JP2002370894A - Vehicle mounting type crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform crane work in a stable attitude by horizontally installing rear wheels still in a grounding state even on a slope. SOLUTION: This vehicle mounting type crane 1 is provided with a crane mounting base 6 tiltably installed in a vehicle 10, and a tilting cylinder 9 for adjusting an inclination α to the vehicle 10 of the crane mounting base 6. The tilting cylinder 9 has a mechanism of supporting no load more than that by becoming freely extensible and contractible by releasing pressure in the cylinder when applying the load of a prescribed value or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle-mounted crane capable of adjusting its angle so that it can be installed horizontally with the rear wheel of the vehicle grounded even on a slope, and performing work in a stable posture. is there.

[0002]

2. Description of the Related Art Conventionally, a vehicle-mounted crane is mounted on a chassis frame between a driver's cab and a cargo bed, that is, at a position close to a front wheel, and a base of the crane is fixed on the chassis frame. I have. When a vehicle-mounted crane is used on an inclined ground, the outrigger is usually stopped in a state where the vehicle 40 is stopped laterally (in the direction of a contour line) with respect to the inclination direction as shown in FIG. The right and left outrigger cylinders 4344 are extended to extend the crane 41 so that the base 45 is horizontal.
Is installed.

[0003] Then, the chassis frame 46 also becomes horizontal with the base 45 of the crane 41, so that both the front wheel and the rear wheel 47 below the slope (hereinafter referred to as the valley side) are separated from the ground. In addition, on a slope where the slope is not so large, the rear wheel 47 on the valley side may remain grounded with the chassis frame 46 twisted even if the front wheel on the valley side is separated from the ground.

[0004]

When the front wheel and the rear wheel 47 on the valley side are both separated from the ground on a slope, the left and right outrigger cylinders 43 and 44 and the front wheel on the upper side (hereinafter referred to as a mountain side) of the slope (illustrated). ) And only the rear wheel 48 is in contact with the ground, so that the work of the crane 41 on the valley side is less stable than the work on a horizontal ground, and
The performance of No. 1 decreases.

[0005] Even when the rear wheel 47 on the valley side is inclined to the extent that the rear wheel 47 does not separate from the ground, in the state where the chassis frame 46 is twisted, a force for returning the twist acts, so that the valley side has In the operation of the crane 41, the performance of the crane 41 is lower than that in the operation on a horizontal ground. Moreover, when the chassis frame 46 is twisted,
Since a load is applied to the vehicle 40 itself, the durability of the vehicle 40 decreases.

The present invention solves the above-mentioned problem in a vehicle-mounted crane. The crane can be installed horizontally on a sloping ground with the rear wheels still in contact with the ground.
It is an object of the present invention to provide a vehicle-mounted crane that eliminates twisting of a chassis frame and allows a crane to be operated in a stable posture.

[0007]

According to the present invention, there is provided a vehicle-mounted crane comprising: a crane mounting base which is tiltably mounted on a vehicle; and a tilting means for adjusting a tilt angle of the crane mounting base with respect to the vehicle. The above problem has been solved. When this vehicle-mounted crane is used on an incline, the base is leveled by adjusting the angle of inclination of the crane mounting base with respect to the vehicle by tilting means, and in this state, the outrigger is extended to the left and right, and the outrigger cylinder is extended. Extend and set the crane horizontally.

Accordingly, even on a slope, the rear wheels on the mountain side and the valley side of the vehicle are both kept in contact with the ground, so that stable work can be performed with the same performance as that on a horizontal ground. In addition, the chassis frame is hardly twisted, and the load on the vehicle is reduced. When the tilting means has a mechanism that releases the holding of the tilt angle when a load equal to or more than a predetermined value is applied and allows the crane mounting base to freely tilt, damage to the tilting means itself can be prevented and the crane can be mounted on the vehicle. , The torsion of the chassis frame due to a large load during operation can be suppressed.

[0009]

FIG. 1 is a plan view of a vehicle-mounted crane according to an embodiment of the present invention, FIG. 2 is a side view of the vehicle-mounted crane, and FIG. 3 is a rear view of the vehicle-mounted crane. FIG. In this vehicle-mounted crane 1, a base 3 having an outrigger 2 is mounted and fixed on a crane mounting table 6. A rotatable column 4 is provided on the base 3, and a telescopic boom 5 is pivotally supported at the upper end of the column 4 so as to be able to move up and down.

On the chassis frame 13 between the operator's cab 11 and the loading platform 12 of the vehicle 10, a crane mounting platform support bracket 7 is fixed, and the crane mounting platform 6 is attached to the crane mounting platform 6 in the front-rear direction. Are pivotally supported by the support shaft 8 of the first embodiment. A tilting cylinder 9 is mounted between the crane mounting base support bracket 7 and the crane mounting base 6 as tilting means for adjusting the tilt angle α of the crane mounting base 6 with respect to the vehicle 10.

