KR102087632B1 - Anti-loosing apparatus for nut - Google Patents

Abstract

The present invention provides an anti-loosening device for a nut, capable of preventing a nut coupled to a screw thread formed on the outer circumference of a body of a bolt from being loosened. According to the present invention, the anti-loosening device for a nut includes: a spring rotating along the screw thread of the body of the bolt; a cap member covering the spring and the nut; and a leaf spring including an insertion hole, wherein a plate surface is formed to be bent in the leaf spring. One end of the spring has the diameter larger than the diameter of the screw thread of the body of the bolt. The spring includes a free end coming into contact with one side of the nut when the spring is installed. Also, the other end of the spring includes a fixed end bent to the outside. The cap member includes: an opening surface formed as one side of the outer surface is cut to the other side in a part in which the nut and the spring are inserted; and a mounting groove formed to be dent from the opening surface at a predetermined depth.

Description

Anti-loosing apparatus for nut

The present invention relates to a nut loosening prevention device, and more particularly, to ensure that the nut is firmly locked even when vibration is continuously applied, thereby allowing the structure fastened using the bolt and the nut to maintain a stable state. It relates to a nut loosening prevention device.

Bolts and nuts are commonly used to join two or more members together in various installations and devices, such as machinery, piers, steel towers, ships, automobiles, and aircraft.

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

As shown in Figure 1, the bolt and nut are screwed together to join the two members, the bolt and nut is fastened when a constant vibration or shock is applied to the fastening portion from the outside while the bolt and nut is fastened. Slow release in the opposite direction may occur.

For example, in the case of a bolt and nut used for a rail provided for traveling of a railway vehicle, the loosening phenomenon of a bolt and nut arises because of the vibration and the shock which generate | occur | produce when the railway vehicle runs.

In addition, the loosening of the bolt and nut causes loosening of the rail, which may lead to a large accident.

Such loosening of bolts and nuts may occur in various sites or devices other than those exemplified above, causing serious safety accidents.

In particular, in an industrial site where a strong shock or vibration is continuously transmitted to the fastening portion of the bolt and the nut, it is urgent to prepare a method for solving the safety problem caused by the loosening of the bolt.

Document 1: Republic of Korea Patent No. 10-1163668 "A round bar connector for preventing loosening of bolts and nuts" Document 2: Korean Utility Model Application No. 20-1996-0063719 "Nut Loosening Bolt"

The present invention is to solve the problems of the prior art as described above, by maintaining the nut locked state even if a constant vibration is applied, so that the structure fastened using the bolt and nut to maintain a stable state It is an object to provide a nut loosening prevention device.

In particular, it is an object to provide a nut loosening prevention device that can be applied to the existing bolts and nuts as it is to ensure versatility.

The present invention has been made to solve the above problems, the nut loosening prevention device according to the present invention is

A spring rotating along the thread of the bolt body;

A cap member covering the nut and the spring; And

And a leaf spring fastened to the cap member.

At this time, the spring has a free end having a diameter larger than the diameter of the bolt body screw thread at one end,

After rotating the spring along the thread of the bolt body, it may be installed by fastening the leaf spring to the spring.

On the other hand, the other end of the spring may be further provided with a fixed end bent in the outward direction.

The leaf spring is provided with an insertion hole fastened to the fixed end of the spring, the spring can be fixed by inserting the fixed end in the insertion hole.

Meanwhile, the connection portion of the free end and the region excluding the free end may be formed to be bent downwardly in a predetermined angle diagonal direction.

On the other hand, the cap member has an opening surface formed by cutting one side of the outer surface to the other side of the portion where the nut and the spring is inserted; And a mounting groove in which a predetermined depth is recessed from the opening surface and into which the leaf spring is inserted.

The plate surface of the leaf spring is bent to form an inclination at a predetermined angle, it may have a feature of pressing in the inward direction in the state inserted into the mounting groove.

