JPH0211432Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in a device for extending an auxiliary jib from the tip of a telescopic jib in a crane installed in a crane vehicle or the like.

As methods for storing and extending the auxiliary jib, the so-called sliding method shown in FIG. 1 and the so-called horizontal holding method shown in FIG. 2 are used.

In the sliding type shown in FIG. 1, an auxiliary jib 1 is slidably attached to the upper surface of a telescopic jib 2 in the up-and-down direction, and is used to store and extend the jib. However, it has been pointed out that this auxiliary jib 1 has a drawback that the offset angle cannot be adjusted when it is extended.

In the horizontal holding type shown in FIG. 2, an auxiliary jib 1 is swingably attached to the side of a telescopic jib 2, and is used to store and extend the jib. However, this auxiliary jib 1 is heavy, and it is very troublesome and difficult to align the set pin holes when it is extended. It has been pointed out that the disadvantage is that it is difficult to repair when damaged.

In view of these circumstances, the present invention aims to overcome the drawbacks of the above-mentioned slide type by improving it.The present invention is an attempt to overcome the drawbacks of the above-mentioned sliding type. To provide a device for extending an auxiliary jib in a crane, which allows easy and easy extension by extending the jib, eliminates the need for actual alignment, and allows for angle adjustment.

The present invention will be explained below based on an embodiment thereof shown in the drawings from FIG. 3 onwards.

First, the basic configuration that characterizes it will be explained.

This auxiliary jib extending device for a crane is of a type in which an auxiliary jib 1 that can freely slide on an upper surface 3 of a telescoping jib 2 in the up-and-down direction A thereof is extended from a tip 4 of the telescoping jib 2. It also includes the following auxiliary jib 1, mounting member 7, and support member 9.

The tip of the auxiliary jib 1 can be locked to the tip 4 of the telescopic jib 2, and is extended and retracted as the telescopic jib 2 expands and contracts in the locked state.

The mounting member 7 is provided hanging from the base end 5 of the auxiliary jib 1 and is provided with a pin hole 17.
At the same time, the proximal end 5 of the auxiliary jib 1 in an extended state is attached to the upper part 6 of the distal end 4 of the telescopic jib 2 by pivoting through a pin hole 17.

The support member 9 connects the proximal end 5 of the auxiliary jib 1 in an extended state to the lower portion 8 of the distal end 4 of the telescopic jib 2 .

That is, the support member 9 has pin holes 12 and 12 formed at one end 10 and the other end 11, respectively.
12, . . . , and a plurality of pin holes 12, 12 . . . are provided along the longitudinal direction on the one end portion 10 side. The support member 9 has at least one pin hole 12 on the one end 10 side and a pin hole 1 on the other end 11 side with respect to the auxiliary jib 1 in the stored state.
It is attached and fixed by pin connection by 2.

On the other hand, this support member 9 has one pin hole 12 on the one end 10 side and a pin hole 12 on the other end 11 side.
and a pin hole 13 provided on the distal end side of the proximal end 5 of the auxiliary jib 1 in an extended state and a pin 14 provided on the lower portion 8 of the distal end portion 4 of the telescopic jib 2 in a corresponding manner. This is to connect the auxiliary jib 1 and the telescopic jib 2.

Next, details of this extending device will be explained.

On the stand 15 rotatably mounted on the top of the vehicle,
A telescopic jib 2 is attached so that it can be raised and lowered freely. The telescopic jib 2 is of a multi-stage type that can be telescopically extended and retracted, and through rollers 16, 16, .
An auxiliary jib 1 is slidably provided.

A cross-sectional attachment member 7 is suspended from the base end 5 of the auxiliary jib 1, and pin holes 17 are bored in both hanging portions of the attachment member 7. A pin hole 18 is provided on the side surface of the telescopic jib 2 at a position corresponding to the pin hole 17 when the auxiliary jib 1 is stored. Further, a pin hole 19 is provided in the upper portion 6 of the tip portion 4 of the telescopic jib 2 at a position corresponding to the pin hole 17 when the auxiliary jib 1 is extended. Therefore, when extending, the mounting member 7 is pivotally attached to the upper portion 6 by rotatably connecting the pin holes 17 and 19 with pins.