The tilt cylinder 9 is a hydraulic cylinder having a mechanism capable of releasing pressure in the cylinder and freely expanding and contracting when a load equal to or more than a predetermined value is applied, and not supporting any further load. This can prevent damage due to overload. The outrigger 2 includes horizontal arms 21 and 22 that can expand and contract in the left-right width direction of the vehicle 10 and horizontal arms 21 and 2.
Outrigger cylinders 23 and 24 which are fixed to the end of the outer cylinder 2 and which can expand and contract in the vertical direction are provided. Ground members 25 and 26 are attached to the lower ends of the outrigger cylinders 23 and 24.

When the vehicle-mounted crane 1 is used on a slope, the vehicle 10 is stopped laterally with respect to the direction of inclination, and then the tilting cylinder 9 is first extended and retracted to tilt the crane mounting table 6 with respect to the vehicle 10. The base 3 is made horizontal by adjusting the angle α. Next, while keeping this state, the horizontal arms 21 and 22 of the outrigger 2 are extended right and left,
Then, the outrigger cylinders 23, 24 are extended to ground the ground members 25, 26.

At this time, the rear wheels 14 and 15 on the valley side and the mountain side of the vehicle 10 are both in a state of contact with the ground as shown in FIG. Therefore, even on a slope, the rear wheels 14, 15 and the grounding member 2
The four points 5 and 26 maintain the ground contact state, and the crane 1 can perform a stable operation with the same performance as a horizontal ground. Further, when a load equal to or more than a predetermined value is applied to the tilt cylinder 9 during the operation, the pressure in the tilt cylinder 9 can be released to freely expand and contract, so that damage to the tilt cylinder 9 itself can be prevented, and the tilt angle can be prevented. Since the holding of α is released and the crane mounting base 6 can freely tilt with respect to the vehicle 10, the reaction force of the rear wheels 14, 15 from the ground is maintained substantially uniformly, and a large load is applied during the work. The torsion of the chassis frame 13 due to the difference between the reaction forces of the rear wheels 14 and 15 when received is also suppressed.

When the operation is completed, the outrigger cylinder 2
After retracting the horizontal arms 21 and 22 to retract the outriggers 2, the tilting cylinder 9 is extended and retracted to return the crane mount 6 to a state parallel to the vehicle 10 (α = 0). The case where the vehicle-mounted crane 1 is used on an inclined land has been described above.
Similar actions and effects can be obtained even when the vehicle 10 is not level due to a step at the positions 4 and 15.

Further, even when the crane 1 is used on a level ground, a large load is applied to the crane 1 at the time of work, and when a load equal to or more than a predetermined value is applied to the tilt cylinder 9, the tilt angle α (in this case, α
= 0) is released, and the crane mount 6 can freely tilt with respect to the vehicle 10.
The reaction force from the ground of No. 5 is kept almost evenly. As a result, the rear wheels 14, 15 when receiving a large load during work
Of the chassis frame 13 due to the difference in the reaction force of the chassis frame 13 is suppressed.

[0016]

As described above, the vehicle-mounted crane of the present invention can be installed horizontally with the rear wheels still in contact with the ground even on an inclined ground. Therefore, it is possible to work in a stable posture with the same crane performance as on a horizontal ground, and it is possible to suppress torsion of the vehicle.

[Brief description of the drawings]

FIG. 1 is a plan view of a vehicle-mounted crane according to an embodiment of the present invention.

FIG. 2 is a side view of the vehicle-mounted crane.

FIG. 3 is a rear view of the vehicle-mounted crane.

FIG. 4 is a rear view showing a posture of a conventional vehicle-mounted crane when the vehicle is running.

FIG. 5 is a rear view showing a conventional vehicle-mounted crane installed on a slope.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crane 2 Outrigger 3 Base 4 Column 5 Boom 6 Crane mount 7 Crane mount support bracket 8 Support shaft 9 Tilt cylinder 10 Vehicle 11 Operator's cab 12 Carrier 13 Chassis frame 14 Rear wheel 15 Rear wheel 21 Horizontal arm 22 Horizontal arm 23 Outrigger Cylinder 24 Outrigger cylinder 25 Grounding member 26 Grounding member

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mitsuo Matsumoto 282-1 Okubocho, Ashikaga City, Tochigi Prefecture Rental Nikken Ashikaga Head Office F-term (reference) 3F205 AA08 EA06

Claims (2)

[Claims] 1. A vehicle-mounted crane, comprising: a crane mounting base that is tiltably attached to a vehicle; and a tilting unit that adjusts a tilt angle of the crane mounting base with respect to the vehicle. 2. The vehicle according to claim 1, wherein the tilting means is provided with a mechanism that releases the holding of the tilt angle when a load equal to or more than a predetermined value is applied and allows the crane mounting table to tilt freely. On-board crane.