JP6746814B1 - Hook disengagement prevention tool for tool drop prevention device and its usage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hook disengagement preventive fitting of a tool drop prevention device capable of reliably preventing a tool drop accident without the hook on the tool drop prevention device side being accidentally disengaged from a ring member on the tool side. A hook disengagement prevention metal fitting (21) of the present invention includes a flat metal fitting body (22). A hook through hole 23 is formed at the center of the metal fitting body 22. A notch 25 having a width substantially equal to the width of the hook 11 is formed at one location on the outer edge 24 of the metal fitting body 22. A ring insertion hole 26 having a smaller diameter than the hook through hole 23 is formed between the hook through hole 23 and the notch 25 in the metal fitting body 22. A first region R1 that allows the hook 11 to be removed when the ring member 2 is not present is set at a position where the cutout 25 is present. On the other hand, the second region R2 that does not allow the hook 11 to be removed is set at a position where the cutout portion 25 does not exist. [Selection diagram] Fig. 3

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook detachment prevention metal fitting for a tool drop prevention device and a method of using the metal fitting.

An operator who uses a tool at a high place such as a construction site takes out a predetermined tool from the tool holder on the safety belt wrapped around his waist according to the work content, and inserts the tool after the work is completed. Repeatedly returning to the above and replacing with another tool. In this case, the worker needs to take measures to prevent a tool drop accident from a high place. Therefore, an operator conventionally works by using a commercially available tool drop prevention device while connecting the tool side and the safety belt side (for example, refer to Patent Document 1).

A conventional tool drop prevention device of this type includes a drop prevention string having hooks at both ends. Then, by passing the hook on the base end side through the ring member on the safety belt side and the hook on the tip side through the ring member attached to the tool side, the tool side and the safety belt side are connected via the tool drop prevention device. I am trying to connect. Further, as a hook in such a device, a hook having a structure in which a latch portion is rotatably provided in an opening portion of a hook-shaped hook body is generally used. The latch portion is always biased by the biasing force of the spring in the direction of closing the opening of the hook body.

JP, 2009-297819, A

However, even when the above-described tool drop prevention device of the related art is used, the tip side hook is inadvertently disengaged from the tool side ring member due to an external force applied to the latch portion during work or movement. Occasionally, there was a case in which the worker was scared. Therefore, in the field, for example, a measure has been taken in which a tape is wrapped around the tip side hook to cover and fix the latch portion. However, even if such a measure is taken, it is difficult to say that it is an effective tool drop prevention measure because the tape is displaced or peeled off with the passage of time.

The present invention has been made in view of the above problems, and an object thereof is to reliably prevent a tool drop accident without accidentally disengaging the tool drop prevention device side hook from the tool side ring member. It is an object of the present invention to provide a hook disengagement prevention metal fitting for a tool drop prevention device and a method of using such a metal fitting.

In order to solve the above-mentioned problems, the invention described in Means 1 is used in a state of being interposed between a ring member mounted on the tool side and a hook provided at the tip of a drop-preventing string forming a tool drop-preventing device. A metal fitting provided with a flat metal fitting main body, a hook through hole for passing the hook is formed in a central portion of the metal fitting main body, and a width of the hook is provided at one location on an outer edge of the metal fitting main body. A notch portion having a substantially equal width is formed, and a ring insertion hole, which has a smaller diameter than the hook through hole and allows the ring member to pass, is formed between the hook through hole and the notch portion in the metal fitting body. A first region that allows removal of the hook when the ring member is absent is set to a position with the cutout portion, while a second region that does not allow removal of the hook does not have the cutout portion The distance from the inner edge of the hook through hole in the first region to the outer edge of the metal fitting body is greater than the distance from the inner edge of the hook through hole in the second region to the outer edge of the metal fitting body. The distance from the inner edge of the hook through hole to the outer edge of the metal fitting body in the first region is smaller than the inner diameter of the arc-shaped curved portion of the hook body in the hook, The distance from the inner edge of the hook through hole to the outer edge of the metal fitting body in the two regions is set to be equal to or larger than the inner diameter of the arcuate curved portion of the hook body. The gist is the hook disengagement prevention fitting of the tool drop prevention device.

