KR20150010484A

KR20150010484A - Nut for looseness prevention

Info

Publication number: KR20150010484A
Application number: KR20130085584A
Authority: KR
Inventors: 임채우; 이연심
Original assignee: 임채우; 이연심
Priority date: 2013-07-19
Filing date: 2013-07-19
Publication date: 2015-01-28

Abstract

An anti-loose nut is disclosed. A nut that is threadedly engaged with a bolt to penetrate and fix an object to be fastened, comprising: a nut body having a fastening hole formed on an upper portion thereof and a hollow portion having a diameter larger than that of the fastening hole below the fastening hole; A guiding member inserted and fixed in the hollow portion and having a lower inclined guiding hole; The upper part is formed in a conical shape, and a plurality of slits are formed radially from the upper side to the lower side in a radial direction from the upper side to the lower side. Wherein the collet chuck is moved toward the guide member when the fixture presses the collet chuck so that the upper outer circumferential surface of the collet chuck moves toward the guide member, And the upper inner diameter of the bolt passage hole is narrowed by the inclined guide hole so that the bolt inserted in the bolt passage hole is tightened and fixed so as not to rotate.

Description

[0001] NUT FOR LOOSENESS PREVENTION [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a nut to be screwed with a bolt, and more particularly, to a nut having a loosening preventing function to prevent the bolt from being unwound while being screwed.

Generally, bolts and nuts are one of the fastening members widely used in general machinery and construction. Such a bolt-nut fastening member can insert the bolt through the fixture, and then fasten the fixture by screwing the nut to the bolt.

Such a conventional bolt-nut fastening member gradually loosens due to external vibration or impact over time. When bolts and nuts fastened to various parts such as machinery and structures are loosened, There has been a problem in that a problem occurs.

In order to solve this problem, a bolt-nut fastening member having a function of preventing a loosening by inserting a washer between a bolt and a nut has been developed, and a bolt-nut fastening member using such a washer has been improved in various forms.

However, such conventional unlocking bolt nuts often fail to sufficiently prevent loosening when vibration is applied for a long period of time.

To solve these problems, Korean Patent No. 10-1027753, Korean Patent Publication No. 10-2010-0012955, Korean Registered Utility Model No. 20-0241791 discloses a bolt nut having an anti-loosening structure.

However, the conventional bolt nut disclosed in the above can not use a general bolt, and it is troublesome to form a groove in the bolt.

That is, since a specific structure has to be applied to the bolt and the nut in order to exhibit the anti-loosening structure, it takes much time to fabricate and the structure is complicated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an anti-loosening nut which can be fastened using conventional bolts and which has a loosening preventing function and a simple structure.

In order to attain the above object, a lock nut according to the present invention is a nut that is screwed with a bolt to fix an object to be fastened therethrough. The nut includes a fastening hole formed on an upper part of the fastening hole, A nut body having a hollow portion having a diameter; A guiding member inserted and fixed in the hollow portion and having a lower inclined guiding hole; The upper part is formed in a conical shape, and a plurality of slits are formed radially from the upper side to the lower side in a radial direction from the upper side to the lower side. Wherein the collet chuck is moved toward the guide member when the fixture presses the collet chuck so that the upper outer circumferential surface of the collet chuck moves toward the guide member, And the upper inner diameter of the bolt passage hole is narrowed by the inclined guide hole so that the bolt inserted in the bolt passage hole is tightened and fixed so as not to rotate.

Wherein the collet chuck is formed with a sharp-pointed protrusion at an upper inner circumferential surface of the collet chuck to form the bolt passage hole so that when the bolt inserted in the bolt passage hole is tightened by the upper portion of the collet chuck, can do.

The tip projections may be configured to have a triangular cross section.

A first insertion groove is formed in the hollow portion along an inner circumferential surface thereof and a ring-shaped first snap ring having one side cut out is inserted in the first insertion groove, and a part of the first snap ring is protruded to the inner circumferential surface of the hollow portion And the guide member inserted into the hollow portion may be fixedly positioned without being released from the hollow portion.

