JP2012062922A - Push rivet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a push rivet which permits the formation of a clearance capable of discharging a foreign material such as mud, sand between a flange of a grommet and a head of a pin in such a normal stopping state that the grommet is inserted to the pin.SOLUTION: The grommet 40 comprises at least the flange 60, a coupling leg 80, a split leg 90 and a swelling part 91. The pin 50 comprises at least a head 100, a shaft 110 and a recessed groove 111 which is formed at a lateral side of the shaft 110, engaged with the swelling part 91, and thereby, enlarges sizes of the coupling leg 80 and the split leg 90. Between the grommet 40 and the pin 50, a contacting means (for example, projected part 65) for forming the clearance is disposed between opposite surfaces of the flange 60 of the grommet 40 and the head 100 of the pin 50 in the normal stopping state.

Description

  The present invention relates to a push rivet for attaching parts such as a bumper and an under cover to a panel of an automobile body or the like, and in a fixed state where a grommet is inserted into a pin, between the flange portion of the grommet and the head portion of the pin. Through the generated clearance, foreign matters such as mud sand and muddy water can be discharged or drained.

Conventionally, a push rivet including a grommet and a pin is known (for example, Patent Document 1).
The above-described conventional push rivet is provided with a push-up protrusion at the bottom of the flange portion of the grommet (paragraph number “0019”, paragraph number “0026” in FIG. 2 and FIG. 3). Further, the conventional push rivet is provided with a lifting protrusion on the head of the pin that engages with the lifting protrusion when the pin is rotated in the fully-fastened state (paragraph number “0021” in Patent Document 1; paragraph Number “0026”, FIGS. 2 and 10).

  The present applicant has already proposed push rivets that employ a structure in which foreign matter such as mud sand cannot easily enter (Japanese Patent Application Nos. 2009-179222 and 2009-179223).

Japanese Patent Laid-Open No. 5-302609

However, since the conventional push rivet described above is in the final stop state, the flange part of the grommet and the head part of the pin are in close contact with each other, and if muddy water or the like enters between them, it is difficult to flow outside, When it dries and hardens inside, there is a problem that both of them are in close contact with each other and it becomes difficult to release the pin.
Accordingly, each invention described in each claim has been made in view of the problems of the conventional techniques described above, and the object thereof is as follows.
(Claim 1)
The object of the present invention is as follows.

That is, according to the first aspect of the present invention, foreign matters such as mud sand and muddy water are discharged or drained through the clearance generated between the flange portion of the grommet and the head portion of the pin in the fully stopped state where the grommet is inserted into the pin. It is something that can be done.
As a result, according to the first aspect of the present invention, foreign matter such as mud sand hardly accumulates between the flange portion of the grommet and the head portion of the pin, and the pin can be easily released.
(Claim 2)
The second aspect of the invention has the following object in addition to the object of the first aspect of the invention.

That is, the invention according to claim 2 is configured such that the clearance can be generated by the protrusion.
As a result, according to the second aspect of the invention, the structure of the contact means can be simplified.
(Claim 3)
The invention described in claim 3 has the following object in addition to the object of the invention described in claim 2 described above.

That is, the invention according to claim 3 is configured such that the protrusion does not hinder the insertion of the jig.
According to the third aspect of the present invention, the fitting state of the grommet and the pin, the seating state, or the seating position can be easily confirmed visually through the insertion groove of the jig.
(Claim 4)
The invention described in claim 4 has the following object in addition to the object of the invention described in claim 3 described above.

That is, the invention described in claim 4 is configured such that the insertion of the jig can be guided by the protrusion.
(Claim 5)
The invention described in claim 5 has the following object in addition to the object of the invention described in any one of claims 1 to 4.

That is, according to the fifth aspect of the present invention, the contact means can be formed between the divided leg portion of the grommet and the shaft portion of the pin.
(Claim 6)
The invention described in claim 6 has the following object in addition to the object of the invention described in any one of claims 1 to 5.

  That is, according to the sixth aspect of the present invention, a contact means can be formed between the flange portion of the grommet and the shaft portion of the pin.

Each invention described in each claim has been made to achieve each of the above-mentioned objects, and features of each invention will be described below using embodiments of the invention shown in the drawings. .
In addition, the code | symbol in parenthesis shows the code | symbol used in embodiment of invention, and does not limit the technical scope of this invention.
Also, the drawing numbers indicate the drawing numbers used in the embodiments of the invention and do not limit the technical scope of the present invention.
(Claim 1)
The invention described in claim 1 is characterized by the following points.

First, the push rivet (10) has the following configuration, for example, as shown in FIG.
(1) Grommet (40)
(2) Pin (50)
Secondly, the grommet (40) is constituted at least from the following configuration, for example, as shown in FIGS.

