JPH0972327A - Nonloosening nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a nut to bear up against vibration and shock for making its reutilization possible by facilitating the expansion and contraction or shortening in diameter of the upper part of a nut body, and providing a plurality of slits at the upper end or in a lower part of the nut, and in the case of attaching the nut to a bolt, sliding an armor body from an upside toward a downside to tightly press the nut body. SOLUTION: A nut main body 1 is inserted from the end of a bolt X in a state that the upper end side of the slit 5 of a nut body 2 is expansively opened centering around the connecting part 3a of a prismatic pedestal 3. Next an armor body 11 is inserted and armored on the nut body 2 and slid downward along the oblique periphery of the nut body 2, and when the pedestal 3 is screwed in the bolt X, torque acts downward in the axial direction of the bolt X. When the nonsliding face 23 of the armor body 11 is further pressed in along the nonsliding face 22 of the nut body 2 to tightly fit the armor body 11 in the nut body 2, the nonsliding faces 22, 23 overlap mutually to tightly press the nut main body 1 to the bolt X, and torque in the reverse radial direction toward the axis of the bolt X therefore acts. Thus rotation and reverse sliding are impossible and the nut does never loosen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-loosening nut, and more specifically, when the nut is mounted on a bolt, it can be mounted without screwing it into a desired position of the bolt, and it is possible to prevent continuous or intermittent vibration or impact. The present invention relates to a non-loosable nut that cannot be loosened even when received and can be detached and reused.

[0002]

2. Description of the Related Art Conventionally, there has been a double type locking nut as shown in FIG. The double-type anti-loosening nut is for mounting on a bolt X (not shown), and is composed of a nut body Y and an exterior body Z. The nut body Y is composed of a nut body Y1 made of a trapezoidal cone and a prismatic pedestal Y2 formed at the bottom of the nut body Y1, and a thread groove Y3 is formed on the outer periphery of the nut body Y1. Along with being engraved, a plurality of slits Y4 are formed downward from the upper end only on the nut body Y1. Further, a hollow portion Y5 that penetrates the nut body Y is formed at the center of the nut body Y, and a screw groove Y6 is formed in the hollow portion Y5. The outer casing Z has a hollow portion Z1 slidable along the inclined outer periphery of the nut body Y1.
Had a thread groove Z2 that meshes with the thread groove Y3 on the outer periphery of the. The nut body Y in which the nut body Y of the double-type anti-loosening nut configured as described above is screwed on from the end of the bolt X, and the exterior body Z separately inserted from the end of the bolt X is screwed onto the bolt X. When it is screwed onto the nut body Y1, the diameter of the upper end portion of the nut body Y1 is reduced due to the plurality of slits Y4 formed in the nut body Y1. Only the upper end portion of the nut body Y1 of the nut body Y1 is strongly pressed.

[0003]

However, although the conventional double-type anti-loosening nut has an effect that it is harder to loosen than a general nut, the double-type anti-loosening nut is continuous.
When subjected to intermittent vibration or shock, only the upper part of the nut body is tightly pressed by the bolt, so the tightness of the nut body against the bolt is insufficient, the outer body screwed to the nut body loosens, and The nut body tightened by the bolt loosens,
As a result, the double-type anti-loosening nut is loosened, which causes various problems. Further, with the improvement of the technology, the harmful effects caused by the looseness of the screws have become apparent, and at times, the harmful effects of causing a personal injury have occurred. Under these circumstances, there is an urgent need to develop nuts that cannot be loosened once they are fastened or attached, rather than preventing loosening.

The present invention can withstand continuous / intermittent vibrations and shocks, completely prevent loosening, can be directly mounted on a desired position of the bolt without being screwed into the bolt, and can be removed and reused. Further, another object of the present invention is to provide a non-loosening nut that can be securely attached so as not to loosen by crimping a part of the nut to the bolt to prevent loosening and can be reused by removing it.

[0005]

In order to achieve the above-mentioned object, the invention according to claim 1 is a nut body formed in a trapezoidal cone for attaching to a bolt, and the nut body. And a nut body having a prismatic pedestal formed in the lower part of the nut, and a hollow portion penetrating the center of the nut body and the prismatic pedestal, and an inclined outer periphery of the nut body formed in the nut body attached to the bolt. A double type loosening prevention nut consisting of an exterior body having a hollow part slidable along the upper part of the nut body, or the upper part of the nut body can be reduced in diameter and When the nut body is attached to the bolt, it has a plurality of slits formed continuously from the upper end of the nut body downward to the nut body and polygonal column pedestal so that the side part of the body can be opened and closed. , Made of trapezoidal cones Along the outer periphery of the nut body downward to the exterior body from above, characterized in that to 緊圧 the nut body to the bolt by sliding.

