JPS6122949Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention relates to a boom of a truck crane or the like.

Technical Background of the Invention For example, a truck crane is equipped with a telescoping boom on its body so that it can be raised and lowered, and the crane operation is normally performed using the telescoping boom. However, some crane booms of this type are equipped with a jib boom in addition to the telescopic boom, that is, the main boom. When this jib boom is not in use, it is stored and supported along the side of the main boom, and when in use, the base end is directly connected to the tip of the main boom with a pin, and by rotating around this pin, It can be extended in front of the main boom. Therefore, by using a jib boom, it is possible to supplement the boom length of the main boom, and to ensure a large working radius of the crane and a large lifting height of the lifted object.

Problems with the Background Art By the way, in the boom of a crane equipped with the above-mentioned jib boom, when extending the jib boom, it is common to first connect the base end of the jib boom and the tip of the main boom with a directly detachable pin. It is. For this reason, pin holes for the above-mentioned pins are provided at both the base end of the jib boom and the tip of the main boom, and when connecting these, align the pin holes on both sides before fitting the above-mentioned pins. It was hot.

However, both the jib boom and the main boom are subject to deformations such as twisting and warping due to the loads applied by the objects being lifted during crane operation, making it difficult to align the pin holes and making it difficult to easily attach the jib boom to the main boom. There was a problem where it was not possible to connect and extend the parts. On the other hand, when the jib boom is stored after being disconnected from the main boom, it becomes difficult to pull out the pin, making it difficult not only to extend the jib boom but also to store the jib boom.

Purpose of the invention This invention was made based on the above-mentioned circumstances, and its purpose is to provide a crane boom that allows the jib boom to be easily extended and retracted.

Summary of the invention This invention is rotatably supported and protruded from the tip of the main boom, and when rotated, the tip runs along the side of the main boom and faces the base end of the jib boom in the retracted state. The present invention is characterized in that a tapered connecting body is provided, and the proximal end of the jib boom is formed into a socket portion that can be connected by fitting and guiding the connecting body.

Embodiment of the Study Section An embodiment of this invention will be described below based on the drawings.

Figure 1 shows a truck crane, 1 is the car body,
2 is an outrigger, 3 is a driver's cab for traveling, 4 is a swivel table, and 5 is a driver's cab for crane work. Swivel base 4
A telescoping main boom 7 is pivotally supported via a pivot 6 so that it can be raised and lowered, and this main boom 7 is raised and lowered by a raising and lowering cylinder 8. Also, 9 is a hook. This hook 9 is suspended via a wire 10, and this wire 10 is paid out and wound up by a winch mechanism (not shown) on the swivel table 4. Note that A is a suspended object.

A jib boom 11 is attached to the main boom 7. This jib boom 11 is stored and supported along the side of the main boom 7 when not in use, and when in this stored state, the base end of the jib boom 11 is positioned on the tip side of the main boom 7. Further, 12 is a jib boom attached to the tip of the jib boom 11, and 13... is a jib boom 1
1 support bracket.

A connecting body 14 is provided protruding from the tip of the main boom 7. As shown in FIG.
5b, and one pin 15
By removing a, it is possible to rotate around the other pin 15b. Further, when rotated in this manner, the connecting body 14 follows the side surface of the main boom 7 as shown by the imaginary line, and its tip can face the base end of the jib boom 11. The connecting body 14 is formed into a tapered shape, and both side surfaces 16, 16 and the upper and lower surfaces thereof are tapered. Protrusions 1 from the side surfaces 16, 16, respectively
7 and 17 are protruded so that they can be protruded. These protrusions 17, 17 are connected via a link 18 and protrude in conjunction with each other. In addition, 19 is the protrusion 17, 17
20 is a stopper block attached to the tip of the main boom 7. This stopper block 20 comes into contact with the link 18 to restrict the retraction of the projections 17, 17, and
17 is held in the protruding state. In addition, the connected body 1
A sheave 21 is attached to the tip side of 4.
Using this sheave 21, crane work using a single cable can be performed from the tip of the main boom 7.

The base end portion of the jib boom 11 is configured as a socket portion 22. This socket part 22
has a tapered inner surface into which the connecting body 14 can be fitted while guiding, and the inner surfaces 23, 23 have engaging holes 24, 24 into which the protrusions 17, 17 of the connecting body 14 can be fitted. each formed.

Next, the operation of one embodiment with the above configuration will be explained.

First, when extending the jib boom 11 from the retracted state, the main boom 7 is extended by a predetermined length, and then the third
As shown in the figure, one pin 15a of the connecting body 14
is removed and the connecting body 14 is rotated so that it is aligned with the side surface of the main boom 7 on the side where the jib boom is stored. Then, as shown in FIG. 4, the main boom 7 is retracted and the connecting body 14 is inserted into the socket portion 22 of the jib boom 11. At this time, the protrusions 17, 17 of the connecting body 14 touch the inner surfaces 23, 2 of the socket portion 22.
3 and is retracted against the spring 19. Then, when the connecting body 14 is fitted by a predetermined amount, the protrusions 17, 17 are inserted into the spring 19.
The engagement hole 24 of the socket portion 22 is opened by the urging force of
24, and these connecting bodies 14 and the socket portion 22, that is, the jib boom 11 are connected.

