JP2007001354A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve such a problem that rear wheels supported by front and back rollers and front wheels, and traveled and driven may be floated in the air without contacting the ground, so that they cannot be traveled or driven, when the rear wheels are positioned at the indentation of the ground and the front and back rollers and the front wheels are positioned at the indentation at the time of operation while bringing four roller jacks on the ground and moving the vehicle. <P>SOLUTION: A working vehicle is mounted on a vehicle 1, and four outriggers 4 providing with ground plates 5 at bottom ends and supporting the working vehicle on the ground are arranged at front, back, right and left positions of the vehicle. Rollers 6 can be arranged only on two front outriggers 4a instead of the ground plates 5, and the ground plate 5 of the respective outrigger 4 is brought into contact with the ground, so as to support the working vehicle. When the operation is done while the working vehicle is traveling, the roller 6 is arranged on the bottom end of the outrigger 4a, and only the outrigger 4a is pulled out within a range not to float the front wheels 2, and the working vehicle is supported on the ground by the roller 6, so as to drive and travel the vehicle 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a work vehicle having a work machine mounted on the vehicle.

  Examples of this type of work vehicle include an aerial work vehicle, a bridge inspection vehicle, and a crane vehicle. When these work vehicles work at a stop position, they are lifted from the ground by an outrigger, and the work is supported on the ground. In this case, since the vehicle is supported on the ground by the outrigger, the working range can be widened, but the vehicle cannot move because the ground plate of the outrigger is in contact with the ground. On the other hand, when working over a long range such as overhead wire construction, tunnel inner surface construction or bridge inspection, it is necessary to move the vehicle sequentially, but when only wheels are grounded, the vehicle is affected by the elasticity of the suspension and wheels (tires) Sway elastically. In particular, in an aerial work vehicle or a bridge inspection vehicle, the work table easily shakes, making the work difficult to perform or making the ride uncomfortable.

Therefore, conventionally, work vehicles have been known in which jacks with rollers are arranged at four positions on the front, rear, left and right of the vehicle body, and the rollers are grounded together with the wheels at the lower end of each jack so that the work can be performed sequentially while moving the vehicle. It is. (For example, see Patent Document 1)
JP 2000-118367 A (page 3 to page 4, FIG. 1, FIG. 3, FIG. 4)

By the way, the roller-equipped jack includes a jack base that is attached to the lower end of the roller-equipped jack and has a grounding plate that can be grounded instead of the roller. The jack base is swung between a plate installation position where the ground plate covers the lower surface of the roller and a retracted position where the lower surface of the roller is exposed. That is, the roller-equipped jack is configured such that the ground plate is grounded to the ground at the plate installation position and the vehicle is operated at the stop position, and the roller is grounded to the ground and the vehicle is moved at the retracted position. .

  However, when working with the roller grounded to the ground and moving the vehicle with this roller-equipped jack, if the rear wheel is located in the concave and the front and rear rollers and the front wheel are located in the convex if the ground is uneven The work vehicle may be supported by front and rear rollers and front wheels, and the rear wheels may not be in contact with the ground and may float in the air in the recesses. Usually, the rear wheel is a wheel for driving the work vehicle to run, and the rear wheel is idling. Therefore, the work vehicle may not be able to be driven at this time.

  An object of this invention is to provide the work vehicle which can prevent such a thing as much as possible.

  In order to achieve the above object, a work vehicle according to claim 1 of the present invention includes an outrigger in which a work machine is mounted on the vehicle, and a grounding plate is provided at each of the front, rear, left, and right positions at the lower ends and the work vehicle is supported on the ground. 4 are arranged, and only the two outriggers arranged in the front can be arranged with rollers instead of the ground plate provided at the lower end, and when the work vehicle is operated at the stop position, the front and rear four outriggers are arranged. When the work vehicle is supported by grounding the grounding plate to the ground and the work vehicle is running, a roller is disposed at the lower end of the two outriggers in the front, and only these two outriggers do not lift the wheels. The overhanging work vehicle is supported on the ground by a roller and the vehicle is driven to run.

  According to a second aspect of the present invention, the work vehicle includes a work machine mounted on the vehicle, and includes four outriggers that are each provided with a grounding plate at the lower end at the front, rear, left, and right positions of the vehicle to support the work vehicle on the ground. Two roller jacks with rollers at the lower end are arranged only between the outrigger and the front wheel, and when working the work vehicle at the stop position, the grounding plates of the four front and rear outriggers are grounded to the ground. When the work vehicle is run while being supported, the two roller jacks are extended to the extent that the wheels are not lifted so that the work vehicle is supported on the ground by a roller and the vehicle is driven to run. To do.

  According to a third aspect of the present invention, the work vehicle according to the second aspect is characterized in that the roller jack is disposed obliquely so that the roller comes close to the front wheel as it extends.

  A work vehicle according to a fourth aspect of the present invention is the work vehicle according to any one of the first to third aspects, wherein the work machine includes a swivel capable of swiveling at a rear position of the loading platform of the vehicle and a boom attached to the swivel. It is characterized by being.

