Anti-theft locknut

Abstract

The utility model discloses an anti-theft locknut which comprises a mounting piece, a main bolt, a locking nut and an abutting nut, the main bolt penetrates through the mounting piece, the top end of the main bolt is fixedly connected with a main bolt head, the locking nut and the abutting nut are both connected to the surface of the main bolt in a threaded mode, and an auxiliary bolt for fixing the abutting nut is further installed at the bottom of the abutting nut. The auxiliary bolt is fixedly connected with the bottom end of the main bolt in an inserted mode, a beveled groove is formed in the lower surface of the locking nut, the section of the beveled groove is in a circular truncated cone shape, and an abutting table matched with the beveled groove is integrally formed on the top of the abutting nut. The anti-theft and anti-loosening nut is reasonable in structural design and convenient to use, adopts a double-nut structural mode and is used for locking and abutting tightly, the double-nut structural mode and the double-nut structural mode are in non-rigid connection, synchronous loosening caused by vibration factors can be effectively avoided, the production cost is low, the application range is wide, and the anti-theft and anti-loosening nut has extremely high utilization value and extremely good anti-theft and anti-loosening effects.

Description

Technical Field

[0001] The utility model relates to the technical field of nuts, in particular to an anti-theft and anti-loosening nut. Background Technique

[0002] In the patent document CN202010916490.5, "wedge-shaped anti-loosening nut" is disclosed, which includes a nut body and a bolt body. A concave round table surface is provided at the rear end of the nut body in the screwing direction. It also includes: a nut tightening member, which is sleeved on the screw rod of the bolt body and is adapted to the round table surface. In this patent, anti-theft and anti-loosening are achieved by setting double nuts. The internal thread pitches and rotation directions of the two nut parts split from this patent are the same. When in a vibrating environment, the two nut parts will also loosen synchronously at the same vibration frequency, and the use effect is poor.

[0003] In the patent document CN202121180912.3, "anti-theft and anti-loosening nut" is disclosed, which includes a first nut and a second nut. The first nut has a first screw hole inside. Although this patent solves the problems existing in the above patent, it uses a bolt with positive and negative threads for installation, and this bolt has a structure that is thick at the top and thin at the bottom. This kind of bolt structure is not common in life and is less produced, so it cannot meet the usage needs of various fields.

[0004] Therefore, we propose an anti-theft and anti-loosening nut to solve the problems raised in the above background technique. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-theft and anti-loosening nut to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solution: an anti-theft and anti-loosening nut, including a mounting member, a main bolt, a locking nut and a pressing nut. The main bolt passes through the mounting member and a main bolt head is fixedly connected to the top end. The locking nut and the pressing nut are both threadedly connected to the surface of the main bolt. A sub-bolt for fixing it is also installed at the bottom of the pressing nut, and the sub-bolt is inserted and fixed to the bottom end of the main bolt.

[0007] Further, an inclined cutting groove is opened on the lower surface of the locking nut. The cross-sectional shape of the inclined cutting groove is frustum-shaped, and a pressing platform adapted to the inclined cutting groove is integrally formed at the top of the pressing nut.

[0008] Further, a number of ball grooves are equidistantly opened on the arc surface outside the pressing platform, and balls are movably connected in the ball grooves.

[0009] Further, an internal thread cylinder is welded to the bottom of the pressing nut through a support rod, and the sub-bolt is threadedly connected to the internal thread cylinder.

[0010] Further, a plurality of locking holes adapted to the secondary bolts are equidistantly and circumferentially formed at the edge of the bottom end of the main bolt.

[0011] Further, a secondary bolt head is fixedly connected to the bottom end of the secondary bolt, and special-shaped tightening holes are formed on one side of both the main bolt head and the secondary bolt head.

