JP2002193587A - On-vehicle crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light crane base 3 at a low price improved in the hoisting capacity in a front working area in an on-vehicle crane A provided with an outrigger device 25 mounted on a right and a left vehicle frames 1a positioned just in rear of a cab 2 of a vehicle 1 freely to be projected toward both sides of the vehicle. SOLUTION: An outer cylinder 26 of the outrigger device 25 is formed into a V-shape with a plane view that a central part thereof in the longitudinal direction is bent backward of the vehicle. A pair of fixing brackets 29 in right and left for fastening the outer cylinder 26 to the right and the left vehicle frames 1a for fixation is fitted to a position in front of the cylinder 16 and opposite to the right and the left vehicle frames 1a. A nearly central part of a support frame 16 placed on the right and the left vehicle frames 1a at both ends 16a thereof is fixed to a rear position of the crane base 3. A pair of fixing brackets 17 to be fastened to the right and the left vehicle frames 1a for fixation are fitted to the both ends 16a of the support frame 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-vehicle crane mounted on a vehicle and used for loading cargo.

[0002]

2. Description of the Related Art An on-board crane A as shown in FIGS. 5 and 6, for example, is used as a crane mounted on a vehicle and used for loading cargo. The on-board crane A is
Left and right vehicle frames located just behind driver's cab 2 of vehicle 1
1a, a crane base 3 mounted on 1a, a swivel post 4 erected on the crane base 3 so as to be rotatable, and a winch device which is pivotally supported on the upper part of the swivel post 4 so as to be able to move up and down. Wire rope 7 driven up and down by 6
And a telescopic boom 5 which suspends a hook block 8 for hanging a load. Reference numeral 9 denotes an up-and-down cylinder for driving the telescopic boom 5 up and down.

An outrigger device 10 is attached to the on-vehicle crane A so as to protrude to the side of the vehicle during loading operation and stably support the vehicle 1. Outrigger device concerned
10, the vehicle 1 has openings 11b at both ends as shown in FIG.
The outer cylinder 11 has a longitudinally central portion 11a fixed to the front end of the crane base 3 so as to be located in the vicinity of the vehicle side of the outer cylinder 11 and the opening 11b, 11b at both ends of the outer cylinder 11. Left and right inner cylinders 12, 12 fitted so as to be able to protrude toward the side, and left and right jack devices 13, 13 which are vertically fixed to the tips of the left and right inner cylinders 12, 12 to jack up the front part of the vehicle. It is composed of

[0004] A vehicle-mounted crane A constructed as described above.
Prior to loading work, the vehicle 1 is stably supported using the outrigger device 10 in the following procedure. That is, first, the left and right inner cylinders of the outrigger device 10
The left and right jacks 13, 13 are extended from the openings 11b, 11b of both ends of the outer cylinder 11 to the side of the vehicle, and then the left and right jack devices 13, 13 are extended to jack up the front of the vehicle so that the vehicle 1 can be stably supported. Has become. Then, with the vehicle 1 stably supported,
The luggage is hung on the hook block 8, the swivel post 4 is swiveled, the telescopic boom 5 is raised and lowered, and the telescopic boom 5 is driven to move the telescopic boom tip 5a to an arbitrary position. By moving the block 8 up and down, the loading operation of the load is performed.

On the other hand, the on-vehicle type crane A is mounted on the vehicle 1 at a position on the front side of the outer cylinder 11 of the outrigger device 10 at a position facing the left and right vehicle frames 1a, 1a. , 15 and the pair of left and right fixing brackets 15, 15 are fastened and fixed to the left and right vehicle frames 1a, 1a using fastening members (not shown) such as U bolts, so that the front part of the crane is attached. I have. At the rear position of the crane base 3, both ends 16a, 16a are fixed substantially at the center of a support frame 16 on which the left and right vehicle frames 1a, 1a are mounted, and both ends 16a of the support frame 16 are fixed. , 16a provided on the left and right vehicle frames 1a, 1a using fastening members (not shown) such as U-bolts.
To the rear of the crane.

