Hardwood self-tapping screw

Abstract

The utility model discloses a hardwood self-tapping screw which comprises a screw rod body, a nut is arranged at the front end of the screw rod body, a self-tapping pointed end is arranged at the rear end of the screw rod body, the self-tapping pointed end is in a flat cone shape, self-tapping threads are arranged on the outer surface of the screw rod body, the self-tapping pointed end comprises a piercing part and a leading-in part, and the piercing part is connected with the leading-in part. The guide-in part comprises two first conical inclined surfaces which are bilaterally symmetrical and two second conical inclined surfaces which are bilaterally symmetrical; and flat edged parts are formed at the intersection parts of the first conical inclined surfaces and the second conical inclined surfaces. By means of the mode, the hardwood self-tapping screw can generate higher concentrated pressure and impact force, can enter a hardwood workpiece more easily, is more labor-saving, improves drilling penetrating power, can bear more uniform pressure distribution, and improves drilling self-tapping efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a hardwood self-tapping screw. Background Art

[0002] Self-tapping screws are screws with sharp threads and self-drilling tips, mainly used for fastening non-metallic or softer metal materials.

[0003] The working principle of self-tapping screws is based on their threads and tips. When the screw is screwed into the material, its sharp tip forms an initial cutting point on the material, and then as the screw rotates, the threaded part forms a matching thread structure in the material to ensure a tight fit between the screw and the material.

[0004] The pointed head of traditional self-tapping screws often encounters greater difficulties and resistance when used on hard wood, and the impact force and penetration force are poor, which makes the drilling and self-tapping process labor-intensive and affects efficiency. Utility Model Content

[0005] The main technical problem solved by the utility model is to provide a hardwood self-drilling screw, which can generate higher concentrated pressure and impact force, can enter the hardwood workpiece more easily, save more labor, improve the drilling penetration force, can withstand more uniform pressure distribution, and improve the drilling self-drilling efficiency.

[0006] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a hardwood self-tapping screw, including a screw body, the front end of the screw body has a nut, the rear end of the screw body has a self-tapping tip, the self-tapping tip is in the shape of a flat cone, the outer surface of the screw body has a self-tapping thread,

[0007] The self-tapping tip comprises a piercing portion and an introduction portion, wherein the introduction portion comprises two left-right symmetrical first conical inclined surfaces and two left-right symmetrical second conical inclined surfaces, and a flat blade portion is formed at the intersection of the first conical inclined surfaces and the second conical inclined surfaces.

[0008] In a preferred embodiment of the present invention, the nut is in a truncated cone shape and has a countersunk hole in a plum blossom shape.

[0009] In a preferred embodiment of the present invention, the outer surface of the screw body has a first self-tapping thread segment near the nut side, and the outer surface of the screw body has a second self-tapping thread segment near the self-tapping tip side. The middle part of the outer surface of the screw body is a smooth cylindrical shape, and the length of the second self-tapping thread segment is greater than the length of the first self-tapping thread segment.

[0010] In a preferred embodiment of the present invention, the piercing portion forms an acute angle, and the acute angle ranges from 20 to 60 degrees.

[0011] In a preferred embodiment of the present invention, there are two cutting edges, and the cutting edges of the two cutting edges face opposite directions.

[0012] In a preferred embodiment of the present invention, the cutting edge of each cutting portion forms an obtuse angle, and the obtuse angle ranges from 100 to 150°.

[0013] In a preferred embodiment of the present invention, the screw body is made of stainless steel.

[0014] The beneficial effects of the utility model are: it can generate higher concentrated pressure and impact force, can enter hardwood workpieces more easily, and save more effort; the drilling and self-tapping process is fast and efficient, the drilling penetration force is improved, the pressure that can be tolerated is more evenly distributed, and the drilling and self-tapping efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a preferred embodiment of the hardwood self-tapping screw of the utility model;

[0017] Figure 2 It is a top view of a preferred embodiment of the hardwood self-tapping screw of the utility model;

[0018] Figure 3 It is a bottom view of a preferred embodiment of the hardwood self-tapping screw of the utility model;

[0019] Figure 4 It is a left view of a preferred embodiment of the hardwood self-tapping screw of the utility model;

[0020] Figure 5 It is a right side view of a preferred embodiment of the hardwood self-tapping screw of the utility model;

[0021] The markings of the components in the accompanying drawings are as follows:

[0022] 100. Screw body, 110. Nut, 111. Countersunk hole, 120. Self-tapping pointed head, 121. Insertion portion, 122. Introduction portion, 1221. First conical inclined surface, 1222. Second conical inclined surface, 1223. Blade portion, 130. First thread segment, 140. Second thread segment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] The utility model relates to a preferred embodiment of a hardwood self-tapping screw.

