JPH0430240Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a mechanism for lifting and lowering a truck in a lift vehicle. In other words, for example, when moving, a lift vehicle for high-altitude cargo handling work is used to transport cargo between the ground and a high-altitude target using a trolley along a ladder-type boom, and in the event of a fire, firefighters, equipment, and evacuation personnel are required. Lift vehicles for high-place fire extinguishing work that similarly transport people, etc., and lifts for high-place construction work that use similarly transported workers, equipment, etc. to work on high-place targets at construction sites, etc. This relates to a mechanism for lifting and lowering a truck in a car or the like.

``Prior Art'' In such a lifting mechanism, measures against cutting the wire have conventionally been taken as follows.

First of all, the diameter of the wire has been increased. In other words, in a conventional general lifting mechanism, one sheave provided at the tip of the boom is placed between one drum of the winch device provided at the base end of the boom and the truck. Although it is equipped with a single wire stretched across the wire, the diameter of the wire has been made larger and thicker.

Second, the use of multiple wires has also recently been practiced. That is, for example, two drums were provided on the same drive shaft of a winch device, and two wires were stretched across each sheave between the drum and the truck.

``Problems that the invention attempts to solve'' By the way, the following problems have been pointed out with such conventional lifting mechanisms.

First, the method of increasing the diameter of the wire in Conventional Example 1 is as follows. That is, since the diameter of the wire is large, the corresponding sheaves, drums, etc. must also be large and have large diameters, which poses problems in terms of space, weight, and cost. Also, if the wire breaks, there is a risk of the truck falling, etc.
There were also safety issues.

On the other hand, regarding the method of using a plurality of wires as in the conventional example 2, the following will be explained. That is, even if two drums of the same diameter are used, for example, there will always be a difference in the winding amount of each wire between the two drums. Therefore, in order to absorb the difference in the winding amount, it is necessary to provide a differential device such as a differential gear, which has caused problems such as complicating the structure.

In view of the above-mentioned circumstances, the present invention has been developed to solve the above-mentioned problems of the conventional example.
A lift that ensures the same strength as two wires, easily absorbs the difference in winding amount between both drums, does not require the sheave to be large, and prevents the cart from falling when cutting the wire. The purpose of this paper is to propose a lifting mechanism for a bogie in a car.

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

This truck elevating mechanism is used in a lift vehicle that includes a boom that is mounted on the vehicle body so that it can be raised and a truck that is raised and lowered along the boom. It also has the following drum, tip sheave, bogie sheave, wire, and stopper.

The drum is located at the base end of the boom,
It consists of a pair of winch devices fixedly attached to the same drive shaft.

The tip sheave consists of a pair of sheaves disposed at the tip of the boom.

The truck sheave is provided on the truck.

One end of the wire is fixed to one of the drums, and the wire is stretched through one end sheave and one opening provided in the cart, and is stretched around the cart sheave.
Furthermore, it is stretched through the other opening provided in the truck and the other end sheave, and the other end is fixed to the other drum.

The stopper is fixedly installed on the wire between each opening and the bogie sheave, and has a diameter larger than that of each opening.
It's more like an individual thing.

"Function" Since the truck lifting mechanism according to the present invention is comprised of such means, it functions as follows.

At the destination, the boom on the vehicle body is erected, the tip of the boom is positioned opposite to a high target, and the trolley is run on the boom by a lifting mechanism, loaded with cargo, people, etc., and brought to the ground. and an elevated target.

That is, when both drums of the winch device in the elevating mechanism are rotated in forward and reverse directions, the wire is wound up or unwound onto both drums, and is then stretched between the two drums via both end sheaves to the cart sheave. As the wire is shortened or lengthened, the truck runs on the boom via the truck sheave,
be raised and lowered.

Now, although there is only one wire used in this lifting mechanism, its tension is divided into two via the trolley sheave, so the same level of strength as when using two wires is secured, and the Cutting accidents and the like will be significantly reduced.

Furthermore, although a difference in the winding amount of the wire occurs between the two drums, the cart sheave rotates in response to this, so that the difference in the winding amount can be easily and reliably absorbed.

