Worker fall prevention system in high-place work area and worker fall prevention method in high-place work area

Abstract

The present invention provides a worker fall prevention system and method capable of reliably preventing a fall accident of a worker working in a high-place work area.　This worker fall prevention system in a high-place work area is configured such that a worker wearing a lanyard performs work while moving as appropriate between a safety area and one or more work areas. The worker fall prevention system is configured such that the worker working in the high-place work area is restricted from operating a hook of the lanyard on their own will, and the worker cannot arbitrarily operate the hook unless given permission by a supervisor on site.

Description

System for preventing workers from falling in high-altitude work areas and method for preventing workers from falling in high-altitude work areas

[0001] The present invention relates to a system for preventing workers from falling in a high-altitude work area and a method for preventing workers from falling in a high-altitude work area.

[0002] When working at heights, such as at construction sites, workers are legally required to wear fall prevention equipment. Harnesses and lanyards are commonly used as fall prevention equipment. A harness consists of at least one belt selected from a set of shoulder belts, chest belts, waist belts, pelvic belts, and thigh belts worn around the worker's body. A lanyard is a long, elongated body of an appropriate length, with a hook attached to one end thereof for engaging with a hook-receiving member, such as a handrail or lifeline. A portion of the harness is connected to the other end of the lanyard, preferably via a shock absorber. To use the fall prevention equipment, a worker working in a high-altitude work area first dons the harness to which the lanyard is connected. Then, the worker manually releases the hook release mechanism of the hook attached to the end of the lanyard, engaging the curved hook with a hook-receiving member, such as a rope, lifeline, or handrail, stretched at an appropriate location near the high-altitude work area. Then, the hook release means is manually closed to complete the connection between the hook-receiving member and the hook, allowing the worker to continue work.

[0003] To reliably prevent workers from falling from high-altitude work sites, it is essential that each worker accurately and reliably understands the content of their respective construction work standards and correctly and reliably uses the required fall prevention equipment. However, even today, accidents involving workers falling from high-altitude work sites still occur frequently. This is likely due to workers intentionally omitting the prescribed work rules and procedures based on their own judgment, or workers forgetting to perform necessary operations at some point, resulting in unsafe conditions being carried out. Furthermore, in addition to workers' lack of awareness, given the increasing size, height, and complexity of work sites, it is becoming increasingly difficult for a small number of supervisors to visually monitor each worker's work status and compliance status and provide appropriate instructions to each worker in a timely manner. This current situation supports the ongoing decline in the number of fall accidents mentioned above. In other words, a lack of mutual communication is also a major problem.

[0004] Many improvements have been proposed to address the above-mentioned problems in the prior art. For example, Patent Document 1 discloses a safety belt and a system for checking its usage status, in which a pressure sensor is provided on the hook to detect the pressure on the lanyard. Patent Document 2 discloses a lanyard and personal emergency transmitter system that measures the tension on the lanyard and transmits the results to an external device via wireless transmission means.

[0005] Patent Document 3 discloses a personal lanyard monitoring system and position confirmation method that measures strain on a lanyard and transmits the results wirelessly to an external device, allowing a supervisor to determine the physical posture of the worker (e.g., whether the worker has fallen or is hanging downward). Patent Document 4 discloses a retractable accordion-shaped lanyard equipped with two lanyards. Patent Document 5 discloses a fall prevention device with multimodal induction sensing in which appropriate sensor means are mounted on the hooks of a double lanyard to detect whether the hooks are engaged with a lifeline or handrail and transmit the results to an external device. Patent Documents 6 and 7 disclose lanyards and lanyard light-emitting devices in which a light-emitting means is provided on the lanyard or hook, and the worker activates the light-emitting means when the hook is engaged with a handrail or the like.

[0006] In addition, Patent Document 8 discloses a fall prevention device for work at heights and its installation method, which illustrates an example of a link prevention device in which one end of two rods is rotatably connected to each other, the other ends are individually fixed within the work area, and three ropes, each connected to the rotatable portion and both fixed ends, are joined within the interior area of ​​the two rods, and a lanyard is secured to this joint. Patent Document 9 also discloses a no-hallline monitoring device and a high-altitude safety support device that attaches an IC chip to a hooking device to which a lanyard hook is attached, automatically determines whether the hook is engaged with the hooking device, and transmits this information to an external management unit. Patent Document 10 also discloses a lanyard control device, method, and program that records a worker's position information by video, calculates the allowable range of lanyard length based on the position information so that the worker remains within the workable range, and instructs the lanyard reel mechanism to adjust the lanyard length based on this information. Patent document 11 also discloses a fall prevention equipment usage status monitoring device that has a pressure sensor attached to the inner curved annular portion of a hook attached to the tip of a lanyard, and transmits information to the outside as to whether the hook is engaged with the lanyard rope, main rope, handrail, etc. This information is received by an administrator, who then issues an alarm if there is no hook engagement status information while receiving specified altitude information and information indicating that work is in progress.

[0007] Furthermore, Patent Document 12 discloses an alarm system for a high-altitude work site, which comprises a base unit that is installed at the work site and transmits identification information related to the work site, and a sub-unit that is attached to the worker and receives the transmitted information from the base unit, and the sub-unit is provided with a hook detection switch unit that detects whether the hook of the lanyard is engaged or not and a function for transmitting the detection result information of the hook detection switch unit to the base unit, and when the worker is at the high-altitude work site and the hook is not engaged with the life rope or handrail, etc. Furthermore, Patent Document 13 discloses a work safety management system that photographs the work site where the worker is working to obtain site images, and then determines the usage status of the hook from the image information, based on a color image attached to the hook and a color image attached to the handrail or life rope at the site.

[0008] In addition, Patent Document 14 discloses a safety management support system in which a worker is provided with a sensor that detects the wearing and use status of a safety belt and a transmission function that transmits the detected information to an external party, and a supervisor receives the information, determines whether the worker is using the safety belt appropriately, and sounds an alarm. Furthermore, Patent Document 15 discloses a fall arrest device and safety system in which a wireless tag is attached to the hook of a lanyard carried by a worker, the wireless tag reads whether the hook is engaged with a hook holder and transmits the information to an external party, and a photographing device is provided to photograph the work site, transmits the photographed information to an external party, identifies the worker and determines their high position from the information, and sounds an alarm if the lanyard is being used improperly. Furthermore, Patent Document 16 discloses a monitoring system and hook holder for fall arrest devices in which the hook is provided with a hook attachment / detachment detection means that detects whether the hook is engaged with a handrail or lifeline and a transmission means that transmits the information to an external party, and an external supervisor analyzes the information on a monitor and notifies the worker.

[0009] In addition, Patent Document 17 discloses a double lanyard in which the opening and closing sections of each hook are configured so that when one hook is open, the other hook is closed. As mentioned above, to prevent workers from falling at high altitudes, workers are required to use a harness-type safety belt. This harness-type safety belt (hereinafter simply referred to as a safety belt) consists of multiple belts that contact the worker's shoulders, thighs, chest, or torso. For example, a lanyard with a hook is connected to a metal fitting called a D-ring attached to the safety belt. Meanwhile, the other end of the lanyard has a curved hook that can be attached to a handrail or lifeline, which are inevitably installed at high-altitude work sites. Then, a worker wearing the safety belt configured as described above hooks the hook onto a handrail installed at the high-altitude work site to perform work.

[0010] When workers move around high-altitude work sites, they must frequently attach and detach hooks to handrails or lifelines. However, many workers find it cumbersome to attach and detach hooks, so they often work at heights without using hooks. Therefore, to prevent industrial accidents, site managers and supervisors must ensure that workers use safety harnesses properly, but it is extremely difficult to constantly supervise multiple workers working at remote high-altitude work sites.

[0011] Furthermore, in remote locations, on cloudy days, or under relatively dark conditions such as at night, workers may find it difficult to confirm the position and installation status of the hook. Site supervisors may also find it difficult to visually confirm the installation status of the hook of workers working at relatively distant locations. The present inventors conducted extensive analysis and investigation into the causes of past accidents in which workers fell or fell from high-altitude work sites, and found that the primary cause was the lack of individual worker safety awareness. In particular, workers with several years of experience at high-altitude work sites tend to underestimate or ignore the dangers of working at heights due to familiarity. As a result, they consciously ignored the existence of work standards and, despite performing dangerous work in high-altitude work areas, voluntarily removed the hook from the hook-retaining member, such as a handrail or lifeline, in the high-altitude work area. It was found that a considerable number of workers fall or fall from high-altitude work sites due to this lack of safety awareness.

[0012] Japanese Patent Application Publication No. 2011-104339 Japanese Patent Application Publication No. 2013-500112 Japanese Patent Application Publication No. 2019-512123 Japanese Patent Application Publication No. 2022-90722 Japanese Patent Application Publication No. 2022-540431 Japanese Patent Application Publication No. 2024-011230 Japanese Patent Application Publication No. 2024-011225 Japanese Patent Application Publication No. 2014-140556 Japanese Patent Application Publication No. 2020- Patent Document 066111 Patent Document 7164036 Patent Document 2020-189068 Patent Document 2021-068116 Patent Document 2021-129953 Patent Document 2022-131652 Patent Document 2023-074846 Patent Document 2024-033831 Patent Document 2022-015650

[0013] Therefore, the object of the present invention was developed to reliably solve many of the problems in the prior art described above. That is, the present invention introduces a system that prohibits a worker engaged in dangerous work in a high-altitude work area from freely opening or closing the hook opening and closing means attached to the hook at his / her own will, and restricts the worker from freely opening or closing the hook at his / her own will without permission from the site manager or supervisor. The hook opening and closing means is used to open or close the hook attached to the lanyard, and is provided to introduce a hook-receiving member such as a lifeline into the hook and to eject the hook-receiving member from the hook to the outside.