[0026] See also Figures 1 to 5 The hardwood self-tapping screw includes: a screw body 100, a nut 110 at the front end of the screw body 100, a self-tapping tip 120 at the rear end of the screw body 100, the self-tapping tip 120 is in the shape of a flat cone, and the outer surface of the screw body 100 has a self-tapping thread.

[0027] In an exemplary embodiment, the nut 110 is in a truncated cone shape, and a countersunk hole 111 is provided on the top of the nut 110 , and the countersunk hole 111 is in a plum blossom shape.

[0028] In an exemplary embodiment, the outer surface of the screw body 100 has a first thread segment 130 near the nut 110 side, and the outer surface of the screw body 100 has a second thread segment 140 near the self-tapping tip 120 side. The middle part of the outer surface of the screw body 100 is a smooth cylindrical shape, and the length of the second thread segment 140 is greater than the length of the first thread segment 130.

[0029] The first thread segment 130 and the second thread segment 140 are configured to be screwed in directly after the self-tapping tip 120 cuts in, thereby forming a stable thread structure and ensuring a tight fit with the hardwood.

[0030] In an exemplary embodiment, the self-tapping tip 120 includes a piercing portion 121 and an introduction portion 122 .

[0031] When drilling, the piercing portion 121 is first pre-positioned to the drilling position, and then force is applied to screw the hardwood workpiece through the piercing portion. In this process, the introduction portion 122 can play a drilling assisting effect, helping the screw to drill the hole more easily.

[0032] The piercing portion 121 forms an acute angle. Preferably, the acute angle ranges from 20 to 60 degrees. The tip angle within this range can generate higher concentrated pressure and impact force, making it easier to enter the hardwood workpiece and more labor-saving.

[0033] In an exemplary embodiment, the introduction portion 122 includes two left-right symmetrical first conical inclined surfaces 1221 and two left-right symmetrical second conical inclined surfaces 1222 , and a flat edge portion 1223 is formed at the intersection of the first conical inclined surfaces 1221 and the second conical inclined surfaces 1222 .

[0034] Further, the number of the blade portions 1223 is two, and the blade edges of the two blade portions 1223 face oppositely. In this way, when the piercing portion is screwed into the hardwood workpiece, the two blade portions 1223 are driven to start rotating, thereby increasing the penetration force.

[0035] Furthermore, the edge of each cutting portion 1223 forms an obtuse angle. Preferably, the obtuse angle ranges from 100 to 150 degrees. The edge angle within this range has a larger contact area with the workpiece, ensuring that the pressure that can be borne during the drilling process is more evenly distributed, thereby improving the drilling self-drilling efficiency.

[0036] The nut 110, the screw body 100 and the self-tapping tip 120 are made of stainless steel, which ensures the high strength and good toughness of the self-tapping screw, can withstand greater pressure and impact, and has good penetration when drilling.

[0037] The beneficial effects of the hardwood self-tapping screw of the utility model are:

[0038] It can generate higher concentrated pressure and impact force, making it easier to enter hardwood workpieces and saving effort;

[0039] The drilling process is fast and efficient, the penetration is improved, the pressure that can be tolerated is more evenly distributed, and the drilling efficiency is improved.

[0040] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A hardwood self-tapping screw, characterized in that: include: The screw body has a nut at the front end and a self-tapping tip at the rear end. The self-tapping tip is in the shape of a flat cone. The outer surface of the screw body has a self-tapping thread. The self-tapping tip comprises a piercing portion and an introduction portion, wherein the introduction portion comprises two left-right symmetrical first conical inclined surfaces and two left-right symmetrical second conical inclined surfaces, and a flat blade portion is formed at the intersection of the first conical inclined surfaces and the second conical inclined surfaces.

2. The hardwood self-tapping screw according to claim 1, characterized in that: The nut is in a truncated cone shape and is provided with a countersunk hole in a plum blossom shape.

3. The hardwood self-tapping screw according to claim 1, characterized in that: The outer surface of the screw body has a first self-tapping thread section near the nut side, and the outer surface of the screw body has a second self-tapping thread section near the self-tapping tip side. The middle part of the outer surface of the screw body is a smooth cylindrical shape, and the length of the second self-tapping thread section is greater than the length of the first self-tapping thread section.

4. The hardwood self-tapping screw according to claim 1, characterized in that: The piercing portion forms an acute angle, and the acute angle ranges from 20 to 60 degrees.

5. The hardwood self-tapping screw according to claim 1, characterized in that: There are two cutting edges, and the cutting edges of the two cutting edges face in opposite directions.

6. The hardwood self-tapping screw according to claim 1, characterized in that: The cutting edge of each cutting edge forms an obtuse angle, and the obtuse angle ranges from 100 to 150 degrees.

7. The hardwood self-tapping screw according to claim 1, characterized in that: The screw body is made of stainless steel.

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