JPS6016450Y2 - Riveter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a riveter, and more specifically, to the provision of a riveter for the purpose of facilitating the assembly work of a rivet core material extraction section.

As is well known, a rivet applied to a riveter is composed of a cylindrical rivet main body having a flange at one end, and a rivet core material having a large diameter head at one end that is inserted through the rivet main body. By pulling out the rivet core material, the member to be riveted is riveted by the collar and the other end of the rivet body, which has expanded and deformed due to the pressure applied when the head is pulled out.

In this case, as shown in FIG. 1, the rivet core material extraction part 1 of the glue bellator for pinching and pulling out the rivet core material has conventionally had an inner hole 2 that is contracted to expand and contract in the radial direction to pinch and pull out the rivet core material. a chuck body 3, a cylindrical chuck casing 4 into which the chuck body 3 is coaxially inserted; The spring 5 is mainly composed of the wedge body 6 and the wedge body 6.
It is interposed between the chuck casing 4 and a pivot shaft 8 which extends through the chuck casing 4 in the radial direction and pivotally connects the casing 4 to the swinging gripping rod 7 in a resilient manner in the extension direction.

In the above conventional configuration, when the chuck body 3 is replaced in accordance with the diameter of the rivet core material, the pivot shaft 8
By removing the chuck body 3, the chuck body 3 together with the spring 5 and the wedge body 6 is once removed from the chuck casing 4, and then the wedge body 6 and the spring 5 are placed inside the same chuck casing 4 together with the other chuck body 3.

However, the work of assembling the spring 5 into the chuck casing 4 as described above was extremely complicated.

That is, first, as shown in FIG. , this spring 5 is pressed in the direction of contraction.
While maintaining the contracted state, the pivot shaft 8 is communicated with the swinging gripping rod 7, the chuck casing 4, and the notch 9, as shown in FIG. to connect.

Then, when the pressing tool 10 is removed as shown in FIG. is completed.

However, as described above, the assembly of the spring 5 is complicated, and the configuration is also complicated, such as requiring the pressing tool 10 with the notch 9 formed therein. It was hoped that the

Therefore, in order to facilitate the above-mentioned assembly work, a method described in Japanese Unexamined Patent Publication No. 108077/1983 has been proposed.

According to this conventional technology, the spring is pushed in with a pressing tool and the spring is held in its contracted state with a temporary holding pin, so the pivot shaft can be inserted by removing the pressing tool and the assembly work can be simplified. This is intended to make it easier.

However, this prior art requires a temporary holding pin and requires a pin insertion hole to be formed in the chuck casing, making it unsatisfactory.

The present invention has been devised in view of the problems of the conventional art, and its features include a chuck body 24 in which the inner hole 23 expands and contracts in the radial direction to clamp the rivet core material. Then, press the chuck body 24 to open the inner hole 23.
A wedge body 25 that expands the wedge body 25 and a coil spring 26 that presses the wedge body 25 are fitted concentrically and in series into the inner hole of the cylindrical chuck casing 17, and the riveter has a bed core material pull-out part. In this case, the coil spring 26 is a tapered coil spring, and its wedge pressing side end has a small diameter and loosely fits into the inner hole of the chuck casing 17, and its large diameter side end fits into the inner hole of the chuck casing 17. It is removably locked to the inner circumferential surface 22.

The illustrated embodiments shown in FIG. 2 and below will be described below.

The riveter 11 has a piston shape as a whole, and an outer cylindrical body 13 that protrudes forward is integrally formed on the upper part of a fixed gripping rod 12. A cylindrical base 1 is attached to the front end of the protruding end of the outer cylindrical body 13.
4 is detachably screwed onto another cap 15 so as to be replaceable.

The cylindrical cap 14 is coaxial with the outer cylinder 13, and has a wedge 16 at its end projecting into the outer cylinder 13.

The other caps 15 are each removably screwed onto the fixed gripping rod 12, and the inner hole diameters of each cap 14, 15 are different in diameter to match various rivet core materials.

The front part of a cylindrical chuck casing 17 is fitted into the outer cylinder body 13 on the same axis so that it can be inserted and removed, and the rear end of the same is rotatably attached to the fixed gripping rod 12 by a pivot 18 that is lateral to the axis. It is pivotally connected to a pivotally connected swinging gripping rod 19 via a pivot shaft 20 extending laterally to the axis.

The pivot shaft 20 is inserted through the swing gripping rod 19 and the chuck casing 17 so as to be freely insertable and removable.

Further, the gripping portion 19a of the swinging gripping rod 19 is connected to the fixed gripping rod 1.
An expansion spring 21 is provided on the pivot shaft 18 so that the expansion spring 21 is elastically expanded apart from the second grip portion 12a rearward.

A conical engagement surface 22a whose diameter decreases toward the front is formed at the front end of the inner circumferential surface 22 of the inner hole of the chuck casing 17, and an inner hole 23 is formed in the chuck casing 17 so as to be freely expandable and contractable in the radial direction. A two-split chuck body 24 that holds the rivet core material is inserted into the chuck body 24, and the conical outer peripheral surface 24a of the chuck body 24 is brought into contact with the conical engagement surface 22a so as to be slidable in the axial direction. There is.

The front protruding end of the chuck body 24 from the chuck casing 17 is pressed into contact with the wedge surface 16.

