JPH10332009A - Air injection port for gas chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a function preventing come off of a supply air hose at air injection time relating to an air injection port for a gas chamber. SOLUTION: This air injection port for a gas chamber, in a gas chamber outer side port part of an almost cylindrical injection port main body 1, is formed by screw mounting replaceable an air-tight cover 2 and a supply/ discharge nozzle 3. The supply/discharge nozzle 3 has a hose connection port 3b fitting a supply air hose c connected and a screw port part screwed relating to the gas chamber outer side port part of the injection port main body 1. At air injection time, this supply/discharge nozzle 3 is screw connected to the injection port main body 1, come off of the supply air hose c is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an air inlet used for an air chamber of an air tent.

[0002]

2. Description of the Related Art Conventionally, an air tent has been developed as a large tent that is temporarily installed in the event of a disaster such as an earthquake. As shown in FIG. 10, the air tent is formed by connecting an air chamber formed in a columnar shape in an arch shape.
An air chamber unit 101 serving as a framework of the tent is formed, and a plurality of the air chamber units 101 are connected to form a frame 100 of the air tent. The air tent is formed by covering a sheet (not shown) on the frame 100.

The air tent is provided in each air chamber unit 10.
A nozzle 104a of an air supply hose 104 connected to an air cylinder 103 is connected to each of the air inlets 102 provided one by one, and air is simultaneously injected from each air inlet 102 so that each air chamber unit 101 is connected. The frame 100 is assembled by substantially uniformly expanding the frame.

As shown in FIGS. 11 and 12, the air inlet 102 is formed by screwing a substantially cylindrical inlet main body 120 to a rubber pedestal 200 attached to the outer peripheral surface of the air chamber unit 101. By fixing them together, they form an opening communicating between the inside and outside of the air chamber unit 101. In addition, a one-way valve 12 for preventing backflow of air in the air chamber unit 101 is provided at the air chamber side port of the inlet main body 120.
1, and an airtight lid 122 is detachably screwed onto the outer periphery of the air chamber outer opening of the main body 120.

[0005]

When air is to be injected from the air inlet 102 as described above, the nozzle 104a provided at the end of the air supply hose 104 is inserted into the air chamber outer opening of the inlet main body 120. The air is inserted from the air cylinder 103 in this state.

However, since the air injection by the air cylinder 103 is rapidly performed at a high pressure, the air supply inserted into the air injection port 102 is caused by the pressure increase in the air chamber unit 101 and the vibration at the time of injection. Nozzle 10 of hose 104
There was a case where 4a came off and went around on the spot.
Further, although the resin ring 105 for holding the air supply hose 104 is provided at the air injection port 102, the detachment of the air supply hose 104 could not be effectively prevented due to insufficient holding power.

Each air chamber unit 101 of the above air tent
If the inflation does not progress simultaneously, the frame 10
In order to hinder the assembly of the air inlets 0, when performing the air injection work as described above, one worker was attached to each air injection port 102, and the air supply hose 104 was held down so as not to come off. As a result, the construction of the air tent required a large number of personnel.

On the other hand, when each of the air chamber units 101 expanded as described above is contracted, the inlet main body 120 of the air inlet 102 is removed from the pedestal 200, and the inlet main body 120 is screwed. Air chamber unit 10
The air in 1 is flowing out. In addition, as described above, in the exhaust depending on the natural outflow of air, the air chamber unit 101
It takes a lot of time to completely exhaust the air inside. Therefore, an exhaust hose is connected to the suction port of the air supply / exhaust device such as a blower, and the tip end of the exhaust hose is inserted into the opening from which the inlet body 120 has been removed to suck air remaining in the air chamber unit 101. In some cases, exhaust is forcibly performed.

However, when performing the suction operation by inserting the exhaust hose into the opening as described above, a worker who holds the exhaust hose inserted into the opening is required, and the air chamber unit is required. The inner surface of the contracted and loosened air chamber may be attracted to the tip end of the exhaust hose inserted into the inside of the air chamber 101, which may cause troubles such as incapable of smooth exhaust, and exhaust of air in the air chamber unit 101. It hindered the work.