(3) Flange (60)
The flange part (60) is provided with an insertion hole (61) as shown in FIGS.
(4) Connecting leg (80)
As shown in FIGS. 1 to 4, for example, there are at least a pair of connecting legs (80), projecting upward from the flange (60), and connected to each other at the apex.

In addition, although the connection leg part (80) was formed as a pair, that is, two, it is not limited to this, and three or more may be formed.
(5) Split leg (90)
1 to 4, for example, there are at least a pair of split legs (90), and a slit (71) is formed between the pair of connecting legs (80) upward from the flange (60). It is designed to project.

In addition, although four division | segmentation leg parts (90) were formed, it is not limited to this, You may form a pair, ie, two, three, or five or more.
(6) Swelling part (91)
For example, as shown in FIGS. 3, 7 and 8, the bulging portion (91) projects inwardly of the connecting leg portion (80) and the split leg portion (90), and inwardly toward the tip end portion. It has a taper surface which inclines.

In addition, although a total of four bulging portions (91) are formed on each divided leg portion (90), it is not limited to this, and may be formed on the connecting leg portion (80) side, The number is not limited to four, but may be single, two, three, or five or more.
Thirdly, as shown in FIGS. 1 and 9 to 14, for example, the pin (50) is configured at least from the following configuration.

(7) Head (100)
For example, as shown in FIGS. 21 to 23, the head portion (100) is fitted to the flange portion (60).
(8) Shaft (110)
For example, as shown in FIGS. 1 and 9 to 12, the shaft portion (110) protrudes upward from the head portion (100).

(9) Concave groove (111)
The concave groove (111) is formed in the side portion of the shaft portion (110) as shown in FIGS. 1 and 9 to 12, for example, and is formed in the bulging portion (91) as shown in FIGS. 22 and 23, for example. By engaging, the connecting leg (80) and the split leg (90) are expanded in diameter.
Fourth, between the grommet (40) and the pin (50), for example, as shown in FIGS. 22 and 23, the flange (60) and the pin (50) The contact means (for example, the protrusion 65) for producing the clearance (120) is provided between the surface facing the head (100).

In addition, although the protrusion (65) was illustrated as a contact means, it is not limited to this. Further, the protrusion (65) is provided on the flange part (60) of the grommet (40), but is not limited thereto, and the split leg part (90) of the grommet (40) and the head part of the pin (50) ( 100) or at least one portion of the shaft portion (110).
(Claim 2)
The invention described in claim 2 is characterized by the following points in addition to the characteristics of the invention described in claim 1 described above.

That is, for example, as shown in FIGS. 1 to 3 and FIG. 5, the contact means is at least one of the facing surfaces of the flange portion (60) of the grommet (40) and the head portion (100) of the pin (50). This is a protrusion (65) provided on the surface.
Although the protrusion (65) is provided on the lower surface of the flange portion (60) of the grommet (40), it is not limited to this, and the upper surface of the head (100) of the pin (50) or the grommet (40) And the pin (50).
(Claim 3)
The invention described in claim 3 has the following features in addition to the features of the invention described in claim 2 described above.

First, the outer periphery of the flange portion (60) of the grommet (40) has the following configuration, for example, as shown in FIGS.
(1) Insertion groove (63)
For example, as shown in FIGS. 1 to 3 and FIG. 5, there are a plurality of insertion grooves (63), which are arranged radially around the insertion hole (61), and toward the insertion hole (61) (Not shown) can be inserted.

In addition, although the four insertion grooves (63) were provided, it is not limited to this, You may provide two, three, or five or more.
(2) Projection edge (64)
For example, as shown in FIGS. 1 to 3 and FIG. 5, there are a plurality of protruding edges (64), for example, as shown in FIGS. 22 and 23, located on both sides with the insertion groove (63) interposed therebetween, The outer periphery of the flange portion (60) is bordered, and the outer periphery of the head (100) of the pin (50) is fitted in the inner peripheral direction.

Although four protrusions (64) are provided, the present invention is not limited to this, and two, three, or five or more may be provided.
Second, the protrusion (65) is located between the protrusion edge (64) and the insertion hole (61) as shown in FIGS. It is formed one step higher than the projecting edge (64).
(Claim 4)
The invention described in claim 4 is characterized by the following points in addition to the characteristics of the invention described in claim 3 described above.

That is, the protrusion (65) gradually decreases the circumferential width of the flange (60) from the protrusion (64) toward the insertion hole (61) as shown in FIG. 5, for example. .
(Claim 5)
The invention described in claim 5 is characterized by the following points in addition to the characteristics of the invention described in any one of claims 1 to 4.

