KR0156091B1 - High lift work vehicle - Google Patents

Abstract

The aerial work vehicle which lowered the space of the relief boom in the height direction is started. The aerial work vehicle includes a vehicle 1, a relief boom 2, and a bucket 3. The boom 2 is provided with the base boom 21 rotatably attached to the upper end part of the turning device 6, and the front end boom 25 rotatably connected to the front end of the base boom 21. As shown in FIG. The base boom 21 includes a pair of boom members arranged in parallel at an interval. The base end 25 of the tip boom 25 is located between the pair of boom members. At the time of storage of the boom 2, the base boom 21 is positioned substantially horizontally above the vehicle 1, and the front end boom 25 is folded and opened on the base boom 21 side. The proximal end of the distal end boom 25 enters between a pair of boom members of the proximal boom 21.

Description

Aerial work vehicle

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

2 is a side view of a jack device disposed on both sides of the front of the vehicle.

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

4 is a side view showing a jack device disposed on both rear portions of a vehicle.

5 is a side view of a relief boom.

6 is a plan view showing a relief boom.

7 is a side view showing the horizontal holding means.

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

9 is a side view showing a bucket.

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

Figure 11 is a side view showing a bucket with the upper frame folded open.

12 is a perspective view showing a bucket covered with an outer edge of the cover.

13 is a hydraulic circuit diagram for operating the first and second cylinders.

14 is a front view showing jack devices arranged on both sides of the front of the vehicle.

15 is a plan view showing a bucket.

16 is a side view showing a bucket.

17 is a side view showing the bucket with the upper frame in the working position.

18 is a plan view showing an induction member equipped with a friction contact member.

FIG. 19 is a sectional view taken along the line A-A in FIG. 18. FIG.

20 is a partially enlarged view showing the engaging pin and the engaging hole constituting the fixing means.

21 is a side view showing a state where the rear boom positioning member of the aerial work vehicle is installed,

22 is a perspective view showing a boom positioning member.

23 is a side view showing the boom positioning member.

* Explanation of symbols for main parts of the drawings

1: vehicle 2: ups and downs boom

3: bucket 4,5: jack device

6 leveling means 12 bracket

21; Podium boom 22: bracket

23, 27: cylinder 25: tip boom

32: support pin 33, 34, 35, 36: frame

61,62,64,65: Sprocket 63,66: Chain

The present invention relates to an aerial work vehicle having a device for enabling work in a high place.

The aerial work vehicle disclosed in Japanese Patent Application Laid-Open No. 4-77593 includes a swing device mounted to allow the vehicle to swing, a base boom mounted to the swing device to perform a swing operation; A front end boom which is rotatably connected to the front end of the base boom and a bucket provided at the front end of the front end boom are provided.

In this type of aerial work vehicle, the tip boom is rotated toward the base boom centering on the connection point with the base boom in the state where the work is not performed. In the boom containment state, the front end boom and the proximal boom are arranged in parallel with each other and stand upward. Therefore, the height above the boom in the stored state becomes considerably large, and the vehicle may be subject to restrictions such as height restrictions. In addition, storing the boom in an upright position also has a problem in terms of stable running of the vehicle. In particular, in a one box type vehicle in which the driver's seat and the loading compartment are formed in an integral box shape, the boom is disposed on the cover of the vehicle, which makes the problem more present. It is also desirable to allow the work vehicle to simply and safely ride into the bucket.

An object of the present invention is to provide a height-lifting vehicle in which the height of a boom in a stored state is reduced and stable driving can be performed.

Another object of the present invention is to provide an aerial work vehicle that allows an operator to easily get on and off between a bucket and the ground.

Still another object of the present invention is to provide an aerial work vehicle capable of safely transporting a worker in a bucket to an aerial location.

It is still another object of the present invention to provide an aerial work vehicle that enables a worker in a bucket to perform aerial work safely.

The aerial work vehicle, which is a premise of the present invention, includes a swing device mounted to perform a swinging operation on a vehicle and a vehicle, a relief boom mounted to perform a swinging operation on the swinging device, a bucket mounted on the tip of the swing boom, It is provided with both the front and rear of a vehicle, and the jack apparatus for supporting a vehicle on the ground.

In the aerial work vehicle as described above, the present invention is characterized by the following matters,

The ups and downs boom is provided with the base boom rotatably supported by the turning device, and the tip boom rotatably supported by the front-end | tip part of the base boom. The proximal boom includes a pair of boom members arranged in parallel with open intervals. The base end of the tip boom is supported between the pair of boom members. The bucket is provided at the tip of the tip boom.

In the folded boom state, the base boom is located almost horizontally above the vehicle. The tip boom is located so as to overlap the base boom from above. The portion near the proximal end of the tip boom enters between the pair of boom members.

