JP2002201885A - Warning display device of transferable ladder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a falling accident of an operator when the surrounding other person carelessly moves a transferable ladder on which the operator gets and works. SOLUTION: In this transferable ladder 100 having moving wheels 140a and 140b in the lower part, a lower braking operation part 181 and an upper braking operation part 182 for regulating a movement, and a braking releasing means for releasing braking, this ladder 100 is provided with a sensor 320 (an infrared ray sensor) as an operator boarding detecting means for detecting boarding of the operator, a detection control means for flashing a warning indicating lamp 461 when this sensor 320 detects the operator, a display means, and a power source means (a secondary battery).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm display device of a mobile ladder used for a required high place work in a wiring board facility installed in a machine room of an NTT building, for example. The present invention relates to a warning display device of a mobile ladder for notifying another person that a worker is riding when the worker is climbing and working on the mobile ladder.

[0002]

2. Description of the Related Art As a movable ladder as described above, a movable wheel is provided at a lower end of a ladder, and an upper end of the ladder is movably supported along a rail erected on a ceiling.
At normal times, apply the brakes provided on the ladder to restrict movement, release the brakes only when movement is necessary, and allow the worker on the ladder to reach the required distance by applying a hand to the work object. In general, movement control is performed such that the user moves only once and then applies the brake again after the movement.

[0003]

However, in the maintenance work (MDF work) of the wiring board in the above-mentioned machine room, it is inappropriate to apply the brake every time it is moved, and it is necessary to apply the brake. Also, when the worker forgets or neglects to apply the brake after moving, another person may accidentally contact or collide with the ladder and move the movable ladder carelessly. In such a case, the worker working on the ladder may not only fall down from the ladder and cause personal injury such as death or injury, but also may cause There is a risk of causing problems such as damaging equipment due to falling down while holding the terminal or the like. The above-mentioned problems are the same in other types of mobile work platforms such as mobile stepladders and mobile step platforms that work at high places.

[0004] In order to solve such a problem, a prior art in which a voice message is issued to warn the user when a person approaches the ladder or when the brake of the mobile ladder is released in a mobile ladder or the like. Is disclosed in JP-A-10-33141.
Japanese Patent Application Laid-Open No. 56-169098 discloses a prior example in which a step switch is disposed on a side rail of a ladder to detect an operator's treading and issue an alarm. I have.

[0005] In the former prior art, a warning sound is emitted regardless of whether or not a worker is on the movable ladder, so that it is only annoying to other workers and third parties. There is a problem that a noise is generated, and there is also a problem that power is wasted.

Also, in the latter prior example, the reliability of the operation of the step switch is low, and even if the operator steps on the steps correctly, the device may not be turned on or off as desired. If the worker just steps on the steps and does not actually board, or boarding without stepping on the side rail with the step switch, the device will operate even if the worker is not on board. There may be a problem in that the device does not operate even if it is activated or the worker is on board.

The present invention has been made in view of the above problems, and in a mobile ladder, when a worker is on a ladder and is working,
By reliably detecting that the worker is on board and blinking the display means such as light-emitting diodes, it is possible to prevent others in the vicinity from accidentally moving the ladder, and work by moving the ladder It is an object of the present invention to provide an alarm display device capable of preventing a fall accident of a user, an accident of damage to equipment, and the like.

[0008]

In order to achieve the above object, a first invention of the present invention is provided adjacent to a required facility, and has a moving wheel at a lower portion, a brake means for restricting movement, a brake, In the mobile ladder having a brake release means for releasing the vehicle, the ladder includes a worker boarding detection means for detecting the boarding of a worker, a detection control means for blinking an indicator light when the detection means operates, and a display. Means and power supply means.

According to a second aspect of the present invention, based on the alarm display device of the mobile ladder according to the first aspect, the worker boarding detecting means is an infrared sensor, and a power supply means. Is a secondary battery.

According to a third aspect of the present invention, based on the alarm display device for a mobile ladder according to the first or second aspect, the worker boarding detecting means is provided at an upper end of the mobile ladder. The display means is mounted on a vertical support of the part, and the display means is arranged adjacent to a lower braking operation part of the movable ladder.

[0011]

FIG. 1 shows an example of a main part of a mobile ladder used in a wiring board facility of a machine room of each of the aforementioned NTT buildings. FIGS. 2 and 3 show such a ladder. 1 shows an example in which the alarm display device of the present invention is mounted on a mobile ladder.