[0014] In order to solve the above-mentioned problems and achieve the object, the worker fall prevention system of the present invention is a system for preventing falls in a high-altitude work area, which is configured so that a worker wearing a double lanyard can work while moving appropriately between a safety area and one or more work areas, wherein a first hook including a curved first hook portion that can be engaged with a hook engaging member made of a main rope is attached to an end of one lanyard body that constitutes the double lanyard, and a second hook including a curved second hook portion that can be engaged with a hook engaging member made of a main rope is attached to an end of the other lanyard body that constitutes the double lanyard, and the first hook is provided with a first hook opening and closing means for opening or closing the first hook in addition to the first hook portion, and the second hook is provided with a second hook opening and closing means for opening or closing the second hook in addition to the second hook portion, and the first hook opening and closing means and the second hook opening and closing means have an operating function that allows them to be operated to an open state or a closed state based on the worker's intention. and further characterized in that the first hook opening and closing means is provided with a first locking mechanism configured to block the operation function regardless of the will of the worker in response to a command signal based on the judgment of a site manager or supervisor, and the second hook opening and closing means is provided with a second locking mechanism having a function similar to that of the first locking mechanism, and when the first locking mechanism and the second locking mechanism are set to an operating state to block the operation function, the first hook opening and closing means and the second hook opening and closing means are then set to an operable state, and when one of the first hook opening and closing means or the second hook opening and closing means is then selected and operated, the other non-selected hook opening and closing means is set to an inoperable state, and when the operation is completed, the selected one hook opening and closing means is set to an inoperable state and the other non-selected hook opening and closing means is set to an operable state, and the first hook opening and closing means and the second hook opening and closing means are set to an inoperable state.

[0015] The system and method for preventing falls of workers in high-altitude work areas according to the present invention employ the novel and inventive technical configuration described above. As a result, when a worker is engaged in dangerous work in a high-altitude work area, the worker is completely prohibited from freely opening or closing the hook opening / closing means of the hook attached to the lanyard at his / her own will. This completely prevents falls or accidents caused by the worker's arbitrary actions.

[0016] FIG. 1 is a schematic diagram showing an outline of the configuration of a worker fall prevention system according to the present invention. FIG. 2 is a block diagram showing an outline of a worker fall prevention method according to the present invention. FIG. 3 is a flowchart showing an outline of the operating procedure of the worker fall prevention method according to the present invention using a single lanyard. FIG. 4 is a flowchart showing an outline of the operating procedure of the worker fall prevention method according to the present invention using a double lanyard. FIG. 5 is a diagram showing an example of the structure of a single lanyard used in the present invention. FIG. 6 is a diagram showing an example of the structure of a double lanyard used in the present invention. FIG. 7 is a diagram showing another example of the structure of a double lanyard used in the present invention. FIG. 8-1 is a flowchart showing the changes in the operable and inoperable states of the hook opening and closing means of the hook. FIG. 8-2 is a flowchart showing the changes in the operable and inoperable states of the hook opening and closing means of the hook. FIG. 9 is a diagram showing the changes in the state of the hook opening and closing means of the hook.

[0017] Hereinafter, an embodiment of a system for preventing falls of workers in high-altitude work areas and a method for preventing falls of workers in high-altitude work areas according to the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to this embodiment. Furthermore, in the specification and drawings of this application, elements that can be similarly described may be designated by the same reference numerals, and redundant description may be omitted. First, an embodiment of a system for preventing falls of workers in high-altitude work areas according to the present invention will be described with reference to Figures 1 and 2. That is, this embodiment is applicable to both conventionally known single lanyards and double lanyards.

[0018] As shown in Figure 5, a single-type lanyard has a hook 3 attached to one end 2 of a lanyard body 1, which can engage with a hook-receiving member 10, such as a handrail or lifeline, and a carabiner 5 attached to the other end 4, which can be freely connected to a predetermined location on a harness. An example of a double lanyard, as shown in Figure 6, is a pair of a lanyard body 1 having a hook 3 attached to end 2 and a lanyard body 1' having a hook 3' attached to end 2'. This double lanyard has a connecting ring 6 attached to end 4 of the lanyard body 1, and a connecting ring 6' attached to end 4' of the lanyard body 1'. The connecting rings 6, 6' are connected to a connecting ring 8 attached to the carabiner 5. Another double lanyard, as shown in Figure 7, has a hook 3 attached to one end 2 of a single lanyard body 1, and a hook 3' attached to the other end 4 of the lanyard body 1. A connecting ring 6 is attached to the approximate center of the lanyard body 1, and this connecting ring 6 is connected to a joining ring 8 attached to the carabiner 5. It is desirable to provide an energy absorbing part 7 between the carabiner 5 and the connecting ring 6, as shown in Figures 6 and 7.

[0019] First Embodiment Here, as a first embodiment, the basic technical configuration of a worker fall prevention system using a single lanyard will be described below. In the worker fall prevention system 100 of this embodiment, a lanyard body 1 has a hook 3 attached to one end 2, the hook 3 including a curved hook portion 11 that can be engaged with a hook-engaged member 10, such as a lifeline. A well-known carabiner 5 is attached to the other end 4 of the lanyard body 1. The lanyard body 1 configured in this manner is used by securing it to a connecting member, such as a harness, chest belt, or waist belt, worn by a worker 300 using the carabiner 5. In addition to the curved hook portion 11, the hook 3 is provided with a hook opening / closing mechanism 13 for opening or closing the hook 3. The hook opening / closing mechanism 13 has an on-off valve 15 for introducing the hook-engaged member 10 into the hook interior 12 and for ejecting the hook-engaged member 10 from the hook interior 12. The hook opening and closing means 13 also has an operation function that allows it to be operated to an open state or a closed state based on the will of the worker 300. In addition to this operation function, the hook opening and closing means 13 is configured so that the operation function is blocked regardless of the will of the worker 300 in response to a command signal based on the judgment of the on-site manager / supervisor 200 (so that the worker 300 can freely set the hook opening and closing means 13 to a state where it cannot be operated or controlled).

[0020] That is, in the worker fall prevention system 100 of this embodiment, the hook opening and closing means 13 of the hook 3 is basically configured to be manually operated to an open state or a closed state based on the worker 300's own will. This allows the worker 300 to introduce the hook engagement member 10 into the hook interior 12 of the hook 3 to engage and lock (hook) the hook 3 with the hook engagement member 10, or to separate (disengage) the hook 3 from the hook engagement member 10. Furthermore, in the worker fall prevention system 100 of this embodiment, a locking mechanism 16 is added to the hook opening and closing means 13. When the on-site manager 200 deems it necessary, he or she issues a command signal to activate (turn on) the locking mechanism 16, thereby stopping the operating function of the hook opening and closing means 13 and completely prohibiting the worker 300 from operating the hook opening and closing means 13 at his or her own will.

[0021] On the other hand, if the on-site supervisor 200 no longer feels the need for the operation, the restriction (stop) on the operating function by the worker 300 is lifted, and the worker 300 can freely manually operate the hook opening and closing means 13 at his or her own will. In the worker fall prevention system 100 of this embodiment, the worker 300 normally presses the press key 14 provided on the hook opening and closing means 13 to rotate the opening and closing valve unit 15 provided on the hook 3 in the forward and reverse directions as shown by the arrows (see FIG. 1 ). This action opens or closes the hook interior 12 of the hook 3, making it possible to introduce or eject the hook-engaged member 10 into or from the hook interior 12.

[0022] That is, in the worker fall prevention system 100 of this embodiment, a locking mechanism 16 is added to the hook opening and closing means 13 to restrict (block) free manual operation (operation function) by the worker 300. More specifically, the hook opening and closing means 13 is added with a locking mechanism 16 that restricts or blocks free opening and closing operation by the worker 300 based on an external command signal (control signal). In this embodiment, the external command signal is preferably a signal that is transmitted wirelessly (or via a wire) to the locking mechanism 16 by the supervisor 200 from an external supervision center 400 located away from the location of the worker 300, as necessary. In addition, it is also preferable that the locking mechanism 16 has a function to properly receive wireless command signals.

[0023] The timing when the supervisor 200 issues a command signal to activate the locking mechanism 16 to restrict or block the opening and closing operation of the hook opening and closing means 13 is preferably immediately after the worker 300 enters the safety area 500 or the work area 501, 502, 503, etc. and confirms that the hook 3 is engaged and locked with the hook-receiving member 10. The configuration of the locking mechanism 16 is not particularly limited. For example, as shown in FIG. 1 , the locking mechanism 16 is preferably provided with a drive stop device 161 directly or indirectly connected to the drive mechanism of the hook opening and closing means 13, and this drive stop device 161 is preferably driven by an electronic (electromagnetic) valve-type locking mechanism 16. More specifically, the configuration for disabling the opening and closing operation of the hook opening and closing means 13 under certain conditions is not particularly limited, and a known mechanical means can be used. For example, an electromagnetic mechanism may be used to electrically insert a stopper member into a part of the opening and closing drive mechanism of the hook opening and closing means 13.

[0024] The locking mechanism 16 preferably includes a control unit (CTR) 162 for receiving an external command signal (control signal) and controlling the drive / stop device 161 to an activated state (ON state) or a deactivated state (OFF state) in response to the command signal, and a battery unit 163. The external supervision center 400 is not particularly limited in configuration, but preferably includes, for example, a monitor unit 401, a memory unit 402, a computing unit (CPU) 403, and an information transmitting / receiving unit 404, all of which are directly and constantly managed by the supervisor 200. When the locking mechanism 16 for restricting the drive function (opening / closing operation) of the hook opening / closing means 13 is controlled by an electronic valve or solenoid valve, an electronic lock key, for example, can also be used. The electronic lock key should be designed so that it can only be used by the supervisor 200, and great care must be taken to prevent the electronic lock key from accidentally falling into the hands of the worker 300.