The front and rear fixing brackets
15 and 17 effectively reduce the bending force acting on the crane base 3 via the telescopic boom 5 during loading work.
In order to transmit to 1a, they are placed as far back and forth as possible as far as the crane body space allows. In order to prevent the support frame 16 from being deformed toward the outer cylinder 11 side by the bending force acting during the loading operation and not providing a sufficient support force, the support frame 16 is provided with the both end portions 16a, 16a. Connecting member 16
The outer cylinder 11 is fixed to the right and left appropriate positions using b and 16b.

FIG. 7 shows another embodiment of the outrigger device used in the on-vehicle type crane A. The outrigger device 20 is an outrigger with an outer cylinder having left and right outer cylinders arranged in front and rear. Device. Outrigger device concerned
Reference numeral 20 denotes a front end of the crane base 3 which is provided in front and rear so that one end openings 211b and 212b of the left and right outer cylinders 211 and 212 are located near each other on the opposite side of the vehicle. It is fixed and configured. Then, the left and right outer cylinders 21
Left and right inner cylinders 22, 22 having left and right jack devices 23, 23 suspended therefrom at their distal ends are respectively slidably fitted into the cylindrical portions 211c, 212c of the first and second 212, respectively. The outrigger device 20 thus configured also extends the left and right inner cylinders 22 and 22 to the side of the vehicle similarly to the outrigger device 10 and the left and right jack devices 2.
By extending 3, 23, the front of the vehicle can be jacked up and the vehicle 1 can be stably supported.
The outer cylinder 211 of the outrigger device 20 and the support frame 16 are attached to the left and right vehicle frames 1a, 1a in the same manner as described above.
Are mounted using fixing brackets 15 and 17, respectively.

[0008]

A vehicle-mounted crane A of this type generally has a total center of gravity G of the vehicle 1 including a suspended load W.
Are left and right lateral fall-off support lines Sa, Sb connecting the grounding points a, a of the left and right jack devices 13, 13 (or 23, 23) and the center b of the rear wheels 18, 18; (And 23, 23)
Can safely work when it is located in the area surrounded by the front falling branch lines Sc connecting the grounding points a, a with each other, while the total center of gravity G is determined by the falling center lines Sa, Sb, Sc
It falls when it goes out of the area surrounded by. For this reason, the conventional on-vehicle crane A has left and right inner cylinders.
Set the overhang width of 12, 12 (22, 22) as large as possible,
The left and right lateral fall-off support lines Sa and Sb are located closer to the vehicle side to improve the lifting capacity mainly in the lateral working area (the working area on both sides of and behind the vehicle 1).

However, a heavy engine 19 is mounted at the front of the vehicle 1, and the overall center of gravity G of the vehicle 1 is shifted toward the front of the vehicle 1. For this reason, in the conventional vehicle-mounted crane A, the distance between the total center of gravity G and the front fall-off branch line Sc is short, and the lifting capacity in the front working area is significantly reduced as compared with the side working area. . For this reason, there has been a problem in that when the vehicle is turned from the side work area to the front work area during the loading operation, the lifting capacity is rapidly reduced, and the workability is poor.

In the conventional on-board crane A, the crane base 3 is formed of a hollow cylinder in order to reduce the weight. Moreover, the outer cylinder 11 (and 211, 212) of the outrigger device 10 (and 20)
Are mounted at the front end of the crane base 3 and the support frame 16 is mounted at the rear position of the crane base 3 so as to be separated from each other. Therefore, when a bending force is applied from the telescopic boom 5 during loading operation, the outer cylinder 11 ( And 211, 212) and the crane base 3 located between the support frame 16 and excessive stress are generated, and it is necessary to configure the crane base 3 with high strength. For this reason, there has been a problem that large-scale reinforcement is required, the weight of the crane base 3 is increased, and the manufacturing cost is increased.

The present invention has been made in view of the above-mentioned conventional problems,
By configuring the left and right jack devices of the outrigger device to extend diagonally forward of the vehicle, the forward fall branch line is set at a position closer to the front of the vehicle as compared with the conventional one, thereby increasing the lifting capacity in the front working area. In addition to this, the fixed position of the outer cylinder with respect to the crane base is set closer to the rear of the base as compared with the conventional one, so that excessive stress does not occur at the rear of the base. The purpose is to provide an inexpensive crane base.

