JPH0141598B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a swivel base with inclination correction that is used, for example, in an elevated work vehicle such as a ladder vehicle.

Conventional technology In general, when an aerial work vehicle such as a ladder vehicle is stopped on a slope, in order to improve work safety, the work machine such as a ladder on a swivel platform is moved within a vertical plane. It is necessary to correct the inclination in some way so that it can move up and down.

There are two ways to correct the inclination so that the boom on the swivel platform can be raised and lowered within the vertical plane. One method is to equip the boom with a posture correction device so that the boom is positioned within the vertical plane, and the other is to level the vehicle body using outriggers. There are known ways to do this.

Problems to be Solved by the Invention The two conventional correction methods described above have the following problems.

In other words, in the former method that includes a correction device, the tilt of the ladder is corrected while the swivel base remains tilted, so a correction operation is required every time the swing position changes, which is not only unreasonable in terms of operation, but also causes damage to the ladder. It becomes necessary to incorporate the correction device into the device that makes the up and down movement, which complicates the mechanism.

In addition, in the latter method of using outriggers,
In order to level the vehicle itself, it is necessary to lift the wheels off the ground, and the outriggers require a particularly large support capacity and vehicle lifting stroke.Furthermore, the mounting position of the outriggers is limited in order to obtain stability in the event that the wheels float. This is a restriction on vehicle body settings.

Means for Solving the Problems The present invention was proposed in order to solve the problems of the above-mentioned conventional inclination correction method. By placing two overlapping rings in between and rotating the two rings by a predetermined angle, the car body can be placed on the table depending on the relative angle of the overlap of the two rings and the direction of the two overlapping rings. The table is tilted horizontally by giving it a predetermined inclination and direction.

That is, the present invention includes a first ring fixed to the vehicle body at the turning center of the aerial work vehicle, a second ring rotatably supported by the first ring via a first rolling bearing, a third ring rotatably supported on the second ring via a second rolling bearing having an axis oblique to the axis of the first rolling bearing; The third rolling bearing has an axis that is oblique to the axis of the second rolling bearing and is located in a position parallel to the first rolling bearing when the tilt correction operation is not performed. a fourth ring rotatably supported on the fourth ring; a table fixed on the fourth ring; a device for preventing the table from rotating with respect to the vehicle body; a first fixing device that fixes the second ring so that it does not rotate relative to each other; a second fixing device that fixes the second ring and the third ring so that they do not rotate relative to each other; An aerial work vehicle comprising a first drive device that relatively rotates a first wheel and a second wheel, and a second drive device that relatively rotates a table and a third wheel. This is a swivel table with tilt correction.

Embodiment Fig. 4 shows an aerial work vehicle to which the present invention is applied. A support frame is installed on the base 2, 4 is a ladder whose root portion is pivotally connected to the support frame 3, 5 is a cylinder for raising and lowering the ladder 4, 6 is an outrigger, and 7 is a ladder receiver.

