JPH07158367A - Telescopic ladder and safety device with fall prevention device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a telescopic ladder having a fall prevention device that ensures worker safety and a safety device used for the ladder. [Structure] One of the columns of the telescopic ladder serves as a guide rail of the safety device, and a connecting rail for facilitating passage of the safety device is provided at the telescopic connection portion of the ladder column as the guide rail. There is an expandable telescopic ladder and a safety device used for the same which are equipped with a safety device that is movable in the vertical direction on a column to prevent a worker from falling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extendable ladder having an overhead distribution line, a utility pole of the overhead distribution line, a utility pole branch line or a wall surface of a building, etc. It is about.

[0002]

2. Description of the Related Art Telescopic ladders for working at height are already well known. This ladder is made of aluminum or fiber reinforced plastic, and consists of a combination of upper and lower ladder stanchions.The upper ladder stanchions are slid up to a predetermined height along the lower ladder stanchions by pulleys and ropes, and the upper and lower stanchions are set by the stoppers. Use the ladder column fixed. When it is transported or stored, it is shrunk and loaded on a car, or stored in a storeroom.

However, such a conventional telescopic ladder is not provided with any means for preventing the fall of an operator who works by climbing to the ladder. Therefore, there is a problem in terms of safety for work in high places such as overhead distribution lines.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a telescopic ladder having a fall prevention device ensuring the safety of workers and a safety device used for the same. The feature is that one of the columns of the telescopic ladder is used as a guide rail of the safety device, and a connecting rail for facilitating passage of the safety device is provided at the telescopic connection part of the ladder column as the guide rail. There is a telescopic ladder designed to prevent a worker's fall accident by attaching a safety device to the column so that it can move vertically.

A second feature of the present invention is that the main body of the safety device and the lever attached to the safety device main body include two pairs of rotary rollers and a pressing roller provided inside the safety device body and a pair of rollers provided at the tip of the lever. The claw part holds the guide rail to enable vertical movement, and the claw part of the rotating roller and lever is configured so that its interval is changed at the connection rail installation place provided at the expansion / contraction connection part of the ladder column. In the bowl.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a concrete example of a telescopic ladder main body according to the present invention. FIG. 1 (a) is a side view in which it is leaned against a wall surface (A) of a building, and FIG. It is a figure. In the drawing, 11 is an upper ladder column, 12 is a lower ladder column, and the upper and lower ladder columns 11 and 12 slide the upper ladder column 11 along the lower ladder column 12 by a pulley and a rope (not shown) as described above. It is provided so that it can expand and contract. Then, when the upper ladder column 11 is extended to a predetermined height, the upper and lower ladder columns 11 and 12 are fixed by the stoppers 13.

In the present invention, one of the two upper and lower ladder columns 11 and 12 is used as a guide rail for a safety device 30 to be described later, and the safety device 30 is movably mounted in the vertical direction. . Reference numeral 20 denotes a safety device attachment / detachment port provided in the lower portion of the lower ladder column 12, and has a narrow width as shown in the top view of FIG. As described above, when the upper ladder strut 11 is extended along the lower ladder strut 12, a large step is generated in the expansion joint of the upper ladder strut 11 and the lower ladder strut 12 to prevent passage of this portion of the safety device 30. I will run over. Safety device
In order to facilitate the passage of 30 the connecting rail 14 is provided in the telescopic connection.

