JP6215776B2 - Fall-off prevention device - Google Patents

Description

  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 effort to perform the construction. Therefore, a method of fastening with bolts and nuts is often employed.

  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 Document 1 describes a locking nut as shown in FIG.
That is, the locking nut 110 described in Patent Document 1 includes a nut base 112 and an extending projection 118 of a substantially truncated cone shape 116 that is connected in the direction of the screw shaft hole 130 of the nut base 112. Further, the extended protrusion 118 is provided with at least one slit 140 parallel to the screw shaft hole direction on the wall surface.

JP 2011-122712 A

  By the way, conventionally, when tightening or loosening a nut, a dedicated tool corresponding to the type of the nut has been used.

  However, especially when trying to loosen the nut, if there was no dedicated tool for the type of nut, the work of loosening the nut would not be easy, and it was a problem if the nut had to be loosened quickly. .

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

  In order to achieve the above object, a drop prevention device of the present invention extends from a first coil spring portion formed of a wound coil wire and one end of the coil wire of the first coil spring portion. An area of the coil wire, and an end region disposed outside the first coil spring portion, and a coil wire extending from the other end of the coil wire constituting the first coil spring portion, At least one arc-shaped region that is substantially concentric with the first coil spring portion and wound in an arc shape having a size of a semicircle or more, and at least one that is substantially concentric with the first coil spring portion and polygonal. A coil spring body having a polygonal region that is a circumferentially wound region and having a second coil spring portion that includes a winding diameter larger than the winding diameter of the first coil spring portion, and one facing each other Formed between the end face of one and the other end face A convex portion provided on an inner surface at a position corresponding to the second coil spring portion of the coil spring body accommodated coaxially with the through-hole in the through-hole, and the coil spring body; A concave portion into which the end region can be inserted is formed on the inner side surface, or the end region of the coil spring body can be inserted, and an opening that penetrates between the inner side surface and the outer side surface is formed. A main body.

  Here, the first coil spring portion is expanded by an end region that is an area of the coil wire extending from one end of the coil wire of the first coil spring portion and arranged outside the first coil spring portion. Easy to push in the radial direction.

  In addition, the second coil spring portion is formed by an arc-shaped region in which the coil wire of the second coil spring portion is wound in an arc shape that is substantially concentric with the first coil spring portion and has a semicircular or larger size However, it is easy to return from the reduced diameter position to the position before the diameter reduction.

  Further, the coil spring body is brought into contact with the inner surface of the main body by a polygonal region, which is a region in which the coil wire of the second coil spring portion is wound at least once around the polygonal shape substantially concentrically with the first coil spring portion. Easy to make.

  Further, the second coil spring portion includes a winding diameter larger than the winding diameter of the first coil spring portion, so that the coil spring body has a portion that does not fit into the thread groove formed in the leg portion of the bolt. Can do.

  In addition, a concave portion into which the end region of the coil spring body can be inserted is formed on the inner side surface, or an end portion region of the coil spring body can be inserted and penetrates between the inner side surface and the outer surface. The end region can be applied to the edge of the recess or the edge of the opening.

  In addition, a position corresponding to the second coil spring portion of the coil spring body accommodated coaxially with the through hole is formed inside the through hole formed so as to penetrate between the one end surface and the other end surface facing each other. By the convex portions provided on the inner surface, the vicinity of the corners of the polygonal region and the convex portions can be brought into contact with each other, and the diameter reduction of the coil spring body can be easily suppressed.

  In the dropout prevention device of the present invention, the second coil spring portion may include an arc-shaped region connected to the other end of the coil wire constituting the first coil spring portion.

  In this case, the second coil spring part is more likely to return from the reduced diameter position to the position before the diameter reduction.

  In the dropout prevention device of the present invention, the coil spring body has a tip region that is a region of the coil wire extending in a direction substantially orthogonal to the end region from the tip of the coil wire in the end region. Can do.

  In this case, the tip region is easily engaged with the main body, and the coil spring body is less likely to be detached from the main body.

  Further, in the dropout prevention device of the present invention, the inner surface of the main body at a position corresponding to the second coil spring portion of the coil spring body accommodated coaxially in the through hole corresponds to the corner portion of the polygonal region. The corners may be formed, and the projections may be provided between the corners.

