Screw nail

Abstract

To provide a screw capable of reducing the torque by optimizing the performance of discharging chips of wood when screwed in.SOLUTION: A screw has a head 2 and a screw body 3, which comprises a shank 31 extending along a prescribed axis Z from the head and a drill bit 32 at a tip of the shank 31. The screw body 3 is provided with a screw thread 4 projecting helically, and multiple chip discharge grooves 5. Each chip discharge groove 5 is inclined at an angle in the range from 5 degrees to 35 degrees relative to the axis Z. At least two chip discharge grooves 5 of the multiple chip discharge grooves 5 are parallel with each other.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to fastening components, in particular to screws. [Background technology]

[0002] Conventional screw nails are described in, for example, Patent Document 1. Figure 1 shows an example of the conventional screw nail. As shown in the figure, the screw nail 1 has a head 11, a nail body 12 extending downward from the head 11, a screw thread 13 protruding in a spiral shape from the surface of the nail body 12, and a drill bit 14 formed at the tip of the nail body 12. In addition, the drill bit 14 has a cross-sectional area along the center line A that occupies a ratio of 1 / 4 and a V-shaped chip discharge groove 15 recessed at 90 degrees so that cracks do not occur when the screw nail 1 is screwed into a wooden workpiece.

[0003] When the screw nail 1 is used for fastening, the drill bit 14 is first pressed against the surface of the wooden workpiece, and then the screw nail 1 is rotated by applying force to the head 11 with an electric tool, so that the drill bit 14 is screwed into the wooden workpiece. However, when the screw nail 1 is screwed, the capacity of the V-shaped chip discharge groove 15 is too small, so that the chips cut out when the screw nail 1 is screwed in cannot be smoothly discharged. Furthermore, when a strong screwing pressure is applied, the wooden workpiece is compressed through the screw thread 13 and the nail body 12, so that the expansion stress is concentrated, and the wooden workpiece is likely to be cracked due to the excessive pressure. If the crack occurs, the structural strength of the wooden workpiece is impaired and the effect of the screw fastening is also adversely affected. In particular, if a crack occurs on the surface of the wooden workpiece, the completeness of the workpiece and the stability as a product are greatly impaired. In addition, if the torque when the screw nail 1 is screwed in is too large, it may injure the operator's hand in the case of manual screwing.

[0004] Therefore, since the design of the V-shaped chip discharge groove 15 of the screw nail 1 is directly related to the quality of the wooden workpiece and the success of the processing, how to design a structure for discharging chips, how to prevent cracks from occurring in the wooden workpiece when it is screwed, how to reduce torque caused by friction, and how to improve the smoothness of chip discharge are major issues that must be resolved by screw manufacturers. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Taiwan Utility Model Publication No. 557967 Summary of the Invention [Problem to be solved by the invention]

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a screw nail capable of optimizing the performance of discharging wood chips when screwed in and reducing the torque. [Means for solving the problem]

[0007] In view of the above problems, the present invention provides a screw nail having a head and a nail body in which a columnar portion extending from the head along a predetermined axis and a drill bit at the tip of the columnar portion are formed, wherein the nail body is formed with a screw thread that protrudes in a spiral shape and a plurality of debris discharge grooves, each of which has an inclination angle with respect to the axis within a range of 5 degrees to 35 degrees, and among the plurality of debris discharge grooves, at least two of the debris discharge grooves are parallel to each other.

[0008] The present invention also provides a screw nail having a head and a nail body in which a columnar portion extending from the head along a predetermined axis and a drill bit at the tip of the columnar portion are formed, wherein the nail body is formed with a screw thread that protrudes in a spiral shape and two non-parallel debris discharge grooves, and each of the debris discharge grooves has an inclination angle with respect to the axial direction within a range of 5 degrees to 35 degrees. Effect of the Invention

