JPH0578520B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a lift vehicle such as an elevator vehicle or a ladder vehicle for working at high places. In other words, it relates to, for example, a lift vehicle for high-altitude loading and unloading work that uses a dolly to transport cargo between a high place and the ground during a move, a lift vehicle for high-altitude firefighting work that uses a dolly to transport firefighters, equipment, etc. in the event of a fire, etc. It is something.

``Conventional technology'' Such a lift vehicle has traditionally been as follows.

First, as shown in Figures 5, 6, and 7,
The lift vehicle L is equipped with a boom 2 on a chassis 1 that is rotatable, hoistable, and extendable, and a trolley 3 is raised and lowered along this boom 2. It was being transported to and from high places using trolley 3. That is, a pedestal 8 was attached to the truck 3 via a tilt mechanism 6 and the like and a pivot point 7, and the bucket 5 was loaded on this pedestal 8.

In this way, in the conventional example, as shown in FIG. Movement with respect to trolley 3 had become impossible.

"Problems to be solved by the invention" By the way, regarding such a lift vehicle L,
Conventionally, the following problems have been pointed out.

In other words, the loading and unloading of cargo 4, etc. onto the frame 8 on the ground side, which is the base end ₂₁ of the boom 2, is carried out.
The loading and unloading work will be as follows. The ground clearance H ₁ of the pedestal 8 is not only limited by the total length S of the trolley 3 but also depends on the thickness T of the boom 2 and the undulation angle α, and the larger the undulation angle α becomes, the higher the ground clearance H ₁ becomes.
was getting higher. This ground height _H1 reached, for example, about 150 cm above the ground.

Therefore, when loading and unloading the cargo 4 etc. onto the frame 8, the worker _{M 1 is} required to lift and unload the cargo 4 etc. with respect to this high ground clearance H ₁ . It was becoming a huge burden. In particular, if the weight of the luggage 4 etc. is large, it will place a large burden on the physical strength of worker _M1 .
This was causing problems in terms of work efficiency.

Such a point has been pointed out in the conventional lift vehicle L.

In view of these circumstances, the present invention has been made to solve the problems of the conventional example described above.The present invention has been made in order to solve the problems of the conventional example described above. The purpose of the present invention is to propose a lift vehicle which can set the ground clearance of the pedestal low by attaching the pedestal and has a simple configuration.

"Means for Solving the Problems" The technical means of the present invention to achieve this objective are as follows.

A lift vehicle is equipped with a boom that can be rotated, raised and lowered, and extended and retracted on a chassis, and a truck is raised and lowered along this boom, and cargo and the like are transported by this truck.

This lift vehicle has the following support stand and mount.

That is, the support stand is assembled to a truck, and is movable by a moving means between the front and rear ends of the truck.

The gantry is attached to a support base via a pivot point and an attitude control mechanism such as a tilt mechanism that controls and maintains the attitude, and cargo and the like are loaded onto the gantry.

"Function" Since the lift vehicle according to the present invention is comprised of such means, it functions as follows.

At the destination, first rotate the boom on the undercarriage,
Raise and extend and position the tip of the boom opposite the target high location.

A truck is raised and lowered along this boom, and cargo and the like are transported by this truck.

Now, loading and unloading of cargo onto and from the gantry on the base end side of the boom, that is, on the ground side, is carried out as follows.

First, the support stand is moved to the rear end side of the cart by the moving means. Therefore, the pedestal, which is maintained in a horizontal position on the support base by the attitude control mechanism and the pivot point, is also moved toward the rear end of the truck, that is, toward the base end of the boom and toward the ground.

Therefore, the ground clearance of this frame is almost no longer restricted by the overall length of the truck, and is only slightly influenced by the thickness and undulation angle of the boom.

In this way, it becomes possible to set the ground clearance of the pedestal lower than before, and the work of loading and unloading goods, etc. onto the pedestal by an operator becomes significantly easier.

Moreover, as mentioned above, since the conventional truck is utilized and the support base is incorporated into it, the structure is simple.

"Example" The present invention will be described in detail below based on the example shown in the drawings.

First, the lift vehicle L will be outlined with reference to FIGS. 5, 6, and 7.

As the lift vehicle L, in addition to the self-propelled type shown in the figure, a towed type that does not have driving power is also possible.

The lift vehicle L is provided with a boom 2 on a chassis 1, which is rotatable, hoistable, and extendable. That is, a turntable 10 is rotatably mounted on the chassis 1, and a boom 2 is attached to the turntable 10.
is attached by a cylinder 11 and a pivot pin 12 so as to be able to rise and fall.

