Safety net mounting jig

Abstract

For example, in renovation work such as the repair of a station roof, a safety net can be easily installed without erecting scaffolding, thereby reducing the additional labor required for preparing scaffolding materials, assembling and dismantling scaffolding, and shortening the time required for installing and removing the safety net, thereby allowing more time to be allocated to the actual renovation work. [Solution] The jig body is characterized by comprising a pair of hook portions whose tips are movable to expand and close, and a movable portion that expands and closes the pair of hook portions; a lifting rod that holds the jig body and lifts it to the height of the mounting body; and an operating member connected to the jig body that has been lifted to the height of the mounting body, which operates the movable portion to expand and close the pair of hook portions and attach the jig body to the mounting body.

Description

Technical Field

[0001] The present invention relates to a mounting jig, and particularly to a safety net mounting jig. For example, in the construction of the upper structure of a station, when installing a safety net to prevent workers from falling, it relates to a safety net mounting jig that can install and remove the safety net from the platform without building a scaffold.

Background Art

[0002] For example, in the construction of renovating the upper structure of a station, when workers are working on the upper structure, a safety net is installed directly below the upper structure to ensure the safety of the workers in case they accidentally fall from the upper structure, and elaborate safety measures are taken to ensure reliable protection.

[0003] Here, the construction work such as renovating the upper structure of a station is mainly carried out at night from after the last train until before the first train. Therefore, the safety net must be installed before the start of the construction work and removed after the completion of the construction work. That is, the work including the installation and removal of the safety net must be completed from after the last train until before the first train. [[ID=2​​​​​​​​​​Furthermore, when erecting scaffolding, there was the challenge of having to secure manpower for the assembly and dismantling of the scaffolding in addition to the labor required for the actual renovation work.

[0007] As mentioned above, since the renovation work on the roofs must be carried out mainly at night, between the last train and the first train, safety nets must be installed before the start of the work and removed after the work is completed. In other words, the work, including the installation and removal of safety nets, must be completed between the last train and the first train.

[0008] As mentioned above, it is conceivable to leave the safety nets permanently installed during the actual renovation work, but in that case, there have been cases where the safety nets have come loose and scattered due to strong winds, etc., so currently, we have no choice but to install and remove them each time the actual work is carried out.

[0009] Moreover, when safety nets are installed directly beneath the platform, they are often attached to the platform's beams (steel materials such as H-shaped, L-shaped, or C-shaped beams). In particular, if the tip of the platform extends beyond the platform onto the tracks, scaffolding must be erected on the tracks, and the preparation, assembly, and dismantling of the scaffolding materials significantly reduces the time available for construction work. Furthermore, when erecting scaffolding, it was necessary to secure manpower while taking into account the labor required for scaffolding assembly and dismantling, as well as the time saved on construction work. [Prior art documents] [Patent Documents]

[0010] [Patent Document 1] Japanese Patent Publication No. 2011-174267 [Overview of the Initiative] [Problems that the invention aims to solve]

[0011] The present invention was devised to solve the aforementioned conventional problems, and aims to provide a safety net attachment jig that allows for easy attachment of safety nets without the need to erect scaffolding during construction work such as the renovation of station canopies, thereby reducing the additional labor required for preparing scaffolding materials, assembling and dismantling scaffolding, and further shortening the time required for attaching and removing safety nets, thereby allowing for more time to be spent on the actual renovation work.

[0012] The present invention provides a safety net mounting jig that can be attached to beams of various shapes using only the lifting rod 11, allows the hook portion of the mounting jig to be attached to the beam with the rope for attaching the safety net already attached on the station platform, allows the safety net to be easily stretched by pulling the rope which is the operating member, and has excellent effects such as having a load capacity of 100 kg or more with just one hook portion. [Means for solving the problem]