[0009] As described above, the screw nail of the present invention provides excellent wood chip discharge performance in response to the screwing of the drill bit and the screw thread of the nail body by optimizing the inclination angle of the chip discharge groove, and thus the torque required for screwing is reduced, resulting in the effect of saving time and manpower during construction. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a side view showing an example of a conventional screw nail. [Diagram 2] 1 is a side view showing the configuration of a first embodiment of a screw nail according to the present invention. FIG. [Figure 2-1] FIG. 3 is a partially enlarged explanatory view of FIG. 2, illustrating two debris discharge grooves of the first embodiment. [Diagram 3] 1 shows the configuration of a second embodiment of the screw of the present invention and a number of ribs of said second embodiment. [Figure 3-1] FIG. 4 is a partially enlarged explanatory view of FIG. 3, illustrating the debris discharge groove and a plurality of ribs of the second embodiment. [Figure 3-2] 13A and 13B are side views illustrating an embodiment in which a plurality of ribs are formed in different shapes. [Figure 4] FIG. 4 is a partially enlarged view similar to FIG. 3, showing another example of the second embodiment. [Diagram 5] FIG. 4 is a side view showing a third embodiment of the screw nail of the present invention. [Figure 5-1] FIG. 6 is a side view similar to FIG. 5, showing another implementation of the third embodiment. [Figure 5-2] FIG. 6 is a side view similar to FIG. 5, showing another implementation of the third embodiment. [Figure 5-3] FIG. 6 is a side view similar to FIG. 5, showing another implementation of the third embodiment. [Figure 5-4] FIG. 6 is a side view similar to FIG. 5, showing another implementation of the third embodiment. [Figure 5-5] FIG. 6 is a side view similar to FIG. 5, showing another implementation of the third embodiment. [Figure 5-6] FIG. 6 is a side view similar to FIG. 5, showing another implementation of the third embodiment. [Figure 5-7] FIG. 6 is a side view similar to FIG. 5, showing another implementation of the third embodiment. [Figure 6] FIG. 11 is a side view showing a fourth embodiment of the screw nail of the present invention. [Figure 6-1] FIG. 7 is a side view similar to FIG. 6, showing another example of the fourth embodiment. [Figure 6-2] FIG. 7 is a side view similar to FIG. 6, showing another example of the fourth embodiment. [Figure 6-3] FIG. 7 is a side view similar to FIG. 6, showing another example of the fourth embodiment. [Figure 6-4] FIG. 7 is a side view similar to FIG. 6, showing another example of the fourth embodiment. [Figure 6-5] FIG. 7 is a side view similar to FIG. 6, showing another example of the fourth embodiment. [Figure 6-6] FIG. 7 is a side view similar to FIG. 6, showing another example of the fourth embodiment. [Figure 6-7] FIG. 7 is a side view similar to FIG. 6, showing another example of the fourth embodiment. [Figure 7]FIG. 11 is a side view showing a fifth embodiment of the screw nail of the present invention. [Figure 7-1] FIG. 8 is a side view similar to FIG. 7, showing another example of the fifth embodiment. [Figure 7-2] FIG. 8 is a side view similar to FIG. 7, showing another example of the fifth embodiment. [Figure 7-3] FIG. 8 is a side view similar to FIG. 7, showing another example of the fifth embodiment. [Figure 8] FIG. 13 is a side view showing a sixth embodiment of the screw nail of the present invention. [Figure 8-1] FIG. 9 is a side view similar to FIG. 8, showing another implementation of the sixth embodiment. [Figure 8-2] FIG. 9 is a side view similar to FIG. 8, showing another implementation of the sixth embodiment. [Figure 8-3] 9 is an enlarged view similar to FIG. 8, showing another implementation of the sixth embodiment; [Figure 8-4] FIG. 9 is a side view similar to FIG. 8, showing another implementation of the sixth embodiment. [Figure 8-5] FIG. 9 is a side view similar to FIG. 8, showing another implementation of the sixth embodiment. [Figure 9] FIG. 13 is a side view showing a seventh embodiment of the screw nail of the present invention. [Figure 10-1] 5A to 5C are cross-sectional explanatory views showing different shapes of the cross section of the debris discharge groove. [Figure 10-2] 5A to 5C are cross-sectional explanatory views showing different shapes of the cross section of the debris discharge groove. [Figure 10-3] 5A to 5C are cross-sectional explanatory views showing different shapes of the cross section of the debris discharge groove. [Figure 10-4] 5A to 5C are cross-sectional explanatory views showing different shapes of the cross section of the debris discharge groove. [Figure 10-5] 5A to 5C are cross-sectional explanatory views showing different shapes of the cross section of the debris discharge groove. [Figure 10-6] 5A to 5C are cross-sectional explanatory views showing different shapes of the cross section of the debris discharge groove. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Before describing the present invention in more detail, it should be noted that, where considered appropriate, the same reference numbers have been repeated among the figures to indicate elements having similar characteristics or functionality.

[0012] The screw of the present invention will now be described in more detail with reference to the accompanying drawings.

[0013] As shown in FIG. 2, the first embodiment of the screw nail of the present invention has a head 2, a nail body 3 extending from the head 2 along an axis Z, a screw thread 4 formed so as to protrude spirally from the nail body 3, and two debris discharge grooves 5 formed in the nail body 3 so as to be spaced apart from each other.

