KR100883305B1 - Screwing type coupling structure - Google Patents

Abstract

A screw thread combining structure is provided to improve structures of a male screw combining part and a female screw combining part so as to combine the male and female screw combining parts according to one rotation. A screw thread combining structure includes a male screw combining part(10a) and a female screw combining part(20a). The male screw combining part has a screw face(12a) at which a thread is formed, which is located on the outer face of the male screw combining part, and a non-screw face(14a) at which the thread is not formed. The female screw combining part has a screw face(22a) at which a thread is formed, which corresponds to the non-screw face of the male screw combining part, and a non-screw face(24a) at which the thread is not formed.

Description

Threaded fastening structure {SCREWING TYPE COUPLING STRUCTURE}

The present invention relates to a fastening structure of a screw thread, and relates to a fastening structure of a screw thread to enable fast fastening by improving the structures of the male threaded fastening portion and the female threaded fastening portion used for screwing.

The male threaded fastening part and the female threaded fastening part used in the conventional screw coupling are screw thread formed on the entire surface, and the male threaded fastening part and the female threaded fastening part must be relatively rotated from the beginning.

Therefore, the screw thread has to be rotated by the number of lines, so the fastening speed is slow and cumbersome.

Also, if the male threaded fastening portion and the female threaded fastening portion are not properly aligned at first, the thread is damaged and the intended fastening cannot be made. Therefore, attention was required to align the male threaded fastening portion and the female threaded fastening portion.

The present invention has been made in order to solve the problems of the prior art as a new screw thread to the male threaded fastening portion and the female threaded fastening portion in a straight line and then complete the fastening of the male threaded fastening portion and the female threaded fastening portion by one rotation. To provide a fastening structure of.

The object of the present invention is provided with a male threaded fastening portion side threaded surface formed with a thread along the male threaded fastening portion side spiral trajectory on the portion corresponding to the predetermined circumferential angle of the outer circumferential surface and the male threaded fastening side threaded surface A portion of the male thread forming portion and the inner circumferential surface corresponding to the male thread forming portion and the non-threaded surface of the male thread forming portion and the thread forming surface on which the thread is not formed is provided on the female thread forming portion side spiral trace. According to the present invention, the female threaded fastening part side threaded face having a thread formed thereon is provided, and the female threaded fastened part side threaded face includes a female threaded fastened part provided with the female threaded fastened part side threaded threaded face where the thread is not formed. The male threaded fastening portion is the female thread in the outer peripheral surface A male thread-forming fastening side transverse threading part in which a total number of threads is formed along the male thread-forming fastening side-side spiral trajectory on the outer end circumferential surface of the other end located on the opposite side of the one end entering the forming fastening part is further formed, and the female screw-forming fastening is formed. The female thread forming fastening side screw is formed on the inner threaded end of the inner end of the inner circumferential surface of the inner circumferential end of the end of the inner circumferential surface of the inner circumferential surface formed by a total number of threads along the trajectory on the female thread forming fastening side. The male threaded fastening portion enters into the female threaded fastening portion and is fastened in a state where the male threaded fastening portion side threaded surface and the female threaded fastening side threaded surface are positioned side by side.

The object of the present invention is the male threaded fastening portion side thread formation in which the male threaded fastening side side thread is formed along the male threaded fastening side side spiral trajectory in a part of the circumferential direction of the outer circumferential surface located at the front portion entering the female threaded fastening portion among the entire length A portion is provided, except for the male threaded fastening portion side threaded surface is provided with a male threaded fastening portion side thread unformed surface is not formed, the male threaded fastening portion side portion is not formed, located in the rear of the front portion of the entire length On the outer circumferential surface there is a male threaded fastening portion provided with a male threaded fastening portion side forward threaded portion in which a total thread is formed by a predetermined number of rows along the male threaded fastening portion side spiral trajectory, and a rear portion that is the side into which the male threaded fastening portion enters from the entire length. Number of medial circumferential surfaces The portion corresponding to the threaded fastening side threaded surface is provided with a female threaded fastened side threaded surface formed with a female thread-shaped fastened side threaded portion along a spiral path of the female threaded fastened side threaded portion, except for the female threaded fastened side threaded surface. The female thread-forming fastening side-side thread unformed surface of the female thread-forming fastening side side thread is not provided, and an inner circumferential surface located in front of the rear portion of the entire length is provided along a predetermined trajectory along the female thread-forming fastening side spiral. A female threaded fastening part having a female threaded fastening part side transverse threaded part formed by a total number of threads, and wherein the male screwed fastening part is located in parallel with the male threaded fastening part side threaded surface and the female threaded fastened side threaded side; The additional fastening is entered into the female screw forming part It is achieved by the connecting structure of the thread.

In addition, the shape through which the male thread forming portion side thread forming surface is projected on one plane may be rectangular, trapezoidal or triangular.

In order to achieve the additional object, the shape projecting the male thread-forming fastening side thread-forming surface on one plane is rectangular and has the same circumferential shape in front of the female thread-forming fastening-side forward screw part of the inner circumferential surface of the female thread-forming fastening part. The female thread-forming fastening side thread-forming surface and the female thread-forming fastening side thread-less surface are further formed at the position, and the male thread-forming fastening side thread-unscrewing surface is formed in the state where the male thread-forming fastening portion and the female thread-forming fastening portion are fastened. A stopper in a space between the male threaded fastening side threaded threaded surface and the female threaded fastened threaded side threaded surface in a state where the female threaded threaded fastened side threaded threaded surface in front of the female threaded threaded fastened side threaded portion is positioned to face each other. Can be inserted.

In addition, the object of the present invention is provided with a male threaded fastening portion side threaded surface formed with a screw thread along the threaded fastening portion side spiral trajectory on the portion corresponding to the predetermined circumferential angle of the outer circumferential surface and the male threaded fastening side threaded surface Except for the male threaded fastening portion side threaded non-threaded thread forming portion and the inner circumferential surface on the portion corresponding to the male threaded fastening side threaded threaded surface, the female thread forming fastening side side spiral trajectory According to the present invention, the female threaded fastening portion side threaded surface is provided with a thread formed thereon, and the female threaded fastened side side includes a female threaded fastener portion provided with the female threaded fastened side threaded surface where the thread is not formed. A lower edge of the male threaded engagement-side threaded surface; The female screw forming fastening portion side thread forming surface is formed at the lower edge of the engaging projection further, the male screw forming fastening side screw forming surface and the female thread forming fastening side screw non-formed side in the state in which the male screw fastening portion is the female screw It is also achieved by the fastening structure of the screw thread to enter and tighten the forming fastening portion.

