JP2020034092A - Falling prevention device - Google Patents

Abstract

To provide a falling prevention device that is easily attached to a bolt.SOLUTION: A falling prevention device 1 includes a coil spring part 2 for a bolt, a first protrusion 3, a second protrusion 4, an extension part 5 and a curved body 6. The coil spring part 2 for the bolt has a first coil strand 2A being wound substantially in a circular shape and substantially in the same diameter. The curved body 6 is curved substantially in the circular shape in response to a winding shape of the first coil strand 2A of the coil spring part 2 for the bolt, and has an outer diameter larger than an inner diameter of the coil spring part 2 for the bolt. A slit 7 is formed in the curved body 6. The curved body 6 can be arranged concentrically with the coil spring part 2 for the bolt in a space surrounded by the first coil strand 2A of the coil spring part 2 for the bolt. The coil spring part 2 for the bolt is pushed in the direction to expand the diameter by the curved body 6 arranged in the space surrounded by the first coil strand 2A. The inner diameter of the coil spring part 2 for the bolt is expanded, and in this state, the falling prevention device 1 can be attached to the bolt without being rotated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fall prevention device. More specifically, the present invention relates to a stopper for preventing a fixed object or a nut from falling off a bolt.

  Generally, as a method for fixing two members constituting a building structure, a method of fixing by welding or a method of fastening with bolts and nuts are used.

  In addition, fixing by welding requires welding equipment, it takes time and effort for construction, and when releasing the fixation, equipment is also required, and it takes time and effort to release the fixing, so it is fastened with bolts and nuts Many methods have been adopted.

  However, in the method of fastening with bolts and nuts, the bolts and nuts may be loosened after fastening due to vibrations, etc., so the bolts and nuts loosen, and the fixed objects and nuts fall off the bolts Several inventions have been proposed to avoid this.

For example, Patent Literature 1 discloses a loosening stopper 100 as shown in FIG.
That is, the loosening stopper 100 prevents the nut 102 screwed into the bolt 101 from loosening.

The loosening stopper 100 includes a coil spring 104 shown in FIG. 8A and a ring member 106 shown in FIG. 8B.
Further, the coil spring 104 is slightly smaller than the outer diameter of the bolt 101, and is formed in a spiral shape with an inner diameter capable of engaging with the screw groove while expanding in the radial direction by elastically deforming.

  Further, the distal end portion 105 of the wire 107 of the coil spring 104 is processed diagonally as shown in FIG. 8B. As a result, the distal end portion 105 is screwed into the gap between the bolt 101 and the nut 102, and the distal end portion 105 functions as a stopper, so that the nut 102 cannot rotate in the return direction.

  Also, as shown in FIG. 8B, the diameter of the upper surface, ie, the surface opposite to the surface facing the nut 102, and the diameter of the lower surface, ie, the surface facing the nut 102, are different from each other. Are formed in an inclined cylindrical shape.

The inner diameter of the ring member 106 is substantially the same as the outer diameter of the coil spring 104 mounted on the screw groove of the bolt 101.
In addition, as shown in FIG. 8B, by attaching the ring member 106 so as to cover the outer periphery of the coil spring 104 attached to the thread groove, the attachment of the loosening stopper 100 becomes more reliable.

Japanese Utility Model Registration No. 3128915

By the way, the loosening stopper described in Patent Literature 1 can surely be mounted on the thread groove, but there is no device for facilitating the mounting on the thread groove.
Therefore, when the locking device described in Patent Document 1 must be quickly mounted on the thread groove of the bolt, there is a possibility that the mounting of the locking device may be delayed.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a fall-off prevention device that can be easily attached to a bolt.

  In order to achieve the above object, a fall prevention device of the present invention includes a coil spring portion for a bolt having a first coil wire wound in a substantially circular shape with substantially the same diameter, and the first coil wire. And is disposed at a position more distant from the winding center of the coil spring portion for the bolt than the first coil wire in the same direction as the winding radial direction of the coil spring portion for the bolt. A first protruding portion having a second coil wire, extending from the other end of the first coil wire, and extending in the same direction as the winding radial direction of the bolt coil spring portion; A second protrusion having a third coil wire disposed at a position further away from the winding center of the coil spring portion for the bolt than the coil wire of the above, and the second coil of the first protrusion Substantially perpendicular to the winding radius direction of the bolt coil spring from the strand Extending in the same direction as the extension direction, and having an extension coil wire that can contact the side surface of the nut, and corresponding to the winding shape of the first coil wire of the coil spring portion for the bolt. The bolt coil spring portion is curved and has an outer diameter larger than the inner diameter of the bolt coil spring portion, and is surrounded by the first coil element wire of the bolt coil spring portion. And a curved body that can be arranged concentrically.

  Here, the bolt coil spring portion having the first coil element wire wound in a substantially circular shape with substantially the same diameter can be fitted into the thread groove formed in the leg portion of the bolt.

  In addition, the first coil strand extends from one end of the first coil strand and is further away from the winding center of the bolt coil spring section than the first coil strand in the same direction as the winding radial direction of the bolt coil spring section. A first projecting portion having a second coil wire disposed at a position, and extending from the other end of the first coil wire, and in the same direction as the winding radius direction of the bolt coil spring portion. The second projecting portion having the third coil wire disposed at a position farther from the winding center of the coil spring portion for the bolt than the first coil wire makes it possible to use a general tool, for example, a socket tool, to perform the present operation. The drop prevention device of the invention is easy to rotate.

