KR101987381B1 - Anti-loosing apparatus for nut - Google Patents

Abstract

Disclosed is an apparatus for preventing a nut from loosening, which is able to prevent a nut, which is fastened on a screw thread formed on the outer circumferential surface of a body, from loosening. According to the present invention, the apparatus for preventing the nut from loosening, which aims to keep the nut fastened with a bolt, comprises: a loosening prevention unit which is installed by wrapping around the screw thread of the bolt body from the outside of the nut to have at least a part of itself inserted into a gap space of an entrance unit of the screw thread of the nut, and to prevent the nut from rotating in the loosening direction. The loosening prevention unit includes: a coil member formed in a spiral shape along the screw thread formed on the outer circumferential surface of the body of the bolt; and a pressurizing means to pressurize the coil member. The present invention is able to rotate the pressurizing means, to additionally rotate the pressurizing means with a certain torque with one end unit of the coil member inserted into a gap on an entrance unit of the screw thread of the nut, and to allow one end unit of the coil member to forcibly penetrate between the nut and the screw thread of the bolt body, thereby crushing the screw thread and becoming forcibly fastened.

Description

[0001] Anti-loosing apparatus for nut [0002]

The present invention relates to a nut tightening prevention device, and more particularly, to a nut tightening prevention device that can maintain a locked state of a nut even when vibration is continuously applied, thereby enabling a structure fastened with bolts and nuts to maintain a stable state To a nut tightening prevention device.

The bolts and nuts used to couple two or more members to fixtures such as mechanical devices, piers, steel towers, ships, automobiles, airplanes, etc., are used as means for rigidly connecting various devices such as apparatuses and machines have.

1 is a perspective view showing a structure in which a conventional bolt and a nut are fastened together.

As shown in FIG. 1, the bolt and the nut are screwed together to join the two members. When the bolt and nut are fastened and the joint is continuously subjected to vibration or shock, the bolt and nut are fastened together. The phenomenon of slow release in the opposite direction may occur.

For example, in the case of bolts and nuts used for rails or the like provided for running a railway vehicle, bolts and nuts are loosened due to vibrations and shocks generated when the railway vehicle is traveling.

As the bolt and nut are loosened, a clearance of the rail occurs, which may lead to a serious accident.

Such loosening of the bolt and nut occurs in various fields or apparatuses other than the above-mentioned examples, resulting in serious safety accidents.

Especially, in the industrial field where strong impact or vibration is continuously transmitted to the bolt and nut fastening part, it is urgent to prepare a solution to solve the safety problem caused by the bolt loosening phenomenon.

Document 1: Korean Registered Patent No. 10-1163668 "Circular Rod End Connection for Loosening Bolts and Nuts" Document 2: Korean Utility Model Application No. 20-1996-0063719 "Nut Loosening Bolt"

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the conventional art as described above, and it is an object of the present invention to provide a method of continuously maintaining a locked state of a nut by using a bolt and a nut, And an object of the present invention is to provide a nut fastening preventing device.

Particularly, it is an object of the present invention to provide a nut fastening preventing device which is excellent in workability and can be applied to large special bolts as well as a manufacturing process is not complicated, and can be produced at a low unit cost.

The present invention has been conceived in order to solve the above problems, and it is an object of the present invention to provide an apparatus for preventing the unthreading of a nut, which is installed at the rear of the nut to prevent loosening of a nut fastened to a screw thread formed on the outer circumferential surface of the bolt body, And a loosening preventing portion for preventing the nut from rotating in a loosening direction by inserting at least a portion of the bolt into a clearance space of a thread entrance portion of the portion where the bolt and the nut are fastened.

In this case, the unlocking portion includes a coil member formed in a spiral shape along a thread formed on the outer circumferential surface of the bolt body, and a pressing member for pressing the coil member such that the end portion of the coil member is inserted into a spacing space of the thread- . ≪ / RTI >

Meanwhile, the pressing means is formed with a through hole through which a coiled member is inserted into the insertion hole in a cylindrical shape at the center so as to surround the outer surface of the coil member, and a through hole through which the bent other end region of the coil member is inserted.