In addition, at the bottom edge of the male thread forming portion side threaded surface or the bottom edge of the female thread forming portion side threaded surface may be further formed a locking projection insertion groove for the engaging projection.

In addition, the above object of the present invention is provided with a male thread forming fastening side side threaded surface formed with a thread along the spiral path of the male threaded fastening side side of the outer circumferential surface corresponding to predetermined circumferential angles and forming the male threaded fastening side thread. A portion of the male threaded fastening portion that is not formed with the thread on the side of the male threaded fastening portion that has no thread formed on the side thereof, and a portion of the inner circumferential surface corresponding to the male threaded fastening side of the threaded surface on the female threaded fastener side side. A female threaded fastening portion side threaded surface with a thread formed along the trajectory is provided and a portion except the female threaded fastened side threaded surface includes a female threaded fastened portion provided with a female threaded fastened portion side threaded unformed surface where the thread is not formed. The male threaded engagement side threaded surface and the female threaded type The male screw forming fastening portion enters and fastens the female screw forming fastening part in a state in which the fastening part side thread unshaping surface is positioned side by side, and the male screw forming fastening part and the female screw forming fastening part have the male thread forming fastening side screw forming surface and the It is also achieved by the fastening structure of the screw thread, characterized in that the leader lines indicative of the female thread forming fastening portion side thread unforming surface are further formed.

In addition, the object of the present invention is used in the fastening structure of the screw thread, the first support piece formed of a curved surface having a width corresponding to the arc length of the male thread forming fastening portion side thread unformed surface of the male thread forming fastening portion, and the female screw A second support piece and a first support piece and one end of each of the first support piece and the second support piece, each of which is formed in a curved surface having a width corresponding to the arc length of the female thread-forming fastening portion-side thread-forming surface of the forming fastening portion, And a bent support wire, wherein the first support piece and the second support piece are connected to each other at opposite ends of the one end of each of the support wires formed such that one end thereof is spaced apart from each other. It is also achieved by a stopper used in the structure.

Further, the curved surface of the first support piece is formed with the same curvature as the curvature of the male thread-joint portion side thread-forming surface, and the curved surface of the second support piece has the same curvature as the curvature of the female thread-forming fastening side-side thread-forming surface. It is preferably formed.

According to the screw fastening structure according to the present invention, the male threaded fastening portion and the female threaded fastening portion enter a straight line, and there is an effect of completing the fastening of the male threaded fastening portion and the female threaded fastening portion by one rotation.

Hereinafter, with reference to the accompanying drawings will be described the configuration of a screw fastening structure according to a preferred embodiment of the present invention. The same reference numerals are used for components having the same function.

1 is a perspective view showing a male screw forming fastening portion and a female screw forming fastening portion of a screw fastening structure according to a first embodiment of the present invention, and FIG. 2 is a male screw formation of a screw fastening structure according to a first embodiment of the present invention. 3 is a side cross-sectional view showing the fastening portion and the female screw forming fastening portion, and FIG. 3 is a plan sectional view showing the male screw fastening portion and the female screw forming fastening portion of the screw fastening structure according to the first embodiment of the present invention. As shown in Figures 1 to 3, the fastening structure of the screw thread according to the first embodiment of the present invention includes a male screw forming portion 10a and a female screw forming portion 20a.

The male threaded fastening portion 10a is a male threaded fastening portion side threaded surface 12a having a thread formed along the spiral path of the male threaded fastening side side on the outer circumferential surface and a male threaded fastened side threaded surface at which no thread is formed 14a. It is provided. The male threaded fastening portion side threaded surface 12a is a threaded portion having a predetermined height from the outer circumferential surface of the male threaded fastened portion 10a, and has a circumferential angle of 30 ° from the outer circumferential surface of the male threaded fastened portion 10a. Occupy and three are formed symmetrically around the entire circumference. The male thread-joint side threaded face 14a is a threadless portion, each of which occupies a circumferential angle of 90 °, and is located symmetrically between the male thread-joint side threaded faces 12a of the entire outer circumferential face. . On the outer circumferential surface located at the other end of the outer circumferential surface of the male threaded fastening portion 10a at the other end of the one that enters the female threaded fastening portion 20a, a single row of total threads are arranged along the same trajectory on the side of the male threaded fastening portion 10a. The male thread forming-fastening part side forward screw part 16a in which this was formed is formed. The number of threads of the male thread-fastening portion side forward screw portion 16a may be one or more. Since the position at which the external thread forming portion 16a is formed is the other end of the external thread forming portion 10a, the external thread forming portion 10a can enter the female thread forming portion 20a in a straight line as will be described later. .

The female threaded fastening portion 20a is a female threaded fastening side threaded surface 22a having a thread formed along the female threaded fastened side threaded spiral on the inner circumferential surface and a female threaded fastened side threaded surface at which no thread is formed 24a. It is provided.

The female threaded fastening portion side threaded surface 22a is a threaded portion having a predetermined height from the inner circumferential surface of the female threaded fastened portion 20a, and has a circumferential angle of 30 ° of the inner circumferential surface of the female threaded fastened portion 20a. Occupies and three are formed symmetrically on the entire inner peripheral surface. The female threaded fastening portion side threaded surface 22a is formed in a range corresponding to the male threaded fastened portion side threaded surface 14a so that the male threaded fastened portion 10a can enter the female threaded fastened portion 20a in a straight line. do. The female thread-joint side thread-free surface 24a is a portion in which no thread is formed, each of which occupies a circumferential angle of 90 ° and is located symmetrically between the female thread-joint-side threaded surface 22a of the entire inner circumferential surface. . A female screw formed with one row of full-threaded threads along the same female thread-forming fastening side spiral path on the inner one end surface of the female thread-forming fastening portion 20a, which is located at one end of the male thread-forming fastening portion 10a which is reached later upon entry. The formation fastening part side forward screw part 26a is formed. The number of threads of the female threaded fastening portion side forward screw portion 26a may be one or more. The female threaded fastening portion side forward screw portion 26a is formed at one end of the female threaded fastening portion 20a to allow the male threaded fastening portion 10a to linearly enter the female threaded fastening portion 20a as will be described later. will be.

