JPS6149139B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an outrigger device for stably supporting a traveling cargo handling machine.

(Prior Art) Outrigger devices used in traveling cargo handling machines are roughly divided into those that have an overhanging beam and those that do not. The latter has a jacking device attached downward at the outer end of the vehicle frame, and is configured to lift and support the vehicle body by extending this. Generally, such an outrigger device 1 is , 2 is often used in truck cranes having a small crane device 3 mounted on the front part of the truck loading platform 2, as shown in FIG. In order to more effectively exhibit the stabilizing effect, the outrigger device 1 is attached to both ends of the vehicle frame directly below the crane device 3 mounted on it, and especially when the crane device 3 is installed near one side of the loading platform, the outrigger device 1 is installed on the side where the crane device 3 is installed. The device 1 is normally constructed so that the outrigger device 1 can extend diagonally outward so that the ground contact position of the leg plate 4 is as outward as possible.

(Problem to be solved by the invention) However, on both sides of the lower part of the front part of the loading platform 2,
Since a reinforcing plate called a gusset 5 is attached to reinforce the strength of the gusset 5, when the outrigger device 1 is extended diagonally outward as described above, the gusset 5 and the outrigger device 1 may interfere with each other. (See Figure 3, when the outrigger device 1 is extended, the locus of the upper outer end of the cylinder crosses the gusset 5.) To avoid this, cut out the gusset 5 and remove the outrigger device 1. It was necessary to attach the outrigger device 1 or to reduce the angle of inclination when the outrigger device 1 is extended. However, this would reduce the strength of the gusset 5 and the stability provided by the outrigger device 1.

Therefore, the present invention provides an outrigger device that is configured to be able to project outward at a sufficient angle of inclination without cutting out the gusset 5, that is, without interfering with it.

(Means for Solving the Problem) The present invention, as a means for solving the problems of the prior art, provides a telescoping cylinder whose upper part is fixed to the vehicle frame and can be extended downward, and the tip of the piston rod. a hydraulic cylinder rotatably supported on the vehicle frame and arranged in parallel with the telescopic cylinder, and a lower end of the telescopic cylinder and a hydraulic cylinder located above the lower end of the telescopic cylinder in the contracted state of the telescopic cylinder and the hydraulic cylinder. An outrigger device rotatably connects cylinders at appropriate positions, wherein the telescoping cylinder is provided with a releasable restriction device that restricts the amount of expansion thereof to an amount smaller than the expansion stroke of the hydraulic cylinder. It is characterized by:

(Function) With this configuration, when the leg plate is extended to the outside of the vehicle from the state where the telescoping cylinder and hydraulic cylinder are contracted, the regulating device restricts the amount of expansion of the telescoping cylinder to an amount smaller than the amount of expansion of the hydraulic cylinder. When the hydraulic cylinder is extended, the hydraulic cylinder and telescoping cylinder first extend directly downward, and then, after the expansion of the telescoping cylinder is regulated by the front regulating device, the hydraulic cylinder is extended outward from the vehicle by the action of the link. It is something that is extended to.

(Example) Examples will be described below.

Reference numeral 11 denotes an outer cylinder fixed to the end of the vehicle frame 6, into which an inner cylinder 12 is slidably inserted to form a telescopic cylinder 10. 33 is an elongated hole drilled along the axis in the center of the inner cylinder 12, into which the pin 21 inserted through the hole 30 provided in the outer cylinder 11 is fitted, and the inner cylinder 12 is attached to the outer cylinder 11. The elongated holes 33 and 3
0. The pin 21 also constitutes an expansion restriction device for the telescopic cylinder 10. This restriction device makes it possible to release the restriction on the extension of the telescoping tube 11 by removing the pin 21. Reference numeral 14 denotes a hydraulic cylinder, in which the end of a piston rod 15 is rotatably attached to the outside of the base end of the outer cylinder of the vehicle frame 6.
are arranged along the outer cylinder 11.

A bracket 18 to which a leg plate 17 is fixed is pivoted to the lower end of the cylinder tube 16. This bracket 18 and the bracket 13 provided at the tip of the inner cylinder 12 have holes 1, 9, and 20, respectively, and these holes 19, 20 are aligned to insert the replacement pin 2.
By inserting 1, they can be connected to each other. A link 2 is connected between the cylinder tube 16 at a proper position and the bracket 13 at the tip of the inner cylinder by means of pivots 22 and 23.
4 are rotatably connected.

Reference numeral 25 denotes a stopper which is swingably supported on the shaft 23 and is always biased against the inner cylinder 12 by a coil spring 27 so as to be tilted to the left in the figure.
Reference numeral 34 denotes a projection provided on the pivot shaft 23 that supports the link 24 and rotates together with the link 24. The projection 34 is connected to the pin 3 implanted in the stopper 25.
1, and when the hydraulic cylinder 14 is in the retracted state in which it is retracted along the telescopic tube 11, the stopper 25 is tilted rightward in the figure against the spring 27. As a result, when the hydraulic cylinder 14 extends and the link 24 rotates counterclockwise, the engagement between the protrusion 34 and the pin 31 is released, and the head of the stopper 25 is positioned so as to protrude from the hole 26 of the inner cylinder 12. This restricts the contraction of the inner cylinder 12 into the outer cylinder 11. When the hydraulic cylinder 14 contracts and the link 24 rotates clockwise, the protrusion 3
4 pushes the pin 31 to return the stopper 25 to its original position. (The stopper 25, the protrusion 34, and the pin 31 are a contraction restraining mechanism for the inner cylinder 12.)

