JP2020012545A - Fall-off preventing tool - Google Patents

Abstract

To provide a fall-off preventing tool capable of preventing a nut which is attached to a bolt, from being unfastened.SOLUTION: A fall-off preventing tool 1 comprises a first coil spring part 2, a second coil spring part 3, a third coil spring part 4, an extension part 5 and a fourth coil spring part 6. The extension part 5 includes an extension coil strand 5A. The extension coil strand 5A extends from a third coil strand 4A of the third coil spring part 4 in the same direction as a direction that is substantially orthogonal to a winding radius direction of the first coil spring part 2 and in a direction opposite to a position of the second coil spring part 3 and can be brought into contact with a side face of a nut. A fourth coil strand 6A that the fourth coil spring part 6 includes extends from the extension coil strand 5A and is wound in a winding range that is sized in contact with the side face of the nut, concentrically with the third coil spring part 4 and in a substantially hexagonal shape that is a shape arranging six apexes 6B in a mutually substantially equal distance from a winding center of the third coil spring part 4.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 Document 1 describes a nut loosening stopper 110 as shown in FIG.
That is, the nut loosening stopper 110 is formed of an elastic element wire, and has the coil spring portion 111 as a main body.

At both ends of the coil spring portion 111, that is, at the outer end 111A and the inner end 111B, a ring-shaped pressing portion, that is, an outer pressing portion 113 and an inner pressing portion 114 are respectively provided by extending wires.
The outer pressing portion 113 and the inner pressing portion 114 are formed in a direction away from the center axis O of the coil spring portion 111.

  Further, the ends of the wires forming at least one of the outer pressing portion 113 and the inner pressing portion 114 are further extended than the inner pressing portion 114, and are extended toward the central axis O rather than the coil spring portion 111. Linear projection 115.

JP 2009-052648 A

  However, the nut loosening stopper described in Patent Literature 1 only presses the upper surface of the nut, and the nut locking effect may not be sufficient.

  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 preventing device capable of preventing a nut attached to a bolt from loosening.

  In order to achieve the above object, a fall prevention device according to the present invention includes a first coil spring portion having a first coil wire wound in a substantially circular shape with substantially the same diameter, and a first coil spring portion. Extending from one end of the first coil element wire and having a winding range larger than the winding range of the first coil spring portion, concentrically with the first coil spring portion, and a plurality of A second coil spring portion having a second coil wire wound in a polygonal shape having a top portion disposed at substantially the same distance from the winding center of the first coil spring portion; The first coil spring portion extends from the other end of the first coil wire, has a winding range larger than the winding range of the first coil spring portion, and is concentric with the first coil spring portion. And the three tops are substantially mutually separated from the winding center of the first coil spring portion. A third coil wire wound in a substantially triangular shape having a shape arranged at a distance, and a connection of the first coil spring portion to the other end of the first coil wire; A third coil spring portion having a third inner angle larger than an inner angle of the other apex, counting from a point, and winding of the first coil spring portion from the third coil element wire of the third coil spring portion; An extension extending in the same direction as the direction substantially orthogonal to the turning radius direction, and in the opposite direction to the position of the second coil spring portion, and having an extension coil wire that can contact a side surface of the nut; Unit.

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

  The first coil spring portion extends from one end of the first coil element wire, has a winding range larger than the winding range of the first coil spring portion, and is concentric with the first coil spring portion. And a second coil spring portion having a second coil element wire wound in a polygonal shape having a plurality of tops arranged at substantially the same distance from the winding center of the first coil spring portion. Thereby, it is easy to rotate the fall prevention device of the present invention using a general tool such as a socket tool.

  The first coil spring portion extends from the other end of the first coil element wire, has a winding range larger than the winding range of the first coil spring portion, and is concentric with the first coil spring portion. And a third coil wire wound in a substantially triangular shape in which three apexes are arranged at substantially the same distance from the winding center of the first coil spring portion, and The third coil spring portion, whose inner angle at the third apex is larger than the inner angle at the other apex portion, counted from the connection point of the first coil spring portion with the other end of the first coil strand, causes the extension portion to have a third inner angle. The third top of the coil spring can be moved as a hinge, so that the extension can pass over the corner of the nut when the cap is rotated in the direction of attachment to the nut, and can be removed from the nut. When the stopper of the present invention is rotated in the direction It can be suppressed from exceeding the extension of the corners of the nut.

