Title:
Diving mask
United States Patent 2168695


Abstract:
The present invention relates to improvements I in a diving mask, which consists in dividing the main body of a mask to cover the face into an upper and lower compartments by a partition, Sclosing the front of the upper compartment tightly with a transparent glass plate, providing an air distributing...



Inventors:
Kumaki, Asari
Application Number:
US23185238A
Publication Date:
08/08/1939
Filing Date:
09/27/1938
Assignee:
Kumaki, Asari
Primary Class:
Other Classes:
128/205.13, 128/207.11, 128/207.12, 137/854
International Classes:
B63C11/02; B63C11/14
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Description:

The present invention relates to improvements I in a diving mask, which consists in dividing the main body of a mask to cover the face into an upper and lower compartments by a partition, Sclosing the front of the upper compartment tightly with a transparent glass plate, providing an air distributing pipe therein so as to spray the air under pressure supplied from an air feed pipe, against the surface of the said glass from the perforations of the said pipe, connecting flexible balance bags to the sides of the mask in such a manner that they communicate with the said upper and lower compartments respectively by means of separate. passages, of which the one 18 communicating with the lower compartment is provided with a normally-closed flap valve to prevent the counter-flbw of the gas from the said lower compartment to the balance bags, and providing the mask as the lower end portion with a non-return valve which is normally closed, but is opened by the increased pressure in the lower compartment. One of the objects thereof is to obtain a divina mask with balance bags which makes breathing under the water as easy as in 5 the air by maintaining air pressure substantially Suniformly and accordingly improves the eficiency of work and if necessary, can regulate the pressure of exhale air by merely adusting a -non-return valve manually and also has the ad3 vantage of keeping the glass clean by sweeping it continuously with compressed air.

The other object is to provide a diving mask which can be used easily without any skill.

The accompanying drawing shows an example 5 of the manner of carrying out the present invention into practice:Figure 1 is a general front view of a diving mask according.to this inventionFigure 2, a section on the line Hf- of Figure 1; 40 Figure 3, a section on the line II--Ml of Pigure 2; TFiure 4, an outer view of a non-return valve and d. Figure 5, a vertical sectional view of the same.

In the drawing, I is the main body of a mask to be fitted fast around the face. t has a piece of cloth 2 at the outside and is held in position by tightening the said cloth at the back of the head with clasps 3 and 3'. The cloth 2 is provided at the lower part with clasps 4 and 4' with which to tighten the mask under the jaws and prevent it from going out of position by being lifted by the buoyancy.

The interior of the main body I of the mask iS. artitioned at a position corresponding to the nidway of the nose and mouth by a partition 5 which contacts closely with the face resiliently it the lower part of the nose to cut off the direct low of air between the nose and mouth. The e ipper compartment is closed airtight at the front by a glass plate 6, and at its upper semi-circular portion has a semi-circular distributing pipe 8 wilh many perforations 1 and with its ends attached to supporting members 9 and 0 respectively, the said supporting member 9 having an axial bore which communicates with the above distributing pipe, so that air may be supplied to it through a flexible air pipe I from the mother ship. At either side of the mask slightly under the partition B there is a circular projection 12 to which to attach water-tight, a balance bag 13 consisting of a flexible rubber, enclosed by an outer cover, the said balance bag each having its inte- 2o rior communicate with the upper and lower compartments formed by the partition 5 through passageways 04 and 15 respectively. The passageway 15 which opens in the lower compartment is provided with a non-return flap valve 86, which gS is opened when the air pressure in the balance bags overcomes the pressure in the lower compartment, but is closed when the pressure of the air exhaled from the mouth becomes.great, thus checking the counter-flow of carbon dioxide to g the balance bags, which are connected together behind the neck by means of clasps iSa and I b.

The mask has at its lower end a non-returi valve as Indicated in Figures 4 and 5. I1 is a valve casing having a number of exhaust per- 5 forations 8I at its periphery, and a mouth piece 19 formed at its upper portion opens in the lower compartment through the main body of the mask and also is tightened water-tight against the said main body with a knurled nut 20. At the lower part of the valve casing I7 is tightened a cover nut 22 pierced with several perforations 2I and having a valve stem 23, which consists of Celluloid or the like material, inserted through its center. Between the two flanges 24 and 25 6 formed at the upper portion of the said stem is attached a disc valve 26 made of rubber. A spring 21 is mounted between the flange 25 and cover nut 22, so that the periphery of the said disc valve may always close the valve seat at the ag lower part of the mouth piece 19.

If you dive, wearing this mask and air is supplied from the air pipe 1I, the air will be supplied to the semi-circular pipe 8 from the axial bore of the supporting member 9 and be sprayed g6 against the glass plate 6 from the many perforations of the said pipe, thereby sweeping the surface of the said glass plate and keeping it clean, so that no inconvenience is felt in looking at the front through it. The air then is delivered into the balance bags 13 through the passageway 14 and Inflates the latter until it is balanced by the pressure of water in the diving position.

Subsequently, an excess of air pushes open the flap valve t1 and enters the lower compartment of the mask, where it is breathed with the mouth.

The exhaled air and an excess of air (if any) push open the disc valve 26 from the mouth piece 19 and is discharged into the water from the exhaust perforations I8 or 21. When the pressure in the lower compartment is far greater, it pushes down the disc valve 26 as a whole together with the valve stem, compressing the spring 27 and discharges the air quickly. Such action of this valve may be regulated suitably by turning the cover nut 22 and adjusting the spring 25.

According.to the present invention, the glass plate of the mask is kept clean by the compressed air blown continuously against it, and moreover the air contained in the balance bags being balanced by the pressure of water, it is possible to breathe under the water substantially as easily as in the air. If by any chance the water pressure brought upon the non-return valve is reduced in a work which necessitates turning the face upwards, an excess of air would leak out, pushing open the valve owing to the reduced pressure, but for the balance bags. As it is, in the present invention, since the said balance bags tend to be lifted by the buoyancy, in whatever position they may be and are balanced by the water pressure in that position, there is no apprehension of the air leaking out. Further, if necessary, by regulating the spring of the non-re49 turn valve simply and thus facilitating the exhaust of the air, it is possible to prevent the exhaled air from counter-flowing to the balance bags and mixing with fresh air.

I claim: 1. A diving mask comprising a main body forming a mask to cover the face, a partition 6 dividing said main body into an upper and lower compartment, a transparent glass plate tightly closing the front of the said upper compartment, a perforated air distributing pipe therein serving to spray air under pressure supplied from an air feed pipe against the surface of the said glass from the perforations of said air distributing pipe, flexible balance bags connected to the sides of the mask so as to communicate with the upper and lower compartments respectively by means of separate passages, a normally closed flap valve controlling the passage communicating with the lower compartment in order to prevent the counter-flow of the gas from the said lower compartment to the balance bags, and a non-return valve disposed at the lower end portion of the mask, which is normally closed but is opened by an increased pressure in the lower compartment.

2. A diving mask according to claim 1, which comprises a non-return valve consisting of a valve casing which has exhaust perforations formed at its periphery, a cover nut engaged with it and a.rubber disc valve supported by the said cover nut and continually pressed up by axspring; and a mouth piece which projects through the mask from the casing opening in the lower compartment, the said disc valve being adapted to cut off the communication between the said mouth piece and valve casing by its own resiliency in addition to the action of the mentioned spring.

3. A diving mask according to claim 1, which is provided with a piece of cloth upon the outside and with clasps for tightening the said cloth at the back of the head. iKUMAKI ASARI.