Screws

Abstract

To provide a screw nail capable of suppressing inclination at the time of striking, while suppressing influence of deformation due to striking.SOLUTION: A screw nail 1A comprises a nail shaft part 2 extending along one direction, and a head part 3 whose diameter is expanded along another direction orthogonal to the extension direction of the nail shaft part 2. A projection part 32 projecting along an axial direction of the nail shaft part 2 is formed on an end surface 30 of the head part 3 opposite to a side where the nail shaft part 2 projects. A recess part 33 is formed between the projection part 32 and an engagement part 31 that can be engaged with a rotary tool, and is concave with respect to the projection part 32 along the axial direction of the nail shaft part 2. A virtual plane contacting a vertex of the projection part 32 is perpendicular to the axial direction of the nail shaft part 2.SELECTED DRAWING: Figure 1A

Description

Technical Field

[0001] The present invention relates to a screw nail used for fastening steel plates and the like.

Background Art

[0002] For fastening steel plates used in roof construction and the like, "screws" that can be tightened and removed are often used. However, screw construction has a problem in that it is necessary to drill a pilot hole and screw it in while cutting a tap, resulting in poor workability.

[0003] As a solution to such problems, there has been proposed a screw nail that can be driven in using a tool operated by a motor, pneumatic pressure, combustion pressure of gas, etc. during driving, and can be removed by rotating it like a "screw" when removing.

[0004] When using a screw nail for fastening a steel plate, since high torque transmission is essential, a screw nail having a "square hole or hexagonal hole recess" or a "hexagonal head" that is excellent in torque transmission rather than a "cross groove recess" is used.

[0005] Recesses of "square holes" and "hexagonal holes" suitable for high torque transmission are characterized by having a smaller clearance between the bit and the recess compared to the recess of the "cross groove". However, in the case of a screw nail, the recess may be deformed by the impact during driving, resulting in a problem that the bit does not fit into the recess.

[0006] Therefore, a technique has been proposed in which an annular protrusion serving as a countersink is formed on the outer periphery of the head of the screw nail (see, for example, Patent Document 1). In addition, a screw having a protrusion formed on the upper surface of the head has been proposed for the purpose of aligning the direction of the recess (see, for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

[0008] However, in configurations where annular projections are provided on the outer circumference of the head, the projections can be crushed and spread outwards during impact, increasing the head diameter and resulting in an unsightly appearance. Furthermore, if the crushed projections protrude outwards from the outer circumference of the head in a burr-like manner, they may come into contact with surrounding materials and cause damage. Moreover, with screws having a "hexagonal head," if the head diameter becomes too large, the socket may not fit, making it impossible to loosen the screw. In addition, when using screws with one or two projections on the top surface of the head as screw nails, if the screw nail and the driver's shaft are misaligned, the driver's striking surface will only strike a portion of the screw nail's head, preventing the impact force from being transmitted axially, which can cause the screw nail to tilt.

[0009] This invention was made to solve these problems, and aims to provide a screw nail that suppresses the effects of deformation caused by impact while also suppressing tilting during impact. [Means for solving the problem]

[0010] To solve the above-mentioned problems, the present invention provides a screw nail comprising a nail shaft portion extending in one direction and a head that is enlarged in another direction perpendicular to the extension direction of the nail shaft portion, wherein a sharp tip portion is formed on one end of the nail shaft portion along the extension direction, and a head portion is formed on the other end, a screw thread is formed on the nail shaft portion between the tip portion and the head, and an engaging portion for engaging with a rotary tool is formed on the head, wherein the engaging portion is composed of a hole with an opening having at least three vertices exposed on the end face of the head opposite to the side from which the nail shaft portion protrudes, a convex portion is formed on the end face that protrudes along the axial direction of the nail shaft portion, recesses are formed on the inside of the convex portion with respect to the radial direction of the head, between the convex portion and the engaging portion, and on the outside of the convex portion with respect to the radial direction of the head, between the outer circumference of the head and the convex portion, and recesses are formed on the same plane as the end face and are part of the end face, and the convex portion It extends circumferentially around the head, beyond the half-region divided by an arbitrary center line, and is tangent to the vertex of the convex portion that extends beyond the half-region of the end face. The virtual plane is a screw nail that is perpendicular to the axial direction of the nail shaft. Furthermore, the present invention relates to a screw nail comprising a nail shaft portion extending in one direction and a head portion that is enlarged in another direction perpendicular to the extension direction of the nail shaft portion, wherein a sharp tip portion is formed on one end of the nail shaft portion along the extension direction, and a head portion is formed on the other end, a screw thread is formed on the nail shaft portion between the tip portion and the head, and an engaging portion that can engage with a rotary tool is formed on the head, wherein the engaging portion is formed as a polygon on the outer circumference of the head, a convex portion is formed on the end face of the head opposite to the side on which the nail shaft portion protrudes, a convex portion protruding along the axial direction of the nail shaft portion is formed, a recess is formed between the convex portion and the engaging portion on the outside of the convex portion with respect to the radial direction of the head, the recess is formed on the same plane as the end face and is part of the end face, and the virtual plane identified by the vertex of the convex portion is a plane perpendicular to the axial direction of the nail shaft portion.

