JPH0544393Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a lift vehicle. In other words, for example, when moving, there is a lift truck for high-altitude loading and unloading work that transports cargo along a boom between the ground and a high-altitude target, and in the event of a fire, it is used to transport firefighters, equipment, evacuees, etc. Related to lift vehicles for high-place fire extinguishing work that similarly transports, and lift vehicles for high-place work that work on targets at high places using similarly transported workers, materials, etc. at construction sites, etc. It is.

``Prior Art'' When using such a lift vehicle, it is necessary to take measures to prevent the cart, etc. from separating from the inclined boom and falling backwards when transporting cargo.

Therefore, conventionally, as shown in the side cross-sectional view of FIG. 5, for example, arms 3 which are pivoted downward by pins 2 are provided on both sides of the cart 1, and a lower wheel 4 is attached to one end of each of the arms 3. The other ends of both arms 3 were connected at the center, etc., and a wire 5 for lifting the lifting mechanism was attached.

Then, by the tensile force of the wire 5 corresponding to the weight of the truck 1 etc., the lower wheel 4 is biased and pressed against the inner wall of the rail section of the boom 6 via the arm 3, and the lower wheel 4 and the upper wheel 7 of the truck 1 are brought into contact with each other. This was clamped and clamped from above and below to prevent the trolley 1 from separating from the boom 6.

In addition to the example shown in Fig. 5, other measures to prevent backward overturning include a method in which a spring is interposed between the bogie 1 and the lower wheels 4, and various other similar methods. 1 had become unable to separate from boom 6.

"Problems that the invention attempts to solve" By the way, the following problems have been pointed out in such conventional examples.

First, when such a trolley 1 passes through the joint of the boom 6, an impact is applied to the trolley 1, causing it to vibrate greatly, causing the load 8 to collapse, which has become a problem. .

That is, for example, as shown in _the side cross-sectional view of FIG.
exists, and the plate thickness changes only in that part. Therefore, when the lower wheel 4 and the upper wheel 7 pass through the joints between the respective socket portions ₆₁ , they cannot follow this smoothly, and the impact is transmitted to the truck 1, causing it to rattle and vibrate greatly. Therefore, there is a risk that the cargo, etc. 8 carried by the trolley 1 may collapse, or the upper wheel 7 may lift off from the boom 6, causing the cargo, etc. 8 to fall, which has been a problem.

Next, at the tip 6 ₂ of the boom 6, the trolley 1
When only the loading platform 9 loaded with luggage etc. 8 from above was slid to the target side at a high place in front, a forward overturning moment was applied, and there was a danger that the cart 1 etc. would overturn forward.

That is, for example, as shown in the side sectional view of FIG. 7, a pedestal 10 is horizontally pivoted on the trolley 1, and a loading platform 9 for loading luggage, etc. 8 is slidably provided on the pedestal 10. Then, when the trolley 1 reaches the tip ₆₂ of the boom 6 and slides the loading platform 9 from the mount 10 toward the middle-to-high-rise building 11, which is the target at a high place facing forward, the mount 10 on which the trolley 1 is attached,
There was a danger that the carrier, along with the cargo platform 9 and the cargo 8, would separate from the boom 6 and fall forward using the front upper wheel 7 as a fulcrum. As mentioned above, it was also pointed out that there was a risk that the luggage etc. 8 would collapse or fall.

Therefore, in order to avoid such risks, conventionally,
A separate dedicated front fall prevention device 12 was provided. That is, a locking member 12 ₁ is provided at an appropriate location on the tip end 6 ₂ of the boom 6, and a corresponding locking member 12 ₂ is also provided at the rear end of the truck ₁ . 12 _{The two} were locked together to prevent the vehicle from falling forward. However, providing such a dedicated front fall prevention device 12
There was a problem that the configuration became complicated and the cost increased accordingly.

This point was pointed out in the conventional example.

In view of these circumstances, the present invention was developed to solve the problems of the conventional methods described above. The upper and lower wheels tighten and hold the boom from above and below through the shaft, balance section, tension rod, arm, etc., firstly to prevent the truck from falling backwards, and secondly to prevent the truck from falling forward when the platform slides. We propose a lift vehicle that will prevent the vehicle from falling over, and thirdly, will significantly reduce the impact when the truck passes through the joints of the boom.Furthermore, this will be achieved simply, easily, and reliably with a single mechanism. The purpose is to

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

This lift vehicle is equipped with a boom that is mounted on the vehicle body so that it can be raised and lowered and extended and retracted, and a truck with upper wheels that is raised and lowered along the boom by an elevating mechanism. It is something that

This lift vehicle includes the following brackets, arms, retaining plates, shafts, tension rods, etc.