That is, although not shown, the contact means is provided on at least one of the opposing surfaces of the split leg portion (90) of the grommet (40) and the shaft portion (110) of the pin (50).
(Claim 6)
The invention described in claim 6 is characterized by the following points in addition to the features of the invention described in any one of claims 1-5.

  That is, although not shown, the contact means is provided on at least one of the facing surfaces of the flange part (60) of the grommet (40) and the shaft part (110) of the pin (50).

Since this invention is comprised as mentioned above, there exists an effect as described below.
(Claim 1)
According to invention of Claim 1, there exist the following effects.
That is, according to the first aspect of the present invention, a clearance capable of discharging foreign matters such as mud sand is formed between the flange part of the grommet and the head part of the pin in a state where the grommet is inserted into the pin. can do.

As a result, according to the first aspect of the present invention, mud sand and water easily flow down from the clearance, mud sand hardly accumulates between the flange part of the grommet and the head part of the pin, and the pin can be easily released. .
(Claim 2)
According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the following effect is obtained.

That is, according to the invention described in claim 2, the clearance can be generated by the protrusion.
As a result, according to the second aspect of the invention, the structure of the contact means can be simplified.
(Claim 3)
According to invention of Claim 3, in addition to the effect of invention of Claim 2, there exist the following effects.

That is, according to the third aspect of the present invention, the protrusion can prevent the insertion of the jig.
According to the third aspect of the present invention, the fitting state of the grommet and the pin, the seating state, or the seating position can be easily confirmed visually through the insertion groove of the jig.
(Claim 4)
According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, the following effect is obtained.

That is, according to the fourth aspect of the present invention, the insertion of the jig can be guided by the protrusion.
(Claim 5)
According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1-4, the following effect is provided.

That is, according to the fifth aspect of the present invention, the contact means can be formed between the divided leg portion of the grommet and the shaft portion of the pin.
(Claim 6)
According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 5, the following effect is provided.

  That is, according to the sixth aspect of the present invention, the contact means can be formed between the flange portion of the grommet and the shaft portion of the pin.

It is a perspective view of a push rivet. It is the front view which made half of a grommet the cross section. It is the side view which made the half of the grommet the cross section. It is a top view of a grommet. It is a bottom view of a grommet. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. It is a perspective view of a pin. It is the front view which made one half of a pin a section. It is the side view which made the half of the pin a cross section. It is a top view of a pin. It is a bottom view of a pin. It is sectional drawing which follows the DD line | wire of FIG. It is a side view of a grommet and a pin. It is sectional drawing of a grommet and a pin. It is other sectional drawing of a grommet and a pin. It is a perspective view of the state where a pin was temporarily fixed to a grommet. It is sectional drawing of the state which temporarily fixed the pin to the grommet. It is another side view of the state where the pin was temporarily fixed to the grommet. It is a perspective view of the state where the pin was finally fixed to the grommet. It is a side view of the state where the pin was finally fixed to the grommet. It is another side view of the state which fixed the pin to the grommet.

(Push rivet 10)
In FIG. 1, 10 is a push rivet, and the push rivet 10 is for attaching a component 30 such as a bumper or an under cover to a panel 20 such as an automobile body as shown in FIGS. It is.
As shown in FIGS. 22 and 23, the panel 20 is provided with a circular through hole 21 penetrating the front and back surfaces into which a support leg 70 described later of the push rivet 10 can be inserted.

As shown in FIGS. 22 and 23, a support leg 70, which will be described later, of the push rivet 10 can be inserted into the component 30, communicated with the through hole 21 of the panel 20, and circular communication holes 31 penetrating the front and back surfaces. Is provided.
In addition, although the body of the motor vehicle was illustrated as the panel 20 and the bumper and the under cover were illustrated as the component 30, it is not limited to these, and it is not limited to the object for motor vehicles.

As shown in FIG. 1, the push rivet 10 is roughly divided into the following parts.
The following (1) and (2) will be described later.
(1) Grommet 40
(2) Pin 50
The parts of the push rivet 10 are not limited to the above (1) and (2).
(Grommet 40)
As shown in FIGS. 22 and 23, the grommet 40 is inserted in series into the through hole 21 of the panel 20 and the communication hole 31 of the component 30 that are in communication with each other. The grommet 40 is expanded by inserting a pin 50 described later. In order to fix the panel 20 and the component 30 in a polymerized state. The grommet 40 is integrally formed of a synthetic resin having appropriate elasticity and rigidity, such as polyacetal (POM).

