JPH08324987A - High lift work vehicle - Google Patents

Abstract

PURPOSE: To relax restriction of a height limit or the like of a vehicle, also to improve a stable running property, by entering a base end part of a tip end boom between tip end parts of a pair of right/left boom members of constituting a base end boom when stored a boom, so as to suppress a space in a height direction. CONSTITUTION: In a vehicle 1, a boom 2 provided with a bucket 3 in the tip end is mounted, also to arrange jack devices 4, 5 in the rearward. Here is constituted the boom 2 by a base end boom 21 and a tip end boom 25. The base end boom 21 is constituted by a pair of right/left boom members 21a arranged in parallel with a suitable space apart, to turnably support a base end part of the tip end boom 25 between tip ends of these boom members by a pin 26. Further, when the boom 2 is stored, the base end boom 21 is horizontally arranged upward the vehicle 1, also to arrange the tip end boom 25 so as to be folded from upward in a side of this base end boom 21. Here is arranged the base end part of the tip end boom 25 so as to enter between tip end parts of the base end boom 21.

Description

Detailed Description of the Invention

[0001]

[0001] The present invention relates to an aerial work vehicle.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Utility Model Laid-Open No. 4-77593, a turning device is mounted on a vehicle so as to be able to turn horizontally, and a base end boom is provided on the turning device so as to be able to move up and down. There has been provided an aerial work vehicle in which a distal end boom is rotatably provided at a distal end portion of a proximal end boom, and a bucket is provided at a distal end portion of the distal end boom.

[0003]

However, in the conventional type in which the distal end boom rotates about the distal end of the proximal end boom, the distal end boom is folded toward the proximal end boom and stored. However, since the distal end boom and the proximal end boom are stored in a state where they are arranged substantially in parallel in the vertical direction, the height direction becomes bulky, and the vehicle is subject to restrictions such as height restrictions of the vehicle and stable running. There was a problem from the point of view.

[0004] In particular, in a vehicle in which the driver's seat portion and the cargo box portion are integrally formed in a box shape, it is indispensable to solve the above-described problems because the boom is disposed on the roof of the vehicle. In addition, there has been a demand for a device that allows an operator to easily and safely get into a bucket.

[0005]

According to a first aspect of the present invention, there is provided an aerial work vehicle, wherein a boom is provided on the vehicle so as to be able to move up and down, and a bucket is provided at a tip of the boom, and the boom is provided on both front and rear sides of the vehicle. In an aerial work vehicle provided with a jack device for supporting a vehicle, the boom includes a base boom pivotally supported on an upper end of a turning device mounted on the vehicle so as to be able to move up and down, and a tip of the base boom. The base end boom is constituted by a pair of left and right boom members arranged in parallel at appropriate intervals, between the distal ends of these boom members. While the base end of the tip boom is pivotally supported, the bucket is provided at the tip of the tip boom, and when the boom is stored, the base boom is arranged substantially horizontally above the vehicle,
The distal boom is configured to be folded from above toward the proximal boom side, and the proximal end portion of the distal boom is arranged so as to be inserted between the distal end portions of the proximal boom.

According to a second aspect of the present invention, in the aerial work vehicle, the vehicle is configured such that a driver's seat portion and a packing box portion are formed in an integrated box shape.

According to a third aspect of the present invention, in a state where the base end boom is arranged substantially horizontally above the vehicle, the bucket can be arranged near the ground by rotating only the tip end boom. It is configured to be able to get on and off between the bucket and the ground.

According to a fourth aspect of the present invention, there is provided an aerial work vehicle in which the bucket arranged near the ground is capable of making a full turn around the vehicle by the turn of the base boom.

According to a fifth aspect of the present invention, in the aerial vehicle, the raising and lowering operation of the base boom is performed by a raising and lowering cylinder, and the rotating operation of the distal end boom is performed by a rotary cylinder. At least one of the rotary cylinders has a pilot check valve interposed in a flow path connected to the piston chamber side of the cylinder and a flow path connected to the load chamber side of the cylinder.

According to a sixth aspect of the present invention, at least the turning device, the base end boom, and the front end boom are unitized.

According to a seventh aspect of the present invention, in the aerial vehicle, the base boom and the tip boom are provided with horizontal holding means for holding the bucket in a horizontal state regardless of the movement of the base boom and the tip boom. A first sprocket integrally provided on a first support pin supported on a distal end of the distal boom, and a second support pin pivotally supporting the proximal boom and the distal boom. , A first chain wound between the first and second sprockets, and a third sprocket provided on the second support pin so as to be rotatable integrally with the second sprocket. And a fourth sprocket integrally provided on a third support pin supported on the base end of the base end boom 21;
A second chain wound between fourth sprockets, and a bracket for attaching the bucket to the first support pin is integrally provided, while the third sprocket and the fourth sprocket have a U-shaped cross section. It is housed in the formed boom member.

According to an eighth aspect of the present invention, in the aerial work vehicle, a holding stand for holding the base end boom in a storage position is provided on an upper surface of the packing box, and the holding stand is a roof of the packing box. It is supported by a portal frame disposed in the packing box with the surface interposed therebetween.

According to a ninth aspect of the present invention, there is provided an aerial working vehicle wherein, of the front and rear jack devices, the jack devices disposed on both sides of a rear portion have a jack body disposed in the packing box portion, The lower end of the jack body is penetrated from the bottom of the packing box.

An aerial work vehicle according to claim 10 of the present invention is
Among the front and rear jack devices, the jack devices arranged on both sides of the front part are provided in a substantially V-shape so as to project inward and obliquely downward from the side surface of the vehicle body.

