JPH078894Y2 - nut - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nut, such as a weld nut, which is fixedly attached to a base body, and more particularly to a nut for preventing paint or the like from adhering to its threaded portion.

[0002]

2. Description of the Related Art Conventionally, a large number of weld nuts have been used for fastening a seat or the like in an underbody portion of an automobile. In the automobile assembly process, first, a weld nut is welded to a predetermined position of the underbody portion, and then exterior coating is usually performed by immersing it in a dowel. After that, as shown in FIG. 4, a vinyl chloride-based paint having a high adhesiveness is spray-applied from the outside of the vehicle body to the underbody portion for rust prevention, soundproofing, vibration proofing, and the like. However, if this vinyl chloride paint adheres to the thread part of the weld nut, the screw fastening function will be impaired.Before spray coating, weld the weld nut screw holes welded to the underbody part one by one. The tape and the resin stopper were closed, and after the spray coating was completed, the adhesive tape and the resin stopper were peeled off.

[0003]

Therefore, in the conventional nut, in order to prevent the paint from adhering to the thread portion,
There is a problem that the work of closing the screw holes with an adhesive tape or the like and the work of peeling off the screw holes after painting are required, resulting in poor workability and requiring a great number of man-hours. This is a serious problem particularly in an automobile assembly line or the like where the time in seconds greatly affects the cost.

In order to solve this problem, JP-A-60-
The device described in Japanese Patent No. 175816 has been proposed. The invention described in this publication is one in which a peripheral edge portion of a seal member having a breaking line formed on a seat surface opposite to a welding surface of a weld nut is fixed to be integrated. The reason for providing the break line is to allow the seal member to be successfully broken into small pieces without falling off when bolting. Therefore, the break lines are provided radially from the center of the seal member, and a large number of substantially fan-shaped claws are attached to the seat surface of the weld nut.

For this reason, when the rigidity of the seal member is small, when the paint is strongly sprayed, these claws bend inward to form a large opening in the center, and the paint may enter the screw hole. is there. Moreover, before that, there is a possibility that the nail may be bent outward in the dobu pickling step.

Therefore, when the invention described in this publication is put to practical use, it is necessary to employ a seal member having a considerable rigidity so as not to be bent or bent in the paint spraying process or the doppling process. However, there is a problem in that the thickness must be increased or a material having high rigidity must be adopted as a constituent material.

On the other hand, in the nut described in this publication , if the rigidity of the seal member is increased , the breaking line opens when the nut is dipped.
In addition, since the sealing member exhibits sealing performance even with respect to the dobu-zuke paint, it becomes difficult to discharge the dobu-zuke paint. Therefore,
After soaking in the dough, wipe the inside of the screw holes with a waste cloth or
It is necessary to work to remove the paint in the screw hole by rotating it
Become. If you don't do these, you will find that the dobu-zuke paint has a low viscosity.
However, a large amount of them will stick to the bolts, which will cause problems when tightening the bolts.
There is In other words, it is simply used as a rust preventive and has a high viscosity.
Prevents paint from adhering to the screw holes against spray spray
Alone, it will hinder other parts of the automobile manufacturing process.
There was a problem that they would come.

Further, in the nut described in this publication, a thin film is used.
When fixing, the ends are just sandwiched from above and below
Therefore, when the breaking line is pushed open by bolting, the thin film
The force that pulls the whole acts, and it falls into the car and becomes dust.
Cause it remains and then rolls while driving, causing an unpleasant sound
In some cases

The present invention has been made in order to solve the above problems, and has the following configuration.