Therefore, according to the invention described in the means 1, the distance from the inner edge of the hook through hole in the first area to the outer edge of the metal fitting body (hereinafter, also referred to as "distance between inner and outer edges in the first area") is the second area. Is set to be shorter than the distance from the inner edge of the hook through hole to the outer edge of the metal fitting body (hereinafter, also referred to as "distance between inner and outer edges in the second region"). Therefore, when the hook is located in the first area, removal of the hook is allowed, but when the hook is located in the second area, removal of the hook is not allowed. However, in the mounted state of the tool in which the ring member is passed through the ring insertion hole, the ring member existing in the first area becomes an obstacle, and the hook in the second area cannot be rotationally moved to the first area. That is, the ring member passed through the ring insertion hole functions as a locking mechanism, so that removal of the ring member is an essential condition for removing the hook. Therefore, when the tool is installed with the ring member inserted through the ring insertion hole, the hook on the tool drop prevention device side does not accidentally come off from the ring member on the tool side, and it is possible to reliably prevent a tool drop accident. You can

According to a second aspect of the present invention, in the first aspect, the metal fitting body has a substantially circular shape, the hook through hole has a substantially D-shape, and an arc-shaped inner edge faces a lower side of the metal fitting body. The gist of the invention is that the linear inner edge is formed to face the upper side of the metal fitting body, and the notch is formed in the upper edge portion of the metal fitting body.

Therefore, according to the invention described in the means 2, since the arc-shaped inner edge of the substantially D-shaped hook through hole faces the lower side of the substantially circular metal fitting body, an external force is applied to the hook when the tool is mounted. When hooked, the hook can move smoothly without being caught on the inner edge of the hook through hole or the outer edge of the metal fitting body. Therefore, the usability is improved for the operator. Further, since the straight inner edge faces the upper side of the metal fitting body, it is possible to provide a structure in which the distance between the inner and outer edges in the first region can be easily shortened. Further, it becomes easy to secure a space for forming the ring insertion hole in the first region.

The invention described in means 3 is a method of using the hook detachment preventing metal fitting according to means 1 or 2, wherein when the tool is attached, the hook is first opened at the position of the first region. Through the hook through hole, and then the hook is rotationally moved from the first region to the second region, and then the ring member is passed through the ring insertion hole, whereby the tool and the tool drop prevention device are connected. When connecting and detaching the tool, the ring member is first removed from the ring insertion hole, and then the hook is rotationally moved from the second region to the first region, and then at the position of the first region. A method of using a hook detachment prevention metal fitting of a tool drop prevention device, characterized in that the connection between the tool and the tool drop prevention device is released by opening the hook and removing the hook from the hook through hole. And

Therefore, according to the invention described in the means 3, at the time of mounting the tool, if the hook passed through the hook through hole is rotationally moved from the first region to the second region and then the ring member is passed through the ring insertion hole, the ring is inserted. The member is locked. As a result, the hook does not rotate again to the second area, and the hook cannot be removed. Further, when the tool is detached, by removing the ring member from the ring insertion hole, the hook can be rotationally moved from the second region to the first region, and the hook can be detached.

As described in detail above, according to the inventions of claims 1 to 3, the tool drop prevention tool side hook is not accidentally disengaged from the tool side ring member, and the tool drop accident is reliably prevented. It is possible to provide a tool for preventing the hook from coming off of a tool drop prevention device and a method of using such a tool.

In one embodiment which materialized the present invention, the front view showing the state where the ring member by the side of a tool and the hook by the side of a tool fall prevention instrument were connected via a hook detachment prevention metal fitting. In the present embodiment, a partially cutaway side view showing a state in which a ring member on the tool side and a hook on the tool drop prevention device side are connected via a hook detachment prevention metal fitting. (A) is a front view showing a hook detachment preventing metal fitting, (b) is a side sectional view thereof, and (c) is a front view for explaining positions of a first region and a second region. (A) is a front view showing a state before the hook is passed through the hook through hole at the position of the first region when the tool is attached, and (b) is a front view showing a state after the hook is passed through the hook through hole. Fig. The front view which shows the state which rotated the hook from the 1st area|region to the 2nd area|region at the time of mounting of a tool. The front view for demonstrating that a hook cannot be rotationally moved from a 2nd area|region to a 1st area|region at the time of mounting of a tool. The partially broken side view for demonstrating that removal of a hook is not permitted when the hook is in the second region. The partially broken side view for demonstrating that removal of a hook is not permitted when the hook is in the second region. FIG. 7 is a front view showing a state in which the hook is rotationally moved from the second region to the first region after removing the ring member from the ring insertion hole when the tool is detached. The partially broken side view for demonstrating that removal of a hook is permitted when a hook exists in a 1st area|region. The partially broken side view for demonstrating that removal of a hook is permitted when a hook exists in a 1st area|region.

Hereinafter, a hook disengagement prevention metal fitting of a tool drop prevention device according to an embodiment of the present invention and a method of using the metal fitting will be described in detail with reference to FIGS. 1 to 11.

FIG. 1 is a front view showing a state in which a ring member 2 on the tool 1 side and a hook 11 on the tool drop prevention device 3 side are connected via a hook disengagement prevention metal fitting 21, and FIG. It is a figure. Here, the tool 1 is not particularly limited, but examples thereof include tools that are commonly used in high-altitude work, such as tool 1 such as ratchet wrench, monkey wrench, and radio pliers. A ring insertion hole 6 is formed in the handle portion for gripping the tool 1, and the ring member 2 is inserted into the ring insertion hole 6. The ring member 2 is not particularly limited and various kinds are used, but it is preferable to use, for example, a metal double ring made of stainless steel or the like.

The tool drop prevention device 3 of the present embodiment includes a drop prevention string 4 having a stretchable structure. A hook (not shown) is connected to the base end side of the fall prevention strap 4. The hook on the base end side is passed through a ring member (not shown) on the side of a safety belt (not shown) that is wrapped around the waist by the worker.

As shown in FIGS. 1 and 2, the hook 11 is also connected to the tip side of the fall prevention strap 4. The hook 11 on the front end side in the present embodiment is a so-called swivel hook including a hook body 12, a latch portion 13, a swivel portion 14, and the like. The hook body 12 is a hook-shaped member as a whole, and has a beak portion 15, a jaw portion 16, and an arc-shaped curved portion 17. The lower end side of the latch portion 13 is rotatably cantilevered on the jaw portion 16 of the hook body 12. A spring member (not shown) is provided on the jaw portion 16, and the biasing force of the spring member always acts on the latch portion 13. As a result, the upper end side of the latch portion 13 is kept in contact with the beak portion 15 from the inside of the hook body 12 to close the opening of the hook body 12. The swivel portion 14 is formed into a substantially trapezoidal shape and a ring shape, and is rotatably attached to the base end side of the hook body 12. Further, the tip end side of the drop prevention string 4 is connected to the swivel portion 14. In this embodiment, a hook made of stainless steel, for example, is used as the hook 11.

As shown in FIGS. 3A and 3B, the metal fitting body 22 that constitutes the hook detachment prevention metal fitting 21 of the present embodiment is a flat plate-shaped member having a substantially circular shape. The material for forming the hook disengagement prevention fitting 21 is not particularly limited, but a metal such as stainless steel is used from the viewpoint of ensuring strength. The thickness of the hook disengagement prevention fitting 21 is not particularly limited and is appropriately selected according to the size of the target hook 11 and the like, but is set to, for example, about 1 mm to 5 mm.

A hook through hole 23 for passing the hook 11 is formed in the center of the metal fitting body 22. The shape of the hook through hole 23 is arbitrary and is not particularly limited, but in the present embodiment, the hook through hole 23 has a substantially D shape. The size of the hook through hole 23 is also arbitrary and is not particularly limited, but is, for example, about 1/4 to 1/2 of the maximum diameter of the metal fitting body 22. Further, the arc-shaped inner edge of the substantially D-shaped hook through hole 23 is formed in a state of being located below the metal fitting body 22. The straight inner edge of the substantially D-shaped hook through hole 23 is formed in a state of being located above the metal fitting body 22. The length of the straight inner edge is formed to be slightly wider than the width of the hook 11 (see FIG. 1).

