JPH09135914A - Accidental fall preventing safety device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an accidental fall preventing safety device which is reliable and certainly prevents an accidental fall with a simple structure. SOLUTION: This safety device comprises a guide rail 10 which has guide holes 12 opened at a predetermined pitch and is fixed to steel towers of a power-transmission line or the like; a safety device body 16 which is engaged with the guide rail 10 and provided slidably in the longitudinal direction of the guide rail 10; a roller 18 attached to the safety device body 16 and is resiliently engaged with each of the guide holes 12; and a brake lever 20 attached to the safety device body 16 so as to be rocked. An end of the brake lever 20 is attached to the guide rail 10 so as to be pressed against the guide rail 10 and a safety rope 40 is attached to the other end. When the safety rope 40 is pulled to the down side of the guide rail 10, the end of the brake lever 20 is strongly pressed against the guide rail 10 and is rocked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention safety device for preventing a fall accident when working on a steel tower.

[0002]

2. Description of the Related Art A conventional fall prevention safety device of this type is disclosed in Japanese Patent Application Laid-Open No. 55142868 and others.
There is a safety device that is engaged with a guide rail of a steel tower, and has a flywheel that slows down the fall speed and a brake lever that presses against the guide rail to prevent the fall when a fall occurs.
Further, as disclosed in Japanese Patent Publication No. 59-7460 and others, there is also one which does not have a flywheel and prevents the fall by the brake lever being pressed against the guide rail due to the weight at the time of falling.

[0003]

In the former case of the above-mentioned prior art, a gear mechanism such as a flywheel is provided, the flywheel requires a certain amount of mass, and the weight of the entire safety device is extremely heavy, which is inconvenient to carry. It was In particular, when going up the tower, the worker had to put this heavy safety device on his waist and go up along the guide rail, which was a heavy burden. Further, in the latter case of the above-mentioned conventional technology, the flywheel is not provided and the overall weight is light, but it suddenly stops when the frictional force between the brake lever and the guide rail becomes more than a certain value when dropped. , There is a case that the impact is large and the operator's body is heavily loaded. Moreover, the brake lever is almost free from the guide rail when moving up and down, and the safety device is sensitively formed to ensure reliable operation, and the lock is apt to operate even during normal descent. . Further, when locked, it must be released one by one, which is troublesome, and if it is difficult to lock it, there is a risk that it will not operate in the unlikely event that this contradictory problem cannot be solved.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a fall prevention safety device having a simple structure, capable of reliably preventing a fall, and providing a sense of security. .

[0005]

According to the present invention, there is provided a guide rail fixed to an iron tower such as a power transmission line having guide holes formed at a constant pitch, and a longitudinal direction of the guide rail engaged with the guide rail. Direction, a safety device body slidably provided, a roller attached to the safety device body and elastically engaged with the guide hole, and a brake lever swingably attached to the safety device body. One end of the brake lever is provided so as to be capable of pressure contact with the guide rail, a safety rope is attached to the other end, and when the safety rope is pulled below the guide rail, one end of the brake lever is provided. Pushes the guide rail strongly and oscillates so as to make pressure contact, and when the safety rope is pulled upward, one end of the brake lever is separated from the guide rail. Is a fall protection safety device to be. A biasing member such as a coil spring that constantly biases one end of the brake lever in a direction away from the guide rail, and a biasing member such as a coil spring that biases the roller toward the guide hole. It is provided.

In the fall prevention safety device of the present invention, the brake lever surely presses the guide rail against the guide rail when the vehicle crashes to fix the safety device main body on the guide rail to protect the worker and prevent the roller from rolling. While sliding elastically in the guide holes of the guide rails, it slides in the vertical direction and acts as a resistance when descending during a fall to soften the impact, and during normal ascent and descent, a click feeling is generated, and this fall prevention safety device Ensures operation.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The fall prevention safety device of this embodiment has guide holes 12 formed at a constant pitch and is attached to an I-shaped guide rail 10 fixed to a steel tower such as a power transmission line (not shown). A safety device body 16 is slidably attached to the rail 10. The safety device main body 16 has four pairs of holding rollers 14 and 15 that hold the guide rail 10 from both sides at four corners, and is provided so as to be movable along the longitudinal direction of the guide rail 10. The safety device body 16 is further provided with a roller 18 that elastically engages with the guide hole 12 and a brake lever 20 that is swingably attached to the safety device body 16.