  The extension coil extends from the second coil element wire of the first protrusion in the same direction as the direction substantially orthogonal to the winding radial direction of the coil spring portion for the bolt, and can contact the side surface of the nut. Due to the extension having the element wire, even if the nut tries to rotate in the loosening direction, the corner of the nut hits the extension, and the rotation of the nut in the further loosening direction can be suppressed.

  Further, the bolt coil spring portion is curved in accordance with the winding shape of the first coil element wire, has an outer diameter larger than the inner diameter of the bolt coil spring portion, and According to the present invention, in a state where the curved body is arranged in the space surrounded by the first coil wire, the curved body can be arranged concentrically with the coil spring portion for the bolt in the space surrounded by the first coil wire. When the bolt leg is passed through the bolt coil spring portion of the stopper, the inner diameter of the bolt coil spring portion is expanded, and the bolt coil spring portion is formed on the bolt leg portion obstructed by the curved body. Since the bolt coil spring portion does not abut against the thread or the thread groove, the fall prevention device of the present invention can quickly contact the nut attached to the bolt without rotating.

  Further, when the leg of the bolt is passed through the bolt coil spring portion of the drop-prevention device of the present invention in a state where the curved body is disposed in the space surrounded by the first coil element wire, the lower edge of the curved body is a nut. , The bent body comes out of the coil spring portion for the bolt.

  Further, the falling-off preventing device of the present invention extends from the extended coil wire, and has a winding range of a size that can contact the side surface of the nut, and is concentric with the coil spring portion for the bolt, and has a plurality of May be provided with a nut coil spring portion having a fourth coil element wire wound in a polygonal shape, the top of which is disposed at substantially the same distance from the winding center of the bolt coil spring portion. it can.

  In this case, rotation of the nut in the loosening direction can be further suppressed.

  Further, in the fall-off preventing device of the present invention, a slit extending between the one end and the other end in a direction substantially orthogonal to the circumferential direction of the curved body, and communicating between the inside and the outside of the curved body having a space formed therein. May be formed in a curved body.

  In this case, the diameter of the curved body can be reduced or returned to the diameter before the reduction.

  In the drop-off preventing device of the present invention, the second coil element wire of the first projection and the third coil element wire of the second projection are respectively wound and have a linear first shape. A hook portion, a connecting portion extending from one end of the first hook portion in a direction substantially perpendicular to a direction in which the first hook portion extends, and being linear, and a first hook portion of the connecting portion; A first hook portion extending from a location opposite to the connected portion, having a linear shape, and having a second hook portion facing the first hook portion; and a first hook portion and a second hook portion. Can be arranged in the space surrounded by the second coil wire of the first protrusion and the space surrounded by the third coil wire of the second protrusion, respectively. The length of the portion is determined from the length of the line connecting the winding center of the first projection and the winding center of the second projection to the length of the winding radius of the first projection and the length of the first projection. Winding radius of the shorter clamping pressure body than the length excluding the length of the projecting portion of a falling-off prevention device of the present invention may be configured to further include.

  In this case, since the second coil wire of the first projecting portion and the third coil wire of the second projecting portion are respectively wound, the first hook portion and the second hook portion are linear. Are easily inserted and arranged in the space of the first protrusion and the space of the second protrusion, respectively.

  In addition, the length of the connecting portion is determined from the length of the line connecting the winding center of the first protrusion and the winding center of the second protrusion to the length of the winding radius of the first protrusion and the length of the first protrusion. 2 is shorter than the length excluding the winding radius of the second protrusion, that is, the inner side located on the second protrusion side of the first protrusion and the first protrusion side of the second protrusion. When the first hooking portion and the second hooking portion are inserted into the space of the first projecting portion and the space of the second projecting portion, respectively, The first protrusion and the second protrusion can move toward each other to increase the inner diameter of the bolt coil spring.

  Further, the first and second hooks of the pinch body are inserted into the space of the first projection and the space of the second projection, respectively, and the bolt for the drop-off prevention device of the present invention is used. When the bolt leg portion is passed through the coil spring portion, the inner diameter of the bolt coil spring portion is widened, so the bolt coil spring portion does not come into contact with the threads or thread grooves formed on the bolt leg portion, and the bolt The stopper of the present invention can be quickly brought into contact without rotating the nut attached to the nut.

  In the drop-off preventing device of the present invention, the nut coil spring portion is located in a predetermined range from the tip of the fourth coil wire and extends in a direction intersecting the direction in which the extension coil wire of the extension extends. It can be configured to have an end region that extends and is located at a position within a predetermined range from the extension and at a position after the fourth coil wire has been wound once.

Here, the “predetermined range” means a range in which the end region of the fourth coil wire can hit the extension when the nut attached to the bolt is rotated in the nut loosening direction. .
Also, in this case, the nut coil spring portion is mounted on the nut, and even if the nut attempts to rotate in the loosening direction, the end region hits the extended portion and it is difficult to move further, so that the rotation of the nut in the loosening direction is suppressed. be able to.

