JPH1047329A - Fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the time and labor required for fixing a nut and tapping by forming the thread ridge of a bolt into saw tooth thread and forming the thread hole of the nut of a plurality of engaging pieces with the tips engaged with the head side thread ridge face of the bolt. SOLUTION: The thread ridge of a bolt is formed in saw tooth thread shape, and the tips of engaging pieces 3A of a nut 2 are so formed that the nut 2 is easily engaged with the head side thread ridge face of the bolt 1 at the time of fastening the bolt 1. At the time of fastening the other member 5 of U-shape with a through hole 5A of a bolt 1 formed, to one member 4 with a fit-in square hole 4A formed, the nut 2 is fitted into the square hole 4A of one member 4, and the other member 5 is put over one member 4. The bolt 1 is then pushed into the nut 2 and fastened. In this case, the bolt 1 can easily be pressed into the nut 2 by pressing the nut 2 with fingers or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening device, and more particularly to a fastening device capable of easily and reliably fastening two members.

[0002]

2. Description of the Related Art Bolts and nuts are generally used as a means for fastening two members. However, in order to prevent the nuts from rotating together when tightening the bolts, it is necessary to hold the nuts one by one with a tool. there were. In order to eliminate this complexity, the nut has been fixed to the member surface in advance by welding, caulking, or the like, or the member has been tapped in place of the nut. Hereinafter, this fastening means is referred to as a conventional technique.

[0003]

However, according to the above-mentioned prior art, although the workability is improved, there is a problem that it takes time and labor to fix the nut and to tap.

Accordingly, the object of the present invention is to provide a fastening effect equivalent to that of a normal bolt and nut connection.
When tightening the bolts, it is not necessary to hold down the nuts one by one with a tool, and it is necessary to fix the nuts to the member surface in advance by welding or caulking, or to tap the members instead of the nuts. The object of the present invention is to provide a fastening device without the above.

[0005]

According to the first aspect of the present invention,
In a fastening device comprising a bolt and a nut for fastening two members to each other, a screw thread of the bolt is formed in a saw-tooth shape, and a tip of a screw hole of the nut into which the bolt is screwed has the tip. It is characterized in that it is composed of a plurality of engagement pieces that engage with the thread surface on the head side of the bolt.

The invention according to claim 2 is characterized in that the plurality of engagement pieces of the nut are formed radially by punching a part of one of the members.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the fastening device according to the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a fixing structure by the fastening device of the present invention, and FIG.
Is a plan view showing a nut in the fastening device of the present invention,
3 is a front view showing a nut in the fastening device of the present invention, FIG. 4 is a sectional view taken along line AA of FIG. 2, FIG. 5 is a front view showing a bolt in the fastening device of the present invention, and FIG. FIG. 7 is a perspective view showing a fence assembled by the fastening device of the present invention, FIG. 7 is a partial plan view showing the fence before assembly by the fastening device of the present invention, and FIG. 8 is a fence after assembly by the fastening device of the present invention. FIG.

1 to 8, reference numeral 1 denotes a bolt of the fastening device according to the present invention. As shown in FIG. 5, the screw thread of the bolt 1 is formed in a saw-toothed screw shape in which the cross-sectional shape of the screw thread is formed in a shape close to a right triangle.
When the is tightened, the tip of an engagement piece of a nut described later is easily engaged with the thread surface (A) on the head side of the bolt 1.

Reference numeral 2 denotes a nut of the fastening device of the present invention. As shown in FIGS. 2 to 4, the nut 2 is formed by forming a screw hole 3 at the center of a square hat-shaped fitting. The screw hole 3 is formed by punching a part of the metal fitting to form a plurality of engagement pieces 3A radially, and each of the engagement pieces 3A has a tip formed on a thread surface (A) on the head side of the bolt 1. It is formed by bending the inside of the metal fitting so as to be engaged.