This boom 2 is made of a multi-stage type that can be extended and contracted.
Expansion and storage of the second and subsequent stages are performed by unwinding and winding up a wire (not shown) stretched between predetermined locations, but methods using cylinders instead of wires, and various other expansion and contraction methods are also possible. is possible. The boom 2 may be a nested multi-stage boom, a ladder-like multi-stage boom, a boom with a substantially square cross section, a boom with a substantially flat cross section, or various other methods and shapes. Furthermore, in addition to such a direct extension type,
A refracting type boom 2 and a combination of these types are also possible.

A truck 3 is raised and lowered along the boom 2. That is, the truck 3 is equipped with wheels 9 and runs on the boom 2 between its base end 2 ₁ and tip end 2 ₂ .

In the figure, M ₁ and M ₂ are workers.

The lift vehicle L is structured like this.

This will be explained below with reference to FIGS. 1, 2, and 3.

The trolley 3 is made of, for example, a substantially square-shaped frame body, has wheels 9 attached under a front end 13 and a rear end 14, and runs on the boom 2 from the base end 2 ₁ to the front end 2 ₂ . Ru.

The support stand 15 is movably assembled to the cart 3, and includes, for example, a pair of front and rear frames 16.
and left and right support frames 17 that connect the corresponding ends of the front and rear frames 16.A shaft body may be used as the front and rear frames 16. Various shapes and structures, such as a flat plate shape, are possible.

The moving means 18 makes the support stand 15 movable with a limit of movement between the front end 13 and the rear end 14 of the truck 3. As this transportation means 18,
For example, wheels 19 attached to each corner of the support stand 15, and wheels 19 attached to both sides of the inside of the truck 3.
A guide section 20 is provided for guiding. 2
1 is a fixing pin, and this fixing pin 21 is attached to the trolley 3.
is inserted into a corresponding engagement hole (not shown) provided in the support frame 17 of the support base 15 through an engagement hole 22 bored in the center of the front end 13 of the It functions to fix and hold the support stand 15 on the trolley 3 during non-operation. Further, the frames of the front end 13 and rear end 14 forming the truck 3 also function as a stopper for regulating the limit of movement of the support base 15.

The frame 8 consists of a loading platform, a workbench, etc., and includes a posture control mechanism that controls and maintains the posture, and a bracket 2.
3 and 24 and a pivot point 25 such as a pin, it is mounted on the support base 15.

As this posture control mechanism, for example, a tilt mechanism 6 is used. The tilt mechanism 6 includes a shaft 27 mounted under the pedestal 8 by a bearing 26 and having a screw threaded thereon, and a movable element 28 using a ball screw or the like that is screwed onto the shaft 27.
A connecting rod 29 is provided between the movable element 28 and the support base 15, each of which has both ends pivotally connected thereto. Therefore, the handle 3 attached to the end of the shaft 27
By the forward and reverse rotation of 0, the mover 28 and the connecting rod 2
9, the posture of the pedestal 8 pivotally supported by the movable table 15 is variable, and thus the pedestal 8, the cargo 4, etc. can be controlled to a horizontal posture, etc. according to the undulation angle α of the boom 2.

Reference numeral 31 denotes a hanging lowering wire that constitutes a drive mechanism for the truck 3 and the like; this lowering wire 31
One end is fixed to the trolley 3. One end of the lifting wire 32 is fixed to the support base 15 through an opening of the truck 3 or the like. The drive mechanism includes, for example, a sheave disposed at an appropriate location on the boom 2 and a sheave provided at an appropriate location on the boom 2.
A winch or the like (not shown) attached to the proximal end 2 ₁ or the like is provided, and the ascending wire 32 and descending wire 31 are stretched between the sheave and the winch. Therefore, by rotating the winch forward and backward, the ascending wire 32 and the descending wire 31 are appropriately paid out and wound up, and the truck 3 is driven. In addition, when raising, the support stand 15 is first moved to the front end 13 side of the truck 3, and then the truck 3 starts running.

The above is the explanation of the configuration.

Next, the operation of this lift vehicle L will be explained.

At the destination, first, the boom 2 on the chassis 1 is rotated, raised and extended, and the tip side 2 ₂ of the boom 2 is positioned opposite to the target high place.

Then, a truck 3 is raised and lowered along the boom 2, and cargo 4 and the like are transported by the truck 3 (see FIG. 5).

Now, loading and unloading of the cargo 4 and the like onto and from the gantry 8 on the base end ₂₁ of the boom 2, that is, on the ground side, is carried out as follows.

First, the trolley 3 is positioned on the base end side 2 ₁ of the boom 2 by letting out the lifting wire 32 and winding up the lowering wire 31 .

In the illustrated example, the support base 15 is removed by removing the fixing pin 21 inserted into the engagement hole 22 etc.
As the wheels 19 of the moving means 18 are guided by the guide section 20 and roll, the front end 1 of the truck 3 is rotated.
It moves from the 3 side to the rear end 14 side by its own weight.