As shown in FIGS. 3A and 3B, the notch 25 is formed at one location on the outer edge 24 of the metal fitting body 22, specifically at the center of the upper edge. In this embodiment, the notch 25 has a horizontally long rectangular shape and is formed to have a width substantially equal to the width of the hook 11. The bottom of the notch 25 and the linear inner edge are in a positional relationship parallel to each other.

A ring insertion hole 26 for inserting the ring member 2 is formed in the metal fitting body 22 at an intermediate position between the hook through hole 23 and the cutout portion 25. The ring insertion hole 26 has a circular shape and is formed to have a diameter as small as about 1/3 to 1/2 of that of the hook through hole 23.

As shown in FIG. 3C, two regions (that is, a first region R1 and a second region R2) are set in the hook detachment prevention fitting 21 of the present embodiment. The first region R1 is a region that allows the hook 11 to be removed when the ring member 2 is absent, and is set corresponding to the position where the cutout 25 is present (upward to the left in FIG. 3C). See the hatched section). The second region R2 is a region that does not allow the hook 11 to be removed, and is set corresponding to a position where the cutout portion 25 is not provided (see the rightward hatching portion in FIG. 3C). The area of the first region R1 is considerably smaller than the area of the second region R2.

As shown in FIGS. 3A and 3B, in the present embodiment, the inner-outer edge distance d1 in the first region R1 is somewhat shorter than the inner-outer edge distance d2 in the second region R2. Is set. In other words, the inner-outer edge distance d1 in the first region R1 is shorter than the inner-outer edge distance d2 in the second region R2 by an amount substantially corresponding to the depth of the cutout portion 25. Incidentally, when the dimension of the inner diameter L1 of the arcuate curved portion 17 is used as a reference (see FIGS. 8 and 11), the inner-outer edge distance d2 in the second region R2 is equal to or larger than the inner diameter L1. Is set to be. On the other hand, the distance d1 between the inner and outer edges in the first region R1 is set to be slightly smaller than the inner diameter L1.

Next, a method of using the hook disengagement prevention fitting 21 of the present embodiment will be described.

First, the procedure for mounting the tool 1 will be described. FIG. 4A shows a state before the hook 11 is passed through the hook through hole 23 at the position of the first region R1. At this point, the ring member 2 has not yet been inserted into the ring insertion hole 26. Here, while opening the hook 11, the hook 11 is made to enter from the outer edge of the first region R1 (that is, the portion having the cutout portion 25) toward the central portion of the metal fitting body 22, and the hook 11 is inserted into the hook through hole 23. Pass through. FIG. 4B shows a state after the hook 11 is passed through the hook through hole 23. In addition, in FIG. 4B, the arcuate curved portion 17 is arranged in the hook through hole 23.

Next, as shown in FIG. 5, the hook 11 is rotated 180° in a plan view and moved from the first region R1 to the second region R2. Then, as shown in FIG. 6, the ring member 2 previously provided on the tool 1 side is passed through the ring insertion hole 26. As a result, the tool 1 side and the tool drop prevention device 3 side are in a state of being connected via the hook detachment prevention metal fitting 21 of the present embodiment. At this time, the arcuate curved portion 17 of the hook 11 normally maintains a state of being in contact with the arcuate inner edge of the substantially D-shaped hook through hole 23. In this state, even if the hook 11 is rotationally moved from the second region R2 to the first region R1 as shown by the arrow A1, the ring member 2 interferes with and hits the hook 11 in the first region R1. It cannot be reached (see FIG. 6).

FIG. 7 shows a state before the hook 11 is detached when the hook 11 is in the second region R2. In order to remove the hook 11 from this state, it is necessary to rotate the latch portion 13 counterclockwise in FIG. 8 and sufficiently open the opening portion of the hook body 12. However, the distance d2 between the inner and outer edges in the second region R2 is equal to or larger than the inner diameter L1 of the arcuate curved portion 17, as described above. Therefore, the hook detachment prevention metal fitting 21 is caught on the inner side surface of the arcuate curved portion 17, and the inclination angle of the hook detachment prevention metal fitting 21 is small. Therefore, the hook disengagement prevention metal fitting 21 cannot be in a horizontal state, and the hook disengagement prevention metal fitting 21 cannot be sufficiently retracted toward the arcuate curved portion 17 side. Therefore, the hook disengagement prevention metal fitting 21 is located on the movement path of the latch portion 13 and is in an obstructed state. Therefore, in the state of FIG. 8, it is understood that the opening degree of the hook main body 12 becomes small and the hook disengagement prevention fitting 21 cannot be removed from the hook 11.