[0010] It is an object of the present invention to reliably prevent the supply air hose from coming off during air injection into the air injection port for the air chamber as described above, and to smoothly perform forced exhaust using an exhaust hose. It is to provide a function that can be carried out.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention comprises a substantially cylindrical inlet main body for communicating the inside of an air chamber with the outside of the air chamber, and the inlet main body. A one-way valve that allows the flow of air from outside the air chamber to the air chamber and prohibits the flow of air from the air chamber to the outside of the air chamber. And an air supply / exhaust nozzle are exchangeably screwed to each other, and the air supply / exhaust nozzle is provided with a screw lid which is screwed to the air chamber outside opening of the inlet main body. An opening for communicating between the room and the outside of the air chamber is provided, and a connection port for an air supply / exhaust hose protruding to the outside of the air chamber and a valve pressing body protruding to the air chamber side are attached to the opening. It is configured to be rotatable with respect to the lid, and in a state where the screw lid is screwed into the air chamber outside port of the inlet main body, the valve pushing body is Ri is obtained by adapted allowed to open whereas the valve.

According to the above-described air inlet, the airtight lid and the air supply / exhaust nozzle can be exchangeably screwed to the air chamber outer opening of the inlet main body. For example, when the airtight lid is screwed into the air chamber outer opening of the inlet main body, the inlet is double-closed by the one-way valve and the airtight lid, and air in the air chamber flows out of the air inlet. Can be prevented.

Further, when the screw lid of the air supply / exhaust nozzle is screwed into the air chamber outer opening of the inlet main body, the screwing relation is established through the screwing relation.
The supply / exhaust nozzle is fixed in a state connected to the inlet main body. Then, the air supply /
When the exhaust hose is connected and air is supplied, the one-way valve is opened to supply air into the air chamber and expand the air chamber. In the state where the screw lid of the air supply / exhaust nozzle is screwed into the air chamber outside opening of the inlet body as described above, the valve pressing body of the air supply / exhaust nozzle is inserted into the inlet body, and the inlet is closed. The one-way valve provided on the main body is pushed to keep the valve open.

When the injection of air into the air chamber is completed and the screw lid of the supply / exhaust nozzle is removed from the inlet main body, the one-side valve pushed by the valve pressing body is closed, and the inlet main body is closed. The outflow of air from the air is prevented. When the supply / exhaust nozzle is removed from the inlet main body, the closing of the one-way valve is momentarily delayed to cause slight air leakage, but the amount is small and negligible.

On the other hand, when the air chamber in the inflated state is contracted, the air supply / exhaust nozzle is mounted in place of the airtight lid screwed to the air chamber outside port of the inlet body as described above. In addition, a supply / exhaust hose is connected to the connection port of the supply / exhaust nozzle,
Start suction. In this state, the one valve of the inlet main body is pushed by the valve pushing body of the supply / exhaust nozzle to keep the valve opened. Air supply as described above /
When suction is performed from the exhaust hose, the air in the air chamber is forcibly discharged, and can be discharged in a short time.

Since the connection port for the air supply / exhaust hose and the valve pressing body are rotatably fitted to the screw cover, the screw cover is connected to the air chamber of the inlet body. Even when the screw is being screwed or unscrewed from the outer opening, the screwed lid idles with respect to the connection port and the valve pressing body. The air supply / exhaust hose and the valve pusher connected to the connection port do not rotate with the rotation of.

