JP6600469B2 - Fall-off prevention device - Google Patents

Description

  The present invention relates to a drop-off prevention tool that prevents a bolt from dropping off.

  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. Fixing by welding requires equipment such as a gas cylinder and a burner, and it takes time and labor for the construction, so a method of fastening with bolts and nuts is often employed. In the method of fastening using a bolt and a nut, since the fastened nut may be loosened due to vibration or the like, a drop-off preventing tool for preventing the nut from loosening has been proposed.

For example, Patent Document 1 has a first coil spring portion made of a coil wire wound in a predetermined direction, and one end connected to one end of a coil wire constituting the first coil spring portion. A second coil spring portion having a diameter smaller than an inscribed circle of the first coil spring portion, the coil coil wire being wound in the same direction as the predetermined direction, and the first coil spring portion. A coil element wire having one end connected to the other end opposite to one end of the coil element wire of the second coil spring portion connected to one end of the coil element wire and wound in the same direction as the predetermined direction And a third coil spring portion having an inscribed circle larger than the diameter of the second coil spring portion, and the shape of the first coil spring portion is substantially the same as the shape of the third coil spring portion. The invention of the fall-off prevention device is proposed .
The drop-off prevention tool described in Patent Document 1 is a device in which a second coil spring portion is screwed into a bolt to prevent loosening of a nut or an object to be fixed.

International Publication No. 2011/145212

  In the drop-off prevention device of Patent Document 1, all the second coil spring portions are wound with the same diameter, and the inner diameter of the second coil spring portion is formed to be substantially smaller than the bolt diameter. Therefore, in order to attach to the bolt, there is a problem in workability because it has to be screwed in while strongly pressing and expanding the second coil spring portion. In addition, since the second coil spring portion is all wound with the same diameter, when the second coil spring portion is mounted on the bolt, the second coil spring portion is in close contact with the bolt groove along its entire length, and the second coil spring portion and the first and first coil spring portions are in close contact with each other. The part which connects 3 coil spring parts does not have spring elasticity. Therefore, since the impact from the nut or the object to be fixed is applied to the drop-off prevention device without being absorbed, the second coil spring portion and the first and third coil spring portions are connected during long-term use. The part sometimes broke due to metal fatigue. Furthermore, the drop-off prevention tool of Patent Document 1 is preferably a square wire having a substantially square cross-sectional shape of the coil wire. However, when the corners are worn, there is a problem that the drop-off prevention device becomes easy to loosen.

  An object of the present invention is to provide a drop-off prevention tool that can be screwed into a bolt with a small force and is excellent in durability and reliability.

1. A first coil spring portion composed of a coil wire wound in a predetermined direction;
The first coil spring portion includes one end connected to one end of the coil wire and is configured by a coil wire wound in the same direction as the predetermined direction, and is inscribed in the first coil spring portion. A second coil spring portion having a diameter smaller than a circle;
One end connected to the other end opposite to one end of the coil element wire of the second coil spring part connected to one end of the coil element wire of the first coil spring part, and wound in the same direction as the predetermined direction A third coil spring portion having an inscribed circle larger than the diameter of the second coil spring portion, the third coil spring portion being configured with a turned coil wire;
The shape of the first coil spring portion is substantially the same as the shape of the third coil spring portion,
The second coil spring portion is formed of three or more turns, and half-turns at both ends of the second coil spring portion are wound so that the radius of curvature gradually increases.

2. The coil wire has a substantially circular cross-sectional shape. The fall-off prevention device described in 1.
3. The other end opposite to one end of the coil wire of the first coil spring part connected to one end of the second coil spring part is directed to the inside of the first coil spring part,
The other end of the third coil spring portion that is connected to the other end of the coil wire of the second coil spring portion is directed to the inside of the third coil spring portion. Characterized by Or 2. The fall-off prevention device described in 1.
4). The first coil spring portion and the third coil spring portion are adjacent to each other,
The other end of the first coil spring portion connected to one end of the second coil spring portion opposite to the one end of the coil strand and the other end of the second coil spring portion connected to the other end of the coil strand. The other end of the third coil spring portion opposite to the one end of the coil strand is located between the coil strand constituting the first coil spring portion and the coil strand constituting the third coil spring portion. Characterized by To 3. The fall prevention tool according to any one of the above.
5. 1. The shape of the first coil spring part and the shape of the third coil spring part are substantially hexagonal. To 4. The fall prevention tool according to any one of the above.

