JPH0678610U - Rotating rivets - Google Patents

Abstract

(57) [Summary] [Purpose] Regarding rivets used for fastening members,
An object is to provide a structure that allows the mounting member to rotate. A rivet having a flange 1a at the tip of a cylindrical body 1d, the body 1d
That is, the thin portion 1b for caulking is provided at the rear end of the rear.
Thereby, the caulking height can be adjusted and the mounting member can be freely rotated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rivet used for fastening members, and more particularly, to a rotating rivet in which at least one member is rotatable with a gap secured between the members.

[0002]

[Prior art]

 The rivet, which two members are superposed and inserted into the communicating through holes, and one end of which is crushed with a tool for fastening, has improved work efficiency and has recently been made easier to fasten with rivets. The one shown in FIG. 11 is known.

This rivet is composed of a rivet body 1 having a flange 1a at the tip of a cylindrical body 1d and a mandrel 2 having a ball 2a at the rear end of a rod 2b. As shown, the tip of the rod-shaped portion 2b is inserted into the through hole from the rear end side of the body 1d so that the ball-shaped portion 2a of the mandrel 2 is locked to the rear end of the body 1d. There is.

To use the rivet as described above, as shown in FIG. 9, for example, the through holes of the mounting member 3 and the printed circuit board 4 are overlapped with each other and the rivet is inserted from one side. Then, using a rivetter (not shown), the flange 1a of the rivet body 1 is brought into contact with the printed circuit board 4, and the rod-shaped portion 2b of the mandrel 2 is strongly pulled in the direction of the arrow by the jaws of the rivetter.

By this action, the ball-shaped portion 2a of the mandrel 2 is drawn into the through hole of the body body 1d, and since the outer diameter of the ball-shaped portion 2a is larger than the hole diameter of the through hole, as shown in FIG. The rear end portion of 1d is spread and crimped.

When the rod-shaped portion 2b is further pulled, the outer surface of the rear end portion of the body 1d that has been pushed out abuts the corner portion of the mounting member 3 to increase resistance, and when the predetermined tensile force is reached, the ball-shaped portion The portion 2a and the rod-shaped portion 2b are cut at the base portions to be in the state shown in FIG. In this way, the ball-shaped portion 2a is left in the rear end portion of the body body 1d, the rivet body 1 is caulked, the mounting member 3 and the printed circuit board 4 are fastened, and the cut rod-shaped portion 2b is discharged by the riveter.

As described above, the rivet fastens and fixes the mounting member 3 and the printed circuit board 4. On the other hand, in order to make the mounting member 3 rotatable with respect to the printed circuit board 4, the device shown in FIG. 12 has been devised.

That is, the spacer 5 having a half thin plate thickness is interposed between the surface of the printed board 4 and the surface of the flange 1a. In this way, after the caulking work is performed by the riveter in the same manner as described above, the spacer 5 is removed, so that a gap corresponding to the plate thickness of the spacer 5 is generated and the mounting member 3 can be rotated.

[0009]

[Problems to be solved by the device]

 However, in the method in which the mounting member 3 is rotatable, the spacer 5 must be prepared as a jig, and the work of inserting and removing the spacer 5 is required, which increases the cost and the caulking work. However, there is a problem that extra work is required and work efficiency is poor.

The present invention has been made in view of the above problems, and a rivet that does not require a component such as a spacer for rotating a mounting member and does not increase the number of caulking work steps. The purpose is to provide.

[0011]

[Means for Solving the Problems]

 The gist of the present invention to solve the above problems and achieve the above object is a rivet having a flange at the front end of a cylindrical body, and a thin portion for caulking is provided at the rear end of the body. It is provided.

Further, a rivet body having a flange at the front end of a tubular body body and a mandrel having a ball-shaped portion at the rear end of a rod-shaped body are inserted into a through hole of the body body from one end side. In a rivet rivet, a thin portion for caulking is provided at the rear end portion of the body body, and the depth of the thin portion from the rear end surface of the body body is spread by caulking work. The depth is set so that the ball-shaped part is not held when it is touched.