Therefore, when the male thread forming portion side threaded surface 12a of the male thread forming portion 10a and the female thread forming portion side threaded surface 24a of the female thread forming portion 20a are arranged side by side, as shown in FIG. Likewise, the male threaded fastening side threaded surface 12a of the male threaded fastened portion 10a can enter a space formed by the female threaded fastened side threaded surface 24a inside the female threaded fastened portion 20a. have. Similarly, the female threaded fastening portion side threaded surface 22a of the female threaded fastened portion 20a can pass into a space outside the male threaded fastened portion 10a of the male threaded fastened portion 10a. As a result, the male screwing portion 10a may enter the inner space of the female screwing portion 20a by a predetermined length without rotation. The male threaded fastening portion 10a enters straight through the inner space of the female threaded fastening portion 20a so that the thread of the male threaded fastening portion side threaded surface 12a is the female threaded fastening side side screw portion of the female threaded fastened portion 20a. (26a) can not enter straight line anymore, after which the male threaded fastening portion 10a and the female threaded fastening portion 20a are rotated relative to the male threaded fastening portion 10a and the female threaded fastening portion ( Perform the tightening of 20a).

The thread of the male threaded fastening portion 10a was formed along the spiral path of the male threaded fastening side, and the thread of the female threaded fastening part 20a was formed along the female threaded fastening side side spiral trajectory. The spiral on the side of the forming fastening means the trajectory of the threads that can be screwed together. Therefore, all the threads formed in each of the male threaded fastening portion 10a and the female threaded fastening portion 20a can be screwed together.

When disengaging the male threaded fastening portion 10a, the male threaded fastening portion side threaded surface 12a and the female thread of the male threaded fastening portion 10a for disengaging the male threaded fastening portion 10a and the female threaded fastening portion After aligning the female thread-forming fastening side thread unformed surface 24a of the formation-fastening part 20a side by side, the male thread-forming fastening part 10a is pulled out in a straight line to release the coupling. This alignment is facilitated by displaying a leader line in the male threaded fastening portion and the coupling hole as will be described later.

Figure 4 is a side cross-sectional view showing a male threaded fastening portion and a female threaded fastening portion of the screw fastening structure according to the second embodiment of the present invention. As shown in Figure 4, the fastening structure of the screw thread according to the second embodiment of the present invention is composed of a male screw forming portion 10b and a female screw forming portion 20b and shown in Figures 1 to 3 It is the same in most configurations as the fastening structure of the screw thread according to the first embodiment of the. The male thread forming fastening portion 10b and the female thread forming fastening portion 20b of the screw fastening structure according to the second embodiment of the present invention have a male thread forming fastening side thread forming surface 12b and a male thread forming fastening side thread unformed surface ( 14b), the female threaded fastening side threaded surface 22b and the female threaded fastened side threaded threaded surface 24b are provided, except that the male threaded fastened portion 10b and the female threaded fastened portion 20b are male threaded fastened portions. There is a difference in that the side transition screw portion and the female thread forming fastening portion side transition screw portion are not formed.

Even if the male threaded fastening part 10b and the female threaded fastening part 20b are each not formed with the male threaded fastening part side forward screw part and the female threaded fastening part side forward screw part, the male threaded fastening part 10b has an appropriate length of the female threaded fastening part ( 20b) is entered in a straight line, and then the male screw forming portion 10b and the female screw forming portion 20b are rotated relative to each other so that the male screw forming portion 10b and the female screw forming portion 20b are fastened. After the portion 10b and the female screw forming portion 20b are relatively rotated in the disengaging direction and the male screw forming portion 10b is pulled out in a straight line, the male screw forming portion 10b and the female screw forming portion 20b are formed. The bond is released.

5 is a partial perspective view of the container to which the fastening structure of the screw thread according to the second embodiment of the present invention is applied. As shown in FIG. 5, the container to which the fastening structure of the screw thread according to the second embodiment of the present invention is applied forms a male threaded fastening portion at an outer circumference of the discharge port 200 and opens and closes the discharge port 200. It can be applied by forming a female screw-forming fastening portion on the inner side of the substrate. The threaded joints of the male threaded joints and the female threaded joints were right-handed threaded joints.

The female thread-forming fastening part side locking projection 110 is formed at the lower edge of the female thread-forming fastening side thread-forming surface 22b formed on the inner side of the lid 100 based on the inner side of the lid 100.

At the lower end of each male threaded fastening portion side threaded surface 12b formed at the male threaded fastening portion formed at the outer circumference of the discharge port 200 of the container, the male threaded fastening portion side locking projection ( 210 is formed, and the female thread-forming fastening side locking projection insertion groove 220 is formed at the right side of each male thread-forming fastening side locking projection 210 at the lower end of the male thread-forming fastening side screw formation surface 12b.

Accordingly, the lid 100 is positioned side by side with the female thread-forming part side thread-forming face 24b of the inner side of the lid 100 and the male thread-forming part side threading face 12b of the outer circumference of the container outlet 200 in the vertical direction. When entering the lid 100 can be lowered in a straight line while gradually covering the discharge port 200. When the lid 100 is rotated while the lid 100 is completely lowered, the thread of the female thread forming portion 22b of the female thread forming portion 22b of the lid 100 and the male thread forming portion 12b of the male thread forming portion 12b of the container discharge port 200 are formed. While the screw thread of the screw cap 100 is fastened to the container outlet 200.

The female thread forming fastening side insertion protrusion 220 is formed to set a rotation angle to which the lid 100 should rotate to form an appropriate fastening force between the lid 100 and the discharge port 200. That is, when the lid 100 is rotated until the female thread-forming fastening side engaging projection 110 inside the lid 100 is caught by the female thread-forming fastening side engaging projection insertion groove 220 of the outlet 200, the lid 100 is closed. And the outlet 200 is confirmed to have a sufficient fastening force, it is preferable to stop the rotation of the lid 100.

When uncoupling and releasing the lid 100 fastened to the outlet 200, the female thread-forming fastening side locking projection 110 of the female thread-forming fastening portion of the lid 100 is the male thread-forming fastening side locking projection 210 of the outlet 200. Rotating the cap 100 until it is caught) and then pulls the lid 100 upward from the position where the female threaded fastening side engaging projection 110 is caught by the male threaded fastening side engaging projection 210, the lid 100 Decoupling of the discharge port 200 is performed. That is, the female thread-forming fastening side 110 and the male thread-forming fastening side 210 are male thread-forming fastening side thread-forming surface 22b and the male thread-forming fastening side thread-forming surface 14b aligned side by side. It functions to indicate the alignment position where the part or female threaded part can be pulled out in a straight line. In this application example, the male threaded fastening side engaging projection 210 and the female threaded fastening side engaging projection 110 and the female threaded fastening side engaging projection insertion groove 220 are operated by the lid 100 and the discharge port 200 of the container. Applicable when the material is formed of a deformable material.

