WO2017110852A1

WO2017110852A1 - Falling-off prevention tool

Info

Publication number: WO2017110852A1
Application number: PCT/JP2016/088054
Authority: WO
Inventors: 真弓添田
Original assignee: 有限会社Ｓｉｔ
Priority date: 2015-12-22
Filing date: 2016-12-21
Publication date: 2017-06-29
Also published as: JP6179926B2; JP2017115939A

Abstract

This falling-off prevention tool (1) is provided with a coil spring part (2) in which a coil wire (2A) is wound, and a protruding part (3). In the protruding part (3), an extension coil wire (3A) extending from one end of the coil wire (2A) constituting a part of the coil spring part (2) is wound in a substantially triangular shape so as to be coaxial with the coil spring part (2) and so that the winding range is greater than the winding range of the coil spring part (2). The protruding part (3) has an end region (3B), which is a region in a predetermined range from the tip of the extension coil wire (3A) set away from the one end of the coil wire (2A), the end region (3B) being located on the side set away from the coil spring part (2) in the same direction as that in which the winding center of the coil spring part (2) extends.

Description

Fall-off prevention device

The present invention relates to a drop-off prevention device. Specifically, the present invention relates to a drop-off prevention tool that prevents the fixed object and nut from falling off the bolt.

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

In addition, fixing by welding requires welding equipment, and it takes time and labor for construction. Also, equipment is required for releasing the fixing, and it takes time and effort to release the fixing. Many methods are adopted.

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

For example, Patent Literature 1 describes a nut 401 with a locking function as shown in FIG.
That is, the nut 401 with a locking function described in Patent Document 1 includes a locking tool 403 and a hex nut 102.

The loosening stop 403 includes a loosening coil portion 103A around which a metal wire is wound with substantially the same diameter, and the outer edge of the hexagon nut 102 that extends outward in a tangential direction from the lower end of the loosening coil portion 103A. And an automatic tightening adjustment unit 410 composed of a drawn metal wire.

Further, the loose fastener 403 is bent downward from the upper end of the loose coil portion 103A, is an annular narrow groove, and is a nut that can be engaged with the loose fastener engaging portion 430 formed on the upper surface of the hexagon nut 102. An engaging portion 420 is provided.

Moreover, the nut engaging part 420 is comprised by the part 103B wound larger than the diameter of the loosening coil part 103A, and the part 103C engaged with the hexagon nut 102.

JP 2011-231904 A

However, although the locking device described in Patent Document 1 has an automatic tightening adjustment portion as a straight portion, the automatic tightening adjustment portion is not configured to be fitted into the screw groove of the bolt. There was a problem that it was difficult to attach the tool to the bolt.

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

In order to achieve the above-described object, the drop-off prevention device of the present invention includes a coil spring portion in which a coil wire is wound in a substantially circular shape with substantially the same diameter, and one end of the coil wire constituting the coil spring portion. The extending extension coil wire has a winding range larger than the winding range of the coil spring portion, is concentric with the coil spring portion, and a plurality of top portions are substantially the same distance from the winding center of the coil spring portion. The tip of the extended coil wire that is wound in a polygonal shape that is a shape arranged in a straight line extending in a tangential direction of the coil spring portion and that is separated from one end of the coil wire And a projecting portion having an end region disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends.

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

Further, the extension coil wire extending from one end of the coil wire constituting the coil spring portion is in a winding range larger than the winding range of the coil spring portion, concentric with the coil spring portion, and a plurality of top portions are coil spring portions. At least one of the extended coil strands by an overhanging portion that is wound in a polygonal shape, which is a shape that is disposed at substantially the same distance from the winding center of the wire, and that extends substantially linearly in the tangential direction of the coil spring portion. Three straight portions can be fitted into the screw grooves of the bolt.

Also, the end region disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends is a region within a predetermined range from the tip of the extension coil strand separated from one end of the coil wire. Since the overhanging portion is not formed so as to surround the coil spring portion, it is easy to fit at least three straight portions of the extension coil wire into the screw groove of the bolt.

