TWI851168B - Self-tapping wall anchor structure - Google Patents

Abstract

The invention discloses a self-drilling wall anchor structure, comprising: a bolt, an expansion tube and a nut. A drill head and an expansion part are arranged at one end of the bolt, and a shank is arranged at the other end. The end of the drill head is provided with a cutting edge and a chip removal groove is arranged at the periphery. An external thread is arranged between the shank and the expansion part. The expansion tube is provided with a plurality of spirally encircling grooves to form a plurality of expansion sheets. The expansion tube is sleeved on the outer side of the bolt. A positioning means is provided between the first end of the expansion tube and the expansion portion of the bolt, so that the expansion tube can rotate synchronously with the bolt, the plurality of cut grooves are aligned and connected with the plurality of chip removal grooves of the drill head, and the nut is screwed on the outer thread of the bolt; thereby, the wall anchor can be directly drilled into the cement wall or the ground without drilling holes in the cement wall or the ground in advance, the installation operation is time-saving and labor-saving, and the practicality and convenience of use are improved.

Description

Self-tapping wall anchor structure

The present invention relates to a wall anchor, in particular to a self-tapping wall anchor structure installed on a wall or the ground to fix objects.

According to the disclosure, the wall anchor, also known as the expansion screw, is a common fastener that is inserted into a hole and uses tightening to achieve a fixing effect. It is known that the wall anchor comprises: a bolt, an expansion tube and a nut. A conical expansion portion is provided at one end of the bolt, and an external thread is provided at the other end. A plurality of grooves are provided at intervals at one end of the expansion tube, so that a plurality of expansion sheets are formed at the end of the expansion tube. The bolt is inserted into the expansion tube, and the expansion portion of the bolt is against the end of the plurality of expansion sheets of the expansion tube. The nut is screwed on the external thread of the bolt.

It is known that when installing the anchor nail, a hole is drilled on the cement wall or the ground with a drill bit, and the anchor nail is hammered into the hole in the wall or the ground. Then, the nut on the anchor nail is tightened with a wrench. While the expansion tube remains stationary, the bolt is pulled outward by the nut, so that the expansion part of the bolt enters the expansion tube, pushing the expansion sheet of the expansion tube outward, exerting a pressing force on the hole wall to complete the installation.

However, when installing the known anchor nails, holes must be drilled in the cement wall or the ground first, and the anchor nails must be driven into the holes. This not only increases the installation time and steps, but also makes the installation work time-consuming and labor-intensive. In addition, the installation process is prone to the inappropriate size (depth or diameter) of the drilled hole, resulting in insufficient force for the anchor nail to fix or the anchor nail not being able to fit into the drilled hole, which is quite inconvenient to use.

The inventor of the present invention, in view of the above-mentioned shortcomings of the known gecko nails, came up with the idea of creating a novel invention. After much discussion and trial production of samples, as well as many revisions and improvements, the present invention was launched.

The present invention provides a self-drilling wall anchor structure, comprising: a bolt, a drill head portion is arranged at one end, and a shank portion is arranged at the other end, the drill head portion is non-circular, and a cutting edge portion is arranged at the end and a chip removal groove is arranged at the periphery, an expansion portion is connected to an end of the drill head portion toward the shank portion, and an external thread is arranged between the shank portion and the expansion portion; an expansion tube, having a first end and a second end, and the expansion tube is provided with a plurality of spirally encircling grooves from the first end to the second end, and the grooves are arranged in a spiral manner. The spiral direction of the groove is opposite to the rotation direction of the drill hole of the drill head, and a plurality of expansion sheets are formed between each of the grooves. The expansion tube is sleeved on the outer side of the bolt, the first end of the expansion tube is against the expansion support portion of the bolt, and a positioning means is provided between the first end of the expansion tube and the expansion support portion of the bolt, so that the expansion tube can rotate synchronously with the bolt and the plurality of grooves are aligned and connected with the plurality of chip removal grooves of the drill head; and a nut is screwed on the outer thread of the bolt.

