JPH0380714B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a truck mounted crane.

A conventional truck-mounted crane, as shown in FIGS. 1 and 2, has a driver's seat 10 of a truck 101.
A swing strut 105 is rotatably mounted on a frame 104 between the driver's seat 102 and a loading platform 103 on the rear side of the vehicle, and a boom 106 is pivotally connected to the distal end of the swing strut 105 so that its base end can be adjusted in elevation. We are prepared. A winch 10 is attached to the swing support 105.
A hook block 109 is suspended from the tip of the boom 106 so as to be able to be hoisted up and down via a wire rope 108 extending from the winch 107 past the tip of the boom 106. During crane work, the swing column 105 is rotated, the boom 106 is raised and lowered, and the hook block 109 is hoisted up and lowered to move the load suspended on the hook block 109 from the loading platform 103 to the ground or from the ground to the loading platform 103. 101
The cargo is unloaded from the truck 101 or loaded onto the truck 101. By the way, this type of truck-mounted crane is Truck 101.
When traveling, the boom 106 is laid down almost horizontally and turned to the rear of the truck 101 to be in the rear retracted state (the state shown in FIGS. 1 and 2). In this case, the boom 106 is Since the boom 106 is located directly above the loading platform 103 of the truck 1, the swing support 105 is installed to prevent the boom 106 from interfering with the cargo.
The height of the vehicle was made as high as possible within the allowable range of the Vehicle Restriction Ordinance to secure loading space for cargo.

However, increasing the height of the swing strut 5 not only raises the center of gravity of the truck 101 and impairs running stability, but also increases the vehicle height of the truck even when the truck is running unladen. There was a problem in that the driver had to constantly pay attention to the height of the vehicle while moving.

The present invention has been made in view of the above-mentioned problems, and is a novel method that can lower the center of gravity and vehicle height of a truck during traveling, and can secure a sufficient cargo loading space of the truck. The purpose of this project is to provide a truck-mounted crane.

Embodiments of the present invention will be described in detail below with reference to FIG. 3 and subsequent figures.

In the figure, 1 is a truck, and this truck 1 is equipped with a driver's seat 2 at the front of a frame 4 and a cargo platform 3 at the rear. A is a truck-mounted crane according to the present invention, and this truck-mounted crane A is mounted on the rear side of the driver's seat 2 of the truck 1, that is, the driver's seat 2, like the conventional truck-mounted crane.
A swing column 5 is rotatably mounted on a frame 4 between the platform and the loading platform 3, and a boom 6 is provided, the base end of which is pivotally connected to the upper end of the swing column 5 so as to be adjustable in elevation. In particular, the truck-mounted crane A according to the present invention comprises a swing column 5 consisting of a lower portion 7 connected to the frame 4 in a freely rotating manner, and an upper portion 8 having a boom 6 pivotally connected to the tip thereof so as to be adjustable in elevation. There is. The base end of the upper portion 8 is pivotally connected to the lower portion 7 via a horizontal support shaft 9 parallel to the undulation trajectory plane of the boom 6.
It is designed to be able to rotate between the upright position and the collapsed position. Reference numeral 10 denotes a hydraulic cylinder for rotating the upper part 7 of the swing column 5 about the horizontal support shaft 9, and is interposed between the lower part 7 and the upper part 8 at a suitable position, and is extended. This brings the upper part 8 into the upright position, and by contracting it brings the upper part 8 into the laid down position. When the upper part 8 is rotated to the upright position by the hydraulic cylinder 10 (the state shown by the solid line in FIGS. 3 to 5), the boom 6, which is pivotally connected to the upper part 8 so as to be able to rise and fall, is vertically connected. It is designed to move up and down along the up and down locus plane.

Also, the boom 6 is in the upright position of the upper portion 8.
Rotate the pivot strut 5 so that its tip faces toward the rear of the truck 1.
When the upper part 8 is rotated by the hydraulic cylinder 10 to the laid down position from the pivoted state, the upper part 8
is laid down in the vehicle width direction of the truck 1 about the horizontal support shaft 9, and its tip is located near the vehicle side of the truck 1. Therefore, when the boom 6 is horizontally laid down with the upper portion 6 in the upright state, when the upper portion 8 of the swing column 5 is brought into the laid down state, the boom 6 is brought to a position along the vehicle side of the truck 1. (Illustrated by dash-dotted lines in FIGS. 3 to 5).

Reference numeral 11 denotes a hydraulic cylinder for raising and lowering the boom 6 with respect to the upper part 8, and is disposed between the upper part 8 and the boom 6 at appropriate positions. 12 is a winch provided in the upper part 8; 13
is a wire rope for suspending the hook block 14 from the tip of the boom 6, and the end of the wire rope is wound around the winch 12 so that it can be freely unwound. Reference numeral 15 is a torii gate provided at the front end of the loading platform 3 to prevent the cargo loaded on the loading platform 3 from interfering with the swing support 5 of the vehicle-mounted crane. And, this torii 15 is
It has a notch 16 on the vehicle side of the track 1 where the tip of the upper part 8 is located when the upper part 8 of the swing strut 5 is in the laid down state. The boom 6 is configured to extend rearward through this notch 16. 17 is a boom support provided in the notch 16 of the torii 15, which supports the side surface of the base end of the boom 6 when the upper part 8 of the swing column 5 is laid down about the horizontal support shaft 9. It is. 18
is a boom support provided on one side of the loading platform 3 to support the tip of the boom 6 when the upper portion 8 of the swing strut 5 is laid down about the horizontal support shaft 9.