2A and 2B are explanatory views of the connection rail 14 provided at the expansion and contraction connecting portions of the upper ladder column 11 and the lower ladder column 12, where FIG. 2A is a top view and FIG. 2B is a side view. The upper surface of the connection rail 14 is tapered, and one end of the connection rail 14 is fixed to the end of the lower ladder column 12 with a bolt or the like.
14a has the same width as the upper surface 12a of the lower ladder strut 12 and is linearly connected to this. The other end 14b of the connection rail 14
Is formed wider than the upper surface 11a of the upper ladder strut 11 and is slidably provided by the upper ladder strut 11 and the guide plate 15. In this way, by providing the connecting rails 14 with tapered top surfaces at the expansion and contraction connecting portions of the upper ladder column 11 and the lower ladder column 12, the safety device 30 can move smoothly on the ladder columns 11 and 12. Becomes

On the top of the upper ladder column 11, a wall lateral deviation preventing device 15 is provided on the side where the upper ladder column 11 contacts the wall surface A. In this, for example, a rubber plate having an uneven surface formed on its one side of an aluminum plate is adhered or integrally formed, thereby preventing lateral displacement of the ladder.

A hanging wire hook 16 is provided outside the top of the upper ladder column 11, and when the ladder is to be hung on an overhead distribution line or the like, the hanging wire hook 16 can be hooked on the overhead distribution line or the like. Stand up. Further, a horizontal displacement fixing rope 17 is attached to the inside of the top of the upper ladder column 11 near the top by hook metal fittings, etc.When the work is carried out by standing on a utility pole such as an overhead distribution line or its branch line, the fixed rope 17 Wrap around the utility pole or stand around it. Furthermore, an open leg member 18 of the lower ladder column 12 is provided, and the member 18 is opened and fixed by an opening stop metal fitting 19 to prevent the sideways rolling of the ladder.

3A and 3B are explanatory views of a specific example of the safety device according to the present invention. FIG. 3A is a top view, and FIG. 3B is a view of FIG.
X1-X1 cross-sectional view, (C) is a view taken along arrow X2-X2 in (A),
FIG. 3D is a bottom view. The safety device 30 is composed of a safety device body 31 and a lever 32 which is mounted on the safety device body 31 with its end portion positioned inside the safety device body 31. The lever is inside the safety device body 31.
A pair of opposed lever claws 35a, 35 provided at the tip of 32
b, two pairs of rotating rollers 33a and 33b sandwiching the lever claws 35a and 35b, and a pressing roller 36 that presses the ladder columns 11 and 12 when they are mounted on the ladder columns 11 and 12.

The lever claws 35a and 35b, the rotary roller
33a and 33b hold the ladder columns 11 and 12 as guide rails from the left and right, and the presser roller 36 presses the upper surfaces of the ladder columns 11 and 12, and the safety device 30 moves the ladder columns 11 and 12 by rotating and sliding them. Move up and down. A spring 37 is attached to each of the rotating rollers 33a and 33b, and a lever claw portion is provided.
A spring 38 is provided between 35a and 35b. Due to the action of these springs 37 and 38, two pairs of rotating rollers 33a,
33b can change the distance between the rotating rollers 33a and 33b and the distance between the lever claws 35a and 35b using the long hole 34 as a guide, and the safety device 30 can be connected to the extension connection of the upper ladder strut 11 and the lower ladder strut 12. It easily passes over the provided connection rail 14.

[0013]

When the operator climbs to the telescopic ladder of the present invention,
Attach the safety device 30 to the lower ladder column 12 as a guide rail from the safety device attachment / detachment port 20 provided at the bottom of the lower ladder column 12.
A ring attached to the lever 32 of the safety device 30 as shown in FIG.
The hook metal fitting 43 at the other end of the rope 42, one end of which is fastened to 41, is hooked on the belt or the like of the worker.

When the worker ascends the ladder in this state, the safety device 30 includes the rotary rollers 33a and 33b, the lever claws 35a and 35b, and the presser roller 36, which are the lower ladder columns 12
, And this is used as a guide rail to rise. At the connecting rails 14 provided at the expansion and contraction connecting portions of the upper ladder strut 11 and the lower ladder strut 12, the rotating rollers 33a, 33 are operated by the springs 37, 38 as described above.
b and the lever claws 35a, 35b are changed in interval and pass through them, and the upper ladder strut 11 and the lower ladder strut 12 as well as the lower ladder strut 12 ascend.