[0011] In this invention, the protrusion struck by the striking tool has a recess formed between it and the engaging portion. This eliminates factors that would hinder the engagement between the rotating tool that rotates the screw and the engaging portion of the screw, even if the protrusion deforms due to the impact. Furthermore, the virtual plane identified by the apex of the protrusion is perpendicular to the axial direction of the nail shaft, thereby transmitting the impact force in the axial direction of the screw. [Effects of the Invention]

[0012] According to the present invention, it is possible to suppress the influence of deformation caused by hitting the convex portion formed on the head of the screw nail and maintain a state in which engagement between the rotary tool for rotating the screw nail and the engaging portion of the screw nail can be performed. Further, it is possible to suppress the inclination of the screw nail during hitting.

Brief Description of the Drawings

[0013] [Figure 1A] It is a perspective view showing an example of a screw nail of the first embodiment. [Figure 1B] It is a plan view showing an example of a screw nail of the first embodiment. [Figure 1C] It is a cross-sectional view taken along the line X-X of FIG. 1B. [Figure 1D] It is a side view showing an example of a screw nail of the first embodiment. [Figure 2A] It is an explanatory view showing the relationship between a driver for hitting a screw nail and the screw nail. [Figure 2B] It is an explanatory view showing the relationship between a driver for hitting a screw nail and the screw nail. [Figure 2C] It is an explanatory view showing the relationship between a driver for hitting a screw nail and the screw nail. [Figure 2D] [[ID=(此处疑似重复编号31的内容,按照要求保留原文)]] [Figure 2D] [Figure 2E] It is an explanatory view showing the relationship between a driver for hitting a screw nail and the screw nail. [Figure 3A] It is a perspective view showing an example of a screw nail of the second embodiment. [Figure 3B] It is a plan view showing an example of a screw nail of the second embodiment. [Figure 3C] It is a cross-sectional view taken along the line X-X of FIG. 3B. [Figure 3D] It is a side view showing an example of a screw nail of the second embodiment. [[ID=(此处疑似重复编号48的内容,按照要求保留原文)]] [Figure 4A] It is a perspective view showing an example of a screw nail of the third embodiment. [Figure 4B] It is a plan view showing an example of a screw nail of the third embodiment. [Figure 4C] It is a cross-sectional view taken along the line X-X of FIG. 4B. [Figure 4D] It is a side view showing an example of a screw nail of the third embodiment. [Figure 5A] It is a perspective view showing an example of a screw nail of the fourth embodiment. [Figure 5B] It is a plan view showing an example of a screw nail of the fourth embodiment. [Figure 5C] It is a cross-sectional view taken along the line X-X of FIG. 5B. [Figure 5D] It is a side view showing an example of a screw nail of the fourth embodiment. [Figure 6A] It is a perspective view showing an example of a screw nail of the fifth embodiment. [Figure 6B] It is a plan view showing an example of a screw nail of the fifth embodiment. [Figure 6C] It is a cross-sectional view taken along the line X-X of FIG. 6B. [Figure 6D] It is a side view showing an example of a screw nail of the fifth embodiment. [Figure 7A] It is a perspective view showing an example of a screw nail of the sixth embodiment. [Figure 7B] It is a plan view showing an example of a screw nail of the sixth embodiment. [Figure 7C] It is a cross-sectional view taken along the line X-X of FIG. 7B. [Figure 7D] It is a side view showing an example of a screw nail of the sixth embodiment. [Figure 8A] It is a perspective view showing an example of a screw nail of the seventh embodiment. [Figure 8B] It is a plan view showing an example of a screw nail of the seventh embodiment. [Figure 8C] It is a cross-sectional view taken along the line X-X of FIG. 8B. [Figure 8D] It is a side view showing an example of a screw nail of the seventh embodiment. [Figure 9A] It is a perspective view showing an example of a screw nail of the eighth embodiment. [Figure 9B] It is a plan view showing an example of a screw nail of the eighth embodiment. [Figure 9C] It is a cross-sectional view taken along the line X-X of FIG. 9B. [Figure 9D]This is a side view showing an example of a screw nail according to the eighth embodiment. [Figure 10A] This is a perspective view showing an example of a screw nail according to the ninth embodiment. [Figure 10B] This is a plan view showing an example of a screw nail according to the ninth embodiment. [Figure 10C] Figure 10B is a cross-sectional view along line XX. [Figure 10D] This is a side view showing an example of a screw nail according to the ninth embodiment. [Figure 11A] This is a perspective view showing an example of a screw nail according to the tenth embodiment. [Figure 11B] This is a plan view showing an example of a screw nail according to the tenth embodiment. [Figure 11C] Figure 11B is a cross-sectional view along line XX. [Figure 11D] This is a side view showing an example of a screw nail according to the tenth embodiment. [Modes for carrying out the invention]