At least a part of the coil member may have a circular cross section and the one end may have a shape gradually decreasing in diameter toward the tip and the other end may be bent and inserted and fixed to one side of the pressing member .

And at least a portion of the coil member is exposed to the outside of the bottom surface of the pressing member while the other end of the coil member is inserted and fixed in the through hole of the pressing member.

At this time, it is preferable that the outer wall surface of the pressing means is processed to have a polygonal shape, the inner wall surface of the insertion hole is not formed with a thread, and the whole section in the longitudinal direction has the same cross section.

The sum of the height between the through hole and the bottom surface of the pressing means and the height of the coil member protruding from the bottom surface of the pressing means causes the pressing means to rotate so that one end of the coil member The pressing means is further rotated so that the nut is inserted into the gap between the nut and the bolt body in a state of being inserted into the gap so that the one end of the coil member is engaged with the thread while causing friction with the thread, It is preferable to design so as to have a height which is exactly in contact with the upper surface.

In addition, a fastening hole communicating with the through hole may be formed at one side of the outer surface of the pressing means, and a plate bolt may be fastened to the fastening hole to fix the other end of the coil member inserted into the through hole.

At this time, it is preferable that an inclined surface is provided on the outer surface of the pressing means of the periphery of the fastening hole which is in contact with the outer surface of the plate bolt, and the outer surface of the plate bolt which is in contact with the inclined surface is formed to be inclined corresponding to the inclined surface.

When the plate bolt is fastened to the fastening hole, it is effective that a polygonal tool insertion hole is formed at the center of the outer surface exposed to the outside.

The nut tightening prevention device according to the present invention can maintain the locked state of the nut firmly, thereby maintaining the stable state of the structure fastened with the bolt and the nut.

Also, it can be applied to large special bolts that are easy to process and used for industrial purposes.

In addition, by applying a relatively simple structure, it is possible to realize economical efficiency by suppressing an increase in manufacturing cost.

1 is a perspective view showing a structure in which a conventional bolt and a nut are fastened,
FIG. 2 is an exploded perspective view illustrating a structure of a nut tightening prevention device according to an embodiment of the present invention,
FIG. 3 is a perspective view illustrating a structure in which a nut tightening prevention device according to an embodiment of the present invention is assembled,
FIG. 4 is a cutaway perspective view of a part of a nut tightening prevention device according to an embodiment of the present invention,
FIG. 5 is a side view illustrating a structure of a nut prevention device according to an embodiment of the present invention,
6 is a side view showing a structure in which a nut tightening prevention device according to an embodiment of the present invention is fastened to a bolt,
7 is a perspective view illustrating a structure in which a nut tightening prevention device according to an embodiment of the present invention is fastened to a bolt,
FIG. 8 is a cutaway perspective view showing a part of a structure of a nut fastening device according to an embodiment of the present invention fastened to a bolt,
Fig. 9 is a longitudinal sectional view showing a structure in which a nut fastening preventing device according to line A in Fig. 7 is fastened to a bolt,
Fig. 10 is a longitudinal sectional view showing a structure in which a nut tightening prevention device according to line B in Fig. 7 is fastened to a bolt,
Fig. 11 is a longitudinal sectional view showing a structure in which a nut tightening prevention device according to line C in Fig. 7 is fastened to a bolt,
FIG. 12 is an exploded perspective view illustrating a structure of a nut tightening prevention device according to another embodiment of the present invention,
FIG. 13 is a perspective view illustrating a structure in which a nut tightening prevention device according to another embodiment of the present invention is assembled,
FIG. 14 is a cutaway perspective view showing a part of a nut tightening prevention device according to another embodiment of the present invention,
15 is a side view showing a structure of a nut unlocking device according to another embodiment of the present invention,
16 is a longitudinal sectional view showing an initial structure in which a nut tightening prevention device according to another embodiment of the present invention is fastened to a bolt,
17 is a longitudinal sectional view showing a structure in which a nut tightening prevention device according to another embodiment of the present invention is fastened to a bolt,
FIG. 18 is an exploded perspective view of a nut detaching device according to another embodiment of the present invention,
19 is a perspective view illustrating a structure in which a nut tightening prevention device according to another embodiment of the present invention is assembled,
20 is a longitudinal sectional view showing a structure of a nut tightening prevention device according to another embodiment of the present invention,
21 is a perspective view showing an initial structure in which a nut unlocking device according to another embodiment of the present invention is fastened to a bolt,
22 is a perspective view showing a structure in which a nut tightening prevention device according to yet another embodiment of the present invention is fastened to a bolt.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the present invention and the accompanying drawings, wherein like reference numerals refer to like elements.

