Expansion screw with double outer hexagonal heads

Abstract

The utility model relates to the technical field of expansion bolts, in particular to a double-outer-hexagonal-head expansion screw which comprises a screw rod and an expansion pipe, a first outer hexagonal head is arranged at one end of the screw rod, external threads are arranged at the end, close to the first outer hexagonal head, of the screw rod, and a second outer hexagonal head is arranged on the outer wall of one end of the expansion pipe in a sleeved mode. The inner wall of the end, close to the second outer hexagonal head, of the expansion pipe is provided with an internal thread, the internal thread is in threaded connection with the external thread in a matched mode, the end, away from the second outer hexagonal head, of the expansion pipe is provided with a conical part, the inner diameter of the conical part is smaller than the outer diameter of the screw rod, and the conical part is provided with a plurality of straight slits. And the screw rod can be easily screwed out, and the expansion pipe can be pulled out, so that the expansion pipe can be recycled.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion bolts, in particular to a double external hexagon head expansion screw. Background Art

[0002] Expansion bolts, also known as expansion screws, are a special threaded connector used to fix pipeline supports / hangers / brackets or equipment on walls, floors, and columns. When in use, you must first use an impact drill (hammer) to drill holes of corresponding sizes on the fixed body, then install the bolts and expansion tubes into the holes, and tighten the nut to expand the bolts, expansion tubes, mounting parts and the fixed body into one. They will expand after tightening. There is a big head at the tail of the bolt, and a round tube slightly larger than the diameter of the bolt is covered on the outside of the bolt. There are several openings at the tail part. When the bolt is tightened, the tail of the big head is brought into the open pipe, expanding the pipe to achieve the purpose of expansion, and then the bolt is fixed to the ground or wall to achieve the purpose of rooting.

[0003] Existing expansion screws use a nut to pull the screw rod outward to expand the screw tail cone and the screw sleeve to achieve a fixing effect. However, this outward stretching method not only affects the appearance of the hole surface, but also shortens the effective contact length with the foundation and reduces stability. There is a certain gap between the hole wall and the screw sleeve and the screw rod. Under the action of external force, it is easy to loosen. It is difficult to pull out the casing during dismantling, so it is not suitable for reuse. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a double hexagon head expansion screw, which is easy to use, more stable and reliable, and can easily unscrew the screw and pull out the expansion tube so that it can be recycled.

[0005] The utility model is realized by the following technical solutions:

[0006] A double external hexagonal head expansion screw comprises a screw rod and an expansion tube, wherein a first external hexagonal head is arranged at one end of the screw rod, an external thread is arranged on the screw rod near the end of the first external hexagonal head, a second external hexagonal head is sleeved on the outer wall of one end of the expansion tube, an internal thread is arranged on the inner wall of the expansion tube near the end of the second external hexagonal head, the internal thread is threadedly connected with the external thread, a conical portion is arranged at the end of the expansion tube away from the second external hexagonal head, the inner diameter of the conical portion is smaller than the outer diameter of the screw rod, and a plurality of straight seams are arranged on the conical portion.

[0007] Further preferably, an inclined portion is provided between the lower edge of the second external hexagonal head and the outer wall of the expansion tube, and the inclined portion is inclined toward the second external hexagonal head.

[0008] Further preferably, there are two inclined portions, which are respectively arranged at the lower edges of two opposite sides of the second external hexagonal head.

[0009] Further preferably, a plurality of convex strips are provided on the circumferential outer wall of the expansion tube near one end of the second external hexagonal head, and the convex strips are straight lines along the axial direction of the expansion tube.

[0010] Further preferably, a gasket is disposed on the expansion tube sleeve, and the gasket is disposed between the second outer hexagonal head and the convex strip.

[0011] Beneficial effects of the utility model:

[0012] Compared with existing expansion screws, the double hexagonal head expansion screw of the utility model is easy to use, more stable and reliable, and the screw rod can be easily screwed out and the expansion tube can be pulled out, so that the expansion screw can be recycled.

[0013] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention. In the accompanying drawings:

[0015] Figure 1 The utility model is a structural schematic diagram of a double hexagonal expansion screw when it is not expanded.

[0016] Figure 2 The utility model is a structural schematic diagram of a double hexagonal expansion screw when expanding.

[0017] 1-screw, 2-expansion tube, 3-first external hexagonal head, 4-external thread, 5-second external hexagonal head, 6-internal thread, 7-conical part, 8-straight seam, 9-inclined part, 10-gasket, 11-convex strip. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0019] The double hexagonal reusable expansion screw comprises a screw rod 1 and an expansion tube 2. A first hexagonal head 3 is arranged at one end of the screw rod 1. The hexagonal head is a common setting for existing bolt heads. Hexagonal head bolts are divided into two types: hexagonal bolts and hexagonal screws. An external thread 4 is arranged on the screw rod 1 near one end of the first hexagonal head 3. A second hexagonal head 5 is sleeved on the outer wall of one end of the expansion tube 2. An internal thread 6 is arranged on the inner wall near one end of the second hexagonal head 5. The internal thread 6 is threadedly connected with the external thread 4. The expansion tube 2 is away from the second A conical portion 7 is provided at one end of the external hexagonal head 5, and the inner wall of the conical portion 7 is formed into a cone, that is, the inner diameter of the conical portion 7 gradually decreases toward the end of the expansion tube 2, and the inner diameter of the end opening of the conical portion 7 is smaller than the outer diameter of the screw 1. A plurality of straight seams 8 are provided on the conical portion 7 to separate the conical portion 7 so that each part of the cone expands outwards separately during expansion. When the screw 1 passes through the end of the conical portion 7, the conical portion 7 of the expansion tube 2 expands outwards, thereby being fastened to the hole in the wall. Preferably, there are three to six straight seams.

