CN216842581U

CN216842581U - Novel self-tapping screw

Info

Publication number: CN216842581U
Application number: CN202123115731.5U
Authority: CN
Inventors: 董恒宇; 燕存露
Original assignee: SHANGHAI AUTOCRAFT CO Ltd
Current assignee: SHANGHAI AUTOCRAFT CO Ltd
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-06-28
Anticipated expiration: 2031-12-02

Abstract

The utility model discloses a novel self-tapping screw, head and pole portion including integrated into one piece, the pole portion outside is provided with first screw thread, has seted up the fixed slot on the head, the hole has been seted up to the inboard extension in pole portion to the tank bottom of fixed slot, the second screw thread has been seted up on the wall of hole. The utility model discloses a soft material base member of first screw thread screw in then screws up through ordinary bolt spiro union second screw to reach the purpose of assembly, the operation simple to operate.

Description

Novel self-tapping screw

Technical Field

The utility model relates to a fastener technical field, concretely relates to novel self-tapping screw.

Background

The self-tapping screw is used for connecting pieces of soft base materials such as wood, injection molding and the like.

The self-tapping screw that provides among the prior art to ST self-tapping screw is the example, and it taps into on being fit for the plastic slab, and the screw has great pitch and tooth height, and convenient quick the twist just can bear great loading capacity.

At present, by utilizing the ST self-tapping screw, on one hand, the tooth form angle of the ST self-tapping screw is larger, the radial force generated by screwing is larger, a plastic part can generate larger deformation, the assembly is greatly influenced by the environmental temperature, the phenomenon of screw thread slipping is easily caused by screwing, and the utilization rate of the screw is lower; on the other hand, friction generated in the self-tapping screw tightening process is unstable, the final axial force dispersion is increased, the generated axial force is not easy to monitor, and the method is suitable for an excellent assembly method and cannot solve the problem.

Therefore, how to assemble the soft material on the soft material is a problem to be solved urgently for those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a self-tapping screw to exist among the above-mentioned background art not enough, this self-tapping screw can make the screwing up have great axial force through its structural design, and coefficient of friction is relatively stable, advantages such as difficult smooth silk.

In order to achieve the above object, the utility model relates to a novel self-tapping screw has adopted following technical scheme:

the utility model provides a novel self-tapping screw, includes integrated into one piece's head and pole portion, the pole portion outside is provided with first screw thread, has seted up the fixed slot on the head, the hole has been seted up to the inboard extension in pole portion to the tank bottom of fixed slot, the second screw thread has been seted up on the wall of hole.

The utility model relates to a novel tapping screw's further improvement part lies in, the head is cylindrical, the fixed slot is hexagonal groove structure.

The utility model relates to a novel self-tapping screw's further improvement part lies in, first screw thread is helical thread structure, the screw-in end tooth type half angle of first screw thread is 10. On the one hand, the unthreaded hole can be easily tapped, and on the other hand, the shearing stress to the tapping process is reduced.

The utility model relates to a further improvement of a novel self-tapping screw, which is characterized in that the stroke of the first thread is longer than that of a metric thread, so that the purpose of the self-tapping screw can be quickly tapped; the second screw thread is metric screw thread, is convenient to be matched with common screw thread for use, and can provide stable axial force.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses a soft material base member of first screw thread screw in then screws up through ordinary bolt spiro union second screw to reach the purpose of assembly, the operation simple to operate.

2. The first thread of the utility model adopts a narrow inclination angle to effectively transfer materials, and has small requirement on force; the annular stress is reduced, the friction of thread forming is reduced, and the thread torque is reduced.

3. The utility model discloses a hexagonal head in, suitable assembly can not produce because convex head to the connecting piece and interfere in the counter bore at assembly connectors.

4. The utility model discloses the inside metric system helicitic texture that adopts of pole portion guarantees with ordinary bolt's normal cooperation, and this kind of cooperation reduces the scattered difference of bolt axial force after the assembly.

Drawings

FIG. 1 is a schematic sectional view of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

in the figure: 1 head part, 2 rod parts, 3 first threads, 4 fixing grooves, 5 inner holes and 6 second threads.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1 and 2, the novel self-tapping screw comprises a head part 1 and a rod part 2 which are integrally formed, wherein a first thread 3 is arranged on the outer side of the rod part, a fixed groove 4 is formed in the head part, an inner hole 5 is formed in the groove bottom of the fixed groove in an extending mode towards the inner side of the rod part, and a second thread 6 is formed in the wall of the inner hole. Specifically, the head 1 is cylindrical, and the fixing groove 4 is of a hexagonal groove structure. The depth of the hexagonal groove 4 is set to be about half of the thickness of the head 1, so that the phenomenon that the gun jumps due to the fact that the head falls off and the head is too shallow in the process of too large screwing is prevented.

Further, the first thread 3 is a spiral thread structure, and the thread-in end profile half angle of the first thread 3 is 10 °. First screw thread is asymmetric helicitic texture, compares normal ST screw thread profile angle and reduces 3 times, can reduce the stress that makes radial direction through the change of atress angle, prevents that the base material prefabricated hole from warping or splitting phenomenon.

Further, the first thread 3 has a longer stroke than a metric thread, and the second thread 6 is a metric thread. The major diameter of the second thread is smaller than half of the diameter of the rod part, and therefore the strength capability of the rod part is guaranteed.

The utility model discloses a theory of operation does: offer prefabricated hole on the substrate, will the utility model discloses a pole portion end is arranged prefabricated hole in, then, applies the interior hexagonal groove department of moment of torsion through screwing up the instrument, and the self-tapping screw begins the screw in substrate this moment, and until the complete screw in substrate stop work of self-tapping screw, the bolt passes at last and is screwed up by the second screw of connecting piece and hole and reach ultimate assembly.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. The utility model provides a novel self-tapping nail which characterized in that: including integrated into one piece's head and pole portion, the pole portion outside is provided with first screw thread, has seted up the fixed slot on the head, the hole has been seted up to the inboard extension of pole portion to the tank bottom of fixed slot, the second screw thread has been seted up on the wall of hole, first screw thread is the spiral thread structure, the half angle of the end profile of screwing in of first screw thread is 10, the stroke of first screw thread is longer than metric system screw thread, the second screw thread is metric system screw thread.

2. The novel self-tapping screw as claimed in claim 1, wherein: the head is cylindrical, and the fixed slot is of a hexagonal groove structure.