JP2508113Y2 - Lifting device for aerial work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a hoisting device for an aerial work vehicle.

(Prior Art) As shown in FIG. 5, in an aerial work vehicle, a boom 3 is mounted on a swivel base 2 mounted on a vehicle 1 so that the boom 3 can be lifted and lowered, and a vertical posture is always maintained at the tip of the boom 3. A bucket 5 is attached to an upright vertical support shaft 4 so as to be horizontally rotatable. This type of aerial work vehicle is provided for the purpose of handling heavy objects by workers on a bucket.
The lifting device A, that is, the swing frame 6 horizontally swingably attached to the upper end of the vertical support shaft 4, and an appropriate fixing means 11 that is attached to the swing frame 6 so as to be up and down (in this example, the swing frame 6 side and Pin holes provided on the jib support frame 7 respectively,
A jib supporting frame 7 that can be fixed to a plurality of up-and-down positions by means of pins that are inserted and connected through these pin holes, a jib 8 that is extendably attached to the jib supporting frame 7, and a jib that is suspended from the tip of the jib. A hoisting device A including a winch device 10 having a winch drum 10a for hoisting and lowering the lowered rope 9 is provided.

By the way, in the conventional hoisting device A, as shown in FIG. 5, the undulating fulcrum 7a of the jib support frame 7 to which the winch device 10 is attached is arranged at a position lower than the position of the support shaft 10b of the winch drum 10a in the winch device 10. Then configured.
Therefore, in the conventional lifting device A, the winch device 10 largely moves back and forth when the jib 8 is raised and lowered.
There was a problem that the substantially exclusive space of 10 became large and the lifting device was bulky.

In addition, a large moment is generated around the undulation fulcrum 7a due to the weight of the winch device 10, and therefore a large amount of labor is required to change the undulation angle of the jib 8 by releasing the fixation of the fixing means 11 between the swivel frame 6 and the jib support frame 7. There was a problem that needed.

It should be noted that the latter problem can be solved by mounting the winch device 10 on the swivel frame 6 side so that the winch drum 10a portion does not interfere with the undulating fulcrum 7a. Since the winch device 10 is arranged apart from the undulating fulcrum 7a, the winch device 10
However, the former problem that the exclusive space becomes large and the lifting device becomes bulky cannot be solved.

This invention intends to provide a compact lifting device that solves the above-mentioned problems of the prior art.

(Means for Solving the Problems) In order to achieve the above object, the hoisting device for an aerial work vehicle according to the present invention is provided with a winch device 10 and an axial center of an undulating fulcrum 7a of a jib support frame 7 with respect to a swivel frame 6. Winch drum
The winch device 10 is attached to the swivel frame 6 or the jib support frame 7 so that the axis of the support shaft 10b of 10a is located on the same line.

(Operation) With such a configuration, the separation distance between the winch drum 10a of the winch device 10 and the undulating fulcrum 7a can be eliminated, and a compact lifting device can be provided.

Moreover, with such a configuration, even if the winch device 10 is arranged on the jib support frame 7 side as in the conventional case, the moment generated around the undulating fulcrum 7a due to the weight of the winch device 10 becomes extremely small, so that the jib 8 It requires less effort during the undulating operation.

(Embodiment) An embodiment of the lifting device for an aerial work vehicle of the present invention will be described below with reference to FIGS. 1 to 4.

The hoisting device for an aerial work vehicle of the present invention has a different position of the winch device 10 as compared with the conventional device. Therefore, the reference numerals used in the conventional example shown in FIG. Will be used as is.

In FIGS. 1 and 2, the lifting device A is, similarly to the conventional device, a swivel frame 6 which is horizontally swingably attached to an upper end portion of a vertical support shaft 4, and a hoisting device 6 is swingably mounted and appropriately fixed. A winch drum for hoisting and hoisting a jib support frame 7 that can be fixed to a plurality of undulating positions by means, a jib 8 that is elastically attached to the jib support frame 7, and a rope 9 that is hung from the tip of the jib 8. The winch device 10 is provided with 10a.

The jib support frame 7 is composed of a jib fitting insertion portion 7b into which the jib 8 is elastically fitted and a pair of left and right brackets 7c and 7d extending downward from the jib fitting insertion portion 7b. The bracket 7c has a U-shaped cutout at the tip thereof. Further, a large diameter hole is provided at the tip of the bracket 7d.