  The work vehicle according to the first aspect of the present invention enables a roller to be arranged in place of the ground plate provided at the lower end only for the two outriggers arranged in the front, and when working while the work vehicle is traveling, the front 2 Since a roller is arranged at the lower end of the base outrigger and only the two outriggers are extended so that the wheels are not lifted, the working vehicle is supported on the ground by the roller and the vehicle is driven to run. Even if the ground is uneven, the load on the rear part of the work vehicle supports the vehicle only with the rear wheels (there is no jack with roller at the rear part). Therefore, even if the rear wheel is positioned in the concave portion, the rear wheel does not float in the air in the concave portion and does not idle, and the work vehicle does not stop traveling. In addition, since the rollers can be arranged in place of the ground plate provided at the lower end only in the two outriggers arranged in the front, the work vehicle is compared with the case where the jacks with rollers are arranged separately from the front outriggers. Can be manufactured at a low cost.

  According to a second aspect of the present invention, there is provided a work vehicle according to the present invention in which two roller jacks each having a roller at the lower end are disposed only between an outrigger disposed in front and a front wheel. The two roller jacks are extended so that the work vehicle is supported on the ground by the rollers and the vehicle is driven to travel, so that even if the ground when traveling is uneven, The rear load only supports the vehicle with the rear wheels (no roller jacks are arranged at the rear). Therefore, even if the rear wheel is positioned in the concave portion, the rear wheel does not float in the air in the concave portion and does not idle, and the work vehicle does not stop traveling. In addition, since only two roller jacks are arranged at the front, the weight of the work vehicle can be reduced as compared with the case where a roller jack is arranged at the rear separately from the front roller jack, and at a low cost. Can be manufactured at cost.

  Furthermore, the work vehicle according to the third aspect of the present invention is such that the roller jack is arranged obliquely so that the roller comes close to the front wheel as it extends, and the ground when running is uneven and the front wheel is located in the recess. However, since the roller is brought close to the front wheel and the vehicle is not supported by the roller jack as much as possible, the front wheel will not float in the air in the recess and will not spin, making it impossible to steer the work vehicle Can be prevented.

  Next, a work vehicle according to a fourth aspect of the present invention is the work vehicle according to any one of the first to third aspects, wherein the work implement is a swivel turnable to a rear position of the loading platform of the vehicle, and a boom attached to the swivel. It is configured with. Therefore, when working while driving a work vehicle supported by rollers arranged in front, the boom is generally directed forward, so the distance between the turning center and the rollers can be separated. The working range of the working machine can be widened.

Embodiments of a work vehicle according to the present invention will be described below with reference to FIGS.
1 to 4, the work vehicle includes a pair of left and right front wheels 2 that can be steered by the vehicle 1 and a pair of left and right rear wheels 3 that are driven to rotate by an engine mounted on the vehicle 1. ing. Four outriggers 4 each having a grounding plate 5 at the lower end and supporting the work vehicle on the ground are arranged at front, rear, left and right positions of the vehicle 1. The outrigger 4 is directly attached to an arm (not shown) in which a jack 30 described below is fixed to the frame of the vehicle 1. The jack 30 includes an outer cylinder 31, an inner cylinder 32 fitted in the outer cylinder 31 so as to be extendable and contracted, and a hydraulic cylinder 33 that drives the inner cylinder 32 to extend and contract with respect to the outer cylinder 31 between the outer cylinder 31 and the inner cylinder 32. And the grounding plate 5 fixed to the lower end of the inner cylinder 32. The jack 30 may be directly attached to the arm fixed to the frame of the vehicle 1 as described above, but the arm 30 can be extended and retracted so that the jack 30 can be advanced and retracted in the width direction of the vehicle 1. Also good.

  The roller 6 can be arranged in place of the ground plate 5 provided at the lower end only in the two outriggers 4a arranged in front of the outrigger 4 arranged in the work vehicle. As shown in FIG. 2, the roller 6 is supported by two inner and outer holding arms 62 and 62 at the lower end portion of the inner cylinder 32 in the vehicle front side of the jack 30 so as to be able to turn up and down. That is, both ends of the shaft 61 of the roller 6 are supported by the distal ends of the holding arms 62 and 62, and the base ends of the holding arms 62 and 62 are pivotally supported by the pivot 63 on the inner and outer surfaces of the lower end of the inner cylinder 32. Thus, the holding arms 62 and 62 and the roller 6 can be turned up and down around the pivot 63.

  As shown in FIG. 4, the roller 6 has an upward movement position where the lower surface of the roller is higher than the lower surface of the ground plate 5 and a downward movement position where the lower surface of the roller is lower than the lower surface of the ground plate 5 as shown in FIG. Position holding means for holding each position is provided. As this holding means, a fixing method using a lock pin 71 is adopted.

