Self-drilling screw with fins

Abstract

This invention discloses a finned drill screw, mainly composed of a shank, a screw head, a drill tail, and at least one fin. The outer surface of the shank is provided with threads. The at least one fin is located on the shank near the drill tail and is situated on the threads. The fin includes a boss, and an auxiliary tooth is formed on the side of the boss away from the shank, and a fin is attached thereto. The auxiliary tooth and the thread form a gap-connected connection. When securing wood and metal plates, if the fin breaks off, the auxiliary tooth will be exposed, reducing the difficulty of securing and improving work efficiency. Furthermore, it can effectively prevent skewing during the drilling and locking process, ensuring the stability of the lock.

Description

[Technical Field]

[0001] This invention relates to a screw, and more particularly to a self-drilling screw with fins. [Previous Technology]

[0002] Drill screws are fasteners widely used in construction, furniture, machinery manufacturing and other fields. They have the characteristics of self-drilling and self-tapping, and are particularly suitable for simultaneously locking composite materials of soft and hard materials, such as the laminated structure of wood (or acrylic, plastic, etc.) and metal plates.

[0003] As shown in Figures 13 to 15, a conventional self-drilling screw includes: a rod body 91 with threads 911 on its outer surface; a screw head 92 disposed at one end of the rod body 91 and connected to the threads 911; a drill tail 93 disposed at the other end of the rod body 91 and also connected to the threads 911; and two convex wings 94 disposed on both sides of the rod body 91 near the drill tail 93 and located on the threads 911. The two convex wings 94 are sheet-like structures of equal thickness and are manufactured by extrusion molding, so that the rod body 91 forms a recess 912 on each side of the convex wing 94.

[0004] As shown in Figures 16 to 19, when used to lock and fix the wood 70 to the metal plate 80, the drill tail 93 abuts against the surface of the wood 70, applying rotational force to the screw head 92, driving the drill tail 93 to drill a hole in the wood 70, forming a locking hole 71. Simultaneously, the two protruding fins 94 follow the drill tail 93 into the locking hole 71 to enlarge the hole, ensuring that the screw thread 911 can smoothly enter the locking hole 71. When the drill tail 93 penetrates the wood 70 and continues to drill into the metal plate 80, a locking hole 81 is formed. The thread 911 then taps the locking hole 81. When the two protruding wings 94 contact the metal plate 80, the two protruding wings 94 will break off due to being blocked. In this way, the thread 911 can continue to enter the locking hole 81 and lock until the screw head 92 is tightly against the wood 70, successfully fixing the wood 70 to the metal plate 80.

[0005] However, in the drilling process of this conventional self-drilling screw, when the two protruding wings 94 break off, a threadless area 913 with an included angle greater than 90 degrees will be formed at the break point. This makes tapping require a lot of force, which not only increases the difficulty of locking, but also prolongs the time required for locking and reduces the overall work efficiency. In addition, after the two protruding wings 94 break off, the original protruding wing 94 loses its circumferential support, so that only the thread 911 is in contact with the circumference of the drill hole at two symmetrical points on the circumference. The lack of complete circumferential support makes the self-drilling screw prone to skew during the tapping process. This not only affects the stability of locking, but may also cause potential safety hazards. [Summary of the Invention]

[0006] In view of the above-mentioned problems to be solved, the inventor came up with the idea of ​​creation, and after extensive research, trial production and testing, and multiple revisions and improvements, finally launched this invention.

[0007] The present invention provides a drill tail screw with a fin, comprising: a rod body having threads on its outer surface; a screw head disposed at one end of the rod body; a drill tail disposed at the other end of the rod body; and at least one fin disposed on the rod body near the drill tail and located on the threads. The rod body forms a recess on each side of the fin. The fin includes a thicker boss. An auxiliary tooth is formed on the side of the boss away from the rod body and a thinner fin is attached thereon. The shape of the auxiliary tooth corresponds to the thread, and the auxiliary tooth and the thread form a gap-connected connection.

[0008] The main purpose of the self-drilling screw with convex fins of the present invention is that, during the process of locking wood and metal plates, when the fins break off, the auxiliary teeth on the convex seat will be exposed, thereby reducing the difficulty of locking, shortening the force and time required for locking, and improving the overall work efficiency.

[0009] Another objective of the drill tail screw with convex fins of the present invention is that it can effectively prevent skewing during the drilling process, ensure the stability of the lock, and avoid potential safety hazards.

Implementation Method

[0010] The following description, in conjunction with the drawings of the preferred embodiments of the present invention, is intended to enable those skilled in the art to implement the invention based on the statements in this specification.

[0011] First, as shown in Figures 1 to 3, the drill tail screw of the present invention with fins includes: a rod body 10, a screw head 20, a drill tail portion 30 and at least one fin 40.

