JP3792044B2 - Tightening nut protection structure and protection method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a protection structure and a protection method for a tightening nut fixed by a plurality of nuts and bolts, and more particularly, a protection structure and protection for preventing arbitrary removal of a nut of a frame structure such as a steel tower. Regarding the method.
[0002]
[Prior art]
Conventionally, frame structures such as steel towers are fixed by fixing the nut with a resin or by fastening with a plurality of nuts (so-called double nuts) in order to prevent the nut of the fastening portion from loosening. . However, since the fastening structure composed of the bolt and the nut is a screw-in structure, the fastening structure can be easily removed by using a spanner or a wrench. Even if loosening is prevented by the double nut, if these nuts are removed arbitrarily, even large structures such as steel towers sometimes collapse. As a result, a great deal of damage is caused and the social impact is great.
[0003]
[Problems to be solved by the invention]
As a security measure in consideration of arbitrary removal of the nut, fix the nut with resin and harden it to prevent it from turning. It is possible 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 when a strong pipe wrench is used, and arbitrary removal cannot be completely prevented.
[0005]
Therefore, an object of the present invention is to provide a nut protection structure and a protection method that make it difficult to remove these arbitrary nuts. In addition, an object of the present invention is to prevent arbitrary removal of the fastening structure composed of these bolts and nuts.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention of claim 1 of the present invention is a tightening structure using a bolt and a nut,
A cylindrical locking member fixed to the outer surface of the nut by press-fitting, a protection member for housing the nut in a loosely fitted state with the nut and the locking member, and an integral or fixed to the protection member A fastening nut protecting structure comprising: an engaging portion that makes it difficult to remove the protecting member by engaging with the locking member.
[0007]
The invention according to claim 2 is characterized in that the engaging portion is a protrusion protruding from the inner wall of the protection member toward the radial center, and the protrusion is disposed inside the locking member. The protective structure according to claim 1.
[0008]
According to a third aspect of the present invention, there is provided the nut tightening protection structure according to the first aspect, wherein the nut comprises an inner nut and a set nut arranged on the outer side of the inner nut.
[0009]
The invention according to claim 4 is the protective structure for a tightening nut according to claim 3, wherein the locking member is press-fitted into the inner nut.
[0010]
The invention according to claim 5 is the protective structure according to claim 3, wherein the locking member is press-fitted into both the inner nut and the retaining nut.
[0011]
A sixth aspect of the present invention is the protective structure according to any one of the first to fifth aspects, wherein the protective member is a cylinder.
[0012]
The invention according to claim 7 is the protective structure according to claim 6, wherein the cylinder is capable of closing an open end.
[0013]
The invention of claim 8 is a tightening structure using bolts and nuts, and includes a locking member made of a hollow body having an inner diameter smaller than the diagonal dimension of the nut, and an inner diameter larger than the outer diameter of the locking member. Using a protective member that is formed of a hollow body having a large size and that 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,
The fastening structure according to claim 1, wherein after the protective member is disposed at a position where the nut is accommodated, the locking member is press-fitted into the nut from an open end of the protective member. This is a method for protecting the nut.
[0014]
[Action]
According to the protection structure of the first aspect, since the nut is housed by the protection member, the nut cannot be removed directly with a wrench or the like. Further, since this protective member is loosely fitted to the nut, even if this protective member is rotated by a wrench or the like, this rotational force is not transmitted to the nut, so that the nut does not loosen.
Furthermore, since the cylindrical locking member is fixed to the outer surface of the nut by press-fitting, it is difficult to remove the protective member by engaging with an engaging portion integrated or fixed to the protective member. In addition, since these locking members and engaging portions are housed in the protective members, they cannot be brought into direct contact with the locking members and engaging portions from the outside. As a result, the protective members can be removed further. It becomes difficult.
[0015]
This eliminates the willingness to easily remove the nut, prevents arbitrary removal of the fastening structure, and is effective in crime prevention.
