JPS625996Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hatch cover runaway prevention device for ships.

2. Description of the Related Art A folding hatch cover for a ship is known, which is made up of a plurality of panels that are foldably connected to each other. The folding hatch cover is opened by using a deck crane or derrick to gradually lift the connecting ends of a pair of panels with cables and folding the panels into an inverted V shape. V
This is done by gradually suspending the connecting ends of a pair of panels folded in a letter shape using cables to stretch the panels horizontally, but if the cables break during opening or closing of the hatch cover. This is extremely dangerous because the pair of panels bent in an inverted V shape will run out of control in the horizontal direction, that is, in the closing direction, due to their own weight. For this reason, various runaway prevention devices using hydraulic cylinders and the like have been proposed, but all of them have complicated structures, and there are problems in mounting them on hatch covers with limited mounting space.

The object of this invention is to provide a hatch cover runaway prevention device that can prevent the panel from running out of control as described above and has a simple structure.

The runaway prevention device according to this invention is installed near the connecting end of a pair of panels that fold into an inverted V shape when the hatch cover is opened, in a ship equipped with a hatch cover consisting of a plurality of panels that are foldably connected to each other. The mutual spacing gradually decreases as the panel extends horizontally and the hatch cover is completely closed, or the panel is slightly bent and the hatch cover is slightly open, and the panel is folded and the hatch cover is completely open. One end of a first cylinder and one end of a second cylinder slidably fitted into this cylinder are each rotatably attached to the part, and liquid is put into these cylinders. Ori,
An air port is provided in the upper wall of the part of the second cylinder that always projects from the first cylinder, and
A liquid port with a relatively small cross-sectional area and high resistance is provided at the lower part of the end wall which is always inside the first cylinder of the cylinder, and a relatively large cross-sectional area is provided in the portion of the end wall above the liquid port. A flow port for liquid and air with low resistance is provided at the upper part of the inner wall of the flow port, which allows the flow of liquid and air from the first cylinder to the second cylinder, but hangs down due to its own weight and closes the flow port. The upper end of the lid is rotatably attached to prevent liquid and air from flowing from the second cylinder to the first cylinder by sealing the cylinder.

If the cable breaks while a pair of panels is bent considerably while opening or closing the hatch cover, or if the cable is suddenly let out by mistake in the same situation, the panels may be damaged by their own weight. Then, the second cylinder suddenly tries to move forward from the first cylinder because the distance between the attachment parts of the two cylinders to the panel suddenly increases. When the second cylinder advances, the volume of the first cylinder increases, and the flow of liquid and air from the second cylinder to the first cylinder is blocked by the lid, leading to a liquid opening from the second cylinder with high resistance. Since the liquid only gradually flows into the first cylinder through the first cylinder, the pressure in the first cylinder becomes negative.
When liquid gradually flows into the first cylinder from the second cylinder, the volume of the non-liquid part of the second cylinder increases, but because outside air flows into the second cylinder through the air port, The pressure within the second cylinder quickly approaches atmospheric pressure, and this pressure and the pressure of the liquid keep the lid sealed over the flow opening. Therefore, as the liquid flows into the first cylinder from the liquid port having a large resistance, the panel gradually falls down, and runaway movement of the panel is prevented. On the other hand, when the hatch cover is opened, the distance between the mounting portions of the two cylinders gradually decreases, so that the second cylinder gradually retracts into the first cylinder. Therefore, the volume of the first cylinder gradually decreases, but as the second cylinder moves in and out, the liquid and air in the first cylinder flow into the second cylinder from the flow port with almost no resistance. . As a result, the volume of the portion of the second cylinder other than the liquid decreases, but the air within the second cylinder flows out from the air port. Therefore, no extra load is applied to the lifting cable, and the connecting end of the panel can be lifted in the same way as in the case without the runaway prevention device.

According to this invention, as described above, it is possible to reliably prevent the panels constituting the hatch cover from moving out of control. Furthermore, the structure is extremely simple, as it is just two cylinders with several openings and a lid attached to a panel.

Embodiments of this invention will be described below with reference to the drawings.