[0010]

That is, the gist of the present invention is that a nut used by fixing a seat surface to a base body is used.
At the top of the screw hole on the side opposite to the seat surface,
A thin film that covers the
Multiple small holes or thin cutouts that are independently opened
If the screw hole is filled with liquid,
To form a liquid draining means, and to attach the thin film
Is a ridge or strip formed in the film thickness direction along the peripheral edge of the thin film.
Holds the protrusion on the caulking part formed above the screw hole
The nut is characterized by being made by
It

[0011]

[Action] In the present invention the nut consisting of the above-described configuration, since the plurality of small holes or a plurality of narrow end cutouts are opened independently at a position not in contact with each other, different from those disclosed in the publication, The thin film as a whole forms a single film (substantially at the paint contact portion).

Therefore, according to the nut of the present invention, a plurality of small holes or a plurality of notches are liquified during the soaking process.
It acts as a body removing means, and the coating liquid flows out smoothly from these so that the coating material does not remain in the screw holes and adheres in large amounts . Moreover, since the thin film forms one film as a whole, the thin film itself No great rigidity is required.

On the other hand, as shown in FIG. 4, the vinyl chloride-based paint spray-applied from the outside has a high degree of adhesion and large particles, and even if there are a plurality of small holes or a plurality of thin notches , they penetrate into the screw holes. It is prevented, and even if it breaks in, it stays only slightly. Therefore, the fastening function of the screw is not impaired. At this time as well, since the thin film forms one film as a whole, the film as a whole can withstand the paint spraying pressure even if the rigidity of the thin film is not so great.

As described above, according to the present invention, a plurality of small holes or a plurality of small holes independently formed at positions where they do not contact each other.
Since the structure in which the notch is provided is adopted, it is possible to easily discharge the dipped pickled paint while effectively preventing the sprayed paint from entering. Moreover, since the thin film itself is configured as one film as a whole, it can withstand a large pressure without increasing the rigidity of the thin film, and therefore is attached so as to cover the upper part of the nut screw hole. The thin film can be made thin, and the range of materials that can be used as the thin film can be greatly expanded.

The fact that the thickness can be made thin means that when the bolts are tightened, they are easily broken or stretched by being pressed by the tip of the bolts.
It also has the effect that it can be executed smoothly . Moreover, for example, as shown in FIG. 2, there is a structure in which a thin film is provided on the upper part of the screw hole by caulking to prevent the film from falling off.
Since it is adopted, the thin film pieces that are torn due to the bolt tightening work remain on the nut, so that it does not remain as dust in the finished car or pollute the factory. This conclusion
As a result, the thin-film debris rolls inside the finished vehicle and produces an unpleasant sound.
There is no way to do it.

Further, to form a projection or projections on the thin film peripheral portion, which can be adopted a configuration to hold the caulking portion of the screw hole upper is not limited to the time of bolt fastening, the groove pickled paint and spraying paint even a large force is applied to the attachment portion of the film by the pressure, it is <br/> phrase from falling off the thin film attachment portion, in this regard, only simply crimping as the invention of the publication has a large This is very different from the fact that the thin film falls off from the upper part of the screw hole when pressure is applied . From this point of view, when the device described in the above publication is put to practical use, it is necessary to make the thin film highly rigid so that a large force (a force in the direction of dropping the thin film) is not applied to the caulking portion. It will happen.

Therefore, according to the nut of the present invention, it is possible to further reduce the rigidity of the thin film, and it is possible to further expand the selection range of the material and film thickness that can be adopted as the thin film. . In this way, the present invention
The nut is a means to prevent high viscosity paint from entering the screw hole.
A thin film that acts as a
It is not a thin film but has a low viscosity, but it has screw holes like dobu-zuke
Acts as a liquid draining means for draining paint filled in
Multiple small holes or multiple thin notches that do not touch each other.
So that the nuts are originally
Even if the thin film is pulled by the bolt fastening that is the function of
A protrusion to hold the caulked part so that it does not fall off.
Characterized by the fact that a thin film with stripes or protrusions is used
-ing

That is, the nut of the present invention prevents the intrusion of paint.
Means, liquid draining means, and fall prevention means are both provided.
By installing the thin film, for example, in the automobile assembly process
"Dubuzuke", "Spray spray", "Bolt tightening"
Each work of “conclusion” is smooth and involves new work.
It can be performed without any problem, and it can exert a very remarkable effect that the thin film, which is an important configuration for that, does not become a source of generating an unpleasant sound during the driving of the completed vehicle.