  Further, in order to achieve the above object, a fall prevention device of the present invention includes a coil spring portion for a bolt having a first coil wire wound in a substantially circular shape with substantially the same diameter; It extends from one end of the wire and is located at a position further from the winding center of the coil spring for the bolt than the first coil wire in the same direction as the winding radial direction of the coil spring for the bolt. And a first projection having a wound second coil wire, and a winding of the bolt coil spring portion extending from the other end of the first coil wire. A third coil element, which is arranged in the same direction as the radial direction and further away from the winding center of the coil spring portion for the bolt than the first coil element and has a wound third coil element. 2 from the second coil strand of the first projection and the second projection. A first extending portion extending in the same direction as a direction substantially orthogonal to the winding radial direction of the coil coil portion for the bolt and having an extension coil element wire capable of contacting a side surface of the nut; A hook portion, a connecting portion extending from one end of the first hook portion in a direction substantially perpendicular to a direction in which the first hook portion extends, and being linear, and the first portion of the connecting portion; A second hook portion extending from a portion opposite to the hook portion and having a linear shape, and having a second hook portion facing the first hook portion; Are respectively surrounded by a space surrounded by the second coil element wire of the first projecting part and by the third coil element wire of the second projecting part. And the length of the connecting portion is set between the winding center of the first projecting portion and the second projecting portion. A pinching body shorter than a length obtained by subtracting the length of the winding radius of the first protrusion and the length of the winding radius of the second protrusion from the length of the line connecting the center of rotation; .

  Here, the bolt coil spring portion having the first coil element wire wound in a substantially circular shape with substantially the same diameter can be fitted into the thread groove formed in the leg portion of the bolt.

  In addition, the first coil strand extends from one end of the first coil strand and is further away from the winding center of the bolt coil spring section than the first coil strand in the same direction as the winding radial direction of the bolt coil spring section. A first protruding portion that is disposed at a position and has a wound second coil wire, and extends from the other end of the first coil wire, and is wound around a bolt coil spring portion. A second coil wire which is disposed in a position more distant from the winding center of the coil spring portion for the bolt than the first coil wire in the same direction as the turning radius direction, and has a wound third coil wire; Of the present invention makes it easy to rotate the fall-prevention device of the present invention using a general tool such as a socket tool.

  Also, the first projecting portion extends from the second coil element wire in the same direction as the direction substantially perpendicular to the winding radial direction of the bolt coil spring portion, and can contact the side surface of the nut. By the extension having the extension coil element wire, even if the nut tries to rotate in the loosening direction, the corner of the nut hits the extension and the rotation of the nut in the further loosening direction can be suppressed.

  Further, the first hook having a linear shape is formed by the first projection having the wound second coil element and the second projection having the wound third coil element. The part and the second hook part are easily inserted and arranged in the space of the first protrusion and the space of the second protrusion, respectively.

  In addition, the length of the connecting portion is determined from the length of the line connecting the winding center of the first protrusion and the winding center of the second protrusion to the length of the winding radius of the first protrusion and the length of the first protrusion. 2 is shorter than the length excluding the winding radius of the second protrusion, that is, the inner side located on the second protrusion side of the first protrusion and the first protrusion side of the second protrusion. When the first hooking portion and the second hooking portion are inserted into the space of the first projecting portion and the space of the second projecting portion, respectively, The first protrusion and the second protrusion can move toward each other to increase the inner diameter of the bolt coil spring.

  Further, the first and second hooks of the pinch body are inserted into the space of the first projection and the space of the second projection, respectively, and the bolt for the drop-off prevention device of the present invention is used. When the bolt leg portion is passed through the coil spring portion, the inner diameter of the bolt coil spring portion is widened, so the bolt coil spring portion does not come into contact with the threads or thread grooves formed on the bolt leg portion, and the bolt The stopper of the present invention can be quickly brought into contact without rotating the nut attached to the nut.

  The fall prevention device according to the present invention is easy to mount on a bolt.

It is a schematic diagram showing a 1st embodiment of a fall prevention implement to which the present invention is applied. It is a schematic diagram showing a situation when a fall prevention device of a first embodiment of the present invention is mounted on a bolt and a nut. It is a schematic diagram showing a situation when a fall prevention device of a first embodiment of the present invention is attached to a bolt and a nut. It is the schematic which shows 2nd Embodiment of the fall prevention tool to which this invention is applied. It is the schematic which shows 3rd Embodiment of the fall prevention tool to which this invention is applied. It is the schematic which shows a mode when attaching the fall prevention tool of the 3rd Embodiment of this invention to a bolt and a nut. It is the schematic which shows a mode when the fall prevention tool of the 3rd Embodiment of this invention is attached to a bolt and a nut. It is the schematic diagram (a) which shows the coil spring which comprises the conventional locking device, and the schematic diagram (b) which shows a mode when attaching the conventional locking device to a bolt.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to provide an understanding of the present invention.
FIG. 1 is a schematic diagram showing a first embodiment of a fall prevention device to which the present invention is applied.
FIG. 2 is a schematic view showing a state in which the fall prevention device according to the first embodiment of the present invention is mounted on a bolt and a nut.
FIG. 3 is a schematic view showing a state in which the fall prevention device of the first embodiment of the present invention is mounted on a bolt and a nut.

A fall prevention device 1 of the present invention shown in FIG. 1 includes a coil spring portion 2 for a bolt.
Here, the bolt coil spring portion 2 has a first coil element wire 2A wound in a substantially circular shape with substantially the same diameter.
The inner diameter of the bolt coil spring portion 2 is slightly smaller than the outer diameter of the leg portion 11B of the bolt 11. This is to generate a contraction force.