In FIG. 1, a movable ladder 100 (hereinafter referred to as a “moving ladder”) has a width of, for example, 35 cm to 46 cm.
two pairs of struts 11 facing each other with an interval of about cm
10 to 11 step plates 130 are provided between 1a and 111b and between 112a and 112b. Each column can be composed of, for example, a square pipe of 25 mm × 25 mm. Each step board 130 is installed horizontally, and the vertical interval is set to about 27 cm. In the upper end portion 100a of the moving ladder 100, the columns are vertical, and the uppermost step plate 130 is installed in the middle of the vertical upper end portion 100a.

A suspension 150 is fixed to the upper end 100a of the moving ladder 100. A pair of arms 150a and 150b are formed on the upper part of the suspension 150, and each arm has a roller 161a, 161b and a roller 161a. 162
a, 162b are rotatably locked. Each roller is arranged so as to be able to roll along a rail 200 installed at a height of, for example, 3.2 m to 3.6 m.
The lower end 100b of the movable ladder 100 also has vertical columns, and a pair of wheels 140a and 140b are rotatably locked.

The above-mentioned movable ladder 100 has, for example, a lower braking operation unit 18 below a fifth step board 130 from the bottom.
1 is provided, and an upper braking operation unit 182 is provided, for example, below the uppermost step plate. Each of the brake operation units 181 and 182 can be composed of, for example, a brake lever and a brake release lever. Further, a stopper 260 is connected to a stopper arm 190 rotatably pivoted with respect to the suspension unit 150, and is always pressed against the rail 200 by an elastic member (not shown) to move the moving ladder. Is braking. When the upper braking operation unit 181 or the lower braking operation unit lever 182 is operated, the stopper arm 190 is rotated via the wire 170, and the stopper 2 that normally presses the rail 200 is operated.
The braking can be released by separating the rail 60 from the rail 200.

The alarm display device according to the present invention will be described in detail later. FIG. The alarm display device main body 410 is attached via a mounting bracket 411 at a position immediately below the fourth step board 130 from the bottom so as to bridge the support column. Since this position is adjacent to the lower brake operation unit 182, when another worker who is not on the moving ladder operates the lower brake operation unit 182 to release the brake, the position must always be within the field of view. It is particularly preferable because there is no interference with the operation lever and the like, and the device can be turned on and off and the battery can be replaced in a reasonable posture.

In FIG. 2, reference numeral 320 denotes a sensor for constituting an operator occupancy detecting means. This sensor 320 is provided with a mounting plate 321 in which the uppermost step plate 130, that is, the column is vertical. Immediately below the step plate 130 installed in the middle part of the upper end, it is attached so as to bridge the front supports 111a and 111b. By mounting the sensor 320 near the top of the mobile ladder, especially on a vertically upstanding post, for the entire space where workers on the mobile ladder can board,
Since there is no blind spot, it is possible to reliably detect the worker. The sensor 320 can be, for example, an infrared sensor, and can detect the presence of the worker and transmit a detection signal to the main body 410 when the worker is in the detection range illustrated in FIG. it can. As the infrared sensor, a sensor having desired characteristics, in particular, a sensor having high sensitivity to infrared rays emitted from a human body can be selected from a thermistor bolometer, a thermopile, a pyroelectric infrared sensor, or the like. In addition, as the sensor 320, a microwave Doppler sensor or an ultrasonic sensor can be used. In the case of an ultrasonic sensor, the presence of the occupant can be detected by detecting that L1> L2. In any case, a low power consumption type that can detect a human body at a distance of about 3 to 4 m is desirable. If the sensor is equipped with a sensitivity adjusting device (for example, a variable resistor), the use environment of the moving ladder (temperature, distance to other surrounding objects, etc.),
The detection sensitivity can be adjusted according to the characteristics (body temperature, height, etc.) of the worker, and more reliable worker detection is possible.

FIGS. 4 to 8 show an example of the configuration of an alarm display device according to the present invention. FIGS. 4 and 5 show a sensor and its mounting bracket as detecting means, and FIGS. FIG. 8 is a block diagram of the mounting bracket.

4 and 5, a mounting bracket 321 is shown.
The clamp members 360 are provided symmetrically at the left and right ends of a horizontal rail member 340 having a substantially L-shaped cross section via a connecting member 350. The connecting member 350 has a substantially L-shape, and has a long side 350a formed with a long and narrow hole 351 in the longitudinal direction, and the hanging piece 34 through the long hole 351.
Since it is slidably screwed to the end of the movable ladder 0a, the length of the mounting bracket can be adjusted according to the width interval of the columns 111a and 111b of the movable ladder. In addition, connection fitting 3
The short side 350 b of 50 is connected to one end of the clamp member 360. This connection may be rigid, but if it is pivotable, the crosspiece member 340 can be made rotatable with respect to the moving ladder, and interference with other components of the moving ladder can be prevented. The position of the sensor 320 can be adjusted or adjusted.

