JPS6152016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an outrigger device installed in a wheel-type working machine such as a truck crane, rough terrain crane, or wheel shovel.

As shown in FIGS. 6 to 8, this type of outrigger device is installed in two sets on both the front and rear sides of a traveling body A, each on the left and right sides, in an H-shaped arrangement as a whole, each with a fixed box B fixed to the traveling body A. An overhanging beam C is extended out and fitted in a retractable manner, and a retractable jack cylinder E having a float D at the lower end is fixed in a vertical position at the tip of this overhanging beam C.

However, this type of conventional outrigger device has the following problems. That is, this type of wheel-type working machine is subject to various restrictions on the body structure due to the fact that it runs on public roads. The height of the underside of the aircraft from the ground (hereinafter referred to as aircraft height) is one of them. Therefore, the jack cylinder E of the outrigger device is required to have an extension stroke that is the above body height plus a stroke for lifting the body off the ground. For this reason, the overall length of the jack cylinder E inevitably becomes long, and the amount of upward protrusion of the machine body increases accordingly. In this way, the jack cylinder protrudes above the machine for a long time, so the jack cylinder gets in the way during so-called close work such as piling work or loading work with a truck close to the machine, making the work very inconvenient. was.

Further, in order to improve the stability of supporting the fuselage, it is desirable that the overhanging beam C extends as long as possible to the outside of the fuselage. For this reason, the jack cylinder E is designed to fit completely within the legal aircraft width when the overhanging beam is retracted, but in this case, the outer half of the float D attached to the lower end of the jack cylinder E is It will protrude from within the width. Therefore, in the past, the float D had to be removed when driving on public roads, and this work of attaching and detaching the float was extremely troublesome. Furthermore, due to the necessity of attaching and detaching the float, the float D has to be made small in order to keep the weight of the float small, which is disadvantageous in terms of the stability of supporting the aircraft body.

In view of the above points, the present invention is a wheel type system that can suppress the amount of upward protrusion of the jet cylinder to a small extent while adhering to legal restrictions, and also allows the float to be kept within the width of the machine body when retracted. The purpose is to obtain an outrigger device for a working machine, and its configuration is as follows.

The present invention is configured such that the cylinder is pivoted to the tip of the overhang beam so as to be able to swing in the left and right directions using the upper part as a fulcrum, so that the cylinder can be drawn toward the inside of the overhang beam and stored in an inclined position. In addition to this, the rocking displacement of the jack cylinder from the vertical position to the above-mentioned tilted storage position is controlled by a projecting piece extending from the upper end of the cylinder to the tip of the fixed box when the beam is stored. The displacement from the tilted retracted position to the vertical position is achieved not only by natural displacement due to the cylinder's own weight, but also by the protrusion provided on the outer surface of the cylinder. This feature is characterized in that the extension operation of the cylinder can also be forced against a cam surface provided on the inner surface of the overhanging beam.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a traveling body frame, 2 is a fixed box fixed to the frame 1, 3 is an overhanging beam that extends over this fixed box and is fitted in a retractable manner, 4 is an overhang cylinder, and 5 is attached to the tip of the overhang beam 3. The jack cylinder 6 is a float attached to the lower end of the jack cylinder 5. The overhanging cylinder 4 has a rod end attached to the inner surface of the distal end of the overhanging beam, and a cylinder bottom attached to the inner surface of the proximal end of the fixed box 1. The extending and contracting operation of the overhanging cylinder 4 causes the overhanging beam 3 to be attached to the fixed box 2. It can be extended and retracted.

The cylinder tube 51 has a cylinder tube 51.
The rod 52 is placed at the tip of the overhang beam 3 in the opposite position to the conventional jack cylinder, with the rod 52 at the bottom and the rod 52 at the top. It is pivoted to 3. In this way, the jack cylinder 5 is attached to the tip of the overhanging beam so that it can swing in the left-right (width) direction of the aircraft with the upper part as a fulcrum, and when the outriggers are not used (when driving on public roads), the cylinder 5 is placed in a vertical position. As shown in FIG. 1, it is constructed so that it can be stored in the beam 3 in an inclined position by drawing and rotating the overhanging beam 3 inward using the upper part as a fulcrum.