Furthermore, even if the wire were to be cut, any stopper fixed to the wire would be secured by the remaining wire to the smaller opening in the carriage. The carriage is suspended by its own weight from the tip sheave by the wire remaining between it and one of the drums, and is prevented from falling.

"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.

6 and 7 show an example of a general lift vehicle, with FIG. 6 being a front view thereof and FIG. 7 being 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 2 mounted on the vehicle body 1 so that it can be raised, extended and contracted, and rotated. A trolley 3 is raised and lowered along this boom 2, and a bucket 4, which stores luggage, people, etc., and is pivotably supported on the trolley 3, is carried by the trolley 3 to targets on the ground and in high places, such as high-rise buildings. It is transported to and from the balcony.

To explain the boom 2 in detail, a turntable 5 is mounted on the vehicle body 1 and is rotatable by a drive device such as a hydraulically operated swing motor M1 that can rotate in forward and reverse directions.
is installed, and boom 2 is installed on this turntable 5.
is pivotably supported by a drive device such as a hydraulic raising cylinder C and a pin 6 so that it can be raised. The boom 2 is a multi-stage, extendable ladder-like structure, and the second and subsequent stages are extended and stored via an extendable device (not shown). Further, as the boom 2, there are a straight-extending type, a refracting type, and the like.

To explain the truck 3 in detail, the truck 3 is raised and lowered along the boom 2 by an elevating mechanism 7. That is, the trolley 3 is equipped with wheels 8 and has a lifting mechanism 7.
is equipped with a winch device M2 and a wire W. Then, by using a hydraulic winch device M2 for lifting and lowering that can rotate forward and backward, the wire W stretched in front and behind it is paid out and wound up.
The trolley 3 is mounted on the boom 2 at its base end 2 ₁ and tip end 2 _{2 .}
It is run between. A bucket cart 4 is pivotally supported on the cart 3 by pins 9, and the box-shaped bucket cart 4 with an open top is loaded with cargo, people, and the like.

A horizontal maintenance mechanism such as a tilt mechanism 10 is interposed between the cart 3 and the bucket cart 4, and the bucket cart 4 is always maintained in a horizontal position on the cart 3 according to the raising angle of the boom 2.

Note that in the figure, T is a wheel provided on the vehicle body 1 of the lift vehicle, and O is an outrigger that stably holds the lift vehicle on the ground A or the like.

The lift vehicle is generally configured as described above.

The elevating mechanism 7 and the like will be explained below.

FIG. 1 is a plan view thereof, and FIG. 2 is a front view thereof.

The boom 2 is of a ladder type, and includes both side frames 11 on which the wheels 8 roll and the trolley 3 travels, and a plurality of cross beams 12 installed between the side frames 11.

The cart 3 is made up of a rectangular frame body consisting of, for example, a long frame 3 ₁ and a short frame 3 ₂ .

The drums 13 of the winch device M2 form a pair, are disposed at the base end ₂₁ of the boom 2, and are fixed to the same drive shaft 14. Two identical drums 13 are installed side by side. 15 is drive shaft 1
4 is a motor serving as a driving source.

The tip sheaves 16 are arranged in pairs at the tip portion 2 ₂ of the boom 2 . Two of the same tip sheaves 16 are used, and both side frames 11 of the boom 2
They are fixed by a shaft 17 provided between them.

Next, a truck sheave 18 is provided on the truck 3. The illustrated truck sheave 18 is the long frame 3 ₁ of the truck 3.
One piece is pivoted to the lower side of a support frame 19 installed between them.

One wire W for raising the truck 3 is stretched as shown below. That is, the wire W has one end fixed to one drum 13, is stretched through one end sheave 16 and one opening 20 provided in the truck 3, is stretched over the truck sheave 18, and is further attached to the truck 3. It is stretched through the other opening 20 provided in the other end sheave 16 and the other end is fixed to the other drum 13.

The openings 20 form a pair and are bored in a bracket 21 fixed to the short frame 3 ₂ of the truck 3, for example, as shown in FIGS. 3, 4, and ₅ .
It is also possible to make a hole in the hole.

