JPH0645986U - Knuckle boom device - Google Patents

Abstract

(57) [Summary] [Purpose] To make the knuckle boom device compact in height when stored. [Constitution] The present knuckle boom device 20 is provided with a hoisting boom 23 which is attached to a base 12 so as to be hoisted and a tip end portion of the hoisting boom 23 so that both side surfaces of the tip end portion are sandwiched inward. And a connecting member 24 attached so as to be swingable in the direction. A parallel link parallel to the undulating boom 23 is provided above the tip end mounting position 24a of the undulating boom 23 on the outer side of one side of the connecting member 24 and between the pedestal 12 and the base end mounting position 24a of the undulating boom 23. The member 25 is attached. In addition, the connecting member 24
Tip end mounting position 24a of the undulating boom 23 inside the
A bending / bending boom 26 is attached above and above the bending boom 26 so that the bending boom 26 can be bent and extended freely. Guide means 27 for guiding a hydraulic pipe or an electric cable 29 is provided on the outside of the side surface of the bending / bending boom 26 opposite to the side where the parallel link member 25 is arranged.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a knuckle boom device used for an aerial work vehicle or the like.

[0002]

[Prior art]

 As shown in FIG. 3, a conventional knuckle boom device 30 includes a hoisting boom 33 that is movably mounted on a vehicle body (base) 31, and a tip end portion of the hoisting boom 33 on both side surfaces of the tip end portion. And a connecting member 34 that is arranged so as to be sandwiched inward and is swingably mounted in the vertical direction, and below the mounting position 34a of the tip end portion of the undulating boom 33 on one side or both side surfaces of the connecting member 34. A parallel link member 35 attached so as to extend in parallel with the undulating boom 33 is provided below the attachment position 31a of the base end portion of the undulating boom 33 in the vehicle body 31. The horizontal link member 35 keeps the connecting member 34 in a vertical posture regardless of the up-and-down state of the up-and-down boom 33.

A bending / extending boom 36 is attached to the inside of the connecting member 34 above the attaching position 34a of the tip end portion of the hoisting boom 33 so as to be able to flex and extend vertically with respect to the hoisting boom 33. Further, a guide means 37 is attached to the outer side of one side surface of the bending and stretching boom 36. The guide means 37 guides the hydraulic hose / electric cable 39 extending from the vehicle body 31 side to the workbench 38 horizontally held at the tip of the bending boom 36, and the hoisting boom 33 and the bending boom 36 are guided from above the workbench 38. It is possible to control the operation of the above, or to use a hydraulic tool or an electric tool on the workbench 38.

In an aerial work vehicle including the knuckle boom device 30 configured as described above, an operator rides on a workbench 38 and appropriately operates the undulating boom 33 and the bending boom 36 of the knuckle boom device 30. This allows you to move to any height and work on it.

[0005]

[Problems to be solved by the device]

 However, in such a knuckle boom device 30, as shown by the chain line in the figure, when retracted to the vehicle body 31, the parallel link member 35 allows the hoisting boom 33 to fall to the bare upper surface of the vehicle body 31. Can not. For this reason, there is a problem that the vehicle height H ′ of the entire work platform for high places becomes high when the knuckle boom device 30 is stored.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a knuckle boom device in which the size in the height direction during storage can be made as compact as possible.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the knuckle boom device of the present invention comprises a hoisting boom that is undulatingly mounted on a base and a tip portion of the hoisting boom so that both sides of the tip portion are sandwiched inside. And a connecting member that is attached so as to be swingable in the vertical direction. Between the mounting position of the tip of the undulating boom on the outer side of one side of this connecting member and the position of the base end of the undulating boom on the base, it is parallel to extend parallel to the undulating boom. A link member is attached. Further, above the mounting position of the tip end portion of the undulating boom inside the connecting member, a bending / bending boom is attached to the undulating boom so as to be able to bend and extend vertically. A guide means for guiding hydraulic pipes or electric cables extending from the base side to the tip of the bending boom is provided outside the side surface of the bending boom that is opposite to the side where the parallel link members are arranged.

[0008]

[Action]

 In such a knuckle boom device, since the parallel link member is arranged above the hoisting boom, the hoisting boom can be laid down to a position just barely above the upper surface of the base. As a result, the connecting member can also be lowered to a considerably lower position with respect to the base. Further, since the parallel link member and the guide means are arranged on the opposite sides of the boom, the bending and stretching boom can be stored immediately above the hoisting boom without interfering with each other. . Therefore, the size of the entire knuckle boom device in the height direction when stored can be kept compact.

[0009]

【Example】

 Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an aerial work vehicle 10 equipped with a knuckle boom device according to the present invention. This aerial work vehicle 10 is provided with a swivel base 12 which is freely rotatable horizontally above the lower traveling device 11. The knuckle boom device 20 is attached to the upper part of the swivel base 12.

The knuckle boom device 20 is configured to have a hoisting boom 23 which is mounted inside the side plates 12r and 12l of the swivel base 12 so as to be hoistable. A connecting member 24, which is arranged so as to sandwich the side surface of the tip end portion inward, is attached to the tip end portion of the hoisting boom 23 so as to be vertically swingable at its lower portion. The tip end of the parallel link member 25 swings in the vertical direction above the attachment position 24a of the tip end portion of the hoisting boom 23 on the outside of the front side surface (hereinafter referred to as the right side surface) of the connecting member 24 in the figure. It is pivotally attached. The parallel link member 25 extends in parallel with the hoisting boom 23, and its base end portion is hoisted to a position higher than the base end mounting position 12a of the hoisting boom 23 outside the right side plate 12r of the swivel 12. It is freely pivoted. Therefore, even if the hoisting boom 23 is hoisted by the expansion and contraction operation of the hydraulic hoisting cylinder 23a attached between the hoisting boom 23 and the swivel base 23, the connecting member 24 is held in a predetermined posture (here, the vertical posture).