According to a second aspect of the present invention, in the non-loosening nut according to the first aspect, the outer body is slid downward from above along the outer periphery of the nut body formed on the nut body mounted on the bolt. In order to prevent reverse movement, at least a part of the outer periphery of the nut body and the outer casing contacting a part of the outer periphery of the nut body when the outer casing is slid from the upper side to the lower side along the outer periphery of the nut body. Outer sheath along the outer circumference of the nut body, which has a reverse motion prevention member formed in one or both of a part of the hollow part of the body, and which is a trapezoidal cone of the nut body attached to the bolt. After sliding the body from the upper side to the lower side, the nut body is tightly pressed against the bolt by press-fitting the outer body to the outer periphery of the nut body.

According to a third aspect of the invention, in the non-loosening nut according to the second aspect, the reverse motion preventing member is formed by a screw groove and is screwed to the screw groove formed on the outer periphery of the nut body. The thread groove formed in the hollow part of the nut body is formed by a thread groove with a pitch slightly different from the thread groove on the outer periphery of the nut body or a thread groove with a slightly different shape, and the trapezoidal cone of the nut body mounted on the bolt After sliding the outer body from the upper side to the lower side along the outer circumference of the nut body consisting of, the nut body is screwed onto the outer circumference of the nut body and the hollow groove of the outer body to attach the nut body to the bolt. Characterized by applying a tight pressure.

According to a fourth aspect of the invention, in the non-loosening nut according to the second aspect, the reverse movement preventing member is formed of a non-smooth surface.

According to a fifth aspect of the present invention, in the non-loosening nut according to the second aspect, the reverse movement preventing member is formed of a magnetic material, and either one of the outer periphery of the nut body and a part of the hollow portion of the exterior body is provided. When only one is a magnetic body, the other of the outer periphery of the nut body and a part of the hollow portion of the exterior body is formed of a magnetic body.

According to a sixth aspect of the present invention, in the non-loosening nut according to the second aspect, the reverse movement preventing member is formed of an elastic body made of a polymer compound such as rubber or synthetic resin. .

According to a seventh aspect of the invention, in the non-loostable nut according to one of the first to sixth aspects, at least a part of the thread groove in the hollow portion of the nut body is slightly different from the thread groove on the outer circumference of the bolt. The second reverse movement preventing member is formed of a thread groove having a pitch or a shape.

According to an eighth aspect of the present invention, in the non-loostable nut according to one of the first to seventh aspects, when the nut body is attached to the bolt, the nut body having an upper portion expanded is attached to the end portion of the bolt. For easy insertion from the bottom, an annular notch is formed on the outer periphery of the lower end of the hollow portion of the nut body.

According to a ninth aspect of the present invention, in the non-loostable nut according to one of the first to eighth aspects, when the nut body is tightly pressed against the bolt, a part of the hollow portion of the nut body is bolted. Since the outer periphery of the nut is crimped, a protrusion in the reverse radial direction toward the center line of the hollow portion is formed in a part of the hollow portion of the nut body.

According to a tenth aspect of the present invention, in the non-loosening nut according to the ninth aspect, when the nut body is tightly pressed against the bolt, the projection in the reverse radial direction formed in the hollow portion of the nut body is secured to the bolt. In order to crimp into the hollow body of the nut body, the slanted inner wall surface of the hollow portion of the outer body that comes into contact with the outer periphery of the hollow portion that forms the projection in the reverse radial direction of the nut body It is characterized in that it is formed as an inner wall surface inclined at an obtuse angle with respect to the center line.

The invention described in claim 11 is according to any one of claims 1 to 1.
In the non-loostable nut described in 1 of 0, the nut main body that is pressed against the bolt is fixed, so that a part of the lower end surface abuts the upper end of the exterior body and the inner surface meshes with the thread groove of the bolt. It is characterized by having a retaining ring.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