[0014] Here, the nail body 3 has a pillar portion 31 and a drill bit 32 connected to one end of the pillar portion 31. The drill bit 32 is roughly cone-shaped, and generates a screwing effect together with the screw thread 4 when the nail body 3 is rotated by the rotational driving force applied from the head 2.

[0015] 2 and 2-1, each of the dust discharge grooves 5 has an inclination angle α with respect to the axis Z in the range of 5 degrees to 35 degrees, and the depth of the dust discharge groove 5 is preferably half the outer diameter of the screw thread 4, and at least one of the dust discharge grooves 5 extends to the drill bit 32 of the nail body 3. Here, the width of the upper dust discharge groove 5 perpendicular to its own extension direction is in the range of 0.3 to 4.5 times the width of the lower dust discharge groove 5 perpendicular to its own extension direction, and the distance between the dust discharge grooves 5 is at least 0.3 mm, and the projection ranges on a virtual plane perpendicular to the axis Z at least partially overlap (see FIG. 2-1). The distance between the dust discharge grooves 5 is actually set according to the inclination angle and the outer diameter of the nail body 3. In addition, although the first embodiment is exemplified by a configuration having two debris discharge grooves 5, in reality a configuration having three or more debris discharge grooves 5 is also possible, and a configuration in which at least two debris discharge grooves 5 are parallel to each other and located on the same side is a relatively preferred embodiment.

[0016] In addition, if the depth of the waste discharge groove 5 is greater than half the thread outer diameter of the screw thread 4, the demand for a larger amount of waste discharge can be met, but the nail body 3 is cut too deeply and becomes thin, which affects the overall structural strength. The strength of the nail body 3 can be strengthened by heat treatment in the subsequent process, but the nail body 3 becomes too hard after heat treatment, so it is brittle and may break. On the other hand, if the depth of the waste discharge groove 5 near the tip of the nail body 3 is less than half the thread outer diameter of the screw thread 4, the overall structural strength can be strengthened, but the effect of discharging and storing wood chips is relatively less ideal. In addition, when processing with a cutting blade having the same outer diameter, if the depth of the waste discharge groove 5 near the tip of the nail body 3 is half the thread outer diameter of the screw thread 4, the waste discharge groove 5 above it will not be half the thread outer diameter of the screw thread 4 because the depth of the cut will differ due to the influence of the distance and inclination angle between the waste discharge groove 5 below it. Although Figures 2 and 2-1 show an example in which each debris discharge groove 5 is formed with cutting blades having the same outer diameter, within the scope of application of the present invention, it is possible to use different cutting blades for debris discharge grooves 5 in different positions, and is not limited to this.

[0017] In Table 1 below, in control experiment 1, the two dregs discharge grooves 5 are parallel to each other and both have an inclination angle of less than 5 degrees, and in control experiment 2, the two dregs discharge grooves 5 are parallel to each other and both have an inclination angle of more than 35 degrees.

[0018] [Table 1]

[0019] According to the experimental data shown in Table 1, the optimization of the inclination angle of each of the chip discharge grooves 5 in the first embodiment provides excellent chip discharge performance in accordance with the screwing of the drill bit 32 of the nail body 3 and the screw thread 4, thereby improving the chip discharge ability when the screw nail of the present invention is screwed in, and reliably and significantly reducing the torque required when screwing in, thereby saving time and manpower during construction. It is worth noting that, according to the different sizes of the different types of screw nails, and the different types of wood to be screwed in and the different application fields, the width of each chip discharge groove 5 is adjusted and the optimized angle of each chip discharge groove 5 is adjusted to achieve the purpose of optimizing the resistance force generated when screwing in. To further explain, the initial width of the waste discharge groove 5 near the tip of the nail body 3 is set according to the outer diameter and inclination angle of the screw thread 4. For example, if the outer diameter of a normal screw is 8 mm, the width of the waste discharge groove 5 near the tip of the nail body 3 is in the range of 2.5 to 8.5 mm and has a predetermined ratio. An appropriate width is selected according to the demand or the type of wood to be screwed. In the absence of a specific demand, the initial width is half the outer diameter of the screw, and the waste discharge groove 5 above it is further set according to the width of the waste discharge groove 5 near the tip of the nail body 3. In addition, the torque required to perform screwing using this first embodiment is relatively low, so that the possibility of cracks occurring when applied to a wooden workpiece can be reduced, thereby improving the processing quality when using this first embodiment. In addition, although the data shown in Table 1 varies depending on the type, hardness, and other parameters of the wooden workpiece, the direction of the torque value according to the optimized inclination angle is not affected by these, so that the data here also proves that this first embodiment exerts the expected effect.