FIG. 6 is a cross-sectional view showing a tubular packing installed on a lid of a container in which a male screw forming portion and a female screw forming portion of the screw fastening structure according to the second embodiment of the present invention are used. As shown in Figure 6, it is preferable that the tubular packing 150 is formed on the lid 100 of the container using a screw fastening structure according to the second embodiment of the present invention. The fastening structure of the screw thread according to the present invention needs attention to airtightness because the thread forming the screw connection is not a full screw formed all around the 360 degree. Therefore, it is necessary to ensure the airtightness between the lid 100 and the discharge port 200 shown in Figure 5 by using a disk-shaped packing 150 of the disk form filled with air therein.

The edge circumference of the tubular packing 150 in which air is filled in the state in which the lid 100 and the outlet 200 are fastened is tightly sealed between the end of the outlet 200 and the upper end of the inner side of the lid 100. The center portion of the tubular packing 150 is convexly inflated as it is compressed around the edge of the tubular packing 150.

7 is a perspective view showing a handle of a door to which a screw fastening structure according to a second embodiment of the present invention is applied. As shown in FIG. 7, the handle 300 of the door to which the fastening structure of the screw thread according to the second embodiment of the present invention is applied comprises an internal thread-forming fastening portion of the inner side of the coupling hole 301 of the handle 300. It can be applied by configuring the fixing piece 310 as a male threaded fastening portion.

At this time, the outer periphery of the fixing piece 310 is formed with a male thread forming portion side thread forming surface 12b and a male thread forming portion connecting thread unformed surface 14b, respectively, each of the coupling holes 301 of the handle 300. ), Two female thread forming fastening side thread forming surfaces 22b and two female thread forming fastening side thread unforming surfaces 24b are formed.

After the alignment piece 310 is aligned with the coupling hole 301 of the handle 300 by the method described with reference to FIG. 2, the fixing piece 310 is linearly aligned with the coupling hole 301 of the handle 300 of the device. When the fixing piece 310 is rotated after entering, the female thread-forming fastening side screw formation of the threaded hole formed in the male thread-forming fastening side thread-forming surface 12b of the fixing piece 310 and the handle 300 is formed. A screw thread formed on the surface 22b is screwed to fasten the fixing piece 310 to the coupling hole 301 of the handle 300.

When releasing the fixing piece 310 from the coupling hole 301 of the handle 300, the coupling hole 301 of the male thread forming fastening side-side thread forming surface 12b and the handle 300 of the fixing piece 310. The female thread-forming fastening side side thread-forming surface 24b of () is rotated to align the fixing piece 310 to face, and then the fixing piece 310 is pulled out in a straight line to release the coupling. Alignment of the fixing piece 310 is facilitated by displaying a leader line in the coupling hole 301 of the fixing piece 310 and the handle 300, the male threaded fastening portion is formed as will be described later.

8 is a side cross-sectional view showing the male threaded fastening portion and the female threaded fastening portion of the screw fastening structure according to the third embodiment of the present invention. As shown in FIG. 8, the fastening structure of the screw thread according to the third embodiment of the present invention includes a male threaded fastening part 10c and a female threaded fastening part 20c, and a thread formed in the male threaded fastening part 10c. This length is characterized by a very short length.

The male threaded fastening portion 10c is alternately formed with the male threaded fastening portion side threaded surface 12c having a thread formed on the outer circumferential surface and the male threaded fastened side threaded surface 14c without the thread formed therein, and is male threaded. It is characterized in that the circumferential length of the thread formed on the fastening portion side threaded surface 12c is very short. As a result, the male thread-joint part side thread-forming surface 12c occupies a relatively small area compared with the male thread-joint part side thread-forming surface 14c.

The female threaded fastening portion 20c has a female threaded fastening portion side threaded surface 24c formed in an area of the inner circumferential surface corresponding to the male threaded fastening portion side threaded surface 12c of the male threaded fastened portion 10c. A female thread forming portion side thread forming surface 22c is formed in a region corresponding to the male thread forming portion connecting threadless surface 14c of the male thread forming portion 10c.

The shapes of the screws formed on the male threaded fastening portion 10c and the female threaded fastening portion 20c may be formed opposite to each other. In other words, the female thread-forming fastening side thread-forming surface formed on the female thread-forming fastening part 20c may be formed in a short section circumferentially, and the female thread-forming fastening side thread-forming surface may be formed in a relatively circumferentially long section.

9 is a side cross-sectional view showing the male threaded fastening portion and the female threaded fastening portion of the screw fastening structure according to the fifth embodiment of the present invention. As shown in Fig. 9, the fastening structure of the screw thread according to the fifth embodiment of the present invention is composed of a male screw forming portion 10d and a female screw forming portion 20d.

The male threaded fastening portion 10d is the male threaded fastening portion side threaded surface 12d and the threaded line in which a thread is formed at a portion of the circumferential direction in the front portion that first enters the female threaded fastened portion 20d in the longitudinal direction from the outer circumferential surface thereof. 14d of unthreaded male threaded fastening part side thread formation surfaces are alternately formed, and the male threaded fastening part side forward screw part 16d by which the total thread was formed all over the circumference | surroundings by the predetermined number of lines is formed in the back part. . The male threaded fastening portion side threaded surface 12d has a trapezoidal shape when projected onto one plane.

The female threaded fastening portion 20d corresponds to the male threaded fastening portion side threaded surface 12d of the male threaded fastened portion 10d at an end where the male threaded fastened portion 10d enters from the inner circumferential surface in the longitudinal direction. Female thread-forming fastening side thread-forming side 24d is formed in the region where the female thread-forming fastening side thread unformed surface is formed, and a thread is formed along the female thread-forming fastening side-helical trajectory in the region corresponding to the male thread-forming fastening side thread-unshaping surface 14d. The surface 22d is formed. The female thread-forming fastening side-side thread part 26d in which the total thread is formed in the circumferential circumference by a predetermined number of rows in the lateral direction of the female thread-forming fastening side thread-forming surface 22d and the female thread-forming fastening side thread-less surface 24d. ) Is formed.