<Embodiment 1 of Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 is an exploded perspective view of a non-loosening nut according to the present invention, FIG. 2 is a vertical cross-sectional view taken along the line AA of FIG. 1 (showing a nut body), and FIG. 3 is a non-loosening nut according to the present invention. FIG. 4 is an enlarged exploded vertical cross-sectional view showing a state before the exterior body is externally attached to the nut body attached to the bolt, and FIG. 4 is an enlarged vertical cross-sectional view showing a state in which the non-loosening nut according to the present invention is fastened to the bolt. It will be described with reference to FIGS. The non-loosening nut of the present invention shown in the first embodiment is a bolt X.
A nut body 1 mounted on the nut body 2, a plurality of slits 5 and 5 continuously formed in a nut body 2 and a prismatic pedestal 3 which form the nut body 1, and an exterior body 1 exteriorly mounted on the nut body 2.
1 and the nut body 2 of the nut body 1 attached to the bolt X
A reverse movement preventing member 21 for preventing a reverse movement (including the meaning of both rotation and reverse sliding) of the exterior body 11 that is exteriorly mounted on the exterior body 11;
After the exterior body 11 is exteriorly mounted on the nut body 2 of the nut body 1 attached to the bolt X, the exterior body 11 is slid from the upper side to the lower side along the outer periphery of the nut body 2, and the nut body 1 is pressed against the bolt X. And a retaining ring 31 made of a spring material for preventing the outer casing 11 from moving backward.
The nut body 1 is for mounting on the bolt X, and forms a nut body 2 (a trapezoidal cone in the figure) formed of a trapezoidal cone having an inclined outer periphery at one end,
At the other end, that is, at the lower part of the nut body 2, a prismatic pedestal 3 (in the drawing, a hexagonal pedestal is shown, but if it is a polygonal pedestal, any shape may be used regardless of what is shown).
Is formed. At the center of the nut body 1 composed of the nut body 2 and the prismatic pedestal 3, a hollow portion 4 having a thread groove 4a that meshes with the thread groove formed in the bolt X is formed. From one end of the bolt X to the nut body 1
To tighten the nut body 1 against the bolt X, the plurality of slits 5, which are continuous with the nut body 2 and the prismatic pedestal 3, are directed from the upper end of the nut body 2 toward the lower end of the prismatic pedestal 3.
By forming 5, the upper end side of the nut body 2 can be expanded and reduced in diameter. At this time, a part of the lower end of the prismatic pedestal 3 is left as the connecting portion 3a. When the nut body 1 is attached to the bolt X, the outer casing 11 forms a hollow portion 12 that is slidable along the inclined outer peripheral surface of the nut body 2, and is attached to the bolt X on the outer periphery of the outer casing 11. The protrusion 13 that serves as a locking part when removing the loosened nut (indicated by a collar-shaped projection in the figure, but if it is a locking part for locking a jig or the like and removing the exterior body 11, (Regardless of its shape). The reverse movement preventing member 21 for preventing the backward movement of the outer casing 11 that is sheathed on the nut body 2 is provided at a connecting portion between the nut body 2 and the prismatic pedestal 3, that is, at a part of the outer peripheral surface of the other end of the nut body 2. The non-smooth surface 22 formed as a non-smooth surface and the outer body 11 that is mounted on the nut body 2 of the nut body 1 mounted on the bolt X are slid from the upper side to the lower side along the outer peripheral surface of the nut body 2. In this case, the non-smooth surface 23 is formed by forming a part of the inner wall surface of the hollow portion 12 of the exterior body 11 that comes into contact with the non-smooth surface 22 as a non-smooth surface. The non-smooth surfaces 22 and 23 are preferably rough surfaces having a large frictional resistance and slipping, such as a surface of a file. It should be noted that either one of the non-smooth surface 22 of the nut body 2 and the non-smooth surface 23 of the exterior body 11 may be formed as a non-smooth surface, that is, a rough surface which is not smooth. The non-smooth surfaces 22 and 23 can also be formed as surfaces parallel to the axis passing through the center of the nut body 2 as shown in the drawing. The retaining ring 31 made of a spring material is for fixing a non-loosable nut that is made by pressing the nut body 1 against the bolt X, and the inner surface of the retaining ring 31 made of a spring material is the thread groove X1 of the bolt X. While engaging with the snap ring 31
Is attached to the bolt X such that the lower end surface of the abutment is in contact with one end surface of the exterior body 11 of the non-loosening nut attached to the bolt X. The retaining ring 31 made of this spring material is E-shaped or C for shaft.
It is made up of retaining rings such as shapes.

The non-loosening nut having the above-mentioned structure has a connecting portion 3a (having a biasing force because the slit 5 is deeply formed) formed at the other end of the prismatic pedestal 3 of the nut main body 1. Then, one end of the nut body 1, that is, the upper end side of the nut body 2 is expanded and inserted from the end of the bolt X (it is easy to insert if the diameter of the hollow portion 4 is slightly larger than the diameter of the bolt X). Next, from the end portion of the bolt X, the exterior body 1
1 is inserted and the outer body 11 is mounted on the nut body 2 of the nut body 1 attached to the bolt X, and the outer body 11 is slid along the inclined outer periphery of the nut body 2 from above to below. Then, when the prismatic pedestal 3 is screwed into the bolt X, torque acts downward in the axial direction of the bolt X. Furthermore, when the non-smooth surface 23 of the exterior body 11 is press-fitted from the upper side to the lower side along the non-smooth surface 22 of the nut body 2 to tightly fit the exterior body 11 to the nut body 2, The smooth surface 22 and the non-smooth surface 23 of the outer casing 11 are overlapped, the nut body 1 is pressed against the bolt X, and a torque in the reverse radial direction toward the axial direction of the bolt X acts. In this way, the non-loosening nut mounted on the bolt X is the non-slip surface 22 on the outer peripheral surface of the nut body 2.
And the non-smooth surface 23 of the hollow portion 12 of the exterior body 11 are in close contact with each other,
The exterior body 11 cannot be reversely moved from the nut body 2. That is, since the non-smooth surface 22 of the nut body 2 and the non-smooth surface 23 of the outer body 11 are pressed against each other in the exterior body 11, they do not slide with each other, so that neither rotation nor reverse sliding is possible, and slack The immovable nut cannot be loosened, and the inner surface of the retaining ring 31 made of a spring material meshes with the thread groove of the bolt X and contacts the upper end surface of the exterior body 11 of the immovable nut mounted on the bolt X. Since it is attached to the bolt X, it cannot be loosened unless the non-loosening nut is destroyed. In this way, the connecting portion 3a at the lower end of the nut body 1 pressed by the bolt X
Has a biasing force, the connecting portion 3a is housed in the bending slits 5 and 5 when the bolt X is pressed tightly. Therefore, the entire screw groove 4a of the hollow portion 4 of the nut body 1 is fixed to the bolt X. Engages with the thread groove to increase the fastening force. When removing the non-loosening nut from the bolt X, first, the retaining ring 31 made of a spring material is removed, and the jig is locked to the projection 13 formed on the exterior body 11, and the exterior body 11 is trapezoidal cone 2 Remove it by sliding backwards from the bottom to the top along the outer peripheral surface of
It is recommended to remove the nut body 1 from the bolt X.