On the other hand, a separate cover member for covering the opening surface of the cap member; may be further provided, wherein the cover member and the leaf spring may be integrally formed by the insert injection method.

The installation process of the nut loosening prevention apparatus according to the present invention is as follows.

First lock the nut to the bolt, then rotate the spring.

At this time, the free end is sufficiently rotated until the free end is in close contact with the upper surface of the nut, so that the fixed end is brought into a position capable of fastening with the leaf spring.

The presence of the free end allows fine adjustment of the position of the fixed end.

Thereafter, the nut is covered with a cap member, and then a nut loosening prevention device can be installed by inserting one end of the leaf spring into the mounting groove of the cap member and fixing the spring position by inserting the fixing end into the insertion hole. have.

According to the present invention, even if the vibration and continuous vibration is applied to the nut and bolt, there is an effect that the nut does not loosen because the cap member and the cover member keep the position and angle of the nut and the fixed end constant.

On the other hand, since there is a free end at one end of the spring, while the spring is sufficiently rotated to fix the nut, the spring is more easily wound or loosened so that the fixed end is in a position capable of fastening to the leaf spring. Can catch. Accordingly, there is an effect that the construction is simple.

In addition, after disassembling in the reverse order of installation, it is possible to disengage in the opposite direction to the insertion of the bolt by holding the free end, so that the product can be easily disassembled without damaging the product.

In addition, since it can be applied to existing bolts and nuts as it is, it is excellent in versatility and economical because there is no need to manufacture nuts and bolts separately.

1 is a perspective view showing a structure in which a conventional bolt and nut are fastened,
Figure 2 is an exploded perspective view showing an exploded structure of the nut loosening prevention apparatus according to an embodiment of the present invention,
3A and 3B are enlarged perspective views illustrating an enlarged structure of a spring provided in a nut loosening prevention device according to an embodiment of the present invention.
4 is a perspective view showing a structure in which the nut loosening prevention apparatus according to an embodiment of the present invention is assembled;
Figure 5 is a perspective view showing a structure of the nut loosening prevention apparatus according to an embodiment of the present invention viewed from the rear,
Figure 6 is a perspective view showing a perspective view of the structure of the nut loosening prevention apparatus according to an embodiment of the present invention,
7A to 7C are assembly views sequentially showing operations of assembling a nut loosening prevention device according to an embodiment of the present invention to a bolt.
8 is a longitudinal cross-sectional view showing a structure in which the nut loosening prevention apparatus according to an embodiment of the present invention is assembled.

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

When any component in the description or claims of the invention "includes" another component, unless otherwise stated, it is not limited to consisting only of the component and is not interpreted, other components It should be understood that it may include more.

Figure 2 is an exploded perspective view showing the structure of the nut loosening prevention apparatus according to an embodiment of the present invention, Figures 3a and 3b is a structure of a spring provided in the nut loosening prevention apparatus according to an embodiment of the present invention Figure 4 is an enlarged perspective view showing an enlarged, Figure 4 is a perspective view showing the structure of the nut loosening prevention apparatus according to an embodiment of the present invention, Figure 5 is a nut loosening prevention apparatus according to an embodiment of the present invention Figure 6 is a perspective view showing a structure viewed from the rear, Figure 6 is a perspective view showing a structure in which the nut loosening prevention apparatus according to an embodiment of the present invention is assembled, Figure 7a to Figure 7c is an embodiment of the present invention FIG. 8 is an assembly view sequentially illustrating an operation of assembling the nut loosening prevention device according to the bolt, and FIG. 8 is a longitudinal cross-sectional view illustrating a structure in which the nut loosening prevention device according to an embodiment of the present invention is assembled.

The present invention will be described below with reference to the accompanying drawings presented as above.

The present invention is a device for preventing the nut 20 that 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, the nut loosening prevention device according to the present invention in order to maintain the nut 20 is fastened to the bolt 10, the spring 100 and the cap at the rear of the nut 20 A nut loosening prevention device including a member 200 and a leaf spring 300 may be installed to prevent the nut 20 from rotating in the loosening direction.

