JPH05302609A - Push rivet - Google Patents

Abstract

PURPOSE:To prevent any difference in fixed strength, according to the load direction, of a push rivet for mutually connecting panels by forming a pin inserting hole from the flange to the leg portion of a push rivet and bulge the inside surface of the pin inserting hole inward in a tapered shape so that the leg portion may bulge outward by virtue of the inserted pin. CONSTITUTION:A pin inserting hole 5 and a pin driving hole 9 communicating to each other are formed in the flange 4 and the leg portion 6 of a rivet body 2. The leg portion 6 is divided into four divided leg portions 11, 11 (the drawing shows only two) by means of forming a slit 10 almost in a cross shape from the outside circumferential surface of the driving hole 9 to the leg portion 6. Further, a tapered surface 12, which is canted inward more toward the tip, is formed in the interior of the tip of each divided leg portion 11. By means of this constitution, a pin 3 pushed into the pin inserting hole 5 causes the tapered surface 12 of the divided leg portion 11 to be expanded outward by virtue of a tapered surface 19 on a shaft portion 16 of the pin 3 and fixes the push rivet to the substance to be riveted as the leg portion 6 is pressed toward the internal surface of the fitting hole.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rivet used for connecting and fixing panels to each other. More specifically, the rivet body is provided with a leg portion having a hollow portion in a flange portion, and a shaft portion of a pin is provided on the rivet body. The present invention relates to a push rivet in which a leg portion divided into four by a shaft portion of a pin is expanded by press-fitting and a mounting hole is pressed by the leg portion and fixed to an object to be attached.

[0002]

2. Description of the Related Art Conventionally, as a connecting tool used for connecting and fixing panels to each other, such as when mounting various automobile parts on a vehicle body, as shown in FIG. In addition, a push rivet g composed of a rivet body c in which a hollow leg portion b is projected on the lower surface of a flange portion a having a through hole and a pin f in which a shaft portion e is projected on a dish-shaped head d is known. Has been.

The push rivet g has a panel (a bumper h and a body i in the figure) which are connected to each other, and the mounting holes are aligned with each other, and the leg portion b of the rivet body c is inserted into the mounting hole. By inserting the shaft portion of the pin f into the portion b, the leg portion b is spread by the shaft portion e and the mounting hole is pressed by the leg portion b to connect and fix both panels h and i. .. In FIG. 11, j is a cushion material and k is a phosphorus hose.

However, this push rivet g
The tip of the shaft portion e of the pin f that pushes the leg portion b out projects from the tip of the leg portion b, so something hits the protruding tip portion and the shaft portion e of the pin f falls off the rivet body c. There is a risk that the connected state of the panels will disappear. In particular, in the bumper mounting structure of FIG. 11, the step of mounting the bumper h and then mounting the cushion material j may be taken. In this case, the cushion material j hits the tip of the shaft portion e of the pin f and the pin f falls off. There is a great risk that it will end up.

As described above, as a push rivet capable of reliably preventing the connection of the panels from being released by hitting the shaft portion of the pin protruding from the tip of the leg portion, the flange portion having the through hole can be used. A rivet having a hollow portion for inserting a pin on the lower surface and projecting a leg portion divided into two by a slit, and connecting pieces extending from the tip ends of both divided leg portions to each other at their respective tip portions are provided. Actual Public Sho 6
No. 0-21537 is proposed.

This rivet is intended to be fixed in a mounting hole of a panel by inserting the shaft portion of a pin having a male screw formed on the peripheral surface of the shaft into the leg portion and expanding the diameter of the leg portion. The connecting piece can prevent an object from coming into contact with the tip of the shaft of the pin protruding from the tip of the leg. In addition, this rivet can be reused by rotating the pin so that the pin can be easily taken out by the action of the male screw formed on the shaft portion and the rivet can be removed from the mounting hole. ..

