JPH0417658Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is based on a three-stage simultaneous telescopic boom, which is made by sequentially telescopically inserting an intermediate cylinder and an inner cylinder into an outer cylinder, and is mounted on a swivel base on a traveling base. A ladder is provided above the upper surface of the telescopic boom between the inner cylinder tip end and the outer cylinder base end, and expands and contracts in conjunction with the telescopic movement of the telescopic boom. The present invention relates to a telescoping boom equipped with a ladder which is equipped with a winch device and has a hook suspended from the tip of the inner cylinder via a rope fed out from the winch device.

(Prior Art) FIG. 5 is a side view of a conventional digging vehicle equipped with a hook.

In FIG. 5, A is a traveling base, B is a swivel base disposed on the traveling base A, and C is a three-stage simultaneous telescopic boom whose base end is pivotally supported on the swivel base B. The outer cylinder 1, intermediate cylinder 2, and inner cylinder 3 are telescopically inserted in sequence.H is an auger device, and when not in use, it is folded and stored on the side of the telescopic boom C, but when in use, it is placed at the tip of the telescopic boom. It is used for digging work while being suspended from the ground. D is a winch device, and the rope R let out from the winch device D is reversely folded back by an upright pulley 4 located at the tip of the outer cylinder 1 and arranged approximately parallel to the undulation trajectory plane of the telescopic boom C. After that, the hanging tool 5 is pulled into the inner cylinder 2 to the base end, passes through a pulley (not shown) provided at the base end, and then is pulled out from the tip of the inner cylinder 3.
I try to hang it. When the winch device D is disposed on the telescopic boom C in this way and the rope R is arranged as described above, the inside of the hoisting device 5 is This has the effect that the position relative to the tip of the cylinder 3 can remain unchanged.

In this case, in order to prevent interference between the upright pulley 4 and the inner cylinder 2, the upright pulley 4 is configured to protrude upward from the upper surface of the outer cylinder 1.

(Problem to be solved by the invention) However, if the upright pulley 4 protrudes upward in this way, the worker can safely move on the telescopic boom C and carry out tasks such as installing attachments at the tip of the inner cylinder. In order to make this possible, when a ladder E that expands and contracts in conjunction with the telescoping movement of the telescoping boom C is installed above the top surface of the telescoping boom C between the tip of the inner cylinder 3 and the base of the outer cylinder 1. Ladder E and rope R
In order to avoid contact with the telescopic boom C, the mounting position of the ladder E had to be far away from the telescopic boom C, as shown in FIG. Therefore, when working by inserting the tip of the telescopic boom C into a place where the upper space is limited, there is a problem in that the workability is poor.

(Means for Solving the Problem) In order to solve this problem, the present invention, in the telescopic boom equipped with the above-mentioned ladder, removes the rope let out from the winch device at a position below the top surface of the outer cylinder. It is led out along the tube to the tip of the outer tube, and after being reversed by a horizontal pulley placed approximately perpendicular to the undulation trajectory plane of the telescopic boom at the tip of the outer tube, the inside of the outer tube is guided to the base end of the middle tube. It is constructed so that it is drawn into a pulley provided in the section, turned around by the pulley, and then guided out to the tip of the inner cylinder.

(Function) With this structure, the position of the hook 5 with respect to the telescopic boom remains unchanged even if the winch device D is not driven when the telescopic boom is raised and retracted, and the ladder is disposed above the top surface of the telescopic boom. The rope does not become an obstacle when installing the ladder, and the ladder can be brought as close as possible to the top surface of the telescopic boom.

(Example) Next, the present invention will be explained based on a specific example.