The brackets are fixedly attached to the front and rear sides of the truck, facing downward and left and right, respectively.

Each arm is pivotally connected to the bracket at its center and has a lower wheel attached to one end.

The holding plate portion is fixed to the cart downwardly and laterally between the front and rear brackets, and is provided with an elongated hole in the lateral direction.

The shaft is held across between the elongated holes of the holding plate and is movable within the elongated holes.The wire of the elevating mechanism is attached to the center of the shaft, and balance parts are fixed to both ends of the shaft. It's bright.

The tension rod consists of a front and a rear tension rod whose both ends are pivotally connected between the other ends of the front and rear arms and the balance section, respectively.

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

The boom on the vehicle body is raised and extended, and the tip of the boom is first positioned facing a high target.
Then, the cart is raised and lowered by a lifting mechanism along this boom, and cargo and the like are transported between the ground and a high place.

Here, the upper and lower wheels are securely clamped and clamped at each point on the left and right of the front and back of the truck from above and below by the tensile force of the wire of the lifting mechanism corresponding to the weight of the truck, etc. It's summery.

That is, the shaft to which such a wire is attached is stretched between elongated holes in a holding plate part fixed to the truck, and balance parts are fixed to both ends of the shaft. Therefore, due to the tensile force of the wire,
A state in which the lower wheel presses the boom from below through the shaft, balance section, intervening tension rod, arm pivoted to the bracket, etc., and the boom is clamped and clamped from above and below together with the upper wheel of the bogie. It is becoming.

Therefore, when transporting cargo, etc., firstly, the lower wheel on the front side reliably prevents the trolley etc. from separating from the inclined boom and falling backwards.

Secondly, even when only the loading platform is slid forward from the cart at the tip of the boom, the cart is reliably prevented from tipping over forward, especially with the lower wheels on the rear side, without the need for any special equipment. Ru.

Thirdly, when the truck passes through the boom joint,
Since the shaft moves within the elongated hole of the holding plate, the balance section does not rotate, and the front and rear lower wheels are displaced separately, allowing the distance between them and the upper wheel to be changed appropriately. In this way, it is possible to smoothly follow the steps at the joints of the boom and changes in plate thickness, and the impact, rattling, vibration, etc. of the bogie are significantly alleviated.

And these can be easily realized by such a single mechanism.

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

First, I will give an overview of the lift vehicle.

Figures 8 and 9 show a typical lift vehicle.
An example is shown, FIG. 8 is a side cross section thereof, and FIG. 9 is an explanatory diagram of its operation.

In addition to the self-propelled type shown in the figure, the lift vehicle also includes a towed type and a portable type that do not have driving power, and both have a boom mounted on the wheel body 13 so that it can be raised and retracted, and in the example shown, it can be rotated. It is equipped with 6. A truck 1 is raised and lowered along this boom 6, and a pedestal 10 is horizontally pivoted on the pedestal 1, and a loading platform 9 for loading luggage, etc. 8 is slidably provided on the pedestal 10. Baggage, etc. 8, that is, cargo, people, equipment, materials, etc., are transported between the ground and a target at a high place, such as a mid-to-high-rise building 11, by raising and lowering the trolley 1.

To describe the boom 6 in detail, a turntable 14 is mounted on a vehicle body 13 and can be rotated by a drive device (not shown) such as a hydraulic rotating motor that can rotate forward and backward.
A boom 6 is pivotally supported on the lifting platform by a driving device such as a hydraulic lifting cylinder 15 and a pin 16 so that it can be raised and lowered. The boom 6 is of an extendable multi-stage type, and the second and subsequent stages are extended and retracted by a driving mechanism (not shown) using a cylinder, wires, etc. Examples of the boom 6 include a nested multi-stage boom and other ladder-like multi-stage booms, as well as a boom having a roughly U-shaped cross section with both side ends bent to the inside dimensions to form rail inner walls as in the illustrated example described below, a boom having a roughly square cross section, a roughly flat cross section, a straight-extending type, a bent type, and various other types and shapes.