Also, the end region disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends is a region within a predetermined range from the tip of the extension coil strand separated from one end of the coil wire. When the overhanging portion is arranged on the nut side by the overhanging portion, the end region pressed against the nut is pushed outside the winding range of the overhanging portion, that is, away from the winding center, and the user Can visually confirm the effect of preventing dropout.

Also, in the dropout prevention device of the present invention, the end region can be curved outside the winding range of the coil spring portion and protruding into the winding range of the overhang portion.

In this case, the end region pressed against the nut is pushed outside the winding range of the overhanging portion, and further, the protruding end region hits the region other than the end region of the overhanging portion and goes outward. Extruded. Then, a force to return to the end region is generated as much as the end region hits and is pushed out, and a contraction force can be applied to the drop-off prevention device.

Furthermore, in the dropout prevention tool of the present invention, the overhanging portion can be formed by winding the extension coil wire in a substantially triangular shape.

In this case, the three straight portions of the extension coil can be fitted into the bolt groove.

Further, the drop-off prevention device of the present invention is such that the extension coil strand extending from the other end of the coil strand constituting the coil spring portion is in a winding range larger than the winding range of the coil spring portion and concentrically with the coil spring portion. In addition, a plurality of top portions are wound in a polygonal shape, which is a shape that is arranged at substantially the same distance from the winding center of the coil spring portion, and extending substantially linearly in the tangential direction of the coil spring portion, And the additional end which is the area | region of the predetermined range from the front-end | tip of the extension coil strand away from the other end of the coil strand, and is arrange | positioned on the side away from a coil spring part in the same direction as the direction where the winding center of a coil spring part is extended. It may be provided with an additional overhang having a partial area.

Here, the extension coil strand extending from the other end of the coil strand constituting the coil spring portion is in a winding range larger than the winding range of the coil spring portion, concentrically with the coil spring portion, and a plurality of top portions are coil springs. By the additional overhanging portion wound in a polygonal shape, which is a shape arranged at substantially the same distance from the winding center of the portion, and extending substantially linearly in the tangential direction of the coil spring portion, the user can It is easy to rotate the drop-off prevention tool by grasping the additional overhanging part by hand or general-purpose tool.

Further, the additional end is a region within a predetermined range from the tip of the extension coil wire separated from the other end of the coil wire, and is disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends. When the additional overhanging portion having a region is arranged on the nut side, the additional end region pressed against the nut is outside the winding range of the additional overhanging portion, that is, the side away from the winding center. The user can visually confirm the effect of preventing the dropout.
In other words, even if the fall prevention tool is attached to the bolt from the overhanging part side, or the fall prevention tool is attached to the bolt from the additional overhanging part side, the user can visually confirm the effect of the fall prevention. it can.

In the dropout prevention device of the present invention, the extension coil wire is wound in a substantially triangular shape, and the additional extension portion is formed by winding the extension coil wire in a substantially triangular shape. It can be.

In this case, the user can easily fit the straight part into the screw groove regardless of whether the extension part or the additional extension part is attached to the bolt. Can be attached to.

Also, in the dropout prevention device of the present invention, the end region can be colored in a color different from the color of other regions.

In this case, it is easier for the user to visually confirm the effect of preventing the dropout.

Further, in the dropout prevention device of the present invention, the top portion of the overhanging portion is disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends from the substantially linear region of the overhanging portion. Can be.

In this case, the top portion sufficiently hits the inclined boundary region of the nut, and the force for suppressing the left rotation of the nut can be improved.

The drop-off prevention tool according to the present invention can be easily attached to the bolt.

