JP2016070299A - nail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nail capable of being surely driven to a driven material without buckling, and further capable of maintaining a driven state for a long term.SOLUTION: A nail has a head part, a trunk part and a tip part. The trunk part includes: a recess part; a first projection part that projects with respect to the recess part in a radial direction orthogonal to a driving direction from the head part toward the tip part, and of which the length in the radial direction decreases toward the driving direction; and a second projection part that projects with respect to the recess part in the radial direction, and of which the length in the radial direction increases toward the driving direction. The recess part is connected to at least one of the upstream side in the driving direction of the first projection part and the downstream side in the driving direction of the second projection part.SELECTED DRAWING: Figure 1(a)

Description

  The present invention relates to a nail that is fixed by being driven to a member to be attached.

  Conventionally, as shown in FIGS. 6A and 6B, a nail 500 having a plurality of frustoconical portions 503 in a body portion 502 is known. (For example, refer to Patent Document 1). Each frustoconical portion 503 is configured such that its diameter decreases in the nail driving direction. As shown in FIG. 6B, the upper part 531 of the truncated cone part 503 is connected to the lower part 532 of the adjacent truncated cone part 503.

JP-A-9-250526

  FIGS. 7A and 7B show a state when the nail 500 is driven into the workpiece 602. FIG. The upper portion 531 is in contact with a horizontal surface formed on the workpiece. Since this contact becomes a frictional resistance, even if an external force f1 in the direction opposite to the driving direction acts on the nail 500, the possibility that the nail 500 will come out is low.

  By the way, external forces in various directions act on the nail 500 due to vibration such as an earthquake and expansion and contraction of the material to be driven due to moisture absorption or drying of the material to be driven. When an external force f2 in the same direction as the driving direction is applied to the nail 500 as shown in FIG. 7C, the upper portion 531 does not serve as a resistance to the external force, so that the nail 500 may move in the driving direction. is there. In particular, vibrations and expansion and contraction of the material to be driven are likely to occur repeatedly. When such vibration, expansion, and contraction are repeated, the contact surface of the material to be driven with the nail 500 is deformed, and the possibility that the nail 500 is loosened with respect to the material to be driven increases. For example, when the nail 500 is used in a building, the earthquake resistance of the building may be reduced.

  Moreover, as shown in FIG.6 (b), the connection location 533 where the two truncated cone parts 503 are connected becomes an acute angle in side view. For this reason, when driving into the nail 500 and the workpieces 602 and 603, stress concentrates on the connection portion 533, and the nail may buckle.

  In view of such circumstances, the present invention provides a nail that can be reliably driven into a material to be driven without buckling and that can maintain the driven state for a long period of time.

  The present invention is a nail having a head portion, a body portion, and a tip portion, wherein the body portion protrudes from a recessed portion and the recessed portion, and the radial length decreases toward the driving direction. A first convex portion that protrudes in the radial direction from the concave portion, and a second convex portion whose length in the radial direction increases in the driving direction. Provided is a nail that is connected to at least one of a large diameter side and a large diameter side of the second convex portion.

  According to the above configuration, even when an external force parallel or opposite to the driving direction acts on the nail, the nail can be prevented from moving in the driven member. Further, since the concave portion is connected to at least one of the first convex portion on the upstream side in the driving direction and the second convex portion on the downstream side in the driving direction, the vicinity of the connection portion is used at the time of driving. This can prevent the nail from buckling.

  The concave portion has a concave connecting surface, and when the concave portion is connected to at least one of the large diameter side of the first convex portion and the large diameter side of the second convex portion, the concave portion is The angle formed between at least one surface of the first convex portion and the second convex portion and at least one surface of the first convex portion and the second convex portion and the concave portion connecting surface is 90. It is preferable that it is more than degree.

  With such a configuration, since the angle formed by at least one surface of the first convex portion and the second convex portion and the concave connecting surface is 90 degrees or more, the buckling of the nail during driving is suppressed. can do.

