TWM540937U - Self-drilling screw - Google Patents

Description

Self-drilling screw

This creation is about a screw design, especially with regard to a type of self-drilling screw.

Referring to FIG. 1 and FIG. 2, the conventional self-drilling screw 1 includes a screw head 11, a rod body 12 extending from the screw head 11 and extending outwardly, and a plurality of screw rings 13 disposed on the rod body 12, And a drill lock unit 14 opposite to the screw head 11 and disposed on the rod body 12; wherein the drill lock unit 14 has a drill body 141 that is in contact with the rod body 12, and is formed on the drill body 141. The end surface 142 of the end portion is formed on the drill body 141 and the end surface 142 is divided into two pairs of guiding grooves 143, and two cutting edges are formed at the joint of the drilling body 141 and the guiding grooves 143. 144, and a positioning end 145 formed at the intersection of the two cutting edges 144, and each of the guiding grooves 143 and the drilling body 141 are respectively formed with a stopping surface 146, a plane 147 and a cutting edge 148. When the lock cooperation is performed, the positioning end 145 is placed on the object 2, and a rotational force is applied to drill the cutting edge 144 disposed on two sides of the positioning end 145 for guiding. The drill body 141 is screwed into the object 2, and the chips generated during the drilling process are used to receive the chips and are arranged outwardly by the guide grooves 143 which are connected to the two drill edges 144. This is done to complete the locking positioning of the self-drilling screw 1.

However, it has been found that, since the guide groove 143 is directly opened on the drill body 141, the end surface 142 is disposed in a non-connecting manner with the guide groove 143, so that the chips generated by the drilling and cutting are subjected to the The abutting pressure of the end surface 142 is blocked by the stopping surface 146, and cannot smoothly enter the guiding groove 143, which inevitably increases the drilling resistance of the two drilling edges 144, thereby causing the cutting speed to decrease, resulting in a decrease in cutting speed. The user must apply a greater rotational force to allow the cutting edge 148 to be drilled in the object 2, which will cause the cutting edges 144 to wear and affect the initial lock cooperation.

Moreover, in order to effectively strengthen the drill lock strength of the drill lock unit 14, the heat treatment process is generally performed during the molding process of the drill lock unit 14, but the machining method may cause the drill lock unit 14 to be excessively hardened. The drilling edge 144 can not effectively resist the locking stress due to the hardening factor, so the damage and fracture phenomenon occurs at the initial stage of the drilling, which affects the subsequent drilling and cutting ability of the drilling screw 1 and reduces the combined speed. Improve.

Therefore, the purpose of the present invention is to provide a drill-tail screw, which can improve the smoothness of the guide chip and improve the storage effect of the chip, so that the use can achieve the effects of quick locking and lowering the locking torque.

Therefore, the drill shaft of the present invention comprises a screw head, a rod body, a plurality of thread teeth and a drill lock unit; wherein the drill lock unit has a drill body connected to the rod body, and a drill body is formed on the drill body The end surface of the end portion is formed on the drill body and the end surface is divided into two pairs of side guide grooves, respectively forming two drill edges at the end faces of the guide grooves, and the two drill edges Forming a positioning end, and each of the guiding grooves has a stopping surface, a plane contacting the stopping surface, and a surface formed at the plane contacting the drilling body and connected to the drilling edge a cutting edge, and a concave curved surface is formed on the stopping surface, and the concave curved surface extends from the end surface toward the plane direction, and also extends downward to connect to the positioning end; The arrangement of the concave curved surface formed on the stop surface can make a large amount of chips generated during drilling and cutting unimpeded through the end surface and the concave curved surface to quickly enter the guiding groove and then discharge outward. In order to prevent the drill blades from being obstructed by excessive accumulation of chips, the torque of the drill lock is increased. , So as to achieve rapid closure positioning effect.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments of the invention.

Referring to FIG. 3 and FIG. 4, the self-drilling screw 3 of the first preferred embodiment of the present invention includes a screw head 31, a rod body 32 disposed on the screw head 31 and extending outwardly, and a plurality of spiral rings are disposed thereon. a thread 33 on the rod body 32, and a drill lock unit 34 opposite to the screw head 31 and disposed at the other end of the rod body 32; wherein the drill lock unit 34 has a drill body connected to the rod body 32 341, an end surface 342 formed at an end of the drill body 341 is formed on the drill body 341, and the end surface 342 is divided into two pairs of side guide grooves 343 formed on the end surfaces 342 and the guide The two drill edges 344 at the junction of the ditch 343 and the two drill edges 344 are connected to each other to form a positioning end 345. Each of the guiding grooves 343 has a stopping surface 346, and the stopping surface 346 is connected thereto. A plane 347, and a cutting edge 348 formed on the plane 347 at the intersection of the drill body 341, and the positioning end 345 is formed in an outwardly convex shape and formed with an angle α.

