JP3279902B2 - Drop load range alarm system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for alerting a worker immediately below a suspended load of a range of falling of the suspended load. In a work site using a crane, it is desired to surely avoid human damage due to the drop of the crane hanging load.

[0002]

2. Description of the Related Art A camera is attached to the end of a crane's boom, and a monitor is provided near the operator's seat of the crane. The camera at the end of the boom points downward and shoots the ground in a position where the suspended load fits into the field of view, and the monitor displays the image shot by the camera.

[0003] When the operator of the crane confirms the worker in the monitor image, he operates an alarm switch provided near the driver's seat of the crane. As a result, the crane's buzzer sounds an alarm, and the worker immediately below the suspended load retreats to a safe position.

[0004]

When a crane operator is distracted by a suspended load, the confirmation of the monitor image becomes sparse. Also, when the suspended load is large or when the suspended position of the load is near the boom tip, the suspended load portion becomes a blind spot on the monitor screen, and it is not possible to confirm the worker immediately below the suspended load.

Further, it is difficult to hear a buzzer warning sound in a loud noise site. And the hearing-impaired worker cannot be informed of the danger. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a system capable of reliably informing a worker immediately below a suspended load of a danger of falling of the suspended load.

[0006]

Means for Solving the Problems A signal wave is provided on a hook of a load suspending wire and directed downward, and a signal wave is transmitted into a region immediately below a suspended load which is assumed to be dangerous due to a drop of a load suspended by the hook. A signal wave radiator that emits, and an alarm device that is carried by a worker and warns the worker of entry into the area, the signal wave radiators each extending radially in a substantially horizontal direction. Multiple arms and attached to the tip of each arm,
A light emitting diode that emits infrared light as the signal wave,
The alarm device, the signal wave receiving means for receiving the signal wave, and when the signal wave is received, an alarm generating means for giving an alarm sound and alarm vibration to the worker carrying the device, Prepare. (Function) A plurality of arms each extending radially in a substantially horizontal direction, and attached to the tip of each arm,
Since the signal wave emitter is composed of a light emitting diode that emits infrared light as the signal wave, by setting the arm length appropriately, infrared light of sufficient intensity can be transmitted to the region without being interrupted by a suspended load. It becomes possible to project a signal wave.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment In FIG. 2, a structure 30 is under construction and a load 12 is hung on a roof portion thereof. The load 12 is suspended by a wire 32 drawn from the tip of the boom 10, and the boom 10 extends from a crane truck 34.

A signal wave radiator 1 is provided at the tip of the boom 10.
The signal wave radiator 14 is directed downward and emits a signal wave beam 100. In FIG. 3, the signal wave radiator 14 includes four equal-length arms 14a extending in a direction perpendicular to each other in a horizontal plane from the tip of the boom 10, and a head 14h attached to the tips of these arms 14a. Have been.

Light-emitting diodes (not shown) are provided on the lower surface of each head 14h, and the light-emitting diodes 14h are attached to a load 1 suspended from the tip of the boom 10.
The area 1000 immediately below the suspended load, which is assumed to be dangerous due to the drop of 2.
Inward, the signal wave beam 100 of FIG. 2 is emitted as shown in FIG. The length of each arm 14a is set so that the load 12 can be sufficiently accommodated in the signal wave beam 100, and the signal wave beam 100 is set within a range (a belt shape) where the load 12 is assumed to fall on the moving path of the load. Is always projected.

Referring to FIG. 2, a worker 200 on a structure roof is shown.
Wears a helmet 36 on the head. 5, a receiver 40 for the signal wave beam 100 is provided at the top of the helmet 36, an alarm circuit 42 is provided inside the top, and an alarm 44 is provided at the base of the chin strap of the helmet 36 (see FIG. 5). The receiver 40, the alarm circuit 42, and the alarm 44 form the alarm device 18 of FIG. 1).

The alarm 44 includes a buzzer 46 and a vibrator 4.
When the receiver 40 receives the signal wave beam 100, the receiver 40 is driven by the alarm circuit 42 to alert the worker 200 of the danger of falling of the suspended load by sound and vibration. That is,
When the suspended load 12 moves above the worker 200 or when the worker 200 moves below the suspended load 12, the fall of the suspended load 12 is alerted to the worker 200 by sound and vibration. You.

[0012] Even if the noise is loud or the hearing impaired, a warning sound is emitted at the ear and a warning is given even when vibration occurs. Evacuate to a safe outside location. Therefore, it is possible to more completely avoid human damage due to the drop of the suspended load 12.

[0013] The operator of the crane truck 34 also holds the suspended load 12.
, The workability can be improved. In addition, the light emitting diode is easy to set the beam angle, does not diffuse without being restricted by the Radio Law, and
Regardless of the distance between the signal wave radiator 14 and the alarm device (18), the light reaches the region 1000 with a small attenuation and sufficient intensity. -2nd form In FIG. 6, the signal wave radiator 14 is provided in the base part of the hook 50 provided in the front-end | tip of the load hanging wire 32. FIG.

