JP2020109315A - Fastening tool - Google Patents

Abstract

To provide a fastening tool that makes a nut hard to be loosened from a bolt with a simple structure.SOLUTION: A fastening tool includes: an LR bolt 10 that has a rod-shaped first screw portion 14 provided so as to extend from a head portion 12 and formed with a male screw part 14a winding in a first direction on an outer peripheral surface, and a rod-shaped second screw portion 16 provided so as to extend from a tip end of the first screw portion 14 and formed with a male screw part 16a winding in a second direction opposite to the first direction on an outer peripheral surface; a body nut 20 that has a nut portion 22 provided with a screw hole 26 formed with a female screw part 26a screwed with the male screw part 14a of the first screw portion 14 on an inner peripheral surface and a projecting portion 24; an intermediate member 32 that is provided with a screw hole 32 formed with a female screw part 32a screwed with the male screw part 16a of the second screw portion 16 on an inner peripheral surface; and an auxiliary nut 40 that covers the projecting portion 24 of the body nut 20 and the intermediate member 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a fastener including a bolt and a nut.

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

JP, 2018-138814, A

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, and there are problems that the cost increases and the work for fastening is troublesome.

The present invention has been made in view of the above points, and an object of the present invention is to provide a fastening device having a simple configuration in which a nut is unlikely to loosen from a bolt.

The fastening device of the present invention is a rod-shaped first screw portion having a head portion, a male screw portion provided so as to extend from the head portion and wound in a first direction and formed on an outer peripheral surface, and a tip of the first screw portion. A bolt having a rod-shaped second screw portion formed on the outer peripheral surface and having a male screw portion wound in a second direction opposite to the first direction and extending from the nut portion, and the nut portion. Has a protrusion formed on the outer peripheral surface of a male screw portion that is protruded from and is wound in the second direction, and a female screw portion to which the male screw portion of the first screw portion is screwed is formed on the inner peripheral surface. A main body nut provided with a threaded hole formed therein, and an intermediate member provided with a threaded hole having an inner peripheral surface formed with a female threaded portion to which the male threaded portion of the second threaded portion is screwed, A hollow portion formed on the inner peripheral surface of the main body nut, which covers the protrusion and the intermediate member, and in which the female screw portion to which the male screw portion formed on the outer peripheral surface of the protrusion of the main body nut is screwed is formed. And an auxiliary nut that is formed.

According to such a fastener, in the bolt, the first screw portion and the second screw portion have opposite thread winding directions, and moreover, the first screw portion of the bolt and the protrusion of the main body nut. Has a reverse winding direction. Moreover, the auxiliary nut is attached to the protrusion of the body nut so that the auxiliary nut covers the protrusion of the body nut and the intermediate member. As a result, the member to be fastened by the fastener is impacted, or the bolt or the body nut itself is impacted, so that the force acting on the body nut in the direction loosening from the first screw portion of the bolt Even if the bolt is applied, the body nut is prevented from loosening from the first screw portion of the bolt.

In the fastener of the present invention, the diameter of the first threaded portion of the bolt may be larger than the diameter of the second threaded portion.

Further, the inner peripheral surface of the hollow portion of the auxiliary nut has the intermediate portion when the auxiliary nut is attached to the protruding portion of the body nut while covering the protruding portion and the intermediate member of the body nut. It may be configured so as to contact the outer peripheral surface of the member.

Further, the intermediate member may have a truncated cone shape.

In this case, on the inner peripheral surface of the hollow portion of the auxiliary nut, when the auxiliary nut is attached to the protruding portion of the body nut while covering the protruding portion and the intermediate member of the body nut. A tapered portion may be formed so as to contact the side surface of the intermediate member.

Further, the female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is one to which the male screw portion of the right screw in the first screw portion of the bolt is screwed, The female screw portion formed on the inner peripheral surface of the screw hole of the intermediate member is for screwing the male screw portion of the left screw of the second screw portion of the bolt, and The female screw portion formed on the inner peripheral surface of the hollow portion may be screwed with the male screw portion of the left screw of the protrusion of the main body nut.

Alternatively, the female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is one in which the male screw portion of the left screw in the first screw portion of the bolt is screwed, The female screw portion formed on the inner peripheral surface of the screw hole of the intermediate member is for screwing the male screw portion of the right screw in the second screw portion of the bolt, and the auxiliary nut of the auxiliary nut. The female screw portion formed on the inner peripheral surface of the hollow portion may be screwed with the male screw portion of the right screw of the protrusion of the main body nut.