Figure 1 shows a part of the hatch coaming 1 of a ship.
A set of hatch covers 2 is provided. Each hatch cover 2 has a first panel 3 whose one end is rotatably attached to the end of the hatch coaming 1, and is foldably connected to the rotatable end of the first panel 3 by a hinge 4. On both sides of the other end of the second panel 5, guide rollers 7 that roll on guide rails 6 on both sides of the hatch combing 1 are attached. When the hatch cover 2 is completely closed, the pair of panels 3 and 5 extend horizontally, as shown by the solid line in FIG. As shown, a pair of panels 3, 5 are folded into an inverted V shape. Since the hatch cover 2 itself is the same as the conventional one, other detailed explanations will be omitted.

Runaway prevention devices 8 are provided on both sides of the first and second panels 3, 5 near their connecting ends, the details of which are shown in FIG. That is, one end of the first cylinder 9 is connected to the second panel 5.
One end of the second cylinder 11, which is slidably fitted into the cylinder 9, is rotatably attached to the outer surface of the first panel 3 by a pin 10. It is attached so that it can rotate freely. Pins 10, 1 of two cylinders 9, 11
The mutual spacing between the pins 10 and 1 changes from the state in which the panels 3 and 5 extend horizontally as shown in FIG.
It becomes the largest when 2 and the hinge 4 are located on the same plane, and gradually decreases from this state until the panels 3 and 5 are folded into an inverted V shape as shown in Figure D. Become. The two cylinders 9 and 11 have a second cylinder as shown in FIG.
Oil (liquid) 13 is contained in an amount that almost fills the inside of the first cylinder 9 when the first cylinder 11 is retracted the most into the first cylinder 9. An air chamber 14 is provided on the wall of the portion of the second cylinder 11 that always protrudes from the first cylinder 9, and this wall has an air port 15 that communicates the second cylinder 11 and the air chamber 14. is provided. An air port 16 is provided in the upper wall of the air chamber 14 at a position laterally shifted from directly above the air port 15. In addition, a small-diameter liquid port 17 with large resistance is provided at the lower part of the end wall of the second cylinder 11 which is always inside the first cylinder 9.
is provided. Furthermore, the liquid port 1 of this end wall
A large-diameter communication port 18 for oil 13 and air with low resistance is provided above 7, and this communication port 18
The upper end of the lid 19 is rotatably attached to the upper part of the inner wall of the lid 19. This lid 19 allows oil 13 and air to flow from the first cylinder 9 to the second cylinder 11, but hangs down under its own weight and seals the flow port 18, thereby allowing the flow of oil 13 and air from the second cylinder 11 to the first cylinder. The flow of oil 13 and air to 9 is prevented. When the second cylinder 11 protrudes from the first cylinder 9, oil 13 is present at the bottom of these cylinders 9 and 11,
There is air at the top.

When the hatch cover 2 is not opened or closed,
For example, when the hatch cover 2 is closed as shown in FIG. 2A, the air vent 16 at the top of the air chamber 14 is
A stopper 20 is attached to the end. The plug 20 is removed from the air port 16 when the hatch cover 2 is opened or closed.

The hatch cover 2 is opened, as in the conventional case, by lifting up the connecting ends of the pair of panels 3 and 5 with the cable 21 and folding them into an inverted V shape. As the panels 3 and 5 are folded into an inverted V shape as shown in FIG.
12 becomes gradually smaller, so that the second cylinder 11 gradually retracts into the first cylinder 9. Therefore, the volume of the first cylinder 9 gradually decreases, but as the second cylinder 11 moves in and out, the oil 13 and air in the first cylinder 9 are transferred from the communication port 18 to the second cylinder 11. flows in with little resistance. As a result, the volume of the second cylinder 11 other than the oil 13 is reduced, but the air inside the second cylinder 11 flows out through the air port 15, the air chamber 14, and the air port 16. Therefore, no extra load is applied to the lifting cable 21, and the connecting ends of the panels 3 and 5 can be lifted in the same way as in the case without the runaway prevention device 8.

