JP3100027U - Multiple loosening prevention nut device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple loosening prevention nut device.
SOLUTION: A concave taper portion and a convex taper portion are formed at the joint portion of the upper nut and the lower nut along the axial direction from the periphery of a screw hole at the joint portion of the upper nut and the lower nut, and the periphery of the convex taper portion is formed. A small amount of eccentricity is formed on the surface toward the screw hole, and a convex ring 13 and a locking groove on the inner periphery thereof are formed around the upper end of the screw hole of the upper nut, and a locking steel having a locking hole in the center is provided. The piece 30 is installed and fixed, the upper and lower nuts are tightened to the bolt, and the anti-loosening steel piece is tightened to the thread slant diameter of the bolt, thereby achieving the function of preventing loosening in multiples, and the cap is installed. Form anti-collision, anti-rust and dust-proof effect.
[Selection diagram] Fig. 1

Description

The present invention relates to a multiple loosening prevention nut device, and more particularly to a multiple loosening prevention nut device in which upper and lower nuts of an eccentric fitting type are combined with a loosening prevention steel piece and a cap.

In general, in an eccentric fitting type upper and lower nut structure, a concave taper portion and a convex taper portion are installed corresponding to the joint portion of the upper and lower nuts along the axial direction from around the screw hole, and the peripheral surface of the convex taper portion or the concave taper portion. A small amount of eccentricity is formed toward the screw hole to form a combination device for a loosening prevention nut.

ボ ル ト In the actual tightening work, the bolt is passed through the through hole of the part to be fixed and further tightened with the lower nut and the upper nut. Eccentric pressing occurs on the convex and concave taper portions of the upper and lower nuts, which causes the upper and lower nuts to be displaced in the radial direction toward the bolt, forming a wedge-shaped stress action, and preventing the loosening. Demonstrate.

However, such a nut for preventing loosening does not have any other structure for preventing loosening, other than tightening of its own thread and pressing force of eccentric fitting, and further improvement is required. In addition, since the threaded portion of the bolt is inserted into the nut and protrudes, the operator is easily damaged and rust is easily generated. In particular, when tightening the nut with a sleeve wrench, the upper nut does not have a design for the abutment for the sleeve wrench, so the sleeve wrench is also worn on the lower nut, making it impossible to achieve the wedge-shaped action of eccentric pressing. This has an effect on the effect of preventing loosening.

SUMMARY OF THE INVENTION The object of the present invention is to provide a kind of multiple anti-loosening nut device, which, besides tightening of its own thread of upper and lower nuts, and pressing force of eccentric fitting, anti-loosening steel strip on upper nut. This loosening prevention steel piece is tightened on the thread slope of the bolt to achieve multiple loosening prevention functions, and a cap is provided to prevent injuries and rust and to prevent dust. In addition, a flange is provided on the upper nut to form an abutment portion for a sleeve wrench around the entire circumference, which meets actual needs and can be used for industrial use.

The invention according to claim 1 comprises an upper nut and a lower nut, and a concave taper portion and a convex taper portion are formed in a joint portion between the upper nut and the lower nut along the axial direction from around the screw hole, and a convex taper portion or In a multiple loosening prevention nut device in which a small amount of eccentricity is formed on the peripheral surface of the concave tapered part toward the screw hole,
A protruding ring is formed in the upper nut along the axial direction from the upper end of the screw hole, and a locking groove is formed around the lower part of the inner circumference of the protruding ring. A multi-loosening prevention nut device is provided with a loose-prevention steel piece provided with a nut.
According to a second aspect of the present invention, there is provided a multi-loosening nut device according to the first aspect, wherein a cap having a lip on a bottom end outer periphery is provided on an upper surface of the loosening preventing steel piece combined with the upper nut, and a convex ring is provided. A multiple loosening prevention nut device characterized by being positioned by a locking groove.
According to a third aspect of the present invention, in the multiple loosening prevention nut device according to the first aspect, a flange is extended outward at a bottom end of the upper nut to form an abutting portion around the entire circumference, It is a multiple loosening prevention nut device.

In addition to the tightening of the upper and lower nuts and the pressing force of the eccentric fitting, in particular, the upper nut is provided with a steel piece to prevent loosening and tightened to the thread slant diameter of the screw part of the bolt. A function to prevent loosening is generated. In addition, the installation of the cap prevents injuries, rust, and dust. In addition, a flange is provided on the upper nut to form a contact portion with the sleeve wrench, thereby meeting actual demands and enabling industrial use.

The present invention is composed of an upper nut and a lower nut, and a concave taper portion and a convex taper portion are formed in a joint portion of the upper nut and the lower nut along the axial direction from around the screw hole, respectively, and a convex taper portion or a concave taper portion is formed. In the loosening prevention nut in which a small amount of eccentricity is formed on the peripheral surface of the upper nut toward the screw hole, in particular, a convex ring is formed along the axial direction from around the upper end of the screw hole of the upper nut. A locking groove of one circumference is formed in the lower part of the circumference, and a loosening prevention steel piece having a center locking hole is provided.

In the preferred embodiment, a cap with a bottom lip is installed on the top face of the anti-loosening steel piece of the upper nut, and is positioned by the locking groove of the convex ring.

In the preferred embodiment, an outward flange is formed at the bottom end of the upper nut, thereby forming an abutting portion around the entire circumference.