[0016]
If comprised like invention of Claim 2, it will be difficult to remove the protection member by interference with the protrusion as an engaging part, and a locking member.
[0017]
According to the protection structure of the third aspect, since the structure is tightened by a so-called double nut that is tightened by a plurality of nuts, natural loosening of the nut can be prevented and arbitrary nut removal can be prevented.
[0018]
According to the protection structure of the fourth aspect, since the locking member may be fixed by press fitting, it is extremely easy and the operability is good. In addition, since the locking member is fixed to the inner nut, even if it is attempted to rotate the locking member by friction between the locking member and the protective member, the locking member does not rotate due to the effect of the double nut.
[0019]
According to the protective structure of the fifth aspect, since the locking member may be fixed by press-fitting, it is extremely easy and the operability is good. Further, since the locking member is fixedly fixed to the plurality of nuts, it is difficult to remove the protective member because it is firmly fixed.
[0020]
According to the protective structure of the sixth aspect, since the outer shape of the protective member is circular, it is difficult to bite a spanner or a wrench.
[0021]
According to the protective structure of the seventh aspect, since the open end of the protective member can be closed, the appearance is beautiful. In addition, the effect of preventing the contamination and corrosion of the fastening structure is also expected.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings using hexagon nuts, but the present invention is similarly used in other polygonal nuts such as four-stroke nuts.
[0023]
FIGS. 1-7 is a figure explaining the protection structure of the nut for a fastening which concerns on embodiment of this invention.
[0024]
FIG. 1 shows an example to which the present invention is applied, and shows a fixing structure 6 in which steel members 4 and 5 as fastening members are fastened by two nuts 1 and 2 and one bolt 3 of the same size. ing. A through hole 7 is formed in the two steel members 4 and 5, and the bolt 3 penetrates from the one side 5 a side into the through hole 7, and a screw portion 8 projects to the other side 4 a side. Two nuts 1 and 2 are screwed into the threaded portion 8 via a washer 9, thereby fixing a so-called double nut by the two nuts 1 and 2.
[0025]
These 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 defined as shown in FIG. 2, and in the following description, reference numerals 1 and 2 indicating the nut for each dimension are shown. A description will be given with the dimensions added as a subscript. The nut height H1 of this nut 1 is 18 mm, the width (double width) B1 between the opposing faces 1a and 1a is 35 mm, and the width (diagonal dimension) C1 between the opposing vertices 1b and 1b is 40. 4 mm. In this embodiment, the nut 1 and the nut 2 are of the same standard.
[0026]
Here, the double nut fixing is a structure in which the nut 1 is screwed and then the nut 2 is screwed and fixed, and the nut 1 and the nut 2 are biased in opposite directions (x and y directions in the figure). Yes. Thereby, the screw thread of the nut 1 is pressed against the screw thread 8 a above the bolt 3, and the screw thread of the nut 2 is pressed against the screw thread 8 b below the bolt 3. This prevents the nuts 1 and 2 from rotating and loosening.
[0027]
However, the nuts 1 and 2 are both exposed, and can be removed by sandwiching and rotating the surfaces 1a and 2a of the nuts 1 and 2 with a wrench or the like.
[0028]
FIG. 3 is a view for explaining an inner sleeve 10 as a locking member used in the present invention, and the inner sleeve 10 has a circular pipe shape (cylindrical shape) . The inner sleeve 10 is made of a soft material, such as an aluminum alloy pipe, which is softer than the steel bars constituting the nuts 1 and 2. You may form from other materials, such as iron and resin. Wire (ACSR), aluminum alloy used like clamp, good bite, workability is good.
[0029]
Since the inner sleeve 10 is a locking member that is press-fitted and fixed to the nut 1, for example, the 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.
[0030]
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 opened, and a cylindrical hollow having a space 12 therein. There is a body. 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, and may be the same material as the inner sleeve 10.