[0025] In this embodiment, it is preferable to provide an engagement state detection sensor 17 for detecting the engagement state between the hook portion 11 and the hook-receiving member 10 near a portion of the curved hook portion 11, specifically near the portion that directly contacts the hook-receiving member 10. Using this configuration to reliably confirm whether the hook portion 11 and the hook-receiving member 10 are in contact with each other and in an engaged state is extremely important in the worker fall prevention system 100 of this embodiment. Therefore, it is desirable to use, for example, a well-known pressure-sensitive sensor as the engagement state detection sensor 17. Information obtained by the engagement state detection sensor 17 is notified to the worker 300 or supervisor 200 by, for example, activating a light-emitting or acoustic alarm means 19 (alert function). In this embodiment, it is also preferable to provide a material information acquisition sensor 18 for detecting and acquiring information such as the material or strength of the hook-receiving member 10 engaged with the hook portion 11 near a portion of the curved hook portion 11, specifically near the portion that directly contacts the hook-receiving member 10. The information obtained by the material information acquisition sensor unit 18 can be successively transmitted to the management supervisor 200 at the external management supervision center 400 by using external transmission means (transmission function).

[0026] As described above, employing this configuration to determine whether the hook-engaged member 10 with which the hook portion 11 is engaged is a predefined, normal hook-engaged member 10 is also extremely important in the worker fall prevention system 100 of this embodiment. Therefore, by providing a material information acquisition sensor unit 18 capable of acquiring information such as the strength, material, diameter, and surface gloss of the hook-engaged member 10, this acquired information is sequentially transmitted to the supervisor 200 at the external management and supervision center 400. In other words, the worker fall prevention system 100 of this embodiment is a worker fall prevention system equipped with an engagement state detection sensor unit 17 and / or a material information acquisition sensor unit 18. The engagement state detection sensor unit 17 preferably has a notification function that notifies the detected information using optical or acoustic means. Furthermore, the material information acquisition sensor unit 18 preferably has a transmission function that transmits the detected information to the outside.

[0027] As described above, the external command signal is a signal transmitted externally by wire or wirelessly as needed by the supervisor 200 located in the external supervision center 400, which is located in a remote location separate from the safety area 500 and the work area 501 where the worker 300 is located. Next, a specific example of the worker fall prevention method in a high-altitude work area according to this embodiment will be described. First, the basic configuration of the worker fall prevention method for preventing the worker 300 working in a high-altitude work area from falling will be described in detail with reference to the drawings. FIG. 2 is a block diagram showing an outline of the worker fall prevention method according to the present invention. In this example, the behavior of the worker 300 working in a high-altitude work area is managed using the worker fall prevention system described above to prevent the worker 300 from falling.

[0028] In FIG. 2 , a start area 500 (safety area 500) is provided, and one or more work areas 501, 502, 503, etc. are connected to it. A hook-receiving member 10, such as a handrail or lifeline, is installed in each of the safety area 500 and the work areas 501, 502, 503, etc. While the hook-receiving members 10 are generally installed continuously throughout the safety area 500 and the work areas 501, 502, 503, etc., the continuity of the hook-receiving members 10 may be interrupted depending on the relative positions of adjacent areas or if there is an obstacle near the inside or outside of an area. There may be only one work area, but multiple work areas may be set depending on the work environment. In this embodiment, even if the continuity of the hook-receiving members 10 between adjacent areas is interrupted, the interval between the interruptions is assumed to be extremely short and within easy reach of both hands. In addition, in FIG. 2 , one or more external supervision centers 400 are installed at locations away from the safety area 500 and the work areas 501, 502, 503, etc., and the manager 200 is constantly stationed at this external supervision center 400 to monitor and supervise the individual activities of each worker 300. The functions of the external supervision center 400 can also be realized using a smartphone or other device carried by the manager 200, in which case the manager 200 does not need to be constantly stationed at the external supervision center 400. In addition, in FIG. 2 , only one safety area 500 is provided, but in reality, a high-altitude work area may be quite large, and the movement paths of the workers 300 may be complex. For example, if the work area is a large building, there may be a considerable distance between the work areas on the front and back sides of the building. In such cases, it is desirable to install separate safety areas 500 on the front and back sides of the building. This shortens the movement line of the worker 300, and contributes greatly to saving time and avoiding danger. In other words, Figure 2 shows various assumed cases. Next, a specific example of the basic procedure for the method of preventing a worker from falling in a high-altitude work area according to this embodiment will be described.

[0029] It is assumed that a supervisor 200 has previously discussed with one or more workers 300, who have already attached one or more (preferably two) single lanyards to some part of their body, the work content and the associated safety management procedures, and is waiting to enter a safety area 500, which is a place for safety confirmation. Even when multiple workers 300 are performing a specific work as a group, it is desirable that the supervisor 200 and each worker 300 have a prior discussion regarding the work content to be performed, the work route, etc., before entering the safety area 500. The prior discussion may also be held within the safety area 500.

[0030] In the method for preventing a worker from falling in a high-altitude work area (worker fall prevention system) of this embodiment, for example, a hook 3 including a curved hook portion 11 capable of engaging with a hook-engageable member 10, such as a lifeline or handrail, is attached to at least one end 2 of a lanyard body 1. One or more (preferably two) lanyard bodies 1 are then secured to the body of a worker 300 via a connecting member (not shown), such as a harness, chest belt, waist belt, or hip belt. In addition to the curved hook portion 11, the hook 3 is provided with a hook opening / closing means 13 for opening or closing the hook 3. The hook opening / closing means 13 has an on-off valve 15 for introducing the hook-engageable member 10 into the hook interior 12 and ejecting the hook-engageable member 10 from the hook interior 12. The hook opening / closing means 13 also has an operating function that allows the worker 300 to operate it between an open state and a closed state based on his or her will. Furthermore, in addition to this operation function, the hook opening and closing means 13 has a locking mechanism 16 configured to block the operation function regardless of the will of the worker 300 in response to a command signal based on the judgment of the on-site manager 200 (a state in which the worker 300 cannot freely operate and control the hook opening and closing means 13). After the worker 300 wearing the lanyard body 1 enters the safety area 500 and the hook portion 11 of the hook 3 is engaged with the hook engaging member 10 in the safety area 500, the manager 200 of the worker 300 has the authority to operate the hook opening and closing means 13 of the hook 3 during the period from the safety area 500 to the work area (one or more work areas as the case may be) to perform work and until the worker 300 returns to the safety area 500.

[0031] Here, a more specific procedure for implementing the method for preventing a worker from falling in a high-altitude work area according to this embodiment will be described in detail with reference to the flowchart of FIG.The method for preventing a worker from falling in a high-altitude work area of ​​this embodiment includes a step (step 1) in which a worker 300 wearing the lanyard body 1 and a supervisor 200 hold a preliminary meeting regarding the work content and the situation of the work area before starting the work, a step (step 2) instructing the worker 300 to enter a safety area 500, a step (step 3) instructing the supervisor 200 to set the locking mechanism 16 to an inactive state (OFF) after confirming that the worker 300 has entered the safety area 500, and a step (step 4) instructing the worker 300 to insert the hook portion 11 into a hook-engaged portion of the safety area 500. a step (step 4) of the supervisor 200 instructing the worker 300 to move to the work area after confirming that the hook portion 11 has been locked to the hook-received member 10 in the safety area 500; a step (step 5) of the supervisor 200 instructing the worker 300 to move to the work area; a step (step 6) of the worker 300 removing the hook portion 11 from the hook-received member 10 in the safety area 500 while moving and locking the removed hook portion 11 to the hook-received member 10 in the work area; and a step (step 7) of the worker 300 completing the movement to the work area and locking the hook portion 11 to the hook-received member 10 in the work area. a step (step 7) in which the supervisor 200 notifies the manager 200 that the movement has been completed and that the hook portion 11 has been locked, a step (step 8) in which the supervisor 200 sets the locking mechanism 16 to an activated state (ON) and instructs the worker 300 to carry out the work after confirming that the movement has been completed and that the hook portion 11 has been locked, a step (step 9) in which the worker 300 notifies the manager 200 that the work in the work area has been completed, and a step (step 10) in which the worker 300 notifies the manager 200 that the work in the work area has been completed after the locking mechanism 16 has been set to an inactivated state (OFF), the hook portion 11 is removed from the hook-locked member 10 in the work area, and is locked to the hook-locked member 10 in the safety area. The process includes a step (step 10) of notifying the supervisor 200 that the worker 300 has moved to the safety area 500, a step (step 11) of the supervisor 200 confirming that the worker 300 has returned to the safety area 500 and then instructing the worker 300 to remove the hook portion 11 from the hook-engaged member 10 in the safety area 500 while keeping the locking mechanism portion 16 in an inactive state (OFF), and a step (step 12) of the supervisor 200 confirming that the worker 300 has removed the hook portion 11 and then instructing the worker 300 to leave the safety area 500.

