JPH0647722U - Fastening unit - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a fastening unit whose fastening state does not change with time once fastened. [Structure] A bolt 10 and a fastening body 20 for screwing the bolt 10 together. The bolt 10 has a slit portion 11 at an end portion on a screwing side 10a, and the fastening body 20 screws the bolt 10 therein. It is composed of a screwing portion 21 to be engaged with each other and a projection 22 provided at a position facing the screwing portion 21 and continuous with the screwing portion 21.
By pressing the projection 22 against the slit portion 11 and expanding the slit portion 11, once tightened, the tightened state does not change with time, that is, it becomes possible to completely prevent loosening of the bolt. ing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fastening unit, and more particularly to a fastening unit that is used, for example, when fastening a flange portion of a pipe material that conveys a fluid, a gas, or the like, and that once fastened, the fastening state does not change with time.

[0002]

[Prior art]

 Conventionally, a spring washer S is used as shown in FIG. 5 (a) or a double nut W is used as shown in FIG. 5 (b) as a loosening prevention means in a fastening portion using a bolt B and a nut N. It is common to have However, in the loosening prevention means as described above, for example, when vibration of a pump, a boiler, or the like, which is a supply source thereof, is transmitted to a pipe material that conveys gas or liquid, the flanges of the connecting portion are fastened. If the nut loosens over time and is extremely severe, the gas or liquid flowing in the pipe may leak out and a secondary disaster may occur.In addition, the heat generated from the wiring in the power of the electric system or the control panel, etc. may occur. As a result, the nut holding the terminal terminal expanded and contracted and became loose, necessitating regular tightening work.

[0003]

[Problems to be solved by the device]

 Therefore, in order to solve these problems, a cotter pin P may be used as shown in FIG. 5 (c), but this means, as shown in the figure, is a hole H for inserting the cotter pin P. The current situation is that there are still many problems, such as having to process the bolt B into the bolt B beforehand or in the field. The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a fastening unit whose fastening state does not change with time when fastened overnight.

[0004]

[Means for Solving the Problems]

 The present invention for achieving the above object comprises a bolt and a fastening body for screwing the bolt. The bolt has a slit portion at an end portion on a screwing side, and the fastening body screws the bolt. It is composed of a screwing part to be fitted and a projection provided at a position opposite to the screwing part, and when the bolt is screwed into the fastening body, the projection is pressed against the slit part, and the slit is formed. The feature is that the part is expanded.

[0005]

[Action]

 In the present invention configured as described above, when the bolt is threadedly fastened to the fastening body, the projection provided on the fastening body is fitted in the slit portion provided at the screwing side end portion of the bolt. By pressing and expanding the slit portion, once tightened, the tightened state does not change with time, that is, loosening of the bolt tightening can be completely prevented.

[0006]

【Example】

 Hereinafter, the present invention will be described with reference to the drawings by embodiments. 1 is a perspective explanatory view showing a first embodiment of the present invention, FIG. 2 is a perspective explanatory view showing a second embodiment of the present invention, FIG. 3 is a perspective explanatory view showing a third embodiment of the present invention, and FIG. (A), (b), (c) is a partially cutaway front view explanatory view for explaining the fastening procedure based on the first embodiment shown in FIG. 1. In the figure, E is a fastening unit according to an embodiment of the present invention, which comprises a bolt 10 and a fastening body 20 for screwing the bolt 10, and the bolt 10 has a slit portion 11 at an end of a screwing side 10a. The fastening body 20 includes a screwing portion 21 for screwing the bolt 10 and a projection 22 provided at a position facing the screwing portion 21 and facing the screwing portion 21. With the threaded fastening to the fastening body 20, the projection 22 is pressed against the slit portion 11 and the slit portion 11 is expanded to once open, so that the fastening state does not change with time, that is, by the bolt. It is possible to completely prevent loosening of the fastening.

To further explain this structure, in the first embodiment shown in FIG. 1, the fastening body 20 includes a left side wall 23 and a right side wall 24, which are located in the screwing fastening direction of the bolt 10, as shown in the figure. , Which are integrally formed to face each other with a space provided therebetween, the left side wall 23 is provided with an insertion hole 25 for the bolt 10, and the inside of the right side wall 24 is directed toward the center of the insertion hole 25. The protrusion 22 is provided. The distance between the connecting portions 27 and 28 for connecting the upper and lower opposite sides of the left and right side walls 23 and 24 to each other is set to the distance L that can prevent the nut 26 fastened to the bolt 10 from rotating. is there.

Also, in the case of the second embodiment shown in FIG. 2, the structure of the fastening body 20 is almost the same as that of the first embodiment described above, but in the case of this embodiment, the screwing portion 21 is used as the first embodiment. As in the example, a normal nut 26 that is generally used is not used, but a fastening member 29 in which a screw hole that matches the insertion hole 25 is opened inside the insertion hole 25 provided in the left side wall 23 of the fastening body 20. Are integrally attached by means such as welding. Therefore, in this embodiment, unlike the first embodiment described above, the commonly used normal nut 26 is not required. As a result, the number of independent components can be reduced, the component management cost can be reduced, and the workability of the fastening work can be improved.

