JP2005065736A - Lifeline device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifeline device which prevents people from falling and reduces the labor when people climb up a ladder or the like. <P>SOLUTION: The lifeline device 10 used for people to go up or go down is equipped with a lifeline 33 connected to him/her, a reel 30 which is placed above a point to which he/she climbs up and is capable of winding up the lifeline 33, and a control button 36 for controlling to wind up the reel 30 and the stopping. Moreover, the reel 30 is equipped with an air motor 32 and a drum 31 for winding up the lifeline 33, and the air motor 32 rotates the drum 31. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lifeline device when a person moves up and down on a ladder or the like in a pothole, and more particularly to a lifeline device that reduces the labor of a rising person.
[0002]
[Prior art]
Conventionally, as a fall prevention device that prevents a worker at an aerial work site such as a utility pole from falling, the take-up reel and the center position engage with the core of the take-up reel and are pulled out to both sides of the take-up reel. A hook that is engaged with a member at the work site at the high altitude is provided at one end, a lifeline that is connected to the body of the operator at the other end, and a winding reel that is provided in the take-up reel. And a spring for winding the lifeline on both sides of the take-up reel at the same time, and a spring provided on the take-up reel, and when the operator crashes, the core is locked by centrifugal force. There is a crash prevention device including an emergency lock mechanism (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP-A-8-215326 (page 2-3, FIG. 1-2)
[0004]
[Problems to be solved by the invention]
However, in the above conventional example, the lifeline is wound around the reel by the spring of the reel, and one end of the lifeline is engaged with a member at a work site at a high place, and the other end of the lifeline is connected to the worker's body. The length of the lifeline is automatically adjusted by the spring force according to the lifting and lowering movement of the lifeline, and if the operator falls off the foot by foot, the core is urgently locked. Since the length does not extend, the operator can be prevented from falling, but the biasing force of the spring is very insufficient to pull the operator upward, so when the operator ascends the ladder or the like, The labor of the operator could not be reduced.
Therefore, the problem to be solved by the present invention is to provide a lifeline device that prevents a person from falling when a person such as an operator ascends a ladder or the like and reduces the labor of the person.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is a lifeline device used when a person (including an operator) moves up and down, and a lifeline that can be connected to the person, and the person is raised. A lifeline which is disposed above a reaching point and capable of winding the lifeline (for example, a reel powered by a motor) and a control means for controlling the winding and stopping of the winding means. Device.
Thereby, the lifeline is connected to the person (for example, the hook connected to the end of the lifeline is locked to the safety belt hung on the waist of the person), and the winding means controlled by the control means winds up the lifeline. Therefore, the labor when a person tries to rise can be reduced. Furthermore, even when a person is climbing a ladder or the like when he / she is climbing a ladder, for example, the person is suspended by the lifeline due to the force to wind up the lifeline of the winding means.
[0006]
Further, the invention according to claim 2 is the invention according to claim 1, wherein the winding means includes an air motor and a winding core (for example, a drum) for winding the lifeline, and the air motor rotates the winding core. is there.
As a result, the core that is rotated by the air motor winds up the lifeline, so the load on the lifeline suddenly increases in the case where the person who connected the lifeline, for example, stepped off the foot while climbing the ladder etc. However, the operation of the air motor resistant to overload does not become abnormal, and the air motor stops with respect to the overload, so that the person who has stepped on the foot is suspended by the lifeline.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a plane of a pothole in which the lifeline device of the present invention is installed. In FIG. 1, potholes 1 and 2 are opened in the ground 3, and a lifeline device 10 having the same structure is attached to each of the potholes 1 and 2. Compressors 11, 12 are provided on the ground 3 near the potholes 1, 2, and air (compressed air) generated by the compressors 11, 12 is sent to each lifeline device 10 via a hose 13. Air does not worry about explosion or ignition and is not affected by humidity.
Side walls 4 and 5 are provided along the edges of the potholes 1 and 2, respectively, and openings 6a and 5a of the side walls 4 and 5 are provided with steps 6 and 7 for descending into the potholes 1 and 2, respectively.
[0008]
FIG. 2 is a perspective view of the lifeline device 10 as seen from the outside of the side wall 4, and FIG. 3 is a perspective view of the lifeline device 10 as seen from the inside of the side wall 4.
In FIG. 3, step 6 includes a scaffold 6 a, a handrail 6 b of the scaffold 6 a, and an entrance 6 c to the ladder 40 that descends into the pothole 1.
The ladder 40 is installed from the entrance 1a of the pothole 1 to the bottom 1b. The worker 50 can transfer from the step 6 to the ladder 40 and get down to the bottom 1 b of the pothole 1.
[0009]
The lifeline device 10 includes a control box 14, an operation box 36 connected to the control box 14, a reel 30 controlled by the operation box 36, a lifeline 33 wound on the reel 30, and the like. The compressor 11 (see FIG. 1), the control box 14, the operation box 36, and the reel 30 are sequentially connected by the hose 13.
[0010]
The column 21 is erected on the ground 3 near the side wall 4 (see FIG. 2), the bent portion 22 at the top of the column 21 is provided above the upper end of the ladder 40, and the reel 30 is located at the bent portion 22. It hangs and is located above the reaching point (upper end portion of the ladder 40) where the worker 50 ascends.
The reel 30 includes a drum 31 that winds and rewinds the lifeline 33, a forward and reverse air motor 32 that rotates the drum 31 forward and backward, and a lock mechanism (not shown) of the drum 31. The reel 30 corresponds to “winding means” in claim 1, and the drum 31 corresponds to “winding core” in claim 2.
[0011]
The rotation speed of the air motor 32 is 45 rpm, for example, and is reduced to 1/20, for example, and transmitted to the drum 31. For this reason, the driving torque of the drum 31 is sufficient to wind up the lifeline 33. Further, since the air motor 32 can absorb the impact force, it is safe even if it is overloaded, and further, there is no need for electrical insulation, and safety is improved.
[0012]
A hook 34 is attached to the tip of the lifeline 33, and this hook 34 can be detachably locked to a safety belt 51 of an operator 50 who moves the ladder 40 up and down. Otherwise, it will not come off. The worker 50 corresponds to a “person” in claim 1.
[0013]
When air is not supplied to the air motor 32, for example, when the worker 50 connected to the lifeline 33 slides his / her foot from the ladder 40 and the load applied to the lifeline 33 increases abruptly, the drum 31 moves to the lifeline 33. When the rewinding speed exceeds a predetermined speed, the locking mechanism is actuated by the centrifugal force caused by the rotation of the drum 31 and the rotation of the drum 31 is forcibly stopped, so that the worker 50 is suspended by the lifeline 33. The crash of the worker 50 can be prevented. For this reason, the reel 30 also serves as a fall prevention device for the worker 50.
[0014]
The operation box 36 has an air switching valve, corresponds to “control means” in claim 1, and is installed in the vicinity of the upper end portion of the ladder 40. Note that the operation box 36 may be installed in step 6 as indicated by a two-dot chain line. The air switching valve of the operation box is for blocking the passage of air and switching the air passage port to one of two outlets.
[0015]
The operation box 36 is provided with an operation lever 36a. By operating the operation lever 36a, the air motor 32 is rotated forward and backward.
Specifically, when the operation lever 36a is in the neutral state, the air switching valve of the operation box 36 prevents the air from passing, so the air motor 32 of the reel 30 is not driven. When the operation lever 36a is tilted downward, the air switching valve is actuated to send air to the forward rotation inlet of the air motor 32, so that the air motor 32 rotates forward and the reel 30 winds up the lifeline 33. On the contrary, when the operation lever 36a is tilted upward, the air switching valve is operated to send air to the reverse rotation inlet of the air motor 32, so that the air motor 32 is reversed and the reel 30 winds down the lifeline 33.
[0016]
A string 38 is connected to the tip of the operation lever 36a, and the length of the string 38 is such that the lower end of the string 38 reaches the bottom 1b of the pothole 1. For this reason, when the operator 50 descending to the bottom 1b pulls the string 38 downward, the operation lever 36a falls down and the reel 30 winds up the lifeline 33.
[0017]
The control box 14 incorporates a speed control valve (not shown) and is attached to the outer surface of the side wall 4 (see FIG. 2). The speed control valve can adjust the flow rate of the air sent from the compressor 11 to the air motor 32 of the reel 30 through the operation box 36, and thereby the rotation speed of the air motor 32 can be changed steplessly.
[0018]
The operation of the lifeline device 10 having the above configuration will be described with reference to FIGS. FIG. 4 is a flowchart showing the descending operation of the lifeline apparatus 10, and shows steps S1 to S9. FIG. 5 is a flowchart showing the ascending operation of the lifeline device 10, showing steps S11 to S19.