[0020] FIG. 3 shows a second embodiment of the screw nail of the present invention. The difference between the first embodiment and the second embodiment is that the second embodiment further includes a plurality of ribs 6 formed between adjacent structures of the screw thread 4, and the position of each of the waste discharge grooves 5 relative to the drill bit 32 is adjusted accordingly as shown in FIG. 3-1. When adding a plurality of ribs 6 between adjacent structures of the screw thread 4, these ribs 6 can be inclined with respect to the axis Z or parallel to the axis Z, which can also achieve the purpose of optimizing the expansion effect on the hole, and the expansion effect on the hole synergistically reduces the screw-in resistance. In addition, the extension direction of the ribs 6 can be the same as or opposite to each of the waste discharge grooves 5, and is not limited to the configuration shown in FIG. 3 or FIG. 3-1. Furthermore, as shown in Figures 3 and 3-1, each rib 6 is formed at the position where each debris discharge groove 5 intersects, and as shown in Figure 3-2, by configuring another part of each rib 6 to be close to the head 2, the expansion effect on the hole can be further optimized.

[0021] Another example of the second embodiment is shown in FIG. 4, which differs from the example shown in FIG. 3 in that the extension direction of each of the debris discharge grooves 5 is opposite. The inclination angle of each of the debris discharge grooves 5 in the example shown in FIG. 4 is the same as that of the example shown in FIG. 3, so that it can correspond to the drill bit 32 and the screw thread 4, and when screwed in, the same optimization effect as that of the example shown in FIG. 3 can be obtained. In addition, if multiple ribs 6 are added between some adjacent structures of the screw thread 4, the effect of optimizing the expansion effect on the hole can be obtained. In addition, the extension direction of the ribs 6 can be the same as or opposite to that of each of the debris discharge grooves 5, and an example of the opposite direction is shown in FIG. 4.

[0022] FIG. 5 shows a third embodiment of the screw nail of the present invention. The difference between the third embodiment and the first embodiment is that the drill bit 32 has two cutting surfaces 321 facing opposite sides, and the effect of the cutting surfaces 321 corresponds to the effect of each of the debris discharge grooves 5. As shown in FIG. 5 and FIG. 5-1 to FIG. 5-7, the cutting surfaces 321 are formed to face opposite sides and parallel to each other according to demand, and the inclination angle of each of the debris discharge grooves 5 is optimized to obtain the effect of reducing the torque equivalent to the first embodiment. Similarly, it is a relatively excellent embodiment that the projection ranges of each of the debris discharge grooves 5 projected on a virtual plane perpendicular to the axis Z at least partially overlap each other (see FIG. 5), and the projection ranges of the cutting surfaces 321 projected on a virtual plane perpendicular to the axis Z overlap with one of the debris discharge grooves 5. As shown in Fig. 5, Fig. 5-1 to Fig. 5-3, each cutting surface 321 may have a shape extending at a right angle, a chamfer, an inclined shape, or a curved shape, and may start cutting immediately from the columnar part 31 of the nail body 3 and extend to the position of the drill bit 32. Alternatively, each cutting surface 321 may be completely formed on the drill bit 32 of the nail body 3 as shown in Fig. 5-4 to Fig. 5-7. The projection range of the cutting surface 321 projected on a virtual plane perpendicular to the axis Z overlaps with at least one of the waste discharge grooves 5, and the projection range shown in Fig. 5, Fig. 5-2, Fig. 5-4, and Fig. 5-6 are relatively excellent embodiments. As a supplementary explanation, Fig. 5, Fig. 5-1 to Fig. 5-7 show an example of each waste discharge groove 5 processed by cutting blades with different outer diameters when simultaneously processed, but the application range of the present application can also be used by selecting cutting blades with the same outer diameter, and is not limited to this.

