JP7107618B1 - Headed screw and its manufacturing method - Google Patents

Abstract

A head screw having improved strength while suppressing an increase in mass is provided. A headed screw is a headed screw in which a male thread is formed on a shank extending from a head. This headed screw has a resin molded portion and a reinforcing shaft. The resin molded portion is made of a synthetic resin material and integrally forms the head portion and the shaft portion. The reinforcing shaft is embedded in the resin molded portion from the head portion to the shaft portion, and has a rod shape having an axis on the axis of the shaft portion. The reinforcing shaft has an outer peripheral surface on which unevenness is formed, and a shaft hole that is open along the axis of the shaft and at least one end of the head and the shaft. [Selection drawing] Fig. 1

Description

This specification discloses a technology related to a head screw and a manufacturing method thereof.

A headed screw, also called a bolt, is a screw in which a male thread is formed on a shank extending from a head. Headed screws are known to be made of metal as well as synthetic resin (plastic). Patent Literature 1 describes a headed screw in which a thermoplastic material containing glass powder is laminated on the outer periphery of a core made of plastic. US Pat. No. 6,200,000 describes a plastic headed screw embedded with radially oriented fibrous reinforcement.

JP-A-61-197809 JP-A-7-217629

Headed screws made of synthetic resin are lighter than those made of metal, but are inferior in strength.

The technology disclosed in this specification can be implemented as the following modes.

(1) A headed screw in one form disclosed in this specification is a headed screw in which a male thread is formed on a shaft portion extending from a head portion. This headed screw has a resin molded portion and a reinforcing shaft. The resin molded portion is made of a synthetic resin material and integrally forms the head portion and the shaft portion. The reinforcing shaft is embedded in the resin molded portion from the head portion to the shaft portion, and has a rod shape having an axis on the axis of the shaft portion. The reinforcing shaft has an outer peripheral surface formed with unevenness, and a shaft hole that is opened along the axis of the shaft portion and at least one end of the head portion and the shaft portion. According to this type of headed screw, the reinforcement shaft can improve the strength from the head portion to the shaft portion, and the unevenness of the outer peripheral surface of the reinforcement shaft that bites into the resin molded portion prevents the separation of the resin molded portion and the reinforcement shaft. In addition, the shaft hole can suppress an increase in mass due to the reinforcing shaft. Also, by inserting a corresponding pin into the shaft hole and rotating the pin together with the headed screw around the axis and observing the presence or absence of swing due to eccentricity, it is possible to easily inspect the presence or absence of misalignment of the reinforcing shaft.

(2) In the above-described headed screw, the reinforcing shaft further includes a female thread formed on the inner peripheral surface of the shaft hole and having a reverse thread relationship with the male thread of the shaft portion. may have. According to this type of headed screw, even if the shaft part is broken and separated from the head part and remains on the female screw to which it is attached, the female thread of the reinforcing shaft remaining on the shaft part By tightening a bolt corresponding to , the shaft part left behind at the mounting destination can be removed.

(3) A method of manufacturing a headed screw according to one aspect disclosed in this specification is a method of manufacturing a headed screw in which a male thread is formed on a shaft portion extending from a head portion. This manufacturing method includes the step of preparing a rod-shaped reinforcing shaft having an outer peripheral surface on which unevenness is formed and a shaft hole opened to at least one end along an axis; In a state where the positioning pin is inserted into the hole, the portion where the axis of the reinforcing shaft corresponds to the shaft portion from the portion corresponding to the head portion of the mold for the headed screw to the portion corresponding to the shaft portion. a step of positioning the reinforcing shaft at a position overlapping with the axis of the reinforcing shaft; and injecting a synthetic resin material into the mold in which the reinforcing shaft is positioned, thereby forming a resin molded portion constituting the head portion and the shaft portion. and integrally molding around said stiffening shaft. According to the manufacturing method of the headed screw in this embodiment, since the reinforcing shaft is positioned in the mold with the positioning pin inserted, the reinforcing shaft prevents misalignment of the reinforcing shaft with respect to the resin molded portion, and the reinforcing shaft prevents the head from being removed from the head. Headed screws can be manufactured with increased strength along the shank.

The technology disclosed herein can be implemented in a variety of forms other than head screws and methods of manufacturing same. The technology disclosed in this specification can be implemented in the form of, for example, a device having a head screw, a head screw manufacturing apparatus, and the like.