An aerial work vehicle according to claim 11 of the present invention is
The bucket includes a lower frame and an upper frame connected to an upper portion of the lower frame, and the upper frame is configured to be foldable toward the lower frame.

According to a twelfth aspect of the present invention, there is provided an aerial platform vehicle, comprising:
At least the lower frame of the bucket is provided with a cover for covering the lower frame.

According to a thirteenth aspect of the present invention, there is provided an aerial work vehicle, comprising:
The bucket has a lower frame whose peripheral surface is covered with a covering body, an upper frame slidably provided in an upward and downward direction from the lower frame, and an upper frame with the upper frame pulled out upward. And fixing means for fixing.

The aerial work vehicle according to claim 14 of the present invention is
The upper frame is provided by inserting a vertical frame into a sliding member provided on the lower frame, and a sliding contact member for preventing a sharp drop of the upper frame between the vertical frame and the sliding member is provided. It was interposed.

The aerial work vehicle according to claim 15 of the present invention is
An operating device capable of operating at least a boom and a swing device is provided on the bucket so as to be rotatable between a storage position arranged inside the bucket and a work position arranged outside the bucket. It is.

The aerial work vehicle according to claim 16 of the present invention,
The bucket is provided with detection means for detecting whether or not the upper frame is at a work position where the upper frame projects upward from the lower frame, and the operation of each actuator is performed only when the upper frame is placed at the work position by the detection means. Is configured to be possible.

The aerial work vehicle according to claim 17 of the present invention is
A boom position confirmation member is provided at the distal end of the base boom, and when the boom is stored, at least the driver can confirm the distal end of the proximal boom located at the rear end of the vehicle by the boom position confirmation member. It is constituted in.

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 schematically shows the overall construction of an aerial work vehicle according to the present invention.

In FIG. 1, reference numeral 1 denotes a vehicle. In this example, a so-called one-box type vehicle 1 in which a packing box 1a and a driver's seat 1b are formed in an integrated box shape is taken as an example. explain.

The vehicle 1 is equipped with a boom 2 having a bucket 3 at the tip. Further, a jack device 4 is provided at a front portion of the vehicle 1 and a jack device 5 is provided at a rear portion.

The jack device 4 stably supports the vehicle 1 with the jack device 5 at the time of working at a high place, and is provided on both front portions of the vehicle 1 so as to be extendable and contractable downward.

As shown in FIGS. 2 and 3, the jack device 4 is provided on a mounting member 42 extending forward from the front end of the vehicle body frame 11 of the vehicle 1.

The mounting member 42 has a pair of left and right overhanging frames 42a, 42a which extend forward and horizontally from the brackets 12 fixed to the left and right of the front end of the body frame 11, and the tips of these overhanging frames 42a, 42a. And a mounting frame 42b (see FIG. 3) installed in the width direction of the vehicle 1.

At both ends of the mounting frame 42b, mounting portions 42c are provided, and the jack device 4 is vertically arranged on the mounting portions 42c.

As shown in FIG. 2, the jack device 4 is arranged as described above with the expansion / contraction part 4a downward, and the expansion / contraction part 4a is extended downward when working at a high place. The vehicle 1 is supported by grounding the support member 4b provided at the lower end of 4a to the ground.

By arranging the jack device 4 so as to extend in front of the vehicle 1 as described above, a large support range of the vehicle 1 by the jack device 4 and the jack device 5 can be secured, and the vehicle 1 can be stably maintained. Can be supported.

A front bumper 13 (see FIG. 2) is arranged in front of the mounting member 42, and the mounting member 42 (mainly, the mounting frame 42b) can be used as a reinforcing material for the front bumper 13. The front bumper 13 and the front impact from an accident etc.
Can be protected.

As shown in FIG. 4, the jack device 5 is vertically arranged on both sides of the rear portion of the vehicle 1 with its elastic portion 5a facing down.

The jack device 5 includes a jack body 5b.
Is arranged in the luggage box portion 1a which constitutes the rear portion of the vehicle 1, and only the expansion / contraction portion 5a is penetrated from the bottom surface of the luggage box portion 1a. That is, the jack device 5 supports the vehicle 1 by extending the extendable portion 5a downward from the vehicle 1 side and grounding the support member 5c provided at the lower end to the ground.

In this embodiment, only the expansion and contraction portion 5a of the jack device 5 is arranged so as to penetrate from the bottom of the packing box portion 1a.
The lower end of the jack main body 5b of the jack device 5 may be disposed so as to penetrate therethrough, and the lower end of the jack main body 5b and the elastic portion 5a may be projected downward.

The boom 2 comprises a base end boom 21 and a tip end boom 25.

The base end portion of the base end boom 21 is pivotally supported via a bracket 22 on the upper end of a turning device 2a mounted in the cargo box portion 1a of the vehicle 1.

The turning device 2a includes a hydraulic motor 104.
(See FIG. 13) and the like, and is horizontally rotatable by a driving means, and the upper end portion is arranged so as to pass through the top surface of the packing box 1a.

A hoisting cylinder 23 is interposed between the base end boom 21 and the bracket 22, and the hoisting cylinder 23 allows the base end boom 21 to hoist freely.

As shown in FIG. 6, the base end boom 21 is composed of a pair of left and right boom members 21a, 21a arranged in parallel at appropriate intervals.
The proximal end of the distal end boom 25 is rotatably supported by a pin 26 between the distal ends of 1a and 21a.

The boom members 21a, 21a are formed in a U-shaped cross section as shown in FIG. 8, and are arranged with their openings facing inward. It is configured to accommodate the sprocket 64 and the like of the holding means 6.