The clamping member 360 includes a fastening screw 360
a, a strut receiver 361, and an engagement plate 362. The strut supporter 361 has both ends of a base 361a vertically bent, and a pair of gripping pieces 361b are formed to face each other. Each of the gripping pieces 361b has a substantially U-shaped bent piece 361c on the release side thereof. The openings are formed to face each other. The short side 36 on the release side of the pair of bent pieces 361c
An engagement plate 362 is abutted on 1d so as to extend over the same, and is screwed to two short sides 361d at both ends of the engagement plate 362. Inside the engagement plate 362, a contact portion 362a is formed at a portion that contacts the column 111. The contact portion 362a can be securely fixed to a support as a ridge or a disc-shaped protrusion integrally formed on the engagement plate 362 with the same material, and can be formed of a material such as rubber. Demonstrate the effect of anti-slip.

On the other hand, a sensor mounting table 390 is attached to the left and right centers of the hanging pieces 340a of the horizontal rail member 340 of the mounting bracket 321 via sensor holders 381 and 382. Each of the sensor holders 381 and 382 has an L-shape, and the short sides 381a and 38
2a is screwed to the hanging piece 340a,
A sensor holding space is formed between 1b and 382b. In this sensor holding space, rising portions 390b are formed at both ends of the mounting portion 390a, and a sensor mounting table 390 having an approximately U-shaped cross section opened upward is disposed. The sensor holding hardware is rotatably locked to the long sides 381b, 382b by screws 389a, 389b. Thus, the mounting angle of the sensor mounting base 390 can be adjusted so as to be freely rotatable about a common axis of the screws 389a and 389b (horizontal axis when attached to a movable ladder). Then, a sensor (for example, an infrared sensor) 32 is provided on the sensor mounting base 390.
By screwing 0, the sensor 320 can be installed on the moving ladder. Note that the terms “mounting table” and “mounting on the mounting table” do not limit the direction in which the sensor 320 is mounted on the moving ladder.
May be attached to the mounting table 390 in such a manner that the sensor 320 is suspended from the mounting table 390 by a screw (that is, such that the sensor 320 projects downward from the mounting bracket 321).

6 and 7 show the main body of the alarm display device according to the present invention and its mounting bracket. FIG. 6 is a front view, and FIG.
Is a side view. The main body 410 is formed of a substantially rectangular parallelepiped housing, and a mounting piece 420 having the same width as the lateral width of the main body 410 is integrally formed with the back plate at an upper portion thereof. Here, the mounting bracket 411 is different from the mounting bracket 321 described above in that the sensor holders 381 and 382 and the sensor mounting table 39 are provided.
Since the configuration is the same except for the point lacking 0, only the horizontal rail member 440 having a substantially L-shaped cross section is shown, and the others are omitted. The mounting pieces 420 are connected to the horizontal rail member 440 by screws at two places on the left and right.

The main body 410 is divided into an upper space 450 and a lower space 460. On the left front side of the upper space 450, a first display unit (display lamp 1) 45 indicating a normal charging state is provided.
1 is formed using, for example, an LED,
It is controlled so that it flashes red when charging a secondary battery (for example, a nickel-metal hydride battery) as a power source (not shown) mounted in the unit 0, and lights red when charging is completed. . On the right side of the upper surface of the upper space 450,
A power supply terminal 452 for inputting power during charging is provided. As will be described later, the charger is connected to the main body 410.
When configured as an independent device separately from the above, the first display portion 451 and the power terminal 452 are not necessarily required.

On the other hand, in the center of the front of the lower space 460, an alarm display section (flashing indicator light) 461 as alarm display means is formed using, for example, nine high-brightness LEDs. On the back of the lower space 460, at the position corresponding to the above-mentioned alarm display unit 461 (the left and right center part), an alarm display unit (flashing indicator light) 462 having the same function as the alarm display unit 461 is formed. For example, it is controlled so as to blink in conjunction with the alarm display unit 461.