Further, the fall prevention device 1 of the present invention includes the first protrusion 3.
Here, the first protrusion 3 has a second coil wire 3A. The second coil wire 3A extends from one end of the first coil wire 2A, and is higher than the first coil wire 2A in the same direction as the winding radial direction of the coil spring portion 2 for the bolt. The bolt coil spring 2 is disposed at a position distant from the center of winding.

  Further, the second coil wire 3A is wound in a substantially circular shape, and a space surrounded by the second coil wire 3A is formed.

Furthermore, the fall prevention device 1 of the present invention includes the second protrusion 4.
Here, the second protrusion 4 has a third coil wire 4A. The third coil wire 4A extends from the other end of the first coil wire 2A on the opposite side to the one end, and the first coil wire 4A extends in the same direction as the winding radial direction of the coil spring portion 2 for the bolt. The coil element wire 2A is disposed at a position more distant from the winding center of the coil spring portion 2 for bolts.

  The third coil wire 4A is wound in a substantially circular shape, and a space surrounded by the third coil wire 4A is formed.

  The winding radius of each of the first protrusion 3 and the second protrusion 4 is smaller than the winding radius of the coil spring 2 for the bolt.

Further, the fall prevention device 1 of the present invention includes the extension portion 5.
Here, the extension part 5 has an extension coil wire 5A. The extension coil wire 5A extends from the second coil wire 3A of the first protrusion 3 in the same direction as the direction substantially orthogonal to the winding radius direction of the coil spring portion 2 for bolts, and When the stopper 1 of the present invention is mounted on the bolt to which the nut is mounted, the bolt can contact the side surface of the nut.

Further, the fall prevention device 1 of the present invention includes the curved body 6.
Here, the curved body 6 is curved in a substantially circular shape corresponding to the winding shape of the first coil element wire 2 </ b> A of the bolt coil spring portion 2, and is larger than the inner diameter of the bolt coil spring portion 2. Has an outer diameter.

Further, the bending body 6 can be arranged concentrically with the coil spring portion 2 for bolts in a space surrounded by the first coil element wire 2A of the coil spring portion 2 for bolts.
The inner diameter of the curved body 6 is larger than the outer diameter of the leg 11B of the bolt 11.

Further, as shown in FIG. 1, since the curved body 6 is formed by bending a plate-shaped object, a space is formed inside the curved body 6.
The bending body 6 is made of, for example, metal and has a function similar to that of a leaf spring. The urging force is such a force that the diameter of the bolt coil spring portion 2 is increased.
Further, the curved body 6 can be made of resin or paper, but the material is not particularly limited.

Further, as shown in FIG. 1, a slit 7 is formed in the curved body 6.
Here, the slit 7 extends by connecting one end in a direction substantially orthogonal to the circumferential direction of the curved body 6 and the other end opposite to the one end, and communicates the inside and the outside of the curved body 6. I have.

Further, since such a slit 7 is formed in the curved body 6, the outer diameter of the curved body 6 can be reduced by pushing the curved body 6 with a hand or the like.
Further, since the bending body 6 has the same function as the leaf spring, even if the outer diameter of the bending body 6 is reduced, the bending body 6 expands and the outer diameter returns by relaxing the pushing force on the bending body 6.
Therefore, the bending body 6 has an outer diameter larger than the inner diameter of the bolt coil spring portion 2, but is concentric with the bolt coil spring portion 2 in a space surrounded by the first coil element wire 2 </ b> A of the bolt coil spring portion 2. Can be placed in

Further, the fall prevention device 1 of the present invention includes a coil spring portion 8 for a nut.
Here, the nut coil spring portion 8 has a fourth coil strand 8A. The fourth coil wire 8A extends from the extension coil wire 5A and has a winding range large enough to be able to contact the side surface of the nut, and is concentric with the coil spring portion 2 for the bolt. Further, the six top portions 8B are wound in a substantially hexagonal shape, which is a shape arranged at substantially the same distance from the winding center of the coil spring portion 2 for the bolt.

  The “winding center” referred to in this specification means that the first coil wire, the second coil wire, the third coil wire, and the fourth coil wire are each wound. Means the center position where there is no entity.

  The center axis line 9 shown in FIG. 1 passes through the winding center of the coil spring portion 2 for bolts and the winding center of the coil spring portion 8 for nuts, and the radial direction of winding of the coil spring portion 2 for bolts and the nut. This is an intangible linear axis extending in a direction substantially perpendicular to the winding radial direction of the coil spring portion 8.

  Further, the “winding range” referred to in this specification means a range in a direction substantially orthogonal to the central axis.

Although not shown, the center of winding of the first protrusion 3 and the center of winding of the second protrusion 4 each pass through a straight central axis having no substance, and the center axis is the first protrusion. It extends in a direction substantially orthogonal to the winding radial direction of the portion 3 and the winding radial direction of the second protrusion 4.
That is, the central axis not shown extends in the same direction as the central axis 9 extends.

Further, the fall prevention device of the present invention does not necessarily have to include the coil spring portion for the nut.
However, it is preferable that the fall prevention device of the present invention includes the nut coil spring portion, because rotation of the nut in the loosening direction can be further suppressed.

In the drop-off preventing device of the present invention, the fourth coil wire of the coil spring portion for the nut does not necessarily have to be wound in a substantially hexagonal shape, and can be appropriately changed according to the shape of the nut.
However, it is preferable that the fourth coil element wire of the coil spring portion for the nut be wound in a substantially hexagonal shape, since the fourth coil element element can be firmly brought into contact with the side surface of the frequently used hexagon nut. .