[0031]
Since the protective sleeve 11 is loosely fitted to the nuts 1 and 2 and the inner sleeve 10, the inner diameter d11 is about 48 mm which is larger than the inner sleeve outer diameter D10. Further, it is sufficiently thick so as not to be easily deformed, and its outer diameter D11 is, for example, 56 mm. The height H11 of the protective sleeve 11 is about 60 mm, so that the nuts 1 and 2 and the bolt 3 can be stored in the space 12.
[0032]
The protective sleeve inner wall 11c is provided with a protrusion 13 over the entire circumference. Since this protrusion 13 is difficult to remove by engagement with the inner sleeve 13 and the protective sleeve 11 is loosely fitted with the nut, the inner diameter d13 of the tip of the protrusion 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. Further, the projection 13 is provided at a position where the height H13 is about 6.5 mm from the opening end 11a, and this section is a skirt portion 14 for storing the washer 9 and the like.
[0033]
As shown in FIG. 5, the opening end 11 a of the protective sleeve 11 faces the fixing structure 6, the protective sleeve 11 is attached, and the nuts 1 and 2 are stored in the space 12. Next, the inner sleeve opening end 10 a is inserted into the space 12 so as to face the fixing structure 6. Since the inner diameter d10 is smaller than the diagonal dimension C2, the inner sleeve inner wall 10c abuts against the apex 2b and refuses to be fitted, but the inner wall 10c is deformed by the apex 2b when the inner sleeve 10 is forcibly pressed.
[0034]
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 protective sleeve inner diameter d11, and an inner diameter d15 of 42 mm larger than the nut diagonal dimensions C1 and c2. The attachment 15 can be press-fitted by driving the inner sleeve 10 with a silencing hammer or the like, and the lower end 10 a of the inner sleeve 10 is press-fitted until it comes close to the protrusion 13. At this time, the lower end 11a of the protective sleeve is in contact with the surface 4a, and the protective sleeve 11 is prevented from being pulled out by a screwdriver or the like.
[0035]
As a result, as shown in FIG. 7, the protective structure 16 of the present invention is obtained. In this protective structure 16, the two nuts 1 and 2 fixed to the double nut are accommodated in the hollow 12 of the protective sleeve 11, so that a wrench or the like cannot be directly applied to the nuts 1 and 2 from the outside. .
[0036]
Further, the protective sleeve inner wall 11c is formed with a gap from the apexes 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 11 c of the protective sleeve and the outer wall of the inner sleeve 10. Further, as shown in FIG. 9, a gap is formed between the protrusion inner wall 13a of the protective sleeve 11 and the apex 1b of the nut 1. As a result, the protective sleeve 11 is loosely fitted so as to be freely rotatable with the nuts 1 and 2 and the inner sleeve 10 being press-fitted.
[0037]
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 protrusion 13. As a result, the protective sleeve 11 is not detached, but the biting is sufficient, so that it is difficult to intentionally remove the protective sleeve 11. Also, this nut does not loosen naturally due to the effect of the double nut.
[0038]
Further, even if the locking member and the inner sleeve are forcibly brought into contact with each other and the inner sleeve is rotated by friction, the nut 1 does not rotate even if the nut 1 tries to rotate due to the effect of the double nut, so that it does not loosen. Thereby, even if it is going to remove nuts 1 and 2 easily, it will be difficult and willingness to remove will be lost. If it is strong, it can prevent arbitrary removal of the nut, and is effective in crime prevention.
[0039]
In this embodiment, the example in which the position of the vertex 1a and the position of the vertex 2a are matched is shown. However, even if the position is shifted, only the deformation locus by the vertex 2b is formed on the inner wall 10a. Other functions and effects are exactly the same.
[0040]
Further, according to FIG. 8, the sleeve 10 maintains a clean cylindrical shape, but it does not necessarily have to be a clean cylindrical shape, and may be deformed before being press-fitted or in a press-fitted state.
[0041]
Hereinafter, modifications of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated about the same or equivalent part as embodiment.