Further, in the third embodiment shown in FIG. 3, the structure of the fastening body 20 is almost the same as that of the first embodiment described above. In the case of the first embodiment, as the fastening means for the bolt 10 and the fastening body 20, the independent normal nut 26 is used as described above, but in the case of this embodiment, the fastening is performed as shown in the drawing. A normal nut 26 is integrally attached to the inside of an insertion hole 25 provided on the left side wall 23 of the body 20 by welding or the like so that the insertion hole 25 and the screw hole are aligned with each other. Therefore, in this embodiment as well as in the second embodiment described above, it is possible to reduce the parts management cost and improve the workability of the fastening work, while welding the normal nut 26 as the screwing portion 21. Since it is integrally attached by means such as the above, the manufacturing cost can be reduced as compared with the second embodiment described above.

Next, with reference to FIGS. 4 (a), 4 (b), and 4 (c), a process of fastening the attached portion (flange portion in this embodiment) using the fastening unit E will be described. First, the bolt 10 is inserted into the fastening holes of the left and right flange portions Fa and Fb via the washer 30, and then, in advance, via the end portion of the screw side 10a of the bolt 10 and the insertion hole 25 of the fastening body 20. A nut 26 mounted inside the insertion hole 25 is screwed to tighten the bolt 10 (see FIG. 4A). Further, as the bolt 10 is tightened, the tip of the protrusion 22 is pressed into the center of the end face of the slit portion 11 provided at the end of the bolt 10 on the screwing side 10a (Fig. 4). See (b)). Then, when the bolt 10 is further tightened, the tip of the protrusion 22 further digs into the slit portion 11 to widen the slit portion 11 (see FIG. 4C). In this way, by tightening the bolt 10, the protrusion 22 of the fastening body 20 is pressed into the slit portion 11 and bites into the slit portion 11, and by expanding the slit portion 11, once tightened, the fastening state does not change with time. That is, it is possible to completely prevent loosening of the fastening by the bolts.

It should be noted that the number of slits 11 provided at the end of the screwing side 10a of the bolt 10 described above is four in total in the above and below embodiments, but this is necessary. It goes without saying that the fastening body 20 may be increased or decreased in accordance with the shape, and the side view shape of the fastening body 20 may be an appropriate shape.

[0012]

[Effect of device]

 As described above, according to the present invention, when the bolt is screwed into the fastening body, the protrusion provided on the fastening body is provided with the slit portion provided at the screwing side end portion of the bolt. By press-contacting and expanding the slit portion, once tightened, the tightened state does not change with time, that is, loosening of the bolt tightening can be completely prevented.

[Brief description of drawings]

FIG. 1 is a perspective explanatory view showing a first embodiment of the present invention.

FIG. 2 is a perspective explanatory view showing a second embodiment of the present invention.

FIG. 3 is a perspective explanatory view showing a third embodiment of the present invention.

4 (a), (b) and (c) are partially cutaway front view explanatory views for explaining a fastening procedure based on the first embodiment shown in FIG.

5 (a) (b) (c) are perspective explanatory views showing a conventional example, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 bolt 11 slit part 20 fastening body 21 screwing part 22 protrusion 23, 24 side wall 25 insertion hole 26 bolt 27, 28 connecting part 29 fastening member

Claims (4)

[Scope of utility model registration request] 1. A bolt and a fastening body for screwing the bolt together, the bolt having a slit portion at an end portion on a screwing side, and the fastening body for engaging a screw portion for screwing the bolt. When,
It is composed of a protrusion provided at a position facing the screwing portion and is continuous. With the screwing of the bolt to the fastening body, the protrusion is pressed against the slit portion so that the slit portion is expanded. A fastening unit characterized by the above. 2. The fastening body is formed integrally with both side walls of the bolt, which are located in the screwing and fastening direction, facing each other with a space therebetween, and has an insertion hole for the bolt formed in the one side wall. , The protrusion is provided on the inner side of the other side wall toward the center of the insertion hole of the bolt, and further, the distance between the connecting portions connecting the two opposite sides of the both side walls to each other is set to the The fastening unit according to claim 1, wherein the interval is such that rotation can be prevented. 3. The fastening body is formed integrally with both side walls of the bolt, which are located in the screwing fastening direction, facing each other with a gap therebetween, and the one side wall is provided with an insertion hole for the bolt. The fastening unit according to claim 1, wherein a screw that can be screwed into the bolt is formed in the insertion hole, and the protrusion is provided inside the other side wall toward the center of the insertion hole of the bolt. 4. The fastening body is formed integrally with both side walls of the bolt, which are located in the screwing and fastening direction of the bolt, facing each other with a gap therebetween, and the one side wall is provided with an insertion hole for the bolt. A nut to be fastened to the bolt is attached to the inside of the side wall so that its center coincides with the center of the insertion hole, and the protrusion is provided inside the other side wall toward the center of the insertion hole of the bolt. The fastening unit according to claim 1, wherein the fastening unit is a fastening unit.