During the opening or closing operation of the hatch cover 2, the pair of panels 3 and 5 are bent considerably as shown in FIG.
If cable 21 breaks or accidentally breaks cable 21 in the same condition.
When the panels 3 and 5 are suddenly let out, the panels 3 and 5 tend to fall down horizontally due to their own weight, as shown in E of the figure, but the runaway prevention device 8 This prevents the panels 3 and 5 from running out of control. In other words, when the panels 3 and 5 suddenly try to fall down, the distance between the pins 10 and 12 suddenly increases, and the second cylinder 11 suddenly tries to advance from the first cylinder 9. do. When the second cylinder 11 advances, the volume of the first cylinder 9 increases, and the second cylinder 11
The flow of oil 13 and air from the first cylinder 9 to the second cylinder 11 is blocked by the lid 19.
Since the oil 13 only gradually flows into the first cylinder 9 through the liquid port 17 having a large resistance, the pressure inside the first cylinder 9 becomes negative pressure. When the oil 13 gradually flows from the second cylinder 11 to the first cylinder 9, the oil 13 in the second cylinder 11
Although the volume of the other parts increases, the pressure inside the second cylinder 11 immediately decreases because external air flows into the second cylinder 11 through the air port 16, air chamber 14, and air port 15. close to atmospheric pressure,
Due to this pressure and the pressure of the oil 13, the lid 19
8 is maintained in a sealed state. Therefore, as the liquid flows into the first cylinder 9 from the liquid port 17 having a large resistance, the panels 3 and 5 gradually fall down, and the panels 3 and 5 are prevented from running out of control.

When closing the hatch cover 2, the connecting ends of the panels 3 and 5 are gradually pulled down by the rope 21 at a speed at which the panels 3 and 5 gradually fall down due to the action of the runaway prevention device 8 as described above, or at a lower speed. Just hang it up.

In the above embodiment, since the air chamber 14 is provided above the second cylinder 11, even if the ship is shaken with the second cylinder 11 retracted into the first cylinder 9, Only a portion of the oil 13 in the cylinders 9, 11 enters the air chamber 14, and there is no risk of the oil 13 leaking outside. However, the air chamber 14 is not absolutely necessary. Also,
Instead of the air chamber 14, the lower end of a tube whose upper end is bent into an inverted U shape may be connected to the air port 15 of the second cylinder 11, for example. The two cylinders 9, 11 move from the state where the panels 3, 5 extend horizontally and the hatch cover 2 is completely closed to the panels 3, 5.
In some cases, the hatch cover 2 is folded into an inverted V shape and the hatch cover 2 is attached at a portion where the distance between them becomes narrower until the hatch cover 2 reaches a completely open state. In the above embodiment, two sets of runaway prevention devices 8 are provided on both sides of the connecting end of the pair of panels 3 and 5.
Only one set of runaway prevention devices may be provided at appropriate positions at the connecting ends of the panels, or three or more sets may be provided. Further, the hatch cover may be made up of four or more panels. In this case,
One or more sets of runaway prevention devices are provided at the connecting ends of each pair of panels that are folded into an inverted V shape when the hatch cover is opened.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Figure 1 is a side view of the hatch cover, and Figure 2 is an enlarged cross-sectional view of the runaway prevention device when the hatch cover is in the closed position, open position, and intermediate positions. It is a diagram. 2...hatch cover, 3, 5...panel, 8...
...runaway prevention device, 9...first cylinder, 11...
...Second cylinder, 13...Oil (liquid), 15...
...Air port, 17...Liquid port, 18...Distribution port, 1
9... Lid.

Claims (1)

[Scope of utility model registration request] In a ship equipped with a hatch cover consisting of a plurality of panels 3 and 5 that are foldably connected to each other, the panel 3 is located near the connecting end of a pair of panels 3 and 5 that are folded into an inverted V shape when the hatch cover is opened. , 5 extend horizontally and the hatch cover is completely closed, or from a state where the panels 3 and 5 are slightly bent and the hatch cover is slightly opened, to a state where the panels 3 and 5 are folded and the hatch cover is completely opened. One end of the first cylinder 9 and one end of the second cylinder 11, which is slidably fitted into the cylinder 9, are each rotatably attached to a portion where the mutual distance gradually decreases. , liquid 13 in these cylinders 9, 11
An air port 15 is provided in the upper wall of the part of the second cylinder 11 that always protrudes from the first cylinder 9, and the second cylinder 11 is always inside the first cylinder 9. A liquid port 17 with a relatively small cross-sectional area and high resistance is provided at the bottom of the end wall, and a liquid 13 with a relatively large cross-sectional area and low resistance and air are provided above the liquid port 17 in the end wall. A flow port 18 is provided, and a first cylinder 9 is provided at the upper part of the inner wall of the flow port 18.
Although the liquid 13 and air are allowed to flow from the second cylinder 11 to the second cylinder 11, the liquid 13 and air are not allowed to flow from the second cylinder 11 to the first cylinder 9 by hanging down under its own weight and sealing the flow port 18. A hatch cover runaway prevention device for a ship in which the upper end of a blocking lid 19 is rotatably attached.