JPH09124297A - Obstacle detection device for high lift work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reasonably prevent the occurrence of accidents when an obstacle comes close to an elevating work platform from the outside arbitrarily by providing each flexible slender detection hanging stick crosswise around the circumference of the elevating work platform at appropriate intervals, and thereby stretching a rope in such a way that the circumferential neighborhood of the work platform is enclosed. SOLUTION: Each flexible slender detection hanging stick 7 is extended crosswise out of the lower surface of an elevating work platform 5 at its fours corners. A flexible slender bar-like protruding support pole 8 is extended out of the lower surface of the elevating work platform 5 from the downward neighborhood of a hand rail frame 6 at a specified place (a). Each ring shaped part is formed at the tip ends of the detection protruding sticks 7 and the protruding support pole 8, a rope 9 is locked in those ring shaped parts, and it is stretched in an appropriate state of tension. By this constitution, any obstacle coming close to the elevating work platform from all directions can thereby be detected, and the work platform can thereby be prevented from being damaged by the collision of an obstacle. Furthermore, even if the rope is accidentally broken by erroneous operations, it can easily be repaired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obstacle detection device for an aerial work vehicle, which detects an obstacle approaching the vicinity of a lifting work platform.

[0002]

2. Description of the Related Art An aerial work vehicle that allows an operator to board an elevating work table to perform work in a high place has already been widely used in civil engineering work and construction work. When working with a car, there is a risk that a worker will be caught between the lifting workbench and an obstacle, the lifting workbench may collide with an obstacle and damage the structure, or the lifting workbench itself may Accidents that may cause damage may occur.

Under these circumstances, as a conventional example for ensuring the safety of workers, for example, Japanese Patent Laid-Open No. 62-15 is known.
There is one as shown in Japanese Patent No. 3098. However, this one prevents an accident in which a worker is caught between the lifting worktable and the obstacle under an extremely limited condition that the obstacle approaches obliquely from above.

[0004]

DISCLOSURE OF THE INVENTION The present invention detects obstacles such as a structure when an obstacle is approached from outside in any direction outside the elevating work platform during work by an aerial work vehicle, and detects obstacles. (EN) An obstacle detection device for an aerial work vehicle capable of reasonably preventing an accident such as a worker being caught between objects, a structure being damaged, or a lifting worktable being damaged. The purpose is to

[0005]

In order to achieve the above object, in the present invention, elongated elongated flexible detecting rods are provided laterally at appropriate intervals around the lifting worktable. The rope is stretched so as to surround the vicinity of the periphery of the elevating work platform by interposing the detection overhanging rod.

Specifically, for example, the following is performed. That is,
A detection switch is provided on the lower surface of the elevating workbench, and the detection bar is extended obliquely downward from the vicinity of the detection switch. Then, the engaging portion is formed in the middle of the length of the detection overhanging rod, and the actuating input element of the detection switch is positioned in the state where an appropriate gap exists between the engaging portion and the engaging portion. Here, the actuation input element is configured such that the detection switch is turned on and off by interlocking with the engaging portion by the bending deformation of the detection overhanging rod over a certain angle.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an aerial work vehicle according to the present invention, where A is an overall side view, B is a schematic view of an elevating work platform of the work vehicle seen from above, and FIG. 2 is an elevating work platform. It is a side view which shows some.

In the figure, reference numeral 1 is a traveling vehicle, which comprises drive wheels 2 and steering wheels 3. A scissor link mechanism 4, which is vertically movable, is fixed on the traveling carriage 1.
A rectangular lifting work table 5 is fixed to the upper part thereof.

Reference numeral 6 is a handrail frame fixed around the elevating workbench 5, and a specific portion a in the longitudinal direction thereof can be opened and closed so that an operator can easily get on the board. Reference numeral s is a control stand provided with steering operation tools such as a joystick and a lifting lever.

In using the aerial work vehicle, the scissor link mechanism 4 is shortened as shown in the area A1 in FIG. Also load necessary materials. Then, the driving wheel 2 and the steering wheel 3 are operated by operating the joystick of the control stand s, and the traveling carriage 1 is moved to a necessary place. On the other hand, if necessary, the elevating lever is operated to operate the scissor link mechanism 4 to move the elevating work table 5 to an appropriate height.

Thus, the lifting work table 5 is held at an arbitrary position, and in this state, the worker carries out necessary work. Even during the work, the lifting work table 5 is appropriately moved as necessary.

Therefore, the obstacle detecting device which is the main part of the present invention is as follows. That is, the reference numeral 7 designates a slender elongated detecting rod that extends laterally from the lower surfaces of the four corners around the elevating work table 5. In this case, the detecting overhanging rod 7 has its posture inclined downward toward the outside as shown in FIG.
Is fixed to the frame 5a, and a coil-shaped engaging portion 7a is formed in the middle of its length.

On the lower surface of the lifting / lowering workbench 5, an elongated support rod 8 made of a slender and flexible rod member extends from below the specific portion a of the handrail frame 6.