[0012]

The present invention has the following structure as means for solving the above-mentioned problems. In other words, the on-vehicle crane according to claim 1 of the present invention is mounted on left and right vehicle frames located immediately behind the cab of the vehicle, and its longitudinal center is positioned so that the openings at both ends are located near the vehicle side of the vehicle. The outer cylinder fixed to the crane base on which the telescopic boom is pivotably mounted, and the left and right sides of the outer cylinder that can be extended from both ends of the outer cylinder toward the vehicle side and the jack device is vertically attached to the tip It is intended for a vehicle-mounted crane provided with an outrigger device composed of an inner cylinder.

[0013] In the vehicle-mounted crane according to the first aspect of the present invention, the outer cylinder of the outrigger device may be formed such that a central portion in a longitudinal direction thereof is bent toward the rear of the vehicle, or a substantially entire region in the longitudinal direction. A left and right pair of left and right parts that are fixed to the left and right vehicle frames at a position facing the left and right vehicle frames at a front side position of the outer cylinder while being formed in an arc shape in a plan view curved toward the rear of the vehicle. A fixed bracket is attached, and further, at the rear position of the crane base, both ends are fixed substantially at the center of a support frame placed on the left and right vehicle frames, and the left and right vehicle frames are attached to both ends of the support frame. And a pair of left and right fixing brackets to be fastened and fixed.

In the vehicle-mounted crane according to the first aspect of the present invention, the outer cylinder of the outrigger device is formed in a rectangular shape in a plan view in which a longitudinal central portion is bent toward the rear of the vehicle, or substantially the entire region in the longitudinal direction. Since the left and right jack devices are configured to be curved toward the rear of the vehicle in a plan view arc shape, the left and right jack devices are installed in a position that is larger than the conventional one when the left and right jack devices are extended to the side of the vehicle and loaded. It can be set to the front position. For this reason, the front fall branch line is located at a position closer to the front of the vehicle, and the lifting capacity in the front working area can be increased.

Further, the outer cylinder of the outrigger device is formed in a rectangular shape in plan view with its longitudinal center portion bent toward the rear of the vehicle.
Alternatively, since substantially the entire area in the longitudinal direction is formed in an arc shape in a plan view curved toward the rear of the vehicle, when the fixing bracket attached to the outer cylinder is arranged at the same position as the conventional one, the outer cylinder is fixed to the crane base. The installation position is closer to the rear than the conventional one, and the separation distance between the outer cylinder and the support frame is shorter. For this reason, even if bending force acts on the crane base from the telescopic boom during loading work, the supporting span is short, so that excessive stress does not occur at the rear part of the base, reducing reinforcement and reducing the weight and cost of the crane base. It can be provided.

A vehicle-mounted crane according to a second aspect of the present invention is mounted on left and right vehicle frames located immediately behind a driver's cab of a vehicle, and one end opening is located near a vehicle side opposite to the vehicle. The left and right outer cylinders fixed to the crane base on which the telescopic boom is pivotally mounted so that the central part in the longitudinal direction in the attached state is attached to the front and rear, and the vehicle from the one end opening of the left and right outer cylinders respectively It is intended for an on-vehicle crane provided with an outrigger device composed of left and right inner cylinders that can be extended toward the front end and a jack device is vertically fixed to a tip portion.

According to a second aspect of the present invention, the left and right outer cylinders of the outrigger device are formed in a circular arc shape in a plan view in which substantially the entire region in the longitudinal direction is curved toward the rear of the vehicle. A pair of left and right fixing brackets for fastening and fixing the outer cylinder to the left and right vehicle frames are attached to the front positions of the outer cylinders located and facing the left and right vehicle frames, and both ends are provided at rear positions of the crane base. A part of the support frame placed on the left and right vehicle frames is fixed substantially at the center, and a pair of left and right fixing brackets for fastening and fixing to the left and right vehicle frames are attached to both ends of the support frame. I have.

In the vehicle-mounted crane according to the second aspect of the present invention, since the left and right outer cylinders of the outrigger device are formed in an arc shape in a plan view in which substantially the entire region in the longitudinal direction is curved toward the rear of the vehicle, the left and right outer cylinders are formed. When the jacking device is extended to the side of the vehicle to perform the loading operation, the installation positions of the left and right jack devices can be set to the front positions of the vehicle as compared with the conventional jack device. For this reason, the front fall branch line is located at a position closer to the front of the vehicle, and the lifting capacity in the front working area can be increased.