The above-described valve pushing body of the supply / exhaust nozzle may be configured so as to be connectable to and disconnectable from the threaded lid and the connection port for the supply / exhaust hose. In this case, the valve pusher that opens the one-way valve can be separated / connected to the screw-on lid and the air / exhaust hose connection port. Therefore, when the air supply / exhaust nozzle is used for air supply, it is used in a state in which the valve pushing body is removed, so that the screw lid is screwed into the air chamber outer opening of the inlet body. However, the one-way valve is not constrained by the pusher, and maintains the normally open / closed state. Therefore, since the one-way valve is closed at the same time as the end of the air supply operation, the air in the air chamber does not blow out when the screw cover is removed from the inlet body.

The valve pushing body of the air chamber air inlet is mounted and supported so as to be movable in the axial direction with respect to the screw-in lid and the supply / exhaust hose connection port, and the valve pushing body is projected. In this state, the one-way valve is opened by the valve pressing body, and when the valve pressing body is moved in the shortening direction, the valve pressing body is separated from the one-way valve and the same valve is closed. You may comprise so that a valve state may be maintained.

In this case, since the valve pusher moves in the projecting and shortening direction with respect to the threaded lid and the connection port for the supply / exhaust hose, in a state where the valve pusher is moved in the shortening direction,
When the screw cap is screwed into the air chamber outside port of the inlet main body, the one valve is separated from the one valve, and the one valve maintains the closed state. That is, in the state in which the valve pressing body is moved backward, the supply / exhaust nozzle according to the second aspect functions in the same manner as the state in which the valve pressing body is removed. In the state in which the valve pusher is moved in the protruding direction, the one-way valve is opened by the valve pusher in the air supply nozzle according to the second aspect, similarly to the state in which the valve pusher is attached. Become.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an air inlet a for an air chamber according to the present invention. The air chamber b in which the air inlet a is provided is a substantially cylindrical bag-like body formed by using a rubber cloth, for example, each air chamber forming the frame 100 of the air tent as shown in FIG. Unit 10
Used as 1.

The air inlet a is provided at a predetermined location of the air chamber b, for example, in the case of the air chamber unit 101 of the air tent, at a peripheral surface near the installation portion of the air chamber b formed in a substantially arch shape. , A base 10, an inlet main body 1, an airtight lid 2, and a supply / exhaust nozzle 3.

A circular pedestal 10 made of a rubber material is adhered and fixed to the installation location of the air inlet port a in the air chamber b. The pedestal 10 has a cylindrical body 10a integrally fitted at the center thereof, and a hollow portion of the cylindrical body 10a is a mounting hole a0 into which an inlet main body 1 described later is screwed.

The injection port body 1 is a cylindrical body made of a synthetic resin or the like. A flange 11 is integrally provided around an intermediate portion of the outer peripheral surface. A screw portion 1a into which the airtight lid 2 is screwed is threaded. In addition, the collar 1
A screw portion 1b screwed into the mounting hole a1 of the pedestal 10 is threaded on the outer peripheral surface on the other end side of 1. The inlet body 1
Is screwed into the mounting hole a1 of the base 10 via the packing 12.

A one-way valve 4 is provided at the other end of the inlet main body 1, that is, at the inside of the air chamber b of the inlet main body 1. On the other hand, the valve 4 includes a valve seat 4b provided in the other end of the inlet main body 1 and a rubber valve body 4a seated on a surface of the valve seat 4b inside the air chamber b. It functions to allow the flow of air from the supply / exhaust nozzle 3 connected to one end to the inside of the air chamber b, and to prevent the outflow of air from the inside of the air chamber b to the outside.

A connecting band 20 made of a soft synthetic resin is fitted to one end of the inlet main body 1, that is, an outer peripheral portion of the outside of the air chamber b of the main body 1. The lid 2 is attached. The airtight lid 2 is provided on the inlet main body 1.
Is a lid which is fitted to one end of the inlet to close a flow path in the inlet main body 1, and has a screw portion 1 a on the inner peripheral surface of the lid of the inlet main body 1. The female screw portion 2a to be screwed into is formed. A disk-shaped packing 21 is fitted inside the hermetic lid 2, and the end face of one end of the inlet main body 1 is in the state where the airtight lid 2 is screwed into one end of the inlet main body 1. It is configured so as to be kept airtight by being pressed against the packing 21 (FIG. 3).