[0042]
[Modification 1]
In the embodiment, the mode in which the fixing structure 6 fastened by the double nut is directly used is shown. However, as shown in FIG. 10, the fastening structure 6 ′ directly fixed by the single nut 1 in which the washer 9 is not used. The present invention is also applicable to.
[0043]
For example, in the first modification, the nut height H1 is fastened by a single nut 1 having a length of 18 mm. Prior to mounting the protective sleeve 11, as shown by a two-dot chain line in FIG. 10, the same nut 2 as used in the embodiment having a nut height H2 of 18 mm is screwed into the screw head 8 as a set nut. Thereby, it is set as 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, the effect is sufficiently exhibited even if H2 is lower than H1. Lock nuts, idling, washer nuts, cap nuts, suspension nuts, round nuts and the like may be used. Preferably, after the protective sleeve 11 is mounted, the interval between the lock nut 2 and the protective sleeve inner wall 11c is narrow, and the lock nut What is difficult to remove 2 is good. Further, if the nut 2 is selected so that there is little play and so-called high screw accuracy, the fixing effect by the double nut may be significant.
[0044]
Thereafter, the protective structure can be obtained by press-fitting the inner sleeve 10 after the protective sleeve 11 is mounted in the same manner as in the embodiment. Since other configurations and operations are substantially the same as those in the embodiment, description thereof is omitted.
[0045]
[Modification 2]
A protective sleeve 11 ′ shown in FIG. 11 can also be used as the protective sleeve. The protective sleeve 11 ′ is provided with a protrusion 13 having a height H13 substantially equal to the height of the nut 1. In the vicinity of the lower end 11 a of the protrusion 13, a cut 13 b that houses the washer 9 is cut.
[0046]
When this protective sleeve 11 'is attached to a fastening structure stopped by a single nut 1, and a washer 9' is fitted, and then the nut 2 is attached by a special wrench, the fastening structure shown in FIG. 12 is obtained. Even when configured as shown in FIG. 12, by selecting the size of the washer 9 ′ so as to interfere with the protrusions 13, substantially the same effect as in the embodiment can be obtained.
[0047]
[Modification 3]
In the embodiment, when the protective structure 16 is assembled in the same manner except that a protective sleeve 11 ′ having a height H13 substantially the same as the height of the nut 1 is used as shown in FIG.
[0048]
In this figure, the protective sleeve 11 ′ is loosely fitted, but the inner sleeve 10 press-fitted into the nut 2 interferes with the protrusion 13 so that the protective sleeve 11 ′ does not come off. Since other configurations and operational effects are the same as those of the embodiment, detailed description thereof is omitted.
[0049]
[Modification 4]
In this modified example 4, a slight step 14b is provided in the vicinity of the upper end 11b of the protective sleeve 11, and a periphery 17a of a disk-shaped aluminum cap 17 is brought into contact with and pressed into the step 14b. Thereby, since the upper end 11b is closed, the appearance is beautiful. Moreover, the effect which prevents the fastening structure 6 from being dirty and corroded is also expected.
[0050]
The aluminum cap 17 may be fixed by fixing the periphery 17a and the step 14b with an adhesive or by screwing both of them together.
[0051]
[Modification 5]
When the open end 11b faces upward in the vertical direction, rainwater may stay in the protective sleeve 11 when the lower end 11a and the washer 9 or the fastened body 4a are in close contact with each other. In such a place, the protective sleeve 11 may be provided with a notch 13e leading to the outside as shown in FIG. 15 in the vicinity of the lower end 11a. Even if rainwater enters inside, the rainwater is discharged from the cut 13e. In this figure, there are two cuts, but the number of cuts is not limited. For example, four cuts may be provided evenly on the entire circumference, or an infinite number may be provided in some cases.
[0052]
[Modification 6]
In the embodiment, the inner sleeve 10 having a height H13 higher than the height of the nut 1 may be used. As shown in FIG. 16, since the locking member is fixed to the plurality of nuts 1 and 2, it is firmly fixed and it is difficult to remove the protection member. Since other configurations and operational effects are the same as those of the embodiment, detailed description thereof is omitted.