In the winch device 10, the winch drum 10a is positioned between the pair of left and right brackets 7c and 7d, and both ends thereof are fixed to the pair of left and right brackets 7c and 7d, respectively. In this fixing, a bearing 10c rotatably fitted on a support shaft 10b protruding to one side of the winch drum 10a is fitted and fixed in the U-shaped notch of the bracket 7c, and at the other side of the winch drum 10a. The drive actuator case 10d located in the bracket 7d is inserted and fixed in a large-diameter hole of the bracket 7d.

The swivel frame 6 is composed of a base portion 6a that is fitted onto the upper end portion of the vertical support shaft 4 so as to be horizontally swivelable, and a pair of left and right brackets 6b and 6c extending upward from the base portion 6a. The bracket 6b is rotatably fitted on the bearing 10c, and the bracket 6c is rotatably fitted on an annular shaft 7e projecting on the side surface of the bracket 7d of the jib support frame 7 so as to surround the actuator case 10d. It is fitted and attached. In this way, the axis of the undulating fulcrum 7a of the jib support frame 7 with respect to the swivel frame 6 and the axis of the fulcrum 10b of the winch drum 10a in the winch device 10 are located on the same line.

Although the winch device 10 is attached to the jib support frame 7 in the above embodiment, the winch device 10 may be attached to the swivel frame 6 as shown in FIGS. Is.

In any case, the hoisting device for an aerial work vehicle according to the present invention has an axis center of the undulating fulcrum 7a of the jib support frame 7 with respect to the swivel frame 6 and the spindle 1 of the winch drum 10a in the winch device 10.
The winch device 10 so that the 0b axis is located on the same line.
Is attached to the swivel frame 6 or the jib support frame 7, the distance between the winch drum 10a of the winch device 10 and the undulating fulcrum 7a can be eliminated, and a compact lifting device can be provided.

Moreover, with such a configuration, even if the winch device 10 is arranged on the jib support frame 7 side as in the conventional case, the moment generated around the undulating fulcrum 7a due to the weight of the winch device 10 becomes extremely small, so that the jib 8 It requires less effort during the undulating operation.

Further, since the winch device 10 is located between the brackets 7c and 7d below the fitting portion 7b of the jib support frame 7 as in the above embodiment, the winch device 10 is physically protected from the outside. It also has the effect of being performed. With such a configuration, when the winch device 10, the jib support frame 7, and the swing frame 6 are covered with an electric insulating material (this means that an electric work is performed by an aerial work vehicle equipped with the lifting device). (This is necessary at the time), and because the objects to be covered are compact, it has the effect of simplifying the cover work.

(Effect) The lifting device for an aerial work vehicle of the present invention configured and operated as described above can achieve the initial purpose with an extremely simple structure, and is therefore practically effective.

[Brief description of drawings]

1 and 2 are explanatory views of an embodiment of a hoisting device for an aerial work vehicle according to the present invention. FIG. 1 is a side view of the hoisting device, and FIG. 2 is X- of FIG. It is an X sectional view. 3 to 4 are explanatory views of another embodiment of the hoisting device for an aerial work vehicle according to the present invention. FIG. 3 is a side view of the hoisting device, and FIG. 4 is shown in FIG. It is a YY sectional view. FIG. 5 is an explanatory view of a conventional lifting device for an aerial work vehicle. Boom; 3, vertical support shaft; 4, bucket; 5, swivel frame; 6, jib support frame; 7, jib; 8, rope; 9, winch device; 10, winch drum; 10a, spindle; 10b, fixing means 11, lifting device;
A,

Claims (1)

(57) [Scope of utility model registration request] 1. A hoisting device for an aerial work vehicle in which a bucket is attached to a vertical support shaft standing upright at a tip of a boom while always maintaining a vertical posture, and in particular, it is horizontal to an upper end portion of the vertical support shaft. A swivel frame that is swivelably mounted, a jib support frame that is swung up and down on the swivel frame and can be fixed to a plurality of up and down positions by appropriate fixing means, a jib that is telescopically mounted on the jib support frame, and the jib A winch device including a winch drum for hoisting and hoisting a rope suspended from a tip end portion, and an axis center of an undulating fulcrum of a jib support frame with respect to the swivel frame and a spindle shaft of a winch drum in the winch device. A hoisting device for an aerial work vehicle, wherein the winch device is attached to a swivel frame or a jib support frame so that the hearts are located on the same line.