To explain the truck 1 in detail, the truck 1 is raised and lowered along the boom 6 by its elevating mechanism (not shown). That is, the truck 1 is provided with upper wheels 7 on the front, rear, left and right sides, and its elevating mechanism includes a winch device and wires. Then, the bogie 1 moves over the boom 6 at its base end 6 ₃ by paying out and winding up the wire stretched across the front and back using a hydraulic winch device for lifting and lowering that can rotate forward and backward.
and the tip ₆₂ . On this trolley 1,
A pedestal 10 is pivotally supported by a pin 16, and this pedestal 1
A loading platform 9 is provided on the vehicle 0 so as to be horizontally slidable forward. Then, the above-mentioned luggage 8 is loaded onto, for example, a box-shaped loading platform 9 with an open top.

For example, a tilt mechanism 1 is provided between the trolley 1 and the pedestal 10.
A horizontal maintenance mechanism such as No. 7 is interposed, and the platform 10, the loading platform 9, the cargo, etc. 8 are always adjusted and maintained in a horizontal position on the trolley 1 according to the up-and-down angle of the boom 6.

In the figure, 18 is a wheel provided on the vehicle body 13 of the lift vehicle, and 19 is an outrigger that is a jack for stably holding the lift vehicle on the ground or the like.

The lift car generally looks like this.

Each component of the present invention will be explained below.

1 and 2 show essential parts of an embodiment of a lift vehicle according to the present invention, with FIG. 1 being a side view thereof, and FIG. 2 being a partially cutaway plan view thereof. FIG. 3 is an enlarged plan sectional view of the main part.

Reference numeral 20 denotes a truck frame of the truck 1, and a total of four brackets 21 are fixedly installed at the front, rear, left and right sides of both side frames of the truck frame 20, with their upper ends facing downward. These four brackets 21
In the illustrated example, each of these is composed of a set of two long plates sandwiching both side frames of the truck frame 20.

The arm 22 is located between both elongated plates at the lower end of each bracket 21, and has a pin 23 at its center.
It is pivoted by. In the illustrated example, the arm 22 is constituted by a pair of substantially L-shaped plates, and a lower wheel 24 is attached to the outside of one lower end of the arm 22 . These four lower wheels 24 are in a positional relationship in which they are opposed to the above-mentioned upper wheel 7 of the truck 1 from above and below, respectively, via the bent rail inner wall of the boom 6.

The holding plate portion 25 is fixedly attached to the truck frame 20 facing downward at approximately the center between the front and rear brackets 21, and has an elongated hole 26 in the lower part in the horizontal direction. It is composed of left and right plates, which are made up of two plates with each side in between. The vertical height of the elongated hole 26 is determined to be commensurate with the diameter of both ends of the shaft 27, which will be described later, and the horizontal length of the elongated hole 26 is determined to be commensurate with the forward and backward distance of the tension rod 28, which will be described later. ing.

The shaft 27 has both ends inserted into the elongated holes 26 of both holding plate parts 25, is held across the elongated holes 26, and is guided within the elongated holes 26 to be able to move forward and backward. There is.

The wire 5 of the lifting mechanism is attached to the center of the shaft 27, and balance parts 29 are fixed to both ends of the shaft 27. First, in the center of the shaft 27, there are two mounting plates 3.
0 is fixed, and a pin 3 is attached at the bottom of this mounting plate 30.
1, a wire 5 is rotatably attached. The balance portion 29 is composed of a pair of two plates fixed to both ends of the shaft 27, and in the illustrated example, the balance portion 29 is formed between the two plates of the aforementioned holding plate portion 25, that is, the elongated hole 26 thereof. Located in between. In the illustrated example, this balance section 29 is also constituted by a set of two plates.

The tension rod 28 is connected to the front and rear arms 2.
Both end portions of the balance portion 29 are pivotally connected between the other end portion of the upper side of the balance portion 2 and the balance portion 29, and a total of four pieces are disposed on the front and rear and left and right sides.

That is, both ends of the front tension rod 28 are connected to the pin 3 between the plates at the other end of the front arm 22 and between the plates of the balance section 29.
It is pivoted by 2. Such front tension rods 28 are provided on both the left and right sides. Similarly, both ends of the rear tension rod 28 are pivotally connected between the plates at the other end of the rear arm 22 and between the plates of the balance section 29 by pins 32, respectively. Such rear tension rods 28 are provided on both the left and right sides.

Also, the tension rod 28 on this side and the tension rod 28 on the rear side are
Pin 32 is the pivot point of the former, and pin 3 is the pivot point of the latter.
It is pivoted above 2. and pin 32 of the latter, that is, the rear tension rod 28.
is arranged near the fixed location of the balance part 29 and the shaft 27.

The lift vehicle according to the present invention is designed as described above.

The operation etc. will be explained below.

FIG. 4 is a side view of the main parts used to explain the operation, and the following description will be made with reference to FIG. 4 as well.