  In this case, the coil spring body can be further brought into contact with the inner surface of the main body.

  The fall-off preventing device according to the present invention can be easily loosened by any tool.

It is a general | schematic exploded view which shows an example of the drop-off prevention tool to which this invention is applied. It is a schematic front view of the coil spring body of the drop-off prevention device to which the present invention is applied. It is a schematic plan view of the coil spring body of the drop-off prevention device to which the present invention is applied. It is a schematic sectional drawing along the AA line of FIG. It is a schematic perspective view which shows an example of the fall-off prevention tool to which this invention of the state which accommodated the coil spring body shown in FIG. 1 in the main body is applied. It is the schematic which shows an example of the fall-off prevention tool to which this invention with which the volt | bolt was mounted | worn was applied. FIG. 5B is a schematic plan view of a drop-off prevention device to which the present invention shown in FIG. 5A is applied. It is the schematic which shows an example when a loosening prevention tool to which this invention with which this volt | bolt was mounted was applied is loosened. FIG. 6B is a schematic plan view of a drop-off prevention device to which the present invention shown in FIG. 6A is applied. It is the schematic which shows an example of the front-end | tip area | region which comprises the coil spring body of the fall-off prevention tool to which this invention is applied. It is the schematic which shows the conventional locking nut.

  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 exploded view showing an example of a drop-off prevention device to which the present invention is applied. FIG. 2A is a schematic front view of a coil spring body of a drop-off prevention device to which the present invention is applied. FIG. 2B is a schematic plan view of the coil spring body of the drop-off prevention device to which the present invention is applied.

  FIG. 3 is a schematic cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic perspective view showing an example of a drop-off prevention device to which the present invention is applied in a state where the coil spring body shown in FIG. 1 is housed in the main body.

  A drop prevention tool 1 of the present invention shown in FIG. 1 includes a coil spring body 2 and a main body 3.

  Here, the coil spring body 2 includes a first coil spring portion 2A, an end region 21, and a second coil spring portion 2B.

The first coil spring portion 2A is composed of a coil wire wound with a predetermined diameter.
Here, the diameter of the first coil spring portion 2A is slightly smaller than the outer diameter of the leg portion of the bolt.

  Further, the end region 21 is a region of the coil wire extending from one end of the coil wire of the first coil spring portion 2A, and is disposed outside the first coil spring portion 2A.

The second coil spring portion 2B is composed of a coil wire extending from the other end of the coil wire constituting the first coil spring portion 2A.
Further, the coil wire constituting the second coil spring portion 2B is wound with a winding diameter larger than the winding diameter of the first coil spring portion 2A.

  That is, the second coil spring portion 2B has a semicircular size in which the coil wire extending from the other end of the coil wire constituting the first coil spring portion 2A is substantially concentric with the first coil spring portion 2A. Arc-shaped region 22 which is a region wound in a circular arc shape.

Further, the second coil spring portion 2B has at least one coil wire extending from the other end of the coil wire constituting the first coil spring portion 2A substantially concentrically with the first coil spring portion 2A and in a hexagonal shape. It includes a polygonal area 23 that is a circumferentially wound area.
Accordingly, the polygonal region 23 has at least six corners 23A.

  The arcuate region 22 is connected to the other end of the coil wire constituting the first coil spring portion 2A. That is, the coil wire constituting the arcuate region 22 extends from the other end of the coil wire constituting the first coil spring portion 2A.

  The polygonal region 23 is adjacent to the arcuate region 22. That is, the coil wire constituting the polygonal region 23 extends from the terminal end of the coil wire constituting the arcuate region 22.

  A through hole 4 is formed in the main body 3 of the dropout prevention device 1 of the present invention so as to penetrate between one end face and the other end face facing each other.

Moreover, the external shape of the main body 3 is a hexagon. That is, the cross-sectional shape of the main body 3 in the direction orthogonal to the central axis of the through hole 4 is a hexagonal shape.
Of course, the outer shape of the main body is not necessarily hexagonal. For example, the outer shape of the main body may be a pentagon or an octagon.

