JPH0625514Y2 - Bucket safety device for aerial work vehicles - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an aerial work vehicle in which, for example, the operation lever of a safety device provided so as to project outside the boom side portion of the bucket at the tip of the boom has an improved operation direction. The present invention relates to a safety device for the bucket part in the above.

[Prior art]

The safety device for a conventional aerial work vehicle shown in FIGS. 2 (a) and 2 (b),
For example (the one disclosed in Japanese Patent Laid-Open No. 62-153098, when an operator on the bucket 10 detects some danger, the traveling of the aerial work vehicle 11 is stopped urgently, and Although it is provided to avoid the situation immediately, the safety device 12 equipped on the aerial work vehicle 11 concerned.
The operating lever 12a of is, as shown in FIG.
Safety device 12 protruding from the outer periphery of one side of the bucket 10
Further, the operation portion (this operation portion is composed of a long bar to the left and right to make the touch portion wider) 12b is provided inside the bucket 10 so as to face the operation portion 12b. The safety device 12 is pushed by pushing the spring 13 in the direction of arrow A, that is, substantially horizontally against the spring 13 inserted in the safety device 12.
Is operated to stop the traveling of the aerial work vehicle 11 in an emergency.

[Problems to be solved by the device]

Therefore, the operating lever 12a of the safety device 12 having the above configuration
When the operator riding in the bucket 10 is pushed by some obstacle and falls down from diagonally above, there is a possibility that the operator is caught between the obstacle and the operation lever 12a. In particular, the sliding width of the operating lever 12a having the above structure is very small because the spring 13 is interposed in the lever rod. Therefore, when the aerial work vehicle 11 is traveling (normal traveling speed is about 3 to 4 km / h), there is a slight time lag until the aerial work vehicle 11 is completely stopped. Therefore, with the sliding width of the operation lever 12a as described above, the operator is placed in a dangerous situation such that the operator is surely caught between the obstacle and the operation lever 12a before the work platform 11 is completely stopped. There was a problem.

[Means for Solving the Problems]

The present invention has been made in view of the above circumstances, in which the base end is pivotally supported on a turntable that is turnably mounted on the vehicle body.
Equipped with a boom that can be expanded and contracted for a predetermined length and that can be undulated at a predetermined angle, and equipped with a bucket equipped with a safety device at the tip of the boom that is equipped with a safety device for urgently stopping the operation of the aerial work vehicle. In the vehicle, the operating lever of the safety device that faces the inside of the bucket is higher on the safety device side than the safety device that is provided on the boom side of the bucket, and lowers the free end side that faces the bucket. The free end side is circularly rotated downward with the safety device side as a fulcrum.

[Action]

By configuring the safety device for the bucket part in the aerial work vehicle as described above, when an operator who is boarding the bucket and performing a predetermined work is pushed by an obstacle or the like and falls down to the operation lever side. In this case, the operation lever is pivoted downward so that a sufficient gap is created between the bucket fence and the obstacle, and a predetermined work is performed in the bucket by the obstacle and the operation lever. It is to ensure the safety of work in high places by preventing operators from getting caught.

〔Example〕

An embodiment of a safety device for a bucket portion in an aerial work vehicle according to the present invention will be described in detail below with reference to FIGS. 1 (a) and 1 (b).

In the figure, 1 is an aerial work vehicle, 2 is a turntable, 3
Is a boom that pivotally attaches the base end to the turntable and is undulated by an undulation cylinder 4 and is extended and retracted by a built-in telescopic cylinder (not shown in the figure) for a predetermined length. . A safety device 6 is provided so as to project outside the fence of the bucket 5 on the boom 3 side (this safety device constitutes an upper controller unit for performing operations such as ups and downs of the boom 3, turning, and turning and rocking of the bucket 5). In addition, it constitutes a controller portion for carrying out an emergency stop or the like of traveling of the aerial work vehicle 1), and an operating lever 7 having a rotating base end is provided on a side portion of the safety device 6.

As shown in FIG. 2B, the operation lever 7 is located at a high position on the rotation base end side of the safety device 6, and is located at a low position on the free end 7a side facing the inside of the bucket. The safety device 6 is set so as to be inclined, and its rotation is configured such that the base end side of the safety device 6 serves as a fulcrum and the free end 7a side makes an arc rotation in the direction of arrow B shown in FIG.