  That is, as shown in FIG. 2, two brackets 72, 72 with pin holes are provided on the vehicle front side surface of the lower end portion of the inner cylinder 32, and one lock pin 71 is provided in the pin hole of each bracket 72, 72. Is inserted. The lock pin 71 is inserted in a state of protruding slightly outward from the brackets 72 and 72 (signs 71a and 71a). As shown in FIGS. 2 and 4, the holding arms 62 and 62 are placed on the protruding portions 71 a and 71 a of the lock pin 71, so that the roller 6 (the holding arms 62 and 62) is under the roller 6. I try to prevent the movement. 2 and 4 (in the state where each holding arm 62 is placed on the lock pin protruding portion 71a), the lower surface of the roller 6 is higher than the lower surface of the ground plate 5 (the roller 6 is in the upward movement position). Becomes).

  In the state of FIG. When the lock pin 71 is removed from the brackets 72, 72, the roller 6 can be rotated downward. On the other hand, as shown in FIG. 3, the holding arms 62, 62 are pivoted downward in the horizontal direction at the intermediate portions in the longitudinal direction of the holding arms 62, 62. Pin holes 64, 64 (FIG. 2) are formed to match the holes. When the lock pin 71 is inserted through the pin hole 64 of the holding arm 62 and the pin hole of the bracket 72, the holding arm 62 can be fixed in a horizontal posture by the lock pin 71 as shown in FIG. . When the holding arm 62 is in the horizontal posture state (FIG. 3), the lower surface of the roller 6 is positioned lower than the lower surface of the ground plate 5 (the roller 6 is in the downward movement position).

  The work machine A to be mounted on the vehicle 1 has a boom 12 attached to the swivel base 11 and the swivel base 11 that are disposed so as to be capable of swiveling at the rear position of the loading platform of the vehicle 1. The base end of the boom 12 is pivotally supported at the upper end of the swivel base 11. The boom 12 is composed of a telescopic boom composed of a base boom 12a, an intermediate boom 12b that is sequentially fitted into the base boom 12a, and a tip boom 12c. A hoisting hydraulic cylinder 13 for hoisting the boom 12 is disposed between appropriate positions of the base boom 12 a and the swivel base 11. An appropriate expansion / contraction drive device (not shown) such as a hydraulic cylinder for extending and retracting each boom is disposed between the booms of the boom 12.

  A post 15 is disposed at the front end of the front boom 12c via a maintenance device that maintains a vertical posture regardless of the up-and-down movement of the boom 12, and the work table 14 is disposed on the post 15 so as to be capable of being driven to turn. .

The work vehicle according to the present invention configured as described above operates as follows. That is, a case where the work vehicle is supported on the ground by the roller 6 and driven and driven by the rear wheels for the construction of the overhead wire will be described below. First, as shown in FIG. 3, the pin holes of the brackets 72 and 72 and the pins of the holding arms 62 and 62 in the state where the holding arms 62 and 62 of the front outrigger 4 a are rotated downward to the horizontal direction. The holes 64 are aligned with each other, and the lock pin 71 is inserted into each pin hole. Then, as shown in FIG. 3, the holding arm 62 can be fixed in a horizontal posture by the lock pin 71. In this state, the lower surface of the roller 6 is positioned lower than the lower surface of the ground plate 5 (the roller 6 is in the downward movement position). ). (State shown by solid line in FIG. 3)
In this state, the hydraulic cylinder 33 of the jack 30 of the front outrigger 4a is extended, the inner cylinder 32 is extended from the outer cylinder 31, and the roller 6 is grounded to the ground. At this time, the hydraulic cylinder 33 is extended so that the roller 6 is grounded within a range where the front wheel 2 does not float. (State shown by a two-dot chain line in FIG. 3)
Then, the operator who has boarded the work table 14 works by expanding and contracting the boom 12 and raising / lowering the swivel table 11 as appropriate, and turning the work table 14 at the front overhead line position as the work target position. Then, the work vehicle is moved forward by the worker who has boarded the driver's seat 1a, the work table 14 is moved along the overhead line, and the worker on the work table 14 performs the work along the overhead line.

  As described above, the roller 6 can be arranged only on the two outriggers 4a arranged on the front instead of the ground plate 5 provided on the lower end, and when working while the work vehicle is running, the two outriggers 4a on the front are arranged. Since the roller 6 is disposed at the lower end and only the two outriggers 4a are extended so that the wheels are not lifted, the working vehicle is supported on the ground by the roller 6 so that the vehicle 1 is driven. Even if the ground is uneven, the load on the rear part of the work vehicle is supported only by the rear wheel 3 (a jack with a roller is not arranged at the rear part). Therefore, even if the rear wheel 3 is positioned in the recess, the rear wheel 3 does not float in the air in the recess and idles, so that the work vehicle cannot be driven to travel. In addition, since the roller 6 can be arranged in place of the ground plate 5 provided at the lower end only in the two outriggers 4a arranged in the front, it is compared with the case where the jack with the roller is arranged separately from the front outrigger 4a. Thus, the weight of the work vehicle can be reduced and it can be manufactured at a low cost.