In the unlikely event that the worker falls, the lever 32 of the safety device 30 falls down, so that the lever claw portion 3
The angles of 5a and 35b with respect to the ladder columns 11 and 12 have changed,
Ladder stanchions 11 and 12 that are guide rails at that location
And the safety device 30 stops on the ladder stanchions 11 and 12. As a result, a fall accident of an operator who is connected to the safety device 30 and the rope 42 is prevented.

[0016]

As described above, according to the telescopic ladder of the present invention, one of the ladder columns is used as a guide rail, and a safety device is attached to the guide rail to prevent a worker's fall accident and prevent the operator from falling. Can be safe. Furthermore, in addition to the fall prevention device, by installing a horizontal wall displacement prevention device, a suspension wire hook lateral displacement fixing rope, and a rollover prevention device using a leg opening member, it is possible to further secure the safety of the operator, and the It is extremely effective when used for work in high places such as work related to electric wires.

[Brief description of drawings]

FIG. 1 is an explanatory view of a specific example of a telescopic ladder according to the present invention.
(A) is a side view of a state of standing on the wall surface of a building, FIG.
(B) is a front view.

2 is an explanatory view of a connection rail according to the present invention, and FIG.
2A is a top view, and FIG. 2B is a side view.

3 is an explanatory view of a safety device of the present invention, FIG. 3 (a) is a top view, FIG. 3 (b) is a sectional view taken along line X1-X1 of FIG. 3 (a), and FIG. 3 (c).
Is an X2-X2 arrow view and FIG. 3D is a bottom view.

FIG. 4 is a front view of a safety device attachment / detachment port provided on a lower ladder column.

FIG. 5 is an engagement state diagram of a lever claw with a ladder column and a connection rail.

FIG. 6 is a state diagram in which a rope is attached to the safety device.

[Explanation of symbols]

 10 Ladder main body 11 Upper ladder support 12 Lower ladder support 13 Stopper 14 Connection rail 15 Wall side misalignment prevention device 16 Suspension wire hook 17 Side misalignment fixed rope 18 Opening member 20 Cutout device 30 Cutout device 31 Cutout device body 32 Lever 33a , 33b Rotating roller 34 Oblong hole 35a, 35b Lever claw 36 Presser roller 37, 38 Spring 41 Ring 42 Rope 43 Hook bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kunio Sugiyama 1 Higashishin-cho, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Inc. (72) Inventor Takeshi Naruse 1 Higashi-shin-cho, Higashi-ku, Nagoya, Aichi Chubu Electric Power Co., Ltd. (72) Inventor 82, Nakamura 3-22-8 Shirakabe, Higashi-ku, Nagoya, Aichi Daito Denki Co., Ltd. (72) Inventor, Tomohiro Nakao 1278-1, Narasaki, Kikugawa-cho, Toyoura-gun, Yamaguchi Prefecture (72) Inventor Daisaku Hiroi 2 at 20 Toda, Kitagawara, Itami City, Hyogo Prefecture Inside Asahi Metal Seiko Co., Ltd.

Claims (2)

[Claims] 1. A guide rail of a safety device, wherein one of the columns of the telescopic ladder is used as a guide rail, and a connecting rail for facilitating passage of the safety device is provided at the telescopic connection portion of the ladder column as the guide rail. Telescopic ladder with a fall prevention device, characterized in that a safety device is attached to a pillar support so as to be movable in the vertical direction to prevent a worker's fall accident. 2. A safety device main body and a lever attached to the safety device main body. Two pairs of rotating rollers and a pressing roller provided inside the safety device main body and a pair of claws provided at the tip of the lever hold the guide rail. A safety device characterized in that it is movable in the vertical direction, and that the rotation roller and the claw portion of the lever are configured so that the distance between the claw portions of the rotation roller and the lever is changed at a connection rail installation location provided at the expansion and contraction connection portion of the ladder column.