On the upper left side in front of the lower space 460,
A second display portion (display lamp 2) 464 indicating the degree of power supply battery consumption is formed. For example, when the battery voltage is normal, it lights in green and when the battery voltage falls below a predetermined value. Lights in red. When the battery voltage drops, an alarm buzzer in an alarm unit (not shown) sounds further (for example, continuously oscillates for about 10 seconds). Further, a switch 463 is provided at a lower left portion of the lower space 460, and can turn on and off the alarm display device. The main body 410 is connected to the sensor 320 by an electric wire (not shown) to form an alarm display device according to the present invention.

Here, the sensor 320, the first display unit 45
1, alarm display units 461 and 462, second display unit 464
It is desirable that the power consumption during operation be small, and that the life of the secondary battery be about 8 hours or more in continuous operation. In addition, if the charger is built in the main unit, in the charging operation after attaching to the moving ladder, the charging cord is extended from the indoor wiring AC power supply, or multiple AC power supplies are moved along the moving path of the moving ladder. Since it is troublesome to install terminals, turning on and off such an AC power supply in the MDF room may cause a trouble due to generation of electromagnetic waves. Independent devices. When the charger is an independent device, the second display unit 4
When 64 is displayed or the alarm buzzer sounds and the consumption of the secondary battery is notified, the secondary battery in the main body is replaced with a battery which has been charged by a charger in a separate room in advance.

When attaching to the moving ladder, first, the sensor 320 is attached to the mounting table 390 of the attachment hardware 321, the engaging plate 362 of the clamp member 360 is removed, and
The support columns 111a and 111b form a pair of gripping pieces 36 within 61.
1b so as to be taught by pinching, and the engaging plate 36 is renewed.
2 is screwed together with two screws and temporarily fixed to the column 111, and then the fastening screw 360 a is screwed from behind, and the leading end of the fastening screw 360 a and the contact portion 362 between the inner surface of the engagement plate 362.
a and the column 111 is pinched and fixed. The main body is attached in the same manner, and the sensor 320 and the main body 410 are connected by an unillustrated electric wire cord in order to supply power to the sensor and input a signal from the sensor. Thereafter, if necessary, a test operation of the apparatus is performed, and the sensor mounting table 390 is rotated to rotate the sensor 3.
20 can be adjusted, and the sensitivity of the sensor 320 can be adjusted.

FIG. 8 is a block diagram showing an example of the alarm display device of the present invention. In FIG. 8, when power is input from a power control unit (CN1) via an AC adapter, an indicator lamp 1 of a charging unit is turned on, input power is rectified by a charger, and a control unit as a detection control unit is used. The secondary battery (BAT) is charged via the detection control unit (CN2). After charging is completed, remove the AC adapter and switch S
When W is closed, the power of the BAT is changed to the detection control unit (CN
2) It is supplied to a sensor (SEN) and an oscillator (OSC). The sensor SEN can be configured by a transmitting unit and a receiving unit for electromagnetic waves or the like. The detection control unit (CNT2) to which the reception signal is input from the sensor (SEN) activates the oscillator (OSC) to blink the blinking indicator when the detection signal satisfies a predetermined condition. When the voltage of the rechargeable battery (BAT) becomes equal to or less than a predetermined value and normal operation may not be performed, the undervoltage detection unit (LVD) detects this, and
The display lamp 2 is turned on and the alarm buzzer of the alarm section is sounded. Note that, as described above, the function of the charging unit may be configured as a separate charger.

With the above configuration, when the sensor 320 detects the boarding of the worker, the LED of the alarm display section 461 is displayed.
Flashes to notify other workers or third parties of this. The detection control unit further includes an oscillation unit for a buzzer, a memory as a storage unit and a processor as a reproduction unit, and a warning display unit further includes a sounding unit such as a speaker, so that a buzzer sound as an alarm, a sound, It is also possible to emit music and the like. It is also possible to issue an alarm by wireless oscillation.

(Other Embodiment) FIG. 9 schematically shows an example in which a load sensor is used as the worker detecting means. In FIG. 9, reference numeral 910 denotes a main wheel as a moving wheel, which is rotatably fixed around a first axle 912 fixed to a first wheel receiving plate 911. The auxiliary wheel 920 is rotatably fixed around the second axle 922, but the second axle 922 is fixed to the second bearing frame 980,
The second bearing frame 980 is connected to the auxiliary wheel receiving frame 940 via an elastic member 960.

As a result, the second axle 922 is held movably up and down along a vertically elongated hole 931 provided in the second wheel receiving plate 930. Second bearing frame 98
A pair of switch elements 970 as a load sensor are fixed at positions opposing the 0 and the second wheel receiving plate 930. As the switch element 970, a mechanical switch,
Proximity switches, pressure-sensitive elements, etc. can be used, and more specifically, micro switches, limit switches, reed switches, other magnetic proximity switches, high frequency transmission proximity switches, capacitance proximity switches, etc. Can be. When the worker is not on the moving ladder, the vertical distance h between the first axle 912 and the second axle 922 is maintained at a predetermined value due to the repulsive force of the elastic element 960. The movement of the ladder is performed by rolling of the second wheel 912.