However, since this rivet is constructed so that the leg portion divided into two is expanded in two directions, a good fixing force is exerted in the extending direction of the leg portion, but in the extending direction of the leg portion. On the other hand, it is difficult to obtain a sufficient fixing force for the force in the right angle direction, and it is easy to cause inconvenience such as tilting of the rivet.
Also, since the pin cannot be temporarily fixed to the rivet, when inserting from the bottom to the top in the mounting hole, after inserting the rivet leg into the mounting hole, hold the rivet until the pin is inserted. Work is very troublesome. It is possible to insert the pin into the rivet halfway, but in this case, the diameter of the leg portion increases and it is difficult to insert the pin into the mounting hole.

Further, as a rivet capable of temporarily fixing the pin, there is a rivet disclosed in Japanese Utility Model Publication No. 62-2325. However, this rivet also expands the leg portion divided into two in two directions, and the fixing strength varies depending on the direction of the rivet. In addition, this rivet allows you to remove the rivet by rotating the pin and pushing it deeply to release the expanded diameter state of the leg, but in this case, you can reuse the removed rivet. It is necessary to push up the connecting portion at the tip end by pinching it with a finger or the like to raise the pin to return it to the temporarily fixed state, which requires a very troublesome work for reuse.

The present invention has been made in view of the above circumstances, and there is no fear that the fixed state will be released even if an object comes into contact with the tip of the rivet, and there is a difference in the fixing force depending on the direction in which the load is applied. It is a first object to provide a push rivet that does not happen. In addition to these performances, it is a second object of the present invention to provide a push rivet that can be fixed with good workability while the pin is temporarily fixed to the rivet body. Furthermore, in addition to having the above-mentioned performance, the fixed state can be easily released,
Moreover, a third object is to provide a push rivet that can be reused without requiring troublesome work.

[0010]

SUMMARY OF THE INVENTION In order to achieve the first object of the present invention, as a first invention, a pin insertion hole is formed in a flange portion, and a leg portion is projected on a lower surface of the flange portion. The leg insertion portion is formed in the leg portion so as to communicate with the pin insertion hole, and a substantially cross-shaped slit extending from the pin insertion hole to the leg outer peripheral surface is formed to divide the leg portion into four. In addition, a bulging portion having a tapered surface that gradually inwardly inclines toward the tip is provided on the inner surface of the tip of each divided leg, and a connecting piece is further extended from the tip of each divided leg and each tip thereof is extended. The leg portions are inserted into the mounting holes formed in the object to be fixed, the shaft portion of the pin is press-fitted into the pin entry hole from the pin insertion hole, and each of the divided portions is divided by the shaft portion. Press the bulging part of the leg outward, spread each split leg outward, and open the tip of the leg. Is expanded to provide a push rivet, characterized in that at the leg portion is configured to secure the presses the mounting hole the attached object.

In order to achieve the above-mentioned second object, as a second invention, a pin insertion hole is bored in the flange portion, and a leg portion is projectingly provided on the lower surface of the flange portion. A pin entry hole is formed in communication with the pin insertion hole, and a substantially cross-shaped slit extending from the pin entry hole to the leg outer peripheral surface is formed to divide the leg into four parts, and the tip of each divided leg part. A rivet body formed by projecting a locking projection having a tapered surface that gradually inwardly slopes toward the tip on the inner surface of the part, and further extending a connecting piece from the tip of each split leg to connect the respective tip parts. And, a shaft portion is projected on the lower surface of the disk-shaped head, and a deep recessed portion having an upper tapered surface is formed at the tip end portion of the shaft portion along the circumferential direction. And a pin formed by forming a shallow recess along the circumferential direction. The pin is attached to the rivet body by inserting the pin into the pin entry hole of the rivet body through the pin insertion hole and engaging the locking protrusions of the rivet body into the deep recesses of the shaft portion. Becomes
By inserting the leg part into the mounting hole formed in the fixed object and pressing the head part of the pin, the shaft part of the pin enters the pin entry hole and the locking projection at the tip of each leg part is released. Pressed outward by the tapered surface of the deep recess of the shaft, each split leg expands outward and the tip side of the leg expands in diameter, and the locking projection of each split leg enters the shallow recess of the pin shaft. Provided is a push rivet characterized in that, by engaging and holding the expanded diameter state of the leg portion, the leg portion is pressed by the leg portion to be fixed to an attachment object.