Therefore, the pedestal 8 is mounted on the support 15 in a horizontal position using the tilt mechanism 6 etc. and the pivot point 25.
is also moved to the rear end 14 side of the truck 3, that is, the base end side 2 ₁ of the boom 2, and to the ground side.

Therefore, the ground height H ₂ of this frame 8 is hardly restricted by the total length S of the truck 3, and is only slightly influenced by the thickness T and the undulation angle α of the boom 2.

In this way, the ground height _H2 of this frame 8 is
It is possible to set the ground clearance significantly lower than the ground clearance _H1 of the conventional example. Motsute worker M ₁ (see Figure 5)
The work of loading and unloading the cargo 4, etc. onto the frame 8 is dramatically facilitated.

Sometimes, when loading/unloading cargo 4 etc. by lowering the ground clearance _H2 of this frame 8, for example, when the boom 2 has a large undulation angle α and the lifting wire 32 is loosened, etc. Under these conditions, there is a risk that the truck 3 may come off the boom 2 and an accident may occur. Therefore, for example, if an appropriate locking means (not shown) is provided between the front end 13 of the truck 3 and the boom 2 and the truck 3 is configured to be locked to the boom 2 during work, the truck 3 can be moved away from the boom 2. Accidents caused by coming off, etc., will be completely prevented.

Moreover, as mentioned above, since the conventional truck 3 is utilized and the support stand 15 is incorporated therein, the structure is simple and the increase in overall weight is extremely small.

After loading and unloading the cargo 4 and the like onto and from the frame 8, the support base 15 is first moved on the trolley 3 from the rear end 14 side to the front end 13 side by winding up the lifting wire 32. Thereafter, by winding up the ascending wire 32 and letting out the descending wire 31, the trolley 3 together with the support base 15, mount 8, etc. travels on the boom 2 from its base end 2 ₁ to its distal end 2 ₂ . I'm going to be done.

In addition, in the above-mentioned embodiment, the lifting wire 3
Since one end of the boom 2 is fixed to the support stand 15, the support stand 15 is always located on the rear end 14 side of the trolley ₃ on the base end side 21 of the boom 2, and
It is easy to set the ground clearance low, and the tip end side 2 ₂ of the boom 2 is located on the front end 13 side of the truck 3. Therefore, on either side of the boom 2, it is extremely easy to load the cargo 4 etc. onto the pedestal 8 and to unload it from the pedestal 8.

For example, by providing engagement holes similar to the engagement holes 22 at appropriate locations on the sides of the cart 3 and the support frame 17 of the support stand 15, the support stand 15 can be connected to the front end 13 and the rear end of the cart 3. It is also possible to move it to an appropriate position between 14 and hold it in position with the fixing pin 21. With this, the ground height of the frame 8 can be finely adjusted to the optimum height for the work, and the work of loading and unloading the cargo 4 can be further facilitated.

"Effects of the Invention" As explained above, the lift vehicle according to the present invention has a support base movably attached to the trolley, and a pedestal mounted on the support base via an attitude control mechanism and a pivot point. When loading and unloading cargo, etc. onto and unloading the platform, it is possible to set the platform's ground clearance low, which reduces the load on the worker, especially when the weight of the cargo is large. This significantly reduces the physical burden on workers, greatly contributing to work efficiency, and the structure is simple and excellent in terms of cost and weight, eliminating all the problems that existed with conventional lift vehicles of this type. The effects it produces are remarkable and great.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the lift vehicle of the present invention.
FIG. 3 is a front view of main parts. Figure 2 is the − of Figure 1.
FIG. 3 is a cross-sectional view taken along the line. FIG. 3 is a perspective view showing the support stand and the like. FIG. 4 is a front view of the main parts of a conventional lift vehicle. FIG. 5 is a front view showing a typical example of work performed by a lift vehicle. 6 and 7 show a general lift vehicle, with FIG. 6 being a front view thereof and FIG. 7 being a plan view thereof. 1... Chassis, 2... Boom, 3... Trolley, 4...
...Luggage, 6...Tilt mechanism, 8...Rack, 13...
...Front end, 14...Rear end, 15...Moving table, 1
8... Transportation means, 25... Pivot point, L... Lift vehicle.

Claims (1)

[Scope of Claims] 1. A lift vehicle that is provided with a boom that is rotatable, hoistable, and extendable on a chassis, and a trolley is raised and lowered along the boom, and cargo, etc. is transported by the trolley, comprising: It is assembled into a support stand that is movable by a moving means between the front and rear ends of the cart, and is attached to the support stand via an attitude control mechanism that controls and maintains the attitude and a pivot point, and cargo, etc. A lift vehicle characterized by comprising a frame for loading.