JPS63212700A - Lift car - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a lift vehicle configured to raise and lower a truck by a lifting mechanism along a boom having at least a lifting mechanism. In other words, for example, when moving, a lift vehicle for high-altitude cargo handling work transports cargo between the ground and a high-altitude target, and at a work site, workers, equipment, etc. are transported to a high-altitude target. Related to lift vehicles for working at heights.

``Prior Art'' and ``Problems to be Solved by the Invention'' In such a lift vehicle, the mechanism for raising and lowering the cart has conventionally been generally as follows.

That is, one end of the winch is fixed to the drum of the winch, which is equipped with a single drum configured to be rotatable in forward and reverse directions, and
The other end of the wrapped wire is strung along the boom via a sheave installed at the tip of the boom, the other end is connected to the truck, and the wire is stretched between the winch and the truck by the drive of the winch. A single wire was used to raise and lower the cart.

Therefore, no matter how high the safety factor of the wire is, if the wire is cut for some reason, there is a risk of a major accident.

Therefore, in such a lift vehicle, as a safety measure when cutting the wire of the lifting mechanism, for example, in a lift vehicle having a ladder type boom, an engaging member that is always connected to the wire is used. The tension of the wire keeps it stored in the trolley, and when the wire is cut, the engaged state by the engaging member etc. is released, and it is protruded by the biasing force of the spring etc. and pressed against the side frame of the boom. The brake member is equipped with a brake member configured as such, or it is normally in a retracted position along the bogie, and when the wire is cut, it is rotated in the direction of the operating position by the biasing force of the spring and protrudes below the bogie, and is attached to the bridge girder of the boom. A lift vehicle is provided that includes a safety device having a locking member configured to lock.

However, in the former method, the brake member is pressed against the side wall of the boom, and the bogie is braked and fixed to the boom by the frictional force, so the fixation of the bogie may become uncertain. If the boom side frame was coated with grease or the like, there was a risk that the bogie would fall from the boom due to uncertain fixation.

In addition, the latter method fixes the trolley to the boom by locking the locking member to the crossbeam of the boom, so it is possible to secure the trolley to the boom more reliably than the former, but for example, When cargo or heavy cargo is loaded onto packets installed on a trolley, the sudden stop of the trolley may cause the cargo to collapse, resulting in damage to the cargo or damage to the crossbeam of the boom. There were concerns that this would occur.

In addition, conventional safety devices have complicated configurations, and furthermore, when the tension of the wire temporarily decreases for some reason and a so-called momentary slack state occurs, that is, the wire is cut. It has also been pointed out that the safety device was activated even when the boom was not installed, resulting in the bogie being fixed to the boom, resulting in inaccurate operation.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to temporarily raise and lower a cart by a lifting mechanism equipped with a plurality of wires having a predetermined strength. Even if the wire at the boom is cut, the trolley can be prevented from falling from the boom without the need for special safety devices, and the trolley can continue to be raised and lowered reliably. The objective is to propose a lift vehicle equipped with a lifting mechanism.

[Means for Solving the Problems] The present invention has been made to achieve the above object, and the technical solution thereof is as follows.

This lift vehicle includes a boom mounted on a chassis and equipped with at least a mechanism capable of raising and lowering, and a cart that is raised and lowered along the boom by a lifting mechanism.

The elevating mechanism includes a winch in which a plurality of drums are mounted on a drive shaft which is arranged to be rotatable in forward and reverse directions by an appropriate drive source, and one end of each drum is fixed to each drum of the winch. It has a plurality of wound wires having a predetermined strength and a plurality of sheaves arranged in parallel at the tip of the boom, and the middle part of each wire is connected along the boom through each sheave. The other end of each wire is connected to a truck, and the truck is moved up and down along the boom by driving a winch.

"Function" Since the lift vehicle according to the present invention includes the above-mentioned means, it functions as follows. In other words, at the destination, the boom is erected and the tip of the boom is positioned opposite to the high target.This lift vehicle transports cargo between the ground and the high target along the boom. As the lift mechanism is driven by a winch, the boom is raised and lowered by multiple wires with a predetermined strength that are stretched in parallel along the boom, so even if some of the wires are cut during the lift operation, However, since the truck is supported by the remaining wires and continues to move up and down, the truck will not fall from the boom.

In addition, since there is no need to install a safety device between the trolley and the pool to prevent the trolley from falling, the tension of the wire may temporarily drop for some reason during the lifting and lowering operation, resulting in a so-called instantaneous slack state. Even in such a case, the safety device is activated and the truck is fixed to the boom, so that incorrect operation such as interruption of the lifting and lowering operation does not occur.

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

First, we will give an overview of lift vehicles.

FIG. 3 is a front view showing an example of a general lift vehicle.

In addition to the self-propelled type shown in the figure, there are also towed types that do not have driving power, and both have a boom 2 equipped with at least a mechanism that can raise and lower a vehicle on a chassis 1. It has a cart 4 that is raised and lowered by a lift mechanism 3, and a packet 5 that is pivotally supported on the cart 4 and is used to load luggage and the like. Baggage and the like are transported between the ground and a target at a high place by such a packet 5.

To explain the boom 2 in detail, the boom 2 in the embodiment
The boom 2 is configured to be able to raise and lower, extend and contract, and turn. ), it is pivotably supported on a turntable 6 which is configured to be able to rotate, by a levying device 7 such as a hydraulic undulating cylinder and a mounting shaft 8 so as to be erectable. The boom 2 is a multi-stage, extendable, ladder-like structure, and the second and subsequent stages are extended and retracted using a telescoping device (not shown). The boom 2 may be a pre-filled multi-stage boom with a square cross section or a substantially flat cross section, a bending type boom, and various other types and shapes.