It is an explanatory view showing a bolt of a 1st embodiment. It is explanatory drawing which shows a mode that a bolt is manufactured. It is an explanatory view showing a bolt of a 2nd embodiment. It is explanatory drawing which shows the bolt of 3rd Embodiment. It is explanatory drawing which shows the bolt of 4th Embodiment. It is explanatory drawing which shows the bolt of 5th Embodiment.

A. First Embodiment FIG. 1 is an explanatory diagram showing a bolt 100 of a first embodiment. FIG. 1(a) is a top view showing the bolt 100. FIG. FIG. 1(b) is a front view showing the bolt 100. FIG. The XYZ axes in FIG. 1 are a coordinate system indicating the positional relationship of each part of the bolt 100 . Each axis in the XYZ axes of FIG. 1 is orthogonal to each other axis. The Z axis in FIG. 1 is an axis parallel to the axis AX1 of the shaft portion 130 of the bolt 100 . The +Z-axis direction is the direction from the shaft portion 130 of the bolt 100 toward the head portion 120 . The −Z-axis direction is the opposite direction of the +Z-axis direction.

The bolt 100 is a headed screw with a male thread 134 formed on a shank 130 extending from a head 120 . In this embodiment, bolt 100 is a hexagonal socket head bolt having a hexagonal tool hole 124 in head 120 . The bolt 100 can be used for fixing parts in various devices such as aircraft, aircraft, and electric appliances.

Bolt 100 includes resin molded portion 110 and reinforcing shaft 160 . The bolt 100 is a product in which a resin molded portion 110 is insert-molded around a reinforcing shaft 160 .

The resin molded portion 110 of the bolt 100 is made of a synthetic resin (plastic) material, and integrally forms the head portion 120 and the shaft portion 130 . The material of the resin molded portion 110 may be any synthetic resin material that has melting properties that allow injection molding and that has mechanical properties as a screw. For example, the material of the resin molded portion 110 may be thermoplastic polyimide (TPI) resin or polybenzimidazol (PBI) resin.

Reinforcing shaft 160 of bolt 100 has a rod shape having an axis on axis AX<b>1 of shaft portion 130 . The shape of the reinforcing shaft 160 is cylindrical in this embodiment, but may be cylindrical with a polygonal cross section in other embodiments. The reinforcing shaft 160 is embedded in the resin molded portion 110 from the head portion 120 to the shaft portion 130 . In this embodiment, the reinforcing shaft 160 is embedded in the resin molded portion 110 from the bottom of the tool hole 124 in the head portion 120 to the end portion 132 of the shaft portion 130 .

The material of the reinforcing shaft 160 may be any material that is superior to the synthetic resin material of the resin molded portion 110 in at least one of tensile strength, compressive strength and bending strength. The material of the reinforcing shaft 160 may be, for example, metal such as brass, iron, aluminum, or carbon fiber reinforced plastic.

Concavities and convexities are formed on the outer peripheral surface 164 of the reinforcing shaft 160 . In this embodiment, the outer peripheral surface 164 is formed with unevenness by knurling. In other embodiments, the unevenness of the outer peripheral surface 164 may be unevenness due to grooves perpendicular to the axis AX1, unevenness due to grooves along the axis AX1, or unevenness due to spiral grooves. It may be uneven. Further, the unevenness of the outer peripheral surface 164 may be unevenness due to a plurality of protrusions distributed in a dot pattern, or may be unevenness due to a plurality of holes distributed in a dot shape.

The reinforcement shaft 160 has a shaft hole 162 along the axis AX1. The shaft hole 162 is a through hole that penetrates the reinforcing shaft 160 . The shaft hole 162 opens to the end 122 of the head 120 through the tool hole 124 and opens to the end 132 of the shaft 130 .

FIG. 2 is an explanatory diagram showing how the bolt 100 is manufactured. When manufacturing the bolt 100 , the worker prepares the reinforcing shaft 160 . In the process of preparing the reinforcing shaft 160 , the worker forms the shaft hole 162 in the reinforcing shaft 160 and forms irregularities in the outer peripheral surface 164 of the reinforcing shaft 160 .

After preparing the reinforcing shaft 160 , the worker positions the reinforcing shaft 160 in the molds 810 , 820 of the bolt 100 while inserting the positioning pins 812 , 830 into the shaft holes 162 of the reinforcing shaft 160 . As a result, the reinforcing shaft 160 extends from the portion corresponding to the head portion 120 to the portion corresponding to the shaft portion 130 in the molds 810 and 820 so that the axial center AX1 of the portion corresponding to the shaft portion 130 positioned so as to overlap the

After positioning the reinforcing shaft 160, the operator injects a synthetic resin material into the molds 810 and 820 in which the reinforcing shaft 160 is positioned, thereby reinforcing the resin molded portion 110 forming the head portion 120 and the shaft portion 130. Integrally molded around axis 160 . After that, the operator removes the bolt 100 from the molds 810,820. This completes the bolt 100 .

According to the bolt 100 of the first embodiment described above, the reinforcement shaft 160 can improve the strength from the head portion 120 to the shaft portion 130 . In addition, the unevenness of the outer peripheral surface 164 of the reinforcing shaft 160 that bites into the resin molded portion 110 prevents separation of the resin molded portion 110 and the reinforcing shaft 160, and the shaft hole 162 can suppress an increase in mass due to the reinforcing shaft 160. . In addition, by inserting a corresponding pin into the shaft hole 162 and rotating the pin together with the bolt 100 around the axis AX1 and observing the presence or absence of swing due to eccentricity, the presence or absence of misalignment of the reinforcing shaft 160 can be easily inspected. can.

In addition, the space on the side of the end 122 of the head 120 and the space on the side of the end 132 of the shaft 130 can be communicated through the shaft hole 162 with the bolt 100 assembled. As a result, between the space on the side of the end 122 of the head 120 and the space on the side of the end 132 of the shaft 130, gases, liquids, fluids, powders, etc., are circulated, and strings, wires, etc. are arranged. can.

Further, when the reinforcing shaft 160 is a conductor, the end 122 side of the head portion 120 and the end 132 side of the shaft portion 130 can be energized via the reinforcing shaft 160 .

Further, according to the method of manufacturing the bolt 100 of the first embodiment, the reinforcing shaft 160 is positioned in the molds 810, 820 with the positioning pins 812, 830 inserted. Therefore, it is possible to manufacture the bolt 100 in which the strength is improved from the head portion 120 to the shaft portion 130 by the reinforcing shaft 160 while preventing misalignment of the reinforcing shaft 160 with respect to the resin molded portion 110 .

B. 2nd Embodiment FIG. 3 : is explanatory drawing which shows the bolt 200 of 2nd Embodiment. FIG. 2(a) is a top view showing the bolt 200. FIG. FIG. 2(b) is a front view showing the bolt 200. FIG. The XYZ axes in FIG. 3 are a coordinate system that indicates the positional relationship of each part of the bolt 200 . Each axis in the XYZ axes of FIG. 3 is orthogonal to each other axis. The Z axis in FIG. 3 is an axis parallel to the axis AX2 of the shaft portion 230 of the bolt 200 . The +Z-axis direction is the direction from the shaft portion 230 of the bolt 200 toward the head portion 220 . The −Z-axis direction is the opposite direction of the +Z-axis direction.

The bolt 200 is a headed screw with a male thread 234 formed on a shaft portion 230 extending from a head portion 220 . In this embodiment, bolt 200 is a hexagon socket head bolt having a hexagonal tool hole 224 in head 220 . The bolt 200 can be used for fixing parts of various devices such as aircraft, aircraft, and electric appliances.

Bolt 200 includes resin molded portion 210 and reinforcing shaft 260 . The bolt 200 is a product in which a resin molded portion 210 is insert-molded around a reinforcing shaft 260 . The bolt 200 can be manufactured by a manufacturing method similar to that of the bolt 100 of the first embodiment.

The resin molded portion 210 of the bolt 200 is made of a synthetic resin material and integrally forms the head portion 220 and the shaft portion 230 . The material of the resin molded portion 210 is the same as that of the resin molded portion 110 of the first embodiment.

Reinforcement shaft 260 of bolt 200 has a rod shape having an axis on axis AX<b>2 of shaft portion 230 . The shape of the reinforcing shaft 260 is cylindrical in this embodiment, but may be cylindrical with a polygonal cross section in other embodiments. The reinforcing shaft 260 is embedded in the resin molded portion 210 from the head portion 220 to the shaft portion 230 . In this embodiment, the reinforcing shaft 260 is embedded in the resin molded portion 210 from the bottom of the tool hole 224 in the head portion 220 to the end portion 232 of the shaft portion 230 . The material of the reinforcing shaft 260 is the same as that of the reinforcing shaft 160 of the first embodiment.

Concavities and convexities are formed on the outer peripheral surface 264 of the reinforcing shaft 260 . The unevenness of the outer peripheral surface 264 is the same as that of the outer peripheral surface 164 of the first embodiment.

The reinforcement shaft 260 has a shaft hole 262 along the axis AX2. The shaft hole 262 is a through hole that penetrates the reinforcing shaft 260 . The shaft hole 262 opens to the end 222 of the head 220 through the tool hole 224 and opens to the end 232 of the shaft 230 .

In the second embodiment, the inner peripheral surface of the shaft hole 262 has a female thread that has a reverse thread relationship with the male thread 234 of the shaft portion 230 . In this embodiment, the male thread 234 of the shaft portion 230 is a right-hand thread, whereas the female thread of the shaft hole 262 is a left-hand thread.

According to the bolt 200 of the second embodiment described above, the reinforcement shaft 260 can improve the strength from the head portion 220 to the shaft portion 230 . In addition, the unevenness of the outer peripheral surface 264 of the reinforcing shaft 260 that bites into the resin molded portion 210 prevents separation of the resin molded portion 210 and the reinforcing shaft 260, and the shaft hole 262 can suppress an increase in mass due to the reinforcing shaft 260. . In addition, by inserting a corresponding pin into the shaft hole 262 and rotating the pin together with the bolt 200 around the axis AX2, and observing the presence or absence of swing due to eccentricity, the presence or absence of misalignment of the reinforcing shaft 260 can be easily inspected. can.

In addition, even if the shaft portion 230 that is broken and separated from the head portion 220 is left behind in the female screw to which it is attached, the female screw thread of the reinforcing shaft 260 that remains in the shaft portion 230 can be fitted with a suitable bolt. By tightening, the shaft portion 230 left behind at the attachment destination can be removed.

Further, the space on the end 222 side of the head portion 220 and the space on the end 232 side of the shaft portion 230 can be communicated through the shaft hole 262 with the bolt 200 assembled. In this way, between the space on the side of the end 222 of the head portion 220 and the space on the side of the end 232 of the shaft portion 230, gas, liquid, fluid, powder, etc. are circulated, and strings, wires, etc. are arranged. can.

Further, when the reinforcing shaft 260 is a conductor, the end 222 side of the head portion 220 and the end 232 side of the shaft portion 230 can be energized via the reinforcing shaft 260 .

C. 3rd Embodiment FIG. 4 : is explanatory drawing which shows the bolt 300 of 3rd Embodiment. FIG. 4(a) is a top view showing the bolt 300. FIG. FIG. 4(b) is a front view showing the bolt 300. FIG. The XYZ axes in FIG. 4 are a coordinate system showing the positional relationship of each part of the bolt 300. As shown in FIG. Each axis in the XYZ axes of FIG. 4 is orthogonal to each other axis. The Z axis in FIG. 4 is an axis parallel to axis AX3 of shaft portion 330 of bolt 300 . The +Z-axis direction is the direction from the shaft portion 330 of the bolt 300 toward the head portion 320 . The −Z-axis direction is the opposite direction of the +Z-axis direction.

The bolt 300 is a headed screw with a male thread 334 formed on a shank 330 extending from a head 320 . In this embodiment, bolt 300 is a hex socket head bolt having a hexagonal tool hole 324 in head 320 . The bolt 300 can be used for fixing parts of various devices such as aircraft, aircraft, and electric appliances.

Bolt 300 includes resin molded portion 310 and reinforcing shaft 360 . The bolt 300 is a product in which a resin molded portion 310 is insert-molded around a reinforcing shaft 360 . The bolt 300 can be manufactured by the same manufacturing method as the bolt 100 of the first embodiment, except that the positioning pin on the shaft portion 330 side is not used.

Resin molded portion 310 of bolt 300 is made of a synthetic resin material, and integrally forms head portion 320 and shaft portion 330 . The material of the resin molded portion 310 is the same as that of the resin molded portion 110 of the first embodiment.

Reinforcement shaft 360 of bolt 300 has a rod shape having an axis on axis AX3 of shaft portion 330 . The shape of the reinforcing shaft 360 is cylindrical in this embodiment, but may be cylindrical with a polygonal cross section in other embodiments. The reinforcing shaft 360 is embedded in the resin molded portion 310 from the head portion 320 to the shaft portion 330 . In this embodiment, the reinforcing shaft 360 is embedded in the resin molded portion 310 from the bottom of the tool hole 324 in the head portion 320 to the middle position of the shaft portion 330 . The material of the reinforcing shaft 360 is the same as that of the reinforcing shaft 160 of the first embodiment.

Concavities and convexities are formed on the outer peripheral surface 364 of the reinforcing shaft 360 . The unevenness of the outer peripheral surface 364 is the same as that of the outer peripheral surface 164 of the first embodiment.

The reinforcement shaft 360 has a shaft hole 362 along the axis AX3. The shaft hole 362 is a through hole that penetrates the reinforcing shaft 360 . Axial bore 362 opens into end 222 of head 220 through tool bore 324 . The −Z-axis direction end of the shaft hole 362 is closed by the resin molded portion 310 .

According to the bolt 300 of the third embodiment described above, the reinforcement shaft 360 can improve the strength from the head portion 320 to the shaft portion 330 . In addition, the unevenness of the outer peripheral surface 364 of the reinforcing shaft 360 that bites into the resin molded portion 310 prevents separation of the resin molded portion 310 and the reinforcing shaft 360, and the shaft hole 362 can suppress an increase in the mass of the reinforcing shaft 360. . In addition, by inserting a corresponding pin into the shaft hole 362 and rotating the pin together with the bolt 300 around the axis AX3 and observing the presence or absence of oscillation due to eccentricity, it is possible to easily inspect the presence or absence of misalignment of the reinforcing shaft 360. can.

D. Fourth Embodiment FIG. 5 is an explanatory diagram showing a bolt 400 according to a fourth embodiment. FIG. 5(a) is a top view showing the bolt 400. FIG. FIG. 5(b) is a front view showing the bolt 400. FIG. The XYZ axes in FIG. 5 are a coordinate system that indicates the positional relationship of each part of the bolt 400 . Each axis in the XYZ axes of FIG. 5 is orthogonal to each other axis. The Z-axis in FIG. 5 is an axis parallel to the axis AX4 of the shaft portion 430 of the bolt 400 . The +Z-axis direction is the direction from the shaft portion 430 of the bolt 400 toward the head portion 420 . The −Z-axis direction is the opposite direction of the +Z-axis direction.

The bolt 400 is a headed screw with a male thread 434 formed on a shaft portion 430 extending from a head portion 420 . In this embodiment, bolt 400 is a hexagon socket head bolt having a hexagonal tool hole 424 in head 420 . The bolt 400 can be used for fixing parts of various devices such as aircraft, aircraft, and electric appliances.

Bolt 400 includes resin molded portion 410 and reinforcing shaft 460 . The bolt 400 is a product in which a resin molded portion 410 is insert-molded around a reinforcing shaft 460 . The bolt 400 can be manufactured by the same manufacturing method as the bolt 100 of the first embodiment except that the positioning pin on the head 420 side is not used.

Resin molded portion 410 of bolt 400 is made of a synthetic resin material, and integrally forms head portion 420 and shaft portion 430 . The material of the resin molded portion 410 is the same as that of the resin molded portion 110 of the first embodiment.

Reinforcement shaft 460 of bolt 400 has a rod shape having an axis on axis AX4 of shaft portion 430 . The shape of the reinforcing shaft 460 is cylindrical in this embodiment, but may be cylindrical with a polygonal cross section in other embodiments. The reinforcing shaft 460 is embedded in the resin molded portion 410 from the head portion 420 to the shaft portion 430 . In this embodiment, the reinforcement shaft 460 is embedded in the resin molded portion 410 from a position in the −Z-axis direction from the tool hole 424 in the head portion 420 to the end portion 432 of the shaft portion 430 . The material of the reinforcing shaft 460 is the same as that of the reinforcing shaft 160 of the first embodiment.

Concavities and convexities are formed on the outer peripheral surface 464 of the reinforcing shaft 460 . The unevenness of the outer peripheral surface 464 is the same as that of the outer peripheral surface 164 of the first embodiment.

The reinforcement shaft 460 has a shaft hole 462 along the axis AX4. The shaft hole 462 is a through hole that penetrates the reinforcing shaft 460 . The shaft hole 462 is open to the end portion 432 of the shaft portion 430 . The end of the shaft hole 362 in the +Z-axis direction is closed by a resin molded portion 410 . As a result, foreign matter can be prevented from entering the end portion 432 of the shaft portion 430 through the shaft hole 462 from the head portion 420 side.

According to the bolt 400 of the fourth embodiment described above, the reinforcement shaft 460 can improve the strength from the head portion 420 to the shaft portion 430 . In addition, the unevenness of the outer peripheral surface 464 of the reinforcing shaft 460 that bites into the resin molded portion 410 prevents separation of the resin molded portion 410 and the reinforcing shaft 460, and the shaft hole 462 suppresses an increase in the mass of the reinforcing shaft 460. . In addition, by inserting a corresponding pin into the shaft hole 462 and rotating the pin together with the bolt 400 around the axis AX4 and observing the presence or absence of oscillation due to eccentricity, it is possible to easily inspect the presence or absence of misalignment of the reinforcing shaft 460. can.

E. Fifth Embodiment FIG. 6 is an explanatory diagram showing a bolt 500 according to a fifth embodiment. FIG. 6(a) is a top view showing the bolt 500. FIG. FIG. 6(b) is a front view showing the bolt 500. FIG. The XYZ axes in FIG. 6 are a coordinate system showing the positional relationship of each part of the bolt 500 . Each axis in the XYZ axes of FIG. 6 is orthogonal to each other axis. The Z axis in FIG. 6 is an axis parallel to the axis AX5 of the shaft portion 530 of the bolt 500 . The +Z-axis direction is the direction from the shaft portion 530 of the bolt 500 toward the head portion 520 . The −Z-axis direction is the opposite direction of the +Z-axis direction.

The bolt 500 is a headed screw with a male thread 534 formed on a shaft portion 530 extending from a head portion 520 . In this embodiment, the bolt 500 is a hexagonal bolt having a hexagonal prism-shaped head 520 . The bolt 500 can be used for fixing parts in various devices such as aircraft, aircraft, and electric appliances.

Bolt 500 includes resin molded portion 510 and reinforcing shaft 560 . The bolt 500 is a product in which a resin molded portion 510 is insert-molded around a reinforcing shaft 560 . The bolt 500 can be manufactured by a manufacturing method similar to that of the bolt 100 of the first embodiment.

Resin-molded portion 510 of bolt 500 is made of a synthetic resin material, and integrally forms head portion 520 and shaft portion 530 . The material of the resin molded portion 510 is the same as that of the resin molded portion 110 of the first embodiment.

Reinforcing shaft 560 of bolt 500 has a rod shape having an axis on axis AX5 of shaft portion 530 . The shape of the reinforcing shaft 560 is cylindrical in this embodiment, but may be cylindrical with a polygonal cross section in other embodiments. The reinforcing shaft 560 is embedded in the resin molded portion 510 from the head portion 520 to the shaft portion 530 . In this embodiment, the reinforcing shaft 560 is embedded in the resin molded portion 510 from the end portion 522 of the head portion 520 to the end portion 532 of the shaft portion 530 . The material of the reinforcing shaft 560 is the same as that of the reinforcing shaft 160 of the first embodiment.

Concavities and convexities are formed on the outer peripheral surface 564 of the reinforcing shaft 560 . The unevenness of the outer peripheral surface 564 is the same as that of the outer peripheral surface 164 of the first embodiment.

The reinforcement shaft 560 has a shaft hole 562 along the axis AX5. The shaft hole 562 is a through hole that penetrates the reinforcing shaft 560 . The shaft hole 562 is opened to the end portion 522 of the head portion 520 and to the end portion 532 of the shaft portion 530 .

According to the bolt 500 of the fifth embodiment described above, the reinforcing shaft 560 can improve the strength from the head portion 520 to the shaft portion 530 . In addition, the unevenness of the outer peripheral surface 564 of the reinforcing shaft 560 that bites into the resin molded portion 510 prevents separation of the resin molded portion 510 and the reinforcing shaft 560, and the shaft hole 562 can suppress an increase in mass due to the reinforcing shaft 560. . In addition, by inserting a corresponding pin into the shaft hole 562 and rotating the pin together with the bolt 500 around the axis AX5 and observing the presence or absence of oscillation due to eccentricity, it is possible to easily inspect the presence or absence of misalignment of the reinforcing shaft 560. can.

Further, the space on the end portion 522 side of the head portion 520 and the space on the end portion 532 side of the shaft portion 530 can be communicated through the shaft hole 562 with the bolt 500 assembled. As a result, between the space on the side of the end 522 of the head portion 520 and the space on the side of the end 532 of the shaft portion 530, gas, liquid, fluid, powder, etc. can be circulated, and strings, wiring, etc. can be arranged. can.

Further, when the reinforcing shaft 560 is a conductor, the end 522 side of the head portion 520 and the end 532 side of the shaft portion 530 can be energized through the reinforcing shaft 560 .

F. Other Embodiments The technology disclosed in this specification is not limited to the above-described embodiments, examples, and modifications, and can be implemented in various configurations without departing from the spirit thereof. For example, among the technical features in the above-described embodiments, examples, and modifications, those corresponding to the technical features in each form described in the summary column of the invention solve some or all of the above-described problems. , or to achieve some or all of the above effects, they can be replaced and combined as appropriate. Moreover, technical features that are not described as essential in this specification can be deleted as appropriate.

For example, the configuration of the female thread of the shaft hole 262 in the second embodiment can be applied to the bolts in the third and fifth embodiments. The configurations of the reinforcing shafts in the second to fourth embodiments can be applied to the bolt 500 of the fifth embodiment. Further, in the above-described embodiments, the tool hole for the bolt is not limited to a hexagonal hole, and may be a tool hole for various screws such as a plus shape, a minus shape, a square hole, and a hexalobular shape. Further, in the above-described embodiments, the head of the bolt is not limited to a cylindrical or hexagonal columnar shape, and may be a truss-shaped, dish-shaped, pan-shaped, or flat-shaped screw head.

DESCRIPTION OF SYMBOLS 100... Bolt 110... Resin molding part 120... Head 122... End part 124... Tool hole 130... Shaft part 132... End part 134... Male screw thread 160... Reinforcing shaft 162... Shaft hole 164... Outer peripheral surface 200... Bolt 210... Resin molded part 220 Head 222 End 224 Tool hole 230 Shaft 232 End 234 External thread 260 Reinforcing shaft 262 Shaft hole 264 Peripheral surface 300 Bolt 310 Resin molded part 320 Head 324... Tool hole 330... Shaft 334... Male thread 360... Reinforcing shaft 362... Shaft hole 364... Outer peripheral surface 400... Bolt 410... Resin molded part 420... Head 424... Tool hole 430... Shaft 432... End Portion 434 Male thread 460 Reinforcing shaft 462 Shaft hole 464 Peripheral surface 500 Bolt 510 Resin molded part 520 Head 522 End 530 Shaft 532 End 534 Male screw 560 Reinforcement Shaft 562 Shaft hole 564 Outer peripheral surface 810, 820 Mold 812, 830 Pin

Claims (3)

A headed screw having a male thread formed on a shaft extending from a head,
a resin molded portion made of a synthetic resin material and integrally forming the head portion and the shaft portion;
a bar-shaped reinforcing shaft embedded in the resin molded portion from the head portion to the shaft portion and having an axis on the axis of the shaft portion;
The reinforcing shaft is
an outer peripheral surface on which unevenness is formed;
A headed screw having a shaft hole open at at least one end of the head and the shaft along the axis of the shaft. 2. The headed screw according to claim 1, wherein said reinforcing shaft further has a female thread formed on the inner peripheral surface of said shaft hole and having a reverse thread relationship with said male thread of said shaft portion. . A method for manufacturing a headed screw in which a male thread is formed on a shank extending from a head, comprising:
a step of preparing a rod-shaped reinforcing shaft having an outer peripheral surface formed with irregularities and a shaft hole opened to at least one end along the axis;
With the positioning pin inserted into the shaft hole of the reinforcing shaft, the axial center of the reinforcing shaft extends from the portion corresponding to the head portion of the mold for the headed screw to the portion corresponding to the shaft portion. a step of positioning the reinforcing shaft at a position overlapping the axial center of the portion corresponding to the shaft;
a step of injecting a synthetic resin material into the mold in which the reinforcing shaft is positioned to integrally mold a resin molded portion that constitutes the head portion and the shaft portion around the reinforcing shaft; , a method of manufacturing headed screws.

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