JPH0124077Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an aerial work vehicle with a secondary boom.

What is shown in Fig. 1 is a traveling base A, a swivel base B that is rotatably mounted on the travel base A, and a telescoping base whose base end is pivoted to the swivel base B so that it can be raised and lowered. A main boom C, a support base D provided at the tip of the main boom C so as to be adjustable in elevation, a bucket E for boarding an operator that is rotatably arranged with respect to the support base D, and a bucket E for boarding the operator. The sub-boom F is installed on the top of the support base so that simple cargo handling work can be carried out inside the sub-boom F.
This is an aerial work vehicle consisting of a secondary boom holder G that supports the boom so that it can be rotated, raised and pulled out. This support base D is divided into an upper part and a lower part, and the upper part that supports the sub-boom holder G can be rotated around a vertical axis with respect to the lower part by a hydraulic device (not shown) or by manual operation. There is.

In this aerial work vehicle, the sub-boom F is
The sub-boom holder G can be raised and lowered around a lifting fulcrum 1 provided on the sub-boom holder G, and when the operator raises and lowers the sub-boom F, the operator supports the sub-boom F by hand and lifts the sub-boom F by a desired amount. It was necessary to raise and lower the sub-boom F and fix the lock pin 2 by fitting it into one pin hole 3 selected from a plurality of pin holes 3 provided therein.

Therefore, in order to smoothly perform manual hoisting of the sub-boom F, it is necessary to optimize the weight distribution around one hoisting fulcrum and reduce the hoisting operation force of the sub-boom.

However, as shown in Fig. 2, the conventional type has a hook 4 suspended from the tip of the sub-boom
Winch drum 5 that winds up the rope supporting the
and a drum drive device H consisting of a worm reducer 6 and a hydraulic motor 7 that drive the winch drum 5.
was attached to the sub-boom holder G above the sub-boom F. Therefore, the winch drum 5 is installed at an upper position where the worm reducer 6 does not interfere with the sub-boom F, and these winch drums 5 are The arm length of the manual hoisting moment up to the drum drive device H becomes large, and the hoisting operation force of the sub-boom F increases as the hoisting angle of the sub-boom F increases, causing pain to the operator. Furthermore, since this work was performed inside the bucket E, there was a problem in that it was not desirable from a safety standpoint.

Therefore, in order to avoid this problem, as shown in FIG. 3, a pulley 8 is provided at the base end of the sub-boom F, a pulley 9 is provided at the sub-boom holder G, and a rope 10 for suspending the hook 4 is provided. In some cases, the winding and unwinding is controlled by a winch drum (not shown) provided at the tip of the main boom C or on the support base after the winding is sequentially passed around the pulleys 8 and 9. In this case, the sub-boom holder G is not equipped with a winch drum and a drum drive device, which are heavy objects, so that the force required to operate the sub-boom F for raising and lowering is reduced, and the operation is simplified. There were problems in that the mechanism related to the driving operation of the winch drum became complicated and the rope winding force was reduced due to pulley resistance.

In view of the above-mentioned problems that the conventional ones had, the present invention reduces the lifting operation force of the sub-boom as much as possible,
Moreover, it is an object of the present invention to provide a novel aerial work vehicle with a sub-boom that has a simple structure and does not reduce rope winding force.

In order to achieve the above object, the present invention is constructed as follows.

That is, a support base is provided at the tip of the main boom so that it can be raised and lowered freely, a bucket for boarding the operator and a sub-boom holder are installed on this support base, and a sub-boom that can be manually pulled out is installed in the center of the sub-boom holder. At the same time, a winch drum driven by a hydraulic motor to wind up a rope suspended from the tip of the sub-boom is disposed on the upper part of the sub-boom holder, and a winch drum is disposed on the upper part of the sub-boom holder, and a winch drum is disposed on the upper part of the sub-boom holder and winds up a rope suspended from the tip of the sub-boom. In the above-mentioned aerial work vehicle with a sub-boom, the sub-boom is provided with a hoisting fulcrum for supporting the sub-boom holder in a freely hoistable manner between the upper part of the base and a coupling device for fixedly supporting the sub-boom at a desired hoisting angle. The winch drum is configured to transmit rotation of a hydraulic motor for driving the winch drum to the winch drum via a worm reduction gear and a spur gear reduction mechanism, and the worm reduction gear and the hydraulic motor are biased near the uphill support point. An aerial work vehicle with a sub-boom, characterized in that the manual hoisting force around the hoisting fulcrum of the sub-boom is reduced as much as possible.