  In addition, the swivel base 11 is disposed at the rear position of the vehicle bed so as to be capable of being swiveled, and the distance between the swivel center of the swivel base 11 and the front outrigger 4a is separated (the swivel center of the swivel base 11 is disposed forward). Compared to the case, the distance can be separated). Therefore, when working while the work vehicle is supported on the ground by the roller 6 and driven by the rear wheels, the boom 12 is generally operated with the front facing the front, so that the work range can be widened. That is, the turning angle to the side of the boom 12 facing forward and the fall angle of the extended boom 12 can be increased.

Next, when the work vehicle is operated at the stop position, the work vehicle is supported on the ground by the four outriggers 4 arranged at the front, rear, left and right, and the front outrigger is operated as follows. What is necessary is just to make 5 earth | ground to the ground. That is, as shown in FIGS. 2 and 4, the holding arms 62 and 62 are placed on the protruding portions 71a and 71a of the lock pin 71, and the roller 6 (both holding arms 62 and 62) is moved downward. The lower surface of the roller 6 is positioned higher than the lower surface of the ground plate 5 so that the roller 6 is blocked (the roller 6 is in the upward movement position). (State shown as a solid line in FIG. 4)
In this state, the hydraulic cylinders 33 arranged on the jacks 30 of the four outriggers 4 in the front, rear, left, and right are extended, the inner cylinder 32 is extended from the outer cylinder 31, the vehicle 1 is levitated, and the vehicle 1 is supported by the ground plate 5 . (The state shown by the two-dot chain line in FIG. 4) Then, the operator who has boarded the work table 14 expands / contracts the boom 12 as appropriate, turns the swivel table 11, and moves the work table 14 to the work target position. Do work.
Second Embodiment Next, in the above embodiment, the roller 6 is held by the pair of holding arms 62, 62, but may be held in a cantilever manner. Hereinafter, an embodiment in this case will be described as a second embodiment with reference to FIGS.

  As shown in FIGS. 5 to 7, the roller 6 is cantilevered by one holding arm 62 on the inner surface side of the lower end portion of the inner cylinder 32. The holding arm 62 has a substantially triangular shape, and its one corner is pivotally supported by the pivot 63 on the inner side surface of the lower end portion of the inner cylinder 32. The roller shaft 61 of the roller 6 is attached in the vicinity of one corner portion of the holding arm 62 that is separated from the pivot 63. Then, the holding arm 62 is centered on the pivot 63, and the lower surface of the roller 6 shown in FIG. 5 is lower than the lower surface of the ground plate 5, and the lower surface of the roller 6 shown in FIG. An arc can be turned up and down between the upper moving position which is higher than the lower surface.

  A pin hole 64 through which the lock pin 71 is inserted is formed in the vicinity of the remaining corner of the holding arm 62. On the other hand, at the lower end portion of the inner cylinder 32, a pin hole 73 that overlaps with the pin hole 64 of the holding arm 62 at the roller downward movement position, and a pin hole 74 that overlaps with the pin hole of the holding arm 62 at the movement position on the ground plate Are formed respectively. The pin holes 73 and 74 on the inner cylinder 32 side respectively penetrate the inner cylinder 32 in the inner and outer directions, and the insertion / extraction operation of the lock pin 71 is performed from the outer surface side of the inner cylinder 32.

The embodiment of the present invention configured as described above operates as follows. A case where the work vehicle is supported on the ground by the roller 6 and is driven and driven by the rear wheels to perform the overhead line work will be described below. First, as shown in FIG. 5, the pin holes 64 of the holding arm 62 are overlapped in the pin holes 73 on the inner cylinder 32 side, and the lock pins 71 are inserted into the pin holes, so that the lower surface of the roller 6 shown in FIG. Is in a state of a downward movement position where the height is lower than the lower surface of the ground plate 5. (The state shown by solid lines in FIGS. 5 and 6)
In this state, the hydraulic cylinder 33 of the jack 30 of the rear outrigger 4b is extended, the inner cylinder 32 is extended from the outer cylinder 32, and the roller 6 is grounded. At this time, the hydraulic cylinder 33 is extended so that the roller 6 is grounded within a range where the front wheel 2 does not float. (The state shown by the two-dot chain line in FIGS. 5 and 6)
Then, the worker who has boarded the work table 14 works by expanding and contracting the boom 12 and raising / lowering the swivel table 11 as appropriate, and turning the work table 14 at the rear overhead line position as the work target position. Then, the work vehicle is moved forward by the worker who has boarded the driver's seat 1a, the work table 14 is moved along the overhead line, and the worker on the work table 14 performs the work along the overhead line.

  In this way, the roller 6 can be arranged only in the two outriggers 4a arranged at the rear instead of the ground plate 5 provided at the lower end, and when working while the work vehicle is traveling, the two outriggers 4a in the front are arranged. Since the roller 6 is disposed at the lower end and only the two outriggers 4a are extended so that the wheels are not lifted, the working vehicle is supported on the ground by the roller 6 so that the vehicle 1 is driven. Even if the ground is uneven, the load on the rear part of the work vehicle is supported only by the rear wheel 3 (a jack with a roller is not arranged at the rear part). Therefore, even if the rear wheel 3 is positioned in the recess, the rear wheel 3 does not float in the air in the recess and idles, so that the work vehicle cannot be driven to travel. In addition, since the roller 6 can be arranged in place of the ground plate 5 provided at the lower end only in the two outriggers 4a arranged in the front, it is compared with the case where the jack with the roller is arranged separately from the front outrigger 4a. Thus, the weight of the work vehicle can be reduced and it can be manufactured at a low cost.