The main purpose of the self-drilling wall anchor structure of the present invention is that the wall anchor can be directly drilled into a cement wall or the ground without drilling holes in the cement wall or the ground first, thereby reducing the time and steps for installing the wall anchor, saving time and labor in the installation operation, and avoiding the problem of insufficient force for fixing the wall anchor or the wall anchor failing to fit into the drilled hole due to inappropriate size of the drilled hole, thereby improving practicality and ease of use.

The following is a further description of the preferred embodiments of the present invention in conjunction with the drawings, so that those familiar with the relevant technology of the present invention can implement it according to the description of this specification.

First, please refer to the first to sixth figures, the self-drilling wall anchor structure of the present invention includes: a bolt 10, an expansion tube 20 and a nut 30.

A drill head portion 11 is provided at one end of the bolt 10, and a hexagonal shank portion 12 is provided at the other end. The drill head portion 11 is non-circular, and is provided with a cutting edge portion 111 at the end and a chip groove 112 at the periphery. A conical expansion portion 13 is connected to one end of the drill head portion 11 facing the shank portion 12, and an external thread 14 is provided between the shank portion 12 and the expansion portion 13. In this embodiment, two opposite chip grooves 112 are provided at the periphery of the drill head portion 11, and the external thread 14 is provided near the shank portion 12.

The expansion tube 20 has a first end 21 and a second end 22. The expansion tube 20 is provided with a plurality of spirally encircled grooves 23 from the first end 21 to the second end 22. The spiral direction of the grooves 23 is opposite to the rotation direction of the drill hole of the drill head 11, and a plurality of expansion sheets 24 are formed between the grooves 23. The expansion tube 20 is sleeved on the outer side of the bolt 10. The first end 21 of the expansion tube 20 abuts against the expansion support portion 13 of the bolt 10, and a positioning means is provided between the first end 21 of the expansion tube 20 and the expansion support portion 13 of the bolt 10, so that the expansion tube 20 can be positioned at the expansion tube 20. The expansion tube 20 can rotate synchronously with the bolt 10, and the plurality of grooves 23 are aligned with the plurality of chip removal grooves 112 of the drill head 11. In this embodiment, the expansion tube 20 is provided with two opposite grooves 23 spirally encircling from the first end 21 to the second end 22. The positioning means is to set at least one positioning protrusion 15 on the expansion part 13 of the bolt 10, and to set at least one positioning notch 25 on the first end 21 of the expansion tube 20. The positioning protrusion 15 is inserted into the positioning notch 25, so that the expansion tube 20 and the bolt 10 produce a positioning effect.

The nut 30 is screwed onto the outer thread 14 of the bolt 10 and abuts against the expansion tube 20, so that the expansion tube 20 is restricted between the expansion portion 13 of the bolt 10 and the nut 30 and cannot move.

When the anchor nail of the present invention is used, as shown in the fourth to seventh figures, the handle 12 of the bolt 10 is fixed on the electric drill 40, and the electric drill 40 is used to drive the anchor nail to rotate, and the drill head 11 of the bolt 10 is drilled into the cement wall or the ground. At the same time, the drill chips generated during the drilling process are smoothly discharged outward through the chip discharge groove 112 of the drill head 11 and the cut groove 23 of the expansion tube 20 until the expansion tube 20 is completely inserted into the cement wall or the ground. Then, the electric drill 40 and the handle 12 of the bolt 10 are rotated. Separate, tighten the nut 30 on the wall anchor with a wrench, and while the expansion tube 20 remains stationary, pull the bolt 10 outward with the nut 30, so that the expansion portion 13 of the bolt 10 enters the expansion tube 20, and the expansion sheet 24 of the expansion tube 20 is pushed outward to form an inclination. The expansion sheet 24 pushed outward to form an inclination exerts a pressing force on the hole wall, so that the wall anchor is firmly anchored to the cement wall or the ground, completing the installation of the wall anchor to fix the object.

Furthermore, as shown in FIGS. 8 to 11, another embodiment of the self-drilling wall anchor structure of the present invention is shown. The difference between the another embodiment and the above-mentioned embodiment is that the positioning means is to weld and fix the expansion portion 13 of the bolt 10 and the first end 21 of the expansion tube 20 with a welding point A1.