Further, the reverse movement preventing member 21 is provided with at least a part of the outer peripheral surface of the nut body 2 and the outer body 11 which is mounted on the nut body 2 of the nut body 1 mounted on the bolt X. Any of the inner wall surface of the hollow portion 12 of the outer casing 11 that abuts on at least a part of the wall surface of the nut body 2 when sliding downward from above along the inclined outer peripheral surface of 2 and further press-fitting. If one or both of the surfaces is made of an elastic body made of a polymer compound such as rubber or synthetic resin, the same function and effect as those of the above embodiment can be obtained. Further, the reverse movement prevention member 21 is provided on at least a part of the outer peripheral surface of the nut body 2, and the exterior body 11 exteriorly mounted on the nut body 2 of the nut body 1 attached to the bolt X. Any one of the inner wall surface of the hollow portion 12 of the outer casing 11 that abuts on at least a part of the wall surface of the nut body 2 when sliding it from the upper side to the lower side along the inclined outer peripheral surface and further press-fitting it. Are both wall surfaces made of a magnetic material, and at least one of the outer surface of the nut body 2 and the inner surface of the hollow portion 12 of the outer body 11 contacting the part is magnetic. When the wall surface is formed of a body, the same effect can be obtained by making the other surface a surface formed of a magnetic body. The reverse movement preventing member 2 having the above-mentioned configuration
By setting it to 1 (not shown), the same working effect as that of the non-loostable nut described in <Embodiment 1> can be obtained.

<Embodiment 2 of Embodiment> FIG. 5 is a longitudinal sectional view of a nut body of a non-loosable nut according to the present invention, and FIG.
3 is a cross-sectional view taken along line AA of FIG. Modes of different embodiments of the present invention shown in FIGS. 5 and 6 will be described. In the following description of the embodiment, the same components as those of the embodiment of the present invention described above will be designated by the same reference numerals and redundant description will be omitted. A description will be given based on FIGS. 5 and 6. The main difference from the embodiment of the present invention is that the connecting portion 3a at the lower end of the prismatic pedestal 3 shown in <Embodiment 1> is provided with the prismatic pedestal 3
That is, the connecting portion 3b is formed on one side. With the nut body 1 having such a configuration, the other side of the prismatic pedestal 3 can be expanded together with the nut body 2, and the nut body 1 can be directly clamped from the side portion of the bolt X to a desired position.
Usability is improved.

<Embodiment 3> FIG. 7 is an exploded perspective view of a nut body of a non-loosable nut according to the present invention, and FIG. 8 is an exterior body attached to a nut body of a non-loosable nut according to the present invention. FIG. 3 is an enlarged exploded vertical cross-sectional view showing a state before the exterior is covered. A description will be given based on FIGS. 7 and 8. The main difference from the embodiment of the present invention is that the reverse motion preventing member 21 described in <Embodiment 1> is a reverse motion preventing member 24 including a screw groove.
It was that. That is, the reverse motion preventing member 24 for preventing the reverse motion of the exterior body 11 exteriorly mounted on the nut body 2 of the nut body 1 is the connecting portion between the nut body 2 and the polygonal columnar pedestal 3, that is, the other end of the nut body 2. A thread groove 25 formed on the outer periphery,
When the exterior body 11 exteriorly mounted on the nut body 2 of the nut body 1 attached to the bolt X is slid downward from above along the outer peripheral surface of the nut body 2, it is formed in the hollow portion 12 of the exterior body 11. It is composed of the screw groove 25 and a screw groove 26 that can be screwed. The thread groove 26 has a slightly different pitch from the thread groove 25 and can be screwed into the thread groove 25. However, due to the difference in pitch, the deeper the thread is, the harder it is to screw in and the more difficult it is to loosen. The thread groove 25 and the thread groove 26 have the same pitch and the same shape, and one end of the thread groove 26 (the end of the thread groove) has a thread shape slightly different from the thread groove 25 (the thread groove has a small end portion). It is also possible to make it difficult to screw in and loosen by providing a protrusion or deforming a screw thread. That is, the thread groove 26 may have any shape regardless of the illustrated shape as long as the thread groove is slightly different from the thread groove 25 so that it is difficult to screw in and loosen if it is screwed deeply.

