JPH0532398A - Apparatus for use both as crane work and as high place work - Google Patents

Abstract

PURPOSE:To keep horizontal an attachable and detachable work floor of an apparatus for use both as crane work and as high place work when a boom rises and falls. CONSTITUTION:A step-up gear 11 which is driven by rise and fall of a telescopic boom 8, is set at the base edge of the boom 8 which can rise and fall of a crane apparatus. A reduction gear 12 whose speed reduction ratio is the inverse of speed increasing ratio of the step-up gear 11, is set at the front edge of the boom 8. A telescopic transmission rod 13 which expands and contracts with expansion and contraction of the boom 8, and transmits rotation of the step-up gear 11 to the reduction gear 12, is set between the reduction gear 12 and the step-up gear 11. And also a support seat 52 which can attach and detach a work floor 15 is pivotally supported at the front edge of the boom 8, and a transmission mechanism 17 which transmits rotation of the reduction gear 12 to the support seat 52 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combined device for crane work and aerial work, which has a detachable work floor and a horizontal holding mechanism for the work floor and is capable of performing aerial work in addition to crane work. .

[0002]

2. Description of the Related Art Generally, a crane device is used for crane work such as lifting a load, and an aerial work device is used for aerial work, but it is also possible to use a boom of the crane device for aerial work. If this is done, it is convenient for work, and the equipment cost can be reduced. Therefore, a combined device for crane work and aerial work, in which a detachable work floor for aerial work is attached to the tip of the crane boom, has been proposed (Jitsuko Sho 54).
-21443, Jitsuko 54-27761, Jitsuko 5
4-34362, etc.).

[0003]

In an aerial work-only device having a work floor at the tip of a boom to be undulated, the work floor does not need to be attached or detached, so that it is automatically kept horizontal according to the undulation of the boom. There was a mechanism (Jitsuko Sho 40-75)
69, Jikkou Sho 43-7588, etc.). However, since the above-described device for both crane work and work at high altitudes has a removable work floor, the work floor and the occupant's own weight keep the work floor horizontal when the boom is raised and lowered. The work floor is fixed to the boom during work. Therefore, when the boom is raised and lowered, the work floor swings due to the movement of the boom and the wind, and when the boom is raised and lowered by mistake during work, the work floor is inclined, which is dangerous.

The present invention solves such a problem in a combined device for crane work and work at high places. Thus, the present invention is a combined device for crane work and aerial work in which a detachable work floor for aerial work is attached to the tip of the crane boom, and the work floor is automatically operated according to the ups and downs of the boom. It is an object of the present invention to provide a combined device for crane work and aerial work that can maintain the horizontal level of the work and safely perform aerial work.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a crane device having a boom capable of expanding and contracting and hoisting is provided with a speed increaser driven by hoisting of the boom at the base end of the boom, and the deceleration at the tip of the boom. A speed reducer whose ratio is the reciprocal of the speed increase ratio of the speed increaser is installed, and the output side of the speed increaser is rotated at the input side of the speed reducer by expanding and contracting as the boom expands and contracts between the speed reducer and the speed increaser. The above-mentioned problem is achieved by providing a telescopic transmission rod for transmitting the rotation of the work floor to the tip of the boom and a transmission mechanism for transmitting the rotation of the output side of the reduction gear to the reception seat. Has been resolved.

[0006]

When working at a high place, the work floor is attached to the seat and the boom is raised and lowered and extended to move the work floor to the work position. When the boom undulates, the gearbox is given a rotation in the opposite direction of the boom undulation, and this rotation is accelerated.
It is transmitted to the speed reducer via the expansion transmission rod. This rotation is decelerated by the speed reducer and transmitted to the seat through the transmission mechanism.
Here, since the speed reduction ratio of the speed reducer is the reciprocal of the speed increase ratio of the speed increaser, the work floor is rotated at a constant angular velocity in the direction opposite to the boom undulation, and is kept horizontal. Even if the extension / contraction operation is performed at the same time as the undulation, the extension / contraction transmission rod expands / contracts as the boom expands / contracts, so that there is no obstacle to rotation transmission.

