JP3072663U - Device for preventing removal of fastening nut in fastening device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a nut from being intentionally loosened and easily retighten a fastened nut or replace a fastening bolt without damaging a cylindrical cover as necessary. A device for preventing a fastening nut from being removed in a fastening device that can be performed. SOLUTION: A tubular cover is provided for concealing a fastened nut and a lock nut, and the tubular cover is engaged with the lock nut via a pin or a hexagonal bolt attached to the tubular cover. Further, the tip of the pin or the hexagon socket head bolt is housed in a guide groove provided in the lock nut, so that the tubular cover can be easily removed.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a device for preventing a fastening nut from being removed in a fastening device.

[0002]

[Prior art]

 As a device for preventing removal of a fastening nut in a conventional fastening device, for example, a device described in Japanese Patent Publication No. 11-280746 is known. This is shown in FIG. As shown in the figure, in this conventional device, nuts 14 and 15 are fastened to fastening bolts 7 through which plates 21 and 22 are inserted. The fastening bolt 7 is, for example, a foundation bolt for fixing a pedestal of an article such as a steel tower or a water storage tank to a concrete structure. Reference numeral 20 denotes a jacket (cylindrical cover) having a thick portion 20a at a height substantially equal to the height of the nut 14 and a thin portion 20b at an upper portion thereof. Forcibly fit on the outer circumference. That is, the nut 14 is forcibly inserted from above so that the lower corner of the nut 14 bites into the thick portion 20a. A thin portion 20 b is formed around the upper nut 15, and a gap is provided between the nut 15 and the cylindrical cover 20. Therefore, even if the nuts 14 and 15 are to be rotated directly, this cannot be performed because the cylindrical cover 2 surrounds the nuts 14 and 15.

[0003]

[Problems to be solved by the invention]

 However, in such a fastening device, when the fastening bolt 7 is elongated due to aging or the like, it is necessary to retighten the nuts 14 and 15. If the fastening bolt 7 is damaged for some reason, it is necessary to replace the fastening bolt 7. However, in the device for preventing the removal of the fastening nut in the conventional fastening device, the cylindrical cover 2 is forcibly fitted to the nuts 14 and 15. No consideration was given to retightening the bolts 14 and 15 or replacing the fastening bolts 7. Therefore, even when the tubular cover 20 is to be removed, it is difficult to remove the tubular cover 20 without damaging it because the corners of the nut 14 bite into the tubular cover 20. It was difficult to retighten the nuts 14 and 15 and replace the fastening bolts 7.

The present invention has been made by focusing on the problems existing in such conventional technology. The purpose is to prevent the tightened nut from being intentionally loosened and to be easily removed as necessary without damaging the tubular cover. It is an object of the present invention to provide a fastening nut removal prevention device in a fastening device that enables easy replacement of a fastening bolt.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a fastening bolt, a fastening nut fastened to the fastening bolt, a main body, and an enlarged portion having a larger diameter than the main body. A lock nut for stopping the lock nut, a cylindrical cover for concealing the fastening nut and the lock nut, a lock pin driven from a hole provided in a cylindrical wall of the cylindrical cover, and a housing for accommodating the lock pin. A guide groove provided in the main body, wherein the lock pin abuts on an enlarged portion of the lock nut to prevent removal of the tubular cover, and the lock pin is housed in the guide groove. When it is in the position, the tubular cover can be removed.

Further, the present invention provides a lock nut for stopping a loosening of the fastening nut, comprising a fastening bolt, a fastening nut fastened to the fastening bolt, a main body portion and an enlarged portion having a larger diameter than the main body portion. And a cylindrical cover for concealing the fastening nut and the lock nut, and screwed into a screw hole provided in a cylindrical wall of the cylindrical cover, and a screw is formed by caulking an inlet of the screw hole. A hexagon socket head cap screw that is attached so that it cannot be loosened and removed outside of the cylindrical cover, and a guide groove provided in the main body so as to be able to store the hexagon socket head cap screw, When the side portion of the hexagonal bolt is in contact with the enlarged portion of the lock nut to prevent removal of the cylindrical cover, and when the hexagonal bolt is housed in the guide groove, the cylinder The cover may be removable.

