JPH0645686Y2 - Eyebolt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an improvement of an eyebolt used for lifting a relatively heavy article (work).

<Prior Art> A so-called eyebolt is used for attaching a work to be lifted by using the bolt hole and lifting the work with a lifting device such as a crane.

Therefore, depending on the size of the work to be hoisted or the diameter of the bolt hole provided for the original use of the work, etc. I prepare and use the ones.

<Problems to be solved by the invention> Generally, the eye bolt is screwed into the work by hand. Therefore, when the bolt portion is long, there is a problem that it takes time to tighten the bolt and workability is poor.

Also, when the eyebolt is used in a work lifting line in a factory, etc., when the height of the lifted work changes frequently, the position of the eyebolt also changes.Therefore, adjust the hook position on the lifting device side. Alternatively, an operation such as changing the length of a wire rope or the like to be interposed between the hook and the eyebolt is required, and the usability remains complicated.

The present invention has been provided in order to solve the above-mentioned conventional problems.

An object of the present invention is to provide a convenient eyebolt that improves workability by enabling tightening by an automatic tool such as a nutrunner and adjusting the hook bolt height position of the eyebolt.

<Means for Solving the Problems> In order to achieve the above-mentioned object, an eyebolt according to the present invention has a polygonal outer shape on the outer side of a bolt shaft facing portion of a ring-shaped head portion located on the bolt axis line of the eyebolt. The nut-shaped protrusion is integrally formed and a female screw concentric with the bolt shaft is formed through the nut-shaped protrusion to the ring-shaped head.

<Operation> When tightening the eyebolt to the work, screw in the tip of the bolt shaft by hand to the extent that it becomes self-supporting in the mounting screw hole of the work, and then attach the required automatic tool such as a nutrunner to the nut-shaped protrusion of the eyebolt. Then tighten.

If there are many works and the lifting height of the lifting device for each eyebolt is different, another appropriate eyebolt is connected to the nut-shaped projection of the eyebolt attached to the work. In this case, it is possible to connect so-called two-stage and three-stage eyebolts if necessary. By this connection, the hooking heights of the respective works are made uniform, so that the lifting work by the lifting device can be performed quickly.

<Embodiment> A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a cross-sectional view of a main part of an eyebolt according to a first embodiment of the present invention, and FIG. 2 is a plan view of FIG.

In the figure, reference numeral 1 is an eyebolt, and a bolt shaft 2 having a male thread engraved on the outer periphery thereof, and a ring-shaped head portion 3 at one end of the bolt shaft 2 instead of a hexagonal head found in a so-called ordinary bolt.
Is formed. Further, a hexagonal columnar nut-shaped projection 4 is formed outside the bolt shaft facing portion of the ring-shaped head portion 3 located on the axis of the bolt shaft 2. Then, a hole concentric with the bolt shaft 2 is bored through the nut-shaped protrusion 4 and the ring-shaped head portion 3, and a female screw 5 is engraved. The inner diameter of the female screw 5 may be set to the same diameter as the bolt shaft 2 or may be set to a different diameter, and is set appropriately.

When the eyebolt 1 having the above-described structure is used for lifting a work (not shown), when the work is attached to the work, the eyebolt 1 is screwed into the attachment screw hole of the work by hand so that the eyebolt 1 is self-supporting in advance. Then, a required automatic tool (not shown) such as a nut runner is attached to the nut-shaped projection 4 of the eyebolt 1 and tightened by the automatic tool.

The above-mentioned automatic tool is also used when loosening and removing the eyebolt 1 tightened on the work.

Also, for example, when there are many workpieces to be lifted in the stockyard and the workpiece heights are different from each other, the eyebolts 1 are first attached in the same manner as above, and then the required number of eyebolts 1 are installed in order to make the hooking height of each workpiece uniform.
(1a, 1b, 1c ...) to the nut-shaped projection 4 of the eyebolt 1 of each work, and the eyebolt 1 (1a, 1b,
1c ...) are further connected to the required number of nut-shaped projections 4 (4a, 4b, 4c ...). As a result, even when the heights of the works are not uniform, the hooking work positions of the works become substantially the same when hoisting by the lifting device, and smooth work can be performed.

FIG. 3 shows another embodiment of the eyebolt according to the present invention.

The part different from the first embodiment is the shape of the inner shape part 31 of the ring-shaped head part 30.

In the second embodiment, the inner shape part 31 is formed in a rectangular shape. Thereby, when a large number of the eye bolts 10 are arranged in parallel and an appropriate bar material is passed between the eye bolts, and when this bar material is used for lifting or when it is used as a holding bracket or the like for temporarily storing the work, It can be safely used without rattling between the eyebolt 10 and the bar material. That is, when the bar member is fixed by screwing an appropriate bolt or the like from the nut-shaped protrusion 4, there is a difference in pressing force or the like between the fixing parts. Therefore, when the bar member is a cylindrical member,
If the inner shape of the ring-shaped head portion is circular, there is a problem that the center is displaced due to slippage or the like, resulting in unstable fixation. Therefore,
In order to prevent this, if the inner shape portion 31 of the ring-shaped head is formed into a square shape, it is possible to stably fix the bar material, whether it is a cylindrical material or a prismatic material.

In any of the above-mentioned embodiments, the screwing into the female screw 5 of the nut-shaped projection 4 of the eyebolts 1 and 10 is not limited to the other eyebolts, and other screwing members such as the above-mentioned normal bolts may be used. Appropriate members can be connected according to the purpose of use.

<Effects of the Invention> As described above in detail, according to the present invention, it is possible to perform a quick and efficient work using the automatic tool for tightening by utilizing the nut-shaped protrusion. When adjusting the height position of the hooking work of, it is possible to use it as it is by connecting other members to the nut-shaped protrusion without removing the already installed eyebolt, which improves workability. it can.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part of an eyebolt according to a first embodiment of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an eyebolt according to another embodiment of the present invention. FIG. 1 ・ 10 …… Eyebolts, 2 …… Bolt shafts, 3 ・ 30 …… Round heads, 4 …… Nut-shaped projections, 5 …… Female threads

Claims (1)

[Scope of utility model registration request] 1. A nut-shaped protrusion having a polygonal outer shape is integrally formed on the outer side of a portion facing the bolt shaft of a ring-shaped head portion located on the bolt axis of an eyebolt, and a female screw concentric with the bolt shaft is nut. An eyebolt characterized by being formed by penetrating the ring-shaped head from the protrusion.