And a second insertion groove is formed in the hollow portion so as to be spaced apart from the second insertion groove along an inner circumferential surface of the collet chuck at a lower outer circumferential surface of the collet chuck, A part of the second snap ring protrudes from the inner circumferential surface of the hollow part and is located inside the movement restricting groove so as to limit the up and down movement range of the collet chuck.

And a plate spring provided between the guide member and the collet chuck.

According to the present invention, since the nut of the present invention can be fastened by using a normal bolt, the bolt is tightened while the upper portion of the collet chuck is narrowed when the bolt is fastened. It is possible to maintain a more stable engagement state since the engagement is prevented from being released.

In addition, since it is possible to use a normal bolt, there is no need of machining a separate bolt, and there is an effect of shortening a manufacturing time which facilitates manufacture.

1 is an exploded perspective view of an anti-loose nut according to an embodiment of the present invention,
2 is an exploded cross-sectional view of an anti-loose nut according to an embodiment of the present invention,
FIG. 3 is a view for showing a tip protrusion formed on the collet chuck shown in FIG. 1,
FIGS. 4 and 5 are cross-sectional views illustrating an operating state of a release preventing nut according to an embodiment of the present invention. FIG. 4 is a view illustrating a state in which a fixture is fixed to a release preventing nut according to an embodiment of the present invention using a conventional bolt. FIG. 5 is a cross- And the fixed object is fixed.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In this specification, when an element is referred to as being on another element, it may be directly formed on another element, or a third element may be interposed therebetween. Also in the figures, the thickness of the components is exaggerated for an effective description of the technical content.

Embodiments described herein will be described with reference to cross-sectional views and / or plan views that are ideal illustrations of the present invention. In the drawings, the thicknesses of the films and regions are exaggerated for an effective description of the technical content. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are produced according to the manufacturing process. For example, the etched area shown at right angles may be rounded or may have a shape with a certain curvature. Thus, the regions illustrated in the figures have attributes, and the shapes of the regions illustrated in the figures are intended to illustrate specific forms of regions of the elements and are not intended to limit the scope of the invention. Although the terms first, second, etc. have been used in various embodiments of the present disclosure to describe various components, these components should not be limited by these terms. These terms have only been used to distinguish one component from another. The embodiments described and exemplified herein also include their complementary embodiments.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms "comprises" and / or "comprising" used in the specification do not exclude the presence or addition of one or more other elements.

Hereinafter, the present invention will be described in detail with reference to the drawings. In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, it will be appreciated by those skilled in the art that the present invention may be understood by those skilled in the art without departing from such specific details. In some instances, it should be noted that portions of the invention that are not commonly known in the description of the invention and are not significantly related to the invention do not describe confusing reasons to explain the present invention.

Hereinafter, an anti-loose nut according to an embodiment of the present invention will be described with reference to the drawings.

1 to 3, the release preventing nut 100 of the present invention includes a nut body 110, a guide member 120, a first retaining ring 130, a collet chuck 140, a leaf spring 150, And a second snap ring (160).

The nut body 110 is formed in a cylindrical shape having a central through hole and an open top and a bottom. The nut body 110 has a fastening hole 111 formed with a female thread 111a up to a predetermined height from the top of the fastening hole, 111), a hollow portion 112 having a diameter larger than that of the fastening hole 111 is formed. A first insertion groove 112a is formed at an intermediate height of the hollow portion 112 along the inner circumferential surface, and a second insertion groove 112b is formed at an inner circumferential surface of the lower end portion. That is, the first insertion groove 112a and the second insertion groove 112b are formed in the hollow portion 112 so as to be spaced apart from each other by a predetermined distance in the vertical direction.

The guide member 120 is formed in a cylindrical shape so as to be inserted into the hollow portion 112, and a tilted guide hole 122 having a shape of a lowered wedge shape is formed at the center. The guide member 120 is inserted into an upper portion of the hollow portion 112 to be fixed in position.