Further, in order to achieve the above-mentioned third object, as an embodiment of the above-mentioned second invention, a plurality of pull-up projections are formed on the lower surface of the head of the pin, and the shallow recesses of the shaft portion are formed at both ends in the width direction. Is formed into four shallow recesses, a flat portion is provided between the adjacent shallow recesses, and one end side is formed along the peripheral edge of the pin insertion hole on the upper surface side of the flange body of the rivet body. By pushing up the protrusion and pushing the pin to the deepest part and rotating the pin with the leg part of the rivet body expanded, the pin shaft part rotates in the pin entry hole of the rivet body. Then, the locking projections of the split leg portions move from the shallow recesses to the flat portions, and the push-up projections push up the pull-up projections to pull up the shaft portion of the pin. To move More, provides a push rivet locking projection of the split leg portion is configured so expanded state of the legs to move to the deep recesses of the shank is released.

[0013]

According to the first push rivet of the present invention, the legs are inserted into the mounting holes formed in the panels for connecting the legs to each other.
The shaft portion of the pin is press-fitted into the pin entry hole from the pin insertion hole, and the bulging portion of each of the split leg portions is pressed outward by the shaft portion,
Each of the split leg portions is expanded outward to expand the tip end side of the leg portion, and the leg portions are pressed to fix the attachment holes to the attachment holes, thereby connecting and fixing the panels to each other.
It should be noted that the above-mentioned pin may be any one as long as it has a shaft portion projecting from a disk-shaped head, and has a simple cylindrical shaft portion, and the bulging portion of each split leg portion engages with the cylindrical shaft portion. Various pins such as one having a concave portion and one having a screw threaded on the peripheral surface of the shaft can be used.

In this case, since the leg portion is divided into four by the substantially cross-shaped slit extending from the pin entry hole to the outer peripheral surface of the leg portion, each leg portion is spread in four directions by the entry of the pin shaft portion. The diameter of the part increases. Therefore, there is no difference in the fixing force depending on the direction in which the load is applied, and the rivets can be firmly fixed and the panels can be firmly connected and fixed. Further, since the connecting pieces extending from the tips of the respective split leg portions are connected to each other at the tip portions, the pin shaft portion tips protruding from the tip portions of the legs do not come into contact with each other, and thus carelessly. The fixed state will not be released. Furthermore, when using a pin with a screw threaded on the peripheral surface of the shaft,
The fixed state can be easily released by rotating the pin.

The second push rivet of the present invention, like the first rivet, inserts the head of the pin by inserting the legs of the rivet body into the mounting holes formed in the panels interconnecting each other. Press to push the shaft of the pin into the shaft of the rivet body, and by expanding the diameter of the tip of the leg with this shaft, press the mounting hole to fix it in the mounting hole. To do.

In this case, in the second push rivet, when not in use, the pin is attached to the tip of the pin shank with the tip of the shank inserted into the pin entry hole of the rivet body leg. The locking projection at the tip of the split leg is engaged in the formed deep recess and is attached to the rivet body, so insert the leg of the rivet body into the attachment hole with the pin still attached to the rivet body. You can do the work. Then, by pressing the head of the pin, the shaft of the pin enters the pin entry hole of the leg, and the locking projection at the tip of each split leg is moved outward by the tapered surface of the deep recess of the shaft. When pressed, each split leg portion expands outward and the tip end side of the leg portion expands in diameter, and the locking projection of each split leg portion engages in the shallow recess of the pin shaft portion to increase the diameter of the leg portion. The legs are held, and the mounting holes are pressed by the legs to be fixed in the mounting holes, so that the panels are connected and fixed to each other. Therefore, the rivet can be fixed to the mounting hole very easily by simply pressing the head of the pin. Moreover, as with the first rivet, the leg portion of the rivet body is divided into four divided leg portions that expand in four directions and expand in diameter, so that there is a difference in the fixing force depending on the direction in which the load is applied. It is possible to firmly fix the rivets to firmly connect and fix the panels to each other.