[0012] The rod body 10 is in the shape of a round rod, and the outer surface is provided with threads 11.

[0013] The screw head 20 is located at one end of the rod body 10 and is connected to the screw thread 11.

[0014] The drill tail 30 is located at the other end of the rod body 10 and is also connected to the thread 11. The drill tail 30 has a drill body 31 connected to the rod body 10, a drill bit 32 formed at the end of the drill body 31, two chip removal grooves 33 respectively opened on the drill body 31 and dividing the drill bit 32 into two opposite sides, and cutting edges 34 respectively formed at the junction of the chip removal grooves 33 and the drill body 31.

[0015] At least one fin 40 is disposed on the rod body 10 near the drill tail 30 and located on the thread 11. The rod body 10 forms a recess 12 on each side of the fin 40. Threads 11 are provided between the at least one fin 40 and the screw head 20 and between the fin 40 and the drill tail 30. The fin 40 includes a relatively thick boss 41. An auxiliary tooth 411 is formed on the side of the boss 41 away from the rod body 10, and a relatively thick tooth is connected to it. The thin fin 42, the auxiliary tooth 411 is shaped to correspond to the threaded tooth 11, and the auxiliary tooth 411 and the threaded tooth 11 form a gap connection. In this embodiment, the number of at least one convex fin 40 is two. The two convex fins 40 are disposed on both sides of the rod body 10 near the drill tail 30, and the two convex fins 40 are disposed opposite each other. The thickness of the boss 41 is greater than the thickness of the fin 42, and the fin 42 is connected to the middle position of the thickness of the boss 41.

[0016] As shown in Figures 4 and 5, when used to lock and fix wood 70 (or other soft materials such as acrylic, plastic, etc.) to metal plate 80 (or other hard materials), the drill tail 30 is first placed against the surface of the wood 70, and then a rotational force is applied to the screw head 20 to drive the drill tail 30 to drill a hole in the wood 70. The drill bit 32 and the cutting edge 34 perform drilling and cutting actions, and the generated chips are discharged through the chip removal groove 33 to form a locking hole 71. At the same time, the fin 42 follows the drill tail 30 into the locking hole 71 to enlarge the hole, ensuring that the thread 11 can smoothly enter the locking hole 71. When the drill tail 30 penetrates the wood 70 and continues to drill into the metal plate 80, a locking hole 81 is formed, and the thread 11 then taps the locking hole 81.

[0017] When the fin 42 contacts the metal plate 80, as shown in Figures 6 to 8, the fin 42 will break off due to being blocked, causing the auxiliary tooth 411 on the protrusion 41 to be exposed. The auxiliary tooth 411 and the threaded tooth 11 are connected in a gap to avoid the appearance of a threadless area with an angle of more than 90 degrees, thereby ensuring that it can be smoothly and continuously driven into the locking hole 81 for locking until the screw head 20 is tightly against the wood 70, successfully fixing the wood 70 to the metal plate 80, and completing the drilling and locking operation.

[0018] Furthermore, as shown in Figure 9, this is another embodiment of the self-drilling screw with convex fins of the present invention. The difference between this other embodiment and the above embodiment is that the number of at least one convex fin 40 is two, and the two convex fins 40 are staggered.

[0019] As shown in Figure 10, this is another embodiment of the drill tail screw with convex fins of the present invention. The difference between this embodiment and the above embodiment is that the number of at least one convex fin 40 is one, which is disposed on the side of the rod body 10 near the drill tail 30.

[0020] As shown in Figures 11 and 12, this is another embodiment of the self-drilling screw with convex fins of the present invention. The difference between this embodiment and the above embodiment is that the convex fin 40 includes a thicker boss 41. A thinner fin 42 is formed on the side of the boss 41 away from the rod 10. The thickness of the boss 41 is greater than the thickness of the fin 42. The fin 42 is located at the middle position of the thickness of the boss 41. The distance from the joint of the boss 41 and the fin 42 to the center of the rod 10 is equal to the distance from the groove of the thread 11 to the center of the rod 10.

[0021] The following benefits can be obtained from the structure of the above specific embodiments:

[0022] 1. The present invention provides a finned self-drilling screw, wherein the shank 10 is provided with at least one fin 40 near the drill tail 30, the fin 40 is located on the thread 11, the fin 40 includes a boss 41, the boss 41 has an auxiliary tooth 411 formed on the side away from the shank 10, and a fin 42 is connected thereto. During the locking process of wood 70 and metal plate 80, when the fin 42 breaks and falls off, the auxiliary tooth 411 on the boss 41 will be exposed, forming a gap connection with the thread 11, thereby effectively reducing the difficulty of locking, shortening the force and time required for locking, and improving the overall work efficiency.