According to the fastener of the present invention, it is possible to prevent the nut from loosening from the bolt with a simple configuration.

It is a side view which shows the structure of the fastening tool by embodiment of this invention. It is a side view which shows the structure of the LR bolt in the fastener shown in FIG. It is a perspective view which shows the structure of the main body nut in the fastener shown in FIG. FIG. 4 is a side view of the main body nut shown in FIG. 3. It is a top view of the main body nut shown in FIG. It is a perspective view which shows the structure of the intermediate member in the fastening tool shown in FIG. It is a side view of the intermediate member shown in FIG. It is a top view of the intermediate member shown in FIG. It is a perspective view which shows the structure of the auxiliary|assistant nut in the fastener shown in FIG. FIG. 10 is a side view of the auxiliary nut shown in FIG. 9. FIG. 10 is a top view of the auxiliary nut shown in FIG. 9. It is explanatory drawing which shows the method of fixing a 2nd member to a 1st member with the fastener shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 12 are views showing a fastening device according to an embodiment of the present invention and a fastening method using such a fastening device. The fastener according to the present embodiment is for fixing the second member 102 to the first member 100, for example. The details of the configuration of such a fastener will be described below.

As shown in FIG. 1, the fastening device according to the present embodiment includes an LR bolt 10, a main body nut 20, an intermediate member 30, and an auxiliary nut 40, and the intermediate member 30 is covered with the auxiliary nut 40. The main body nut 20 and the auxiliary nut 40 are attached to the LR bolt 10 so that the second member 102 is fixed to the first member 100. The details of each component of such a fastener will be described below.

As shown in FIG. 2, the LR bolt 10 is provided so as to extend from the head portion 12, the rod-shaped first screw portion 14 provided so as to extend from the head portion 12, and the tip of the first screw portion 14. It has a rod-shaped second screw portion 16. Here, the center line extending in the longitudinal direction of the first screw portion 14 and the center line extending in the longitudinal direction of the second screw portion 16 are aligned. A right-handed male screw portion 14a is formed on the outer peripheral surface of the first screw portion 14. On the other hand, a male screw portion 16a of a left screw is formed on the outer peripheral surface of the second screw portion 16. In this way, the first threaded portion 14 and the second threaded portion 16 have opposite thread winding directions. Further, as shown in FIG. 2, in the LR bolt 10, the diameter of the first screw portion 14 is larger than the diameter of the second screw portion 16.

As shown in FIGS. 3 to 5, the main body nut 20 has a nut portion 22 formed of a hexagonal nut, and a protrusion portion 24 protruding upward from the upper surface of the nut portion 22. Further, a screw hole 26 having a substantially circular cross section is formed in each of the nut portion 22 and the protrusion portion 24 so as to penetrate the nut portion 22 and the protrusion portion 24, and an inner peripheral surface of the screw hole 26 is formed. , The female screw portion 26a corresponding to the male screw portion 14a of the right screw in the first screw portion 14 of the LR bolt 10 is formed. Then, the male screw portion 14a of the first screw portion 14 of the LR bolt 10 is screwed into the female screw portion 26a formed on the inner peripheral surface of the screw hole 26 of the main body nut 20, whereby the LR bolt 10 The body nut 20 is attached to the first screw portion 14. More specifically, with respect to the first screw portion 14 of the LR bolt 10, the body nut 20 is rotated clockwise (clockwise direction) in FIG. The male screw portion 14a of the screw portion 14 is fitted. Further, the protrusion 24 has a substantially columnar shape, and a male screw portion 24a of a left screw is formed on the outer peripheral surface of the protrusion 24. The height of the main body nut 20 is the same as the length of the first threaded portion 14 protruding from the second member 102 when the second member 102 is attached to the first member 100 by the main body nut 20. Or is slightly larger than this protruding length.

As shown in FIGS. 6 to 8, the intermediate member 30 has the shape of a truncated cone that is a truncated cone having a circle as a bottom surface. In other words, the intermediate member 30 is a three-dimensional figure in which the cone is cut along a plane parallel to the bottom surface and the small cone portion is removed. The side surface 30a of the intermediate member 30 is tapered so as to incline with respect to the axis of the truncated cone (that is, the line extending in the vertical direction in FIG. 7). Further, a screw hole 32 is formed in the intermediate member 30 so as to penetrate the intermediate member 30, and an inner peripheral surface of the screw hole 32 has a left-hand male thread in the second screw portion 16 of the LR bolt 10. A female screw portion 32a corresponding to the portion 16a is formed. Then, the male screw portion 16a of the second screw portion 16 of the LR bolt 10 is screwed into the female screw portion 32a formed on the inner peripheral surface of the screw hole 32 in the intermediate member 30, so that the LR bolt 10 The intermediate member 30 is attached to the second screw portion 16. More specifically, with respect to the second screw portion 16 of the LR bolt 10, while rotating the intermediate member 30 counterclockwise (counterclockwise direction) in FIG. The male screw part 16a of the screw part 16 is fitted.

