JP7808417B2 - Fall prevention equipment - Google Patents

Description

The present invention relates to a fall prevention device that prevents bolts and nuts from falling when assembling structures using bolts and nuts.

Patent Documents 1 and 2 describe fall prevention devices that prevent bolts and nuts from falling when working at heights such as on steel towers.

In Patent Document 1, magnets are used to attract and hold the flat surface of the bolt head and the side of the nut, and a safety cord is used to attach the tool to a tool bag or harness, preventing the bolts and nuts from falling during work.

On the other hand, in Patent Document 2, the bolt and nut are held in a blind hole so that they cannot rotate, and are attached to the worker's body or surrounding structures using a coil wire.

Patent No. 5424839 Patent No. 4654226

However, as in Patent Document 1, while attaching bolts and nuts to a tool bag or harness with a safety cord can prevent them from falling, there are issues with the holding part and safety cord swinging after the attachment work has been completed, interfering with the work, or the holding part sticking to steel towers and the like.

Meanwhile, Patent Document 2 discloses a configuration in which the hanging part is attached to a wristband, which is unlikely to get in the way of work or get stuck to steel towers or the like, as in Patent Document 1. However, once the fastening work with the bolt and nut is complete, the holding part hangs down from the wristband. This causes the holding part to swing around every time the hand is moved, which is annoying, and there is also the possibility that it may get caught on structures, which could even be dangerous.

The present invention was made in consideration of the above circumstances, and its purpose is to provide a fall prevention device that can improve workability and safety.

The fall prevention device according to the present invention comprises a pair of first and second wrist belts to be worn on the left and right wrists of a worker, first and second suspenders, one end of each of which is connected to the first and second wrist belts, a first holding part connected to the other end of the first suspender and which magnetically attracts and holds the head of a bolt, a second holding part connected to the other end of the second suspender and which magnetically attracts and holds the underside of the seat of a nut, and a first attracting and fixing part provided on the first wrist belt and which magnetically attracts and fixes the first holding part. and a second attracting and fixing part that is provided on the second wrist belt and attracts and fixes the second holding part by magnetic force , wherein the first holding part comprises a first magnet and a first bolt holding member that is interposed between the first magnet and the head of the bolt and is made of a magnetic material and into which the head of the bolt is fitted, and the second holding part comprises a second magnet and a nut holding member that is interposed between the second magnet and the back surface of the seat of the nut and is made of a magnetic material and into which the nut is fitted , thereby solving the above-mentioned problem.

According to the above configuration, the first and second holding parts can be attracted to and secured to the first and second suction securing parts of the first and second wrist belts, respectively, so that the first and second holding parts can be secured after the installation work. Moreover, by providing the bolt holding member and the nut holding member, when tightening the bolt and nut, the bolt and nut can be tightened by rotating the bolt holding member and the nut holding member, improving workability.

This prevents the first and second holding parts from swinging around and getting in the way after work, and also prevents them from getting caught on structures. Furthermore, when it's time to install the next bolt or nut, the first and second holding parts can be removed from the first and second suction fixing parts, and the bolt and nut can be attached to them, respectively, allowing for continuous work.

Furthermore, the above-mentioned problem is solved by further providing first and second swivels that are provided between the first and second holding parts and the first and second hanging cords, at the intermediate portions of the first and second hanging cords, or at the joints of the first and second hanging cords with the wrist belt, and that remove twists in the first and second hanging cords.

By providing the first and second swivels, when the first and second holding parts are rotated to tighten the bolt and nut, twisting and tangling of the first and second hanging cords due to rotation can be avoided, and the work of removing twists is also unnecessary.

In addition, the above-mentioned problem is also solved by further providing first and second take-up reels that are respectively provided on the first and second hanging cords and that wind up the first and second hanging cords when the first and second holding parts are held by the first and second suction and fixing parts, respectively.

By providing first and second take-up reels and winding up the first and second hanging cords that hang down in a loop when the first and second holding parts are held by the first and second suction and fixing parts, respectively, slack in the hanging cords is eliminated, preventing the hanging cords from getting caught on workers or structures, thereby improving work safety.

In addition, the first and second hanging cords are each an elastic safety cord, which also solves the above-mentioned problem.

By using an elastic safety cord for the first and second hanging cords, when the first and second holding parts are held by the first and second suction fixing parts, respectively, the slack in the first and second hanging cords is reduced, preventing the hanging cords from getting caught on workers or structures, thereby improving work safety.

Therefore, the present invention provides a fall prevention device that improves workability and safety.

1 is a perspective view showing a schematic configuration of a fall prevention device according to an embodiment of the present invention. 2 is a perspective view showing the operation of fastening a bolt and a nut using the fall prevention device shown in FIG. 1. FIG. 10 is a perspective view for explaining another example of the configuration of the first and second suction and fixing units. FIG. FIG. 10 is a perspective view for explaining still another example of the configuration of the first and second suction and fixing units. 10A and 10B are perspective views for explaining modified examples of the first and second holding portions.

