JPS6327276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle-type crane that stores a jib boom on the underside of a main boom.

[Prior art] A jib boom is attached to the tip of the main boom so as to extend out when in use.This boom assists the boom length of the main boom, expanding the range of crane work, and increasing the lifting height of the lifted load. used to enhance For this reason, it is preferable for the jib boom to be as long as possible. Usually, the jib boom is supported and stored along the lower surface of the main boom when not in use.

[Problems to be Solved by the Invention] However, in a vehicle-type crane, the connecting portion between the main boom and the hoisting cylinder that hoists the main boom is located on the tip side of the hoisting cylinder's foot pin when the main boom is tilted to its maximum extent. In the past, when the jib boom was stored on the underside of the main boom when not in use, there was a drawback that the hoisting cylinder would get in the way. For this reason, the length of the jib boom that can be stored on the underside of the main boom is limited to the length from the tip of the main boom to the connection between the luffing cylinder and the main boom, and there is a problem that it cannot be made longer.

This invention was made based on these circumstances, and its purpose is to provide a vehicle in which the length of the jib boom can be secured without being restricted by the position of the connection between the luffing cylinder and the main boom when the jib boom is stored. It's about getting a shape crane.

[Means for Solving the Problems] In the present invention, the jib boom is bendable near the connecting portion between the luffing cylinder and the main boom, and the proximal end of the jib boom from the bent portion is attached to the lower surface of the main boom. The distal side from the bent part is stored along the lower surface of the luffing cylinder, and the proximal jib boom and distal jib boom are stored at the bent part of the proximal jib boom and the distal jib boom. It is characterized by providing means for regulating the maximum bending angle.

[Function] With this configuration, the tip side of the jib boom beyond the bent portion can be stored along the lower surface of the luffing cylinder, so the length of the jib boom can be adjusted by adjusting the length of the jib boom to the connecting portion between the main boom and the luffing cylinder. It can be made longer than that. Even if the jib boom is bent from the middle, the maximum bending angle of the distal jib boom is regulated by the maximum bending angle regulating means provided between the proximal jib boom and the distal jib boom, so the distal jib boom will not hang down. There isn't.

[Embodiment] An embodiment of the present invention will be described below based on FIGS. 1 to 4.

In the figure, 1 is a vehicle body of a vehicle-type crane, for example, a truck crane, and 2... are wheels of the vehicle body 1. The vehicle body 1 is provided with a driver's seat 3 for driving and outriggers 4. Further, a swivel base 5 is provided on the vehicle body 1, and the swivel base 5 is provided with a driver's seat 6 for crane work, and a pivot shaft 7.
A main boom 8 is provided which is pivotally supported.

This main boom 8 is extendable and retractable by a telescopic cylinder (not shown). Further, the swivel base 5 is provided with a single undulating cylinder 9 located on the center line of the main boom 8. The base end of the undulating cylinder 9 is connected to the swivel base 5 via a foot pin 9a, and the tip of its piston rod is connected to the lower surface of the main boom 8 via a bracket 10. The bracket 10 is provided closer to the tip of the main boom 8 than the foot pin 9a when the main boom 8 is tilted to its maximum extent. Therefore, the main boom 8 can be raised and lowered by expanding and contracting the raising and lowering cylinder 9.

A main wire 11 is attached to the tip side of the main boom 8.
A main hook 12 is provided via the main hook 12. This main wire 11 is wound up and let out by a main winding winch (not shown).

