JPH11294433A - Protection structure of nut for fastening and protection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent arbitrary removable of a fastening structure consisting of a bolt and a nut. SOLUTION: A fastening structure consists of a bolt 3 and a plurality of nuts 1 and 2 and comprises a lock member 10 fixed in a state to protrude from the outer surface of the nut 1; a protection member 11 to contain the nut 1 in a state to be loosely fitted in the nut 1 and the lock member 10; and an engaging part 13 formed integrally with or fixed at the protection member 11 and the lock member 10 and making it difficult that the protection member 10 is removed through engagement with the lock member 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection structure and a protection method for a fastening nut fixed by a plurality of nuts and bolts, and more particularly, to a method for preventing a nut from being arbitrarily removed from a frame structure such as a steel tower. To a protection structure and a protection method.

[0002]

2. Description of the Related Art Conventionally, in a frame structure such as a steel tower, a nut is fixed with a resin, or a plurality of nuts are used (so-called double nuts) in order to prevent a nut from being loosened at a fastening portion. Fixed. However, since the fastening structure including the bolt and the nut is a screw-in structure, the fastening structure can be easily removed by using a spanner, a wrench, or the like. Even if double nuts are used to prevent loosening, arbitrarily removing these nuts can cause even large structures such as towers to collapse. This causes enormous damage and great social impact.

[0003]

As a security measure taking into account the arbitrary removal of the nut, the nut is fixed with resin so that the nut is hardened to turn. It is conceivable to cover the nut with a circular cap to make it difficult to turn with a normal spanner or wrench.

[0004] However, the former method of fixing with resin is poor in workability and expensive. On the other hand, the latter method using a circular cap can be removed by using a strong pipe wrench, and it is not possible to completely prevent arbitrary removal.

Accordingly, an object of the present invention is to provide a nut protection structure and a protection method that make it difficult to remove these nuts arbitrarily. In addition, an object of the present invention is to prevent an arbitrary removal of a fastening structure including the bolt and the nut.

[0006]

According to a first aspect of the present invention, there is provided a fastening structure comprising a bolt and a nut, the locking member protruding from an outer surface of the nut and being fixed. A protection member for accommodating the nut in a state of being loosely fitted to the nut and the locking member, and being integrated or fixed to the protection member, making it difficult to remove the protection member by engagement with the locking member; And an engaging portion for protecting the tightening nut.

According to a second aspect of the present invention, the engaging portion is a projection protruding from an inner wall of the protection member toward a radial center, and the projection is disposed inside the locking member. The protection structure according to claim 1, wherein

According to a third aspect of the present invention, there is provided the protection structure for a tightening nut according to the first aspect, wherein the nut comprises an inner nut and a lock nut disposed outside the inner nut.

According to a fourth aspect of the present invention, the locking member is press-fitted into the inner nut.
2 is a protective structure for a tightening nut according to (1).

The invention according to claim 5 is the protection structure according to claim 3, wherein the locking member is press-fitted into both the inner nut and the lock nut.

The invention according to claim 6 is the protection structure according to any one of claims 1 to 5, wherein the protection member is a cylinder.

According to a seventh aspect of the present invention, there is provided the protective structure according to the sixth aspect, wherein the cylinder has an open end that can be closed.

The invention according to claim 8 is a fastening structure comprising a bolt and a nut, wherein the locking member comprises a hollow body having an inner diameter smaller than a diagonal dimension of the nut, and an outer diameter of the locking member. A protection member which is formed of a hollow body having a larger inner diameter than the outer diameter of the locking member and has a projection larger than a diagonal dimension of the nut provided in a radial center direction, 2. The protection structure according to claim 1, wherein the locking member is press-fitted into the nut from an open end of the protection member after disposing the protection member at a position where the nut is stored. It is a protection method of the nut for use.

[0014]

According to the first aspect of the present invention, since the nut is housed by the protection member, the nut cannot be directly removed with a wrench or the like. Further, since the protective member is loosely fitted to the nut, even if the protective member is rotated by a wrench or the like, the rotational force is not transmitted to the nut, so that the nut is not loosened. Further, the engaging portion fixed to the nut makes it difficult to remove the protective member by engaging with a locking member integrated or fixed to the protective member. In addition, since the engaging portion is housed in the protective member, it cannot directly contact the engaging portion from the outside. As a result, it becomes more difficult to remove the protective member.