First, the bolt 10 is composed of a cylindrical body with a thread formed along the outer circumferential surface, and a head formed to have a diameter larger than the diameter of the body. At this time, the body penetrates through the fastening hole formed in the fastening object, and pushes the head until it catches without passing through the fastening hole. Tighten by tightening.

A thread having a constant pitch is formed on the outer circumferential surface of the bolt 10 in a helical shape so that the bolt 10 is fastened to the thread formed on the inner circumferential surface of the nut 20.

The nut 20 is fastened to a screw thread 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 20 usually has a polygonal structure such as a hexagon and is firmly fastened to the body of the bolt 10 by rotating by using a tool such as a spanner.

Meanwhile, the nut loosening prevention device according to the present invention is a nut loosening prevention device for preventing loosening of the nut 20 fastened to a screw thread formed on the outer circumferential surface of the bolt 10.

A spring 100 that rotates along the thread of the bolt 10 body;

A cap member 200 covering the nut 20 and the spring 100; And

The plate surface is bent, the insertion hole 310 is passed through the plate spring 300 is provided; is provided.

At this time, the spring 100 has a free end 110 formed to have a diameter larger than the diameter of the bolt 10 body screw thread at one end, the other end is provided with a fixed end 120 bent in the outward direction do.

At this time, the pitch of the free end 110 is preferably different from the pitch of the bolt 10 body thread. Free end 110 is a portion that is not fixed in the installation process of the nut loosening prevention device according to the present invention, the free end 110 is formed at one end of the spring 100 is the position of the fixed end 120 This is to make fine adjustment.

Due to the presence of the free end 110, the spring 100 is sufficiently rotated along the thread of the bolt 10 body so that the free end 110 is in close contact with the upper surface of the nut 20. Since it is possible to rotate the spring 100 to a certain degree for positioning or to loosen the spring 100 slightly to the extent that the nut 20 is sufficiently fixed, the axial direction of the bolt 10 or the nut ( It is possible to fine-tune the position of the fixed end 120 on the basis of the rotation direction of 20).

On the other hand, the inner diameter of the body except the free end 110 of the spring 100 is formed to be smaller than the diameter of the screw thread formed on the outer diameter of the bolt 10, the spring 100 is opened as the screw thread is fastened To create tension. The spring 100 is fixed to the bolt 10 by this tension.

Holding the fixing end 120 and rotating in the nut 20 fastening direction is fixed while being wound on the thread of the bolt (10).

After the cap member 200 is fastened, the spring 100 may be adjusted in the locking direction so that the fixed end 120 is fitted into the insertion hole 310 provided in the leaf spring 300.

Spring 100 may be formed as a compression coil spring as shown in Figure 3a, but as shown in Figure 3b, the upper portion is composed of a tension coil 101 spring, the lower portion is composed of a compression coil 102 spring You may.

On the other hand, if you want to dismantle the nut loosening device according to the present invention by holding the free end 110 of the spring 100 and turning in the opposite direction to the nut 20, the spring 100 is released.

The cap member 200 has an opening surface 210 formed by cutting one side of the outer surface to the other side of the portion where the nut 20 and the spring 100 are inserted; And a mounting groove 220 recessed in a predetermined depth from the opening surface.

Meanwhile, after locking the nut 20 to the bolt 10, the spring 100 is rotated to closely contact the free end 110 to an upper surface of the nut 20.

The fixed end 120 is positioned at the center of any one surface of the hexagonal surface of the nut 20.

Subsequently, the nut 20 is covered with the cap member 200, and the fixed end 120 of the spring 100 is visually discernible through the opening surface 210, and then the leaf spring 300 is formed. One end of the insert is inserted into the mounting groove 220.

