TWM491097U - Self-tapping screw - Google Patents

Description

Self-tapping screws

The present invention relates to a screw, and more particularly to a self-tapping screw.

Referring to Fig. 1, a conventional self-tapping screw 1 is constructed to include a screw head 11, a screw 12, a drill bit 13, and a thread 14 formed on the outer surface of the screw 12. The screw head 11 is formed at the bottom of the screw head 11 and is tapered to form a constricted portion 111 and is connected to one end of the screw 12. The drill bit 13 is formed at the other end of the screw 12. When the self-tapping screw 1 is used for locking a piece of wood 2, a driving tool (not shown) is sleeved on the screw head 11 of the self-tapping screw 1 to drive the self-tapping screw 1 to the spiral of the wood 2 Advance to achieve the role of the lock wood 2.

Since the wood chips 21 generated during the auger drilling are pushed in the direction of the screw head 11 with the rotation of the thread 14, the wood chips 21 are sheet-like long fibers, so that the chips are easily accumulated at the drill hole 22, as The gradual sinking of the screw head 11 into the wood 2 exerts a pressing force on the wood chips 21 located at the drill hole 22, further causing the constricted portion 111 of the screw head 11 not to be completely buried in the wood 2, and the screw head 11 is also It is impossible to completely bury the wood in the wood 2 and is convex. At this time, if the spiral is continued, the wood chips 21 accumulated at the drill hole 22 will exert a strong reaction force on the drill hole 22, which will eventually cause the Wood 2 Cracks are generated, such exposed wood chips 21, raised screw heads 11, and cracks all affect the appearance of the wood 2, and the personnel are slightly more susceptible to being exposed by the screw head 11 and the protrusion of the self-tapping screw 1 Sawdust 21 is scratched and the use is not safe.

Therefore, the object of the present invention is to provide a self-tapping screw which can ensure that the waste generated in the auger process is compacted and stored without being exposed, thereby improving the safety of use.

Thus, the novel self-tapping screw comprises a screw head, a rod body, a drill bit, and a threaded unit. The screw head has a head portion, a constricted portion extending from the lower portion of the head portion, a pressing edge extending from the bottom edge of the head portion to the constricted portion, and a plurality of protruding protrusions on the bottom surface of the head portion. The cutting edge, each cutting edge is located between two adjacent pressing edges. One end of the rod is connected to the constricted neck of the screw head. The drill bit is formed at the other end of the rod. The threaded unit is spirally formed on the outer surface of the rod.

The utility model has the advantages that the cutting edges and the pressing blades are arranged to enable the self-tapping screws to be firstly cut by the pressing blades during the process of augmenting an object. Then, the cutting wastes are used to cut the shortened waste materials again, and the head of the screw head is gradually dipped in the object to compact the scraped waste material into the self-tapping. The outer circumference of the neck of the screw, the head of the screw head can be reliably buried in the object, so that the outer surface of the object can be kept flat and beautiful, the safety of use can be improved, and the stability of the self-tapping screw can be improved. Sex.

3‧‧‧ Self-tapping screws

31‧‧‧ screw head

311‧‧‧ head

312‧‧ ‧ neck

313‧‧‧ pressed blade

314‧‧‧ cutting edge

32‧‧‧ rod body

33‧‧‧ drill bit

34‧‧‧Threaded unit

341‧‧‧First thread segment

342‧‧‧Second thread segment

4‧‧‧ objects

41‧‧‧Sawdust

Other features and effects of the present invention will be clearly shown in the embodiments with reference to the drawings, wherein: FIG. 1 is a schematic view showing a prior art self-tapping screw use pattern; FIG. 2 is a schematic view showing the present invention One embodiment of a self-tapping screw; FIG. 3 is a bottom view illustrating a bottom view of the embodiment; FIG. 4 is a partial schematic view showing one aspect of a plurality of cutting edges of the embodiment; FIG. The schematic view illustrates another aspect of the cutting edges of the embodiment; FIG. 6 is a partial schematic view showing still another aspect of the cutting edges of the embodiment; and FIG. 7 is a schematic view showing the implementation. The use of the example.