At the destination, the boom 6 on the vehicle body 13
First, the tip end ₆₂ of the boom 6 is positioned facing a mid-to-high-rise building 11, which is a high target. Next, the trolley 1 is raised and lowered by the lifting mechanism along this boom 6, and the cargo, etc. 8 is lifted onto the loading platform 9.
(See Figures 8 and 9, etc.).

Here, a trolley 1, cargo etc. 8, a loading platform 9, a pedestal 10, etc. (see Fig. 5, Fig. 8, Fig. 9)
Due to the tensile force of the wire 5 of the lifting mechanism corresponding to the weight of It is becoming.

That is, the shaft 2 to which the wire 5 is attached
7 is the elongated hole 2 of the holding plate portion 25 fixed to the trolley 1.
6, and a balance part 29 is fixedly installed at both ends thereof. So wire 5
Due to the tensile force of the shaft 27, the balance part 2
9. Tension rod 28 interposed by pivot connection;
A lower wheel 24 strongly urges and presses the inner wall of the rail portion of the boom 6 from below via an arm 22 and the like pivotally connected to a bracket 21 fixed to the truck 1. Together with the upper wheel 7 of the trolley 1, the inner wall of the rail portion of the boom 6 is clamped from above and below.

For example, as shown in FIG. 4, if the weight of the truck 1, luggage etc. 8, loading platform 9, pedestal 10, etc. is W, and the angle of inclination due to ups and downs of the boom 6 is θ, then the tensile force F of the wire 5 is Wsinθ. Then, the above-mentioned biasing pressure welding and clamping are performed by the component force, and the following first,
It operates as described in detail in the second and third sections.

First of all, when transporting cargo 8, etc., the lower wheels 24 on the front side reliably prevent the trolley 1 etc. from separating from the inclined boom 6, floating up, and falling backwards.

That is, as shown in FIG. 4, the above-mentioned wire 5
The tensile force F is a component force with the shaft 27 as the fulcrum.
F ₁ , and this component force F ₁ is transmitted through the front tension rod 28 and arm 22 to the front pin 23
The force changes to a component force F ₂ with F as the fulcrum. The front lower wheel 24 is biased and pressed against the boom 6 by this component force F ₂ . As mentioned above, the boom 6 will be clamped and clamped. So trolley 1
Let F ₂ ' be the force that tends to cause the cart 1 etc. to fall backwards, and as long as F ₂ > F ₂ ' holds true, the cart 1 etc. will be prevented from falling backwards.

In this way, falling backwards is prevented.

Second, at the tip ₆₂ of the boom 6, when only the loading platform 9 is slid from the platform 10 of the truck 1 toward the mid-to-high-rise building 11 in front (see FIGS. 8 and 9), the truck 1 also moves forward. The lower wheel 24 on the rear side can reliably prevent the vehicle from falling over without requiring any special equipment.

That is, as shown in FIG. 4, the above-mentioned wire 5
The tensile force F of the pin 3 on the upper side of the balance part 29 is
2 as a fulcrum and becomes a component force _F3 , and this component force _F3 changes to a component force _F4 via the tension rod 28 and arm 22 on the rear side with the pin 23 on the rear side as a fulcrum. Then, due to this component force F ₄ , the rear lower wheel 2
4 is biased and pressed against the boom 6. As mentioned above, the boom 6 will be clamped and clamped. Therefore, if the force that tries to tip the first truck forward is F ₄ ′, as long as F ₄ > F ₄ ′ holds,
This will prevent the truck 1 etc. from falling forward.

In this way, the trolley 1, together with the platform 10, the cargo platform 9, and the cargo 8, will not be separated from the boom 6, and the moment acting on the trolley 1, etc. will definitely cause it to fall forward using the vicinity of the front upper wheel 7 as a fulcrum. is prevented. Moreover, this is accomplished without the need for specialized equipment.

A forward fall is thus prevented.

Thirdly, when the truck 1 passes through the joint of the boom 6, the following happens.

That is, in this case, the shaft 27 is
5, the balance part 29 does not rotate, and the front and rear lower wheels 24 can be displaced separately to appropriately change the distance between them and the upper wheel 7. In this way, it is possible to smoothly follow the difference in level between the joints of the inner wall of the rail portion of the boom 6 and the changes in plate thickness, and the impact, rattling, vibration, etc. of the bogie 1 can be significantly alleviated.