This eliminates the desire to easily remove the nut, and prevents the nut from being arbitrarily removed from the fastening structure, which is effective in crime prevention.

According to the second aspect of the present invention, it is difficult to remove the protection member due to interference between the projection as the engagement portion and the locking member.

According to the protection structure of the third aspect, since the structure is tightened by a plurality of nuts, that is, tightened by a so-called double nut, natural loosening of the nut can be prevented and arbitrary removal of the nut can be performed. Can be prevented.

According to the protection structure of the fourth aspect, since the fixing of the locking member can be performed by press-fitting, it is extremely easy and operability is improved. Further, since the locking member is fixed to the inner nut, even if the locking member is rotated by friction between the locking member and the protection member, the locking member does not rotate due to the effect of the double nut.

According to the protection structure of the fifth aspect, since the fixing of the locking member can be performed by press-fitting, it is extremely easy and operability is improved. Further, since the locking member is fixedly fixed to the plurality of nuts, it is firmly fixed and it is difficult to remove the protection member.

According to the protection structure of the sixth aspect, since the outer shape of the protection member is circular, it is difficult to bite a wrench or a wrench.

According to the protection structure of the seventh aspect, since the opening end of the protection member can be closed, the appearance is beautiful. In addition, an effect of preventing dirt and corrosion of the fastening structure is expected.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings using a hexagonal nut, but the present invention is similarly applied to other polygonal nuts such as a quad nut.

FIGS. 1 to 7 are views for explaining a protection structure for a tightening nut according to an embodiment of the present invention.

FIG. 1 shows an example to which the present invention is applied, in which two nuts 1 and 2 and one bolt 3 of the same size are used.
Shows a fixing structure 6 in which steel members 4 and 5 as members to be fastened are fastened. Two steel members 4, 5
In the through hole 7, a bolt 3 penetrates from one side 5a side, and a screw portion 8 protrudes to the other side 4a side. Two nuts 1 and 2 are screwed into the screw portion 8 via a washer 9, so that a so-called double nut is fixed by the two nuts 1 and 2.

The nuts 1 and 2 and the bolt 3 conform to, for example, JIS standards. The dimensions of each part of the nut (nut height H, width across flats B, diagonal dimension C) are shown in FIG.
, And in the following description, reference numerals 1 and 2 indicating nuts for respective dimensions are given as subscripts to these dimensions. The nut height H1 of this nut 1 is 1
8 mm, width (two-plane width) B between the opposing surfaces 1a and 1a
1 is 35 mm, and the width (diagonal dimension) C1 between the opposing vertices 1b and 1b is 40.4 mm. In this embodiment, nuts 1 and 2 have the same standard.

Here, the double nut fixing means the nut 1
Is screwed, and then the nut 2 is screwed and fixed, and the nut 1 and the nut 2 are urged in opposite directions (x and y directions in the figure). Thereby, the nut 1
Are pressed against the thread 8a above the bolt 3, and the thread of the nut 2 is pressed against the thread 8b below the bolt 3. This prevents the nuts 1 and 2 from rotating and loosening.

However, the nuts 1 and 2 are both exposed, and can be removed by removing the nuts 1 and 2 by sandwiching the respective surfaces 1a and 2a with a wrench or the like.

FIG. 3 is a view for explaining an inner sleeve 10 as a locking member used in the present invention. The inner sleeve 10 has a circular pipe shape. The inner sleeve 10 is formed of a material which is softer than the steel bars forming the nuts 1 and 2, for example, is formed by processing an aluminum alloy pipe or the like. It may be formed from other materials such as iron and resin. Aluminum alloys used for electric wires (ACSR), clamps, and the like have good bite and good workability.

Since the inner sleeve 10 is a locking member press-fitted and fixed to the nut 1, for example, its outer diameter D10 is about 46 mm. The inner diameter d10 is 40.3 mm, the thickness is about 2.5 mm, and the height H10 is about 10 mm.

FIG. 4 is a view for explaining a protective sleeve 11 as a protective member used in the present invention. The protective sleeve 11 has a lower end 11a and an upper end 11b which are open.
Inside it is a cylindrical hollow body having a space 12. The protective sleeve 11 is made of a material that is not easily deformed, and is, for example, an aluminum pipe.
It may be formed from other materials such as iron and resin,
The same material as the inner sleeve 10 may be used.