[0020] In this embodiment, the external thread 4 is arranged on the circumferential surface of the screw 1, and the external thread 4 is higher than the surface of the screw 1, that is, the thread is arranged to protrude outward from the surface of the screw 1, and the external thread 4 is threadedly connected with the internal thread 6. There is a certain gap between the place where there is no thread on the surface of the screw 1 and the expansion tube 2. For example, the inner diameter of the expansion tube 2 is nine millimeters, the inner diameter of the end of the conical portion 7 is six millimeters, the outer diameter of the external thread 4 is nine millimeters, and the outer diameter of the screw 1 is seven millimeters.

[0021] In this embodiment, an inclined portion 9 is provided between the lower edge of the second outer hexagonal head 5 and the outer wall of the expansion tube 2. Figure 1 and 2 As shown, the inclined portion 9 is inclined toward the second external hexagonal head 5, that is, an obtuse angle is formed between the inclined portion 9 and the conical portion 7 of the expansion tube 2, leaving a gap below the external hexagonal head, so that it is convenient to use a tool to pry the second external hexagonal head 5 and the expansion tube 2 out from the gap to remove the expansion tube 2. Preferably, there are two inclined portions 9, which are respectively located at the lower edges of two opposite sides of the six sides of the second external hexagonal head 5.

[0022] In this embodiment, a gasket 10 is sleeved on the expansion tube 2 near one end of the second external hexagonal head 5, and a plurality of ridges 11 are provided on the circumferential outer wall of this end of the expansion tube 2. The ridges 11 are straight lines along the axial direction of the expansion tube 2. Preferably, there are three to six ridges 11, and the ridges 11 are used to increase the friction between the expansion tube 2 and the inner wall of the hole.

[0023] The working principle of the utility model is: when installing, after the tail of the screw rod 1 is inserted into the inner hole of the expansion tube 2, the external thread 4 is introduced into the internal thread 6, and the two are threadedly connected, the conical part 7 at the tail of the expansion tube 2 expands outwards and is fastened with the hole of the fixed body, and the first external hexagonal head 3 is tightened with a tool to complete the installation. When removing, the first external hexagonal head 3 is reversed, the screw rod 1 is removed, and then a pointed or flat-headed small tool is used to pry into the notch of the inclined part 9 under the second external hexagonal head 5 and pry outwards, so that the expansion tube 2 can be pulled out and continued to be used.

[0024] The double external hexagonal reusable expansion screw of the present application has an internal thread 6 that replaces the nut and a hollow cone designed on the same expansion tube 2, so that the extension and tension forces are integrated. When the screw 1 is in use, the slightly raised convex strips 11 around the circle of the expansion tube 2 play a role in increasing the friction force. At the same time, the screw head can also be clamped with a tool, moved inward, and approached the conical part 7 of the hollow cone to expand and lock the expansion tube 2. Combined with the close combination of the screw 1, the expansion tube 2 and the hole wall, the expansion screw is more stable. At the same time, the second external hexagonal head 5 is always in close contact with the surface of the hole, making it beautiful. When the first external hexagonal head 3 is unscrewed in the opposite direction, the screw 1 can be removed, and then a pointed or flat-headed small tool is inserted into the notch of the inclined part 9 under the second external hexagonal head 5 to pry out, and the expansion tube 2 can be easily pulled out for continued use.

[0025] In summary, although the present invention has been disclosed as above in terms of preferred embodiments, the above preferred embodiments are not intended to limit the present invention. A person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined in the claims.

Claims

1. A double hexagon head expansion screw, characterized in that: The invention comprises a screw rod (1) and an expansion tube (2), wherein one end of the screw rod (1) is provided with a first external hexagonal head (3), and the screw rod (1) near the end of the first external hexagonal head (3) is provided with an external thread (4), the outer wall of one end of the expansion tube (2) is sleeved with a second external hexagonal head (5), and the inner wall of the expansion tube (2) near the end of the second external hexagonal head (5) is provided with an internal thread (6), and the internal thread (6) is threadedly connected with the external thread (4), and the expansion tube (2) is provided with a conical portion (7) at the end away from the second external hexagonal head (5), the inner diameter of the conical portion (7) is smaller than the outer diameter of the screw rod (1), and the conical portion (7) has a plurality of straight seams (8).

2. A double hexagon head expansion screw according to claim 1, characterized in that: An inclined portion (9) is provided between the lower edge of the second external hexagonal head (5) and the outer wall of the expansion tube (2), and the inclined portion (9) is inclined toward the second external hexagonal head (5).

3. A double hexagon head expansion screw according to claim 2, characterized in that: There are two inclined portions (9), which are respectively arranged at the lower edges of two opposite sides of the second external hexagonal head (5).

4. The double hexagon head expansion screw according to claim 1, characterized in that: A plurality of convex strips (11) are provided on the circumferential outer wall of the expansion tube (2) near one end of the second external hexagonal head (5), and the convex strips (11) are straight lines along the axial direction of the expansion tube (2).

5. A double hexagon head expansion screw according to claim 4, characterized in that: A gasket (10) is provided on the outer sleeve of the expansion tube (2), and the gasket (10) is arranged between the second external hexagonal head (5) and the convex strip (11).

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