Further, the air inlet a of the present application is connected to one end of the inlet main body 1 with the airtight lid 2 and the supply / exhaust nozzle 3.
And can be replaced. The air supply / exhaust nozzle 3 has a screwed lid 3a screwed to the inlet main body 1 like the airtight lid 2, and a hose connection port 3b for connecting the air supply / exhaust hose c.
And a valve pressing body 3c for opening the one-way valve 4.

The hose connection port 3b is formed of a synthetic resin or a metal such as aluminum, and has a tapered outer diameter at one end to form a connection portion 3 'for fitting the supply / exhaust hose c. I have. A short cylindrical mouth member 3b 'is internally fitted and adhered to the other end of the hose connection port 3b, and a step portion 34 is provided between the mouth member 3b' and the hose connection drive 3b. The screw lid 3a is rotatably fitted to the step 34. Note that a step may be provided on the outer periphery of the hose connection port 3b to prevent the hose from coming off, so that a so-called bamboo shoot nipple may be formed.

The screw-in lid 3a is formed in substantially the same shape as the above-mentioned airtight lid 2, and an opening 32 formed in the center is fitted into the step 34 of the hose connection port 3b, and the hose connection port 3b is rotated. Supported as possible. Similarly to the airtight lid 2, a female screw part 33 to be screwed to the screw part 1a at one end of the inlet main body 1 is formed on the inner peripheral surface of the screw lid 3a.

A valve pusher 3c is detachably fitted to the other end of the hose connection port 3b, and the valve pusher 3c is supported so as to protrude from the screwing lid 3a toward the inside of the air chamber b. I have. The valve pressing body 3c is for opening the valve body 4a of the one-way valve 4 by pressing the valve body 4a of the one-way valve 4 in a state where the screw-in lid 3a is screwed into the inlet main body 1, and is formed in a substantially cylindrical shape using a synthetic resin or the like. I have. A fitting portion 35 detachably fitted to the other end of the hose connection port 3b at one end of the valve pressing body 3c.
Is formed to protrude. A packing 35a made of a rubber material or the like is fitted on the outer peripheral surface of the fitting portion 35 so that the packing 35a can be easily attached to and detached from the other end of the hose connection port 3b. The valve pressing body 3c is integrated with the hose connection port 3b in a state where it is connected to the other end of the hose connection port 3b, and is rotatably supported by the screwing lid 3a.

At the rim of the protruding end of the valve pressing body 3c,
Four push rods 36 protrude. Each push rod 3 described above
Numeral 6 is formed so as to be inserted into the gap 4c of the valve seat 4b of the one-way valve 4 at regular intervals along the circumference of the protruding end edge of the valve pressing body 3c. Therefore, the valve pressing body 3c is
In a state where the screwing lid 3a is screwed into the injection port main body 1, each pushing rod 36 at the tip is inserted into the gap 4c of the valve seat 4b of the one-way valve 4, and the valve body 4a is moved by the pushing rod 36 into the air chamber b. It is configured to be pushed open toward the inside (FIG. 1). That is, in a state where the supply / exhaust nozzle 3 is attached to the inlet main body 1,
On the other hand, the valve 4 maintains the valve open state. The number of the pushing rods 36 of the valve pushing body 3c and the gap 4 of the one-way valve
The arrangement of c and the like may be arbitrarily changed.

As described above, the hose connection port 3b and the valve pressing body 3c are rotatably attached to and supported by the screwing lid 3a, so that the supply / exhaust hose c is fitted into the hose connection port 3b. When the screw lid 3a is attached to and detached from the screw portion 1a of the inlet main body 1, the rotation of the screw lid 3a can be absorbed by the connection between the two members 3a and 3b. The attachment and removal of the screw lid 3a can be performed smoothly without twisting the supply / exhaust hose c.

