JPS60165962A - Upper part fixing fittings for falling preventing apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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. The performance required for this type of safety device is to have the strength to withstand the impact load when stopping a fall, and not only to stop and hold a falling human body, but also to absorb and alleviate the impact load that the human body receives when stopping a fall. The Ministry of Labor's standards for safety belts require that the impact load applied to the human body be below 90C)kaf, taking into account the safety limits of the human body against fall impact. Since the design of the device is stipulated, it is necessary to have a device with excellent shock absorbing properties.In view of the current situation, the present invention is designed to prevent fall prevention devices installed on utility poles, etc., from having a rigid structure up to a predetermined residual weight. The object of the present invention is to provide an upper fixing metal fitting which plastically deforms to absorb and alleviate the impact when subjected to an impact load of a predetermined value or more.

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

As shown in the figure, this embodiment consists of a main body A and a support member B, and the main body A is formed by pressing a large head piece 15 using a plate material.
A cutout 18 is provided at the central outer edge of the large head piece 15, and the edges on both sides of the cutout 18 are folded to one side. After bending, the pole pieces 19 are welded together, and the pole band attachment holes 5, 5 are provided at both ends of the large head piece 15, and support member attachment holes 6, 6 are provided inside the pole band attachment holes 5, 5. A notch 20 is provided at the center of the tip, and guideline attachment holes 7 are provided on both sides of the notch 20, and a bottom portion is left at the center in the length direction of the leg piece 16, and both sides are attached to the utility pole support piece 15. By bending in the same direction and providing opposing side wall parts 17.17, the part that was the leg part 16 becomes the arm part 2, and the part that was the large head part 15 becomes the base part 1, and the base part 1
The arm part 2 is formed into an approximate L-shape, and the side wall part 17.degree. 17 of the arm part 2 is formed into a tapered shape that becomes thinner from the base 1 side toward the tip.

Support member B is made by cutting a bar into a predetermined length as shown in FIG.
In the middle part, a narrow diameter part 11 which is thinner than other parts is provided by press working or lathe work, and in both ends, a bulging joint part is provided and a connecting hole 9 is bored therein. The support member B is inserted into the support member attachment hole 6 of the base 1 of the wart A. The base 1 of the main body A and the arm 2 are installed via a shaft between the guideline attachment hole 7 of the arm 2 and the
and the support member B form the upper fixing fitting of the present invention having a truss structure. Incidentally, when the distal end of the arm portion 2 and the distal end of the support member B are pivotally connected, the connecting fitting 8 of the guideline 13 is also pivotally connected.

To use the present invention, as shown in FIG. The upper fixing metal fitting is attached to a predetermined position on the electric pole by inserting and tightening the electric pole band to fix the electric pole band, and the upper end of the guideline 13 is attached to the connecting metal fitting 8 which is riveted together with the support member B to the guideline attachment hole 7 at the tip of the arm part 2. The lower end of the guideline hanging down is attached using a lower mounting bracket C separately attached to the lower part of the utility pole P. In this way, the upper fixing metal fitting for a fall prevention device of the present invention is permanently installed on a utility pole.

A worker who performs construction work on a utility pole goes to the site with a safety device 14 and attaches the safety device 14 to the guideline 13. Thereafter, a hook (not shown) of a safety belt worn on the worker's body is connected to the safety device. When the worker moves up and down the utility pole in this state, the safety device 14 moves up and down on the guideline as the worker moves.

When a worker slips and falls while ascending or descending, the safety device 14 immediately grabs the guideline 13 to stop the worker and restrain the worker. At this time, a high impact load of 1200 k(]fmJ is applied to these fall prevention devices, including the upper fixing metal fittings, and the worker's body.The plastic design was applied to buffer this impact load. This is an upper fixing metal fitting for a fall prevention device according to the invention.

Normally, the guideline 13 has about 2
00kof of tension is added. This 200k
Under loads before and after Off, the upper fixing metal fitting is still in an elastic region due to its truss structure, so it does not deform. However, if a high impact load is applied to the tip of the arm part 2 of the upper fixing bracket when stopping the fall, the small diameter part 1 of the support member B that supports the arm part 2
1 breaks due to the tensile load, and then the arm portion 2 gradually curves and deforms from the tip due to its tapered shape.
This deformation absorbs and alleviates the impact load. The waveform of the impact load measured using an oscillograph at this time is as shown in FIG. 8, and can be kept at around 600 kOf. The first conspicuous mountain-like waveform (600 kgf) is the load when the small diameter portion 11 of the support member B cuts, and the second gentle mountain-like waveform is due to the load when the arm portion 2 bends and deforms. It is a load. In this way, in the present invention, the impact load is absorbed and alleviated by using plastic design to convert the impact load energy into cutting of the support member B and deformation of the arm part 2 to prolong the time required to stop the fall. This helps keep workers safer.

Moreover, this buffering effect 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.

Furthermore, the main body A of the upper fixing fitting of the present invention is integrally formed by press working, so it is lightweight but reinforced by the side walls 17.17, etc.; In order to prevent separation in the outer circumferential direction, it is welded, making it durable and economical.

In addition, the arm portion 2 of the main body A is formed into a tapered shape that becomes rougher from the base 1 side toward the tip, so when stopping an impact load, the deformation starts from the tip and gradually changes depending on the size of the load. The deformation moves toward the thicker side of the base 1, thereby preventing damage to the main body A itself and providing a smooth cushioning effect.

FIG. 5 shows the second embodiment of the support member B of the present invention! 15'il and cut to a predetermined size. Three holes are punched in series at both ends of the bar, and the center of the coupling fitting 10 is pressed into a U-shape with holes on each side. This embodiment differs from the first embodiment in that the holes are fixed by welding or screwing after insertion, and the other two holes are used as connecting holes 9, but the dimensions and working effects are the same.