Since the protective sleeve 11 is loosely fitted to the nuts 1 and 2 and the inner sleeve 10, its inner diameter d
11 is 48m larger than the outer diameter D10 of the inner sleeve
m. Further, it is made sufficiently thick so as not to be easily deformed, for example, its outer diameter D11 is 56 mm. The height H11 of the protective sleeve 11 is about 6
0 mm, so that the nuts 1 and 2 and the bolt 3 can be stored in the space 12.

The protection sleeve inner wall 11c is provided with a projection 13 over the entire circumference. Since the protrusion 13 is difficult to remove by engagement with the inner sleeve 13 and the protective sleeve 11 is loosely fitted to the nut, the inner diameter d13 of the protrusion tip is about 43 mm, which is smaller than the inner sleeve outer diameter D11. And it is larger than the diagonal dimension C1 of the nut 1. In addition, this projection 13 is
A height H13 from a is provided at a position of about 6.5 mm, and this section is a skirt portion 14 for accommodating the washer 9 and the like.

As shown in FIG. 5, the protective sleeve 1 is opened with its open end 11a facing the fixing structure 6.
1 is mounted, and the nuts 1 and 2 are stored in the space 12. Next, the inner sleeve opening end 10a faces the fixing structure 6 and is inserted into the space 12. Since the inner diameter d10 is smaller than the diagonal dimension C2, the inner sleeve inner wall 10c abuts on the apex 2b and refuses fitting. However, when the inner sleeve 10 is forcibly pressed, the inner wall 10c is deformed by the apex 2b.

For the press-fitting, for example, an annular attachment 15 formed of a hard steel material as shown in FIG. 6 may be used. The attachment 15 has an outer diameter D15 of 47 mm smaller than the inner diameter d11 of the protective sleeve, and an inner diameter d15 of 42 mm larger than the diagonal dimensions C1 and c2 of the nut.
The inner sleeve 10 can be press-fitted by hitting the inner sleeve 10 with a sound deadening hammer or the like using the attachment 15, and the lower end 10a of the inner sleeve 10 is press-fitted until it comes close to the protrusion 13. At this time, the protective sleeve lower end 1
1a is in contact with the surface 4a to prevent the protective sleeve 11 from being pulled out by a driver or the like.

As a result, as shown in FIG. 7, a protection structure 16 of the present invention is obtained. In the protection structure 16, the two nuts 1 and 2 fixed to the double nut are housed in the hollow 12 of the protection sleeve 11, so that a wrench or the like cannot directly act on the nuts 1 and 2 from the outside. .

Further, the inner wall 11c of the protective sleeve has a gap formed with the vertices 1b and 2b corresponding to the outermost diameters of the nuts 1 and 2. Further, as shown in FIG. 8, a gap is formed between the inner wall 11c of the protective sleeve and the outer wall of the inner sleeve 10. Further, a gap is formed between the projection inner wall 13a of the protective sleeve 11 and the vertex 1b of the nut 1, as shown in FIG. As a result, the protective sleeve 11 is freely and rotatably loosely fitted with the nuts 1 and 2 and the inner sleeve 10 pressed therein.

On the other hand, the inner sleeve 10 is fixed to the nut 1 with the nut apex 1b biting into the inner wall 10a. The lower end 10 a of the inner sleeve 10 interferes with the projection 13. Thereby, the protective sleeve 11
Is not withdrawn, but because this bite is enough,
It is also difficult to intentionally detach the protective sleeve 11. Further, the nut does not loosen naturally due to the effect of the double nut.

Further, even if the inner sleeve is rotated by friction by forcibly contacting the locking member and the inner sleeve, the nut 2 does not rotate even if the nut 1 tries to rotate due to the effect of the double nut. There is no. Thus, it is difficult to easily remove the nuts 1 and 2 and the desire to remove the nuts 1 and 2 is lost. If it is forcible, arbitrary removal of the nut can be prevented, which is effective in crime prevention.

In this embodiment, an example has been shown in which the position of the vertex 1a and the position of the vertex 2a match.
Even if this position is displaced, only the deformation trajectory by the vertex 2b is formed on the inner wall 10a, and the other operation and effects are exactly the same.

According to FIG. 8, the sleeve 10 keeps a clean cylindrical shape, but it is not always necessary to have a clean cylindrical shape, and the sleeve 10 may be deformed before being pressed or in a pressed state. .

Hereinafter, a modified example of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. The same or equivalent parts as those of the embodiment will be described with the same reference numerals.

[0042]

[Modification 1] In the embodiment, the mode in which the fixing structure 6 fastened by the double nut is directly used is shown.
The present invention is also applicable to a fastening structure 6 'directly fixed by a single nut 1 in which a washer 9 is not used, as shown in FIG.

For example, in the first modification, the nut height H
1 are fastened by a single nut 1 of 18 mm. Prior to mounting the protective sleeve 11, as shown by a two-dot chain line in FIG.
The same nut 2 as used in the embodiment m is screwed in as a locking nut. This results in a double nut fastening structure. At this time, the height H2 of the nut 2 may be equal to H1, but particularly in the double nut structure, H2 is sufficiently effective even if it is lower than H1. Lock nuts, idling, washer nuts, cap nuts, suspension nuts, round nuts, etc. may be used, but preferably, the protective sleeve 11 is used.
After installing the lock nut 2 and the protective sleeve inner wall 11
It is preferable that the distance between the lock nut 2 and c is narrow and it is difficult to remove the lock nut 2. Further, when the nut 2 having a small play, that is, a so-called high screw precision is selected as the nut 2, the fixing effect by the double nut becomes remarkable, so that it is good.

Thereafter, the protective structure is obtained by press-fitting the inner sleeve 10 after mounting the protective sleeve 11 in exactly the same manner as in the embodiment. Other configurations and operations are substantially the same as those of the embodiment, and therefore, description thereof is omitted.

[0045]

[Modification 2] A protective sleeve 11 'shown in FIG. 11 can be used as the protective sleeve. This protective sleeve 1
1 ′, a projection 13 having a height H13 substantially equal to the height of the nut 1 is provided. A cut 13b for accommodating the washer 9 is cut near the lower end 11a of the projection 13.

When the protective sleeve 11 'is mounted on the fastening structure stopped by the single nut 1, the washer 9' is fitted, and the nut 2 is mounted with a special wrench, the fastening structure shown in FIG. 12 is obtained. Even with the configuration as shown in FIG. 12, by selecting the size of the washer 9 ′ so as to interfere with the protrusion 13, substantially the same effect as in the embodiment can be obtained.

[0047]

[Modification 3] In the embodiment, a protective sleeve 11 'having a height H13 substantially equal to the height of the nut 1 shown in FIG.
When assembling the protective structure 16 in the same manner except for using, the structure shown in FIG. 13 is obtained.

In this figure, although the protective sleeve 11 'is loosely fitted, the protective sleeve 11' does not come off due to interference between the inner sleeve 10 pressed into the nut 2 and the projection 13. The other configuration, operation, and effect are the same as those of the embodiment, and a detailed description thereof will be omitted.

[0049]

[Modification 4] In Modification 4, a slight step 14b is provided near the upper end 11b of the protective sleeve 11, and the step 17b has a periphery 17a around a disk-shaped aluminum cap 17.
Is pressed and pressed. Thereby, the upper end 11b
Is closed, so the appearance is beautiful. Further, an effect of preventing the fastening structure 6 from being stained and corroded is also expected.

In the aluminum cap 17, the periphery 17a and the step 14b may be fixed by an adhesive, or both may be cut off and fixed by screwing.

[0051]

[Modification 5] When the opening end 11b faces upward in the vertical direction,
When the lower end 11a is in good contact with the washer 9 or the fastening member 4a, rainwater may stay in the protective sleeve 11. In such a place, the protective sleeve 11 is
A cut 13e leading to the outside may be provided near 1a as shown in FIG. Even if rainwater enters inside, the rainwater is discharged from the cut 13e. In this figure, the number of cuts is two, but the number of cuts is not limited. For example, four cuts may be provided evenly over the entire circumference, or may be provided indefinitely in some cases.

[0052]

[Modification 6] In the embodiment, the inner sleeve 10 whose height H13 is higher than the height of the nut 1 may be used. As shown in FIG. 16, the locking member includes a plurality of nuts 1,
2, it is difficult to remove the protection member firmly. The other configuration, operation, and effect are the same as those of the embodiment, and a detailed description thereof will be omitted.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. Included in the invention. For example, in the embodiment, detailed dimensions of each member are shown, but the dimensions are not limited within the scope of the present invention.