Next, a procedure for removing the tool 1 from this state will be described. As shown in FIG. 9, in order to detach the tool 1, first, the ring member 2 is removed from the ring insertion hole 26. Then, the ring member 2 that has played the role of the lock mechanism is removed from the ring insertion hole 26, and the obstacle on the first region R1 is removed, so that the lock is released. Therefore, the hook 11 can be rotated in the direction of the arrow A1 to move the hook 11 from the second region R2 to the first region R1, that is, to a position where the hook 11 can be removed.

FIG. 10 shows a state before the hook 11 is detached when the hook 11 is in the first region R1. In order to remove the hook 11 from this state, it is necessary to rotate the latch portion 13 counterclockwise in FIG. 11 and sufficiently open the opening of the hook body 12. The distance d1 between the inner and outer edges in the first region R1 is set to be slightly smaller than the inner diameter L1. Therefore, the hook disengagement prevention fitting 21 is not caught on the inner surface of the arcuate curved portion 17, and the hook disengagement prevention fitting 21 has a large tiltable angle. Therefore, the hook disengagement prevention fitting 21 can be easily brought into a horizontal state, and the hook disengagement prevention fitting 21 can be sufficiently retracted toward the arcuate curved portion 17 side. Therefore, the hook disengagement prevention metal fitting 21 is not located on the movement path of the latch portion 13 and does not interfere with the movement of the latch portion 13, so that the movement path of the latch portion 13 is largely secured. Therefore, in the state of FIG. 11, it can be seen that the opening degree of the hook body 12 can be maximized and the hook disengagement prevention fitting 21 can be removed from the hook 11. Then, by opening the hook 11 at the position of the first region R1 and removing the hook 11 from the hook through hole 23, the connection between the tool 1 and the tool drop prevention device 3 can be released.

And according to this embodiment, the following effects can be acquired.

(1) In the hook disengagement prevention fitting 21 of the tool drop prevention device 3 of the present embodiment configured as described above, the inner-outer edge distance d1 in the first region R1 is larger than the inner-outer edge distance d2 in the second region R2. It is set to be short. Therefore, although the hook 11 can be removed when the hook 11 is located in the first region R1, the hook 11 cannot be removed when the hook 11 is located in the second region R2. However, in the mounted state of the tool 1 in which the ring member 2 is passed through the ring insertion hole 26, the ring member 2 existing in the first region R1 becomes an obstacle, and the hook 11 in the second region R2 reaches the first region R1. It cannot move in rotation. That is, the ring member 2 passed through the ring insertion hole 26 functions as a so-called locking mechanism, and removal of the ring member 2 is an essential condition for removing the hook 11. Therefore, even if an external force is applied to the latch portion 13 during work or movement, the hook 11 on the tool drop prevention device 3 side does not accidentally come off from the ring member 2 on the tool 1 side. Therefore, it is possible to surely prevent the accidental fall of the tool 1. Further, according to the hook detachment prevention metal fitting 21 of the present embodiment, it is not necessary to perform the complicated work of winding the tape around the hook 11 and covering and fixing the latch portion 13 every time at the site, and the workability is significantly improved. Moreover, since the hook disengagement prevention fitting 21 of the present embodiment has an extremely simple structure despite being effective as a measure for preventing the tool 1 from falling, it is possible to sufficiently satisfy the requirements for weight reduction and cost reduction. ..