Therefore, the present invention is configured as described above, so that the fastening nut removal preventing device in the fastening device can prevent the act of intentionally loosening the fastened nut by the cylindrical cover. . If it becomes necessary to remove the tubular cover, the tubular cover can be removed by storing the tip of the lock pin or hexagon socket head bolt in the guide groove provided in the lock nut. In this way, the tubular cover can be easily removed without damaging it, and the nuts can be easily tightened and the fastening bolts can be easily replaced.

[0008]

[Embodiment of the invention]

 Embodiment 1 FIG. A first embodiment of the present invention will be described below with reference to FIGS. In the first embodiment, the fastening bolt is a foundation bolt for a building or the like. As shown in FIG. 1, a base bolt 7 is attached to fasten the base component 5, and nuts 14 and 15 are fastened to the base bolt 7. Further, a lock nut 4 is fastened to the base bolt 7 to prevent the nuts 14 and 15 from loosening. Further, the cylindrical cover 2 is covered so as to cover the nuts 14 and 15 and the lock nut 4. A lock pin 1 is fitted into the cylindrical wall of the cylindrical cover 2, and a pin hole 3 for attaching the lock pin 1 to the cylindrical cover 2 is formed in a radial direction (toward the axis of the foundation bolt 7). ) Is provided. The lock pin 1 is driven into the pin hole 3, and the tip of the lock pin 1 contacts the side surface of the main body 4 a of the lock nut 4.

On the other hand, the lock nut 4 is composed of a main body 4a having a circular outer periphery and an enlarged part 4b formed by enlarging the tip side of the base bolt 7 in the main body 4a to form a hexagonal nut. It is configured. The lock nut 4 is provided radially (on the axis of the foundation bolt) on the side surface of the main body 4a between the side surface of the main body 4a and the enlarged portion 4b with which the tip of the lock pin 1 contacts. A guide groove 9 is provided which is formed as a round hole that faces. The guide groove 9 is for moving the lock pin 1 fitted and attached to the cylindrical cover 2 to the radial center side so that the lock pin 1 can be removed from the cylindrical cover 2. In addition, the depth is set to be at least the thickness of the cylindrical wall of the cylindrical cover 2 or more.

In assembling the above-mentioned fastening device, first, nuts 14, 15 and the lock nut 4 are fastened to the base bolt 7 for fastening the base component 5, and the nuts 14, 15 and the lock nut 4 are concealed. Then, the lock pin 1 is inserted from the pin hole 3 toward the shaft center of the base bolt 7 by inserting the lock pin 1 into the axial direction of the base bolt 7, and the tip of the lock pin 1 is attached to the side surface of the main body 4 a of the lock nut 4. The lock pin 1 is attached to the cylindrical cover 2 by making contact with the cylindrical cover 2, whereby the fastening device is assembled (see FIG. 1).

Since the fastening device of the present invention is configured as described above, after assembling, an unrelated person tries to remove the tubular cover 2 in order to intentionally loosen the fastened nut. Even when the cover 2 is lifted up, the side of the lock pin 1 abuts against the lower surface of the enlarged portion 4b of the lock nut 4, so that the tubular cover 2 cannot be removed. Therefore, an unrelated person cannot usually remove the tubular cover 2 and cannot loosen the fastened nuts 14 and 15.

On the other hand, a person (for example, an administrator, etc.) of the device for preventing the removal of the fastening nut in this fastening device knows this fastening mechanism, and thus retightens the nuts 14 and 15 and tightens the bolt 7. When it becomes necessary to remove the tubular cover 2 for replacement, the tubular cover 2 can be easily removed as follows. First, the cylindrical cover 2 is slightly lifted or rotated so that the tip of the lock pin 1 coincides with the guide groove (round hole) 9 (see FIG. 2). At this position, the lock pin 1 is driven from the outside of the cylindrical cover 2 toward the axis of the foundation bolt 7, and the tip of the lock pin 1 is housed in the guide groove 9. By performing such operations, the cylindrical cover 2 can be freely removed. In the first embodiment, since the cylindrical cover 2 can be easily removed without damaging it, the tightened nuts 14 and 15 can be re-tightened, and the base bolt 7 as a fastening bolt can be removed. Can be easily replaced.