It is the schematic which shows 1st Embodiment of the drop-off prevention tool to which this invention is applied. It is a schematic plan view of the drop-off prevention tool of the present invention shown in FIG. It is a schematic plan view which shows the state which mounted | wore the bolt and nut with the drop-off prevention tool of this invention shown in FIG. It is a schematic plan view which shows 2nd Embodiment of the drop-off prevention tool to which this invention is applied. It is a schematic plan view which shows the state which mounted | wore the bolt and nut with the drop-off prevention tool of this invention shown in FIG. It is a general | schematic fragmentary enlarged view which shows the modification of the drop-off prevention tool of 2nd Embodiment to which this invention is applied. It is a schematic plan view which shows the state which mounted | wore the bolt and nut with the drop-off prevention tool of 3rd Embodiment to which this invention is applied. It is the schematic which shows 4th Embodiment of the drop-off prevention tool to which this invention is applied. It is a schematic plan view which shows the state which mounted | wore the bolt and nut with the drop-off prevention tool of 4th Embodiment to which this invention is applied. It is the schematic which shows the conventional slow stop tool.

Hereinafter, embodiments of the present invention will be described with reference to the drawings to facilitate understanding of the present invention.
FIG. 1 is a schematic view showing a first embodiment of a drop-off prevention device to which the present invention is applied. FIG. 2 is a schematic plan view of the dropout prevention tool of the present invention shown in FIG.

A dropout prevention device 1 according to the first embodiment of the present invention shown in FIG. 1 includes a coil spring portion 2 in which a coil wire 2A is wound in a substantially circular shape with substantially the same diameter.
Here, the diameter of the coil spring portion 2 is slightly smaller than the outer diameter of the leg portion of the bolt.

Further, the dropout prevention device 1 of the present invention includes an overhang portion 3.
Here, the overhang portion 3 has an extension coil strand 3A extending from one end of the coil strand 2A constituting the coil spring portion 2 in a winding range larger than the winding range of the coil spring portion 2, and the coil spring portion 2 The three top portions 3C are concentrically wound in a substantially triangular shape, which is a shape that is disposed at substantially the same distance from the winding center of the coil spring portion 2.

The overhang portion 3 is formed by winding an extended coil element wire 3 A extending in a substantially straight line in the tangential direction outside the coil spring portion 2.
That is, the substantially linear portion of the overhang portion 3 is located outside the outer diameter of the coil spring portion 2 and can invite the fitting of the drop prevention tool 1 of the present invention to the leg portion of the bolt. .

The overhang portion 3 is a region within a predetermined range from the tip of the extended coil strand 3A that is separated from one end of the coil strand 2A, and the coil spring portion 2 in the same direction as the direction in which the winding center of the coil spring portion 2 extends. End region 3B arranged on the side away from the center.

In the present specification, “disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends” means that, for example, as shown in FIG. When viewed from the part 2 side in the same direction as the direction in which the winding center of the coil spring part 2 extends, it means that the coil spring part 2 is disposed on the other side of the other region of the extension coil strand 3A.

Further, the end region 3B is colored in a color different from the colors of other regions, that is, the other regions of the extension coil strand 3A and the region of the coil strand 2A, for example, red, green, or yellow.

FIG. 3 is a schematic plan view showing a state in which the dropout prevention device of the present invention shown in FIG. 1 is attached to a bolt and a nut. In addition, illustration of a to-be-fixed object is abbreviate | omitted in FIG.
When the drop prevention tool 1 of the present invention is attached to the leg portion of the bolt 4 in which the thread groove is formed, the overhang portion 3 is directed to the leg portion of the bolt 4 and the drop prevention tool 1 of the present invention is attached to the bolt 4. Rotate clockwise while pressing against the leg.

At this time, three linear portions of the extension coil strand 3 A constituting the overhang portion 3 are fitted into screw grooves (not shown) of the bolt 4.
Further, the coil wire 2 A located on the projecting portion 3 side of the coil spring portion 2 abuts on the end portion of the leg portion of the bolt 4.

Further, if the clockwise rotation of the drop-off prevention device 1 of the present invention is continued, the coil spring portion 2 is guided, and the coil wire 2A of the coil spring portion 2 is also fitted into the thread groove of the bolt 4, so that quick insertion and mounting are possible. it can.

