JPH0578518B2 - - 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. That is, for example, a lift vehicle for high-altitude cargo handling work that uses a trolley to transport luggage between medium-to-high-rise buildings and the ground during a move, a lift vehicle for high-altitude firefighting work that uses a trolley to transport firefighters, equipment, etc. in the event of a fire, etc. It is related to.

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

That is, as shown in FIG. 6, FIG. 7, and FIG.
A trolley 3 is raised and lowered along the road, and a bucket 5 containing a load such as baggage 4 is transported between high places by the trolley 3. In other words, trolley 3
A pedestal 7 is pivotally supported via a tilt mechanism 6 or the like, and a bucket 5 is attached to this pedestal 7.

The boom 2 generally includes a first boom 13, which is in the mutual relationship shown in the side cross-sectional view of FIG.
It consists of a multi-stage structure including a second boom 14, a third boom 15, etc. Here, for example, the first boom 1
There are steps between the boom 3 and the second boom 14 and between the second boom 14 and the third boom 15, and the height levels between the socket portions serving as the respective connection portions are different. Therefore, it is necessary to take countermeasures when the cart 3 traveling on the boom 2 passes through this level difference.

Therefore, in the conventional example, as shown in the front cross-sectional view of FIG.
1 and the lower wheel 16, a spring 17 is interposed between the lower wheel 16 and the truck 3, or as shown in the front cross-sectional view of FIG. The central part of the V-shaped link 19 to which the wire 18 is attached is pivotally connected to the truck 3 by a pin 20, so that the lower wheels 1
6 is pressed into contact with the wall surface of the boom 2, thereby allowing the boom 2 to smoothly pass through the step.

In addition to the boom 2 shown in FIG. 3, there was also a boom 2 having a shape in which the height difference of each boom component was eliminated and the height level of the socket portion was made the same.
In this configuration, pairs of wheels with fixed mutual clearances were provided for each boom, as many as there were booms.

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

First, in the conventional example shown in FIGS. 4 and 5, there was a problem in the stability of the truck 3. In other words, if the load 4 or the like that is carried by the trolley 3 along the boom 2 is loaded at the rear end etc. and the center of gravity is biased, or if the center of gravity shifts due to sliding while going up and down, When passing over a step, the upper wheel 11 may lift off the boom 2, which may cause the cart 3 to deviate from the boom 2.
There was a risk that this could lead to a major accident such as the falling of cargo such as Luggage 4. Furthermore, in the conventional examples shown in FIGS. 4 and 5, a precise structure was required, the structure became complicated, and there were also problems in terms of cost.

In addition, in the case of using special wheels with a fixed clearance as described above, the shape of the boom 2 is specified, the number of wheels becomes large, etc., and the configuration becomes complicated, resulting in problems in terms of cost.

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

In view of the above circumstances, the present invention has been made to solve the problems of the conventional example. The purpose of the present invention is to propose a lift vehicle in which a substantially parallel movement mechanism is formed, and the wire of the drive mechanism is fixed at a predetermined location, so that the cart does not lift off from the boom and its structure is simple. do.

"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 loads such as luggage are transported by this truck.

This lift vehicle has the following boom, frame, and arm drive wire.

The boom has a rectangular tube shape with a space inside, has an opening in the wall surface along the longitudinal direction, and has an open side wall forming the opening.

The frame is disposed within the space of the boom, and clamps the opening side wall of the boom together with the truck via the attached running elements such as front and rear wheels and the corresponding running elements such as wheels of the truck.

The arms form a pair, and both ends of each arm are pivotally connected to corresponding front and rear ends of the truck and frame through the opening of the boom. In this way, the truck and the frame are arranged substantially parallel to each other, and the paired arms are also arranged substantially parallel to each other, thereby forming a substantially parallel movement mechanism.

A lowering wire of a drive mechanism stretched to drive a truck or the like is fixed to the truck, and a rising wire is fixed to the frame.

"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 the loaded object is transported by this truck.

That is, by sandwiching the open side wall of the boom together with the frame via the front and rear running elements of the truck and the front and rear running elements of the frame, the trolley is run on the open side wall.

This running is done by winding up the lifting wire of the drive mechanism fixed to the frame when the cart is raised, and by winding up the lowering wire of the drive mechanism fixed to the cart when lowering the cart. It is done by.

Here, a substantially parallel motion mechanism is formed by the truck, the frame, and the pair of pivotally connected arms,
The truck and frame are always maintained substantially parallel, and the paired arms are also always maintained substantially parallel.

Therefore, by winding up the lifting wire or the lowering wire stretched by the drive mechanism, the arm is appropriately raised and lowered, and the truck and frame are urged toward the opening side wall, so that both the front and rear running elements are always kept in the opening. The state in which it is pressed against the side wall is maintained.

Therefore, even if the load such as luggage is loaded on the rear end etc. and the center of gravity is biased, or if the center of gravity shifts due to sliding while ascending or descending, or even if the center of gravity moves through a step between the booms, etc. It is possible to reliably prevent any of the running elements from floating up from the opening side wall during elevating or the like.

Furthermore, prevention of these traveling elements from floating can be realized by the simple and easy configuration as described above.

