JPH0352789Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention attaches a boom to the front of the crane body, runs a undulating rope between the A frame on the crane body and the bridle, and connects the bridle and the boom. The top of the boom is connected to each other via a pendant rope, and the pendant rope is supported via a support member swingably attached to the middle part of the boom.

(b) Prior Art Next, an example of a conventional mobile crane of this type will be explained with reference to FIGS. 4 to 6.

At the front of the crane body 1 equipped with a traveling body,
A jib 2 is attached so that it can be raised and lowered back and forth, and an A-frame 3 that supports a sheave is attached to the top of the jib 2 from the middle part to the rear end. The undulating rope 4 let out from the winch (not shown) installed on the crane body 1 is A.
It is hung around the sheave of frame 3 and the sheave of bridle 5. A support member 6 made of a pipe material that reduces deflection of the boom 2 is attached to the intermediate portion of the boom 2 by a pin 7 so as to be swingable. One end of the first pendant rope 8 that supports the boom 2 is connected to the bridle 5, the other end is connected to the tip of the support member 6, and one end of the second pendant rope 9 is connected to the tip of the support member 6. The other end is connected to the tip of the boom 2. Note that the intermediate portion of one pendant rope may be connected to the tip portion of the support member.

When the undulating rope 4 is wound around the winch, the boom 2 is raised, and when the undulating rope 4 is let out from the winch, the boom 2 is lowered.

(c) Problems to be solved by the invention In the mobile crane equipped with the support member 6 described above, when the boom 2 is grounded, even if the hoisting rope 4 is loosened, the tip of the support member 6 and the pendant rope 8 , 9 are connected, so that the support member 6 stands substantially vertically on the boom 2, as shown in FIG. Therefore, there are the following drawbacks.

(1) When assembling and disassembling the support member 6, it is necessary to attach and detach the pendant ropes 8 and 9 at the tip thereof, which is very inconvenient and time-consuming to handle. Moreover, the pendant ropes 8, 9 are under tension due to their own weight, and manual operation is therefore dangerous.

(2) Since the support member 6 is subjected to compressive force and bending force due to the tension of the pendant ropes 8 and 9, the number of points to be considered in design increases, and its own weight also increases.

This invention has been made in view of the above, and provides a mobile crane that can be easily assembled and disassembled by hand, and can reduce the acting force acting on the support member of the pendant rope to only tension. The purpose is to

(d) Means for solving the problem This invention is aimed at achieving the above purpose. A boom is attached to the front of the crane body, and a levitation rope is installed between the A frame on the crane body and the bridle. In a mobile crane in which the bridle and the top of the boom are connected to each other via a pendant rope, the first support is a first support in which the support members supporting the pendant rope are connected to each other by a pin so that one end can be bent. and a second support member, the other end of the first support member is connected to the middle part of the boom by a pin, the other end of the second support member is connected to a rope connection member by a pin, and the rope It is characterized in that a pendant rope is connected to the connecting member.

(e) Effect When the boom is grounded, even if the undulating rope is loosened, the first support member and the second support member are bent toward each other using the pin as a fulcrum, and lie on the boom together with the pendant rope.

(f) Example Below, an example of this invention is shown in Figures 1 to 3.
This will be explained using figures.

The support member 10 includes a first support member 10a connected to each other by a pin 11 so that one end thereof can be bent.
and a second support member 10b. The other end of the first support member 10a is connected to the boom 2 by a pin 7.
The other end of the second support member 10b is connected to a rope connection member 13 by a pin 12. The end portions of the first pendant rope 8 and the second pendant rope 9 are connected to the rope connecting member 13.

When the boom 2 is raised, the first support member 10a and the second support member 1 are connected as shown in FIG.
0b is a straight line like a single support member. When the undulating rope 4 is loosened when the boom 2 is grounded, the first support member 10a and the second support member 10b bend toward each other about the pin 11, and the support member 10 does not stand on the boom 2, but both It lies on the boom 2 together with the pendant ropes 8 and 9.

By removing the aforementioned pins 7, 11, 12, the first support member 10a and the second support member 1
0b can be decomposed.

(g) Effects of the device According to the device explained above, the following effects can be obtained.

(1) When the jib is grounded and the pendant rope and supporting member are assembled or disassembled, the tension on the pendant rope is eliminated, so the work can be easily done by hand.

(2) The support member itself can be disassembled, making it easier to transport.

(3) By reducing the acting force acting on the support member to tension only, the design becomes easier and the support member can be weighed.

[Brief explanation of the drawing]

1 and 2 are side views showing one embodiment of this invention, FIG. 3 is an enlarged exploded perspective view showing the upper ends of the rope connecting member and second support member in FIG. 1, and FIG. 4 is a conventional 5 is an enlarged side view showing the support member in FIG. 4, and FIG. 6 is a side view showing the mobile crane with the support member for the pendant rope in FIG. It is a side view which shows a state.

Claims (1)

[Scope of utility model registration request] In a mobile crane, a boom is attached to the front part of the crane body, a levitation rope is passed between the A-frame on the crane body and the bridle, and the bridle and the top of the boom are connected to each other via a pendant rope. The support member that supports the rope is composed of a first support member and a second support member that are connected to each other by a pin so that one end can be bent, and the other end of the first support member is connected to the middle part of the boom by the pin. , the other end of the second support member is connected to a rope connecting member by a pin, and a pendant rope is connected to the rope connecting member.