The drop-off prevention device according to the present invention is wound such that the half turns at both ends of the second coil spring screwed into the bolt gradually increase in curvature radius. Since the diameter of the part where the bolt is screwed first is large, the force required at the beginning of screwing the drop-off prevention tool into the bolt is small, and the workability is excellent. Further, the half turns at both ends of the second coil spring of the drop-off preventing tool are formed so that the radius of curvature gradually increases, that is, both ends of the second coil spring part are formed so as to slightly float from the thread groove. The portion connecting the second coil spring portion and the first and third coil spring portions has spring elasticity. The spring elasticity absorbs and attenuates the impact from the nut and the object to be fixed, so that the drop-off prevention device of the present invention does not break even when used for a long time.
In addition, if the cross-sectional shape of the coil strand is substantially circular, the coil strand and the thread groove do not come into contact with each other at a corner.

The other end opposite to one end of the coil element wire of the first coil spring part connected to one end of the second coil spring part is directed to the inside of the first coil spring part, and the coil element wire of the second coil spring part Since the other end opposite to one end of the coil element wire of the third coil spring part connected to the other end is directed to the inside of the third coil spring part, the drop prevention devices are less likely to get entangled, so that a large number of dropouts occur. Even if the preventer is put in the same bag, it is easy to take out one by one and the workability is improved.
The first coil spring portion and the third coil spring portion are adjacent to each other and connected to one end of the second coil spring portion. The other end opposite to one end of the coil wire of the first coil spring portion, and the second coil spring The other end of the third coil spring portion connected to the other end of the coil strand of the third portion is opposite to the other end of the coil strand of the third coil spring portion, and the coil strand constituting the first coil spring portion and the third coil spring portion are By disposing between the coil wires constituting, the drop-off prevention tool can be made compact, so that it becomes easy to handle a number of drop-off prevention tools.
Moreover, when the shape of the first coil spring portion and the shape of the third coil spring portion are substantially hexagonal, the drop-off prevention tool can be attached to the bolt without changing a general-purpose tool such as a socket wrench used for attaching the nut. it can.

The perspective view of the drop-off prevention tool of the first embodiment. The side view of the drop-off prevention tool of the first embodiment. The elements on larger scale of the drop-off prevention tool of the first embodiment. The perspective view of the drop-off prevention tool of the second embodiment. The side view of the drop-off prevention tool of the second embodiment. Schematic which shows the state which mounted | wore the bolt with the drop-off prevention tool of the first embodiment.

The fall prevention tool of the present invention is
A first coil spring portion composed of a coil wire wound in a predetermined direction;
The first coil spring portion includes one end connected to one end of the coil wire and is configured by a coil wire wound in the same direction as the predetermined direction, and is inscribed in the first coil spring portion. A second coil spring portion having a diameter smaller than a circle;
One end connected to the other end opposite to one end of the coil element wire of the second coil spring part connected to one end of the coil element wire of the first coil spring part, and wound in the same direction as the predetermined direction A third coil spring portion having an inscribed circle larger than the diameter of the second coil spring portion, the third coil spring portion being configured with a turned coil wire;
The shape of the first coil spring portion is substantially the same as the shape of the third coil spring portion,
The second coil spring portion is formed of three or more turns, and half turns at both ends of the second coil spring portion are wound so that the radius of curvature gradually increases.

Hereinafter, the dropout prevention device of the present invention will be described with reference to the drawings.
A perspective view of a first embodiment of the drop-off prevention device of the present invention is shown in FIG. 1, and a side view thereof is shown in FIG.

The drop-off prevention tool 10 of the present invention is wound in a direction to be fitted from the leg portion of the bolt toward the head portion of the bolt when rotated in the clockwise direction indicated by reference sign a in FIG.
A first coil spring portion 1 composed of a coil wire wound in a substantially hexagonal shape;
The first coil spring includes a coil wire that has one end connected to one end of the coil wire constituting the first coil spring portion and is wound in a substantially circular shape in the same direction as the first coil spring portion 1. A second coil spring portion 2 having a diameter smaller than the inscribed circle of the portion 1;
Same as the first coil spring part 1, having one end connected to the other end opposite to one end of the coil element wire of the second coil spring part 2 connected to one end of the coil element wire of the first coil spring part 1. And a third coil spring portion 3 having an inscribed circle larger than the diameter of the second coil spring portion 2.

