JPS60320B2 - Aerial work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for working at high places, which includes a balancing device for a work box provided at the tip of a boom of a crane or the like.

Conventionally, in many work box balancing devices, hydraulic sills are attached to two locations, one on the boom undulating section and the other on the work box and the boom section, and the amount of boom undulation is shifted to the tilt angle of the work box.

However, in this case, if there is oil leakage between the connections between the two cylinders, the equilibrium state may be disturbed, and constant maintenance and inspection is required. Furthermore, damage to the rubber hose connecting the two cylinders was a cause of unexpected accidents. The present invention aims to improve the balancing system using hydraulic cylinders and provide an equipment for working at high places that is equipped with an inexpensive and reliable balancing system using wire ropes, simple pulley devices, etc. In this system, a telescopic boom with a tip boom telescopically mounted inside the base boom is pivoted to the frame so that it can be raised and lowered, and the lower side of an aerial work box is pivoted to the tip of the telescopic boom. A pulley is provided at the front and rear ends of the boom, a bracket having pulleys at both ends is pivotally supported on the pedestal, a wire rope is hung crosswise around the group of pulleys, and the other end of the bracket is pivotally supported at one end on a work box. A high-altitude working device in which the base of the tip boom is fixed to the appropriate position of the wire rope, and each of the supporting points forms a parallelogram, or the tip boom is telescopically retractable within the base boom. A telescopic boom wrapped in a bale is pivotally supported on a stand so that it can be raised and lowered, the lower side of an aerial work box is pivotally supported at the tip of this telescopic boom, and pulleys are provided at the front and rear ends of the base boom, and these pulleys are At the same time, the wire rope is fixed to the proper place and the base of the tip boom, and pulleys are provided at both ends of the bracket, one end of which is pivoted to the frame, and the wire rope is hung around these pulleys. Attach one end of the wire rope to the appropriate place and the end of the placket that is pivoted to the above-mentioned high-altitude work box. The apparatus for working at high places is constructed by connecting a wire rope placed around pulleys provided at both ends of the bracket at suitable positions in the vicinity thereof, and further forming each of the pin fulcrums to form a parallelogram.

Hereinafter, one example embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, reference numeral 1 denotes a stand set upright on a swivel base for an aerial work vehicle (not shown), and reference numeral 2 denotes a telescopic frame 5 which is pivotally supported to the stand 1 by means of a luffing cylinder 3, with a boom at the base end. 5,
It consists of a tip boom 6 that is iron-clad within this base boom 5,
It is expanded and contracted by a telescoping cylinder 7 provided within the frame.

Reference numerals 8 and 9 denote a pulley provided at the front and rear ends of the proximal boom 5, and a work box for working at heights up to 1 river, the lower part of which is pivotally supported 11 to the tip of the telescopic frame 2. 12 is this work box 1
A bracket 14 has one end pivoted at 13 at 0, and 14 is a bracket pivoted at 15 at the pedestal 1 at the upper part of the telescopic boom 2.
Pulleys 16 and 17 are provided at both ends.

Reference numeral 18 denotes a wire rope that is hung crosswise around the above-mentioned pulleys 8, 9 and 16, 17, and is connected to the appropriate position of this wire rope, the other end of the above-mentioned bracket 12, and the tip boom 6.
19 and 20, respectively. Reference numeral 21 denotes a hook for cargo handling work, which is suspended from the tip of the boom by a wire rope 23 let out from a winch 22 provided on the frame 1.

The above-mentioned pivot points 4, 11, 13, and 15 are positioned so that the plane parallel to the boom axis direction formed by connecting these pivot points forms a parallelogram. Also,
It is possible to get on and off the workbench 10 via the aforementioned brackets 12 and 14. Next, Fig. 2 shows an embodiment of another configuration example of the present invention. A wire rope 18b is hung around the wire ropes 8 and 9, and a wire rope 18a is hung around the pulleys 16 and 17.
Proper locations of adjacent portions 8a and 18b are connected 24, and other points are constructed in the same manner as the one shown in FIG. Next, to explain these actions, first, in Fig. 1, "The cylinder 7 is operated and the tip boom 6
When the wire rope 18 is expanded or contracted, the wire rope 18, which is fixed 20 to the base of the boom 6, moves accordingly.