As shown in FIGS. 1 and 5, a rotary cylinder 27 is provided between the base end boom 21 and the distal end boom 25 via operating links 28a and 28b. The distal end boom 25 is configured to rotate about the base end with respect to the base end boom 21 by the expansion and contraction operation.

In the boom 2 constructed as described above, the base boom 21 is disposed substantially horizontally above the vehicle 1 as shown in FIG.
The tip boom 25 is arranged on one side so as to be folded from above. At this time, the proximal end of the distal end boom 25 is disposed so as to enter between the distal ends of the proximal end boom 21 as shown in FIG.

A holding table 15 for holding the boom 2 in the above-mentioned storage position is provided on the upper surface of the rear portion of the luggage box 1a.

The holding table 15 is supported by a portal frame 16 disposed inside the packing box 1a with the upper surface of the packing box 1a interposed therebetween in terms of strength. When holding the boom 2, the holding table 15 is properly designed so as not to interfere with peripheral members such as the rotating cylinder 27.

The tip of the tip boom 25 has a bucket 3
Is provided.

The bucket 3 is attached to a bracket 31 fixed vertically to the tip of the tip boom 25.

As shown in FIGS. 5 and 6, the bracket 31 is provided with a support pin 32 pivotally supported at the tip of the tip boom 25.
It is provided integrally with.

Here, the bucket 3 provided on the bracket 31 is always held horizontally by the horizontal holding means 6 irrespective of the raising / lowering operation of the base end boom 21 and the turning operation of the distal end boom 25. ing.

The horizontal holding means 6 includes the support pins 32
, A second sprocket 62 provided on the pin 26 at the distal end of the base boom 21, and first and second sprockets 61, 62.
A first chain 63 wound between them, a third sprocket 64 provided on the outer end side of the pin 26, and a fourth sprocket 65 integrally provided on the pin 29 at the base end of the base boom 21. , And a second chain 66 wound between these sprockets 64, 65.

As shown in FIG. 8, the second sprocket 62 and the third sprocket 64 are integrally formed and provided on the pin 26 via a bearing 67.

The third sprocket 64 and the fourth sprocket 65 are arranged in a state housed in the boom member 21a, and can be easily and easily arranged by utilizing the boom member 21a. .

Accordingly, with the raising / lowering operation of the base end boom 21 and the turning operation of the distal end boom 25, each of the first to fourth sprockets 61, 62, 64, 65 turns by an amount corresponding to the turning operation, By transmitting this to the bracket 31 via the first and second chains 63 and 66, the bucket 3 can be always kept horizontal.

As shown in FIG. 9, the bucket 3 is composed of a lower frame 33 formed in a substantially cubic frame, and an upper frame 34 connected to the upper part of the lower frame 33.

The upper frame 34 comprises four vertical frames 35 standing upright from the upper frame of the lower frame 33, and a rectangular frame 3 arranged over the upper ends of these vertical frames 35.
It is composed of 6.

As shown in FIG. 10, the vertical frame 35 has a lower member 35a and an upper member 35b pivotally supported by pins 37a and 37b via a connecting member 35c. Are arranged vertically in a straight line, and this state is fixed by fixing means 37. Accordingly, the upper frame 34 is configured to be foldable toward the lower frame 33 as shown in FIG.

As shown in FIG. 10, the fixing means 37 includes the pins 37a and 37b and the upper and lower pins 37a and 3b.
It comprises a fixing member 37c arranged over 7b.

A groove 37d is formed in the fixing member 37c. By inserting and locking the groove 37d over the pins 37a and 37b, the lower member 35a and the upper member 35b are stably arranged in a straight line. Can be fixed. Further, the fixing members 37c are moved from the pins 37a and 37b.
The vertical frame 35 can be folded by pulling upward.

Here, when the base boom 21 is disposed substantially horizontally above the vehicle 1, the above-mentioned boom 2 is rotated only by the tip boom 25.
The rear end of the base boom 21 and the front end boom 25 are set so that the bucket 3 provided at the front end of the front end boom 25 can be positioned near the ground. . Also, as described above, bucket 3
The length of the base end boom 21 is set such that the base end boom 21 can be turned all the way without interfering with the periphery of the vehicle 1 by turning the base end boom 21 in a state where is disposed near the ground.

The aerial work vehicle thus constructed is configured such that each operation of the turning device 2a and the boom 2 can be operated by the operating device 7 disposed on the vehicle 1 side, and is mounted on the bucket 3. The operation device 8 is also configured to be operable.

As shown in FIG. 11, the operating device 8 mounted on the bucket 3 has a storage position (see a dashed line) disposed inside the bucket 3 and a work position (see a solid line) disposed outside the bucket 3. ) Are rotatably disposed on the rectangular frame 36 of the upper frame 34 via an arm 81.

The operating device 8 is stably held by a stopper or the like (not shown) at the above-mentioned storage position and working position.

FIG. 13 shows an operating system of the up-and-down cylinder 23, the rotating cylinder 27 and the like.

In FIG. 13, 101, 102, 103
Is a switching valve configured to be switchable by operating the operation switches or operation levers of the operation devices 7 and 8, and the hydraulic oil discharged from the pump P passes through the switching valves 101 to 103, the hydraulic motor 104, the up / down cylinder 23, Rotating cylinder 27
Is supplied to.

Piston chamber 23a of the undulating cylinder 23
A pilot check valve 107, a flow passage 105 connected to the side of the rod chamber 23b, and a flow passage 106 connected to the side of the rod chamber 23b.
108 are interposed.