"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. 6, 7, and 8.

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 8 is rotatably mounted on the chassis 1, and the boom 2 is attached to the turntable 8 by a cylinder 9 and a pivot pin 10 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 includes upper wheels 11 and runs on the boom 2 between its base end 2 ₁ and tip end 2 ₂ . In the illustrated example, this truck 3 has a pivot pin 12 on the truck 3.
It has a pedestal 7 for a loading platform, a workbench, etc., which is pivotally supported by the pedestal 3, and between the pedestal 3 and the pedestal 7 there is a tilt mechanism 6, etc. that controls the posture of the pedestal 7 horizontally and evenly and supports the pedestal 7 on the trolley 3. A control mechanism is provided. And a box-shaped bucket 5 that stores cargo such as luggage 4,
It is mounted on such a pedestal 7 and transported by the trolley 3.

In addition, in the figure, T is a truck for transporting luggage 4, etc.
M ₁ and M ₂ are workers.

The lift vehicle L is structured like this.

The following description will focus on FIGS. 1 and 2.

For example, as shown in FIG. 3, the boom 2 has a rectangular cylinder shape with a space 21 inside, and an opening 22 formed in the wall along the longitudinal direction, a first boom 13 and a second boom. 14, 3rd
It consists of a multi-stage boom such as 15. And the first boom 13, the second boom 14, and the third boom 15
are the opening side walls 13 ₁ , 1 which are the bent edges on both sides of the opening 22 on the wall surfaces forming the opening 22, respectively.
It consists of 4 ₁ and 15 ₁ , each of which is nested and has almost similar shapes.

The trolley 3 has both sides connected to the opening side walls 13 ₁ ,
Upper wheel _{, 1}
The first-class running elements are attached to the front and rear of both sides, and the upper wheels 11, etc. are connected to each boom 13, 14,
It runs on the left and right opening side walls 13 ₁ , 14 ₁ , 15 ₁ of 15 . In this example, a total of four upper wheels 11
are attached at predetermined locations, but the number and location of the attachment may be changed as appropriate.

This truck 3 uses, for example, a tilt mechanism 6 as an attitude control mechanism. This tilt mechanism 6
A shaft 24 that is mounted on the truck 3 by a bearing 23 and has a screw threaded thereon, a movable element 25 that uses a ball screw or the like that is screwed onto the shaft 24, and a movable element 25 between the movable element 25 and the frame 7, respectively. It is equipped with a connecting rod 26 which is pivotally connected at both ends. Therefore, by forward and reverse rotation of a handle 27 attached to the end of the shaft 24, the posture of the pedestal 7, which is pivotally supported on the trolley 3 via the movable element 25 and the connecting rod 26, can be changed, thereby changing the raising and lowering angle of the boom 2. Depending on the situation, the pedestal 7, the cargo 4, etc. can be controlled to a horizontal position.

The frame 28 is, for example, in the shape of a flat plate or a frame body with a rectangular cross section, and its length, width, etc.
According to. This frame 28 is disposed within the space 21 and is provided with running elements such as front and rear lower wheels 29, and includes an upper wheel 11 of the truck 3 and a lower wheel 29 of the truck 3.
The bogie 3 is run on the boom 3 by sandwiching the open side wall 13 ₁ or 14 ₁ or 15 ₁ of each boom 13 or 14 or 15. For example, the lower wheels 29 consist of a total of four wheels attached to the front and rear of both sides of the frame 28, but the number and position of the lower wheels 29 may be changed as appropriate, and the frame 28 is also not limited to this example. , one opening side wall 13
₁ , 14 ₁ , 15 ₁ and only one side of the truck 3 may have a long and narrow plate-like configuration.

The arms 30 form a pair and are connected to the opening 22 of the boom 2.
Both ends of each are connected to the trolley 3 and the frame 2 through
A pin 31 is attached to the front end and rear end corresponding to 8.
It is pivoted by etc. Therefore, the truck 3, the frame 28, and the arm 30 form a substantially parallel movement mechanism such as a parallel crank mechanism.
For example, two pairs of arms 30 form two sets of parallel crank mechanisms.

A spring 32 is interposed between the carriage 3 and the frame 28 through the opening 22, and tensions and biases these toward the opening side walls 13 ₁ , 14 ₁ , 15 ₁ as appropriate. In the illustrated example, one spring 32 is interposed between the central portion of the truck 3 and the rear end portion of the frame 28, but the number, position, etc. thereof can be changed as appropriate.

Reference numeral 33 denotes a lowering wire that is stretched and constitutes a drive mechanism for the truck 3, etc., and this lowering wire 33
One end is fixed to the trolley 3. One end of the lifting wire 18 is fixed to the frame 28.
The drive mechanism includes, for example, a sheave disposed at an appropriate location on the boom ₂ and a winch (not shown) attached to the proximal end 21 of the boom 2, etc. A wire 33 is stretched between the sheave and the winch. By rotating the winch forward and backward, the ascending wire 18 and the descending wire 33 are appropriately paid out and wound up, and the truck 3 is driven.

The above is the explanation of the configuration.

