JPH09317743A - Fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fastener such as a blind nut which does not generate whitening in fastening to a member made of a soft material nor damage in the case of strong fastening. SOLUTION: A blind nut 13 is a metal integrated molding composed of a female screw par 14, a tubular part 15 continued from the female screw part, and a flange 17 formed on an end of the tubular part. A longitudinally extending slit 18 is formed on the tubular part 15. A circumferential groove 19 is formed on an outer peripheral surface of the tubular part 15 near the female screw part 14. The tubular part 15 is buckled and deformed under the state that the tubular part 15 is inserted into a hole of a member to be installed. It is fastened to the member by means of the buckled/deformed part and the flange 17. When the female screw part 14 is pulled up to the side of thef lange 17, the tubular part 15 begins to bend from the portion around the circumferential groove 19. A buckling point 26 is dislocated to the side of the female screw 14 from an intermediate position. A buckled portion of the tubular part 15 is prevented from press-contacting with the surface of the member to be installed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blind nut type fastener or a rivet bolt type fastener made of metal which can be fastened to a member to be attached such as a panel from one direction.

[0002]

2. Description of the Related Art An internal thread part, a tubular part following the internal thread part,
A flange formed at an end of the tubular portion, and the tubular portion is buckled and deformed in a state where the tubular portion is inserted into the hole of the mounted member, and the buckling deformed portion and the flange are fastened to the mounted member. The metal blind nut configured as described above is well known, and is disclosed, for example, in Japanese Utility Model Laid-Open No. 59-146607. Since the blind nut can be worked from one direction, it is convenient to fasten it to a member that cannot be reached on the back side, for example, a mounted member such as a body panel. A bolt can be screwed into the blind nut fastened to the mounted member, and a member such as a decorative member can be mounted on the mounted member by screwing the bolt.

An example of a rivet bolt type fastener is disclosed in Japanese Laid-Open Patent Publication No.
It is disclosed in JP-A-2-242112. The fastener includes a tubular portion, a flange formed at one end of the tubular portion,
The mandrel, which penetrates the inside of the tubular part and has one end protruding from the flange and the other end fixed to the other end of the tubular part, buckles the tubular part with the tubular part inserted into the hole of the mounted member. It is configured to be deformed and fastened to the member to be attached by the buckling deformation portion and the flange, and the mandrel is formed with a male screw. The fastener can be fastened to a mounted member such as a panel from one direction so as to extend toward the front side, and after fastening, as a bolt erected on the mounted member, by screwing a nut from one direction, a fastener such as a decorative member is attached. The member can be attached to the attached member.

In fastening fasteners such as blind nuts, when the attached member is a hard material such as metal, it can be attached by strong fastening. However, when the attached member is a soft material such as plastic, if the fastener is attached with a strong fastening force, the attached member may be damaged. For this reason, there is a blind nut devised so that it can be fastened even if the mounted member is a soft material such as plastic.
Japanese Utility Model Publication No. 3-13607 discloses an example thereof. A vertical slit or groove is formed in the tubular part of the blind nut, and when the fastener is fastened, the slit part easily causes buckling, and even if the attached member is a soft material, it is attached to a panel or the like. The blind nut can be securely fastened without damaging the member.

A conventional blind nut is shown in FIGS.
This will be described with reference to FIG. The blind nut 1 comprises an internal thread part 2, a tubular part 3 following the internal thread part 2, and a flange 5 formed at the end of the tubular part 3, and a slit 6 extending in the longitudinal direction is formed in the tubular part 3. There is. As is well known, in the fastening operation of the blind nut 1, with the tubular portion 3 inserted into the hole of the mounted member such as the body panel,
The female screw portion 2 is pulled upward by the fastening tool or the like. By this pulling up, as shown in FIG. 2, the bending point 7 of the tubular portion 3 projects outward, and the tubular portion 3 is buckled and deformed around this bending point. Due to the existence of the slit 6, this buckling deformation can be performed with a weak pulling force, that is, a fastening force. Even if the mounted member is a soft material such as plastic, the blind nut can be mounted without damage to the mounted member. Can be securely fastened.