The pilot check valve 107 guides the pilot pressure from the flow path 106 on the opposite side.
The flow path 105 is opened when the inside pressure reaches a predetermined pressure.

Similarly, the pilot check valve 108 also guides the pilot pressure from the flow passage 105 on the opposite side, and opens the flow passage 106 when the pressure in the flow passage 105 reaches a predetermined pressure.

By providing the pilot check valves 107 and 108 in the flow passages 105 and 106 in this manner, when the up-and-down cylinder 23 is extended and retracted, when the operation is stopped, the up-and-down operation of the up-and-down cylinder 23 due to the inertia force can be performed. That is, the raising / lowering operation of the base end boom 21 can be suppressed.

The pilot check valve 1 is also provided in the flow path 110 communicating with the piston chamber 27a of the rotary cylinder 27 and the flow path 111 communicating with the rod chamber 27b.
12 and 113 are interposed, and the undulating cylinder 23 is provided.
Similarly to the above, when the rotation cylinder 27 is expanded and contracted, the rotation cylinder 27 is caused by inertia force when the operation is stopped.
It is possible to suppress the expansion and contraction operation of the above, that is, the rotation operation of the tip boom 25.

Next, the operation of the aerial vehicle constructed as described above will be described.

First, when performing high-altitude work, the vehicle 1 is moved to a work place and parked. After this, the jack device 4,
5, the supporting members 4b of the telescopic parts 4a, 5a,
5c is installed to stably support the vehicle 1.

Then, the tip boom 25 is rotated to a position substantially vertical to the rear of the vehicle 1 as shown by a dashed line in FIG. 1, and the bucket 3 is arranged at the lowest position close to the ground. Thereafter, the worker gets into the bucket 3 in a state where the upper frame 34 is folded, and after the worker gets into the bucket 3, the upper frame 34 is extended upward and fixed and held in this state by the fixing means 37. As described above, since the worker gets into the bucket 3 in which the upper frame 34 is folded, the worker can safely get into the bucket 3 from the ground.

When it is not preferable to arrange the bucket 3 behind the vehicle 1 due to the unloading of the equipment from the cargo box 1a, etc., after the base boom 21 is rotated to an appropriate turning position in advance, By rotating the tip boom 25 as described above, the bucket 3 can be moved from anywhere around the vehicle 1.
You can get on board. This is also effective when there is an obstacle or the like in a part of the periphery of the vehicle 1 at the work place.

Next, the operator rotates the operating device 8 from the stowed position to the working position to move the operating device 8 to the bucket 3.
Place it outside.

The operator turns the turning device 2a by the operating device 8 arranged outside the bucket 3 as described above, and also raises and lowers the base boom 21 and the tip boom 25.
By performing the rotating operation of, the bucket 3 provided at the tip portion of the tip boom 25 is arranged at a high position, and an appropriate work at a high position is performed.

At this time, the bucket 3 is always kept in a horizontal state by the horizontal holding means irrespective of the raising / lowering operation of the base end boom 21 and the turning operation of the distal end boom 25, so that the worker riding on the bucket 3 can be safely raised. Can be transported to the location.

The operating device 8 is arranged at the storage position in the bucket 3 when the work is not performed, so that the operating device 8 is protected from an external impact or the like.

The operation of the turning device 2a and the boom 2 can be performed by another operator operating the operating device 7 provided on the vehicle 1 in addition to the operating device 8 provided on the bucket 3.

Next, when the work is completed at a high position, the operation device 8 is operated to place the bucket 3 in the stored state as shown in FIG. The retracted state is the tip boom 2
5 is disposed so as to enter between the distal ends of the proximal booms 21. By storing and arranging the boom 2 in this manner, the space in the height direction can be suppressed as much as possible. The one-box type as described in the embodiment is particularly effective.

Further, at the time of the raising and lowering operation of the base end boom 21 and the rotating operation of the distal end boom 25, the pilot check valves 107, 108, 112 and 113 are connected to the raising and lowering cylinder 23 and the rotating cylinder 27 which perform these operations. When the supply of pressure oil to each flow path is stopped,
The pressure in the flow path decreases, and the corresponding pilot check valve closes. Therefore, when the operation of the up-and-down cylinder 23 and the rotation cylinder 27 is stopped, expansion and contraction due to inertial force can be suppressed, and the base end boom 21 and the distal end boom 25 can be accurately stopped at desired positions. Therefore, the base boom 21 and the distal boom 25 can be easily positioned at the time of storage or the like, and can be easily and accurately positioned at a predetermined position on the roof of the vehicle 1 mounted on the roof as in this example. Can be conveniently placed.

FIG. 12 shows a structure in which the peripheral surfaces of the lower frame 33 and the upper frame 34 of the bucket 3 are covered with a cloth-like member (cover) 9, and the upper opening of the bucket 3 has a cloth-like lid member. Reference numeral 91 denotes a fastener 92 which can be opened and closed freely.

As described above, the lower frame 33 and the upper frame 3
By covering the peripheral surface of the bucket 4 with the cloth-like member 9, a tool or the like brought into the bucket 3 is not accidentally dropped and is safe, and an operator who gets into the bucket 3 is also safe. In this example, the case where both the lower frame 33 and the upper frame 34 are covered with the cloth member 9 has been described, but only the lower frame 33 is covered with the cloth member 9 without covering the upper frame 34. May be.

In this embodiment, the one-box type vehicle 1 with the boom 2 and the bucket 3 mounted thereon has been described. However, the vehicle 1 is not limited to the one-box type.
For example, it can be mounted on various vehicles such as trucks.