The present invention configured as described above has a spur gear reduction mechanism interposed between the worm reducer and the winch drum, so that the worm reducer can be installed at an offset position with respect to the winch drum. Moreover, by setting the offset direction toward the hoisting fulcrum, the heavy worm reducer and hydraulic motor can be located near the hoisting fulcrum, reducing the manual hoisting moment of the sub-boom and making it easier to perform hoisting operations. This results in a sub-boom that requires less force and has good workability. In addition, in this invention, the winch drum is attached to the sub-boom holder above the sub-boom, so
This eliminates the need for a pulley to guide the rope between the winch drum and the pulley provided at the tip of the sub-boom, and eliminates the problem of reduced rope winding force due to pulley resistance.

Next, the present invention will be explained in detail based on a specific example.

11 is a hydraulic motor for driving the winch drum. Reference numeral 12 indicates a worm that rotates with the rotation of the hydraulic motor 11, and reference numeral 13 indicates a worm wheel that is rotationally driven by the worm 12. The worm 12 and the worm wheel 13 form a worm speed reducer W. The worm reducer W and the hydraulic motor 11 are incorporated into a common casing and are integrally connected to the sub-boom holder G near the up-and-down fulcrum located below the sub-boom F via a connector 14. 15 is a first spur gear that rotates together with the worm wheel 13 via the output shaft 16. Reference numeral 17 denotes a second spur gear integrally connected to the winch drum 5 which is rotatably supported by the sub-boom holder G on the upper side of the sub-boom F, and is engaged with the first spur gear 15 to drive the winch drum 5. In addition to transmitting force, the worm reducer W is configured to be installed at a position offset from the winch drum 5 (this first spur gear 1
5 and the second spur gear 17 constitute a spur gear reduction mechanism). Therefore, when the hydraulic motor 11 is driven to rotate, the rotational motion of the hydraulic motor 11 is transmitted to the winch drum 5 via the worm reducer W, the first spur gear 15, and the second spur gear 17. Although not shown, the operating section of the hydraulic motor 11 is provided at a location where it can be easily operated from the bucket E. 18 is
It is a plurality of holes drilled in the sub-boom holder G,
This hole 18 is integrally connected with a hole 19 drilled in the support base D via a connector 20, and supports the sub-boom F in a fixed manner at a desired up-and-down angle.

With the above configuration, although the structure is simple and the manual hoisting type sub-boom does not reduce the rope winding force due to pulley resistance, the sub-boom can be easily hoisted by optimizing the weight balance of the sub-boom holder. This makes it possible to provide an aerial work vehicle with a secondary boom that reduces force and has good workability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of an aerial work vehicle with a sub-boom, Figs. 2 and 3 are explanatory diagrams of a conventional sub-boom section, and Fig. 4 is an explanatory diagram of a sub-boom section showing one embodiment of the present invention. , FIG. 5 is an explanatory view taken in the direction of arrow H in FIG. 4. C...Main boom, D...Support base, E...Bucket,
G... Sub-boom holder, F... Sub-boom, 5... Winch drum, 1... Hoisting fulcrum, 11... Hydraulic motor, W
...worm reducer, 15...first spur gear, 17...second spur gear.

Claims (1)

[Scope of utility model registration request] A support base is provided at the tip of the main boom so that it can be raised and lowered freely, and a bucket for boarding the operator and a sub-boom holder are installed on this support base, and the sub-boom is arranged in the center of the sub-boom holder so that it can be pulled out manually. At the same time, a winch drum driven by a hydraulic motor to wind up a rope suspended from the tip of the sub-boom is disposed on the upper part of the sub-boom holder, and a winch drum is disposed on the top of the sub-boom holder, and a winch drum is disposed on the top of the sub-boom holder, and a winch drum is installed on the top of the sub-boom holder to wind up a rope suspended from the tip of the sub-boom. In the above-mentioned aerial work vehicle with a sub-boom, the above-mentioned winch drum is provided with a sub-boom-equipped aerial work vehicle, in which a hoisting fulcrum for supporting the sub-boom holder in a freely hoistable manner and a connecting device for fixedly supporting the sub-boom at a desired hoisting angle are disposed between the upper part of the sub-boom holder. The rotation of a hydraulic motor for driving is configured to be transmitted to the winch drum via a worm reducer and a spur gear reduction mechanism, and the worm reducer and hydraulic motor are mounted in the vicinity of the fulcrum supporting point, An aerial work vehicle with a sub-boom, characterized in that manual hoisting force around the hoisting fulcrum of the sub-boom is reduced as much as possible.