CN219220984U

CN219220984U - Self-tapping screw

Info

Publication number: CN219220984U
Application number: CN202320180275.2U
Authority: CN
Inventors: 伍修骏; 李世锋; 潘永贵
Original assignee: Fanyi Precision Manufacturing Dongguan Co ltd
Current assignee: Fanyi Precision Manufacturing Dongguan Co ltd
Priority date: 2023-02-07
Filing date: 2023-02-07
Publication date: 2023-06-20
Anticipated expiration: 2033-02-07

Abstract

The utility model relates to the technical field of screws, and discloses a self-tapping screw, which comprises a screw head, wherein one end of the screw head is connected with a screw rod, the surface of the screw rod is provided with screw teeth, one end of the screw head is a conical surface, and the screw rod is coaxially arranged at the top end of the conical surface; the tail end of the first screw rod is coaxially connected with a tunneling head, the tunneling head is cylindrical, and the tail end of the tunneling head is a round head; at least three spiral cuts which are symmetrically arranged are arranged from the tail end of the tunneling head towards the direction of the screw head. When the utility model is used, the round head is propped against a plane to be fastened, the bottoms of the spiral cuts are contacted with the plane, and the bottom knife edges of the plurality of spiral cuts are screwed into the part, so that the surrounding stress of the tunneling head is balanced in the tunneling process, and the deflection condition can not occur.

Description

Self-tapping screw

Technical Field

The utility model relates to the technical field of screws, in particular to a self-tapping screw.

Background

The self-tapping screw is a pointed, thick-tooth and hard-textured screw, the specific structure is shown in fig. 5, in order to screw the self-tapping screw into a part quickly, threads on the screw rod are all extended to the tip of the self-tapping screw (as indicated by arrow A in fig. 5), in the process of screwing the screw, when the tip of the screw and the part are in contact screwing, the top of the screw is acted by biasing force, so that the screw is easy to deflect, and finally the screw is inclined, and therefore, the self-tapping screw is provided.

Disclosure of Invention

Aiming at the defects of the existing self-tapping screw, the utility model provides the self-tapping screw which has the advantage of stable tunneling and solves the problems in the prior art.

The utility model provides the following technical scheme: the self-tapping screw comprises a screw head, wherein one end of the screw head is connected with a screw rod, screw teeth are arranged on the surface of the screw rod, one end of the screw head is a conical surface, and the screw rod is coaxially arranged at the top end of the conical surface;

the tail end of the first screw rod is coaxially connected with a tunneling head, the tunneling head is cylindrical, and the tail end of the tunneling head is a round head;

at least three spiral cuts which are symmetrically arranged are arranged from the tail end of the tunneling head towards the direction of the screw head.

Preferably, a center is arranged at the middle position of the round head.

Preferably, the end of the screw head far away from the screw rod is provided with a cross-shaped groove.

Preferably, at least one bayonet is formed at the top of the screw thread, the bayonet comprises a limiting surface and a parallel surface, the parallel surface is positioned at the bottom of the bayonet, and the limiting surface is parallel to the axis of the screw and extends to the outside of the screw thread;

the limiting surface is arranged by passing through the diameter of the screw rod, and the joint of the limiting surface and the thread crest is designed as an arc chamfer.

Compared with the existing self-tapping screw, when the self-tapping screw is used, the round head is propped against a plane to be fastened, the bottoms of the spiral cuts are contacted with the plane, and the bottom knife edges of the plurality of spiral cuts are screwed into the part, so that the surrounding stress of the tunneling head is balanced in the tunneling process, and the deflection condition can not occur.

Drawings

Fig. 1 is a schematic diagram of the structure of the present utility model.

Fig. 2 is a schematic diagram of a second embodiment of the present utility model.

Fig. 3 is a right side view of the present utility model.

Fig. 4 is a front view of the present utility model.

Fig. 5 shows a conventional self-tapping screw.

In the figure: 1. a screw head; 2. a screw; 3. a bayonet; 4. arc chamfering; 5. a tunneling head; 6. a circular head; 7. a spiral incision; 8. screw threads; 9. a center; 10. a limiting surface; 11. parallel surfaces; 12. a cross-shaped groove.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-5, a self-tapping screw comprises a screw head 1, wherein one end of the screw head 1 is connected with a screw rod 2, the surface of the screw rod 2 is provided with screw teeth 8, one end of the screw head 1 is a conical surface, and the screw rod 2 is coaxially arranged at the top end of the conical surface;

the tail end of the first screw rod 2 is coaxially connected with a tunneling head 5, the tunneling head 5 is cylindrical, and the tail end of the tunneling head 5 is a round head 6;

at least three symmetrically arranged spiral cuts 7 are formed from the tail end of the tunneling head 5 towards the direction of the screw head 1, as shown in fig. 2, the edges of the spiral cuts 7 are in a knife edge shape, the spiral cuts 7 are positioned on the round head 6, when the round head 6 is abutted against a plane to be fastened, the bottoms and the planes of the spiral cuts 7 are contacted, and when the spiral cuts 7 rotate, the bottom knife edges of the spiral cuts 7 are screwed into the part;

as shown in fig. 2, the spiral incision 7 is symmetrically provided with a plurality of spiral incisions 7, the plurality of spiral incisions 7 simultaneously screw into the part, and the plurality of spiral incisions 7 simultaneously bear force, so that the screw rod 2 and the heading head 5 are balanced in stress and are not biased, and the heading head 5 can drive the screw rod to tunnel along a straight line into the part.

As shown in fig. 4, a center 9 is installed in the middle of the round head 6, the center 9 is propped against the surface of the part, so that the end of the screw is prevented from sliding, and particularly when the part such as plastic, wood board and the like is locked, the center 9 can be directly nailed on the surface without sliding.

As shown in fig. 1, a cross-shaped groove 12 is formed in one end of the screw head 1, which is far away from the screw rod 2.

As shown in fig. 1, 2 and 3, at least one bayonet 3 is arranged at the top of the screw thread 8, the bayonet 3 comprises a limiting surface 10 and a parallel surface 11, the parallel surface 11 is positioned at the bottom of the bayonet 3, and the limiting surface 10 and the axis of the screw 2 are parallel and extend to the outside of the screw thread 8;

the limiting surface 10 is arranged by passing through the diameter of the screw rod 2, and the joint of the limiting surface 10 and the crest of the screw tooth 8 is designed as an arc chamfer 4. As shown in fig. 3, when the screw 2 rotates (as shown by an arrow in fig. 3), the limiting surface 10 rotates along the arrow direction, and when the screw rotates to a preset position, if the limiting surface 10 rotates in the direction, the limiting surface 10 forms a barb-like limiting structure, so that the screw is prevented from rotating loose.

Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a self-tapping screw, includes screw head (1), and screw head (1) one end is connected with screw rod (2), and the surface of screw rod (2) is equipped with screw tooth (8), its characterized in that: one end of the screw head (1) is a conical surface, and the screw rod (2) is coaxially arranged at the top end of the conical surface;

the tail end of the screw rod (2) is coaxially connected with a tunneling head (5), the tunneling head (5) is cylindrical, and the tail end of the tunneling head (5) is a round head (6);

at least three spiral cuts (7) which are symmetrically arranged are arranged from the tail end of the tunneling head (5) towards the direction of the screw head (1).

2. A self-tapping screw as claimed in claim 1, wherein: a center (9) is arranged at the middle position of the round head (6).

3. A self-tapping screw as claimed in claim 1, wherein: the end of the screw head (1) far away from the screw rod (2) is provided with a cross-shaped groove (12).

4. A self-tapping screw as claimed in claim 1, wherein: at least one bayonet (3) is formed at the top of the screw tooth (8), the bayonet (3) comprises a limiting surface (10) and a parallel surface (11), the parallel surface (11) is positioned at the bottom of the bayonet (3), and the axes of the limiting surface (10) and the screw (2) are parallel and extend to the outside of the screw tooth (8);

the limiting surface (10) is arranged by passing through the diameter of the screw (2), and the joint of the limiting surface (10) and the crest of the screw tooth (8) is designed as an arc chamfer (4).