JPH09303462A - Air cushion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the shock absorbing property and enable a heavy object to be dropped by providing rupture valves each having a rupture membrane ruptured by the gas pressure via compression on an air cushion main body filled with gas. SOLUTION: This air cushion main body 1 is divided into multiple air chambers 11-15, rupture valves 2 are provide on the air chambers 11-15 respectively, and communication holes are provided on the air chambers 11-15 to communicate them together. A rubber rupture membrane 21 is used for each rupture valve 2, and the rupture membrane 21 is fixed to the exhaust port 17 of the air cushion main body 1 by sewing or sticking. When the air pressure in the air cushion main body 1 is abruptly increased by a shock, the rupture membranes 21 are ruptured to communicate the inside of the air cushion main body 1 to the outside air, the shock absorbing property can be improved, and a heavy object can be dropped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air cushion, and more particularly to an air cushion that absorbs impacts when landing when dropping materials from an aircraft and cushions impacts when a heavy object (for example, a vehicle) collides.

[0002]

2. Description of the Related Art When a material is dropped from an aircraft, as shown in FIG. 7, the material M is currently fixed to a metal platform F by a material fixing cord R and is lowered by a parachute P. In this case, for shock absorption,
Paper honeycomb H between platform F and material M
Is inserted.

[0003]

However, as described above, the impact mitigation at the time of landing is carried out by the paper honeycomb H interposed between the platform F and the material M as described above.
However, since the impact relaxation rate is low, a situation such as bouncing or overturning when landing may occur. For this reason, there are drawbacks that the weight of the material M is limited, and that a large size parachute P is required when a predetermined material M is dropped.

The present invention has been made in view of the above-mentioned problems, has a better shock absorbing property than the conventional one, and a parachute of the same size can drop a heavier material than the conventional one. The purpose is to provide an air cushion.

[0005]

In order to solve the above problems, an air cushion according to the present invention is provided with an air cushion body capable of being filled with gas, and the air cushion body is provided with a compressed air cushion body. It is characterized in that it is equipped with a burst valve having a membrane that bursts under gas pressure.

According to the present invention, when an impact is applied when the material lands, the air cushion is compressed, and as a result, the membrane is ruptured by the internal pressure and the gas is quickly discharged from the exhaust valve. Therefore, the impact is caused by the air layer,
Further, there is an advantage that it can be mitigated by discharging the air and that the material does not bounce upward. In addition, since it is filled with gas to expand it, there is an advantage that the gas can be discharged, folded, and transported and stored, and the weight does not become so large.

[0007]

FIG. 1 is a side view of an embodiment of the air cushion according to the present invention, and FIG. 2 is a sectional view of the above embodiment. As is clear from these figures, the air cushion according to the present invention is Is provided with an air cushion body 1. This air cushion body 1 is divided into a plurality of air chambers 11, 12, 13, 14, 15 in this embodiment, and the air chambers 11, 12, 13, 14, 1 are each divided.
A burst valve 2 is provided in each of the parts 5. Furthermore, the air chambers 11, 12, 13, 14, and 15 have a structure in which a communication hole 16 is provided so as to communicate with each other. By providing a plurality of air chambers in this manner, shape retention of a predetermined shape such as a rectangular shape becomes easy.

The rupture valve 2 described above uses a rupturable membrane 21 as shown in FIGS. The rupture film 21 is made of rubber, for example, and is fixed to the exhaust port 17 of the air cushion body 1 by sewing or bonding. When the air pressure in the air cushion body 1 suddenly rises due to an impact, the air cushion body 1 ruptures and communicates with the outside air. In this case, since the exhaust valve has no metal portion, it can be folded into a small size during storage and transportation, and the metal parts do not scatter due to impact.