Continuing the foregoing, the stop surface 346 is formed with a concave curved surface 349, and the concave curved surface 349 extends from the end surface 342 to the plane 347, as shown in FIG. 4, so that the concave curved surface 349 is Extending from the end of the end surface 342 and the stop surface 346 to the junction of the stop surface 346 and the plane 347, while the concave curved surface 349 extends downward to connect to the positioning end 345, Therefore, the smoothness of the guide chips can be increased and the overall space of each of the guide grooves 343 can be enlarged.

Referring to FIG. 3 to FIG. 5, when the lock cooperation is performed, the positioning end 345 can be firstly engaged with the lock member 4. Since the positioning end 345 is convexly pointed, the top member is attached to the lock member 4. A stable fixed position is generated and no offset slip phenomenon is formed, and then a rotational torque is applied to the screw head 31 by a locking tool (not shown) to interlock the two drill edges 344 to rotate. Drilling and cutting, to gradually drill into the lock member 4, and the cutting edge 348 of the drill body 341 is drilled and cut, thereby generating a plurality of chips, at this time, the end face 342 and the guide groove 343 With the formation of the concave curved surface 349, the chips generated by the cutting edges 344 will enter the concave curved surface 349 first, so that the chips will not be crushed by the end surface 342, It is not blocked by the stop surface 346, and the chips formed by the cutting edge 348 are also effectively and quickly guided into the guide groove 343, so that the cutting edge 344 and the cutting edge The chips cut by 348 can be discharged outward from the guide groove 343, thereby enabling the cutting edges 344 and the cut The cutting resistance of the cutting edge 348 is greatly reduced. Further, in view of the extension of the concave curved surface 349 formed on the stop surface 346 between the end surface 342, the plane 347 and the positioning end 345, the The end surface 342 is in communication with the plane 347 due to the arrangement of the concave curved surface 349, which not only increases the smoothness of the guide chip, but also enlarges the overall chip space of the guide groove 343, thereby having sufficient space for the portion. The chip is left in the mold. Further, the drilling lock unit 34 can utilize the design of the concave curved surface 349 to improve the storage of the chip during the initial drilling, thereby achieving a better and faster cutting effect, thereby effectively reducing the cutting effect. Locking torque and lifting lock efficiency.

Referring to FIG. 6, the second preferred embodiment of the present type of self-drilling screw 3 still includes the components described in the previous embodiment, and the connection between the element and the element is the same as that described in the previous embodiment, and will not be described again. In particular, in the embodiment, each end surface 342 of the drill lock unit is formed by the first and second inclined sections 3421, 3422, and the first inclined section 3421 is connected to the drill body. 341 is connected, and the second inclined section 3422 extends from the first inclined section 3421 to the positioning end 345, and the first inclined section 3421 of the end faces 342 is formed to meet an angle α1 which is larger than the end faces 342. The second inclined section 3422 intersects to form an angle α2, so that the end surface 342 is combined with the positioning end 345 to form a tip-shaped design having a two-stage and more outward convex shape. Further, in this embodiment, Each of the cutting edges 348 can be inclined toward the rod body 32 by the drilling edges 344, and the outer diameter r2 formed by the outwardly extending edges of the drilling edges 344 is greater than the outer diameter r1 of the rod body 32, that is, the same The junction of the cutting edge and the cutting edges 348 is formed to have a maximum outer diameter r2, which is greater than the maximum outer diameter r2 The outer diameter r1 of the body; when locking, the special pointed design formed by the positioning end 345 can be utilized to achieve the initial non-offset positioning function, when the two drilling edges 344 enter the lock member 4, That is, the characteristic that the maximum outer diameter r2 is greater than the outer diameter r1 is utilized, so that the two drill edges 344 are placed on the lock member 4, so that the two drill edges 344 and the positioning end have a three-point support positioning effect. When the positioning end 345 and the two drilling edges 344 are drilled and cut, the drilling lock stress is effectively resisted and no breakage occurs, and the drill body 341 is further driven to perform rapid drilling and cutting, and at the same time The recessed arc surface 349 is disposed to allow the chip to be discharged into the guide groove 343 without any hindrance, thereby increasing the locking speed and the fastening force of the self-drilling screw 3.

