JP2022113012A - Eye bolt - Google Patents

Abstract

To provide an eye bolt that can reduce need for two types of supplies, which are an eye bolt and a blocking bolt, and reduce replacement work for bolts, when carrying in an out goods.SOLUTION: An eye bolt has a detachable bolt body and hanging hardware. The bolt body has a prismatic head part, and a male screw shaft erected at the center of the bottom surface of the head part. The head part has a non-through hole with an opening at the center of an upper surface. The hanging hardware has a base part, and a ring part whose part is fixed on the base part. The hanging hardware can insert/remove the base part into/from the non-through hole in an axial direction of a rotation shaft at a first rotation angle with the axial core of the male screw shaft as the rotation axis. Further, the hanging hardware is configured such that when the base part is inserted into the non-through hole and rotated to a second rotation angle, the base part is caught on the inner surface of the non-through hole and cannot be removed.SELECTED DRAWING: Figure 2

Description

The present invention relates to eyebolts.

For example, as disclosed in Patent Document 1 (Japanese Utility Model Registration No. 3185814), there is known an eyebolt in which a ring-shaped head portion and a bolt shaft are integrally formed.

Utility Model Registration No. 3185814

Eyebolts are used to lift heavy objects (several hundred kg) such as switch gears when moving or installing them. Specifically, the eyebolt is used to attach the bolt shaft to a bolt hole provided in the article to be lifted, and to hook the hook of a lifting device such as a crane to the ring-shaped head portion of the eyebolt to lift the article.

After installation of the article, the eyebolts are removed with a tool and the bolt holes in the article are plugged with plugging bolts because the protruding ring-shaped head is an aesthetic problem. The reason why the blocking bolt is inserted is to prevent dust (including rainwater if used outdoors) from entering the article through the bolt hole.

As described above, conventionally, it has been necessary to purchase two types of bolts, namely eye bolts and blocking bolts. In addition, a work cost was required to replace the eye bolt with a blocking bolt using a tool. It would be desirable to be able to reduce these costs.

The present invention was made to solve the above problems. SUMMARY OF THE INVENTION It is an object of the present invention to provide an eyebolt that can reduce the need to prepare two types of items, an eyebolt and a blocking bolt, and reduce the bolt replacement work in carrying-in and carrying-out of articles.

In order to achieve the above objects, the eyebolt according to the present invention is constructed as follows.
An eyebolt according to the present invention includes a bolt body and a lifting fitting that can be attached to and detached from the bolt body.

The bolt body has a prismatic head portion and a male threaded shaft erected at the center of the bottom surface of the head portion. The head portion has a non-through hole that is open at the center of the upper surface.

The hanging hardware has a base and a ring part having a ring portion fixed on the base.
The hanging fitting is capable of inserting and removing the base portion into and out of the non-through hole in the axial direction of the rotation shaft at a first rotation angle with the axis of the male screw shaft as the rotation axis.
Further, the hanging hardware is configured such that when the base is inserted into the non-through hole and rotated to a second rotation angle, the base is caught on the inner surface of the non-through hole and the base cannot be removed. ing.

In a first aspect, the base is a polygonal plank. The non-through hole has the polygonal cross-sectional shape of the opening with respect to a cross section perpendicular to the rotation axis, and the cross-sectional area inside the non-through hole is larger than the cross-sectional area of the opening.

In a second aspect, the base is a male threaded shaft. The non-through hole is a female threaded hole into which the male threaded shaft of the base can be screwed.

A 3rd aspect WHEREIN: The said bolt main body can replace with the said hanging metal fitting and can attach or detach the 2nd lifting metal fitting. The second hanger has a second base portion having the same shape as the base portion, and a second ring portion having a part of a ring fixed on the second base portion.
With respect to the rotation direction of the rotating shaft, the fixed angle of the second ring portion with respect to the second base portion differs from the fixed angle of the ring portion with respect to the base portion of the lifting fitting.
The second hanger is capable of inserting and removing the second base into and from the non-through hole in the axial direction of the rotating shaft at the first rotation angle.
In the second suspension fitting, in a state in which the second base portion is inserted into the non-through hole and rotated to the second rotation angle, the second base portion is caught on the inner surface of the non-through hole, and the second base portion is hooked to the inner surface of the non-through hole. It is configured so that the base cannot be removed.