It is to be understood that when an element is referred to as being "comprising" another element in the description of the invention or in the claims, it is not to be construed as being limited to only that element, And the like.

FIG. 1 is a perspective view illustrating a structure in which a conventional bolt and a nut are fastened together, FIG. 2 is an exploded perspective view illustrating a structure of a nut unfastening device according to an embodiment of the present invention, FIG. 4 is a perspective view illustrating a cutaway portion of a nut detaching device according to an embodiment of the present invention. FIG. 5 is a perspective view of the present invention FIG. 6 is a side view illustrating a structure in which a nut tightening prevention device according to an embodiment of the present invention is fastened to a bolt, and FIG. 7 is a side view of a nut fastening preventing device according to an embodiment of the present invention. FIG. 8 is a perspective view illustrating a part of a structure in which a nut tightening prevention device according to an embodiment of the present invention is fastened to a bolt. FIG. 8 is a perspective view showing a structure in which a nut fastening preventing device according to an embodiment of the present invention is fastened to a bolt. Fig. 9 is a vertical sectional view showing a structure in which a nut tightening prevention device according to line A in Fig. 7 is fastened to a bolt, Fig. 10 is a sectional view showing a nut tightening prevention device according to line B in Fig. 7 FIG. 11 is a longitudinal sectional view showing a structure in which a nut tightening prevention device according to line C of FIG. 7 is fastened to a bolt, and FIG. 12 is a longitudinal sectional view showing a structure according to another embodiment of the present invention FIG. 13 is a perspective view illustrating a structure in which a nut tightening prevention device according to another embodiment of the present invention is assembled, and FIG. 14 is a perspective view illustrating a nut fastening preventing device according to another embodiment of the present invention. FIG. 15 is a side view showing the structure of a nut unlocking device according to another embodiment of the present invention, and FIG. 16 is a side view of a nut detaching device according to another embodiment of the present invention. Nut pool 17 is a longitudinal sectional view showing a structure in which a nut tightening prevention device according to another embodiment of the present invention is fastened to a bolt, FIG. 18 is a longitudinal sectional view showing an initial structure in which the present invention FIG. 19 is a perspective view illustrating a structure in which a nut tightening prevention device according to another embodiment of the present invention is assembled, and FIG. 19 is a perspective view showing a structure in which a nut tightening prevention device according to another embodiment of the present invention is assembled. 21 is a diagram illustrating an initial structure in which a nut tightening prevention device according to another embodiment of the present invention is fastened to a bolt according to another embodiment of the present invention FIG. 22 is a perspective view showing a structure in which a nut tightening prevention device according to another embodiment of the present invention is fastened to a bolt. FIG.

The present invention will now be described with reference to the accompanying drawings.

The nut tightening prevention device according to the present invention is an apparatus for preventing the nut 100, which is fastened to the thread of the bolt 10 inserted through the fastening hole formed in the fastening object, to fix the fastening object.

As shown in the accompanying drawings, in order to hold the nut 100 in a state of being fastened to the bolt 10, the nut unfastening device according to the present invention is installed at the rear of the nut 100, And a loosening preventing part 200 inserted into the spacing space of the screw 100 of the nut 100 to prevent the nut 100 from rotating in the loosening direction.

The bolt 10 is composed of a cylindrical body having threads formed along the outer circumferential surface thereof and a head formed to have a diameter larger than the diameter of the body. At this time, the body is pierced by the fastening holes formed in the fastening object, the head is pushed until it can not pass through the fastening hole, and then the nut is screwed into the outer peripheral thread 11 of the body protruding to the opposite side through the fastening hole 100).