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

At the destination, first rotate, raise and extend the boom 2 on the chassis 1, and place the boom 2 at the target high place.
Place the tip sides 2 ₂ of the

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. 6).

The bogie 2 is constructed by sandwiching the opening side walls 13 ₁ , 14 ₁ , 15 ₁ , etc. through running elements such as the front and rear upper wheels 11 and running elements such as the front and lower lower wheels 29 of the frame 28 . are opening side walls 13 ₁ , 14 ₁ , 1
5 He runs on ₁ .

The traveling of this trolley 3 is carried out by operating a drive mechanism such as a winch, so that when ascending, the ascending wire 18 is wound up and the descending wire 33 is let out, and when descending, the ascending wire 18 is wound up and the descending wire 33 is let out. and winding up the lowering wire 33.

Here, for example, a parallel crank mechanism is formed by the truck 3, the frame 28, and a pair of arms 30 which are pivotally connected. A parallelogram whose upper and lower sides are the cart 3 and the frame 28 forms a link that is always maintained.

Therefore, the tensioned lifting wire 1 of the drive mechanism
8 and the lowering wire 33 are fed out and wound up, the arm 30 is appropriately raised and lowered, and the carriage 3 and the frame 28 are connected to the opening side walls 13 ₁ , 14 ₁ , 15 ₁
side, so that both the front and rear upper wheels 11 and lower wheels 29 always have open side walls 13 ₁ , 14 ₁ , 15
₁ is maintained under pressure.

Therefore, if the cargo 4, etc. is loaded on the rear end of the frame 7 and the center of gravity is uneven, or if the center of gravity shifts due to sliding while going up and down, each boom 13, 1
Even when passing through a step between 4 and 15,
It is possible to reliably prevent any of the running elements, particularly either the front or rear of the upper wheels 11 of the truck 3, from floating up from the opening side walls 13 ₁ , 14 ₁ , 15 ₁ .
That is, both the front and rear upper wheels 11 are attached to the truck 3 that constitutes the upper side of the parallel crank mechanism,
It is impossible for only one of them to move up and down independently when going up and down.

Also, to prevent these upper wheels 11 etc. from lifting,
This is realized by a simple and easy configuration as described above.

Furthermore, in the illustrated embodiment, a spring 32 is interposed at a predetermined location between the trolley 3 and the frame 28, and pulls and biases both toward the opening side walls 13 ₁ , 14 ₁ , 15 ₁ , so that the boom 2. When horizontal, etc.
The frame 28 is moved by its own weight to the opening side walls 13 ₁ , 1
4 ₁ , 15 ₁ can be prevented from leaving.

"Effects of the Invention" As explained above, the lift vehicle according to the present invention has an arm pivotally connected to the frame and the cart that clamps the opening side wall of the boom via the travel element to form a substantially parallel movement mechanism, and is driven. By fixing the wire of the mechanism to a predetermined location, even if the center of gravity of the load being carried by the trolley shifts or shifts, or when passing through the steps of each boom, the wheels of the trolley will remain fixed when going up and down, etc. The floating of the running element has been reliably prevented, the stability of the trolley is excellent, and the risk of accidents such as the trolley deviating from the boom and falling of the loaded object has been avoided.Furthermore, the structure is simple and cost-effective. Also excellent,
The effects it brings are significant, such as eliminating all the problems that existed in conventional lift vehicles of this type.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the lift vehicle of the present invention.
It is a front sectional view of the main part. FIG. 2 is a sectional view of the same side. FIG. 3 is a side sectional explanatory view of the boom.
FIGS. 4 and 5 are front sectional views of essential parts of lift vehicles according to conventional examples, respectively. FIG. 6 is a front view showing a typical example of work performed by a lift vehicle. 7 and 8 show a general lift vehicle, with FIG. 7 being a front view thereof and FIG. 8 being a plan view thereof. 1... Chassis, 2... Boom, 3... Trolley, 4...
...Luggage (load), 11...Upper wheel (travelling), 1
3...First boom, 13 ₁ ...Opening side wall, 14...
... Second boom, 14 ₁ ... Opening side wall, 15 ... Third boom, 15 ₁ ... Opening side wall, 18 ... Climbing wire, 21 ... Space, 22 ... Opening, 28
... Frame, 29 ... Lower wheel (running element), 30
... Arm, 33 ... Lowering wire, L ... Lift vehicle.

Claims (1)

[Scope of Claims] 1. A lift vehicle that is equipped with a boom that is rotatable, hoistable, and extendable on a chassis, and a bogie is raised and lowered along the boom, and a loaded object is carried by the bogie, which has a rectangular tube shape. Through the boom, which has an opening formed in the wall along the longitudinal direction, and the running elements of the trolley that correspond to the attached front and rear running elements, which are disposed in the internal space of the boom, an opening side wall forming an opening of the boom;
a frame that is clamped together with the trolley; both ends are pivotally connected to the corresponding front and rear ends of the trolley and the frame through the openings of the boom;
A lift vehicle comprising: a pair of arms that form a substantially parallel movement mechanism; and a lowering wire and a higher wire of a drive mechanism, each of which is fixed to the truck and frame, respectively. .