Further, in this second push rivet, a plurality of pulling protrusions are formed on the lower surface of the head of the pin, and the shallow recesses of the shaft portion are four shallow recesses formed by tapering both widthwise end portions. At the same time, a flat portion is provided between the adjacent shallow recesses, and a push-up projection having one end formed in a tapered shape along the peripheral edge portion of the pin insertion hole on the upper surface side of the flange body of the rivet body is provided to project the pin. It is possible to easily release the expanded diameter state of the legs by rotating the legs.

That is, by pushing the pin to the deepest portion and rotating the pin in a state where the leg portion of the rivet body is expanded, the pin shaft portion rotates in the pin entry hole of the rivet body and is divided into each part. As the locking protrusions of the legs move from the shallow recesses to the flat portions, the push-up protrusions push up the pull-up protrusions to pull up the shaft portion of the pin, and the shaft portion is rotated while being pulled up, The locking projection of the split leg moves to the deep recess of the shaft to release the expanded diameter state of the leg. In this way, it is possible to easily release the expanded diameter state and remove it from the mounting hole simply by rotating the pin, and since the removed rivet has returned to the initial state, it can be reused as it is.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a push rivet according to an embodiment of the present invention.
Is composed of a rivet body 2 (push rivet of the first invention) and a pin 3. The rivet body 2 is
As shown in FIGS. 3 to 7, a pin insertion hole 5 is formed at the center of a disc-shaped flange portion 4, and a substantially cylindrical leg portion 6 is provided on the lower surface. The pin insertion hole 5 is
A step portion 7 is formed in the middle portion and a lower surface side opening portion is formed with a diameter smaller than that of the upper surface side opening portion. The step portion 7 is provided with four push-up protrusions 8 formed in a tapered shape on one end side. They are spaced apart from each other and project in the circumferential direction.

A pin entry hole 9 communicating with the pin insertion hole is formed in the leg portion 6 along the axial direction, and a substantially cross shape extending from the pin entry hole 9 to the outer peripheral surface of the leg portion 6 is formed. Shaped slit 10 is formed, and this slit 1
0 means that the leg 6 is divided into four divided legs 11, 11, 11,
It is divided into 11 (see FIG. 7). On the inner surface of the tip of each split leg portion 11, a locking projection 13 having a tapered surface 12 that inclines gradually toward the tip is provided. Then, elongated plate-shaped connecting pieces 14, 14, 14, 14 are integrally formed so as to partially extend from the tips of the respective divided leg portions 11, and these connecting pieces 14, 14, 14, 14 are formed at their tip portions. Are converged at and are connected to each other.

Next, as shown in FIGS. 8 to 10, the pin 3 is formed by integrally projecting a shaft portion 16 having a sharp tip on the lower surface of a disk-shaped head portion 15. The head portion 15 is formed with a cross-shaped recess 17 in the center of the upper surface for engaging the tip of the shaft portion of the + type driver, and at the lower surface edge portion, a pair of shaft portions 16 are provided so as to face each other. The pull-up protrusions 18 and 18 are projected. Further, at the tip of the shaft portion 16, there are four deep recesses 2 each having a tapered surface 19 at the top.
0 (only two are shown in the drawing) are continuously provided along the circumferential direction, and further shallow recesses 21 are provided continuously above the deep recesses 20 along the circumferential direction. Each shallow recess 2
1, both end portions in the width direction are formed in a tapered shape, and a flat portion 22 is formed between adjacent shallow recesses 21. Incidentally, reference numeral 23 in FIG. 9 is a recess formed to save material, and FIG. 9 shows the front side, but the back side has the same structure. Further, the head portion 15 is formed in such a size as to fit snugly into the upper large diameter portion of the pin insertion hole 5 of the rivet body 2, and the diameter of the shaft portion 16 is the pin entry hole 9 of the rivet body 2. It is formed in a size that allows it to freely move in and out.

