Internal expansion screw

Abstract

The utility model discloses an internal expansion screw which is characterized in that the internal expansion screw comprises a screw rod, an expansion sleeve and a conical nut, the top end of the screw rod is provided with a hexagonal head, the top end of the expansion sleeve is provided with a hexagonal clamping ring, and the bottom end of the expansion sleeve is connected with the conical nut. The hexagonal clamping ring is arranged at the top end of the expansion sleeve, when the expansion sleeve is inserted into a wall, especially a wall similar to a hollow brick, the hexagonal clamping ring can increase friction between the expansion sleeve and the wall, and therefore it is guaranteed that when the threaded rod is screwed in, the threaded rod and the threaded rod cannot rotate together, and idling in the wall is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of parts for fastening in wall holes, in particular to an internal expansion screw. Background Art

[0002] In daily life, expansion screws are widely used, bringing great convenience to people's work and life. At present, the commonly used expansion screws are usually composed of expansion sleeves, cone head bolts, washers and nuts. The inner hole of the expansion sleeve is generally a cylindrical through hole, and the screw head is round. However, when this kind of expansion screw is used in a structure like a hollow brick, because there is no wall at the bottom of the expansion screw to provide friction, it is easy for the expansion sleeve to slip and idle when the screw is screwed in, resulting in the failure of the screw fixation. Utility Model Content

[0003] The utility model aims to provide an internal expansion screw to solve the problems in the above-mentioned background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0005] An internal expansion screw comprises a screw rod, an expansion sleeve and a conical nut. The top end of the screw rod is provided with a hexagonal head, the top end of the expansion sleeve is provided with a hexagonal clamping ring, and the bottom end of the expansion sleeve is connected with the conical nut.

[0006] Furthermore, the hexagonal clamping ring and the expansion sleeve are an integral structure.

[0007] Furthermore, the expansion screw also includes a washer.

[0008] Furthermore, the expansion sleeve is provided with a groove.

[0009] Furthermore, holes are provided on the groove.

[0010] Furthermore, the conical nut and the screw rod can be threadedly connected.

[0011] Beneficial effects:

[0012] A hexagonal clamping ring is provided at the top of the expansion sleeve in the expansion screw in the present application. When the expansion sleeve is inserted into a wall, especially a wall similar to a hollow brick, the hexagonal clamping ring can increase the friction between the expansion sleeve and the wall, thereby ensuring that the hexagonal clamping ring will not rotate together with the screw when the screw is screwed in, thereby causing idling in the wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the expansion screw in the utility model.

[0014] Figure 2 It is a schematic diagram of the screw structure in the utility model.

[0015] Figure 3 It is a structural schematic diagram of the expansion sleeve in the utility model.

[0016] Among them: 1. screw; 2. hexagonal head; 3. expansion sleeve; 4. hexagonal retaining ring; 5. conical nut; 6. groove; 7. washer. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Example

[0019] An internal expansion screw, such as Figures 1 to 3 As shown, it includes a screw rod 1, an expansion sleeve 3 and a conical nut 5, the top of the screw rod 1 is provided with a hexagonal head 2, the top of the expansion sleeve 3 is provided with a hexagonal clamping ring 4, and the hexagonal clamping ring 4 and the expansion sleeve 3 are an integral structure, and the bottom end of the expansion sleeve 3 is connected with the conical nut 5. The conical nut 5 and the screw rod 1 can be threadedly connected.

[0020] Specifically, the expansion screw in this embodiment is provided with a hexagonal clamping ring 4 at the top of the expansion sleeve 3. When the expansion sleeve 3 is inserted into the wall, the hexagonal clamping ring 4 will also be stuck in the wall. After the screw rod 1 is inserted into the expansion sleeve 3, the bottom is threadedly connected with the conical nut 5, so that the screw rod 1 and the expansion sleeve 3 are combined. When the screw rod 1 is pulled upward through the hexagonal head 2, the expansion sleeve 3 will be pulled and finally clamped and fixed. When used in a structure similar to a hollow brick, although there is no wall at the bottom of the expansion screw to provide friction, because the hexagonal clamping ring 4 of the expansion sleeve 3 can fully contact with the wall and generate a large friction, the screw rod 1 will not drive the expansion sleeve 3 to rotate together when it is screwed in, causing idling, so that the expansion screw can be more stably inserted into the structure similar to the hollow brick.

[0021] Preferably, the expansion screw also includes a washer 7, which is inserted into the screw 1 before the screw 1 is inserted into the expansion sleeve 3, so that when the screw 1 is tightened, the washer 7 is located between the hexagonal head 2 and the hexagonal retaining ring 4, increasing the friction between them and preventing the screw 1 from loosening due to vibration and other operations.

[0022] Preferably, the expansion sleeve 3 is provided with a groove 6 and a hole is provided on the groove 6. The groove 6 and the hole enable the expansion sleeve to open outward when the screw 1 rotates, and finally clamp together with the rotation of the screw 1 to achieve the purpose of expansion.

[0023] Although the embodiments of the present invention are described in the specification, these embodiments are only for reference and should not limit the protection scope of the present invention. Various omissions, substitutions and changes within the scope of the present invention should be included in the protection scope of the present invention.

Claims

1. An internal expansion screw, characterized in that: It comprises a screw rod, an expansion sleeve and a conical nut. The top end of the screw rod is provided with a hexagonal head, the top end of the expansion sleeve is provided with a hexagonal clamping ring, and the bottom end of the expansion sleeve is connected with the conical nut.

2. An internal expansion screw according to claim 1, characterized in that: The hexagonal clamping ring and the expansion sleeve are an integral structure.

3. An internal expansion screw according to claim 1, characterized in that: The expansion screw also includes a washer.

4. An internal expansion screw according to claim 1, characterized in that: The expansion sleeve is provided with a groove.

5. An internal expansion screw according to claim 4, characterized in that: The groove is provided with holes.

6. An internal expansion screw according to claim 1, characterized in that: The conical nut and the screw rod can be threadedly connected.

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