In this case, since the wire rope 18 is hung crosswise, the attachment point 19 that attaches the bracket 12 is pulled in the same direction as the extension and contraction direction of the boom. move at the same speed. Therefore, the pivots 11 and 13 are attached to the tip of the tip boom 6 and the bracket 12.
The work box 10' maintains an equilibrium state regardless of the expansion and contraction of the boom. In addition, as shown in Fig. 2, the pulley 8,
Even when the wire rope 18b is hung around the wire rope 18b and the wire rope 18a is hung around the pulleys 16 and 17, and the adjacent parts of these two ropes are connected 24, the bracket 12 is Since the anchoring point 19 also moves in the same direction and at the same speed, the same effect as described above can be obtained. Next, when the cylinder 3 is actuated to raise and lower the telescopic boom 2, the work box 10 is maintained in a balanced state because the pivot points 4, 11, 13, and 15 form a parallelogram. FIG. 3 shows an example of application of the present invention, in which a telescopic boom 2 equipped with the above-mentioned balancing device is attached to a boom 26 which is pivotally supported 25 on a swivel table so as to be able to rise and fall freely.

That is, a link plate corresponding to the above-mentioned frame 1 is pivotally supported at the tip of the boom 26, and one end of this link plate 27 and a suitable position of the swivel base are each pivotably connected 3 by a link rod 29.
0, 31, and these pivot points 25, 28, 30, 31 form a parallelogram. In other words, as described above, even when the telescopic boom 2 is raised and lowered, the work box 2 maintains a balanced state with respect to the link plate 27, and the link plate 27 also maintains a state of equilibrium with the swivel base even when the boom 26 is raised and lowered. Since the work box 1 is maintained in an equilibrium state, the horizontal state is maintained regardless of the ups and downs of the telescopic boom 2 and the boom 26. Next, the effects of the present invention are listed as follows.

{1} Compared to the hydraulic sill type balancing device, it is cheaper and can perform balancing more reliably.

'2} Bracket 12,1 which is part of the balancing device
4 is configured as a ladder step, so the structure is simple and it is easy to get on and off the work box.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an apparatus for working at high places according to the present invention, FIG. 2 shows another configuration example, and FIG. 3 shows an application example of the present invention. 2... Telescopic boom, 4, 11, 13, 15... Pine fulcrum, 8, 9, 16, 17... Pulley, 10... Work box, 12, 14... Bracket, 18... Wire rope, 19
, 20... anchoring point. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A telescopic boom 2 in which a tip boom 6 is telescopically fitted into a base boom 5 is pivotally supported 4 to a frame 1 so as to be able to rise and fall freely, and an elevated work box is attached to the tip of the telescopic boom. The lower side of the boom 10 is pivoted 11, and pulleys 8 and 9 are provided at the front and rear ends of the proximal boom 5,
A bracket 14 having pulleys 16 and 17 on both ends of the frame 1
A wire rope 18 is hung crosswise around the pulleys 8, 9 and 16, 17, and the other end of the bracket 12, one end of which is pivoted 13 on the work box 10, and the base of the tip boom 6 are attached to this. The wire ropes 18 are fastened to appropriate positions 19 and 20, respectively, and the pivot points 4, 11, 13, and 15 are
A high-altitude working device configured so that the two sides form a parallelogram. 2. The telescopic boom 2, in which the tip boom 6 is telescopically fitted into the base end boom 5, is pivoted 4 to the frame 1 so as to be able to rise and fall freely, and the lower side of the aerial work box 10 is attached to the tip of the telescopic boom 2. A pivot 11 is provided, and pulleys 8 and 9 are provided at the front and rear ends of the proximal boom 5, and a wire rope 18b is routed around these pulleys, and the appropriate position of the wire rope 18b is fastened 20 to the base of the distal boom 6. , pulleys 16 and 17 are provided at both ends of the bracket 14, one end of which is pivoted 15 to the frame 1, and a wire rope 18a is hung around these pulleys, while one end of the wire rope is pivoted 13 to the work box 10. The other end of the bracket 12 is fixed 19, and the adjacent portions of the wire ropes 18a and 18b are connected 24, and the pivot points 4, 11, 13, and 15 form a parallelogram. High-altitude work equipment consisting of: