JP6618797B2 - Retractor type fall prevention device - Google Patents

Description

The present invention relates to a retractor type fall prevention device, commonly called a safety block.

Retractor-type crash prevention devices, commonly known as safety blocks, are widely used as tools to prevent high-altitude workers from crashing.

This instrument has a rotating body (winding drum) that winds up a wire rope called a lanyard that can be pulled out inside, a spring that always gives a rotational force in the direction in which the winding drum winds up the lanyard, and the worker crashes. A rotation stopping device that stops rotation of the winding drum to prevent the worker from falling when the lanyard is pulled out abruptly.

Since malfunctions of these devices may cause injury to workers, the use of defective products must be avoided.

Currently, many safety blocks are released by many manufacturers, but none of them are intended to be self-inspected by users for internal mechanisms. Yes.

JP 2001-149490 A

The safety block used for the painting work of the transmission tower has the following problems.

That is, the first problem is adhesion or intrusion of rusty iron powder or the like. It is necessary to remove the rust that has already occurred before painting, and work to remove rusted iron powder called keren. If rusted iron powder or the like adheres to or enters the safety block due to this keren, there is a risk that the rust of the iron parts will be induced or increased, or that it will enter the rotating part and inhibit rotation.

The second problem is adhesion of paint. The safety block is attached to a steel tower member, which is the object to be painted, and is left until the work is completed. For this reason, some parts such as the wire rope of the safety block come into contact with the undried coating film on the steel tower member surface, or part of the undried paint on the steel tower member surface falls naturally due to gravity, that is, dripping It is unavoidable to adhere to the safety block body or wire rope.

There are concerns about the following abnormalities in the safety block where the paint has adhered to the internal mechanism. One is that the wire rope is wound around the winding drum while the paint attached to the wire rope is undried, and the wire rope is fixed by drying as it is, and there is a risk that the feeding will not go smoothly. .

Second, when the paint penetrates to the internal mechanism, there is a risk that the proper and reliable operation of the mechanism that prevents the crash may be hindered.

Furthermore, as a third problem, there is processing of induced voltage. In the work on the power transmission tower, it is inevitable that an induced voltage is generated from the power transmission state wire to the metal part of the safety block. In particular, since the wire rope is long, it may be possible to generate a current close to the human body sensing current.

The present invention provides the following safety block in order to solve the above problems.

In claim 1, one or more inspection windows for confirming whether or not an abnormality has occurred in the internal mechanism are provided , electrically connected to a metal wire rope or belt of the lanyard, and the ground lead wire is connectable metal part has provided retractor type fall protection device which is provided so as to be exposed from a position different from the inspection window of the case. The number of inspection windows is not limited to one, and a plurality of inspection windows may be provided, or the entire cover may be transparent.

According to a first aspect of the present invention, there is provided a retractor-type anti-falling instrument characterized in that the inspection window is equipped with a transparent lid or a lid that can be opened and closed. A transparent lid or a lid that can be opened / closed / removed is not an alternative, and a transparent lid that can be opened / closed / removed may be used.

The claim 2, when grounding the metal portion of the retractor type fall protection device, easily connectable ground lead, was prepared easily structure and provides a ground capable retractor type fall protection device.

The claim 3, the wire rope used as a lanyard, or when replacing the belt, removal of such a wire rope, a mounting easily implementable structure, the distal end a rotatable state lanyards, tip A retractor type fall prevention device moored with a bolt that penetrates the mooring hole was provided.

According to claim 4 , the rotational force generated by the spring for applying the rotational force to wind up the lanyard at all times during use, which is generated in the lanyard take-up drum, with all the lanyards pulled out can be accurately and easily stopped and fixed A retractor type fall prevention device characterized by its structure was provided.

According to the invention described in claim 1, even if foreign matter such as paint or rusted iron powder enters the inside of the safety block, it can be confirmed from the inspection window. In particular, it is possible to check at any time at the construction site if there is an inspection window by transparency lid, it can be expected to improve safety.

In some cases, the transmission tower is painted with the transmission line in the power transmission state. In this case, the metal part of the retractor-type anti-falling device , especially the metal wire rope, is subject to voltage induced by the transmission line. May occur. Since the worker may be surprised when a current is detected, it may cause a secondary disaster, so to prevent detection, connect the metal part of the retractor-type crash prevention device to a steel tower member connected to the ground and ground it. There is a need to. Therefore, the safety of workers can be improved by easily attaching the ground lead wire according to the invention of claim 2 .