The above-mentioned detecting overhanging rod 7 and overhanging supporting rod 8
An annular portion is formed at the tip of the rope, and the rope 9 is fixed to the annular portion and stretched so as to be in an appropriate tension state. This rope 9 is preferably arranged so as to surround the vicinity of the entire circumference of the elevating workbench 5, but in the illustrated example, it is not arranged in the range of the specific portion a so as to be convenient for an operator to board.

Reference numeral 10 denotes a detection switch fixed on the lower surface of the lifting / lowering workbench 5 in the vicinity of the detection overhanging rod 7, and when the actuating input element 10a is tilted and displaced in a given direction over a certain angle, the switch body is moved. The contacts inside are turned on and off. Here, the actuating input element 10a is located at the center of the coil-shaped engaging portion 7a, and when the detection overhanging rod 7 is bent by a certain angle or more, the actuating input element 10a is tilted and displaced in conjunction with the engaging portion 7a. Has been made.

The operation of the obstacle detecting device will be described. When the traveling carriage 1 travels or the scissor link mechanism 4 operates, the elevating work platform 5 moves horizontally or vertically,
When an obstacle approaches the area around it, this obstacle
Or, contact the overhanging rod 7 for detection or overhanging support rod 8,
These will be pressed.

As a result, the tension balance state of the rope 9 is changed, and when any one of the detection extension rods 7 is tilted in an arbitrary direction by a certain angle or more, the detection switch 10 is turned on or off to cause an obstacle. The approach of an object is detected.

Thus, when the detection switch 10 operates,
The movement of the traveling vehicle 1 and the expansion / contraction operation of the scissor link mechanism 4 are stopped, and the movement of the lifting / lowering work table 5 is instantaneously stopped.

In order to move the lifting / lowering work table 5 in this stopped state, the switch provided for releasing the ON / OFF state of the detection switch 10 is operated to be released.

In the above embodiment, the extension support rod 8 may be the same as the detection extension rod 7 and the detection switch 10 that is interlocked therewith may be provided in the same manner as described above. In addition, when the weight of the rope 9 is large, it is sufficient to deal with it by increasing the number of the detection sticks 7.

[0021]

According to the present invention configured as described above, an obstacle approaching from almost all directions around the elevating workbench can be detected, and an operator is caught between the elevating workbench and the obstacle. , The lifting work platform collides with the structure and damages it,
Alternatively, it is possible to prevent an accident in which the lifting worktable itself collides with an obstacle and is damaged.

Further, since the obstacle is detected by contacting the rope or the detection overhanging rod with the obstacle, the obstacle is irrespective of the moving direction (horizontal direction or vertical direction) of the lifting / lowering workbench. The approach can be detected and the obstacle (construction) is softly contacted without damaging it.

Furthermore, even if the rope is cut due to an operation error, it can be easily and inexpensively repaired, and the detectable distance can be changed simply by changing the length of the detection overhanging rod. Moreover, by making the detection overhanging rod thick, it is possible to avoid detecting obstacles such as tree branches that do not affect the work.

According to the second aspect of the present invention, the actuation input element of the detection switch is operated by engaging with the engaging portion of the detection overhang rod, so that it acts on the detection overhang rod. The excessive external force does not directly act on the detection switch, which prevents damage to the detection switch.In addition, even if there is some mounting error on the detection switch, it will not be affected easily and the detection is unnecessary. With a slight movement, the detection operation is not performed, and the malfunction is avoided.

Further, since the detecting overhanging rod is directed obliquely downward, the influence of the axial compression load on the detecting overhanging rod is reduced even if the obstacle collides with the vertical surface of the obstacle from the horizontal direction, and the seating rod is seated. It is possible to prevent the bending of the detection overhanging rod and the like by bending it downward without causing a bending behavior.

[Brief description of the drawings]

FIG. 1 shows an aerial work vehicle according to the present invention, in which A is an overall side view, and B is a schematic view of an elevating work platform of the work vehicle as seen from above.

FIG. 2 is a side view showing a part of a lifting work table.

[Explanation of symbols]

 5 Lifting work table 7 Overhanging rod for detection 7a Engagement portion 9 Rope 10 Detection switch 10a Operation input element

Claims (2)

[Claims] 1. An elongate work bench is provided with laterally extending elongated detection rods which can be bent at appropriate intervals around the work platform, and these detection rods are interposed to allow the vicinity of the periphery of the work platform to be lifted. An obstacle detection device for an aerial work vehicle, wherein a rope is stretched so as to surround the vehicle. 2. A detection switch is provided on the lower surface of the elevating workbench, a detection bar is extended obliquely downward from the vicinity of the detection switch, and the detection bar is engaged in the middle of its length. The operation input element of the detection switch is positioned in a state in which there is an appropriate gap between the engagement portion and the engagement portion, and the operation input element is formed by bending deformation of the detection overhanging rod over a certain angle. The obstacle detection device for an aerial work vehicle according to claim 1, wherein the detection switch is turned on and off in conjunction with the engagement portion.