[0006]

However, the above-mentioned conventional blind nut has some points to be improved. For example, if the attached member is a thermoplastic (eg, ABS,
PP), the buckling part is crimped to the mounted member,
The plastic part becomes white. This is shown in FIG. In FIG. 3, the blind nut 1 includes the flange 5 and the buckling portion 9 of the tubular portion 3 for attaching the member 1 to be attached.
0. In this fastening, the buckling portion 9 comes into contact with the mounted member 10 and strongly presses that portion. When the mounted member is a thermoplastic, this pressing causes a whitened portion 11 on the pressing surface of the mounted member 10,
Not preferred. Apart from this, in the case of a thermosetting plastic (for example, FRP, SMC) mounted member, there is no problem of whitening because it is a material that is difficult to whiten. However, when the bolt is screwed into the blind nut 1 to attach another member, if the bolt is strongly tightened to the blind nut, the buckling portion 9 of FIG. There is a risk of damaging the part. Further, the blind nut 1 has a low fastening force to the attached member due to the fastening force for the soft material, and the blind nut may slip on the attached member due to the tightening of the bolt. A blind nut in which a triangular protrusion is simply formed on the surface of the tubular portion that contacts the mounted member or the surface of the flange that contacts the mounted member is disclosed in Japanese Utility Model Laid-Open No. 58-186208. There is no ingenuity for fastening to the mounted member.

Therefore, an object of the present invention is to prevent a whitening upon fastening to a member to be attached made of a soft material, and to damage the member to be attached even in strong fastening when attaching another member to the member to be attached. Another object of the present invention is to provide a fastener such as a blind nut or a blind rivet that can be fastened without slipping on the mounted member.

[0008]

According to the present invention, there is provided an internal thread portion, a tubular portion following the internal thread portion, and a flange formed at an end portion of the tubular portion.
The tubular portion is configured to be buckled and deformed in a state where the tubular portion is inserted into the hole of the mounted member, and the tubular portion is fastened to the mounted member by the buckling deformed portion and the flange. There is provided a blind nut having a slit extending in the longitudinal direction, wherein a peripheral groove is formed on an outer peripheral surface of the tubular portion near the female screw portion.

[0009]

In the blind nut, when the female screw portion is pulled up toward the flange side, the tubular portion first begins to bend from the peripheral groove portion, whereby the bending point is closer to the female screw portion than the intermediate position in FIG. It shifts. Due to this shift, the buckling portion of the tubular portion is not pressed against the surface of the mounted member, and the thermoplastic is not whitened. Further, even if the bolt is strongly screwed into the blind nut, the buckling portion is not deformed and crimped away from the surface of the mounted member, so that the mounted member can be prevented from being damaged.

According to the present invention, it is possible to form a knurled groove on the surface of the tubular portion of the blind nut which comes into contact with the member to be attached. Further, the protrusion means can be formed on the surface of the flange that contacts the member to be attached. The knurled groove and the projection means prevent the blind nut from slipping on the mounted member.

According to the present invention, the tubular portion, the flange formed at one end of the tubular portion, and the inside of the tubular portion are penetrated, one end projects from the flange, and the other end is the other end of the tubular portion. And a mandrel fixed to the mounting member, so that the tubular portion is buckled and deformed in a state where the tubular portion is inserted into the hole of the mounted member, and the buckling deformed portion and the flange are fastened to the mounted member. A blind rivet having a male thread formed on the mandrel, wherein the tubular portion is formed with a slit extending in the longitudinal direction, and the end portion of the tubular portion to which the mandrel is fixed. Provided is a blind rivet characterized in that a peripheral groove is formed on the outer peripheral surface in the vicinity thereof. In this blind rivet, the buckling deformation of the tubular portion due to the tightening of the nut means screwed onto the mandrel begins to bend from the circumferential groove portion of the tubular portion, and the bending point of the end portion where the mandrel is fixed from the center position It shifts to the side. Due to this misalignment, the buckling part of the tubular part will not be pressed against the surface of the mounted member, whitening of the thermoplastic will not occur, and even if the nut is strongly screwed to the mandrel, Since the bent portion deforms away from the surface of the mounted member, damage to the mounted member can be prevented.