Specifically, as shown in FIGS. 1 to 8, the grommet 40 includes the following units when roughly divided.
The following (1) and (2) will be described later.
(1) Flange part 60
(2) Support leg 70
In addition, each part of the grommet 40 is not limited to the above (1) and (2).
(Pin 50)
As shown in FIGS. 22 and 23, the pin 50 is inserted into the grommet 40 to increase the diameter of the support leg 70 of the grommet 40. The pin 50 is integrally formed of a synthetic resin having appropriate elasticity and rigidity, such as polyethylene terephthalate (PBT).

Specifically, as shown in FIG. 1 and FIGS. 9 to 14, the pin 50 includes the following parts when roughly classified.
The following (1) and (2) will be described later.
(1) Head 100
(2) Shaft part 110
In addition, each part of the pin 50 is not limited to the above (1) and (2).
(Flange part 60)
As shown in FIGS. 1 to 5, the flange portion 60 is provided with an insertion hole 61.

Specifically, the flange portion 60 is formed in a disk shape, and its outer diameter is set larger than the inner diameter of the communication hole 31 of the component 30 as shown in FIGS.
The flange part 60 is provided with following each part, as shown to FIGS.
The following (1) to (5) will be described later.
(1) Insertion hole 61
(2) Guide protrusion 62
(3) Insertion groove 63
(4) Projection edge 64
(5) Projection 65 (contact means)
In addition, each part of the flange part 60 is not limited to above-mentioned (1)-(5).
(Insertion hole 61)
As shown in FIGS. 1 to 3 and 5, the insertion hole 61 is formed in a circular shape at the center of the flange portion 60 and penetrates vertically.
(Guide protrusion 62)
As shown in FIG. 5, a pair of guide protrusions 62 project from the inner edge of the insertion hole 61 so as to face each other, and fit into a guide groove 115 of the pin 50 described later.
(Insertion groove 63)
As shown in FIGS. 1 to 3 and 5, there are a plurality of, for example, four insertion grooves 63, which are arranged radially around the insertion hole 61. Can be inserted.

Although four insertion grooves 63 are provided at intervals of 90 degrees, the present invention is not limited to this, and two, three, or five or more may be provided.
(Edge 64)
As shown in FIGS. 1 to 3 and 5, there are a plurality of protrusions 64, for example, the same number of four as the insertion grooves 63, located on both sides of the insertion groove 63, and the outer periphery of the flange portion 60. As shown in FIGS. 21 to 23, the outer periphery of the head 100 of the pin 50 is fitted in the inner peripheral direction as well as being edged in an arc shape.

In addition, although the four protrusion parts 64 were provided at 90 degree intervals similarly to the insertion groove | channel 63, it is not limited to this, You may provide two, three, or five or more.
As shown in FIGS. 21 to 23, the inner diameter of the projecting edge portion 64 is set to be equal to or larger than the outer diameter of the head 100 of the pin 50 described later, and the height of the projecting edge portion 64 from the lower surface of the flange portion 60 is The thickness is set to be equal to or less than the thickness of 50 heads 100 so that the head 100 of the pin 50 fits inside the projecting edge portion 64.
Although the height of the protruding portion 64 is set to be equal to or less than the thickness of the head 100 of the pin 50, the present invention is not limited to this, and the height of the protruding portion 64 is set to the thickness of the head 100 of the pin 50. It may be set to a height exceeding.
(Projection 65)
1-3 and FIG. 5, the protrusion 65 is located between the protrusion 64 and the insertion hole 61, and is formed one step higher than the protrusion 64 toward the lower surface of the flange 60. Yes.

As shown in FIG. 5, the projecting portion 65 gradually decreases the circumferential width of the flange portion 60 from the projecting edge portion 64 toward the insertion hole 61. Specifically, the protrusion 65 has a flat pointed shape toward the center of the insertion hole 61 and has a fan shape, a mountain shape, or a triangular shape.
Although the outer periphery of the protrusion 65 is provided so as to be in contact with the inner periphery of the protrusion 64, the present invention is not limited to this, and both may be provided separately. Moreover, although the protrusion 65 formed the fan in the shape of a fan, a mountain, or a triangle, it is not limited to these shapes.

  The height of the protruding portion 65 from the lower surface of the flange portion 60 is set to be lower than the height of the protruding edge portion 64. For example, when the diameter of the flange portion 60 is “18 mm” and the thickness from the upper surface to the lower surface of the flange portion 60 is “1.8 mm”, the distance from the upper surface of the flange portion 60 to the lower surface of the projecting edge portion 64 is set. The thickness is set to “3.1 mm”, and the thickness from the upper surface of the flange portion 60 to the protrusion 65 is set to “2.1 mm”.