As shown in FIGS. 9 to 11, the auxiliary nut 40 is composed of, for example, a hexagonal nut, and a hollow portion 42 is formed in the auxiliary nut 40. Here, as shown in FIG. 10, the hollow portion 42 penetrates the auxiliary nut 40, and the second screw portion 16 of the LR bolt 10 can be passed through the hollow portion 42. More specifically, as shown in FIG. 10, the inner peripheral surface of the auxiliary nut 40 facing the hollow portion 42 is composed of a tapered portion 42a and a female screw portion 42b following the tapered portion 42a. The taper portion 42a is inclined with respect to the axis of the auxiliary nut 40 (that is, the line extending in the vertical direction in FIG. 10), and the taper portion 42a is configured to fit the side surface 30a of the intermediate member 30. There is. In other words, when the intermediate member 30 is inserted into the hollow portion 42 of the auxiliary nut 40, the side surface 30a of the intermediate member 30 comes into contact with the tapered portion 42a of the auxiliary nut 40. Therefore, no gap is formed between the side surface 30a and the tapered portion 42a of the auxiliary nut 40. Further, the female screw portion 42 b formed on the inner peripheral surface of the hollow portion 42 of the auxiliary nut 40 corresponds to the left screw male screw portion 24 a of the protrusion 24 of the main body nut 20. The auxiliary nut 40 is attached to the main body nut 20 by screwing the male screw portion 24a of the protrusion 24 of the main body nut 20 into the female screw portion 42b of the hollow portion 42 of the auxiliary nut 40. .. More specifically, with respect to the protrusion 24 of the main body nut 20, while rotating the auxiliary nut 40 counterclockwise (counterclockwise direction) in FIG. 9, the male screw of the protrusion 24 is attached to the female screw portion 42b of the hollow portion 42. The screw portion 24a is fitted.

Next, the operation of fixing the second member 102 to the first member 100 using the fastening device of the present embodiment will be described below with reference to FIG.

First, by passing the first screw portion 14 and the second screw portion 16 of the LR bolt 10 through through holes (not shown) formed in the first member 100 and the second member 102, respectively. , The first screw portion 14 and the second screw portion 16 of the LR bolt 10 project from the second member 102. Next, as shown in FIG. 12A, the body nut 20 is attached to the first screw portion 14 of the LR bolt 10. Specifically, with respect to the first screw portion 14 of the LR bolt 10, while rotating the main body nut 20 clockwise (clockwise direction) in FIG. The male screw portion 14a of the screw portion 14 is fitted. Further, the body nut 20 is fastened to the first screw portion 14 of the LR bolt 10 until the bottom surface of the body nut 20 contacts the second member 102. At this time, the height of the main body nut 20 is equal to or slightly larger than the length of the first screw portion 14 protruding from the second member 102. The portion 14 is hidden by the body nut 20.

Next, as shown in FIG. 12B, the intermediate member 30 is attached to the second screw portion 16 of the LR bolt 10. Specifically, with respect to the second screw portion 16 of the LR bolt 10, while rotating the intermediate member 30 counterclockwise (counterclockwise direction) in FIG. The male screw part 16a of the screw part 16 is fitted. Further, the intermediate member 30 is fastened to the second screw portion 16 of the LR bolt 10 until the bottom surface of the intermediate member 30 contacts the protruding portion 24 of the main body nut 20. Next, as shown in FIG. 12C, the auxiliary nut 40 is put on the protrusion 24 and the intermediate member 30 of the main body nut 20, and the auxiliary nut 40 is attached to the protrusion 24 of the main body nut 20. Specifically, after covering the protrusion 24 and the intermediate member 30 of the main body nut 20 with the auxiliary nut 40, the female nut of the hollow portion 42 is rotated while rotating the auxiliary nut 40 counterclockwise (counterclockwise direction) in FIG. 9. The male screw portion 24a of the protrusion 24 of the main body nut 20 is fitted into the screw portion 42b. Then, the side surface 30a of the intermediate member 30 contacts the tapered portion 42a of the auxiliary nut 40 inside the auxiliary nut 40, and no gap is generated between the side surface 30a of the intermediate member 30 and the tapered portion 42a of the auxiliary nut 40. The auxiliary nut 40 is fastened to the protrusion 24 of the main body nut 20. In this way, as shown in FIG. 12( d ), with the body nut 20 and the intermediate member 30 attached to the first screw portion 14 and the second screw portion 16 of the LR bolt 10, respectively, the auxiliary nut The protrusion 40 and the intermediate member 30 of the main body nut 20 are covered by 40. Further, when the intermediate member 30 is covered with the auxiliary nut 40, even if a force in a loosening direction is applied to the intermediate member 30 from the second screw portion 16 of the LR bolt 10, the intermediate member 30 is conical. Because of the table shape, the intermediate member 30 is prevented from slipping out of the auxiliary nut 40.