[0023] 2. The present invention has a drill tail screw with a convex fin. After the fin 42 breaks off, the exposed auxiliary tooth 411 and the threaded tooth 11 form a gap-free connection. The convex seat 41 and the auxiliary tooth 411 can provide support with contact with the circumference of the drill hole from the top, bottom, left and right. This can effectively prevent the skew phenomenon during the drilling process, thereby ensuring the stability of the lock and avoiding potential safety hazards. [Simplified Explanation of the Diagram]

[0024] Figure 1 is a perspective view of the finned self-drilling screw of the present invention. Figure 2 is a partial plan view of the finned self-drilling screw of the present invention. Figure 3 is a cross-sectional view along line AA of Figure 2. Figure 4 is a schematic diagram of drilling and reaming using the finned self-drilling screw of the present invention. Figure 5 is a schematic diagram of the finned self-drilling screw of the present invention in contact with a metal plate. Figure 6 is a schematic diagram of the finned self-drilling screw of the present invention breaking off. Figure 7 is a schematic diagram of the finned self-drilling screw of the present invention locking with a metal plate. Figure 8 is a schematic diagram of the finned self-drilling screw of the present invention completing the drill lock. Figure 9 is a partial plan view of another embodiment of the finned self-drilling screw of the present invention. Figure 10 is a partial plan view of yet another embodiment of the finned self-drilling screw of the present invention. Figure 11 is a partial plan view of yet another embodiment of the finned self-drilling screw of the present invention. Figure 12 is a schematic diagram of the finned self-drilling screw of yet another embodiment of the present invention breaking off. Figure 13 is a perspective view of a conventional self-drilling screw. Figure 14 is a partial plan view of a conventional self-drilling screw. Figure 15 is a cross-sectional view along line BB of Figure 13. Figure 16 is a schematic diagram of the conventional self-drilling screw's fin contacting the metal plate. Figure 17 is a schematic diagram of the conventional self-drilling screw's fin breaking off. Figure 18 is a schematic diagram of the conventional self-drilling screw locking with the metal plate. Figure 19 is a schematic diagram of the conventional self-drilling screw completing the drill lock.

Claims

1. A self-drilling screw with fins, comprising: a rod (10) having threads (11) on its outer surface; and a screw head (20) disposed at one end of the rod (10); A drill tail (30) is provided at the other end of the rod body (10); and at least one wing (40) is provided on the rod body (10) near the drill tail (30) and located on the thread (11). The rod body (10) forms a recess (12) on both sides of the wing (40). The wing (40) includes a thicker boss (41). An auxiliary tooth (411) is formed on the side of the boss (41) away from the rod body (10), and a thinner fin (42) is attached thereon. The shape of the auxiliary tooth (411) corresponds to the thread (11), and the auxiliary tooth (411) and the thread (11) are connected in a gap.

2. The finned drill screw as described in claim 1, wherein the number of the at least one fin (40) is two, and the two fins (40) are disposed on both sides of the rod body (10) near the drill tail (30), and the two fins (40) are disposed opposite to each other.

3. The finned screw as described in claim 1, wherein the number of at least one fin (40) is two, and they are disposed on both sides of the rod body (10) near the finned portion (30), and the two fins (40) are staggered.

4. A finned self-drilling screw as described in any one of claims 1 to 3, wherein the thickness of the boss (41) is greater than the thickness of the fin (42), and the fin (42) is disposed at the middle position of the thickness of the boss (41).

5. A self-drilling screw with fins, comprising: a rod (10) having threads (11) on its outer surface; and a screw head (20) disposed at one end of the rod (10); A drill tail (30) is provided at the other end of the rod body (10); and at least one fin (40) is provided on the rod body (10) near the drill tail (30) and located on the thread (11). The rod body (10) forms a recess (12) on each side of the fin (40). The fin (40) includes a thicker boss (41). A thinner fin (42) is formed on the side of the boss (41) away from the rod body (10). The distance from the joint of the boss (41) and the fin (42) to the center of the rod body (10) is equal to the distance from the groove of the thread (11) to the center of the rod body (10).

6. The finned drill screw as described in claim 5, wherein the number of the at least one fin (40) is two, and the two fins (40) are disposed on both sides of the rod body (10) near the drill tail (30), and the two fins (40) are disposed opposite to each other.

7. A finned drill screw as described in claim 5, wherein the number of at least one fin (40) is two, and the two fins (40) are disposed on both sides of the rod body (10) near the drill tail (30), and the two fins (40) are staggered.

8. A finned self-drilling screw as described in any one of claims 5 to 7, wherein the thickness of the boss (41) is greater than the thickness of the fin (42), and the fin (42) is disposed at the middle of the thickness of the boss (41).

Images