Lug clamping type self drilling screw

Abstract

A clamping lug type self drilling screw is provided with a screw head, an upper thread section, a clamping lug section, a lower thread section and a drill tail, the clamping lug section is provided with a plurality of clamping lugs, the screw head, the upper thread section, the clamping lug section, the lower thread section and the drill tail are sequentially arranged, and the length of the clamping lugs is equal to that of the clamping lug section. According to the lug clamping type self drilling screw, due to the fact that the lug clamping section is located between the upper thread section and the lower thread section, when the upper thread section and the lower thread section enter a workpiece for tapping, the lug clamping section can keep perpendicular, and therefore the quality of the whole tapping process is guaranteed.

Description

Technical Field

[0001] The utility model relates to a fastener, in particular to an ear-clamping type self-drilling screw. Background Art

[0002] The clip-on drill screw is a screw with threads, clips and drill tails, which has the functions of drilling and tapping. The drill tail is used for drilling operations; the clips are used to keep the screw perpendicular to the workpiece surface and can also be used for hole expansion; the threads are used for tapping to fix the screw to the workpiece.

[0003] However, most of the existing clamping ear type self-drilling screws have the clamping ear set between the thread and the drill tail. For clamping ear type self-drilling screws with longer thread sections, when the thread at the upper end is being tapped, the clamping ear may have already withdrawn from the workpiece, and the screw cannot continue to be kept in a vertical state, thereby failing to ensure the quality of the entire tapping process. Utility Model Content

[0004] The technical solution of the utility model is aimed at the above situation. In order to solve the above problem, a clamping ear type self-drilling screw is provided, which comprises a screw head, an upper thread section, a clamping ear section, a lower thread section and a drill tail. The clamping ear section has a plurality of clamping ears. The screw head, the upper thread section, the clamping ear section, the lower thread section and the drill tail are arranged in sequence. The length of the clamping ear is equal to the length of the clamping ear section.

[0005] Furthermore, the length of the lower thread segment is greater than the length of the upper thread segment.

[0006] Furthermore, the length of the upper thread section is 18 to 22 mm, the length of the clamping ear section is 4 to 4.6 mm, the length of the lower thread section is 48 to 52 mm, and the length of the drill tail is 18 to 22 mm.

[0007] Furthermore, the ear-clamp type self-drilling screw also has a flange, which is located between the screw head and the upper threaded section, and the diameter of the flange is larger than the major diameter of the upper threaded section.

[0008] Furthermore, the ear-clamping drill screw also has: a plurality of chip removal grooves, and the chip removal grooves extend from the bottom of the drill tail to the lower thread section.

[0009] After adopting the above technical solution, the beneficial effects of the utility model are:

[0010] 1. For the clamping ear type self-drilling screw of the utility model, since the clamping ear section is located between the upper thread section and the lower thread section, the clamping ear section can play a role in keeping the upper thread section and the lower thread section vertical when entering the workpiece for tapping, thereby ensuring the quality of the entire tapping process.

[0011] 2. Since the length of the clamping ear is equal to the length of the clamping ear section, the clamping ear can enter the workpiece immediately after the lower thread section, quickly correct the posture of the clamping ear type self-drilling screw, and at the same time ensure that the clamping ear is still inside the screw hole when the upper thread section enters the screw hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the ear-clamping self-drilling screw. DETAILED DESCRIPTION

[0013] The technical solution of the utility model is further described below by way of embodiments:

[0014] The utility model provides an ear-clamping self-drilling screw, such as Figure 1 As shown, the ear-clamping drill screw comprises a screw head 1, an upper threaded section 2, an ear-clamping section 3, a lower threaded section 4 and a drill tail 5, the ear-clamping section 3 has a plurality of ears 30, the screw head 1, the upper threaded section 2, the ear-clamping section 3, the lower threaded section 4 and the drill tail 5 are arranged in sequence, and the length of the ear 30 is equal to the length of the ear-clamping section 3.