The push rivet 1 of this embodiment comprises the pin 3 and the rivet body 2, and the shaft portion 16 of the pin 3 is inserted into the pin entry hole 9 of the rivet body 2 as shown in FIG. It is attached in a state of being inserted through the insertion hole 5. In this case, each split leg portion 1 of the rivet body 2 is placed in each deep recess 20 formed at the tip of the shaft portion 16 of the pin 3.
The pin 3 does not come off from the rivet body 2 due to the engagement of the locking projection 13 provided on the inner surface of the front end portion. Further in this state, the head 15 of the pin 3
The upper end of the shaft portion 16 is in a state of protruding from the upper surface of the flange portion 4 of the rivet body 2.

Next, the usage and operation of the push rivet 1 of this embodiment will be described. This push rivet 1 is for connecting and fixing panels to each other or panel-like parts of articles to each other. In this case, as shown in FIG. 2, first, the panels 24 and 25 to be connected and fixed to each other are attached to their respective mounting holes 26 and 26. Are overlapped with each other, and the leg portion 6 of the push rivet 1 is inserted into the mounting hole 26 to bring the lower surface of the flange portion 4 into contact with the panel 24. Then, the head portion 15 of the pin 3 is pressed with a finger so that the shaft portion 16 enters the pin insertion hole 9 and the head portion 15 is fitted into the pin insertion hole 5.

At this time, when the shaft portion 16 of the pin 3 enters into the pin insertion hole 9, the locking projection 13 at the tip of each split leg portion 11 has its upper tapered surface 12 and the deep recess 20 of the shaft portion 16. By the action of the tapered surface 19, the divided leg portions 11 are spread outward, the tip ends of the leg portions 6 are expanded in four directions, and the locking projections 13 of the divided leg portions 11 are pin 3 shaft portions. The expanded state of the leg portion 6 is maintained by engaging in each of the shallow recessed portions 21 of 16. As a result, the expanded leg portion 6 presses the mounting hole 26 to fix the rivet 1 in the mounting hole 26, and both panels 24 and 25 are pressed against the lower surface of the flange portion 4 to form the expanded leg portion 6 and Both panels 24 and 25 are connected and fixed to the flange portion 4. At this time, the head portion 15 of the pin 3 has a pull-up protrusion 18,
The pin 18 is fitted into the pin insertion hole 5 in a state of being in contact with the step portion 7 of the pin insertion hole 5 between the respective push-up protrusions 8. As a result, the upper end opening of the pin insertion hole 5 is closed by the head portion 15 of the pin 3, and the upper surface of the flange portion 4 becomes flat.

As described above, in the push rivet 1 of this embodiment, since the pin 3 is attached to the rivet body 2 from the beginning, the leg portion 6 is inserted into the attachment hole and protrudes from the flange portion 4 of the rivet body 2. The panels can be connected very easily by only pushing the head 15 of the pin 3 by one push. Moreover, since the leg portion 6 is divided into four by the cross-shaped slit 10, each divided leg portion 11 expands in four directions and the diameter of the leg portion 6 expands when the shaft portion 16 enters. Therefore,
There is no difference in the fixing force depending on the direction in which the load is applied, and the rivets 1 can be firmly fixed and the panels can be firmly connected and fixed. Further, as is apparent from FIG. 2, after the pin 3 is pushed in, the tip end of the shaft portion 16 protruding from the tip end of the leg portion 6 is located inside each connecting piece 14, so that the thing of this shaft portion 16 is There is no possibility that the pin 3 is pushed up by coming into contact with the protruding tip portion and the expanded diameter state of the leg portion 6 is inadvertently released.