Therefore, the height of the protruding portion 64 from the lower surface of the flange portion 60 is “1.3 mm”, and the height of the protruding portion 65 from the lower surface of the flange portion 60 is “0.3 mm”. The difference in height between the portion 64 and the protrusion 65 is “1.0 mm”.
That is, a clearance of “0.3 mm” is provided between the lower surface of the flange portion 60 and the upper surface of the head portion 100 of the pin 50 when the lower surface of the protrusion 65 and the upper surface of the head portion 100 of the pin 50 contact each other. 120 occurs, and the protrusion 65 functions as a contact means.

The contact means will be described later. The above numerical values are merely examples, and are not limited to these numerical values.
(Support leg 70)
As shown in FIGS. 1 to 4, the support leg 70 protrudes upward from the flange portion 60, and its outer diameter is set to be equal to or smaller than the inner diameter of the through hole 21 of the panel 20 and the communication hole 31 of the component 30. Yes.

Specifically, the support leg 70 has the following parts as shown in FIGS.
The following (1) and (2) will be described later.
(1) Connecting leg 80
(2) Split leg 90
In addition, each part of the support leg 70 is not limited to the above (1) and (2).
(Linking leg 80)
As shown in FIGS. 1 to 4, there are at least a pair of connecting legs 80, projecting upward from the flange 60, and connected to each other at the apex.

In addition, although the connection leg part 80 was formed in a pair, ie, two, it is not limited to this, You may form three or more.
The connecting leg portion 80 is formed in a plate shape, bends in a substantially V shape in the direction of approaching from the middle of the height, and is connected in a substantially V shape or mountain shape having a pointed tip at the apex.
Specifically, as shown in FIGS. 1-4, the connection leg part 80 is provided with following each part.

In addition, each part of the connection leg part 80 is not limited to following (1) and (2).
(1) One half 81
As shown in FIGS. 1 to 4, the half part 81 is divided into two by two opposing slits 71 among four slits 71 described later, and there are a total of four.
(2) Vertex connecting part 82
As shown in FIGS. 1 to 4, the vertex connecting portion 82 connects all the vertices of the four half halves 81, and is formed in a substantially V-shaped or mountain shape with a sharp point.
(Split leg 90)
As shown in FIGS. 1 to 4, the split leg portion 90 has at least a pair, and protrudes upward from the flange portion 60 so as to form a slit 71 between the pair of connecting leg portions 80. It is.

The divided leg portion 90 is formed in a substantially cylindrical shape as a whole, and the hollow interior communicates with the insertion hole 61 of the flange portion 60. The divided leg 90 is divided into four pieces in the vertical direction by four slits 71.
In addition, although the four division | segmentation leg parts 90 were formed, it is not limited to this, You may form a pair, ie, 2, 3, or 5 or more. Further, although four slits 71 are formed, the present invention is not limited to this, and two, three, or five or more slits 71 may be formed.

Specifically, the division | segmentation leg part 90 is provided with following each part, as shown to FIGS.
In addition, each part of the division | segmentation leg part 90 is not limited to following (1) and (2).
(1) Slit 71
As shown in FIGS. 1 to 4, the open bottom surface of the four slits 71 is open to the insertion hole 61 of the flange portion 60. Of the four slits 71, the two back slits 71 extend upward, and the connecting leg portion 80 is divided into two half portions 81.

Of the four slits 71, the two back-facing slits 71 extending to the connecting leg portion 80 are open upward from the upper end portion of the split leg portion 90 to the upper side of the connecting leg portion 80. The part opens to the insertion hole 61 of the flange part 60.
Of the four slits 71, the two short-facing slits 71 have an upper end opened to the upper end of the split leg portion 90 and a lower end opened to the insertion hole 61 of the flange portion 60.

For this reason, it has a structure in which foreign matters such as mud sand and muddy water are easily discharged or drained toward the outside of the grommet 40 through the four slits 71.
(2) The bulging part 91
As shown in FIGS. 7 and 8, the bulging portion 91 protrudes inward from the connecting leg portion 80 and the split leg portion 90, and has a tapered surface that inwardly inclines toward the distal end portion. .

In addition, although the total four bulging portions 91 are formed on each divided leg portion 90, the bulging portion 91 is not limited to this, and may be formed on the connecting leg portion 80 side, and the number is also limited to four. Alternatively, a single unit, two units, three units, or five or more units may be formed.
(Head 100)
As shown in FIGS. 21 to 23, the head 100 is fitted to the flange portion 60.

As shown in FIGS. 1 and 9 to 13, the head portion 100 is formed in a disk shape so that the head portion 100 of the pin 50 fits inside the protruding edge portion 64 of the flange portion 60.
(Shaft 110)
As shown in FIG. 1 and FIGS. 9 to 12, the shaft portion 110 protrudes upward from the head 100.