In such a fastening device, in the LR bolt 10, the first screw portion 14 and the second screw portion 16 have opposite thread winding directions, and the first screw portion 14 and the second screw portion 16 of the LR bolt 10 are Since the projecting portion 24 of the main body nut 20 has the thread wound in the opposite direction, the main body nut 20 and the intermediate member 30 are less likely to be loosened from the LR bolt 10 and thus an operation effect is obtained. More specifically, the cause of the loosening of the nut from the bolt is that the first member 100, the second member 102, or the like is impacted, or the nut or the bolt itself is impacted. It is conceivable that the nut may loosen from the bolt by applying a force in the direction opposite to the direction in which the bolt is tightened. On the other hand, in the present embodiment, as described above, in the LR bolt 10, the first screw portion 14 and the second screw portion 16 have opposite thread winding directions, and the first screw The body nut 20 and the intermediate member 30 are attached to the portion 14 and the second screw portion 16, respectively. Moreover, the auxiliary nut 40 is attached to the protrusion 24 of the main body nut 20 so that the auxiliary nut 40 covers the protrusion 24 of the main body nut 20 and the intermediate member 30. Therefore, the first member 100, the second member 102, or the like is impacted, or the LR bolt 10 or the main body nut 20 itself is impacted, so that the LR bolt 10 is not attached to the main body nut 20. Even if a force in the direction of loosening the first screw portion 14 is applied, the intermediate member 30 does not loosen from the second screw portion 16 of the LR bolt 10, so that the main body nut 20 has the first screw portion 14 of the LR bolt 10. Is prevented from coming loose.

More specifically, in the present embodiment, the intermediate member 30 is attached to the second screw portion 16 of the LR bolt 10, and the intermediate member 30 is covered with the auxiliary nut 40. Although the auxiliary nut 40 is attached to the protrusion 24 of the body nut 20, the direction in which the auxiliary nut 40 is tightened on the protrusion 24 of the body nut 20 and the body nut 20 is the first screw portion 14 of the LR bolt 10. The tightening direction is opposite. Therefore, even when a force in the direction of loosening the first nut 14 of the LR bolt 10 is applied to the main body nut 20, for example, even when a force in the same direction is also applied to the auxiliary nut 40, the direction of this force Is in a direction in which the auxiliary nut 40 is to be tightened on the protrusion 24 of the main body nut 20, the auxiliary nut 40 does not loosen from the protrusion 24 of the main body nut 20. Then, even if a force in the direction loosening from the first screw portion 14 of the LR bolt 10 is applied to the main body nut 20, the main body nut 20 is moved to the second member 102 side by the intermediate member 30 covered by the auxiliary nut 40. Since the body nut 20 is pressed, it is possible to prevent the body nut 20 from coming loose from the first screw portion 14 of the LR bolt 10.

The fastener of this embodiment is not limited to the above configuration. As another example of the fastening device of the present embodiment, a male screw portion 14a of a left screw instead of a right screw is formed on the outer peripheral surface of the first screw portion 14 of the LR bolt 10, and the screw of the body nut 20 is formed. A female screw portion 26a into which the male screw portion 14a of the left screw is screwed may be formed on the inner peripheral surface of the hole 26. In this case, a male screw portion 24a of a right screw, not a left screw, is formed on the outer peripheral surface of the protrusion 24 of the main body nut 20, and the right screw is formed on the inner peripheral surface of the hollow portion 42 of the auxiliary nut 40. The female screw portion 42b with which the male screw portion 24a is screwed is formed. Further, a right-handed male thread portion 16a, not a left-handed thread, is formed on the outer peripheral surface of the second screw portion 16 of the LR bolt 10, and a right-handed male thread is formed on the inner peripheral surface of the screw hole 32 of the intermediate member 30. A female screw portion 32a is formed to which the portion 16a is screwed. Even in such a fastening device, in the LR bolt 10, the first screw portion 14 and the second screw portion 16 have opposite thread winding directions, and the first screw portion 14 of the LR bolt 10 and Since the protrusions 24 of the main body nut 20 have the threads wound in the opposite directions, the main body nut 20 can be prevented from coming loose from the LR bolt 10.