When performing a crane work, the work floor can be used in the same manner as a normal crane device by removing the work floor from the seat.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view showing a working state at a high position of a combined device for crane work and aerial work according to an embodiment of the present invention. In this embodiment, the combined work device 1 for crane work and work at high places is equipped with a cab 3 at the front part of the chassis frame 2 and a cargo bed 4 at the rear part thereof, and can be self-propelled by wheels 5. An outrigger 6 and a swivelable column 7 are provided between the cab 3 and the bed 4. At the upper end of the column 7, the base end of the extendable boom 8 is the foot pin 9
A hoisting cylinder 10 is mounted between the column 7 and the boom 8.

A speed increaser 11 is provided at the base end of the boom 8 and a speed reducer 12 is provided at the front end of the boom 8.
A telescopic transmission rod 13 is connected between 1 and the speed reducer 12. A receiving seat 52 is pivotally supported at the tip of the boom 8, and the working floor 15 is attached to the receiving seat 52.
A transmission mechanism 17 is provided between the speed reducer 12 and the pivot 16 of the seat 52.
Is provided.

The speed increasing gear 11 is a worm type speed increasing gear. As shown in FIGS. 2 and 3, a worm 21 and a worm wheel 22 are provided in a casing 20, and the casing 20 of the speed increasing gear 11 is provided. Is fixed to a step-up gear fixing bracket 25 protruding from the side of the base end portion of the boom 8, and the worm wheel shaft 23 is connected and fixed to the foot pin 9. Therefore, assuming that the speed increasing ratio of the speed increaser 11 is I ₁ , if the boom 8 is undulated by the angle θ, the worm wheel 22
Rotates with respect to the casing 20 in the direction opposite to the ups and downs of the boom 8 by an angle θ, and the worm shaft 24 is rotated by θ × I ₁ .

The speed reducer 12 is a worm type speed reducer. As shown in FIGS. 4 and 5, a worm 31 and a worm wheel 32 are provided in a casing 30, and the casing 30 of the speed reducer 12 is a boom 8. Is fixed to a speed reducer mounting bracket 35 provided on the side of the tip end portion of. Here, the speed reduction ratio I ₂ of the speed reducer 12 is the speed increase ratio I _{1 of the} speed increaser 11.
Is the reciprocal of, that is, I ₂ = 1 / I ₁ . The telescopic transmission rod 13 provided between the worm shaft 34 of the speed reducer 12 and the worm shaft 24 of the speed increaser 11 is shown in FIGS.
As shown in FIG. 4, the number of the square pipes 41 corresponding to the number of stages of the boom 8 is sequentially telescopically fitted, and the flange 40 provided at the front end of each square pipe 41 is attached to the side surface of the boom 8. It is rotatably supported by a bracket 42. This telescopic transmission rod 13 has its base end connected to the worm shaft 24 of the speed increaser 11 and its front end connected to the worm shaft 34 of the speed reducer 12, and expands and contracts as the boom 8 expands and contracts. Moreover, the rotation of the worm shaft 24 of the speed increaser 11 can be transmitted to the worm shaft 34 of the speed reducer 12.

As shown in FIGS. 4 and 8, a pivot shaft 16 is pivotally supported at the tip of the boom 8 by bearings 51. At both ends of the pivot shaft 16, there are seats 52 for attaching and detaching the work floor 15.
Is fixed. In this embodiment, the pivot 16 also serves as the pivot of the crane hook hanging pulley 70. The seat 52 has a prismatic shape and has a pin hole 53 formed in the front surface. A parallel link 54 is connected as a transmission mechanism 17 between the pivot 16 and the worm wheel shaft 33 of the reduction gear 12, and the rotation of the worm wheel shaft 33 is transmitted to the seat 52.

The work floor 15 has a frame 55 as shown in FIG.
A crown-shaped mounting seat 56 is provided on the upper side surface of the, and a pin 57 for inserting into the pin hole 53 of the receiving seat 52 is provided at the lower part thereof. As shown in FIGS. 10, 11 and 12, the pin 57 is biased toward the receiving seat 52 by a spring 58, the mounting seat 56 is placed on the receiving seat 52, and the pin 57 is inserted into the pin hole 53. The work floor 15 is connected and fixed by being inserted. When detaching, the pin 57 is pulled out by the handle 59 at the rear end and rotated, and is held at the position pulled out by the retainer 60.