[0013] The present invention comprises a jig body having a pair of hook portions whose tips are movable to expand and close, and a movable portion that expands and closes the pair of hook portions; a lifting rod that holds the jig body and lifts it to the height of the mounting body; and an operating member connected to the jig body lifted to the height of the mounting body, which operates the movable portion to expand and close the pair of hook portions and attach the jig body to the mounting body. It is characterized by the following: or The jig body comprises a pair of hook portions whose tips are movable to expand and close, and a movable portion that expands and closes the pair of hook portions; a lifting rod that holds the jig body and lifts it to the height of the mounting body; an operating member connected to the jig body lifted to the height of the mounting body, which operates the movable portion to expand and close the pair of hook portions and attach the jig body to the mounting body; and a safety net installation means having one end as a safety net and the other end connected to the jig body, which can be operated from the other end to position the safety net at a predetermined height. It is characterized by the following: [Effects of the Invention]

[0014] According to the present invention, for example, in construction work such as the renovation of a station roof, a safety net can be easily installed without erecting scaffolding, thereby reducing the additional labor required for preparing scaffolding materials, assembling and dismantling scaffolding, and significantly shortening the time required for installing and removing the safety net, thereby providing excellent effects that allow sufficient time to be secured for the actual renovation work.

[0015] In other words, the present invention provides a safety net mounting jig that allows the mounting jig and the safety net connected to the mounting jig to be attached to beams of various shapes using only the lifting rod 11, allows the hook portion which serves as the locking part to be attached to the beam with the rope for attaching the safety net already attached to the mounting jig on the station platform, allows the safety net to be easily stretched by pulling the rope for attaching the safety net, and moreover, provides a safety net mounting jig that has excellent effects such as having a load capacity of 100 kg or more with just one hook portion of the mounting jig.

[0016] Therefore, in station roof construction, safety nets to prevent workers from falling can be quickly and easily installed and removed from the station platform without the need to erect scaffolding. Furthermore, the labor required for preparing, assembling, and dismantling scaffolding components can be significantly reduced. In addition, the risk of falls during scaffolding assembly and dismantling can be eliminated, greatly improving safety. Moreover, by shortening the time required for installing and removing safety nets, sufficient time can be secured for the actual renovation work. [Brief explanation of the drawing]

[0017] [Figure 1] This is an explanatory diagram (1) illustrating the schematic configuration of a safety net mounting jig according to the present invention. [Figure 2] This is an explanatory diagram (2) illustrating the schematic configuration of the safety net mounting jig according to the present invention. [Figure 3]It is an explanatory diagram (3) for explaining the schematic configuration of the safety net mounting jig according to the present invention. [Figure 4] It is an explanatory diagram (4) for explaining the schematic configuration of the safety net mounting jig according to the present invention. [Figure 5] It is an explanatory diagram (5) for explaining the usage state of the safety net mounting jig according to the present invention. When the lifting rod 11 is retracted from the extended state with the fingers pinched as shown in the figure, if the operation is performed in the state where it is extended by about 120 mm, it is possible to prevent injury caused by the operator's fingers being pinched. [Figure 6] It is an explanatory diagram (6) for explaining the usage state of the safety net mounting jig according to the present invention. [Figure 7] It is an explanatory diagram (7) for explaining the usage state of the safety net mounting jig according to the present invention. [Figure 8] It is an explanatory diagram (8) for explaining the usage state of the safety net mounting jig according to the present invention. [Figure 9] It is an explanatory diagram (9) for explaining the usage state of the safety net mounting jig according to the present invention.

Mode for Carrying Out the Invention

[0018] Hereinafter, the safety net mounting jig of the present invention will be described based on the embodiments shown in the drawings.

[0019] As understood from FIG. 1, reference numeral 1 indicates a hook portion composed of a pair of hook pieces 2. The hook portion 1 composed of the pair of hook pieces 2 is formed to be curved so as to bulge outward, and a substantially circular space is formed at the center of the hook portion 1.

[0020] Further, the pair of hook pieces 2 are pivotally supported by a rotation pin 3 at a substantially intermediate position in the longitudinal direction thereof, and a first pivot portion 4 is formed, so that both tip ends of the both hook pieces 2 can be expanded and closed movably.

[0021] Furthermore, when the tips of the pair of hook pieces 2 are joined together to form a closed state, as described above, a closed, approximately circular space is created inside.