According to the eyebolt of the present invention, after the lifting fitting is attached to the bolt body fastened to the article and used as a lifting fitting bolt, only the protruding lifting fitting can be removed without modifying the bolt body. The bolt body can be substituted as a blocking bolt. Therefore, it is not necessary to arrange a separate blocking bolt or to replace the bolt, and it is possible to reduce the material cost and shorten the work process.

FIG. 10 is a diagram for explaining a state in which eyebolts are attached to an article and the article is lifted; 1 is a perspective view of an eyebolt according to Embodiment 1 of the present invention; FIG. FIG. 2 is a cross-sectional view of the eyebolt taken along line AA according to Embodiment 1 of the present invention; 1 is a top view of an eyebolt according to Embodiment 1 of the present invention; FIG. FIG. 4 is a diagram for explaining the pattern of the hanger according to Embodiment 1 of the present invention; FIG. 5 is a perspective view of an eyebolt according to Embodiment 2 of the present invention; FIG. 10 is a BB cross-sectional view of an eyebolt according to Embodiment 2 of the present invention;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, when referring to the number, quantity, amount, range, etc. of each element in the embodiments shown below, unless otherwise specified or clearly specified by the number in principle, the reference The present invention is not limited to this number. Also, the structures and the like described in the embodiments shown below are not necessarily essential to the present invention unless otherwise specified or clearly specified in principle. Elements that are common in each drawing are denoted by the same reference numerals, and overlapping descriptions are omitted.

Embodiment 1.
With reference to FIG. 1, the state of use of the eyebolt will be described. FIG. 1 is a diagram for explaining a state in which eyebolts are attached to an article and the article is lifted.

The article 4 is a heavy article such as a switchgear, and is provided with a bolt hole at the end of the upper surface. The eyebolt 1 includes a bolt body 2 and a lifting fitting 3 detachable from the bolt body 2. - 特許庁The bolt body 2 is tightened into the bolt hole of the article 4 using a tool. A wire 5 is attached to a lifting fitting 3 attached to a bolt body 2, and an article 4 is lifted by pulling up the wire 5 by a crane 6. - 特許庁

The configuration of the eyebolt 1 will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is a perspective view of the eyebolt 1 according to Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view of the eyebolt 1 according to Embodiment 1 of the present invention taken along the line AA.

The hanging fitting 3 has a base portion 31 and a ring portion 32 . The base 31 is, for example, a polygonal thick plate. The shape of the base portion 31 shown in FIG. 2 is a regular quadrangle when viewed from above, but it may be any shape other than a perfect circle, such as an ellipse, rectangle, triangle, hexagon, octagon, cross shape, and the like. A portion of the ring portion 32 is fixed on the base portion 31 . Further, the hanging fitting 3 is rotatable around the axial center of the male screw shaft 22 as a rotating shaft 25 (FIG. 3).

The bolt body 2 has a head portion 21 and a male threaded shaft 22 having grooves on the outer surface of the cylinder. The male screw shaft 22 is erected at the center of the bottom surface of the head portion 21 . The male threaded shaft 22 can be screwed into a female threaded hole (bolt hole) provided on the upper surface of the article 4 .

The shape of the head portion 21 is prismatic. Although the shape of the head portion 21 shown in FIG. 2 is a hexagonal prism, it may be a triangular prism, a square prism, an octagonal prism, or the like. Further, the head portion 21 has a non-through hole 24 opened at the center of its upper surface. This opening portion is called an opening portion 23 .

In the non-through hole 24 , the cross-sectional shape of the opening 23 is similar to the cross-sectional shape of the base portion 31 in the cross section perpendicular to the rotating shaft 25 . In addition, the cross-sectional area inside the non-through hole 24 is larger than the cross-sectional area of the opening 23 . Specifically, the internal space of the non-through hole 24 has a width that allows the base 31 to rotate about the rotation shaft 25 while the base 31 is inserted.

In the following description, a rotation angle is an angle between a plane including the rotation axis 25 (an arbitrary plane is used as a reference plane) and a plane including the diameter of the ring portion 32 . The reference plane for the first rotation angle and the second rotation angle are the same.

The suspension fitting 3 is capable of inserting and removing the base portion 31 into and out of the non-through hole 24 in the axial direction of the rotation shaft 25 at the first rotation angle with the axis of the male screw shaft 22 as the rotation shaft 25 . The first rotation angle is the rotation angle of the hanger 3 , and is the rotation angle at which the base 31 can be inserted into the opening 23 by moving the base 31 in the axial direction of the rotation shaft 25 .

Further, the hanging fitting 3 is configured such that when the base 31 is inserted into the non-through hole 24 and rotated to the second rotation angle, the base 31 is caught on the inner surface of the non-through hole 24 and the base 31 cannot be removed. ing.

The second rotation angle will be described with reference to FIG. FIG. 4 is a top view of the eyebolt 1 according to Embodiment 1 of the present invention.

FIG. 4 shows a state in which the regular square base portion 31 is inserted into the non-through hole 24 and rotated to the second rotation angle when viewed from above. In the example shown in FIG. 4, the second rotation angle is an angle obtained by rotating the first rotation angle by 45 degrees.

The rotation stop pin 33 is inserted into the gap between the opening 23 and the base 31 at the second rotation angle to prevent the base 31 from rotating, thereby fixing the rotation position at the second rotation angle.

In the state shown in FIG. 4, movement of the base portion 31 in the axial direction of the rotating shaft 25 is prevented by engagement between the upper surface of the base portion 31 and the edge of the opening 23 (the inner surface of the non-through hole 24). Further, rotation of the base portion 31 in the circumferential direction of the rotating shaft 25 is prevented by the rotation stopping pin 33 . Therefore, the hoisting fitting 3 is fixed to the bolt body 2, and the eyebolt 1 functions as a hoisting fitting bolt.

In addition, when the base 31 is substantially rectangular or substantially elliptical, the second rotation angle is an angle obtained by rotating the first rotation angle by 90 degrees. When the base portion 31 is a substantially equilateral triangle, the second rotation angle is an angle obtained by rotating the first rotation angle by 60 degrees. When the base 31 is substantially a regular hexagon, the second rotation angle is an angle obtained by rotating the first rotation angle by 30 degrees. When the base portion 31 has a substantially regular M-sided shape, the second rotation angle is an angle obtained by rotating the first rotation angle by 180/M degrees (π/M radians).

As described above, according to the eyebolt 1 shown in FIGS. 1 to 4, the bolt body 2 and the lifting fitting 3 can be connected and separated. After the hoisting fitting 3 is attached to the bolt body 2 fastened to the article 4 and used as a hoisting fitting bolt (second rotation angle), only the protruding hoisting fitting 3 can be removed without modifying the bolt body 2. Yes (first rotation angle). The bolt body 2 does not protrude and can be substituted for a conventional blocking bolt. Therefore, it is not necessary to arrange a separate blocking bolt or to replace the bolt, and it is possible to reduce the material cost and shorten the work process.

<Modification>
By the way, when the bolt body 2 is fastened to the article 4, the final mounting angle of the head portion 21 varies depending on the cut position of the male threaded shaft 22 and is not uniform. When lifting the article 4 as shown in FIG. 1, if the lifting direction does not match the radial direction of the ring portion 32, the ring portion 32 may be deformed during lifting. Therefore, conventionally, when attaching the eyebolt, a washer is sandwiched between the bolt body 2 and the article 4, so that the lifting direction and the radial direction of the ring portion 32 are adjusted to match (Japanese Patent Application Laid-Open No. 2020-133788. (see publication). However, it would be desirable to be able to reduce the operational costs associated with such adjustments.

Therefore, one of a plurality of types of lifting fittings as shown in FIG. 5 is selected and attached to the bolt body 2 . FIG. 5 is a diagram for explaining three types of lifting fittings (3, 3b, 3c) having different fixing angles of the ring portion 32 with respect to the base portion 31. FIG.

FIG. 5B is a diagram showing the second hanger 3b. (C) of FIG. 5 is a diagram showing the third hanger 3c. The second base portion 31 b and the third base portion 31 c have the same shape as the base portion 31 . Regarding the rotation direction of the rotating shaft 25, the fixed angle of the second ring portion 32b with respect to the second base portion 31b ((B) in FIG. 5) is the same as the fixed angle of the ring portion 32 with respect to the base portion 31 of the lifting metal fitting 3 ((A in FIG. 5). )) is different. Further, the fixing angle ((C) of FIG. 5) of the third ring portion 32c with respect to the third base portion 31c is the same as that of the second hanging fitting 3b ((B) of FIG. 5) as well as the hanging fitting 3 ((A) of FIG. 5). Also different.

Specifically, in FIG. 5A, the ring surface (cross section in the radial direction of the ring portion) is arranged parallel to one side of the base portion 31 . In (C) of FIG. 5 , the ring surface is arranged parallel to the diagonal line of the base 31 . In (B) of FIG. 5, the positional relationship between the ring surface and the base portion 31 is configured to be different from (A) and (C).