  Further, the direction from the third coil strand of the third coil spring portion is the same as the direction substantially orthogonal to the winding radial direction of the first coil spring portion, and the direction opposite to the position of the second coil spring portion. Even if the nut tries to rotate in the loosening direction due to the extension having the extension coil wire that can contact the side surface of the nut, the corner of the nut hits the extension, and the nut is further loosened. Can be prevented from rotating.

  Further, in the fall-off preventing device of the present invention, a third coil element extending from the top of the third coil spring section, counted from the connection point of the first coil spring section with the other end of the first coil element wire. The wire has a substantially linear shape, and a connection point between the third coil wire of the third coil spring portion and the other end of the first coil wire of the first coil spring portion, and a winding of the first coil spring portion. The rotation center and the extension may be configured to be located in the same plane extending in a direction substantially perpendicular to the winding radial direction of the first coil spring portion.

  In this case, when the fall prevention device of the present invention is brought into contact with the hexagon nut attached to the bolt, substantially the center of the hexagonal side of the hexagon nut at the position where the hinge stress is eliminated at the third top of the third coil spring portion. The part can be provided with an extension so that it is stable and does not generate rotational torque that goes over the corner of the hex nut.

  In addition, the fall prevention device of the present invention extends from the extension coil wire, and has a winding range of a size that can contact the side surface of the nut, and is concentric with the third coil spring portion, and A configuration including a fourth coil spring portion having a fourth coil element wire wound in a polygonal shape in which a plurality of top portions are arranged at substantially the same distance from the winding center of the third coil spring portion; can do.

  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, the second coil spring portion and the third coil spring portion may have a winding center of the second coil spring portion and a winding center of the third coil spring portion between the top portions. It may be configured to have a curved portion that is convexly bent in the opposite direction.

In this case, even if the first coil spring portion expands in diameter and hits the third coil spring portion, the applied force can be dispersed.
In addition, since the top portion can be arranged on the inner side than when there is no curved portion between the top portions, it is easy to store the fall prevention device of the present invention in a general tool, for example, a socket tool, so that a general socket tool can be used. It is easy to use, and the number of places where the bolt is suppressed can be increased as compared with the case where there is no curved portion between the tops.

Moreover, in the fall prevention device of the present invention, the fourth coil element wire of the fourth coil spring portion may be configured to be wound in a substantially hexagonal shape.
In this case, the fourth coil element wire can be firmly brought into contact with the side surface of the frequently used hexagon nut.

  The fall prevention device according to the present invention can prevent the nut attached to the bolt from loosening.

It is the schematic which shows an example of the fall prevention tool to which this invention is applied. It is the schematic plan view which omitted the 2nd coil spring part of the fall prevention tool to which this invention was applied. It is the schematic which shows an example of the state which attached the fall prevention tool to which this invention was applied to the bolt with which the nut was mounted. It is the schematic which shows an example of the state which attached the fall prevention tool of another aspect to which this invention was applied to the bolt with which the nut was attached. It is the schematic which shows the conventional locking device.

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 view showing an example of a fall prevention device to which the present invention is applied.
FIG. 2 is a schematic plan view of the stopper device to which the present invention is applied, omitting a second coil spring portion. That is, although the drop-off preventing device of the present invention naturally has the second coil spring portion, the illustration of the second coil spring portion is simply omitted in FIG. 2 for convenience.

The drop prevention device 1 of the present invention shown in FIG. 1 includes a first coil spring portion 2.
Here, the first 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 first coil spring portion 2 is slightly smaller than the outer diameter of the leg portion of the bolt.

Further, the fall prevention device 1 of the present invention includes the second coil spring portion 3.
Here, the second coil spring portion 3 has a second coil wire 3A.
The second coil wire 3 </ b> A extends from one end of the first coil wire 2 </ b> A of the first coil spring portion 2 and has a winding range larger than the winding range of the first coil spring portion 2. And wound concentrically with the first coil spring portion 2 and in a substantially triangular shape in which the three top portions 3B are arranged at substantially the same distance from the winding center 9 of the first coil spring portion 2. Has been turned.

Further, the fall prevention device 1 of the present invention includes a third coil spring portion 4.
Here, the third coil spring portion 4 has a third coil strand 4A.
Further, the third coil wire 4A extends from the other end of the first coil wire 2A of the first coil spring portion 2, and has a winding range larger than the winding range of the first coil spring portion 2. The first coil spring 2 has a shape in which the three apexes (4B to 4D) are arranged at substantially the same distance from the winding center 9 of the first coil spring 2 in a concentric manner with the first coil spring 2. It is wound in a substantially triangular shape.