According to the third and fourth aspects of the present invention, the wire rope of the lanyard can be easily replaced without completely disassembling the retractor type fall prevention device . As a countermeasure when the paint adheres to the wire rope etc., one method is to remove the coating film from the wire rope etc. using a solvent, and the other is to replace the wire rope etc. The efficiency of replacement work can be realized.

FIG. 1 is an external view showing an embodiment of a safety block provided in the present invention, and the internal structure is not shown. FIG. 2 shows an example of a structure in which a wire rope or the like can be easily replaced in the embodiment of the safety block provided by the present invention.

FIG. 1 is an embodiment of the present invention, and is an appearance of a safety block having the features of claims 1 to 4.

First, as shown in the figure, the inspection window 21 was provided with a round window at the lower left position when viewed from the front of the case 1 of the main body. This position is a position where the mechanism portion that stops the rotation of the lanyard winding cylinder that prevents the worker from falling can be seen in case of trouble.

In the embodiment, only one circular window is arranged on the front side. However, a plurality of windows may be used, and various sizes, shapes, and positions may be considered.

Next, regarding the structure of the inspection window 1, a transparent lid was installed in this embodiment. As a result, it is possible to easily check the interior of the safety block in any state, for example, at a high altitude work.

Further, the lid of the inspection window may be a lid that can be opened and closed or removed without any problem even if it is not transparent.

Next, regarding the mounting of the ground lead wire, in the embodiment, the bolt which is the mandrel of the lanyard take-up drum is taken out of the case, the ground lead wire tightening nut is added, and the ground lead wire mounting terminal 22 and did.

Lanyard wire ropes correspond to metal parts that have a relatively large induction from the transmission line and that may be contacted by workers, and a mounting terminal that can be grounded easily and reliably has been realized.

The ground lead wire is manufactured by determining the tower-side connection fitting and the lead wire length based on the request of the user who uses the safety block.

FIG. 2 shows an example of a structure in which a wire rope or the like can be easily replaced.

The ends of the wire rope 2 are processed into an eye and are anchored with bolts 32 to a winding cylinder 31 (including hooks at both ends of the cylinder).

The bolt 32 is arranged in a shape and a position that are easy to loosen or tighten.

If the wire rope is not fully pulled out from the winding drum, the wire rope cannot be replaced. However, this state is the state where the rotational force is accumulated most in the spring, so the rotation of the winding drum is stationary and fixed. It is necessary to make it.
For this reason, a shape that serves as a jig support structure and a mark such as a notch for rotation fixation on the ridge is ensured to set the rotation fixation jig.

1 Retractor-type crash prevention device (safety block) body (not shown)
2 Lanyards (wire rope or belt)
21 Inspection window 22 Ground lead wire attachment terminal 31 Lanyard take-up drum (with hook) (one of internal parts)
32 Lanyard mooring bolt 33 Lanyard take-up drum fixing jig rest (notch)

Claims (4)

A retractor type fall protection device equipped one or more of the inspection window at a position mechanism for stopping the rotation of the lanyard winding drum of the body of the case is visible,
Retractor-type anti-falling device provided such that a metal portion electrically connected to a lanyard metal wire-rope or belt is exposed from a position different from the inspection window of the case. . The metal parts, the retractor type fall protection device according to claim 1 mandrel of the run-yard winding drum is part of the bolt out to the outside of the case. As a structure in which the wire rope of the lanyard or the belt can be easily attached and detached, the lanyard is secured with a bolt penetrating the mooring hole in the tip portion so that the tip portion on the mooring side of the lanyard can be rotated. The retractor type fall prevention device according to claim 1 or 2 , which is moored on a winding drum. Rotation to pull up the lanyard at all times during use, generated in the lanyard take-up drum, with the lanyard pulled out, as a structure that allows easy attachment and removal of the lanyard wire rope or belt The retractor type fall prevention device according to claim 3 , wherein the retractable fall prevention device according to claim 3 has a structure that allows a rotational force by a spring to apply force to be accurately and easily stopped and fixed by a rotation fixing jig.

Images