Further, a protruding piece 54 is provided protrudingly provided at the upper end of the jack cylinder 5, that is, the tip of the rod 52, and the protruding piece 54 is provided at the upper end of the fixed box 2.
A push pin 22 is fixed at a height position corresponding to 4 through a bracket 21 in a horizontal position along the front-rear direction. 23 is a collar fitted onto the push pin 22. Projection piece 5 of the above-mentioned jack cylinder 5
4 and the push pin 22 come into contact with each other just before the end of the retracting stroke of the beam 3 when the overhanging beam is retracted, and during the remaining stroke, the protruding piece 54 is pushed by the push pin 22, and the jack cylinder 5 automatically returns to the above-mentioned inclined storage position. It is constructed so that it can be oscillated and displaced.
The contact surface of the protruding piece 54 with respect to the push pin 22 is formed into a dogleg shape as shown in the figure so that a stable contact state can be obtained.

Furthermore, a convex portion 55 having a U-shaped cross section is provided on both front and rear sides of the cylinder tube 51 of the cylinder 5, extending from the upper end to a predetermined position at the bottom, and a roller 56 is installed at the lower end of the convex portion 55. Convex portion 5
5. It is rotatably attached with a slight downward protrusion. On the other hand, a cam piece 7 having a cam surface 71 formed on the upper surface is integrally provided at a position below the roller 56 on both front and rear inner surfaces of the overhanging beam 3. The cam surface 71 of the cam piece 7 has an inclined circular arc trajectory that moves away from the roller 56 of the jack cylinder 5 downward as the jack cylinder 5 approaches the vertical position from the tilted storage position, that is, the swing of the jack cylinder 5. It is formed along an inclined circular arc curve centered on a point O ₂ (shown in Figures 4 and 5) located outside the fulcrum O ₁ in the width direction of the aircraft.
When the jack cylinder 5 is in the inclined storage position,
The roller 56 is now in contact with the inner end of the cam surface 71. Note that the cam surface 71 does not have to be the above-mentioned arc-shaped curved surface, but may be a linear inclined surface along the above-mentioned inclined locus. Further, a portion of the cam piece 7 outside the cam surface 71 is formed horizontally, and an engagement recess 72 is formed in the outside portion of the cam piece. The engagement recess 72 is formed with a width that allows the convex portion 55 of the jack cylinder 5 to engage with the center line, which is a perpendicular line drawn from the swing fulcrum _O1 of the jack cylinder 5. Therefore, when the cylinder 5 is vertical in the contracted position, the convex portion 55 faces above the engagement recess 72, and when the cylinder 5 is extended in this position, as shown in FIGS. The convex portion 55 descends and engages with the engagement recess 72.

Note that cutouts 24 and 31 are provided at the lower surfaces of the tips of the fixed box 2 and the overhanging beam 3 to allow the jack cylinder 5 to swing.

The float 6 can be swung in the left-right direction via pins 57 protruding from both front and back sides of the lower end of the cylinder tube of the cylinder tube 5, and a vertically long elongated hole 62 (shown in FIG. 3) provided in the float mounting seat 61. It is pivoted so that it can move.

In such a configuration, when using outriggers,
As shown in Figures 2 and 3, with the overhanging beam 3 extended outward from the aircraft body, the jet cylinder 5 is extended in a vertical position, the float 6 is grounded to float the aircraft, and various operations are performed in this state. . In this case, the jack cylinder 5 has the convex portion 22 of the cylinder tube 51 connected to the overhang beam 3 as described above.
By engaging with the engagement recess 72 of the cam piece 7 provided in the cam piece 7, it is locked in a vertical position, and sideways shaking and falling down during work is prevented.

When retracting the outrigger from this state, the jack cylinder 5 is contracted, the projection 55 is disengaged from the engagement recess 72, and the overhang beam 3 is pulled into the fixed box 2 and stored. . In this case, as shown in FIG. 4, just before the overhanging beam 3 is completely retracted into the fixed box 2, the protruding piece 54 at the upper end of the cylinder comes into contact with the push pin 22 of the fixed box 2, and
During the stroke from this point until the end of storage of the overhang beam 3, the protruding piece 54 is pushed outward by the push pin 22, so that the jack cylinder 5 swings into the inside of the overhang beam 3 around the pin 53. The cylinder 5 is finally stored in the overhang beam 3 in an inclined position as shown by phantom lines in FIGS. 1 and 4. At this time, the float 6 is
It is in close contact with the lower surface of the fixed box 2 while maintaining its horizontal position.

