CN209943319U

CN209943319U - Anti-drop bolt

Info

Publication number: CN209943319U
Application number: CN201920584157.1U
Authority: CN
Inventors: 龚浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2020-01-14
Anticipated expiration: 2029-04-24

Abstract

The utility model discloses an anti-drop bolt, wherein the surface of the bolt is provided with a thread, the tail end of the thread is at least provided with N threads called as tail end threads, and the distance between the adjacent tail end threads is less than the thread pitch of the bolt; the distance between the adjacent tail end threads is 4 to 7 percent smaller than the thread pitch of the bolt; when the screw pitch of the bolt is 1.75 mm, the distance between the adjacent end threads is 0.07-0.12 mm smaller than the screw pitch of the bolt. The distance of the tail end thread of the bolt of the utility model is designed to be smaller than the normal thread pitch, so that the nut needs more strength in the initial installation stage and when the nut is separated from the bolt; the automatic stop device is matched with the characteristic that the electric wrench automatically stops when being blocked, so that the electric wrench is prevented from completely screwing the nut off the bolt, the completeness of parts is kept, and the loss of the bolt and the nut is reduced.

Description

Anti-drop bolt

Technical Field

The utility model relates to a machine part field especially relates to an anticreep bolt.

Background

Bolts and nuts are commonly used for the connection and fixation of mechanical parts; in some specific occasions, such as a cross fastener used for fixing scaffold steel pipes on a construction site, only tightening and loosening operations between a bolt and a nut are needed, and the nut is not required to be completely unscrewed from the bolt (if the nut is completely unscrewed from the bolt, the nut and the bolt are easily lost by workers, and the loss of the nut and the bolt is increased).

In the traditional way, a worker rotates the nut by using a common wrench, and generally can manually control to basically ensure that the nut is still sleeved on the bolt after being unscrewed. With the development of technology and economy, on the construction site of the present day, a lot of projects are that workers are provided with electric tools (such as electric wrenches) to rotate nuts, the electric wrenches are high in force and speed, most workers are not well controlled, and the nuts are easily directly screwed off the bolts, so that the nuts and the screws are lost in a large quantity.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a novel anticreep bolt, avoid electric spanner directly to spin the nut from the bolt down.

In order to solve the technical problem, the utility model discloses a technical scheme does: an anti-drop bolt is characterized in that a thread is arranged on the surface of the bolt, the tail end of the thread at least comprises N threads which are called tail end threads, and the distance between every two adjacent tail end threads is smaller than the thread pitch of the bolt; n is a natural number not less than 2, and N is usually 2 to 5.

The distance between the adjacent tail end threads is 4 to 7 percent smaller than the thread pitch of the bolt; for example: when the screw pitch of the bolt is 1.75 mm, the distance between the adjacent end threads is 0.07-0.12 mm smaller than the screw pitch of the bolt.

Has the advantages that: the distance of the tail end thread of the bolt of the utility model is designed to be smaller than the normal thread pitch, so that the nut needs more strength in the initial installation stage and when the nut is separated from the bolt; the automatic stop device is matched with the characteristic that the electric wrench automatically stops when being blocked, so that the electric wrench is prevented from completely screwing the nut off the bolt, the completeness of parts is kept, and the loss of the bolt and the nut is reduced.

Drawings

Fig. 1 is a schematic structural view of the anti-drop bolt of embodiment 1.

Wherein: 1. and a tail end screw thread.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

Example 1

As shown in fig. 1, the anti-slip bolt of the present embodiment is an M12 coarse bolt, a thread is provided on the surface of the bolt, the 3 threads at the end of the thread are referred to as end threads 1, and the distance between adjacent end threads 1 is 1.65 mm; the distance between the other threads is 1.75 mm of the thread pitch of a normal M12 coarse thread bolt.

The anti-falling bolt of the embodiment is used for a cross fastener of a building scaffold and is matched with a normal M12 nut; because the distance between the tail end threads 1 is 1.65 mm, extra force is needed when the nut is screwed in and out of the bolt, and the nut can be normally used after being sleeved with the bolt. When a construction worker uses the electric wrench to disassemble the scaffold, the resistance is increased when the electric wrench meets the tail end thread 1 in the later period of the rotating nut, and the electric wrench automatically stops; the loss caused by the separation of the nut and the bolt is avoided.

Although the embodiments of the present invention have been described in the specification, these embodiments are only for the purpose of presentation and should not be construed as limiting the scope of the present invention. Various omissions, substitutions, and changes may be made without departing from the spirit and scope of the invention.

Claims

1. The utility model provides an anticreep bolt which characterized in that: the surface of the bolt is provided with threads, the tail end of each thread at least has N threads which are called tail threads, and the distance between every two adjacent tail threads is smaller than the thread pitch of the bolt; n is a natural number not less than 2.

2. The anti-drop bolt according to claim 1, characterized in that: and N is 2-5.

3. The anti-drop bolt according to claim 1, characterized in that: the distance between the adjacent tail end threads is 4 to 7 percent smaller than the thread pitch of the bolt; when the screw pitch of the bolt is 1.75 mm, the distance between the adjacent end threads is 0.07-0.12 mm smaller than the screw pitch of the bolt.