[0023] FIG. 6 shows a fourth embodiment of the screw nail of the present invention. The difference between the fourth embodiment and the first embodiment is that the drill bit 32 of the nail body 3 has two cutting surfaces 321 facing opposite sides, and the two debris discharge grooves 5 are formed on opposite sides of the nail body 3, and are connected to the cutting surfaces 321. That is, the fourth embodiment employs a drill bit 32 having a different shape from that of the first embodiment, and by adjusting the positions of the debris discharge grooves 5 and using the cutting surfaces 321 on opposite sides, the cutting performance can be further optimized. In addition, by optimizing the inclination angle of each debris discharge groove 5 in the same manner as above, the same effect as the first embodiment can be obtained. Among them, as shown in FIG. 6-1 to FIG. 6-3, each cutting surface 321 may have a shape that is right-angled, chamfered, extends in an inclined manner, or extends in a curved manner, and starts cutting immediately from the columnar part 31 of the nail body 3 and extends to the position of the drill bit 32. What should be particularly noted here is that, in addition to the fact that the projection ranges of each debris discharge groove 5 in a virtual plane perpendicular to the axis Z overlap with each other, the projection range of the cutting surface 321 in a virtual plane perpendicular to the axis Z overlaps with at least one of the debris discharge grooves 5, as shown in Figure 6-2, thereby providing even better wood chip discharge effect.

[0024] Also, as shown in Figs. 6-4 to 6-7, each cutting surface 321 can be completely formed on the drill bit 32 of the nail body 3. When each cutting surface 321 is completely formed on each drill bit 32 of the nail body 3, it is possible to configure each chip discharge groove 5 not to be connected to each cutting surface 321, but when each chip discharge groove 5 is connected to each cutting surface 321, a better chip discharge performance can be obtained. Furthermore, as shown in Figs. 6, 6-1, 6-2, and 6-3, it is a relatively excellent embodiment that the projection range of the cutting surface 321 on a virtual plane perpendicular to the axis Z overlaps with at least one of the chip discharge grooves 5. Furthermore, in this fourth embodiment, each chip discharge groove 5 located on different sides of the nail body 3 may or may not be parallel to each other, and if optimized according to parameters, it is possible to reduce the resistance and achieve an optimal chip discharge effect.

[0025] FIG. 7 shows a fifth embodiment of the screw nail of the present invention, and the difference between this fifth embodiment and the fourth embodiment is that the two waste discharge grooves 5 are formed parallel to each other in the nail body 3, which is advantageous in the manufacturing process and reduces manufacturing costs. Similarly, in the configuration in which the drill bit 32 has only one cutting surface 321, the relative positions of the cutting surface 321 and each waste discharge groove 5 can be changed as necessary with respect to the position of each waste discharge groove 5, and by optimizing the inclination angle of each waste discharge groove 5, the effect of suppressing torque can be achieved in the same way as in the first embodiment, and the configuration is not limited to the configuration having only one cutting surface 321 shown in FIG. 7, 7-1 to 7-3. Note that a relatively excellent embodiment is one in which the projection range of the cutting surface 321 on a virtual plane perpendicular to the axis Z overlaps with at least one of the waste discharge grooves 5. As a supplementary explanation, FIG. 7, 7-1 to 7-3 show an example in which the waste discharge grooves 5 are processed by cutting blades with different outer diameters when processed simultaneously.

[0026] 8 shows a sixth embodiment of the screw nail of the present invention, and the difference between this sixth embodiment and the third embodiment is that in each of the chip discharge grooves 5, only one chip discharge groove 5 is connected to one in each cutting surface 321, and at least one chip discharge groove 5 extends in a spiral shape on the columnar part 31 of the nail body 3. Compared with the third embodiment, in this sixth embodiment shown in FIG. 8 and FIG. 8-3, one chip discharge groove 5 extends in a spiral shape for a relatively long distance on the columnar part 31 of the nail body 3, so that a wider space for discharging / accommodating chips can be provided, and the chip discharge performance can be further optimized. In addition, in another embodiment shown in Figures 8-1 and 8-4, a configuration is shown in which two debris discharge grooves 5 both extend spirally into the columnar portion 31, and in yet another embodiment shown in Figures 8-2 and 8-5, not only do both debris discharge grooves 5 extend spirally into the columnar portion 31, but the directions in which they extend spirally are opposite to each other.

[0027] 9 shows a seventh embodiment of the screw nail of the present invention, and the difference between this seventh embodiment and the first embodiment is that, of the two debris discharge grooves 5, one of the debris discharge grooves 5 has an inclination angle of 5 degrees with respect to the axis Z, and the other of the debris discharge grooves 5 has an inclination angle of 25 degrees with respect to the axis Z. Here, the two debris discharge grooves 5 are formed on the same side of the nail body 3 with respect to the axis Z, but it is of course possible for the two debris discharge grooves 5 to be formed on different sides of the nail body 3 with respect to the axis Z, and the present invention is not limited to this.