In the embodiment, the protective sleeve 11 having a substantially cylindrical outer shape is used.
The conical shape makes it more difficult to bite a wrench or the like.

[0055]

As described above, according to the present invention, there is provided a nut protection structure and a protection method which make it difficult to arbitrarily remove a nut. As a result, it is possible to prevent arbitrary removal of the fastening structure including the bolt and the nut.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a fixing structure using a double nut.

FIG. 2 is a view for explaining dimensions of a nut, and FIG.
Is a side view, and FIG. 2B is a plan view.

FIG. 3 is a sectional view illustrating an inner sleeve used in the embodiment of the present invention.

FIGS. 4A and 4B are diagrams illustrating a protection member used in the embodiment of the present invention, wherein FIG. 4A is a sectional view and FIG. 4B is a plan view.

FIG. 5 is an assembly view showing a state of forming a protection structure according to the embodiment.

FIG. 6 is a sectional view showing an attachment used in the embodiment.

FIG. 7 is a cross-sectional view showing a protection structure according to the embodiment.

FIG. 8 is an end view taken along line AA of the protection structure of FIG. 7;

9 is an end view of the protection structure of FIG. 7 taken along line BB.

FIG. 10 is a cross-sectional view illustrating a protection structure according to a first modification.

FIG. 11 is a sectional view showing a protective sleeve used in Modifications 2 and 3.

FIG. 12 is a cross-sectional view illustrating a protection structure according to a second modification.

FIG. 13 is a cross-sectional view illustrating a protection structure according to a third modification.

FIG. 14 is a partial cross-sectional view of a protective sleeve used in a fourth modification.

FIG. 15 is a perspective view showing a protective sleeve of Modification Example 5.

FIG. 16 is a cross-sectional view illustrating a protection structure according to a sixth modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner nut 2 Outer nut 3 Bolt 10 Locking member (inner sleeve) 11 Protective member (protective sleeve) 13 Engaging part (projection) 13a Engaging part (projection) inner wall 14 Free fitting part 14a Inner wall of free fitting part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Endo 2109-8 Yashima Nishimachi, Takamatsu City, Kagawa Prefecture Inside Techno Success Co., Ltd. (72) Inventor Kazuhide 2109-8 Yashima Nishimachi, Takamatsu City, Kagawa Prefecture Techno Sa Inside of Success Co., Ltd. (72) Inventor Masaaki Sudo 2109-8 Yajima Nishimachi, Takamatsu City, Kagawa Prefecture Inside Techno Success Co., Ltd.

Claims (8)

[Claims] 1. A fastening structure including a bolt and a nut, wherein a locking member protruding from an outer surface of the nut is fixed, and the nut is housed in a state of being loosely fitted to the nut and the locking member. A tightening nut, comprising: a protective member; and an engaging portion that is integrated or fixed to the protective member and makes it difficult to remove the protective member by engaging with the locking member. Protection structure. 2. The projection according to claim 1, wherein the engagement portion is a projection protruding from an inner wall of the protection member toward a radial center, and the projection is disposed inside the locking member. 2. The protective structure according to 1. 3. The tightening nut protection structure according to claim 1, wherein the nut comprises an inner nut and a lock nut disposed outside the inner nut. 4. The structure according to claim 3, wherein the locking member is press-fitted into the inner nut. 5. The protection structure according to claim 3, wherein the locking member is press-fitted into both the inner nut and the lock nut. 6. The protection structure according to claim 1, wherein the protection member is a cylinder. 7. The protection structure according to claim 6, wherein the cylinder has an open end that can be closed. 8. A fastening structure comprising a bolt and a nut, wherein the locking member comprises a hollow body having an inner diameter smaller than a diagonal dimension of the nut, and a locking member having an inner diameter smaller than an outer diameter of the locking member. The nut is housed by using a protection member that is formed of a large hollow body, and has a projection smaller than the outer diameter of the locking member and larger than the diagonal dimension of the nut in the radial center direction. 2. The method for protecting a tightening nut according to claim 1, wherein, after disposing the protection member at a position, the locking structure is press-fitted into the nut from an open end of the protection member to form the protection structure according to claim 1. .