Jib boom 1 is attached to the bottom side of the main boom 8 above.
3 is stored and supported. The base end 13a of the jib boom 13 is removably pivoted to a pivot pin 14 provided at the tip 8a of the main boom 8.
The jib boom 13 is composed of a proximal jib 15 and a distal jib 17, and the distal jib 17 can be bent about a rotation shaft 18 as shown in FIG. Jib boom 13 above
The proximal jib 15 is stored and supported along the lower surface of the main boom 8 by mounting brackets 16, 16, and the distal end jib 17 is stored and supported on the lower surface of the undulating cylinder 9. The base of the tip side jib 17 has an arc-shaped insertion hole 1.
9 is formed, and the insertion hole 19 regulates the maximum bending angle of the distal end side jib 17. The distal end portion 15a of the proximal jib 15 has a fastening bolt 2 corresponding to the insertion hole 19 of the distal jib 17.
0 insertion holes (not shown) are formed.
By inserting the fastening bolt 20 into the insertion hole 19 through this insertion hole and fastening it with a nut (not shown), the distal side jib 17 is connected to the proximal side jib 15.
It can be fixed at a predetermined bending angle. Therefore, when storing the jib boom 13, for example, if the fastening bolt 20 is positioned at the A position of the insertion hole 19 and tightened as shown in FIG.
It is designed so that it can be stored on the lower surface side of the undulation cylinder 9 in a state where it is bent at a predetermined angle .alpha. During such storage, the proximal jib 15
The bending angle α with respect to the tip side jib 17 is the same as the minimum luffing angle position of the main boom 8, that is, the angle formed by the main boom 8 and the luffing cylinder 9 when the main boom 8 is tilted to the maximum. . Note that 21 is a mounting bracket for the distal side jib 17 provided as necessary, and this mounting bracket 21 is attached to the distal side jib 17 with a pivot pin 21a.
It is now possible to support When supporting the distal end jib 17 with this mounting bracket 21, the nut of the fastening bolt 20 is loosened so that the bending angle of the distal jib 17 can be freely changed. The side jib 17 is always connected to the hoisting cylinder 9 regardless of the hoisting angle of the main boom 8.
It is designed to be able to be stored along the lower surface of the undulating cylinder 9, being substantially parallel to the undulating cylinder 9.

When using the jib boom 13, by positioning the fastening bolt 20 at position B of the insertion hole 19 and tightening it, these distal side jib 17 and proximal side jib 15 are connected.
and can be fixed in a straight line. At this time, the distal end jib 17 is supported by the distal end portion 15a of the proximal jib 15.

A tension rod 22 is attached to the proximal jib 15.
is provided. The tip 22 of this rod 22
a is configured to be rotatable around a rotation pin 23, and its base 22b is connected to the tip 8 of the main boom 8.
It can be removably engaged with an engagement pin 26 provided at the upper part of a. Note that 25 and 25 are support brackets for the rod 22, and 27 and 27 are sheaves that guide an auxiliary wire 28 (see FIG. 4). This auxiliary wire 28 is wound up and fed out by an auxiliary winch (not shown).

According to the above embodiment with such a configuration,
First, when the jib boom 13 is stored, the jib boom 13 is configured so that it can be bent around the rotation axis 18, so that the jib boom 13 can be folded around the main boom 8.
and can be stored along the lower surface of the undulating cylinder 9. Therefore, the length of the jib boom 13 is not restricted by the position of the pivot bracket 10 that connects the hoisting cylinder 9 and the main boom 8, and can be extended along the lower surface of the hoisting cylinder 9. A sufficient length of the jib boom 13 can be ensured. As a result, the range of crane work can be further expanded, and the lifting height of the suspended load can be further increased.

In addition, since the jib boom 13 can be bent and stored, a sufficient length of the jib boom 13 can be secured, and the pivot bracket 10 of the luffing cylinder 9 can be bent.
can be placed on the tip side of the main boom 8. Therefore, compared to the case where the pivot bracket 10 is located near the base end of the main boom 8 in order to secure the length of the jib boom 13,
The moment acting on this undulation cylinder 9 during crane work can be reduced. As a result, by locating the pivot bracket 10 near the proximal end of the main boom 8, it is possible to replace the conventional two undulation cylinders with one undulation cylinder 9. Further, when two undulation cylinders are used, a mechanism for synchronizing these undulation cylinders is required, but in this embodiment, since the number of undulation cylinders 9 can be reduced to one, the above-mentioned mechanism is not required.

Also, when retracting the jib boom 13, the tip side jib 17
Even if the tip of the insertion hole 19 tries to hang downward, the A position of the insertion hole 19 will hit the tightening bolt 20 and the maximum bending angle α of the tip side jib 17 with respect to the proximal side jib 15 will be reduced.
is regulated, so the tip of the tip side jib 17 is prevented from hanging down.

On the other hand, when the jib boom 13 is stored, the nut of the fastening bolt 20 is loosened to make the tip side jib 17 bendable, and the tip side jib 17 is pivotally supported by the mounting bracket 21. can always be stored along the lower surface of the luffing cylinder 9 regardless of the luffing angle of the main boom 8. For this reason, as shown in Figure 3, the main boom 8
When performing crane work by standing up the main boom 8, the main boom 8 can have a wide base, and the tip side jib 17 will not become an obstacle during the crane work.

Furthermore, since the jib boom 13 is stored on the lower side of the main boom 8 and the luffing cylinder 9, there is an advantage that the jib boom 13 can protect the luffing cylinder 9, various valves, and piping when stored.

Next, when using the jib boom 13, the fourth
As shown in the figure, the jib boom 13 is mounted so as to extend out in front of the main boom 8. That is, by inserting the fastening bolt 20 into the B position of the insertion hole 19 and fastening it with a nut, the distal side jib 17 and the proximal side jib 15 are fixed in a substantially straight line, and the base 22b of the tension rod 22 is connected to the engagement pin. 26
The jib boom 13 is supported by engaging with the jib boom 13. Note that 14a is the base end 13 of the jib boom 13.
This is a fixing pin that fixes a to the pivot pin 14. In this case, even if a hanging load is applied to the distal side jib 17, the load is not only supported by the auxiliary wire 28, but also partially supported by the distal end 15a of the proximal side jib 15, so that the fastening bolt 20 is does not require the strength to withstand large loads because it does not carry large loads. Therefore, there is no need to make the fastening bolt 20 and its fastening part particularly strong, so it is possible to prevent the weight of the jib boom 13 from increasing.
The lifting ability of the jib boom 13 is not reduced.

Note that this invention is not limited to the above embodiment. For example, the insertion hole 19 provided in the tip side jib 17 is not necessarily formed in an arc shape, but may be insertion holes 19a and 19b formed at the A position and the B position, respectively, as shown in FIG. . In this case, the mounting bracket 21 of the distal end side jib 17 is not necessary. In this way, when the jib boom 13 is stored, the insertion hole 19a at the A position can be used to
As shown in FIG. 6, the main boom 7 can be stored on the lower surface side of the luffing cylinder 9 while maintaining the maximum bending angle α regardless of the luffing angle of the main boom 8.

Further, according to this embodiment, the pivot bracket 10 is located relatively near the tip of the main boom 8 as shown in FIG. The main boom 8 may be disposed directly above the foot pin 9a or closer to the tip of the main boom 8 when the main boom 8 is tilted to its maximum position.

[Effects of the Invention] As explained above, according to the present invention, the jib boom can be bent in the middle, and the tip side of the bent portion is stored along the lower surface of the luffing cylinder, so that the length of the jib boom can be reduced. can be extended beyond the connection between the main boom and the luffing cylinder. Therefore, the length of the jib boom is not restricted by the connection position between the hoisting cylinder and the main boom, and a sufficient length can be ensured. Even if the jib boom is bent from the middle, the maximum bending angle of the distal jib boom is regulated by the maximum bending angle regulating means provided between the proximal jib boom and the distal jib boom, so the distal jib boom will not hang down. There is no need to worry about this tip getting in the way.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, with Figure 1 being a side view of a vehicle-type crane, Figure 2 being an enlarged view of the main part of Figure 1, and Figure 3 being an upright state of the main boom. FIG. 4 is an explanatory diagram showing how the jib boom is used. 5 and 6 show other embodiments of the present invention, with FIG. 5 being an enlarged view of the main parts, and FIG. 6 being an explanatory diagram showing the operation of the main boom in its upright state. 1...Vehicle body, 5...Swivel base, 8...Main boom, 9
... Lifting cylinder, 13 ... Jib boom, 15 ... Proximal side jib, 17 ... Tip side jib, 18 ... Rotation axis, 1
9, 19a, 19b...insertion hole, 20...fastening bolt.

Claims (1)

[Scope of Claims] 1. A main boom that is extendable and retractable, a hoisting cylinder that is connected to the lower surface of the main boom and raises and lowers the main boom, and a hoisting cylinder that is connected to the lower surface of the main boom and whose base end is directed toward the distal end of the main boom and whose distal end is directed toward the proximal end of the main boom. A vehicle-type crane equipped with a jib boom that is stored along the lower surface of the main boom while facing to the side, and when in use is rotated about the base end and extended in front of the main boom, the jib boom The jib boom can be bent near the connection between the undulating cylinder and the main boom, and the proximal end of the jib boom is stored along the lower surface of the main boom, and the distal end of the jib boom is folded into the undulating section. The feature is that means is stored along the lower surface of the cylinder and is provided at the bending portion of the proximal jib boom and the distal jib boom for regulating the maximum bending angle of the proximal jib boom and the distal jib boom. Vehicle type crane.