[0014] Hereinafter, embodiments of the screw nail of the present invention will be described with reference to the drawings.

[0015] <Example of screw nail configuration in this embodiment> Figure 1A is a perspective view showing an example of a screw nail according to the first embodiment, Figure 1B is a plan view showing an example of a screw nail according to the first embodiment, Figure 1C is a cross-sectional view of line XX in Figure 1B, and Figure 1D is a side view showing an example of a screw nail according to the first embodiment.

[0016] The screw nail 1A comprises a nail shaft portion 2 extending in one direction indicated by arrows A1 and A2, and a head portion 3 that is enlarged in the other direction indicated by arrows B1 and B2, which are perpendicular to the direction of extension of the nail shaft portion 2.

[0017] The screw nail 1A has a tip portion 20 formed on one end indicated by arrow A1 along the extension direction of the nail shaft portion 2. The tip portion 20 is formed in a sharp shape so that the end on one end of the nail shaft portion 2 can be driven into the object to be fastened.

[0018] Furthermore, the screw nail 1A has a head 3 formed at the other end indicated by arrow A2 along the extension direction of the nail shaft 2. In addition, the screw nail 1A has threads 21 formed on the nail shaft 2 between the tip 20 and the head 3, along the extension direction of the nail shaft 2.

[0019] The screw nail 1A has an engagement portion 31 formed on the end face 30 of the head 3 opposite to the side from which the nail shaft portion 2 protrudes, which can engage with a rotary tool (not shown). The engagement portion 31 is made up of a predetermined shape hole in the end face 30 of the head 3, with an opening having at least three vertices exposed. If the bit (not shown), which is a rotary tool, has a square cross-sectional shape, the engagement portion 31 is made up of a square hole with an exposed opening in the end face 30. The engagement portion 31 formed by providing a predetermined shape hole in the end face 30 of the head 3 to match the rotary tool is called a recess.

[0020] The screw nail 1A has a projection 32 on the end face 30 of the head 3 that protrudes in the opposite direction to the direction in which the nail shaft 2 protrudes from the head 3, along the axial direction of the nail shaft 2. The screw nail 1A has at least three projections 32 formed on the end face 30 of the head 3. The three or more projections 32 are formed at equal intervals along the circumferential direction of the head 3 on concentric circles centered on the axis of rotation O of the screw nail 1A.

[0021] As a result, at the end face 30 of the head 3, at least one protrusion 32 is located in one half of the region divided by an arbitrary center line, and the remaining protrusion 32 is located in the other half of the region. Thus, at the end face 30 of the head 3, the protrusion 32 is in contact with the striking tool that strikes the head of the screw nail 1A in each half of the region divided by an arbitrary center line.

[0022] Therefore, when the striking tool strikes the head 3 of the screw nail 1A, the striking tool strikes each protrusion 32, thereby transmitting the striking force in the axial direction of the screw nail 1A.

[0023] In the examples shown in Figures 1A, 1B, 1C, and 1D, the screw nail 1A has four protrusions 32 formed on the end face 30 of the head 3. The four protrusions 32 are formed at equal intervals along the circumferential direction of the head 3 on concentric circles centered on the axis of rotation O of the screw nail 1A.

[0024] In the screw nail 1A, recesses 33 are formed on the outside of each protrusion 32 in the radial direction of the head 3 along the direction indicated by arrows B1 and B2 perpendicular to the extension direction of the nail shaft 2, and are concave relative to the protrusion 32 along the axial direction of the nail shaft 2. In addition, recesses 34 are formed on the inside of each protrusion 32, and are concave relative to the protrusion 32 along the axial direction of the nail shaft 2. In the configuration in which the screw nail 1A has an engaging portion 31 formed by drilling a hole in the end face 30 of the head 3, the recesses 33 and 34 are formed on the same plane connected to the end face 30 and are part of the end face 30. Also, in the configuration in which the screw nail 1A has an engaging portion 31 formed by drilling a hole in the end face 30 of the head 3, the recesses 34 are formed between the protrusion 32 and the engaging portion 31.

[0025] As shown in Figure 1B, etc., if the engaging portion 31 is a hole formed in the end face 30 of the head portion 3, and the opening exposed on the end face 30 is square, the four protrusions 32 are provided at positions opposite each side 31a of the square.

[0026] As a result, compared to a configuration in which the four protrusions 32 are positioned opposite the vertices 31b of the square, it is possible to position each protrusion 32 on the circumscribed circle C1 passing through each vertex 31b of the engaging portion 31 while ensuring the dimensions of the recess 34 between the engaging portion 31 and the protrusions 32, and to position the protrusions 32 closer to the radial center of the head 3. In addition, it is possible to ensure the dimensions of the recess 33 between the outer circumference of the head 3 and the protrusions 32.

[0027] Therefore, even if the protrusion 32 formed on the head 3 of the screw nail 1A is deformed by being struck with a striking tool, the recess 34 formed between the protrusion 32 and the engaging portion 31 prevents deformation of the engaging portion 31, and maintains a state in which the rotary tool (bit) that rotates the screw nail 1A and the engaging portion 31 of the screw nail 1A can engage.

[0028] Furthermore, if the engaging portion 31 is a hole formed in the end face 30 of the head portion 3, and the opening exposed on the end face 30 is square, the four protrusions 32 may be positioned opposite each vertex 31b of the square. In this case, each protrusion 32 is positioned outside the circumscribed circle C1 passing through each vertex 31b of the engaging portion 31.

[0029] Figures 2A, 2B, 2C, 2D, and 2E are explanatory diagrams showing the relationship between a screwdriver used to strike a screw and the screw itself. As a striking tool for striking the end face 30 of the head 3, a tool is known that operates a driver 100, as shown in Figure 2A, which strikes the end face 30 of the head 3 of the screw 1A, using a motor, air pressure, gas combustion pressure, etc. In such a tool, the driver 100 passes through the passage through which the screw 1A is driven out, so the diameter of the driver 100 is approximately equal to or less than the diameter of the head 3, and the diameter of the striking surface 101 of the driver 100 is smaller than the diameter of the end face 30 of the head 3.

[0030] As shown in Figure 2B, for a tool using a screw nail 1A with a head diameter D1 of approximately 8.5 mm at the end face 30 of the head 3, the diameter D2 of the striking surface 101 of the driver 100 is approximately 7 mm, as shown in Figure 2C. Therefore, when the area of ​​the end face 30 of the head 3 is set to 100%, the area of ​​the striking surface of the driver 100 is approximately 68%.

[0031] Furthermore, as shown in Figure 2D, within the tool passage (not shown) through which the screw nail 1A and the driver 100 pass, the relative amount of movement L between the screw nail 1A and the driver 100 along the radial direction of the head 3 is approximately 1 mm.

[0032] As a result, as shown in Figure 2E, when the screw nail 1A and the driver 100 move relatively by the maximum possible amount L along the radial direction of the head 3, the overlapping area S between the end face 30 of the head 3 and the striking surface 101 of the driver 100 is approximately 66%.

[0033] In order to form recesses 33 on the outside of each protrusion 32 in the radial direction of the head 3, if the area of ​​the end face 30 of the head 3 is set to 100 (%), then if the area of ​​the protrusions 32 is within 64% or less of the area of ​​the end face 30, and there are three or more protrusions 32 located on the outside of the engaging portion 31, then each protrusion 32 will be in contact with the striking surface 101 of the driver 100.

[0034] As a result, as shown in Figure 2D, even if the screw nail 1A and the driver 100 move relative to each other by the maximum possible amount L along the radial direction of the head 3, the driver 100 can strike the head 3 of the screw nail 1A, thereby transmitting the striking force in the axial direction of the screw nail 1A by striking each protrusion 32.

[0035] In the case of a screw nail 1A with a head diameter D1 of approximately 8.5 mm at the end face 30 of the head 3, the diameter of the circumscribed circle C1 passing through each vertex 31b of the engaging portion 31 is approximately 4.2 mm. Therefore, if the diameter D2 of the striking surface 101 of the driver 100 is approximately 7 mm, the convex portion 32 is formed within a circle with a diameter of 4.2 mm to 7 mm from the center of the head 3, so that each convex portion 32 and the striking surface 101 of the driver 100 come into contact.

[0036] Furthermore, if the striking tool used to strike the end face 30 of the head 3 is a hammer used to strike the screw nail 1A with hand force, the diameter of the hammer's striking surface is generally larger than the diameter of the head 3. As a result, when striking the head 3 of the screw nail 1A with the hammer, each protrusion 32 comes into contact with the hammer's striking surface.

[0037] Furthermore, in the case of a tool that operates a driver 100 that strikes the end face 30 of the head 3 using a motor, air pressure, gas combustion pressure, etc., the force with which the driver 100 strikes the protrusion 32 of the head 3 is approximately 1500N to 3000N. Therefore, the protrusion height of the protrusion 32 from the end face 30 was set to 0.5mm to 1.5mm. It should be noted that if a hammer with a striking part weighing approximately 400g is used, a striking force of approximately 500N is expected to be generated.

[0038] As a result, by setting the protrusion height of the protrusion portion 32 from the end face 30 to 0.5 mm or more and 1.5 mm or less, the striking tool does not directly strike the end face 30 of the head 3, and deformation of the engagement portion 31 and the outer shape of the head 3 is suppressed. In addition, since the protrusion portion 32 is positioned a predetermined amount inward from the outer peripheral edge of the head 3, even if the protrusion portion 32 is crushed and deformed, the crushed protrusion portion 32 is suppressed from protruding outward from the outer peripheral edge of the head 3 in a burr-like manner. Therefore, the occurrence of cosmetic defects such as the crushed protrusion portion 32 protruding outward from the outer peripheral edge of the head 3 is suppressed, and the crushed protrusion portion 32 that has protruded in a burr-like manner is suppressed from affecting surrounding members, etc.

[0039] Furthermore, the height of each protrusion 32 from the end face 30 of the screw nail 1A is set such that a virtual plane H1, which is a virtual plane identified by the vertices of the protrusions 32 and is tangent to the vertices of three or more protrusions 32, is perpendicular to the axis O of the screw nail 1A. This allows the impact force to be transmitted in the axial direction of the screw nail 1A by the impact tool striking each protrusion 32 when the impact tool strikes the head 3 of the screw nail 1A.

[0040] <Modified example of the screw nail according to this embodiment> Figure 3A is a perspective view showing an example of a screw nail according to the second embodiment, Figure 3B is a plan view showing an example of a screw nail according to the second embodiment, Figure 3C is a cross-sectional view of line XX in Figure 3B, and Figure 3D is a side view showing an example of a screw nail according to the second embodiment.

[0041] The screw nail 1B has three protrusions 32 formed on the end face 30 of the head 3. The three protrusions 32 are formed at equal intervals along the circumferential direction of the head 3, on concentric circles centered on the axis of rotation O of the screw nail 1B. Note that the number of protrusions 32 may be four or more.

[0042] Figure 4A is a perspective view showing an example of a screw nail according to the third embodiment, Figure 4B is a plan view showing an example of a screw nail according to the third embodiment, Figure 4C is a cross-sectional view of line XX in Figure 4B, and Figure 4D is a side view showing an example of a screw nail according to the third embodiment.

[0043] The screw nail 1C has a projection 32 that protrudes from the end face 30 of the head 3, and the projection 32 is formed continuously in the circumferential direction of the head 3, extending beyond half of the area divided by an arbitrary center line on the end face 30 of the head 3. The projection 32 can be a continuous ring shape, or a C-shape with a portion cut out, as long as the virtual plane tangent to the vertices of the projection 32 that extends beyond half of the area of ​​the end face 30 is perpendicular to the axial direction of the nail shaft 2, as defined by the vertices of the projection 32.

[0044] If the engaging portion 31 is a hole formed in the end face 30 of the head 3, the opening exposed on the end face 30 may be a polygon such as a hexagon, not just a square, or a star shape, where the spaces between the vertices are concave towards the center. The convex portion 32 may be formed at a position opposite to the vertices of the polygon or star shape, at a position opposite to the sides between the vertices of the polygon, or at a position corresponding to the concave portion between the vertices.

[0045] Figure 5A is a perspective view showing an example of a screw nail according to the fourth embodiment, Figure 5B is a plan view showing an example of a screw nail according to the fourth embodiment, Figure 5C is a cross-sectional view along line XX of Figure 5B, and Figure 5D is a side view showing an example of a screw nail according to the fourth embodiment.

[0046] Furthermore, Figure 6A is a perspective view showing an example of a screw nail according to the fifth embodiment, Figure 6B is a plan view showing an example of a screw nail according to the fifth embodiment, Figure 6C is a cross-sectional view of line XX in Figure 6B, and Figure 6D is a side view showing an example of a screw nail according to the fifth embodiment.

[0047] The screw nails 1D and 1E have an engagement portion 35 formed on the outer circumference of the head 3, which is polygonal and can engage with a rotary tool (not shown). In this example, the engagement portion 35 is hexagonal. The head 3 may also have a flange portion, such as a circle, formed between the engagement portion 35 and the nail shaft portion 2, which is radially enlarged relative to the engagement portion 35.

[0048] Screw nails 1D and 1E are provided with protrusions 32 on the end face 30 of the head 3, projecting in the direction opposite to the direction in which the nail shaft 2 protrudes from the head 3, along the axial direction of the nail shaft 2. In screw nail 1D, six protrusions 32 are formed on the end face 30 of the head 3 at positions opposite to the sides between each vertex of the polygonal engaging portion 35. In addition, recesses 33 are formed on the outside of each protrusion 32 in the radial direction of the head 3 of screw nail 1D. In screw nail 1E, six protrusions 32 are formed on the end face 30 of the head 3 at positions opposite to each vertex of the polygonal engaging portion 35. In addition, recesses 33 are formed on the outside of each protrusion 32 in the radial direction of the head 3 of screw nail 1E. In this configuration, where the outer circumference of the head 3 is polygonal and the engaging portion 35 is formed, recesses 33 are formed between the protrusions 32 and the engaging portion 35.

[0049] Therefore, even if the protrusion 32 formed on the head 3 of the screw nails 1D and 1E is deformed by being struck with a striking tool, the recess 33 formed between the protrusion 32 and the engaging portion 35 suppresses deformation of the engaging portion 35, and maintains the state in which the rotating tool (socket) that rotates the screw nails 1D and 1E can engage with the engaging portion 35 of the screw nails 1D and 1E.

[0050] Figure 7A is a perspective view showing an example of a screw nail according to the sixth embodiment, Figure 7B is a plan view showing an example of a screw nail according to the sixth embodiment, Figure 7C is a cross-sectional view along line XX of Figure 7B, and Figure 7D is a side view showing an example of a screw nail according to the sixth embodiment.

[0051] In the screw nail 1F, three protrusions 32 are formed on the end face 30 of the head 3, at positions opposite to three vertices located on an equilateral triangle within the vertices of the hexagonal engaging portion 35, and recesses 33 are formed between each protrusion 32 and the engaging portion 35. In this way, in a screw nail in which the outer circumference of the head 3 is formed as a polygon and the engaging portion 35 is formed, the protrusions 32 may be formed at positions opposite to a desired side within the sides between each vertex of the polygonal engaging portion 35, and at positions opposite to a desired vertex within each vertex of the polygonal engaging portion 35.

[0052] Figure 8A is a perspective view showing an example of a screw nail according to the seventh embodiment, Figure 8B is a plan view showing an example of a screw nail according to the seventh embodiment, Figure 8C is a cross-sectional view of line XX in Figure 8B, and Figure 8D is a side view showing an example of a screw nail according to the seventh embodiment.

[0053] The screw nail 1G has an engagement portion 35 formed by a polygon on the outer circumference of the head 3, and a protrusion 32 that projects from the end face 30 of the head 3 is formed continuously in the circumferential direction of the head 3. In addition, the screw nail 1G has a recess 33 formed between the protrusion 32 and the engagement portion 35. The protrusion 32 may be in an annular continuous shape, or it may be a C-shape, for example, with a part of it cut out.

[0054] Figure 9A is a perspective view showing an example of a screw nail according to the eighth embodiment, Figure 9B is a plan view showing an example of a screw nail according to the eighth embodiment, Figure 9C is a cross-sectional view of line XX in Figure 9B, and Figure 9D is a side view showing an example of a screw nail according to the eighth embodiment.

[0055] The screw nail 1H has an engagement portion 35 formed by a polygon on the outer circumference of the head 3, and two protrusions 32 on the end face 30 of the head 3 that protrude in the opposite direction to the direction in which the nail shaft portion 2 protrudes from the head 3, along the axial direction of the nail shaft portion 2. In addition, the screw nail 1H has a recess 33 formed between the protrusions 32 and the engagement portion 35. The protrusions 32 have a shape that extends along the end face 30 of the head 3, and the protrusions 32 are located on both the one and the other half of the region divided by an arbitrary center line on the end face 30 of the head 3, and the striking surface 101 of the driver 100 shown in Figure 2A etc. and the protrusions 32 are in linear contact, and the virtual plane identified by the vertices of the protrusions 32 is in contact with the vertices of the protrusions 32 located on both the one and the other half of the region on the end face 30, and the virtual plane is perpendicular to the axial direction of the nail shaft portion 2.

[0056] Figure 10A is a perspective view showing an example of a screw nail according to the ninth embodiment, Figure 10B is a plan view showing an example of a screw nail according to the ninth embodiment, Figure 10C is a cross-sectional view of line XX in Figure 10B, and Figure 10D is a side view showing an example of a screw nail according to the ninth embodiment.

[0057] The screw nail 1I has an engagement portion 35 formed by a polygon on the outer circumference of the head 3, and a projection 32 on the end face 30 of the head 3 that protrudes in the opposite direction to the direction in which the nail shaft portion 2 protrudes from the head 3, along the axial direction of the nail shaft portion 2. The projection 32 is formed in a cross shape when viewed from the axial direction on the end face 30 of the head 3. In addition, the screw nail 1I has a recess 33 formed between the projection 32 and the engagement portion 35. The center of the cross may also have a recess formed therein.

[0058] Figure 11A is a perspective view showing an example of a screw nail according to the 10th embodiment, Figure 11B is a plan view showing an example of a screw nail according to the 10th embodiment, Figure 11C is a cross-sectional view along line XX of Figure 11B, and Figure 11D is a side view showing an example of a screw nail according to the 10th embodiment.

[0059] The screw nail 1J has an engagement portion 35 formed by a polygon on the outer circumference of the head 3, and a protrusion 32 on the end face 30 of the head 3 that protrudes in the opposite direction to the direction in which the nail shaft portion 2 protrudes from the head 3, along the axial direction of the nail shaft portion 2. The protrusion 32 is formed in the shape of any alphabet when viewed from the axial direction on the end face 30 of the head 3. In addition, the screw nail 1J has a recess 33 formed between the protrusion 32 and the engagement portion 35. Note that the alphabet may have a shape in which a part is cut out. It may also be a letter other than an alphabet or a number.

[0060] Thus, if the end face 30 of the head 3 is configured such that a part of the protrusion 32 is located in one half of the region divided by an arbitrary center line, and the other part of the protrusion 32 is located in the other half of the region, then the protrusion 32 will come into contact with the striking tool that strikes the head of the screw nail in each half of the region divided by the arbitrary center line on the end face 30 of the head 3.

[0061] Furthermore, by setting the height of the protrusion 32 such that the virtual plane tangent to the vertex of the protrusion 32, which is identified by the vertex of the protrusion 32, is perpendicular to the axis of the screw, the impact force can be transmitted in the axial direction of the screw when the impact tool strikes the protrusion 32 during the action of striking the head of the screw. [Explanation of symbols]

[0062] 1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H, 1I, 1J... Screw nail, 2... Nail shaft, 20... Tip, 21... Thread, 3... Head, 30... End face, 31... Engaging part, 32... Protrusion, 33, 34... Recess, 35... Engaging part

Claims

1. A nail shaft portion extending in one direction, The nail has a head that is widened in a direction perpendicular to the extension direction of the nail shaft, A sharp tip is formed on one end of the nail shaft along the extension direction, and the head is formed on the other end. In a screw nail in which a screw thread is formed on the nail shaft between the tip and the head, and an engaging portion that can engage with a rotary tool is formed on the head, The engaging portion is composed of a hole in the head, on the end face opposite to the side from which the nail shaft protrudes, in which an opening having at least three vertices is exposed. A protrusion is formed on the end face that extends along the axial direction of the nail shaft portion. With respect to the radial direction of the head, recesses are formed on the inside of the protrusion between the protrusion and the engaging portion, and on the outside of the protrusion with respect to the radial direction of the head, between the outer circumference of the head and the protrusion, which are concave relative to the protrusion along the axial direction of the nail shaft portion. The recess is formed on the same plane as the end face and is a part of the end face. The convex portion extends in the circumferential direction of the head to an area beyond half of the area divided by an arbitrary center line on the end face of the head, and the virtual plane tangent to the vertex of the convex portion extending beyond half of the area of ​​the end face is a plane perpendicular to the axial direction of the nail shaft portion. Screws.

2. A nail shaft portion extending in one direction, The nail has a head that is widened in a direction perpendicular to the extension direction of the nail shaft, A sharp tip is formed on one end of the nail shaft along the extension direction, and the head is formed on the other end. In a screw nail in which a screw thread is formed on the nail shaft between the tip and the head, and an engaging portion that can engage with a rotary tool is formed on the head, The engaging portion is formed with a polygonal outer circumference of the head, On the head portion, a protrusion is formed on the end face opposite to the side from which the nail shaft portion protrudes, which protrudes along the axial direction of the nail shaft portion. A recess is formed between the protrusion and the engaging portion on the outer side of the protrusion with respect to the radial direction of the head. The recess is formed on the same plane as the end face and is a part of the end face. The virtual plane identified by the vertex of the convex portion is a plane perpendicular to the axial direction of the nail shaft portion. Screws.

3. The end face of the head has protrusions located in both one and the other half of a region divided by an arbitrary center line, and the protrusions located in one or both half of the end face extend along the end face of the head, and a virtual plane tangent to the vertices of the protrusions located in both half of the end face is perpendicular to the axial direction of the nail shaft. The screw nail according to claim 2.

4. The protrusion extends in the circumferential direction of the head to an area beyond half of the area divided by an arbitrary center line on the end face of the head, and a virtual plane tangent to the vertex of the protrusion that extends beyond half of the area of ​​the end face is perpendicular to the axial direction of the nail shaft. The screw nail according to claim 2.

5. The protrusion has a projection height of 0.5 mm or more and 1.5 mm or less from the end face. A screw nail according to any one of claims 1 to 4.

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