JPH0241984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that protects the safety of workers who ascend and descend utility poles by preventing them from falling. Conventionally, when going up and down utility poles, workers had to take turns alternating the pole safety belt rope attached to their body while going up and down the utility pole, which was inefficient and resulted in failure to do so. If you make a mistake, you will be left defenseless,
At that time, a crash occurred.

SUMMARY OF THE INVENTION The object of the present invention is to eliminate and improve upon these conventional drawbacks and to provide a permanent fall prevention device that protects the safety of workers who ascend and descend utility poles.

Another object of the present invention is that the performance required for this type of safety equipment and safety device is to have the strength to withstand the impact load when arresting a falling human body, and to not only retain and retain a falling human body. It is necessary to have the function of absorbing and mitigating the impact load that is applied to the human body when stopping a fall, so as not to cause injury to the human body.The safety belt standards of the Ministry of Labor require that the impact applied to the human body be taken into consideration the safety limits of the human body against fall impact. Since it is stipulated that safety belts and safety devices be designed so that the load is 900 kgf or less, the purpose is to provide a device with excellent cushioning properties.

Aspects of the invention will now be described in detail with reference to an embodiment illustrated in the accompanying drawings.

As shown in FIGS. 1 to 6, this embodiment includes a substrate 1, an arm 2 protruding from the bottom of the substrate 1, and a support member 3 connecting the arm 2 and the substrate 1 to the top of the arm 2. A truss structure is constructed, the substrate 1 is slightly curved so as to follow the outer surface of the utility pole P, the coupling member 23 of the utility pole band 5 is provided at the upper end portion, and a portion of the center bulges out to the front side, and the bulge portion 14 A support hole 15 and an arm hole 16 are bored in the arm hole 16.
The arm stand 1 is located inside the bulge 14 in the part where the
7, and a base end of an arm 2 made of a steel bar with a coupling hole 13 at its tip is inserted into the arm hole 16 and brought into contact with the arm stand 17, and the arm 2, the arm stand 17, and the arm The hole 16 portion is fixed to the substrate 1 by welding or the like, and the distal end portion of the support member 3, which has a narrow diameter portion 20 having a smaller cross-sectional area than other portions in the middle portion, is attached to the arm 2 using a steel bar material. The upper fixing metal fitting 4 is formed by fixing to the middle part of the upper surface by welding or the like, fitting the proximal end into the support hole 15 of the substrate 1, and fixing that part by welding or the like.
An electric wire, wire rope, messenger wire, etc. made of bare wire is cut to a predetermined length, a connecting member 10 is attached to the upper end, a connecting member 11 is attached to the lower end to form a guideline 12, and the guideline 12 is formed on the front side of the board 6. An arm 7 made of a bar is bent and protruded near the upper end,
A support member 24 with a part of the board 6 erected is fixed to an intermediate bent part on the lower surface of the arm 7, and a band pass-through part 25 is provided on each side of the support member 24 to form a lower fixing metal fitting 8. Attach the utility pole band 5 to the coupling member 23, attach the upper fixture 4 to a predetermined upper part of the utility pole P using the utility pole band 5, attach the utility pole band 9 to the band pass-through portion 25 of the lower fixture 8, and attach the utility pole band 5 to the upper part of the utility pole P. 9, the lower fixing bracket 8 is attached to the lower part of the utility pole P in the same direction as the upper fixing bracket 4, and the upper connecting member 10 of the guideline 12 is attached to the arm 2 of the upper fixing bracket 4 by the retaining bracket 26. , the lower connecting member 11 is connected to the connecting hole 28 of the arm 7 of the lower fixing metal fitting 8 by the lower retaining metal fitting 27, and the guideline 12 is set to a predetermined value by adjusting the lower retaining metal fitting 27. It was installed under tension.

In this way, the fall prevention device of the present invention is permanently installed on a utility pole.

When working at heights, the worker carries the safety device 29 to the site, fits the safety device 29 into the guideline 12 attached to the utility pole P, and attaches the hook 30 attached to the guideline 12 to the worker's body. The operator engages the ring of the belt and moves up and down the utility pole P in this state.

If a worker slips while ascending or descending and falls, the safety device 29 immediately grabs the guideline 12 and stops the worker, stopping the worker. When this is stopped, a high impact load is applied to the body and various parts of the device.