The roller 18 is rotatably attached to a holding member 24 by a rotary shaft 22, and the holding member 24 is a sliding hole 27 of a fixing member 26 fixed to the safety device body 16.
The inside is provided so as to be capable of reciprocating in a direction perpendicular to the surface of the guide rail 10. Further, the holding member 24 is constantly urged by a coil spring 28, which is an urging member, toward the surface of the fixed member 26 in which the guide hole 12 of the guide rail 10 is formed in the sliding hole 27. Coil spring 28
Is attached to the sliding hole 27 by being compressed by the screw member 30 to a predetermined depth, and the urging force can be adjusted by the screwing amount of the screw member 30. Also, the screw member 3
0 is securely locked at a desired position by a fixing knob 32 screwed to the fixing member 26.

The brake lever 20 is a safety device body 16
Is pivotally supported by a swing shaft 34 attached to the one end portion 3
A pressure contact member 36, which is in pressure contact with the guide rail 10, is fixed to the rail 5 by a screw 37. A mounting shaft 42 to which a safety rope 40 is mounted is fixed to the other end 38. The brake lever 20 is constantly biased in the swinging direction via a pressing member 45 by a pair of coil springs 44, which are biasing members attached to the fixing member 26. This urging direction is a direction in which the one end portion 35 of the brake lever 20 is separated from the surface of the guide rail 10. The pressing member 45 is slidably provided by being urged in the pair of through holes 46 formed in the fixing member 26 in the protruding direction.

In the fall prevention safety device of this embodiment, the safety device main body 16 can be made of a light metal such as an aluminum alloy, and a carbon fiber reinforced resin or the like can also be used. Further, the roller may be made of resin or carbon fiber reinforced resin.

In the fall prevention safety device of this embodiment, the worker attaches the safety rope 40 to the waist during normal ascent / descent,
The safety device body 16 slides along the guide rail 10 so as to hang down. At this time, in this fall prevention safety device, the brake lever 20 swings clockwise in FIG. 1 due to the pressing member 45 and its own weight, and the pressure contact member 36 moves up and down with almost no sliding contact with the surface of the guide rail 10. Does not act as a resistance. Further, at the time of ascending and descending, the roller 18 moves up and down while engaging with the guide hole 12 and ascends and descends, and the worker can ascend and descend while feeling the click of the roller 18 biased by the coil spring 28.
The device is reliably operational.

In the event of a crash, the brake lever 20 is rotated counterclockwise in FIG. 1 by the weight of the worker, and the pressure contact member 36 strongly presses against the surface of the guide rail 10. In addition, at the time of a fall, since the engagement force with which the roller 18 engages the guide hole 12 is higher than the weight of the fall prevention safety device, the fall prevention safety device may fall along the guide rail 10 together with the worker. There is no. Further, the roller 18 slides while elastically engaging with the guide hole 12 of the guide rail 10, and this engaging force acts as a resistance when descending at the time of a crash, so that the brake lever 20 completely moves. Relieves the impact of biting into.

The fall prevention safety device of the present invention is not limited to the above-mentioned embodiment, and the forms of the roller urging means and the brake lever can be appropriately set.

[0014]

The fall prevention safety device of the present invention utilizes the pressure contact of the brake lever and the elastic engagement force of the roller to enhance the safety during the ascent and descent, and to provide the user with a sense of security. It can be a fall prevention safety device. Moreover, it is small, lightweight, and easy to handle.

[Brief description of the drawings]

FIG. 1 is a sectional view taken along line AA of FIG. 4 showing an embodiment of a fall prevention safety device of the present invention.

FIG. 2 is a sectional view taken along line BB in FIG. 3, showing an embodiment of the fall prevention safety device according to the present invention.

FIG. 3 is a left side view showing an embodiment of the fall prevention safety device of the present invention.

FIG. 4 is a front view showing an embodiment of a fall prevention safety device according to the present invention.

5 is a cross-sectional view taken along the line CC of FIG. 4, showing an embodiment of the fall prevention safety device of the present invention.

FIG. 6 is a vertical cross-sectional view showing a brake lever of an embodiment of a fall prevention safety device according to the present invention.

[Explanation of symbols]

 10 Guide Rail 12 Guide Hole 16 Safety Device Main Body 18 Roller 20 Brake Lever 28,44 Coil Spring (Biasing Member) 40 Safety Rope

Claims (2)

[Claims] 1. A guide rail fixed to a steel tower having guide holes formed at a constant pitch, and a safety device main body engaged with the guide rail and slidable in the longitudinal direction of the guide rail. And a roller attached to the safety device body and elastically engaged with the guide hole, and a brake lever swingably attached to the safety device body. One end of the brake lever has the guide rail. The safety rope is attached to the other end, and when the safety rope is pulled below the guide rail, one end of the brake lever swings so as to come into pressure contact with the guide rail, A fall prevention safety device in which one end of the brake lever is separated from the guide rail when the safety rope is pulled upward. 2. A biasing member for constantly biasing one end of the brake lever in a direction away from the guide rail, and a biasing member for biasing the roller toward the guide hole. The fall prevention safety device according to Item 1.