JPS6348756Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an elevating device for a workbench in which a pantograph is driven by a hydraulic device to move the workbench up and down.

Generally, in civil engineering works such as shipbuilding, repair, construction of buildings, tunnels, roads, etc., when the work position is considerably higher than the ground surface, a scaffold is installed at this work position, and workers walk on this scaffold or operate working machines. I'm letting you do it.

In this case, the height of the work position varies, and when displacing the position of the scaffold, a pantograph is installed on the work platform, and this pantograph is driven by a hydraulic cylinder to extend and contract the pantograph up and down according to the height of the work position. Recently, a workbench lifting device called a lifter has been developed to appropriately adjust the height of the workbench. In addition, conventional roll-on and roll-off ships are equipped with decks and work platforms for storing automobiles and other export goods, and these are moved up and down by a lifting device from the bottom of the ship when loading and unloading cargo. This is common, and in this case, a lifter using a hydraulic cylinder is used in addition to the wire hoisting method for raising and lowering.

However, in this conventional elevating device, since the hydraulic cylinder is installed at an angle, the compression stroke of the pantograph is limited, and the pantograph cannot be folded compactly. However, even though work such as welding inside the hull block or work inside tunnels requires moving work machines and scaffolding one after another through small gaps, the work efficiency is poor, but with the conventional lifter mentioned above, it is compact As a result, the workbench, pantograph, etc. collide with the inner wall, making it impossible to move through this small gap. In addition, in order to fold the pantograph compactly, the hydraulic cylinder attached to it needs to be horizontal or at a small angle of inclination, but if the hydraulic cylinder is horizontal or at a small angle of inclination, the force will actually push up the workbench. The vertical force is not sufficient, but rather the force that presses the pantograph laterally,
The horizontal force is large and may cause damage to the pantograph. In addition, when a car deck or the like is installed in the hold of a ship and is raised and lowered using hydraulic cylinders, etc., the space inside the hold is very narrow, and a considerable height is required to install the lifting device within this narrow space. Therefore, there is a particular demand for reducing the height of this lifting device by even a few millimeters.

However, as a lifting device that directly pushes up the deck or workbench, one or more cylinders are installed perpendicular to or close to perpendicular to the workbench, and a pantograph is installed in the center, and the lifting force is borne by the cylinder. Think of things that carry unbalanced loads, horizontal forces, etc. However, with this lifting device, the workbench is directly pushed up, so the lifting operation is smooth, but in order to ensure the sufficient height of the workbench, a long cylinder is required for the height, and a relatively long cylinder is used. Not only is this uneconomical, but it also has the disadvantage that it does not become as compact as desired when compressed.

Therefore, the purpose of the present invention is to install one or more short auxiliary cylinders in the thin wall part of the lower part of the workbench, and to install a horizontal or inclined main hydraulic cylinder on the pantograph, and use the auxiliary cylinders when starting by pushing up. At this point, the main hydraulic cylinder takes over the extension operation to further raise the pantograph.
The auxiliary cylinder allows the workbench to be easily raised with a relatively small pushing force from the auxiliary cylinder during startup, and when compressed, the auxiliary cylinder is housed within a thin section, allowing the workbench to be folded into a completely compact size. The object of the present invention is to provide a work platform lifting device using two methods: a main hydraulic cylinder and a main hydraulic cylinder.

An embodiment of the present invention will be described below with reference to the drawings.

The combination of two methods using an auxiliary cylinder and a main hydraulic cylinder according to the present invention is to install a pantograph at the bottom of the workbench, and to install a relatively short telescopic or ordinary hydraulic cylinder in the thin section at the end of the workbench. This hydraulic cylinder is used as an auxiliary cylinder, and the pantograph is equipped with a horizontal main hydraulic cylinder or an inclined main hydraulic cylinder, and when starting, the auxiliary cylinder is driven to a certain height. The workbench is raised, and then one of the main hydraulic cylinders is driven to raise the pantograph.

Similarly, another way of combining the lifting device is to erect an auxiliary cylinder on the thin wall at the lower center of the workbench.
A pantograph is equipped with a horizontal or inclined main hydraulic cylinder. Still another type of lifting device is one in which an auxiliary cylinder is vertically attached to a thin section in the approximate center of the workbench, and a horizontal or inclined main hydraulic cylinder is disposed on the pantograph. These auxiliary cylinders are relatively short and are activated only when the workbench starts to rise, so they are stored in the thin wall part during compression, allowing the workbench to be made more compact.Furthermore, the lifting force of the auxiliary cylinders acts directly on the workbench at the time of startup. Therefore, a large pushing up force is not required, and since no pushing up force acts on the pantograph, there is no chance of it being damaged. Furthermore, by starting the main hydraulic cylinder with the auxiliary cylinder, the main hydraulic cylinder can be set horizontally or at a small angle of inclination with respect to the pantograph, so that the workbench can be made compact when compressed. If the auxiliary hydraulic cylinder is stored in a thin walled part, the main hydraulic cylinder can be connected between the base end support of the pantograph and the workbench, between the support stand and the pantograph, between the pantograph and the workbench, or between two pantographs. It can also be used.

It goes without saying that the cylinder may be hydraulic or pneumatic, and may be single-acting or double-acting.

Next, an embodiment in which the main hydraulic cylinder is installed obliquely in a nearly horizontal state will be described with reference to the drawings.

The base end of the main hydraulic cylinder 1 is pivotally connected to a bracket 3 of a support frame 2, and the other end is pivotally connected to one of pantographs 4 and 5 via a bracket 6. The drive unit A, which consists of a main cylinder 1 and pantographs 4 and 5, has the pantographs 4 and 5 installed at one location or below the four corners of the work platform 7, and the lower end of each pantograph 4 and 5 is attached to a lower end installed in a ship's hold, etc. It is connected to a support frame 2. In this case, the two legs 4a and 5a of the pantograph
The lower end of one leg 5a is fixed to the support frame 2 by a rotatable shaft support, pivot, etc., and the other leg 4a is bracketed to the piston rod of the hydraulic cylinder 1 attached to the support frame 2. 6, and the leg 4a is pushed or pulled laterally according to the expansion and contraction of the cylinder 1, and the top of one leg 5a is slidably supported on the workbench 7, and the other leg 4a is is pivotally supported on a workbench 7, and the legs 4a and 5a are rotatably connected by shafts 8 and 9 at the intersection point, so that the pantographs 4 and 5 are vertically expanded or compressed in accordance with the expansion and contraction of the main cylinder 1. It's getting old.

Further, a telescope-type auxiliary hydraulic cylinder 16d is housed and erected in the thin-walled portions 10 on both sides of the support frame 2, and the workbench 7 is connected via this auxiliary cylinder 16d.
When raising the hydraulic cylinder 1, the force of the hydraulic cylinder 1 alone is not enough to raise it quickly, so it is used as an auxiliary force. That is, when starting to push up the workbench 7, the auxiliary cylinder 16d is used to raise the workbench 7 to an arbitrary height, effectively generating a push-up force for the main hydraulic cylinder 1, and at this point, the main hydraulic cylinder 1
The pantographs 4, 5 and the workbench 7 are raised to a predetermined height by taking over the extension operation.

A hole 12 having an inner diameter slightly larger than the outer diameter of the auxiliary hydraulic cylinder 16d is vertically bored in the workbench 7, and a support portion 14 thinner than the workbench 7 is formed at the top of the hole 12. The lower part of the auxiliary hydraulic cylinder 16d is made to protrude downward from the support frame 2 so that the auxiliary hydraulic cylinder 16d is located as close to the bottom of the ship as possible, so that when the workbench is fully compressed, the top of the auxiliary hydraulic cylinder 16d touches the workbench 7. It is located below the thin support portion 14 on the side. For this reason, when the auxiliary hydraulic cylinder 16d is extended, its top part pushes up the workbench 7 to a certain height via its thin support part 14, and when the workbench 7 is fully compressed, the auxiliary hydraulic cylinder 16d pushes up the hole 12, 13
Since the workbench 7 is housed inside, the workbench 7 can be folded compactly regardless of the height of the auxiliary hydraulic cylinder 16d.

A thin receiving part 2 with an L-shaped cross section is provided at the end of the support frame 2.
3 protrudes downward, and this is the reinforcing member 24
A hole 12 and a thin support part 14 are formed in the workbench 7 facing the receiving part 23, and the receiving part 23 and the thin support part 14 form a thin part 10. . In this case, a support member similar to the receiving portion 23 may be provided on the workbench 7 side.

In the above-mentioned lifting device, at the time of start-up, the auxiliary hydraulic cylinder 16d is used to push up the workbench 7 to a desired height, and when it reaches a certain position, the lifting force of the main hydraulic cylinder 1 continues to act on the pantographs 4 and 5 to lift it up. Stand up to the height indicated by the chain line. Further, at the time of maximum compression, the pantographs 4 and 5 are folded into a compact size, and at this time the main hydraulic cylinder 1 is also tilted almost to a horizontal position, so that the thickness from the ground surface or the bottom of the ship to the horizontal surface of the work platform 7 becomes extremely small.

The present invention provides a thin-walled receiving portion facing downward at the end of the support frame opposite to the thin-walled supporting portion on the workbench side.
It is characterized in that an auxiliary cylinder is erected on this receiving part. With this, when the workbench is compressed, it comes into contact with the support frame, or when it is compactly lowered to a state close to contact, the auxiliary cylinder can be stored in a thin section so as not to interfere with the height of the workbench. In this case, the workbench can be compressed into a compact size in places such as the bottom of a ship, where the height and space are extremely small.

[Brief explanation of drawings]

The accompanying drawing is a schematic longitudinal sectional side view of a lifting device according to an embodiment of the present invention. 1... Main hydraulic cylinder, 2... Support frame, 4, 5... Pantograph, 7... Workbench, 1
4... Thin support part, 16d... Auxiliary hydraulic cylinder, 23... Receiving part.

Claims (1)

[Scope of utility model registration request] A pantograph is arranged telescopically between the workbench and the support frame, a short auxiliary cylinder is erected at the bottom of the workbench, and a horizontal or inclined main hydraulic cylinder is installed on the pantograph, and the auxiliary cylinder is driven when starting by pushing up. In the lifting device that can raise the workbench to a certain height and then take over the extension operation to the main hydraulic cylinder, a vertical hole is bored in the workbench side, a thin support part is provided at the top of this hole,
A lifting device for a workbench in which a thin wall receiving portion is provided at the end of the support frame facing downward, the receiving portions are opposed to the thin wall supporting portion, and an auxiliary cylinder is erected on the receiving portion.