In this case, the base member boom 21, the distal end boom 25, the turning device 2a, the bucket 3, and the mounting members such as the operating devices 7 and 8 are unitized to form the vehicle 1
The body can be easily installed.

FIG. 14 shows an example of the arrangement of the front jack device.

The jack device 4 is provided with brackets 45 on both sides of the front end of the vehicle body frame 11 which is inward of both side surfaces of the vehicle 1.
Are arranged in a V shape through the, and the expansion and contraction portion thereof is provided so as to project downward.

Here, the front jack device 4 is provided at the front end of the vehicle body frame 11 so as to protrude from the vehicle body frame 11 on both right and left sides, that is, on both sides of the front bumper of the vehicle 1, so that the support range is And the vehicle 1 can be supported most stably. However, when the jack device 4 is arranged so as to project from the body frame 11 to both sides, when the vehicle 1 is supported by the jack device 4,
There arises a problem that the body frame 11 is likely to be twisted. This torsion is particularly problematic at the front end where the strength of the vehicle body frame 11 cannot be degraded. Further, since there are headlights and turn indicators on both front sides of the vehicle 1, it is necessary to arrange them so as not to interfere with these headlights and turn indicators.

Therefore, in this example, the jack device 4 is arranged on the inner side of the vehicle 1 in the width direction, which is more inward than both sides, and at a position where it does not interfere with the headlights (this position is the front end of the vehicle body frame 11). Further, the lower side of each jack device 4 is inclined outward so as to have a large support range when supported by the jack device 4, so that the jack device 4 has a V-shape.

In other words, by arranging the jack device 4 at an angle in the shape of a letter C, the position where the ground member 46 touches the ground by the amount of the inclination without projecting the jack device 4 to both sides. Can be widely secured.

15 to 17 show still another structure of the bucket.

The bucket 3 includes a lower frame 301 and
The upper frame 302 is slidable upward and downward from the lower frame 301, and a fixing means 310 for fixing the upper frame 302 in a state where the upper frame 302 is pulled upward from the lower frame 301. ing.

The peripheral surface of the lower frame 301 is
It is covered with 01a.

The upper frame 302 is formed in a frame shape by a plurality of vertical frames 303 and a rectangular horizontal frame 304 connected to the upper ends of these vertical frames 303.

Each of the vertical frames 303 is inserted into a sliding member 305 provided on the lower frame 301, and is slidably provided in a vertical direction.

[0095] Of the four vertical frames 303, two of them are formed in a U-shape with their lower ends continuously provided.

As shown in FIG. 18, the sliding member 305 is formed in a tubular shape having a rectangular cross section by various members, and a vertical frame 303 is inserted into the sliding member 305 via a sliding contact member 306. Has been inserted.

The sliding contact member 306, as shown in FIG.
The upper and lower ends are formed of flat plates bent in a hook shape, and are arranged by fitting the upper and lower ends of the sliding contact member 306 into various members constituting the sliding member 305.

The sliding contact members 306 are in sliding contact with the peripheral surface 4 of the vertical frame 303 with an appropriate force so as to prevent the upper frame 302 from dropping suddenly.

The fixing means 310 is mounted on the upper frame 302
A lock pin 311 provided on the lower frame 301 side, a lock hole 312 (see FIG. 20) provided on the lower frame 301 side, and an operating member 313 for engaging and disengaging the lock pin 311.

The locking pin 311 and the locking hole 312 are set so as to be locked at the work position where the upper frame 302 projects upward.

An operating member 313 is provided with an operating lever 314 provided on the horizontal frame 304 of the upper frame 302 and an operating rod 315 connected to the operating lever 314 for engaging and disengaging the locking pin 311 with the locking hole 312. And an operating link 316.

The operating rod 315 and the operating link 31
6 is configured such that when the operator grips the operation lever 314, the locking pin 311 is disengaged from the locking hole 312, and the locking pin 311 is normally locked by the urging force of a spring (not shown). It is urged in a direction to engage with the hole 312.

The bucket 3 constructed as described above is arranged at a work position where the upper frame 302 is pulled upward from the lower frame 301 and is projected upward, and the locking pin 311 as the fixing means 310 is locked in the locking hole. By engaging with 312,
The upper frame 302 is held in a stable state in the working position. When the upper frame 302 is returned from the working position to the storage position, the operating rod 314 is operated by the operating lever 314.
The upper frame 302 can be housed on the lower frame 301 side by disengaging the locking pin 311 from the locking hole 312 via the actuator 5 and the operation link 316. On this occasion,
Since the upper frame 302 descends while slidingly contacting the sliding contact member 306 with an appropriate force, the upper frame 302 can be safely placed up to the storage position without dropping suddenly.

Further, the bucket 3 is provided with a detector 320 such as a limit switch.

As shown in FIG. 20, when the locking pin 311 is locked in the locking hole 312, the detector 320
21 is arranged so as to contact the tip of the locking pin 311. That is, this state is detected when the upper frame 302 is placed at the work position.
The actuators for operating the boom 2 can be operated by a control system such as an electric circuit (not shown) only when the is placed in the working position.

As described above, the boom operation can be performed only when the upper frame 302 is located at the working position, depending on whether or not the detector 320 has detected, so that the bucket 3 composed of upper and lower two-stage frames can be used. It is possible to prevent a worker from dropping and the like, and it is possible to improve work safety.

The detector is not limited to the one that comes into contact with the locking pin 311 as in the above-described example, but may be placed so as to come into contact with the vertical frame 303 placed at the working position. May be detected at the storage position, and when not at the storage position, it may be determined to be the work position.

