JPS6319380B2 - - 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. 7 to 9, 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, with fixed boxes 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 extremely 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 so that it fits completely within the legal aircraft width when the overhang 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, conventionally, the float D was removed every time the vehicle was driven on a public road, 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 has been developed to make it possible to reduce the amount of upward protrusion of the jet cylinder while adhering to legal restrictions, and to keep the float within the width of the machine body in the retracted state. The purpose is to obtain an outrigger device for a 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 above-mentioned jack cylinder is automatically changed from an inclined storage position to a vertical position, and vice versa, in conjunction with the expansion and contraction operation of the extending cylinder, Another feature is that the jack cylinder is locked in the vertically contracted position during the process of extending the extended 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 the fixed box 2 and is fitted therein so as to be retractable; and 4 is an overhang for extending and storing the overhanging beam 3. The cylinder 5 is a jack cylinder attached to the tip of the overhanging beam 3, and 6 is a float attached to the lower end of the jack cylinder 5.

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 retracted, the cylinder 5 is moved from the vertical position to the upper part as shown in FIG. It is constructed so that it can be stored inside the overhanging beam 3 in an inclined position with the fulcrum being drawn toward the inside of the overhanging beam 3. Further, a link 54 is provided to protrude downward from the upper end of the rod of this jack cylinder 5.

The overhanging cylinder 4 can swing vertically with respect to the fixed box 2 by pivotally connecting the base end of the cylinder tube 41 to the inner surface of the fixed box 2 via a horizontal shaft 42 along the longitudinal direction of the traveling body. It is installed. The distal end of the rod 43 of the extended cylinder 4 is rotatably connected to a link 54 protruding from the jack cylinder 5 via a horizontal shaft 44 that also extends in the front-rear direction. In this way, the overhang cylinder 4 and the jack cylinder 5 are interlocked and connected, and at the beginning of the extension of the overhang cylinder 4, while the cylinder 4 rotates downward around the horizontal axis 42, the jack cylinder 5 is directed toward the outside of the overhang beam. In addition, when the overhanging cylinder 4 is contracted, the cylinder 4 rotates upward around the horizontal axis 42 and pulls the jack cylinder 5 toward the inner side of the overhanging beam 3, contrary to the above. ing.

Next, the cylinder extension locking means for locking the jack cylinder 5 in the vertically extended position will be explained.

The cylinder tube 51 of the jack cylinder 5 has convex portions 55 protruding from the upper end to the vicinity of the lower end on both the front and rear sides. The convex portion 55 is formed in a step shape in which the outer half 55a in the width direction of the aircraft body has a larger protrusion dimension than the inner half 55b (hereinafter, the outer half 55a is a high portion, and the inner half 55b is a low portion). ). On the other hand, a lock block 31 which also serves as a guide is provided in an arcuate manner on the inner surface of both the front and rear sides of the tip of the overhanging beam 3, along the locus of movement of the lower end surface of the raised portion 55a as the jack cylinder 5 swings. However, an engaging recess 32 is formed at the terminal end of the lock block 31. This engagement recess 3
2 is formed with a width dimension that allows the high part 55a to engage with the convex part 55 of the cylinder 5 at a position facing below the high part 55a when the cylinder 5 is in the vertically contracted position. are doing. Therefore, when the jack cylinder 5 is extended from the vertically contracted position, the raised convex portion 55a engages with the engagement recess 32 from above. Further, the lock block 31 also serves as a guide for guiding the lower end surface of the convex high portion 55a when the jack cylinder 5 swings, and also serves as a guide when the jack cylinder 5 is erroneously extended in an inclined position. Performs the function of a stopper.

