Undercut tap bolt

Abstract

The utility model discloses an undercut tap bolt, which relates to the technical field of bolts, and comprises a screw rod and a thread assembly, the bottom end of the screw rod is provided with a screwing mechanism, the thread assembly is arranged on the outer wall of the screw rod, the thread assembly is used for positioning the screw rod in concrete, and the thread assembly comprises a first thread and a second thread, the first thread is spirally arranged on the outer wall of the screw rod, the second thread is spirally arranged at the end part of the screw rod, and the first thread is connected with the second thread. By means of the arrangement of the first threads and the second threads, the whole bolt is made of stainless steel except for the second threads, so that the bolt can be suitable for dark, humid and hostile environments, when the bolt is used, the second threads on the outer wall of the screw rod are screwed into concrete firstly, and the second threads on the outer wall of the screw rod are screwed into the concrete. And the second threads made of spring steel have the characteristics of high strength and high toughness, so that the bolt meets the mounting and using requirements of high-strength concrete, and the applicability of the bolt is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bolts, in particular to a bottom-cut self-tapping bolt. Background Art

[0002] A bolt is a common fastener. Self-tapping bolts are commonly used for fastening in concrete and are convenient for disassembly and can be used multiple times.

[0003] The commonly seen self-tapping bolts at present are carbon steel self-tapping bolts, which have low manufacturing costs. Carbon steel can achieve high strength through special processes to meet the usage requirements of high-strength concrete.

[0004] There are some specific places where it is not suitable to use carbon steel anchor bolts. For example, in a dark, damp and relatively harsh environment, the anchor bolts will be corroded, affecting the usage effect. Such an environment is suitable for products with better rust prevention and corrosion resistance. However, due to the characteristics of stainless steel materials, the requirements for hardness and toughness of the products cannot be achieved through special processes, resulting in the inability of stainless steel self-tapping bolts to meet the usage requirements of high-strength concrete. Therefore, we propose a bottom-cut self-tapping bolt. Content of the Utility Model

[0005] The purpose of the utility model is to provide a bottom-cut self-tapping bolt to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical scheme: A bottom-cut self-tapping bolt, comprising:

[0007] A screw rod, at the bottom end of which a screwing mechanism is provided;

[0008] A thread assembly, which is arranged on the outer wall of the screw rod. The thread assembly is used for positioning the screw rod in concrete. The thread assembly includes a first thread and a second thread. The first thread is spirally arranged on the outer wall of the screw rod, and the second thread is spirally arranged at the end of the screw rod. The first thread is connected to the second thread.

[0009] Preferably, the materials of the screw rod and the first thread are both stainless steel, and the material of the second thread is spring steel.

[0010] Preferably, the screw rod is arranged in a frustum shape, and the diameter of the screw rod gradually decreases from bottom to top. The second thread is arranged at the position of the small-diameter of the screw rod.

[0011] Preferably, the screwing mechanism includes a knob, which is arranged at the top end of the screw rod. A connecting mechanism is arranged between the screw rod and the knob. The knob can be a regular hexagon block, and an auxiliary mechanism is arranged at the bottom end of the knob.

[0012] Preferably, the auxiliary mechanism includes a slot, which is opened at the bottom end of the knob.

[0013] Preferably, the connecting mechanism includes a connecting plate. The top end of the connecting plate is fixedly connected to the bottom end of the screw rod, and the bottom end of the connecting plate is fixedly connected to the top end of the knob. A strengthening mechanism is provided at the top end of the connecting plate.

[0014] Preferably, the strengthening mechanism includes diagonal friction protrusions. The diagonal friction protrusions are provided at the top end of the connecting plate and are arranged in a circular array at the top end of the connecting plate.

[0015] The technical effects and advantages of the present utility model:

[0016] With the arrangement of the first thread and the second thread in the present utility model, the entire bolt is made of stainless steel except for the second thread, so that the bolt can be applicable to relatively harsh environments such as dark and humid places. When the bolt is in use, the second thread on the outer wall of the screw rod will be screwed into the concrete first, and the second thread made of spring steel has the characteristics of high strength and high toughness, so that the bolt meets the installation requirements of high-strength concrete and improves the applicability of the bolt. Description of the Drawings

[0017] Figure 1 It is a front structural schematic diagram of the present utility model.

