JPS597692A - Jib receiver for car type crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle-type crane equipped with a jig, such as a truck crane or a truck crane, and particularly to a storage device for a jib.

Vehicle-type cranes such as tiger cranes and cranes are generally equipped with a jib. This jib is extended to the tip side of the boom when in use, and by supplementing the length of the boom, it is possible to expand the working range of the crane and ensure a high lifting height for shipping. On the other hand, when not in use, the boom is normally supported and stored along the lower surface of the boom, so that crane operations using only zooming are not hindered.

By the way, for such a jig, it is desirable to make its length as long as possible in order to increase the work area and lifting height. However, if the jib is made too long, there will be a problem that the tip of the jib will rise above the undulation cylinder that makes up and down the boom when it is retracted. For this reason, the length of the jib is limited to the length from the tip of the boom to the connection position between the tip of the luffing cylinder and the boom, and there is a problem that a longer length cannot be secured.

This invention was made based on these circumstances, and its purpose is to create a "vehicle-type crane" that can store the jig by securing a sufficient length of the jib without interfering with the hoisting cylinder. An object of the present invention is to provide a jib storage device.

That is, this invention has shafts protruding from both sides of the tip of the game, the four forks at the base end of the jig are fitted onto these shafts, and a pull-out stopper is provided in the recessed portions of both forks to prevent the shaft from being pulled out. is provided in the attachment/detachment function, and the jig can be tensioned and retracted by rotating the jib on the above-mentioned shaft turner. The length of the fork is made longer than the other by a predetermined amount, and the outside of the bottom surface of the other fork recess is notched to form a relief part for allowing the protruding end side of the shaft to escape, so that the jib can be attached to the boom when stored. It is characterized in that it is tilted diagonally and the undulating cylinder is stored away.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

Figure 1 shows a truck crane, where 1 is the vehicle body, 2 is a swivel base, 3 is an extendable boom, 4 is a sheet at the tip of this boom 3, 5 is a luffing cylinder, 6 is a driving cab, and 7 is a This is the operator's cabin for crane work.

A jib 8 is stored in the lower surface of the boom 3. This jib 8 has a support 9 attached to the bottom of the third boom.
10 is a sheave at the tip of the jib 8, 12 is a stop for the auxiliary wire 13 for the jib 8 attached to the side of the seam 3, and 14 is the auxiliary wire 130. It is a guide.

The tip end 3a of the boom 3 has shafts 15.15 protruding from both sides thereof, and these shafts J5. The IS is used for tensioning and storing the jib 8. That is, the base end 16 of the jig 8 is connected to the tip end 3 of the boom 3.
a can be loosely fitted into the proximal end portion 1.
6 includes a pair of forks 17m and 17b. These forks 17m and 17b are formed by fork recesses 1Bm and l1lb, respectively, and the shafts 15 and 15 can be removably fitted into these fork recesses 1Bm and 18b.

In addition, on the tip side of both forks 17m and Ilb, there are pin holes 2 for 19 and 19, respectively, as removal stops.
0.20 is formed, and the shaft 16.15 is prevented from being removed by a retaining pin 19.19.

In this embodiment, as shown in FIGS. 2 and 3, the distance t1 between one of the four fork parts 18m and 18b, for example, between the bottle hole 20 in the fork recess 18* and its bottom surface, is the same as the distance t1 between the other fork recess 18b. ! The fork is also long, and the shaft 15 can be movably fitted into one of the fork recesses 18a.

Further, the bottom surface of the other fork concave portion 18b is provided with a relief portion A formed by cutting out the outer portion of the fork recessed portion 18b, so that a relief portion I on the protruding end side of the shaft 15 can be obtained.

21 is a sheep block attached to the tip of the tip 3a of the boom 3, and both fork recesses 1Bm, 1
Of course, the bottom surface of 8b is positioned on the same reference line X.

In addition, when the jib 8 is stored along the lower surface of the boom 3 as shown in FIG. 1, the fork recess 11J of the jib 8
a, 18b and the shafts 15 and 15 on the game 3 side are set to be automatically attached and detached by the expansion and contraction of the boom 3.

According to an embodiment with such a configuration, when the jib 8 is to be extended from the retracted state as shown in FIG. .15 to the fork recess 11Jm of jib 8, 18
b, and these fork recesses 1Bg,
Insert the pin 19.19 into the pin hole 20.20 of 18b. Then, by letting out the auxiliary wire 13, the auxiliary wire 13 is guided and connected to the stopper 12 via the sheet 2 at the tip of the pool 3. Thereafter, after releasing the support of the jib 8 from the supports 9 and 10, the auxiliary wire 13 is reconnected to the tip of the jib 8 and wound up to rotate the jib 8 toward the tip of the boom 3. As shown in Figure 3, the tensioning of the jib 8 is completed. In addition, the third
In the figure, 22 is a tension rod that holds the jib 8, and 23 is a zipper.

