JPH0221519Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention includes a first boom and a second boom,
A folding boom device for a work vehicle, in which the height of a floodlight attached to the tip of a second boom or a bucket for boarding a worker can be arbitrarily adjusted by driving the first and second booms up and down. It is related to.

(Prior Art) A folding boom device for a working vehicle of this type will be explained with reference to FIG.

In FIG. 4, the folding boom device is connected to vehicle 1.
A first boom 4 whose base end is pivotally connected to a base 2 which is mounted so as to be able to swing upwardly so that it can be raised and lowered, and whose base end is driven to be raised and lowered by a raising and lowering drive device 7 that is interposed between the base 2 and the base 2; A second boom 6 is pivotally connected to the distal end of the first boom 4, and one end of the second boom 6 is pivotally connected to the base end of the first boom 4 to the base 2. It is pivotally connected to the base 2 near the rear, and the other end of the second boom 6 is connected to the second boom 6 more than the pivotally connected part of the second boom 6 to the tip of the first boom 4.
and a connecting member 8 pivotally connected to the second boom 6 deviated toward the tip, and when the first boom 4 is in a substantially horizontally laid down state, the second boom 6 is
When the first boom 4 is in a folded state superimposed on the boom 4 and is driven to raise and lower, the first boom 4 has an angular fluctuation that is larger than the angular fluctuation of the first boom 4 with respect to the base 2 caused by the raising and lowering drive. to raise and lower the second boom 6 relative to the first boom 4;
The relative positions of the respective pivot joints are set and configured.

In the conventional folding boom device, in the folded state where the second boom 6 is superimposed on the first boom 4, the connecting member 8 is connected to the second boom 6 and the first boom 4.
Located between the booms 4, the first boom 4, the second boom 6, and the connecting member 8 were stacked in a stacked manner, and their height was large and collapsed.

The object of this invention is to solve the problems of the prior art described above and to provide a folding boom device that has a small height dimension in a superimposed folded state.

(Means for Solving the Problems) In order to achieve the above object, the folding boom device for a work vehicle of this invention connects the connecting member 8 in the conventional folding boom device to the first and second folding boom devices. It is characterized by being configured with a pair of left and right connecting members 8a and 8b that avoid the ups and downs locus of the two booms 4 and 6, thereby reducing the height dimension in the folded state in which the second boom 6 is superimposed on the first boom 4. That is.

(Function) According to the above configuration, the connecting member 8 is connected to the second boom 6
and between the first boom 4 and the second boom 4.
Since the boom 6 and the connecting member 8 are not stacked, the height of the folded state in which the second boom 6 is superimposed on the first boom 4 can be reduced.

(Example) The folding boom device for a work vehicle of this invention will be described below with reference to FIGS. 1 to 3, with reference to an example implemented in a lighting vehicle.

In Figures 1 to 3, A is a lighting vehicle, whose base end is pivotally connected 3 to a base 2 which is rotatably mounted on a vehicle 1, and which is connected between the base 2 and the base 2. A first boom 4 that is driven to be hoisted by an interposed hoisting drive device 7, and a second boom 6 whose base end is pivotally connected 5 to the tip of the first boom 4 so as to be able to rise and fall freely.
It is equipped with 8 connects one end of it to the first boom 4
The base end of the second boom 6 is pivotally connected to the base 2 on the rear side of the pivot connection part 3 to the base 2, and the other end is connected to the tip of the first boom 4 of the second boom 6. It is a connecting member that is pivotally connected 10 on the second boom 6 that is offset toward the tip of the second boom 6 from the pivot connecting portion 5, and the first boom 4 and the second boom 6
A pair of left and right connecting members 8a, 8 that avoids the undulating locus of
It is composed of b. The connecting member 8 is connected to the second boom 4 when the first boom 4 is in a substantially horizontally laid down state.
When the boom 6 is in a folded state superimposed on the first boom 4 and the first boom 4 is hoisted by the hoisting drive device 7, angular fluctuation of the first boom 4 with respect to the base 2 caused by the hoisting drive. The relative positions of the respective pivot joints 3, 5, 9, and 10 are set so that the second boom 6 can be raised and lowered with respect to the first boom 4 with a larger angular variation. Specifically, the distance between the pivot connection part 3 and the pivot connection part 9 is set to be larger than the distance between the pivot connection part 5 and the pivot connection part 10, and the length of the connection member 8 is set to be greater than the distance between the pivot connection part 5 and the pivot connection part 10. The second boom 6 is set to be in a folded state in which it is superimposed on the first boom 4 when the first boom 4 is in a substantially horizontally laid down state. The first boom 4, the second boom 6, and the connecting member 8 constitute a folding boom device B for a working vehicle according to the present invention. 11 is a floodlight attached to the tip of the second boom 6 in the bending boom device B, and its optical axis always remains constant (horizontal in this embodiment) regardless of the up-and-down movement of the second boom 6. It is swingably suspended from the tip of the second boom 6 via a support shaft.

