TW201516279A - A self-drilling screw - Google Patents

Abstract

A self-drilling screw mainly includes at least one positioning groove disposed on a drilling portion of the screw and a drilling rim formed at a connection of the positioning groove and a drill tip. The positioning groove is communicated with a chip-discharging groove of the drilling portion. By the positioning groove, the screw is in contact with an object via multiple supports for strengthening the stable positioning effect on the object. The drilling rim assists two drilling edges of the drilling portion in drilling and cutting, thereby decreasing efforts and operating time and increasing the sharpness of the drilling edges and the drilling speed to achieve the fast drilling and fastening.

Description

Self-drilling screw

The invention relates to a screw tail design, in particular to a drill tail screw.

Referring to FIG. 1 , the conventional self-drilling screw 1 includes a screw head 11 , a rod body 12 disposed on the screw head 11 and extending outwardly, and a screw opposite to the screw head 11 and disposed at the other end of the rod body 12 . a tail portion 13 and a thread 14 of a plurality of spiral rings disposed on the rod body 12; wherein the drill tail portion 13 has a drill body 131 extending outward from the rod body 12, and an outwardly extending portion of the drill body 131 And a slanted drill tail 132, at least one chip opening 133 formed on the drill body 131, the drill tail 132, and a positioning end 134 at the end edge of the drill tail 132, and the chip flute 133 is A cutting edge 135 is formed at the intersection of the drill body 131, and two cutting edges 136 are formed at the junction of the chip flutes 133 and the drill tail 132, and the drilling edges 136 are disposed on the two sides of the positioning end 134. Therefore, the positioning end 134 is in contact with the surface of the lock compound (not shown), and the rotating head 11 is applied with a rotational torque so that the drill tail 132 and the lock compound are at the rotational speed. Producing a contact to secure the fixed position, and simultaneously utilizing the cooperation of the chip flute 133 and the cutting edge 135 to drill the wall surface of the lock compound and drive the screw 14 to rotate The lock enters the positioning function of the lock compound.

However, it has been found that, after the use of the self-locking screw 1 , the positioning end 134 forms a point contact with the surface of the lock compound, and the surface of the lock compound is smooth. When the surface is used, the friction generated by the surface will be smaller. Therefore, when the self-rotating torque of the self-drilling screw 1 is rapidly driven, the self-drilling screw 1 may cause slippage on the lock compound to cause a deviation phenomenon. The positioning end 132 can not only effectively lie on the lock compound, but also makes the lock positioning inaccurate and difficult, and causes inconvenience in the lock cooperation industry, and at the same time causes damage to the lock during the lock process. The surface of the compound is destroyed, and the appearance of the lock compound is broken. Further, after the drilling screw 1 is positioned with difficulty in locking, the drill body 131 is only engaged by the two drill edges 136. When the rotation is locked into the lock compound, not only is it laborious, but also the passivation of the drill blades 136 during the locking process is caused, which affects the subsequent locking speed, which needs to be improved.

Therefore, the object of the present invention is to provide a self-drilling screw which has the function of strengthening the positioning function of the tail portion of the drill and preventing the slippage from being displaced, and the sharpness of the drill lock is increased to achieve the quick lock positioning and the like.

Therefore, the drill screw of the present invention comprises a screw head, a rod body disposed on the screw head and extending outwardly, a drill tail portion opposite to the screw head and disposed at the other end of the rod body, and a plurality of spiral rings are disposed on a thread on the shaft; wherein the tail portion has a drill body extending outward from the rod body, and the drill body extends outwardly and has an inclined drill tail, at least one of which is opened in the drill body and drill On the tail of the chip flute, And a positioning end located at the end edge of the drill hole, and at least one positioning groove is formed in the drill tail, and a positioning edge is formed at the intersection of the positioning groove and the drilling tail, and the positioning groove is connected to the chip flute The use of the positioning groove is such that when the drill tail is in contact with the surface of the lock compound, multiple fixed points of contact can be achieved to strengthen the stable positioning function of the drill tail on the lock compound, and During the locking process, the drill edge is matched with the two drill edges of the drill tail to assist in drilling and cutting the lock compound, which not only can improve the sharp effect and the drilling speed of the drill edge, but also prevent the deflection during the drilling lock process. Move to reduce the force and time when locking, and greatly improve the sharpness of the drill lock cutting, in order to achieve the effect of fast drilling lock position.