  The shape of the first coil spring part 1 and the shape of the third coil spring part 3 are substantially the same. Note that “the shape of the first coil spring portion” and “the shape of the third coil spring portion” mean a shape in a plane perpendicular to the bolt. Since the shape of the first coil spring portion and the shape of the third coil spring portion are substantially the same, the drop-off prevention device of the present invention can be attached to the bolt from either the first coil spring portion or the third coil spring portion. can do. Moreover, since the shape of the 1st coil spring part and the shape of the 3rd coil spring part in the drop-off prevention tool of this embodiment are substantially hexagons, drop-off prevention is performed using a socket wrench for screwing the nut onto the bolt. The tool can be screwed onto the bolt. Since the drop-off prevention tool can be attached to the bolt without changing the tool used for attaching the nut, the workability is excellent.

  A base end portion 1A that is the other end opposite to one end of the coil wire of the first coil spring portion 1 connected to one end of the second coil spring portion 2 is wound toward the third coil spring portion 3. ing. Similarly, the tip portion 3A, which is the other end opposite to one end of the coil wire of the third coil spring portion 3 connected to the other end of the coil wire of the second coil spring portion 2, is the first coil spring portion. It is wound in the direction of 1. As can be seen from FIG. 2, when viewed from the side, the first coil spring portion 1 and the third coil spring portion 3 are adjacent to each other such that the second coil spring portion is hardly visible. Further, the base end portion 1A of the first coil spring portion 1 and the tip end portion 3A of the third coil spring portion are a coil wire constituting the first coil spring portion and a coil wire constituting the third coil spring portion. Located in between and facing each other.

  The second coil spring portion 2 is formed of three or more turns, and the half turns at both ends of the second coil spring portion 2 are wound so that the radius of curvature gradually increases. When the second coil spring portion is shorter than 3 turns, the length in contact with the bolt is shortened and the contact area with the bolt is reduced, so that the drop-off preventing property is lowered. The upper limit of the number of turns of the second coil spring portion 2 is not particularly limited, but if it is too large, the drop-off prevention tool becomes bulky, so that it is preferably small and most preferably three. Moreover, it is preferable that the radius of curvature gradually increases so that the half turns at both ends of the second coil spring portion 2 become larger than the diameter of the coil wire.

  The second coil spring portion 2 is formed such that the inner diameter of the central portion excluding both ends is slightly smaller than the outer diameter of the bolt leg portion and larger than the diameter of the circle formed by the bottom portion of the screw groove. And the half turns of the both ends of the 2nd coil spring part 2 are formed so that a curvature radius may become large gradually. Since the diameter of the part screwed first into the bolt is large, the drop-off prevention tool of the present invention is easy to screw with less force required at the beginning of screwing the drop-off prevention tool into the bolt, and has excellent workability. Further, since the end of the screw groove, which is the tip of the bolt, and the second coil spring are easily fitted, it is easy to attach to the bolt regardless of the error in the diameter of the bolt leg and the position of the end of the screw groove.

  In the drop-off prevention device of the present invention, when the second coil spring part 2 is formed with three turns, the second part of the center part of the second coil spring part 2 is in close contact with the bolt. Since the half turns at both ends of the second coil spring portion 2 are wound so that the radius of curvature gradually increases, the half turns at both ends are separated from the screw grooves on the way, and both ends of the second coil spring portion are It floats slightly from the thread groove. When the drop prevention tool of the present invention is attached to the bolt, both ends of the second coil spring portion are not in close contact with the thread groove and can be deformed, and thus have spring elasticity. This spring elasticity absorbs and attenuates the impact from the nut and the object to be fixed, so that the drop-off prevention device of the present invention does not easily break down even when force is applied by vibration or the like and does not break.