The first snap ring 130 is formed in a partly cut ring shape and is fitted in the first insertion groove 112a. In this case, when the guide member 120 is inserted into the hollow portion 112 and the first snap ring 130 is inserted into the first insertion groove 112a, an inner part of the first snap ring 130 is inserted into the hollow portion 112, So that the guide member 120 does not fall down below the hollow portion 112. That is, by the first snap ring 130, the guide member 120 is fixed to the upper portion of the hollow portion 112.

The collet chuck 140 is formed in a cylindrical shape and is inserted into the hollow portion 112 to be vertically movable. The lower end of the collet chuck 140 is slightly protruded relative to the lower end of the bolt body 110. The collet chuck 140 is vertically formed to have a bolt passage hole 142. An upper portion of the collet chuck 140 is formed in a conical shape, 144 are formed, and a plurality of slits 144 are formed radially with respect to the upper center of the chuck chuck 140. [

The bolt passage hole 142 of the collet chuck 140 is formed to be slightly larger than the diameter of the bolt body 11 (see FIG. 4) to be screwed into the fastening hole 111, so that the bolt body 11 is inserted into the bolt through- 142 to be screwed into the fastening hole 111. As shown in Fig.

A movement restricting groove 141a is formed along the outer circumferential surface of the lower outer circumferential surface of the collet chuck 140. The movement restricting groove 141a has a predetermined length up and down.

A plurality of sharp protrusions 146 having sharp ends are formed on the inner peripheral surface of the upper portion 143 of the collet chuck 140. As shown in Fig. 3, these tip projections 146 are formed in a right triangle shape. The tip protrusion 142 has a vertical surface 146a perpendicular to the tangential direction of the inner circumferential surface of the bolt passage hole 142 and an inclined surface 146b connected to the bolt through hole 142 from the end of the vertical surface 146a .

The leaf spring 150 is formed in a circular ring shape, and its cross section is formed to be inclined at a predetermined angle. 4, the leaf spring 150 is interposed between the guide member 120 and the collet chuck 140 so as to push the collet chuck 140 downward relative to the guide member 120, To generate an elastic force.

The second snap ring 150 is formed in a partially ring-like shape like the first snap ring 130, and is fitted in the second insertion groove 112b. When the second snap ring 160 is inserted into the second insertion groove 112b, an inner part of the second snap ring 160 protrudes into the hollow part 112 and is positioned inside the movement restricting groove 141a.

Therefore, the collet chuck 140 can move up and down within the hollow portion 112 only by the upper and lower lengths of the movement restricting groove 141a. That is, when the collet chuck 140 is moved downward, the second retaining ring 160 is caught on the upper end of the movement restricting groove 141a so that the collet first 140 does not descend further downward, Direction.

4, when the nut 100 of the present invention is not screwed to the bolt 10, the plate spring 150 is not deformed in its original state. At this time, the lower end of the collet chuck 140 is fixed to the nut body The collet chuck 140 and the guide member 120 are spaced apart from each other by a predetermined distance from the lower end of the collet chuck 140 and the inclined upper portion 143 of the collet chuck 140, The inclined guide holes 122 of the member 120 are spaced apart from each other by a predetermined distance.

Hereinafter, the use of the release preventing nut 10 according to the embodiment of the present invention will be described with reference to FIGS. 4 and 5. FIG.

The user passes the bolt body 11 of the ordinary bolt 10 through the bolts through holes 142 of the collet chuck 140 after passing the bolts p1 and p2 through the bolts body 11 of the bolt 10, Tighten the screws.

In this case, the male thread 11a of the bolt body 11 is fastened to the female thread 111a of the fastening hole 111. At this time, the bolt head 12 and the nut body 110 come close to each other, the inner diameter of the upper portion 143 of the collet chuck 140, that is, the upper diameter of the bolt passage hole 142, is smaller than the outer diameter of the bolt body 11 until the collet chuck 140 is pushed toward the guide member 120 The bolt body 11 can be easily rotated in the direction of fastening to the fastening hole 111. As shown in Fig.