Moreover, as shown in FIG. 3, the through-hole 4 of the main body 3 is divided into three spaces having different inner diameters.
That is, an upper space 4A that is a space from one end face to substantially the same plane as the upper step portion 3A, and a middle space 4B that is a space from substantially the same plane as the upper step portion 3A to substantially the same plane as the lower step portion 3B. A lower space 4C that is a space from substantially the same plane as the lower step portion 3B to the other end surface of the main body 3.

Further, the inner diameter of the upper space 4A is the largest, the inner diameter of the middle space 4B is the second largest, and the inner diameter of the lower space 4C is the smallest.
That is, the inner space 4B has an inner diameter smaller than the inner diameter of the upper space 4A by the upper step portion 3A. Further, the inner diameter of the lower space 4C is smaller than the inner diameter of the middle space 4B by the amount of the lower step portion 3B.

  Further, a corner 7 is formed on the inner surface of the main body 3 forming the upper space 4A at a position corresponding to the protruding portion of the hexagonal main body 3.

Further, a convex portion 5 is provided between the corner portion 7 and the inner surface of the main body 3 forming the upper space 4A. Moreover, in the example shown in FIG. 1, the convex part 5 is provided in two places which mutually oppose.
Of course, the number of convex portions is not limited to this.

  Moreover, the opening part 6 which penetrates between a part of inner surface of the main body 3 which forms the middle part space 4B, and an outer surface is formed.

  Further, thread grooves and threads are formed on the inner surface of the main body 3 forming the lower space 4C. That is, the main body 3 has a screw portion 8.

  Further, when the coil spring body 2 is accommodated coaxially with the through hole 4 in the through hole 4 of the main body 3, the second coil spring portion 2 </ b> B is located in the upper space 4 </ b> A of the through hole 4.

That is, the convex portion 5 is provided on the inner surface of the main body 3 at a position corresponding to the second coil spring portion 2 </ b> B of the coil spring body 2 accommodated coaxially with the through hole 4 inside the through hole 4.
The corner portion 7 corresponds to the corner portion 23 </ b> A of the polygonal region 23 of the second coil spring portion 2 </ b> B of the coil spring body 2 accommodated coaxially with the through hole 4 inside the through hole 4.

  Further, as shown in FIG. 4, in a state where the coil spring body 2 is accommodated coaxially with the through hole 4 inside the through hole 4 of the main body 3, the first coil spring portion 2 </ b> A is in the middle space 4 </ b> B of the through hole 4. To position.

  Accordingly, in the state where the il spring body 2 is accommodated coaxially with the through hole 4 in the through hole 4 of the main body 3, the end region 21 is disposed outside the first coil spring portion 2A. The region 21 is inserted into the opening 6.

Further, the winding diameter of the first coil spring portion 2A and the inner diameter of the lower space 4C, that is, the inner diameter of the screw portion 8 are substantially the same.
The first coil spring portion 2A is not located in the lower space 4C.

  The first coil spring portion 2A and the second coil spring portion 2B are formed concentrically with each other, and the coil spring body 2 is accommodated coaxially with the through hole 4 inside the through hole 4 of the main body 3. ing.

  Accordingly, the leg portion of the bolt that has passed through the screw portion 8 of the main body 3 reaches the first coil spring portion 2A, and the screw groove in which the coil wire of the first coil spring portion 2A is formed in the leg portion of the bolt. Engage with.

The coil spring body 2 is not fixed to the main body 3.
This is because the winding diameter of the second coil spring portion 2B is only slightly smaller than the inner diameter of the upper space 4A of the main body 3, and the convex portion 5 provided on the inner surface of the main body 3 is the second coil spring portion. This is because the coil spring body 2 is not easily detached from the main body 3 even if the coil spring body 2 is not fixed to the main body 3 because it is in contact with 2B.

FIG. 5A is a schematic diagram showing an example of a drop-off prevention device to which the present invention is attached to a bolt. FIG. 5B is a schematic plan view of a dropout prevention tool to which the present invention shown in FIG. 5A is applied.
FIG. 6A is a schematic view showing an example of a state in which the drop-off prevention tool to which the present invention is attached to a bolt is loosened. FIG. 6B is a schematic plan view of the drop-off prevention device to which the present invention shown in FIG. 6A is applied.

