CN210318125U

CN210318125U - Fastening device

Info

Publication number: CN210318125U
Application number: CN201921188912.0U
Authority: CN
Inventors: 王亮
Original assignee: Shandong Ruibiao Machinery Co Ltd
Current assignee: Shandong Ruibiao Machinery Co Ltd
Priority date: 2019-07-26
Filing date: 2019-07-26
Publication date: 2020-04-14
Anticipated expiration: 2029-07-26

Abstract

Fastener, including the bolt and rather than complex nut, the bolt includes hexagon head and screw rod, and the tip surface of screw rod is equipped with the recessed internal screw thread blind hole that has, still is equipped with the cap body outward for the screw rod, and the internal center department vertical fixation of cap has the montant of external screw thread. The utility model discloses after screwing up the screw rod fastening with the nut and accomplishing to in the montant screw in blind hole of the cap body is screwed in to the rotatory opposite direction of nut, make the cap body and nut contact, screw up the cap body, when the nut is not hard up when the external rotation, the cap body is rotatory under the drive of contact surface frictional force, and the rotatory direction of the cap body is the direction that the montant screwed in to the blind hole just this moment, and the nut is not hard up can drive the cap body and further screw round of circling round of meeting, can prevent effectively that the nut is not hard up to fall from the screw rod.

Description

Fastening device

Technical Field

The utility model belongs to the technical field of the fastener, concretely relates to fastening device.

Background

The fastening bolt is a commonly used fastening device, is a cylindrical threaded fastener with a nut, and is a fastener consisting of a head part and a screw (a cylinder with external threads), and is required to be matched with the nut to be used for tightly connecting two parts with through holes.

SUMMERY OF THE UTILITY MODEL

To the technical problem above, an object of the utility model is to provide a fastening device.

The fastening device of the utility model comprises a bolt and a nut matched with the bolt, wherein the bolt comprises a hexagonal head and a screw rod, the end surface of the screw rod is provided with a concave blind hole with an internal thread, the screw rod is also provided with a cap body, and a vertical rod with an external thread is vertically fixed at the center of the inner part of the cap body;

when the nut is screwed in from the end part of the screw rod in the clockwise direction, the vertical rod is screwed in the blind hole in the anticlockwise direction under the matching of the external thread of the vertical rod and the internal thread of the blind hole;

when the nut is screwed in from the end part of the screw rod in the anticlockwise direction, the vertical rod is screwed in the blind hole in the clockwise direction under the matching of the external thread of the vertical rod and the internal thread of the blind hole.

When the screw rod is externally provided with a forward thread, the blind hole is internally provided with a reverse thread; when the screw rod is externally provided with a reverse thread, the blind hole is internally provided with a forward thread; the direction of the threads is changed, so that the nut and the vertical rod can be screwed in and out in different directions.

The lower surface of the nut and the upper surface of the cap body are provided with mutually meshed sawtooth surfaces, so that the friction force of the contact surface between the nut and the cap body is increased.

The inner diameter of the cap body is larger than the outer diameter of the screw rod, and the inner diameter of the cap body is smaller than the outer diameter of the nut.

The depth of the blind hole is greater than the height of the vertical rod.

Compared with the prior art, the utility model, following beneficial effect has.

The utility model discloses after screwing up the screw rod fastening with the nut and accomplishing to in the montant screw in blind hole of the cap body is screwed in to the rotatory opposite direction of nut, make the cap body and nut contact, screw up the cap body, when the nut is not hard up when the external rotation, the cap body is rotatory under the drive of contact surface frictional force, and the rotatory direction of the cap body is the direction that the montant screwed in to the blind hole just this moment, and the nut is not hard up can drive the cap body and further screw round of circling round of meeting, can prevent effectively that the nut is not hard up to fall from the screw rod.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic perspective view of the cap and the stem of FIG. 1;

fig. 3 is a schematic structural view of the use state of fig. 1.

In the figure: 1. hexagonal head 2, screw rod 3, first part 4, second part 5, nut 6, cap body 7, montant 8, blind hole.

Detailed Description

Example 1

As shown in fig. 1-2, the fastening device of the present invention comprises a bolt and a nut 5 engaged therewith, the bolt comprises a hexagonal head 1 and a screw rod 2, a concave blind hole 8 with an internal thread is provided on the end surface of the screw rod 2, a cap body 6 is further provided outside the screw rod 2, and a vertical rod 7 with an external thread is vertically fixed at the center inside the cap body 6;

when the nut 5 is screwed in from the end of the screw rod 2 in the clockwise direction, the vertical rod 7 is screwed in the blind hole 8 in the anticlockwise direction under the matching of the external thread of the vertical rod 7 and the internal thread of the blind hole 8.

A serrated surface meshed with each other is arranged between the lower surface of the nut 5 and the upper surface of the cap body 6.

The inner diameter of the cap body 6 is larger than the outer diameter of the screw rod 2, and the inner diameter of the cap body 6 is smaller than the outer diameter of the nut 5.

The depth of the blind hole 8 is larger than the height of the vertical rod 7.

Fig. 3 shows a schematic structural view of the present invention when fastening the first and

second parts

3 and 4.

Example 2

When a different nut 5 is screwed in a counterclockwise direction from the end of the screw 2 as described in embodiment 1, the stem 7 is screwed into the blind hole 8 in a clockwise direction by the external thread of the stem 7 and the internal thread of the blind hole 8.

Claims

1. The utility model provides a fastening device, includes bolt and rather than complex nut (5), the bolt includes hexagon head (1) and screw rod (2), its characterized in that: a concave blind hole (8) with an internal thread is formed in the surface of the end part of the screw rod (2), a cap body (6) is further arranged outside the screw rod (2), and a vertical rod (7) with an external thread is vertically fixed at the inner center of the cap body (6);

when the nut (5) is screwed in from the end part of the screw rod (2) in the clockwise direction, the vertical rod (7) is screwed in the blind hole (8) in the anticlockwise direction under the matching of the external thread of the vertical rod (7) and the internal thread of the blind hole (8);

when the nut (5) is screwed in from the end part of the screw rod (2) in the anticlockwise direction, the vertical rod (7) is screwed in the blind hole (8) in the clockwise direction under the matching of the external thread of the vertical rod (7) and the internal thread of the blind hole (8).

2. The fastening device of claim 1, wherein: a serrated surface meshed with each other is arranged between the lower surface of the nut (5) and the upper surface of the cap body (6).

3. The fastening device of claim 1, wherein: the inner diameter of the cap body (6) is larger than the outer diameter of the screw rod (2), and the inner diameter of the cap body (6) is smaller than the outer diameter of the nut (5).

4. A fastening device according to any one of claims 1-3, characterized in that: the depth of the blind hole (8) is larger than the height of the vertical rod (7).