As described above, when using this device in which the jack cylinder 5 is stored in the overhang beam 3 in an inclined position when the outrigger is not in use, when the jack cylinder 5 is in a vertical position when in use,
Since the cylinder 5 protrudes below the overhang beam 3, in other words, the jet cylinder 5 can be made to protrude below the aircraft body to reduce the distance from the ground, so the required stroke of the cylinder 5 to float the aircraft is reduced. It is smaller than the conventional one.
Therefore, the overall length of the jack cylinder 5 can be reduced accordingly. Also, the jack cylinder 5
By allowing the cylinder 5 to protrude downward from the machine body in a vertical position, the amount by which the cylinder 5 projects upward from the machine body can be made smaller compared to conventional devices.

Therefore, when using this outrigger device, the synergistic effect of the following two points is achieved: (a) the overall length of the jack cylinder 5 can be reduced; and (b) the cylinder 5 can be made to protrude downward from the fuselage. The amount of upward protrusion can be kept much smaller compared to conventional devices. Therefore, there is no fear that the jack cylinder 5 will interfere with nearby work such as piling work, unlike in the past, which is very useful for work.

On the other hand, with the outriggers retracted, the float 6
is drawn toward the overhanging beam 3 side together with the jack cylinder 5 and completely fits under the fixed box 2. In other words, the float 6 does not protrude outward from the fuselage. There is no need to remove each cylinder from the cylinder 5. Furthermore, by eliminating the need to attach and detach the float, there is no need to suppress the weight of the float 6, so the float 6 can be made as large as possible without protruding outward from the fuselage in the stored state. This makes it possible to improve the stability of the aircraft support.

Next, the operation of swinging the jack cylinder 5 from the above-mentioned inclined storage position to the vertical position will be explained. When using the outriggers, if the overhanging beam 3 is extended outward from the machine body, the protruding piece 54 at the upper end of the jack cylinder 5 will push into the push pin 22 at the tip of the fixed box 2.
As a result, the jack cylinder 5 is released from the lock in the tilted storage position, and from this state, the jack cylinder 5 is naturally displaced to the vertical position by its own weight in principle. However, such natural displacement to the vertical position due to its own weight is prone to malfunctions due to rust on the swinging fulcrum part of the pin 53, foreign matter getting caught, or lack of lubricating oil, and it is difficult to ensure reliability. There's a problem. Therefore, in this device, if the natural rocking displacement of the cylinder 5 to the vertical position is not performed smoothly, the cylinder 5 is configured to be forcibly displaced to the vertical position. It is something.

That is, when the jack cylinder 5 is extended in the inclined storage position, the roller 5 provided on the cylinder 5
6 presses the cam surface 71 of the cam piece 7. As described above, this cam surface 71 is formed along an arcuate curve centered on the point O ₂ outside the swing fulcrum O ₁ of the jack cylinder 5, so that the roller 56 cannot be pressed against the cam surface 71. As a result, a force is applied to the jack cylinder 5 in a direction toward a vertical position.
By extending the cylinder 5 to a certain length in this manner, the cylinder 5 can be forcibly swung into a vertical position as shown in FIG. Therefore, when using this device, the swing displacement operation of the jack cylinder 5 can be reliably performed both from the vertical position to the tilted storage position and vice versa. Moreover, since there is no need to add a dedicated drive source such as a hydraulic cylinder for the swinging displacement of the jack cylinder 5,
The structure in this respect is extremely simple and the cost is low.