  Next, a method of attaching the fall prevention device 1 according to the first embodiment of the present invention to the bolt 11 and the nut 12 to which the nut 12 is attached will be described.

  In a state where the outer diameter of the bending body 6 is reduced by pushing the bending body 6 with a hand or the like, the bending body 6 is placed in a space surrounded by the first coil element wire 2A of the bolt coil spring section 2. And concentrically arranged.

When the bending body 6 is placed in the space surrounded by the first coil element wire 2A of the coil spring portion 2 for a bolt, the user releases his / her hand from the bending body 6 to reduce the outer diameter of the bending body 6 that has been reduced. Undo.
Since the outer diameter of the bending member 6 is larger than the inner diameter of the bolt coil spring portion 2, the bolt coil spring portion 2 is pushed by the bending member 6 in the direction in which the diameter increases, and the inner diameter of the bolt coil spring portion 2 increases.

  Further, since the inner diameter of the curved body 6 is larger than the outer diameter of the leg 11B of the bolt 11, the first coil of the coil spring 2 for the bolt is used as shown in FIG. The inner surface of the curved body 6 arranged in the space surrounded by the element wire 2 </ b> A is brought into contact with a screw thread 11 </ b> D formed on the leg 11 </ b> B of the bolt 11, and the fourth coil element of the nut coil spring part 8 is formed. The wire 8 </ b> A is brought into contact with the side surface of the nut 12.

  At this time, the third coil wire 4 </ b> A of the second protrusion 4 is brought into contact with the upper surface of the nut 12.

Next, the bending body 6 is separated from the space surrounded by the first coil element wire 2A of the coil spring portion 2 for the bolt and the leg 11B of the bolt 11, as shown in FIG.
That is, although the lower edge of the curved body 6 contacts the upper surface of the nut 12, the curved body 6 does not move further toward the head 11A of the bolt 11 in the same direction as the direction in which the leg 11B of the bolt 11 extends. Since the part 2 can further slide on the outer surface of the bending body 6 in the same direction as the direction in which the leg 11B of the bolt 11 extends toward the head 11A of the bolt 11, the bending body 6 is a coil spring for the bolt. This escapes from the space surrounded by the first coil element wires 2A of the part 2.

  Then, the inner diameter of the expanded coil coil spring portion 2 is reduced and returned to its original state, and the first coil wire 2A of the bolt coil spring portion 2 is fitted into the thread groove 11C formed in the leg portion 11B of the bolt 11. Combine.

  Also, at this time, since the third coil element wire 4A of the second projecting portion 4 is in contact with the upper surface of the nut 12, the fall prevention device 1 of the present invention rotates the nut 12 counterclockwise, that is, the direction in which the nut 12 is loosened. A force is generated to suppress the rotation to.

  Further, even if the nut 12 tries to rotate in the loosening direction, the corner of the nut 12 hits the extension 5, and the rotation of the nut 12 in the further loosening direction can be suppressed.

  FIG. 4 is a schematic view showing a second embodiment of the fall prevention device to which the present invention is applied.

The stopper 21 of the present invention shown in FIG. 4 includes a bolt coil spring 22.
Here, the bolt coil spring portion 22 has a first coil element wire 22A wound in a substantially circular shape with substantially the same diameter.

Further, the fall-off preventing device 21 of the present invention includes a first protrusion 23 and a second protrusion 24.
Here, the first protrusion 23 has a second coil wire 23A, and the second protrusion 24 has a third coil wire 24A.

The second coil strand 23A extends from one end of the first coil strand 22A, and the third coil strand 24A extends from the other end opposite to the one end of the first coil strand 22A. ing.
Further, the second coil wire 23A and the third coil wire 24A are wound around the coil spring portion 22 for the bolt more than the first coil wire 22A in the same direction as the winding radial direction of the coil spring portion 22 for the bolt. It is located away from the center.

The second coil wire 23A is wound in a substantially circular shape, and a space surrounded by the second coil wire 23A is formed.
The third coil wire 24A is wound in a substantially circular shape, and a space surrounded by the third coil wire 24A is formed.

Further, the falling-off preventing device 21 of the present invention includes the extension portion 25.
Here, the extension part 25 has an extension coil wire 25A. The extension coil wire 25A extends from the second coil wire 23A of the first projecting portion 23 in the same direction as the direction substantially orthogonal to the winding radial direction of the coil spring portion 22 for bolts, and When the stopper 21 of the present invention is mounted on the bolt to which the nut is mounted, the bolt can contact the side surface of the nut.

  Further, the falling-off preventing device 21 of the present invention also includes a curved body, not shown. Here, the configuration of the bending body is the same as the configuration of the bending body 6 included in the fall-off preventing device 1 according to the first embodiment of the present invention.

Further, the fall prevention device 21 of the present invention includes a nut coil spring portion 28.
Here, the nut coil spring portion 28 has a fourth coil wire 28A. The fourth coil wire 8A extends from the extension coil wire 25A, and has a winding range large enough to contact the side surface of the nut, and is concentric with the bolt coil spring portion 22. Further, the six top portions 28B are wound in a substantially hexagonal shape, which is a shape arranged at substantially the same distance from the winding center of the coil spring portion 22 for the bolt.