Also in the case of the blind rivet described above, a knurled groove can be formed on the surface of the tubular portion that contacts the mounted member, and a protrusion means is formed on the surface of the flange that contacts the mounted member. can do. The blind rivet can prevent slipping on the member to be attached by these knurled grooves and protrusion means.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
This will be described with reference to the drawings. FIG. 4 shows a blind nut 13 which is a fastener according to the first embodiment of the present invention. The blind nut 13 is made of a metal integrally-molded product, and has an internal thread portion 14, a thin tubular portion 15 that extends upward from the internal thread portion 14, and a large-diameter flange 17 formed at the end of the tubular portion 15. And is formed as a hollow cylindrical body. The tubular portion 15 is formed to be thinner than the female screw portion 14, and can be buckled and deformed so as to project outward when inserted into a hole of a member to be attached such as a body panel. In order to promote this buckling deformation, the tubular portion 1
5, slits 18 extending in the longitudinal direction are formed. The slit 18 is, for example, as illustrated, the tubular portion 1
It is preferable that a plurality of (4 in the illustrated example) 5 are formed at equal intervals on the outer peripheral surface of 5. Further, in the present invention, the peripheral groove 19 is formed on the outer peripheral surface of the tubular portion 15 at a position adjacent to the upper end of the female screw portion 14. The circumferential groove 19 defines the position where the tubular portion 15 begins to bend when the female screw portion 14 is pulled up to the flange 17 side to buckle and deform the tubular portion 15. Therefore, the circumferential groove 19 is the tubular portion 15
May extend over the entire outer peripheral surface of the above, or may be a partial circumferential groove extending within an appropriate range.

FIG. 5 shows a blind nut 21 according to a second embodiment of the present invention. Blind nut 2
1, the knurled groove 2 is formed on the outer peripheral surface of the tubular portion 15.
2 is formed. The blind nut 21 has the same configuration as the blind nut 13 of FIG. 4 except that the knurled groove 22 is formed. This knurled groove 22
Prevents the blind nut 21 from slipping with respect to the member to be attached when the blind nut is fastened to the member to be attached such as a panel and then the bolt is screwed into the female screw portion 14 to be tightened. For other parts, see the description of the blind nut 13 in FIG.

6 and 7 show a blind nut 23 which is a third embodiment of the present invention. In the blind nut 23, the protrusion 25 is formed on the surface of the flange 17 that contacts the member to be attached (the lower surface in FIG. 6). Ridge 25
As shown in FIG. 7, it is preferable that a plurality of (6 in the illustrated example) are formed on the lower surface of the flange 17 at equal intervals.
The blind nut 23 has the same configuration as the blind nut 21 shown in FIG. 5 except that the protrusion 25 is formed.
Similar to the knurled groove 22, the protrusion 25 is formed by fastening a blind nut to a mounted member such as a panel,
The blind nut 23 is prevented from slipping with respect to the member to be attached when the bolt is screwed into the bolt 4 and tightened. The blind nut 23 does not need to have the knurled groove 22 as long as slip can be prevented. Since the other parts are the same as the configuration of the blind nut 13 in FIG. 4, refer to the description of the blind nut 13.

The operation of fastening the blind nut 13 of FIG. 4 will be described with reference to FIGS. For convenience of illustration, the fastening tool is omitted, and for convenience of description, the fastening work is performed without the attached member.
As shown in the state of (B) of FIG. 8 from the state of (A) of FIG. 8, the blind nut 13 has the tubular portion 15 due to the existence of the slit 18 when the female screw portion 14 is pulled up to the flange 17 side. , Begins to deform so that it easily bends radially outward. The deformation of the tubular portion 15 is first made by the circumferential groove 1
Starts at 9. That is, the circumferential groove 19 defines the position where the tubular portion 15 starts to bend. Further, when the internal thread portion 14 is pulled up to the flange 17 side, the deformation of the tubular portion 15 increases, but the circumferential groove 19 defines the position where the bending starts and the position adjacent to the upper end of the internal thread portion 14. As shown in FIG. 8C, the bending point 26 is located below the position of the bending point 7 of the conventional blind nut 1 of FIG. 2 (the position of the tubular portion 15 at the center). In the tubular portion 15 which is buckled and deformed so as to be folded back at the bending point 26, since the bending point 26 is closer to the female screw portion 14 than the central position of the tubular portion 15, as shown in (D) of FIG. It is formed to be separated from the flange 17. That is, the bending point 26 is separated from the flange 17 and does not contact the flange 17.