  Also, in the third coil spring portion 4, the inner angle β of the third top portion 4D counted from the connection point of the first coil spring portion 2 with the other end of the first coil strand 2A is the other top portion, that is, the first top portion 4D. The inner angle α of the first apex 4B and the inner angle α of the second apex 4C are larger than the connection angle with the other end of the coil wire 2A.

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 element wire 5A extends in the same direction as the direction substantially perpendicular to the winding radial direction of the first coil spring part 2 from the third coil element wire 4A of the third coil spring part 4, and The second coil spring portion 3 extends in a direction opposite to the position of the coil spring portion 3 and can contact the side surface of the nut.

  The third coil wire 4A extending from the top 4D of the third coil spring portion 4, which is third from the connection point of the first coil spring portion 2 with the other end of the first coil wire 2A, is substantially formed. It has a linear shape.

  Further, a connection point between the third coil wire 4A of the third coil spring portion 4 and the other end of the first coil wire 2A of the first coil spring portion 2, and a winding center of the first coil spring portion 2 The extension 9 and the extension 5 are located in the same plane 10 extending in a direction substantially perpendicular to the winding radial direction of the first coil spring 2.

  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 a center position where there is no entity, and “plane” means a plane where there is no entity.

Further, the fall prevention device 1 of the present invention includes a fourth coil spring portion 6.
Here, the fourth coil spring portion 6 has a fourth coil wire 6A.
The fourth coil wire 6A extends from the extension coil wire 5A, and has a winding range large enough to contact the side surface of the nut, and is concentric with the third coil spring portion 4. The six top portions 6B are wound in a substantially hexagonal shape, which is a shape arranged at substantially the same distance from the winding center 9 of the third coil spring portion 4.

In addition, the second coil spring portion 3 has a curved portion 7 between the top 3B and the top 3B, which is bent in a direction opposite to the winding center of the second coil spring 3.
In addition, the third coil spring portion 4 also has a winding center of the third coil spring portion 4 between the first top portion 4B and the second top portion 4C or between the second top portion 4C and the third top portion 4D. Has a curved portion 7 that is bent in a convex shape in the opposite direction.
The inner angle of the curved portion 7 is larger than the inner angle of the top 3B of the second coil spring portion 3 and the inner angle of the top (4B, 4C, 4D) of the third coil spring portion 4.

The center axis 8 shown in FIG. 1 includes a winding center 9 of the first coil spring section 2, a winding center 9 of the second coil spring section 3, and a winding center 9 of the third coil spring section 4. This is an intangible linear axis that passes through the winding center 9 of the fourth coil spring portion 6 and extends in a direction substantially perpendicular to the winding radial direction of the first coil spring portion 2.
Further, the “winding range” referred to in this specification means a range in a direction substantially orthogonal to the central axis.

  In addition, the winding center 9 of the first coil spring section 2, the winding center 9 of the second coil spring section 3, the winding center 9 of the third coil spring section 4, and the winding center of the fourth coil spring section 6. The centers 9 are located at different positions on the center axis 8.

  That is, the first coil wire 2A, the second coil wire 3A, the third coil wire 4A, and the fourth coil wire 6A are concentrically wound around the center axis 8. It is shown that it is.

  In the drop-off preventing device of the present invention, the second coil element wire of the second coil spring portion does not necessarily have to be wound in a substantially triangular shape, and may be wound in, for example, a substantially hexagonal shape.

Further, in the fall-off preventing device of the present invention, the third coil extending from the top of the third coil spring portion, which is necessarily counted from the connection point of the first coil spring portion with the other end of the first coil wire. The strand does not have to have a substantially linear shape.
Further, in the drop-off preventing device of the present invention, the connection between the third coil wire of the third coil spring portion and the other end of the first coil wire of the first coil spring portion, and the first coil spring portion The winding center and the extension part of the first coil spring part need not be located in the same plane extending in a direction substantially perpendicular to the winding radial direction of the first coil spring part.

  However, if the fall prevention device of the present invention has such a configuration, when the fall prevention device of the present invention is brought into contact with the hexagon nut attached to the bolt, a hinge is attached to the third top of the third coil spring portion. It is preferable because the extension part can be located at the approximate center of the hexagonal side of the hexagonal nut where the stress is eliminated, and is stable because it does not generate rotational torque that goes over the corner of the hexagonal nut.

  Further, the second coil spring portion and the third coil spring portion are not necessarily formed between the top portions in a direction opposite to the winding center of the second coil spring portion and the winding center of the third coil spring portion. It is not necessary to have a curved part.