The rupture film of the rupture valve 2 may be one kind, but as shown in FIG. 4, rupture films 22, 23 and 24 having different rupture strengths may be provided concentrically. Good. In this case, the burst film 22 at the center has the lowest burst strength, and the burst strength gradually increases. By sequentially adjusting the burst strength of the burst film in this manner, the burst film is burst from the center, and the shock absorbing effect is enhanced.

As a method of expanding the air cushion main body 1, for example, a gas generator method of expanding a bag by using a combustion gas of explosive or a gas generator is used to expand several air columns and ram pressure is applied between the air columns. There is a method of expanding. Among them, the method of taking air into the air cushion body 1 by the ram pressure and expanding the air is as follows.
Air intakes 18 on one or more bottom surfaces of 13, 14, 15
A check valve 19 is provided at the air intake port 18
It has a structure with. The check valve 19 is, for example, as shown in FIG. 5, a mesh 191 stretched over the air intake port 18 and a trumpet tube 192 made of cloth standing upright around the mesh 191 or the air intake port 18.
Can have a structure with. In this case, when the air cushion provided in the lower portion of the platform F descends, air flows into the air cushion body 1 from the air intake port 18 via the mesh 191 provided on the bottom surface. The mouth 1 of the trumpet tube 192 that flows in at this time
Although 93 is released, when the inflow pressure of air becomes small, the internal pressure in the air cushion main body 1 causes the opening 19
3 will be closed and will act as a check valve.

When the air cushion according to the present invention is used to drop the material from the aircraft, the material M is fixed to the surface of the platform F by the rope R as shown in FIG. 6, and the air cushion is attached to the platform. Attach to the back of F.

When the material M is dropped from the aircraft together with the platform F, the parachute P opens to relax the descent speed. Due to this lowering, the air cushion body 1 receives air pressure from below, so that the air intake port 18 formed in the bottom surface of the air cushion body 1 is passed through the mesh 191 and the trumpet tube 192.
Air will flow into the air cushion body 1.
The air chambers 11, 12, 13, 14, 15 communicate with each other through holes 16
Since they are communicated by the air cushion body 1,
The whole expands (see FIG. 6).

When the material M lands, the air cushion provided under the platform F lands first, and the air cushion is compressed. Due to this increase in internal pressure due to compression, the burst valve 2 bursts and shock absorption due to exhaust resistance is performed. That is, since the impact at the time of landing is alleviated by the impact relaxation by the air layer and the exhaust resistance of the air, and since the air is discharged as described above, the material M can be prevented from bouncing, Rollover is less likely to occur when landing.

In the above description, the air cushion, which is installed at the lower part of the platform for fixing the materials when dropping various materials with the parachute, and absorbs the impact at the time of dropping, is described. Obviously, it can be used as an air cushion used for cushioning shocks.

[0015]

As described above, according to the air cushion of the present invention, since the burst valve is used, the gas in the air cushion can be quickly discharged, and the gas layer and the exhaust resistance cause the shock. There are advantages that the absorption can be performed quickly and the bounce action can be suppressed to a minimum.

[Brief description of drawings]

FIG. 1 is a side view of an air cushion according to the present invention.

FIG. 2 is a sectional view of the air cushion.

FIG. 3 is a sectional view of a burst valve.

FIG. 4 is a plan view of the burst valve.

FIG. 5 is an explanatory diagram of a check valve.

FIG. 6 is an explanatory view showing a usage state.

FIG. 7 is an explanatory view of dropping a material by a conventional parachute.

[Explanation of symbols]

 1 Air cushion body 2 Bursting valve 21 Bursting membrane 19 Check valve

Claims (3)

[Claims] 1. An air cushion body capable of being filled with gas,
An air cushion, comprising: a rupture valve provided in the air cushion body, the rupture valve having a rupture film that ruptures by gas pressure due to compression of the air cushion body. 2. The air cushion according to claim 1, wherein the burst valve is a burst film having a structure in which burst strength increases concentrically from the center. 3. The air cushion according to claim 1, wherein the air cushion is provided below the material when the material is dropped by a parachute.