, FIG. 6 shows a third embodiment of the support member B of the present invention, in which a round ring made of the same material as the main body of the support member 8 is attached to a portion corresponding to the coupling fitting 10 used in the second embodiment. This differs from the first and second embodiments in that it is used and welded, but the other working effects are the same.

FIG. 7 shows a fourth embodiment of the present invention, in which the arm portion 2
This is different from the first embodiment in that the arm 2 projects diagonally upward relative to the base 1, but in this case, by increasing the range of deformation (movement) of the arm 2, the buffer time can be increased accordingly. This embodiment is the same as the first embodiment except that the support member B can be shorter in size.

FIG. 9 shows a fifth embodiment of the present invention, in which the guideline attachment hole 7 at the tip of the arm portion 2 provided in the first embodiment is replaced with the support member attachment hole 22 and the guideline coupling hole 2.
3. The aim is to reduce the assembly time and product weight caused by attaching the connecting fittings 8 with rivets, and also to make the narrow diameter part 11 of the supporting member B stand on a telephone pole. Although it differs from the first and fourth embodiments in that it is provided within the piece 19, the rest is the same.

Furthermore, the conditions for plastic deformation at the time of crushing according to the present invention can be easily adjusted by changing the thickness or material of the plate material forming the main body. Further, the function of the support member B, that is, the function of holding the elastic region of the arm portion 2, can be easily changed by changing the cross-sectional area of the narrow diameter portion. .

[Brief explanation of the drawing]

Fig. 1 is a front view showing the present invention attached to a telephone pole, Fig. 2 is an exploded view of the main body, Fig. 3 is a front view of the main body, Fig. 4 is a support fitting, and Fig. 5 is a view of the support fitting. 2nd embodiment, FIG. 6 shows the third embodiment of the support fitting, FIG. 7 shows the second embodiment of the main body, and the eighth embodiment
The figure is a waveform diagram showing an oscillographic impact load value when the present invention is used, and FIG. 9 is a third embodiment of the main body. In the figure, 1 is the base, 2 is the arm, 5 is the utility pole band attachment hole, 6 is the support member attachment hole, 7 is the guideline attachment hole,
9 is a connecting hole, 10 is a coupling fitting, '11 is a small diameter part, 12 is a mounting bolt, 13 is a guideline, 14 is a safety device, 15
16 is a human head part, 17 is a side wall part, 18.20
is the main body, B is the support member, C is the lower mounting bracket, and P is the utility pole. Patent applicant Tokyo Electric Power Co., Ltd. Nasu Electric Iron Works Co., Ltd. Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 → Time (Sec) Figure 9 Jikou) 1982
July 19th, 2015 Kazuo Wakasugi, Commissioner of the 14th Amendment, 2. Name of the invention: Upper fixing bracket for Canadian fall arrest system 3. Relationship with the Ministry of Amendment 1. Representative Patent Applicant: 079 -02 Oki Hakano (07954) 8-33 (3
0 Riki Togun Takinocho Shimotakino 1 Fujii Denkou Fujii Electric Works Co., Ltd. 1220-1 Shikosuno, Kasuno-cho, Kato-gun, Hyogo Prefecture 4, Subject of amendment 1) Detailed description of the invention column 2) Drawings for the specification Column 3) “Brief explanation of
Corrected with Example J. ■ Correct ``U 5th example on page 9, line 17 of Mingyu 1 mountain'' to ``3rd example J''. ■ Correct the above [Example 1.4-] on page 10, line 5 of the specification box.
The above-mentioned first and second embodiments] are corrected. 2) In box 10, lines 16-17 of the specification, [Fig. 14 shows the support fitting, Fig. 5 shows the second embodiment of the support fitting, and Fig. 6 shows the third embodiment of the support fitting]. The figure shows a support member, and FIG. 5 shows a second embodiment of the support member.
FIG. 6 shows a third embodiment of the support member. 3) In Figure 3 of the drawings attached to the application, add the red-colored code to the drawing attached to the amendment filing of this procedure.

Claims (1)

[Claims] 1) A base 1 and an arm 2 protruding from the lower part of the base 1
A main body A is formed, and a truss structure is formed by connecting the tip of the arm part 2 and the middle part of the base 1 in the main body A by a support member B, and the tip of the arm part 2 is subjected to a downward impact load of more than a predetermined value. An upper fixing bracket for a fall prevention device characterized in that when a shock is applied, the support member B loses its support function and the arm portion 2 curves downward to buffer the impact. 2) The main body A is a press-molded product using a plate material, and when unfolded, it forms an approximate T-shape, and by bending the leg part 16 to one side, the base part 1 and the arm part 2 are formed. The upper fixing metal fitting for a fall prevention device according to claim 1, characterized in that the metal fitting has an approximately cursive shape. 3) The base 1 is bent to form a utility pole band attachment hole 5 at the opposing upper end and a support member attachment hole 6 at the middle, and the arm 2 has a tapered shape that becomes thinner from the base 1 toward the tip. The upper fixing metal fitting for a fall prevention device according to claim 1 or 2, characterized in that a guideline attachment hole 7 is bored in the tip portion. 4) - The support member B is forged and has a rod shape with connecting holes 9 at both ends, and has a narrow diameter part 11 in the middle part. The upper fixing metal fitting for a fall prevention device according to claim 1, 2, or 3, wherein the part 11 is damaged and loses its function. 5) The support member B is made of a bar, with connection holes 9 at both ends.
A coupling fitting 10 etc. with The upper fixing metal fitting for a fall prevention device according to claim 1, 2, or 3, characterized in that it loses its function.