  It is preferable that at least one of the first convex portion and the second convex portion is a truncated cone shape whose length in the radial direction changes toward the driving direction.

  At least one of the first convex portion and the second convex portion has a length in the radial direction that changes with respect to a circumferential direction centering on a virtual axis that passes through the center of the concave portion and extends in the driving direction. Is preferred.

  According to such a configuration, when an external force parallel or opposite to the driving direction is applied to the nail, the resistance from the driven member against the external force can be set to an appropriate level.

    The body includes a plurality of the first protrusions, the second protrusions, and the recesses, and the body includes a small diameter side of one of the first protrusions and one of the second protrusions. It is preferable that a plurality of sets are connected to the small diameter side of the convex portion, and the plurality of sets are arranged in the driving direction with the concave portion interposed therebetween.

  The body includes a plurality of first protrusions, the second protrusions, and the recesses, and the body includes a plurality of first protrusions arranged in the driving direction. And a second set in which a plurality of the second convex portions are arranged in the driving direction are arranged in the driving direction with the concave portion interposed therebetween, and the concave portion is formed in the first set in the first set. It is preferable to be connected to at least one of a side of the convex portion where the large diameter is provided and a side where the large diameter of the second convex portion is provided in the second set.

  A nail that defines a virtual axis that passes through the center of the recess and extends in the driving direction, wherein the first protrusion has a first length that decreases in the radial direction toward the driving direction. A frustoconical portion, and a first deformed convex portion whose length in the radial direction changes with respect to a circumferential direction around the virtual axis, while the radial length decreases in the driving direction. And the second convex part has a second truncated cone part in which the length in the radial direction decreases in the driving direction, and the length in the radial direction decreases in the driving direction. And it is preferable to have the 1st deformation | transformation convex part from which the length of the said radial direction changes regarding the said circumferential direction.

  The material of the member to be driven may change in the driving direction. In such a case, the first and second frustoconical portions and the first and second deformable convex portions can be appropriately arranged with respect to the driving direction, and the resistance at the time of driving can be reduced according to the material. Can do.

  It is preferable that the body portion includes a plurality of the first convex portions, and the lengths of the large diameters of the plurality of first convex portions are different from each other. The material of the member to be driven may change in the driving direction. In such a case, since the maximum value of the length in the radial direction of the plurality of first protrusions can be changed, the resistance during driving can be reduced according to the material.

  It is preferable that the body portion includes a plurality of the second convex portions, and the lengths of the large diameters of the plurality of second convex portions are different from each other. The material of the member to be driven may change in the driving direction. In such a case, since the maximum value of the length in the radial direction of the plurality of second convex portions can be changed, the resistance at the time of driving can be reduced according to the material.

  According to the nail of the present invention, even if an external force parallel to or opposite to the driving direction acts on the nail, the nail can be prevented from moving in the driven member. Further, since the concave portion is connected to at least one of the first convex portion on the upstream side in the driving direction and the second convex portion on the downstream side in the driving direction, the vicinity of the connection portion is used at the time of driving. This can prevent the nail from buckling.

The side view of the nail in the 1st Embodiment of this invention. The elements on larger scale of Fig.1 (a). The figure which showed the state by which the nail in 1st Embodiment was driven into the to-be-driven member. The elements on larger scale of FIG. Sectional drawing of the nail driver loaded with the nail in 1st Embodiment. The side view of the nail in the 2nd Embodiment of this invention. The side view of the nail in the 3rd Embodiment of this invention. The elements on larger scale of Fig.5 (a). Sectional drawing of the nail in 3rd Embodiment. The side view of the conventional nail. The elements on larger scale of Fig.6 (a). The figure which showed the state by which the conventional nail was struck into the to-be-struck member. The elements on larger scale of Fig.7 (a). The elements on larger scale of Fig.7 (a).

  The nail 1 in the present embodiment will be described. In the following description, the term indicating the shape of the member and the term indicating the relationship between the members such as perpendicular, parallel, and vertical are not limited to their strict meaning but also deviated from the strict meaning within an allowable range. It is also included.