Further, the nut coil spring portion 28 has an end region 28C.
Here, the end region 28C is a region within a predetermined range from the tip of the fourth coil wire 28A, and extends in a direction intersecting the direction in which the extension coil wire 25A of the extension 25 extends. Further, it is located at a position within a predetermined range from the extension portion 25 and at a position after the fourth coil wire 28A has been wound once.
Here, the “position after the first winding” is a position where the fourth coil wire is wound once and enters the second winding, and a position where the fourth coil wire can come into contact with the extension coil wire 25A. Means

Further, the tip of the end region 28C may be formed in a hook shape bent toward the extension portion 25.
By forming the tip of the end region 28C into such a hook shape, even if the nut coil spring portion 28 is mounted on the nut and the nut is to be rotated in the loosening direction, the hook portion of the end region 28C is extended. And the nut does not rotate in the further loosening direction, so that the rotation of the nut in the loosening direction can be suppressed as compared with the case where the hook portion is not formed in the end region 28C.

The center axis line 29 shown in FIG. 4 passes through the winding center of the coil spring portion 22 for bolts and the winding center of the coil spring portion 28 for nuts. This is an intangible linear axis extending in a direction substantially perpendicular to the winding radial direction of the coil spring portion 28.
Although not shown, the center of winding of the first protrusion 23 and the center of winding of the second protrusion 24 each pass through a straight central axis having no substance, and this central axis is the central axis 29. Extend in the same direction as the extension direction.

  In addition, the method of mounting the stopper 21 of the second embodiment of the present invention to a bolt and a nut to which a nut is attached is performed by using the stopper 1 of the first embodiment of the present invention to which a nut is attached. Since the method is the same as the method of mounting on bolts and nuts, the description is omitted.

FIG. 5 is a schematic view showing a third embodiment of the fall prevention device to which the present invention is applied.
FIG. 6 is a schematic view showing a state in which the fall prevention device according to the third embodiment of the present invention is mounted on a bolt and a nut.
FIG. 7 is a schematic view showing a state in which the fall prevention device according to the third embodiment of the present invention is mounted on a bolt and a nut.

The falling-off prevention device 31 of the present invention shown in FIG. 5 includes a coil spring portion 32 for bolts.
Here, the bolt coil spring portion 32 has a first coil element wire 32A wound in a substantially circular shape with substantially the same diameter.
Further, the inner diameter of the bolt coil spring portion 32 is slightly smaller than the outer diameter of the leg portion 11 </ b> B of the bolt 11.

Further, the fall-off preventing device 31 of the present invention includes a first protrusion 33 and a second protrusion 34.
Here, the first protrusion 33 has a second coil wire 33A, and the second protrusion 34 has a third coil wire 34A.

The second coil wire 33A extends from one end of the first coil wire 32A, and the third coil wire 34A extends from the other end opposite to the one end of the first coil wire 32A. ing.
Further, the second coil wire 33A and the third coil wire 34A are wound around the bolt coil spring portion 32 more than the first coil wire 32A in the same direction as the winding radial direction of the bolt coil spring portion 32. It is located away from the center.

In addition, the second coil wire 33A is wound in a substantially circular shape, and a space surrounded by the second coil wire 33A is formed.
Further, the third coil wire 34A is wound in a substantially circular shape, and a space surrounded by the third coil wire 34A is formed.

Further, the fall-off preventing device 31 of the present invention includes the extension portion 35.
Here, the extension part 35 has an extension coil wire 35A. The extension coil wire 35A extends from the second coil wire 33A of the first projecting portion 33 in the same direction as the direction substantially perpendicular to the winding radial direction of the bolt coil spring portion 32, and When the stopper 31 of the present invention is mounted on the bolt to which the nut is mounted, the bolt can contact the side surface of the nut.

Further, the falling-off preventing device 31 of the present invention includes the pinching member 36.
Here, the sandwiching body 36 has a first hook 36A, a connecting portion 36B, and a second hook 36C.

Further, the first hooking portion 36A is linear.
The connecting portion 36B extends from one end of the first hooking portion 36A in a direction substantially perpendicular to the direction in which the first hooking portion 36A extends, and is linear.
The second hook portion 36C extends from a portion of the connecting portion 36B opposite to the portion connected to the first hook portion 36A, is linear, and has a first hook portion. It faces part 36A.

  The linear first hooking portion 36A and the linear second hooking portion 36C are respectively a space surrounded by the second coil element wire 33A of the first projecting portion 33 and a second projecting portion. It can be arranged in a space surrounded by the third coil strand 34A of the portion 34.

  The length L of the connecting portion 36B is determined by the length of the line connecting the winding center of the first projecting portion 33 and the winding center of the second projecting portion 34 to the winding radius of the first projecting portion 33. Is shorter than the length excluding the length of the winding radius of the second protrusion 34, that is, the inner side and the second protrusion located on the side of the second protrusion of the first protrusion 33. 34 is shorter than the length of a line connecting the inside located on the first projecting portion side.

  Also, as can be seen from the figure, the length of the straight line connecting the first projection 33 and the second projection 34 in the fall-off prevention device 31 of the third embodiment of the present invention is the same as that of the first embodiment of the present invention. -2-It is shorter than the length of the straight line connecting the first protrusions (3, 23) and the second protrusions (4, 24) in the stopper (1, 21) of the embodiment.