In this embodiment, when the operator gets on the moving ladder, the elastic member 960 is compressed, and the vertical distance h between the first axle 912 and the second axle 922 becomes zero. At this time, the switch element 970 is turned on normally,
A signal indicating that the worker is on board is transmitted to the main body. When the worker gets off the moving ladder 100, the first axle 9
The vertical distance between the second axle 922 and the second axle 922 is
With the sudden force of 60, the vertical distance h returns to the predetermined value again, and the switch element is turned off. By adopting such a configuration, no matter where the operator is on the moving ladder,
Its presence can be reliably detected. Further, since the sensor itself does not emit electromagnetic waves or the like, the sensor itself can be used in a terminal board room or the like without worry. In the sensor of this embodiment,
By further providing a mechanism for changing the elastic constant of the elastic element 960 (for example, a mechanism for changing the position of the support end of the spring), the sensitivity of the sensor can be adjusted according to the weight of the worker and the working environment.

Further, as another embodiment of the power supply means, a solar power generator such as a solar cell can be employed. In this case, since it has conversion efficiency enough to generate electricity using an indoor lamp as a light source, charging, battery replacement, etc. become unnecessary. Prevent accidents,
The need for maintenance work can be reduced.

[0033]

According to the first aspect of the present invention,
Worker presence detection means, detection control means, alarm display means, and power supply means equipped on the mobile ladder reliably detect the presence or absence of a worker on the ladder, and confirm that the worker is on board. The warning and display eliminates the inconvenience of inadvertently moving the ladder around the mobile ladder, thereby preventing casualties and accidents caused by falling workers and equipment damage. be able to.

According to the second aspect of the present invention, by using a secondary battery as the power supply means, it is possible to prevent an adverse effect due to generation of electromagnetic waves due to connection and disconnection of the AC power supply terminal.

Further, according to the third aspect of the present invention, the worker occupancy detecting means is attached to a vertical support at the upper end of the movable ladder, and the alarm display means is provided for lower braking operation of the movable ladder. In addition to the above-mentioned effects, it is possible to detect workers with high accuracy without obstacles to the sensor, and to surely warn the operator of the lower brake operating unit , The display can be recognized.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a mobile ladder to which an alarm display device of the present invention is mounted.

FIG. 2 is a schematic view of an example of arrangement of an alarm display device according to the present invention with respect to a mobile ladder.

FIG. 3 is a diagram showing a detection range of a sensor of the alarm display device according to the present invention.

FIG. 4 is a diagram showing a sensor and a mounting bracket of the alarm display device according to the present invention.

FIG. 5 is a diagram showing a sensor and a mounting bracket of the alarm display device according to the present invention.

FIG. 6 is a front view showing the main body of the alarm display device according to the present invention and its mounting bracket.

FIG. 7 is a side view showing the main body of the alarm display device according to the present invention and its mounting bracket.

FIG. 8 is a block diagram illustrating an example of an alarm display device according to the present invention.

FIG. 9 is a diagram showing another embodiment of the alarm display device according to the present invention.

[Explanation of symbols]

 100: Mobile worktable 100a: Upper end 320: Sensor 410: Alarm display unit 461: Alarm display

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[Procedure amendment]

[Submission Date] January 12, 2001 (2001.1.1)
2)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG. 4

FIG.

FIG. 2

FIG. 3

FIG. 6

FIG. 7

FIG. 5

FIG. 8

FIG. 9

Claims (3)

[Claims] 1. A mobile ladder provided alongside required facilities and having moving wheels, brake means for restricting movement, and brake release means for releasing a brake, wherein the ladder includes Warning display of a mobile ladder, comprising: worker's boarding detecting means for detecting a person's boarding, detection control means for blinking an indicator light when the detecting means operates, display means, and power supply means. apparatus. 2. The alarm display device for a mobile ladder according to claim 1, wherein said worker occupancy detection means is an infrared sensor, and said power supply means is a secondary battery. 3. The mobile ladder according to claim 1, wherein said operator occupancy detection means is attached to a vertical support at an upper end of the mobile ladder, and said display means is disposed adjacent to a lower braking operation part of said mobile ladder. Ladder alarm display.