Anti-falling hidden self-tapping screw

Abstract

The utility model relates to the technical field of fasteners, in particular to an anti-falling hidden type self-tapping screw which comprises a conical tail, a bolt body and a pan head, the conical tail and the pan head are arranged at the bottom and the top of the bolt body respectively, threads are arranged on the outer circle of the bolt body, a hollow anti-loosening block is arranged above the bolt body, internal threads are arranged on the upper portion inside the anti-loosening block, and the anti-loosening block is arranged in the pan head. The anti-loosening block is matched with the pan head, and six evenly-distributed pricking needles are arranged in the anti-loosening block. The utility model has the advantages that: firstly, the structure is simple, and the manufacturing cost is low; secondly, the assembly is simple, and the production efficiency is high; and thirdly, the bolt body is solid, high in strength and not easy to break.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a hidden self-tapping screw which is anti-falling off. Background Art

[0002] Self-tapping screws generally refer to screws with pointed heads, coarse threads and a harder texture. They are usually used for non-metallic or softer metal materials. They can rely on their own threads to "tap, drill, squeeze and press" the consolidated body to produce corresponding threads, making them fit tightly with each other.

[0003] For example, the hidden anti-falling self-tapping screw with patent application number CN202121261380.6 includes a self-tapping screw body, the top shell of the self-tapping screw body is provided with a plum blossom groove, the bottom shell of the plum blossom groove is provided with a cavity one, the bottom shell of the cavity one is provided with a cavity two, the bottom shell of the cavity two is fixedly connected with a spring one, the top of the spring one is fixedly connected with a movable plate, the top shell of the movable plate is connected to a limiting block by bolts, trapezoidal blocks are provided on the left and right sides of the limiting block, the shell of the trapezoidal block on one side away from the limiting block is fixedly connected with a card block, the card block movably passes through the self-tapping screw body shell, the left and right side shells of the cavity two are fixedly connected with a fixed plate, and the fixed plate is located directly above the limiting block.

[0004] However, this structure has the following problems: first, the structure is complex and the manufacturing cost is high; second, the installation is complicated, and the bolt body is a split structure, otherwise it cannot be installed when the built-in structure is installed; third, the bolt body is built-in and hollow and split, the strength is insufficient, and it is easy to break. Utility Model Content

[0005] The utility model aims to provide a hidden self-tapping screw that prevents falling off, so as to solve the problems existing in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hidden anti-falling self-tapping screw, comprising a cone tail 1, a bolt body 3 and a pan head 8, the cone tail 1 and the pan head 8 are respectively arranged at the bottom and the top of the bolt body 3, the outer circle of the bolt body 3 is provided with a thread 2, and it is characterized in that: a hollow anti-loosening block 4 is arranged above the bolt body 3, and an internal thread 9 is arranged above the inside of the anti-loosening block 4 and cooperates with the pan head 8; six evenly distributed needles 10 are arranged inside the anti-loosening block 4; a fixedly connected pin 5 is provided between the anti-loosening block 4 and the bolt body 3.

[0007] Preferably, a fixing hole 7 cooperating with the latch pin 5 is provided above the bolt body 3 .

[0008] Preferably, a pull tab 6 is provided on the outer side of the latch 5 for easy removal.

[0009] Preferably, the pricking needle 10 is "T"-shaped, and a spring 11 is provided at the bottom.

[0010] Preferably, the anti-loosening block 4 is provided with a guide hole 12 cooperating with the puncture needle 10 .

[0011] Compared with the prior art, the utility model has the following beneficial effects: first, the structure is simple and the manufacturing cost is low; second, the assembly is simple and the production efficiency is high; third, the bolt body is solid, has high strength and is not easy to break. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure: 1. cone tail; 2. thread; 3. bolt body; 4. anti-loosening block; 5. latch; 6. pull-out; 7. fixing hole; 8. pan head; 9. internal thread; 10. needle; 11. spring; 12. guide hole. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] See also Figure 1 The utility model provides a technical solution: an anti-falling hidden self-tapping screw, comprising a cone tail 1, a bolt body 3 and a pan head 8, the cone tail 1 and the pan head 8 are respectively arranged at the bottom and the top of the bolt body 3, and the outer circle of the bolt body 3 is provided with a thread 2.

[0016] A hollow anti-loosening block 4 is provided above the bolt body 3, and an internal thread 9 is provided on the upper part of the anti-loosening block 4 and cooperates with the pan head 8. At the same time, six evenly distributed puncture needles 10 are provided in the anti-loosening block 4. The puncture needles 10 are "T"-shaped and have a spring 11 at the bottom. Under normal conditions, the puncture needles 10 are in the guide holes 12 under the action of the springs 11 and do not protrude from the anti-loosening block 4.

[0017] A fixedly connected latch 5 is provided between the anti-loosening block 4 and the bolt body 3 to ensure that the bolt body 3 rotates together with the anti-loosening block 4. A pull bar 6 for easy pulling out is provided on the outer side of the latch 5, and a fixing hole 7 cooperating with the latch 5 is provided above the bolt body 3.

[0018] When the bolt body 3 is inserted into the anti-loosening block 4, the pin 5 can be pulled out, and the pan head 8 is rotated again to make the bolt body 3 continue to move downward to squeeze the puncture needle 10, and the puncture needle 10 is inserted into the object to prevent loosening.

[0019] 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. A concealed self-tapping screw that prevents falling off, comprising a cone tail (1), a bolt body (3) and a pan head (8), wherein the cone tail (1) and the pan head (8) are respectively arranged at the bottom and the top of the bolt body (3), and the outer circle of the bolt body (3) is provided with a thread (2), characterized in that: A hollow anti-loosening block (4) is arranged above the bolt body (3), and an internal thread (9) is arranged above the anti-loosening block (4) and cooperates with the pan head (8); six evenly distributed puncture needles (10) are arranged inside the anti-loosening block (4); and a fixedly connected pin (5) is arranged between the anti-loosening block (4) and the bolt body (3).

2. The anti-falling hidden self-tapping screw according to claim 1, characterized in that: A fixing hole (7) matching with the latch pin (5) is provided above the bolt body (3).

3. The anti-falling hidden self-tapping screw according to claim 1, characterized in that: The outer side of the latch (5) is provided with a pull-out member (6) for easy pulling out.

4. The anti-falling hidden self-tapping screw according to claim 1, characterized in that: The pricking needle (10) is T-shaped and has a spring (11) at the bottom.

5. The anti-falling hidden self-tapping screw according to claim 1, characterized in that: The anti-loosening block (4) is provided with a guide hole (12) that cooperates with the pricking needle (10).

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