WO2012036071A1

WO2012036071A1 - Push rivet

Info

Publication number: WO2012036071A1
Application number: PCT/JP2011/070517
Authority: WO
Inventors: 清嗣原田
Original assignee: 株式会社ニフコ
Priority date: 2010-09-14
Filing date: 2011-09-08
Publication date: 2012-03-22
Also published as: JP5680915B2; JP2012062922A

Abstract

In this push rivet, a grommet is configured from at least a flange section, a coupling leg section, a split leg section, and a swelling section. A pin is configured from at least a head section, a shaft section, and a concave groove that is formed on the side of the shaft section and that expands the coupling leg section and the split leg section by means of engaging the swelling section. A contact means (e.g. a protruding section) for generating clearance between the facing surfaces of the flange section of the grommet and the head section of the pin while in a main fastened state is provided between the grommet and the pin.

Description

Push rivet

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 the 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).

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, the present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to provide a flange portion of the grommet and the head of the pin in the fixed state where the grommet is inserted into the pin. The foreign matter such as mud sand and muddy water can be discharged or drained through the clearance generated between the two parts.

The present invention has been made to achieve the above object, and the present invention is characterized by the following points.

First, the push rivet has the following configuration.
(1) Grommet (2) Pin Secondly, the grommet is composed of at least the following structure.

(3) Flange part The flange part is provided with an insertion hole.
(4) Connection leg part There are at least one pair of connection leg parts, projecting upward from the flange part, and connected to each other at the apex.

In addition, although the connection leg part was formed in a pair, ie, two, it is not limited to this, You may form three or more.
(5) Divided leg part There are at least one pair of divided leg parts, and protrudes upward from the flange part so as to form a slit between the pair of connecting leg parts.

In addition, although four division | segmentation leg parts were formed, it is not limited to this, You may form a pair, ie, two pieces, three pieces, or five pieces or more.
(6) The bulging portion The bulging portion has a tapered surface that protrudes inwardly of the connecting leg portion and the split leg portion and is inclined inwardly toward the distal end portion.

In addition, although a total of four bulging portions are formed on each divided leg portion, the bulging portion is not limited to this, and may be formed on the connecting leg portion side, and the number is not limited to four. Two, three, or five or more may be formed.
Thirdly, the pin is composed at least of the following configuration.

(7) Head The head is fitted to the flange.
(8) Shaft part The shaft part protrudes upward from the head.

(9) Concave groove The concave groove is formed in the side part of the shaft part, and expands the diameter of the connecting leg part and the split leg part by engaging with the bulging part.
Fourthly, contact means (for example, a protrusion) for generating a clearance is provided between the grommet and the pin between the opposed surfaces of the flange part of the grommet and the head part of the pin in the fixed state. Yes.

In addition, although the protrusion was illustrated as a contact means, it is not limited to this. Moreover, although the protrusion was provided in the flange part of the grommet, it is not limited to this, You may provide in one or more places of the division leg part of a grommet, the head part of a pin, and a shaft part.
The present invention may be characterized by the following points.

That is, the contact means is a protrusion provided on at least one of the facing surfaces of the flange portion of the grommet and the head portion of the pin.
In this aspect, the clearance can be generated by the protrusion. As a result, the structure of the contact means can be simplified.
In addition, although the protrusion was provided in the lower surface of the flange part of a grommet, it is not limited to this, You may provide in both the upper surface of the head of a pin, or both a grommet and a pin.
The present invention may be characterized by the following points.

1stly, it has the following structure in the outer periphery of the flange part of a grommet.
(1) Insertion groove There are a plurality of insertion grooves, which are arranged radially around the insertion hole, and a jig can be inserted toward the insertion hole.

In addition, although the four insertion grooves were provided, it is not limited to this, You may provide two, three, or five or more.
(2) Protruding edge There are a plurality of protruding edges, which are located on both sides of the insertion groove, rim the outer periphery of the flange portion, and the outer periphery of the pin head fits in the inner peripheral direction.

