Fastening tool, male-screw-side member, and female-screw-side member

Abstract

To provide a fastening tool capable of reducing the time required for fastening.SOLUTION: The fastening tool comprises: a male-screw-side member 10 having a screw part 11 in which male thread surfaces 12A, 12B where male screw-side screw threads 12 are formed and outer circumferential pieces 13A, 13B where the male screw-side screw threads 12 are not formed are alternately arranged in the outer circumferential direction; and a female-screw-side member 20 having a screw hole 21 in which female thread surfaces 22A, 22B where female screw-side screw threads 22 are formed and inner circumferential pieces 23A, 23B where the female screw-side screw threads 22 are not formed are alternately arranged in the inner circumferential direction, and through which the male thread surfaces 12A, 12B and the female thread surfaces 22A, 22B can threadedly engage with each other.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a fastener, a male thread side member, and a female thread side member. [Background technology]

[0002] A fastener is a fastener that fastens a male screw and a female screw by screwing them together. For example, Patent Document 1 listed below discloses a technique for preventing loosening of this fastener after the male screw and the female screw are fastened together. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-112204 A Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional fasteners such as those in Patent Document 1, the male and female threads are screwed together and rotated relative to each other by their respective lengths to fasten them together, so if the threads are long, it takes a long time to fasten them.

[0005] Therefore, an object of the present invention is to provide a fastener, a male thread side member, and a female thread side member that can shorten the time required for fastening. [Means for solving the problem]

[0006] In order to solve the above problems, a fastener according to a first aspect of the present invention comprises a male thread side member having a threaded portion in which male thread surfaces on which male threads are formed and outer peripheral pieces on which the male threads are not formed are alternately arranged in the outer circumferential direction, and a female thread side member having a screw hole through which the male thread surface and the female thread surface can be screwed together, in which female thread surfaces on which female threads are formed and inner peripheral pieces on which the female threads are not formed are alternately arranged in the inner circumferential direction.

[0007] In addition, in a second aspect of the present invention, the outer peripheral piece is longer in the circumferential direction than the male thread surface, and the inner peripheral piece is longer in the circumferential direction than the female thread surface.

[0008] In addition, in a third aspect of the present invention, the width of the thread on the male thread side on the male thread surface is formed to become narrower toward the tip side of the threaded portion, and the width of the thread on the female thread side on the female thread surface is formed to become narrower toward the back side of the screw hole, corresponding to the thread on the male thread side.

[0009] In addition, in a third aspect of the present invention, the locking portion comprises a convex portion formed on the thread on the male thread side and a concave portion formed on the thread on the female thread side into which the convex portion is fitted in the screwed state.

[0010] In addition, in a fourth aspect of the present invention, the screw further includes a locking portion formed on the threaded portion and the threaded hole so as to lock the relative rotation between the threaded portion and the threaded hole when the male thread surface and the female thread surface are screwed together.

[0011] In addition, in a fifth aspect of the present invention, the locking portion comprises a convex portion formed on the thread on the male thread side and a concave portion formed on the thread on the female thread side into which the convex portion is fitted in the screwed state.

[0012] In addition, in a sixth aspect of the present invention, the convex portion has an end face on the tip side of the threaded portion that is convexly curved, and the concave portion has an end face on the rear side of the screw hole that is concavely curved corresponding to the end face on the tip side of the threaded portion.

[0013] In addition, in a seventh aspect of the present invention, the locking portion comprises a convex portion formed on the thread on the female thread side, and a concave portion formed on the thread on the male thread side, into which the convex portion is fitted in the screwed state.

[0014] In addition, in an eighth aspect of the present invention, the convex portion has an end face on the opening side of the screw hole that is convexly curved, and the concave portion has an end face on the rear end side of the screw portion that is concavely curved corresponding to the end face on the opening side of the screw hole.

[0015] In addition, in a ninth aspect of the present invention, the engagement portion comprises a miniature screw hole which is a screw hole formed penetrating from the inner peripheral piece to the outside of the female thread side member, a hole portion formed in a position opposite to the miniature screw hole in the screwed state of the outer peripheral piece, and a miniature male screw which is a male screw inserted into the hole portion through the miniature screw hole in the screwed state.

[0016] In a tenth aspect of the present invention, the hole portion has a shape extending in the extension direction of the thread of the male screw.

[0017] In addition, the male thread side member in an eleventh aspect of the present invention comprises a male thread surface that is arranged on a portion of the outer circumferential direction of the threaded portion and on which a male thread side thread is formed, and an outer circumferential piece that forms the outer periphery of the threaded portion by being arranged alternately with the male thread surface in the outer circumferential direction of the threaded portion and on which the male thread side thread is not formed.