The arm 14 is provided in consideration of the size of the suspended load 12 so that the signal wave beam 100 is not interrupted by the suspended load 12.
Determine the length of a. The length of the arm 14 a may be expanded and contracted from the driver's seat of the crane vehicle 34 according to the size of the suspended load 12.・ Third embodiment When there is no problem in winding the wire, as shown in FIG.
The signal wave radiator 14 is provided at an intermediate portion of the wire 32. -4th form The said alarm device (18) is attached to the vest worn by the worker 200 (it is preferable to attach to a shoulder part). It is also preferable to provide it on a ground vehicle (particularly, a driver's seat). Fifth Embodiment A dangerous area setting device shown in FIG. 8 is prepared. The control unit 60 is provided on the driver's seat side of the crane truck 34, and the drive unit 62 in FIG.

The control unit 60 is provided with operation inputs (operating and inputting instructions by the operator of the crane truck 34) and sensor inputs (joint angle of the boom 10, drawing-out length of the wire 32, wind speed, attitude of the signal wave radiator 14). , The length of the arm 14 a, etc.), and sends a control signal to the drive unit 62. The driving unit 62 controls the signal wave radiator 14 according to the given control signal.
Is changed, and the direction of the infrared light emitting diode is changed, and the arm 14a is expanded and contracted.

As a result, depending on the size, height, moving speed, acceleration and strong cross wind of the suspended load 12, the signal wave beam 100
Is adjusted manually or automatically to the appropriate area 1000
Is projected to Sixth Embodiment The above-mentioned alarm device 18 is the alarm post 70 of FIG. 9, and a number of alarm posts 70 are arranged in rows and columns on the structure roof as shown in FIG. 10 (in a range where the suspended load 12 may move). Are arranged in a matrix at a constant interval over the matrix).

Each alarm post 70 includes a receiver 40 for the signal wave beam 100 provided on the top, an alarm circuit 42 provided inside the post below, and an alarm 44 provided on the head.
The alarm 44 has a buzzer 46 and a rotating light 72
(A strobe light may be used). Then, when the receiver 40 receives the signal wave beam 100, the buzzer 46 and the rotating lamp 72 are driven by the alarm circuit 42 to warn the danger of dropping the suspended load with loud noise and strong light.

Here, the arrangement of a number of alarm posts 70 is not limited to the above-mentioned arrangement in rows and columns, but may be what is called a random arrangement.

[0019]

According to the present invention, the danger of falling of a suspended load is notified to a worker directly under the suspended load by vibration or light, and the warning is automatically performed. Therefore, when the operator's attention is directed to the suspended load. Even if the noise at the work site is loud, and even if the worker is hearing-impaired,
It is possible to reliably avoid human damage due to the drop of the suspended load.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the first invention.

FIG. 2 is an explanatory view of a mounting position of a signal wave radiator.

FIG. 3 is a diagram illustrating the configuration of a signal wave radiator.

FIG. 4 is an explanatory diagram of a signal wave beam.

FIG. 5 is an explanatory diagram of a configuration of a helmet.

FIG. 6 is an explanatory view of a mounting position of a signal wave radiator.

FIG. 7 is an explanatory view of a mounting position of a signal wave radiator.

FIG. 8 is a configuration explanatory view of a dangerous area setting device.

FIG. 9 is an external view of a warning post.

FIG. 10 is an explanatory view of a layout of a warning post.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Boom 12 Hanging load 14 Signal wave radiator 14a Arm 14h Head 30 Structure 32 Wire 34 Crane truck 36 Helmet 40 Infrared signal wave receiver 42 Alarm circuit 44 Alarm 46 Buzzer 48 Vibrator 50 Lifting hook 70 Alarm post 72 Revolving light 100 Signal wave beam 200 Worker 1000 Danger area of falling load

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Asashi Itabashi 2 Tobanjima Construction, Sanbancho, Chiyoda-ku, Tokyo (56) References JP-A-60-132895 (JP, A) JP-A-2- 193092 (JP, A) JP-A 6-65385 (JP, U) JP-A 4-123493 (JP, U) JP-A 63-139284 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B66C 15/00-15/06 B66C 23/88

Claims (1)

(57) [Claims] 1. A signal wave provided on a hook of a load suspending wire, directed downward, and radiating a signal wave into a region immediately below a suspended load which is assumed to be dangerous due to a drop of a load suspended by the hook. A radiator, and an alarm device carried by the worker to warn the worker of entry into the area, the signal wave radiator includes a plurality of arms each extending radially in a substantially horizontal direction. And a light-emitting diode attached to the tip of each arm and emitting infrared light as the signal wave. The alarm device includes: a signal wave receiving unit that receives the signal wave; and when the signal wave is received. And an alarm generating means for giving an alarm sound and an alarm vibration to the worker carrying the device.