FIGS. 21 to 23 show an aerial work vehicle according to the seventeenth aspect. The same members as those of the aerial work vehicle described above are designated by the same reference numerals, and description thereof will be omitted.

In this aerial work vehicle, a boom position confirmation member 400 is provided at the distal end of the base end boom 21 as shown in FIG.

The boom position confirmation member 400 is suspended from the operating link 28a disposed at the distal end of the base end boom 21 via a connecting member 401.

The connecting member 401 includes a rotary cylinder 2
7 rod ends 27c are connected. Therefore, the rotation cylinder 27 is connected to the operation link 2 via the connecting member 401.
8a, thereby causing the tip boom 25 to pivot.

The boom position confirmation member 400 is shown in FIG.
Also, as shown in FIG. 23, it is formed in a flexible plate-like body such as rubber, and its base end portion is the connecting member 40.
1 and a proximal end boom 2
1 is disposed in a state of being suspended downward by a predetermined length from the distal end portion.

When the boom 2 is retracted, the length of the boom position checking member 400 that is hung down from the distal end of the proximal boom 21 is determined by the length of the distal end of the proximal boom 21 that is disposed at the rearmost position of the vehicle 1. The part is set to a length that can be confirmed by the driver by the boom position confirmation member 400. In addition, by coloring with a fluorescent color or the like, it is possible to make it easier for the driver to see.

Therefore, the driver can confirm the position of the tip end portion of the base end boom 21 located at the rearmost end of the vehicle 1 by checking the boom position confirming member 400 when the vehicle 1 moves backward. Interference with rear obstacles can be avoided. Further, at the time of traveling, the driver of the succeeding vehicle can also recognize the position of the boom 2 and can travel safely.

[0115]

As described above, according to the aerial work vehicle of the first aspect of the present invention, the boom has the boom which is pivotally supported by the turning device mounted on the vehicle, and the base boom. It consists of a tip boom that is rotatably supported at the tip of the boom, and when the boom is retracted, the base end of the tip boom enters between the tip ends of the pair of left and right boom members that make up the base boom. Since it is folded and arranged, the space in the height direction when the boom is stored can be suppressed as much as possible, and restrictions such as vehicle height restrictions can be relaxed and stable traveling performance can be improved. Particularly, the present invention is effective for an aerial work vehicle according to the second aspect, wherein the driver's seat portion and the packing box portion are formed in an integrated box shape. According to the aerial work vehicle of claim 3, the bucket can be arranged near the ground by rotating only the tip boom when the base boom is arranged substantially horizontally above the vehicle. A worker can easily get on and off between the bucket and the ground.

According to the aerial work vehicle according to the fourth aspect, the bucket disposed near the ground is configured so as to be able to make a full turn around the vehicle by turning the base end boom, thereby loading the equipment from the vehicle. When it is not preferable to dispose the bucket behind the vehicle due to unloading or the like, the bucket can be arranged anywhere around the vehicle, and the unloading and loading of the equipment can be performed efficiently. Further, it is also effective when an obstacle or the like exists in a part of the periphery of the vehicle in the work place.

According to the aerial work vehicle of the fifth aspect of the present invention, the pilot check valve is provided in the flow passage communicating with the piston chamber side of the cylinder and the flow passage communicating with the load chamber side of the cylinder. Expansion and contraction of the cylinder due to inertial force when the operation of the cylinder is stopped, the boom that operates due to the expansion and contraction of the cylinder can be accurately stopped at a desired position, and the boom can be easily positioned during storage. It can be carried out.

According to the aerial work vehicle of the sixth aspect, at least the turning device, the base end boom, and the tip end boom are unitized, so that they can be easily mounted on various vehicles and are versatile. It will be excellent.

[0119] According to the aerial work vehicle of the seventh aspect, the horizontal holding means includes the first boom supported by the tip of the tip boom.
A first sprocket provided integrally with the support pin, a second sprocket provided on a second support pin for pivotally supporting the base end boom and the distal end boom, and wound between the first and second sprockets; A first chain, a third sprocket provided on the second support pin so as to be rotatable integrally with the second sprocket, and a third support pin supported on a base end of the base boom 21. The first support pin comprises a fourth sprocket provided and a second chain wound between the third and fourth sprockets, and a bracket for attaching the bucket to the first support pin is integrally provided. Since the 3rd sprocket and the 4th sprocket are housed in the boom member having a U-shaped cross section, the horizontal holding means allows the base boom to move up and down and the tip boom to rotate. Regardless of the operation, the bucket can always be held in a horizontal state, and the worker riding on the bucket can be safely transported to a high position, and the third sprocket and the fourth sprocket can be easily and easily utilized using the boom member. Can be arranged.

According to the aerial work vehicle of the eighth aspect, a holding base for holding the base boom at the retracted position is provided on the roof surface of the cargo box of the vehicle, and the holding base sandwiches the upper surface of the cargo box. Since it is supported by the gate-shaped frame arranged in the luggage box, the boom can be stably held in the retracted position with a simple structure.

According to the aerial work vehicle according to the ninth aspect, the jack body of the jack device disposed on both sides of the rear portion is disposed in the packing box, and the lower end portion of the expansion / contraction portion or the jack body is positioned from the bottom of the packing box portion. When the jack device is retracted, the lower end of the telescopic part or the lower end of the jack body projects only slightly downward when the jack device is retracted, and it is safely protected without interference with other members etc. can do.

According to the tenth aspect of the present invention, the jacks arranged on both sides of the front portion are provided in a substantially C shape so as to project inward and diagonally downward from the side of the vehicle body. Therefore, without protruding the jack device to both sides, it does not obstruct the headlights and direction indicators of the vehicle, and
A wide supporting range of the vehicle can be secured by an amount corresponding to the inclination.