The threads formed on the male threaded fastening portion 10d are formed along one male threaded fastener side spiral orbit, and the threads formed on the female threaded fastened portion 20d are formed along one female threaded fastened side side spiral orbit. The threads formed on the spiral orbit and the female orbital threaded side orbit can be mutually screwed together.

In the screw fastening structure according to the fifth embodiment of the present invention, after the front portion of the male threaded fastening portion 10d enters the female threaded fastening portion 20d in a straight line, the male threaded fastening portion 10d and the female screw formation are thereafter. The fastening is performed by the relative rotation of the fastening portion 20d. Accordingly, in the process of linearly inserting the male threaded fastening portion 10d into the female threaded fastening portion 20d, an advantage of easily aligning the threads of the male threaded fastening portion 10d and the female threaded fastening portion 20d for fastening is provided. have. When uncoupling, rotate the male threaded tightening part 10d and the female threaded tightening part 20d, and then align the male threaded tightening part 10d and the female threaded tightening part 20d after passing the former threaded part. The male threaded fastening portion 10d is pulled out in a straight line to be disengaged.

10 is a side cross-sectional view showing the male threaded fastening portion and the female threaded fastening portion of the screw fastening structure according to the sixth embodiment of the present invention. As shown in FIG. 10, the fastening structure of the screw thread according to the sixth embodiment of the present invention is composed of a male screw forming portion 10e and a female screw forming portion 20e, the fifth embodiment shown in FIG. The same as in most of the fastening structure of the screw according to the screw structure, except that the shape of the male threaded fastening portion side threaded surface (12e) of the male threaded fastening portion (10e) and the male threaded fastening portion side threaded surface 14e determined accordingly ), There are differences in the shapes of the female thread-forming fastening side thread-forming surface 22e and the female thread-forming fastening side thread-less surface 24e. The male threaded fastening side 10e of the male threaded fastening part 10e becomes a triangle when projected onto one plane, and the male threaded fastening side is determined as the shape of the male threaded fastening side 12e is determined. The shapes of the unthreaded surface 14e, the female threaded joint side threaded surface 22e and the female threaded jointed side thread unformed surface 24e are also formed to match the shapes of the male threaded jointed side threaded surface 12e. do.

11 is a side cross-sectional view showing a male thread forming portion and a female thread forming portion of a screw fastening structure according to the seventh embodiment of the present invention. As shown in FIG. 11, the fastening structure of the screw thread according to the seventh embodiment of the present invention includes a male screw forming portion 10f and a female screw forming portion 20f.

The male threaded fastening portion 10f is the male threaded fastening portion side threaded surface 12f on which the thread is formed along the male threaded fastening side spiral path in the outer circumferential surface and the male threaded fastened side threaded surface on which the thread is not formed ( 14f) are alternately formed, and at the rear, a male thread-forming fastening side-side forward screw portion 16f in which a total thread is formed by a predetermined number of rows along the male thread-forming fastening side-side spiral trajectory is formed.

The female threaded fastening portion 20f is located at the male threaded fastening portion side threaded surface 12f of the male threaded fastened portion 10f at the rear side of the inner circumferential surface at which the male threaded fastened portion 10f enters. A female thread forming and fastening side threaded surface 24f is formed in a corresponding region and a female thread forming and fastening side threaded orbit is formed in an area corresponding to the male threaded and fastening side threaded surface 14f of the male threaded and fastening portion 10f. Accordingly, the female thread forming fastening side threaded surface 22f having a thread is formed. In the inner circumferential surface of the female threaded fastening portion 20f, both the circumferential circumference of the female threaded fastening side threaded surface 22f and the female threaded fastening side screw threaded surface 24f is located along the female threaded fastened side threaded orbit. A female thread-forming fastening side-side forward threaded portion 26f having a front thread formed therein is formed, and a female thread-forming fastening side-side threaded surface formed behind the female thread-forming fastening side-side forward screwing portion 26f in front of the female thread-forming fastening-side forward screwing portion 26f. The female thread forming fastening side thread forming surface 22f and the female thread forming fastening side thread unshaping surface 24f are further formed in the same circumferential region as 22f and the female thread forming fastening side thread unforming surface 24f.

The method of fastening the male screw forming portion 10f and the female screw forming portion 20f is initially performed by the male screw forming portion 10f of the male screw forming portion 10f and the female screw forming portion 20f. Female threaded fastener side threaded non-facing surface 24f is aligned with male threaded fastener 10f straight into female threaded fastener 20f, and then female threaded fastener side transverse threaded part 26f of female threaded fastener 20f is formed. After reaching), the male threaded fastening part 10f and the female threaded fastening part 20f are rotated relative to each other until the front of the male threaded fastening part 10f passes through the female threaded fastening part 20f.

Female thread formation of the male-threaded fastening side-side thread-forming surface 14f and the female thread-forming fastening portion 20f of the male-threaded fastening portion 10f while the male-threaded fastening portion 10f and the female screw-forming fastening portion 20f are fastened. Aligning the male threaded fastening portion 10f and the female threaded fastening portion 20f so that the fastening portion side unthreaded surface 24f faces the male threaded fastening portion side threaded surface 14f of the male threaded fastening portion 10f. A gap is formed between the female thread forming and fastening side thread unformed surface 24f of the female thread forming and fastening portion 20f, so that the stopper 30 to be described later can be inserted.

12 is a perspective view showing a stopper that can be used in the fastening structure of the screw thread according to the seventh embodiment of the present invention, Figure 13 is a view showing a state of use of the stopper shown in FIG. As shown in FIG. 12, the stopper 30 has a first support piece 31 and a second support piece 33 and the first support piece 31 and a second support piece having one end spaced apart and connected at the other end. (33) It comprises the support wire 32 formed in the edge of each end.

The first support piece 31 is formed as a curved surface having a width corresponding to the arc length of the male thread-forming fastening side side unthreaded surface 14f of the male thread-forming fastening portion 10f, and the curved surface is the male thread-forming fastening side screw. It has the same curvature as that of the unformed surface 14f. This is because when the first support piece 31 is formed with the same curvature as the curvature of the male thread-joint part side thread-forming surface 14f, it is in close contact with the male thread-joint part-side thread-forming surface 14f. However, even if the curvature of the first support piece 31 does not coincide with the curvature of the male threaded fastener side thread unformed surface 14f, the first support piece 31 is inserted into the male threaded fastener-side thread unformed surface 14f. If this is possible, it does not matter if there are some differences in curvatures.