  As shown in FIGS. 1 and 2, the nail 1 in the embodiment of the present invention has a head portion 2, a trunk portion 3, and a tip portion 4. In the present embodiment, the head 2, the body 3, and the tip 4 are integrally molded. Hereinafter, the direction from the head 2 to the tip 4 is referred to as a driving direction d1. Therefore, the head 2, the body 3, and the tip 4 are arranged in the driving direction d1 in this order. In the present embodiment, the head 2, the body 3, and the tip 4 are each substantially circular in a sectional view taken along a plane perpendicular to the driving direction d 1, and each center is substantially the same as the shaft 11. I'm doing it.

  The body 3 has a plurality of protruding sets 60 and a plurality of recesses 50. The protruding sets 60 and the recesses 50 are alternately arranged in the driving direction d1. As shown in FIG. 1B, each protruding set 60 has a first frustoconical portion 30 and a second frustoconical portion 40.

  The first frustoconical portion 30 has a substantially frustoconical shape, and has an upper end portion 31, a lower end portion 32, and a side surface 33. The side surface 33 connects the surface of the upper end portion 31 and the surface of the lower end portion 32. Both the surface of the upper end part 31 and the surface of the lower end part 32 are planes orthogonal to the driving direction d1. The length of the first frustoconical portion 30 in the radial direction (the direction orthogonal to the driving direction d1) monotonously decreases in the driving direction d1, that is, from the upper end portion 31 toward the lower end portion 32. In other words, the side surface 33 is inclined so that the radial length decreases toward the driving direction d1. The outer diameter D31 (larger diameter side) of the upper end portion 31 is the maximum outer diameter of the first truncated cone portion 30, and the outer diameter D32 (smaller diameter side) of the lower end portion 32 is the smallest outer diameter of the first truncated cone portion 30. is there. The first frustoconical portion 30 corresponds to the first convex portion of the present invention.

  The second frustoconical portion 40 has a substantially frustoconical shape, and has an upper end portion 41, a lower end portion 42, and a side surface 43. The side surface 43 connects the surface of the upper end portion 41 and the surface of the lower end portion 42. Both the surface of the upper end part 41 and the surface of the lower end part 42 are planes orthogonal to the driving direction d1. The length of the second frustoconical portion 40 in the radial direction monotonously increases in the driving direction d1, that is, from the upper end portion 41 toward the lower end portion 42. In other words, the side surface 43 is inclined such that the radial length increases toward the driving direction d1. The outer diameter D41 (large diameter side) of the upper end portion 41 is the minimum outer diameter of the second truncated cone portion 40, and the outer diameter D42 (smaller diameter side) of the lower end portion 42 is the maximum outer diameter of the second truncated cone portion 40. is there. In the present embodiment, D31 is equal to D42, and D32 is equal to D41. Note that D31 and D42 need not be equal. The second frustoconical portion 30 corresponds to the second convex portion of the present invention.

  The recess 50 has a substantially cylindrical shape and has a side surface 51. That is, the outer diameter D50 of the recess 50 is constant. In other words, the side surface 51 extends in the driving direction d1. The outer diameter D50 is smaller than the outer diameters D31 and D42, and substantially coincides with the outer diameters D32 and D41 in the present embodiment.

  A lower end 32 of the first truncated cone 30 and an upper end 41 of the second truncated cone 40 are connected. As a result, one first frustoconical portion 30 and one second frustoconical portion are connected to form one protruding set 60. That is, as shown in FIG. 1A, a plurality of frustoconical protruding sets 60 are connected via the recess 50.

  As shown in FIG. 1B, the upper end portion 31 has a connection portion 35, and the connection portion 35 is connected to the end portion of the recessed portion 50 in the driving direction d <b> 1. The lower end portion 42 has a connection portion 45, and the connection portion 45 is connected to the recess 50. As described above, the surface of the upper end portion 31 and the surface of the lower end portion 42 are perpendicular to the driving direction d1, and the side surface 51 extends in the driving direction d1. Further, the surface of the upper end portion 31 is continuous with the side surface 51, and the surface of the lower end portion 42 is also continuous with the side surface 51. Therefore, the surface of the upper end portion 31 and the side surface 51 are orthogonal, and the surface of the lower end portion 42 and the side surface 51 are also orthogonal.

  The nail 1 is used by being loaded into a magazine 305 of a nailing machine 300 shown in FIG. 3, for example. The nailing machine 300 includes a main body 301 and a magazine 305. The main body 301 includes a piston 340, a rod 341 fixed to the piston 340, a nose 304, and a combustion unit 307. The magazine 305 is loaded with a plurality of nails 1. The nail 1 loaded in the magazine 305 is supplied to the nose 304. The piston 340 moves downward by the combustion and expansion of the mixed gas in the combustion unit 307. Accordingly, the rod 341 drives the nail in the nose 304 into a driven member (such as a mounting member 91 and a mounted member 92 described later). Although the combustion type nailer 300 has been described in the present embodiment, the nailing machine is not limited to the combustion type, and may be, for example, an electric type nailing machine or a compressed air type nailing machine. Good. Further, the nail 1 is not necessarily limited to that used for a nail driver.

  FIG. 2A shows a state in which the nail 1 is attached to the attachment member 91 such as a pillar. That is, the nail 1 is struck against the mounting member 91 and the mounted member 92. The mounting member 91 is, for example, plywood, and the mounted member 92 is, for example, a wooden pillar of a building. In addition, the material of the attachment member 91 and the member 92 to be attached may not be wooden, and may be concrete, for example.

  As shown in FIG. 2B, the attachment member 91 has a cross section formed with a surface 93 that contacts the upper end 31 and a surface 94 that contacts the lower end 42. Therefore, when an external force f1 opposite to the driving direction d1 acts on the nail 1, resistance is generated by the surface 93 coming into contact with the upper end portion 31. Thereby, it is possible to prevent the nail 1 from moving in the direction opposite to the driving direction d1. Further, when the external force f2 in the same direction as the driving direction d1 acts on the nail 1, resistance is generated by the surface 94 coming into contact with the lower end portion 42. Thereby, the nail 1 can be prevented from moving in the driving direction d1. Here, the resistance acting between the nail 1 and the mounted member 92 has been described, but the same resistance also acts on the mounting member 91.

  According to the configuration of the nail 1 of the above embodiment, for example, when an external force in various directions acts on the nail 1 due to an earthquake or the like, or when the mounting member 91 and the mounted member 92 repeat moisture absorption and drying. Even in the case of expansion and contraction, the nail 1 can be prevented from moving in the driving direction d1 and in the direction opposite to the driving direction d1. Therefore, when the nail 1 is driven into the driven member, the driven state can be maintained for a long time. For example, when the driven member is a part of a building, the earthquake resistance of the building can be maintained over a long period of time.

  In the connection between the first truncated cone portion 30 and the recess 50, the surface of the upper end portion 31 and the side surface 51 are orthogonal, and the surface of the lower end portion 42 and the side surface 51 are also orthogonal. That is, it is avoided that the angle between the members is an acute angle around the connection portions 35 and 45. For this reason, it is possible to avoid stress concentration on the connecting portions 35 and 45. Since concentration of stress is avoided, it is possible to avoid the nail 1 from buckling around the connecting portions 35 and 45 when the nail 1 is driven.

  Next, a nail 70 according to a second embodiment will be described with reference to FIG. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

  The nail 70 has a head 2, a body 72, and a tip 4. The body 72 has a plurality of protruding sets 73 and a plurality of recesses 50. The protruding sets 73 and the recesses 50 are alternately arranged in the driving direction d1. Each protruding set 73 has three first frustoconical portions 30 and three second frustoconical portions 40. That is, the three first frustoconical portions 30 are continuously arranged in the driving direction d1. Three second frustoconical portions 40 are also arranged continuously in the driving direction d1. Three downstream first conical trapezoidal portions 30 in the driving direction d1 (the smaller diameter side of the three most downstream first frustoconical portion 30 in the driving direction d1 in the driving direction d1). Two continuous second frustoconical sections 30 are connected. The recess 50 is connected to the larger diameter side of the first frustoconical portion 30 on the most upstream side in the driving direction d1 among the three continuous first frustoconical portions 30. Further, the recess 50 is connected to the larger diameter side of the second frustoconical portion 30 on the most downstream side in the driving direction d1 among the three continuous second frustoconical portions 40.

  Even with such a configuration, the same effects as those of the first embodiment can be obtained. In the second embodiment, the number of the first frustoconical portion 30 and the second frustoconical portion 40 in each projecting set 73 is three, but the number of each is not limited to three. It is sufficient that at least one of the first truncated cone part 30 and the second truncated cone part 40 is plural. Therefore, the number of the first frustoconical portions 30 and the number of the second frustoconical portions 40 in the protruding set 73 do not need to match. For example, in the protruding set 73, the number of the first truncated cone portions 30 may be two, and the number of the second truncated cone portions 40 may be four. Moreover, you may comprise so that the number of the 1st truncated cone part 30 and the number of the 2nd truncated cone part 40 may differ for each protrusion set 73. FIG.

  Next, a nail 80 according to a third embodiment will be described with reference to FIG. The nail 80 has a head part 2, a body part 82, and a tip part 4. The body portion 82 includes a plurality of protruding sets 83 and a plurality of concave portions 50. The protruding sets 83 and the recesses 50 are alternately arranged in the driving direction d1. Each protruding set 83 has a first convex portion 130 and a second convex portion 140.

  As shown in FIG. 5B, the first convex portion 130 has an upper end portion 131, a lower end portion 132, and a side surface 133. The side surface 133 connects the upper end 131 and the lower end 132.

  FIG.5 (c) is a cross section of the recessed part 50 in the plane orthogonal to the driving direction d1. FIG. 5C shows not only the cross section of the recess 50 but also the upper end 131 (lower end 142).

  The center of the first convex portion 130 is provided coaxially with the center of the concave portion 50. The first convex portion 130 has a substantially star shape on a plane orthogonal to the driving direction d1. In other words, the protrusion amount of the first convex portion 130 from the side surface 51 of the concave portion 50 changes in the circumferential direction. That is, as for the 1st convex part 130, the radius from the center is changing regarding the circumferential direction. The radius of the first convex portion 130 becomes the maximum radius R131 every 90 degrees in the circumferential direction, and becomes the minimum radius R132 at a position shifted by 45 degrees in the circumferential direction from the position of each maximum radius. In the present embodiment, the radius of the first protrusion 130 changes continuously.

  The shape of the second convex portion 140 in the plane perpendicular to the driving direction d1 is the same as that of the first convex portion. That is, the center of the second convex portion 140 is provided coaxially with the center of the concave portion 50. The second convex portion 140 has a substantially star shape on a plane orthogonal to the driving direction d1. In other words, the protrusion amount of the second convex portion 140 from the side surface 51 of the concave portion 50 changes in the circumferential direction. That is, the radius from the center of the second convex portion 140 changes in the circumferential direction. The radius of the second convex portion 140 becomes the maximum radius R131 every 90 degrees in the circumferential direction, and becomes the minimum radius R132 at a position shifted by 45 degrees in the circumferential direction from the position of each maximum radius. The radius of the 2nd convex part 140 is changing continuously.

  As described above, the radius of the first convex portion 130 changes in the circumferential direction. However, if the first convex portion 130 is at the same position in the circumferential direction, the radial length of the first convex portion 130 is directed toward the driving direction d1, that is, It decreases monotonously from the upper end 131 toward the lower end 132. In other words, the side surface 133 is inclined so that the radial length decreases toward the driving direction d1. If the same position in the circumferential direction, the outer diameter D131 (larger diameter side) of the upper end 131 is the maximum outer diameter of the first protrusion 130, and the outer diameter D132 (smaller diameter side) of the lower end 132 is the first. This is the minimum outer diameter of the convex portion 130.

  The second convex portion 140 has an upper end portion 141, a lower end portion 142, and a side surface 143. The side surface 143 connects the upper end portion 141 and the lower end portion 142. The upper end portion 141 and the lower end portion 142 are orthogonal to the driving direction d1. If the positions are the same in the circumferential direction, the radial length of the second convex portion 140 increases monotonously in the driving direction d1, that is, from the upper end portion 141 toward the lower end portion 142. In other words, the side surface 143 is inclined so that the radial length increases in the driving direction d1. If the positions are the same in the circumferential direction, the outer diameter D141 (small diameter side) of the upper end portion 41 is the minimum outer diameter of the second convex portion 140, and the outer diameter D142 (large diameter side) of the lower end portion 142 is the second convex portion. Is the maximum outer diameter. In the present embodiment, D131 is equal to D142 and D132 is equal to D141 at the same position in the circumferential direction. Note that D131 does not have to be equal to D142.

  By connecting the lower end portion 132 and the upper end portion 141, one first convex portion 130 and one second convex portion 140 are connected to form one protruding set 83. As shown in FIG. 5A, a plurality of protruding sets 83 are connected via the recess 50.

  The nail 80 according to the third embodiment also has the same effect as that of the first embodiment. However, as for the 1st convex part 130, the shape of the surface orthogonal to the driving direction d1 is a star shape. Therefore, the area of the upper end 131 and the lower end 142 is small compared to the first embodiment in which the shape of the same plane is a circle (the radius is the maximum radius R131), so that the resistance when driving the nail 80 is reduced. Is less than in the case of nail 1. Therefore, for example, even when the mounting member 91 and the mounted member 92 are made of a relatively hard material, the resistance during driving can be reduced.

  The nail according to the present invention is not limited to the embodiment described above, and various modifications and improvements can be made within the scope described in the claims.

  For example, in the third embodiment, a plurality of the first and second convex portions 130 and 140 are continuously arranged in the driving direction d1 like the first and second truncated cone portions 30 and 40 of the second embodiment. It may be provided.

  In the third embodiment, the shape of the surface of the first and second convex portions 130 and 140 perpendicular to the driving direction d1 is a star shape. However, the shape is not limited to the star shape, and changes in the circumferential direction. Any configuration may be used. Further, the change in the circumferential direction may be discontinuous.

  In addition, the first and second frustoconical portions 30 and 40 of the first embodiment may be arbitrarily combined with the first and second convex portions 130 and 140 in the third embodiment. . For example, when the mounting member 91 is made of a softer material than the mounted member 92, the first and second truncated cone parts 30 and 40 are provided at locations corresponding to the mounting member 91 in the driving direction d1, and the mounted member The first and second convex portions 130 and 140 may be provided at locations corresponding to 92. Since the first and second convex portions 130 and 140 with low resistance are driven into a hard member, the resistance during driving can be effectively reduced.

  Moreover, in the said embodiment, although the some protrusion set 60 was all the same size, you may change a size. For example, the lengths of the projecting groups 60 in the driving direction d <b> 1 are the same, but the lengths in the radial direction may be different for each projecting group 60. That is, the shape of the protruding set 60 is all similar when viewed from the driving direction d1, and the similarity ratio may be different depending on the position of the driving direction d1. That is, the large diameters of the first and second convex portions are different for each protruding set 60. For example, if the outer diameter of the protruding set 60 is a tapered shape that decreases toward the distal end portion 4, the resistance during driving can be reduced. Alternatively, if the length of the projecting set 60 in the radial direction is the largest in the vicinity of the center in the driving direction d1 of the trunk portion 3, the resistance to external force is increased while reducing the resistance during driving. Can do. Similarly to the protruding set 60, the sizes of the sets 73 and 83 may be changed.

  In the above embodiment, the surface of the upper end portion 31 and the side surface 51 are orthogonal, and the surface of the lower end portion 42 and the side surface 51 are also orthogonal. However, the surface of the upper end portion 31 and the side surface 51 need only be connected at an angle of 90 degrees or more, and the surface of the lower end portion 42 and the side surface 51 need only be connected at an angle of 90 degrees or more.

  Furthermore, in the embodiment, it is described that the diameters of D50 and D51 (FIG. 1A) are different, but the same diameter may be used. Here, D51 is the outer diameter of the portion adjacent to the downstream side of the head 2 in the driving direction d1.

1, 70, 80 Nail 2 Head portion 3, 72, 83 Body portion 4 Tip portion 60, 73, 84 Projection set 30 First truncated cone portion 40 Second truncated cone portion 50 Recessed portion 130 First convex portion 140 Second convex portion

Claims (9)

A nail having a head, a torso, and a tip,
The trunk is
A recess,
A first protrusion that protrudes beyond the recess and whose radial length decreases toward the driving direction;
A second convex portion that protrudes in the radial direction from the concave portion and has a radial length that increases in the driving direction.The concave portion has a large diameter side of the first convex portion, and the second convex portion. 2. A nail that is connected to at least one of the two convex portions on the large diameter side. The recess has a recess connection surface;
When the concave portion is connected to at least one of the large-diameter side of the first convex portion and the large-diameter side of the second convex portion, the concave portion includes the first convex portion and the first convex portion. Continuous with at least one surface of the two convex portions,
2. The nail according to claim 1, wherein an angle formed by at least one surface of the first convex portion and the second convex portion and the concave connecting surface is 90 degrees or more.   The at least one of the first convex portion and the second convex portion is a truncated cone shape whose length in the radial direction changes toward the driving direction. Nails.   At least one of the first convex portion and the second convex portion has a length in the radial direction that changes with respect to a circumferential direction substantially centered on a virtual axis that passes through the approximate center of the concave portion and extends in the driving direction. The nail according to claim 1 or 2, characterized in that: The trunk portion has a plurality of the first convex portion, the second convex portion, and the concave portion, respectively.
The trunk portion has a plurality of sets in which the small diameter side of one first convex portion and the small diameter side of one second convex portion are connected,
The nail according to any one of claims 1 to 4, wherein the plurality of sets are arranged in the driving direction with the concave portion interposed therebetween. The trunk portion has a plurality of the first convex portion, the second convex portion, and the concave portion, respectively.
The body portion includes a first set in which a plurality of the first convex portions are arranged in the driving direction and a second set in which the plurality of the second convex portions are arranged in the driving direction. Lined in the driving direction across,
The concave portion is at least one of a side where the large diameter of the first convex portion is provided in the first set and a side where the large diameter of the second convex portion is provided in the second set. The nail according to any one of claims 1 to 4, wherein the nail is connected to the nail. A nail that defines a virtual axis that passes through the approximate center of the trunk and extends in the driving direction,
The first convex portion is
A first frustoconical portion whose length in the radial direction decreases toward the driving direction;
A first deforming convex portion whose length in the radial direction changes with respect to a circumferential direction centered on the virtual axis, while the length in the radial direction decreases toward the driving direction;
The second convex portion is
A second frustoconical portion whose length in the radial direction decreases toward the driving direction;
3. The first deformable convex portion having a length in the radial direction that decreases in the driving direction and a length in the radial direction that changes with respect to the circumferential direction. Nail as described in. The trunk includes a plurality of the first convex portions,
The nail according to any one of claims 1 to 7, wherein lengths of the large diameters of the plurality of first protrusions are different from each other. The trunk includes a plurality of the second convex portions,
The nail according to any one of claims 1 to 7, wherein lengths of the large diameters of the plurality of second convex portions are different from each other.

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