Then, when the end region 3B is pressed against the nut 5 while continuing the clockwise rotation of the drop-off preventing device 1 of the present invention, the colored end region 3B is formed on the overhang portion 3 as shown in FIG. It is pushed out to the outside of the winding range, that is, the side away from the winding center of the overhang portion 3, and is easily confirmed from the outside.
As a result, the user can know that the drop-off prevention tool 1 of the present invention is firmly pressed against the nut 5, and can visually confirm the effect of the drop-off prevention.

Moreover, the overhang | projection part 3 hits the end surface of the nut 5, ie, the surface shown in FIG. 3, and the force which suppresses the left rotation of the nut 5 generate | occur | produces. In addition, there is always a reaction due to the spring effect.
Further, since the end region 3B is pushed out to the side away from the winding center of the overhanging portion 3, the end region 3B tends to return to the original position, and thus a tightening force to the bolt 4 is generated.

FIG. 4 is a schematic plan view showing a second embodiment of a drop-off prevention device to which the present invention is applied.
In FIGS. 4 and 5 showing the second embodiment, the same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.

The dropout prevention tool 11 according to the second embodiment of the present invention shown in FIG.
Here, the overhang portion 13 has a winding range in which the extension coil strand 13A extending from one end of the coil strand 2A constituting the coil spring portion 2 is larger than the winding range of the coil spring portion 2, and the coil spring portion 2 The three top portions 13C are concentrically wound and formed in a substantially triangular shape, which is a shape that is disposed at substantially the same distance from the winding center of the coil spring portion 2.

Further, the overhanging portion 13 is configured by winding the extended coil element wire 13 A so as to extend substantially linearly in the tangential direction outside the coil spring portion 2.

The overhanging portion 13 is a region in a predetermined range from the tip of the extended coil strand 13A that is separated from one end of the coil strand 2A, and the coil spring portion 2 is in the same direction as the direction in which the winding center of the coil spring portion 2 extends. And an end region 13B disposed on the side away from the center.

Further, as shown in FIG. 4, the end region 13 B is outside the winding range of the coil spring portion 2 and is curved to protrude into the winding range of the overhang portion 13.

Further, the end region 13B is colored in a color different from the colors of the other regions, that is, the other region of the extended coil wire 13A and the region of the coil wire 2A.

FIG. 5 is a schematic plan view showing a state in which the dropout prevention device of the present invention shown in FIG. 4 is attached to a bolt and a nut. In addition, illustration of the to-be-fixed object is abbreviate | omitted in FIG.

Similarly to the drop-off prevention tool 1 according to the first embodiment of the present invention, the drop-off prevention tool 11 according to the second embodiment of the present invention attaches the overhanging portion 13 to the bolt 4 when the bolt 4 is attached to the leg portion. The drop prevention tool 11 of the present invention is rotated rightward while pressing against the leg of the bolt 4 toward the leg.

At this time, three linear portions of the extension coil element wire 13 A constituting the overhang portion 13 are fitted into screw grooves (not shown) of the bolt 4.
Further, the coil wire 2 A located on the overhanging portion 13 side of the coil spring portion 2 comes into contact with the end portion of the leg portion of the bolt 4.

When the end region 13B is pressed against the nut 5 while continuing the clockwise rotation of the drop-off preventing tool 11 of the present invention, the colored end region 13B is wound on the overhanging portion 13 as shown in FIG. It is pushed out to the outside of the turning range, that is, the side away from the winding center of the overhanging portion 13, and is easily confirmed from the outside.
As a result, the user can know that the drop-off prevention tool 11 of the present invention is firmly pressed against the nut 5, and can visually confirm the effect of the drop-off prevention.

Furthermore, in the drop-off prevention device 11 of the second embodiment of the present invention, the end region 13B is curved outside the winding range of the coil spring portion 2 and protruding into the winding range of the overhang portion 13. Therefore, the projected and curved end region 13B hits a region other than the end region of the overhang 13 and is pushed outward.
Then, as the end region 13B hits the region other than the end region of the overhang portion 13 and is further pushed out, a force to return to the end region 13B is generated, and the fall prevention tool 11 of the present invention is contracted. Can give power.

Moreover, by changing the magnitude of the curvature of the curved end region 13B, it occurs in the end region 13B when the end region 13B hits a region other than the end region of the overhanging portion 13 and is further pushed out. , You can change the magnitude of the force to return.

FIG. 6 is a schematic partially enlarged view showing a modified example of the dropout prevention tool of the second embodiment to which the present invention is applied.
As shown in FIG. 6, the fixed regions on both sides centered on the top portion 13 C are provided with the inclined portions 13 D, so that the coil spring portion 2 has a larger area than the other regions, i. It is located on the side away from the coil spring portion 2 in the same direction as the direction in which the winding center extends.
That is, certain regions on both sides centering on the top portion 13C are inclined downward in FIG.

Further, by configuring the constant regions on both sides centering on each of the three top portions 13C as described above, this constant region sufficiently hits the nut, and the force for suppressing the left rotation of the nut can be improved.

That is, generally, the boundary region where the end surface of the nut and the side surface substantially orthogonal to the end surface of the nut are in contact with each other is a fixed region on both sides centered on the top portion 13C as shown in FIG. By positioning on the side away from the coil spring part 2 in the same direction as the direction in which the winding center of the coil spring part 2 extends rather than the substantially linear area of the line 13A, the constant areas on both sides centering on the top part 13C are It is possible to improve the force that sufficiently hits the inclined boundary region of the nut and suppresses the left rotation of the nut.
In the drawings, the inclination of the boundary region of the nut is not shown.

FIG. 7 is a schematic plan view showing a state in which the dropout prevention tool of the third embodiment to which the present invention is applied is mounted on a bolt and a nut.
In FIG. 7 showing the third embodiment, the same members as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment.
Further, in FIG. 7, the illustration of the fixed object is omitted.

A dropout prevention tool 21 according to the third embodiment of the present invention shown in FIG.
Here, the overhang portion 23 has an extension coil strand 23A extending from one end of the coil strand 2A constituting the coil spring portion 2 in a winding range larger than the winding range of the coil spring portion 2, and the coil spring portion 2 The three top portions 23C are concentrically wound in a substantially triangular shape that is disposed at substantially the same distance from the winding center of the coil spring portion 2, and further, another top portion 23C is formed. It is configured to be wound.

Further, the overhang portion 23 is configured by extending the extended coil wire 23 A so as to extend substantially linearly in the tangential direction outside the coil spring portion 2 at two locations.

Further, the overhang portion 23 is a region in a predetermined range from the tip of the extended coil strand 23A that is separated from one end of the coil strand 2A, and is in the same direction as the direction in which the winding center of the coil spring portion 2 extends. End portion 23B disposed on the side away from the center.

Further, the end region 23B is colored in a color different from the colors of the other regions, that is, the other region of the extension coil wire 23A and the region of the coil wire 2A.

Similarly to the dropout prevention device 1 of the first embodiment of the present invention, the dropout prevention device 21 of the third embodiment of the present invention is attached to the leg portion of the bolt 4, and the overhang portion 23 is attached to the bolt 4. The drop prevention tool 21 of the present invention is rotated to the right while being pressed against the leg of the bolt 4 toward the leg.

At this time, two linear portions of the extension coil strand 23 A constituting the overhang portion 23 are fitted into a screw groove (not shown) of the bolt 4.
Further, the coil wire 2 A located on the overhanging portion 23 side of the coil spring portion 2 comes into contact with the end portion of the leg portion of the bolt 4.

When the end region 23B is pressed against the nut 5 while continuing the clockwise rotation of the drop-off preventing device 21 of the present invention, the colored end region 23B is wound on the overhang portion 23 as shown in FIG. It is pushed out of the winding range from the one end of the coil wire 2A to the third top 23C in the winding range, that is, the side away from the winding center of the overhang 23, and is easily confirmed from the outside.
As a result, the user can know that the drop-off prevention tool 21 of the present invention is firmly pressed against the nut 5, and can visually confirm the effect of the drop-off prevention.

FIG. 8 is a schematic view showing a fourth embodiment of a drop-off prevention device to which the present invention is applied.
A dropout prevention tool 31 according to the fourth embodiment of the present invention shown in FIG. 8 includes a coil spring portion 2 in which a coil wire 2A is wound in a substantially circular shape with substantially the same diameter.
Here, the diameter of the coil spring portion 2 is slightly smaller than the outer diameter of the leg portion of the bolt.

Further, the dropout prevention tool 31 of the present invention includes the overhang portion 3 and the additional overhang portion 34.
Here, the overhang portion 3 has an extension coil strand 3A extending from one end of the coil strand 2A constituting the coil spring portion 2 in a winding range larger than the winding range of the coil spring portion 2, and the coil spring portion 2 The three top portions 3C are concentrically wound in a substantially triangular shape, which is a shape that is disposed at substantially the same distance from the winding center of the coil spring portion 2.

Further, the overhang portion 3 is configured by winding the extended coil element wire 3 A so as to extend substantially linearly in the tangential direction outside the coil spring portion 2.

The overhang portion 3 is a predetermined region from the tip of the extended coil strand 3A that is separated from one end of the coil strand 2A, and is separated from the coil spring portion 2 in the same direction as the direction in which the winding center of the coil spring portion 2 extends. It has an end region 3B arranged on the side.

Further, the end region 3B is colored in a color different from the colors of the other regions, that is, the other region of the extension coil strand 3A and the region of the coil strand 2A.

Further, the additional overhang portion 34 has an extension coil strand 34A extending from the other end of the coil strand 2A constituting the coil spring portion 2 in a winding range larger than the winding range of the coil spring portion 2, and the coil spring portion 2 The three top portions 34 C are wound in a substantially triangular shape, which is a shape arranged at substantially the same distance from the winding center of the coil spring portion 2.

Further, the additional overhang portion 34 is configured by winding an extended coil element wire 34 A extending substantially linearly in the tangential direction outside the coil spring portion 2.

Further, the additional overhang portion 34 is a coil spring in the same direction as the direction in which the winding center of the coil spring portion 2 extends and is a region within a predetermined range from the tip of the extended coil wire 34A that is separated from the other end of the coil strand 2A. It has an additional end region 34 B arranged on the side away from the part 2.

Further, unlike the end region 3B, the additional end region 34B is not colored.

In addition, when the drop prevention tool 31 of the present invention is attached to a leg portion in which a screw groove of a bolt is formed, the overhang portion 3 colored in the end region 3B is directed toward the leg portion of the bolt. Rotate clockwise while pressing the drop-off prevention tool 31 against the leg of the bolt.

Here, an uncolored additional end region and a colored end region are provided, the overhanging portion where the end region is colored is directed to the leg of the bolt, and the dropout prevention device of the present invention is attached to the bolt. The reason for attaching to the leg is as follows.

Thus, if the fall prevention device of the present invention is attached to the leg portion of the bolt, the fall prevention device of the present invention continues to rotate clockwise, and the colored end region is pressed against the nut and colored. The end region is pushed to the side away from the winding center of the overhanging portion, and it is easy to confirm from the outside. As a result, the user confirms that the fall-off prevention device of the present invention is firmly pressed against the nut. This is because it is easy to recognize.

In addition, when both the end region and the additional end region are colored, the colored region that is not pressed against the nut is also confirmed from the outside, and the user can prevent the falling of the present invention. This is because it becomes difficult to recognize that the tool is firmly pressed against the nut.

Moreover, since the overhang | projection part 3 and the additional overhang | projection part 34 are both comprised by winding the extension coil strand in the substantially triangular shape, the fall prevention tool 31 of the 4th Embodiment of this invention is a user. Since it is easy to fit the straight portion into the screw groove in the same way regardless of which of the overhanging portion 3 and the additional overhanging portion 34 is attached to the bolt, without worrying about the direction of the drop-off prevention device 31 of the present invention. Can be attached to bolts.