The valve pressing body 3c is connected to the hose connection port 3b.
When the screw-in lid 3a is screwed into the inlet main body 1, the pushing rod 36 of the valve pushing body 3c is moved by the gap 4c of the valve seat 4c of the one-way valve 4 when the screw-in lid 3a is screwed into the inlet body 1. Even when inserted into the valve pushing body 3c, the rotational difference between the screw-in lid 3a and the valve pushing body 3c is absorbed by the connecting portion, and the valve pushing body 3c
Can be held in a non-rotating state. The fitting portion between the hose connection port 3b and the screwing lid 3a has a slight clearance, so that during the air supply work, a slight air leak occurs from the fitting portion, but the amount of air leaking out is small. There is no problem in work because it is a small amount.

The air inlet a configured as described above is provided with a supply / exhaust nozzle at one end of the inlet main body 1 when air is injected into the air chamber b and when air in the air chamber b is exhausted. 3 is screwed to perform an air supply operation or an exhaust operation. At other times, the airtight lid 2 is screwed to one end of the inlet main body 1.

For example, as shown in FIG. 10, when air is to be injected into the air chamber b constituting the air chamber unit 101 of the air tent, the valve pressing body 3c is removed, and the air is injected into one end of the inlet main body 1. The screwing lid 3a of the air supply / exhaust nozzle 3 is connected by screwing. In this state, the supply / exhaust nozzle 3
The screwing lid 3a and the one end of the injection port main body 1 are firmly connected by a screwing relation (FIG. 2).

Hose connection port 3 at one end of supply / exhaust nozzle 3
b, a terminal port of a supply / exhaust hose c connected to an air cylinder or a blower (not shown) serving as an air supply source is fitted, and a hose band c1 is fitted around the fitting portion.
To prevent the supply / exhaust hose c from coming off. The supply / exhaust hose c may be connected to the connection 3b 'of the supply / exhaust nozzle 3 in advance. Further, in the present embodiment, the supply / exhaust hose c for both supply and exhaust is used as the hose connected to the hose connection port 3b of the supply / exhaust nozzle 3, but the supply-only hose and the exhaust-only hose are exchanged. Connection.

Next, an air supply / exhaust device such as a blower is operated to supply air from a supply / exhaust hose c, and compressed air is sent into the air chamber b to expand the air chamber b.
At this time, the one-way valve 4 is opened by the supply pressure to allow the flow of air into the air chamber b. Incidentally, as shown in FIG.
When air is simultaneously injected into a plurality of air chamber units (air chambers), supply / exhaust hoses c are respectively connected to the plurality of air inlets a, which are configured similarly to the air inlets a, and Thereafter, air is simultaneously injected from each of the supply / exhaust nozzles 3.

At the time of air injection, a high pressure is applied to the connection between the air injection port a and the air supply / exhaust nozzle 3, but the air supply / exhaust nozzle 3 is connected between the screwed lid 3a and one end of the air inlet body 1. Since the connection is made firmly by the screwing relationship, the supply / exhaust nozzle 3 does not come off even if vibrations due to internal pressure or air flow are applied.

When the inside of the air chamber b rises to a predetermined pressure by the injection of air, the injection of air from the air cylinder is stopped. Then, the screwed lid 3a of the supply / exhaust nozzle 3 is removed from the inlet main body 1, and the airtight lid 2 is screwed into the air inlet a instead. When the supply / exhaust nozzle 3 is removed from the inlet main body 1, the one-way valve 4 closes instantaneously to prevent the outflow of air.

On the other hand, when the air in the air chamber b is exhausted,
With the valve pusher 3c connected to the other end of the hose connection port 3b, the screwing lid 3a of the supply / exhaust nozzle 3 is screwed and connected to one end of the inlet main body 1. In this state, the supply / exhaust nozzle 3 is firmly connected by the screwing relation between the screwing lid 3a and one end of the inlet main body 1, and the valve body 4a of the one-way valve 4 pushes the valve pressing body 3c. It is pushed and held by the rod 36 (FIG. 1). The air in the air chamber b may be naturally exhausted by using the air pressure in the air chamber b. However, when the air is completely exhausted in a short time, the air is exhausted into the hose connection port 3b of the air supply / exhaust nozzle 3. Hose c is connected and forced exhaust is performed.