[0022] Furthermore, a movable part 5 is formed below the first pivot support 4, which is configured by a link mechanism or the like, and is capable of expanding and closing both ends of the pair of hook pieces 2.

[0023] The movable part 5 is configured as follows: The movable part 5, which consists of a link mechanism, comprises a pair of hook pieces 2 that are pivotally supported by a first pivot 4 at approximately the midpoint in the longitudinal direction, and the lower portions of the pair of hook pieces 2 from approximately the midpoint in the longitudinal direction onward extend outwards to the left and right, with the lower ends of both extended hook pieces 2 pivotally connected to the ends of a pair of link pieces 7 to form a second pivot 8, and the lower ends of the pair of link pieces 7 pivotally connected by a third pivot 9.

[0024] Therefore, as can be seen from Figure 1, a roughly rhomboid link mechanism is formed by the lower portions of the pair of hook pieces 2 from approximately the midpoint in the longitudinal direction and the pair of link pieces 7. Furthermore, an expandable / contractable member 16, such as a spring member, is attached between the two second pivot points 8 to reduce the distance between the two second pivot points 8, and normally the tips of the pair of hook pieces 2 are joined together in a closed state, i.e., a closed state.

[0025] The jig body 12 is constructed with the hook piece 2 and link piece 7 having the configuration described above.

[0026] Furthermore, a cylindrical receiving bracket 10 is attached to the lower part of the third axis support 9, and by fitting the tip of the lifting rod 11 into the hollow part of the receiving bracket 10, the lifting rod 11 can be operated to lift the jig body 12 to a mounting point 13 such as a beam at a higher position, thereby lifting the jig body 12 to a high position.

[0027] In this case, it is preferable that the lifting rod 11 be constructed to be extendable and retractable by connecting multiple rods so that it can extend and retract in the longitudinal direction.

[0028] Furthermore, reference numeral 14 denotes a rope-like operating member, the tip of which is attached and locked to a mounting portion 15 located at an intermediate position on the jig body 12, that is, near the first pivot 4. Therefore, when this operating member 14 is pulled downwards, the movable part 5 of the link mechanism moves with the third pivot 9 as the pivot point, shortening the vertical distance between the first pivot 4 and the third pivot 9. Also, the distance between the second pivots 8 widens.

[0029] As a result, the space between the tips of the pair of hook pieces 2 expands, creating a gap between the tips of the opposing hook pieces 2. This gap is used to clamp and grip the mounting point 13, such as a beam. After clamping and gripping, when the operating member 14 is loosened, the expandable member 16, which is made of the spring or the like, moves and reduces the distance between the pair of second pivot supports 8. As a result, the pair of hook pieces 2 move closer together, overlap, and close. Therefore, the jig body 12 can be securely attached to the mounting point 13, such as a beam.

[0030] Incidentally, the aforementioned mounting bracket 10 is attached near the third axis support 9, and a U-shaped bracket 17 is attached to the upper end of this mounting bracket 10, and a ring 18 with an openable and closable gate is attached to the U-shaped bracket 17. A rope clamp 19 is attached to the ring 18 with the openable and closable gate. The rope clamp 19 has an automatic brake stop function used in mountaineering, rock climbing, etc.

[0031] Furthermore, a rope 20 for attaching the safety net 23 is wound around and attached to the rope clamp 19. However, if the safety net 23 and the rope 20 are tied directly together, the attachment strength will vary depending on how the worker ties the knot. Therefore, a ring 18 with an openable and closable gate is attached to the end of the rope 20, and the safety net 23 is attached via this ring 18 with the openable and closable gate.

[0032] The rope 20 for attaching the safety net is wound around the rope clamp 19 in the direction in which the automatic brake engages, and the rope 20 connected to the safety net 23 is wound around it. Furthermore, since the rope clamp 19 can pull the rope 20 wound in the opposite direction to the direction in which the automatic brake engages, after attaching the jig body 12 by engaging the hook part 1, which consists of a pair of hook pieces 2, with an attachment point 13 such as a beam of the upper structure, the safety net 23 can be lifted up to directly below the upper structure by pulling the rope 20, and the safety net 23 can be installed in the predetermined position.

[0033] After lifting the safety net 23 to the designated position directly below the shelter, the automatic brake of the rope clamp 19 keeps the safety net 23 in place and prevents it from sliding down. Furthermore, even if a worker were to fall and their weight were to be placed on the installed safety net 23, the automatic brake stop of the rope clamp 19 would activate, protecting the worker.

[0034] Furthermore, the brake release mechanism of the rope clamp 19 is provided with a separate rope clamp release rope 24, which can be released, for example, from the station platform. When removing the safety net 23, the brake release mechanism of the rope clamp 19 is activated by pulling the rope clamp release rope 24 downwards from the platform, and the safety net 23 is lowered to the platform by its own weight. In addition, it is desirable that the rope clamp release rope 24 be made of a warning color such as tiger stripe, red, or yellow so that it can be distinguished from the other rope 20 to prevent another worker from accidentally pulling it after the safety net has been installed.

[0035] Furthermore, if the safety net 23 does not come down even when the rope clamp release rope 24 is pulled downwards, a safety net hook 21 is attached to a ring 18 with an openable and closable gate that is mounted on the lowest section of the lifting rod 11. By removing the safety net hook 21 from the ring 18 with the openable and closable gate and attaching it to the tip of the lifting rod 11, the safety net 23 can also be lowered using the lifting rod 11.

[0036] Next, we will explain the operation of attaching or detaching the hook portion 1 to or from the mounting position 13, such as a beam located at a high position, by expanding and closing the tips of the pair of hook pieces 2.

[0037] As described above, the mounting jig according to the present invention is composed of a hook portion 1 whose two ends open and close, a lifting rod 11 that can extend the jig body 12 equipped with the hook portion 1 to the height of the mounting position of the superstructure, i.e., the mounting location 13 such as a beam, and a rope clamp 19 for stretching the safety net 23.

[0038] As described above, the hook portion 1 is formed by a movable portion 5 equipped with a link mechanism, which allows both ends of the pair of hook pieces 2 to open and close, creating a space that can be attached to the beams (steel materials such as H-shaped, L-shaped, or C-shaped) of the superstructure.

[0039] The width of the pair of hook pieces 2 that make up the hook section 1, when both ends are open, is wide enough to pass through the gap (approximately 38 mm) between the roofing material and the beam of the superstructure. Furthermore, it is formed to be narrow while ensuring strength.

[0040] Furthermore, a substantially cylindrical receiving fitting 10 is attached to the lower end of the hook portion 1 to receive the tip of the extendable lifting rod 11 and connect the jig body 12 and the lifting rod 11. By gripping the lifting rod 11 and pulling down the rope-like operating member 14 attached near the first pivot 4, the tips of the pair of hook pieces 2 on the hook portion 1 can be opened to the left and right.

[0041] Then, when the tension of the operating member 14 is released at a position where the open pair of hook pieces 2 can grip the mounting point 13, such as the beam of the upper structure, the force of the retractable member 16, which is made up of a spring or the like and attached to the movable part 5 having a link mechanism, causes the tips of the pair of hook pieces 2 to close, gripping and locking onto the mounting point 13, such as the beam of the upper structure.

[0042] In this case, it is desirable to apply an anti-slip treatment to the parts of both ends of the hook portion 1 that come into contact with the mounting points 13 such as the beams of the upper structure.

[0043] Furthermore, when the lifting rod 11 is extended with the jig body 12 having the hook portion 1 attached to the tip of the lifting rod 11, or when the lifting rod 11 is extended to remove the jig body 12 attached to the mounting point 13 such as the beam of the upper structure, the weight of the jig body 12 may cause the lifting rod 11 to swing from side to side. Therefore, it is desirable to attach a rubber cover 22 to the outside of the hook portion 1 to prevent damage.

[0044] After the pair of hook pieces 2 grip the beam of the upper structure, i.e., the mounting point 13, the jig body 12 and rope clamp 19 remain on the mounting point 13 of the upper structure, and the lifting rod 11 can be reused at another mounting location.

[0045] At this time, even if the operating member 14 is pulled while the lifting rod 11 is detached from the receiving bracket 10 of the jig body 12, the link mechanism of the movable part 5 does not act in the direction of opening both ends of the pair of hook pieces 2.