However, if the second coil spring portion and the third coil spring portion have a curved portion, even if the first coil spring portion expands in diameter and hits the third coil spring portion, the applied force can be dispersed. It is preferred.
In addition, if the second coil spring portion and the third coil spring portion have a curved portion, the top portion can be arranged on the inner side as compared with a case where there is no curved portion between the top portions. For example, it is easy to put the fall-prevention device of the present invention in a socket tool, so that a general socket tool can be easily used.Moreover, it is necessary to increase the number of places where bolts are suppressed compared to a case where there is no curved portion between the tops. Is preferred.

In the drop-off preventing device of the present invention, the fourth coil element wire of the fourth coil spring portion 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, if the fourth coil wire of the fourth coil spring portion is wound in a substantially hexagonal shape, the fourth coil wire can be firmly brought into contact with the side surface of the frequently used hexagon nut. preferable.

  Next, a method of attaching the fall prevention device 1 of the present invention to the leg 21B and the nut 22 of the bolt 21 having the thread groove 21C and the thread 21D will be described.

FIG. 3 is a schematic view showing an example of a state in which a fall prevention device to which the present invention is applied is mounted on a bolt on which a nut is mounted.
In FIG. 3, illustration of the fixed object is omitted. The bolt 21 has a head 21A, and the legs 21B extend from the head 21A.

The first coil spring portion 2 of the fall prevention device 1 of the present invention is pressed against the leg portion 21B of the bolt 21, and, for example, a socket wrench is put on the second coil spring portion 3 of the fall prevention device 1 of the present invention.
Then, the socket wrench is rotated to the right while being pressed, and is rotated to the right while pressing the fall prevention device 1 of the present invention, that is, in the direction of tightening the fall prevention device 1 of the present invention.

  The socket wrench and the drop prevention device 1 of the present invention are rotated clockwise while the socket wrench is placed on the second coil spring portion 3 of the drop prevention device 1 of the present invention, and the extension portion 5 and the fourth coil spring portion 6 are rotated. If the stopper 1 of the present invention stops rotating clockwise by contacting the side surface of the nut 22, the clockwise rotation is stopped.

  When the stopper 1 of the present invention stops rotating to the right, the socket wrench is removed from the stopper 1 of the present invention, and the state shown in FIG. 3 is obtained.

  At this time, since the third coil spring portion 4 having the third coil element wire 4A wound in a substantially triangular shape is in contact with the upper surface of the nut 22, the nut 22 rotates counterclockwise, that is, in a direction in which the nut 22 is loosened. The force which suppresses the rotation of is generated.

Further, even if the nut 22 attempts to rotate in the loosening direction, the corner of the nut 22 hits the extension 5, and the rotation of the nut 22 in the further loosening direction can be suppressed.
Further, since the top portion 6B of the fourth coil spring portion 6 is in contact with the corner portion of the nut 22, the rotation of the nut 22 in the loosening direction can be further suppressed.

  FIG. 4 is a schematic view showing an example of a state in which a fall prevention device of another embodiment to which the present invention is applied is mounted on a bolt having a nut mounted thereon.

  The point that the fall prevention device 31 of the other embodiment of the present invention shown in FIG. 4 does not include the fourth coil spring portion 6 and the extension that the extension portion 5 of the fall prevention device 1 of the present invention shown in FIGS. 4 in that the length of the extended coil wire 5A of the extension 5 of the fall-off preventing device 31 of the present invention shown in FIG. 4 is longer than the length of the coil wire 5A. The stopper 31 is different from the stopper 1 of the present invention shown in FIGS.

  That is, the fall prevention device 31 of the present invention shown in FIG. 4 also includes the first coil spring portion 2, the second coil spring portion 3, and the third coil spring portion 4.

  Also, in the third coil spring portion 4 of the drop-off preventing device 31 of the present invention shown in FIG. 4, although not shown, the connection between the first coil spring portion 2 and the other end of the first coil strand 2A is not shown. The interior angle of the third top is counted larger than the interior angle of each of the first top and the second top counted from the other top, that is, the connection point with the other end of the first coil strand 2A.

  Further, in the stopper 31 of the present invention shown in FIG. 4, the third third coil spring portion 4 counted from the connection point of the first coil spring portion 2 with the other end of the first coil strand 2A is also provided. Has a substantially straight shape.

  In addition, in the stopper 31 of the present invention shown in FIG. 4, the third coil wire 4A of the third coil spring portion 4 and the other end of the first coil wire 2A of the first coil spring portion 2 are also connected. The connection portion, the winding center of the first coil spring portion 2, and the extension portion 5 are located in the same plane extending in a direction substantially orthogonal to the winding radial direction of the first coil spring portion 2. .