  In addition, the swivel base 11 is disposed at the rear position of the vehicle bed so as to be capable of being swiveled, and the distance between the swivel center of the swivel base 11 and the front outrigger 4a is separated (the swivel center of the swivel base 11 is disposed forward). Compared to the case, the distance can be separated). Therefore, when working while the work vehicle is supported on the ground by the roller 6 and driven by the rear wheels, the boom 12 is generally operated with the front facing the front, so that the work range can be widened. That is, the turning angle to the side of the boom 12 facing forward and the fall angle of the extended boom 12 can be increased.

Next, when the work vehicle is operated at the stop position, the work vehicle is supported on the ground by the four outriggers 4 arranged at the front, rear, left and right, and the front outrigger 4a is contacted as follows. The ground plane 5 may be grounded to the ground. That is, as shown in FIG. 7, the pin hole 64 of the holding arm 62 and the pin hole 74 of the inner cylinder 32 are overlapped so that the lower surface of the roller 6 is in the upward movement state where the lower surface of the ground plate 5 is higher. The lock pin 71 is inserted into each pin hole. Then, the lower surface of the roller 6 is positioned higher than the lower surface of the ground plate 5 (the roller 6 is in the upward movement position). (The state shown by the solid line in FIG. 7)
In this state, the hydraulic cylinders 33 arranged on the jacks 30 of the four outriggers 4 in the front, rear, left, and right are extended, the inner cylinder 32 is extended from the outer cylinder 31, the vehicle 1 is levitated, and the vehicle 1 is supported by the ground plate 5 . (The state shown by the chain line in FIG. 7) Then, the operator who has boarded the work table 14 expands / contracts the boom 12 appropriately, turns the swivel table 11 and turns the work table 14 to the work target position to perform work at a high place. Do.

  In the above embodiment, when the roller 6 is disposed instead of the ground plate 5 provided at the lower end only in the two outriggers 4a disposed in the front, the roller 6 is swung to the inner cylinder 32 by the holding arm 62. Thus, the lower surface of the roller 6 is positioned at a lower position where the lower surface is lower than the lower surface of the ground plate 5, and the upper position is where the lower surface of the roller 6 is higher than the lower surface of the ground plate 5. The roller 6 is disposed at the lower end of the cylinder 32, the ground plate 5 is swung at the lower end portion of the inner cylinder 32, and the lower position of the ground plate 5 is lower than the lower surface of the roller 6. The lower surface of the roller 6 may be positioned higher than the lower surface.

  Further, although the holding arm 62 has been described above as swinging manually, it may be configured to swing automatically by interposing a hydraulic cylinder or the like.

Next, in the first and second embodiments, the roller 6 is replaced with the ground plate 5 provided at the lower end only in the two outriggers 4a arranged in the front out of the front outrigger 4a and the rear outrigger 4b. Although the arrangement is possible, a dedicated roller jack for arranging the roller 6 as described below may be arranged separately from the front outrigger 4a and the rear outrigger 4b.
Third Embodiment This case will be described below as a third embodiment with reference to FIGS. As shown in FIGS. 8 to 10, the work vehicle includes a pair of left and right front wheels 2 that can be steered by the vehicle 1 and a pair of left and right rear wheels 3 that are rotationally driven by an engine mounted on the vehicle 1. A pair of left and right outriggers 4a and 4b are arranged in front and rear of the vehicle 1, respectively. Each of the outriggers 4a and 4b includes the jack 30 and is attached to the frame of the vehicle 1 within the vehicle width via a fixed arm (not shown). Further, the arm may be configured to be able to advance and retreat in the vehicle width direction, and the jack 30 may be protruded from the vehicle width to be extended or stored within the vehicle width.

  Between the outrigger 4a and the front wheel 2 disposed in the front, two roller jacks 8 having a roller 7 at the lower end and extending in a range in which the front wheel 2 does not float are disposed. The roller jack 8 includes an outer box 9, an inner box 10 fitted in the outer box 9, and a hydraulic cylinder (not shown) disposed between the two boxes and extending the inner box 10 with respect to the outer box 9. is doing. A roller 7 is rotatably disposed at the lower end of the inner box 10. The rotation axis of the roller 7 is parallel to the rotation axis of the front wheel 2, the roller 7 is projected outward from the inner box 10, and the outer side of the roller 7 is disposed at a substantially vehicle width position. When the outer box 9 is attached to the frame of the vehicle 1, it is attached via an attachment member 4c fixed to the arm 4a. The roller jack 8 configured as described above extends the inner box 10 from the outer box 9 by extending the hydraulic cylinder, extends the roller 7 to the ground without extending the front wheel 2 to ground the vehicle 1, It can be supported.