At this time, the other end of the leaf spring 300 is fastened so as not to be caught by the fixed end 120, the fixed end 120 is inserted into the insertion hole 310. The leaf spring 300 is bent to form a predetermined angle toward the body of the bolt 10 to press the fixed end 120 is inserted into the insertion hole 310.

If the position of the fixed end 120 and the insertion hole 310 is not accurately engaged, the spring 100 may be finely rotated to adjust and adjust the position of the fixed end 120.

The spring 100 is installed to surround the thread of the bolt 10 body from the outside of the nut 20, the lower end is provided with a free end 110 in contact with the nut 20 and the top can be fixed position The fixed end 120 is formed to be bent so as to protrude a predetermined length to the outside.

As shown in FIG. 3, the spring 100 is a member in which a linear metal is wound in a spiral shape to form a constant height and formed in a coil shape, the diameter of which is inserted into a thread formed on an outer surface of the bolt 10. It should be designed to have a proper diameter in consideration of the thread pitch and height of the bolt (10).

The inner diameter of the spring 100 is formed to be smaller than the threaded groove of the bolt 10 so that when the spring 100 is fastened to the thread, the diameter of the spring 100 corresponds to the diameter of the bolt 100. Increase tension.

In addition, the spring 100 is provided with a free end 110 at one end and a fixed end 120 at the other end, the free end 110 is formed to have a relatively larger diameter than the other region nut 20 Contact with the upper surface, and the area except the free end 110 is formed to have a relatively smaller diameter than the free end 110 so as to wrap the thread of the bolt (10) body so that the fixed end 120 at the end To be equipped.

The fixed end 120 protruding a predetermined length out of the spring 100 is inserted into the insertion hole 310 formed in the leaf spring 300 to be described later, so that the spring 100 is wound on the thread of the bolt 10 body. Is fixed so that the free end 110 is in contact with the upper surface of the nut 20 to prevent the nut 20 from loosening from the bolt 10.

This spring 100 may be formed of a compression coil spring or may be formed of a tension coil spring.

When the compression coil spring is formed as illustrated in FIG. 3A, the inner diameter of the spring 100 is fixed to the body of the bolt 10 only by the tension that is opened.

On the other hand, as illustrated in FIG. 3B, when the free end 110 is configured as a compression coil 102 spring and the tension coil 101 spring is gradually moved toward the fixed end 120, the inner diameter is increased. The gap between the pitch of the spring 100 at the tensioned portion as well as the tensioning is widened, and the tension may be generated.

The connecting portion 130 of the region excluding the free end 110 and the free end 110 is bent downwardly in an oblique direction at a predetermined angle so that the free end 110 is spaced a predetermined distance from the region excluding the free end 110. It is effective.

This is the allowable clearance that can be fixed by moving the fixed end 120 in the threaded direction after fastening the spring 100 to the thread of the bolt 10, that is, the fixed end after the spring 100 is fastened to the bolt 10. In the case where it is necessary to turn a little more (120), the free end 110 slightly opens at the lower end, so that a slight tension is generated so that the fixed end 120 can move in the fastening direction.

And, the fixed end 120 of the spring 100 is preferably to be located in the center of any one of the hexagonal surface of the nut 20, which is fixed to the insertion hole 310 of the leaf spring 300 ( 120 is to be easily inserted and fixed.

When holding the fixed end 120 of the spring 100 and rotating in the threaded direction, the spring 100 is not loosened due to the tension applied to the thread of the bolt 10 and is freed. When rotated in the opposite direction of the spring 100 is released.

On the other hand, the cap member 200 is inserted into the outer surface of the nut 10 and the spring 100 so that the nut 20 and the spring 100 is embedded, the outer surface so that the fixed end 120 of the spring 100 is exposed to the outside One side is cut to form an opening surface 210, and a mounting groove 220 is recessed in a lower surface of the opening surface 210.

The cap member 200 is a member formed with an opening on a lower surface thereof and a top portion formed to be bent in a dome shape so that the fixed end 120 is exposed to the outside through an opening surface 210 formed on one side thereof to insert the leaf spring 300. The fixed end 120 to be easily inserted into the ball (310).