[0028] In Table 2 below, in control experiment 1, the two debris discharge grooves 5 are not parallel to each other and both have an inclination angle of less than 5 degrees, and in control experiment 2, the two debris discharge grooves 5 are not parallel to each other and both have an inclination angle of greater than 25 degrees.

[0029] [Table 2]

[0030] According to the experimental data shown in Table 2, the optimization of the inclination angle of each of the chip discharge grooves 5 of the seventh embodiment provides excellent chip discharge performance in accordance with the screwing of the drill bit 32 of the nail body 3 and the screw thread 4, thereby improving the chip discharge ability when the screw nail of the present invention is screwed in, and reliably and significantly reducing the torque required when screwing in, thereby saving time and manpower during construction. It is worth noting that even in a situation where the chip discharge grooves 5 are not parallel to each other, a relatively excellent chip discharge effect can be obtained by selecting each inclination angle within the range of 5 to 25 degrees.

[0031] As described for each of the above embodiments, in addition to optimizing the inclination angle of each of the dust discharge grooves 5, the configuration related to the drill bit 32, such as the spiral extension of each of the dust discharge grooves 5, the difference in width of each of the dust discharge grooves 5, and the distance between each of the dust discharge grooves 5, can be designed according to different needs as described for each of the embodiments. Therefore, in addition to the effect of saving time and manpower by reducing the torque brought about by the parameter optimization of the screw nail of the present invention, various needs can be met by adjusting the configuration change of the drill bit 32 and the extension direction, difference in width, and distance between the grooves of each of the dust discharge grooves 5. In addition, when cutting and forming each of the dust discharge grooves 5, the bottom of each of the dust discharge grooves 5 can be formed so that the cross-sectional shape is right-angled, chamfered, or inclined, as shown in Figures 10-1 to 10-6, depending on the difference in the cutting blade used for processing.

[0032] Although the embodiments of the present invention have been described above, the present invention is not limited to these, and encompasses all modifications and equivalent configurations as various configurations falling within the spirit and scope of the broadest interpretation. [Industrial Applicability]