Next, the support member 9 is made of a long plate-like body, and one end 10 thereof has a plurality of pin holes 12, for example two pin holes, arranged along the longitudinal direction as shown in the figure.
For example, one pin hole 12 is bored in each of the other ends 11. It is better to drill a large number of the plurality of pin holes 12 in the one end portion 10, since an appropriate inclination angle of the auxiliary jib 1 can be obtained by selecting the plurality of pin holes 12. This support member 9 supports the auxiliary jib 1
When the is retracted, the above pin hole 1 is inserted into the auxiliary jib 1.
2, 12, . Pin hole 1 on end 11 side
2 are attached and fixed to the auxiliary jib 1 by connecting them with pins, respectively. When the auxiliary jib 1 is extended, the pin holes 12, 12,
. . . One of the middle and the pin hole 13 provided on the distal side of the base end 5 of the auxiliary jib 1 remain connected with a pin, and the pin hole 12 of the other end 11 and the pin hole 13 of the distal end 4 of the telescopic jib 1 are connected with a pin. A pin hole 14 provided in the lower portion 8 is connected with a pin.

21 is a wire, and one end of this wire 21 is attached to a winch provided on the stand 15, and is stretched out and rewound by this winch. The other end of this wire 21 is attached to the tip of the auxiliary jib 1, and functions to support the weight of the auxiliary jib 1 when it is extended.

The extending device according to the present invention is configured as described above.

Next, its operation will be explained.

First, when the auxiliary jib 1 is in the retracted state, the third,
As shown in FIG. 4, the auxiliary jib 1 is attached and fixed to the upper surface of the telescopic jib 2 by connecting pin holes 17 and 18 with fixing pins 22. The support member 9 also has at least one pin hole 12 on its one end 10 side, that is, in the illustrated example, the pin hole 12 on its end side and the pin hole 12 on its other end 11 side.
, the pin hole 13 and the pin hole 20 are connected with pins 23, respectively, thereby being attached and fixed to the side surface of the auxiliary jib 1.

Next, when extending the auxiliary jib 1, first
As shown in the figure, when the fixing pin 22 is removed, the auxiliary jib 1
When the auxiliary jib 1 is locked to the telescopic jib 2 and then the telescopic jib 2 is extended, the auxiliary jib 1 moves while sliding on the rollers 16, 16 as the telescopic jib 2 is extended. Then, the auxiliary jib 1 is extended until the mounting member 7 hanging down from the base end 5 of the auxiliary jib 1 matches the position where the distal end 4 of the telescopic jib 2 is located when the telescopic jib 2 is retracted. move it.

After that, as shown in Fig. 6, the auxiliary jib 1 and the telescopic jib 2 are released from the locked state, the weight of the auxiliary jib 1 is supported by the wire 21, and then the telescopic jib 2 is retracted. 1 maintains the moving position, and only the telescopic jib 2 is retracted. Thus, when the pin holes 17 and 19 are aligned, the pin hole 17 and the pin hole 19 are rotatably connected by the pin 24, so that the mounting member 7 is attached to the tip of the telescopic jib 2. 4 is pivotally connected to the upper part 6 of 4. Thereafter, the pin 23 on the other end 11 side of the support member 9 is removed, and in the illustrated example, the support member 9 is swung counterclockwise in the drawing around the pin 23 on the one end 10 side. As shown in the figure, by connecting the pin holes 12 and 14 on the other end 11 side with pins 25, the other end 11 of the support member 9 and the lower portion 8 of the tip 4 of the telescopic jib 2 are connected. be combined. Since one end 10 of the support member 9 is connected to the distal end side of the proximal end 5 of the auxiliary jib 1, the auxiliary jib 1 and the distal end 4 are connected via the support member 9. The extension of the auxiliary jib 1 is then completed.

Next, when adjusting the offset angle of the auxiliary jib 1 in the extended state, one end 10 of the support member 9 is adjusted.
The side pin 23 is pulled out from a particular pin hole 12, that is, in the example shown, the pin hole 12 on the end side thereof, and in another pin hole 12, that is, in the example shown, that is slightly further away from the end.
Convert it to , connect it with pins, and adjust it as shown in Figure 8.