As shown in FIGS. 15 to 23, the shaft portion 110 is set to have a total length longer than the total length of the divided leg portion 90.
Specifically, as shown in FIGS. 1 and 9 to 12, the shaft part 110 includes the following parts.
The following (1) to (6) will be described later.
(1) Groove 111
(2) Corner 112
(3) Notch 113
(4) Step 114
(5) Guide groove 115
(6) Cavity 116
In addition, each part of the axial part 110 is not limited to above-mentioned (1)-(6).
(Concave groove 111)
The concave groove 111 is formed on the side portion of the shaft portion 110 as shown in FIGS. 1 and 9 to 12, and is engaged with the bulging portion 91 as shown in FIGS. The diameter of the portion 80 and the split leg 90 is increased.

The concave groove 111 is formed on each of the four sides of the shaft portion 110 and is concave.
When the pin 50 is inserted into the grommet 40, the bulging portions 91 of the four divided leg portions 90 engage with the concave groove 111, as shown in FIGS. That is, when the pin 50 is inserted deeply, the bulging portion 91 rides on the concave groove 111, and the outer diameter of the connecting leg portion 80 increases.
(Corner 112)
As shown in FIGS. 18 and 21, the corner portion 112 is slidably fitted into the four slits 71 of the flange portion 60.

As shown in FIGS. 1, 9 to 12, and 14, the corner portion 112 is located at four corners of the shaft portion 110 and is formed in a column shape.
For this reason, it has a structure in which foreign matters such as mud sand and muddy water are easily discharged or drained from the gap between the corner portions 112 toward the outside of the shaft portion 110.
(Notch 113)
As shown in FIG. 1 and FIGS. 9 to 12, the notch 113 is formed in the two concave grooves 111 that face backward out of the four concave grooves 111, and is formed from the tip end portion of the shaft portion 110. It is recessed one step lower than the bottom of the groove 111.

  When the pin 50 is inserted into the grommet 40, the bulging portions 91 of the four divided leg portions 90 engage with the notch 113, respectively. That is, when the pin 50 is inserted deeply, the bulging portion 91 rides on the two concave grooves 111 facing away from each other without the notch portion 113, and the two divided leg portions 90 of the two divided leg portions 90 are opposed to each other. The leg 90 is first expanded. At this time, the bulging portions 91 of the remaining two divided leg portions 90 are located at the notch portions 113.

Further, when the pin 50 is inserted, the bulging portion 91 located at the notch 113 rides on the two concave grooves 111 facing the notch 113, and the remaining two split legs 90 are delayed. To expand the diameter.
For this reason, since the diameter of the four divided leg portions 90 can be increased at different timings in a set of two, the insertion force of the pin 50 can be reduced.
(Step 114)
As shown in FIGS. 1 and 9 to 11, the stepped portion 114 is formed in two concave grooves 111 having a notch 113, is adjacent to the notch 113, and is one step higher than the bottom of the concave groove 111. .

The bulging portion 91 of the flange portion 60 contacts the concave groove 111. However, when the shaft portion 110 is inserted into the hollow interior of the split leg portion 90 through the insertion hole 61 of the flange portion 60, the bulging portion 91 is notched 113. Abut. When the shaft portion 110 is inserted further deeper, the bulging portion 91 rides on the stepped portion 114, and the outer diameter of the divided leg portion 90 is increased. Further, when the shaft portion 110 is inserted, the bulging portion 91 that has been riding on the stepped portion 114 falls to the bottom of the recessed groove 111 that is lowered by one step, and at this time, a click feeling is generated, and the bulging portion 91 is Abutting on the stepped portion 114 that is raised by one step, the sliding of the shaft portion 110 in the removal direction is prevented.
(Guide groove 115)
As shown in FIGS. 1, 9 to 11, and 14, the guide grooves 115 are formed in the corner portions 112, respectively, and slidably fit into the guide protrusions 62 protruding into the insertion holes 61 of the flange portion 60.

The guide groove 115 extends upward from directly above the upper surface of the head portion 100, and an upper end portion of the guide groove 115 stops halfway along the axial length of the shaft portion 110. The upper end portion of the guide groove 115 having a dead end prevents the head portion 100 from coming out of the insertion hole 61 of the flange portion 60.
That is, the guide groove 115 and the guide protrusion 62 are for holding the shaft portion 110 of the pin 50 in a temporarily fixed state in which the shaft portion 110 of the pin 50 is partially inserted into the insertion hole 61 of the grommet 40, as shown in FIGS. .
(Cavity 116)
As shown in FIG. 11, the hollow portion 116 penetrates in the lateral direction of the shaft portion 110, and opens into the concave grooves 111 whose both ends are facing away from each other. Two hollow portions 116 are located right above the flange portion 60 and are provided side by side in the lateral direction.

