JPH02121679A - Hook for preventing falling while at roofing-work - Google Patents

Abstract

PURPOSE:To let a worker hold a part of the worker's body weight or to prevent the worker from falling from the inclined plane on a roof, by a method wherein the worker is tied with a rope, such as a lifeline, and a hook is connected to the upper end of the rope and hooked at the specified place near the top of the roof. CONSTITUTION:One end of a hook 3 is so placed that a piece 20 for causing friction makes contact at the upper surface of one inclined plane 19 of a roof; and the other end of the hook 3 is placed on the other inclined plane 16 beyond the ridge 2 of the roof and its end 4 is joined to a rope 5. Each of the pieces 20 is fitted to both the end of the hook 3; and one makes contact at the upper surface of one inclined plane 19 of the roof and the other at the other inclined plane 16. Furthermore, the piece 20 for causing friction is so formed that it can be inserted into a cavity 14 between tiles almost in a sticking state, and prevents the movement of the hook 3 by providing a stopping piece 24 in contact with a roofing tile 11 or a ridge tile 10.

Description

[Detailed description of the invention] For example, for electrical work (television antenna installation work), etc., for 9 workers to carry part of their body weight while working on the roof, or to prevent them from falling on the slope of the roof. One method for stopping a worker from falling in the air after falling off the roof is to tie a lifeline (hereinafter referred to as a rope) and secure the upper end of the rope to the top of the roof. The present invention fixes the rope to the top part of the roof or
It relates to devices for achieving similar effects.

This will be explained based on one embodiment. FIG. 1 shows a worker l attaching the hook 3 of the present invention to the ridge 2 of a Japanese tile roof, connecting a rope 5 to the end 4 of the hook, and tying the rope around his waist. Figure 2 shows the ridge of the roof, 6 is the crown tile, 7 to 10
11 and 12, and the tiles located lower than that, are corrugated crosspiece tiles. In Figure 3, 13 is wall soil, 14 is a cavity between the tiles, and 10 is a flat tile.

Since the 11 tiles are wavy, there is a width of about 15 pieces between them.
Average height approximately 31. Which cavity is at depth 3α? (Since the size of the crosspiece tiles is constant according to JIS standards, the cavities between the tiles are also constant.) The hook 3 will be explained with reference to FIGS. 4 to 10. Reference numeral 15 denotes a hook body made of a metal pipe, and one end 4 of the hook body is located on the slope 16 of the roof where the worker is located, and a rope 5 is connected to the hook body, and the rope is tied to the worker. The hook body extends beyond the ridge 2 of the roof to the other slope 19 of the roof, and a friction piece 20 is attached to the end thereof so as to be swingable about a swing shaft 21. The friction piece has the shape shown in Figures 5 and 6, and
The part on the right side of the figure has a shape almost equal to the intertile cavity 14 as shown in Fig. 6, and that part of the friction piece can be easily inserted and attached to the intertile cavity 14 as shown in Fig. 4. . Further, a portion 23 where the friction piece 20 contacts the wavy crosspiece tile 11 located below is made of a material (such as rubber) that has a large coefficient of friction with the tile. Further, a blocking piece 24 is fixed to the friction piece 20.

Now, suppose that when the hook 3 is in the state shown in FIG. 4, a worker slips down and a large tension is applied to the rope 5. FIG. 7 shows the force acting on the hook 3 at this time. Note that the slopes 16 and 19 that descend from the ridge 2 on both sides are both θ. T is the pulling force of the rope (when the worker slips down, the direction of the rope is almost parallel to the slope of the roof), Nl is the force that the crosspiece tile 11 pushes perpendicularly to the contact surface with the friction piece (normal force), F
l is the frictional force caused by the crosspiece tile 11, N2 is the force (normal force) pushed by the slope 16, and F2 is also the frictional force. When these forces are balanced and the hook is at rest, the force polygon is shown in FIG. Note that when considering whether the friction piece 20 will slip on the crosspiece tile 11, if N2 and F2 are ignored, the force polygon will be as shown in FIG. 9. If 1·1 in FIG. 9 is the maximum static friction force, the angle ρ becomes the friction angle. Therefore the 9th
In the figure, if 90°-2θ<ρ, the friction piece will not slip. In other words, if the slope θ of the roof is θ) + (90 − ρ, the hook will be locked to the slope of the roof. Figure 10 shows the polygon of force when θ is small and the hook slips. The friction piece 20 in FIG.
0 generates F in FIG. 10 and the friction piece stops. Furthermore, since the friction piece is installed in the cavity between the tiles and has a sufficient width, the hook 3 will not fall toward the front or the opposite side in FIG. 4. When a load of 150 to 9 was applied to the rope 5 of the prototype hook 3 shown in Fig. 4, the metal pipe of the hook body was slightly elongated, but no other abnormality occurred. In addition, blocking piece 2
4, the friction piece 20 would come into contact with the wall soil at the back of the cavity 14 between the tiles and scrape off this wall soil.

Next, modifications of the device according to the present invention will be described.

In FIG. 4, the blocking piece 24 may be removed from the friction piece 20, and a blocking piece 25 shown by a dotted line may be fixed to the friction piece 20. When a load is applied to the hook, the blocking piece 25 comes into contact with the crosspiece tile 11. Alternatively, both the blocking pieces 24 and 25 may be attached to the friction piece. Figure 1I shows friction pieces 26 at both ends of the metal pipe.
27 and a connecting ring (carabiner) 28 that can be opened and closed is attached to the golden pipe, and a rope 29 is connected to the connecting ring so that the worker can use it on either side of the slope of the roof. For convenience of carrying, the metal pipe is divided into parts, the joined portions are flattened, and the pipes are connected so as to be bendable by the shaft 3o. 31 is a stopper that limits the opening of the two friction pieces when a load is applied. Further, a screw 32 may be provided on the stopper.