For example, when the trolley 1 moves forward and ascends on the inclined boom 6, the process of overcoming the step A at the joint of the socket portion ₆₁ of the boom 6 is as follows. First, the front lower wheel 24 is displaced substantially downward, increasing the distance from the front upper wheel 7, and the arm 22 rotates counterclockwise about the pin 23. The front tension rod 28 is then pulled and moved forward.

Now, here, the balance part 29 does not rotate counterclockwise, but instead the shaft 27 moves forward in the elongated hole 26 of the holding plate part 25 from its usual central position, and as a result, the balance part 29 also moves forward. We will move forward with this. This is because the rear upper wheel 7 and lower wheel 24 clamp and hold the boom 6, so that the rear tension rod 28, which is pivotally connected to the balance part 29, cannot move back.

Even if the distance between the front upper wheel 7 and the lower wheel 24 increases in this way, the rear upper wheel 7 and the lower wheel 24
This means that the conventional spacing is maintained without being affected by this.

Although the case where the front upper wheels 7 and the lower wheels 24 pass through the step A has been described here, when the rear upper wheels 7 and the lower wheels 24 pass through the step A, it is also possible to Even when the truck 1 moves backwards or descends, the upper wheels 7 and the lower wheels 24 can always individually and smoothly follow changes in the thickness of the boom 6, as described above.

The aforementioned component forces F ₂ and F ₄ keep the front and rear, left and right lower wheels 24 in pressure contact with the boom 6 and sandwich them together with the upper wheels 7, so vibrations of the truck 1 are significantly reduced. be done.

In this way, changes in the thickness of the boom 6 can be followed smoothly.

The first, second, and third points described above can be easily achieved by one mechanism.

In addition, at each of the first and second points mentioned above, the component force F ₂ or F ₄ can be optimally adjusted by changing the length of each arm 22 to the pin 23, which is the pivot point. There is also a large degree of freedom in design.

"Effects of the invention" As explained above, the lift vehicle according to the present invention, when transporting cargo, etc., uses the tensile force of the wire of the lifting mechanism corresponding to the weight of the cart, etc. to lift the shaft, balance part, tension rod, arm, etc. The upper wheels and lower wheels clamp and hold the boom from above and below, resulting in the following results. Firstly, it prevents the cart from falling backwards, secondly it also prevents the cart from tipping forward when the loading platform slides, and thirdly, the impact when the cart passes through the joints of the boom is significantly reduced, allowing the cargo to be There is no risk of the cargo collapsing or falling, making it extremely safe to transport cargo, etc. Moreover, all of this is achieved through a single mechanism that is simple, easy, and reliable, and is excellent in terms of cost.
The effects it brings are remarkable, such as eliminating the problems that existed in this type of conventional example.

[Brief explanation of the drawing]

1 and 2 show essential parts of an embodiment of a lift vehicle according to the present invention, with FIG. 1 being a side view thereof, and FIG. 2 being a partially cutaway plan view thereof. FIG. 3 is an enlarged plan sectional view of the main parts, showing the wire, shaft, holding plate part, balance part, etc. FIG. 4 is a side view of essential parts for explaining its operation. FIG. 5 is a side sectional view of a main part used to explain a conventional example. 6 and 7 are side sectional views of essential parts for explaining the operation of the conventional example. FIG. 6 is for explaining how the truck passes through the boom joint, and FIG. 7 is for explaining how to prevent the truck from tipping over forward. Figures 8 and 9
The figures show an example of a general lift vehicle, FIG. 8 is a side view thereof, and FIG. 9 is an explanatory diagram of its operation. 1...Dolly, 5...Wire, 6...Boom, 7
...Upper wheel, 8...Luggage, etc., 13...Vehicle body,
21...Bracket, 22...Arm, 24...
Lower wheel, 25... Holding plate section, 26... Elongated hole, 27
...Shaft, 28...Tension rod, 29
...Balance department.

Claims (1)

[Scope of Claim for Utility Model Registration] The vehicle is equipped with a boom that is mounted on the main body of the vehicle so that it can be raised and retracted, and a trolley with upper wheels that is raised and lowered by an elevating mechanism along the boom. In a lift vehicle transported by The arm is fixedly fixed to the trolley downward between the front and rear brackets, and the left and right holding plate parts are provided with elongated holes in the horizontal direction, and the holding plate parts are held by being stretched between the elongated holes of the holding plate parts. A shaft that is movable in an elongated hole, has a wire of the lifting mechanism attached to its center part, and has a balance part fixed to both ends of the shaft, and a shaft between the other ends of the front and rear arms and the balance part. , and front and rear tension rods, both ends of which are pivotally connected.