Next, to explain the operation, during crane work, the hydraulic cylinder 10 is extended and the swing column 5 is
After the upper part 8 is brought to the upright position around the horizontal support shaft 9, the swing column 5 is swung in the same way as in conventional truck-mounted cranes, the boom 6 is raised and lowered, and the hook block 14 is hoisted and lowered to perform crane work. It is something to do. When traveling on track 1,
After turning the swing column 5 so that the tip of the boom 6 faces toward the rear of the truck 1 and laying down the boom 6 almost horizontally, the hydraulic cylinder 10 is contracted and the upper part 8 of the swing column 5 is rotated. is brought to the lying position around the horizontal support shaft 9. At this time, the upper part 8
Since the tip of the boom 6 is located close to the vehicle width of the truck 1, the boom 6, which is pivotally connected to the tip of the upper part 8 so as to be freely foldable, passes through the notch 16 of the torii 15 and extends rearward toward the vehicle side. brought into position along the line.
For this reason, when the truck 1 is moving, the height of the swing column 5 is lower than the upper part 8 when the truck 1 is moving, compared to when working with the crane.
The height of the truck-mounted crane can be lowered accordingly, and the boom 6 can be stored along the side of the vehicle, so it is possible to avoid the boom 6 from interfering with the cargo as much as possible. I can,
This makes it possible to carry more cargo.

In the above embodiment, in order to ensure as long as possible the length of the upper portion 8, which is disposed so that the tip thereof is located near the vehicle side in the collapsed state, the base portion 7 of the swing strut 5 is , is pivotably mounted at a position closer to the opposite vehicle side of the truck 1 (right side in FIG. 5). Such a configuration is
Since the length of the upper portion 8 can be made long, there is an advantage that the lifting height of the suspended load and the working margin can be increased during crane work.

Furthermore, it goes without saying that the boom 6 in the above embodiment may be a telescoping boom or a folding boom.

Further, in the embodiment described above, the hydraulic cylinder 10 disposed between the upper part 8 and the lower part 7 of the swing column 5 allows the upper part 8 to rotate between the upright position and the collapsed position, and Although the portion 8 is fixed in the upright position, in the case of a small and lightweight truck-mounted crane, it is of course possible to remove the undulating cylinder 10 and rotate the upper portion 8 using input. It is. In this case, suitable fixing means may be provided in place of the hydraulic cylinder 10 to fix the upper portion in the upright position.

As can be seen from the embodiments described above, the truck-mounted crane according to the present invention includes a swing strut rotatably mounted behind the driver's seat of a truck having a loading platform behind the driver's seat, and a tip end of the swing strut. A truck-mounted crane comprising a boom whose base end is pivotally connected to the part so as to be adjustable in elevation,
The swivel column has a base portion connected to the truck in a freely swiveling manner, and a distal end portion of which the boom is pivotally connected to the base portion so as to be freely adjustable in elevation, and the base end thereof has a horizontal support shaft substantially parallel to the undulation locus plane of the boom. The upper part 8 is pivotally connected to the base part through the base part and is rotatable about the horizontal support shaft 9 between an upright position and a collapsed position. The upper part of the swing column is erected around the horizontal support shaft during crane work, and the upper part of the swing support is fixed together with the boom in the horizontal support shaft when the truck is traveling. The construction is such that it can be laid down in the width direction of the vehicle around the shaft, and the tip of the upper part of the swing column is positioned close to the vehicle side of the truck in this laid down state. During work, the upper part of the swing column can be fixed upright to allow cargo handling operations in the same way as previous truck-mounted cranes.When the truck is moving, the upper part of the swing column can be lowered to lower the height of the truck-mounted crane. At the same time, since the boom can be placed along the side of the vehicle, the center of gravity of the truck and the height of the vehicle can be lowered during travel.
Moreover, it has the excellent effect of increasing the loading space of the truck bed.

[Brief explanation of drawings]

1 and 2 are explanatory diagrams of a conventional truck-mounted crane, with FIG. 1 being a side view and FIG. 2 being a plan view thereof. 3 to 5 are explanatory diagrams of a truck-mounted crane according to the present invention, in which FIG. 3 is a side view, FIG. 4 is a plan view, and FIG. 5 is a rear view. Truck...1, Swivel support...5, Foundation part...
...7. Upper part...8. Horizontal support shaft...9.

Claims (1)

[Claims] 1 Truck 1 having a loading platform 9 behind the driver's seat 2
A truck-mounted crane comprising a swing column 5 rotatably mounted on the rear side of the driver's seat 2, and a boom 6 whose base end is pivotally connected to the tip of the swing column 5 so as to be adjustable in elevation. The swing strut 5 is pivotally connected to the base portion 7 which is connected to the truck 1 in a freely swingable manner, and the boom 6 is pivotally connected to the distal end of the boom 6 so as to be adjustable in elevation, and the base end thereof is substantially parallel to the elevation trajectory plane of the boom 6. The upper part 8 is pivotally connected to the base part 7 via a parallel horizontal support shaft 9 and is rotatable about the horizontal support shaft 9 between an upright position and a collapsed position, and the base part 7 and A fixing means for fixing the upper part 8 in an upright position is installed between the upper parts 8, so that the upper part 8 of the swing column 5 can be erected around the horizontal support shaft 9 during crane work, and when the truck 1 is traveling. The upper portion 8 of the swing strut 5 is constructed so that it can be laid down in the vehicle width direction together with the boom 6 about the horizontal support shaft 9, and in this laid down state, the tip of the upper portion 8 of the swing strut 5 is attached to the truck 1. A truck-mounted crane characterized by being configured to be located close to the width of the vehicle.