By the way, the locking means for locking the jack cylinder 5 in the vertical position is not limited to the above embodiment.
For example, it is possible to provide elastically retractable lock pins on both the front and rear surfaces of the tip of the overhanging beam 3, so that the lock pins are automatically engaged with lock holes provided on the jack cylinder 5 side. Tsuki cylinder 5 and overhang beam 3
A lock pin may be manually inserted into a lock hole provided on both sides. Furthermore, in the above embodiment, the cylinder 5 was installed at the tip of the overhanging beam with the cylinder tube 51 facing downward, but of course the cylinder 5 was installed with the cylinder tube 51 facing upward as in the prior art. You may. However, according to the above embodiment, the rod 52
Since the rod 52 is hidden inside the overhanging beam 3, it is possible to prevent damage to the rod 52, which is likely to occur, as well as oil leaks and malfunctions caused by this, and the cylinder tube 51 can be processed for locking means, etc. that should be added to the cylinder 5. This makes the processing easier.

On the other hand, in the above embodiment, the cam surface 7 provided on the side of the overhanging beam 3 is configured to forcibly swing and displace the jack cylinder 5 from the tilted storage position to the vertical position.
1, a freely rotatable roller 56 is provided on the jack cylinder 5 side, but in the present invention, it is sufficient to provide a protrusion on the jack cylinder 5 side with respect to the cam surface 71, and this protrusion Of course, it may also be fixedly provided on the jack cylinder 5. Further, the specific location of this protrusion on the outer surface of the jack cylinder 5 may be changed as appropriate when implementing the present invention.

As described above, according to the present invention, when the outriggers are retracted, the jack cylinder is drawn into the overhanging beam using the upper part as a fulcrum and is stored in the beam in an inclined position, thereby making it more advantageous than conventional outrigger devices. This makes it possible to significantly reduce the amount of upward protrusion of the jack cylinder, which is very advantageous for close work such as pile driving. In addition, since the float can be stored within the width of the machine along with the jet cylinder, there is no need to attach or detach the float every time you drive on public roads, and the float diameter can be increased to improve stability during outrigger work. It is possible.

Further, according to the present invention, the swinging displacement of the above-mentioned jack cylinder can be performed by itself without using a special drive source dedicated to it, so that the structure is simple and the cost is low. Moreover, the cylinder is oscillated from the vertical position to the tilted retracted position by the abutting action between the protrusion extended at the upper end of the cylinder and the tip of the fixed box, and from the tilted retracted position to the vertical position. In addition to the natural displacement method using the cylinder's own weight, the rocking displacement can be performed using a forced displacement method using protrusions provided on the outer surface of the jack cylinder and cam surfaces provided on the inner surface of the overhanging beam. The rocking displacement operation of the cylinder is highly reliable, and the device is highly durable.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of an embodiment of the present invention in a stored state, FIG. 2 is a longitudinal sectional front view of the same in a used state, and FIG.
The figure is an enlarged sectional view taken along the line shown in Fig. 2, Fig. 4 is a diagram for explaining the rocking displacement operation of the cylinder from the vertical position to the inclined storage position, and Fig. 5 is the cylinder in the inclined storage position. Figure 6 is a schematic side view of the entire truck crane to explain the conventional example, Figure 7 is a plan view of the same, and Figure 8 is an enlarged rear view of the same. It is. 1... Traveling body frame, 2... Fixed box,
3...Extended beam, 5...Jet cylinder,
53...Pin as a swinging fulcrum of the cylinder, 5
4... Protrusion piece on the upper end of the cylinder, 56... Roller as a protrusion of the cylinder, 71... Cam surface, 6...
…float.

Claims (1)

[Claims] 1. A fixed box fixed to a wheel-type traveling body, an overhanging beam overhanging this fixed box and fitted in a retractable manner, and a vertical position and a lower part pulled inward of the overhanging beam at the tip of this overhanging beam. and a jack cylinder having a float at the lower end, which is pivotally connected to the upper part as a fulcrum so as to be swingable in the left and right directions so as to be able to swing into a tilted storage position, and a jack cylinder having a float at the lower end. A projecting piece is extended, and the jack cylinder is configured to be able to swing from the vertical position to the inclined storage position by pressing the projecting piece outward with the tip of the fixed box when the overhanging beam is stored. On the other hand, a protrusion is provided on the outer surface of the jack cylinder, and a protrusion is provided below the protrusion on the inner surface of the overhanging beam along an inclined linear trajectory that moves away from the protrusion as the jack cylinder approaches the vertical position from the inclined storage position. An outrigger device for a wheel-type working machine, characterized in that it is provided with a cam surface.