Referring to Figures 2 and 3, an embodiment of the self-tapping screw 3 of the present invention includes a screw head 31, a rod body 32, a drill bit 33, and a threaded unit 34. The screw head 31 has a head portion 311, a constricted portion 312 extending downwardly from the head portion 311, a pressing edge 313 extending from the bottom edge of the head portion 311 to the constricted portion 312, and a plurality of convex portions. A cutting edge 314 is provided on the bottom surface of the head 311. Each cutting edge 314 is located between two adjacent pressing edges 313. The angle between the cutting edge 314 and the bottom surface of the head 311 of the screw head 31 is 90 degrees or less, that is, as shown in FIGS. 4, 5, and 6.

Referring to FIG. 2, one end of the rod body 32 is connected to the constricted portion 312 of the screw head 31. The drill bit 33 is formed at the other end of the rod body 32. In addition, The thread unit 34 is spirally formed on the outer surface of the rod body 32. The threaded unit 34 has a first threaded section 341 and a second threaded section 342, but not limited thereto. The threaded unit 34 can also be a single threaded section.

Referring to Figures 3 and 7, in use, the self-tapping screw 3 can be used to drill an object 4, which in the present embodiment is illustrated by wood. When the self-tapping screw 3 is auger, the drill bit 33 firstly touches the surface of the object 4, and then is coupled to the head 311 of the tapping screw 3 by a driving tool (not shown), and then the self-tapping screw is driven. 3, the spiral unit 34 is screwed into the object 4, and when the pressing blade 313 on the constricted portion 312 of the self-tapping screw 3 contacts the object 4, the wood chips 41 generated during the auger cutting are cut, so that The length of the wood chips 41 is shortened, and then the saw blade 41 is cut again by the cutting edges 314, and the head 311 of the screw head 31 is gradually sunk in the object 4 to The sawdust 41 in a broken state is compacted on the outer circumference of the constricted portion 312 of the self-tapping screw 3 and completely embedded in the object 4, and the head 311 of the screw head 31 can be surely buried in the object 4, so that not only The object 4 does not generate cracks, and the outer surface of the object 4 can be kept flat and beautiful, and the safety of use can be improved. In addition, the stability of the self-tapping screw 3 can be increased by compacting the wood chips 41 on the outer circumference of the constricted portion 312 of the self-tapping screw 3.

In summary, the self-tapping screw 3 of the present invention can make the scrap generated by the self-tapping screw 3 during the process of screwing the object 4 by the above-mentioned structural design, and can be firstly passed through the constricted neck 312. Sub-cutting, re-cutting the shortened scrap with the pressing edges 314, and allowing the cutting waste that has been crushed to be compacted to the constricted portion of the self-tapping screw 3 312 the outer circumference, the head 311 of the screw head 31 can also be reliably buried in the object 4, not only the object 4 does not generate cracks, and the outer surface of the object 4 can be kept flat and beautiful, and the personnel will not be protruded. The screw head 31 is scratched, thereby improving the safety of use. Further, the outer circumference of the constricted portion 312 of the self-tapping screw 3 is compacted by the cutting waste which has been crushed, and the stability of the self-tapping screw 3 can be improved. Therefore, the purpose of this new type can be achieved.

However, the above description is only for the embodiments of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent changes and modifications made by the present patent application scope and the contents of the patent specification are still It is within the scope of this new patent.

3‧‧‧ Self-tapping screws

31‧‧‧ screw head

311‧‧‧ head

312‧‧ ‧ neck

313‧‧‧ pressed blade

314‧‧‧ cutting edge

32‧‧‧ rod body

33‧‧‧ drill bit

34‧‧‧Threaded unit

341‧‧‧First thread segment

342‧‧‧Second thread segment

Claims (3)

A self-tapping screw comprising: a screw head having a head, a constricted neck extending below the head, a pressing edge extending from the bottom edge of the head to the constricted portion, and a majority a cutting edge protruding from a bottom surface of the head, each cutting edge being located between two adjacent pressing blades; a rod body having one end connected to the constricted portion of the screw head; and a drill bit formed at the other end of the rod body; A threaded unit, the spiral is formed on the outer surface of the rod. The self-tapping screw according to claim 1, wherein an angle between the cutting edge and a bottom surface of the head of the screw is 90 degrees or less. The self-tapping screw of claim 1 or 2, wherein the threaded unit has a first threaded section and a second threaded section.