A thread 11 having a predetermined pitch is formed in a spiral shape on the outer circumferential surface of the body of the bolt 10 so as to be mutually coupled with the thread 101 formed on the inner circumferential surface of the nut 100.

The nut 100 is fastened to the thread 11 on the outer circumferential surface of the body of the bolt 10 protruding to the opposite side through the fastening hole to press the fastening object to fix the fastening object. The outer circumferential surface of the nut 100 has a polygonal structure such as a hexagonal shape and is tightly fastened to the body of the bolt 10 by rotating using a tool such as a spanner.

On the other hand, the threads 101 formed on the inner circumferential surface of the nut 100 have slightly lower thread heights at the both ends of the threads 101 to form a clearance space. That is, the inclined surface of the thread 101 is machined and machined so that the body of the bolt 10 can be easily inserted therebetween so that the threads 11 and 101 can be engaged with each other.

In other words, when the nut 100 is fastened to the body of the bolt 10, most of the thread 101 of the nut 100 comes into close contact with the thread 11 formed on the outer surface of the body of the bolt 10, A clearance space is formed in the entrance portion of the thread 101 of the screw 100.

The nut 100 has an upper surface and a lower surface formed with a sloped surface that is sloped slightly larger than the outer diameter of the thread 101. This is because when the nut 100 is fastened to the bolt 10, . As a result, a clearance is created in the first thread of the bolt 10 which goes inwardly from the upper surface of the nut 100 in the boundary line.

The unlocking preventing portion 200 of the nut unlocking device according to the present invention includes a coil member 210 formed to be wound in a spiral direction along a thread 11 formed on the outer circumferential surface of the body of the bolt 10, And a pressing means (220) for pressing the bolts (210) to be inserted into the threads (11) formed on the outer circumferential surface of the body of the bolt (10).

The coil member 210 is a member in which a linear metal is wound in a spiral shape so as to form a constant height so as to be formed into a coil shape so that its inner diameter can be inserted into the thread 11 formed on the outer surface of the bolt 10, It shall be designed to have appropriate inner diameter and diameter considering the pitch (11) pitch and outer diameter of bolt (10).

On the other hand, the most part of the coil member 210 preferably has a circular cross-sectional structure, but the one end region has a shape in which the diameter gradually decreases toward the tip end. For example, it may be designed to have a rectangular cross section, but the cross sectional area may be gradually narrowed toward the leading end, or the cross section of the coil member 210 may be diagonally cut to form a peak or a conical shape.

The coil member 210 has a fastening insertion portion of a bottom surface having the same pitch as the thread 11 of the bolt 10 so that the thread 11 of the initial bolt 10 can be easily fastened. So that it can be fastened by a tensile force.

At least a part of the region of the coil member 210 is not exposed to the outside of the bottom surface of the pressing means 220 while the other end of the coil member 210 is inserted and fixed in the through hole 222 of the pressing means 220 A change occurs in the pitch of the coil member 210 when the thread 11 of the bolt 10 is fastened and exposed to the outside of the bottom surface of the coil member 210. [

At this time, it is preferable that the outer wall surface of the pressing means 220 is processed to have a polygonal shape, and the inner wall surface of the insertion hole is not formed with a thread, and the whole section in the longitudinal direction has the same cross section.

On the other hand, the other end region is bent and inserted into one side of the pressing means 220 and fixed.

This is to allow the tip of the coil member 210 to be easily inserted into the space of the inlet 101 of the nut 101 of the nut 100.

Meanwhile, although the coil member 210 has a shape similar to that of a spring, its role is completely independent of the spring, and therefore, it is preferable that the coil member 210 is made of a helical coil having a large elastic modulus or a high tensile force.

The pressing means 220 is formed by drilling an insertion hole 221 in a cylindrical shape at the center so as to surround the outer surface of the coil member 210, A through hole 222 into which the bent other end region is inserted is formed.

The through-hole 222 may be provided with an insertion path that is fixed by the plate bolt 226 to facilitate insertion of the other end of the coil member 210.

The coil member 210 has a structure in which at least a part of the region of the coil member 210 is exposed to the bottom of the pressing member 220 while the other end region of the coil member 210 is inserted and fixed in the through hole 222 .

One end of the coil member 210 exposed to the bottom surface of the pressing member 220 is inserted into the space of the thread 101 of the nut 100 as described later and the thread 100 of the nut 100 101, 11) to fix the nut (100).

The diameter of the insertion hole 221 formed in the center portion of the pressing means 220 in the longitudinal direction is designed so that the outermost side of the coil member 210 is in close contact with the inner surface of the insertion hole 221 as much as possible.

If the coil member 210 rotates the pressing means 220 when the bolt 10 is inserted into the insertion hole 221 and there is a large space between the inner side surface of the insertion hole 221 and the coil member 210, And it may expand until it is in close contact with the inner surface of the insertion hole 221 without digging into the gap between the threads 101 and 11, thereby making it difficult to perform precise construction.

Accordingly, the diameter of the insertion hole 221 and the coil member 210 must be accurately designed so that the distance between the inner side surface of the insertion hole 221 and the coil member 210 has a value less than the threshold value.

The sum of the height between the through hole 222 and the bottom surface of the pressing means 220 and the height of the coil member 210 protruding from the bottom surface of the pressing means 220 is set to be, (Second rotation) of the pressing means 220 at a predetermined torque value in a state in which one end of the nut 100 is inserted into the first engagement portion of the thread 101 of the nut 100 (first rotation) The bottom surface of the pressing means 220 is accurately brought into contact with the upper surface of the nut 100 when one end of the pressing member 210 is inserted into the gap between the nut 100 and the threads 101 and 11 of the bolt 10. [ .

That is, depending on the pitch and height of the threads 101 and 11, the rigidity of the material, the thickness of the end face of the coil member 210, and the rigidity of the material, , So that it is determined at what angle the coil member 210 is to be pierced.

The height of the coil member 210 between the through hole 222 and the bottom surface of the pressing means 220 and the height of the coil member 210 by the secondary pressing of the pressing means 220 220 are precisely determined.

The diameter of the coil member 210 protruding outside the bottom surface of the pressing means 220 is proportional to the pitch of the thread 11 formed on the outer surface of the bolt 10, It is inversely proportional to the length.

That is, if the pitch of the thread 11 to which the coil member 210 is to be inserted is large, the diameter of the coil member 210 must be large. Conversely, if the pitch of the thread 11 to which the coil member 210 is to be inserted is small The diameter of the coil member 210 should be small.

When the diameter of the coil member 210 is small, the length of one end of the coil member 210 to be inserted between the threads 101 and 11 must be designed to be long. On the other hand, when the diameter of the coil member 210 is large, the length of one end of the coil member 210 to be inserted and inserted between the threads 101 and 11 must be designed to be short.

It is preferable that the outer wall surface of the pressing member 220 is cut so as to have a polygonal shape so that the end portion of the coil member 210 is inserted into the gap between the bolts 10 and the thread portions 101, So that a tool such as a spanner can be used when the pressing means 220 is rotated secondarily.

A process of installing the nut tightening prevention device according to the present invention having the above-described structure will be described with reference to FIGS. 8 to 10. FIG.

First, the bolts 10 are inserted into the fastening holes formed in the mounting object, and the nuts 100 are fastened along the outer circumferential surface of the body of the bolt 10 protruded to the opposite side through the fastening holes of the mounting object.

Then, the pressing member 220 is rotated (primary rotation) so that the coil member 210 is wound along the thread 11 formed on the outer circumferential surface of the body of the bolt 10. At this time, the tip of one end of the coil member 210 is rotated until it is inserted into the space 101 of the nut 101 of the nut 100.

9, it can be seen that one end of the coil member 210 is inserted into the clearance of the initial penetration of the threads 101 of the nut 100. As shown in FIG.

9, one end portion of the coil member 210 is connected to the bolt 10 and the nut 100 (see Fig. 9) The threads (101, 11) are squeezed into the gap. The one end of the coil member 210 rubs against the threads 101 and 11 of the bolt 10 and the nut 100 by strongly rotating the pressing means 220 at a predetermined torque value during the secondary rotation, .