<Fourth Embodiment> FIG. 9 is a sectional view taken along line CC of FIG.
FIG. 4 is a line cross-sectional view (however, the pitch of some screw grooves and the position of the connecting portion are different). This will be described with reference to FIG. The main difference from the embodiment of the present invention is <Form 1 of embodiment>
The connecting portion 3a described in 1. is formed on the side end portion of the pedestal 3 instead of the lower end portion, and a part of the thread groove 4a on the inner wall surface of the hollow portion 4 of the nut body 1 has a pitch slightly different from the pitch of the thread groove 4a. That is, the thread groove 4b (upper end portion in the figure) is used. That is, the thread groove 4a on the inner wall surface of the hollow portion 4 of the nut body 1
That is, at least a part of them is a thread groove 4b having a pitch slightly different from the thread groove of the bolt X. The thread groove 4b is a second reverse movement preventing member. Since it is a non-loosening nut having the nut body 1 having such a configuration, the other end of the nut body 1 is expanded and sandwiched at a desired position directly from the side surface of the bolt X, and the nut body 1 is attached to the bolt X. When mounted, the thread groove of the nut body 1 has the thread grooves 4a and 4b having a plurality of pitches in contrast to the thread groove of the bolt X having a uniform pitch. Since the contact angle with respect to the groove is different, the nut cannot be loosened, which enhances the effect of the non-loosening nut. The thread groove 4b having a pitch slightly different from the pitch of the thread groove 4a has a slightly different shape from the thread groove 4a regardless of the thread groove 4b having a different pitch, for example, a small protrusion is formed at the tail end of the thread groove 4a. The same effect can be obtained by providing or changing the thickness of the thread groove (<Form 3 of the embodiment).
>).

<Fifth Embodiment> FIG. 10 is a vertical sectional view of a nut body of a non-loosening nut according to the present invention. FIG.
0 will be described. The main difference from the embodiment of the present invention is that when the nut body 1 is attached to the bolt X, it is easy to insert the nut body 1 with one end widened from the end of the bolt X, so that the nut body 1 is hollow. The annular notch 6 is formed on the outer periphery of the other end of the portion 4 (formed on the lower end in the figure). Since it is a non-loostable nut having the nut body 1 having such a configuration, when the nut body 1 is inserted from the end of the bolt X, the diameter of the other end of the hollow portion 4 expands when the upper end of the nut body 1 is expanded. The nut body 1 can be easily inserted from the end of the bolt X. As described in <Embodiment 4>, the thread groove 4 on the inner wall of the hollow portion 4 of the nut body 1 is formed.
A part (a one end side in the figure) of a may be a thread groove 4b having a pitch slightly different from the pitch of the thread groove 4a.

<Embodiment 6> FIG. 11 is a vertical sectional view of a nut body of a non-loosable nut according to the present invention. FIG.
It will be described based on 1. The main difference from the embodiment of the present invention is that when the nut body 1 is pressed against the bolt X,
Since the outer circumference of the bolt X is crimped by a part of the nut body 1, a part of the hollow portion 4 of the nut body 1 (provided at the upper end in the figure) faces the center line of the hollow portion 4 (one or more). Providing a projection 7 in the reverse radial direction (a projection having an arc-shaped cross section in the figure) is provided. In order to securely crimp the projection 7 in the reverse radial direction on the outer periphery of the bolt X, the pitch of the thread groove 25 formed on the outer peripheral surface of the other end of the nut body 2 as the reverse movement preventing member 24 is set to the screw of the bolt X. It is desirable to set the pitch to half the pitch of the groove, and if the pitch of the thread groove 25 is small, the nut body 1 mounted on the bolt X is easily and surely mounted against the resistance when the exterior body 11 is screwed. As a result, the projection 7 in the reverse radial direction can be securely swaged on the outer circumference of the bolt X.