[0019]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 3 show a weld nut according to a first embodiment of the present invention. The weld nut 1 is composed of a cylindrical main body 3 in which a female screw 2 is engraved, and a thin film 10 caulked and attached to a caulking portion 5 above a screw hole 4 of the female screw 2. Further, a collar-shaped mounting seat 6 is provided on the lower portion of the main body 3, and a welding projection 8 is provided at four places on the seat surface 7 thereof.

As shown in FIGS. 3 (a) and 3 (b), the thin film 10 is composed of a thin disk 11 made of synthetic resin, and a ridge 12 for preventing it from falling is formed on the periphery thereof. In addition, ridge 1
8 notches 13 radially from 2 to the center of the thin film 10
Is provided. The notch 13 serves as an outflow hole for the paint when dipped in the coating, and acts so that the thin film 10 is finely broken when the bolt is fastened.

Next, the operation and effect of the weld nut 1 in the automobile assembling process will be described with reference to FIGS. 4 and 5. The weld nut 1 is fixed by welding from the outside to the predetermined position with the underbody portion of the automobile as the base body 20 through the welding projection 8 of the seat surface 7. After that, the exterior coating is performed together with the base body 20 by pickling. The paint that has entered the screw hole 4 flows out through the notch 13 in the drying process.
In this way, the paint in the dobu-zuke coating does not remain in the screw holes 4, and the paint that adheres to the female screw 2 in the process of the dobu-zuke coating has a low degree of adhesion and a thin coating film, and therefore has a function of fastening the weld nut 1. Has no effect. Next, as shown in FIG. 4, a vinyl chloride-based paint that forms a thick coating film with a high degree of adhesion is sprayed from the outside with a spray gun 30 or the like to prevent rust, noise, and vibration of the underbody part. Painted. Since the vinyl chloride paint has a high degree of adhesion as described above,
Since it is sprayed as relatively large particles, the thin film 10
It is difficult to penetrate into the screw hole 4 through the notch 13 of FIG. Further, since it adheres to the notch 13 to form a coating film before entering the screw hole 4, only a very small amount adheres to the female screw 2. In this way, the action of the thin film 10 can prevent adhesion of the vinyl chloride-based paint to the female screw 2, and the weld nut 1
It is possible to prevent the fastening function of the.

Next, as shown in FIG. 5, the bolt 40 is fastened to the weld nut 1. At this time, the thin film 10 is torn along the notch 13 by the tip portion 41 of the bolt 40 to form eight strips 11a. At this time, each strip 11a is held on the crimped portion 5 by the ridge 12 , and
Remaining in the weld nut 1 without having to drop out of this.

As described above, according to this embodiment, after the weld nut 1 is fixed, the female screw can be applied without any special work in the series of steps of soaking, spray painting, and bolt fastening. It is possible to prevent the vinyl chloride-based paint from adhering to 2, and the bolt 30 can be fastened without any trouble. As a result, workability can be significantly improved. Further, in the process, it is possible to prevent the paint at the time of dobu-zuke coating from remaining in the screw holes 4, and to prevent the thin film 10 torn off from remaining in the completed vehicle as dust or polluting the factory. br />-out that.

[0024] Next will be described another embodiment with reference to FIG. 6 (A) to 8. FIG. 6A shows the second embodiment, and the weld nut 51 has the same structure as that of the first embodiment.
The main body 53 has a hexagonal column shape. FIG. 6B shows the third embodiment, in which the weld nut 61 has a main body 63 in the shape of a rectangular parallelepiped, and welding projections 68 are provided at the corners of the lower end thereof. The other points are the same as in the first embodiment.