Whereby one end of the coil member 210 is permanently fastened and fixed to the gap between the bolts 10 and the threads 101 of the nut 100. [

When the one end of the coil member 210 is pierced by the predetermined length of the threads 101 and 11 of the bolt 10 and the nut 100, the lower surface of the pressing means 220 contacts the upper surface of the nut 100 So that the installation of the nut tightening prevention device is completed.

12 to 17 are views showing a nut unclamping apparatus according to another embodiment of the present invention, and a detailed description of the same parts as the nut unclamping apparatus according to an embodiment of the present invention will be omitted.

12 to 17, in the nut tightening prevention device according to another embodiment of the present invention, the screw member 224 is formed on the inner surface of the upper portion of the pressing means 220, 224, respectively.

Since the threaded portion 224 is formed on the inner surface of the upper portion of the pressing means 220 so as not to tighten the torque depending on the tension of the coil member 210 when the pressing means 220 is fastened to the bolt 10, The tightening force between the bolt 10 and the pressing means 220 can be doubled because the torque can be tightened by the tightening force between the screw thread 11 formed on the outer surface and the screw thread 224 formed on the inner surface of the upper portion of the pressing means 220. [ There is an effect.

When one end of the coil member 210 is inserted into the gap between the nut 100 and the screw thread of the body of the bolt 10, the inner surface of the pressing member 220, which is in close contact with the upper surface of the nut 100, A tip member 223 is formed to protrude at a predetermined height.

Since the tip member 223 protrudes at a predetermined height from the inner surface of the inner surface of the pressing means 220, the tip member 223 covers the space formed at the inner upper end of the nut 100, So that the nut 100 can be effectively pinched between the nuts 100 and the thread gaps of the body of the bolt 10, thereby effectively preventing the nut 100 from being loosened.

A process of installing the nut tightening prevention device according to another embodiment of the present invention having the above-described structure will be described with reference to FIGS. 16 and 17. FIG.

16, a bolt 10 is inserted into a fastening hole formed in an object to be fastened, a nut 100 is passed along the outer circumferential surface of the body of the bolt 10 protruded to the opposite side through the fastening hole of the object to be fastened Conclude.

The threaded portion 224 formed on the inner surface of the upper portion of the pressing means 220 is rotated by rotating the pressing means 220 so that the threaded portion 11 is fastened to the threaded portion 11 formed on the outer peripheral surface of the body of the bolt 10, So that the coil member 210 is wound. At this time, the tip of one end of the coil member 210 is rotated until it is inserted into the space 101 of the nut 101 of the nut 100.

It can be seen that one end of the coil member 210 is inserted into the initial gap formed in the thread 101 of the nut 100 at the same time as the tip member 223 is inserted into the nut 101. At this time, It is possible to confirm that the clearance space formed in the thread 101 of the body 100 is filled up.

17, when one end of the coil member 210 is in contact with the bolt 10 and the nut 100, as shown in Fig. 17, The threads (101, 11) are squeezed into the gap. The one end of the coil member 210 crushes the threads 101 and 11 of the bolt 10 and the nut 100 by pivoting the pressing means 220 strongly at a predetermined torque value during the secondary rotation do.

Whereby one end of the coil member 210 is permanently fastened and fixed to the gap between the bolts 10 and the threads 101 of the nut 100. [

When the one end of the coil member 210 is pierced by the predetermined length of the threads 101 and 11 of the bolt 10 and the nut 100, the lower surface of the pressing means 220 contacts the upper surface of the nut 100 So that the installation of the nut tightening prevention device is completed.

18 to 22 are explanatory views of the same parts as those of the nut unclamping apparatus according to the embodiment of the present invention, and will not be described in detail.

The coil member 210 may be a compression spring, but the upper portion may be formed as a tensile region to which a tensile force acts, and the lower portion may have a compression region to which a compressive force acts, as shown in FIG.

A through hole 222 communicating with the through hole 222 is formed at one side of the outer surface of the pressing means 220. A plate bolt 226 is coupled to the through hole 225, And the other end of the member 210 is fixed.