Below, an embodiment of the present invention will be described with reference to the drawings.

Figure 1 shows the general configuration of a fall prevention device according to an embodiment of the present invention. This fall prevention device is composed of a pair of first and second wrist belts (also called wristbands or wrist straps) 11, 12, first and second hanging cords 13, 14, first and second holding parts 15, 16, and first and second suction and fixing parts 17, 18.

The first and second wrist belts 11, 12 are worn on the worker's left and right wrists, respectively. In this example, flat belt fittings 11a, 12a are provided at one end of the belt-shaped belt, and the other end is folded back through the flat belt fittings 11a, 12a and fastened to the belt body using hook-and-loop fasteners 11b, 12b, etc.

One end 13a, 14a of each of the first and second hanging cords 13, 14 is connected to the first and second wrist belts 11, 12. The other ends 13b, 14b of each of the first and second hanging cords 13, 14 are provided with first and second holders 15, 16.

The first retaining portion 15 is formed from a button-shaped magnet and uses magnetic force to attract and hold the head of the bolt. The second retaining portion 16 is also formed from a button-shaped magnet and uses magnetic force to attract and hold the backside of the nut seat. Because the first and second retaining portions 15, 16 have the same shape, the nut can be held in the first retaining portion 15 and the bolt in the second retaining portion 16, depending on the ease of operation and the position and arrangement of the bolt and nut to be fastened.

The first suction-fixing portion 17 is provided on the side of the first wrist belt 11 and is made of a plate-shaped magnetic material, such as an iron plate. The first holding portion 15 is attracted to and fixed to this first suction-fixing portion 17 by magnetic force. The second suction-fixing portion 18 is provided on the side of the second wrist belt 12 and is made of a plate-shaped magnetic material, such as an iron plate. As shown by the two-dot chain line, the second holding portion 16 is attracted to and fixed to this second suction-fixing portion 18 by magnetic force.

Figure 2 shows the process of tightening a bolt and nut using the fall prevention device shown in Figure 1. The first wrist belt 11 is worn on the left wrist 100, and the second wrist belt 12 is worn on the right wrist 110. The head of the bolt 10a is magnetically attracted and held by the first holding part 15, and the backside of the seat of the nut 10b is magnetically attracted and held by the second holding part 16. In this state, the first and second holding parts 15, 16 or the bolt 10a and nut 10b are rotated with the fingertips of both hands to tighten them.

If necessary, a washer can be attached to the nut 10b and placed between the bolt 10a and the nut 10b.

Next, with the bolt 10a and nut 10b locked, the first holding portion 15 is removed from the head of the bolt and fixed by suction to the first suction fixing portion 17, and the second holding portion 16 is removed from the nut and fixed by suction to the second suction fixing portion 18.

Then, using tools such as spanners and various wrenches, tighten the bolt 10a and nut 10b to the required torque.

Next, the first holding portion 15 is detached from the first suction-fixing portion 17, and the head of another bolt 10a is magnetically attracted and held there, and the second holding portion 16 is detached from the second suction-fixing portion 18, and the back surface of the seat of the nut 10b is magnetically attracted and held there.

In this state, use the fingertips of both hands to rotate and lock the first and second holding parts 15, 16 or the bolt 10a and nut 10b, and then use a tool to tighten the bolt 10a and nut 10b to the required torque.

Then repeat the same tightening process.

Figures 3(a) and (b) show other configuration examples of the first suction and fixation part 17. While Figure 1 shows a plate-shaped example, as shown in Figure 3(a), this configuration has a ring-shaped storage part 17b formed on the plate-shaped part 17a. This storage part 17b may be made of either a magnetic or non-magnetic material.

Then, as shown in Figure (b), the first holding portion 15 is housed and fixed by suction to the plate-shaped portion 17a.

The second suction and fixation part 18 has a similar configuration.

Figures 4(a) and (b) show yet another example configuration of the first suction and fixation part 17. While Figure 1 shows a plate-shaped example, as shown in Figure 4(a), a columnar protrusion 17c is formed on the plate-shaped part 17a. This protrusion 17c may be made of either a magnetic or non-magnetic material.

Then, as shown in Figure (b), the annular first holding portion 15a is inserted into the protrusion 17c and fixed by suction to the plate-shaped portion 17a.

The second suction and fixation part 18 has a similar configuration.

Even with the configurations shown in Figures 3 and 4, the first and second holding portions 15, 16 can be fixed by magnetic attraction, just as in Figure 1.