In FIG. 1, 11 is an outer cylinder, 12 is an intermediate cylinder,
Reference numeral 13 denotes an inner cylinder, and an intermediate cylinder 12 and an inner cylinder 13 are sequentially telescopically inserted into the outer cylinder 11 to form a telescopic boom S. And the outer cylinder 11 and the intermediate cylinder 12
A double-acting hydraulic cylinder (not shown) is provided between the outer cylinder 11 and the intermediate cylinder 12 to control expansion and contraction of the intermediate cylinder 12. A rope (not shown) is arranged so that the inner cylinder 13 is extended with respect to the intermediate cylinder 12, and the inner cylinder 13 is contracted with respect to the intermediate cylinder 12 as the intermediate cylinder 12 is contracted. It forms a telescopic boom. A winch device D is disposed at the base end of the outer cylinder 11. Reference numeral 14 denotes a pulley disposed at the base end of the outer cylinder 11 so as to be slidable in the left-right direction, and reference numeral 15 denotes a horizontal pulley disposed approximately perpendicular to the undulation locus plane of the telescopic boom S inside the tip end of the outer cylinder 11. 16 is a pulley provided on the upper surface of the intermediate cylinder 12 at the base end of the intermediate cylinder 12, and 17 is an introduction pulley provided at the tip of the inner cylinder 13. The rope R let out from the winch device D passes through the pulley 14 and is led out along the outer cylinder 11 through the space between the upper surface of the outer cylinder 11 and the upper surface of the intermediate cylinder 12 to the tip of the outer cylinder 11, and then is guided to the horizontal pulley 15. It is inverted and turned back at the point, passes through the space again, and reaches the pulley 16.
After being reversed and turned back by this pulley 16, the introduction pulley 1
7, passes through this introduction pulley 17, and suspends the hook below the introduction pulley 17.

In the above embodiment, the winch device D was disposed at the center of the base end of the outer cylinder 11, but as shown in FIGS.
As shown in the figure, a winch device D is disposed outside the proximal end of the outer cylinder 11, and a rope R is connected to the outer cylinder 11.
It is led out along the outer cylinder 11 to the tip of the outer cylinder 11 at the lateral outer position of the cylinder 11, and is reversed by a horizontal pulley 18 arranged approximately perpendicular to the undulation trajectory plane of the telescopic boom S at the tip of the outer cylinder 11. After folding the outer cylinder 1
A pulley 1 whose inner side is provided at the base end of the middle cylinder 12
It is also possible to pull it out to the guide pulley 17 at the tip of the inner cylinder 13 after it is pulled in to the guide pulley 17 at the tip of the inner cylinder 13 after being inverted and folded back at the pulley 19.

(Effects of the invention) In this invention, since there is no rope for lifting the hook above the top of the outer cylinder, the ladder can be moved as close as possible to the top of the telescoping boom. This has the effect of improving work efficiency by inserting the tip of the telescopic boom into places where space is limited.

[Brief explanation of the drawing]

Fig. 1 is a side view of a telescopic boom showing one embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a side view of a telescopic boom showing another embodiment of the invention, and Fig. 4 is a side view of a telescopic boom showing an embodiment of the present invention.
The figure is a plan view thereof, and FIG. 5 is a side view of a conventional digging vehicle. 11... Outer cylinder, 12... Intermediate cylinder, 13... Inner cylinder, S... Telescopic boom, E... Ladder, R... Rope, 5... Hook, 15, 18... Horizontal pulley, 1
6...Pulley, 19...Pulley.

Claims (1)

[Scope of Claim for Utility Model Registration] A three-stage simultaneous telescopic boom, in which an intermediate cylinder and an inner cylinder are sequentially inserted into an outer cylinder in a telescopic manner, is arranged on a swivel base on a traveling base so as to be able to rise and fall freely. A ladder that expands and contracts in conjunction with the telescoping movement of the telescopic boom is provided above the top surface of the telescopic boom between the tip end and the base end of the outer cylinder, and a winch device is provided at the base end of the outer cylinder. In a telescopic boom equipped with a ladder that suspends a hook from the tip of the inner cylinder via a rope that is fed out, the rope that is fed out from the winch device is
It is guided to the tip of the outer tube along the outer tube at a position below the top surface of the outer tube or at a position outward on the side of the outer tube, and is arranged at the tip of the outer tube to be substantially orthogonal to the undulation locus plane of the telescopic boom. After being inverted and folded back by a horizontal pulley, the inner side of the outer tube is pulled into a pulley provided at the base end of the middle tube, and after being inverted and folded back by the pulley, it is led out to the tip of the inner tube. A telescoping boom with a ladder.