Further, the dropout prevention tool 31 of the fourth embodiment of the present invention includes the overhang portion 3 and the additional overhang portion 34 that are configured by winding the extension coil strands in a substantially triangular shape. A person can grab either one and apply rotation to the dropout prevention tool 31 of the present invention, and easily rotate the dropout prevention tool 31 of the present invention.

FIG. 9 is a schematic plan view showing a state in which the dropout prevention device of the fourth embodiment to which the present invention is applied is mounted on a bolt and a nut. In addition, illustration of the to-be-fixed object is abbreviate | omitted in FIG.

When the drop prevention tool 31 of the present invention is attached to the leg portion of the bolt 4 in which the thread groove is formed, the overhang portion 3 is directed to the leg portion of the bolt 4, and the drop prevention tool 31 of the present invention is attached to the bolt 4. Rotate clockwise while pressing against the leg.

Then, when the end region 3B is pressed against the nut 5 while continuing the right rotation of the drop-off prevention tool 31 of the present invention, the colored end region 3B is formed on the overhang portion 3 as shown in FIG. It is pushed away from the winding center and easily confirmed from the outside.
As a result, the user can know that the drop-off prevention tool 31 of the present invention is firmly pressed against the nut 5 and can visually confirm the effect of preventing the drop-off.

Moreover, the overhang | projection part 3 contacts the end surface of a nut, ie, the surface shown in FIG. 9, and the force which suppresses the left rotation of the nut 5 generate | occur | produces. In addition, there is always a reaction due to the spring effect.
Further, since the end region 3B is pushed out to the side away from the winding center of the overhanging portion 3, the end region 3B tends to return to the original position, and thus a tightening force to the bolt 4 is generated.

Although not shown, the drop prevention tool 31 according to the present invention is attached to the leg portion where the screw groove of the bolt 4 is formed, but the top portion 3C of the overhang portion 3 and the top portion 34C of the additional overhang portion 34 are not shown. Are arranged on substantially the same line in the same direction as the direction in which the winding center of the coil spring portion 2 extends.

On the other hand, after the drop prevention tool 31 of the present invention is attached to the leg portion where the screw groove of the bolt 4 is formed, as shown in FIG. 9, the top portion 3C of the overhang portion 3 and the top portion of the additional overhang portion 34 are provided. 34C is not disposed on the same line in the same direction as the direction in which the winding center of the coil spring portion 2 extends.

At this time, when the drop-off prevention tool 31 of the present invention is viewed from the side of the additional overhang portion 34 in the same direction as the direction in which the winding center of the coil spring portion 2 extends, it looks almost hexagonal as shown in FIG. The top 3C and the top 34C are visible.

That is, since the user can confirm not only the colored end region 3B but also the substantially hexagonal shape from the outside, it is easier to visually confirm the effect of preventing the dropout.

In addition, as long as the extension coil wire is wound in a polygonal shape, it does not necessarily have to be wound in a substantially triangular shape. For example, the extension coil wire may be wound in a substantially pentagonal shape or a substantially hexagonal shape.

However, if the extension coil wire is wound in a substantially triangular shape, the straight portion can be fitted into the screw groove of the bolt more stably than in the case of being wound in a substantially square shape or a substantially pentagonal shape. preferable.

In addition, the end region does not necessarily have to be colored in a color different from the color of other regions.
However, it is preferable that the end region is colored in a color different from the color of other regions because the user can more easily visually confirm the effect of preventing the dropout.

Also, the overhanging portion and the additional overhanging portion do not necessarily have the same shape. For example, the overhanging portion may have a substantially triangular shape, and the additional overhanging portion may have a substantially hexagonal shape.

However, if the overhanging part and the additional overhanging part have the same shape, the user can fit the straight part into the screw groove in the same way regardless of whether the overhanging part or the additional overhanging part is attached to the bolt. Since it is easy, there exists an advantage that it can mount | wear to a volt | bolt, without minding the direction of the drop-off prevention tool of this invention.