On the other hand, when retracting the jib 8 from the extended state, the auxiliary wire 13 is connected to the stopper 1 through the distal end 9 and the sheath 11 of the
2, the tension rod 22 is removed, and while the auxiliary wire 13 is let out, the jib 8 is rotated toward the pool 3 using its own weight, as shown in FIG.

After that, the removal stopper 19 in the one fork recess 18a of the jib 8 is removed, and the auxiliary wire 13 is removed again.
By winding up the jig 8, the jig 8 is brought close to the bottom surface of the pool 3. At this time, the stop pin 1g in the fork recess 1B& is removed, and since the fork recess 18a is longer than the other, the shib 8 is tilted diagonally due to its own weight. , Moreover, since the stopper 12 is attached to the side surface of the seam 3,
This allows the jig f8 to be more reliably tilted and stored on the underside of the pool 3, and then the jib 8 is supported by the supports 9 and 10 to complete the storage of the jig 8.

Therefore, according to the above embodiment, since the jib 8 can be stored tilted, even when the jib 8 is long as shown in FIG.
The tip side of the jig 8 does not come into contact with the undulation cylinder 5, and can be stored while avoiding the undulation cylinder 5. As a result, a sufficient length of the jib 8 can be ensured, and the working performance of the crane can be significantly improved.

Moreover, such an effect depends on the position of the pin 19 in one of the fork recesses 11Jm and the length t! to the bottom thereof!
the other t! Because it can be obtained by making it longer than
Its structure is very simple and is very suitable for implementation.

Also, when tilting the jib 8, the other fork recess 18
Since the relief part A is formed on the bottom surface at point b, as shown in FIG.
The jib 8 can be easily tilted without being restricted by the bottom of the jib 8b, and its workability is excellent.

Furthermore, since the jib 8 is stored diagonally, the tip of the knob 8 can be positioned above the bottom surface of the boom 3, as shown in FIG. 1, and visibility from the operating cab 7 can be improved. It also has advantages.

Furthermore, when the jig 8 is extended, the bottoms of both fork recesses 18* and 11Jb are positioned on the same reference line X, so as the auxiliary wire 13 is wound up, the jig 8 is The shaft is extended so that the axis of the pool 3 coincides with the shaft.

However, the present invention is not limited to the above embodiment. For example, if a guide 23 for guiding the storage of the jib 8 is attached to the bottom surface of the boom 3 as shown in FIGS. 8 and 9,
The jib 8 can be stored diagonally more easily.

Furthermore, the configuration of the removal stopper is not limited to the one using the removal stopper bottle 19, and can be modified in various ways.

The present invention is applicable not only to truck cranes but also to vehicle-type cranes having a dual-purpose driver's cab for both traveling and crane work.

As explained above, in this invention, the jib is stored obliquely along the lower surface of the boom, so even if the jib is long, it will not interfere with the luffing cylinder. Therefore, it is possible to ensure a sufficient length of the jib, and the performance of the crane can be greatly improved, resulting in excellent effects.

[Brief explanation of the drawing]

FIGS. 1 to 7 show one embodiment of the present invention.
The figure is a side view of the truck crane, Figure 2 is a partially sectional plan view of the base end of the jib, Figure 3 is a side view of the base end from the ■ direction in Figure 2, and Figure 4 is the overhang. A side view of the jig showing the state, FIGS. 5 and 6 are diagrams for explaining storage of the jib, FIG. 7 is a bottom view showing a partial cross section of the base end of the jig when stored, and FIGS. 8 and 9. The figures show other embodiments; FIG. 8 is a bottom view of the boom, and FIG. 9 is a diagram illustrating the action of the guide. 3...Boom, 5...Luffing cylinder, 8...Jig, 15 axis, J 6-fork, 18m, 18b...four fork parts, 19...removal stop pin (removal stopper),
A...Escape part. Figure 4 Figure 5 F1 Figure 6 Figure 7 Figure 8 Figure 1

Claims (1)

[Claims] An extendable and retractable game is provided so as to be able to be raised and lowered by a raising and lowering cylinder, and shafts are provided respectively protruding from both sides of the distal end of the boom, and both four forks at the base end of the jib are fitted to these shafts, respectively, and the two fork recesses are respectively fitted to these shafts. A pull-out stopper is detachably provided to prevent the shaft from being pulled out, and by rotating the jib to the shaft turn, the jig can be stretched out from the tip of the boom. In a vehicle-type crane that is retracted along the lower surface, the length between the position of the removal stopper in one of the fork recesses and the bottom of the fork recess is formed to be longer than the other by a predetermined amount; The bottom surface of the fork recess is cut out on the outside of the bottom surface to form a relief portion for allowing the protruding end side of the shaft to escape, and when stored, the knob is tilted diagonally with respect to the boom and stored avoiding the undulation cylinder. A jig storage device for vehicle-type cranes.