Further, the operation of returning the auxiliary jib 1 from the extended state to the original retracted state is performed by performing the operation opposite to that described above.

As explained above, the auxiliary jib extension device for a crane according to the present invention is an improvement on the conventional so-called slide type device, and the auxiliary jib is extended from the tip of the telescopic jib via the mounting member and the support member. By doing so, the following effects will be achieved.

First, since the auxiliary jib is extended and retracted by extending and retracting the telescopic jib, the configuration for this purpose is simple and the operation thereof is easy.

Second, the auxiliary jib in the extended state is strongly held by forming a triangle with the tip of the telescopic jib and the support member using the three pins as fulcrums. Moreover, this is achieved by a simple configuration and by easy operations such as insertion and removal of each pin.

Thirdly, a mounting member constituting this overhanging device,
The support members and the like are stored together with the auxiliary jib when it is stored. In this way, since the attachment members, support members, etc. are not left at the tip of the telescopic jib, they do not interfere with the normal operation of the telescopic jib, and there is no danger that they will fall from a high place. Storing and using the mounting member and the support member as described above is realized by simple and easy operations such as inserting and removing each pin and extending and contracting the telescopic jib. Fourthly, unlike the conventional example, there is no need for actual matching, and it has excellent compatibility and repairability, and can be easily applied to various multi-stage telescopic jibs.

Fifth, the extension angle can be easily adjusted by inserting and removing each pin. Further, the shallow angle and deep angle can be selected freely and easily without any particular order, and the operation is easy from this point of view as well.

In this way, the problems that existed in this type of conventional example have been completely eliminated, and the effects it has are remarkable and great.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a crane vehicle equipped with a so-called sliding type telescopic jib, and FIG. 2 is a schematic diagram showing a crane vehicle equipped with a so-called side-holding type telescopic jib. 3 to 8 show an embodiment of an auxiliary jib extension device for a crane according to the present invention. Third
The figure is a side view of a main part showing the stored state of the auxiliary jib, and FIG. 4 is a sectional view taken along the line - in FIG. 3. Figures 5 and 6 show the extension process of the auxiliary jib. Figure 5 shows the extended state of the telescopic jib, Figure 6 shows the retracted state, and Figure 7 shows the extended state of the auxiliary jib. , and FIG. 8 is a side view of the main parts, showing a state in which the angle of the auxiliary jib has been adjusted from that of FIG. 7. Brief explanation of the symbols, 1... Auxiliary jib, 2... Telescopic jib, 3... Top surface, 4... Tip part, 5... Base end part, 6... Upper part, 7... Mounting member, 8... ... lower part, 9 ... support member, 10 ... one end, 11 ...
Other end, 12...pin hole, 13...pin hole, 14
... Pin hole, 15 ... Stand, 16 ... Roller, 1
7... Pin hole, 18... Pin hole, 19... Pin hole, 20... Pin hole, 21... Wire, 22...
...Fixing pin, 23...Pin, 24...Pin, 25
……pin.

Claims (1)

[Claims for Utility Model Registration] A crane in which an auxiliary jib that can freely slide on a telescopic jib extends from the tip of the telescopic jib, the tip of which can be locked to the tip of the telescopic jib; an auxiliary jib that is extended and retracted as the telescopic jib expands and contracts in the retractable state, and a pin hole that hangs down from the base end of the auxiliary jib, and the auxiliary jib in the retracted state is connected to the above by the pin connection through the pin hole. a mounting member that is mounted and fixed on the telescopic jib and that attaches the proximal end of the auxiliary jib in an extended state to the upper part of the distal end of the telescopic jib by pivoting through the pin hole; and a support member connecting the distal end side of the telescopic jib to the lower part of the distal end of the telescopic jib, and the support member has pin holes bored at one end and the other end thereof, respectively. A plurality of holes are provided along the longitudinal direction on one end side, and the auxiliary jib is connected to the auxiliary jib in the retracted state through at least one pin hole on the one end side and a pin hole on the other end side. At the same time, the support member has a pin hole on one end side, a pin hole on the other end side, and a pin hole provided on the distal side from the proximal end of the auxiliary jib in an overhanging state. and a pin hole provided in the lower part of the tip of the telescopic jib, respectively, and connect them with pins to connect the two.