[0032] On the other hand, when a single-type lanyard is used, there may be cases where the hook-received member 10 in the safety area 500 and the hook-received member 10 in the work area are continuous, and in such an environment, the method for preventing a worker from falling differs from the above. Although not shown, for example, it is as follows. This method for preventing a worker from falling includes a step (step 1) in which a worker 300 wearing the lanyard body 1 and a supervisor 200 hold a preliminary meeting regarding the work content and the status of the work area before starting the required work, a step (step 2) instructing the worker 300 to enter the safety area 500, a step (step 3) in which the supervisor 200 confirms that the worker 300 has entered the safety area 500 and then sets the locking mechanism 16 to an inactive state (OFF), and a step (step 4) instructing the worker 300 to lock the hook portion 11 to the safety area 500. The process includes a step (step 4) instructing the supervisor 200 to lock the hook portion 11 to the hook-receiving member 10 in the safety area 500, a step (step 5′) instructing the worker 300 to move to the work area after the supervisor 200 confirms that the hook portion 11 has been locked to the hook-receiving member 10 in the safety area 500 and sets the locking mechanism 16 to an activated state (ON), and a step (step 6′) instructing the worker 300 to move to the work area while sliding the hook portion 11 while it is still locked to the hook-receiving member 10. 00 that the movement to the work area has been completed (step 7'); a step in which the supervisor 200 confirms the completion of the movement and then instructs the worker 300 to work in the work area (step 8'); a step in which the worker 300 works in the work area and then reports the completion of the work to the supervisor 200 (step 9'); and a step in which the worker 300 slides to move to the safety area while the hook portion 11 remains engaged with the hook-engaged member 10, and notifies the supervisor that the worker 300 has moved to the safety area 500. 200 after confirming that the worker 300 has returned to the safety area 500 (step 10'); a step (step 11') of the manager / supervisor 200 setting the locking mechanism 16 to a non-operated state (OFF) and instructing the worker 300 to remove the hook portion 11 from the hook-engaged member 10 in the safety area 500 after confirming that the worker 300 has removed the hook portion 11 (step 12);

[0033] Furthermore, in the method for preventing falls of a worker using a single lanyard (see FIG. 3), if there are multiple work areas, it is conceivable that after completing work in one work area (e.g., work area 501), worker 300 may move directly to another work area (e.g., work area 502) to continue work without returning to safety area 500. In such a case, after worker 300 notifies supervisor 200 that he has completed work in work area 501 (step 9), supervisor 200 determines whether there is another work area (step 13). That is, if it is determined that there is another work area 502 (No), the process goes through step 14 ("Number of work areas: (N) → (N-1)"), and then further goes to step 15) of instructing the worker 300 to move to another work area 502 and perform work there (it is assumed that if there is another work area, a prior meeting has been held between the manager 200 and the worker 300), a step of maintaining the lock mechanism 16 in an activated state (ON) if the hook engageable member 10 in the work area 501 and the hook engageable member 10 in the work area 502 are continuous, and a step of resetting the lock mechanism 16 to an inactivated state (OFF) if the hook engageable member 10 in the work area 501 and the hook engageable member 10 in the work area 502 are discontinuous (step 16), and a step of resetting the lock mechanism 16 to an inactivated state (OFF) if the worker 300 slides the hook portion 11 from the hook engageable member 10 in the work area 501 to the hook engageable member 10 in the work area 502. a step 17 in which the worker 300 moves while holding the hook 11 in the working area 501, or removes the hook portion 11 from the hook-receiving member 10 in the working area 501 and engages the hook portion 11 with the hook-receiving member 10 in the working area 502; a step 18 in which the worker 300 notifies the supervisor 200 that the movement to the working area 502 has been completed and the hook portion 11 has been engaged with the hook-receiving member 10 in the working area 502; After confirming that the movement has been completed and that the hook portion 11 is locked, the locking mechanism portion 16 is either maintained in the activated state (ON) or, if it is in the inactivated state (OFF), is reset to the activated state (ON), and the following steps are executed: a step 19 instructing the worker 300 to perform the work; and a step 20 in which the worker 300 notifies the supervisor 200 that the work in the work area 502 has been completed. Then, the process returns to step 13 again via step 21.

[0034] That is, as shown in FIG. 3 , steps 1 to 9 are executed sequentially. In step 9, for example, when supervisor 200 is notified that work in work area 501 has been completed, step 13 is executed to determine whether work area 501 in which work has been completed is the last work area. That is, in step 13, for example, if there are multiple (N) work areas, N-1 is calculated to determine whether N=0. If N=0, supervisor 200 determines that there is no other work area and instructs worker 300 to return to safety area 500. On the other hand, if there are multiple (N) work areas, for example, three, completion of the first work does not result in N=0, so the worker moves to another work area and repeats the same steps until the second and third work are completed. Specifically, in step 13, it is determined whether N=0 or not. If the answer is Yes, steps 10 to 12 are executed. If the answer is No, steps 14 to 21 are repeatedly executed until N=0 in step 13.

[0035] In this embodiment, it is preferable that each worker 300 sequentially transmits the work progress status or the operation status of the hook 3 to the external supervision center 400 wirelessly or via a wired connection. It is also preferable that information from the engagement state detection sensor unit 17 and the material information acquisition sensor unit 18 is also sequentially transmitted to the external supervision center 400. Furthermore, to collect relevant information, it is also preferable to install devices 20 (see FIG. 2 ) such as surveillance cameras and position sensors near the safety area 500 and work areas 501, 502, etc. to detect the individual movements of each worker 300 and transmit that information as three-dimensional information. It is also preferable to install devices (not shown) such as motion capture devices in the safety area 500 and work areas 501, 502, etc., and collect the obtained three-dimensional position information at the external supervision center 400. It is also preferable to attach personal identification tags to each worker 300, use tag reading means located in appropriate locations to collect position information of each worker 300, and transmit that information to the external supervision center 400.

[0036] Second Embodiment Next, a second embodiment of the worker fall prevention system and method for preventing falls in a high-altitude work area according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to this embodiment. Furthermore, elements that can be described in the same manner as in the first embodiment will be assigned the same reference numerals and will not be described again. In the second embodiment, a worker fall prevention system and method for preventing falls using a double lanyard (see FIGS. 6 and 7) will be described. Note that the hooks 3 and 3' used in the double lanyard both have the same structure as the hook 3 shown in FIG. 1. The configuration of the external management and supervision center 400 will also be the same as that shown in FIG. 1.

[0037] In the worker fall prevention system and method of this embodiment, a hook 3 and a hook 3' are attached to a double lanyard. The hook 3 (3') is provided with a curved hook portion 11 (11') and a hook opening and closing means 13 (13') for opening or closing the hook 3 (3'). The hook opening and closing means 13 (13') has an on-off valve portion 15 (15') for introducing the hook-receiving member 10 into the hook interior 12 (12') and ejecting the hook-receiving member 10 from the hook interior 12 (12'). The hook opening and closing means 13 (13') also has an operating function that allows it to be manually operated to an open or closed state based on the intention of the worker 300. Furthermore, in addition to this operation function, the hook opening and closing means 13 (13') is configured so that its operation function is blocked (restricted) regardless of the will of the worker 300 by the operation of the locking mechanism 16 (16') in response to a command signal based on the judgment of the on-site manager / supervisor 200 (a state in which the worker 300 cannot freely operate and control the hook opening and closing means 13 (13'). Furthermore, after the locking mechanism 16 (16') is restricted, a safety management mode, which will be described later, is applied, and both the hook opening and closing means 13 and the hook opening and closing means 13' are set to a state in which they can be operated by the worker 300. Thereafter, when the worker 300 selects and operates one of the hook opening and closing means 13 (or the hook opening and closing means 13'), the other hook opening and closing means 13' (or the hook opening and closing means 13) is set to an inoperable state, so that they cannot be operated simultaneously.

[0038] In this embodiment, the locking mechanism 16 of the hook 3 and the locking mechanism 16' of the hook 3' have substantially the same basic circuit configuration. However, because the locking mechanism 16 and the locking mechanism 16' must be driven and controlled separately, internal circuit configuration and / or software settings are required. Furthermore, identification symbols or the like that allow the hook opening and closing means 13 and the hook opening and closing means 13' to be individually and independently identified must be set. In other words, when using a double lanyard, it is necessary to set in what patterns the hook opening and closing means 13 and the hook opening and closing means 13' will be in an operable state (unlocked state) or in an inoperable state (locked state).

[0039] For example, when the operating function of the hook opening and closing means 13 of the hook 3 is set to an operable state, the operating function of the hook opening and closing means 13' of the hook 3' is set to an inoperable state. The reverse may also be possible. It is important to set both the hook opening and closing means 13 and the hook opening and closing means 13' to states that can be operated individually by the worker 300, so that the worker 300 can operate either hook (hook 3 or hook 3') at will, but cannot operate both simultaneously (first mode in safety management mode: initial setting state). In the first mode, for example, when the worker 300 selects any one of the hooks 3 and starts operating it (e.g., when performing an operation to engage the hook with the hook-receiving member 10), the other hook 3' that was not selected is immediately set to an inoperable state. Thereafter, when the worker 300 completes the operation of the hook 3, the hook 3 is immediately set to an inoperable state, and at the same time, the hook 3' is set to an operable state. Such combinations of operable and inoperable states of the hooks 3 and 3', that is, the safety management modes, are outlined in FIG. 9(B).