In experiments, when a 75 kg sand bag (comparable to a human body) is dropped 2 m and held back, the impact load is approximately 1200 kgf (Figure 12). This is 900 kg, which is the standard for safety belts.
Since it is dangerous to exceed f, it is buffered by approximately 1/
The fall prevention device of the present invention is designed to have an impact load of around 600 kgf.

That is, since the conventional product had an elastic design to be strong and not deform, it exhibits a shock waveform as shown in FIG. 12. However, the upper fixing metal fitting 4 of the present invention
Because it has a plastic design, it has a low impact load as shown in Figure 13. To explain this in more detail, a tension of approximately 200 Kgf is normally applied to the guideline 12 by the lower retaining fitting 27. Under this load of around 200 kgf, the upper fixing metal fitting 4 has a truss structure and is still in the elastic range, so it does not deform. However, when a high impact load is applied to the tip of the arm 2 of the upper fixing bracket 4 during fall prevention, the narrow diameter portion 20 of the support member 3 supporting the arm 2 is cut by the tensile load. , and then the arm 2 bends or curves significantly (FIG. 6). The waveform of the impact load measured using an oscilloscope at this time is as shown in Figure 13, and it can be suppressed to about 1/2, about 600 kgf.
The first prominent mountain-like waveform of this waveform (600Kgf)
is the load when the narrow diameter portion 20 of the support member 3 is cut, and the second gentle mountain waveform is the load when the arm 2 is curved.

In this way, in the present invention, the impact load is absorbed by converting the impact load into cutting of the support member 3 and deformation of the arm 2 through plastic design to gain (lengthen) the time required to stop the fall. The measures are being taken to keep workers safe. Moreover, by plastically designing the upper fixing metal fitting 4 to provide a buffering effect, it not only protects the worker but also relieves the impact load applied to the utility pole P itself, thereby preventing the utility pole from being cut or damaged.

Further, in the upper fixing member 4 of the present invention, the arm 2 is attached to the substrate 1 with two-point support. That is, the base end of the arm 2 is connected to the arm stand 17 and the arm hole 16.
Because it is supported at two points, when the arm 2 enters the plastic region due to impact load, it will not be torn off from the base of the board, and the plastic will be maintained at the part near the center of the arm 2 where the quality is stable. It has excellent cushioning properties because it can be deformed.

Further, the upper fixing metal fitting 4 of the present invention has an arm 2 protruding from the base plate 1, a guideline 12 connected to a connecting hole 13 provided at the tip of the arm 2, and an impact load W applied to the arm 2. is applied, the base plate 1 of the base end fixed part of the arm 2 will strongly press the utility pole P in the direction of the arrow A, but at the beginning of the load, the guideline 12 connection part of the arm 2 is at a position far away from the utility pole P. Therefore, although the pressing force A on the utility pole is large, on the other hand, the arm 2 is in a state where it is easy to be plastically deformed, so the influence on the utility pole is small. In addition, if the impact load W is large and the arm 2 deforms significantly as shown in Figure 6,
Depending on the load, the guideline connecting part of arm 2 becomes weaker as it gets closer to the utility pole P, and the pressing force A on the utility pole becomes weaker.At the same time, as the plastic deformation of arm 2 increases, the force in the bending direction decreases. As the load gradually changes to a tensile direction, the pressing force A on the utility pole becomes even weaker, and the utility pole is safe because it is not damaged by the impact load when preventing it from falling, which has remarkable effects. .

FIG. 7 shows a second embodiment of the upper fixing fitting 4 of the present invention, which differs from the first embodiment in that the arm 2 is provided to protrude obliquely upward relative to the board 1, but in this case, Arm 2
You can also use a shorter one.
This is equivalent to the example. Further, a bent portion 19 may be provided in a portion of the arm 2 closer to the substrate so that the cross-sectional area becomes smaller in the load direction so that the arm 2 can be easily plastically deformed.

FIG. 8 shows a third embodiment of the upper fixing fitting 4 of the present invention, in which a ring or chain 21 is provided in place of the narrow diameter portion 20 at the intermediate portion of the arm support member 3, and the arm 2 is attached. A bush 18 having an inner diameter that is approximately the same as the outer diameter of the arm 2 is fixed in the arm hole 16 so that the bush 18 covers the proximal end of the arm 2 for reinforcement, and the arm has plasticity in the portion covered by the bush. This differs from the first embodiment in that it is prevented from deforming, but the other functions and effects are the same.