The structure of the swivel table 2 with tilt correction is as shown in FIG. In the figure, 8 is a first wheel attached to the vehicle body 1 with a mounting bolt 9, and 10 is a first wheel 8.
A second ring 12 is rotatably supported on the second ring 10 via a first rolling bearing 11;
A third ring 14 is rotatably supported via a second rolling bearing 13 having an axis b oblique to the axis a of the rolling 11; The third rolling bearing 15 has an oblique axis c with respect to the axis b of the third rolling bearing 13 and is located in a position parallel to the first rolling bearing 11 when the tilt correction is not performed. A freely supported fourth ring 16 is a table mounted on the fourth ring 14 with mounting bolts 9, and 17 is a rotation prevention device to prevent the table 16 from rotating with respect to the vehicle body 1. As shown in FIG. 2, a pin 19 is inserted into a sleeve 18 extending integrally from the lower surface, and the lower end of the pin 19 protruding from the sleeve 18 is inserted into an oblong hole 20 bored in the vehicle body 1. It is loosely fitted. 21 is the first ring 8 and the second ring 10
A first fixing device that fixes the first ring 8 together.
A fixing bolt 22 is screwed into the fixing bolt 22 so that the fixing bolt 22 can move forward and backward toward the axis a of the first rolling bearing 11.
The lining 23 can be firmly pressed and fixed to the outer peripheral surface of the second ring 10 at the tip thereof. 24 is a second fixing device that fixes the second ring 10 and the third ring 12 together, and a fixing bolt 2 is attached to the third ring 12 so as to be movable toward the axis b of the second rolling bearing 13.
5 is screwed in, and the lining 26 can be firmly pressed against the outer circumferential surface of the second ring 12 with the tip of the fixing bolt 25 to fix it. 27 is a drive device installed in the vehicle body 1, and a gearbox 29 is attached to the handle 28.
A small gear 31 fixed to the upper end of a rotating shaft 30 that extends upward through the vehicle body 1 is connected to the
The ring 10 is meshed with a large gear 32 integrally formed at the lower end of the inner circumferential surface of the ring 10. Reference numeral 33 denotes a drive device installed on the table 16, which drives a small gear 37 fixed to the lower end of a rotating shaft 36 that is connected to the handle 34 via a gear box 35 and extends downward through the table 16. It meshes with a large gear 38 integrally formed on the upper end of the outer peripheral surface of the ring 14.

The above is the configuration of the present invention. Next, based on the above configuration, the operation will be sequentially explained, taking as an example the case where the vehicle body 1 is installed on the ground where the left side in the figure is low as shown in FIG. 4.

First, in the state shown in FIG. 1, the fixing bolt 22 of the first fixing device 21 and the fixing bolt 25 of the second fixing device 24 are loosened, and the first ring 8 and the second ring 10 are removed.
and the fixation of the second ring 10 and the third ring 12 are released. Next, the rotating shaft 30 is rotated by the handle 28 of the first drive device 27, and the second ring 10 is rotated by the meshing of the small gear 31 and the large gear 32. Then, the second wheel 10 rotates relative to the vehicle body 1 and the table 16, and the second rolling bearing 13 also becomes inclined in the direction shown in FIG. 3. In this state, the fixing bolt 22 of the first fixing device 21 is tightened to fix the second ring 10 to the first ring 8. Next, the rotating shaft 36 is rotated by the handle 34 of the second drive device 33, and only the third ring 12 is rotated by the meshing of the small gear 37 and the large gear 38. Then, since the third ring 12 is supported by the second ring 10 via the inclined second rolling bearing 13, the lower left side of the fourth ring 14 and the table 16 are lifted up. This operation is continued until the table 16 becomes horizontal, and when the inclination of the table 16 is corrected and becomes horizontal as shown in FIG.
Tighten the fixing bolt 25 of the
fixed to the ring 10. In this state, the pin 19 of the detent device 17 is removed, the detent of the table 16 is released, and the handle 34 of the second drive device 33 is removed.
When the rotating shaft 36 is rotated, the table 16 rotates on a horizontal plane due to the engagement of the small gear 37 and the large gear 38.

Note that in the above operation description, first the first drive device 2
7 rotates the second wheel 10, and then the second drive device 33 rotates the third wheel 12 and table 16. It is up to you which one to do first,
The third drive of the second wheel 10 by the first drive 27
It is also possible to rotate the wheel 12 and the second drive device 33 to be dedicated to the rotation of the table 16. Note that if the third ring 12 is rotated before the second ring 10, the third ring 12, once positioned, must be rotated so that it does not move when the second ring 10 rotates. , a third fixing device (not shown) for fixing the third ring 12 to the fourth ring 14 or the table 16
is required. This third fixing device can have the same structure as the first or second fixing device 21, 24, but it can also have a structure similar to that of the first or second fixing device 21, 24.
The second drive device 33 can be prevented from being moved from the third wheel 12 by using a worm gear or the like for the power transmission mechanism from the third wheel 12 to the third wheel 12, or by providing a lock mechanism in this power transmission mechanism. The power transmission mechanism itself can also be used as the third fixing device. In addition, the power transmission mechanism of the first drive device 27 is
It is also possible to provide a fixing mechanism for the second wheel 10, similar to the power transmission mechanism of the second drive device 33 described above, and use this as the first fixing device. In this case, the first fixing device 21 shown is not necessary.