On the other hand, to explain the cylinder lock mechanism for preventing the jack cylinder 5 from swinging in the vertically contracted position during the process of extending the overhang beam 3, as shown in Figs. A lock pin 7 is held at the lower end of one side via a compression coil spring 71 so as to be elastically retractable into and out of the overhang beam 3. A vertically long head 72 is connected to the end of the lock pin 7 that protrudes outside the overhang beam 3, and the head 72 is fixed to the lower outer surface of the tip of the fixing box 2 at a predetermined interval vertically. It is locked to the outer surface of a pair of cam pieces 8, 8 provided therein. On the outer surface of this cam piece, a slanted cam surface 81 is formed which slopes downward toward the tip of the fixed box 2 in plan view.
By sliding on this cam surface 81, the lock pin 7 protrudes inward from the overhang beam 3, and finally the tip of the lock pin 7 touches the lower part 55b of the convex part 55 of the jack cylinder 5 in the vertically contracted position. It is configured so that it can engage with the protrusion 55 in a state of contact. By engaging the lock pin 7 with the convex portion 55, the jack cylinder 5 is prevented from swinging inward of the overhanging beam in the vertically contracted position.

In FIGS. 3 and 4, reference numeral 21 designates a slot for leading out the head 72 of the lock pin 7 to the outside of the fixing box 2. Furthermore, cutouts 22 and 33 are provided on the lower surfaces of the ends of the fixed box 2 and the overhanging beam 3 to allow the jack cylinder 5 to swing. Further, in FIG. 1, 23 is a lock pin for locking the overhang beam 3 in the retracted state.

The float 6 includes pins 5 protruding from both front and rear sides of the lower end of the cylinder tube 51 of the cylinder tube 51.
6, and a long hole 62 provided in the float mounting seat 61
(shown in FIG. 4), which are pivotally connected so as to be swingable in the left-right direction.

Next, the effect will be explained.

When using the outriggers, the overhang cylinder 4 is extended from the state shown in FIG. 1 to extend the overhang beam 3 outward from the fuselage as shown in FIG. The aircraft is grounded and the aircraft is floated, and various operations are performed in this state.

Thus, in the extended beam retracted state, the jack cylinder 5 is in an inclined retracted position as shown in the figure. When the overhang cylinder 4 starts to extend when the overhang beam 3 is extended, the cylinder 4 rotates downward by itself around the horizontal axis 42 as described above, and the rod 43 links the jack cylinder 5. Press 54. As a result, the jack cylinder 5 rotates around the horizontal pin 53 and assumes a vertical position, and from this point on, the tensioning force of the extension cylinder 4 is applied to the extension beam 3, and the extension of the beam 3 is started. Become.

On the other hand, when the jack cylinder 5 is in the vertical position as described above, the tip of the lock pin 7 is connected to the convex portion 55 of the jack cylinder 5, as shown in FIGS.
From this state, as the overhanging beam 3 moves, the lock pin 7 is guided by the cam surfaces 81, 81 of the cam pieces 8, 8 provided on the fixed box 2, as described above. As a result, it advances into the overhanging beam 3, and eventually comes into contact with the lower protrusion portion 55b and engages with the protrusion portion 55. This makes it possible to prevent the jack cylinder 5 from swinging while the overhang beam 3 is moving. In addition, there are cases where the overhang beam 3 is once extended to full extension or nearly full extension, and then slightly reduced to correct the overhang length. Displacement can be prevented by the lock pin 7. Therefore, the overhang length can be adjusted quickly and smoothly.

After extending the overhanging beam, when the jack cylinder 5 is extended, the high portion 55a of the convex portion 55
is engaged with the engagement recess 32 of the lock block 31 provided on the inner surface of the overhanging beam 3, whereby the cylinder 5 is locked in the vertically extended position;
Prevents sideways shaking and falling during work.

Next, when retracting the outriggers, the jack cylinder 5 is contracted, and the overhanging beam 3 is
is pulled into the fixed box 2 and stored. When the overhanging beam 3 is retracted, the jack cylinder 5 is pulled inward of the overhang cylinder 4 due to the contraction of the overhang cylinder 4, but at this time the jack cylinder 5 is prevented from swinging by the lock pin 7. . Therefore, during the beam retraction stroke, the jack cylinder 5 is held in a vertically contracted position, and the contracting force of the overhang cylinder 4 is transmitted to the overhang beam 3 via the jack cylinder 5 and the lock pin 7.