The second support piece 33 is formed as a curved surface having a width corresponding to the arc length of the female thread-forming fastening side-side thread-forming surface 24f of the female thread-forming fastening part 20f, and the curved surface is the female thread-forming fastening side screw. It has the same curvature as that of the unformed surface 24f.

The first support piece 31 and the second support piece 33 are connected to each other at each other end so that one end thereof is spaced apart from each other, and elastic deformation may be performed so as to reduce the distance from each other.

Support wires 32 bent downward are formed at both edges of each of the first support piece 31 and the second support piece 33. The stopper 30 can also be used in the form of a magnetic force in order to prevent separation after insertion.

As shown in FIG. 13, between the male thread forming fastening side thread unformed surface 14f of the male thread forming fastening part 10f and the female thread forming fastening side threadless forming surface 24f of the female thread forming fastening part 20f. When the stopper 30 is inserted into the gap, both support wires 32 of the second support piece 33 positioned below are caught by the thread formed on the male threaded fastening side threaded surface 12f of the male threaded fastening portion 10. The stopper 30 does not fall out and the stopper 30 can no longer rotate the male threaded portion 10 and the female threaded portion 20 relative to each other. In addition, when removing the stopper 30, the support wire 32 formed on the first support piece 31 can be pulled out using tweezers or the like to easily remove the stopper 30.

The first support piece 31 and the second support piece 33 are elastically deformable stopper 30 has an advantage that does not fall well even when vibration occurs when applied to the screw fastening structure.

14 is a view showing a wire bolt coupling structure to which the screw fastening structure according to the second embodiment of the present invention, Figure 15 is a side cross-sectional view of the wire bolt coupling structure shown in FIG. As shown in Figure 14 and 15, the anchor bolt 420 and the wire bolt 440 installed on the ceiling 410 is formed with a male threaded fastening portion of the screw fastening structure according to the second embodiment of the present invention, The hollow joint 430 and the nut 450 are formed with female threaded fastening portions of the screw fastening structure according to the second embodiment of the present invention.

Insert the flat washer 422 and the spring washer 424 to the anchor bolt 420 protruding from the ceiling surface, and after coupling the nut 450 and fixing the nut 450 to the anchor bolt 420 with the stopper 30 After coupling the joint 430 to the bottom of the anchor bolt 420 and fastening the wire bolt 440 to the bottom of the joint 430, the stopper 30 between the bottom of the joint 430 and the wire bolt 440. ) To fix the wire bolts 440 to the joint 430.

Pass the coupling hole of the object 460 to be supported at the lower end of the wire bolt 440, and then fasten the nut 450 to the lower end of the wire bolt 440 exposed below the coupling hole, and then The stopper 30 is inserted by aligning the wire bolt 440 and the nut 450 so that the unformed surface 14b and the female thread-forming fastening side-side thread unformed surface 24b face each other.

In the wire bolt coupling structure described above, the fastening method between the anchor bolt 420, the nut 450, the joint 430, the wire bolt 440 is the same as the screw fastening structure according to the second embodiment of the present invention Of course, the method of fastening at once after entering the phase is applied in the same way.

16 is a plan view and a side view showing one example of a washer that can be used in the fastening structure of the screw thread according to the first to seventh embodiments of the present invention. As shown in Figure 16, the washer 40 that can be used in addition to the fastening structure of the screw thread according to the first to sixth embodiments of the present invention is a wave shape bent alternately up and down circumferentially, In the convex portion, the scratches 42 are formed so that irregularities are formed to improve frictional force.

17 is a plan view and a side view showing another example of the washer that can be used in the fastening structure of the screw thread according to the first to seventh embodiments of the present invention. As shown in Fig. 17, the washer 50 of another structure which can be used in the fastening structure of the screw thread according to the first to sixth embodiments of the present invention is a hemispherical protrusion alternately on the upper and lower surfaces of the circumference 52 is formed.

When the close contact is made on both sides of the washer 50, the hemispherical protrusion 52 of the washer 50 increases the friction force while plastic deformation.

18 is a state diagram illustrating a state where a washer and a stopper are additionally used in a fastening structure of a screw thread according to a seventh embodiment of the present invention. The male threaded fastener 10f and the female threaded fastener 20f shown in FIG. 18 are the female threaded fastener 20f and the male threaded fastener 10f according to the screw fastening structure of the seventh embodiment of the present invention. . After passing the male threaded fastening portion 10f through the coupling holes of the members 510 and 520 to be fastened, after positioning the washer 50 and tightening the female threaded fastening portion 20f, the male threaded fastening portion 10f is provided. ) And the stopper 30 shown in FIG. 12 are inserted with the female threaded fastening portion 20f aligned. As a result, the fastening of the male threaded fastening portion 10f and the female threaded fastening portion 20f is primarily maintained by the washer 50, and the fastening is maintained by the stopper 30 secondly. In addition, in order to improve aesthetics, the lower end of the male threaded fastening portion 10f may be covered with a cap 60 having a magnet 62 embedded therein.

FIG. 19 is a view showing male threaded fasteners and female threaded fasteners in which a leader line of a screw fastening structure according to the first to seventh embodiments of the present invention is added. As shown in Fig. 19, the male threaded fastening portion 10b and the female threaded fastening portion 20b of the screw fastening structure according to the first to seventh embodiments of the present invention are male threaded fastening portions at the time of linear entry. It is preferable to indicate the indicator lines 18 and 28 with arrows to confirm the alignment between the 10b and the female threaded fastening portion 20b.

20 is a side cross-sectional view showing the male threaded fastening portion and the female threaded fastening portion of the screw fastening structure according to the eighth embodiment of the present invention. As shown in FIG. 20, the male screw forming portion 10g and the female screw forming portion 20g of the screw fastening structure according to the eighth embodiment of the present invention are the second embodiment of the present invention shown in FIG. It is the same in most configurations and the fastening structure of the screw according to.

However, each of the circular arc circumferences of the male thread-forming fastening side thread-forming surface 12g and the male thread-forming fastening side thread-free surface 14g of the male thread-forming fastening portion 10g of the screw fastening structure according to the eighth embodiment of the present invention. They are formed in a quarter of the length of the circumference of the male threaded fastening portion 10g, and the female threaded fastening side threaded surface 22g and the female threaded fastened side thread unformed surface (24g) of the female threaded fastened portion 20g. Each arc circumference of the) is different in that it is formed in a quarter of the length of the circumference of the female threaded fastening portion (20g).