According to the aerial work vehicle having the above characteristics, the base boom extends almost horizontally, and the tip boom partially enters the base boom and is folded over the base boom so that the height of the relief boom during storage is considerably increased. It can be made small. In this way, the regulation such as the height limitation of the vehicle can be easily cleared, and stable running performance can be exhibited. This effect is particularly remarkable in a one box type vehicle in which the driver's seat and the loading compartment are formed in an integral box shape.

Preferably, the dimensions of the tip boom and the bucket are selected so that in a state where the base boom is positioned almost horizontally above the vehicle, only the tip boom is rotated to bring the bucket close to the ground to allow the operator to ride down. .

Preferably, the bucket lowered near the ground is capable of turning around the entire circumference of the vehicle by the swinging operation of the base boom. In this way, when unloading the substrate from the rear of the vehicle, the bucket can be placed at a place other than the rear of the vehicle, and the unloading of the substrate can be performed efficiently and I can get on and off easily. Moreover, even if an obstacle etc. exist in a part of the circumference | surroundings of a vehicle, it can respond easily.

In one preferred embodiment, the aerial work vehicle includes a first cylinder for performing the ups and downs of the base boom and a second cylinder for the rotation of the tip boom. Pilot check valves are arranged in the flow passage communicated to the piston seal side of the at least one cylinder and the flow passage communicated to the rod chamber side among the first and second cylinders. In this way, the expansion and contraction of the cylinder due to the inertia force when the cylinder is stopped can be suppressed, so that the boom moved by the expansion and contraction motion of the cylinder can be stopped exactly at a desired position. In addition, when the boom is stored, the boom can be easily positioned.

Preferably, the turning device, base boom and tip boom are configured as one unit. By uniting in this way, since it can be easily attached to various vehicles, it is excellent in versatility.

The aerial work vehicle according to the preferred embodiment includes a level holding means for always keeping the bucket in a horizontal state even during operation of the base boom and the tip boom. The horizontal holding means includes a first support pin rotatably supported at the distal end of the distal end boom, a second sprocket fixed to the first support pin and a second end for rotatably connecting the proximal end and the distal end boom. A second sprocket fixed to the support pin and a first chain wound around the first and second sprockets, a third sprocket integrally installed with the second sprocket and rotatably supported by the second support plate; A fourth sprocket rotatably supported via a third support plate at the proximal end of the base boom, and a second chain wound around the third and fourth sprockets. A bracket supporting the bucket is fixed to the first support pin.

In the embodiment having the above configuration, even when the base boom and / or the tip boom are in operation, the bucket is always kept in a horizontal state, so that the worker on the bucket can be safely transported to the height of the height.

Preferably, the boom member has a C-shaped cross-sectional shape. The third sprocket and the fourth sprocket are accommodated in the C-shaped boom member. In this way, the third and fourth sprockets can be easily and simply arranged.

Preferably, the aerial work vehicle includes an inverted U-shaped frame provided by being fixed in the storage compartment and a holding table supported by an inverted U-shaped frame with the roof surface of the storage compartment interposed therebetween. The holding table supports the base boom provided in the storage position stably from below.

Preferably, the jack device mounted on both sides of the rear of the vehicle includes a jack main body disposed in the loading compartment and an elastic part extending downward from the jack main body and penetrating the bottom surface of the loading compartment. do. In this way, when the elastic part is reduced, only the lower end of the elastic part or only the lower part of the jack body protrudes downward from the bottom surface of the loading compartment, and the elastic part or the like can protect them safely without interfering with other members. .

Preferably, the expansion and contraction portions of the jack device mounted on both sides of the front part of the vehicle are located inward from the side of the vehicle, and at the same time, the slant is bent downward so as to move away from each other. In this way, the jack device does not interfere with the headlights or direction indicators of the vehicle. In addition, since the ends of the expansion and contraction parts located on both sides are gradually inclined, the support range of the vehicle can be secured.

Preferably, the buckle has a lower frame and an upper frame installed on the lower frame. The upper frame is configured to fold on the lower frame side. In this way, when the work is not performed, the bucket can be stored with the height of the bucket lowered. In addition, the worker can easily and safely climb from the ground into the bucket at the same time.

Preferably, the bottom frame is covered from the outside by a cover. In this way, tools and the like do not fall to the periphery, and the aerial work can be safely performed.

In a preferred embodiment, the bucket has a lower frame covered with a covering around the upper frame, an upper frame supported by the lower frame to move upward and downward, and a state in which the upper frame is moved upward. And fixing means for fixing the position of the upper frame. In this way, the above frame can be easily moved to the work position, and the movement from the work position to the storage position can also be easily performed. When the operation is not performed, the bucket can be stored in a low state, and at the same time, the worker's climb from the ground to the bucket can be easily and safely performed.

In the above embodiment, preferably, the upper frame has a new frame extending in the vertical direction. The lower frame includes an induction member that receives the vertical frame so as to move upward and downward, and a friction contact member fixed to the guide member and preventing sharp drop of the upper frame by contacting the vertical frame with friction. .