[study]

1‧‧‧Drilling screws

11‧‧‧ screw head

12‧‧‧ rod body

13‧‧‧Drill tail

14‧‧‧ thread

131‧‧‧Drill

132‧‧‧Drilling tail

133‧‧‧chip flute

134‧‧‧ Positioning end

135‧‧‧ cutting edge

136‧‧‧Drill

〔this invention〕

3‧‧‧Drilling screws

31‧‧‧ screw head

32‧‧‧ rod body

33‧‧‧Drill tail

34‧‧‧ thread

331‧‧‧ drill body

332‧‧‧Drilling tail

333‧‧‧chip flute

334‧‧‧ Positioning end

335‧‧‧ Chip Blade

336‧‧‧Drill

337‧‧‧ positioning slot

338‧‧‧Drilling edge

339‧‧‧ side blade

4‧‧‧Lock compound

Figure 1 is a schematic view of a conventional drill tail screw.

Figure 2 is a schematic illustration of a first preferred embodiment of the present invention.

Figure 3 is an enlarged schematic view of a portion of the preferred embodiment of the preferred embodiment.

Figure 4 is a schematic view of the lock of the preferred embodiment.

Figure 5 is a schematic illustration of a second preferred embodiment of the present invention.

The above and other technical contents, features, and advantages of the present invention will become apparent from the Detailed Description of the <RTIgt;

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 2, in a first preferred embodiment of the present invention, the self-drilling screw 3 includes a screw head 31, a rod body 32 disposed on the screw head 31 and extending outwardly, and a screw head 31 opposite to the screw head 31. a drill tail portion 33 at the other end of the rod body 32, and a thread 34 of a plurality of spiral rings disposed on the rod body 32; wherein the drill tail portion 33 has a drill body 331 extending outward from the rod body 31, a drill tail 332 extending outward from the drill body 331 and having an inclined shape, at least one chip opening 333 formed on the drill body 331, the drill tail 332, and a positioning end 334 at the end edge of the drill tail 332. The cutting edge 333 is formed with a cutting edge 335 at the intersection of the chip flute 333, and the two cutting edges 336 are formed at the junction of the chip flute 333 and the drill tail 332, and the drilling edges are 336. The positioning end 334 is disposed on the two sides of the positioning end 334. In addition, please refer to FIG. 3, at least one positioning slot 337 is defined in the drilling tail 332, and a positioning edge 338 is formed at the intersection of the positioning slot 337 and the drilling tail 332. The positioning groove 337 is in communication with the chip flute 333. Of course, the drill edge 338 of the positioning groove 337 is disposed in parallel with the drill edge 336. Whom shown.

Referring to FIG. 3 and FIG. 4 , when the locking is performed, the design of the positioning groove 337 is firstly formed on the drilling tail 332 to cooperate with the positioning end 334 to generate a multi-point support contact on the surface of the locking compound 4 to stabilize the contact. On the surface of the lock compound 4, the puncture screw 3 can not only improve the frictional force of the drill tail 332 in contact with the surface of the lock compound 4 under the rotational torque application, so that the drill tail 332 When the screw 31 is driven, the slippage and the positioning offset may be reduced when the locking is lowered, and when the drilling edge 336 of the drilling tail 332 is drilled and cut at the lock compound 4, The auxiliary side of the positioning groove 337 is assisted by the drill edge 338, so that the drill tail 332 Forming a multi-point contact with the lock compound 4 when the lock is inserted, so that the drill edges 336 are protected from passivation during the drilling and locking process, and the appearance of the lock compound 4 is not damaged, so that the The drill tail 32 is positioned at the lock, in particular, the lock compound 4 is more characteristic when it is a metal product, and then the twist lock torque can be continuously applied to enable the drill edge 336 to be positioned. A drilling hole is cut in the lock compound 4 to cut a hole, and the cutting edge 335 is continuously drilled, so that the self-drilling screw 3 can be quickly locked in the lock compound 4, At the same time, the force and time of the lock are greatly reduced, and the sharpness of the drill lock cutting is improved, so as to achieve the effect of fast drilling lock position.