FIG. 9 shows a fourth embodiment of the upper fixture 4 of the present invention, in which a head 22 is provided at one end of the support member 3 that supports the arm 2, and when an impact load is applied to the arm 2. When the head 22 is scraped off by the support hole 15 and comes out, the support member 3 is removed.
The first point is that the function of
Although different from the example, other functions and effects are the same.

FIG. 10 shows a fifth embodiment of the upper fixing fitting 4 of the present invention, in which the arm 2 is formed into a tapered shape so as to become thinner gradually or stepwise from the substrate 1 side toward the tip. When a high impact load is applied downward to the rod, it gradually curves and deforms from the tip to the base end, absorbing and relieving the impact load, just like a fishing rod. In this case, the deformation always starts from the tip side of the arm 2 and progresses depending on the magnitude of the impact load, so that a smooth buffering effect can be obtained.

FIG. 11 shows an embodiment of the cross-sectional shape of the arm 2 provided on the upper fixing bracket 4 of the present invention, where A is circular, B is square, C is hexagonal, D is oval, and E is horizontal I-shape. , H is horizontally H-shaped, and outside these are trapezoids,
Possible shapes include triangles and pentagons.

Furthermore, the conditions for plastic deformation of the upper fixture 4 of the present invention during buffering can be easily adjusted by changing the thickness, hardness, and material of the arm 2. In addition, in order to change the function of the support member 3, that is, the function of holding the elastic region of the arm 2, the narrow diameter portion 2
This can be easily adjusted by changing the cross-sectional area of the ring 21, head 22, etc.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the present invention attached to a telephone pole, Fig. 2 is a front view of the upper fixing bracket, Fig. 3 is a plan view thereof, and Fig. 4 is a cross section taken along the line X--X in Fig. 3. Figure 5 is a perspective view of the lower fixing bracket, Figure 6 is a perspective view of the lower fixing bracket.
The figure is a vertical cross-sectional view showing the deformation state when an impact load is applied to the upper fixing bracket, Figure 7 is a front view showing a partial vertical cross-section showing the second embodiment of the upper fixing bracket, and Figure 8 is the upper part. FIG. 9 is a partially vertical front view showing a third embodiment of the fixing bracket; FIG. 9 is a front view partially showing the fourth embodiment of the upper fixing bracket; FIG. Fig. 11 is a cross-sectional view showing the arm according to the fifth embodiment, Fig. 12 is an oscillographic waveform showing the impact load when using the conventional elastically designed upper fixing metal fitting. It is a diagram. FIG. 13 is an oscillographic waveform diagram for measuring impact loads in the present invention. In the figure, 1 is the board, 2 is the arm, 3 is the support member, 4 is the upper fixing bracket, 5 is the utility pole band, 6 is the board, 7 is the arm, 8 is the lower fixing bracket, 9 is the utility pole band, and 12 is the guideline. It is.

Claims (1)