Preferably, the aerial work vehicle includes an operation device for controlling the operation of the boom and the swing device. This operation device is supported by the bucket so that it can rotate between the storage position located in a bucket, and the working position located in the outer side of a bucket. When the aerial operation is not carried out, the operation device is stored in a bucket to protect the operation device. When carrying out the aerial operation, by placing the operation device on the outside of the bucket, it is possible to improve the workability in the bucket of the operator.

Preferably, the bucket is provided with detection means for detecting whether the upper frame is in the working position protruding upward from the lower frame. Only when the detecting means confirms that the upper frame is in the working position, the boom can be operated. By doing in this way, the fall of an operator from a bucket, etc. can be prevented reliably and the stability of a work can be improved.

Preferably, the tip portion of the base boom is provided with a boom positioning member that allows the driver of the vehicle to check the position of the tip portion of the base boom in a stored state from the driver's seat. When the driver reverses the vehicle, by checking the boom positioning member, the position of the tip portion of the long boom located at the rear of the vehicle can be grasped. Therefore, interference with a back obstacle or the like can be avoided. Moreover, at the time of running, since it is possible to recognize the position of a boom with respect to the driver of a following car, it becomes a preferable thing in terms of stability.

The aerial work vehicle shown in FIG. 1 includes a vehicle 1, a relief boom 2, and a bucket 3 attached to the tip of the relief boom 2. The vehicle 1 is a so-called one box type car in which the loading compartment 1a and the driver's seat 1b are formed in an integral box shape.

The jack device 4 is provided in the front part of the vehicle 1, and the jack device 5 is provided in the back part. The jack devices 4 and 5 support the vehicle 1 stably on the ground during the height work, and each has a stretchable portion extending downward.

As shown in FIG. 2 and FIG. 3, the jack device 4 is provided in the apparatus member 42 provided extending in the front direction from the front end of the vehicle body 11 of the vehicle 1. As shown in FIG. The device member 42 includes a bracket 12 fixed to the left and right sides of the front end of the vehicle body frame 11 and a pair of left and right projecting edges 42a and 42a that protrude horizontally forward from the bracket 12. And a device border 42b extending in the width direction of the vehicle 1 across the tip of the protruding edges 42a and 42a. Device portions 42c are provided at both ends of the device border 42b. The jack device 4 is supported by the device portion 42c so as to extend in the vertical direction.

As shown in FIG. 2, the jack device 4 has the expansion-contraction part 4a extended downward. At the lower end of the stretchable portion 4a, a support member 4b is provided. When the expansion and contraction portion 4a extends downward at the height of working, the support member 4b reaches the ground and supports the vehicle 1. As shown in this embodiment, the jack device 4 is arranged in a state of being extended in front of the vehicle 1, so that the support range of the vehicle 1 by the jack device 4 and the jack device 5 can be largely secured. It is possible to further support the vehicle 1 stably.

As shown in FIG. 2, the front bumper 13 is disposed in front of the device member 42. Since the device member 42 (particularly, the device border 42b also plays a role as a reinforcing material of the front bumper 13), together with the front bumper 13, the vehicle 1 can be protected from an impact from the front due to an accident or the like. Can be.

As shown in FIG. 4, the jack device 5 is arrange | positioned vertically on the both sides of the rear part of the vehicle 1, with the expansion-contraction part 5a facing down. The jack main body 5b of the jack device 5 is disposed in the loading compartment 1a constituting the rear part of the vehicle 1. The elastic part 5a extends through the bottom surface of the storage compartment 1a. A support member 5c is provided at the lower end of the stretchable portion 5a. When the expansion and contraction portion 5a extends downward at the height of working, the support member 5c contacts the ground and supports the vehicle 1. In this embodiment, only the expansion and contraction portion 5a of the jack device 5 penetrates the bottom surface of the loading compartment 1a, but the lower end of the jack main body 5b of the jack device 5 is formed of the loading compartment 1a. You may make it penetrate the bottom surface.

The boom 2 includes the base boom 21 and the tip boom 25. The base end of the boom 21 is a turning device 2a mounted in the loading compartment 1a of the vehicle 1. Is supported rotatably via the bracket 22 at the upper end of the. The swinging device 2a is provided so as to be able to swing in the horizontal direction by drive means such as the hydraulic motor 104 (see FIG. 13). As shown in FIG. 1, the upper end part of the turning device 2a has escaped the cover surface of the loading container part 1a.

One end of the first cylinder 23 is connected to the bracket 22 and the other end is connected to the base boom 21. The first cylinder 23 allows the base boom 21 to be inclined.

As shown in FIG. 6, the relief boom 21 includes a pair of boom members 21a and 21a which are arranged in parallel at intervals. The proximal end of the distal end boom 25 is rotatably supported between the distal end portions of the pair of boom members 21a and 21a via a pin 26.

As shown in Fig. 8, the boom members 21a and 21a each have a C-shaped cross section and are arranged to face the open hole portions to each other. The sprocket 64 of the horizontal holding means 6 mentioned later is accommodated in the boom members 21a and 21a which hold C-shaped cross section.

With reference to FIG. 1 and FIG. 5, the 2nd cylinder 27 and the operation link 28a, 28b are interposed between the base boom 21 and the tip boom 25. FIG. The tip boom 25 rotates around the connection point with the base boom 21 by the expansion | contraction operation of the 2nd cylinder 27. As shown in FIG.

At the time of storage of the boom 2, as shown in FIG. 1, the base boom 21 is positioned so that it may be substantially horizontal from the upper side of the vehicle 1. As shown in FIG. The tip boom 25 is folded on the base boom 21 side from above. At this time, the proximal end of the distal end boom 25 is dug in between the distal end of the proximal boom 21. On the rear upper surface of the loading compartment 1a, a holding table 15 for supporting the relief boom 2 at the storage position from below is provided. The holding table 15 is supported by an inverted U-shaped frame 16 mounted in the loading box 1a with the low roof surface of the loading box 1a in consideration of the rigid surface. have. When holding the relief boom 2 by the holder 15 from below, it is necessary to select the device position, the dimensional relationship, etc. of each element so that the holder 15 does not interfere with peripheral devices such as the cylinder 27. There is.

The bracket 31 is attached to the tip of the tip boom 25. This bracket 31 maintains the posture extended in the vertical direction. The bucket 3 is fixed to the bracket 31. 5 and 6, the support pin 32 is rotatably supported at the tip of the tip boom 25. The bracket 31 is integrally attached to this support pin 32.

The bucket 3 fixed to the bracket 31 is comprised by the horizontal holding means 6 so that a horizontal posture may be always maintained, even during operation of the base boom 21 and the tip boom 25.

With reference to FIG. 7, the horizontal holding means 6 is the 1st sprocket 61 integrally installed in the support pin 32, and the 2nd provided in the pin 26 located in the front-end | tip of the base boom 21. In FIG. The sprocket 62, the first chain 63 wound between the first and second sprockets 61 and 62, the third sprocket 64 provided at the outer end of the pin 26 and the base boom ( And a fourth sprocket 65 integrally provided on the pin 29 at the proximal end of 21), and a second chain 66 wound around the third and fourth sprockets 64 and 65. As shown in FIG. As shown in FIG. 8, the second sprocket 62 and the third sprocket 64 are integrally formed, and the integrated sprocket 62 is rotatable to the pin 26 via the bearing 67. Is supported. The 3rd sprocket 64 and the 4th sprocket 65 are arrange | positioned in the state accommodated in the boom member 21a. Therefore, these sprockets can be easily and simply arranged using the boom member 21a.

With the ups and downs of the base boom 21 and the rotation of the tip boom 25, the first, second, third and fourth sprockets 61, 62, 64, 65 rotate correspondingly, respectively. Their rotation is transmitted to the bracket 31 via the first and second chains 63 and 66. In this way, the bucket 3 always maintains a horizontal posture.

Referring to FIG. 9, the bucket 3 has a lower frame 33 woven into a substantially cuboid shape, and an upper frame 34 connected to an upper portion of the lower frame 33. The upper frame 34 includes four vertical frames 35 extending upwardly from the upper edge of the lower frame 33 and a rectangular frame 36 installed to connect the upper ends of the vertical frames 35. Include.

As shown in FIG. 10, the vertical frame 35 is provided with the lower member 35a, the upper member 35b, and the connection member 35c. The connecting member 35c and the lower member 35a are rotatably connected by the pin 37a. The connecting member 35c and the upper member 35b are rotatably connected by the pin 37b. In the height work, the lower member 35a, the connecting member 35c, and the upper member 35b are arranged to be aligned in a straight line in the vertical direction, and this alignment state is fixed by the fixing means 37. When the fixing by the fixing means 37 is released, the upper frame 34 can be folded to the lower frame 33 side as shown in FIG.

The fixing means 37 is comprised as the fixing member 37c extended so that the pin 37a, 37b mentioned above and these pin 37a, 37b may be fitted. A groove portion 37d is formed in the fixing member 37c. By inserting and fixing the pins 37a and 37b in the groove portion 37d, the lower member 35a and the upper member 35b can be stably fixed in a state in which they are aligned in a straight line. On the other hand, when the fixing member 37c is pulled upward from the pins 37a and 37b, the vertical frame 35 can be folded and opened.

The length of the boom 2 is selected suitably so that the following operation | movement may be achieved. That is, in the state where the base boom 21 is arrange | positioned substantially horizontally from the upper side of the vehicle 1, only the front end boom 25 is rotated and this front boom 25 is moved to the substantially vertical state from the rear of the vehicle 1 Take it to the right place. In this state, the bucket 3 provided at the tip of the tip boom 25 is located near the ground. In addition, when the base boom 21 is rotated while the bucket 3 is located near the ground, the length of the base boom 21 is set so that the bucket 3 can turn the vehicle 1 without any interference around it. Is selected.

By the operating device 7 arranged on the vehicle 1 side, it is possible to operate each operation of the swinging device 2a and the undulating boom 2. Moreover, it is possible to control the operation of the turning device 2a and the undulation boom 2 also by the operation device 8 mounted to the bucket 3.

Referring to FIG. 11, the operating device 8 mounted on the bucket 3 includes a storage position (indicated by a merchant ship) located in the bucket 3, and a work position located outside the bucket 3 ( It is provided via the arm 81 in the rectangular frame 36 of the upper frame 34 so that it may rotate between the position shown by a solid line. This operating device 8 is stably held by a stopper (not shown) at both the storage position and the work position.

FIG. 13 shows the hydraulic circuits of the first cylinder 23 for causing the base boom to operate and the second cylinder 27 for causing the tip boom to operate. The switching valves 101, 102 and 103 are configured to switch valve positions by operation by the operation switch or operation lever of the operation device 7 or 8 described above. The hydraulic oil discharged from the pump P is supplied to the hydraulic motor 104, the first cylinder 23, and the second cylinder 27 via the switching valves 101, 102, 103. Pilot check valves 107 and 108 are disposed in the flow path 105 communicated to the piston seal 23a side of the first cylinder 23 and the flow path 106 communicated to the rod seal 23b side. The pilot check valve 107 guides the pilot pressure from the opposite flow path 106 and opens the flow path 105 when the inside of the flow path 106 reaches a predetermined pressure. Similarly, the pilot check valve 108 induces pilot pressure from the opposite flow path 105, and opens the flow path 106 when the inside of the flow path 105 reaches a predetermined pressure.

As described above, the pilot check valves 107 and 108 are provided in the flow paths 105 and 106, and the first cylinder 23 continues to move due to the inertia force when the expansion and contraction operation of the first cylinder 23 is stopped. In other words, it is possible to suppress the movement by the inertial force of the base boom 21.

In the same manner, pilot check valves 112 and 113 are also disposed in the flow path 110 communicated with the piston chamber 27a of the second cylinder 27 and the flow path 111 communicated with the rod chamber 27b. Therefore, when the expansion and contraction operation of the second cylinder 27 is stopped, the second cylinder 27 continues to operate by the inertia force, that is, the tip boom 25 can be suppressed from moving by the inertia force.

Next, the operation of the aerial work vehicle will be described.

When performing a height operation, the vehicle 1 is moved to a work place and parked. Thereafter, the jack devices 4 and 5 are operated to lower the supporting members 4b and 5c of the expansion and contraction parts 4a and 5a to the ground, and stably support the vehicle 1.

Next, as indicated by the imaginary line in FIG. 1, the front end boom 25 is rotated to a position which becomes almost vertical at the rear of the vehicle 1, thereby bringing the bucket 3 close to the ground. Bring it to the lowest position. After the operator climbs into the bucket 3 in a state where the upper frame 34 is folded, the upper frame 34 is extended upward to fix the position of the upper frame by the fixing means 37. In this manner, the worker climbs into the bucket 3 in the state in which the upper frame 34 is folded, so that the worker can safely climb into the bucket 3 from the ground.

When it is not desirable to arrange the bucket 3 behind the vehicle 1 for loading or unloading the substrate from the loading compartment 1a, the front end boom 21 is pivoted in advance to a small turning position before the tip. The boom 25 is rotated as described above. In this way, the worker can get in the bucket 2 from anywhere around the vehicle 1. This work is effective even when some obstacles or the like exist around the vehicle 1 at the work place.

The operator aboard the bucket 3 rotates the operating device 8 from the storage position to the work position. In the working position, the operating device 8 is located outside the bucket 3. The operator rotates the turning device 2a by the operating device 8 and controls the up and down movement of the base boom 21 and the rotation operation of the tip boom 25. By this control, the bucket 3 provided at the tip end of the tip boom 25 is moved to the height position, and a desired height operation is performed.

The bucket 3 is always kept in the horizontal state by the horizontal holding means despite the operation of the base boom 21 and the operation of the tip boom 25, so that the worker who is in the bucket 3 can be safely brought to a height of height. I can transport it. In addition, when the operation device 8 does not perform the height operation, it is stored in the storage position in the bucket 3, and it is made to protect it from the impact from the outside. The movement of the turning device 2a and the boom 2 can be controlled by the operating device 8 provided in the bucket 3, but in addition to that. It is also possible for separate operators to control their movements by the operating device 7 installed in the vehicle 1.

When the work at the height is finished, the operating device 8 is operated to move the bucket 3 to the storage state as shown in FIG. 1. In this storage state, the tip boom 25 The proximal end of the proximal end is positioned to dig between the proximal end of the proximal boom 21. Moreover, since the base boom 21 is located in substantially horizontal state, the space of the relief boom 2 in the height direction can be restrained to the minimum. This work is particularly effective for one box type vehicles.

As described above, the ups and downs of the base boom 21 are controlled by the first cylinder 23 and the rotations of the front boom 25 are controlled by the second cylinder 27. Since the pilot check valves 107, 108, 112, and 113 are arranged in the flow path of the hydraulic oil communicating with these cylinders, when the supply of the hydraulic oil to each flow path is stopped, the pressure in the corresponding flow path decreases, and the corresponding pilot check valve is closed. Therefore, when the operation of the first cylinder 23 and the second cylinder 27 is stopped, expansion and contraction of the cylinder rod due to the inertia force can be suppressed. In other words, it is possible to stop the base boom 21 and the tip boom 25 exactly at a desired position. Therefore, the base boom 21 and the tip boom 25 can be easily positioned. In particular, in the case where the relief boom is mounted on the roof of the vehicle 1 as in the illustrated embodiment, it is convenient because the base boom and the tip boom can be easily and accurately positioned at predetermined positions on the lid.

The bucket 3 shown in FIG. 12 is provided with the lower frame 33 and the upper frame 34, and the cloth cover 9 which covers the circumference | surroundings of this upper part frame. The opening in which the upper surface of the bucket 3 is opened is made to be opened and closed by the cover member 91 made of cloth holding a fastener 92. Thus, when the circumference | surroundings of the lower frame 33 and the upper frame 34 are covered with the cloth cover 9, it is preferable for safety, if the tool etc. brought in the bucket 3 do not fall to sub-circumference. Moreover, the worker who got in the bucket 3 can also carry out the aerial work in peace.

In the illustrated embodiment, although both the lower frame 33 and the upper frame 34 are covered with the cloth cover 9, the lower frame 33 is covered with only the cloth cover without covering the upper frame 34. Does not matter.

In the above-described embodiment, the one-box type vehicle 1 is provided with a relief boom 2, a bucket 3, and the like. The vehicle 1 is not limited to the one-box type but can also apply the present invention to various vehicles such as tracks. At this time, if the base boom 21, the tip boom 25, the turning device 2a, the bucket 3, and the operating device 7, 8, etc. are unitized, the mounting on the vehicle 1 can be performed easily. have.

14 shows an example of a jack device arranged at the front of the vehicle. This jack device 4 is attached to both front ends of the vehicle body frame 11 positioned inward from both side surfaces of the vehicle 1 via the brackets 45. These two jack devices 4, 4 are arranged so that the obliquely extending downwards away from each other. Therefore, the expansion and contraction portions of the jack devices also protrude downward.

Since the jack device 4 at the front of the vehicle is provided at both ends of the front bumper of the vehicle 1, that is, the front end of the vehicle frame 11 protrudes from both sides of the vehicle frame 11, i.e. The range can be secured widely and the vehicle 1 can be supported in the most stable state. However, if the jack device 4 is disposed from both sides of the body frame 11 in the state protruding from both sides, the vehicle body 11 may be easily warped when the jack device 4 supports the vehicle 1. The problem arises. This distortion is particularly problematic in the front end portion in which the strength reduction of the vehicle body frame 11 cannot be denied. Since both headlights and direction indicators are provided on both sides of the front surface of the vehicle 1, it is also necessary to consider that the jack device does not interfere with these devices.

Therefore, in the illustrated embodiment, the jack device 4 is disposed in the area located inside the vehicle 1 rather than on both surfaces thereof, and in an area where the headlight or the like is not disturbed. In addition, when the vehicle is supported by the jack device 4, the bottom of each jack device 4 is inclined outward so that the space between the jacks 4 can be large, so that the distance between each other gradually decreases. By arranging the jack device 4 in a state inclined downward as described above, the grounding member 46 grounds only the inclined portion to the ground without causing the jack device 4 to protrude in both directions. The area can be secured widely.

15 to 17 show another example of the bucket. The bucket 3 shown in figure shows the lower frame 301, the upper frame 302 provided so that the lower frame 301 can move up and down, and this frame 302 from the lower frame 301. And fixing means 301 for fixing the upper frame 302 in the upwardly lifted position. The periphery of the lower frame 301 is covered with the cover 301a.

The upper frame 302 includes a plurality of vertical frames 303 and a spherical horizontal frame 304 connecting the upper ends of these vertical frames 303. Each vertical frame 303 is accepted to move in a contact state in the guide member 305 provided in the lower frame 301. In addition, of the four vertical frames 303, the two are connected to the lower end thereof to form a U-shape.