When the bolt 1 is pushed into the screw hole 3 of the nut 2 constructed as described above and the bolt 1 is tightened, the engaging piece 3A is engaged with the thread surface (A) of the bolt 1, and
Since the same operation as that of a normal nut is obtained, the members can be fastened.

With the above-described fastening device of the present invention,
As shown in FIG. 1, in order to fasten another U-shaped member 5 in which a bolt 1 insertion hole 5A is formed to one member 4 in which a square hole 4A into which the nut 2 is fitted is formed. The nut 2 is fitted into the square hole 4A of one member 4, the other member 5 is overlapped with the one member 4, and the bolt 1 is
And tighten it.

In this case, if the nut 2 is pressed with a finger or the like,
The bolt 1 can be easily pushed into the nut 2.
When the nut 2 is placed on another stand or the like, even if the bolt 1 is pushed into the screw hole 3, the nut 2 does not come out of the one member 4. Therefore, when the bolt 1 is tightened in these states, the members 4 and 5 are fastened to each other. This fastening structure is, for example, the two members 4, 5
It is applied to a case where a wire mesh is fixed to a support by sandwiching a wire mesh for a fence therebetween.

The engaging piece 3A of the nut 2 may be formed directly on the member to be fastened. For example, as shown in FIG. 6, when assembling a fence by fixing a wire mesh 8 to a support column 6 through a joint pipe 7, as shown in FIG. An engagement piece 3A similar to the engagement piece is formed radially by punching a part of the joint pipe 7. Thus, the engagement piece 3 is attached to the joint pipe 7.
If A is formed, it is inserted into the joint pipe 7 into the end of the wire mesh 8 (the body edge bent into a ring shape), and the holding metal fitting 9 applied to the end is a bolt similar to the above-described bolt. 1
When the wire mesh 8 is tightened, the wire mesh 8 is fixed to the column 6, and the fence is assembled.

According to this fastening structure, there is no need to fix the nut to the inner surface of the joint pipe 7 by welding or the like, but simply push the bolt 1 into the nut 2 and tighten it.
The body edge of the wire mesh 8 can be fixed to the column 6. Therefore, the assembly time of the fence is greatly reduced.

[0015]

As described above, according to the present invention, the screw thread of the bolt is formed by the saw tooth screw, and the screw hole of the nut is engaged with the screw thread surface on the head side of the bolt. By forming with a plurality of engaging pieces to be used, it is possible to have a fastening effect equivalent to ordinary bolts and nuts, as well as nuts when tightening bolts.
There is no need to hold down with a tool, and useful effects such as no need to fix the nut to the member surface in advance by welding or caulking, or to tap the member instead of the nut. .

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a fixing structure by a fastening device of the present invention.

FIG. 2 is a plan view showing a nut in the fastening device of the present invention.

FIG. 3 is a front view showing a nut in the fastening device of the present invention.

FIG. 4 is a sectional view taken along line AA of FIG. 2;

FIG. 5 is a front view showing a bolt in the fastening device of the present invention.

FIG. 6 is a perspective view showing a fence assembled by the fastening device of the present invention.

FIG. 7 is a partial plan view showing a fence before assembly by the fastening device of the present invention.

FIG. 8 is a partial plan view showing the fence after assembly by the fastening device of the present invention.

[Explanation of symbols]

 1: Bolt 2: Nut 3: Screw hole 3A: Engagement piece 4: One member 4A: Square hole 5: The other member 5A: Bolt insertion hole 6: Strut 7: Joint pipe 8: Wire mesh 9: Holding metal

Claims (2)

[Claims] 1. A fastening device comprising a bolt and a nut for fastening two members to each other, wherein a screw thread of the bolt is formed in a saw-tooth shape and a screw hole of the nut into which the bolt is screwed. Is a fastening device comprising a plurality of engagement pieces each of which has a tip engaged with a thread surface on the head side of the bolt. 2. The fastening device according to claim 1, wherein the plurality of engagement pieces of the nut are formed radially by punching a part of one of the members.