The intermediate member 30 is not limited to the truncated cone shape. As the intermediate member 30, a shape other than the truncated cone shape may be used as long as it does not come out upward from the auxiliary nut 40 when covered with the auxiliary nut 40. As still another example of the fastening device according to the present embodiment, a substantially columnar intermediate member 30 having a screw hole 32 may be used. When the substantially columnar intermediate member 30 is used, the auxiliary nut 40 is provided with a slip-off preventing member for preventing the intermediate member 30 from slipping upward from the hollow portion 42 of the auxiliary nut 40. It is preferable. When the length of the second screw portion 16 of the LR bolt 10 is relatively short, the hollow portion 42 penetrates the auxiliary nut 40 as long as the auxiliary nut 40 can cover the intermediate member 30. Those that have not been used may be used.

10 LR bolt 12 Head part 14 1st screw part 14a Male screw part 16 2nd screw part 16a Male screw part 20 Body nut 22 Nut part 24 Projection part 24a Male screw part 26 Screw hole 26a Female screw part 30 Intermediate member 30a Side surface 32 Screw hole 32a Female screw portion 40 Auxiliary nut 42 Hollow portion 42a Tapered portion 42b Female screw portion 100 First member 102 Second member

Claims (7)

A head part, a rod-shaped first screw part formed so as to extend from the head part and wound in a first direction and formed on an outer peripheral surface, and a first screw part provided so as to extend from a tip end of the first screw part; A bolt having a rod-shaped second screw portion having an outer peripheral surface formed with a male screw portion wound in a second direction opposite to the direction 1;
A female screw having a nut portion and a projection portion protruding from the nut portion and having a male screw portion wound in the second direction and formed on an outer peripheral surface, to which the male screw portion of the first screw portion is screwed. A main body nut provided with a screw hole whose part is formed on the inner peripheral surface,
An intermediate member provided with a screw hole having an internal peripheral surface formed with a female screw portion to which the male screw portion of the second screw portion is screwed;
A hollow portion formed on the inner peripheral surface that covers the protrusion and the intermediate member of the main body nut, and a female screw portion to which the male screw portion formed on the outer peripheral surface of the protrusion of the main body nut is screwed is formed. Auxiliary nut that is formed,
Fastening device with. The fastener according to claim 1, wherein a diameter of the first screw portion is larger than a diameter of the second screw portion in the bolt. The inner peripheral surface of the hollow portion of the auxiliary nut has the intermediate member when the auxiliary nut is attached to the protruding portion of the body nut in a state of covering the protruding portion and the intermediate member of the body nut. The fastening device according to claim 1 or 2, which is configured to come into contact with the outer peripheral surface. The fastener according to any one of claims 1 to 3, wherein the intermediate member has a truncated cone shape. The intermediate member when the auxiliary nut is attached to the protrusion of the main body nut while covering the protrusion and the intermediate member of the main body nut on the inner peripheral surface of the hollow portion of the auxiliary nut. The fastener according to claim 4, wherein a taper portion that contacts the side surface of the fastener is formed. The female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is one to which the male screw portion of the right screw of the first screw portion of the bolt is screwed, and the intermediate member The female screw portion formed on the inner peripheral surface of the screw hole is a portion to which the male screw portion of the left screw of the second screw portion of the bolt is screwed, and the hollow of the auxiliary nut. 6. The female threaded portion formed on the inner peripheral surface of the portion is to be screwed with the male threaded portion of the left-hand thread of the protrusion of the main body nut. Fastening device described. The female screw portion formed on the inner peripheral surface of the screw hole of the main body nut is one to which the male screw portion of the left screw of the first screw portion of the bolt is screwed, and the intermediate member The female threaded portion formed on the inner peripheral surface of the screw hole is to be screwed with the male threaded portion of the right-hand thread in the second threaded portion of the bolt, and the hollow of the auxiliary nut. The female screw portion formed on the inner peripheral surface of the portion is one to which the male screw portion of the right-hand screw in the protrusion of the main body nut is screwed. Fastening device described.

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