As described above, the drop-off prevention device of the present invention is such that the extension coil wire extending from one end of the coil wire constituting the coil spring portion has a winding range larger than the winding range of the coil spring portion and is concentric with the coil spring portion. And a plurality of top portions are wound in a polygonal shape, which is a shape arranged at substantially the same distance from the winding center of the coil spring portion, and extending in a substantially straight line in the tangential direction of the coil spring portion. Since the projecting portion is provided, at least three straight portions of the extension coil element wire can be fitted into the screw groove of the bolt.

In addition, the drop-off preventing device of the present invention is a region within a predetermined range from the tip of the extended coil wire separated from one end of the coil wire, and is separated from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends. A projecting portion having an end region disposed on the side, and since such a projecting portion is not formed so as to surround the coil spring portion, at least three straight portions of the extension coil element wire are screwed Easy to fit in the groove.

In addition, the drop-off preventing device of the present invention is a region within a predetermined range from the tip of the extended coil wire separated from one end of the coil wire, and is separated from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends. Since the overhanging portion having the end region arranged on the side is provided, when the overhanging portion is arranged on the nut side, the end region pressed against the nut is outside the winding range of the overhanging portion, that is, Extruded to the side away from the winding center, the user can visually confirm the effect of preventing the dropout.

Therefore, the drop-off prevention device of the present invention can be easily rotated with a hand or a general-purpose tool, and can be easily attached to the bolt.

Also, since the end region is colored in a color different from the color of other regions, the user can more easily visually confirm the effect of preventing the drop-off compared to the case where the end region is not colored.

DESCRIPTION OF SYMBOLS 1 Drop-off prevention tool 2 Coil spring part 2A Coil strand 3 Overhang | projection part 3A Extension coil strand 3B End area | region 3C Top part 4 Bolt 5 Nut 11 Fall-off prevention tool 13 Overhang | projection part 13A Extension coil element | wire 13B Curved end area | region 13C Top part 13D Inclined part 21 Fallout prevention tool 23 Overhang part 23A Extension coil element wire

23B End area

23C Top part 31 Fallout prevention tool 33 Overhang part 34 Additional overhang part 34A Extension coil element wire 34B Additional end part area 34C Additional top part

Claims

A coil spring portion in which a coil wire is wound in a substantially circular shape with substantially the same diameter;
The extension coil wire extending from one end of the coil wire constituting the coil spring portion has a winding range larger than the winding range of the coil spring portion, is concentric with the coil spring portion, and has a plurality of top portions. The coil spring portion is wound in a polygonal shape, which is a shape disposed at substantially the same distance from the winding center of the coil spring portion, extending in a substantially tangential direction of the coil spring portion, and the coil element An end region disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends, and is a region within a predetermined range from the tip of the extension coil strand separated from one end of the wire. A drop-off prevention device comprising an overhanging portion.
The dropout prevention tool according to claim 1, wherein the end region is curved outside the winding range of the coil spring portion and projecting into the winding range of the overhang portion.
The dropout prevention tool according to claim 1, wherein the extension coil strand is wound in a substantially triangular shape.
The extension coil wire extending from the other end of the coil wire constituting the coil spring portion has a winding range larger than the winding range of the coil spring portion, is concentric with the coil spring portion, and has a plurality of top portions. Are wound in a polygonal shape, which is a shape that is disposed at substantially the same distance from the winding center of the coil spring portion, and extends substantially linearly in the tangential direction of the coil spring portion, and the coil An additional end disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends and is in a predetermined range from the tip of the extension coil strand away from the other end of the strand The fall prevention tool according to claim 1, further comprising an additional overhang portion having a partial region.
In the overhang portion, the extension coil wire is wound in a substantially triangular shape,
The dropout prevention tool according to claim 4, wherein the extension coil element wire is wound in a substantially triangular shape.
The dropout prevention tool according to claim 1, wherein the end region is colored in a color different from the color of the other region.
The top portion of the overhang portion is disposed on the side away from the coil spring portion in the same direction as the direction in which the winding center of the coil spring portion extends from the substantially linear region of the overhang portion. Detachment prevention tool as described.