According to the aerial work vehicle of the eleventh aspect, the bucket is composed of a lower frame and an upper frame connected to the upper part of the lower frame, and the upper frame is freely foldable to the lower frame side. With this configuration, the bucket can be stored in a small size when the work is not performed, and the worker can easily and safely get on the bucket from the ground, and the workability is good.

According to the aerial work vehicle of the twelfth aspect, at least the lower frame of the bucket is provided with the cover for covering the lower frame, so that tools and the like do not drop carelessly and safely. You can do the work.

According to the aerial work vehicle of the thirteenth aspect, the lower frame whose bucket is covered with the covering body, and the upper frame which is slidably provided upward and downward from the lower frame. And the fixing means for fixing the upper frame with the upper frame pulled out upward, so that the upper frame can be easily arranged at the working position, and can also be easily arranged from the working position to the storage position. When the work is not performed, the bucket can be stored in a small size, and the operator can easily and safely get into the bucket from the ground, and the workability is good.

According to the aerial work vehicle of the fourteenth aspect, the vertical frame of the upper frame is inserted into the sliding member provided on the lower frame via the sliding contact member, and the sliding contact member rapidly moves the upper frame. By preventing the upper frame from falling, the upper frame can be safely placed at the work position and the storage position.

According to the aerial work vehicle according to the fifteenth aspect, at least the operating device capable of operating the boom and the turning device is arranged on the bucket at the storage position arranged inside the bucket and outside the bucket. By being rotatable between the work position, the operating device is placed in the storage position to protect the operating device when not performing high-altitude work, and to operate when performing high-altitude work. Can be arranged at the work position, and workability in the bucket can be improved.

According to a sixteenth aspect of the present invention, a bucket is provided with a detecting means for detecting whether or not the upper frame is at a working position in which the upper frame projects upward from the lower frame, and the detecting means detects the upper frame. By allowing each actuator to be operated only when is placed in the working position,
It is possible to prevent a worker from falling from a bucket constituted by a step frame, and to improve work safety.

[0129] According to the aerial work vehicle according to the seventeenth aspect, the boom position confirmation member is provided at the tip of the base boom, and the driver can move the tip of the base boom, which is the rearmost part of the vehicle when the boom is retracted, by the driver. The driver can confirm the position of the tip of the base boom located at the rear end of the vehicle by checking the boom position confirmation member when moving the vehicle backward. Interference with objects can be avoided. In addition, during traveling, the driver of the following vehicle can also recognize the position of the boom, and can travel safely.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of an aerial work vehicle according to the present invention.

FIG. 2 is a side view showing a jack device arranged on both sides of a front portion of the vehicle.

FIG. 3 is a plan view showing jack devices arranged on both sides of a front portion of the vehicle.

FIG. 4 is a side view showing jack devices arranged on both sides of a rear portion of the vehicle.

FIG. 5 is a side view showing a configuration of a boom.

FIG. 6 is a plan view showing a configuration of a boom.

FIG. 7 is a side view showing a configuration of horizontal holding means.

8 is a cross-sectional view taken along the line AA in FIG.

FIG. 9 is a side view showing a bucket.

FIG. 10 is an enlarged side view showing the configuration of the fixing means.

FIG. 11 is a side view showing the bucket in a state where the upper frame is folded.

FIG. 12 is a perspective view showing a bucket whose outer surface is covered with a cover.

FIG. 13 is a hydraulic circuit diagram showing an operation system such as an up-and-down cylinder and a rotating cylinder.

FIG. 14 is a front view showing an arrangement state of jack devices arranged on both sides of a front part.

FIG. 15 is a plan view showing a bucket.

FIG. 16 is a side view showing a bucket.

FIG. 17 is a side view showing a bucket in which an upper frame is arranged at a working position.

FIG. 18 is a plan view showing a sliding member having a sliding contact member interposed therein.

19 is a cross-sectional view taken along the line AA in FIG.

FIG. 20 is a partially enlarged view showing a locking pin and a locking hole in the fixing means.

FIG. 21 is a side view showing a rear portion of an aerial work vehicle provided with a boom position confirmation member.

FIG. 22 is a perspective view showing a boom position confirmation member.

FIG. 23 is a side view showing a boom position confirmation member.

[Explanation of symbols]

 1 Vehicle 1a Packing Box 1b Driver's Seat 11 Body Frame 13 Front Bumper 15 Holding Stand 16 Gate Frame 2 Boom 2a Revolving Device 21 Base Boom 21a Boom Member 25 Tip Boom 3 Bucket 33 Lower Frame 34 Upper Frame 301 Lower Frame 302 Upper Frame 305 Sliding member 306 Sliding contact member 310 Fixing means 320 Detector (detecting means) 4 Jack device arranged on both sides of front part 42 Mounting member 5 Jack device arranged on both sides of rear part 5a Telescopic part 5b Jack body 6 Horizontal holding Means 61 First sprocket 62 Second sprocket 63 First chain 64 Third sprocket 65 Fourth sprocket 66 Second chain 8 Operating device 9 Cover 400 Boom position confirmation member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukichi Okuda 2 Sakaemachi, Sano-shi, Tochigi Prefecture Shinmeiwa Industrial Co., Ltd. Specially equipped vehicle division (72) Inventor Yoshikazu Horinouchi 2 Sakae-cho, Sano-shi, Tochigi Prefecture Specialized vehicle business Inside (72) Inventor Takenobu Kiyokami 2 Sakaemachi, Sano City, Tochigi Prefecture Shinmeiwa Industrial Co., Ltd.