For this reason, it has a structure in which foreign matters such as mud sand and muddy water are easily discharged or drained through the hollow portion 116 toward the outside of the shaft portion 110.
(Contact means)
The contact means is located between the grommet 40 and the pin 50 and, as shown in FIG. 22 and FIG. 23, between the opposing surfaces of the flange portion 60 of the grommet 40 and the head portion 100 of the pin 50 in the final stop state. This is for generating a clearance 120.

In addition, although the protrusion 65 was illustrated as a contact means, it is not limited to this. Moreover, although the protrusion 65 was provided in the flange part 60 of the grommet 40, it is not limited to this, and it may be provided in one or more places of the split leg part 90 of the grommet 40, the head 100 of the pin 50, and the shaft part 110. good.
That is, the contact means can have the following modes.
In addition, the aspect of a contact means is not limited to following (1)-(3).
(1) The aspect provided in at least one of the opposing surfaces of the flange part 60 of the grommet 40 and the head part 100 of the pin 50 For example, as shown in FIGS. 1-3 and FIG. Although not shown, the flange portion 60 may be provided on the upper surface of the head 100 of the pin 50, or may be provided on both surfaces.

(2) A mode in which the later-described split leg 90 of the grommet 40 is provided on at least one of the facing surfaces of the shaft 50 of the pin 50. For example, although not shown, the protrusion is formed on the split leg 90 of the grommet 40. It may be provided on the inner peripheral surface, provided on the outer peripheral surface of the shaft portion 110 of the pin 50, or provided on both surfaces.
(3) A mode in which the flange portion 60 of the grommet 40 and the shaft portion 110 of the pin 50 are provided on at least one of the facing surfaces For example, although not shown, a protrusion is provided on the upper surface of the flange portion 60 of the grommet 40 The pin 50 may be provided on the outer peripheral surface of the shaft portion 110, or may be provided on both surfaces.
(How to use push rivet 10)
Next, a method for using the push rivet 10 having the above-described configuration will be described.
(Temporary fixing)
First, as shown in FIGS. 18 to 20, the pin 50 is inserted into the grommet 40 and temporarily fixed.

Note that the support leg 70 of the grommet 40 may be inserted independently into the through hole 21 of the panel 20 and the communication hole 31 of the component 30 that are in communication with each other, and then the pin 50 may be inserted.
First, as shown in FIGS. 18 to 20, the pin 50 is inserted so that its shaft portion 110 is aligned with the insertion hole 61 of the flange portion 60 of the grommet 40.
When the shaft portion 110 is inserted, the tip portion thereof advances toward the hollow interior of the divided leg portion 90 through the insertion hole 61.

At this time, the four corners 112 of the shaft part 110 fit into the four slits 71 of the flange part 60.
When the shaft portion 110 is further inserted, the two guide protrusions 62 projecting into the insertion hole 61 of the flange portion 60 are inserted into the two guide grooves 115 out of the guide grooves 115 of the four corner portions 112. Due to the elastic force on the part 112 side, it snaps in.

When the guide protrusion 62 fits into the guide groove 115, the upper end portion of the guide groove 115 is a dead end, so that the shaft portion 110 cannot be removed from the insertion hole 61 of the flange portion 60, and the pin 50 is temporarily attached to the grommet 40. Stopped.
(This stop)
Next, as shown in FIGS. 19 and 20, the support leg 70 of the grommet 40 with the pin 50 temporarily fixed is sequentially inserted into the through hole 21 of the panel 20 through the communication hole 31 of the component 30.

Thereafter, the pin 50 is inserted deeper into the grommet 40 as shown in FIGS.
When the pin 50 is inserted, the bulging portions 91 of the four divided leg portions 90 ride on the four concave grooves 111, respectively, and the outer diameter of the four divided leg portions 90 increases above the panel 20. Diameter.
For this reason, the panel 20 and the component 30 are sandwiched and held between the four divided leg portions 90 having an enlarged diameter and the upper surface of the flange portion 60 of the grommet 40, and the component 30 is attached to the panel 20 via the push rivet 10. Fixed.

At this time, the bulging portion 91 of the split leg 90 gets over the stepped portion 114 of the shaft portion 110 of the pin 50 and falls to the bottom of the recessed groove 111 that is lowered by one step, and a click feeling is generated at this time. The bulging portion 91 comes into contact with the stepped portion 114 that is raised one step higher, so that the sliding of the shaft portion 110 in the removal direction is prevented, and the pin 50 is locked to the grommet 40 in the fully stopped state.
In this fully-fastened state, the head 100 of the pin 50 snaps into the inner peripheral side of the protruding edge portion 64 of the flange portion 60 of the grommet 40 as shown in FIGS.