Further, since the left and right outer cylinders of the outrigger device are formed in an arc shape in a plan view in which substantially the entire region in the longitudinal direction is curved toward the rear of the vehicle, the fixing bracket attached to the outer cylinder is located at the same position as the conventional one. In this case, the fixed position of the outer cylinder with respect to the crane base is closer to the rear than in the conventional case, and the separation distance between the outer cylinder and the support frame is shorter. Therefore, even if a bending force is applied to the crane base during loading work, the supporting span is short, so that excessive stress does not occur at the rear of the base, reducing the reinforcement and providing a lightweight and low-cost crane base. You can do it.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific structure of the present invention will be described below with reference to FIGS. The vehicle-mounted crane according to the present invention is a conventional outrigger device in which the shape of the outer cylinder and the fixed position with respect to the crane base are changed, and the following description will focus on the differences. I do.

In FIG. 1, reference numeral 26 denotes an outer cylinder of the outrigger device 25 formed of a single long cylindrical body. The outer cylinder 26
Is formed in a rectangular shape in a plan view in which a longitudinal central portion 26a is bent toward the rear of the vehicle, and has both end openings 26a.
A central portion 26a in the longitudinal direction is mounted at a position closer to the rear of the crane base 3 so that b and 26b are located near the vehicle side of the vehicle 1. For this reason, the left and right cylindrical bodies 26 of the outer cylinder 26
c and 26c are arranged so that their longitudinal axis e1 is inclined obliquely forward with respect to the longitudinal axis o of the vehicle 1. In addition, left and right inner cylinders 27, 27 having left and right jack devices 28, 28 suspended from the distal ends thereof are slidably fitted into the left and right cylindrical bodies 26c, 26c of the outer cylinder 26, respectively. Therefore, if the left and right inner cylinders 27, 27 are pulled out to the side of the vehicle, the left and right jack devices 28, 28 are extended obliquely forward of the vehicle 1 as shown by the solid line in FIG. It can be installed at a position closer to the front of the vehicle 1 than at a position (shown by a dashed line). Thereby, the front fall branch line Sc1
Is also closer to the front of the vehicle 1 as compared with the conventional one, and the distance L1 to the total center of gravity G can be increased by the amount that the front fall-off branch line Sc1 has shifted to the front of the vehicle. The ability can be increased.

As described above, the left and right jack devices 28,
If 28 is configured to project diagonally forward of vehicle 1, inner cylinder 2
When the overhang amounts of 7, 27 are set to the same overhang amount as the conventional one, the jack overhang width in the lateral direction of the vehicle is reduced (in a state shown by a chain line in FIG. 1), and the lateral overturning support lines Sa1, Sb1 are reduced. If the lifting capacity in the side work area is reduced due to the shift toward the inside, but it is not desired to reduce the lifting capacity, the wrapping amount of the left and right inner cylinders 27, 27 with respect to the outer cylinder 26 is reduced, and the left and right inner cylinders are reduced. It is necessary to increase the amount of overhang of 27, 27, and set the lateral overturning branch lines Sa1, Sb1 as far as possible outside.

Reference numerals 29, 29 denote left and right fixing brackets which are mounted at positions on the front side of the outer cylinder 26 and opposed to the left and right vehicle frames 1a, 1a. The left and right fixed brackets
29, 29 are left and right cylindrical bodies 26c, 2 of the outer cylinder 26 in this embodiment.
6c are connected to each other, and when a bending force is applied to the
26 is attached to the left and right front positions of the reinforcing member 30 for preventing deformation in the front-rear direction. With this configuration, the deformation of the cylinders 26c, 26c is smaller than when the left and right fixing brackets 29, 29 are directly attached to the cylinders 26c, 26c, and the inner cylinder 27,
It has the effect that the 27 can slide smoothly,
When the strength of 26c, 26c is high, etc., the left and right fixing brackets 29, 29 may be directly attached to the cylindrical bodies 26c, 26c. Then, the left and right fixing brackets 29, 29 are fastened and fixed to the left and right vehicle frames 1a, 1a using fastening members (not shown) such as U bolts as in the conventional case.