The chuck casing 17 also includes a chuck body 24.
A wedge body 25 is inserted from the rear surface (7) to enlarge the inner hole 23 of the chuck body 24, and one end is removably engaged with the inner circumferential surface 22 of the chuck casing 17 in the axial direction, and the other end is A spring 26 that presses the wedge body 25 in a direction in which the chuck body 24 is pressed is removably inserted therein.

The spring 26 is a coil spring,
The diameter of the side that presses the chuck body 24 is smaller than the inner hole diameter d of the chuck casing 17, and is loosely fitted into the casing 17.The diameter of the other end gradually increases as it moves backward, and then The diameter of the end is chuck casing 1
The inner hole diameter d of No. 7 is slightly larger than the inner hole diameter d of No. 7.

If the rear end of the spring 26 is slidably inserted into the inner circumferential surface 22 via the pressing member 27, the front end of the spring 26 can be moved to any position in the axial direction while elastically pressing the wedge body 25. The rear end of the spring 26 elastically presses the inner circumferential surface 22 in the radial direction and is locked to the inner circumferential surface 22 by an axial frictional force.

The chuck casing 17, chuck body 24, wedge body 25, and spring 26 mainly constitute a rivet core material extraction section 28.

Therefore, to explain the action of the lever 11 based on the structure mentioned above, as shown in the second figure, when the swing gripping rod 19 is expanded relative to the fixed gripping rod 12, the expansion spring 21 causes the gripping lever 11 to be chucked. The casing 17 is being pushed forward,
The chuck body 24 is narrowly pressed between the wedge surface 16 and the wedge body 25 from the front and rear directions, and the inner hole 23 thereof is enlarged.

In this state, the rivet core material is inserted into the cylindrical base 14 and the inner hole 23 of the chuck body 24.

Next, when the swinging gripping rod 19 is gripped and swung in the direction of the fixed gripping rod 12, the chuck casing 17 moves backward, and the wedge surface 16 and the chuck body 24 are separated.

As a result, the spring 26 pushes the chuck body 24 forward via the wedge body 25, and due to the sliding contact between the conical engagement surface 22a and the conical outer peripheral surface 24a, the inner hole 23 of the chuck body 24 is contracted, and the rivet Sandwich the core material.

Further, by swinging the swinging gripping rod 19, the rivet core material is pulled in from the rivet body, and the rivet tightening work is completed.

Next, referring to FIG. 3, the assembly procedure of the rivet core material pull-out section 28 will be explained. First, the chuck body 24 is inserted into the chuck casing 17 (FIG. 3a).

Next, the wedge body 25 is inserted, and the spring 26 is inserted from the small diameter side, and the rear end of the spring 26, which is the large diameter part, is pushed by the pressing member 27 to force the spring 26 into the chuck casing 17. (Figure 3b).

Then, insert the rear end of the spring 26 into the insertion hole 2 of the pivot shaft 20.
Push the pressing member 27 to the position passing through 0a in the axial direction.
If the spring 26 is removed, the spring 26 is locked in the chuck casing 17 in a state where the wedge body 25 is pressed (the third
Figure C).

Then, in this state, if the chuck casing 17 and the swinging gripping rod 19 are pivotally connected by the pivot shaft 20, the assembly work is completed.

In the above case, when pushing the rear end of the spring 26 and forcibly inserting it into the chuck casing 17 (Fig. 3b)
If the spring 26 is inserted while applying a force in the opposite direction to the winding direction, the spring 26 will be inserted into the chuck casing 17 smoothly because the diameter of the spring 26 will be reduced.

When this pushing motion is stopped, the spring 26 returns to its original shape due to its elastic force, with the rear end of the waist spring 26 touching the inner circumferential surface 22.
It is firmly locked in.

This locking is maintained even when the chuck casing 17 and the swing gripping rod 19 are disassembled.

Conversely, when removing the spring 26 from the chuck casing 17 and disassembling the rivet core material pull-out section 28, the spring 26 may be pulled out with a force greater than the frictional force that locks it against the inner circumferential surface 22; Similarly, it is preferable to pull out the spring 26 while applying force in the opposite direction to the winding direction.

According to the present invention, since the spring 26 is held in the chuck casing 17 while pressing the wedge body 25 without requiring a separate holding member, the rivet core material extraction portion 2
8 can be easily assembled, which is beneficial in terms of assembly time.

In addition, the spring 26 is placed inside the chuck casing 17,
When inserting the wedge body 25 to press it, no special tools or tools are required.
That is, since the conventional tool with the notch as described above is not required and a simple pressing member is sufficient, the structure as a whole is simple, and the invention is extremely useful in practice.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a conventional structure, FIG. 2 is a side cross-sectional view showing an embodiment of the present invention, and FIG. 3 is an enlarged explanatory view of the main parts of FIG. 2. 17...Chuck casing, 22...
・Inner peripheral surface, 23...Inner hole, 24...Chuck body, 25...Wedge body, 26...
Spring, 28...Rivet core material extraction part.

Claims (1)

[Scope of Claim for Utility Model Registration] A chuck body 24 whose inner hole 23 expands and contracts in the radial direction to clamp the rivet core material, and a wedge body 25 which presses the chuck body 24 to enlarge the inner hole 23. , in a riveter in which a coil spring 26 that presses the wedge body 25 has a rivet core material extraction portion that is fitted concentrically and in series into the inner hole of the cylindrical chuck casing 17; It is a tapered coil spring, and its wedge pressing end has a small diameter and loosely fits into the inner hole of the chuck casing 17, and its large diameter end engages and disengages from the inner circumferential surface 22 of the inner hole of the casing 17. The bellator is characterized by being latched freely.