TWI571569B - Screw - Google Patents

Description

Screw

The invention relates to a coupling element, in particular to a screw.

The general screw is mainly used as a screw tapping portion by a screw thread, and then driven by a screw driver or other tools to fix the screw drill to the lock compound. However, the aforementioned screw does not have a tail groove because of its screw tapping portion. Therefore, when the screw is fully screwed into the lock compound by the screw tapping portion, it must be tightened by the screw tooth structure and the external force is forced. When screwed in, the structure of the lock compound can be destroyed and the resistance can be overcome, and the chips can not be discharged in time, which may cause the lock compound to crack.

In order to improve the above problem, a manufacturer has developed a screw 1 having a tail-cut groove 11 as shown in FIG. 1, which provides an auxiliary function of the chip-discharging material, so as to reduce the screw 1 to break into the lock compound 10. Difficulty, and avoiding the cracking of the lock compound 10 due to chip removal problems. However, there is a screw 1 having a tail groove 11 which extends to the end of the screw 1. Since the rod diameter of the end is tapered, the formation of the tail groove 11 will cause a screw. The strength of 1 is lowered, and the problem of breakage of the screw 1 is liable to occur during the locking process.

Accordingly, it is an object of the present invention to provide a screw that avoids reducing structural strength.

Thus, the screw of the present invention comprises a threaded section having a bottom surface, a threaded section connecting the bottom surface of the threaded section, and at least one chip forming portion formed on the threaded section. The thread segment includes a shaft portion extending from a bottom surface of the screw head portion away from the screw head portion and having the same outer diameter of the tooth, and a portion extending from the shaft portion away from the screw head portion and gradually Convergence forms the end of the rod at one end. The chip evacuation portion is formed on the shaft portion of the threaded portion and does not extend to the tail portion of the rod. The chip removing portion has a V-shaped cross section and has a first bottom groove surface and a second bottom groove surface connected to the first bottom groove surface, and the joints of the first and second bottom groove surfaces are defined a boundary line defining a first maximum distance perpendicular to the boundary line on the first bottom groove surface, and a second maximum distance perpendicular to the boundary line on the second bottom groove surface, the first maximum distance and the second The maximum distance is not equal.

The utility model has the advantages that: the chip removing portion is formed on the shaft portion of the thread segment and does not extend to the tail portion of the thread portion, thereby avoiding damage to the structural strength of the tail portion and avoiding the screwing process. The case where the tail of the rod is broken, and the structural design of the chip removing portion can provide a better chip removing effect.

2‧‧‧ screws

21‧‧‧ screw head segment

211‧‧‧ bottom

22‧‧‧ thread segments

221‧‧‧ shaft body

222‧‧‧ rod tail

23‧‧‧The chip removal department

231‧‧‧ first bottom groove surface

232‧‧‧Second bottom groove surface

L‧‧‧ crossing line

D‧‧‧ teeth outer diameter

H1‧‧‧first maximum distance

H2‧‧‧ second maximum distance

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: FIG. 1 is a side view showing a conventional screw having a cutting groove; FIG. 2 is a side view illustrating the present invention. Embodiment of the screw; FIG. 3 is a cross-sectional view showing the structure of a chip flute in the embodiment; Figure 4 is a schematic view of the structure of the chip flute.

Referring to FIG. 1 and FIG. 2, the embodiment of the screw 2 of the present invention comprises a screw segment 21 having a bottom surface 211, a thread segment 22 connecting the bottom surface 211 of the screw segment 21, and a threaded segment formed thereon. The chip removal portion 23 on the 22nd. The thread segment 22 includes a shaft portion 221 extending from the bottom surface 211 of the screw head away from the screw head segment 21 and having the same outer diameter D of the tooth, and a shaft portion 221 away from the screw head portion The direction of 21 extends and gradually converges to form an end of the rod tail 222. The chip removing portion 23 is formed in a recess formed on the shaft portion 221 of the threaded portion 22 and does not extend to the tail portion 222.