Further, a bending boom 26 is attached to the inside of the upper portion of the connecting member 24 so as to be able to bend and expand in the vertical direction. The bending / extending operation of the bending / bending boom 26 is performed by the expansion / contraction operation of the hydraulic bending / expanding cylinder 26a attached between the bending boom / extension boom 26 and the connecting member 24. Further, the bending / bending boom 26 is configured to be telescopically expandable and contractable, and a workbench 28 is attached to the tip end thereof. The workbench 28 is held horizontally by a leveling device (not shown) regardless of the bending / extending posture of the bending / extending boom 26.

Further, on the outside of the side surface of the bending / extending boom 26 on the side facing in the figure (side surface opposite to the side where the parallel link member 25 is arranged: hereinafter referred to as left side surface), there is a slight gap between the side surface and the left side surface. A hose guide 27 is attached so as to extend in parallel with the bending boom 26 (see FIG. 2A). The hose guide 27 is configured to telescopically expand and contract as the bending boom 26 extends and contracts, and a hydraulic hose 29 extending from the swivel base 12 is extended inside the hose guide 27 in the vicinity of the work table 28. I will guide you to. For this reason, an operator on the workbench 28 can appropriately control the operations of the hoisting boom 23 and the bending boom 26 to move to an arbitrary height. The desired work can be performed using the hydraulic pressure supplied to the workbench 28 via the hydraulic hose 29.

By the way, the knuckle boom device 20 configured as described above is stored in the lower traveling device 11 and the swivel base 12 as shown by a chain line in the drawing. Here, since the parallel link member 25 is disposed above the hoisting boom 23, the hoisting boom 23 can be hoisted up to a position where the hoisting cylinder 23a interferes with the upper surface of the swivel base 12 to the last position. As a result, the tips of the hoisting boom 23 and the parallel link member 25 are lowered to a position lower than the upper surface of the swivel base 12. Therefore, the position of the connecting member 24 can also be lowered, and its upper end is substantially equal to the upper ends of the side plates 12r and 12l of the swivel base 12.

The flexion-bending / extending boom 26 is stored substantially horizontally just above the hoisting boom 23 in the collapsed storage state. The stored bending / extending boom 26 is housed between the left and right side plates 12l, 12r of the swivel 12, as shown in FIG. 2 (B). At this time, the lower surface of the bending / bending boom 26 is lowered to a position lower than the base end of the parallel link member 25. However, the hose guide 27 attached to the left side surface of the bending / bending boom 26 does not move to the right side of the bending / bending boom 26. It does not interfere with the parallel link member 25 disposed on one side. Further, since the left side plate 12l of the swivel base 12 is housed in the space provided between the bending boom 26 and the hose guide 27, the left side plate 12l and the hose guide 27 do not interfere with each other. In this way, the knuckle arm device 30 is stored in the height direction as compactly as possible, and as a result, the vehicle height H of the aerial work vehicle 10 as a whole is smaller than that of the conventional one (see FIG. 3). It can be kept quite low.

[0015]

[Effect of device]

 As described above, in the knuckle boom device of the present invention, by disposing the parallel link member above one side surface of the hoisting boom, the hoisting boom can be laid down to the last position with respect to the base. ing. Further, by disposing the guide means on the side opposite to the side where the parallel link members are arranged in the bending boom, even when the bending boom is stored directly above the hoisting boom, the guide means interferes with the parallel link members. I try not to. Therefore, this knuckle boom device is extremely compactly stored in the height direction. Therefore, in a work vehicle equipped with the present knuckle boom device, the vehicle height when the present knuckle boom device is stored can be kept low.

[Brief description of drawings]

FIG. 1 is a side view of an aerial work vehicle equipped with a knuckle boom device according to the present invention.

FIG. 2A is a view taken in the direction of arrow IIa in FIG.
(B) is a IIb direction arrow view in FIG.

FIG. 3 is a side view of an aerial work vehicle equipped with a conventional knuckle boom device.

[Explanation of symbols]

 20,30 Knuckle boom device 23,33 Elevating boom 24,34 Connecting member 25,35 Parallel link member 26,36 Bending / extending boom 27,37 Hose guide (guide means)

Claims (1)

[Scope of utility model registration request] 1. A hoisting boom mounted on a base so as to be hoisted, and a tip end portion of the hoisting boom is arranged so that both side surfaces of the tip end part are sandwiched inward, and is vertically swingably mounted. A connecting member, and between the mounting position of the tip end portion of the hoisting boom outside the one side surface of the connecting member and the mounting position of the base end portion of the hoisting boom on the base, A parallel link member attached so as to extend parallel to the boom, and a position above the attachment position of the tip end portion of the hoisting boom inside both side surfaces of the connecting member so that the hoisting boom can be flexed up and down. The bending / extending boom attached, and a hydraulic pipe or an electric cable attached to the outside of the side of the bending / extending boom opposite to the side where the parallel link members are arranged and extending from the base side. Knuckle boom and wherein the guide means for guiding the table or the like on the distal end side of the bending boom, in that it consists of.