[0019]
(Descent action)
The operation lever 36a of the operation box 36 is in a neutral state (S1). In this neutral state, compressed air is not supplied to the air motor 32. Here, the hook 34 at the end of the lifeline 33 of the reel 30 is put on the safety belt 51 of the worker 50 (S2). Then, the ladder 40 installed on the side wall of the pothole 1 is lowered (S3). In this state, it functions to prevent the worker 50 from falling. In other words, if the operator 50 drops his / her foot from the ladder 40 and falls (YES in S4), the lifeline 33 of the hook 34 hung on the safety belt 51 is pulled rapidly, so the lifeline 33 of the reel 30 is wound. The locking mechanism is actuated by the centrifugal force generated by the rotation of the drum 31, and the rotation of the drum 31 is abruptly stopped. The worker 50 is suspended by the lifeline 33 (S5).
When the worker 50 gets down to the bottom 1b of the pothole 1 (S6), the hook 34 is removed from the safety belt 51 (S7).
[0020]
When the second worker 50 is to use, the worker gets on the step 6 and confirms the safety of the worker 50 lowered to the bottom 1b of the pothole 1 (S8). 33 is wound up (S9). At that time, it is desirable to be careful not to overwind. Next, the operation lever 36a is set to the neutral state (S1), and the steps after S2 are repeated. Further, the case where the third and subsequent workers 50 use is the same as that of the second person.
Basically, when the worker 50 is at the bottom 1b of the pothole 1, the lifeline 33 is kept in a lowered state. This is because the worker 50 can use the lifeline 33 immediately.
[0021]
(Climbing action)
The operation lever 36a of the operation box 36 is in a neutral state (S11). The operator 50 in step 6 confirms the safety of the operator 50 who has lowered (S12), raises the operation lever 36a of the operation box 36, and lowers the lifeline 33 (S13). Next, when the lowered operator 50 puts the hook 34 at the tip of the lifeline 33 on the safety belt 51 on his / her waist (S14) and pulls the string 38 connected to the operation lever 36a, the operation lever 36a is moved downward. The reel 30 falls and the lifeline 33 is wound up (S15). The worker 50 ascends the ladder 40 while being pulled upward by the lifeline 33 to be wound up (S16). For this reason, the labor for the operator 50 to raise the ladder 40 is reduced. At this time, when the worker 50 is likely to fall off the ladder 40, the hoisting force of the reel 30 prevents a sudden drop and prevents the worker 50 from falling. In most cases, the reel 30 stops. When it is completely lifted (S17), the operation lever 36a is set to a neutral state so that no air pressure is applied to the air motor 32 (S18), and the hook 34 is removed from the safety belt 51 (S19).
[0022]
When the second worker 50 uses, S12 and subsequent steps are repeated.
At the end of the work, the lifeline 33 is wound up and the operation lever 36a is set to the neutral state.
[0023]
In the above embodiment, an air motor is used for the reel. However, the present invention is not limited to this, and an electric motor, a hydraulic motor, or the like can also be used.
Further, the control box and the operation box are arranged separately from the reel, but the present invention is not limited to this, and the control box and the operation box may be attached to the reel.
[0024]
【The invention's effect】
According to the first aspect of the present invention, for example, even if a person climbing a ladder or the like in a pothole steps off, the person can be prevented from falling, and the labor for the person to climb can be reduced.
Furthermore, according to the invention described in claim 2, in addition to the effect of the invention described in claim 1, even when a person climbing a ladder or the like, for example, steps off his / her foot from the ladder or the like, the person can easily fall. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a plan view showing a pothole in which a lifeline device of the present invention is installed.
FIG. 2 is a perspective view of the lifeline device as seen from the outside of a side wall.
FIG. 3 is a perspective view of the lifeline device as seen from the inside of a side wall.
FIG. 4 is a flowchart showing a descending operation of the lifeline device.
FIG. 5 is a flowchart showing an ascending operation of the lifeline device.
[Explanation of symbols]
10 Lifeline device 30 Reel (winding means)
31 drum (core)
32 Air motor 33 Lifeline 34 Hook 36 Control box (control means)
36a Operation lever 40 Ladder 50 Worker (person)
51 Safety belt

Claims (2)

A lifeline device used when a person goes up and down,
A lifeline connectable to the person;
A winding means arranged above the reaching point where the person ascends and capable of winding the lifeline;
A lifeline device comprising control means for controlling winding and stopping of the winding means. A lifeline device according to claim 1,
The lifeline device, wherein the winding means includes an air motor and a winding core that winds up the lifeline, and the air motor rotates the winding core.

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