JPH06156986A - Crane vehicle - Google Patents

Abstract

PURPOSE:To handle a suspension cargo reliably over a short distance even when a suspension place is located at a level lower than that of an obstacle. CONSTITUTION:A crane vehicle 1 has an expandable boom 3 arranged on a revolving truck 2. The boom 3 comprises cylindrical boom members 3a, 3b, 3c, and 3d, which are fitted in, in order, from the tip side toward a large base side. The boom members 3a, 3b, 3c, and 3d are formed in an arc of circle having the same diameter. Pulleys 4a, 4b, 4c, and 4d are attached to the outside of the tip sides of the respective boom members to prevent a wire 5 from contact therewith. A wire 5 for a suspension cargo is run around the pulleys and the suspension cargo 7 is directly suspended from the pulley 4a at the topmost end through a hook 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crane truck having an improved boom.

[0002]

2. Description of the Related Art In a conventional mobile crane, a tubular boom member which can be fitted in order from a thin tip side to a thick root side forms a straight line, and a boom composed of these boom members also expands and contracts in a straight line. .

[0003]

In an extendable linear boom, if there is an obstacle between a mobile crane fixed by an outrigger or the like and a hoisting place for hoisting or hoisting a suspended load, Long booms Use larger cranes than necessary. If the location is lower than the obstacle and there are eaves, etc., it is impossible to use a large-sized mobile crane, and the suspended load must be disassembled for handling. The same applies when the road width for mobile cranes is narrow.

An object of the present invention is to provide a mobile crane that can reliably handle a suspended load over a short distance even if the suspended location is lower than an obstacle.

[0005]

The crane truck of the present invention is a crane truck having a telescopic boom composed of a tubular boom member that can be fitted in order from the thin tip side to the thick root side. The members form an arc of the same radius. At this time, a pulley may be attached to the outer side of the tip end side of each of the boom members, and a wire for hanging a load may be attached to the pulley.

[0006]

Operation Referring to FIG. Since the boom 3 expands and contracts in an arc shape, it is possible to reliably handle a suspended load at a short distance even if the suspension location is lower than the obstacle.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view of a mobile crane of the embodiment, and FIG. 2 is a front view showing a usage situation of the mobile crane of FIG. In each figure, components having the same reference numeral have approximately the same function, and duplicate explanation may be omitted. In FIG. 1, a mobile crane 1 that can be fixed with an outrigger 1 a includes a swing carriage 2 and a boom 3 that can extend and contract. The boom 3 is composed of tubular boom members 3a, 3b, 3c and 3d, and can be sequentially fitted from the thin tip side to the thick root side.

As a feature of the embodiment, each of the boom members 3a, 3b, 3c and 3d has an arc of the same radius. To prevent the wire 5 from touching,
Pulleys 4a, 4 are provided on the outer sides of the tip ends of the respective boom members.
b, 4c and 4d are attached, and the wire 5 for hanging load is hung on this pulley. The most advanced pulley 4a hangs a suspended load 7 directly via a hook 6. A pulley may be attached to the inside of the root side of each boom member, and a wire for hanging a load may be attached to the pulley.

In FIG. 2, the mobile crane 1 is an obstacle 11
It is fixed to the narrow road W between a and 11b by the outrigger 1a, and the load 12 is placed over the obstacle 11a with respect to the window 12a which is a hanging place having the eaves 12b and the wall 12c of the building 12.
Can be hoisted or hung. In a conventional crane vehicle having a linear boom, if the boom 21 is directly inserted into the window 12a, the obstacle 11a interferes with the handling of the suspended load, and the boom 22 is longer than necessary. Even if the shaped crane truck could be fixed to the road W, the eaves 12b and the wall 12c interfered with the window 12a.
Can not handle suspended loads.

[0010]

According to the crane vehicle of the present invention, since the boom expands and contracts in an arc shape, there is an effect that a suspended load can be reliably handled even when the suspension place is lower than an obstacle.
For this reason, the assembled suspended load is disassembled and transported on site,
The effect is that there is no need to remove the existing equipment on the transport path.

[Brief description of drawings]

FIG. 1 is a side view of a mobile crane according to an embodiment.

FIG. 2 is a front view showing a usage state of the mobile crane of FIG.

[Explanation of symbols]

1 Crane Truck 3 Boom 3a Boom Member 3b Boom Member 3c Boom Member 3d Boom Member 4a Pulley 4b Pulley 6 Hook 7 Suspended Load 11a Obstacle 11b Obstacle 12a Window 12b Eaves 21 Boom 22 Boom

Claims (2)

[Claims] 1. A mobile crane having a telescopic boom composed of a tubular boom member that can be fitted in order from a thin tip side to a thick root side, wherein each of the boom members has an arc of the same radius. Crane truck. 2. The mobile crane according to claim 1, wherein a pulley is attached to the outer side of the tip end side of each of the boom members, and a wire for hanging a load is attached to the pulley.