  In the drop prevention tool of the present invention, the cross-sectional shape of the coil wire is not limited, and for example, a substantially circular or substantially square steel wire can be used. Since the coil wire and the thread groove do not come into contact at the corners, and the coil wire easily fits into the thread groove and is not easily worn, the coil wire may be a steel wire or a round steel having a substantially circular cross section. preferable. The cross-sectional shape is not limited to a perfect circle, and may be oval or egg-shaped. The diameter of the coil wire only needs to be large enough to fit in the screw groove of the bolt. That is, the diameter may be any diameter that can contact both surfaces of the screw groove of the bolt, and preferably has a diameter of 20 to 80% of the depth of the screw groove, and more preferably has a diameter of 30 to 70%. .

FIG. 3 is a partially enlarged view showing a state in which the proximal end portion 1A of the coil wire and the distal end portion 3A of the coil wire are directed inward in the dropout prevention device of the first embodiment. FIG. 3 is a view as seen from the first coil spring part 1 side. The first coil spring part 1 is located above the base end part 1A of the first coil spring part 1 and the tip part 3A of the third coil spring part. The coil wire of the coil spring portion is omitted.
In FIG. 3, the base end portion 1A of the coil wire constituting the first coil spring portion 1 and the tip end portion 3A of the coil wire constituting the third coil spring portion 3 are directed toward the inside of the drop-off prevention device. It is bent 5 °. By bending each of them inward, the drop-off prevention tools are less likely to get entangled, so even if a number of drop-off prevention tools are put in the same bag, they can be easily taken out one by one and workability is improved. In addition, the angle bent inside is not limited to 5 °.

FIG. 4 is a perspective view of a second embodiment of the drop-off preventing device of the present invention, and FIG. 5 is a side view thereof.
The drop-off prevention device 1 of the second embodiment is the same as the first embodiment except that the first coil spring portion 1, the second coil spring portion 2, and the third coil spring portion 3 are wound around one from the top to the bottom. This is the same as the embodiment.
The drop-off prevention device of the second embodiment is less expensive than the drop-off prevention device of the first embodiment because it is easy to manufacture.

  The drop-off prevention device of the present invention is not limited to the above embodiment. For example, the shape of the first coil spring portion and the third coil spring portion may be a substantially square shape, a substantially octagonal shape, a substantially circular shape, or the like. Further, the coil wires of the first coil spring part, the second coil spring part, and the third coil spring part may be wound in a clockwise direction according to the thread groove of the bolt, or may be wound counterclockwise. May be turned.

FIG. 6 is a schematic view showing a state in which the dropout prevention tool 10 according to the first embodiment of the present invention is attached to the bolt 4. A procedure for mounting the dropout prevention tool 10 of the present invention on the bolt 4 will be described.
In the state where the second coil spring portion 2 of the drop-off prevention device 10 of the present invention and the tip portion 41 of the bolt 4 are in contact with each other, the drop-off prevention device 10 is rotated in the direction indicated by symbol a in FIG. The coil wire constituting the coil spring portion 2 is inserted into the thread groove from the tip 41 of the bolt 4. In FIG. 6, the bolt 4 is attached from the third coil spring portion 3, but as described above, the drop-off prevention tool 10 of the present invention is from either the first coil spring portion 1 or the third coil spring portion 3. But it can be attached to the bolt 4.

  The half turns at both ends of the second coil spring portion 2 of the present invention are formed so that the radius of curvature gradually increases, and the diameter of the portion that is first screwed into the bolt is large and is necessary at the beginning of screwing the drop-off prevention device into the bolt. Since the force is small, it is easy to screw and has excellent workability. At this time, since the first coil spring portion 1 and the third coil spring portion 3 of the drop-off prevention tool 10 are substantially hexagonal, the drop-off prevention tool 1 is attached to the bolt 4 using a general-purpose tool such as a hexagon socket wrench. can do. Then, the dropout prevention tool 10 is mounted by screwing the dropout prevention tool 10 until the third coil spring portion 3 contacts the nut 5.

  The inner diameter of the central part of the second coil spring part 2 is slightly smaller than the outer diameter of the leg part of the bolt 4 and larger than the diameter of the circle formed by the bottom part of the screw groove. For this reason, the coil wire constituting the central portion of the second coil spring portion 2 is fitted so as to fill the screw groove, and the coil wire fastens the bolt with an elastic force. As a result, a strong frictional force is generated between the coil wire and the screw groove, and the second coil spring portion 2 is firmly fixed to the screw groove of the bolt 4. Since the dropout prevention tool of the present invention is firmly fixed to the screw groove and does not loosen, the nut 5 located under the dropout prevention tool 10 does not loosen.