[0018] In the figure: 101, screw rod; 201, first thread; 202, second thread; 301, connecting plate; 401, diagonal friction protrusion; 501, knob; 601, slot. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] The present utility model provides as Figure 1A bottom-cutting self-tapping bolt as shown includes a screw rod 101 and a thread component. A screwing mechanism is provided at the bottom end of the screw rod 101. The screwing mechanism includes a knob 501. The knob 501 is arranged at the top end of the screw rod 101. A connecting mechanism is arranged between the screw rod 101 and the knob 501. The knob 501 can be a regular hexagon block. An auxiliary mechanism is provided at the bottom end of the knob 501. The auxiliary mechanism includes a slot 601. The slot 601 is opened at the bottom end of the knob 501. The connecting mechanism includes a connecting disk 301. The top end of the connecting disk 301 is fixedly connected to the bottom end of the screw rod 101. The bottom end of the connecting disk 301 is fixedly connected to the top end of the knob 501. A strengthening mechanism is provided at the top end of the connecting disk 301. The strengthening mechanism includes a diagonal friction protrusion 401. The diagonal friction protrusion 401 is arranged at the top end of the connecting disk 301. The diagonal friction protrusion 401 is arranged in an annular array at the top end of the connecting disk 301. By fixing the knob 501 and the screw rod 101 through the connecting disk 301, the screw rod 101 can be screwed by the knob 501. Thus, through the cooperation of the thread component, the screw rod 101 is screwed into the concrete for fixation. The regular hexagon block-shaped knob 501 facilitates turning the screw rod 101 by using a wrench to hold the knob 501. At the same time, due to the setting of the slot 601, the slot 601 can be a cross-shaped slot. Thus, a cross-shaped screwdriver or a flat screwdriver can be inserted into the slot 601 to turn the screw rod 101, thereby improving the convenience of using the screw rod 101. After the screw rod 101 is completely screwed into the concrete by turning the knob 501, the diagonal friction protrusion 401 at the top end of the connecting disk 301 can abut against the surface of the concrete, thereby increasing the friction between the connecting disk 301 and the concrete surface. Thus, the screw rod 101 screwed into the concrete is not likely to loosen, thereby improving the stability of the bolt during use.

[0021] In a preferred embodiment, a thread assembly is arranged on the outer wall of the screw rod 101. The thread assembly is used for positioning the screw rod 101 in concrete. The thread assembly includes a first thread 201 and a second thread 202. The first thread 201 is spirally arranged on the outer wall of the screw rod 101, and the second thread 202 is spirally arranged at the end of the screw rod 101. The first thread 201 is connected to the second thread 202. The materials of the screw rod 101 and the first thread 201 are both stainless steel, and the material of the second thread 202 is spring steel. The entire bolt, except for the second thread 202, is made of stainless steel material, so that the bolt can be applied to relatively harsh environments such as dark and humid conditions. When the bolt is in use, the second thread 202 on the outer wall of the screw rod 101 will be screwed into the concrete first. The second thread 202 made of spring steel has the characteristics of high strength and high toughness, so that the bolt meets the installation and use requirements of high-strength concrete, improving the applicability of the bolt. In the actual preparation of the bolt of the present application, the product is first made of stainless steel material, and then the threads of the front three turns of the product are removed. The three turns of spring steel threads used for replacement are fixed on the outer wall of the screw rod 101 and fixed to the remaining first thread 201 by laser welding, and the bolt of the present application can be obtained.

[0022] Wherein, the screw rod 101 is arranged in a frustum shape, and the diameter of the screw rod 101 gradually decreases from bottom to top. The second thread 202 is arranged at the position of the small-diameter of the screw rod 101. The frustum-shaped screw rod 101 enables the bolt to be screwed into the concrete, so that the thinner end of the bolt enters the concrete first. Since the hole formed by the thinner part screwed into the concrete is smaller, the bolt screwed into the concrete subsequently will enlarge the hole again. After the bolt is completely screwed into the concrete, the inner wall of the hole in contact with the outer wall of the bolt is the size matching the position of the bolt at this time, so that the bolt can be screwed into the concrete more stably, thus improving the stability of the bolt during use.

[0023] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bottom-cut self-tapping screw, characterized in that, Comprising: A screw rod (101), with a screwing mechanism provided at the bottom end of the screw rod (101); A thread component, which is arranged on the outer wall of the screw rod (101). The thread component is used for positioning the screw rod (101) in concrete. The thread component includes a first thread (201) and a second thread (202). The first thread (201) is spirally arranged on the outer wall of the screw rod (101), the second thread (202) is spirally arranged at the end of the screw rod (101), and the first thread (201) is connected to the second thread (202).

2. The bottom-cut self-tapping screw according to claim 1, wherein, The materials of the screw rod (101) and the first thread (201) are both stainless steel, and the material of the second thread (202) is spring steel.

3. The undercut self-tapping screw according to claim 1, wherein The screw rod (101) is arranged in a frustum shape, and the diameter of the screw rod (101) gradually decreases from bottom to top. The second thread (202) is arranged at the position of the small-diameter of the screw rod (101).

4. The undercut self-tapping bolt according to claim 1, wherein The screwing mechanism includes a knob (501), which is arranged at the top end of the screw rod (101). A connecting mechanism is arranged between the screw rod (101) and the knob (501). The knob (501) can be a regular hexagonal block, and an auxiliary mechanism is arranged at the bottom end of the knob (501).

5. A bottom-cut self-tapping screw according to claim 4, characterized in that The auxiliary mechanism includes a slot (601), which is opened at the bottom end of the knob (501).

6. The undercut self-tapping screw according to claim 4, wherein The connecting mechanism includes a connecting disc (301). The top end of the connecting disc (301) is fixedly connected to the bottom end of the screw rod (101), the bottom end of the connecting disc (301) is fixedly connected to the top end of the knob (501), and a strengthening mechanism is arranged at the top end of the connecting disc (301).

7. The undercut self-tapping screw according to claim 6, characterized in that, The strengthening mechanism includes a slant friction protrusion (401), which is arranged at the top end of the connecting disc (301). The slant friction protrusions (401) are arranged in an annular array at the top end of the connecting disc (301).

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