The mounting groove 220 provided in the cap member 200 is deeply formed to adjust the depth of insertion of the leaf spring 300 so that the fixed end 120 can be easily inserted into the insertion hole 310. It is effective to be able to cope with errors or gaps that may occur in each product.

The through hole 230 is formed through the upper end of the cap member 200 so that the end of the bolt 10 can pass therethrough, even though the length of the bolt 10 fastened to the fastening object is somewhat longer. Regardless of the length of 10) it is effective to be able to install the cap member 200 in the rear of the nut (20).

And, the lower inner surface of the cap member 200 is formed in a polygonal shape corresponding to the outer surface of the nut 20 so that the cap member 200 is inserted into the outer surface of the nut 20 without play, the cap member 200 is arbitrarily It is desirable not to flow.

The leaf spring 300 has one end inserted into the mounting groove 220 of the cap member 200 and fixed thereto, and an insertion hole 310 is formed to allow the fixed end 120 of the spring 100 to be inserted and fixed to the other end thereof. The plate surface is bent member.

The leaf spring 300 has a multi-stage surface such that the cover member 400 to be described later is pressed into the cap member 200 when the leaf spring 300 is inserted into the mounting groove 220 of the cap member 200. It is preferable to bend to form.

The thickness of the leaf spring 300 is formed to have a thickness similar to the thickness of the mounting groove 220 formed in the cap member 200 so that the flow along the thickness direction when the leaf spring 300 is inserted into the mounting groove 220. It is effective to prevent it from happening.

Meanwhile, in order to insert the leaf spring 300 into the mounting groove 220 of the cap member 200, the leaf spring 300 needs to be lifted a little. It is provided, the cover member 400 is preferably formed by the insert injection method integrated with the leaf spring (300).

One surface of the cover member 400 may be formed by recessed or perforated recognition groove 410 that can measure the position of the fixed end 120 of the spring 100 is inserted.

Recognition groove 410 is preferably provided at a position corresponding to the insertion hole 310 formed in the leaf spring (300).

Referring to Figures 7a to 7c the process of installing a nut loosening prevention device according to the present invention having the configuration as described above is as follows.

First, as shown in FIG. 7A, the bolt 10 is inserted into the fastening hole formed in the installation object, and the nut 20 is disposed along the outer circumferential surface of the body of the bolt 10 protruding to the opposite side through the fastening hole of the installation object. Tighten by tightening torque.

In this state, as shown in FIG. 7B, the spring 100 is fastened to the thread formed in the bolt 10 body and rotated in the threaded direction so that the spring 100 is fastened to the outer surface of the bolt 10 behind the nut 20. Be sure to

Then, the cap member 200 is inserted into the bolt 10 and the nut 20 so that the outer surface of the nut 20 is embedded in the lower surface of the cap member 200, and the opening surface 210 of the cap member 200. The fixed end 110 of the spring 100 is exposed to the outside through the spring 100 is finely adjusted so as to be disposed in a position parallel to any one side of the nut 20.

Thereafter, while inserting the end of the leaf spring 300 integrally formed with the cover member 400 into the mounting groove 210, the leaf spring 300 is slightly opened in the opposite direction to the center of the nut 20 to spring 100. The fixed end 110 is to be inserted into the insertion hole 310 of the leaf spring 300 so that the fixed end 110 is fixed.

6 and 7c, in this state, the spring 100 is fastened to the bolt 10 and restrains itself by tension at a predetermined position. The cap member 200 restrains the nut 20, and the leaf spring 300 rests on the cap member 200 while being fastened to the fixed end 120 after being inserted into the mounting groove 220. ) Cannot rotate in the unwinding direction from the bolt 10 body thread.

Accordingly, the loosening of the nut 20 is prevented even when vibration is applied from the outside, and the nut loosening prevention device according to the present invention is completed as shown in FIG. 8.

As shown in FIG. 8, the nut loosening prevention device according to the present invention is installed in the fixed end 110 of the spring 100 in a state where the end of the leaf spring 300 is inserted into the mounting groove 210. Since the fixing end 110 is fixed by being inserted into the insertion hole 310 of the leaf spring 300, the movement of the spring 100 is constrained, and thus the spring 100 is fixed to the outer surface of the bolt 10. The state in which the nut 20 is fastened to the bolt 10 is maintained firmly because the 20 cannot be rotated in the release direction.

In the method of separating the nut loosening prevention device according to the present invention, in the reverse order of the above-described process, the leaf spring 300 is separated from the cap member 200 and the cap member 200 is removed from the outer surface of the bolt 10 after the spring ( 100 is detached from the outer surface of the bolt (10).

However, when removing the spring 100 from the outer surface of the bolt 10, hold the connecting portion 130 of the spring 100 with a tool such as a finger or a long nose and rotate slightly in the opposite direction while rotating to the opposite direction of the thread 100 is to be separated from the outer surface of the bolt (10).

The nut loosening prevention device according to the present invention can be used for fastening the frame structure of bridges or bridges, soundproof tunnels, soundproof walls with vibrations as well as railway rails.

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

It will be apparent to those skilled in the art that various modifications or variations can be made to the embodiments described above from the description of the invention. In addition, even if not explicitly shown or described, those skilled in the art to which the present invention pertains various forms of modification including the spirit of the present invention from the description of the present invention. Is obvious and still belongs to the scope of the present invention. The above embodiments described with reference to the accompanying drawings are described for the purpose of illustrating the present invention, and the scope of the present invention is not limited to these embodiments.

The present invention can be applied to the construction, civil engineering and mechanical assembly technology for fixing a fixed object.

10: bolt 20: nut
100: spring 110: free end
120: fixed end 130: connection portion
200: cap member 210: opening surface
220: mounting groove 230: through hole
300: leaf spring 310: insertion hole
400: cover member 410: recognition groove

Claims (7)

A spring 100 that rotates along the threads of the bolt 10 body;
A cap member 200 covering the nut 20 and the spring 100; And
Is provided with a leaf spring 300 is fastened to the cap member 200;
The spring 100 has a free end 110 formed at one end and a fixed end 120 bent outward from the other end,
The cap member 200 is formed with an opening surface 210 in which one side of the outer surface is cut to the other side of the portion where the nut 20 and the spring 100 are inserted, and a predetermined depth recessed from the opening surface 210. The mounting groove 220 into which the leaf spring 300 is inserted is formed,
The spring 100 is fastened to the thread of the bolt 10, the cap member 200 is coupled to the nut 20, one side of the leaf spring 300 is fixed to the spring 100 , The other side of the leaf spring 300 is inserted into the mounting groove 220 of the cap member 200, the nut loosening prevention device to prevent the nut 20 is rotated in the release direction.
The method of claim 1,
Nut loosening prevention device to which the cover member 400 is fastened to the leaf spring (300).
The method of claim 1,
The leaf spring 300 has an insertion hole 310 into which the fixed end 120 of the spring 100 is inserted is formed at one side,
Fixed end 120 of the spring 100 is the nut loosening prevention device is inserted into the insertion hole 310 of the leaf spring (300).
The method of claim 3,
After the nut 20 is locked to the bolt 10, the spring 100 is rotated to closely adhere the free end 110 to one surface of the nut 20, and the fixing hole 310 is fixed to the insertion hole 310. Nut loosening prevention device is installed by inserting the end (120).
The method of claim 1,
The plate surface of the leaf spring 300 is bent, the nut loosening prevention device for pressing inward in the state inserted into the mounting groove (220).
The method of claim 1,
Connection portion 130 in the region excluding the free end 110 and the free end 110 is formed by the nut bent inclined downward in a diagonal direction.
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