  The work machine A has a boom 12 attached to a swivel base 11 and a swivel base 11 that are disposed so as to be capable of swiveling at a rear position of the loading platform of the vehicle 1. The swivel base 11 is bent upward at the rear, and the base end of the boom 12 is pivotally supported at the upper end. The boom 12 is composed of a telescopic boom composed of a base boom 12a, an intermediate boom 12b that is sequentially fitted into the base boom 12a, and a tip boom 12c. A hoisting hydraulic cylinder 13 for hoisting the boom 12 is disposed between appropriate positions of the base boom 12 a and the swivel base 11. An appropriate expansion / contraction drive device (not shown) such as a hydraulic cylinder for extending and retracting each boom is disposed between the booms of the boom 12.

  A post (not shown) is disposed at the tip of the front boom 12c via a maintenance device that maintains a vertical posture regardless of the up-and-down movement of the boom 12, and the work table 14 is disposed on the post so as to be able to be driven to rotate. ing.

  The work vehicle according to the third embodiment of the present invention configured as described above operates as follows. That is, a case where the work vehicle is supported on the ground by the roller jack 8 and is driven while driving the rear wheels to perform the overhead wire work will be described below. The hydraulic cylinder of the roller jack 8 is extended, the inner box 10 is extended from the outer box 9, and the roller 7 is grounded to the ground. At this time, the roller jack 8 is extended within a range where the front wheel 2 does not float.

  Then, the worker who has boarded the work table 14 works by expanding and contracting the boom 12 and raising / lowering the swivel table 11 as appropriate, and turning the work table 14 at the rear overhead line position as the work target position. Then, the work vehicle is moved forward by the worker who has boarded the driver's seat 1a, the work table 14 is moved along the overhead line, and the worker on the work table 14 performs the work along the overhead line.

  As described above, the two roller jacks 8 arranged in the front are extended within a range in which the front wheels 2 do not float, and the work vehicle is supported on the ground by the roller jacks 8 so that the work can be performed while driving the rear wheels. Therefore, even if the ground when traveling is uneven, the load on the rear portion of the work vehicle is supported only by the rear wheel 3 (a jack with a roller is not disposed at the rear portion). Therefore, even if the rear wheel 3 is positioned in the recess, the rear wheel 3 does not float in the air in the recess and idles, so that the work vehicle cannot be driven to travel. Moreover, since the rear wheel 3 is always in contact with the ground, the load on the rear wheel 3 does not fluctuate, and stable braking performance can be obtained at all times. Since the two roller jacks 8 are arranged only in the front, the weight of the work vehicle can be reduced as compared with the case where four roller jacks are arranged in front and rear, respectively. Can be manufactured at low cost.

  In addition, a swivel base 11 is disposed at a rear position of the loading platform of the vehicle 1 so as to be capable of being swiveled, and the distance between the swivel center of the swivel base 11 and the front jack 8 is separated (the swivel center of the swivel base 11 is positioned forward). Can be separated from the distance compared to the case of the arrangement). Therefore, when working while the work vehicle is supported on the ground by the roller 7 and driven by the rear wheels, the boom 12 is generally operated with the front facing the front, so that the work range can be widened. That is, the turning angle to the side of the boom 12 facing forward and the fall angle of the extended boom 12 can be increased.

  In the case of the third embodiment, even if the front wheel 2 is located in the concave portion of the ground, the roller jack 8 is disposed between the front wheel 2 and the front outrigger 4a. The vehicle 7 is positioned in the concave portion of the front wheel 2 together with the roller 7, and the vehicle 1 is supported by the roller 7, and the rear wheel 3 can be prevented from flying idly in the concave portion of the ground as much as possible. That is, since the front wheel 2 is generally a wheel that steers the vehicle 1, it is possible to prevent as much as possible the situation in which the work vehicle cannot be steered in such a case. Further, even if the front wheel 2 is located on the convex portion of the road surface, the roller 7 is also close to the convex portion, so that the load on the front portion is not supported only by the front wheel 2 at the convex portion, and the work vehicle Can be prevented.

When the work vehicle is operated at the stop position, the work vehicle is supported on the ground by the outrigger 4 and the work is the same as before, so detailed description will be omitted.
Fourth Embodiment Next, in the above embodiment, the roller jack 8 is disposed vertically between the front wheel 2 and the front outrigger 4a. However, as shown in FIGS. You may make it arrange | position diagonally so that it may adjoin. Hereinafter, an embodiment in this case will be described as a fourth embodiment with reference to FIGS.

  A roller jack 20 shown in FIGS. 11 and 12 is configured such that a roller 21 is directly expanded and contracted by a hydraulic cylinder, and includes a hydraulic cylinder 22, a roller 21, and a rod stopper 23. That is, when the hydraulic cylinder 22 is mounted between the front wheel 2 and the front outrigger 4a, the mounting member 4d having the cylinder side fastened to the outer cylinder 31 of the jack 30 so that the roller 21 comes close to the front wheel 2 as it extends. It is attached diagonally. When the rod rotates with the expansion and contraction of the hydraulic cylinder 22, the rotation axis of the roller 21 does not become parallel to the rotation axis of the front wheel 2, so that the rotation axis of the roller 21 and the rotation axis of the front wheel 2 are maintained in parallel. A detent 23 is disposed. This detent 23 is composed of a telescopic blade that connects the rod of the hydraulic cylinder 22 and the point of deviation from the mounting position of the roller 21 to the cylinder side of the hydraulic cylinder 22 and expands and contracts in conjunction with the expansion and contraction of the hydraulic cylinder 22. Yes.