21 is a side cross-sectional view showing a light bulb and a socket to which a fastening structure of a screw thread according to a second embodiment of the present invention is applied. As shown in FIG. 21, the bulb 610 to which the fastening structure of the screw thread according to the second embodiment of the present invention is applied is formed with a male threaded fastening portion 10b at an end coupled with the socket 620, and a male threaded portion is formed. The arc length of the male threaded fastening side threaded surface 12b of the fastening portion 10b is formed by 1/6 of the circumference of the circumferential length of the male threaded fastened portion 10b, and of the male threaded fastened side threaded surface 14b. The arc length is formed by 2/6 of the circumferential circumference length of the male threaded fastening portion 10b.

In the socket 620 to which the screw fastening structure according to the second embodiment of the present invention is applied, a female thread forming portion 20b is formed at an inner circumference of a portion that is coupled to an end of the bulb 610, and a female screw forming portion ( The circular arc length of the female threaded fastening side threaded surface 22b of 20b) is formed by 1/6 of the circumferential circumference length of the female threaded fastened side 20b, and the circular arc length of the female threaded fastened side threaded surface 24b is It is formed by 2/6 of the circumference of the female threaded fastener.

Therefore, the male threaded fastening side threaded surface 12b of the male threaded fastened portion 10b of the light bulb 610 is connected to the female threaded fastened side threaded surface 24b of the female threaded fastened portion 20b of the socket 620. After the light bulb 610 enters the socket 620 in a straight line in a state aligned side by side, and rotates only once, the coupling between the light bulb 610 and the socket 620 is completed.

The fastening structure of the screw thread according to the present invention is applicable to all the components to which the conventional screw connection is applied, which is, for example, screw structures not illustrated, including a fixing piece for fixing the product, the container and the lid of the container, etc. All can be applied.

In addition, it is preferable that the threads formed in the fastening structure of the screw according to the present invention are chamfered and formed into a smooth curved surface in consideration of the ease of fastening.

The number of threads of the male threaded fastening side threaded surfaces and the female threaded fastened side threaded surfaces in the embodiments of the present invention is merely an example, and thus the number of threads of the threads can be varied. . In addition, the number of male threaded fastening portions and female threaded fastening side threaded surfaces and the female threaded fastening side threaded surfaces may be variously applied according to the use environment.

Also, the threaded surfaces and the non-threaded surfaces of the male threaded portion and the female threaded portion may be formed symmetrically or asymmetrically.

In addition, the locking projections and the locking projection insertion grooves formed in the male screw forming portion and the female screw forming portion of the screw fastening structure according to the present invention shown in FIG. 5 are applied to the fastening structure of the container and the lid shown in FIG. The present invention is not limited thereto, and may be applied to any fastening structure to which the screw fastening structure according to the present invention may be applied, including the light bulb and the socket shown in FIG. 21.

In addition, the screw fastening structure according to the present invention can be applied to any fastening structure including a device, a product, a building fastening portion, etc. having a screwing fastening structure.

1 is a perspective view showing a male thread forming portion and a female screw forming portion of a screw fastening structure according to the first embodiment of the present invention;

Figure 2 is a side cross-sectional view showing a male threaded fastening portion and a female threaded fastening portion of the screw fastening structure according to the first embodiment of the present invention,

3 is a cross-sectional plan view showing the male thread forming portion and the female thread forming portion of the screw fastening structure according to the first embodiment of the present invention;

Figure 4 is a side cross-sectional view showing a male threaded fastening portion and a female threaded fastening portion of the screw fastening structure according to the second embodiment of the present invention,

5 is a partial perspective view of a container to which a screw fastening structure according to a second embodiment of the present invention is applied,

6 is a cross-sectional view showing a tubular packing installed on a lid of a container in which a male screw forming portion and a female screw forming portion of a screw fastening structure according to the second embodiment of the present invention are used,

7 is a perspective view showing a handle of a door to which a screw fastening structure according to a second embodiment of the present invention is applied,

8 is a side cross-sectional view showing a male thread forming portion and a female thread forming portion of a screw fastening structure according to a third embodiment of the present invention;

9 is a side cross-sectional view showing a male threaded fastening portion and a female threaded fastening portion of a screw fastening structure according to a fifth embodiment of the present invention;

10 is a side cross-sectional view showing a male thread forming portion and a female thread forming portion of a screw fastening structure according to a sixth embodiment of the present invention;

11 is a side cross-sectional view showing a male thread forming portion and a female thread forming portion of a screw fastening structure according to the seventh embodiment of the present invention;

12 is a perspective view showing a stopper that can be used in the fastening structure of the screw thread according to the seventh embodiment of the present invention,

FIG. 13 is a view illustrating a use state of the stopper shown in FIG. 12;

14 is a view showing a wire bolt coupling structure to which the fastening structure of the screw thread according to the second embodiment of the present invention is applied,

15 is a side cross-sectional view of the wire bolt coupling structure shown in FIG.

16 is a plan view and a side view showing one example of a washer that can be used in the fastening structure of the screw thread according to the first to seventh embodiments of the present invention,

17 is a plan view and a side view showing another example of the washer that can be used in the fastening structure of the screw thread according to the first to seventh embodiments of the present invention,

18 is a state diagram showing a state in which a washer and a stopper 30 are additionally used in the fastening structure of the screw thread according to the seventh embodiment of the present invention.

FIG. 19 is a view showing male threaded fasteners and female threaded fasteners in which a leader line of a fastening structure of a screw thread according to the first to seventh embodiments of the present invention is added;

20 is a side cross-sectional view showing a male thread forming portion and a female thread forming portion of a screw fastening structure according to an eighth embodiment of the present invention;

21 is a side cross-sectional view showing a light bulb and a socket to which a fastening structure of a screw thread according to a second embodiment of the present invention is applied.