Figure 5 shows a modified example of the first holding part 15. A first swivel 19 is provided between the first holding part 15 and the first hanging cord 13. Although not shown, a second swivel is provided between the second holding part 16 and the second hanging cord 14.

Then, use the fingertips of both hands to rotate and lock the first and second holding parts 15, 16 or the bolt 10a and nut 10b, and use a tool to tighten the bolt 10a and nut 10b to the required torque.

The first and second swivels rotate freely as shown by the arrows even when the first and second holding parts 15, 16 (bolt 10a, nut 10b) rotate, preventing the rotational movement from being transmitted to the first and second hanging cords 13, 14.

In Figure 5, the first and second swivels are provided between the first and second holding parts 15, 16 and the first and second hanging cords 13, 14, but they may also be provided in the middle of the first and second hanging cords 13, 14 or at the joints between the first and second hanging cords 13, 14 and the wrist belts 11, 12.

The configuration shown in Figure 5 prevents the first and second hanging cords 13, 14 from twisting or tangling when tightening the bolt 10a and nut 10b, eliminating the need for work to remove twists.

The present invention is not limited to the above-described embodiments and modifications, and can be implemented in various ways without departing from the spirit of the invention.

For example, first and second take-up reels may be provided to wind up the first and second hanging cords 13 and 14, respectively, when the first and second holding portions 15 and 16 are held by the first and second suction and fixing portions, respectively.

When the first and second holding parts 15, 16 are held by the first and second suction and fixation parts, respectively, the first and second hanging cords 13, 14, which hang down in a loop, are wound up by the first and second take-up reels, eliminating slack in the hanging cords and preventing them from getting caught on workers or structures, thereby improving work safety.

An extendable safety cord can also be used as the first and second hanging cords 13, 14.

Even when using an extendable safety cord, the slack in the first and second hanging cords 13, 14 can be reduced, preventing the first and second hanging cords 13, 14 from getting caught on workers or structures, thereby improving work safety.

Furthermore, the first retaining portion 15 can be composed of a first magnet and a first bolt retaining member made of a disk-shaped magnetic material that is interposed between the first magnet and the head of the bolt and into which the bolt head is fitted, and the second retaining portion 16 can be composed of a second magnet and a nut retaining member made of a disk-shaped magnetic material that is interposed between the second magnet and the back surface of the nut seat and into which the nut is fitted.

With this configuration, by interposing the bolt holding member and nut holding member, the bolt and nut can be tightened by rotating the bolt holding member and nut holding member, improving workability. The bolt holding member and nut holding member can be made easier to rotate with the fingertips by enlarging the outer shapes of the first and second holding portions 15, 16 or by providing grooves or checkering on the outer periphery, improving workability.

10a...Bolt 10b...Nut 11, 12...First and second wrist belts 11a, 12a...Flat belt fittings 11b, 12b...Hook-and-loop fasteners 13, 14...First and second hanging cords 13a, 14a...One end of the first and second hanging cords 13b, 14b...Other end of the first and second hanging cords 15, 16...First and second holding portions 17, 18...First and second suction fixing portions 17a...Plate-shaped portion 17b...Accommodating portion 17c...Protrusion portion 19...First swivel 100...Left wrist 110...Right wrist

Claims (4)

a pair of first and second wrist belts to be worn on the left and right wrists of the worker, respectively;
first and second suspension straps, one end of each of which is connected to the first and second wrist belts;
a first holding part connected to the other end of the first hanging cord and magnetically attracting and holding the head of the bolt;
a second holding portion connected to the other end of the second hanging cord and configured to magnetically attract and hold the back surface of the seating surface of the nut;
a first attracting and fixing portion provided on the first wrist belt and configured to attract and fix the first holding portion by magnetic force;
a second attracting and fixing portion provided on the second wrist belt, which attracts and fixes the second holding portion by magnetic force ;
A fall prevention device characterized in that the first retaining portion comprises a first magnet and a first bolt retaining member formed of a magnetic material that is interposed between the first magnet and the head of the bolt and into which the head of the bolt is fitted, and the second retaining portion comprises a second magnet and a nut retaining member formed of a magnetic material that is interposed between the second magnet and the back surface of the seat of the nut and into which the nut is fitted . 2. The fall protection device according to claim 1, further comprising first and second swivels provided between the first and second holding portions and the first and second hanging cords, at intermediate portions of the first and second hanging cords, and at the joints of the first and second hanging cords and the wrist belts, to remove twists in the first and second hanging cords. 2. A fall prevention device as described in claim 1, further comprising first and second take-up reels provided on the first and second hanging cords, respectively, for winding up the first and second hanging cords, respectively, when the first and second holding parts are held by the first and second suction fixing parts, respectively. 2. The fall prevention device according to claim 1, wherein the first and second hanging cords are each an elastic safety cord.