JPH0344784Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a crane boom storage device in which a second boom is rotatably connected to a first boom that can be raised and lowered.

BACKGROUND TECHNOLOGY A crane has a boom connected to a work equipment frame so as to be able to swing up and down, and a crane has a first boom erected on the work equipment frame and a second boom connected to the first boom so as to be able to move up and down.

Problems to be Solved by the Invention In the former type of crane, the boom, which is placed in a retracted position, protrudes significantly in the front and rear directions and becomes a nuisance when traveling.

In the case of the latter type of crane, since the first boom is installed upright, when the boom is retracted, the overall height increases by the height of the first boom, which becomes an obstacle when traveling.

Means and action for solving the problem: The first boom is attached to the work equipment frame so that it can rotate freely between the upright position and the collapsed position, and the second boom is horizontally attached to the telescopic end of the first boom using a pivot pin. A fixing pin is provided to connect the second boom to the vertical attitude so as to be movable up and down, and to fix the second boom in the horizontal attitude, and the fixing pin is fitted into a bracket provided on the first boom and a bracket provided on the second boom. A boom storage device for a crane that allows the second boom to be fixed in a vertical position.

As a result, the first boom can be stored in the work equipment frame in a laid-down position and the second boom in a horizontal position, and the first and second booms can be firmly connected.
Moreover, there is no need to lose the fixing pin.

Embodiment Fig. 1 is an overall front view of a crane truck, and Fig. 2 is a plan view with the crane omitted. Crane 4 is attached to 3.

The crane 4 is equipped with a first boom 5 and a second boom 6, and the first boom 5 is a multi-stage telescopic boom in which a plurality of booms are sequentially fitted to a fixed boom 7 having a hollow rectangular cross section so as to be slidable with respect to each other. , the second boom 6 is a multi-stage boom in which a plurality of booms are slidably fitted one after another into a fixed boom 8 having a hollow rectangular cross section using cylinders (not shown). 1. Second bracket 19,
20 is fixed to this first bracket 19 and a bracket 21 fixed to the telescopic end of the first boom 5.
The pivot pin 22 is fitted between the second bracket 20 and the bracket 21, and the fixing pin 23 is removably fitted between the second bracket 20 and the bracket 21. By removing the fixing pin 23, the pivot pin 22 can be removed. As a shaft, the second boom 6 is configured to rotate vertically with respect to the first boom 5 between a horizontal position and a vertical position.

Outrigger devices 28 are attached to each of the four corners of the vehicle body 1, and a pair of wheels 35 are attached to the rear of the vehicle body 1 so as to be swingable up and down by wheel arms 36.

The working machine frame 3 has front and rear brackets 41, 42 and an intermediate bracket 43 fixed to both sides of a plate-shaped base plate 40, and each of the front and rear brackets 41, 42 has a cylinder 44 and a long rear link 4.
One end of 5 is pivotally connected with pins 46 and 47, respectively,
One end of a short front link 48 is pivotally connected to each intermediate bracket 43 by a pin 49, and the first
First and second support shafts 50 and 51 are attached to the front wall of the fixed boom 7 of the boom 5, and the other end of the rear link 45 is pivotally connected to both ends of the first support shaft 50.
A front link 48 and a piston rod 44a of the cylinder 44 are pivotally connected to both ends of the support shaft 51, respectively.

As a result, the first boom 5 is connected to the work equipment frame 3.
By expanding and contracting the piston rod 44a of the cylinder 44, the first boom 5 is mounted and supported so as to swing in the vertical direction between an upright vertical position shown by a solid line and a laid down horizontal position shown by a phantom line. At the same time, by removing the fixing pin 23, the second boom 6 can swing to a horizontal position parallel to the first boom 5 as shown by the imaginary line. At the same time, it is placed on the support stand 52 and fixed by a fixing mechanism 60 attached between the fixing booms 7 and 8.

The fixing mechanism 60 includes a pair of brackets 61, 61 fixed to the fixed boom 7 and a bracket 62 fixed to the fixed boom 8.
is inserted between the pair of brackets 61, 61,
The fixing pin 23 is fitted between the pin holes 63 and 64 of both, and thereby the second boom 6 is firmly connected to the first boom 5 during storage and the second boom 6 is connected during transportation. can be made so that there is no slight movement.

In addition, since the fixed pin 23 that connects the second boom 6 and the first boom 5 is also used, the fixed pin 23
3 will not be stored in another place or lost, and the fixing pin 23 and the second boom 6 will not interfere when returning from the storage position to the working position. In other words, if the fixing pin 23 is separate, the fixing pin 23 can be inserted into the first boom 5 and the second boom
The boom 6 may be rotated, and if this happens, the second boom 6 and the fixing pin 23 will interfere with each other.

The first boom 5 and the work equipment frame 3 are removably connected by a connecting device 53, and this connecting device 5
3 includes a pedestal 54 fixed to the base plate 40, a presser lever 55 provided on the pedestal 54 so as to be swingable back and forth, a connecting pin 56 fixed to the lower end of the fixed boom 7 of the first boom 5, and a presser lever 55. A locking mechanism 57 that swings and locks the connecting pin 56 on the pedestal 54.
The first boom 5 and the work equipment frame 3 are connected by pressing and holding them with a presser lever 55,
By separating the presser lever 55 from the connecting pin 56, the first boom 5 and the working machine frame 3 can be separated.

Effects of the invention The first boom 5 is set in a lying position, the second boom 6 is set in a horizontal position, and the first and second booms 5, 6
Since the boom can be stored in the work equipment frame 3, the boom does not protrude forward or upward and will not get in the way when traveling, and when stored, the first and second booms 5 and 6 are firmly connected with the fixing pin 23. Because I can,
The second boom 6 is attached to the pivot pin 2 relative to the first boom 5.
It does not swing up and down around 2.

In addition, since the fixing pin 23 that connects the second boom 6 to the first boom 5 in horizontal and vertical positions is also used, there is no need for a place to store the fixing pin 23, and the fixing pin 23 can be lost. Furthermore, the second boom 6 does not interfere with the fixing pin 23 when returning from the vertical position to the horizontal position.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with Figure 1 being an overall front view, Figure 2 being a plan view with the crane omitted, and Figure 3 being a plan view with the crane omitted.
The figure is a sectional view of the fixing mechanism. 3 is a working machine frame, 5 is a first boom, 6 is a second boom, 22 is a pivot pin, and 60 is a fixing mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] The fixed side of a telescopic first boom 5 is attached to the work machine frame 3 so as to be movable up and down in both the upright position and the collapsed position, and the first boom 5 and the work machine frame 3 A cylinder 44 for vertical movement is connected to the first boom 5, and a bracket 21 is connected to the telescopic end of the first boom 5.
This bracket 21 and the first bracket 19 provided on the second boom 6 are connected by a pivot pin 22, so that the second boom 6 can freely move up and down between a horizontal position and a vertical position. The second boom 6 is fixed in a horizontal position with a fixing pin 23 fitted between a second bracket 20 provided on the boom 6 and the bracket 21 to form a crane, and pins are attached to the first boom 5 and the second boom 6. hole 63
A bracket 61 having a diameter and a bracket 62 having a pin hole 64 are provided at positions equidistant from the pivot pin 22, and the fixing pin 23 can be fitted into each of the pin holes 63 and 64. Crane boom retraction device.