[0013]

[Action]

 According to the rivet of the present invention, the crimping is stopped at the boundary between the thick portion and the thin portion of the body body, whereby the crimping height of the body body can be adjusted, and the mounting member can be freely rotated. it can. Also, after caulking the thin-walled part with a rivet rivet, if the thickness of the thin-walled part is shortened so that the ball-shaped part does not remain in the caulked part, caulking work can be performed with a low crimping force, and the ball-shaped part can also be caulked. Since it does not remain in the part, there is no risk that the ball-shaped part will fall into the electrical parts in an unexpected situation and short-circuit.

[0014]

【Example】

 Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional view of a rotary rivet according to the present invention, FIG. 2 (a) is a vertical sectional view showing a state in which the rivet is swaged, and (b) is an enlarged view of a part thereof. It is a figure. In the figure, reference numeral 1 is a rivet body, 2 is a mandrel, 1b is a thin portion, and 1d is a body body. The parts corresponding to those of the conventional example are designated by the same reference numerals.

As can be seen by comparing the conventional rivet of FIG. 8 with the rotary rivet of FIG. 1 according to the present invention, the rotary rivet according to the present invention is used for caulking at the rear end of the body 1d. That is, the thin portion 1b is provided.

The thin portion 1b has a stepped portion 1c at the rear end portion of the body 1d with a diameter from the end face to a predetermined depth a larger than the diameter of the through hole of the body 1d. It will be.

Of the overall length b under the neck of the body 1d, the portion of the depth a is the thin portion 1b, and the portion of the length c under the neck is the thick portion.

In this way, if the rotary rivet is caulked with the rivet in the same manner as in the conventional case, as shown in FIG. 2A, the ball-shaped portion 2a of the mandrel 2 is pulled up to the step portion 1c, and the step portion 1c is further pulled. The rod-shaped portion 2b of the mandrel 2 is cut from the root portion by a sudden impact force due to a change in wall thickness of the portion 1c. Therefore, the caulking at the bead portion 2a stops at the position of the step portion 1c.

Since the under-neck length c is longer than the total thickness d of the mounting member 3 and the printed circuit board 4, as shown in FIG. 2B, the surface of the mounting member 3 and the stepped portion are A gap s is provided between the gap and 1c.

By securing the gap s, the mounting member 3 can rotate with respect to the printed circuit board 4.

The thin portion 1b for crimping, which is the main part of the present invention, is the step portion 1c in the above-mentioned embodiment, but the object of the present invention is achieved if the height of crimping can be set appropriately. The present invention also includes other embodiments shown in FIGS. 3 (a) to 3 (d).

That is, as shown in FIG. 3A, the thin portion 1b is formed by providing a taper 5 which is tapered toward the rear end surface of the body 1d. As shown in FIG. 3B, a plurality of steps 6 and 1c are provided to form the thin portion 1b.

As shown in FIG. 3C, it is a combination of the above-mentioned taper and step portion, in which the taper 5a and the step portion 1c are provided to form the thin portion 1b. Further, as shown in FIG. 3D, a recessed groove 7 is provided in the through hole of the body 1d to form the thin portion 1b.

In addition, when providing the above-mentioned taper, stepped portion, or recessed groove, it is possible to include all or some curved portions or curved portions, and the present invention is not limited to those shown in the drawings. Of course.

Further, FIGS. 4 to 7 show another embodiment. In this example, the depth e of the thin portion 1b of the body 1d is shortened to, for example, about half the height of the bead portion 2a, and when the caulking is performed, the bead portion 2a is made into a thin portion 1b. It was made so as not to be held. Therefore, by preventing the ball-shaped portion 2a from remaining in the caulking portion after the caulking work, the fastening with a low crimping force is realized and foreign matter is prevented from entering.

The rotary rivet shown in FIG. 4 has a depth a obtained by further shortening the depth a of the thin portion 1b shown in FIG. 1, and the roots of the ball-shaped portion 2a and the rod-shaped portion 2b are cut with a low tensile force. The small diameter portion 2c is used for the sake of simplicity.

The rotary rivet shown in FIG. 5 is formed by cutting the outer wall of the body 1d when forming the thin portion 1b. The small diameter portion 2c is the root of the ball-shaped portion 2a and the rod-shaped portion 2b.

If such a rotating rivet is used, as shown in FIG. 6, if the rod-shaped portion 2b of the mandrel 2 is pulled out by a rivet, the thin portion 1b is pushed and spread with a low tensile force and crimped. Further, the ball-shaped portion 2a is pulled up to the step portion 1c and broken at the small diameter portion 2c.

Then, as shown in FIG. 6B, the rod-shaped portion 2b is discharged by a riveter, and the ball-shaped portion 2a is held by the caulked thin-walled portion 1b because the thin-walled portion 1b has a short depth e. Without falling.

By adopting a type in which the ball-shaped portion 2a is not held by the caulking portion, as shown in FIG. 7, the printed base plate 4 is attached to the mounting member 3 of the soft base material having the engaging portion having a U-shaped cross section. It is possible to engage the fitting holes of the above, make it rotatable by the rotary rivet, and to perform the crimping work with a low crimping force without cracking or deforming the mounting member 3.

The rotating rivet has been described for a rivet, but in FIG. 1, the operation and effect can be obtained even if the rivet body 1 configured without using the mandrel 2 is caulked by a conventional caulking machine. Same as above.

[0032]

[Effect of device]

 As described above, the rotating rivet according to the present invention is a rivet having a flange at the tip of a tubular body, or a rivet body having a flange at the tip of a tubular body, and a rod-shaped rivet. It is a rivet in which a mandrel having a ball-shaped portion at its rear end is inserted into the through hole of the body from one end side, and a thin portion for caulking is provided at the rear end of the body. However, when the caulking work is performed, only the thin portion is caulked, so that the caulking height can be arbitrarily adjusted and the mounting member can be freely rotated.

Further, since the mounting member can be freely rotated without requiring a special gap member such as a spacer, the cost can be reduced with an inexpensive structure, and the excellent effect that caulking work can be efficiently performed can be achieved. Play.

Further, if the depth of the thin-walled portion of the tubular body is set to a short dimension so as not to hold the ball-shaped portion when it is expanded by the crimping work, the crimping operation with a low crimping force can be performed. Since the ball-shaped part does not remain in the caulked part, there is no fear that the ball-shaped part will fall into an electric component due to an unexpected situation and short-circuit, and the safety is improved, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rotary rivet according to the present invention.

FIG. 2A is a vertical cross-sectional view showing a state in which the rotary rivet of the present invention has been caulked, and FIG. 2B is an enlarged explanatory view of a part thereof.

3A to 3D are sectional views showing enlarged main parts of a rotating rivet according to another embodiment.

FIG. 4 is a vertical sectional view of a rotary rivet according to another embodiment.

FIG. 5 is a vertical cross-sectional view of a rotary rivet according to another embodiment.

6A and 6B are explanatory diagrams (A) and (B) showing a state of caulking work of a rotating rivet according to another embodiment.

FIG. 7 is a vertical cross-sectional view of a state in which a rotary rivet of a type in which a ball-shaped portion according to another embodiment is not left in a caulked portion is used.

FIG. 8 is a vertical sectional view showing a structure of a rivet according to a conventional example.

FIG. 9 is a vertical cross-sectional view showing how a member is caulked with a rivet according to a conventional example.

FIG. 10 is a vertical cross-sectional view showing a state during the same caulking work.

FIG. 11 is a vertical cross-sectional view showing a state where the crimping work is completed.

FIG. 12 is a vertical cross-sectional view showing a state where caulking work is performed by using a spacer for a gap with a rivet according to a conventional example.

[Explanation of symbols]

 1 rivet body, 1a flange, 1b thin portion, 1c stepped portion, 1d body body, 2 mandrel, 2a ball-shaped portion, 2b rod-shaped portion.

Claims (3)

[Scope of utility model registration request] 1. A rivet for rotation, which is a rivet having a flange at a front end portion of a tubular body body, wherein a thin portion for caulking is provided at a rear end portion of the body body. 2. A rivet in which a rivet body having a flange at the tip of a tubular body body and a mandrel having a ball-shaped portion at the rear end of a rod-shaped portion are inserted into a through hole of the body body from one end side. A rotary rivet characterized in that a thin portion for crimping is provided at a rear end portion of the body body. 3. The depth of the thin portion from the rear end face of the body is set to a depth that does not hold the ball-shaped portion when it is spread by caulking work. The rotating rivet described in.