JPS62275995A - Outrigger device for crane - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 6. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an outrigger device for a crane mounted on a truck or the like.

(Prior art) As a prior art similar to the present invention,
301 and as shown in FIG.

The former uses a link to connect the extended part of the outrigger device's cylinder to the base side, and when the outrigger device is extended laterally and touches the ground, the cylinder is extended and the tension is extended via the link. It is configured to be released.

The latter is an arrangement in which an inner cylinder having a float at the lower end is slidably inserted into the outer cylinder.The upper end of the outer cylinder of the IJ device is rotatably connected to the base of the crane. Rotate the outer cylinder of the outrigger device to the retracted position or extended position around the pivot connection point with the outrigger device, fix this outer cylinder in that position, and then extend the inner cylinder of the IJ gas device. The crane operation is performed by supporting the truck by grounding the float at the lower end of this inner cylinder.

In other words, in normal crane work, the inner cylinder is extended to support the truck with the outer cylinder in the retracted position, but when the stability of the truck is required, the outer cylinder is in the extended position. Extend the inner cylinder to support the L-rack. When the crane is not in use, the outer cylinder of the outrigger device is in a retracted position, and the inner cylinder is stored within this outer cylinder.

(Problems to be Solved by the Invention) In this type of crane, the crane work is performed after the IJ device is extended and the truck is stabilized. Therefore, it is desirable that the outrigger device automatically rotate from the retracted position to the extended position at the start of work.

By the way, in general, when the crane is not used in IJ gas equipment, that is, when the outer cylinder and inner cylinder are in the retracted position, the float at the lower end of the inner cylinder should be placed as high as possible to allow the truck to travel. It is desirable because it is safe.

When working with a trench crane, especially when the outer and inner cylinders are extended, it is desirable that the distance from the center of the crane to the ground contact position be as long as possible to increase the stability of the truck.

In the present invention, the outrigger device is constructed so that it can be automatically rotated from the retracted position to the extended position by using the weight of the IJ device itself, and the outer cylinder and inner cylinder are Although the height of the float above ground is the same as that of the latter, an outrigger device is provided in which the distance from the center of the crane to the float t when the outer cylinder and inner cylinder are extended is increased.

(Means to Solve the Problem) This is not possible, but in the present invention, the pivot point for rotating the outrigger device is aligned with a line that passes through the center of gravity of the outrigger device and is parallel to the central axis of the outrigger device. It is provided at an outer position in the eccentric direction of the overhang 1-7.

(Function) By making the rotation pivot point eccentric, the outrigger device will automatically rotate from the retracted position to the extended position until the center of gravity of the outrigger device is located on the vertical line passing through the rotation pivot point. become.

In addition, by making the rotation pivot point eccentric, it is possible to increase the extension length of the inner cylinder, and by making the rotation pivot point eccentric, it is possible to extend the inner cylinder when it is stored inside the outer cylinder. The ground height of the float at the lower end of the inner cylinder in the extended position of the cylinder, and the ground height of the float at the lower end of the inner cylinder in the retracted position of the outer cylinder with the inner cylinder stored in the outer cylinder. Since the heights are almost the same, the length of the inner cylinder extending in the lateral direction can be increased.

(Example) The structure of the present invention will be described below based on an example shown in the accompanying drawings. 1 and 5, 2 is an outer cylinder of the outrigger device 1 of the present invention, and inside this outer cylinder 2 there is a float 4 at the lower end.
An inner cylinder 3 having a diameter is slidably inserted therein. The cylinder device 5 moves the inner cylinder 3 from the outer cylinder 2 to the extended position or to the retracted position by loading the cylinder with the five-piece outer cylinder 2 and the inner cylinder 3 interposed. This outrigger device 1 is rotatably connected to a base B of the crane by a pin 7 at a position eccentric from the central axis of the outrigger device 1. That is, an ear part 2a having a protrusion facing outward, which is the direction in which the outrigger device extends, is fixed to the upper end of the outer cylinder 2, and the tip of this ear part 2a is connected to the base 6 by a pin 7.
Pivotally connected to allow free rotation. This outrigger device 1 is rotatably supported by a pin 7, and the position (B) shown by the imaginary line in FIG. 1, where this outrigger device 1 stops due to its own weight, is
This is the extended position of the outrigger device 1. That is, when the center of gravity G of this outrigger device in a state where the inner cylinder is housed in the outer cylinder is located on a vertical line passing through the pivot point 7, it is set at the extended position.

8 is a pin for holding this outrigger device 1 on the base 6 in the retracted position (B) or the extended position (B);
By selectively inserting this pin 8 into the hole 9 provided in the base B and the hole 10 or hole 11 provided in the outer cylinder 2, the outrigger device 1 is placed in the retracted position R (A) or the extended position (B). Hold. In other words, is pin 8 a hole? When it is inserted into the hole 10, it is in the retracted position (A), and when it is inserted into the hole 9 and hole 11, it is in the extended position (0). Note that this pin 8
is always inserted into the hole 9 under pressure from a spring 12, and when the outrigger device 1 is extended from the storage position (A) to the position C, the handle 8a of the pin 8 is pressed.
When this pin 8 is removed from the hole 10 by pulling, the outrigger device 1 will automatically rotate to the extended position (B) due to its own weight, and at that point the pin 8 will be automatically inserted into the hole 11. become.

Conversely, when changing from the extended position (B) to the retracted position (A), pull the handle 8a of this pin 8 with one hand to pull it out from the hole 11, and then use the other hand to pull this pin 8 out of the hole 11. A) If you rotate the IJ device 1 inward (at this point, let go of your hand that is pulling the pin 8), the pin 8 will automatically move into the hole 10 when it is rotated to the retracted position. Insert the IJ gas w1 into the storage position (a) and hold it in the retracted position (a).

In addition, in each state of the retracted position (A) and the extended position L to position C, the inner cylinder 6 is extended from the outer cylinder 2 and flow]
・By grounding 4, it goes without saying that the truck can be supported.

(Effects of the invention) (1) Since the pivot point of the outrigger device is eccentric from a line that passes through the center of gravity of the outrigger device and is parallel to the central axis of the outrigger device, the weight of the outrigger device automatically moves it to the retracted position. It will rotate from the position to the extended position.

(2) By making the rotation pivot point eccentric, the extension length of the inner cylinder is set to be longer by that amount compared to a case where the rotation pivot point is placed on the center axis of the Arara l-IJ device. Since the height of the float in the retracted position and the extended position of this outrigger device when the inner cylinder is stored in the twisted outer cylinder is not so high above the ground, the total contact length of the float in the lateral direction is This means that the truck can be held longer, increasing the stability of the truck during cargo handling operations.

[Brief explanation of the drawing]

FIG. 4 is a view of a crane equipped with an outrigger device of the present invention mounted on a truck, as seen from the rear of the trunk. 2...Outer cylinder, 3...Inner cylinder, 4...Float, 6...
... Base, 7... Pivot pin, 8... Pin, 9.1
0.11...hole. Figure 3 and Figure 4 r--11c □

Claims (1)

[Claims] 1. A crane configured such that the outer cylinder of an outrigger device, in which the inner cylinder is slidably inserted into the outer cylinder, is pivotally connected to the base of the crane so that the outrigger device can freely rotate to a retracted position or an extended position. In the outrigger device, the pivot connection point is provided at an outer position in the extending direction eccentric from a line passing through the center of gravity of the outrigger device and parallel to the central axis of the outrigger device. Outrigger device.