinder 14.

The oil tank 13 is connected to the lower end of the hydraulic mechanism 11, and is configured so that hydraulic oil in the oil tank 13 can be supplied to the first space A1 (described below) via an oil passage 1H formed in the handle 1.

The air cylinder 14 comprises an air cylinder body 15 that defines an internal space A, and a piston 16 that is fitted inside the air cylinder body 15. The piston 16 comprises a piston body 17 and a piston rod 18 that has one end (the lower end in FIG. 1) journaled to the piston body 17.

The hydraulic mechanism 11 includes a cylindrical cylinder body 19 and an oil piston 20 that is mounted inside the cylinder body 19 and can move axially relative to the cylinder body 19.

The cylinder body 19 forms a cylindrical internal space, and at one end (tip end) is formed a rod insertion hole 19A for inserting the piston rod 20B described below, and at the other end (rear end),

The oil piston 20 includes a piston portion 20A that divides the internal space of the cylinder body 19 in the axial direction into a first space A1 at one end (tip) and a second space A2 at the other end (rear), and a piston rod 20B that is connected to the piston portion 20A and extends from one end (tip) of the cylinder body 19, with the jaw case 7 connected to the tip side via an auxiliary cylindrical body 21. The piston rod 20B is connected with its base end penetrating the piston portion 20A.

The hydraulic mechanism 11 has two coil springs 22, 23 with different outer diameters arranged between the piston 20A and the rear wall 24A of the cylindrical body 24 connected to the other end (rear end) of the cylinder body 19, and hydraulic oil is supplied from the hydraulic oil supply means 3 to the first space A1. The oil piston 20 moves toward the other end (rear end) of the cylinder body 19 against the biasing force of the two coil springs 22, 23.

The riveter is equipped with a switching valve 26 that switches between supplying and stopping compressed air to the piston 16 by switching a trigger switch 25 provided on the handle portion 1 to ON or OFF. Therefore, by turning the trigger switch 25 ON, compressed air from an air supply source (not shown) is supplied to the bottom side of the air cylinder body 15, and by turning the trigger switch 25 OFF, the supply of compressed air from the air supply source (not shown) is cut off and the compressed air on the bottom side of the air cylinder body 15 is released.

To explain how the riveter works, first, the mandrel 4B of the blind rivet 4 is inserted into the through hole 8A of the exterior case 8. This insertion positions the mandrel 4B inside the jaw 6. When the trigger switch 25 is turned on in this state, compressed air is supplied to the air cylinder 14, causing the piston 16 to move upward and push the hydraulic oil in the oil tank 13 into the first space A1. Then, the pressure of the hydraulic oil in the first space A1 moves the oil piston 20 toward the other end (rear end) of the cylinder body 19 against the biasing force of the coil springs 22, 23.

When the oil piston 20 moves toward the other end (rear end) of the cylinder body 19, the jaw case 7 connected to the piston rod 20B of the oil piston 20 moves toward the other end (rear end). When the jaw case 7 moves a predetermined amount, the jaw 6 biased by the coil spring 9 comes into contact with the mandrel 4B and is sandwiched between the mandrel 4B, and while maintaining this sandwiched (clamped) state, it moves toward the other end (rear end) together with the jaw case 7 against the biasing force of the coil spring 9.

Then, when the jaw 6 holding the mandrel 4B starts to be pulled, the rivet body 4A is crimped and the mandrel 4B is pulled out of the rivet body 4A, and the speed of movement of the oil piston 20, which is no longer loaded, increases dramatically and reaches the limit position at the other end of the cylinder body 19.

When the rivet body 4A is crimped and the operator turns off the trigger switch 25, the compressed air in the air cylinder 14 is exhausted, and the oil piston 20 is pushed back toward the tip of the cylinder body 19 by the biasing force of the coil springs 22, 23 of the hydraulic mechanism 11, and the jaw 6 is returned to one end (tip) of the exterior case 8. As a result, the jaw 6 releases the clamping of the mandrel 4B, and when the flow path opening/closing switch 27 is ON, compressed air is supplied into the pin transfer path 28 via the second space A2 of the cylinder body 19, and the mandrel 4B moves backward and is collected in the mandrel collection section 12.

When the above crimping operation is completed and a blind rivet with a different diameter is to be used in the next crimping operation, the previously used rivet holding part 5 is removed from the main body 2 (unscrewed) and then a rivet holding part corresponding to the diameter of the blind rivet with a different diameter is attached (screwed) to the main body 2. Note that the riveter may be sold as a riveter equipped with multiple rivet holding parts corresponding to mandrels of different diameters, or multiple rivet holding parts may be sold separately.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the above embodiment, a riveter equipped with hydraulic oil supply means 3 operated by a supply of compressed air was described, but for example, the riveter may be configured to supply hydraulic oil to the hydraulic mechanism section 11 from a hydraulic unit as the hydraulic oil supply means. Also, the hydraulic oil supply means 3 may be separately provided and hydraulic oil may be supplied by a separately provided hydraulic oil supply means, or the riveter may be an electric riveter.