If the base of the suspension fitting is approximately regular N-sided, the angle between the base and the ring should be between zero and π/N (radian). In other words, it is sufficient to prepare a plurality of lifting fittings in which the angles formed by the base and the ring are different from zero to the second rotation angle.

In this way, if a plurality of hoisting fittings having different fixing angles of the ring portion with respect to the base are prepared, after tightening the bolt body 2, the hoisting fitting whose lifting direction matches the radial direction of the ring portion 32 is selected and attached. This eliminates the need for adjustment with washers. Also, since the hanging fittings can be used repeatedly, there is no need to keep a large amount of inventory. A plurality of rotation stop pins are prepared so that they can be positioned at any angle. This modified example is also applicable to the following embodiments.

Embodiment 2.
Next, Embodiment 2 of the present invention will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a perspective view of an eyebolt according to Embodiment 2 of the present invention. FIG. 7 is a BB cross-sectional view of an eyebolt according to Embodiment 2 of the present invention.

The configuration shown in FIGS. 6 and 7 is basically the same as the configuration shown in FIGS. 2 and 3, except that the base 31 is a male threaded shaft 31d and the non-through hole 24 is a female threaded hole 24d. 6 and 7, explanations of the same configurations as those shown in FIGS. 2 and 3 will be simplified or omitted.

The hanging fitting 3 d has a male threaded shaft 31 d and a ring portion 32 . A portion of the ring portion 32 is fixed on the male screw shaft 31d. Further, the rotation axis 25 of the male threaded shaft 31 d is the same as the axial center of the male threaded shaft 22 .

The bolt body 2 d has a head portion 21 d and a male threaded shaft 22 . The shape of the head portion 21d is the same as that of the head portion 21 described above except for the female screw hole 24d. The female threaded hole 24d can be screwed with the male threaded shaft 31d.

According to the configuration shown in FIGS. 6 and 7, by tightening the male threaded shaft 31d into the female threaded hole 24d, the lifting fitting 3d can be fixed to the bolt body 2d and used as a lifting fitting bolt. In addition, after the bolt is used as a hoisting tool, only the protruding hoisting tool 3d can be removed without modifying the bolt body 2d.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

1 Eyebolts 2, 2d Bolt bodies 3, 3d Lifting metal fitting 3b Second lifting metal fitting 3c Third lifting metal fitting 4 Article 5 Wire 6 Cranes 21, 21d Head portion 22 Male threaded shaft 23 Opening 24 Non-through hole 24d Female threaded hole 25 Rotating shaft 31 Base portion 31b Second base portion 31c Third base portion 31d Male screw shaft 32 Ring portion 32b Second ring portion 32c Third ring portion 33 Rotation stop pin

Claims (4)

a bolt body having a prismatic head portion and a male screw shaft erected at the center of the bottom surface of the head portion, the head portion having a non-through hole with an opening at the center of the top surface;
a suspension fitting having a base and a ring portion having a ring part fixed on the base;
The hanging hardware is
The base can be inserted into and removed from the non-through hole in the axial direction of the rotation shaft at a first rotation angle with the axis of the male screw shaft as the rotation axis,
wherein the base is caught on the inner surface of the non-through hole in a state in which the base is inserted into the non-through hole and rotated to a second rotation angle, so that the base cannot be removed;
An eyebolt characterized by: The base is a polygonal plank,
In the non-through hole, the cross-sectional shape of the opening in a cross section perpendicular to the rotation axis is the polygon, and the cross-sectional area inside the non-through hole is larger than the cross-sectional area of the opening;
2. The eyebolt of claim 1, wherein: The base is a male threaded shaft,
The non-through hole is a female threaded hole into which the male threaded shaft of the base can be screwed;
2. The eyebolt of claim 1, wherein: Instead of the lifting metal fitting, the bolt body has a second base part having the same shape as the base part and a second ring part having a part of the ring fixed on the second base part. is possible and
With respect to the rotation direction of the rotating shaft, the fixed angle of the second ring portion with respect to the second base is different from the fixed angle of the ring portion with respect to the base of the hanging bracket,
The second suspension fitting is
at the first rotation angle, the second base can be inserted into and removed from the non-through hole in the axial direction of the rotation shaft;
In a state in which the second base is inserted into the non-through hole and rotated to the second rotation angle, the second base is caught on the inner surface of the non-through hole and cannot be pulled out. is being done,
2. The eyebolt of claim 1, wherein:

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