Further, the push rivet 1 can be easily released from the fixed state and removed from the mounting hole 26 by rotating the pin 3 with a driver. That is, in the state of FIG. 2, the tip of the shaft portion of the + type driver is inserted into and engaged with the cross-shaped recess 17 (see FIG. 8) formed in the head portion 15 of the pin 3, and the pin 3 is rotated. The shaft portion 16 of the pin 2 rotates in the pin insertion hole 9 of No. 2 and the locking projection 13 of each split leg portion 11 moves from the shallow recess 21 to the flat portion 22 between each shallow recess, and the pin insertion hole The push-up protrusion 8 formed on the stepped portion 7 of 5 pushes up the pull-up protrusion 18 provided on the lower surface of the pin 3 head portion 15 to pull up the shaft portion 16 of the pin 3, and the shaft portion 16 rotates while being pulled up. As a result, the locking projections 13 of each split leg portion 11
Moves into the deep recess 20 of the shaft portion 16 to release the expanded diameter state of the leg portion 6, and returns to the initial state of FIG. At this time, the turning operation of the pin 3 only needs to be surely performed by turning the pin 3, and in the initial stage of the turning operation, the pin 3 is automatically pushed up by the action of the taper portion of the push-up projection 8. Further, in the latter half of the rotating operation, the pin 3 is automatically pushed up by the action of the tapered surface 12 of the locking projection 13 and the tapered surface 19 of the deep recess 20 and the elastic restoring force of each split leg 11. In the fixed state where the leg portion 6 is expanded (state of FIG. 2), the head portion 15 of the pin 3 is completely accommodated in the pin insertion hole 5, so that the pin is inadvertently careless. There is no fear that the fixed state will be released by the rotation of 3.

As described above, according to the push rivet 1 of this embodiment, the fixed state can be released and removed from the mounting hole 26 very easily by simply rotating the pin 3 with a screwdriver. Since is returned to the initial state, it can be reused as it is without any troublesome operation.

As described above, according to the push rivet 1 of this embodiment, there is no difference in the fixing force depending on the direction in which the load is applied, the panels can be firmly connected and fixed, and the rivet is also provided. There is no fear that the fixed state will be released even if something comes into contact with the tip part of 1, and furthermore, it is extremely easy by inserting the leg part 6 into the mounting hole and pushing the head 15 of the pin 3 by one push. It can be fixed on. Further, the fixed state can be easily released simply by rotating the pin 3 with a screwdriver, and the removed rivet 1 can be reused as it is without requiring a troublesome work.

The push rivet according to the present invention is not limited to the above embodiment, and the pin and the rivet body may be variously modified without departing from the gist of the present invention. For example, it is also possible to omit the deep concave portion 20 of the pin 3, the pull-up protrusion 18 and the push-up protrusion 8 of the rivet body to press the pin into the leg portion 6 to expand the diameter of the leg portion. It is also possible to use a pin having a screw thread on its peripheral surface or a pin having a simple cylindrical shaft portion. In this case, the fixing work cannot be performed with the pin temporarily fixed to the rivet body, but as with the push rivet 1 of the above embodiment, the leg portion expands in four directions,
There is no difference in the fixing force depending on the direction in which the load is applied, and the panels can be firmly connected and fixed,
Moreover, since the tip of the pin is protected by the connecting piece 14, there is no fear that the fixed state will be released even if something comes into contact with the tip of the rivet. Further, the deep concave portion 20 and the shallow concave portion 21 of the pin 3 may be continuous concave portions in a ring shape. In this case, the fixed state cannot be released by rotating the pin, but the pin is temporarily fixed. It is possible to carry out fixing work with.

[0030]

As described above, according to the first push rivet of the present invention, there is no fear that the fixed state will be released even if the tip portion comes into contact with the object, and depending on the direction in which the load is applied. There is no difference in fixing force,
The panels can be firmly connected and fixed to each other. Also,
According to the second push rivet, the fixing work can be performed with good workability while the pin is temporarily fixed to the rivet body. Further, according to the push rivet of the above embodiment, in addition to having the above-mentioned performance, it is easy to perform. The fixed state can be released, and it can be reused without requiring troublesome work.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing a push rivet according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which panels are connected and fixed using the push rivet and a part of which is cut away to show a cross section.

FIG. 3 is a plan view showing a rivet body forming the push rivet.

FIG. 4 is a front view showing a rivet body forming the push rivet.

FIG. 5 is a side view showing a rivet body forming the push rivet.

FIG. 6 is a bottom view showing a rivet body that constitutes the push rivet.

FIG. 7 is a cross-sectional view taken along the line AA of FIG. 5 showing a rivet body that constitutes the push rivet.

FIG. 8 is a plan view showing a pin that constitutes the push rivet.

FIG. 9 is a front view showing a pin constituting the push rivet.