The guide member 305 is formed in the shape of a tube having a rectangular cross section, as shown in FIG. The induction member 305 is equipped with a friction contact member 306. As shown in FIG. 19, the frictional contact member 306 is comprised from the flat plate in which the upper and lower ends were deflected in the shape of a hook. Positioning of the friction contact member 306 is performed by inserting the upper and lower ends of the friction contact member 396 into the member which comprises the guide member 305. As shown in FIG. Since the frictional contact member 306 is in contact with the surroundings of the vertical frame 303 as a frictional force, it is possible to prevent the sudden drop of the upper frame 302.

The fixing means 301 is attached to and detached from the fixing pin 311 provided on the upper frame 302, the fixing hole 312 provided on the lower frame 301 (see FIG. 20), and the fixing pin 311. And an actuating member 313. The fixing pin 311 and the fixing hole 312 are in contact with each other when the upper frame 302 protrudes upward.

The operation member 313 is connected to the operation lever 314 and the operation lever 314 installed on the horizontal frame 304 of the upper frame 302, and attaches and detaches the fixing pin 311 to the fixing hole 312. And an actuating rod 315 and an actuating link 316. The operation rod 315 and the operation link 316 are appropriately configured so that the fixing pin 311 is separated from the fixing hole 312 when the operator holds the operation lever 314. Normally, the force is increased in the direction fixed to the fixing hole 312 by the force which increases the force of the spring which the fixing pin 311 which is not shown in figure.

In the bucket 3 configured as described above, the upper frame 302 is moved upward from the lower frame 301 to the working position, and the fixing pin 311 is moved in relation to the fixing hole 312. By joining, the frame 302 is kept stable at the working position. When returning the upper frame 302 from the working position to the storage position, the fixing pin 311 is removed from the fixing hole 312 by the operating lever 314 via the operating rod 315 and the operating link 316. By separating, the upper frame 302 can be stored on the lower frame 301 side. At this time, the upper frame 302, while rubbing in contact with the friction contact member 306 by the frictional force to move downwards can be safely moved to the storage position without falling.

The bucket 3 is provided with a detector 320 such as a limit switch. The detector 320 holds the detector 321, as shown in FIG. The detector 321 abuts against the tip of the fixing pin 311 when the fixing pin 311 joins and fixes the fixing hole 312. The detector 320 detects a state in which the upper frame 302 is disposed at the working position, and only when the upper frame 302 is disposed at the working position, the relief boom 2 is controlled by a control system of an electric circuit (not shown). It is possible to operate the respective actuators for operating the actuator. In this way, the operation of the ups and downs boom is possible only when the detector 302 confirms that the upper frame 302 is in the working position, thereby ensuring that the worker falls from the bucket 3 composed of the upper and lower two frames. It can prevent and can improve work stability.

The detector is not limited to the type that abuts on the fixing pin 311 as described above, but may be the type that abuts on the vertical frame 303 disposed at the work position. It is also possible to detect that the upper frame is disposed at the storage position, and determine that the upper frame is at the working position by detecting that the upper frame is not at the storage position.

21 to 23 show the aerial work vehicle of another embodiment. The same members as the aerial work vehicle of the above-described embodiment are denoted by the same reference numerals and the description thereof is omitted.

The aerial work vehicle shown in FIGS. 21-23 is equipped with the boom position confirmation member 400 in the front-end | tip of the relief boom 21. FIG. The boom positioning member 400 is suspended in the vertical direction via the connecting member 401 through the operation link 28a disposed at the distal end of the base boom 21. The rod end 27c of the second cylinder 27 is connected to this connecting member 401. Therefore, the 2nd cylinder 27 operates the operation link 28a via the connection member 401, and has rotated the front boom 25 by this.

As shown in FIG. 22 and FIG. 23, the boom positioning member 400 is formed as a plate-like body having flexibility such as rubber. The proximal end is fixed to the connecting member 401 via a screw 402. As shown in this way, the boom positioning member 400 has a predetermined length downward from the distal end of the proximal boom 21. It becomes suspended.

The length of the boom positioning member 400 suspended from the tip end of the base boom 21 is set to a size such that the driver of the vehicle can check the position of the tip end of the base boom from the driver's seat when the relief boom 2 is stored. have. In addition, when the boom positioning member 400 is colored with a fluorescent color or the like, the driver can easily see. When the driver reverses the vehicle 1, the driver can check the position of the front end portion of the base boom 21 located at the rear of the vehicle 1 while checking the boom positioning member 400, so that the rear obstacle and the like. Interference can be avoided. In addition, when driving, the driver of a subsequent vehicle can recognize the position of the ups and downs boom 2, and safety driving is attained.