[0040] For example, in the safety management mode, when the worker 300 selects and operates the hook opening and closing device 13 of one of the hooks 3, the hook opening and closing device 13' of the other, non-selected hook 3' is temporarily set to an inoperable state. Thereafter, when the worker 300 completes the operation of the hook opening and closing device 13, the hook opening and closing device 13 of the hook 3 is immediately set to an inoperable state, and at the same time, the hook opening and closing device 13' of the other, non-selected hook 3' is automatically set to an operable state (second mode). On the other hand, in the safety management mode, when the worker 300 selects and operates the hook opening and closing device 13' of one of the hooks 3', the hook opening and closing device 13 of the other, non-selected hook 3 is temporarily set to an inoperable state. Thereafter, when the worker 300 completes the operation of the hook opening and closing device 13', the hook opening and closing device 13' of the hook 3' is immediately set to an inoperable state, and at the same time, the hook opening and closing device 13 of the other, non-selected hook 3 is automatically set to an operable state (third mode). Furthermore, in this embodiment, the hook opening and closing device 13 of the hook 3 and the hook opening and closing device 13' of the hook 3' can be set to a state in which both are inoperable at the same time. In this case, the safety management mode can be canceled and the locking mechanism 16 and the locking mechanism 16' can be maintained in the ON state. That is, in this embodiment, the following preferred aspects are considered. In detail, in the safety management mode, based on the judgment of the supervisor 200, control is performed to determine whether both the locking mechanism 16 and the locking mechanism 16' are activated simultaneously or individually, or whether both the locking mechanism 16 and the locking mechanism 16' are deactivated. For example, in a first form in the safety management mode, both the locking mechanism 16 of the hook 3 and the locking mechanism 16' of the hook 3' are deactivated, and a state is set in which the worker 300 can operate both the hook opening and closing device 13 and the hook opening and closing device 13'. This first mode is mainly used in the initial stage (initial setting state of safety management mode), and is characterized in that it is set so that the hook opening and closing means 13 of hook 3 and the hook opening and closing means 13' of hook 3' cannot be operated simultaneously.In contrast, in the second mode, the locking mechanism 16 of the hook 3 is inactivated and the locking mechanism 16' of the hook 3' is activated, thereby enabling the worker 300 to operate the hook opening and closing means 13 of the hook 3, while preventing the worker 300 from operating the hook opening and closing means 13' of the hook 3'. In the third mode, contrary to the second mode, the locking mechanism 16 of the hook 3 is activated and the locking mechanism 16' of the hook 3' is inactivated, thereby enabling the worker 300 to operate the hook opening and closing means 13' of the hook 3', while preventing the worker 300 from operating the hook opening and closing means 13 of the hook 3. In setting the safety management mode, the manager 200 creates an appropriate program in advance and individually manages which mode to adopt and execute in which work environment, taking into consideration the work environment and work conditions in the safety area 500 and each work area 501, 502, etc.

[0041] In this embodiment, since it is necessary to prevent the worker 300 from arbitrarily operating the hook opening and closing means 13 and the hook opening and closing means 13' at his / her own will, it is desirable to appropriately select the necessary mode from three modes (modes 1 to 3). Specifically, to realize the operating procedure of each mode, there is a method of using mechanical means or software to cause the locking mechanisms 16, 16' to perform the desired operation, but this requires an electronic circuit configuration. For example, the hook opening and closing means 13 of the hook 3 and the hook opening and closing means 13' of the hook 3' are equipped with locking mechanisms 16, 16' that receive external command signals (control signals) and individually or simultaneously restrict the opening and closing operations of the hook opening and closing means 13, 13' based on the command signals. It is desirable that these locking mechanisms 16, 16' are configured so that each component operates in response to an external signal.

[0042] In the second mode, as already explained, the worker 300 operates the hook 3 (hook opening and closing means 13) in an operable state to engage the hook portion 11 with the hook-received member 10 in the predetermined work area (including the safety area), and when this fact is confirmed, the hook 3 becomes inoperable, and at the same time, the hook 3' (hook opening and closing means 13') becomes operable. Similarly, in the third mode, the worker 300 operates the hook 3' in an operable state to engage the hook portion 11' with the hook-received member 10 in the predetermined work area (including the safety area), and when this fact is confirmed, the hook 3' becomes inoperable, and at the same time, the hook 3 becomes operable. Furthermore, regarding whether to set the hook 3 or the hook 3' so that the worker 300 cannot freely operate it, or conversely, whether to set the hook 3 or the hook 3' so that the worker 300 can freely operate it, it is desirable to consider methods such as constructing a selection system using mechanical means or setting it by a command signal using software, etc. It is also desirable to execute the control process of such locking mechanisms 16, 16' using AI technology. Note that in this embodiment, the description is based on the assumption that only one worker 300 enters the work site and only one supervisor 200 supervises him / her. However, in reality, multiple workers 300 frequently enter a single work site at the same time. Therefore, it is preferable to assign an individual identification number to each worker so that at least one supervisor 200 can manage multiple workers 300, and to enable the worker fall prevention method of this embodiment to be individually performed for each identification number.

[0043] When a double lanyard is used, the safety management mode is applied as described above. As a specific example of this safety management mode, for example, in the initial setting stage, both the hook opening and closing means 13 of hook 3 and the hook opening and closing means 13' of hook 3' are set to a state where they can be operated by the worker 300. However, hook 3 and hook 3' are set to a state where they cannot be operated simultaneously by the worker 300 (first mode). Thereafter, when the worker 300 selects and operates either hook 3 or hook 3', the selected hook 3 or hook 3' is set to a state where it can be operated, and at the same time, the unselected hook 3' or hook 3 is set to a state where it cannot be operated (second mode, third mode).

[0044] In other words, at the time of initial setting, the hook opening and closing means 13 of the hook 3 and the hook opening and closing means 13' of the hook 3' are set to a state in which they can be operated by the worker 300 (first mode), and when the worker 300 arbitrarily selects and operates either the hook 3 or the hook 3', the other hook opening and closing means 13' or the hook opening and closing means 13 that was not selected is immediately set to an inoperable state, and thereafter, when the worker 300 completes the operation, the selected hook opening and closing means 13 or the hook opening and closing means 13' is set to an inoperable state, and at the same time, the other hook opening and closing means 13' or the hook opening and closing means 13 that was not selected is set to an operable state (second mode, third mode). By applying such a safety management mode, it is possible to reliably prevent the occurrence of a serious dangerous situation in which the worker 300 simultaneously releases both hook portions 11 and 11' of the double lanyard from the hook-receiving member 10.

[0045] Here, a specific example of when the first, second, and third modes are set when software control is performed by applying the safety management mode to the locking mechanism 16, 16′ will be described below. For example, when the safety management mode is applied, the initial setting state (first mode) is basically set first. That is, when a milestone action or instruction occurs in some continuous safety measure action, specifically when an instruction is issued for the worker 300 to move from the safety area 500 to the work area 501, 502, etc., or when an instruction is issued to perform work in a specific work area, it is preferable to first adopt the initial setting state (first mode). Thereafter, when the worker 300 performs the designated work, the second and third modes are sequentially applied and executed. In this case, the order of application of the second and third modes varies depending on the movement of the worker 300. Then, when a further milestone action or instruction is given in the safety action, the system returns from the second or third mode to the first mode, which is the initial setting state, and similar safety management mode control is executed. More specifically, as the individual configurations of the hook opening and closing means 13 of the hook 3 or the hook opening and closing means 13' of the hook 3', for example, in the initial setting state when the worker 300 uses the hook portions 11, 11', the hook opening and closing means 13 or the hook opening and closing means 13' are both set to an operable state (first mode) (however, they are set so that they cannot be operated simultaneously). Then, the worker 300 selects and operates one of the selected hook opening and closing means 13 or hook opening and closing means 13' (this operation temporarily sets the other unselected hook opening and closing means 13' or hook opening and closing means 13 to an inoperable state), and when the hook portion 11 or hook portion 11' is removed from the hook engageable member 10 and engaged with a hook engageable member 10 in another work area, the hook opening and closing means 13 or hook opening and closing means 13' selected and operated by the worker 300 is set to an inoperable state, and at the same time, the unselected hook opening and closing means 13' or hook opening and closing means 13 (which was previously in an inoperable state) is re-set to an operable state.Thereafter, when the worker 300 operates the hook opening and closing means 13' or the hook opening and closing means 13, which has now become operable, to remove the hook portion 11' or the hook portion 11 from the hook engageable member 10 and engage it with a hook engageable member 10 in another work area, the hook opening and closing means 13' or the hook opening and closing means 13, which was in an operable state, is again set to an inoperable state, and at the same time, the hook opening and closing means 13 or the hook opening and closing means 13', which was set to an inoperable state, is set to an operable state, and the same operations are repeated thereafter.

[0046] As a method for realizing the above-described method for preventing a worker from falling, as described above, it is possible to use a mechanical method or to set up an appropriate program and implement it using software. In the method for preventing a worker from falling according to this embodiment, when the worker 300 moves from a predetermined area (e.g., the safety area 500) to another area (e.g., the work area 501), it is desirable to leave room for the worker 300 to arbitrarily select the hook 3 or hook 3' that allows the worker 300 to move most simply and easily, taking into consideration environmental conditions such as the environment of each area, the position and arrangement of the hook engageable members 10, and whether or not there are obstacles in the tensioning path of the hook engageable members 10. In that sense, between the safety area 500 and the work area 501, or in cases where there are multiple work areas (work areas 501, 502, etc.), there is no particular problem if the hook engageable members 10 stretched between each area are formed continuously, but if the hook engageable members 10 are discontinuous or if there is some kind of obstacle near the hook engageable members 10, it is desirable to actively use a double lanyard.

[0047] Next, a method for preventing a worker's fall using a double lanyard to reliably prevent a worker 300 from falling or falling off a platform will be described with reference to FIG. 4 . Here, a method for preventing a worker's fall using a double lanyard (see FIG. 6 ) will be described. The double lanyard includes two lanyard bodies (1, 1′): a lanyard body 1 having a hook 3 attached to one end 2 thereof, the hook 3 including a curved hook portion 11 that can be engaged with a hook-receiving member 10; and a lanyard body 1′ having a hook 3′ attached to one end 2′, the hook 3′ including a curved hook portion 11′ that can be engaged with a hook-receiving member 10. In this method for preventing a worker's fall, the lanyard bodies 1, 1′ are secured to a connecting member (not shown) such as a harness, waist belt, chest belt, or hip belt worn by the worker 300. The hooks 3, 3′ are provided with curved hook portions 11, 11′, as well as hook opening and closing mechanisms 13, 13′ for opening and closing the hooks 3, 3′. The hook opening and closing means 13, 13' has an on-off valve unit 15, 15' for introducing the hook-received member 10 into the hook interior 12, 12' and discharging the hook-received member 10 from the hook interior 12, 12'. The hook opening and closing means 13, 13' also has an operation function that allows it to be manually operated to an open state or a closed state based on the will of the worker 300. In addition to this operation function, the hook opening and closing means 13, 13' has a locking mechanism unit 16, 16' that is configured to block the operation function regardless of the will of the worker 300 in response to a command signal based on the judgment of the on-site manager / supervisor 200 (a state in which the worker 300 cannot freely operate and control the hook opening and closing means 13, 13'). In the method for preventing a worker from falling using a double lanyard, the locking mechanism 16, 16' is configured to control the operating function of the hook opening and closing means 13, 13' to a specific state (safety management mode, i.e., a state in which the opening and closing operation of the hook opening and closing means 13, 13' is controlled by the manager / supervisor 200).4, the method for preventing falls of a worker using a double lanyard first involves a step (step 30) in which a worker 300 wearing lanyard bodies 1, 1' and a supervisor 200 discuss the work content and the conditions of the work area before starting the work, and a step (step 31) in which the locking mechanisms 16, 16' are set to the inactive state (OFF state) and the worker 300 is instructed to enter the safety area 500.

