JPS625997Y2 - - 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 an air cylinder and one end of a rod fixed to a piston slidably fitted into the cylinder and protruding from the other end of the cylinder are respectively rotatably attached to the part where the air cylinder is formed. An air port with a relatively large cross-sectional area and low resistance is provided in the wall of the air chamber on the rod side of the cylinder, and an air port with a relatively small cross-sectional area and large resistance is provided in the wall of the air chamber on the head side of the cylinder. At the same time,
An air opening with a relatively large cross-sectional area and low resistance is provided on the upper wall of this air chamber, and the wall outside of this air opening allows air to flow out from the air chamber to the outside, but seals the air opening with its own weight. A lid is rotatably attached thereto to prevent air from flowing into the air chamber from the outside.

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 rod tends to suddenly fall down in the horizontal direction, and the mutual distance between the cylinder and rod attachment portion to the panel suddenly increases, causing the rod to suddenly try to advance from the cylinder. When the rod advances, the volume of the air chamber on the rod side decreases, but as the air inside the chamber flows out through the air port with low resistance, the pressure inside the chamber quickly approaches atmospheric pressure.
In addition, when the rod advances, the volume of the air chamber on the head side increases, and the lid blocks air from flowing into the room from the air ports with low resistance, allowing air to gradually flow into the room from the air ports with high resistance. As a result, the pressure in the room becomes negative. Therefore,
As air flows into the air chamber on the head side from the air port with high resistance, the panel gradually falls down, thereby preventing the panel from moving out of control. On the other hand, when the hatch cover is opened, the distance between the mounting portions of the cylinder and the rod gradually decreases, so that the rod gradually retreats into the cylinder. For this reason, the volume of the air chamber on the rod side of the cylinder gradually increases, and the volume of the air chamber on the head side gradually decreases, but as the rod moves in and out, outside air flows from the air port to the rod side. Air flows into the air chamber on the head side with almost no resistance, and air in the air chamber on the head side flows out of the air chamber with almost no resistance to the outside from the air chamber with the lid. 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 simply consists of an air cylinder with several air ports and a lid, and a piston rod 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, one end of which is rotatably attached to the end of the hatch coaming 1, and a hinge 4 that connects the first panel 3 to the rotatable end of the first panel 3 so as to be foldable. 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, these 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 air cylinder 9 is rotatably attached to the outer surface of the second panel 5 by a pin 10. A piston 11 is slidably fitted into the cylinder 9, and one end of a rod 12 fixed to the piston 11 and protruding from the other end of the cylinder 9 is attached to a pin 13 on the outer surface of the first panel 3. It is rotatably mounted by. cylinder 9
The mutual spacing between the pins 10 and 13 of the rod 12 is greatest when the panels 3 and 5 are slightly bent from the horizontally extended state and the pins 10 and 13 and the hinge 4 are located on the same plane. The size gradually decreases from this state until the panels 3 and 5 are folded into an inverted V shape. A large-diameter air port 15 with low resistance is provided in the wall of the air chamber 14 on the rod side of the cylinder 9, and a small-diameter air port 17 with high resistance is provided in the wall of the air chamber 16 on the head side.
Further, a large-diameter air port 18 with low resistance is provided on the upper wall of the air chamber 16 on the head side, and one end portion of a lid 19 is rotatably attached to the wall outside the air port 18. This lid 19 allows air to flow out from the air chamber 16 to the outside, but prevents air from flowing into the air chamber 16 from the outside by sealing the air port 18 with its own weight.

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 rope 20 and folding them into an inverted V shape. As the panels 3 and 5 are folded into an inverted V shape, the distance between the pins 10 and 13 of the cylinder 9 and rod 12 gradually decreases, so that the rod 12 gradually retreats into the cylinder 9. . Therefore, the volume of the air chamber 14 on the rod side of the cylinder 9 gradually increases, and the volume of the air chamber 16 on the head side gradually decreases.
As the rod 12 moves in and out, external air flows from the large-diameter air port 15 into the air chamber 14 on the rod side with almost no resistance, and the air chamber 14 on the head side
6 flows out from the large-diameter air chamber 18 with the lid 19 to the outside with almost no resistance. Therefore, no extra load is applied to the lifting cable 20, 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.

If the cable 20 breaks while the pair of panels 3 and 5 are bent considerably during the opening or closing operation of the hatch cover 2, or if the cable 20 is suddenly let out by mistake in the same condition, Although the panels 3 and 5 tend to suddenly fall down in the horizontal direction due to their own weight, the runaway prevention device 8 prevents the panels 3 and 5 from falling out of control. In other words, if panels 3 and 5 suddenly try to fall down like this,
Since the mutual distance between the pins 10 and 13 is rapidly increasing, the rod 12 is rapidly attempting to advance from the cylinder 9. When the rod 12 advances, the volume of the air chamber 14 on the rod side decreases;
Since the air inside flows out from the large-diameter air port 15 with low resistance, the pressure inside the chamber 14 quickly becomes close to atmospheric pressure. Also, when Rod 12 advances,
The volume of the air chamber 16 on the head side increases, and the lid 19 prevents air from flowing into the chamber 16 from the large-diameter air port 18 with low resistance, so that air gradually enters the chamber 16 from the small-diameter air port 17 with high resistance. Since only air flows into the chamber 16, the pressure inside the chamber 16 becomes negative.
Therefore, as air flows into the air chamber 16 on the head side from the small-diameter air port 17, the panels 3, 5 gradually fall down, and the panels 3, 5 are prevented from moving 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 20 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.

The air cylinder 9 and the rod 12 move from the state in which the panels 3 and 5 extend horizontally and the hatch cover 2 is completely closed to the state in which the panels 3 and 5 are folded in an inverted V shape and the hatch cover 2 is completely opened. They are sometimes installed in areas where the mutual spacing is unilaterally smaller. In the above embodiment, two sets of runaway prevention devices 8 are provided on both sides of the connecting ends of the pair of panels 3 and 5, but only one set of runaway prevention devices is provided at an appropriate position at the connecting ends of the panels. Alternatively, 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; FIG. 1 is a side view of the hatch cover, and FIG. 2 is an enlarged sectional view of the runaway prevention device shown in FIG. 1. 2...hatch cover, 3, 5...panel, 8...
...Runaway prevention device, 9...Air cylinder, 11...
Piston, 12... Rod, 14, 16... Air chamber, 15, 17, 18... Air port, 19... 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 air cylinder 9 and a piston 11 slidably fitted into the cylinder 9 are arranged at a portion where the mutual distance gradually decreases.
One end of the rod 12 is fixed to the cylinder 9 and protrudes from the other end of the cylinder 9, and is rotatably attached to the air chamber 14 on the rod side of the cylinder 9.
An air port 15 with a relatively large area and low resistance is provided in the wall, and an air port 17 with a relatively small cross-sectional area and large resistance is provided in the wall of the air chamber 16 on the head side of the cylinder 9. Air chamber 1
An air port 18 with a relatively large cross-sectional area and low resistance is provided on the upper wall of the air chamber 6, and the wall outside the air port 18 allows air to flow out from the air chamber 16 to the outside, but due to its own weight, the air port 18 A lid 19 that prevents air from entering the air chamber 16 from the outside by sealing the
A device to prevent the hatch cover from running out of control on ships where the hatch cover is rotatably installed.