[0033] As described above, the screw nail of the present invention can provide excellent wood chip discharge performance by optimizing the inclination angle for each debris discharge groove 5, in accordance with the cut made by the drill bit 32 and the screw thread 4 in the nail body 3. Furthermore, various demands can be met by matching the shape of the drill bit 32 and the extension direction, width and distance difference between each debris discharge groove 5. This increases the wood chip discharge ability of the screw nail of the present invention when it is screwed in, and reduces the torque required when screwing in, thereby saving the time and manpower required for construction, thereby reliably achieving the object of the present invention. [Configuration 1] A screw nail having a head, a columnar portion extending from the head along a predetermined axis, and a nail body having a drill bit at the tip of the columnar portion, the nail body being formed with a screw thread protruding in a spiral shape and a plurality of debris discharge grooves; The screw nail is characterized in that each of the debris discharge grooves has an inclination angle with respect to the axis line within a range of 5 degrees to 35 degrees, and at least two of the plurality of debris discharge grooves are parallel to each other. [Configuration 2] The screw nail according to configuration 1, characterized in that the two parallel debris discharge grooves are formed on the same side of the nail body with respect to the axis line. [Configuration 3] The screw nail according to claim 1, characterized in that the drill bit is formed with one cutting surface. [Configuration 4] The screw nail according to claim 2, characterized in that the drill bit is formed with one cutting surface. [Configuration 5] The screw nail according to claim 1, characterized in that the drill bit is formed with two cutting surfaces facing opposite sides to each other. [Configuration 6] The screw nail according to configuration 2, characterized in that the drill bit is formed with two cutting surfaces facing opposite sides to each other. [Configuration 7] The screw nail according to any one of configurations 1 to 6, wherein the plurality of debris discharge grooves at least partially overlap one another within a projection area projected onto an imaginary plane perpendicular to the axis. [Configuration 8] The screw nail according to any one of Configurations 3 to 6, wherein at least one of the plurality of debris discharge grooves is connected to the cutting surface. [Configuration 9] The screw nail according to any one of Configurations 3 to 6, wherein each of the cutting surfaces has a shape that is right-angled, chamfered, extends in an inclined manner, or extends in a curved manner. [Configuration 10] The screw nail according to configuration 5, characterized in that it has two of the debris discharge grooves, each connected to one of the cutting surfaces. [Configuration 11] The screw nail according to configuration 6, characterized in that it has two of the debris discharge grooves, each connected to one of the cutting surfaces. [Configuration 12] The screw nail according to configuration 5, characterized in that it has two of the debris discharge grooves formed on different sides of the nail body and each connected to each of the cutting surfaces. [Configuration 13] The screw nail according to configuration 6, characterized in that it has two of the debris discharge grooves formed on different sides of the nail body and each connected to each of the cutting surfaces. [Configuration 14] The screw nail according to configuration 3, wherein a projection range of the cutting surface projected on a virtual plane perpendicular to the axis overlaps with a range of at least one of the debris discharge grooves. [Configuration 15] The screw nail according to configuration 4, wherein a projection range of the cutting surface projected on a virtual plane perpendicular to the axis overlaps with a range of at least one of the debris discharge grooves. [Configuration 16] The screw nail according to configuration 5, wherein the cutting surface has a projection range projected on a virtual plane perpendicular to the axis that overlaps with the range of at least one of the debris discharge grooves. [Configuration 17] The screw nail according to configuration 6, wherein the cutting surface has a projection range projected on a virtual plane perpendicular to the axis that overlaps with the range of at least one of the debris discharge grooves. [Configuration 18] The screw nail according to configuration 5, wherein one end of the cutting surface is directly connected to the pillar portion. [Configuration 19] The screw nail according to configuration 6, wherein one end of the cutting surface is directly connected to the pillar portion. [Configuration 20] The screw nail according to configuration 5, characterized in that there is a gap between one end of the cutting surface and the post-shaped portion. [Configuration 21] The screw nail according to configuration 6, characterized in that there is a gap between one end of the cutting surface and the post-shaped portion. [Configuration 22] The screw nail according to any one of configurations 1 to 6 or 10 to 21, wherein the bottom of each of the debris discharge grooves has a cross-sectional shape that is right-angled, chamfered, or inclined. [Configuration 23] The screw nail according to any one of Configurations 1 to 6 or Configurations 10 to 21, wherein at least one of the debris discharge grooves is formed in the nail body so as to extend in a spiral shape. [Configuration 24] The screw nail according to configuration 7, wherein at least one of the debris discharge grooves is formed in the nail body so as to extend in a spiral shape. [Configuration 25] The screw nail according to any one of Configurations 1 to 6 or Configurations 10 to 21, wherein at least one of the debris discharge grooves is formed in the drill bit of the nail body. [Configuration 26] The screw nail according to configuration 7, wherein at least one of the debris discharge grooves is formed in the drill bit of the nail body. [Configuration 27] The screw nail according to any one of configurations 1 to 6 or 10 to 21, wherein at least one of the debris discharge grooves is formed in the columnar portion of the nail body. [Configuration 28] The screw nail according to configuration 7, wherein at least one of the debris discharge grooves is formed in the columnar portion of the nail body. [Configuration 29] The screw nail according to any one of Configurations 1 to 6, comprising two of the debris discharge grooves, wherein the width of the upper debris discharge groove perpendicular to its extension direction of the two debris discharge grooves is within a range of 0.3 to 4.5 times the width of the lower debris discharge groove perpendicular to its extension direction of the two debris discharge grooves. [Configuration 30] The screw nail according to configuration 7, comprising two of the debris discharge grooves, wherein the width of the upper debris discharge groove perpendicular