The distance between the friction pieces can be adjusted to match the width of the roof ridge. Figure 12 shows the two hooks shown in Figure 4 attached to the roof of the awning, the ends 37° and 38 of the hooks connected with a connecting rope 39, and a connecting ring (karahina) 40 that can be opened and closed connected to the rope. The connecting ring 40 and the worker are tied together with a rope. FIG. 13 shows a case where the roof has neither a ridge nor a cavity between tiles. In this case, an eave coupler 41 is installed at the end of the slope of the roof (eave), and a friction piece 42 is connected to the eave coupler 41 by a rope 4.
Combine with 3. A friction piece 42 is installed to prevent the hook 44 from falling down.
The width of the friction piece can be increased or the friction piece can be divided into two as shown in Fig. 14. FIG. 15 shows a version of the hook shown in FIG. 13 which can be used on either slope of the roof. 46 is a hook, 47 and 48 are friction pieces, and 49 is a connecting ring. FIG. 16 shows a case where there is no cavity between tiles, but there is also a low ridge 51 at the top of the roof. By applying the friction piece 52 to the ridge 51 as well, an effect similar to that of increasing the slope of the roof is obtained. The parts where the friction piece 52 contacts the slope and ridge of the roof are made of a material that has a large coefficient of friction with them. FIG. 17 shows a case where the hook body 54 and the friction pieces 55 and 56 are fixed, and the holes 57 and 58 are for connecting the rope 59. In this case as well, the effect is similar to that of increasing the slope of the roof. 18th
The figure shows a case where the ridge 61 has a cavity 60 between the tiles but is structurally not strong against upward force on the slope.

Next, the features of the present invention will be described. A rope (lifeline) is tied to the worker, a hook is connected to the upper end of the rope, and the hook is attached to a specific location near the top of the roof. Worker is working 1
The point where the hook is attached must be able to withstand breakage or falling off due to the tension of the rope when carrying part of the body's weight, falling off the slope of the roof, or falling off the roof and hanging in the air. . On the other hand, roofs are made of earth and tiles, so they generally have less resistance. The first feature of the present invention is
This is done by finding a point that can withstand a large amount of force, and applying most of the rope's tension to that point. For example, a person wearing rubber-soled shoes can stand on the slope of a roof even if he or she is heavy. The reason for this is that the slope of the roof has a large ability to withstand the force that pushes the slope vertically (normal force), and the coefficient of friction between the tiles and the rubber is large. The present invention is such that most of the tension of the lobes becomes the normal force and frictional force and is applied to the slope of the roof. In other words, the friction piece is often placed opposite the slope where the worker is, and it is often necessary to compensate for this. This dam must be able to withstand an upward force that is parallel to the slope of the roof, and there are many places on the roof that can withstand this force, and the present invention makes use of these points. Note that this force is larger as the slope of the roof becomes smaller; 7). On the other hand, the smaller the inclination of the slope, the smaller the force applied to the rope when a worker slips down the slope.

Therefore, although a small slope of the roof is not so disadvantageous, it is necessary to avoid the situation where the vehicle falls off the roof and hangs in the air. The third feature is 9 Japanese tile roofs.
There is a cavity between the tiles between the Noshi tiles and the Sam tiles. By fitting the friction piece attached to the tip of the hook to the shape of this cavity and inserting and attaching the friction piece into the cavity, the withstanding force is strong and stable, and rotation of the hook is prevented.

Note that there are various roof shapes, so when using the hook of the present invention, the strength of the roof should be verified through experiments (for example, by two people climbing down the ridge), especially if the hook falls off the roof and is in the air. If there is a possibility of the rope hanging, a device to limit the tension on the rope (
For example, it is desirable to use the device in Japanese Patent No. 1,454,426) in combination.

In addition to electrical work on roofs, this device is used for tasks such as removing snow from roofs, installing water heaters on roofs, and repairing roofs.

[Brief explanation of drawings]

FIG. 1 is a sketch of nine workers using the hook of the present invention on a roof. Figure 2 is a sketch of the area around the ridge of a typical Japanese-style roof. FIG. 3 is a cross-sectional view of the ridge of the roof in FIG. 2. Fig. 4 is a diagram of a hook according to the present invention attached to a ridge of a roof. Fig. 5 is a side view of a friction piece attached to the tip of the hook, viewed from the right side when facing Fig. 6. Fig. 6 is a front view of the friction piece, viewed from the right side facing Fig. 5. Fig. 7 is a diagram showing the force acting on the hook in Fig. 4. Fig. 8
The figure shows the polygon of the force acting on the hook. Figure 9 shows the force triangle when N2 and F2 are removed from Figure 8. Figure 10 shows the force triangle when the slope of the roof is small and the hook slips. Figures 11 to 18 are 9
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Claims (1)

[Claims] 1. A friction piece 20 is attached to one end of the hook 3.
The other end of the hook 3 is passed over the ridge 2 of the roof to the other slope 16 of the roof, and the rope 5 is attached to the hook 3. A hook for preventing slipping during roof work, characterized by engaging. 2. Attach friction pieces to both ends of the hook so that one of the friction pieces can come into contact with the top of one slope of the roof, and the other of the friction pieces can come into contact with the top of the other slope of the roof. Claim 1 characterized in that
A hook to prevent slipping during roof work as described in section. 3. The friction piece is designed so that it can be inserted almost closely into the inter-tile cavity between the uppermost tile of the tile forming the slope of the roof and the tile directly above the tile. 3. A hook for preventing slipping during roofing work according to claims 1 and 2, characterized in that the friction piece is provided with a blocking piece that can come into contact with the crosspiece tile or the roof tile.