When the forced exhaust is performed, the base end of the supply / exhaust hose c is connected to a suction port of a supply / exhaust device such as a blower (not shown), and suction of air from the supply / exhaust hose c is started.
As a result, the air in the air chamber b is forcibly exhausted through the one-way valve 4 and the supply / exhaust nozzle 3 which are opened as described above. Although the air chamber b shrinks with the progress of the exhaust, the air supply / exhaust nozzle 3 is supported by being screwed and connected to the inlet main body 1 firmly fixed by the pedestal 10, and thus is maintained in a stable state. You. Further, since the gap 4c of the valve seat 4b serving as a suction port at the time of exhaust is surrounded by the hard and strong pedestal 10, the inner surface of the air chamber b which has contracted and slackened is reduced by the gap 4c.
It is possible to avoid a problem in which the object is sucked and adsorbed.

Next, the air inlet a2 shown in FIGS. 5 to 8 will be described. The air inlet a2 has substantially the same configuration as the air inlet a described above, except that a fitting portion 37 is formed at the base end of the valve pressing body 3c of the supply / exhaust nozzle 3 '.
Is slidably fitted into the other end 39 of the hose connection port 3b. On the outer peripheral surface of the fitting portion 37 of the valve pressing body 3c, a guide portion 37a extending in a band shape in the axial direction is protruded. When the fitting portion 37 is fitted into the other end 39 of the hose connection port 3b as described above, the guide portion 37
a slides along a guide groove 37b recessed in the other end 39. The guide portion 37a
Is partially separated from the fitting portion 37 to form an elastic piece. When the fitting portion 37 is fitted into the hose connection port 3b,
It is configured to bend appropriately toward the axis of the valve pressing body 3c (FIGS. 5-a and 5-b).

On the surface of the guide portion 37a, an engagement projection 38a is provided so as to project therefrom, and the projection 38a is provided in the engagement recess 3 provided in the guide groove 37b of the other end 39 of the hose connection port 3b.
8b and 38b ', it is configured to be able to change the amount of protrusion of the valve pressing body 3c with respect to the screwing lid 3a by being locked. Therefore, when the valve pressing body 3c is manually pulled out and the engaging projection 38a is engaged with the engaging recess 38b ', the valve pressing body 3c is held in a protruding state, as shown in FIG. Thus, the valve element 4a of the one-way valve 4
Is opened. When the valve pressing body 3c is pushed in and the engaging projection 38a is engaged with the engaging recess 38b, the amount of projection of the valve pressing body 3c becomes small, and as shown in FIG. The tip is located between the hand of the valve element 4a of the one-way valve 4, and the same valve 4 is closed.

When the air supply operation is performed using the air injection port a2 configured as described above, after the valve pressing body 3c is pushed in, the air supply / exhaust nozzle 3 'is inserted into the injection port main body 1.
Is attached (FIG. 5-a). In this case, since the amount of protrusion of the valve pressing body 3c is small, the one-way valve 4 is kept closed, and at the time of air supply, the same valve 4 is opened by the pressure of the compressed air supplied from the supply / exhaust hose c. The air is supplied into the air chamber b.

On the other hand, at the time of exhaust, the supply / exhaust nozzle 3 'is attached to the inlet body 1 after the valve pressing body 3c is pulled out (FIG. 6). In this case, the amount of protrusion of the valve pressing body 3c increases, and the one-way valve 4 is held in an open state by the pressing rod 36 of the valve pressing body 3c, so that forced exhaust is enabled. According to the air inlet a2 configured as described above, the air supply operation and the exhaust operation can be easily performed only by changing the amount of protrusion of the valve pressing body 3c. Further, since there is no need to remove the valve pressing body 3c, there is no risk of losing the valve pressing body 3c.