[0018] In addition, the female thread side member in an eleventh aspect of the present invention comprises a female thread surface that is arranged on a portion of the inner circumference of the screw hole and on which a female thread side thread is formed, and an inner peripheral piece that is arranged alternately with the female thread surface in the inner circumference of the screw hole to form the inner circumference of the screw hole and on which the female thread side thread is not formed. Effect of the Invention

[0019] The fastener, male thread side member, and female thread side member according to the present invention can reduce the time required for fastening. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is an axial cross-sectional view of the fastener according to the first embodiment of the present invention. [Diagram 2]FIG. 2 is a radial cross-sectional view of a threaded portion in a male-threaded side member according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a radial cross-sectional view of a screw hole in a female-threaded side member according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic perspective view illustrating an angle at which a screw portion according to the first embodiment of the present invention is inserted into a screw hole. [Diagram 5] FIG. 2 is a partially enlarged view of the threads of the male thread surface according to the first embodiment of the present invention. [Figure 6] FIG. 2 is a partially enlarged view of the threads of the female thread surface according to the first embodiment of the present invention. [Figure 7] FIG. 4 is an enlarged view illustrating a state in which a convex portion and a concave portion are fitted together according to the first embodiment of the present invention. [Figure 8] FIG. 4 is a partially enlarged view of the threads of a male thread surface according to a second embodiment of the present invention. [Figure 9] FIG. 4 is a partially enlarged view of a thread of a female thread surface according to a second embodiment of the present invention. [Figure 10] FIG. 11 is a radial cross-sectional view showing a screwed state of a male thread surface and a female thread surface according to a third embodiment of the present invention. [Figure 11] FIG. 11 is a cross-sectional view of a fastener according to a fourth embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In order to facilitate understanding of the description, the same reference numerals are used to designate the same components in each drawing, and duplicated description will be omitted as appropriate.

[0022] ==First embodiment== A first embodiment of the present invention will now be described.

[0023] "composition" First, the configuration of a fastener 1 according to a first embodiment of the present invention (hereinafter referred to as "this embodiment") will be described. Fig. 1 is an axial cross-sectional view of a fastener 1 according to this embodiment. As shown in Fig. 1, the fastener 1 includes a male thread side member 10 and a female thread side member 20 as main components.

[0024] Of these, the male threaded member 10 includes a threaded portion 11, a head portion 14, and a cylindrical portion 15 as main portions.

[0025] The threaded portion 11 extends in the axial direction such that male thread surfaces 12A, 12B on which the male thread thread 12 is formed and outer peripheral pieces 13A, 13B on which the male thread thread 12 is not formed are arranged alternately in the outer circumferential direction.

[0026] The outer peripheral piece 13A and the outer peripheral piece 13B are roughly shaped such that a part of the outer peripheral surface of a cylindrical shape is cut away in the circumferential direction.

[0027] Fig. 2 is a radial cross-sectional view of the threaded portion 11. Fig. 2 shows that the threaded portion 11 is formed such that the male threaded surface 12A, the outer peripheral piece 13A, the male threaded surface 12B, and the outer peripheral piece 13B are arranged in this order in the circumferential direction.

[0028] As shown in FIG. 2, the outer diameter of thread 12 (indicated by dashed arrow) is larger than the outer diameters of outer peripheral pieces 13A and 13B (indicated by dashed arrow).

[0029] The head 14 has a larger diameter than the threaded portion 11, and abuts against a surface 20A of the female thread side member 20 directly or via a washer.

[0030] The tubular portion 15 is formed coaxially with the threaded portion 11 on the rear end side of the threaded portion 11, and is a tubular member that connects the threaded portion 11 and the head 14. The tubular portion 15 is preferably cylindrical.

[0031] On the other hand, the female thread side member 20 has a screw hole 21 as a main part.

[0032] The screw hole 21 extends in the axial direction such that female thread surfaces 22A, 22B on which the female thread side thread 22 is formed and inner peripheral pieces 23A, 23B on which the female thread 22 is not formed are arranged alternately in the inner circumferential direction.

[0033] The inner peripheral piece 23A and the inner peripheral piece 23B are roughly shaped such that a part of the inner peripheral surface of a cylindrical shape is cut away in the circumferential direction.

[0034] Fig. 3 is a radial cross-sectional view of the threaded hole 21. Fig. 3 shows that the threaded hole 21 is formed such that the female thread surface 22A, the inner peripheral piece 23A, the female thread surface 22B, and the inner peripheral piece 23B are arranged in this order in the circumferential direction.

[0035] As shown in FIG. 3, the hole diameter of the thread 22 of the screw hole 21 (indicated by dashed arrow) is narrower than the hole diameter of the inner peripheral pieces 23A and 23B (indicated by dashed arrow).

[0036] Furthermore, the female threaded surface 22A and the female threaded surface 22B are formed in a shape that allows them to be screwed into the male threaded surface 12A and the male threaded surface 12B, respectively.

[0037] Fig. 5 is a partially enlarged view of the thread 12 on the male thread surface 12B. Fig. 6 is a partially enlarged view of the thread 22 on the female thread surface 22B. As shown in Figs. 5 and 6, the fastener 1 further includes a protrusion 31 and a recess 32.

[0038] As shown in Fig. 5, the convex portion 31 is formed on the thread 12 of the male thread surface 12B (or may be the male thread surface 12A). The convex portion 31 has an end face 31A on the tip side of the thread portion 11 (the direction of the arrow indicated as "tip side" in Fig. 5) that is convexly curved, and an end face 31B on the rear end side of the thread portion 11 (the direction of the arrow indicated as "rear end side" in Fig. 5) that is flat.

[0039] As shown in Fig. 6, the recess 32 is formed in the thread 22 of the female thread surface 22B (or may be the female thread surface 22A). The recess 32 is fitted with the protrusion 31 when the male thread surface 12B and the female thread surface 22B are screwed together. Furthermore, the recess 32 has an end face 32A on the back side of the screw hole 21 (the direction of the arrow indicated as "back side" in Fig. 6) that is a concave curved surface corresponding to the end face 31A, and an end face 32B on the opening side of the screw hole 21 (the direction of the arrow indicated as "opening side" in Fig. 6) that is a flat surface corresponding to the end face 31B.

[0040] In the threaded portion 11, the outer peripheral piece 13A and the outer peripheral piece 13B are preferably longer than the male threaded surface 12A and the male threaded surface 12B, respectively. In the threaded hole 21, the inner peripheral piece 23A and the inner peripheral piece 23B are preferably longer than the female threaded surface 22A and the female threaded surface 22B, respectively.

[0041] In particular, the outer peripheral pieces 13A and 13B preferably have a length of more than 1 / 2 to 2 / 3 or less of the entire circumference in the circumferential direction of the threaded portion 11. Also, the inner peripheral pieces 23A and 23B preferably have a length of more than 1 / 2 to 2 / 3 or less of the entire circumference in the circumferential direction of the threaded hole 21. Making these lengths more than 1 / 2 makes it easier to insert the threaded portion 11 into the threaded hole 21. Making these lengths 2 / 3 or less can improve the fastening force between the threaded portion 11 and the threaded hole 21.

[0042] More preferably, in the threaded portion 11, the outer peripheral pieces 13A and 13B are respectively about 1% longer than the male thread surfaces 12A and 12B, and in the threaded hole 21, the inner peripheral pieces 23A and 23B are respectively about 1% longer than the female thread surfaces 22A and 22B.

[0043] The axial length of the threaded portion 11 may be about 2.1 times the axial length of the conventional threaded portion. The longer the threaded portion 11 is in the axial direction, the greater the fastening force between the male threaded member 10 and the female threaded member 20. Therefore, if the male threaded surface 12A and the outer peripheral piece 13A, the male threaded surface 12B and the outer peripheral piece 13B, the female threaded surface 22A and the inner peripheral piece 23A, and the female threaded surface 22B and the inner peripheral piece 23B are the same length in the circumferential direction, the axial length of the threaded portion 11 is set to twice the axial length of the conventional threaded portion to obtain the same fastening force as the conventional fastener. However, as described above, if the outer peripheral piece 13A and the outer peripheral piece 13B are made about 1% longer than the male threaded surface 12A and the male threaded surface 12B, and the inner peripheral piece 23A and the inner peripheral piece 23B are made about 1% longer than the female threaded surface 22A and the female threaded surface 22B, the axial length is set to about 2.1 times to obtain the same fastening force as the conventional fastener. The above is a description of the configuration of the fastener 1 according to this embodiment.

[0044] 《Operation》 Next, the operation of the fastener 1 according to this embodiment will be described. Fig. 4 is a schematic perspective view illustrating the angle at which the threaded portion 11 is inserted into the threaded hole 21. As shown in Fig. 4, first, the threaded portion 11 is inserted into the threaded hole 21 at an angle such that the male thread surface 12A and the inner peripheral piece 23B, the male thread surface 12B (not shown) and the inner peripheral piece 23A (not shown), the outer peripheral piece 13A (not shown) and the female thread surface 22A, and the outer peripheral piece 13B and the female thread surface 22B face each other.

[0045] From this state, the threaded portion 11 and the threaded hole 21 are rotated relative to each other so that the male threaded surface 12A and the female threaded surface 22A, and the male threaded surface 12B and the female threaded surface 22B, respectively, are screwed together, and the head 14 of the male thread side member 10 is brought into contact with the surface 20A of the female thread side member 20, thereby fastening the threaded portion 11 and the threaded hole 21 (see Figure 1).

[0046] Fig. 7 is an enlarged view showing a state in which the convex portion 31 is fitted into the concave portion 32. In a state in which the male thread surface 12A and the male thread surface 12B are screwed into the female thread surface 22A and the female thread surface 22B, as shown in Fig. 7, the convex portion 31 is fitted into the concave portion 32, so that the relative rotation between the threaded portion 11 and the threaded hole 21 can be reliably prevented.

[0047] In other words, the convex portion 31 and the concave portion 32 are locking portions that lock the relative rotation between the threaded portion 11 and the threaded hole 21 when the male threaded surfaces 12A and 12B are screwed into the female threaded surfaces 22A and 22B.

[0048] When the threaded portion 11 and the threaded hole 21 are rotated relative to each other so that the male threaded surface 12B and the female threaded surface 22B are screwed together, the convex portion 31 fits into the concave portion 32 from its convex curved end face 31A side, as shown in Figure 7.

[0049] Furthermore, in this embodiment, the relative rotation between the screw portion 11 and the screw hole 21 is prevented by the locking portions (the convex portion 31 and the concave portion 32), so that the head portion 14 is not required.

[0050] "effect" The fastener 1 of this embodiment comprises a male thread side member 10 having a threaded portion 11 in which male thread surfaces 12A, 12B on which a male thread thread 12 is formed and outer peripheral pieces 13A, 13B on which a male thread thread 12 is not formed are alternately arranged in the outer circumferential direction, and a female thread side member 20 having female thread surfaces 22A, 22B on which a female thread thread 22 is formed and inner peripheral pieces 23A, 23B on which a female thread thread 22 is not formed, alternately arranged in the inner circumferential direction, and having a screw hole 21 through which the male thread surfaces 12A, 12B and the female thread surfaces 22A, 22B can be screwed together. Whereas a conventional threaded portion has a continuous thread, threaded portion 11 has outer peripheral pieces 13A and 13B, and therefore has short thread 12 (when the axial length is the same as that of a conventional threaded portion). Similarly, a conventional screw hole has a continuous thread, whereas threaded hole 21 has inner peripheral pieces 23A and 23B, and therefore has short thread 22 (when the axial length is the same as that of a conventional screw hole). Therefore, the fastener 1 according to this embodiment can reduce the time required for fastening compared to conventional screw holes.

[0051] Furthermore, in the fastener 1 according to this embodiment, the outer peripheral pieces 13A, 13B are longer in the circumferential direction than the male thread surfaces 12A, 12B, and the inner peripheral pieces 23A, 23B are longer in the circumferential direction than the female thread surfaces 22A, 22B. As already explained, when the threaded portion 11 is inserted into the threaded hole 21, it is first inserted at an angle such that the male thread surface 12A and the inner peripheral piece 23B, the male thread surface 12B and the inner peripheral piece 23A, the outer peripheral piece 13A and the female thread surface 22A, and the outer peripheral piece 13B and the female thread surface 22B face each other. Therefore, by making the outer peripheral pieces 13A and 13B longer in the circumferential direction than the male thread surfaces 12A and 12B and making the inner peripheral pieces 23A and 23B longer in the circumferential direction than the female thread surfaces 22A and 22B, even if the angle during insertion is slightly misaligned, the threads 12 of the male thread surfaces 12A and 12B do not come into contact with the threads 22 of the female thread surfaces 22A and 22B, and smooth insertion is possible.

[0052] In addition, the fastener 1 of this embodiment further includes locking portions formed on the threaded portion 11 and the threaded hole 21 to lock the relative rotation between the threaded portion 11 and the threaded hole 21 when the male threaded surfaces 12A, 12B and the female threaded surfaces 22A, 22B are in a screwed engagement state. This makes it possible to prevent the screwed state between the male threaded surfaces 12A, 12B and the female threaded surfaces 22A, 22B from loosening.

[0053] In addition, in this embodiment, the locking portion includes a convex portion 31 formed on the male thread 12 and a concave portion 32 formed on the female thread 22 into which the convex portion 31 fits when in a screwed state. This makes it possible to prevent the screwed state between the male threaded surfaces 12A, 12B and the female threaded surfaces 22A, 22B from loosening with a simple structure.

[0054] In this embodiment, the convex portion 31 has an end face 31A on the tip side of the threaded portion 11 that is a convex curved surface, and the concave portion 32 has an end face 32A on the back side of the screw hole 21 that is a concave curved surface. As a result, the male threaded surfaces 12A and 12B are screwed into the female threaded surfaces 22A and 22B, and when the screw portion 11 and the screw hole 21 are rotated relative to each other, the convex portion 31 fits into the concave portion 32 from the convex curved end face 31A side, thereby allowing a smooth fit.

[0055] In addition, the male thread side member 10 in this embodiment is equipped with male thread surfaces 12A, 12B that are arranged in a portion of the outer circumferential direction of the threaded portion 11 and on which the male thread side thread 12 is formed, and outer circumferential pieces 13A, 13B that are arranged alternately with the male thread surfaces 12A, 12B in the outer circumferential direction of the threaded portion 11 to form the outer periphery of the threaded portion 11 and on which the male thread side thread 12 is not formed. While the threaded portion of a conventional male screw has a continuous thread, the threaded portion 11 has outer peripheral pieces 13A and 13B, and therefore the thread 12 is shorter (when the axial length is the same as that of a conventional threaded portion), and therefore the time required for fastening can be reduced compared to the conventional case.

[0056] In addition, the female thread side member 20 in this embodiment is equipped with female thread surfaces 22A, 22B that are arranged in a portion of the inner circumferential direction of the screw hole 21 and on which the female thread side thread 22 is formed, and inner peripheral pieces 23A, 23B that are arranged alternately with the female thread surfaces 22A, 22B in the inner circumferential direction to form the inner circumference of the screw hole 21 and on which the female thread side thread is not formed. As a result, compared to the screw holes of conventional female threads, which have continuous threads, screw hole 21, due to the provision of inner peripheral pieces 23A and 23B, has shorter threads 22 (when the axial length is the same as that of a conventional screw hole), and therefore the time required for fastening can be reduced compared to the conventional case.

[0057] ==Second embodiment== A second embodiment of the present invention will now be described.

[0058] "composition" Fig. 8 is a partially enlarged view of the thread 12 of the male thread surface 12B, and Fig. 9 is a partially enlarged view of the thread 22 of the female thread surface 22B.

[0059] In a second embodiment of the present invention (hereinafter referred to as "this embodiment"), convex portions 34 and concave portions 33 shown in Figs. 8 and 9 are provided instead of the convex portions 31 and concave portions 32 in the first embodiment.

[0060] As shown in Fig. 9, the convex portion 34 is formed on the thread 22 of the female thread surface 22B (or may be the female thread surface 22A). Moreover, the convex portion 34 has an end face 34B on the opening side of the screw hole 21 (the direction of the arrow indicated as "opening side" in Fig. 9) that is convexly curved, and an end face 34A on the rear side of the screw hole 21 (the direction of the arrow indicated as "rear side" in Fig. 9) that is flat.

[0061] As shown in Fig. 8, recess 33 is formed in thread 12 of male thread surface 12B (or may be male thread surface 12A). Recess 33 is adapted to receive protrusion 34 in a screwed state. Furthermore, recess 33 has end face 33B on the rear end side of thread portion 11 (the direction of the arrow indicated as "rear end side" in Fig. 8) in a concave curved shape corresponding to end face 34B, and end face 33A on the front end side of thread portion 11 (the direction of the arrow indicated as "front end side" in Fig. 8) in a flat shape corresponding to end face 34A.

[0062] 《Operation》 When the male threaded surfaces 12A and 12B are screwed together with the female threaded surfaces 22A and 22B, the convex portions 34 and the concave portions 33 engage with each other, so that the relative rotation between the threaded portion 11 and the threaded hole 21 can be reliably prevented, as in the first embodiment.

[0063] In other words, the convex portion 34 and the concave portion 33 are locking portions that lock the relative rotation between the male thread side member 10 and the female thread side member 20 when the male thread surface 12A, the male thread surface 12B and the female thread surface 22A, the female thread surface 22B are screwed together.

[0064] When the threaded portion 11 and the threaded hole 21 are rotated relative to each other so that the male threaded surface 12B and the female threaded surface 22B are screwed together, the protrusion 34 fits into the recess 33 from the side of its convexly curved end face 34B.

[0065] Furthermore, in this embodiment, the relative rotation between the screw portion 11 and the screw hole 21 is prevented by the locking portions (the convex portion 34 and the concave portion 33), so that the head portion 14 (see the first embodiment) does not need to be provided.

[0066] "effect" In this embodiment, the locking portion includes a protrusion 34 formed on the thread on the female thread side, and a recess 33 formed on the thread on the male thread side, into which the protrusion 34 fits when in a screwed state. This makes it possible to prevent the screwed state between the male thread surface 12B and the female thread surface 22B from loosening with a simple structure. Furthermore, since the recess 33 is formed on the male thread 12 and the protrusion 34 is formed on the female thread 22, when the threaded portion 11 and the threaded hole 21 are rotated relative to each other, the length over which the protrusion 34 in this embodiment contacts the slope of the thread 22 is shorter than the length over which the protrusion 31 in the first embodiment contacts the surface of the thread 12. Therefore, the relative rotation between the threaded portion 11 and the threaded hole 21 can be made smoother than in the first embodiment.

[0067] In this embodiment, the end face 34B of the convex portion 34 on the opening side of the screw hole 21 is a convex curved surface, and the end face 33B of the concave portion 33 on the rear end side of the threaded portion 11 is a concave curved surface. As a result, when the screw portion 11 and the screw hole 21 are rotated relative to each other, the protrusion 34 fits into the recess 33 from the side of the convexly curved end face 34B, thereby enabling a smooth fit.

[0068] ==Third embodiment== A third embodiment of the present invention will now be described.

[0069] "composition" 10 is a radial cross-sectional view showing the engagement state between male thread surfaces 12A, 12B and female thread surfaces 22A, 22B according to a third embodiment of the present invention (hereinafter referred to as "this embodiment"). Note that in FIG. 10, the thread 12 is hidden behind the thread 22, and is not shown.

[0070] In this embodiment, in addition to the configuration of the first embodiment (or the second embodiment), a small screw hole 41, a hole 42, and a small male screw 43 are further provided.

[0071] The small screw hole 41 is a screw hole formed penetrating from the inner peripheral piece 23A (or the inner peripheral piece 23B) to the outside of the female-threaded member 20.

[0072] Hole 42 is formed in outer peripheral piece 13A (or outer peripheral piece 13B) at a position facing miniature screw hole 41 in a screwed state between male thread surfaces 12A, 12B and female thread surfaces 22A, 22B. Hole 42 has a substantially elliptical shape extending in the extension direction of thread 12 on the male thread side. Preferably, the aspect ratio of elliptical hole 42 is about 1:3.

[0073] The miniature male screw 43 is a male screw that is inserted into the hole portion 42 through the miniature screw hole 41 in a screwed state.

[0074] 《Operation》 When the threaded portion 11 and the threaded hole 21 are fastened together, the small male screw 43 can be inserted into the hole portion 42 through the small screw hole 41, thereby reliably locking the relative rotation between the threaded portion 11 and the threaded hole 21, as in the first and second embodiments.

[0075] In other words, the small screw hole 41, the hole portion 42, and the small male screw 43 are locking portions that reliably lock the relative rotation between the screw portion 11 and the screw hole 21 when the male screw surface 12A and the male screw surface 12B are screwed into the female screw surface 22A and the female screw surface 22B.

[0076] In this embodiment, the relative rotation between the screw portion 11 and the screw hole 21 can be locked by the locking portion (the small screw hole 41, the hole portion 42, and the small male screw 43) without providing a head portion 14 (see the first embodiment).

[0077] "effect" In this embodiment, the engagement portion comprises a miniature screw hole 41 which is a screw hole formed penetrating from the inner peripheral piece 23A (or the inner peripheral piece 23B) to the outside of the female thread side member 20, a hole portion 42 which is formed at a position opposite to the miniature screw hole 41 when the outer peripheral piece 13A (or the outer peripheral piece 13B) is in the screwed state, and a miniature male screw 43 which is a male screw which is inserted into the hole portion 42 via the miniature screw hole 41 when in the screwed state. As a result, the small male screw 43 is inserted into the hole portion 42 through the small screw hole 41, thereby locking the relative rotation between the threaded portion 11 and the threaded hole 21, thereby preventing the screwed state between the male threaded surfaces 12A, 12B and the female threaded surfaces 22A, 22B from loosening with a simple structure. In addition, the hole portion 42 and the small screw hole 41 are formed in the outer peripheral piece 13A and the inner peripheral piece 23A (or the outer peripheral piece 13B and the inner peripheral piece 23B) on which the threads 12 and 22 are not formed, respectively, making them easy to manufacture.

[0078] In this embodiment, the hole 42 has a shape extending in the direction in which the threads on the male screw side extend. If the center position of hole 42 deviates from miniature screw hole 41 when male thread surface 12A, male thread surface 12B and female thread surface 22A, female thread surface 22B are screwed together, the direction of deviation will be the extension direction of thread 12 and thread 22. Therefore, by making hole 42 have a shape that extends in the extension direction of thread 12 and thread 22, miniature male screw 43 can be inserted into hole 42 via miniature screw hole 41 even if deviation occurs.

[0079] ==Fourth embodiment== A fourth embodiment of the present invention will now be described.

[0080] "composition" Fig. 11 is an axial cross-sectional view of a fastener 2 according to a fourth embodiment of the present invention (hereinafter referred to as "this embodiment"). In this embodiment, instead of the threaded portion 11 and the threaded hole 21 in the first embodiment, a threaded portion 51 and a threaded hole 61 are provided, as shown in Fig. 11.

[0081] The threaded portion 51 is formed such that the width of the male thread side thread 52 formed on the male thread surface 52A and the male thread surface 52B becomes narrower toward the tip side of the threaded portion 51. In addition, the outer diameter of the threaded portion 51 including the male thread surface 52A, the male thread surface 52B, the outer peripheral piece 53A, and other outer peripheral pieces (not shown) is formed such that the outer diameter of the threaded portion 51 becomes smaller toward the tip side of the threaded portion 51.

[0082] The threaded hole 61 is formed such that the width of the female thread 62 formed on the female thread surface 62A and the female thread surface 62B becomes narrower toward the back of the threaded hole 61, corresponding to the male thread 52. Also, the inner diameter of the threaded hole 61 including the female thread surface 62A, the female thread surface 62B, and two inner peripheral pieces (not shown) is formed such that the inner diameter becomes smaller toward the back of the threaded hole 61, corresponding to the outer diameter of the threaded portion 51.

[0083] 《Operation》 Next, the operation of the fastener 2 according to this embodiment will be described. First, similarly to the first embodiment, the threaded portion 51 is inserted into the threaded hole 61 at an angle such that the male threaded surfaces and the inner peripheral pieces, and the outer peripheral pieces and the female threaded surfaces face each other.

[0084] In addition, the inner diameter of the screw hole 61 on the opening side is larger than the inner diameter on the back side, making it easy to insert the screw portion 51.

[0085] From the inserted state as described above, the threaded portion 51 and the threaded hole 61 are fastened together by rotating the threaded portion 51 and the threaded hole 61 relative to each other so that the male threaded surfaces and the female threaded surfaces screw together.

[0086] At this time, since the widths of the threads 52 and 62 become narrower toward the tip side of the threaded portion 51 and the back side of the threaded hole 61, respectively, the fastening force due to relative rotation is improved.

[0087] In other words, the shapes of the threaded portion 51 and the threaded hole 61 themselves serve as a locking portion that locks the relative rotation of the threaded portion 51 and the threaded hole 61 when the respective male threaded surfaces are screwed together.

[0088] "effect" In this embodiment, the width of the thread 52 on the male thread surface 52A and the male thread surface 52B is formed so as to become narrower toward the tip side of the threaded portion 51, and the width of the thread 62 on the female thread surface 62A and the female thread surface 62B is formed so as to become narrower toward the back side of the screw hole 61, corresponding to the thread 52. This makes it possible to prevent the screwed state between the screw portion 51 and the screw hole 61 from loosening with a simple structure.

[0089] == Variations == The present invention is not limited to the above-described embodiment. In other words, the above-described specific example may be modified by a person skilled in the art as appropriate, and the modifications may be included in the scope of the present invention as long as they include the features of the present invention. In addition, the elements of the above-described embodiment and the following modifications may be combined to the extent technically possible, and the combinations of these may be included in the scope of the present invention as long as they include the features of the present invention.

[0090] For example, in each embodiment, the threaded portion 11 (51) has two male threaded surfaces and two outer peripheral pieces, and the threaded hole 21 (61) has two female threaded surfaces and two inner peripheral pieces. However, the present invention does not limit the number of these surfaces. In other words, it is sufficient for the threaded portion 11 (51) to have one or more male threaded surfaces and one or more outer peripheral pieces, and for the threaded hole 21 (61) to have one or more female threaded surfaces and one or more inner peripheral pieces. However, it is preferable that the number of male threaded surfaces, outer peripheral pieces, female threaded surfaces, and inner peripheral pieces be the same.

[0091] The angle of relative rotation between the threaded portion 11 and the threaded hole 21 required to screw together the male and female threaded surfaces varies depending on the number of male and female threaded surfaces. For example, if the circumferential lengths of the male thread surface, outer peripheral piece, female thread surface, and inner peripheral piece are the same, and there is one each of the male thread surface, outer peripheral piece, female thread surface, and inner peripheral piece, the angle of relative rotation will be 180°. Alternatively, if there are two each of the male thread surface, the outer peripheral piece, the female thread surface, and the inner peripheral piece, the angle of relative rotation is 90°. Alternatively, if there are three each of male thread surfaces, outer peripheral pieces, female thread surfaces, and inner peripheral pieces, the angle of relative rotation is 60°. Alternatively, if there are four each of male thread surfaces, outer peripheral pieces, female thread surfaces, and inner peripheral pieces, the angle of relative rotation is 45°. That is, the greater the number of each surface, the smaller the angle of relative rotation between the threaded portion 11 (51) and the threaded hole 21 (61), and the shorter the time required for fastening.

[0092] Regardless of the number of faces, it is preferable that the outer peripheral piece is longer in the circumferential direction than the male threaded surface, and the inner peripheral piece is longer in the circumferential direction than the female threaded surface. In such a case, the angle of relative rotation will naturally change.

[0093] Alternatively, the outer peripheral piece may be shorter than the male thread surface in the circumferential direction, and the inner peripheral piece may be shorter than the female thread surface in the circumferential direction, thereby improving the fastening force between the threaded portion 11 and the screw hole 21.

[0094] In addition, in the fourth embodiment, the width of the thread 52 on the male thread surface 52A and the male thread surface 52B is formed so as to become narrower toward the tip side of the threaded portion 51, but conversely, it may be formed so as to become narrower toward the rear end side of the threaded portion 51. Similarly, in the fourth embodiment, the width of the female thread side thread 62 on the female thread surface 62A and the female thread surface 62B is formed so as to become narrower toward the back side of the screw hole 61 in correspondence with the screw thread 52, but conversely, it may be formed so as to become narrower toward the opening side of the screw hole 61. This improves the fastening force between the screw portion 51 and the screw hole 61.

[0095] Furthermore, the shapes of the threads 12, 22, 52, and 62 are not limited to those shown in Figs. 1 to 11, and can be changed to various shapes.

[0096] 1 and 11 show the head 14 and the tubular portion 15, the tubular portion 15 does not have to be provided. Also, if the locking portion described in each embodiment is provided, the head 14 does not have to be provided.

[0097] That is, Figures 1 and 11 show an example in which the male thread side member 10 has the shape of a male thread itself, including a threaded portion 11 (51), a head 14, and a tubular portion 15, and the female thread side member 20 has the shape of a female thread itself. However, the present invention is not limited to this, and it is sufficient that the male thread side member 10 is provided with a threaded portion 11 (51) having an engagement portion, and the female thread side member 20 is provided with a threaded hole 21 (61) having an engagement portion.

[0098] The fastener 1 (2) can be used for diameters ranging from a few centimeters to several tens of meters. Various materials can be used, such as metal, PVC, glass, and others. Therefore, for example, the male thread member 10 can be used for the mouth of a plastic bottle, and the female thread member 20 can be used for a cap. Or, it can be used for the opening of two pipes that are screwed together and connected, or for a bottle stopper, etc. [Explanation of symbols]

[0099] 1,2...fastener, 10...male thread side member, 11,51...thread portion, 12,52...thread thread (male thread side), 12A,12B,52A,52B...male thread surface, 13A,13B...peripheral piece, 20...female thread side member, 21,61...thread hole, 22,62...thread thread (female thread side), 22A,22B...female thread surface, 23A,23B...inner peripheral piece, 31,34...projection portion, 31A,31B,32A,32B,33A,33B,34A,34B...(tip side) end surface, 32,33...recess, 41...small screw hole, 42...hole portion, 43...small male thread

Claims

1. A male-threaded member having a threaded portion in which male-threaded surfaces on which male-threaded threads are formed and outer peripheral pieces on which the male-threaded threads are not formed are alternately arranged in the outer peripheral direction; In the inner circumferential direction, female thread surfaces on which female thread threads are formed and inner peripheral pieces on which female thread threads are not formed are alternately arranged, and a female thread side member has a threaded hole in which the male thread surface and the female thread surface can be screwed together; Equipped with The threads on the male screw side are formed so as to extend so as to be inclined with respect to the radial direction of the thread portion in an axial cross-sectional view of the thread portion, The threads on the female screw side are formed by extending in a direction corresponding to the threads on the male screw side. Fasteners.

2. The portion of the male screw side member that can be inserted into the screw hole and the screw hole have approximately the same axial length. The fastener of claim 1 .

3. A wall surface is formed on the tip side of the screw hole in the insertion direction of the screw portion. The fastener of claim 1 .

4. A male thread surface is arranged in a portion of the outer circumferential direction of the threaded portion, and a male thread ridge is formed on the male thread surface; An outer circumferential piece that is arranged alternately with the male thread surface in the outer circumferential direction of the threaded portion to form the outer periphery of the threaded portion, and on which the male thread side thread is not formed; Equipped with The threads on the male screw side are formed so as to extend so as to be inclined with respect to the radial direction of the threaded portion in an axial cross-sectional view of the threaded portion, Male thread side component.

5. A female thread surface is arranged in a portion of the inner circumferential direction of the screw hole and on which a female thread is formed; An inner peripheral piece that is arranged alternately with the female thread surface in the inner circumferential direction of the screw hole to form the inner periphery of the screw hole, and on which the female thread side thread is not formed; Equipped with The threads on the female screw side are formed so as to extend so as to be inclined with respect to the radial direction of the screw hole in an axial cross-sectional view of the screw hole. Female thread side component.

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