FIG. 9 shows how the blind nut 13 is fastened to the mounted member 27. As shown in FIG. 8D, when the tubular portion 15 is buckled and deformed so as to be folded back at the bending point 26, the buckled and deformed tubular portion 15 and the flange 1 are formed.
The mounted member 27 is sandwiched between the blind nut 13 and
Are fastened to the attached member 27. Tubular part 15 after fastening
Engages with the edge of the hole of the attached member 27, but the bending point 26, which is a turning point, moves away from the attached member 27.
Therefore, the buckling portion 9 of the tubular portion of the conventional blind nut 1 shown in FIG. 3 is pressed against the surface of the mounted member 10 and the whitened portion 1 is pressed.
1 to form the blind nut 13 according to the present invention.
Is a buckling deformation portion of the tubular portion 15 including the bending point 26,
It does not come into contact with the surface of the mounted member 27, and thus the mounted member 2
No whitening occurs in 7.

FIG. 10 shows the blind nut 2 of FIG. 5 in which the knurled groove 22 is formed in the blind nut 13 of FIG.
1 is fastened to the mounted member 27, and another mounting member 29
Is attached to the attached member 27. A bolt 30 is used to mount the mounting member 29. The bolt 30 penetrates the mounting hole of the mounting member 29 and is screwed into the female screw portion 22 of the blind nut 21. The knurled groove 22 prevents the blind nut 21 from rotating even when the bolt 30 is rotated for strong tightening.
Does not slip the attached member 27. Further, when the bolt 30 is tightly tightened, the internal thread portion 14 is further pulled upward to further deform the buckled and deformed tubular portion 15, but the bending point 26 is downward (that is, the flange) as shown by an arrow 31. Move away from 17). Therefore, there is no possibility of damaging the attached member 27.

FIG. 11 shows a rivet bolt type fastener 33 which is a fastener according to the fourth embodiment of the present invention.
The fastener 33 penetrates the tubular portion 34, a flange 35 formed at one end of the tubular portion 34, and the inside of the tubular portion 34, and one end (the upper end in the figure) projects from the flange 35 and the other end (the upper side in the figure). The lower end) includes a mandrel 37 fixed to the other end of the tubular portion 34. The end of the mandrel 37 has a tubular portion 3
It is fixed to the end of No. 4 by welding, caulking or the like. A male screw 38 is formed on the mandrel 37 from a position corresponding to the tubular portion 34 to a position where the flange 35 extends. The mandrel portion above the male screw 38 is formed short in the illustrated example. In the illustrated example, the nut member at the tip of the fastening tool is screwed into the male screw 38 and rotated to pull up the mandrel 37, and the tubular portion 3
Buckle 4 A portion of the mandrel above the male screw 38 may be formed long and a small-diameter folded neck portion may be formed, as shown in JP-A-62-242112. In this case, the gripper of the fastening tool is engaged with the mandrel, the gripper is pulled up, and the mandrel is pulled up until it breaks at the small-diameter fold neck.
The tubular portion 34 is buckled and deformed.

A slit 39 extending in the longitudinal direction is formed in the tubular portion 34 to facilitate the buckling deformation of the tubular portion 34. Further, a large number of knurled grooves 41 are formed on the surface of the tubular portion 34 in contact with the member to be attached to prevent slippage with the member to be attached. Further, in the present invention, a peripheral groove 42 that defines the bending start position of the tubular portion 34 is formed on the outer peripheral surface of the tubular portion 34 near the end where the mandrel 37 is fixed. .

With these configurations, in the rivet bolt type fastener 33, the nut portion at the tip of the fastening tool (not shown) is connected to the male screw 38 of the mandrel 37 with the tubular portion 41 inserted in the hole of the member to be attached. Then, the mandrel 37 is pulled up by rotating the nut part of the tool. By this pulling up, the lower end side of the tubular portion 34 is pulled up, and the slit 39 begins to deform so as to easily bend outward in the radial direction. The deformation of the tubular portion 34 begins at the position of the circumferential groove 42, and when the mandrel 37 is further pulled up, the tubular portion 3
4 is buckled and deformed with a position below the center position as a bending point, and the buckling deformed portion and the flange 35 fasten the fastener 33 to the attached member. Also in this fastener 33, since the circumferential groove 42 is formed at a predetermined position, the bending point is separated from the flange 35, and the attached member is not whitened.

From the fastener 33 fastened to the member to be attached, a mandrel 37 having a male screw 38 is projected toward the front side, and after fastening, it can be used as a bolt erected on the member to be attached. That is, another attachment member can be attached to the attachment target member by screwing the nut onto the mandrel 37 that is a bolt. In tightening this nut, since there is a knurled groove 39, the fastener 3
3 does not slip on the mounted member. When the nut is strongly tightened, the mandrel 37 is pulled up to further deform the tubular portion 34, but since the bending point of the tubular portion 34 moves away from the flange 35, there is no possibility of damaging the member to be attached. It should be noted that the flange 35 may be provided with a ridge for preventing slippage as shown in FIGS. 6 and 7 on the surface in contact with the member to be attached. The blind nut 44 of FIG. 12 includes a female threaded portion 45 and a tubular portion 4 following the female threaded portion 45.
6 and a flange 48 formed at the end of the tubular portion. A slit 49 extending in the longitudinal direction is formed in the tubular portion 46. Further, the tubular portion 46 has a knurl groove 50.
Many are formed to prevent slippage with the attached member. Plural ridges 52 for preventing slippage are formed on the surface of the flange 48 in contact with the member to be attached at intervals. This blind nut 44
With the tubular portion 46 inserted in the hole of the member to be attached, the tubular portion 4 is inserted.
6 can be buckled and deformed, and can be fastened to the attached member by the buckling deformed portion and the flange 48. Slip after fastening can be prevented.

[0023]

According to the blind nut of the present invention, since the peripheral groove is formed on the outer peripheral surface of the tubular portion in the vicinity of the internal thread portion, the tubular portion begins to bend from the peripheral groove portion, whereby the bending point. Shifts from the intermediate position of the tubular portion to the female screw portion side. The buckling portion of the tubular portion that is folded back at the bending point is not pressed against the surface of the mounted member, and whitening of the thermoplastic is prevented. Further, even if the bolt is strongly screwed into the blind nut, the buckling portion is not deformed and crimped away from the surface of the mounted member, so that the mounted member can be prevented from being damaged.

According to the rivet bolt type fastener of the present invention, a slit extending in the longitudinal direction is formed in the tubular portion,
Since a peripheral groove is formed on the outer peripheral surface of the tubular portion near the end where the mandrel is fixed, buckling deformation of the tubular portion due to rotation of the nut means screwed onto the mandrel is caused by the peripheral groove of the tubular portion. Starting from the part of Fig. 1, the bending point shifts from the central position toward the end where the mandrel is fixed. Due to this misalignment, the buckling part of the tubular part will not be pressed against the surface of the mounted member, whitening of the thermoplastic will not occur, and even if the nut is strongly screwed to the mandrel, Since the bent portion deforms away from the surface of the mounted member, damage to the mounted member can be prevented.

According to the present invention, in the above fastener, a groove or a protrusion means for preventing slippage can be formed on the surface of the tubular portion which comes into contact with the attached member or the surface of the flange which comes into contact with the attached member. Therefore, the fastener can prevent the member to be attached from slipping by tightening the bolt and the nut.

