JPH028079Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] The invention facilitates attachment and detachment of support members such as rope support fittings using step bolts attached to utility poles, steel towers, etc. The present invention relates to an attachment/detachment device.

[Technical background of the invention and its problems] For example, when installing cables on utility poles or steel towers, step bolts that are attached to them and protrude in an almost horizontal direction are used.

In other words, the step bolt is used as a foothold for the worker to secure the worker's body to structures such as utility poles and steel towers using safety belt ropes, and the worker's body is maintained during installation work to maintain the safety and stability of the worker's body.

By the way, the frequency of accidents such as falls associated with working at heights is relatively high when ascending and descending, and the reason for this is that workers often rely on their five senses to perform the work.

In order to prevent the above-mentioned accidents, at present, a support rope is stretched vertically between the top and bottom of the structure, and a removable hardware called a sliding lifting rope is attached to this rope. The metal objects and the body are connected to move up and down.

In order to maintain a certain distance from the structure, rope support fittings are attached to the support ropes at vertical intervals of approximately 20 to 30 meters, and these support fittings temporarily attach the step bolts of the structure. , remove it, and use the screw part to install it.

However, with this method, it takes time to attach and detach the rope support metal fittings, which inevitably leads to inefficiency in the installation work, and there is a problem in terms of safety since the work must be done at a high place.

[Purpose of the invention] The present invention was made based on the above-mentioned circumstances, and an object thereof is to provide a device for attaching and detaching a supporting member such as a rope support fitting, which is easy to attach and detach and is highly safe.

[Summary of the invention] The device for attaching and detaching a support member to a step bolt of the present invention includes a cavity with one end closed, and a wall of the cavity has a width approximately equal to the diameter of the step bolt from the open end of the cavity to the vicinity of the closed end. Further, a cutout opening having a width approximately equal to the diameter of the step bolt head is provided at the closed end of the cavity, a female thread is provided on the inner surface of the wall, and a support member is fixed to the closed end of the cavity. and a cylindrical body screwed onto the cylindrical body and having a width substantially equal to the notch opening in the axial direction U.
a threaded body provided with a shaped groove, the notch opening and the opening of the U-shaped groove are aligned in the circumferential direction, and the closed end of the hollow portion is opposed to the head of the step bolt. After the cylindrical body and the threaded body are fitted into the step bolt, the threaded body is tightened to fix the support member to the step bolt.

[Example of idea] The drawings illustrate an embodiment of the invention.

In FIG. 1, step bolts 3 are attached to a utility pole 1 via attachment fittings 2 at predetermined intervals so as to protrude substantially horizontally.

An enlarged diameter head 4 is formed at one end of the step bolt 3, and a threaded portion 5 is formed at the other end.

This threaded portion 5 is screwed into the mounting fitting 2 and is configured to be fixed to the utility pole 1.

FIGS. 2 and 3 show a perspective view and an axial sectional view of the attachment/detachment device fixed to the step bolt 3 according to the present invention.

In these figures, a hollow portion 12 is formed in the cylindrical main body 11, one end of which is closed and the other end is open.

Furthermore, a female thread 13 is cut into the inner wall surface of the cavity 12.

The cylindrical body 11 has a hexagonal outer shape, for example, and is configured to be rotated using a predetermined tool (not shown) such as a spanner that matches the outer shape.

A notch opening 1 is formed in a part of the outer periphery of the cylindrical body 11.
4 is provided.

Width d ₁ of the straight portion 14a of this notch opening
is slightly larger than the outer diameter d of the step bolt 3, and the width _d2 of the enlarged diameter portion 14b connected to the straight portion 14a is smaller than the outer diameter D of the enlarged diameter head 4 of the step bolt 3. It has a slightly larger width.

For example, a rope support fitting 15 is fixed to the closed end of the cylindrical body 11.

As a member fixed to this closed end, when supporting an outdoor display object such as a signboard, cable slackness observation equipment, etc., which will be explained later, a mounting bolt is fixed for fixing them.

These rope support fittings, outdoor displays, mounting bolts, etc. are collectively referred to as support members in this specification.

A male thread 21 is carved on the outer periphery of the threaded body 20 to be screwed into the female thread 13 of the cylindrical body 10, and one end thereof has a hexagonal outer diameter that can be rotated with a predetermined tool. A head 22 is formed.

This screw body 20 is also provided with a U-shaped groove 23 in the axial direction, and the groove width D ₃ of the notch opening 24 of this U-shaped groove 23 is the width of the notch opening 14a of the main body 10.
It is formed approximately equal to D ₁ .

Next, the procedure for attaching the above-mentioned attaching/detaching device to the step bolt will be explained.

First, the cylindrical main body 10 and the screw body 20 are screwed together and positioned so that the notch openings 14a and 24 are aligned with each other, and in this state, the step bolt 3 is fitted.

That is, the enlarged diameter portion 14b of the cylindrical body 10 is dropped into the enlarged diameter head 4 of the step bolt 3,
The shaft portion connected to the enlarged diameter head 4 is dropped into the interior through the respective notch openings 14a and 24.

Thereafter, the screw body 20 or the cylindrical body 10 is rotated with a predetermined tool, and both are tightened together, and the step bolt 3 is expanded between the tip of the screw body 20 and the axial inner wall surface of the cylindrical body 10. They are fixed integrally by sandwiching the diameter head 4.

By doing as described above, the cylindrical body 10
The positions of the notch openings 14 and 24 in the circumferential direction relative to the screw body 20 are shifted, and the openings 1
3 and 24 are closed, the step bolt 3
The distal end of the screw body 20 and the enlarged diameter head 4 of the step bolt 3 are engaged with each other.
Extraction in the axial direction is prevented.

FIG. 4 shows an example of how the attaching/detaching device with the above structure is used. FIG. When installing, the support member 27 is fixed to the attachment/detachment device 30 and the attachment is performed.

In the cable shown in FIG. 2C, a fixing member 29 is attached via a support member 27 in order to fix a cable slackness observation device 28 used to measure cable slackness during cable installation. .

[Effects of the invention] Since the present invention is configured as described above, it becomes easy to reliably attach and remove the support member from the step bolt, thereby increasing the safety of working at heights and improving the appearance of signboards, etc. It has the advantage that outdoor display objects and cable slack measuring instruments can be easily installed.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of mounting a step bolt, FIGS. 2 and 3 show an embodiment of the attachment/detachment device of the present invention, FIG. 2 is a perspective view thereof, and FIG.
Its plan view, FIGS. 4A, B, and C, are views showing an example of the use of the above-mentioned attachment/detachment device. 3...Step bolt, 4...Enlarged diameter head, 10
... Cylindrical body, 14 ... Notch opening, 20 ... Threaded body, 24 ... Notch opening.

Claims (1)

[Scope of utility model registration request] a cavity wall with one end closed, the cavity wall having a width approximately equal to the diameter of the step bolt from the open end of the cavity to near the closed end, and approximately equal to the diameter of the head of the step bolt at the closed end of the cavity; a cylindrical body provided with a notch opening having a width, a female thread provided on the inner surface of the wall, and a support member fixed to the closed end of the cavity; and a threaded body provided with an axial U-shaped groove having a width approximately equal to After the cylindrical body and the threaded body are fitted into the step bolt so as to face the head of the step bolt, the support member can be fixed to the step bolt by tightening the threaded body. A device for attaching and detaching support members to removable step bolts.