[0046] Furthermore, the lifting rod 11 should preferably be made of aluminum, extendable in four stages, and be at least 5 meters long in order to achieve both strength and lightness. However, this is not limited to this, as long as it reaches the mounting height of the upper structure, and it is also acceptable to extend it further by using extension rods.

[0047] Preferably, a tapered fitting is attached to the tip of the lifting rod 11 so as to facilitate insertion into the hollow part of the receiving fitting 10. A ring 18 with an openable and closable gate is attached directly below the tapered fitting, and the operating member 14, which serves as the rope for opening and closing the hook portion 1, is passed through the ring 18 with the openable and closable gate. This configuration allows the tip of the lifting rod 11 to be easily inserted into the receiving fitting 10 even from a distance, such as from the station platform to the roof.

[0048] By the way, if you try to extend the lifting rod 11 with the jig body 12 attached to its tip, there is a risk that your hand may accidentally touch the jig body 12, causing it to detach from the lifting rod 11. Therefore, it is desirable to have the tip of the lifting rod 11 extended to about 120 mm beforehand for easier operation. Also, when retracting the lifting rod 11 from its extended state, if it is operated with the rod extended to about 120 mm, it is possible to prevent injuries to the worker's fingers from getting caught.

[0049] Similarly, to prevent injuries caused by pinching the worker's fingers, it is desirable that the extension and retraction of the lifting rod 11 from the tip onward be possible in increments of, for example, 120 mm.

[0050] Thus, for example, when installing a safety net 23 to prevent workers from falling during construction of a station roof, the safety net 23 can be quickly and easily installed from the station platform without the need to erect scaffolding, and can also be easily removed. This reduces the labor required for preparing, assembling, and dismantling scaffolding components, eliminates the risk of falls during scaffolding assembly and dismantling, and improves safety. Furthermore, it is possible to save time on construction work by shortening the time required for installing and removing the safety net 23. Moreover, it can be attached to beams of various shapes, and by using the lifting rod 11, the mounting jig can be installed with just one component.

[0051] Furthermore, with the rope 20 for attaching the safety net already attached to the jig body 12, for example on the station platform, the hook portion 1, consisting of a pair of hook pieces 2 of the jig body 12, can be attached to a beam, and the safety net 23 can be easily stretched within the station premises by pulling the operating member 14, which is made of rope or the like.

[0052] Furthermore, since the hook portion 1 of a single jig body 12 has a load capacity of 100 kg or more, the minimum number of jig bodies 12 used to stretch the safety net 23 is sufficient. [Explanation of symbols]

[0053] 1. Hook part 2 hook pieces 3 rotation pins 4 First axis branch 5 Moving parts 7 Link Pieces 8 Second axis branch 9 Third axis branch 10 Mounting bracket 11 Lifting rod 12. Jig body 13 Installation locations 14 Operating Member 15 Mounting part 16 Expandable members 17 U-shaped bracket 18 Ring with a gate that can be opened and closed 19 Rope Clamp 20 ropes 21. Hooks for attaching safety nets 22 Rubber cover 23 Safety Net 24 Rope clamp release rope

Claims

1. The jig body comprises a pair of hook portions whose tips are movable to expand and close, and a movable portion that expands and closes the pair of hook portions; a lifting rod that holds the jig body and lifts it to the height of the mounting body; and an operating member connected to the jig body lifted to the height of the mounting body, which operates the movable portion to expand and close the pair of hook portions and attach the jig body to the mounting body. A mounting jig characterized by the following features.

2. The jig body comprises a pair of hook portions whose tips are movable to expand and close, and a movable portion that expands and closes the pair of hook portions; a lifting rod that holds the jig body and lifts it to the height of the mounting body; an operating member connected to the jig body lifted to the height of the mounting body, which operates the movable portion to expand and close the pair of hook portions and attach the jig body to the mounting body; and a safety net installation means having one end as a safety net and the other end connected to the jig body, which can be operated from the other end to position the safety net at a predetermined height. A safety net mounting jig characterized by the following features.

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