Next, the action will be explained. From the retracted state (shown in FIG. 1) of the folding boom device B in which the first boom 4 is in a substantially horizontally laid down state and the second boom 6 is folded over the first boom 4, the first boom 4
When the is lifted up by the hoisting drive device 7, this hoisting drive acts on the pivot connection part 10 of the second boom 6 via the connection member 8, and makes the second boom 6 more relative to the first boom 4. Elevate the device even at a large elevating angle. As a result, when the first boom 4 is raised to the maximum, the second boom 6 assumes a position that extends greatly upward from the tip of the first boom 4 (as shown in FIG. 3). In other words, in conjunction with the lifting drive of the first boom 4, the second
The boom 6 is raised and raised. At this time, the second
The tip of the boom moves upward along a predetermined trajectory, thereby moving the projector 11 attached thereto upward. When the first boom 4 is driven to fall down, the tip of the second boom 6 and the floodlight 11 attached thereto can be moved downward by the opposite effect to the above.

In addition, since the connecting member 8 is constituted by a pair of left and right connecting members 8a and 8b that avoid the undulating locus of the first boom 4 and the second boom 6, the connecting member 8
is located between the second boom 6 and the first boom 4, and
The boom 4, the second boom 6, and the connecting member 8 are not stacked together, and the second boom 6 is connected to the first boom.
The height dimension of the folded state superimposed on the boom 4 can be reduced.

In addition, in the above embodiment, an example was shown in which the folding boom device B was implemented in a lighting vehicle, but by replacing the floodlight 11 with a bucket for carrying a worker, etc., the folding boom device B of an aerial work vehicle can be used. Of course, it can be implemented as a device.

(Effects) The folding boom device for a work vehicle of the present invention can reduce the height dimension of the folding boom device in a folded state in which the second boom is superimposed on the first boom, and is compared to the conventional one. However, when the folding boom device is mounted on a vehicle, there are fewer restrictions on height and it can be manufactured easily.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of a lighting vehicle implementing the folding boom device for a work vehicle according to the present invention, in which FIG. 1 is a side view of the folding boom device in a retracted state; The figure is a plan view of FIG. 1, and FIG. 3 is a side view of the folding boom device in a raised state.
FIG. 4 is an explanatory diagram of a folding boom of a conventional work vehicle. 1... Vehicle, 2... Base, 4... First boom,
6... Second boom, 7... Lifting drive device, 8...
Connecting member.

Claims (1)

[Scope of utility model registration request] A first motor whose base end is pivotally connected to a base 2 rotatably mounted on the vehicle 1 so that it can be raised and lowered, and which is driven to raise and lower by a raising and lowering drive device 7 interposed between the base 2 and the base 2.
A boom 4, a second boom 6 whose base end is pivotally connected to the tip of the first boom 4, and one end of which is connected to the base 2 at the base end of the first boom 4. It is pivotally connected to the base 2 that is closer to the rear than the pivot joint, and the other end is attached to the second boom 6.
The second boom is connected to the tip of the first boom 4.
A connecting member 8 is pivotally connected to a second boom 6 which is deviated toward the tip of the boom 6, and when the first boom 4 is in a substantially horizontally laid down state, the second boom 6 is placed on top of the first boom 4. When the first boom 4 is in the superimposed folded state and is driven to raise and lower, the second boom 6 is moved with a larger angular fluctuation than the angular fluctuation of the first boom 4 with respect to the base 2 caused by the raising and lowering drive. The folding boom device for a working vehicle is such that the relative positions of the respective pivot joints are set so as to raise and lower with respect to the first boom 4, and the joint member 8 is connected to the first and second booms. A pair of left and right connecting members 8a and 8b that avoid the ups and downs trajectory of the booms 4 and 6
A folding boom device for a working vehicle, characterized in that the height dimension of the second boom 6 in a folded state superimposed on the first boom 4 is reduced.