At the rear position of the crane base 3, a substantially central portion of a support frame 16 having both ends 16a, 16a mounted on the left and right vehicle frames 1a, 1a is fixed similarly to the conventional one. Left and right fixing brackets 17, 17 provided at both end portions 16a, 16a of the support frame 16 are fastened and fixed to the left and right vehicle frames 1a, 1a using fastening members (not shown) such as U bolts. Have been. Further, both ends 16a, 16a of the support frame 16 are provided.
The connecting members 16b, 1b are used to prevent the ends 16a, 16a from being deformed toward the outer cylinder 26 by the bending force acting during the loading operation.
The outer cylinder 26 is fixed to the right and left appropriate positions using 6b. Note that the support frame 16 is located at the upper position and the outer cylinder 26.
And an upper plate (not shown) between the upper positions of the crane base 3,
Further, a bottom plate (not shown) may be attached between the lower position and the lower positions of the outer cylinder 26 and the crane base 3 to form a box structure. In this case, the deformation of the support frame 16 can be more effectively prevented.

The outer cylinder 26 thus configured is formed in a rectangular shape in plan view with its longitudinal central portion 26a bent toward the rear of the vehicle.
When 29 is arranged at the same position as the conventional one, the fixed position of the outer cylinder 26 with respect to the crane base 3 is closer to the rear than the conventional one, and the separation distance m1 between the outer cylinder 26 and the support frame 16 is Is shortened. For this reason, even if a bending force is applied to the crane base 3 from the telescopic boom 5 during loading work, the supporting span is short, so that no excessive stress is generated at the rear of the base, and the reinforcement of the crane base 3 is reduced and the weight is reduced. It can be configured at a low price.

Next, a second embodiment will be described with reference to FIG. In FIG. 3, reference numeral 32 denotes an outer cylinder of the outrigger device 31 formed of a single long cylindrical body. The outer cylinder 32
Is formed in a substantially circular arc shape in plan view, which is curved toward the rear of the vehicle at a predetermined curvature R, and has both ends 32b, 32b positioned near the vehicle side of the vehicle 1 in the longitudinal direction. A central portion 32a is attached to the crane base 3 at a position closer to the front. For this reason, both ends 32b, 32b of the outer cylinder 32 are inclined obliquely forward with respect to the longitudinal axis o of the vehicle 1. In addition, the cylindrical portion 32c of the outer cylinder 32 includes:
The cylindrical portions 33a, 33a are formed in an arc shape in plan view curved at substantially the same curvature R as the outer cylinder 32, and the left and right inner cylinders 33, 33 with the left and right jack devices 34, 34 suspended and fixed to the tips are slidable. It is inserted in. Therefore, when the left and right inner cylinders 33, 33 are pulled out to the side of the vehicle, the left and right jack devices 34, 34 are extended obliquely forward of the vehicle 1 as shown by the solid line in FIG.
The vehicle 1 can be installed at a position closer to the front of the vehicle 1 than at the ten installation positions (indicated by a dashed line). As a result, the position of the forward fall support line Sc2 is also closer to the front of the vehicle 1 than the conventional one, and the distance from the total center of gravity G can be increased by the amount that the forward fall support line Sc2 has shifted to the front of the vehicle. As a result, the lifting capacity in the front working area can be increased.

Reference numerals 35, 35 denote left and right fixing brackets mounted at front positions of the outer cylinder 32 and opposed to the left and right vehicle frames 1a, 1a. The left and right fixed brackets
35, 35 are fastened and fixed to the left and right vehicle frames 1a, 1a using fastening members (not shown) such as U bolts as in the conventional case. A substantially central portion of a support frame 16 having both ends 16a, 16a mounted on the left and right vehicle frames 1a, 1a is fixedly provided at a rear position of the crane base 3, similarly to the conventional one. The left and right fixing brackets 17, 17 provided at both ends 16a, 16a of the support frame 16 are fastened and fixed to the left and right vehicle frames 1a, 1a using fastening members (not shown) such as U bolts. .

The outer cylinder 32 thus configured has a central portion 32a in the longitudinal direction that is curved toward the rear of the vehicle in a circular arc shape in plan view.
In the case where 35 is arranged at the same position as the conventional one, the fixed position of the outer cylinder 32 with respect to the crane base 3 is closer to the rear than the conventional one, and the separation distance m2 between the outer cylinder 32 and the support frame 16 Is shortened. Therefore, even if bending force is applied to the crane base 3 during loading work, the supporting span is short, so that no excessive stress is generated at the rear of the base, and the reinforcement of the crane base 3 is reduced to make it lightweight and low-cost. It becomes possible.