  The effect similar to the above can be obtained by the roller jack 20 configured as described above. That is, when the work vehicle is supported on the ground by the roller jack 20 and is operated while being driven by the rear wheels, the roller jack 8 is extended within a range in which the hydraulic cylinder 22 is extended and the front wheel 2 is not lifted. Since the roller jack 20 is disposed obliquely so that the roller 21 comes close to the front wheel 2 as it extends, the roller 21 can be grounded close to the front wheel 2. Then, the worker who has boarded the work table 14 works by expanding and contracting the boom 12 and raising / lowering the swivel table 11 as appropriate, and turning the work table 14 at the rear overhead line position as the work target position. Then, the work vehicle is moved forward by the worker who has boarded the driver's seat 1a, the work table 14 is moved along the overhead line, and the worker on the work table 14 performs the work along the overhead line.

  Therefore, even if the ground at the time of running is uneven, the rear load of the work vehicle is supported only by the rear wheel 3 (a jack with a roller is not disposed at the rear). Therefore, even if the rear wheel 3 is positioned in the recess, the rear wheel 3 does not float in the air in the recess and idles, so that the work vehicle cannot be driven to travel. Moreover, since the rear wheel 3 is always in contact with the ground, the load on the rear wheel 3 does not fluctuate, and stable braking performance can be obtained at all times. And since the two roller jacks 20 are arranged only in the front, the weight of the work vehicle can be reduced as compared with the case where a total of four roller jacks are arranged in the front and rear, respectively. Can be manufactured at low cost.

  In addition, the swivel base 11 is disposed at the rear position of the loading platform of the vehicle 1 so as to be able to be swiveled, and the distance between the swivel center of the swivel base 11 and the front roller jack 20 is separated. (The distance can be increased as compared with the case where the turning center of the turntable 11 is disposed forward.) Therefore, when the work vehicle is supported while being driven on the ground by the roller 21 and is driven to drive the rear wheels, Since the boom 12 is operated toward the front, the work range can be widened. That is, the turning angle to the side of the boom 12 facing forward and the fall angle of the extended boom 12 can be increased.

  In the case of the fourth embodiment, even if the front wheel 2 is located in the concave portion of the ground, the roller jack 20 is disposed obliquely between the front wheel 2 and the front outrigger 4a. It can be disposed close to the roller, and is positioned in the recess of the front wheel 2 together with the roller 21, and the vehicle 21 is supported by the roller 21, and the front wheel 2 can be prevented from flying in the air in the recess of the ground as much as possible. . That is, since the front wheel 2 is generally a wheel that steers the vehicle 1, it is possible to prevent as much as possible the situation in which the work vehicle cannot be steered in such a case. Moreover, even if the front wheel 2 is located on the convex portion of the road surface, the roller 7 is also close to the convex portion, so that the load on the front wheel side is not supported only by the front wheel 2 at the convex portion. Can be prevented.

When the work vehicle is operated at the stop position, the case where the work vehicle is supported on the ground by the front outrigger 4a and the rear outrigger 4b is the same as before and detailed description thereof is omitted.
Fifth Embodiment Next, a fifth embodiment illustrated in FIGS. 13 and 14 will be described below. In this embodiment, a triangular link is used so that the roller comes close to the front wheel 2 as it extends, and the roller jack 50 of this embodiment includes a hydraulic cylinder 51, a triangular link 52, and a mounting member 53. , And a roller 54. That is, the attachment member 53 is fixed along the outer cylinder 31 of the jack 30, pivotally supports the base end portion of the hydraulic cylinder 51 on the upper side, and is one point at three fulcrums of the triangular link 52 on the lower side. Is pivotally supported. The other one of the three fulcrums of the triangular link 52 is pivotally supported with the rod tip of the hydraulic cylinder 51, and the remaining fulcrum is pivotally supported by the rotation axis of the roller 54.

The roller jack 50 configured as described above can extend the hydraulic cylinder 51 so that the triangular link 52 acts to ground the roller 54 close to the front wheel 2. (From the retracted state shown in FIG. 13 to the extended state shown in FIG. 14) Therefore, it can be easily understood that the same effect as in the fourth embodiment can be obtained by the roller jack 50. The description about the effect | action and effect in 5 embodiment is abbreviate | omitted.
Sixth Embodiment Further, a sixth embodiment illustrated in FIGS. 15 and 16 will be described below. In this embodiment, when the roller is brought close to the front wheel 2 along with the extension, the hydraulic cylinder is reversely attached and the link is arranged. The roller jack 40 of this embodiment includes a hydraulic cylinder 41, an attachment member 42, and a link 43. , And a roller 44. That is, the attachment member 42 is fixed along the outer cylinder 31 of the jack 30, pivotally supporting the rod tip of the hydraulic cylinder 41 at the upper portion, and pivotally supporting one of the links 43 at the lower portion. The other side of the link 43 pivotally supports the central portion of the hydraulic cylinder 41 on the cylinder side via a trunnion. A roller 44 is attached to the end of the hydraulic cylinder 41 on the cylinder side.