[0012] Further, a washer is provided at the bottom of the main bolt head and corresponding to the outside of the main bolt, and the bottom of the washer is in contact with the top of the mounting member.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] After the main bolt of the present utility model is inserted through the mounting member, the locking nut is first tightened to achieve fixation. After completion, the tightening nut is then rotated upward, so that the tightening platform is screwed into the internal beveled groove to form a support. Finally, under the connection of the internal thread cylinder, the secondary bolt is screwed into the corresponding locking hole to form a fixation with the main bolt. When the secondary bolt is screwed in, since the locking hole is formed at the edge of the bottom end of the main bolt rather than the axis, the tightening nut cannot be rotated at this time, and a stable support below the locking nut can be achieved. At the same time, a plurality of balls are installed on the arc-shaped inclined surface of the tightening platform. Under the support of the tightening nut, even if the locking nut becomes loose, since it is not directly connected to the tightening nut and in cooperation with the low-friction connection of the balls, it cannot drive the tightening nut to rotate synchronously, further improving the anti-loosening effect. This anti-theft and anti-loosening nut has a reasonable structural design and is convenient to use. It adopts a double-nut structural method, which is respectively used for locking and tightening, and the two are not rigidly connected, which can effectively avoid synchronous loosening caused by vibration factors. Moreover, the production cost is low, the applicable range is wide, and it has extremely high utilization value and excellent anti-theft and anti-loosening effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a structural sectional view of the present utility model;

[0016] Figure 2 is a structural sectional view of the locking nut of the present utility model;

[0017] Figure 3 is a three-dimensional structural schematic diagram of the tightening nut of the present utility model;

[0018] Figure 4 is a three-dimensional structural schematic of the main bolt of the present utility model Figure 1 ;

[0019] Figure 5 is a three-dimensional structural schematic of the main bolt of the present utility model Figure 2 。

[0020] In the figure: 1 mounting piece, 2 main bolt, 3 locking nut, 4 tightening nut, 5 main bolt head, 6 auxiliary bolt, 7 bevel cut groove, 8 tightening platform, 9 ball groove, 10 ball, 11 support rod, 12 internally threaded cylinder, 13 locking hole, 14 auxiliary bolt head, 15 special-shaped tightening hole, 16 washer. Specific implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-5 , an anti-theft and anti-loosening nut, comprising a mounting piece 1, a main bolt 2, a locking nut 3 and a tightening nut 4. The main bolt 2 passes through the mounting piece 1 and the top end is fixedly connected with a main bolt head 5. The locking nut 3 and the tightening nut 4 are both threadedly connected to the surface of the main bolt 2. The bottom of the tightening nut 4 is also provided with an auxiliary bolt 6 for its fixation, and the auxiliary bolt 6 is inserted and fixed to the bottom end of the main bolt 2.

[0023] Specifically, a bevel cut groove 7 is opened on the lower surface of the locking nut 3, and the cross-sectional shape of the bevel cut groove 7 is frustum-shaped. The top of the tightening nut 4 is integrally formed with a tightening platform 8 adapted to the bevel cut groove 7.

[0024] Specifically, a plurality of ball grooves 9 are equidistantly opened on the arc surface outside the tightening platform 8, and balls 10 are movably connected in the ball grooves 9. When the locking nut 3 is loosened by vibration, the balls 10 are used to support it from the bevel cut groove 7 below. Since the balls 10 connected by rolling have extremely small friction, when the tightening nut 4 is fixed, when the locking nut 3 is loosened, it will not drive the synchronous rotation of the tightening nut 4.

[0025] Specifically, the bottom of the tightening nut 4 is welded with an internally threaded cylinder 12 through a support rod 11, and the auxiliary bolt 6 is threadedly connected to the internally threaded cylinder 12.

[0026] Specifically, a plurality of locking holes 13 adapted to the auxiliary bolt 6 are equidistantly arranged around the edge of the bottom end of the main bolt 2. The number of the locking holes 13 should be as many as possible. When the tightening nut 4 cannot be moved upward by screwing, the auxiliary bolt 6 can be screwed into the corresponding locking holes 13. When the number of the locking holes 13 is large, no matter where the tightening nut 4 is screwed, the auxiliary bolt 6 connected thereto has holes that can be coaxially tightened. Even if complete alignment cannot be achieved, the tightening nut 4 can be slightly loosened, and the auxiliary bolt 6 can be screwed into the locking hole 13 closest to it. At this time, a good supporting effect on the locking nut 3 can also be achieved.