After this, attach the jib boom 11 to the support bracket 13.
. . ., and as shown in FIG.
At the same time, the main boom 7 is rotated toward the front.
Then, as shown in FIG. 6, the removed pin 15a of the connecting body 14 is reattached to completely connect the connecting body 14 to the tip of the main boom 7, thereby completing the extension of the jib boom 11.

In addition, when retracting the jib boom 11 from the extended state, the above operation is performed in reverse, and when the jib boom 11 is attached to the side of the main boom 7 via the support brackets 13, as shown in , the projections 17, 17 of the connecting body 14 may be pressed from the outside to retract, and then the main boom 7 may be extended to pull out the connecting body 14 from the socket portion 22.

Therefore, according to the above embodiment, the main boom 7
A tapered connecting body 14 is provided at the tip of the
Since the base end of the jib boom 11 is configured as a socket portion 22 into which the connecting body 14 can be fitted and guided,
Even if both the main boom 7 and the jib boom 11 are deformed, such as twisting or warping, the connecting body 14 is fitted into the socket portion 22 and guided by simply contracting the main boom 7. Also, at this time, the protrusions 17, 17 urged by the spring 19 are automatically fitted into the engagement holes 24, 24 to connect the connecting body 14 and the socket portion 22, that is, the main boom 7 and the jib boom 11. It can be done. Then,
Compared to the conventional method of aligning the pin holes in both the main boom 7 and the jib boom 11 and directly connecting them with pins, these methods do not require the difficult alignment of the pin holes. The main boom 7 and the jib boom 11 can be easily connected, and the jib boom 11 can be extended quickly.

In addition, when performing crane work using the jib boom 11, the load of the lifted object A is
4 will be received as a whole, so this connected body 14
Since the load is not applied to the protrusions 17, 17, deformation such as bending does not occur in these protrusions 17, 17. Therefore, when storing the jib boom 11, the protrusions 17, 17 of the connecting body 14 can be easily retracted from the outside, and the connection between the connecting body 14 and the socket part 22 can be easily retracted by simply extending the main boom 7. Since the connection can be released, the jib boom 11
can be easily stored.

Further, according to this embodiment, the jib boom 11
2, the link 18 comes into contact with the stopper block 20 and the projections 17, 17 are extended.
Since the retraction of the jib boom 11 is prevented, the connection between the jib boom 11 and the connecting body 14 is not disconnected when the jib boom 11 is extended, thereby preventing the jib boom 11 from falling off.

Further, according to this embodiment, since the connecting body 14 is provided with the sheave 21, the jib boom 1
When the main boom 1 is not in use, the sheave 21 can be used to carry out crane work using a single wire from the tip of the main boom 7, thereby improving the efficiency of crane work. Further, since the sheave 21 is attached to the connecting body 14, the sheave 21 does not get in the way when the jib boom 11 is extended.

Note that this invention is not limited to the above embodiment. For example, in this embodiment, the connector 1
4 and the socket part 22 are automatically connected by the protrusions 17, 17 urged by the spring 19, but after fitting the connecting body 14 to the socket part 22, these are connected with a pin or the like. They may also be connected.

Further, the upper and lower surfaces and both side surfaces of the connecting body do not need to be tapered, but it is sufficient that at least one side surface is tapered.

In addition, this idea is not limited to truck cranes.
Needless to say, the present invention can also be applied to crawler cranes having a jib boom on the main boom or cranes for ships.

Effects of the invention As explained above, this invention is rotatably supported and protruded from the tip of the main boom, and when rotated, it faces the base end of the jib boom along the side of the main boom. The present invention is characterized in that a tapered connecting body is provided, and the proximal end of the jib boom is formed into a socket portion that can be connected by fitting and guiding the connecting body. Therefore, even if the jib boom and main boom have some deformation such as twisting or warping, the main boom and jib boom can be easily connected by contracting the main boom and fitting the connecting body into the socket. Moreover, since the main boom can be extended and these connections can be easily released, the jib boom can be easily and quickly extended and retracted, which has great effects.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with Fig. 1 being a side view of the truck crane, Fig. 2 being a partially sectional top view of the main boom end side, and Figs.
The figure is a top view of the main boom showing the procedure for extending the jib boom. DESCRIPTION OF SYMBOLS 1...Car body, 7...Main boom, 11...Jib boom, 14...Connection body, 21...Sheave, 22...
...Socket part.

Claims (1)

[Claims for Utility Model Registration] (1) A crane boom consisting of a telescoping main boom and a jib boom that is stored along the side of the main boom when not in use, which is rotatable at the tip of the main boom. a tapered connecting body whose tip extends along the side of the main boom when it is pivoted and protrudes and can face the proximal end of the jib boom in the retracted state when the main boom is rotated; and a socket part that can be connected by guiding the connecting body to fit therein, and when the jib boom is extended from the stored state and used, the connecting body and the socket part are connected, and the jib boom is connected to the connecting body. A boom for a crane, characterized in that the jib boom is extended by rotating the tip of the main boom forward. (2) The crane boom as set forth in claim (1) of the utility model registration, characterized in that the connecting body is provided with a sheave.