  Also, a line connecting the winding center of the first projecting portion 33 and the winding center of the coil spring portion 32 for the bolt, and the winding center of the second projecting portion 34 and the winding center of the coil spring portion 32 for the bolt are shown. The angle between the connecting lines is, for example, 45 to 90 degrees.

Further, the fall-off preventing device 31 of the present invention includes a nut coil spring portion 38.
Here, the nut coil spring portion 38 has a fourth coil wire 38A. The fourth coil wire 38A extends from the extension coil wire 35A, and has a winding range large enough to be able to contact the side surface of the nut, and is concentric with the bolt coil spring portion 32. Further, the six top portions 38B are wound in a substantially hexagonal shape, which is a shape arranged at substantially the same distance from the winding center of the coil spring portion 32 for the bolt.

The center axis line 39 shown in FIG. 5 passes through the winding center of the coil spring portion 32 for bolts and the winding center of the coil spring portion 38 for nuts, and the radial direction of winding of the coil spring portion 32 for bolts and the nut. This is an insubstantial linear axis extending in a direction substantially perpendicular to the winding radial direction of the coil spring portion 38.
Although not shown, the center of winding of the first protrusion 33 and the center of winding of the second protrusion 34 each pass through a straight central axis having no substance, and the central axis is a central axis 39. Extend in the same direction as the extension direction.

  Next, a method of attaching the fall prevention device 31 according to the third embodiment of the present invention to the bolt 11 and the nut 12 to which the nut 12 is attached will be described.

The first hook portion 36A and the second hook portion 36C of the sandwiching body 36 are inserted into the space of the first protrusion 33 and the space of the second protrusion 34, respectively.
Then, the length L of the connecting portion 36 </ b> B is a line connecting the inside located on the second projecting side of the first projecting portion 33 and the inside located on the first projecting portion side of the second projecting portion 34. , The first protrusion 33 and the second protrusion 34 move in a direction approaching each other, and the inner diameter of the coil spring portion 32 for the bolt increases.

  Since the inner diameter of the coil spring portion 32 for the bolt is slightly smaller than the outer diameter of the leg portion 11B of the bolt 11, the inner diameter of the coil spring portion 32 for the bolt can be increased without rotating the stopper 31 of the present invention. As shown in FIG. 6, the leg 11B of the bolt 11 having the thread groove 11C and the thread 11D is inserted into a space surrounded by the first coil wire 32A of the coil spring portion 32 for the bolt, and the nut The fourth coil element wire 38 </ b> A of the coil spring portion 38 is brought into contact with the side surface of the nut 12.

  At this time, the third coil wire 34 </ b> A of the second protrusion 34 is brought into contact with the upper surface of the nut 12.

  Next, as shown in FIG. 7, the first hooking portion 36A and the second hooking portion 36C of the sandwiching body 36 are each a space surrounded by the second coil element wire 33A of the first projecting portion 33. Then, the second protrusion 34 is extracted from the space surrounded by the third coil wire 34A.

  Then, the first protruding portion 33 and the second protruding portion 34 move away from each other, the inner diameter of the expanded coil coil spring portion 32 is reduced and returns to the original position, and the first coil member 32 of the bolt coil spring portion 32 is returned to its original position. The coil wire 32A fits into a thread groove 11C formed in the leg 11B of the bolt 11.

  Also, at this time, since the third coil wire 34A of the second projecting portion 34 is in contact with the upper surface of the nut 12, the drop prevention device 31 of the present invention rotates the nut 12 counterclockwise, that is, the nut 12 is loosened. A force is generated to suppress the rotation to.

  Further, even if the nut 12 tries to rotate in the loosening direction, the corner of the nut 12 hits the extension 35, and the rotation of the nut 12 in the further loosening direction can be suppressed.

  As described above, since the fall prevention device of the present invention includes the curved body, the bolt for the fall prevention device of the present invention is used in a state where the bent body is arranged in the space surrounded by the first coil element wire. When the leg portion of the bolt is passed through the coil spring portion, the inner diameter of the coil spring portion for the bolt is widened, and the coil spring portion for the bolt is hindered by the curved body, and a screw thread or a thread groove formed on the leg portion of the bolt. Since the bolt coil spring portion does not come into contact with the bolt, the falling-off preventing device of the present invention can quickly contact the nut attached to the bolt without rotating.

  Therefore, the fall prevention device of the present invention is easily mounted on the bolt.

  Further, even in the case where the bending member is not provided, the second coil wire of the first projecting portion and the third coil wire of the second projecting portion of the fall prevention device of the present invention are wound respectively. Since the falling-off preventing device of the present invention includes the pinching member, the first hooking portion and the second hooking portion of the pinching member are respectively provided in the space of the first protrusion and the space of the second protrusion. When the leg of the bolt is passed through the coil spring portion of the bolt of the drop-prevention device of the present invention in the state of being inserted into the bolt, the inner diameter of the coil spring portion for the bolt is expanded, so that the thread formed on the leg portion of the bolt is formed. The bolt coil spring portion does not come into contact with the screw groove or the thread groove, and the fall prevention device of the present invention can be quickly brought into contact without rotating the nut attached to the bolt.

  Therefore, the fall prevention device of the present invention is easily mounted on the bolt.