Embodiment 2 Next, a second embodiment will be described with reference to FIG. In the second embodiment, a hexagon socket head bolt 12 is used instead of the lock pin 1 in the first embodiment, and a screw hole 11 is provided in the cylindrical cover 2 instead of the pin hole 3. The length of the hexagon socket head bolt 12 is set to such a value that it does not protrude outside the screw hole 11 in the mounted state. Then, in order to prevent the hexagon socket head bolt 12 screwed into the screw hole 11 from coming out, the hexagon socket head bolt 12 is screwed into the screw hole 11, and then the inlet of the screw hole 11 is swaged to fix the hexagon socket head. Bolt 12 is locked. In addition, the cylindrical cover 2 is provided with a viewing hole 10 for observing the tightened state of the nuts 14 and 15 and the like. Other configurations are the same as those of the first embodiment, and the same components are denoted by the same reference numerals, and description thereof will be omitted or simplified.

In assembling the above-mentioned fastening device, first, nuts 14 and 15 and a lock nut 4 are fastened to a base bolt 7 for fastening the base constituent member 5, and the nuts 14 and 15 and the lock nut 4 are concealed. Then, the hexagon socket head cap screw 12 is screwed from the screw hole 11 of the cylindrical cover 2 toward the axis of the base bolt 7, and the tip of the cap 12 is attached to the body of the lock nut 4. 4a. Therefore, similarly to the first embodiment, the non-related person cannot usually remove the cylindrical cover 2 and cannot intentionally loosen the fastened nuts 14 and 15.

On the other hand, a person concerned determines that the nuts 14 and 15 need to be retightened by observing the state of tightening of the nuts 14 and 15 from the peephole 10, If it is determined that replacement is necessary and the tubular cover 2 needs to be removed, the tubular cover 2 can be easily removed as follows. First, the cylindrical cover 2 is slightly lifted or rotated at a position where the end of the hexagon socket head bolt 12 matches the guide groove (round hole) 9. At this position, the hexagon socket head bolt 12 is screwed in, and the tip end is housed in the guide groove 9. By operating in this manner, the cylindrical cover 2 can be easily removed without damaging it, and the tightened nuts 14 and 15 can be easily re-tightened, and the replacement of the base bolt 7 as a fastening bolt can be easily performed. It can be carried out.

[0016]

[Effect of the invention]

 As described above, according to the present invention, an unrelated person cannot usually remove the tubular cover, and thus cannot intentionally loosen or remove the fastened nut. On the other hand, the stakeholders can easily attach and detach the cylindrical cover as necessary without damaging the cylindrical cover, and easily retighten the fastening nuts and replace the foundation bolts. be able to.

[Brief description of the drawings]

FIG. 1 is an overall side view showing a fastening nut removal prevention device according to a first embodiment of the present invention in a partial cross section.

FIG. 2 is a view for explaining an operation of removing a tubular cover according to the apparatus of FIG. 1;

FIG. 3 is an overall side view showing a partly sectional view of a fastening nut removal prevention device according to a second embodiment of the present invention.

FIG. 4 is an overall side view showing a conventional fastening nut removal preventing device in a partial cross section.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lock pin, 2 cylindrical cover, 3 pin holes, 4 lock nuts, 4a main body part, 4b enlarged part, 5 basic structural members, 7 basic bolts, 9 guide grooves (formed as round holes), 10 peep holes, 11 screw holes, 12 hexagon socket head bolts, 14, 15 nuts (for fastening).

Claims (2)

[Utility model registration claims] 1. A lock nut, comprising: a fastening bolt; a fastening nut fastened to the fastening bolt; a main body portion and an enlarged portion having a larger diameter than the main body portion; A cylindrical cover for concealing the lock nut, a lock pin driven from a hole provided in a cylindrical wall of the cylindrical cover, and a guide groove provided in the main body portion to accommodate the lock pin. The lock pin is in contact with an enlarged portion of the lock nut to prevent removal of the tubular cover, and when the lock pin is housed in the guide groove, the tubular cover can be removed. A device for preventing removal of a fastening nut in a fastening device. 2. A lock nut comprising a fastening bolt, a fastening nut fastened to the fastening bolt, a main body, and an enlarged portion having a diameter larger than that of the main body. A cylindrical cover for concealing the lock nut; screwed into a screw hole provided in a cylindrical wall of the cylindrical cover; A hexagon socket head cap screw attached so as not to be detached outside, and a guide groove provided in the main body so as to be able to store the hexagon socket head bolt, wherein a side portion of the hexagon socket head bolt is provided. The tubular cover is prevented from being removed by contacting the enlarged portion of the lock nut, and when the hexagonal socket head cap screw is housed in the guide groove, the tubular cover is removed. A device for preventing removal of a fastening nut in a fastening device, characterized in that: