JP7043432B2 - Fastening fixture and fastening structure - Google Patents

Description

The present invention relates to a fastening device in which a male screw portion wound in the first direction is attached to a threaded portion formed on an outer peripheral surface, and a fastening structure including such a fastening device.

Conventionally, a method of using bolts and nuts, for example, when attaching another member to one member has been known. As a fastening structure using such bolts and nuts, for example, there is one disclosed in Patent Document 1 and the like. In the fastening structure disclosed in Patent Document 1, the fastening structure does not loosen in the fastened state, can be easily loosened during maintenance, and the bolts and nuts can be reused.

Japanese Unexamined Patent Publication No. 2018-138814

Conventionally, in order to prevent the nut from loosening when the nut is fastened to the bolt, it is necessary to have a complicated structure, which causes a problem that the cost is high and the work of fastening is troublesome.

The present invention has been made in consideration of the above points, and an object of the present invention is to provide a fastening device having a simple structure that makes it difficult to loosen from a screw portion, and a fastening structure provided with such a fastening device. ..

The fastening device of the present invention is a fastening device in which a male screw portion to be wound in the first direction is attached to a screw portion formed on an outer peripheral surface, and is wound in a second direction opposite to the first direction. A base member having a main body portion in which a male screw portion is formed on an outer peripheral surface and a screw hole in which a female screw portion into which the male screw portion of the screw portion is screwed are formed on an inner peripheral surface are provided. Inside is a hollow portion that covers the base member and the nut, and has a female screw portion formed on the inner peripheral surface of the female screw portion to which the male screw portion formed on the outer peripheral surface of the main body portion of the base member is screwed. It is provided with a lid member, which is formed in the above and allows the screw portion to penetrate the hollow portion.

According to such a fastener, the rotation direction when the nut is attached to the screw portion and the rotation direction when the lid member is attached to the base portion while covering the nut are opposite to each other. It can be made difficult to loosen from the screw part.

In the fastening device of the present invention, the base member further has a protrusion that fits into a through hole provided in the member to be fastened by the fastening device, and the main body and the protrusion have a protrusion. A through hole through which the threaded portion passes may be formed.

In this case, the protrusion of the base member may be shaped so as not to rotate with respect to the through hole provided in the member to be fastened by the fastening device.

Further, the lid member has a first hollow portion and a second hollow portion that communicate with each other as the hollow portion, and the diameter of the first hollow portion is larger than the diameter of the screw portion. The diameter of the second hollow portion is larger than the diameter of the first hollow portion, and the female screw portion to which the male screw portion formed on the outer peripheral surface of the main body portion of the base member is screwed is: It may be formed on the inner peripheral surface of the second hollow portion.

In this case, the cross section of the nut is larger than the cross section of the first hollow portion, and the total value of the height of the main body portion and the height of the nut in the base member is the second in the lid member. It may be substantially the same size as the height of the hollow portion.

Further, the female screw portion formed on the inner peripheral surface of the screw hole of the nut is formed by screwing the male screw portion of the left-hand screw in the screw portion, and the outer periphery of the main body portion of the base member. A male screw portion of a right-handed screw may be formed on the surface.

Alternatively, the female screw portion formed on the inner peripheral surface of the screw hole of the nut is the one to which the male screw portion of the right-hand screw in the screw portion is screwed, and the outer periphery of the main body portion of the base member. A male threaded portion of a left-handed screw may be formed on the surface.

The fastening structure of the present invention is a fastening structure including a screw portion having a male screw portion wound in the first direction formed on the outer peripheral surface and a fastening device attached to the screw portion, and the fastening device is a fastening device. , The base member having a main body portion having a male screw portion wound in a second direction opposite to the first direction formed on the outer peripheral surface, and the male screw portion of the screw portion are screwed together. A nut having a screw hole having a female screw portion formed on the inner peripheral surface, and a male screw portion that covers the base member and the nut and is formed on the outer peripheral surface of the main body portion of the base member are screwed. It has a lid member in which a hollow portion in which a matching female screw portion is formed on an inner peripheral surface is formed inside.

According to such a fastening structure, the rotation direction when the nut of the fastener is attached to the screw portion and the rotation direction when the lid member is attached to the base portion while covering the nut in the fastener portion are opposite to each other. Therefore, the simple configuration makes it difficult for the fastener to loosen from the screw portion.

According to the fastening device and the fastening structure of the present invention, it is possible to prevent the fastening device from loosening from the screw portion by a simple structure.

It is a side view which shows the structure of the fastening device by embodiment of this invention. It is a perspective view which shows the structure of the base member in the fastener | fastener shown in FIG. It is a side sectional view of the base member shown in FIG. It is a bottom view of the base member shown in FIG. It is a perspective view which shows the structure of the nut in the fastener | fastener shown in FIG. It is a side sectional view of the nut shown in FIG. It is a perspective view which shows the structure of the lid member in the fastener | fastener shown in FIG. It is a side sectional view of the lid member shown in FIG. 7.

An embodiment of the present invention will be described. 1 to 8 are fastening devices according to the present embodiment. The fastener according to the present embodiment is attached to the screw portion 14 of the bolt 10 for fixing the second member 102 to the first member 100, for example. Details of the configuration of such a fastener will be described below. The bolt 10 to which the fastener according to the present embodiment is attached includes a head portion 12 and a rod-shaped screw portion 14. Further, a male threaded portion 14a of a left-handed screw is formed on the outer peripheral surface of the threaded portion 14.

As shown in FIG. 1, the fastening device according to the present embodiment includes a base member 40, a nut 50, and a lid member 60, and the fastening device including the base member 40, the nut 50, and the lid member 60. Is attached to the threaded portion 14 of the bolt 10.

As shown in FIGS. 2 to 4, the base member 40 has a disk-shaped main body portion 42 and a protrusion 44 protruding downward from the bottom surface of the main body portion 42. A male screw portion 42a of a right-handed screw is formed on the outer peripheral surface of the main body portion 42. Further, as shown in FIG. 1, the protrusion 44 is sized so as to fit into the through hole 102a of the second member 102. More preferably, the protrusion 44 is shaped so as to fit snugly into the through hole 102a of the second member 102. Further, the protrusion 44 is shaped so as not to rotate with respect to the through hole 102a provided in the second member 102. Specifically, the protrusion 44 has a substantially cylindrical shape, and as shown in FIG. 4, a pair of linear notched portions 44a are formed in the cylindrical member. Further, the through hole 102a is also formed with a linear portion corresponding to each notch portion 44a. As a result, the protrusion 44 does not rotate with respect to the through hole 102a of the second member 102. The protrusion 44 is not limited to the shape shown in FIG. As the protrusion 44, for example, a polygonal pillar shape is used, and even if the through hole 102a of the second member 102 has a polygonal cross section corresponding to the polygonal pillar-shaped protrusion 44. good. Further, a through hole 46 having a substantially circular cross section is formed in the main body portion 42 and the protrusion portion 44.

As shown in FIGS. 5 and 6, the nut 50 is composed of, for example, a hexagon nut, and a screw hole 52 having a substantially circular cross section is formed inside the nut 50. Further, on the inner peripheral surface of the screw hole 52, a female screw portion 52a corresponding to the male screw portion 14a of the left-hand screw in the screw portion 14 of the bolt 10 is formed. Then, the nut 50 is attached to the screw portion 14 of the bolt 10 by screwing the male screw portion 14a of the screw portion 14 of the bolt 10 into the female screw portion 52a of the screw hole 52 of the nut 50. .. More specifically, with respect to the screw portion 14 of the bolt 10, the female screw portion 52a of the screw hole 52 and the male screw portion 14a of the screw portion 14 while rotating the nut 50 counterclockwise (clockwise) in FIG. Make it fit.

As shown in FIGS. 7 and 8, a first hollow portion 62 and a second hollow portion 64 having a substantially circular cross section are formed inside the lid member 60, respectively. Here, the first hollow portion 62 and the second hollow portion 64 communicate with each other, and these first hollow portion 62 and the second hollow portion 64 penetrate the lid member 60. Further, the diameter of the first hollow portion 62 is larger than the diameter of the threaded portion 14 of the bolt 10, and the diameter of the second hollow portion 64 is larger than the diameter of the first hollow portion 62. As a result, the screw portion 14 of the bolt 10 can penetrate the first hollow portion 62 and the second hollow portion 64 of the lid member 60. Further, the diameter of the second hollow portion 64 is larger than the diameter of the nut 50, and the height of the second hollow portion 64 is larger than the height of the nut 50. As a result, the nut 50 can be accommodated in the second hollow portion 64 of the lid member 60. Further, at a portion of the lid member 60 facing the second hollow portion 64 and near the bottom of the lid member 60, a female screw portion 60a corresponding to the male screw portion 42a of the main body portion 42 of the base member 40 Is formed. The lid member 60 is attached to the base member 40 by screwing the male screw portion 42a of the main body portion 42 of the base member 40 into the female screw portion 60a of the lid member 60. More specifically, the male screw portion 42a of the main body portion 42 is fitted into the female screw portion 60a while rotating the lid member 60 clockwise (clockwise direction) in FIG. 7 with respect to the main body portion 42 of the base member 40. Try to get stuck.

Further, the cross section of the nut 50 is larger than the cross section of the first hollow portion 62 of the lid member 60, so that the nut 50 cannot pass through the first hollow portion 62 of the lid member 60. Further, as shown in FIG. 1, the total value of the height of the main body portion 42 and the height of the nut 50 in the base member 40 is substantially the same as the height of the second hollow portion 64 in the lid member 60. .. As a result, when the lid member 60 is attached to the base member 40, the upper surface of the nut 50 is pressed against the step portion 66 between the first hollow portion 62 and the second hollow portion 64 inside the lid member 60. It will be like.

Further, in the present embodiment, the first member 100 is fixed to the second member 102 by combining the fastening device composed of the base member 40, the nut 50, and the lid member 60 with the screw portion 14 of the bolt 10. A fastening structure for the purpose is configured.

Next, the operation when the second member 102 is fixed to the first member 100 by using the fastening device of the present embodiment will be described below.

First, the threaded portion 14 of the bolt 10 is threaded by passing the threaded portion 14 of the bolt 10 through the through hole 100a formed in the first member 100 and the through hole 102a formed in the second member 102. It is made to protrude from the second member 102. Next, the base member 40 is attached to the threaded portion 14 of the bolt 10. Specifically, after passing the screw portion 14 of the bolt 10 through the through hole 46 of the base member 40, the protrusion 44 of the base member 40 is inserted into the through hole 102a of the second member 102. As a result, the bottom surface of the disk-shaped main body 42 of the base member 40 comes into contact with the surface of the second member 102. Further, since the pair of cutout portions 44a is formed in the protrusion 44, the protrusion 44 does not rotate with respect to the through hole 102a provided in the second member 102. After that, the nut 50 is attached to the threaded portion 14 of the bolt 10. Specifically, while rotating the nut 50 counterclockwise (counterclockwise) in FIG. 5 with respect to the screw portion 14 of the bolt 10, the female screw portion 52a of the screw hole 52 and the male screw portion of the screw portion 14 Make sure that 14a fits in. Then, as shown in FIG. 1, the bottom surface of the nut 50 is brought into contact with the upper surface of the disk-shaped main body portion 42 of the base member 40. After that, the base member 40 and the nut 50 are covered with the lid member 60. At this time, the screw portion 14 of the bolt 10 penetrates the first hollow portion 62 and the second hollow portion 64 of the lid member 60. Further, the bottom portion of the lid member 60 is attached to the main body portion 42 of the base member 40. Specifically, the lid member 60 is shown in FIG. 7 so that the male screw portion 42a of the main body portion 42 of the base member 40 is fitted into the female screw portion 60a facing the second hollow portion 64 of the lid member 60. The base member 40 is fitted into the second hollow portion 64 of the lid member 60 while rotating clockwise (clockwise). Further, the bottom surface of the lid member 60 is brought into contact with the surface of the second member 102. Further, since the total value of the height of the main body portion 42 and the height of the nut 50 in the base member 40 is substantially the same as the height of the second hollow portion 64 in the lid member 60, the lid member 60 is the base. When attached to the member 40, the upper surface of the nut 50 is pressed by the step portion 66 between the first hollow portion 62 and the second hollow portion 64 inside the lid member 60. As a result, a force that is pressed against the nut 50 toward the base member 40 acts. In this way, as shown in FIG. 1, the base member 40, the nut 50, and the lid member 60 are attached to the threaded portion 14 of the bolt 10.

In such a fastener, the rotation direction when the nut 50 is attached to the screw portion 14 of the bolt 10 (that is, counterclockwise) and the rotation direction when the lid member 60 is attached to the base member 40 while covering the nut 50. Since the direction is opposite to that (that is, clockwise), the effect that the nut 50 is less likely to loosen from the bolt 10 can be obtained. More specifically, as a factor for the nut to loosen from the bolt, an impact is applied to the first member 100, the second member 102, etc., or an impact is applied to the nut or the bolt itself, so that the nut is subjected to an impact. It is conceivable that the nut will loosen from the bolt due to the force applied in the direction opposite to the direction in which the nut is tightened. On the other hand, in the present embodiment, even if the nut 50 loosens from the bolt 10 and the nut 50 tries to separate from the second member 102, the upper surface of the nut 50 is the first hollow portion 62 inside the lid member 60. Since the step portion 66 between the second hollow portion 64 and the second hollow portion 64 is pressed toward the base member 40, the nut 50 is rotated clockwise from the state shown in FIG. 1 with respect to the threaded portion 14 of the bolt 10 (FIG. 1). It cannot be rotated in the clockwise direction when viewed from above.

More specifically, the direction in which the nut 50 loosens from the bolt 10 (that is, clockwise) and the direction in which the lid member 60 covering the nut 50 loosens from the base member 40 (that is, counterclockwise) are opposite to each other. Therefore, even if a force in the direction of loosening from the bolt 10 acts on the nut 50, the lid member 60 is fixed to the base member 40, and the nut 50 is attached to the base member 40 by the step portion 66 of the lid member 60. Since it is pressed toward the bolt 10, it is possible to prevent the nut 50 from loosening from the bolt 10.

Further, when the protrusion 44 is shaped so as not to rotate with respect to the through hole 102a provided in the second member 102, the base member 40 and the nut 50 are formed with respect to the screw portion 14 of the bolt 10. It is possible to prevent the combination of the lid member 60 and the lid member 60 from rotating integrally.

The fastening device of the present embodiment is not limited to the above configuration. As another example of the fastening device of the present embodiment, a male threaded portion 14a of a right-handed screw instead of a left-handed screw is formed on the outer peripheral surface of the threaded portion 14 of the bolt 10, and a screw hole 52 formed in the nut 50. A female screw portion 52a into which the male screw portion 14a of the right-hand screw is screwed may be formed on the inner peripheral surface of the screw. In this case, a male threaded portion 42a of a left-handed screw instead of a right-handed screw is formed on the outer peripheral surface of the main body 42 of the base member 40, and the inner peripheral surface of the lid member 60 facing the second hollow portion 64 is formed. , A female screw portion 60a to which the male screw portion 42a of the left-hand screw is screwed is formed. Even with such a fastener, the rotation direction (that is, clockwise rotation) when the nut 50 is attached to the screw portion 14 of the bolt 10 and the rotation direction (that is, counterclockwise rotation) when the lid member 60 is attached to the base member 40. ) Is in the opposite direction, so that the nut 50 can be prevented from loosening from the bolt 10.

10 Bolt 12 Head part 14 Thread part 14a Male thread part 40 Base member 42 Main body part 42a Male thread part 44 Protrusion part 44a Notch part 46 Through hole 50 Nut 52 Screw hole 52a Female thread part 60 Lid member 60a Female thread part 62 No. 1 Hollow part 64 Second hollow part 66 Stepped part 100 First member 100a Through hole 102 Second member 102a Through hole

Claims (8)

A fastening device in which the male screw portion wound in the first direction is attached to the screw portion formed on the outer peripheral surface.
A base member having a main body portion having a male screw portion wound on the outer peripheral surface formed in a second direction opposite to the first direction.
A nut having a screw hole in which a female screw portion into which the male screw portion of the screw portion is screwed is formed on the inner peripheral surface, and a nut.
A hollow portion is formed inside, which covers the base member and the nut, and has a female screw portion formed on the inner peripheral surface of the female screw portion into which the male screw portion formed on the outer peripheral surface of the main body portion of the base member is screwed. A lid member that allows the threaded portion to penetrate the hollow portion.
Equipped with
The lid member has a first hollow portion and a second hollow portion that communicate with each other as the hollow portion.
The bottom surface of the nut is in contact with the upper surface of the main body portion of the base member, and the upper surface of the nut is pressed by the stepped portion between the first hollow portion and the second hollow portion of the lid member. Instrument. The base member further has a protrusion that fits into a through hole provided in the member to be fastened by the fastener.
The fastening device according to claim 1, wherein a through hole through which the screw portion passes is formed in the main body portion and the protrusion portion. The fastening device according to claim 2, wherein the protrusion of the base member is shaped so as not to rotate with respect to a through hole provided in the member to be fastened by the fastening device. The diameter of the first hollow portion is larger than the diameter of the threaded portion.
The diameter of the second hollow portion is larger than the diameter of the first hollow portion.
Any one of claims 1 to 3, wherein the female screw portion to which the male screw portion formed on the outer peripheral surface of the main body portion of the base member is screwed is formed on the inner peripheral surface of the second hollow portion. Fastening device according to paragraph 1. The cross section of the nut is larger than the cross section of the first hollow portion of the lid member.
The fastening device according to claim 4, wherein the total value of the height of the main body portion and the height of the nut in the base member is substantially the same as the height of the second hollow portion in the lid member. The female screw portion formed on the inner peripheral surface of the screw hole of the nut is the one to which the male screw portion of the left-hand screw in the screw portion is screwed.
The fastening device according to any one of claims 1 to 5, wherein a male screw portion of a right-handed screw is formed on the outer peripheral surface of the main body portion of the base member. The female screw portion formed on the inner peripheral surface of the screw hole of the nut is the one to which the male screw portion of the right-hand screw in the screw portion is screwed.
The fastening device according to any one of claims 1 to 5, wherein a male screw portion of a left-hand screw is formed on the outer peripheral surface of the main body portion of the base member. A threaded portion with a male threaded portion wound in the first direction formed on the outer peripheral surface,
Fastening device attached to the screw part and
It is a fastening structure equipped with
The fastener is
A base member having a main body portion having a male screw portion wound on the outer peripheral surface formed in a second direction opposite to the first direction.
A nut having a screw hole in which a female screw portion into which the male screw portion of the screw portion is screwed is formed on the inner peripheral surface, and a nut.
A hollow portion is formed inside, which covers the base member and the nut, and has a female screw portion formed on the inner peripheral surface of the female screw portion into which the male screw portion formed on the outer peripheral surface of the main body portion of the base member is screwed. With the lid member
Have and
The lid member has a first hollow portion and a second hollow portion that communicate with each other as the hollow portion.
The bottom surface of the nut is in contact with the upper surface of the main body portion of the base member, and the upper surface of the nut is pressed by the stepped portion between the first hollow portion and the second hollow portion of the lid member. Construction.

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