[Scope of Claims] 1. A truss structure is constituted by a substrate 1, an arm 2 protruding from the lower part of the substrate 1, and a support member 3 that connects the arm 2 and the substrate 1 to the upper part of the arm 2. When a shock load of more than a predetermined value is applied downward to the tip of the arm 2, the support member 3 loses its support function and the arm 2 curves downward to provide cushioning. A lower fixing bracket 8 with an arm 7 protruding from the base plate 6 is attached to the lower part of the utility pole P using a utility pole band 9, cut to a predetermined length, and connecting members 10, 11 are attached to both ends of the lower fixture 8. A fall prevention device for a utility pole, characterized in that the upper end of the guideline 12 provided with the guideline 12 is connected to the arm 2 of the upper fixture 4, and the lower end is connected to the arm 7 of the lower fixture 8 for tension. 2 The upper fixing metal fitting 4 has an arm 2 which curves the board 1 so as to follow the telephone pole and has a coupling hole 13 at the tip.
When a base end of the arm 2 is fixed to the substrate 1, a support member 3 is provided between the upper intermediate portion of the arm 2 and the substrate 1, and a downward impact load of a predetermined value or more is applied to the tip of the arm 2. The fall prevention device for a utility pole according to claim 1, wherein the support member 3 is damaged and the arm 2 starts deforming. 3 The upper fixing fitting 4 has a part of the board 1 bulged out 14 to the front side, a support hole 15 and an arm hole 16 are provided in the bulge portion 14, an arm stand 17 is provided in the back of the arm hole 16, and the support hole 15, one end of the support member 3 is coupled and fixed, and the base end of the arm 2 is fitted into the arm hole 16, and the base end of the arm 2 is coupled and fixed in a state in contact with the arm base 17. Fall prevention device for utility poles according to paragraph 2 or paragraph 2. 4. The upper fixing fitting 4 has a part of the substrate 1 bulged out 14 toward the front side, a support hole 15 and an arm hole 16 are provided in the bulge portion 14, and one end of the support member 3 is connected and fixed to the support hole 15. A bush 18 of a predetermined length having an inner diameter approximately the same as the outer diameter of the arm 2 is installed in the arm hole 16.
The fall prevention device for a telephone pole according to claim 1 or 2, characterized in that the base end of the arm 2 is fitted and fixed to the bush 18. 5. Claims 1, 2, 3, or 4, characterized in that when the upper fixing bracket 4 is attached to a utility pole, the arm 2 attached thereto becomes horizontal. Fall prevention device for utility poles. 6. Claims 1, 2, 3, or 4, characterized in that when the upper fixing bracket 4 is attached to a telephone pole, the arm 2 provided thereon is inclined obliquely upward. Fall prevention device for utility poles as described in . 7 Claims 1 and 2, characterized in that the arm 2 of the upper fixture 4 is made of a bar material.
The fall prevention device for utility poles described in paragraphs 3, 4, 5, or 6. 8. Claims 1 and 2 are characterized in that the arm 2 of the upper fixing metal fitting 4 has the same thickness throughout except for the connecting portion of the guideline 12, etc.
Section, Section 3, Section 4, Section 5, Section 6 or Section 7
Fall protection device for utility poles as described in . 9. The arm 2 of the upper fixing metal fitting 4 is formed in a tapered shape that becomes thinner from the substrate 1 side toward the tip, excluding the joint portion of the guideline 12, etc. Claims 1 and 2. Section 3/4
Fall prevention device for utility poles as described in Section 5, Section 6 or Section 7. 10 The arm 2 of the upper fixture 4 has a cross-sectional shape of a circle, polygon, ellipse, I-shape, H-shape, trapezoid, etc.
Section, Section 2, Section 3, Section 4, Section 5, Section 6,
The fall prevention device for utility poles according to paragraph 7, paragraph 8, or paragraph 9. 11. The arm 2 of the upper fixing fitting 4 is made of a bar material and has a bent portion 19 with a small cross-sectional area in the bending direction near the base end. Section 3, Section 4, Section 5
Section, Section 6, Section 7, Section 8, Section 9 or Section 1
Fall prevention device for utility poles as described in item 0. 12 The support member 3 of the upper fixing metal fitting 4 is made of a bar material and has a narrow diameter part 20 in the middle part which is thinner than the other parts, and when a tensile load of more than a predetermined value is applied to the support member 3, the narrow diameter part 20 Claims 1, 2, and 3 are characterized in that they lose their functions due to damage.
Section, Section 4, Section 5, Section 6, Section 7, Section 8,
The fall prevention device for utility poles according to paragraph 9, paragraph 10, or paragraph 11. 13 The support member 3 of the upper fixture 4 is formed of a ring-shaped member such as a chain 21, and the support member 3
When a tensile load of more than a predetermined value is applied to the chain 21
Claims (1), (2), (3), (4), (5), (6), (7), (8), and (4) which are characterized in that the function is lost due to damage. Section 9/10
The fall prevention device for utility poles according to paragraph 1 or paragraph 11. 14 The support member 3 of the upper fixing metal fitting 4 is made of a rod and has a head 22 at one end thereof, and after passing the support member 3 through the support hole 15 of the substrate 1, the other end is connected and fixed to the arm 2. However, when a predetermined tensile load or more is applied to the support member 3, the head 22 is damaged and loses its function. Section 4, Section 5, Section 6
A fall prevention device for utility poles as described in Item 7, Item 8, Item 9, Item 10, or Item 11.