<Embodiment 7> FIG. 12 is an enlarged exploded vertical sectional view showing a state before the outer body is mounted on the nut body mounted on the bolt of the non-loosening nut according to the present invention.
FIG. 4 is an enlarged vertical cross-sectional view showing a state in which a non-loosening nut according to the present invention is fastened to a bolt. This will be described with reference to FIG. The main difference from the embodiment of the present invention is that the following configuration is performed in addition to the description of <Embodiment 6>. That is, when the nut main body 1 is pressed against the bolt X, the projection 7 in the reverse radial direction of the nut main body 1 is securely crimped to the bolt X, so that the inner wall surface of the hollow portion 12 of the outer casing 11 is inclined. , Nut body 1 with projections 7 in the reverse radial direction
The inclined inner wall surface 14 of the hollow portion 12 of the outer casing 11 that contacts the outer peripheral surface of the outer wall surface of the outer casing 11
The inner wall surface 15 (exterior body 11) that is inclined at an obtuse angle with respect to the center line of the
Is a protruding wall surface that protrudes in the opposite radial direction toward the center line of the hollow portion 12). Since the exterior body 11 has such a configuration, when the nut body 1 is sufficiently pressed against the bolt X, the obtusely inclined inner wall surface 15 of the exterior body 11 causes the hollow portion 4 of the nut body 1 to move. The protrusion 7 in the reverse radial direction at one end of the inner wall surface is pressed in the reverse radial direction toward the center line of the hollow portion 4 and is reliably crimped to the outer circumference of the bolt X.

[0025]

EXAMPLES The material of the non-loosening nut according to the present invention is generally made of metal, but it may be made of synthetic resin, particularly synthetic resin having high hardness and fracture resistance.

[0026]

As described above, the invention according to claim 1 of the present invention does not provide a plurality of slits only in the nut body as in the conventional double type loosening prevention nut, but rather in the nut body. Since a plurality of continuous slits are provided in the nut body and the outer body from the upper end toward the outer body, the upper portion of the nut body can be expanded and the nut body can be easily inserted from one end of the bolt, or By expanding the lateral portion of the nut body, a non-loosable nut that can be directly mounted from the lateral side of the bolt to a desired position was obtained. In addition, compared with the conventional double locking nut, multiple slits are provided continuously in the nut body and the outer body, so when the nut body mounted on the bolt is tightened against the bolt, the nut Since the tightening portion of the screw groove of the main body and the bolt is large and the connecting portion is accommodated in the bending slit, the meshing portion of the screw groove of the nut main body and the bolt becomes large, and the tightening force of the nut main body to the bolt or A non-loosening nut having a large screwing force was obtained. Therefore, compared with the conventional double type loosening prevention nut, it has high durability against continuous and intermittent vibrations and shocks, and it can be loosened unless it is damaged, and it can be detached and reused. .

In addition to the effect of the invention as set forth in claim 1, the invention as set forth in claim 2 prevents reverse movement of either or both of the outer peripheral surface of the trapezoidal cone and the inner wall surface of the hollow portion of the outer package. Since the member is formed, it is packaged on the nut body of the nut body mounted on the bolt, and after sliding down from above along the inclined outer periphery of the nut body, the package body press-fitted into the nut body is Since the reverse movement prevention member cannot reverse slide or rotate,
Even when subjected to continuous and intermittent vibrations and shocks, it was not possible to reverse or reverse slide or rotate, and it could not be loosened, and a non-loosening nut that could be removed and reused was obtained.

According to a third aspect of the present invention, in addition to the effect of the first aspect of the invention, the reverse movement preventing member is formed by a screw groove, and the screw groove is formed on the outer peripheral surface of the trapezoidal cone. And the thread groove formed on the inner wall surface of the hollow portion of the exterior body.The former and the latter thread grooves are formed as thread grooves having a slightly different pitch from each other or as thread grooves having a slightly different shape. , These screw grooves are forcibly screwed and meshed strongly, and they cannot move backward, so they are mounted on the nut body of the nut body mounted on the bolt, and slide from the upper side to the lower side along the inclined outer periphery of the nut body. After that, the outer body forcibly screwed to the nut body was not able to perform reverse movement, that is, reverse sliding or rotation, and the same effect as in claim 2 was obtained.

According to the invention of claim 4, in addition to the effect of the invention of claim 1, since the reverse movement preventing member is formed by a non-smooth non-smooth surface, the nut body of the nut body mounted on the bolt After sliding from the upper side to the lower side along the slanted outer circumference of the nut body, the non-smooth surface of the trapezoidal cone and the non-smooth surface of the outer body of the outer body pressed into the nut body rub against each other. Since it does not slip due to the resistance, it cannot perform reverse movement, that is, rotation or reverse sliding even when it receives continuous or intermittent vibration or impact, and the same effect as in claim 2 is obtained.

According to a fifth aspect of the invention, in addition to the effect of the first aspect of the invention, the back-movement preventing member is one of the outer peripheral surface of the trapezoidal cone and the inner wall surface of the hollow portion of the exterior body. Since both surfaces are made of magnetic material and one of the surfaces is a surface made of magnetic material, the other surface is made of magnetic material. Since the outer body, which is mounted on the trapezoidal cone of the mounted nut body, is magnetically attached and fixed by the magnetic force, it cannot move backward, and the same effect as in claim 2 is obtained.