When performing work at a high place, the work floor 15 is attached to the receiving seat 52, and the boom 8 is moved up and down and extended to move the work floor 15 to the work position. When the boom 8 undulates by an angle θ, the worm wheel 22 of the speed increaser 11 is rotated by an angle θ in the direction opposite to the undulation of the boom 8, and this rotation is accelerated to cause the worm shaft 24 to rotate by θ × I ₁ Is transmitted to the worm shaft 34 of the speed reducer 12 via the expansion and contraction transmission rod 13. This rotation is decelerated by the speed reducer 12 and transmitted from the worm wheel shaft 33 to the seat 52 via the parallel link 54. Here, since the reduction ratio I ₂ of the speed reducer 12 is the reciprocal of the speed increase ratio I ₁ of the speed increaser 11, the work floor 15 is in the opposite direction to the undulation of the boom 8 by θ × I ₁ × I ₂ That is, the rotation of the angle θ is given, and the horizontality is maintained. Even if the extension / contraction operation is performed simultaneously with the ups and downs, since the extension / contraction transmission rod 13 extends / contracts as the boom 8 extends / contracts, the rotation transmission is not hindered.

Since the worm type speed increaser and speed reducer have a characteristic that the worm cannot be driven from the worm wheel side when the worm advance angle is set small.
In this embodiment, the lead angle of the worm 21 of the speed increaser 11 is set large and the lead angle of the worm 31 of the speed reducer 12 is set small. Therefore, even if a collision or the like occurs during the work and a rotational force is applied to the work floor 15 from the outside, the worm shaft 34 does not rotate due to the self-locking mechanism of the worm 31 of the speed reducer 12, and the work floor 15 remains at the same position. Retained.

When carrying out crane work, the work floor 15
If it is removed from the seat 52, it can be used like a normal crane device. In this embodiment, a worm type gear is used as the speed increasing gear and the speed reducing gear, but a bevel gear, a spiral gear or the like may be used. Also,
Although a square pipe is used for the expansion and contraction transmission rod 13, other means such as a spline may be used as long as it can expand and contract and can transmit rotation. Means other than the parallel link can be used for the transmission mechanism.

[0017]

As described above, the combined device for crane work and work in high places according to the present invention allows the work floor for work in high places to be easily attached to and detached from the tip of the crane boom to perform work in high places. In this case, the work floor can be automatically kept horizontal according to the ups and downs of the boom, and work at high altitude can be performed safely.

[Brief description of drawings]

FIG. 1 is a side view showing a state of work in a high place according to an embodiment of the present invention.

FIG. 2 is a side view showing a mounted state of the speed increaser.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a side view showing a mounted state of the speed reducer.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a partial cross-sectional view of a telescopic transmission rod.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a front view of a boom tip portion showing a part of a pivot in cross section.

FIG. 9 is a side view showing a mounting state of a work floor.

FIG. 10 is a side view showing the inserted state of the pin.

FIG. 11 is a side view showing a pin withdrawn state.

FIG. 12 is a front view showing a pin withdrawn state.

[Explanation of symbols]

1 Crane work and work at high places 7 columns 8 boom 9 foot pins 10 Lifting cylinder 11 speed increaser 12 reducer 13 Telescopic transmission rod 15 Working floor 16 Axis 17 Transmission mechanism 52 seat

Claims (2)

[Claims] 1. A crane apparatus having a boom capable of expanding and contracting and hoisting, wherein a speed increaser driven by hoisting of the boom is provided at a base end portion of the boom, and a reduction ratio is provided at a tip end portion of the boom. A speed reducer that is the reciprocal of the speed increase ratio of the speed increaser is provided, and the output side rotation of the speed increaser is input to the speed reducer by expanding and contracting with the expansion and contraction of the boom between the speed reducer and the speed increaser. And a transmission mechanism for transmitting the rotation on the output side of the speed reducer to the receiving seat. Combined device for crane work and high place work, which is characterized. 2. The combined device for crane work and work in high places according to claim 1, wherein the speed reducer has a self-locking mechanism.