The coil member 210 is inserted into the through hole 222 at a minimum permissible clearance in order to prevent the nut 100 from being released even under vibration or impact. There is a problem that the nut 100 is not fixed properly when the inner diameter of the through hole 222 is increased for workability. In order to solve this problem, in the present embodiment, A ball 225 and a plate bolt 226 were employed.

A fastening hole 225 communicating with the through hole 222 is formed at one side of the outer surface of the pressing means 220 so that the other end of the coil member 220 is accurately inserted into the through hole 222 and fixed, And can be easily performed.

Not only the other end of the coil member 220 is accurately fixed but also the thread formed on the outer surface of the plate bolt 226 comes into close contact with the other end of the coil member 220, The through hole 222 can be firmly fixed to allow accurate operation.

An inclined surface 227 is provided on the outer surface of the pressing means 220 at the periphery of the fastening hole 225 which is in contact with the outer surface of the plate bolt 226. An outer surface of the plate bolt 226 which is in contact with the inclined surface 227 is inclined 227, it is possible to prevent the flow from occurring.

When the plate bolt 226 is fastened to the fastening hole 225, a polygonal tool insertion hole 226a is formed at the center of the outer surface exposed to the outside, for ease of assembly.

In the case where the coil member 210 is a compression spring and has a tensile region at the top, the principle of fixing the nut so as not to be loosened is different.

When a tensile region is provided at the upper end of the coil member 210, a tensile force is applied to tighten the thread 11 of the bolt 10 while expanding the tensile region at the time of fastening with the bolt 10. When the bolt 10 is tightened once, the bolt 10 can not be pulled out due to the tensile force applied to the thread 11.

On the other hand, the case where the coil member 210 is a compression spring is slightly different from this. The clearance between the coil member 210 and the pressing means 220 is slightly widened after fastening with the bolt 10, and the clearance is lost. The inner diameter of the coil member 210 is smaller than the outer diameter allowed by the thread 11 of the bolt 10 so that the coil member 210 is slightly expanded after fastening and the clearance with the pressing means 220 is lost, .

A process of installing the nut tightening prevention device according to another embodiment of the present invention having the above-described structure will be described with reference to FIGS. 21 and 22. FIG.

First, the bolts 10 are inserted into the fastening holes formed in the mounting object, and the nuts 100 are fastened along the outer circumferential surface of the body of the bolt 10 protruded to the opposite side through the fastening holes of the mounting object.

The other end of the coil member 210 is fixed by fastening the plate bolt 226 to the fastening hole 225 while the other end of the coil member 210 is inserted into the fastening hole 225, And the coil member 210 is wound along the thread 11 formed on the outer circumferential surface of the body of the bolt 10 by rotating the pressing means 220 that has been assembled mutually. At this time, the tip of one end of the coil member 210 is rotated until it is inserted into the space 101 of the nut 101 of the nut 100.

22, it can be seen that one end of the coil member 210 is inserted into the clearance of the initial penetration of the threads 101 of the nut 100. As shown in FIG.

22, the one end portion of the coil member 210 is engaged with the bolt 10 and the nut 100 so that one end of the coil member 210 is engaged with the bolt 10 and the nut 100. As a result, The threads (101, 11) are squeezed into the gap. The bolt 10 and the threads 100 of the nut 100 are frictionally engaged with one end of the coil member 210 by rotating the pressurizing means 220 with a predetermined torque value during the secondary rotation, .

Whereby one end of the coil member 210 is permanently fastened and fixed to the gap between the bolts 10 and the threads 101 of the nut 100. [

When the one end of the coil member 210 is pierced by the predetermined length of the threads 101 and 11 of the bolt 10 and the nut 100, the lower surface of the pressing means 220 contacts the upper surface of the nut 100 So that the installation of the nut tightening prevention device is completed.

The nut unclamping device according to the present invention can be used not only for railway rails but also for fastening bridge structures or bridges with vibration, soundproof tunnels, and soundproof walls.

The technical idea of the present invention has been described through several embodiments.

It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described above from the description of the present invention. Further, although not explicitly shown or described, those skilled in the art can make various modifications including the technical idea of the present invention from the description of the present invention Which is still within the scope of the present invention. The above-described embodiments described with reference to the accompanying drawings are for the purpose of illustrating the present invention, and the scope of the present invention is not limited to these embodiments.

INDUSTRIAL APPLICABILITY The present invention can be applied to the field of construction, civil engineering, and machine assembly techniques for fixing a fixed object.

10: Bolt 11: Threaded
100: Nut 200: Release prevention part
210: coil member 220: pressing means
221: insertion hole 222: through hole
223: tip member 224:
225: fastening hole 226: plate bolt
227:

Claims (12)

A nut tightening prevention device for preventing the tightening of a nut (100) fastened to a screw thread formed on an outer peripheral surface of a bolt (10)
The nut 100 is installed to surround the threads of the body of the bolt 10 from the outside of the nut 100 to maintain the state that the nut 100 is fastened to the bolt 10, (200) for preventing the nut (100) from rotating in the releasing direction by inserting at least a part of the nut (100) into the clearance space. The method according to claim 1,
The release preventing portion 200 includes a coil member 210 spirally formed along a thread 11 formed on an outer circumferential surface of the body of the bolt 10,
At least a portion of the coil member 210 is inserted into the thread 11 formed on the outer surface of the bolt 10 and one end of the coil member 210 is inserted into the gap between the threads of the nut 100 And a pressing means (220) which pressurizes the nut. 3. The method of claim 2,
At least a part of the coil member 210 has a circular cross-section. One end of the coil member 210 has a shape gradually decreasing in diameter toward the tip, and the other end is bent and inserted into one side of the pressing member 220, Nut loosening prevention device. The method of claim 3,
An insertion hole 221 is formed in a cylindrical shape at the center so as to surround the outer surface of the coil member 210. The pressing member 220 is formed at one side of the inner wall surface of the insertion hole 221, A through hole 222 through which the bent end portion is inserted is formed,
The coil member 210 has a structure in which one end of the coil member 210 protrudes to the outside of the lower side of the pressing means 220 while the other end of the coil member 210 is inserted and fixed in the through hole 222, Device. 5. The method of claim 4,
Wherein the inner wall surface of the insertion hole (221) has the same cross section between the front and rear sides without forming a thread, while the outer wall surface of the pressing means (220) is processed to have a polygonal shape. 6. The method of claim 5,
The sum of the height between the through hole 222 and the bottom surface of the pressing means 220 and the height of the coil member 210 protruding from the bottom surface of the pressing means 220 rotates the pressing means 220 The pressing member 220 is inserted into the gap between the nut 100 and the screw thread of the body of the bolt 10 in a state where one end of the coil member 210 is inserted into the clearance of the entrance of the screw thread of the nut 100, So that the lower surface of the pressing means 220 is brought into close contact with the upper surface of the nut 100 in a state in which one end of the coil member 210 is screwed while being screwed. 5. The method of claim 4,
A threaded portion 224 is formed on the upper inner surface of the pressing means 220 and the coiled member 210 is installed on the lower portion of the threaded portion 224. [ 8. The method of claim 7,
When one end of the coil member 210 is inserted into a thread gap of the nut 100 and the threaded portion of the body of the bolt 10 in the inner diameter surface of the pressing means in close contact with the upper surface of the nut 100, And a tip member (223) for preventing deformation of the nut (223) is protruded at a predetermined height. The method according to claim 6,
A through hole 222 communicating with the through hole 222 is formed at one side of the outer surface of the pressing means 220. A plate bolt 226 is coupled to the through hole 222, And the other end of the coil member (210) is inserted. 10. The method of claim 9,
An inclined surface 227 is provided on the outer surface of the pressing means 220 at the periphery of the fastening hole 225 which is in contact with the outer surface of the plate bolt 226 and the outer surface of the plate bolt 226 contacting the inclined surface 227 And an outer surface thereof is inclined to correspond to the inclined surface (227). 10. The method of claim 9,
And a polygonal tool insertion hole (226a) is formed at the center of the outer surface of the plate bolt (226) exposed to the outside when the plate bolt (226) is fastened to the fastening hole (225). 10. The method of claim 9,
The upper portion of the coil member 210 is formed as a tensile region to which a tensile force acts and the lower portion is formed as a compressive region to which a compressive force acts.

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