[0048] Next, after the manager 200 confirms that the worker 300 has entered the safety area 500, the manager 200 instructs the worker 300 to engage the hook portion 11 of the hook 3 and the hook portion 11' of the hook 3' with the hook engageable member 10 stretched in the safety area 500 (step 32). After the manager 200 confirms the engaged state of the hook portions 11, 11' by the worker 300, the manager 200 sets the locking mechanism portions 16, 16' to an activated state (ON state) and then sets the safety management mode to an initial setting state (first mode) (step 33) (at this stage the hook opening and closing means 13, 13' are operable), and the manager 200 instructs the worker 300 to move to the work area 501 (step 34). Next, if the hook-receiving member 10 is in a continuous state, the worker 300 moves from the safety area 500 to the working area 501 while sliding the hook portions 11, 11' along the hook-receiving member 10. Then, the worker 300 notifies the manager / supervisor 200 that the movement from the safety area 500 to the working area 501 is complete (step 35-1). On the other hand, if the hook-receiving member 10 is in a discontinuous state, the worker 300 selects and operates either the hook opening and closing means 13 of the hook 3 or the hook opening and closing means 13' of the hook 3', whichever is operable, to remove the hook portion 11 or the hook portion 11' from the hook-receiving member 10 in the safety area 500 (in this state, the other hook opening and closing means 13' or the hook opening and closing means 13 that was not selected is set to an inoperable state). The worker 300 then engages the removed hook portion 11 or the hook portion 11' with the hook-receiving member 10 in the working area 501. When this operation is completed, the selected hook opening and closing means 13 or hook opening and closing means 13' is set to an inoperable state, and at the same time, the other hook opening and closing means 13' or hook opening and closing means 13 that was not selected and set to an inoperable state is set to an operable state.Thereafter, the worker 300 selects and operates the other hook opening and closing means 13' or hook opening and closing means 13 that has newly become operable, and removes the hook portion 11' or hook portion 11 from the hook-engaged member 10 in the safety area 500 (the hook opening and closing means 13 or hook opening and closing means 13' that has been set to an inoperable state remains in an inoperable state). The worker 300 then engages the removed hook portion 11' or hook portion 11 with the hook-engaged member 10 in the work area 501. Upon completion of this operation, the other hook opening and closing means 13' or hook opening and closing means 13 that has been set to an operable state is set to an inoperable state, and at the same time, the hook opening and closing means 13 or hook opening and closing means 13' that has been set to an inoperable state is set to an operable state. In other words, when the hook-engaged member 10 is in a discontinuous state, the re-engagement of the hooks 3, 3' is always performed with one of the hooks engaged with the hook-engaged member 10. When the hook portion 11 and the hook portion 11' are completely engaged with each other, the worker 300 notifies the supervisor 200 that the movement from the safety area 500 to the work area 501 has been completed (step 35-2).

[0049] Next, in the method for preventing a worker from falling using a double lanyard, the supervisor 200, after confirming the completion of movement and the locked state of the hooks 3, 3', instructs the worker 300 to work in the work area 501 (when this instruction is given, the safety management mode has returned to the initial setting state (first mode)) (step 36), and the worker 300 performs the work, completes the work, and then notifies the supervisor 200 of the completion of the work (step 37). Thereafter, when the supervisor 200 instructs the worker 300 to return from the work area 501 to the safety area 500 (not shown), if the hook-engaged member 10 is in a continuous state, the worker 300 moves from the work area 501 to the safety area 500 while sliding the hook portions 11, 11' along the hook-engaged member 10. The worker 300 then notifies the supervisor 200 of the completion of the movement from the work area 501 to the safety area 500 (step 38-1). On the other hand, when the hook engaging member 10 is in a discontinuous state, the worker 300 selects and operates one of the hook opening and closing means 13 of the hook 3 and the hook opening and closing means 13' of the hook 3' that is in an operable state, and removes the hook portion 11 or the hook portion 11' from the hook engaging member 10 in the work area 501 (in this state, the other unselected hook opening and closing means 13' or hook opening and closing means 13 is set to an inoperable state). The worker 300 then engages the removed hook portion 11 or hook portion 11' with the hook engaging member 10 in the safety area 500. When this operation is completed, the selected hook opening and closing means 13 or hook opening and closing means 13' is set to an inoperable state, and at the same time, the other unselected hook opening and closing means 13' or hook opening and closing means 13 that was set to an inoperable state is set to an operable state. The worker 300 then selects and operates the other hook opening and closing means 13' or hook opening and closing means 13 that has now become operable, and removes the hook portion 11' or hook portion 11 from the hook-engaged member 10 in the work area 501 (the other hook opening and closing means 13 or hook opening and closing means 13' that has been set to an inoperable state remains in an inoperable state).Then, the worker 300 engages the detached hook portion 11' or hook portion 11 with the hook-engaged member 10 in the safety area 500. When this operation is completed, the other hook opening and closing means 13' or hook opening and closing means 13 that was in an operable state is set to an inoperable state, and at the same time, the one hook opening and closing means 13 or hook opening and closing means 13' that was set to an inoperable state is set to an operable state. In other words, when the hook-engaged member 10 is in a discontinuous state, the re-engagement of the hooks 3, 3' is always performed with one of the hooks engaged with the hook-engaged member 10. When the engagement of the hook portion 11 and the hook portion 11' is completed, the worker 300 notifies the supervisor 200 that the movement from the work area 501 to the safety area 500 has been completed (step 38-2). Next, in the method for preventing a worker from falling using a double lanyard, the manager 200, after confirming movement to the safety area 500, returns the locking mechanism parts 16, 16' to the inactive state (OFF) and then instructs the worker 300 to remove the hook parts 11, 11' from the hook-receiving member 10 in the safety area 500 (step 39) (at this stage, the safety management mode is released and both hooks 3, 3' are set to an operable state), and after confirming that both hooks 3, 3' have been removed from the hook-receiving member 10 in the safety area 500, the manager 200 executes the step of instructing the worker 300 to leave the safety area 500 (step 40).

[0050] On the other hand, in the case of a method for preventing a worker from falling using a double lanyard, in a case where there are multiple work areas (work areas 501, 502, etc.), for example, when the worker 300 finishes work in work area 501, he or she may move directly to work area 502 to continue work without returning to safety area 500. In such a case, it is determined whether work area 501 where the work is completed is the last work area (step 41). For example, if the answer is Yes, it is determined that work area 501 is the last work area, and the processing from step 38 onwards described above is executed. On the other hand, if the answer is No in step 41, another work area (e.g., work area 502) exists, and therefore the number of work areas (N) is decremented by one, i.e., "N-1" (step 42). Then, the worker moves from work area 501 to another work area 502 (step 43) in the same manner as steps 34 and 35 described above. Specifically, when the hook-received members 10 are in a continuous state, the manager 200 instructs the worker 300 to move from the working area 501 to the working area 502 (not shown), and when the hook-received members 10 are in a continuous state, the worker 300 moves from the working area 501 to the working area 502 while sliding the hook portions 11, 11' along the hook-received members 10. Then, the worker 300 notifies the manager 200 that the movement from the working area 501 to the working area 502 has been completed (step 43-1). On the other hand, when the hook-engaged member 10 is in a discontinuous state, the worker 300 selects and operates one of the hook opening and closing means 13 of hook 3 and the hook opening and closing means 13' of hook 3' that is in an operable state, and removes the hook portion 11 or the hook portion 11' from the hook-engaged member 10 in the working area 501 (in this state, the other hook opening and closing means 13' or the hook opening and closing means 13 that was not selected is set to an inoperable state). Then, the worker 300 engages the removed hook portion 11 or the hook portion 11' with the hook-engaged member 10 in the working area 502.When this operation is completed, the selected hook opening and closing means 13 or hook opening and closing means 13' is set to an inoperable state, and at the same time, the other hook opening and closing means 13' or hook opening and closing means 13 that was not selected and set to an inoperable state is set to an operable state. Thereafter, the worker 300 selects and operates the other hook opening and closing means 13' or hook opening and closing means 13 that is now in an operable state, and removes the hook portion 11' or hook portion 11 from the hook-received member 10 in the work area 501 (the hook opening and closing means 13 or hook opening and closing means 13' that was set to an inoperable state remains in an inoperable state). The worker 300 then engages the removed hook portion 11' or hook portion 11 with the hook-received member 10 in the work area 502. Upon completion of this operation, the other hook opening and closing means 13' or hook opening and closing means 13 that was in an operable state is set to an inoperable state, and simultaneously, the hook opening and closing means 13 or hook opening and closing means 13' that was set to an inoperable state is set to an operable state. The safety management mode is then returned to the initial setting, and the operator 300 is again able to operate the hook opening and closing means 13, 13'. That is, when the hook engaging member 10 is in a discontinuous state, the re-engagement of the hooks 3, 3' is performed with one of the hooks always engaged with the hook engaging member 10. Once the hook portion 11 and the hook portion 11' are engaged, the operator 300 notifies the supervisor 200 that the movement from the work area 501 to the work area 502 is complete (step 43-2). After the supervisor 200 confirms the movement to the work area 502, he instructs the operator 300 to begin work in the work area 502 (steps 44 and 45). In this method for preventing workers from falling, steps 37 to 45 are repeatedly executed until N=0, that is, until work in all work areas is completed.

[0051] For example, in step 41, if there are multiple (N) work areas, the calculation "N-1" is performed and it is determined whether the result is "N=0." If "N=0," it is determined that no other work areas exist, and the worker 300 returns to the safety area 500. On the other hand, if there are multiple (N) work areas, for example, three, the calculation "N-1" does not result in "N=0" when the first work is completed, and the existence of another work area is confirmed. Therefore, the number of work areas (N) is decremented (N → N-1), and the worker moves to the new work area and executes the processing from step 43 onwards. Thereafter, it is determined again in step 41 whether "N=0" exists. If the result is Yes, the processing from step 38 onwards is executed. On the other hand, if the result is No, steps 37 to 45 are repeatedly executed until N=0, i.e., until work in all work areas is completed.

[0052] Next, in a method for preventing a worker from falling using a double lanyard (when the hook-receiving member 10 is in a discontinuous state), the operation of the locking mechanisms 16, 16', which control the opening and closing of the hook opening and closing means 13, 13', when set to the safety management mode, i.e., the individual state changes of the hooks 3 and 3' and their operating procedures, will be described in detail with reference to Figures 8-1, 8-2, 8-3, 9, etc. Specifically, the worker 300 enters the safety zone 500 (step ST1), the locking mechanisms 16 and 16' are set to their activated (ON) states, and the safety management mode is then set to its initial setting (first mode) (step ST2). An instruction is then issued to lock the hooks 3 and 3' to the hook-receiving member 10 in the safety zone 500 (step ST3), and it is determined whether the worker 300 has selected either the hook 3 or the hook 3' (step ST4). For example, if the answer is Yes, the selected hook 3 or hook 3' is operated by the worker 300 (the other unselected hook 3' or hook 3 is set to an inoperable state), and the hook portion 11 of the hook 3 or the hook portion 11' of the hook 3' is locked to the hook locking member 10 in the safety area 500 (step ST5). Note that, upon completion of the operation, the initially selected hook 3 or hook 3' is set to an inoperable state, and instead, the other unselected hook 3' or hook 3 is set to an operable state.

[0053] Then, it is determined whether the other hook 3' or hook 3, which has been set to an operable state, has been selected (step ST6). If the result is Yes, the selected other hook 3' or hook 3 is operated by the worker 300 (the other hook 3 or hook 3' that has not been selected is set to an inoperable state), and the hook portion 11' of the hook 3' or the hook portion 11 of the hook 3 is engaged with the hook-engaged member 10 in the safety area 500 (step ST7). Note that, upon completion of the operation, the next selected other hook 3' or hook 3 is set to an inoperable state, and instead, the unselected hook 3 or hook 3' is set to an operable state. After that, after the engagement state of the hook 3 and the hook 3' with the hook-engaged member 10 is confirmed (step ST8), an instruction is issued to the worker 300 to move from the safety area 500 to the work area 501 (step ST9), an operation is performed to return the safety management mode to the initial setting state (step ST10), and simultaneously, the worker 300 starts moving to the work area 501. Thereafter, as the worker 300 moves from the safety area 500 to the work area 501, the switching operation of the hook portion 11 and the hook portion 11' is started. It is determined whether the hook 3 or the hook 3' that is set to an operable state at this time has been selected (step ST11). If the determination is Yes, the selected hook 3 or the hook 3' is operated by the worker 300 (the other hook 3' or the hook 3 that was not selected at this time is set to an inoperable state), the hook portion 11 of the hook 3 or the hook portion 11' of the hook 3' is detached from the hook-receiving member 10 in the safety area 500, and the detached hook portion 11 or the hook portion 11' is engaged with the hook-receiving member 10 in the work area 501 (step ST12). Note that, upon completion of the operation, the hook 3 or the hook 3' that was initially selected is set to an inoperable state, and instead, the other unselected hook 3' or the hook 3 is set to an operable state.Thereafter, it is determined whether the other hook 3' or hook 3, which is set to an operable state at this time, has been operated (step ST13). If the determination is Yes, the selected other hook 3' or hook 3 is operated by the worker 300 (the other hook 3 or hook 3' that was not selected at this time is set to an inoperable state), the hook portion 11' of the hook 3' or the hook portion 11 of the hook 3 is detached from the hook-engaged member 10 in the safety area 500, and the detached hook portion 11' or hook portion 11 is engaged with the hook-engaged member 10 in the work area 501 (step ST14). Note that, upon completion of the operation, the next selected other hook 3' or hook 3 is set to an inoperable state, and instead the unselected hook 3 or hook 3' is set to an operable state. Note that, if the determination results in steps ST4, ST6, ST11, and ST13 are No, the determination process is repeatedly executed.

[0054] Thereafter, an instruction is issued to the worker 300 to work in the work area 501 (step ST15), and an operation is executed to return the safety management mode to the initial setting state (first mode) (step ST16). Thereafter, the worker 300 notifies the manager 200 that the work in the work area 501 has been completed (step ST17), and further an instruction is issued to the worker 300 to return to the safety area 500 (step ST18). At this point, the safety management mode is maintained in the initial setting state. Thereafter, as the worker 300 moves from the work area 501 to the safety area 500, the hook portion 11 and the hook portion 11' are switched in the same manner as in steps ST11 to ST14, with one of the hooks always engaged with the hook-engaged member 10. After this operation is completed, the manager 200 confirms that the worker 300 has returned to the safety area 500, cancels the safety management mode, and then instructs the worker 300 to remove the hooks 3, 3' from the hook-engaged member 10 in the safety area 500 and leave the safety area 500 (step ST19).

[0055] Next, a case where there are multiple work areas in the method for preventing a worker from falling using a double lanyard will be described with reference to FIG. 8-2. For example, in step ST20 of FIG. 8-1, it is determined whether work area 501(N) is the last work area (N=0). If the result is Yes, the process proceeds to step ST18 and subsequent steps. If the result is No, the number of work areas (N) is decremented (N→N-1) (step ST21), an instruction is issued to the worker 300 to move to a new work area (N-1) (step ST22), and the safety management mode is reset to the initial setting (step ST23).

[0056] Thereafter, it is determined whether one of the hooks 3 or 3' that is set to an operable state at this point has been selected (step ST24), and if the result is Yes, the selected hook 3 or hook 3' is operated by the worker 300 (the other hook 3' or hook 3 that was not selected at this time is set to an inoperable state), the hook portion 11 of the hook 3 or the hook portion 11' of the hook 3' is detached from the hook-receiving member 10 in the work area 501, and the detached hook portion 11 or hook portion 11' is engaged with the hook-receiving member 10 in the work area 502 (step ST25). Note that, upon completion of the operation, the hook 3 or hook 3' that was initially selected is set to an inoperable state, and instead the other unselected hook 3' or hook 3 is set to an operable state. Thereafter, it is determined whether the other hook 3' or hook 3, which is set to an operable state at this time, has been operated (step ST26). If the result is Yes, the selected other hook 3' or hook 3 is operated by the worker 300 (the other hook 3 or hook 3' that was not selected at this time is set to an inoperable state), the hook portion 11' of the hook 3' or the hook portion 11 of the hook 3 is detached from the hook-engaged member 10 in the work area 501, and the detached hook portion 11' or hook portion 11 is engaged with the hook-engaged member 10 in the work area 502 (step ST27). Note that, upon completion of the operation, the other hook 3' or hook 3 selected next is set to an inoperable state, and instead, the unselected hook 3 or hook 3' is set to an operable state. Thereafter, an instruction is issued to the worker 300, who has completed the movement, to perform work in the work area 502 (step ST28), and an operation is performed to return the safety management mode to the initial setting state (step ST29). Thereafter, the worker 300 performs the work in the work area 502, and after completing the work, notifies the manager 200 that the work in the work area 502 has been completed (step ST30). Note that if the judgment result in the above steps ST24 and ST26 is No, the judgment process is repeated.

[0057] The present invention is not limited to the above-described embodiments. The above-described embodiments are merely examples, and any other configurations that are substantially identical to the technical ideas described in the claims and that provide similar effects are included within the technical scope of the present invention.

[0058] DESCRIPTION OF SYMBOLS 1, 1' Lanyard body 2, 2' End portion 3, 3' Hook 4, 4' End portion 5 Carabiner 6, 6' Connecting ring 7 Energy absorption portion 8 Coupling ring 10 Hook engagement member 11, 11' Hook portion 12, 12' Hook interior 13, 13' Hook opening / closing means 14 Press key 15, 15' Opening / closing valve portion 16, 16' Locking mechanism portion 17 Engagement state detection sensor portion 18 Material information acquisition sensor portion 19 Notification means 20 Equipment 100 Worker fall prevention system 161 Drive stop device 162 Control portion (CTR) 163 Battery portion 200 Supervisor 300 Worker 400 External supervision center 401 Monitor portion 402 Memory portion 403 Calculation means (CPU) 404 Information transmitting and receiving means 500 Starting area (safety area) 501, 502, 503... Working area

Claims

1. A fall prevention system for workers in high-altitude work areas, configured so that a worker wearing a double lanyard can work while moving appropriately between a safety area and one or more work areas, wherein a first hook including a curved first hook portion that can be engaged with a hook-receiving member made of a main rope is attached to the end of one lanyard body constituting the double lanyard, and a second hook including a curved second hook portion that can be engaged with a hook-receiving member made of a main rope is attached to the end of the other lanyard body constituting the double lanyard, and in addition to the first hook portion, the first hook is provided with a first hook opening and closing means for opening or closing the first hook, and in addition to the second hook portion, the second hook is provided with a second hook opening and closing means for opening or closing the second hook, and the first hook opening and closing means and the second hook opening and closing means have an operating function that allows them to be operated to an open state or a closed state based on the worker's intention, a worker fall prevention system for use in a high-altitude work area, characterized in that: the first hook opening and closing means is provided with a first locking mechanism configured to block the operation function regardless of the worker's will in response to a command signal based on the judgment of a site manager or supervisor; and the second hook opening and closing means is provided with a second locking mechanism having a function similar to that of the first locking mechanism; when the first locking mechanism and the second locking mechanism are set to an activated state that blocks the operation function, the first hook opening and closing means and the second hook opening and closing means are then set to an operable state; when one of the first hook opening and closing means or the second hook opening and closing means is then selected and operated, the other non-selected hook opening and closing means is set to an inoperable state; when the operation is completed, the selected one hook opening and closing means is set to an inoperable state, and the other non-selected hook opening and closing means is set to an operable state; and the first hook opening and closing means and the second hook opening and closing means are set to be unable to be operated simultaneously.

2. The system for preventing falls of workers in high-altitude work areas described in claim 1, characterized in that the hook portion is provided with an engagement state detection sensor portion that detects the engagement state between the hook portion and the hook-received member, and further the hook portion is provided with a material information acquisition sensor portion that detects and acquires the material or strength of the hook-received member that is in an engaged state with the hook portion.

3. The system for preventing falls of workers in high-altitude work areas described in claim 2, characterized in that the engagement state detection sensor unit has an alarm function of notifying the detected result information using optical or acoustic means, and the material information acquisition sensor unit has a transmission function of transmitting the detected result information to the outside.

4. A method for preventing falls for workers in high-altitude work areas, comprising two lanyard bodies, one of which has a first hook attached to the end thereof, the first hook including a curved first hook portion that can be engaged with a hook-receiving member made of a main rope, and the other of which has a second hook attached to the end thereof, the second hook including a curved second hook portion that can be engaged with a hook-receiving member made of a main rope, and the other ends of the two lanyard bodies are connected to the worker's body via a predetermined connecting member, and the worker wearing the double lanyard is configured to work while moving appropriately between a safety area and one or more work areas, wherein the first hook is provided with a first hook opening and closing means for opening or closing the first hook, and the second hook is provided with a second hook opening and closing means for opening or closing the second hook, and each hook opening and closing means has a structure for introducing the hook-receiving member into the interior of the hook and for ejecting the hook-receiving member from the interior of the hook, the first hook opening and closing means and the second hook opening and closing means have an operation function that allows them to be operated to an open state or a closed state based on the will of the worker, and further, the first hook opening and closing means is provided with a first locking mechanism configured to block the operation function regardless of the will of the worker in response to a command signal based on the judgment of a site manager or supervisor, and the second hook opening and closing means is provided with a second locking mechanism having a function similar to that of the first locking mechanism, when a system is used in which the first locking mechanism and the second locking mechanism are set to an operating state that blocks the operation function, a safety management mode is then applied, and in the safety management mode, the first hook opening and closing means and the second hook opening and closing means are set to an initial setting state in which they are operable, and thereafter, when one of the first hook opening and closing means or the second hook opening and closing means is selected and operated, a second state is entered in which the other non-selected hook opening and closing means is set to an inoperable state,Thereafter, when the operation is completed, a third state is entered in which the selected one of the hook opening and closing means is set to an inoperable state and the other unselected hook opening and closing means is set to an operable state, and the first hook opening and closing means and the second hook opening and closing means are set to be inoperable simultaneously. A method for preventing workers from falling in a high-altitude work area, characterized in that 5. The method for preventing workers from falling in a high-altitude work area described in claim 4, characterized in that the safety management mode continues until the first locking mechanism unit and the second locking mechanism unit are set to an inactive state in which the block is released.

6. The method for preventing workers from falling in a high-altitude work area according to claim 4, characterized in that after the operation of both the first hook opening and closing means and the second hook opening and closing means is completed, the initial setting state is restored.

7. A process in which the worker wearing the double lanyard and the supervisor hold a preliminary meeting regarding the work content and the status of the work area before starting work; a process in which the first locking mechanism and the second locking mechanism are set to the inactive state and the supervisor instructs the worker to enter the safety area; a process in which the supervisor confirms that the worker has entered the safety area and then instructs the worker to engage the first hook portion and the second hook portion with the hook engaging member; a process in which the supervisor confirms the engaged state by the worker and then sets the first locking mechanism and the second locking mechanism to the active state and then sets the safety management mode to the initial setting state; a process in which the supervisor instructs the worker to move to the work area; a step of transferring the first hook and the second hook from the hook engaging member in the safety area to the hook engaging member in the work area in sequence, with either one of the hooks always engaged with either of the hook engaging members, and notifying the supervisor that the movement has been completed after both the first hook and the second hook have been engaged with the hook engaging member in the work area; a step of the supervisor confirming the completion of the movement and then instructing the worker to work in the work area; a step of the worker notifying the supervisor of the completion of the work after the work has been completed; and a step of the supervisor instructing the worker to return from the work area to the safety area. a step of transferring the first hook and the second hook from the hook-receiving member in the work area to the hook-receiving member in the safety area in sequence, with either one of the hooks always being engaged with either of the hook-receiving members, and notifying the supervisor that the movement has been completed after both the first hook and the second hook have been engaged with the hook-receiving member in the safety area; and a step of the supervisor, after confirming the movement to the safety area, returning the first locking mechanism and the second locking mechanism to the inoperative state and instructing the worker to remove the first hook portion and the second hook portion from the hook-receiving member in the safety area.and after the supervisor confirms that the first hook and the second hook have been removed from the hook-receiving members in the safety area, instructing the worker to leave the safety area. The method for preventing falls in a high-altitude work area according to claim 4, further comprising the steps of: in the initial setting state, the worker selects and operates one of the first hook and the second hook, thereby transitioning to the second state, removing the selected one of the hooks from the hook-receiving members to which it is currently attached, and engaging the removed one of the hooks with the hook-receiving members to which it is to be replaced; thereafter, in the second state, the worker selects and operates the other of the first hook and the second hook, thereby transitioning to the third state, removing the selected other of the hooks from the hook-receiving members to which it is currently attached, and engaging the removed other of the hooks with the hook-receiving members to which it is to be replaced; and thereafter transitioning to the initial setting state.

8. A process in which the worker wearing the double lanyard and the supervisor hold a preliminary meeting regarding the work content and the status of the work area before starting the work; a process in which the first locking mechanism and the second locking mechanism are set to the inactive state and the supervisor instructs the worker to enter the safety area; a process in which the supervisor confirms that the worker has entered the safety area and then instructs the worker to engage the first hook portion and the second hook portion with the hook engaging member; a process in which the supervisor confirms the engaged state by the worker and then sets the first locking mechanism and the second locking mechanism to the active state and then sets the safety management mode to the initial setting state; a process in which the supervisor instructs the worker to move to the work area; a step in which the worker moves from the safety area to the work area while sliding the first hook portion and the second hook portion along the hook engaging member, and notifies the supervisor 200 of the completion of the movement from the safety area to the work area, or sequentially switches the first hook and the second hook from the hook engaging member in the safety area to the hook engaging member in the work area with one of the hooks always engaged with one of the hook engaging members, and notifies the supervisor of the completion of the movement after both the first hook and the second hook are engaged with the hook engaging member in the work area; a step in which the supervisor confirms the completion of the movement and then instructs the worker to work in the work area; a step in which the worker notifies the supervisor of the completion of the work after completing the work; and a step in which the supervisor instructs the worker to return from the work area to the safety area.a step in which the worker moves from the work area to the safety area while sliding the first hook portion and the second hook portion along the hook-receiving member, and notifies the supervisor 200 of the completion of the movement from the work area to the safety area, or sequentially switches the first hook and the second hook from the hook-receiving member in the work area to the hook-receiving member in the safety area with one of the hooks always engaged with one of the hook-receiving member, and notifies the supervisor of the completion of the movement after both the first hook and the second hook are engaged with the hook-receiving member in the safety area; and a step in which the supervisor, after confirming the movement to the safety area, returns the first locking mechanism and the second locking mechanism to the inoperative state and instructs the worker to remove the first hook portion and the second hook portion from the hook-receiving member in the safety area. and after the supervisor confirms that the first hook and the second hook have been removed from the hook-receiving members in the safety area, instructing the worker to leave the safety area. The method for preventing falls in a high-altitude work area according to claim 4, further comprising the steps of: in the initial setting state, the worker selects and operates one of the first hook and the second hook, thereby transitioning to the second state, removing the selected one of the hooks from the hook-receiving members to which it is currently attached, and engaging the removed one of the hooks with the hook-receiving members to which it is to be replaced; thereafter, in the second state, the worker selects and operates the other of the first hook and the second hook, thereby transitioning to the third state, removing the selected other of the hooks from the hook-receiving members to which it is currently attached, and engaging the removed other of the hooks with the hook-receiving members to which it is to be replaced; and thereafter transitioning to the initial setting state.

9. The method for preventing workers from falling in a high-altitude work area according to claim 8, further comprising the steps of: after the step of the worker notifying the supervisor that the work has been completed, determining whether the work area in which the work has been completed is the last work area; and if there is another work area, the step of the worker moving from the current work area to the other work area while sliding the first hook portion and the second hook portion along the hook engaging members and notifying the supervisor 200 that the move from the current work area to the other work area has been completed; or, sequentially switching the first hook and the second hook from the hook engaging members of the current work area to the hook engaging members of the other work area with one of the hooks always engaged with one of the hook engaging members, and notifying the supervisor that the move has been completed after both the first hook and the second hook have been engaged with the hook engaging members of the other work area.

Images