DESCRIPTION OF SYMBOLS 1 Fall-off prevention tool 2 Bolt coil spring part 2A 1st coil strand 3 1st projection 3A 2nd coil strand 4 2nd projection 4A 3rd coil strand 5 Extension 5A Extension coil strand 6 Curved Body 7 Slit 8 Nut Coil Spring 8A 4th Coil Wire 8B Top 9 Center Axis 11 Bolt 11A Head 11B Leg 11C Screw Groove 11D Thread 12 Nut 21 Drop-off Prevention Tool 22 Bolt Coil Spring 22A First 23 First projecting portion 23A Second coil wire 24 Second projecting portion 24A Third coil wire 25 Extended portion 25A Extended coil wire 28 Nut coil spring portion 28A Fourth coil wire 28B Top 28C End area 29 Center axis 31 Captive tool 32 Bolt coil spring 32A First coil wire 33 First protrusion 3A 2nd coil wire 34 2nd projection 34A 3rd coil wire 35 Extension 35A extension coil wire 36 Clamping body 36A 1st hook 36B Connection 36C 2nd hook 38 Nut Coil spring portion 38A Fourth coil wire 38B Top 39 Central axis

Claims (6)

A coil spring portion for a bolt having a first coil element wire wound in a substantially circular shape with substantially the same diameter;
The first coil strand extends from one end of the first coil strand, and is wound from the winding center of the bolt coil spring portion more than the first coil strand in the same direction as the winding radial direction of the bolt coil spring portion. A first projection having a second coil strand disposed at a distance,
The winding center of the coil spring portion for the bolt extends from the other end of the first coil wire and is the same as the winding radial direction of the coil spring portion for the bolt than the first coil wire. A second projection having a third coil strand disposed at a distance from
An extension extending from the second coil element wire of the first projecting portion in the same direction as a direction substantially orthogonal to a winding radial direction of the coil spring portion for the bolt, and capable of contacting a side surface of the nut. An extension having a coil wire;
The bolt coil spring portion is curved in accordance with the winding shape of the first coil element wire, has an outer diameter larger than the inner diameter of the bolt coil spring portion, and A fall prevention device comprising: a coil spring portion for the bolt; and a curved body concentrically disposed in a space surrounded by the first coil element wire of the portion. It extends from the extension coil element wire, and has a winding range of a size capable of contacting the side surface of the nut, and is concentric with the coil spring portion for the bolt, and a plurality of top portions have the coil spring portion for the bolt. The fall prevention device according to claim 1, further comprising: a nut coil spring portion having a fourth coil element wire wound in a polygonal shape having a shape arranged at substantially the same distance from the winding center of the nut. A slit that connects one end and the other end in a direction substantially orthogonal to the circumferential direction of the curved body, and a slit that communicates the inside and the outside of the curved body with a space formed therein is formed in the curved body. The drop-off prevention device according to claim 1 or 2. The second coil element wire of the first protrusion and the third coil element wire of the second protrusion are each wound,
A first hook portion having a linear shape, a connecting portion extending from one end of the first hook portion in a direction substantially perpendicular to a direction in which the first hook portion extends, and being linear; A second hook portion extending from a portion of the connecting portion opposite to the portion connected to the first hook portion and having a linear shape, and facing the first hook portion; Wherein the first hooking portion and the second hooking portion respectively include a space surrounded by the second coil element wire of the first projecting portion and a third space of the second projecting portion. And the length of the connecting portion is a line connecting the winding center of the first projecting portion and the winding center of the second projecting portion. The compression body further comprising a pressing body shorter than the length obtained by subtracting the length of the winding radius of the first protrusion and the length of the winding radius of the second protrusion from the length of the first protrusion. The fall prevention device described. The nut coil spring portion is a region within a predetermined range from the tip of the fourth coil wire, and extends in a direction crossing a direction in which the extension coil wire of the extension portion extends, and The fall-off prevention device according to claim 2, further comprising an end region located at a position within a predetermined range from the extension and at a position after the fourth coil element wire has been wound once. A coil spring portion for a bolt having a first coil element wire wound in a substantially circular shape with substantially the same diameter;
The first coil strand extends from one end of the first coil strand, and is wound from the winding center of the bolt coil spring portion more than the first coil strand in the same direction as the winding radial direction of the bolt coil spring portion. A first protrusion which is disposed at a remote position and has a wound second coil wire;
The winding center of the coil spring portion for the bolt extends from the other end of the first coil wire and is the same as the winding radial direction of the coil spring portion for the bolt than the first coil wire. A second protrusion disposed at a position away from the second coil and having a wound third coil element wire;
An extension extending from the second coil element wire of the first projecting portion in the same direction as a direction substantially orthogonal to a winding radial direction of the coil spring portion for the bolt, and capable of contacting a side surface of the nut. An extension having a coil wire;
A first hook portion having a linear shape, a connecting portion extending from one end of the first hook portion in a direction substantially perpendicular to a direction in which the first hook portion extends, and being linear; A second hook portion extending from a portion of the connecting portion opposite to the portion connected to the first hook portion and having a linear shape, and facing the first hook portion; Wherein the first hooking portion and the second hooking portion respectively include a space surrounded by the second coil element wire of the first projecting portion and a third space of the second projecting portion. And the length of the connecting portion is a line connecting the winding center of the first projecting portion and the winding center of the second projecting portion. A pinching member that is shorter than the length obtained by subtracting the length of the winding radius of the first protrusion and the length of the winding radius of the second protrusion from the length of the first protrusion.

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