Next, a third embodiment will be described with reference to FIG. In FIG. 4, reference numerals 371 and 372 denote left and right outer cylinders of the outrigger device 36 arranged in front and rear. The left and right outer cylinders 371, 372 are attached to the front and rear so that the one end openings 371b, 372b are located near the opposite vehicle side, and
In the attached state, substantially the entire area in the longitudinal direction is formed in an arc shape in plan view so as to be curved at a predetermined curvature R toward the rear of the vehicle. The central portion in the longitudinal direction is attached to a position closer to the front of the crane base 3. In addition, the cylindrical portions 371c and 372c of the left and right outer cylinders 371 and 372 have cylindrical portions 38,
The left and right inner cylinders 38, 38 are formed such that a, 38a are formed in an arc shape in plan view curved at substantially the same curvature R as the outer cylinders 371, 372, and the left and right jack devices 39, 39 are vertically fixed to the tip portions. It is inserted in. Therefore, if the left and right inner cylinders 38, 38 are pulled out to the side of the vehicle, the left and right jack devices 39, 39 are extended obliquely forward of the vehicle 1 as shown by the solid line in FIG.
The vehicle 1 can be installed at a position closer to the front of the vehicle 1 than at the 20 installation positions (shown by a dashed line). As a result, the position of the forward falling branch line Sc3 is also closer to the front of the vehicle 1 as compared with the conventional one, and the distance from the total center of gravity G can be increased by the amount that the forward falling branch line Sc3 has shifted to the front of the vehicle. Thus, the lifting capacity in the front working area can be increased.

In this embodiment, the left and right outer cylinders 37 are used.
Although the 1,372 is configured separately, the top plate and the bottom plate may be configured as a single member to be integrated. Further, as shown in FIG. 4, the rear outer cylinder 372 is attached to the front outer cylinder 371 with the other end inclined at the rear side of the vehicle by Δa, and the ground position of the rear jack device 39 in the jack extended state is set. , May be configured to be grounded at a position closer to the front. With this configuration, the problem that the outrigger device of this type originally has a problem that the grounding positions of the left and right jack devices are different in the front-rear direction is reduced, and the left and right lifting capacity in the front working area is reduced. Can be eliminated. This problem can also be solved by setting the curvature of the rear outer cylinder 372 smaller than the curvature of the front outer cylinder 371.

Reference numerals 40, 40 denote left and right fixed brackets which are mounted on the front side of the outer cylinder 371 located on the front side and opposed to the left and right vehicle frames 1a, 1a. The left and right fixing brackets 40, 40 are fastened and fixed to the left and right vehicle frames 1a, 1a using fastening members (not shown) such as U bolts as in the conventional case. At the rear position of the crane base 3, both ends 16a, 1
6a is mounted on the left and right vehicle frames 1a, 1a.
A substantially central portion of the support frame 16 is fixed, and both ends of the support frame 16 are fixed.
Left and right fixing brackets 17 provided on 16a, 16a are fastened and fixed to left and right vehicle frames 1a, 1a using fastening members (not shown) such as U bolts.

The left and right outer cylinders 371 and 372 configured as described above.
Is formed in a circular arc shape in a plan view, whose center in the longitudinal direction is curved toward the rear of the vehicle. Therefore, when the left and right fixing brackets 40 and 40 are arranged at the same position as the conventional one, The fixed position of the outer cylinders 371 and 372 is closer to the rear than the conventional one, and the separation distance m3 between the outer cylinder and the support frame 16 is shorter. Therefore, even if bending force is applied to the crane base 3 during loading work, the supporting span is short, so that no excessive stress is generated at the rear of the base, and the reinforcement of the crane base 3 is reduced to make it lightweight and low-cost. It becomes possible.

[0033]

According to the vehicle-mounted crane of the present invention, the outer cylinder of the outrigger device is formed in a rectangular shape with its central portion in the longitudinal direction bent toward the rear of the vehicle, or with the central portion in the longitudinal direction facing the rear of the vehicle. Formed into a curved arc shape in plan view,
Since the left and right jack devices are configured to extend obliquely forward with respect to the vehicle, the front fall-over branch line can be set at a position closer to the front of the vehicle as compared with the conventional one, and the lifting capacity in the front working area is increased. In addition, the fixed position of the outer cylinder with respect to the crane base is set at a position closer to the rear as compared with the conventional one, so that excessive stress is not generated in the crane base, and the reinforcement of the crane base 3 is reduced. It is lightweight and configurable at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory view (plan view) of a vehicle-mounted crane according to a first embodiment of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an explanatory view (plan view) of the second embodiment.

FIG. 4 is an explanatory view (plan view) of the third embodiment.

FIG. 5 is an explanatory view (side view) of a conventional vehicle-mounted crane.

FIG. 6 is a plan view of the same.

FIG. 7 is an explanatory view (plan view) of an outrigger device according to another embodiment.

[Explanation of symbols]

1; vehicle, 1a, 1a; vehicle frame, 2; cab, 3; crane base, 4; swivel post, 5; telescopic boom, 6; winch device, 7; wire rope, 8; hook block,
9; undulating cylinder, 10, 20, 25, 31, 36; outrigger device, 1
1,211,212,26,32,371,372; outer cylinder, 11a, 26a, 32a, 371a, 372
a; central portion in the longitudinal direction, 11b, 26b, 32b; opening at both ends, 211b, 212
b, 371b, 372b; one end opening, 26c, 32c, 371c, 372c; cylinder, 1
2,22,27,33,38; Inner cylinder, 12a, 22a, 27a, 33a, 38a; Tip, 1
3,23,28,34,39; jack device, 15,17,29,35,40; fixed bracket, 16; support frame, 18; rear wheel, 19; engine, 30;
Reinforcing member, A: Mobile crane, G: Total center of gravity, Sa, S
b; lateral fall branch line, Sc, Sc1, Sc2; forward fall branch line,

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F205 AA06 AC01 BA06 CA03 DA04 FA01 FA10

Claims (2)

[Claims] 1. A telescopic boom is mounted on a left and right vehicle frame located immediately behind a driver's cab of a vehicle, and a telescopic boom is pivotally mounted at a longitudinal central portion thereof so that openings at both ends are located near a vehicle side of the vehicle. Equipped with an outer cylinder fixed to the crane base and left and right inner cylinders that can be extended from both ends of the outer cylinder toward the side of the vehicle and have jack devices vertically attached and fixed at the tip. In an on-vehicle crane, the outer cylinder of the outrigger device has an L-shape in plan view in which a central portion in the longitudinal direction is bent toward the rear of the vehicle, or an arcuate shape in plan view in which substantially the entire area in the longitudinal direction is curved toward the rear of the vehicle. And a pair of left and right fixing brackets for fastening and fixing the outer cylinder to the left and right vehicle frames at a position on the front side of the outer cylinder and facing the left and right vehicle frames. At a rear position of the lane base, a substantially central portion of a support frame having both ends mounted on the left and right vehicle frames is fixed, and a pair of right and left is fixed to both ends of the support frame with the left and right vehicle frames. An on-vehicle crane comprising a fixed bracket attached. 2. The vehicle is mounted on left and right vehicle frames located immediately behind the driver's cab of the vehicle, and has one end opening side by side so as to be located near the opposite vehicle side of the vehicle. The left and right outer cylinders fixed to the crane base on which the telescopic boom is pivotably mounted, and the jack device can be extended from the opening at one end of the left and right outer cylinders toward the side of the vehicle, respectively, with the jack device hanging at the tip. In an on-vehicle crane provided with an outrigger device constituted by left and right inner cylinders fixed and fixed, substantially the entire left and right outer cylinders of the outrigger device are formed in an arc shape in a plan view curved substantially rearward in the longitudinal direction. At the same time, a pair of left and right fixing brackets for fastening and fixing the outer cylinder to the left and right vehicle frames are attached to positions on the front side of the outer cylinder located in front and facing the left and right vehicle frames, and At a rear position of the crane base, a substantially central portion of a support frame having both ends mounted on the left and right vehicle frames is fixed, and a pair of right and left is fixed to the left and right vehicle frames at both ends of the support frame. An on-vehicle crane comprising a fixed bracket attached.