In summary, the new type of self-drilling screw has a recessed curved surface formed on the stop surface of the drill lock unit to enlarge the guide vane space, so as to prevent the lock speed from being affected by the blockage of the stop surface. Therefore, not only can the smoothness of the guide vanes be effectively increased, but also the design of the concave curved surface can greatly improve the effect of the storage of the chips, so as to prevent the drill edges from being obstructed by accumulating excessive chips and reducing the locking torque, thereby achieving Quickly lock and other effects, it can indeed achieve the purpose of this new type.

However, the above description is only for the purpose of illustrating the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made in accordance with the scope of the present patent application and the contents of the new specification. All should remain within the scope of this new patent.

(known)
1‧‧‧Drilling screws
11‧‧‧ screw head
12‧‧‧ rod body
13‧‧‧ thread
14‧‧‧Drill lock unit
141‧‧‧ drill body
142‧‧‧ end face
143‧‧‧Guiding ditch
144‧‧‧Drill
145‧‧‧ Positioning end
146‧‧‧ stop surface
147‧‧‧ plane
148‧‧‧cutting surface
2‧‧‧ objects
(this creation)
3‧‧‧Drilling screws
31‧‧‧ screw head
32‧‧‧ rod body
33‧‧‧ threaded teeth
34‧‧‧Drill lock unit
341‧‧‧ drill body
342‧‧‧ end face
343‧‧‧Guiding ditch
344‧‧‧Drill
345‧‧‧ Positioning end
346‧‧‧ stop surface
347‧‧‧ plane
348‧‧‧ cutting edge
349‧‧‧ concave curved surface
3421‧‧‧First inclined section
3422‧‧‧Second inclined section α‧‧‧Angle angle α1‧‧‧An angle between the first inclined section α2‧‧‧An angle of the second inclined section
R1‧‧‧ rod outer diameter
The largest outer diameter of the r2‧‧‧ cutting edge
4‧‧‧Lock fittings

Figure 1 is a schematic view of a conventional drill tail screw. Figure 2 is a schematic view of the conventional lock state. Figure 3 is a schematic view of a first preferred embodiment of the present invention. Figure 4 is an enlarged schematic view of a portion of the preferred embodiment. Figure 5 is a schematic view of the locked state of the preferred embodiment. Figure 6 is an enlarged schematic view of a partial member of a second preferred embodiment of the present invention.

3‧‧‧Drilling screws

31‧‧‧ screw head

32‧‧‧ rod body

33‧‧‧ threaded teeth

34‧‧‧Drill lock unit

341‧‧‧ drill body

342‧‧‧ end face

343‧‧‧Guiding ditch

344‧‧‧Drill

345‧‧‧ Positioning end

346‧‧‧ stop surface

347‧‧‧ plane

348‧‧‧ cutting edge

349‧‧‧ concave curved surface

Claims (3)

A self-drilling screw comprising a screw head, a rod body extending outward from the screw head, a plurality of spiral rings disposed on the rod body, and a screw opposite the screw head and disposed on the rod body a drill lock unit; wherein the drill lock unit has a drill body connected to the rod body, an end surface formed at an end portion of the drill body, two opening on the drill body and dividing the end surface into two opposite sides a guiding groove, respectively formed at two end faces of the end faces that meet the guiding grooves, and a positioning end formed at the intersection of the two cutting edges, and each of the guiding grooves has a stop a surface, a plane that is in contact with the stop surface, and a cutting edge formed on the plane and connected to the drill body and connected to the drill edge; wherein: a recess is formed on each stop surface The curved surface, and the concave curved surface extends from the end surface toward the plane, and also extends downward to be connected to the positioning end, thereby increasing the smoothness of the guide chip and expanding the space of the guide groove. The self-drilling screw according to claim 1, wherein each of the end faces is formed by the first and second inclined sections, and the first inclined section is connected to the drill body, the first The two inclined sections extend from the first inclined section to the positioning end, and the angle formed by the intersection of the first inclined ends of the two end faces is greater than the angle formed by the intersection of the second inclined sections of the two end faces. The self-drilling screw according to claim 1 or 2, wherein each of the cutting edges is inclined from the cutting edge toward the rod body, and the cutting edges are extended to the largest The outer diameter is larger than the outer diameter of the rod.