According to a sixth aspect of the present invention, in addition to the effect of the second aspect of the invention, the backward movement preventing member is one of the outer peripheral surface of the trapezoidal cone and the inner wall surface of the hollow portion of the outer casing. Since both surfaces are formed of an elastic body made of a high molecular compound, the exterior body exterior to the nut body cannot rotate or slide backward, and the same effect as the invention of claim 2 can be obtained. Was given.

According to a seventh aspect of the invention, in addition to the effects of the first to sixth aspects, a part of the thread groove of the hollow portion of the nut body has a pitch slightly different from the thread groove of the outer circumference of the bolt. Alternatively, since it is formed as the second reverse motion preventing member composed of a slightly different shaped screw groove, a synergistic effect with the reverse motion preventing member can be obtained, so that continuous or intermittent vibration or impact is applied. Further, the nut body is more securely pressed against the bolt and cannot be reversely moved, that is, rotated or reversely slid, so that a more effective non-loosening nut can be obtained.

According to the invention of claim 8, in addition to the effects of the inventions of claims 1 to 7, since an annular notch is formed on the outer periphery of the other end of the hollow portion of the nut body, one end of the nut body is expanded. When inserted into the bolt, the diameter of the other end of the hollow portion of the nut body is enlarged by the amount of the annular cutout portion, so that a non-loosable nut in which the nut body can be easily inserted from the end portion of the bolt is obtained.

According to a ninth aspect of the present invention, in addition to the effects of the first to eighth aspects, a protrusion in the reverse radial direction toward the center line of the hollow portion is provided in a part of the hollow portion of the nut body. Therefore, when the nut main body is pressed against the bolt, the projection in the reverse radial direction is crimped on the outer periphery of the bolt and cannot be loosened, and a more effective non-loosening nut is obtained.

According to a tenth aspect of the invention, in addition to the effect of the ninth aspect of the invention, an obtuse angle is formed with respect to the center line of the hollow portion of the exterior body from the inclined inner wall surface of the hollow portion of the exterior body. Since the inner wall surface is formed, when the nut body is pressed tight against the bolt, the outer peripheral surface of the trapezoidal cone of the nut body, which has a projection in the reverse radial direction due to the obtusely inclined inner wall surface, moves in the reverse radial direction. When pressed, the projection in the reverse radial direction is securely crimped to the outer periphery of the bolt, which ensures the effect of the invention of claim 9.

The invention according to claim 11 is the invention according to any one of claims 1 to 1.
In addition to the effect of the invention described in 0, since the retaining ring made of a spring material that abuts on one end surface of the outer casing and whose inner surface meshes with the thread groove of the bolt is provided, the nut body mounted on the bolt is tightly attached to the bolt. When pressed and fixed by the reverse movement prevention member, the retaining ring made of a spring material abuts on one end of the exterior body and the inner surface meshes with the screw groove of the bolt. Was further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a non-loosening nut according to the present invention.

FIG. 2 is a vertical cross-sectional view (showing a nut body) taken along line AA of FIG.

FIG. 3 is an enlarged exploded vertical cross-sectional view showing a state before the exterior body is exteriorly mounted on the nut body attached to the bolt of the non-loosening nut according to the present invention.

FIG. 4 is an enlarged vertical sectional view showing a state in which a non-loosening nut according to the present invention is fastened to a bolt.

FIG. 5 is a vertical cross-sectional view of a nut body of a non-loosening nut according to the present invention.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is an exploded perspective view of a nut body of a non-loosable nut according to the present invention.

FIG. 8 is an enlarged exploded vertical cross-sectional view showing a state before the exterior body is exteriorly mounted on the nut body attached to the bolt of the non-loosable nut according to the present invention.

9 is a cross-sectional view taken along the line CC of FIG. 7 (however, the pitch of some screw grooves and the position of the connecting portion are different).

FIG. 10 is a vertical cross-sectional view of a nut body of a non-loosening nut according to the present invention.

FIG. 11 is a vertical cross-sectional view of the nut body of the non-loosening nut according to the present invention.

FIG. 12 is an enlarged exploded vertical cross-sectional view showing a state before the exterior body is exteriorly mounted on the nut body attached to the bolt of the non-loosening nut according to the present invention.

FIG. 13 is an enlarged vertical cross-sectional view showing a state in which a non-loosening nut according to the present invention is fastened to a bolt.

FIG. 14 is an exploded perspective view showing a conventional example.