Explanation of the major references

10a: male thread-fastening part 12a: male thread-fastening part

14a: Male thread-joint side side Unthreaded face 16a: Male thread-joint side side Full thread part

20a: Female threaded fastener 22a: Female threaded fastener

24a: female thread-joint side side unthreaded face 26a: female thread-joint side side forward threaded part

Claims (9)

A portion of the outer circumferential surface corresponding to the predetermined circumferential angles is provided with a male threaded fastening portion side threaded surface formed with a thread along a spiral path on the male threaded fastening side side, and the screw thread is provided at a portion other than the male threaded fastened side threaded surface. A male thread forming portion having an unthreaded male thread-forming portion side thread-forming surface; And A portion of the inner circumferential surface corresponding to the male thread-forming fastening side screw thread-forming surface is provided with a female thread-forming fastening side thread-forming surface having a thread formed along a spiral thread on the female thread-forming fastening side side, except for the female thread-forming fastening side thread-forming surface. Includes a female thread forming portion having a female thread forming portion at the side at which the screw thread is not formed, and an unthreaded surface. The male threaded fastener is a male threaded fastener formed with a total number of threads along a spiral line on the male threaded fastener side of the outer end surface of the other end of the outer circumferential surface of the outer end of the outer end which is opposite to the one end that enters the female threaded fastened part Negative side screw part is further formed, The female threaded fastening portion is a female threaded fastening portion of the inner circumferential surface of the female threaded fastening portion side of the inner circumferential surface of the end that reaches later when the male threaded fastening portion enters a predetermined number of lines along the trajectory on the female threaded fastening side Is formed more, And the male screw forming portion enters and tightens the female screw forming portion in a state where the male thread forming portion side thread forming surface and the female thread forming portion attaching side thread forming surface are located side by side. The male threaded fastening side threaded surface is provided with a male threaded fastening side side threaded line formed along the spiral path of the male threaded fastening side on a portion of the circumferential direction of the outer circumferential surface located in the front portion which enters the female threaded fastening portion of the entire length. A portion of the male thread forming portion that is not formed is provided with a male screw forming portion that has no thread formed on the side except for the thread forming surface, and the male thread is formed on the outer circumferential surface located behind the front portion of the entire length. A male screw forming fastening part provided with a male screw forming fastening part side forward screw part in which a total number of threads are formed along a predetermined fastening side side spiral trajectory; And A female thread formation portion formed with a female thread forming portion side thread along the female thread forming portion side spiral path in a portion corresponding to the male thread forming portion side thread forming surface among the inner circumferential surfaces located in the rear portion that is the side into which the male thread forming portion enters. A fastening part side thread forming surface is provided, except for the female thread forming fastening side thread forming surface, the female thread forming fastening side part is not provided with a female thread forming fastening side thread unformed surface, and the rear part of the entire length is provided. The inner circumferential surface located in front of the female threaded fastening portion includes a female threaded fastening portion provided with a female threaded fastening portion side forward screw portion in which a total thread is formed by a predetermined number of rows along the spiral path of the female threaded fastening portion side, And the male screw forming portion enters and tightens the female screw forming portion in a state where the male thread forming portion side thread forming surface and the female thread forming portion attaching side thread forming surface are located side by side. The method of claim 2, The male threaded fastening portion side threaded surface is a shape that is projected on one plane is a screw thread, characterized in that the rectangular, trapezoidal or triangular. The method of claim 3, wherein The shape through which the male thread forming portion side thread forming surface is projected on one plane is rectangular, The female thread-forming fastening side thread-forming surface and the female thread-forming fastening side thread-forming surface are further formed at the same circumferential position in front of the female screw-forming fastening side forward screw portion among the inner circumferential surfaces of the female thread-forming fastening portion, In the state where the male thread forming portion and the female screw forming portion are fastened, the male screw forming portion side thread unformed surface and the female screw forming portion side forward thread portion in front of the female thread forming portion fastening side thread unformed surface face each other. And a stopper is inserted into a space between the male thread forming portion at the side of the male thread forming portion and the female thread forming portion at the side of the thread forming surface. A portion of the outer circumferential surface corresponding to the predetermined circumferential angles is provided with a male threaded fastening portion side threaded surface formed with a thread along a spiral path on the male threaded fastening side side, and the screw thread is provided at a portion other than the male threaded fastened side threaded surface. A male thread forming portion having an unthreaded male thread-forming portion side thread-forming surface; And A portion of the inner circumferential surface corresponding to the male thread-forming fastening side screw thread-forming surface is provided with a female thread-forming fastening side thread-forming surface having a thread formed along a spiral thread on the female thread-forming fastening side side, except for the female thread-forming fastening side thread-forming surface. Includes a female thread forming portion having a female thread forming portion at the side at which the screw thread is not formed, and an unthreaded surface. The bottom edge of the male thread-forming part side thread-forming surface or the bottom edge of the female thread-forming fastening side-side thread forming surface is further formed with a locking projection, And the male screw forming portion enters and tightens the female screw forming portion in a state where the male thread forming portion side thread forming surface and the female thread forming portion attaching side thread forming surface are located side by side. The method of claim 5, wherein Threading fastening structure, characterized in that the locking projection insertion groove is further formed on the lower edge of the male threaded fastening portion-side threaded surface or the lower edge of the female threaded fastening portion-side threaded surface. A portion of the outer circumferential surface corresponding to the predetermined circumferential angles is provided with a male threaded fastening portion side threaded surface formed with a thread along a spiral path on the male threaded fastening side side, and the screw thread is provided at a portion other than the male threaded fastened side threaded surface. A male thread forming portion having an unthreaded male thread-forming portion side thread-forming surface; And A portion of the inner circumferential surface corresponding to the male thread-forming fastening side screw thread-forming surface is provided with a female thread-forming fastening side thread-forming surface having a thread formed along a spiral thread on the female thread-forming fastening side side, except for the female thread-forming fastening side thread-forming surface. Includes a female thread forming portion having a female thread forming portion at the side at which the screw thread is not formed, and an unthreaded surface. The male thread forming portion enters and engages the female thread forming portion in a state where the male thread forming portion side thread forming surface and the female thread forming portion attaching side thread non-forming surface are positioned side by side. And the leader lines indicative of the male thread-forming fastening side thread-forming surface and the female thread-forming fastening side thread-less forming surface are further formed on the male thread-forming fastening portion and the female thread-forming fastening portion. It is used in the fastening structure of the screw thread according to any one of claims 1 to 7, A first support piece formed of a curved surface having a width corresponding to the arc length of the male thread forming portion at the threaded portion forming side of the male thread forming portion; A second support piece formed of a curved surface having a width corresponding to an arc length of the female thread forming portion at the threaded portion at the female thread forming portion; And  A support wire formed at both ends of one end of each of the first support piece and the second support piece and bent downward; The first support piece and the second support piece is a stopper for use in the fastening structure of the screw thread, characterized in that the other end is located on the opposite side to each one end of the support wire is formed so that each end is spaced from each other. The method of claim 8, The curved surface of the first support piece is formed with the same curvature as the curvature of the male thread-joint portion side thread-free surface, And said curved surface of said second support piece is formed to have the same curvature as that of said female thread forming and fastening side thread unformed surface.

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