Referring to FIG. 5, in the second preferred embodiment of the present invention, the self-drilling screw 3 further includes main components such as a screw head 31, a rod body 32, a drill tail portion 33, and a plurality of thread teeth 34, and the present embodiment and the previous embodiment The difference is that the one side edge 339 is formed between the positioning groove 337 and the chip flute 333, so that the positioning groove 337 is not in communication with the chip flute 333, and the positioning groove 337 has a drill edge 338 and the side. When the 339 is overlapped, the side edge 339 not only increases the positioning and positioning effect of the positioning end 334, but also assists the drilling 336 to effectively cut the lock compound 4, and has Helping to increase the strength of the drill edges 336, and greatly reducing the wear and tear generated during the locking process of the drill tail portion 33.

From the above, it can be clearly seen that the drill screw of the present invention does have an effect improvement in use, and is summarized as follows:

1. The present invention provides at least one positioning groove 337 on the drill tail 332 to improve the friction of the drill tail 332 in contact with the surface of the lock compound 4. The force can not only prevent the positioning end 334 from being greatly slipped during the drilling and locking process, but also can be quickly locked and positioned at the fixed position, and can also avoid damage to the appearance of the lock compound 4.

2. The above is continued, and a side blade 339 is formed between the positioning groove 337 and the chip flute 333, but the positioning and positioning effect of the positioning end 334 is increased, and the drilling edges 336 are assisted to effectively drill. The lock compound 4 is cut, and at the same time, the strength of the drill edge 336 is improved, and the wear phenomenon generated during the locking process of the drill tail portion 33 is greatly reduced, so as to reduce the force and time during the locking, and greatly improve the drill lock. The sharpness of the cutting, in order to achieve the effect of fast drilling lock position.

In summary, the design of the drill screw of the present invention is provided by at least one positioning groove on the tail portion of the drill, which not only enables the drill screw to be supported at multiple points when it contacts the lock compound, but is stably fixed on the lock compound to strengthen In addition to the positioning function of the drill tail, the drill edge of the drill tail is matched with the two drill edges of the drill tail to assist the drilling and cutting, which not only reduces the force application and time, but also enhances the sharp effect and the drilling speed of the drill edge. , greatly improving the effect of quick lock positioning, etc., so it can achieve the purpose of the present invention.

The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made in accordance with the scope of the present invention and the contents of the description of the invention. All should remain within the scope of the invention patent.

3‧‧‧Drilling screws

31‧‧‧ screw head

32‧‧‧ rod body

33‧‧‧Drill tail

34‧‧‧ thread

331‧‧‧ drill body

332‧‧‧Drilling tail

333‧‧‧chip flute

334‧‧‧ Positioning end

335‧‧‧ Chip Blade

336‧‧‧Drill

337‧‧‧ positioning slot

338‧‧‧Drilling edge

Claims (5)

A self-drilling screw comprising a screw head, a rod body disposed on the screw head and extending outwardly, a drill tail portion opposite to the screw head and disposed at the other end of the rod body, and a plurality of spiral rings disposed on the shaft a thread on the shaft; wherein the tail portion has a drill body extending outward from the rod body, and a drill tail extending outward from the drill body and having an inclined shape, at least one of which is opened in the drill body and drilled a chip flute on the tail, and a positioning end located at the trailing edge of the drill, and the chip flute is formed with a cutting edge at the junction of the drill body, and the chip flute is formed at the junction with the drill tail There are two drilled edges, and the drilled edges are respectively disposed on the two sides of the positioning end; the at least one positioning groove is formed on the drill tail, and the positioning groove and the drill tail are formed with a drill edge, and the same The positioning groove is in communication with the chip flute. According to the drill tail screw of the first aspect of the patent application, a side edge is formed between the positioning groove and the chip flute, so that the positioning groove and the chip flute are not in communication with each other. The self-drilling screw of the first or second aspect of the patent application, wherein the drilling edge of the positioning groove is disposed in parallel with the drilling edge. A self-drilling screw according to the second aspect of the patent application, wherein a drill edge of the positioning groove overlaps the side edge. A self-drilling screw according to the third aspect of the patent application, wherein a drill edge of the positioning groove overlaps the side edge.