[Explanation of reference symbols] X ... Bolt 1 ... Nut body 2 ... Nut body 3 ... Square column base 3a, 3b ... Connection part 4 ... ..Hollow part 4a ... Screw groove 4b ... Screw groove (second reverse movement preventing member) 5 ... Slit 6 ... Annular notch 7 ... Reverse Radial protrusion 11 ... Exterior body 12 ... Hollow part 13 ... Protrusion 15 ... Obtuse inner wall surface 21 ... Reverse movement prevention member 22, 23 ... Non Sliding surface 24 ··· Reverse movement preventing member 25, 26 · · · Thread groove 31 · · · Retaining ring made of spring material

Claims (11)

[Claims] 1. A nut body formed in a trapezoidal cone for mounting on a bolt, a prismatic pedestal formed in a lower portion of the nut body, and a center of the nut body and the prismatic pedestal. A double-type slack consisting of a nut body having a hollow portion penetrating the portion, and an outer body having a hollow portion slidable along the inclined outer periphery of the nut body formed on the nut body attached to the bolt. In the lock nut, the upper part of the nut body can be expanded or contracted, or the upper part of the nut body can be reduced in diameter and the side parts of the nut body can be opened and closed. It has multiple slits formed continuously on the nut body and polygonal column pedestal, and when the nut body is attached to the bolt, the exterior body is moved downward from above along the outer circumference of the nut body that is a trapezoidal cone. Slide toward Slack non nut, characterized in that to 緊圧 the nut body against the bolt by the. 2. The non-loostable nut according to claim 1, for preventing reverse movement of an exterior body that is slid downward from above along an outer circumference of a nut body formed in a nut body mounted on a bolt. A part of the outer circumference of the nut body and a hollow part of the outer body that comes into contact with a part of the outer circumference of the nut body when the outer body slides along the outer circumference of the nut body from above to below. Of the nut body, which has a trapezoidal cone of the nut body attached to the bolt, has an anti-reverse member formed on either or both of the parts, and moves the outer body downward from above. A non-loosening nut characterized in that, after sliding in the opposite direction, the outer body is pressed into the outer periphery of the nut body to press the nut body tightly against the bolt. 3. The non-loosening nut according to claim 2, wherein the reverse movement preventing member is formed by a thread groove, and is formed in a hollow portion of the exterior body screwed into the thread groove formed on the outer periphery of the nut body. The outer circumference of the nut body consists of a trapezoidal cone of the nut body mounted on the bolt, and the thread groove is formed by a thread groove with a pitch slightly different from that of the outer circumference of the nut body or a thread groove with a slightly different shape. After sliding the outer body downward from above along the ridge, the nut body is tightly pressed against the bolt by screwing the outer periphery of the nut body and the thread groove of the hollow part of the outer body with difficulty. A nut that cannot be loosened. 4. The non-loosening nut according to claim 2, wherein the reverse movement preventing member is formed of a non-smooth surface. 5. The non-loosening nut according to claim 2, wherein the reverse movement preventing member is formed of a magnetic material, and only one of the outer periphery of the nut body and a part of the hollow portion of the outer body is a magnetic body. A non-loosening nut, wherein either the outer periphery of the nut body or a part of the hollow portion of the exterior body is formed of a magnetic body. 6. The non-loosening nut according to claim 2, wherein the reverse movement preventing member is formed of an elastic body made of a polymer compound such as rubber or synthetic resin. 7. The non-loostable nut according to claim 1, wherein at least a part of the thread groove in the hollow portion of the nut body has a pitch slightly different from that of the thread groove on the outer circumference of the bolt. A non-loosening nut characterized in that it is a second reverse movement preventing member consisting of a slightly different shaped thread groove. 8. The non-loostable nut according to claim 1, wherein when the nut body is attached to the bolt, the nut body having an enlarged upper portion is easily inserted from the end portion of the bolt. A non-loosening nut characterized in that an annular notch is formed on the outer periphery of the lower end of the hollow portion of the nut body. 9. The non-loostable nut according to claim 1, wherein a part of the hollow part of the nut body is caulked to the outer circumference of the bolt when the nut body is pressed against the bolt. A non-loosable nut characterized in that a protrusion in a reverse radial direction toward the center line of the hollow portion is formed in a part of the hollow portion of the nut body. 10. The nut which cannot be loosened according to claim 9, wherein when the nut body is tightly pressed against the bolt, the projection in the reverse radial direction formed in the hollow portion of the nut body is securely crimped to the bolt. The slanted inner wall surface of the hollow part of the outer casing that contacts the outer periphery of the hollow part where the projection in the reverse radial direction of the main body is formed has an obtuse angle with respect to the center line of the hollow part of the nut body from the slanted outer periphery of the nut body. A non-loosening nut characterized by being formed as an inclined inner wall surface. 11. The non-loosening nut according to claim 1, wherein the nut body pressed against the bolt is fixed, so that a part of the lower end surface of the nut comes into contact with the upper end of the outer casing. A non-loosening nut characterized in that a snap ring whose inner surface meshes with the thread groove of the bolt is provided.