[0053]
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and any design change or the like within a scope not departing from the gist of the present invention is included in the present invention. It is. For example, although the detailed dimensions of each member are shown in the embodiment, the dimensions are not limited within the scope of the present invention.
[0054]
In the embodiment, the protective sleeve 11 having a substantially cylindrical outer shape is used. However, it becomes more difficult to bite a wrench or the like by making the outer shape hemispherical or conical.
[0055]
【The invention's effect】
As described above, according to the present invention, a nut protection structure and a protection method that make it difficult to remove an arbitrary nut are provided. Thereby, arbitrary removal of the fastening structure consisting of these bolts and nuts can be prevented.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a fixing structure using a double nut.
FIGS. 2A and 2B are diagrams illustrating dimensions of a nut, FIG. 2A is a side view, and FIG. 2B is a plan view.
FIG. 3 is a cross-sectional view illustrating an inner sleeve used in the embodiment of the present invention.
4A and 4B are diagrams illustrating a protective member used in an embodiment of the present invention, in which FIG. 4A is a cross-sectional view and FIG. 4B is a plan view.
FIG. 5 is an assembly diagram illustrating how a protective structure according to an embodiment is formed.
FIG. 6 is a cross-sectional view showing an attachment used in the embodiment.
FIG. 7 is a cross-sectional view showing the protective structure of the embodiment.
FIG. 8 is an end view taken along line AA of the protective structure of FIG.
9 is an end view taken along line BB of the protective structure of FIG.
10 is a cross-sectional view showing a protective structure of Modification 1. FIG.
11 is a cross-sectional view showing a protective sleeve used in Modifications 2 and 3. FIG.
12 is a cross-sectional view showing a protective structure of Modification 2. FIG.
13 is a cross-sectional view showing a protective structure of Modification 3. FIG.
14 is a partial cross-sectional view of a protective sleeve used in Modification 4. FIG.
FIG. 15 is a perspective view showing a protective sleeve of Modification 5;
FIG. 16 is a cross-sectional view showing a protective structure of Modification 6;
[Explanation of symbols]
1 Inner nut 2 Outer nut 3 Bolt 10 Locking member (inner sleeve)
11 Protection member (protection sleeve)
13 Engagement part (protrusion)
13a Engagement part (projection) inner wall 14 Free fitting part 14a Inner wall of the loose fitting part

Claims (8)

It is a tightening structure with bolts and nuts,
A cylindrical locking member fixed to the outer surface of the nut by press fitting ;
A protective member that houses the nut in a loosely fitted state with the nut and the locking member;
An engagement portion that is integrated or fixed to the protection member and makes it difficult to remove the protection member by engagement with the locking member;
A tightening nut protection structure characterized by comprising: The engaging portion is a protrusion protruding from the inner wall of the protection member toward the radial center,
The protective structure according to claim 1, wherein the protrusion is disposed inside the locking member. The said nut is comprised from the inner nut and the stop nut arrange | positioned on the outer side, The protection structure of the nut for clamping of Claim 1 characterized by the above-mentioned. The protection structure for a tightening nut according to claim 3, wherein the locking member is press-fitted into the inner nut. The protection structure according to claim 3, wherein the locking member is press-fitted into both the inner nut and the locking nut. The protective structure according to claim 1, wherein the protective member is a cylinder. The protective structure according to claim 6, wherein the cylinder is capable of closing an open end. It is a tightening structure with bolts and nuts,
A locking member made of a hollow body having a smaller inner diameter than the diagonal dimension of the nut,
Protrusions made of a hollow body having an inner diameter larger than the outer diameter of the locking member and smaller than the outer diameter of the locking member and larger than the diagonal dimension of the nut are provided in the radial center direction. And using protective members
After arranging the protective member in a position to store the nut,
The method for protecting a tightening nut according to claim 1, wherein the locking member is press-fitted into the nut from an open end of the protection member.

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