  The roller jack 40 configured as described above can extend the hydraulic cylinder 41 so that the link 43 acts to ground the roller 44 close to the front wheel 2. (From the retracted state shown in FIG. 15 to the extended state shown in FIG. 16) Therefore, it can be easily understood that the effect similar to that of the fourth embodiment can be obtained by the roller jack 40. The description about the effect in the form is omitted.

  In the description of the above embodiment, the working vehicle A is the working vehicle in which the swivel base 11 is disposed on the vehicle 1 so as to be turnable, the boom 12 is disposed so as to be able to expand and contract, and the work table 14 is disposed at the tip of the boom 12. As an example, an aerial work vehicle has been described as an example, but it is needless to say that the present invention can also be applied to a bridge inspection vehicle, a crane, or the like having the same configuration.

It is explanatory drawing explaining the work vehicle of 1st Embodiment which concerns on this invention. It is explanatory drawing explaining the state supported with the grounding plate with the work vehicle of 1st Embodiment which concerns on this invention with a perspective view. It is explanatory drawing explaining the state made to support with a roller with the work vehicle of 1st Embodiment which concerns on this invention. It is explanatory drawing explaining the state made to support with the ground plate in the work vehicle of 1st Embodiment which concerns on this invention. It is explanatory drawing explaining the state made to support with a roller in the work vehicle of 2nd Embodiment which concerns on this invention. FIG. 6 is a right side view of FIG. 5. It is explanatory drawing explaining the work vehicle of 2nd Embodiment which concerns on this invention, and is explanatory drawing explaining the state made to support with a ground plate. It is explanatory drawing explaining the work vehicle of 3rd Embodiment which concerns on this invention. It is explanatory drawing explaining the retracted state of a roller jack in the work vehicle of 3rd Embodiment which concerns on this invention. It is explanatory drawing explaining the overhang | projection state of a roller jack with the work vehicle of 3rd Embodiment which concerns on this invention. In the work vehicle of 4th Embodiment which concerns on this invention, it is explanatory drawing explaining the retracted state of a roller jack. It is explanatory drawing explaining the overhang | projection state of a roller jack with the work vehicle of 4th Embodiment which concerns on this invention. In the work vehicle of 5th Embodiment which concerns on this invention, it is explanatory drawing explaining the storing state of a roller jack. It is explanatory drawing explaining the overhang | projection state of a roller jack with the work vehicle of 5th Embodiment which concerns on this invention. In the work vehicle of 6th Embodiment which concerns on this invention, it is explanatory drawing explaining the retracted state of a roller jack. It is explanatory drawing explaining the overhang | projection state of a roller jack with the work vehicle of 6th Embodiment which concerns on this invention.

Explanation of symbols

1 Vehicle 2 Front Wheel 3 Rear Wheel 4 Outrigger 5 Grounding Plate 6 Roller 7 Roller 8 Roller Jack 11 Swivel Table 12 Boom 20 Roller Jack 21 Roller 40 Roller Jack 41 Roller 50 Roller Jack 51 Roller A Working Machine

Claims (4)

Four outriggers are mounted on the vehicle and equipped with grounding plates at the lower ends at the front, rear, left and right positions of the vehicle to support the work vehicle on the ground, and only the two outriggers arranged in front are provided at the lower ends. The roller can be arranged in place of the grounding plate, and when the work vehicle is operated at the stop position, the grounding plates of the four front and rear outriggers are grounded to the ground to support the work vehicle, When working, a roller is arranged at the lower end of the two front outriggers, and only the two outriggers are extended so that the wheels are not lifted. The work vehicle is supported on the ground by the rollers and the vehicle is driven to run. Feature work vehicle. There are four outriggers mounted on the vehicle and equipped with grounding plates at the lower ends at the front, rear, left, and right positions of the vehicle to support the work vehicle on the ground, and only between the outriggers and the front wheels arranged in front of the lower ends. Two roller jacks with rollers are arranged, and when working the work vehicle at the stop position, the grounding plates of the four front and rear outriggers are grounded to the ground to support the work vehicle, and while the work vehicle is running A working vehicle characterized in that when the work is carried out, the two roller jacks are extended in a range in which the wheels are not lifted so that the work vehicle is supported on the ground by a roller and the vehicle is driven. The work vehicle according to claim 2, wherein the roller jack is disposed obliquely so that the roller comes close to the front wheel as it extends. 4. The work vehicle according to claim 1, wherein the work machine includes a turntable that can turn at a rear position of the loading platform of the vehicle, and a boom attached to the turntable. 5.

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