(2) In the hook disengagement prevention fitting 21 of the tool drop prevention device 3 of the present embodiment, the arc-shaped inner edge of the substantially D-shaped hook through hole 23 is directed to the lower side of the substantially circular fitting main body 22. Has been adopted. Therefore, when an external force is applied to the hook 11 with the tool attached, the hook 11 can move smoothly without being caught by the inner edge of the hook through hole 23 or the outer edge 24 of the metal fitting body 22. Therefore, the usability is improved for the operator. Further, the hook disengagement prevention metal fitting 21 has a structure in which the linear inner edge is directed to the upper side of the metal fitting body 22. Therefore, it is possible to provide a structure in which the inner-outer edge distance d1 in the first region R1 can be easily shortened, and further, the hook 11 reaching the first region R1 can be easily attached and detached. Further, it becomes easy to secure a space for forming the ring insertion hole 26 in the first region R1.

It should be noted that the present invention is not limited to the above-described embodiment, and can be arbitrarily modified within a range not departing from the spirit of the invention.

In the above embodiment, the metal fitting body 22 is formed in a substantially circular shape, but the shape is not limited to this and may be another shape other than the substantially circular shape (for example, a polygonal shape). Further, although the hook through hole 23 is formed in a substantially D-shape in the above-described embodiment, it may have a shape other than the substantially D-shape (for example, a circular shape or an elliptical shape). Further, although the swivel hook is used as the hook 11 in the above embodiment, a hook other than the swivel hook may be used. Further, in the above-described embodiment, the horizontally long rectangular cutout 25 is formed, but other shapes may be used.

In the above embodiment, the metal fitting body 22 forming the hook detachment prevention metal fitting 21 is made of stainless steel, but may be made of metal other than stainless steel.

DESCRIPTION OF SYMBOLS 1... Tool 2... Ring member 3... Tool fall prevention device 4... Fall prevention string 11... Hook 21... Hook detachment prevention metal fitting 22... Metal fitting body 23... Hook through hole 24... Metal fitting body outer edge 25... Notch 26... Ring insertion Hole d1... Distance from inner edge of hook through hole to outer edge of metal fitting body in first area d2... Distance from inner edge of hook through hole to outer edge of metal fitting body in second area R1... First area R2... Second area

Claims (3)

A metal fitting used in a state of being interposed between the ring member attached to the tool side and the hook provided at the tip of the drop-preventing string forming the tool drop-preventing device,
With a flat metal fitting body, a hook through hole for passing the hook is formed in the central portion of the metal fitting body, and a notch portion having a width substantially equal to the width of the hook is formed at one location on the outer edge of the metal fitting body. A ring insertion hole is formed between the hook through hole and the notch in the metal fitting body, the ring insertion hole having a diameter smaller than that of the hook through hole and through which the ring member is inserted.
A first region that allows the hook to be removed when the ring member is absent is set at a position with the cutout, while a second region that does not allow the hook to be removed is located at the position without the cutout. Is set,
The distance from the inner edge of the hook through hole to the outer edge of the metal fitting body in the first area is set to be shorter than the distance from the inner edge of the hook through hole in the second area to the outer edge of the metal fitting body. Along with
The distance from the inner edge of the hook through hole in the first region to the outer edge of the metal fitting body is smaller than the inner diameter of the arcuate curved portion of the hook body in the hook, and from the inner edge of the hook through hole in the second region. The tool fall prevention device hook is characterized in that the distance to the outer edge of the metal fitting body is set to be equal to or larger than the inner diameter of the arcuate curved portion of the hook body. Removal prevention metal fittings. The metal fitting body has a substantially circular shape, the hook through hole has a substantially D shape, and the arc-shaped inner edge faces the lower side of the metal fitting body and the straight inner edge faces the upper side of the metal fitting body. The hook disengagement prevention metal fitting of the tool drop prevention device according to claim 1, wherein the notch portion is formed in a closed state, and the cutout portion is formed at an upper edge portion of the metal fitting body. A method of using the hook detachment prevention metal fitting according to claim 1 or 2,
At the time of mounting the tool, first, the hook is opened at the position of the first region, the hook is passed through the hook through hole, and then the hook is rotationally moved from the first region to the second region. , By passing the ring member through the ring insertion hole, to connect the tool and the tool drop prevention device,
When the tool is detached, first, the ring member is removed from the ring insertion hole, then the hook is rotationally moved from the second area to the first area, and then the hook is opened at the position of the first area. A method for using a hook detachment prevention fitting of a tool drop prevention device, characterized in that the connection between the tool and the tool drop prevention device is released by removing the hook from the hook through hole.

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