  Further, the drop-off preventing device 31 of the present invention shown in FIG. 4 can be attached to a bolt with a nut in the same manner as the drop-off preventing device 1 of the present invention shown in FIG.

  As described above, the fall prevention device of the present invention includes the extension portion, and the extension portion is substantially arranged from the third coil strand of the third coil spring portion to the winding radial direction of the first coil spring portion. Since the extension coil wire extends in the same direction as the orthogonal direction and in the opposite direction to the position of the second coil spring portion and can contact the side surface of the nut, the nut will rotate in the loosening direction. Even so, it is possible to suppress the rotation of the nut in a direction in which the corner of the nut hits the extension and further loosens.

  Further, the fall prevention device of the present invention includes a third coil spring portion, and the third coil spring portion extends from the other end of the first coil element wire of the first coil spring portion, and And the three apexes are arranged at substantially the same distance from the winding center of the first coil spring portion in a winding range larger than the winding range of the coil spring portion, and concentrically with the first coil spring portion. A third coil wire wound in a substantially triangular shape having a bent shape, and a third top portion counted from a connection point of the first coil spring portion with the other end of the first coil wire. Is larger than the inner angle of the other apex, the extension can move the third apex of the third coil spring portion as a hinge, so that when the fall prevention device of the present invention rotates in the direction of attaching to the nut. Allows the extension to go beyond the corner of the nut During rotation of the drop-off prevention device of the present invention in a direction removed from the nut can be suppressed from exceeding the extension of the corners of the nut.

  Further, since the third coil spring portion can abut on the upper surface of the nut, left rotation of the nut, that is, rotation in the direction in which the nut is loosened, can be suppressed.

Therefore, the fall prevention device of the present invention can prevent the nut attached to the bolt from loosening.
As a result, the nut does not vibrate, and there is no fear that the thread of the bolt is crushed by the vibration of the nut.

DESCRIPTION OF SYMBOLS 1 Fall prevention tool 2 1st coil spring part 2A 1st coil wire 3 2nd coil spring part 3A 2nd coil wire 3B Top 4 3rd coil spring part 4A 3rd coil wire 4B 1st top 4C 2nd top 4D 3rd top 5 Extension 5A Extension coil wire 6 Fourth coil spring 6A Fourth coil wire 6B Top 7 Curved portion 8 Center axis 9 Center of winding 10 Flat 21 Bolt 21A Head 21B Leg 21C Thread 21D Screw 22 Nut 31

Claims (5)

A first coil spring portion having a first coil wire wound in a substantially circular shape with substantially the same diameter;
The first coil spring portion extends from one end of the first coil wire, has a winding range larger than the winding range of the first coil spring portion, and is concentric with the first coil spring portion. And a second coil wire wound in a polygonal shape having a plurality of apexes arranged at substantially the same distance from the winding center of the first coil spring portion. A coil spring part,
The first coil spring portion extends from the other end of the first coil strand, and has a winding range larger than the winding range of the first coil spring portion, and A third coil wire wound concentrically and in a substantially triangular shape having three apexes arranged at substantially the same distance from the winding center of the first coil spring portion; And a third coil spring portion in which the third inner angle of the top portion, which is counted from a connection point of the first coil spring portion with the other end of the first coil wire, is larger than the inner angle of the other top portion,
What is the position of the second coil spring portion in the same direction as the direction substantially orthogonal to the winding radial direction of the first coil spring portion from the third coil element wire of the third coil spring portion? An extension portion extending in the opposite direction and having an extension coil element wire capable of contacting a side surface of the nut. The third coil wire extending from the top of the third coil spring portion, which is counted from the connection point of the first coil spring portion with the other end of the first coil wire, is substantially linear. Has,
A connection point between the third coil wire of the third coil spring portion and the other end of the first coil wire of the first coil spring portion, a winding center of the first coil spring portion, The fall-off prevention device according to claim 1, wherein the extension portion is located in the same plane extending in a direction substantially perpendicular to a winding radial direction of the first coil spring portion. The third coil spring portion extends from the extension coil element wire and has a winding range large enough to be able to contact the side surface of the nut. 3. A fourth 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 coil spring portion. 4. Fall prevention device. The second coil spring portion and the third coil spring portion are in a direction opposite to the winding center of the second coil spring portion and the winding center of the third coil spring portion between the top portions. The fall prevention device according to claim 1, having a bent portion bent in a convex shape. The fall prevention device according to claim 3, wherein the fourth coil wire of the fourth coil spring portion is wound in a substantially hexagonal shape.

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