At this time, as shown in FIGS. 22 and 23, the upper surface of the head portion 100 of the pin 50 abuts on the lower surface of the protrusion 65 of the flange portion 60, and the upper surface of the head portion 100 of the pin 50 and the lower surface of the flange portion 60. Clearance 120 occurs between the two.
For this reason, foreign substances such as mud sand and muddy water can be discharged or drained to the outside through the clearance 120.

As a result, foreign matter such as mud sand hardly accumulates between the upper surface of the head portion 100 of the pin 50 and the lower surface of the flange portion 60.
(Removal of part 30)
When removing the part 30, insert a jig such as a flathead screwdriver (not shown) from the insertion groove 63 of the flange part 60 of the grommet 40 in a direction to separate the head part 100 of the pin 50 from the flange part 60. Just move.

When the head portion 100 of the pin 50 is moved away from the flange portion 60, the shaft portion 110 of the pin 50 moves away from the insertion hole 61 of the flange portion 60. At this time, the split leg portion 90 bulges. Part 91 is
Riding on the stepped portion 114 that is one step higher than the concave groove 111 of the shaft portion 110 of the pin 50, the locked state is released.
After that, when holding the head portion 100 of the pin 50 and moving the shaft portion 110 in a direction to come out from the insertion hole 61 of the flange portion 60, the split leg portion 90 that has ridden in the groove 111 of the shaft portion 110 bulges. The portion 91 is separated from the concave groove 111. For this reason, the split leg 90 is reduced in diameter to the original outer diameter by the elasticity of the connecting leg 80 in addition to its own elasticity.

Therefore, the support leg 70 of the grommet 40 can be removed from the through hole 21 of the panel 20, and the component 30 can be removed from the through hole 21.
Although the lock is released using a jig, it is also possible to release the lock by inserting a fingernail into the insertion groove 63 without using a jig.

10 Push rivets
20 Panel (body) 21 Through hole
30 Parts 31 Communication hole
40 Grommet 50 pins
60 Flange
61 Insertion hole 62 Guide protrusion
63 Insertion groove 64 Projection edge
65 Projection (contact means)
70 Support leg 71 Slit
80 Connecting legs
81 Half part 82 Vertex connection part
90 Split leg 91 Bump
100 heads 110 shafts
111 concave groove 112 corner
113 Notch 114 Step
115 Guide groove 116 Cavity
120 clearance

Claims (6)

A flange portion provided with an insertion hole,
At least a pair of connecting legs protruding upward from the flange and connected to each other at the apex;
From the flange portion upward, at least a pair of split legs projecting so as to form a slit between the pair of connecting legs, and in the internal direction of the connecting legs and the split legs A grommet that is provided at least from a bulging portion that protrudes and has a tapered surface that inwardly slopes toward the tip.
A head that fits into the flange,
A shaft projecting upward from the head,
In a push rivet that is formed on a side portion of the shaft portion and has a pin formed at least from a concave groove that expands the diameter of the connecting leg portion and the divided leg portion by engaging with the bulging portion,
Between the grommet and the pin,
A push rivet comprising contact means for generating a clearance between opposing surfaces of the flange portion of the grommet and the head portion of the pin in the final stop state. The contact means includes
2. The push rivet according to claim 1, wherein the push rivet is a protrusion provided on at least one of surfaces facing the flange portion of the grommet and the head portion of the pin. On the outer periphery of the flange part of the grommet,
A plurality of insertion grooves that are arranged radially around the insertion hole and into which a jig can be inserted toward the insertion hole;
A plurality of protruding edge portions that are located on both sides of the insertion groove, border the outer periphery of the flange portion, and fit the outer periphery of the head of the pin in the inner peripheral direction;
The protrusion is
The push rivet according to claim 2, wherein the push rivet is located between the protruding edge portion and the insertion hole, and is formed one step higher than the protruding edge portion toward the lower surface of the flange portion. The protrusion is
4. The push rivet according to claim 3, wherein a circumferential width of the flange portion is gradually reduced from the protruding portion toward the insertion hole. 5. The contact means includes
The push rivet according to any one of claims 1 to 4, wherein the push rivet is provided on at least one of the opposing surfaces of the split leg portion of the grommet and the shaft portion of the pin. The contact means includes
The push rivet according to any one of claims 1 to 5, wherein the push rivet is provided on at least one of opposing surfaces of the flange portion of the grommet and the shaft portion of the pin.

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