[0015] When using the ear-clamping self-drilling screw, the screw head 1 is used to cooperate with a screwdriver to perform the screwing operation; the drill tail 5 is used to drill a hole on the workpiece to form the prototype of the screw hole; the upper thread section 2 and the lower thread section 4 are used for tapping operations; the ear 30 of the ear-clamping section 3 is used to keep the ear-clamping self-drilling screw in a vertical state with the workpiece surface, and can also perform the hole expansion operation.

[0016] In the present invention, since the clamping ear section 3 is located between the upper thread section 2 and the lower thread section 4, the clamping ear section 3 can maintain verticality when the upper thread section 2 and the lower thread section 4 enter the workpiece for tapping, thereby ensuring the quality of the entire tapping process. In addition, since the length of the clamping ear 30 is equal to the length of the clamping ear section 3, the clamping ear 30 can enter the workpiece immediately after the lower thread section 4, quickly correct the posture of the clamping ear type self-drilling screw, and at the same time ensure that when the upper thread section 2 enters the screw hole, the clamping ear 30 is still inside the screw hole.

[0017] In this embodiment, there are a plurality of clamping ears 30 , and the plurality of clamping ears 30 are evenly arranged around the axis of the clamping ear type self-drilling screw.

[0018] Specifically, the length L3 of the lower thread segment 4 is greater than the length L1 of the upper thread segment 2. When the lower thread segment 4 is tapped into the workpiece, a large amount of debris is accumulated inside the screw hole of the workpiece. At this time, the clamping ear 30 performs a hole expansion operation on the screw hole, so that the screw hole has more space to accommodate the debris, ensuring the smoothness of the tapping of the upper thread segment 2 and the lower thread segment 4.

[0019] More specifically, the length L1 of the upper thread section 2 is 18-22 mm, the length L2 of the clamping ear section 3 is 4-4.6 mm, the length L3 of the lower thread section 4 is 48-52 mm, and the length L4 of the drill tail 5 is 18-22 mm.

[0020] Specifically, the ear-clamping self-drilling screw further comprises: a flange 6, the flange 6 is located between the screw head 1 and the upper thread segment 2, and the diameter of the flange 6 is greater than the major diameter of the upper thread segment 2. The major diameter of the upper thread segment 2 refers to the diameter of the top teeth of the thread; the flange 6 can be provided to press the plate tightly and prevent impurities from entering the through hole of the plate.

[0021] Specifically, the ear-type drilling screw also has: a plurality of chip removal grooves 7, which extend from the bottom of the drilling tail 5 to the lower thread section 4. The chip removal grooves 7 can be provided to discharge debris during drilling and improve the fluency of drilling. In this embodiment, there are a plurality of chip removal grooves 7, and the plurality of chip removal grooves 7 are evenly arranged around the axis of the ear-type drilling screw.

Claims

1. A clamping ear type self-drilling screw, comprising a screw head, an upper thread section, a clamping ear section, a lower thread section and a drill tail, wherein the clamping ear section has a plurality of clamping ears, and is characterized in that: The screw head, the upper thread section, the clamping ear section, the lower thread section and the drill tail are arranged in sequence, and the length of the clamping ear is equal to the length of the clamping ear section.

2. The ear-clamping self-drilling screw according to claim 1, characterized in that: The length of the lower thread segment is greater than the length of the upper thread segment.

3. The ear-clamping self-drilling screw according to claim 2, characterized in that: The length of the upper thread section is 18-22 mm, the length of the clamping ear section is 4-4.6 mm, the length of the lower thread section is 48-52 mm, and the length of the drill tail is 18-22 mm.

4. The ear-clamping self-drilling screw according to claim 1, characterized in that: The ear-clamp type self-drilling screw also has a flange, which is located between the screw head and the upper threaded section, and the diameter of the flange is larger than the major diameter of the upper threaded section.

5. The ear-clamping self-drilling screw according to claim 1, characterized in that: The ear-clamping drill screw also has: a plurality of chip removal grooves, and the chip removal grooves extend from the bottom of the drill tail to the lower thread section.

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