Next, the air inlet a3 shown in FIG. 9 will be described. The air inlet a3 is the same as the air inlet a described above.
However, the fitting / inserting portion 37 is fitted to the base end of the valve pressing body 3c of the supply / exhaust nozzle 3 '' with the other end of the hose connection port 3b, and is adhered or caulked. By
The two members 3b and 3c are integrally formed. Since the above-mentioned air injection port a3 is configured by integrating the valve pressing body 3c and the hose connection port 3b, both in the case of the air supply work and in the case of the exhaust work, as shown in FIG. Valve pusher 3
It is used with the one-way valve 4 opened in c.

When performing the air supply operation at the air inlet a3, the air supply operation is performed while the one-way valve 4 is opened by the valve pressing body 3c. Then, when the air supply operation is completed, the air supply / exhaust nozzle 3 ″ is promptly removed from the inlet main body 1. At this time, the closing of the one-way valve 4 is delayed until the pushing rod 36 is completely pulled out, so that a slight air leak occurs, but the amount is small and does not pose a problem. In addition, the exhaust work at the air inlet a3 described above is as follows.
This is the same as the case of the air inlets a and a2, and suction may be performed from the supply / exhaust hose c in the state shown in FIG. Further, in each of the embodiments described above, the case where the air inlet unit is used for the air chamber unit of the air tent is described. However, the air injection port of the present invention may be used for an air chamber other than the air tent, for example, the air chamber of a rubber boat.

[0047]

As described above, according to the present invention, the airtight lid and the air supply / exhaust nozzle for connecting the air supply / exhaust hose are exchangeably screwed to the air chamber outside opening of the inlet body. When the air supply port is connected to the air supply hose to expand the air chamber, the screw hole of the air supply / exhaust nozzle and the air injection port to which the airtight lid should be screwed. By utilizing the screwing relationship, the terminal port of the air supply hose can be securely connected to and fixed to the air inlet.

Therefore, even when air is injected at a high pressure from the air supply hose, it is possible to reliably prevent the air supply hose connected to the air injection port from being disconnected during the operation. Further, when injecting air into the air chamber, there is no need to manually hold the air supply hose connected to the air injection port. When the air injection is performed simultaneously from the air injection port, the labor required for the work can be greatly reduced. Further, after the air injection operation, the airtight lid can be screwed in place of the air supply / exhaust nozzle to maintain the airtightness similarly to the conventional air injection port.

On the other hand, when the exhaust hose is connected to the air inlet to forcibly exhaust the air in the air chamber, the air supply / exhaust is carried out with the screwing lid screwed to the air chamber outer opening of the inlet body. Since the valve pushing body of the nozzle can maintain the state in which the one valve of the inlet main body is opened, the air in the air chamber can be quickly sucked through the air supply / exhaust nozzle and forcedly exhausted. Further, since the inlet main body is firmly installed on the wall surface of the air chamber via a reinforcing material such as a pedestal, the air passage of the inlet main body is stably held even during forced evacuation, and the contracted air chamber is maintained. It is possible to avoid a problem that the surface is attracted.

Like the air inlet for the air chamber according to the second aspect, the valve pressing body of the air supply / exhaust nozzle is configured to be connectable to and disconnectable from the threaded lid and the air / air exhaust hose connection port. In, when the air supply / exhaust nozzle is used for air supply, by using the valve pushing body removed, the normal valve function can be maintained without restraining the one-way valve. Therefore, after the air supply operation is completed, the screw lid is removed from the inlet main body, and at the same time, the one-way valve is closed, so that air can be prevented from being ejected when the air supply / exhaust nozzle is removed.