[0027] Specifically, the bottom end of the secondary bolt 6 is fixedly connected to a secondary bolt head 14, and one side of the main bolt head 5 and the secondary bolt head 14 are provided with a special-shaped tightening hole 15. By providing the special-shaped tightening hole 15, it is possible to prevent the theft by rotating with common tools, thereby improving the anti-theft effect. In addition, the outer edges of the main bolt head 5 and the secondary bolt head 14 both adopt a circular arc surface structure, which is also not convenient for rotating from the side with tools.

[0028] Specifically, a washer 16 is provided at the bottom of the main bolt head 5 and corresponding to the outer side of the main bolt 2. The bottom of the washer 16 contacts the top of the mounting member 1. The washer 16 can play a certain sealing effect.

[0029] The anti-theft and anti-loosening nut has a reasonable structural design and is easy to use. It adopts a double-nut structure, which is used for locking and tightening respectively, and the two are non-rigidly connected, which can effectively avoid synchronous loosening caused by vibration factors. It has low production cost, a wide range of applications, extremely high utilization value and excellent anti-theft and anti-loosening effects.

[0030] When in use, after the main bolt 2 is inserted through the mounting member 1, the locking nut 3 is first tightened to fix it. After completion, the locking nut 4 is rotated upward so that the locking platform 8 is screwed into the inside of the bevel groove 7 to form a support. Finally, under the connection of the internal threaded tube 12, the secondary bolt 6 is screwed into the corresponding locking hole 13 to form a fixation with the main bolt 2. When the secondary bolt 6 is screwed in, since the locking hole 13 is opened at the bottom edge of the main bolt 2 and not the axis, the locking nut 4 cannot be rotated at this time, so that a stable support under the locking nut 3 can be achieved. At the same time, a number of balls 10 are also installed on the arc-shaped inclined surface of the locking platform 8. Under the support of the locking nut 4, even if the locking nut 3 is loose, since it is not directly connected to the locking nut 4, and cooperates with the low-friction connection of the balls 10, it cannot drive the locking nut 4 to rotate synchronously, thereby further improving the anti-loosening effect.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-theft and anti-loosening nut, comprising a mounting member (1), a main bolt (2), a locking nut (3) and a tightening nut (4), characterized in that: The main bolt (2) is inserted through the mounting member (1) and is fixedly connected to the top end thereof with a main bolt head (5); the locking nut (3) and the abutting nut (4) are both threadedly connected to the surface of the main bolt (2); a secondary bolt (6) is also installed at the bottom of the abutting nut (4) for fixing the secondary bolt; the secondary bolt (6) is plugged and fixed to the bottom end of the main bolt (2).

2. The anti-theft and anti-loosening nut according to claim 1, characterized in that: The lower surface of the locking nut (3) is provided with an oblique groove (7), the cross-sectional shape of the oblique groove (7) is a truncated cone, and the top of the locking nut (4) is integrally formed with an abutment platform (8) that matches the oblique groove (7).

3. The anti-theft and anti-loosening nut according to claim 2, characterized in that: A plurality of ball grooves (9) are provided at equal intervals on the arc-shaped surface outside the abutting platform (8), and balls (10) are movably connected in the ball grooves (9).

4. The anti-theft and anti-loosening nut according to claim 3, characterized in that: The bottom of the fastening nut (4) is welded with an internal threaded tube (12) via a frame rod (11), and the auxiliary bolt (6) is threadedly connected to the internal threaded tube (12).

5. The anti-theft and anti-loosening nut according to claim 4, characterized in that: A plurality of locking holes (13) matching the auxiliary bolts (6) are arranged at equal distances around the edge of the bottom end of the main bolt (2).

6. The anti-theft and anti-loosening nut according to claim 5, characterized in that: The bottom end of the auxiliary bolt (6) is fixedly connected with an auxiliary bolt head (14), and one side of each of the main bolt head (5) and the auxiliary bolt head (14) is provided with a special-shaped tightening hole (15).

7. The anti-theft and anti-loosening nut according to claim 6, characterized in that: A washer (16) is provided at the bottom of the main bolt head (5) and on the outer side of the main bolt (2), and the bottom of the washer (16) is in contact with the top of the mounting member (1).

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