to its extension direction of the two debris discharge grooves is within a range of 0.3 to 4.5 times the width of the lower debris discharge groove perpendicular to its extension direction of the two debris discharge grooves. [Configuration 31] The screw nail according to any one of configurations 1 to 6 or 10 to 21, wherein the depth to which the debris discharge groove is cut at the tip side of the nail body is half the outer diameter of the screw thread. [Configuration 32] The screw nail according to any one of configurations 1 to 6 or 10 to 21, wherein the depth to which all of the debris discharge grooves are cut is half the outer diameter of the screw thread. [Configuration 33] The screw nail according to configuration 7, characterized in that the depth to which the debris discharge groove on the tip side of the nail body is cut is half the outer diameter of the screw thread. [Configuration 34] The screw nail according to configuration 7, characterized in that the depth to which all of the debris discharge grooves are cut is half the outer diameter of the screw thread. [Configuration 35] The screw nail according to any one of configurations 1 to 6 or 10 to 21, further comprising a plurality of ribs formed between adjacent structures of a portion of the screw thread, each of the ribs being inclined with respect to the axis. [Configuration 36] The screw nail according to configuration 7, further comprising a plurality of ribs formed between adjacent structures of a portion of the screw thread, each of the ribs being inclined with respect to the axis. [Configuration 37] The screw nail according to any one of configurations 1 to 6 or 10 to 21, further comprising a plurality of ribs formed between adjacent structures of a portion of the screw thread, each of the ribs being parallel to the axis. [Configuration 38] The screw nail according to configuration 7, further comprising a plurality of ribs formed between adjacent structures of a portion of the screw thread, each of the ribs being parallel to the axis. [Configuration 39] 36. The screw nail according to claim 35, wherein at least a portion of the plurality of ribs intersects with each of the debris discharge grooves. [Configuration 40] 37. The screw nail according to claim 36, wherein at least a portion of the plurality of ribs intersects with each of the debris discharge grooves. [Configuration 41] 38. The screw nail according to claim 37, wherein at least a portion of the plurality of ribs intersects with each of the debris discharge grooves. [Configuration 42] 39. The screw nail according to claim 38, wherein at least a portion of the plurality of ribs intersects with each of the debris discharge grooves. [Configuration 43] 40. The screw of claim 39, wherein another portion of the plurality of ribs is close to the head. [Configuration 44] 41. The screw of claim 40, wherein another portion of the plurality of ribs is adjacent to the head. [Configuration 45] 42. The screw nail according to claim 41, wherein another portion of the plurality of ribs is close to the head. [Configuration 46] 43. The screw as described in configuration 42, wherein another portion of the plurality of ribs is adjacent to the head. [Configuration 47] The screw nail according to configuration 39, characterized in that another portion of the plurality of ribs is close to the tip side of the column portion of the nail body. [Configuration 48] The screw nail according to configuration 40, wherein another portion of the plurality of ribs is close to the tip side of the column portion of the nail body. [Configuration 49] 42. The screw nail according to configuration 41, wherein another portion of the plurality of ribs is close to the tip side of the column portion of the nail body. [Configuration 50] 43. The screw nail according to configuration 42, wherein another portion of the plurality of ribs is close to the tip side of the column portion of the nail body. [Configuration 51] The screw nail according to any one of Configurations 3 to 6, wherein the debris discharge groove closest to the cutting surface at least partially overlaps with the cutting surface in a projection range projected on a virtual plane perpendicular to the axis. [Configuration 52] The screw nail according to any one of configurations 3 to 6, wherein the two debris discharge grooves closest to the cutting surface at least partially overlap with the cutting surface in a projection range projected on a virtual plane perpendicular to the axis. [Configuration 53] 24. The screw nail according to configuration 23, wherein the depth of the chip discharge groove on the tip side of the nail body is half the outer diameter of the screw thread. [Configuration 54] The screw nail according to configuration 5 or 6, wherein the two cutting surfaces are arranged parallel to each other. [Configuration 55] A screw nail having a head, a columnar portion extending from the head along a predetermined axis, and a nail body having a drill bit at the tip of the columnar portion, wherein a screw thread protruding in a spiral shape and two non-parallel debris discharge grooves are formed on the nail body, The screw nail, wherein each of the debris discharge grooves has an inclination angle with respect to the axis line within a range of 5 degrees to 25 degrees. [Configuration 56] The screw nail according to configuration 55, wherein the two debris discharge grooves overlap at least partially with each other in a projection range projected on a virtual plane perpendicular to the axis. [Configuration 57] 57. The screw nail according to configuration 55 or 56, wherein the two debris discharge grooves are formed on the same side of the nail body relative to the axis. [Configuration 58] The screw nail according to configuration 55 or 56, wherein the two debris discharge grooves are formed on opposite sides of the nail body relative to the axis. [Explanation of symbols]

[0034] 2 Head 3 Nail body 31 Columnar part 32 Drill Bit 321 Cutting surface 4 Screw Thread 5 Trash discharge ditch 6. Ribs α Incline angle Z axis

Claims

1. A screw nail having a head, a columnar portion extending from the head along a predetermined axis, and a nail body having a drill bit at the tip of the columnar portion, the nail body being formed with a screw thread protruding in a spiral shape and two non-parallel debris discharge grooves, The screw nail is characterized in that each of the debris discharge grooves has an inclination angle with respect to the axis line within a range of 5 degrees to 25 degrees.

2. The screw nail according to claim 1, characterized in that the two debris discharge grooves at least partially overlap each other in a projection area projected onto an imaginary plane perpendicular to the axis.

3. 3. The screw nail according to claim 1, wherein the two debris discharge grooves are formed on the same side of the nail body with respect to the axis line.

4. 3. The screw nail according to claim 1, wherein the two debris discharge grooves are formed on opposite sides of the nail body with respect to the axis.

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