Although one embodiment of the present invention has been described above, each component can be changed to have the same function. An example of this modification will be explained next.

As shown in the above embodiment, the swivel base 2 has a second ring 10 inside the first ring 8, a third ring 12 outside the second ring 10, and a third ring 10. In addition to the combination in which the fourth ring 14 is placed inside the ring 12, any combination of inside and outside can be adopted.

The first and second drive devices 27 and 33 may be of the manual type as described above, or may be one using an electric motor, a hydraulic motor, or the like. In addition to the method of transmitting power from the first and second drive devices 27 and 33 to the second and third wheels 10 and 12, in addition to the method using an external gear and an internal gear as in the embodiment, a method using a worm gear is also available. Any method such as drive, belt drive, chain drive, etc. can be adopted.

In the above embodiment, the first and second fixing devices 21 and 24 are of the type that presses the running 23 and 26 with fixing bolts 22 and 25, but
In addition, any other fixing method can be adopted, such as using a hydraulic cylinder or an air cylinder as the driving means, or inserting a locking pin into a hole provided in the second or third wheels 10, 12 as the locking means. .

For the rotation preventing device 17, any means other than the method of inserting a pin 19 from the table 16 into the vehicle body 1 as in the first and second embodiments can be adopted. For example, as shown in FIG. 4, the fact that the ladder 3 of the aerial work vehicle is locked to the ladder receiver 7 can be used as a device to prevent the ladder receiver 7 from rotating.

Furthermore, it is also possible to correct the inclination by installing a tilt detection means on the table and automatically controlling the driving device and the fixing device using the electric signal from the tilt detection means.

Effects of the Invention According to the present invention, when an aerial work vehicle is stopped on a slope or the like, a table on which a working machine such as a ladder is attached can be straightened horizontally without straightening the vehicle body horizontally using an outrigger. Can be done.
In addition, in the device of the present invention, since the table itself is corrected horizontally, the direction of the work machine such as a ladder is This eliminates the irrationality of having to correct your posture every time you change your posture.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of an embodiment of the present invention;
2 is a sectional view taken along the line A-A in FIG. 1, FIG. 3 is a sectional view showing the device shown in FIG. 1 in a state where the tilt correction operation is performed, and FIG. 4 is a sectional view to which the present invention is applied. It is a sectional view showing an example of an aerial work vehicle. 1...Vehicle body, 2...Swivel base with tilt correction, 8...
First ring, 10... Second ring, 11... First rolling bearing, 12... Third ring, 13... Second rolling bearing, 14... Fourth ring, 15... Third rolling bearing, 16...table, 17...device for preventing rotation, 21...first fixing device, 24...second fixing device, 27...first drive device, 33...
...Second driving device.

Claims (1)

[Claims] 1 A first ring fixed to the vehicle body at the turning center of the aerial work vehicle, a second ring rotatably supported by the first ring via a first rolling bearing, and the second ring. a third ring rotatably supported on the third ring via a second rolling bearing having an axis obliquely intersecting with the axis of the first rolling bearing; It has an axis that is oblique to the axis of the rolling bearing and is rotatable via a third rolling bearing that is in a position parallel to the first rolling bearing when the tilt correction operation is not performed. a fourth ring supported on the fourth ring; a table fixed on the fourth ring; a device for preventing the table from rotating with respect to the vehicle body; The first step is to fix the wheels so that they do not rotate relative to each other.
a second fixing device that fixes the second ring and the third ring so that they do not rotate relative to each other; and a first fixing device that fixes the first ring and the second ring so that they do not rotate relative to each other. 1. A swivel base with tilt correction for an aerial work vehicle, comprising: a drive device; and a second drive device that rotates the table and a third wheel relative to each other.