[Brief description of drawings]

FIG. 1 is a front view, in half section, of a conventional blind nut.

FIG. 2 is a front view showing a state in which the blind nut of FIG. 1 is buckled and deformed.

FIG. 3 is a view showing a state in which the blind nut of FIG. 1 is fastened to a member to be attached.

FIG. 4 is a front view, in half section, of the blind nut according to the first embodiment of the present invention.

FIG. 5 is a half sectional front view of a blind nut according to a second embodiment of the present invention.

FIG. 6 is a front view, in half section, of a blind nut according to a third embodiment of the present invention.

FIG. 7 is a bottom view of the blind nut of FIG.

FIG. 8 shows a state of buckling deformation of the tubular portion of the blind nut of FIG. 4, (A) is a front view of the blind nut before buckling, and (B) is a front view of the blind nut where buckling has started. The figure, (C) is a front view of the blind nut in the middle of buckling, and (D) is a front view of the blind nut at the end of buckling.

FIG. 9 is a diagram showing a state in which the blind nut of FIG. 4 is fastened to a member to be attached.

10 is a diagram showing a state in which another mounting member is mounted on the mounted member using the blind nut of FIG. 5 fastened to the mounted member.

FIG. 11 is a front view, in half section, of a rivet bolt type fastener according to a fourth embodiment of the present invention.

FIG. 12 is a half sectional front view of another blind nut.

[Description of Reference Signs] 1 Conventional blind nut 2 Female threaded portion 3 Tubular portion 5 Flange 6 Slit 11 Whitened portion 13 Blind nut 14 of the first embodiment of the present invention 14 Female threaded portion 15 Tubular portion 17 Flange 18 Slit 19 Circumferential groove 21 Present invention Blind nut 22 knurled groove 25 ridge 26 bending point 27 attached member 29 another attachment member 30 bolt 33 rivet bolt type fastener 34 tubular portion 35 flange 37 mandrel 38 male screw 39 slit 41 knurled groove 42 circumference groove

Claims (7)

[Claims] 1. A female screw portion, a tubular portion following the female screw portion, and a flange formed at an end portion of the tubular portion. The tubular portion is seated in a state in which the tubular portion is inserted into a hole of a member to be attached. A blind nut, which is configured to be bent and deformed to be fastened to a member to be attached by the buckling deformed portion and the flange, and in which a slit extending in the longitudinal direction is formed in the tubular portion, A blind nut characterized in that a peripheral groove is formed on the outer peripheral surface near the female screw portion. 2. The blind nut according to claim 1, wherein a knurled groove is formed on a surface of the tubular portion that contacts the mounted member. 3. The blind nut according to claim 1 or 2, wherein a projection means is formed on a surface of the flange that contacts the mounted member. 4. A tubular portion, a flange formed at one end of the tubular portion, and an inside of the tubular portion, one end protruding from the flange and the other end fixed to the other end of the tubular portion. A mandrel, and is configured to buckle and deform the tubular portion in a state where the tubular portion is inserted into the hole of the mounted member, and to fasten the buckled deformed portion and the flange to the mounted member. In the fastener in which the mandrel is formed with an external thread, the tubular portion is formed with a slit extending in the longitudinal direction, and the outer peripheral surface of the tubular portion near the end where the mandrel is fixed, A fastener characterized in that a circumferential groove is formed. 5. The fastener according to claim 4, wherein a knurled groove is formed on a surface of the tubular portion that contacts the mounted member. 6. The fastener according to claim 4 or 5, wherein a protrusion means is formed on a surface of the flange that contacts the mounted member. 7. A female thread portion, a tubular portion following the female thread portion, and a flange formed at an end portion of the tubular portion. The tubular portion is seated in a state where the tubular portion is inserted into a hole of a member to be attached. A blind nut, which is configured to be flexibly deformed and fastened to a mounted member by the buckling deformed portion and the flange, and in which a slit extending in the longitudinal direction is formed in the tubular portion, the tubular portion or the A blind nut characterized in that a projection means is formed on a surface of the flange which is in contact with the mounted member.