The drop-off prevention device of the present invention can also serve as a bolt fastener as a substitute for a nut.
That is, the coil element constituting the second coil spring part 2 is rotated by rotating the drop-off prevention tool while the second coil spring part 2 of the drop-off prevention tool of the present invention is in contact with the tip 41 of the bolt 4. The wire is inserted into the screw groove from the tip 41 of the bolt 4. The half turns at both ends of the second coil spring portion 2 of the present invention are formed so that the radius of curvature gradually increases, and since the diameter of the portion that is first screwed into the bolt is large, the drop prevention tool is initially screwed into the bolt. Less force required, easy to screw in, and excellent workability. Then, the fastener is rotated until the third coil spring portion 3 comes into contact with the fixed object and is in a compressed and deformed state.

  Moreover, the fall prevention tool 10 attached to the bolt 4 shown in FIG. 6 can be removed from the bolt 4 by fitting a general-purpose tool into the fall prevention tool 10 and rotating it in the direction opposite to the symbol a. When the drop prevention tool 1 is rotated in the direction opposite to the symbol a, a force is applied to the connecting portion between the third coil spring portion 3 and the second coil spring portion 2 in the direction opposite to the symbol a. The coil spring portion 2 is deformed in the direction in which the inner diameter is enlarged, and the coil wire that fits into the thread groove formed in the leg portion of the bolt 4 becomes floating. Since the frictional force between the second coil spring part 2 and the leg part of the bolt becomes small, the drop-off prevention tool 10 can be smoothly rotated in the separation direction.

  As described above, in the drop-off preventing device of the present invention, the coil wire constituting the second coil spring portion is fitted into the screw groove formed in the bolt, and the coil wire tightens the bolt to generate a strong frictional force. Therefore, even if an impact or vibration is applied, the drop-off prevention device does not loosen. Therefore, it is possible to prevent the nut and the object to be fixed located below the drop-off prevention tool from loosening from the bolt.

DESCRIPTION OF SYMBOLS 10 Falling prevention tool 1 1st coil spring part 1A Base end part 2 2nd coil spring part 3 3rd coil spring part 3A Tip part 4 Bolt 41 Bolt tip part 5 Nut

Claims (4)

A first coil spring portion composed of a coil wire wound in a predetermined direction;
The first coil spring portion is constituted by a coil wire wound in the same direction as the predetermined direction, having one end connected to one end of a coil wire constituting the first coil spring portion via a linear connection portion, and A second coil spring portion having a diameter smaller than the inscribed circle of the first coil spring portion;
One end connected to the other end opposite to one end of the coil element wire of the second coil spring part connected to one end of the coil element wire of the first coil spring part via a linear connection part; A coil spring wound in the same direction as the predetermined direction, and a third coil spring part having an inscribed circle larger than the diameter of the second coil spring part,
The shape of the first coil spring portion is substantially the same hexagon as the shape of the third coil spring portion,
The second coil spring portion is formed of three or more turns, and at least half turns at both ends of the second coil spring portion are gradually curved so as to be larger than the diameter of the coil wire at both ends connected to the connection portion. A drop-off prevention device , wherein the second coil spring portion is lifted from the screw groove when wound to have a large radius and attached to the bolt leg portion .   The fall prevention tool according to claim 1, wherein the coil wire has a substantially circular cross-sectional shape. The other end opposite to one end of the coil wire of the first coil spring part connected to one end of the second coil spring part is directed to the inside of the first coil spring part,
The other end of the third coil spring portion that is connected to the other end of the coil wire of the second coil spring portion is directed to the inside of the third coil spring portion. The drop-off prevention device according to claim 1 or 2, characterized in that. The first coil spring portion and the third coil spring portion are adjacent to each other,
The other end of the first coil spring portion connected to one end of the second coil spring portion opposite to the one end of the coil strand and the other end of the second coil spring portion connected to the other end of the coil strand. The other end of the third coil spring portion opposite to the one end of the coil strand is located between the coil strand constituting the first coil spring portion and the coil strand constituting the third coil spring portion. 4. A dropout prevention device according to any one of claims 1 to 3.

Images