According to the third aspect of the present invention, the air inlet for the air chamber is mounted and supported so that the valve pushing body of the supply / exhaust nozzle can move forward and backward with respect to the screwing lid and the connection port for the supply / exhaust hose. Therefore, in a state where the valve pressing body is retracted, even in a state where the supply / exhaust nozzle is screwed into the air chamber outside port of the inlet main body, without restricting the one-way valve, as usual. Valve function can be maintained. Therefore, after the air supply operation is completed, the screw lid is removed from the inlet main body, and at the same time, the one-way valve is closed, so that the ejection of air when the air supply / exhaust nozzle is removed can be avoided.

In the state where the valve pusher is advanced, the one-way valve is opened by the valve pusher when the supply / exhaust nozzle is screwed into the air chamber outside port of the inlet body. As in the first aspect, forced exhaust can be performed reliably and smoothly. Further, the valve pushing body is
Although it is attached and supported so as to be able to move forward and backward with respect to the screwing lid and the supply / exhaust hose connection port, it does not separate, so there is no fear of being lost during use.

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing an exhaust state of an air injection port embodying the present invention.

FIG. 2 is a longitudinal sectional view showing a supply state of the air inlet.

FIG. 3 is a perspective view showing the air inlet.

FIG. 4 is a longitudinal sectional view showing an airtight state of the air inlet.

5A is a longitudinal sectional view showing an air supply state of an air injection port in which a valve pressing body is configured to be slidable, and FIG.
FIG. 5A is a sectional view taken along line VV.

FIG. 6 is a longitudinal sectional view showing an exhaust state of the air inlet.

FIG. 7 is a longitudinal sectional view showing a hose connection port of the air injection port.

FIG. 8 is an exploded perspective view showing a supply / exhaust nozzle of the air inlet.

FIG. 9 is a longitudinal sectional view showing an air injection port in which a hose connection port and a valve pressing body are integrated.

FIG. 10 is a perspective view showing a state in which air is injected from an air cylinder into an air chamber unit of an air tent.

FIG. 11 is a perspective view showing a conventional air inlet.

FIG. 12 is a longitudinal sectional view showing the air inlet.

[Explanation of symbols]

 a, a2, a3 ... air inlet b ... air chamber c ... supply / exhaust hose 1 ... inlet main body 2 ... airtight lid 3 ... supply / exhaust nozzle 3a ... screwing Lid 3b Hose connection port 3c Valve presser 4 One-way valve 4a Valve

Claims (3)

[Claims] A substantially cylindrical inlet main body communicating between the inside of the air chamber and the outside of the air chamber, wherein the inlet main body allows a flow of air from outside the air chamber to the air chamber; and A one-way valve for inhibiting the flow of air from the air chamber to the outside of the air chamber is provided, and an airtight lid and a supply / exhaust nozzle are interchangeably screwed to the air chamber outside port of the inlet body. The supply / exhaust nozzle includes a screw-in lid that is screwed into the air-chamber outside opening of the injection port main body, and the screw-in lid is provided with an opening that allows communication between the air chamber and the outside of the air chamber. A connection port for an air supply / exhaust hose protruding to the outside of the air chamber and a valve pushing body protruding to the inside of the air chamber are mounted, and are rotatable with respect to the screw cap. In the state of being screwed into the air chamber outside mouth of the inlet body,
An air inlet for an air chamber, wherein the one-way valve is opened by the valve pressing body. 2. The air inlet for an air chamber according to claim 1, wherein the valve pusher is configured to be connectable to and disconnectable from a screw-in lid and a connection port for an air supply / exhaust hose. 3. The valve pusher is mounted and supported so as to be movable in the axial direction with respect to the screw-in lid and the supply / exhaust hose connection port, and the valve pusher is moved in the projecting direction. In the above, in the state where the one-way valve is opened by the valve pushing body and the valve pushing body is moved in the shortening direction, the valve pushing body is separated from the one valve and the same valve maintains the closed state. The air inlet for an air chamber according to claim 1, wherein the air inlet is configured as follows.