1...Handle portion, 1H...Oil passage, 2...Main body, 2A...Male thread portion, 3...Hydraulic oil supply means, 4...Blind rivet, 4A...Rivet body, 4B...Mandrel (shaft), 5...Rivet holding portion, 6...Jaw, 6A...Split body, 6a...Inner diameter, 7...Jaw case, 7A...Tip opening, 8...Outer case, 8A...Through hole, 8B...Tip side inner surface, 8N...Female thread portion, 9...Coil spring, 10...Jaw pusher, 11...Hydraulic mechanism portion, 12...Mandrel recovery portion, 13...Oil tank, 14...Air cylinder, 15...Air cylinder body, 16...Piston, 17...Piston main body Body, 18...piston rod, 19...cylinder body, 19A...rod insertion hole, 20...oil piston, 20A...piston portion, 20B...piston rod, 21...auxiliary cylindrical body, 22, 23...coil spring, 24...cylindrical body, 24A...rear wall portion, 25...trigger switch, 26...switching valve, 27...flow path opening/closing switch, 28...pin transfer path, 50...rivet holding portion, 80...casing, 81...nose piece, A...internal space, A1...first space, A2...second space, L1, L2, L5...dimension, L3, L4...shaft length, M...dimension, P1, P2...diameter dimension, S1, S2...shaft diameter

Claims (6)

The present invention relates to a rivet holder that is replaceably provided at a tip of a main body and that holds a blind rivet.
The rivet holding portion includes a jaw, a jaw case, and an outer case,
the jaws are configured to be capable of inserting and clamping a mandrel of the blind rivet, and are biased toward the tip side by a biasing force of a biasing means provided within the outer case,
The jaw case is configured so that the jaw can be mounted inside a tip portion thereof, and an inner peripheral surface of the tip portion is tapered toward the tip side,
the exterior case is a cylindrical body configured to exteriorly house the jaw case, and is provided at its tip with a through hole having a diameter dimension corresponding to the shaft diameter of the mandrel of the blind rivet,
The outer cases of the plurality of replaceable rivet holders are configured to have the same shape except for the through holes,
The jaw is brought into contact with the inner surface of the tip end of the outer case by the biasing force from the biasing means until the blind rivet is held by the rivet holding portion,
said replaceable rivet holding parts each have a diameter dimension of a tip opening in said jaw case that corresponds to the shank diameter of the mandrel of the blind rivet to be used, or a radial thickness dimension of said jaw that corresponds to the shank diameter of the mandrel of the blind rivet to be used, so that the inner diameter of said jaw corresponds to the shank diameter of the mandrel , thereby ensuring that the tip position of said jaw that abuts against the outer case is the same regardless of the size of the shank diameter of the corresponding mandrel . The riveter of claim 1, characterized in that the outer case is formed from a single material. The riveter according to claim 1 or 2, characterized in that the hardness of the exterior case around the through hole is greater than the hardness of other parts. The riveter according to claim 1 or 2, characterized in that the axial dimensions of the jaws of each of the multiple replaceable rivet holders are the same. The main body includes a hydraulic oil supplying means for supplying hydraulic oil, and a hydraulic mechanism unit operated by the hydraulic oil supplied from the hydraulic oil supplying means,
The hydraulic mechanism includes a cylindrical cylinder body and an oil piston that is axially movable relative to the cylinder body.
the oil piston includes a piston portion that divides an internal space of the cylinder body into one end side and another end side in an axial direction, and a piston rod that is connected to the piston portion and extends from one end of the cylinder body toward the outer case,
2. The riveter according to claim 1, wherein the jaw case and the piston rod are connected via an auxiliary cylindrical body. A rivet holder that is replaceably provided at the tip of a main body of a riveter and that has a jaw, a jaw case, and an outer case to hold a blind rivet in a state where the jaw case is attached to the main body,
the jaws are configured to be capable of inserting and clamping a mandrel of the blind rivet, and are biased toward the tip side by a biasing force of a biasing means provided within the outer case,
The jaw case is configured so that the jaw can be mounted inside a tip portion thereof, and an inner peripheral surface of the tip portion is tapered toward the tip side,
the exterior case is a cylindrical body configured to exteriorly house the jaw case, and is provided at its tip with a through hole having a diameter dimension corresponding to the shaft diameter of the mandrel of the blind rivet,
The outer cases of the plurality of replaceable rivet holders are configured to have the same shape except for the through holes,
The jaw is brought into contact with the inner surface of the tip end of the outer case by the biasing force from the biasing means until the blind rivet is held by the rivet holding portion,
A rivet holding part characterized in that each of the multiple replaceable rivet holding parts has a diameter dimension of a tip opening in the jaw case that corresponds to the shank diameter of the mandrel of the blind rivet to be used, or a radial thickness dimension of the jaw that corresponds to the shank diameter of the mandrel of the blind rivet to be used, so that the inner diameter of the jaw corresponds to the shank diameter of the mandrel, thereby ensuring that the tip position of the jaw that abuts against the outer case is the same regardless of the size of the shank diameter of the corresponding mandrel .