Next, both stoppers 22 are arranged between each opening 20 and the bogie sheave 18, as shown in FIGS. 4 and 5.
The wires W each have a flat end that is fixed to the wire W, has a diameter larger than each opening 20, and cannot be inserted through the opening 20.

The elevating mechanism 7 and the like are configured as described above.

Next, its operation etc. will be explained.

At the destination, the boom 2 on the vehicle body 1 is raised, extended, and rotated, and the tip of the boom 2 is positioned opposite to a high target.

A cart 3 is run on the boom 2 by an elevating mechanism 7, and loaded with cargo, people, etc., and transported between the ground and a target at a high place.

That is, the winch device M in the lifting mechanism 7
When both drums 13 of No. 2 are rotated, the wire W for raising the cart 3 is wound around both drums 13. Since the wire W, which is stretched over the bogie sheave 18 via both end sheaves 16, is shortened between both drums 13, the bogie 3 is raised above the boom 2 via the bogie sheave 18.

Now, here, although the wire W used in this lifting mechanism 7 is one, the bogie sheave 18
The tension is divided into two through the . Therefore, the same tensile strength as when using two wires is ensured, and cutting accidents and the like are significantly reduced.

Further, in both drums 13, a difference in the amount of winding occurs due to the winding of the wire W. Then, the cart sheave 18 rotates accordingly, so that the difference in the winding amount can be easily and reliably absorbed without requiring a dedicated actuating device or the like.

Furthermore, even if the wire W is cut due to some reason, one of the stoppers 22 fixed to the wire W will cut the remaining wire W.
This leads to an opening with a smaller diameter provided in the truck 3 and is locked.

The carriage 3 is suspended by its own weight from the tip sheave 16 by the wire W remaining between it and one of the drums 13, and is prevented from falling. It is assumed that this wire W has a minimum strength enough to suspend the trolley 3 by itself.

The above is the explanation of the operation, etc.

``Effect of the invention'' As explained above, the lifting mechanism of the cart in the lift vehicle according to the invention is made up of two wires using one wire.
It has the same strength as a book, and the difference in winding amount between the two drums is easily absorbed, the sheave etc. do not become large, and the cart is prevented from falling when cutting the wire. In other words, its structure is simplified, and it is superior in terms of space, weight, and cost, and there are no safety problems, and the problems that existed in conventional examples of this type have been eliminated. , there is something remarkable and great about it.

[Brief explanation of drawings]

FIGS. 1 and 2 show an embodiment of a lift mechanism for a truck in a lift vehicle according to the present invention, with FIG. 1 being a plan view thereof and FIG. 2 being a front view thereof. Third
The figure is a side view showing the bogie sheave, opening, etc. FIG. 4 is a front view showing the truck sheave, stopper, opening, etc. FIG. 5 is a perspective view showing the stopper, opening, etc. 6 and 7 show an example of a general lift vehicle, with FIG. 6 being a front view thereof and FIG. 7 being an explanatory diagram of its operation. DESCRIPTION OF SYMBOLS 1... Vehicle body, 2... Boom, 2 ₁ ... Base end, 2 ₂ ... Tip, 3... Dolly, 7... Lifting mechanism, 14... Drive shaft, 13... Drum, 16... …
Tip sheave, 18... Truck sheave, 20... Opening, 22... Stopper, M2... Winch device,
W...Wire.

Claims (1)

[Scope of claim for utility model registration] A boom mounted on the vehicle body so that it can be raised,
In a lift vehicle having a truck that is raised and lowered along the boom, the mechanism for raising and lowering the truck is disposed at the base end of the boom and is fixed to the same drive shaft of the winch device. a pair of drums arranged at the top of the boom; a pair of tip sheaves arranged at the tip of the boom; a truck sheave provided on the truck; one end fixed to the one drum; It is stretched through the sheave and one opening provided in the truck, is stretched across the truck sheave, is further stretched through the other opening provided in the truck and the other end sheave, and is attached to the other drum. A lift vehicle comprising: a wire fixed at the other end; and stoppers fixed to the wire between each of the openings and the bogie sheave and having a diameter larger than each of the openings. Lifting mechanism for the trolley.