Although four protruding edges are provided, the present invention is not limited to this, and two, three, or five or more may be provided.
Second, the protrusion is positioned between the protrusion and the insertion hole, and is formed one step higher than the protrusion toward the lower surface of the flange portion.
In this aspect, it is possible to prevent the protrusion from obstructing the insertion of the jig. Further, 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.
The present invention may be characterized by the following points.

That is, the protrusion gradually decreases the circumferential width of the flange portion from the protrusion edge toward the insertion hole.
In this aspect, the insertion of the jig can be guided by the protrusion.
The present invention may be characterized by the following points.

That is, the contact means is provided on at least one of the opposing surfaces of the grommet split leg portion and the pin shaft portion.
In this aspect, the contact means can be formed between the split leg portion of the grommet and the shaft portion of the pin.
The present invention may be characterized by the following points.

That is, the contact means is provided on at least one of the facing surfaces of the flange portion of the grommet and the shaft portion of the pin.
In this aspect, the contact means can be formed between the flange portion of the grommet and the shaft portion of the pin.

Since the present invention is configured as described above, a clearance capable of discharging foreign matter such as mud sand is provided between the flange part of the grommet and the head part of the pin in the state where the grommet is inserted into the pin. Can be formed. As a result, mud sand and water easily flow down from the clearance, 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.

It is a perspective view of a push rivet in one embodiment of the present invention. It is the front view which made the half of the grommet in one Embodiment of this invention 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. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 5 is a sectional view taken along line BB in FIG. 4. FIG. 5 is a cross-sectional view taken along the line CC in FIG. 4. It is a perspective view of a pin in one embodiment of the present invention. 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 parts 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.
As shown in FIGS. 1 to 8, the flange portion 60 includes the following portions.
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)
Each part of the flange part 60 is not limited to the above (1) to (5).
(Insertion hole 61)
As shown in FIGS. 1 to 3 and 5, the insertion hole 61 is formed in a circle 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 protruding edges 64, for example, four pieces, for example, the same number 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.

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.
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 portion 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)
As shown in FIGS. 1 to 3 and 5, the protrusion 65 is located between the protrusion edge portion 64 and the insertion hole 61, and is formed one step higher than the protrusion edge portion 64 toward the lower surface of the flange portion 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 projecting portion 65 from the lower surface of the flange portion 60 is set to be lower than the height of the projecting 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, protruding 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, the connecting leg portion 80 includes the following portions as shown in FIGS.

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 out of four slits 71 to be 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, there are at least a pair of split leg portions 90 that project upwardly 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, as shown in FIGS. 1 to 4, the split leg 90 includes the following parts.
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 surfaces of the four slits 71 are open to the insertion holes 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)
The head 100 is fitted into the flange 60 as shown in FIGS.

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

As shown in FIGS. 15 to 23, the shaft 110 is set to have a total length longer than the total length of the split leg 90.
Specifically, as shown in FIG. 1 and FIGS. 9 to 12, the shaft part 110 includes the following parts.
The following (1) to (6) will be described later.
(1) Concave groove 111
(2) Corner 112
(3) Notch 113
(4) Step 114
(5) Guide groove 115
(6) Cavity 116
Each part of the shaft part 110 is not limited to the above (1) to (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 split 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.
The mode of the contact means is not limited to the following (1) to (3).
(1) A mode in which 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 is provided. For example, the protrusion 65 is formed on the grommet 40 as shown in FIGS. 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 into the pin 50 in accordance 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 locked state, the head portion 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. The portion 91 rides on the stepped portion 114 that is one step higher than the recessed groove 111 of the shaft portion 110 of the pin 50, and 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.

The entire contents of the specification, claims, drawings and abstract of Japanese Patent Application No. 2010-205807 filed on Sep. 14, 2010 are incorporated herein as the disclosure of the specification of the present invention. Is.

Claims

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 surfaces facing the flange portion of the grommet and the shaft portion of the pin.