FIG. 7 shows a fourth embodiment and shows a plate nut 71 to which the present invention is applied. The plate nut 71 has the same structure as the weld nut 1 of the first embodiment,
The lower part of the main body 73 is provided with a plate 76 and a mounting hole 78,
It is fixed to the base body by screwing or the like through the mounting hole 78. Its advantages are Ru similar Der as welt nut 1.

[0026] on or more, has been explained some embodiments of the present invention, the present invention is not intended to be limited thereto, it is possible to employ various aspects within a scope not departing from the gist thereof. For example, a metal material such as aluminum foil, paper, or various other materials may be used as the thin film . Also,
A thin film made of synthetic rubber or the like may be provided so that when the bolt is fastened, it may be deformed so as to wrap the tip of the bolt. In this case, the bolt is covered and the bolt is directly exposed to the external environment and rust etc. occurs. It also has the effect of preventing this.

For example, as the thin film, a metal material such as aluminum foil, paper, and various other materials may be used . Et al. Is,
A cage-like thing may be provided as a thin film. Also,
A thin film made of synthetic rubber or the like may be provided so that when the bolt is fastened, it may be deformed so as to wrap the tip of the bolt. In this case, the bolt is covered and the bolt is directly exposed to the external environment and rust etc. occurs. It also has the effect of preventing this.

[0028]

As described above, according to the present invention, it is possible to prevent the paint or the like from entering the screw holes of the nut fixedly used on the base body, and the screw fastening function is not impaired. As a result, it is not necessary to attach an adhesive tape or the like to the screw hole in order to prevent the paint from entering, and to remove the adhesive tape, so that the workability can be greatly improved.

Further, in the present invention, since the thin film is formed as one film as a whole by adopting a structure in which a plurality of small holes or notches independently opened at positions where they do not contact each other is adopted, the thickness of the thin film is The thickness can be made thin and the range of adoption of the constituent material can be expanded.

Moreover, the thin film is placed on the upper part of the nut through the ridges and the like.
Since it is fixed by crimping on it, when the paint is soaked in the paint, the paint is sprayed.
Nuts even when pulling force is applied when tightening bolts, etc.
Without top or we thin film is falling, there is an effect that does not or caused to generate an unpleasant sound rolling around in the finished car.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment.

FIG. 2 is a sectional view of the first embodiment.

FIG. 3A is a partial plan view of a plane of the thin film of the first embodiment taken along the center line of thickness, and FIG. 3B is a sectional view taken along line AA.

FIG. 4 is an explanatory view showing a state of spray coating when the weld nut of the first embodiment is used in an automobile underbody part.

FIG. 5 is a partial cross-sectional view showing a state in which the weld nut of the first embodiment is used for an underbody portion of an automobile and spray coating is performed, and then a bolt is fastened.

6A is a perspective view of the second embodiment, and FIG. 6B is a third view.
It is a perspective view of an Example.

FIG. 7 is a perspective view of a fourth embodiment.

[Explanation of symbols] 1 ... Weld nut 2 ... Female screw 4 ...
Screw hole 7 ... Seating surface 10 ... Thin film 20 ... Base 51, 6
1 ... Weld nut 71 ... Plate nut

Claims (1)

[Scope of utility model registration request] 1. A nut used by fixing a seat surface to a base body , wherein the screw is provided at an upper portion of a screw hole on the side opposite to the seat surface.
A thin film covering the hole attached to the thin film, in Rukoto a plurality <br/> small holes or narrow notches which open independently at a position not in contact with each other, when the liquid is filled in the threaded hole This
Le to form a liquid draining means for removing the further of the thin film instrumentation
Adhesion is a ridge formed in the film thickness direction along the peripheral edge of the thin film.
Alternatively, keep the protrusion in the crimped part formed on the screw hole.
Nut, characterized in that has been made by causing lifting.