As shown in FIGS. 1 and 2, the loosening prevention nut of the present invention includes an eccentric fitting type upper nut 10 and a lower nut 20, and the upper nut 10 and the lower nut 20 can be formed in a hexagonal shape. Screw holes 11 and 21 penetrating vertically in the axial direction are provided at the center, and are used for screwing with the screw portion 51 of the bolt 50.

At the joint portion between the upper nut 10 and the lower nut 20, a concave tapered portion 12 and a convex tapered portion 22 are provided along the axial direction from the periphery of the screw holes 11 and 21, respectively. A slight eccentricity is formed on the peripheral surface of the portion 12) toward the screw hole 21 (or the screw hole 11).

主要 The main features of the present invention are as follows. A protruding ring 13 is formed along the axial direction around the upper end of the screw hole 11 of the upper nut 10 (FIGS. 2 and 3), and the loose-prevention steel piece 30 having the central locking hole 31 is left to stand. Two mutually opposing engaging sides 32 are provided on the inner periphery of the engaging hole 31. An inner lip 14 is pressed inward at an upper stage of the protruding ring 13 of the upper nut 10, and a locking groove 15 is formed at a lower stage of the inner periphery of the protruding ring 13, and a piece of loosening preventing steel is integrally formed. 30 are joined.

ほ か In addition, a flange 16 is formed outward at the bottom end of the upper nut 10 to form a contact portion around the circumference. The flange 16 extends outwardly from each side surface of the upper nut 10, and each corner is formed in a disk shape, and is used to abut the bottom edge of the sleeve wrench.

In the embodiment shown in FIGS. 4, 5 and 6, the upper nut 10 employs, in particular, a raised edge ring 130, in which the anti-loosening steel piece 30 is left, and on the upper surface of the anti-loosening steel piece 30, The cap 40 having the lip 41 on the outer periphery of the bottom end is left, and then the convex ring 130 is pressed inward to fix the loose-prevention steel piece 30 and the cap 40 together. The upper nut 10 protrudes upward.

In the initial tightening state shown in FIG. 6, the screw portion 51 of the bolt 50 passes through the corresponding through holes 62 provided in the two fixed parts 60 and 61, and then the lower nut 20 and the upper nut 10 The screw holes 21 and 11 are sequentially screwed into the screw portion 51, and the loosening prevention steel piece 30 abuts on the inclined thread diameter of the screw portion 51. The upper nut 10 and the lower nut 20 and their screw holes 11 and 21, the concave tapered portion 12, the loose-prevention steel piece 30, the cap 40, the bolt 50 and the screw portion 51 are all set to the same center line A. The center line a of the convex tapered portion 22 is provided eccentrically, whereby the center line A and the center line a form a small amount of eccentricity a ′.

That is, the upper nut 10 is subsequently tightened, that is, the eccentric convex tapered portion 22 and concave tapered portion 12 are strongly pressed, and the screw holes 11 and 21 of the upper nut 10 and the lower nut 20 are screwed around the screw portion 51 of the bolt 50. To a multiple thread slant diameter, thus achieving a multiple loosening prevention function. In addition, the cap 40 completely shields the edge of the screw portion 51 to prevent injury, and also prevents rust and dust.

In the process of tightening the upper nut 10, the entire peripheral contact portion formed by the flange 16 at the bottom end of the upper nut 10 is used for contact with a sleeve wrench, and the sleeve wrench is wrapped around the lower nut 20 to provide a wedge-shaped tightening effect. Prevent it from becoming impossible.

FIG. 3 is an exploded perspective view of the nut for preventing loosening according to the embodiment of the present invention. It is a perspective view which combined the loosening prevention steel piece with the upper nut of FIG. It is sectional drawing of FIG. FIG. 3 is a perspective view of the upper nut of FIG. 2 with a cap added. FIG. 5 is an exploded perspective view of FIG. 4. FIG. 4 is an initial tightening state diagram of the multiple loosening prevention nut device according to the embodiment of the present invention. FIG. 7 is a diagram showing a tightening state of FIG. 6.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 Upper nut 11 Screw hole 12 Concave taper part 13 Convex ring 14 Inner peripheral lip 15 Lock groove 16 Flange 130 Convex ring 20 Lower nut 21 Screw hole 22 Convex taper part 30 Loose prevention steel piece 31 Lock hole 32 Lock Side 40 Cap 41 Lip 50 Bolt 51 Screw part 60 Fixed part 61 Fixed part 62 Through hole A Center line a Center line a 'A small amount of eccentricity

Claims (3)

It is composed of an upper nut and a lower nut, and a concave taper portion and a convex taper portion are formed in the joint portion between the upper nut and the lower nut along the axial direction from around the screw hole, and on the peripheral surface of the convex taper portion or the concave taper portion. In a multiple loosening prevention nut device where a slight eccentricity is formed toward the screw hole,
A protruding ring is formed in the upper nut along the axial direction from the upper end of the screw hole, and a locking groove is formed around the lower part of the inner circumference of the protruding ring. A multiple loosening prevention nut device, wherein a loosening preventing steel piece provided with is installed. 2. The multiple loosening prevention nut device according to claim 1, wherein a cap having a lip on a bottom end outer periphery is provided on an upper surface of the loosening prevention steel piece combined with the upper nut, and is positioned by the locking groove of the convex ring. A multiple loosening prevention nut device. 2. The multiple loosening prevention nut device according to claim 1, wherein a flange extends outward from a bottom end of the upper nut to form an abutment portion around the entire circumference.

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