Claims (17)

[Claims] 1. An aerial vehicle in which a vehicle is provided with a boom that can be raised and lowered, a bucket is provided at a tip of the boom, and jack devices for supporting the vehicle are provided on both front and rear sides of the vehicle. Comprises a base boom pivotally supported at the upper end of a turning device mounted on the vehicle so as to be able to move up and down, and a distal boom pivotally supported at a distal end of the base boom so as to be rotatable. The base end boom is constituted by a pair of left and right boom members arranged in parallel at appropriate intervals, and the base end of the end boom is pivotally supported between the ends of these boom members. The bucket is provided at the distal end, and when the boom is stored, the proximal end boom is arranged substantially horizontally above the vehicle, and the distal end boom is folded on the proximal end boom side from above. Aerial base end portion of which is characterized in that is adapted to be placed enters between the tip portion of the proximal boom. 2. The aerial work vehicle according to claim 1, wherein the vehicle has a driver's seat portion and a cargo box portion formed in an integrated box shape. 3. When the base end boom is arranged substantially horizontally above the vehicle, a bucket can be arranged near the ground by turning only the tip end boom, and the bucket can get on and off between the bucket and the ground. The aerial work vehicle according to claim 1 or 2, which is configured to be able to be used. 4. The aerial work vehicle according to claim 3, wherein the bucket disposed near the ground is configured to be able to make a full turn around the vehicle by turning a base end boom. 5. The hoisting motion of the base boom is performed by a hoisting cylinder, and the turning motion of the tip boom is performed by a turning cylinder, and at least one of the hoisting cylinder and the turning cylinder has a cylinder. ,
The aerial work vehicle according to claim 1, 2, 3 or 4, wherein a pilot check valve is provided in a flow path communicating with the piston chamber side of the cylinder and a flow path communicating with the load chamber side. 6. At least the swivel device, a proximal boom,
The aerial work vehicle according to claim 1, 2, 3 or 4, wherein the tip boom is unitized. 7. The base boom and the tip boom are provided with horizontal holding means for holding the bucket in a horizontal state regardless of the movement of the base boom and the tip boom, and the horizontal holding means is provided with the tip boom. A first sprocket provided integrally with a first support pin supported by a distal end of the first and second sprockets provided on a second support pin pivotally supporting the base end boom and the distal end boom; A first chain wound between the second sprockets, a third sprocket provided on the second support pin so as to be rotatable integrally with the second sprocket, and a first chain supported on the base end of the base end boom 21. A fourth sprocket provided integrally with the third support pin, and a second sprocket wound between the third and fourth sprockets.
A bracket for attaching the bucket to the first support pin is provided integrally with the chain, and the third sprocket and the fourth sprocket are housed in the boom member having a U-shaped cross section. The aerial work vehicle according to claim 1, 2, 3, 4, or 5. 8. A holding table is provided on the upper surface of the cargo box section for holding the proximal boom in the retracted position, and the holding table is arranged in the cargo box section with the roof surface of the cargo box section sandwiched therebetween. An aerial work vehicle according to claim 2, 3, 4, 5 or 6, which is supported by a gate-shaped frame. 9. A jack device disposed on both sides of a rear portion of the front and rear jack devices, wherein the jack body is disposed in the packing box portion, and a lower end portion of the expansion / contraction portion or the jack body is formed from a bottom surface of the packing box portion. Claim 2, which is disposed through
The aerial work vehicle according to 3, 4, 5, 6, or 7. 10. The front and rear jack devices, wherein the jack devices arranged on both sides of the front portion are provided in a substantially V-shape so as to project inwardly and obliquely downward from a side surface of the vehicle body. The aerial work vehicle described in 1, 2, 3, 4, 5, 6, 7 or 8. 11. The bucket according to claim 1, wherein the bucket is composed of a lower frame and an upper frame connected to an upper portion of the lower frame, and the upper frame is foldable toward the lower frame. An aerial work vehicle according to 3, 4, 5, 6, 7, 8, 9 or 10. 12. The cover for covering the lower frame is provided on at least the lower frame of the bucket.
The aerial work vehicle described in 1. 13. The bucket has a lower frame whose peripheral surface is covered with a cover, an upper frame slidable upward and downward from the lower frame, and a state in which the upper frame is pulled out upward. And fixing means for fixing the upper frame by means of
The aerial work vehicle described in 7, 8, 9 or 10. 14. The upper frame is provided by inserting a vertical frame of the upper frame into a sliding member provided on the lower frame, and prevents a sudden drop of the upper frame between the vertical frame and the sliding member. The aerial work vehicle according to claim 13, wherein a sliding contact member is interposed. 15. An operating device, which is operable to operate at least a boom and a swing device, is rotatable on the bucket between a storage position arranged inside the bucket and a working position arranged outside the bucket. Claims 1 and 2 provided in
3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
Or the aerial work vehicle according to 14. 16. The bucket is provided with a detecting means for detecting whether or not the upper frame is at a work position protruding upward from the lower frame, and when the upper frame is placed at the work position by the detecting means. The aerial work vehicle according to claim 11, 12, 13, 14 or 15, wherein only each actuator is operable. 17. A boom position confirmation member is provided at a distal end portion of the base end boom, and when the boom is stored, at least a distal end portion of the base end boom disposed at the rear end of the vehicle is moved by the boom position confirmation member. Claims 1, 2, 3, 4, 5, 6, 7, 8, 9, 1 that can be confirmed by a driver.
The aerial work vehicle according to 0, 11, 12, 13, 14, 15, or 16.