Immediately before the end of the retraction stroke of the overhang beam 3, the head 72 of the lock pin 7 slides on the cam surfaces 81, 81 of the cam pieces 8, 8 provided on the fixed box 2, thereby locking the lock pin 7.
is pulled outward from the beam, so that the lock pin 7 separates from the lower convex portion 55b of the jack cylinder 5. As a result, the jack cylinder 5 is unlocked in the vertical position, and from the time the overhang beam 3 is completely retracted, the jack cylinder 5 is pulled by the overhang cylinder 4 and automatically changes from the vertical position to the tilted storage position. It undergoes a rocking displacement and finally returns to the state shown in FIG. At this time, the float 6 is brought into contact with the lower surface of the fixed box 2 in a horizontal position.

In this way, when using this outrigger device in which the jack cylinder 5 is stored in the overhanging beam 3 in an inclined position when the outriggers are stored,
When the jack cylinder 5 is placed in a vertical position during use, the cylinder 5 protrudes below the overhang beam 3. In other words, the jack cylinder 5 protrudes below the fuselage to reduce the distance from the ground. Therefore, the required stroke of the cylinder 5 to float the aircraft is smaller than that of the conventional one. Therefore, the overall length of the jack cylinder 5 can be reduced accordingly. Furthermore, since the cylinder 5 can protrude downward from the aircraft body in a vertical position, the cylinder 5
It is possible to reduce the amount by which the plane protrudes upward from the fuselage.

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 aircraft body.
It is possible to reduce the amount by which the device protrudes upward from the fuselage to a much smaller extent than with conventional devices. For this reason,
There is no longer any risk that the jack cylinder 5 will interfere with nearby work such as piling work, as was the case in the past.
It will be very useful for your 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. , thereby increasing the stability of the aircraft support.

In addition, when using this device, the swing displacement operation between the vertical position and the tilted storage position of the jack cylinder 5 can be automatically and forcibly performed using the expansion and contraction operation of the overhanging cylinder 4. Therefore, the reliability of this jack cylinder displacement operation is excellent, and there is no need for extra operations regarding this operation. Furthermore, there is no need to add a dedicated drive source such as a hydraulic cylinder for this cylinder rocking displacement. Moreover, in the above embodiment in which the overhanging cylinder 4 itself is attached to the fixed box 2 so as to be able to swing in conjunction with the jack cylinder 5, and is directly interlocked and connected to the jack cylinder 5, the structure becomes particularly simple. , both cylinders 4 and 5
The interlocking will be reliable and stable.

By the way, in the above embodiment, the convex part 55 consisting of the high part 55a and the low part 55b is provided on the side of the cylinder 5, and the lock pin 7 is attached to the convex part 55 in a state where it is in contact with the low part 55b of the convex part 55. Although the lower portion 55b is omitted, a convex portion may be provided on the cylinder 5 side, and the lock pin 7 may be engaged with the side surface of this convex portion.

On the other hand, according to the above embodiment in which the cylinder tube 51 is attached to the tip of the overhanging beam in a position opposite to the conventional one, with the cylinder tube 51 on the lower side and the rod 52 on the upper side, the rod 52 is placed inside the overhanging beam 3. Since it is hidden, it is possible to prevent damage to the rod 52 that is likely to occur, as well as oil leakage and malfunction due to this, and since it is sufficient to perform processing on the cylinder tube 51 for the locking means etc. that should be added to the cylinder 5, the processing can be done easily. becomes easier. However, in the present invention, the jack cylinder 5 may be installed with the cylinder tube 51 facing upward, as in the conventional case. In such a case, the overhang cylinder 4
and the cylinder tube 51 of the cylinder 5, but at this time, both 4,
51 may be directly pivotally connected without using the link 54 as in the above embodiment.

On the other hand, the cylinder extension locking means for locking the jack cylinder 5 in the vertically extended position is not limited to the above-mentioned embodiment. It is also possible to have the lock pin automatically engage the lock hole provided on the side of the jack cylinder 5, or manually insert the lock pin into the lock hole provided on both the jack cylinder 5 and the overhang beam 3. It is also possible to make it more crowded.

In addition, the overhang cylinder 4 and the jack cylinder 5
Regarding the interlocking connection structure, for example, the overhanging cylinder 4 is mounted so as not to swing
and the jack cylinder 5 may be interlocked and connected via an intermediate transmission mechanism such as a link mechanism. or,
The overhanging cylinder 4 is extended within a certain length range from the overhanging beam 3 and connected so as to be freely movable in the storage direction, and the jack cylinder 5 is retracted at an angle within the free movement stroke of the overhanging cylinder 4 with respect to the overhanging beam 3. A structure may be adopted in which the overhanging cylinder 4 and the jack cylinder are interlocked and connected via a link mechanism or a pin and a long hole so as to be able to swing from a vertical position to a vertical position or vice versa.

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 by utilizing the expansion and contraction operation of the extending cylinder without using a special drive source dedicated for it, so that the structure is simplified. This is simple and inexpensive, and the cylinder rocking displacement operation is reliable and reliable. In addition, when the overhanging beam is extended from the fixed box, the cylinder lock mechanism can lock the jack cylinder in the vertically contracted position at any position, which prevents rattling of the jack cylinder during the extension and retracting strokes of the overhang beam. In addition, even when the beam is returned to the storage direction during the extension process to adjust the extension length, it is possible to prevent the jack cylinder from swinging in the direction of the inclined posture.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention in a stored state; FIG. 2 is a longitudinal sectional front view showing a state in which the jack cylinder is displaced to a vertical position during use;
Figure 3 is an enlarged sectional view along the line of Figure 2;
The figure is a sectional view taken along the line of Fig. 3, Fig. 5 is a view corresponding to Fig. 3 in the cylinder locked state, Fig. 6 is a longitudinal sectional front view showing the outrigger extended usage state, and Fig. 7 is for explaining the conventional example. 8 is a schematic side view of the entire truck crane, FIG. 8 is a plan view thereof, and FIG. 9 is an enlarged rear view. 1... Traveling body frame, 2... Fixed box,
3... Overhanging beam, 4... Overhanging cylinder, 5
...Judge cylinder, 42...Horizontal shaft as a swinging fulcrum of the overhanging cylinder, 44...Horizontal shaft for pivotal connection between the cylinder and the jack cylinder, 53...
...Horizontal pin as a swinging fulcrum of the jack cylinder, 6...Float, 7...Lock pin, 71...
...Spring, 72...Lock pin head, 81...
...Cam surface, 55...Convex part of the jack cylinder that becomes the lock pin engaging part.

Claims (1)

[Claims] 1. A fixed box fixed to a wheel-type traveling body, an overhanging beam fitted to the fixed box so as to be able to be extended and retracted, an overhang cylinder that extends and stores this overhang beam, and an overhang cylinder provided at the tip of the overhang beam. and a jack cylinder having a float at its lower end. The jack cylinder is pivotably mounted to be pivotable in the left and right direction using the fulcrum as a fulcrum, and the jack cylinder is pivoted from the tilted storage position to the vertical position or vice versa in conjunction with the expansion and contraction operation of the extending cylinder. A cylinder which interlocks and connects the jack cylinder and the above-mentioned overhanging cylinder, and which locks the jack cylinder in a vertically contracted position when the overhang beam is extended, and is interposed between the above-mentioned overhang beam tip, the fixed box tip, and the jack cylinder. A locking mechanism is provided, and this cylinder locking mechanism is shaped like a headed pin, and its tip faces inward of the overhanging beam, and the cylinder is extended so that it can move inward and outward directions with its head projecting outward from the beam. A lock pin provided on the beam, a spring that presses the lock pin toward the inside of the overhanging beam, a cam surface formed on the fixed box in an inclined shape that slopes downward toward the front end of the box in plan view; A lock pin engaging portion provided on the outer surface of the jack cylinder is provided, and when the overhang beam is extended, the head of the lock pin is brought into sliding contact with the cam surface of the fixed box, thereby causing the lock pin to move inward of the overhang beam. 1. An outrigger device for a wheel-type working machine, characterized in that the outrigger device is configured so that it can be advanced and its tip can be engaged with a lock pin engaging portion of the jack cylinder.