On the other hand, when the fixtures p1 and p2 push the lower end of the collet chuck 140, the collet chuck 140 moves upward toward the guide member 120 and the slit 143 is formed The upper portion 143 of the collet chuck 140 is brought into contact with the inclined guide hole 122 and then the upper portion 143 of the collet chuck 140 having the slit 144 formed therein is pushed down by the inclined guide hole 122 The bolt head 11 inserted into the bolt passage hole 142 is tightened and fixed so that the bolt 10 is not rotatable and the bolt head 11 The bolt 10 is prevented from being released from the nut 100 by external vibration or impact in a state where the bolt 10 is pressed and fixed by the upper portion 143 of the collet chuck 140. [

Particularly, when the upper portion 143 of the collet chuck 140 is pinched and the bolt body 11 inserted in the bolt passage hole 142 is pressed and tightened, the tip protrusion 146 presses the bolt body 11 The tip end of the bolt body 11 is in a state of being infiltrated by the scratching of the bolt body 11 and eventually the fastening of the bolt 10 and the nut 100 is completed, , The nut 100 is never released from the bolt 10 due to external vibration or impact.

As described above, the nut 100 according to the present invention can be fastened using a conventional general bolt 10, and when the bolt 10 is fastened, the upper portion 143 of the collet chuck 140 is narrowed, Since the tip protrusion 146 is fixed to the bolt body 11 so as not to be rotated, it is possible to prevent the bolt body 11 from being unfastened by external vibration after the fastening .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that many changes and modifications of the present invention can be made without departing from the spirit and scope of the appended claims. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

110 ... nut body
111 ... fasteners
111a ... female threads
120 ... guide member
122 ... inclined guide ball
130 ... 1st snap ring
140 ... Collet Chuck
141a ... Restricted movement
142 ... bolt through ball
144 ... slit
150 ... leaf spring
160 ... 2nd snap ring

Claims

A nut screwed into a bolt to penetrate and fix the fixture,
A nut body having a fastening hole formed on an upper portion thereof and a hollow portion having a diameter larger than that of the fastening hole below the fastening hole;
A guiding member inserted and fixed in the hollow portion and having a lower inclined guiding hole;
The upper part is formed in a conical shape, and a plurality of slits are formed radially from the upper side to the lower side in a radial direction from the upper side to the lower side. And a formed collet chuck,
The collet chuck is moved toward the guide member so that the upper outer circumferential surface of the collet chuck is pressed against the inclined guide hole and the bolt is screwed to the bolt, And the bolt inserted in the bolt passage hole is fastened so as not to rotate so that the upper inner diameter of the through hole becomes narrow.

The method according to claim 1,
The collet chuck forming the bolt passage hole has an upper end surface formed with a sharp projection having a sharp tip so that when the upper portion of the collet chuck tightens the bolt inserted in the bolt passage hole, Features an anti-loosening nut.

3. The method of claim 2,
Wherein the tip protrusions are formed in a triangle-shaped cross section.

The method according to claim 1,
The hollow portion has a first insertion groove formed along an inner circumferential surface thereof,
Wherein a ring-shaped first snap ring having one side cut out is inserted into the first insertion groove, and a part of the first snap ring protrudes from the inner circumferential surface of the hollow part, and the guide member inserted into the hollow part And the position is fixed without being pulled out.

5. The method of claim 4,
A movement restricting groove is formed on a lower outer circumferential surface of the collet chuck,
A second insertion groove is formed in the hollow portion so as to be spaced apart from the second insertion groove along an inner circumferential surface thereof,
Wherein a part of the second snap ring protrudes from the inner circumferential surface of the hollow part and is located inside the movement restricting groove to move the collet chuck up and down Wherein the range is limited.

6. The method of claim 5,
And a leaf spring installed between the guide member and the collet chuck.