To explain in detail about the truck 4, etc., this truck 4, etc. is the boom 2.
It is raised and lowered by a lifting mechanism 3, which will be described later. That is, the truck 4 is equipped with wheels 9, 9, . . . and runs on the boom 2 with its base end 2a and tip end 2bll.

On this trolley 4, a box-shaped packet 5 with an open top surface for loading luggage, etc. is pivotally supported by a mounting pin 11. A control mechanism 12 is interposed so that the packet 5 is always kept in a horizontal position on the cart 4 according to the angle of elevation of the boom 2.

The lift vehicle is constructed in this way.

Next, the elevating mechanism 3 will be explained based on FIGS. 1 and 2.

FIG. 1 is a front view schematically showing the elevating mechanism of a lift vehicle according to the present invention, and FIG. 2 is a plan view schematically showing the elevating mechanism.

The boom 2 has side frames 13.13 on which wheels 9.9... roll and the trolley 4 travels, and cross beams 14.14 installed between the side frames 13.13. It consists of a ladder type structure.

The trolley 4 is made of, for example, a rectangular frame 4a,
A pair of wheels 9.9 are provided at both front and rear ends of the frame body 4a, respectively, so as to protrude laterally via an axle 9a in a positional relationship corresponding to the side frames 13.13.

The lifting mechanism 3 includes a winch 15 and two wires 16.
．． 16 and two sheaves 17 and 17 arranged in parallel at the tip of the boom 2, and the winch 15 is attached to the lower part of the base end 2a of the boom 2 via a mounting frame (not shown). A plurality of drums 20 (two in the embodiment) are mounted on a drive shaft 19 connected to a drive source 18 such as a hydraulic motor or an electric motor capable of forward and reverse rotation via a reducer (not shown) or the like. .20 is attached, so that it can be rotated in forward and reverse directions by the drive of the 7 drive source 18.

The wires 16, 16 each have a strength sufficient to withstand raising and lowering the cart 4 loaded with packets 5, etc., and have one end fixed to each drum 20, 20, respectively. The middle part of each of these wires 16.16 is wound along the boom 2 via two sheaves 17.17 rotatably arranged in parallel at a predetermined interval at the tip of the boom 2. and each wire 1
The other ends of 6 and 16 are respectively attached to the front frame 4a of the truck via appropriate attachment members (not shown), and are kept in a tensioned state at all times.

Note that 21, 21... are outriggers for stably holding the lift vehicle on the ground during work.

In the above-mentioned embodiment, a configuration was described in which two drums 20, 20 were separately mounted on the drive shaft 19 of the winch 15, but the configuration of the drums is not limited to the embodiment, and for example, It is also possible to mount a drum having a structure in which two drums are integrally formed so as to be positioned in conjunction with each other.

In short, as the drive shaft 19 rotates, the two wires 16.
16 can be wound up and unwound simultaneously and smoothly.

The above is the explanation of the configuration.

Next, the operation etc. will be explained.

For example, when transporting cargo from the ground to a high-altitude target,
First, at the destination, the lift vehicle is held horizontally by the outriggers 21, 21, and then the hoisting device 7,
By driving a telescoping device (not shown) and a turntable 6, the boom 2 on the vehicle platform is raised, extended, and rotated, and the tip of the boom 2 is positioned opposite to a high target. Next, after loading cargo etc. onto the packet 5 which is located at the base end 2a of the boom 2 and maintained in a horizontal state, the winch 15 of the lifting mechanism 3 is driven so that the wire 16, 16 is wound up. Accordingly, the trolley 14 includes the trolley 4, the packet 5,
The two wires 16, 16 are tensioned by the weight of the cargo, etc., and run toward the tip end 2b of the boom 2, and the cargo is transported toward a high target.

Even if one of the wires 16 is cut off for some reason at all times like this, the trolley 4 loaded with luggage etc. can withstand the lifting and lowering of the platform 114 loaded with luggage etc. Since the cart 4 continues to rise while being pulled by another strong wire, the cart 4 will not fall.

"Effects of the Invention" According to the lift vehicle according to the present invention, the truck is raised and lowered along the boom by a lifting mechanism equipped with a plurality of wires having a predetermined strength that are simultaneously wound and unwound. Even if some of the wires are cut, the trolley will continue to move up and down without falling, making work extremely safe. In addition, its structure is simple, its operation is reliable, and its effects are remarkable and significant, such as eliminating the problems that conventionally existed in all types of motor vehicles. .

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view schematically showing the elevating mechanism of a lift vehicle according to the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a diagram of a general lift vehicle. It is a front view showing an example. 1... Chassis 2... Boom 3... Lifting mechanism 4... Dolly 7... Lifting device 8... Mounting shaft 15... Winch 16... Wire 17... Sheave 18... ... Drive source 19 ... Drive shaft 20 ... Drum ... Lift vehicle patent applicant Showa Aircraft Industry Co., Ltd. agent
Person Masashi Kamo Shita Figure 2 Figure 31! ! N11

Claims (1)

[Claims] In a lift truck comprising a boom equipped with at least a mechanism capable of raising and lowering, which is mounted on a chassis, and a truck that is raised and lowered by a lifting mechanism along the boom, the lifting mechanism includes:
A winch has a plurality of drums mounted on a drive shaft which is arranged to be rotatable in forward and reverse directions by an appropriate drive source, and one drum is fixed to each drum of the winch, and a predetermined drum is wound around the winch. a wire having a strength of . A lift vehicle, wherein the other end of each wire is connected to the truck, and the truck is raised and lowered by driving the winch.