When in use, the drill head 11 of the bolt 10 is used to drill into the cement wall or the ground until the expansion tube 20 is completely inserted into the cement wall or the ground. Then, the nut 30 on the wall anchor is tightened with a wrench. When the expansion portion 13 of the bolt 10 and the first end 21 of the expansion tube 20 are welded and fixed, the bolt 10 is pulled outward by the nut 30. The expansion piece 24 of the expansion tube 20 is driven by the expansion portion 13 of the bolt 10 to be squeezed outward to form a U-shape, and the expansion piece 24 squeezed outward to form a U-shape exerts a pressing force on the hole wall to make the wall anchor firmly anchored on the cement wall or the ground, completing the installation action of the wall anchor to fix the object.

The structure of the above specific embodiment can obtain the following benefits:

The self-drilling anchor structure of the present invention is provided with a drill head 11, a chip removal groove 112 and a cutout 23, and can be directly drilled into a cement wall or the ground without drilling holes in the cement wall or the ground in advance. Therefore, the installation time and steps of the anchor are reduced, and the installation operation is time-saving and labor-saving. In addition, there is no risk of insufficient anchor force or the anchor failing to fit into the drilled hole due to an inappropriate size of the drilled hole, thereby improving practicality and ease of use.

10: Bolts

11: Drill head

111: cutting edge

112: Chip groove

12: Handle

13: Expansion Department

14: External thread

15: Positioning bump

20: Expansion tube

21: First End

22: Second End

23: Grooving

24: Expand the film

25: Positioning slot

30: Nut

40: Electric drill

A1: Soldering point

The first figure is a three-dimensional diagram of the present invention. The second figure is a three-dimensional exploded diagram of the present invention. The third figure is a cross-sectional diagram of the present invention. The fourth figure is a schematic diagram of the present invention drilling the wall nail into the wall (I). The fifth figure is a schematic diagram of the present invention drilling the wall nail into the wall (II). The sixth figure is a cross-sectional diagram of the wall nail of the present invention completing the drilling action. The seventh figure is a cross-sectional diagram of the wall nail of the present invention being fixed on the wall surface. The eighth figure is a three-dimensional diagram of another embodiment of the present invention. The ninth figure is a three-dimensional exploded diagram of another embodiment of the present invention. The tenth figure is a cross-sectional diagram of another embodiment of the present invention completing the drilling action of the wall nail. The eleventh figure is a cross-sectional diagram of another embodiment of the present invention installing the wall nail on the wall surface.

10: Bolts

11: Drill head

111: Cutting edge

112: Chip groove

12: Handle

13: Expansion Department

14: External thread

15: Positioning bump

20: Expansion tube

21: First end

22: Second end

23: Grooving

24: Expand the film

25: Positioning slot

30: Nut

Claims (5)

A self-drilling wall anchor structure, comprising: A bolt, with a drill head at one end and a shank at the other end, the drill head is non-circular, with a cutting edge at the end and a chip removal groove at the periphery, a support portion connected to one end of the drill head toward the shank, and an external thread is provided between the shank and the support portion; An expansion tube has a first end and a second end. The expansion tube is provided with a plurality of spirally encircling grooves from the first end to the second end. The spiral direction of the grooves is opposite to the rotation direction of the drill hole of the drill head, and a plurality of expansion sheets are formed between the grooves. The expansion tube is sleeved on the outer side of the bolt. The first end of the expansion tube abuts against the expansion support of the bolt, and a positioning means is provided between the first end of the expansion tube and the expansion support of the bolt, so that the expansion tube can rotate synchronously with the bolt and the plurality of grooves are aligned and connected with the plurality of chip removal grooves of the drill head; and a nut is screwed on the outer thread of the bolt. As described in claim 1, the self-tapping wall anchor structure, wherein the positioning means is to set at least one positioning protrusion on the expansion portion of the bolt, and to set at least one positioning groove on the first end of the expansion tube, and the positioning protrusion is inserted into the positioning groove, so that the expansion tube and the bolt produce a positioning effect. A self-tapping wall anchor structure as described in claim 1, wherein the positioning means is to fix the expansion portion of the bolt and the first end of the expansion tube by welding with a weld spot. A self-tapping wall anchor structure as described in claim 1, wherein the handle is hexagonal and the expansion portion is conical. A self-tapping wall anchor structure as described in claim 1, wherein the external thread is arranged near the handle.

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