The operation of the safety device for the bucket portion in the aerial work vehicle according to the present invention will be described based on the above embodiment.

For example, an obstacle such as a beam member X approaches the operator M who is performing a predetermined work at a height while operating the aerial work vehicle 1 in the direction of the arrow C and comes into contact with the operator M in the direction of the arrow D. In this case, the operator M is pushed by the beam member X from the rear and is brought into a state of being tilted. In such an emergency situation, it is the actual situation that the operator M usually concentrates on the operation immediately before the emergency operation. Therefore, in such an emergency situation, for example, the traveling of the aerial work vehicle 1 should be stopped urgently. Although it is extremely demanding to instantaneously operate the operating lever 7 of the safety device 6 located in front of itself, the operating lever 7 of the safety device 6 of the bucket portion of the present invention is shown in FIG. As shown in the figure, the safety base 6 is configured such that the rotation base end side is positioned high and the free end 7a side facing the inside of the bucket is positioned low, so that the free end 7a can be accurately grasped instantaneously at a predetermined time. Since the operator M falls to the free end 7a side even if the dynamic operation cannot be performed, the free end 7a is pushed down by the abdomen of the operator M just as if manually operated. It will be. Therefore, the safety device 6 is properly operated even in such an emergency situation, and the traveling of the aerial work vehicle 1 is surely stopped.

In particular, the operating lever 7 of the safety device 6 for the bucket of the present invention
Since the rotation of the vehicle is configured to rotate in an arc, there is a slight time lag until the vehicle completely stops traveling even when the work vehicle 1 at high altitude is traveling at about 3 to 4 km per hour. Even if there is, the operation lever 7 surely rotates downward in an arc, so that there is no possibility that the operation lever 7 interferes with the conventional operation lever and the operator M is caught between the obstacle and the obstacle. Therefore, the safety of the operator M is sufficiently secured.

[Effect of device]

As described above in detail, according to the present invention, a turntable mounted on a vehicle body is pivotally supported at its base end, and is equipped with a boom which can extend and retract by a predetermined length and which can rise and fall by a predetermined angle. In an aerial work vehicle provided with a bucket equipped with a safety device for urgently stopping the operation such as traveling of the aerial work vehicle, within the bucket from the safety device provided on the boom side of the bucket. Since the operating lever of the safety device facing the safety device side is high and the free end side facing the inside of the bucket is low, the free end side is configured to pivot downward with the safety device side as a fulcrum.
When an operator who is on a bucket and performs a predetermined work is pushed by an obstacle or the like and falls down to the operation lever side, even if the operation lever is instantaneously grasped accurately and the predetermined braking operation is impossible. Since the operating lever can be accurately rotated downward by the abdomen of the operator, the traveling of the work vehicle at high places can be surely stopped. In particular,
Since the operation lever is configured to rotate sufficiently downward, even after the traveling is stopped by the inertia of the work vehicle after the traveling, the space between the bucket fence and the obstacle is increased. Sufficient clearance is created. Therefore, an operator or the like is never caught between the obstacle and the operation lever, and it is possible to perform a safe work at a high place.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing an embodiment of an aerial work vehicle equipped with a safety device for a basket portion of an aerial work vehicle according to the present invention, and FIG. 1 (b) is a perspective view of the same. Part perspective view, FIG. 2
(a), (b) is a perspective view showing an embodiment of an aerial work vehicle equipped with a safety device for a basket portion in a conventional aerial work vehicle,
FIG. 2B is a side view of the main part of the same safety device. 1 ... aerial work vehicle, 2 ... turntable, 3 ... boom, 4 ... hoisting cylinder, 5 ... bucket, 6 ... safety device, 7 ... operating lever, 7a ... free end.

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. A turntable mounted on a vehicle body so as to be pivotable, the base end of which is pivotally supported, and which is equipped with a boom that is extendable and retractable for a predetermined length and can be undulated by a predetermined angle. In an aerial work vehicle provided with a bucket equipped with a safety device for urgently stopping the operation of traveling, etc., of a safety device that faces the inside of the bucket from the safety device provided on the boom side of the bucket. The operation lever is high on the safety device side and low on the free end side facing the inside of the bucket, and the free end side is circularly rotated downward with the safety device side as a fulcrum. Safety device for the bucket part of a car.