As shown in FIG. 5A, in order to fix the fixed object 9, the dropout prevention tool 1 of the present invention is rotated to the right, which is the tightening direction 12, and attached to the leg 11 of the bolt 10.
Moreover, when removing the fall prevention tool 1 of the present invention from the leg portion 11 of the bolt 10, as shown in FIG. 6A, the fall prevention tool 1 of the present invention is rotated in the left direction which is the loosening direction 13.

  As shown in FIG. 5B, the corner 23 </ b> A of the polygonal region 23 corresponds to the corner 7 formed on the inner surface of the main body 3 when it is rotated in the direction 12 for tightening the drop-off prevention device 1 of the present invention. It is in.

  Note that the corner 23A of the polygonal region 23 is also in a state where the drop prevention tool 1 of the present invention is not rotated, that is, in a state where the drop prevention tool 1 of the present invention mounted on the leg 11 of the bolt 10 is stationary. Is in a position corresponding to the corner 7 formed on the inner surface of the main body 3.

On the other hand, as shown in FIG. 6B, the corner 23A of the polygonal region 23 is a corner formed on the inner surface of the main body 3 when it is rotated to the left, which is the direction 13 for loosening the dropout prevention device 1 of the present invention. It moves from the position corresponding to the part 7.
Then, the vicinity of the corner portion 23 comes into contact with the convex portion 5, or the corner portion 23 comes into contact with the inner surface of the main body 3.

That is, when the drop prevention tool 1 of the present invention is rotated in the loosening direction 13, the coil spring body 2 is reduced in diameter.
At this time, the coil wire of the first coil spring portion 2 </ b> A is pressed against the screw groove formed in the leg portion 11 of the bolt 10.

On the other hand, since the diameter of the coil spring body 2 is reduced, the end region 21 which is a region of the coil wire extending from one end of the coil wire of the first coil spring portion 2A moves toward the edge of the opening 6 and opens. It hits the edge of part 6.
And if it continues to rotate further in the direction 13 which loosens the drop-off prevention tool 1 of this invention, the edge of the opening part 6 will push the edge part area | region 21 to a diameter-expanding direction.

At this time, the vicinity of the corner portion 23A of the polygonal region 23 of the second coil spring portion 2B comes into contact with the convex portion 5, or the corner portion 23A comes into contact with the inner surface of the main body 3.
Accordingly, since the entire coil spring body 2 does not rotate, the coil spring body 2 is maintained in an expanded state, and can continue to rotate in the direction 13 for loosening the dropout prevention device 1 of the present invention.

  Note that the dropout prevention tool 1 of the present invention is not continuously rotated in the loosening direction 13, that is, unless a predetermined force is continuously applied to the dropout prevention tool 1 in the loosening direction 13. Since 1 does not loosen, even if vibration is applied to the dropout prevention device 1 of the present invention, there is no problem in terms of suppressing loosening of the object to be fixed.

  Moreover, the opening part which penetrates between the inner surface and the outer surface which can insert an edge part area | region does not necessarily need to be formed, and the recessed part which does not penetrate may be formed.

Further, the arc-shaped region does not necessarily have to be connected to the other end of the coil wire constituting the first coil spring portion.
However, if the arcuate region is connected to the other end of the coil wire constituting the first coil spring portion, the second coil spring portion is further moved from the reduced diameter position to the position before the diameter reduction. It is preferable because it is easy to return.

  In addition, although it is also considered that a polygonal area | region is connected with the other end of the coil strand which comprises a 1st coil spring part, in this case, a polygonal area | region is in the position before diameter reduction from the diameter-reduced position. When trying to return, the corner of the polygonal region remains fitted in the corner of the main body, and there is a high possibility that it will not return.

Moreover, the corner | angular part corresponding to the corner | angular part of a polygonal area | region is not necessarily formed in the inner surface of the main body of the position corresponding to the 2nd coil spring part of the coil spring body accommodated coaxially inside the through-hole. It does not have to be.
That is, the corner does not necessarily have to be formed at a position corresponding to the protruding portion of the hexagonal main body. For example, the inner surface of the main body at a position corresponding to the second coil spring portion is a curved surface. You can also.

  However, if the corner corresponding to the corner of the polygonal region is formed on the inner surface of the position corresponding to the second coil spring portion, the coil spring body can be further brought into contact with the inner surface of the main body, This is preferable because it is easier to stop the rotation of the coil spring body than in the case of a curved surface.

  FIG. 7 is a schematic view showing an example of the tip region constituting the coil spring body of the drop-off prevention device to which the present invention is applied.

In the example shown in FIG. 7, the coil spring body 2 has a tip region 21 </ b> A that extends from the tip of the coil wire in the end region in a direction substantially orthogonal to the end region.
That is, in the example shown in FIG. 7, the tip region 21A extends toward the side where a screw portion (not shown) is provided, and in FIG. 7, the tip region 21A extends downward.

  Since the coil spring body 2 has such a tip region 21 </ b> A, the tip region 21 </ b> A is easily engaged with the main body 3, and the coil spring body 2 is not easily detached from the main body 3.

  As described above, the drop-off prevention device of the present invention has the corners of the polygonal region by the convex portion provided on the inner surface at the position corresponding to the second coil spring portion of the coil spring body accommodated coaxially with the through hole. It is possible to easily suppress the diameter reduction of the coil spring body by bringing the vicinity of the portion into contact with the convex portion.

In addition, since the coil spring body is an area of the coil wire extending from one end of the coil element wire of the first coil spring portion and has an end region disposed outside the first coil spring portion. The first coil spring portion can be easily pushed in the diameter increasing direction.
And the recessed part which can insert the edge part area | region of a coil spring body is formed in the inner surface, or the opening part which can insert the edge part area | region of a coil spring body, and penetrates between an inner surface and an outer surface Is formed, the end region can be applied to the edge of the recess or the edge of the opening.

  Therefore, when the fall prevention tool of the present invention is rotated in the loosening direction, the end region can be pushed against the edge of the opening of the main body and pushed in the diameter increasing direction while suppressing the diameter reduction of the coil spring body. The fall-off prevention device of the invention can be easily loosened with any tool.

DESCRIPTION OF SYMBOLS 1 Drop prevention tool 2 Coil spring body 2A 1st coil spring part 2B 2nd coil spring part 3 Main body 3A Upper step part 3B Lower step part 4 Through-hole 4A Upper space 4B Middle part space 4C Lower part space 5 Protrusion part 6 Opening part 7 Corner part 8 Screw part 9 Fixed object 10 Bolt 11 Leg 12 Tightening direction 13 Loosening direction 21 End area 21A Tip area 22 Arc-shaped area 23 Polygonal area

Claims (4)

A first coil spring portion composed of a wound coil wire, a region of the coil wire extending from one end of the coil wire of the first coil spring portion, and the first coil spring portion The outer end region and the coil wire extending from the other end of the coil wire constituting the first coil spring portion are substantially concentric with the first coil spring portion and larger than a semicircle. An arcuate area that is an arcuately wound area and a polygonal area that is substantially concentric with the first coil spring portion and is an area wound at least once in a polygonal shape, and A coil spring body having a second coil spring portion including a winding diameter larger than the winding diameter of the first coil spring portion;
A position corresponding to the second coil spring portion of the coil spring body accommodated coaxially with the through hole formed in the through hole formed so as to penetrate between one end surface and the other end surface facing each other. A convex portion provided on the inner surface of the coil spring body, and a recess into which the end region of the coil spring body can be inserted is formed on the inner surface, or the end region of the coil spring body can be inserted. A dropout prevention device comprising: a main body formed with an opening penetrating between the inner surface and the outer surface. The dropout prevention tool according to claim 1, wherein the second coil spring portion includes the arcuate region connected to the other end of a coil wire constituting the first coil spring portion. The dropout according to claim 1, wherein the coil spring body has a tip region that is a region of a coil wire that extends in a direction substantially perpendicular to the end region from the tip of the coil wire of the end region. Prevention tool. A corner portion corresponding to a corner portion of the polygonal region is formed on an inner surface of the main body at a position corresponding to the second coil spring portion of the coil spring body coaxially accommodated inside the through hole. The drop-off prevention device according to claim 1, 2 or 3, wherein the convex portion is provided between the same corner portion and the same corner portion.

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