Reference numeral 28 denotes a guide provided on the link 24 in order to non-swingably attract the hydraulic cylinder 14 to the telescopic cylinder 10 when the hydraulic cylinder 14 and inner cylinder 12 are at their maximum contraction, and 29 is a guide implanted in the outer cylinder 11. It's a pin. In addition, the replacement pin 21 is for the outer cylinder 11 and the inner cylinder 1.
When inserted between the hole 30 (outer cylinder) and the elongated hole 33 (inner cylinder) to regulate the amount of sliding between the two, and when inserted between the hole 19 (bracket 18) and the hole 19 (bracket 18) to connect the hydraulic cylinder 14 and the inner cylinder 12. It may be inserted between the holes 20 (brackets 13), and the former is selected when the outrigger device 1 is to be extended outward and grounded, and the latter is selected when the outrigger device 1 is to be grounded directly below. It is something to do.

Next, the effect will be explained. First, a case will be described in which the outrigger device 1 is extended and grounded. , 4th
Please refer to FIG. 8 from the figure. As shown in FIG. 4, the outrigger device 1 in the retracted state is connected to the hydraulic cylinder 1.
4 and the inner cylinder 12 are minimized, and the replacement pin 21 inserted through the hole 30 of the outer cylinder 11 is located at the lower end of the elongated hole 33, and the stopper 25 is inserted into the hole 30 of the outer cylinder 11, so that the pin 31 engages with the protrusion 34. It is located freely within the inner cylinder 12. In addition, since the replacement pin 21 is used alternatively, the hole 19 of the bracket 18 and the bracket 13
It is not inserted into the hole 20. When the hydraulic cylinder 14 is extended from this state, the hydraulic cylinder 1
Inner cylinder 12 connected by link 24 as 4 descends
also descends. However, since the inner cylinder 12 stops descending when the pin 21 reaches the upper end of the elongated hole 33 (see Fig. 5), if the hydraulic cylinder 14 extends any further, it will move around the pivot 23 provided at the lower end of the inner cylinder 12 as a fulcrum. Hydraulic cylinder 14 by rotating link 24
expands outwards. At this time, the rotation of the link 24 causes the protrusion 34 provided on the pivot 23 to release the pin 31, and the stopper 25 is rotated to the left by the biasing force of the spring 27. Due to this rotation, the head of the stopper 25 protrudes from the hole 26 and touches the lower end of the outer cylinder 11, so the inner cylinder 12 is restricted from contracting into the outer cylinder 11, so the outrigger device 1 stabilizes the vehicle body while being in contact with the ground. (See Figure 6). The locus of movement of the upper outer end of the cylinder tube 16 at this time is as shown as L in FIG. The first linearly descending portion is the portion where the hydraulic cylinder 14 has descended together with the inner cylinder 12, and therefore its length is the same as the length of the elongated hole 33. The curved portion after that is the locus while being extended by the link 24. As is clear from the comparison between the locus L in Fig. 6 and the locus of movement of the conventional outrigger device in Fig. 3, the gusset 5
However, since L passes under the gusset 5 of the same length, there is no need to cut out the gusset 5 or reduce the overhang angle. It means.

The same movement trajectory is drawn when the outrigger device 1 is retracted, and the movement of each part in this case will be explained as follows. That is, the hydraulic cylinder 14
When starts to shrink, the link 24 also rotates clockwise. Then, when the hydraulic cylinder 14 is reduced by half, the protrusion 34 provided on the pivot 23 pushes the pin 31 to return the stopper 25 to its original position. The head is retracted into the inner cylinder 12, and the inner cylinder 12 becomes deflated.

When the hydraulic cylinder 14 further contracts, the inner cylinder 12 also contracts into the outer cylinder 11, and the hydraulic cylinder 1
4, it returns to its original storage state in the most contracted state.

Incidentally, since the outrigger device 1 of the present invention can also be grounded at a position directly below the structure described above, this case will be explained. In this case, the replacement pin 21 is removed from the hole 30 and the elongated hole 33 through the hole 1.
9 (bracket 18) and hole 20 (bracket 1
3) to connect the hydraulic cylinder 14 and the inner cylinder 12. Note that at this time, since the amount of expansion of the inner cylinder 12 is not restricted by the replacement pin 21 and the elongated hole 33, the inner cylinder can be expanded by the same amount as the hydraulic cylinder 14. Therefore, the hydraulic cylinder 14 is connected to the inner cylinder 12.
It extends to the most extended state while being guided by the ground, and touches the ground directly below in the most extended state (see Fig. 7). When the hydraulic cylinder 14 is contracted, the inner cylinder 12 contracts together with the hydraulic cylinder 14 into the outer cylinder 11.
Both are in the stored state in the most contracted state.

(Effects) As explained above, the outrigger device 1 of the present invention
When touching the ground with an overhang, its movement first draws a downward trajectory, then diagonally outward.
It is possible to achieve the above-mentioned purpose.

[Brief explanation of the drawing]

Fig. 1 is a side view of a truck crane using the outrigger device of the present invention, Fig. 2 is a rear view of the same, Fig. 3 is an explanatory diagram of the operation of the conventional outrigger device, and Fig. 4
8 to 8 are explanatory views of the operation and structure of the outrigger device of the present invention. Car frame...6, Telescopic tube...11, Hydraulic cylinder...
...14, Link...24.

Claims (1)

[Claims] 1. A telescoping tube whose upper portion is fixed to the vehicle frame and is extendable downward, and a hydraulic cylinder whose piston rod tip is rotatably supported by the vehicle frame and arranged in parallel with the telescoping tube. and an outrigger device in which a lower end of a telescoping cylinder is rotatably linked to a cylinder proper position of the hydraulic cylinder located above the lower end of the telescoping cylinder in a contracted state of the hydraulic cylinder, and the telescoping cylinder has an extension amount. An outrigger device comprising a releasable regulating device that regulates the extension amount to be less than the extension stroke of the hydraulic cylinder.