Claims (18)

A swivel device mounted to the vehicle and the vehicle to make a swivel operation, a boom boom mounted to the swivel device to perform a swivel operation, a bucket mounted to the tip of the swivel boom, and attached to both front and rear of the vehicle In the aerial work vehicle provided with a jack device for supporting the vehicle on the ground, the relief boom is a base boom that is rotatably supported by the turning device, and a tip boom rotatably supported by the tip portion of the base boom; And the proximal boom includes a pair of boom members arranged in parallel with open intervals, wherein the proximal end of the proximal boom is supported between the pair of members, and the bucket is the proximal boom. And the proximal boom is positioned substantially horizontally above the vehicle, and the proximal boom overlaps the proximal boom from an upper side in the state where the boom is folded. To be located at the same time, Aerial Work Platform, characterized in that the boom into between members of the portion close to its base pairs. The aerial vehicle according to claim 1, wherein the vehicle is a one-box type vehicle in which a driver's seat and a loading box are formed in an integral box shape. The front boom and the front boom of claim 1, wherein the base boom is positioned almost horizontally above the vehicle, wherein the front boom is pivoted so that the bucket is brought to the ground to allow the worker to ride down. Aerial work vehicle, characterized in that the dimensions of the bucket is selected. The aerial vehicle according to claim 3, wherein the bucket lowered to the ground is capable of turning around the entire circumference of the vehicle by the pivoting operation of the base boom. 2. The piston seal according to claim 1, further comprising: a first cylinder for causing the base boom to be undulated, and a second cylinder for causing the tip boom to rotate, wherein at least one cylinder of the first and second cylinders is provided. An aerial work vehicle comprising a pilot check valve disposed in a flow passage communicating with a side and a flow passage communicating with a rod chamber. The aerial work vehicle according to claim 1, wherein the turning device, the base boom, and the tip boom are configured as one unit. 2. The apparatus of claim 1, further comprising horizontal holding means for always maintaining the bucket in a horizontal state even during operation of the base boom and the tip boom, wherein the horizontal holding means is rotatably supported at the distal end of the tip boom. A first sprocket fixed to the first support pin, a second sprocket rotatably supported by a second support pin rotatably connecting the proximal boom and the tip boom, and the first sprocket; A first chain wound around a second sprocket, a third sprocket integrally installed with the second sprocket and rotatably supported by the second support pin, and a third support pin at a proximal end of the base boom. And a second sprocket, which is rotatably supported by the second sprocket, and a second chain which is wound around the third and fourth sprockets, and which supports the bucket, is fixed to the first support pin. Aerial Work as. 8. The aerial work vehicle according to claim 7, wherein the boom member has a C-shaped cross-sectional shape and the third sprocket and the fourth sprocket are housed in the C-shaped boom member. According to claim 2, Inverted U-shaped frame fixedly installed in the loading compartment, and holding the supporter supported by the inverted U-shaped frame sandwiched between the cover surface of the loading compartment, the holding table, An aerial work vehicle comprising the base boom brought to a storage position from below. According to claim 2, The jack device mounted on both sides of the rear of the vehicle, the jack body disposed in the loading compartment and the expansion and contraction extending downward from the jack body and penetrating the bottom surface of the loading compartment; Aerial work vehicle comprising a. The aerial work vehicle according to claim 2, wherein the jack-mounted telescopic parts mounted on both sides of the front part of the vehicle are located inward of the side of the vehicle and extend obliquely downward to be far from each other. The aerial vehicle according to claim 1, wherein the bucket has a lower frame and an upper frame installed on the lower frame, and the frame is configured to be folded on the lower frame. 12. The aerial vehicle according to claim 11, further comprising a cover for covering the lower frame from the outside. 2. The bucket according to claim 1, wherein the bucket comprises: a lower frame covered with a covering around the upper frame; an upper frame supported by the lower frame to move in contact with each other in the vertical direction; and the upper frame moved upwards. Aerial work vehicle characterized in that it comprises a fixing means for fixing the position of the upper frame in a state. 15. The guide frame according to claim 14, wherein the upper frame includes a vertical frame extending in the vertical direction, and the lower frame includes an induction member for receiving the vertical frame in a contact state in a vertical direction so as to be movable. And a frictional contact member which is fixed and at the same time prevents a sharp fall of the frame by contacting the frame with frictional force. The apparatus according to claim 1, further comprising an operation device for controlling the operation of the boom and the swing device, wherein the operation device is provided between a storage position located in the bucket and a work position located outside the bucket. Aerial work vehicle, characterized in that supported by the bucket to be rotated in. 13. The bucket according to claim 12, wherein the bucket has detection means for detecting whether the upper frame is in a working position protruding above the lower frame, and wherein the upper frame is in the working position by the detecting means. Aerial work vehicle, characterized in that the operation of the relief boom only when confirmed. The aerial work vehicle according to claim 1, wherein the tip of the base boom is provided with a boom positioning member that allows the driver of the vehicle to check the position of the tip of the base boom in a stored state from the driver's seat. .