FIG. 10 is a bottom view showing a pin constituting the push rivet.

FIG. 11 is a cross-sectional view showing a state in which a bumper is attached to an automobile body using a conventional push rivet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 push rivet (push rivet of 2nd invention) 2 rivet main body (push rivet of 1st invention) 3 pin 4 flange part 5 pin insertion hole 6 leg part 8 push-up protrusion 9 pin entry hole 10 cross-shaped slit 11 split leg part 12 Tapered surface 13 Locking protrusion (bulging part) 14 Connecting piece 15 Head 16 Shaft 18 Lifting protrusion 19 Tapered surface 20 Deep recess 21 Shallow recess 22 Flat part 24, 25 Panel (attached object) 26 Mounting hole

Claims (3)

[Claims] 1. A pin insertion hole is bored in a flange portion, and a leg portion is projectingly provided on a lower surface of the flange portion, and a pin entrance hole is formed in the leg portion so as to communicate with the pin insertion hole.
A substantially cruciform slit is formed from the pin entry hole to the outer peripheral surface of the leg to divide the leg into four parts, and the inner surface of the tip of each divided leg is tapered toward the tip as the taper surface gradually inwards. Projecting a bulging portion having, and further extending a connecting piece from the tip of each divided leg portion to connect the respective tip portions,
The leg portion is inserted into the mounting hole formed in the fixed object, the shaft portion of the pin is press-fitted into the pin entry hole from the pin insertion hole, and the bulging portion of each divided leg portion is inserted by the shaft portion. Press outward,
A push rivet characterized in that each of the split leg portions is expanded outward so that the tip end side of the leg portion is expanded, and the leg portion is pressed to fix the attachment hole to an object to be attached. 2. A pin insertion hole is formed in the flange portion, and a leg portion is projectingly provided on the lower surface of the flange portion, and a pin entry hole is formed in the leg portion so as to communicate with the pin insertion hole.
A substantially cruciform slit is formed from the pin entry hole to the outer peripheral surface of the leg to divide the leg into four parts, and the inner surface of the tip of each divided leg is tapered toward the tip as the taper surface gradually inwards. And a rivet body formed by extending a connecting piece from the tip of each of the divided leg portions and connecting the respective tip portions, and a shaft portion protruding from the lower surface of the disk-shaped head. And a pin formed by forming a deep recessed portion having a tapered surface at the tip of the shaft portion along the circumferential direction and forming a shallow recessed portion above the deep recessed portion along the circumferential direction. Then, the shaft portion of the pin is inserted into the pin entry hole of the rivet body through the pin insertion hole, and the locking protrusions of the rivet body are engaged in the deep recesses of the shaft portion,
The pin is attached to the rivet body, the leg portion is inserted into the attachment hole formed in the fixed object, and the head portion of the pin is pressed, so that the shaft portion of the pin enters the pin entry hole. The locking projection at the tip of each split leg is pressed outward by the taper surface of the deep recess of the shaft, each split leg expands outward, and the tip end side of the leg expands. The stopper projection is engaged in the shallow recess of the pin shaft portion to maintain the expanded diameter state of the leg portion, so that the leg portion is pressed against the mounting hole to be fixed to the mounting object. Push rivet featuring. 3. A plurality of pull-up projections are formed on the lower surface of the head of the pin, and the shallow recesses of the shaft portion are four shallow recesses with both ends in the width direction tapered, and between the adjacent shallow recesses. A flat part is provided on the rivet body, and a push-up protrusion with a tapered end is formed along the peripheral edge of the pin insertion hole on the upper surface side of the flange body of the rivet body. By rotating the pin with the diameter of the part expanded, the pin shaft part rotates in the pin entry hole of the rivet body, and the locking projections of the split leg parts move from the shallow recesses to the flat parts. While moving, the push-up protrusion pushes up the pull-up protrusion to pull up the shaft portion of the pin, and the shaft portion is rotated while being pulled up, so that the locking protrusion of each split leg portion becomes a deep recess of the shaft portion. Move and the leg diameter expansion state Claim 2 configured to be released
Push rivet described.