Referring to FIGS. 2 to 4, the chip removing portion 23 has a V-shaped cross section and has a first bottom groove surface 231 and a second bottom groove surface 232 connecting the first bottom groove surface 231. The junction of the second bottom groove surfaces 231, 232 defines a boundary line L defining a first maximum distance H1 perpendicular to the boundary line L on the first bottom groove surface 231, and a vertical on the second bottom groove surface 232. The boundary line L has a second maximum distance H2, that is, the first maximum distance H1 refers to the maximum vertical distance of the boundary line L along the first bottom groove surface 231 to the end of the thread, and the second maximum The distance H2 refers to the maximum vertical distance of the boundary line L along the second bottom groove surface 232 to the end of the thread, and the first maximum distance H1 is not equal to the second maximum distance H2. In the embodiment, the first maximum distance H1 of the chip removing portion 23 is 1/3 of the outer diameter D of the shaft portion 221, and the second maximum distance H2 is outside the tooth portion 221 1/2 of the diameter D. Applicant should note that if the depth of the chip removing portion 23 is greater than 1/2 of the outer diameter D of the tooth, although the chip removing force is good, it will be in the process of locking. Since the torsion is too large and it is easy to break, and if the depth of the chip discharge portion 23 is less than 1/3 of the outer diameter D of the tooth, the problem of insufficient chip discharge force is caused. Therefore, the design of the present invention is such that the first maximum distance H1 is 1/3 of the outer diameter D of the tooth portion 221 of the shaft portion 221, and the second maximum distance H2 is matched with the outer diameter D of the tooth portion 221 of the shaft portion 221 The structural setting of /2 can strike a balance between chip evacuation force and structural strength.

Since the screw 2 of the general drill tail shape is tapered to form a sharp point, the present invention forms the chip removing portion 23 on the shaft portion 221 of the threaded portion 22 and does not extend to the same. The tail portion 222 can avoid damage to the structure of the tail portion 222 and can reduce the breakage of the screw 2 during the drilling lock. Further, the chip removing portion 23 is designed to have a structure as described above, and a better chip removing effect can be produced. It should be noted that, in this embodiment, one chip removing portion 23 is taken as an example, but in actual practice, two chip removing portions 23 may be provided.

In summary, the screw 2 of the present invention is formed on the shaft portion 221 of the threaded portion 22 by the chip removing portion 23 and does not extend to the tail portion 222, thereby avoiding the tail portion during the screwing process. When the 222 is broken, and the structural design of the chip removing portion 23 can provide a better chip removing effect, the object of the present invention can be achieved.

However, the above is only the 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 by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

221‧‧‧ shaft body

23‧‧‧The chip removal department

231‧‧‧ first bottom groove surface

232‧‧‧Second bottom groove surface

L‧‧‧ crossing line

D‧‧‧ teeth outer diameter

H1‧‧‧first maximum distance

H2‧‧‧ second maximum distance

Claims (1)

A screw comprising: a screw head segment having a bottom surface; a thread segment comprising a shaft portion extending from a bottom surface of the screw head portion away from the screw head portion and having the same outer diameter of the tooth, and The shaft portion extends away from the screw head section and gradually converges to form an end portion of the rod tail portion; and at least one chip portion formed on the shaft portion of the thread portion and not extending to the tail portion of the rod portion Wherein the chip removing portion has a V-shaped cross section and has a first bottom groove surface and a second bottom groove surface connected to the first bottom groove surface, and the first and second bottom groove surfaces are connected Defining a boundary line defining a first maximum distance perpendicular to the boundary line on the first bottom groove surface, and a second maximum distance perpendicular to the boundary line on the second bottom groove surface, the first maximum distance and the The second maximum distance is not equal, and the first maximum distance is 1/3 of the outer diameter of the tooth of the shaft portion, and the second maximum distance is 1/2 of the outer diameter of the tooth portion of the shaft portion.