U.S. patent number 3,731,678 [Application Number 05/121,447] was granted by the patent office on 1973-05-08 for smoke inhalation protector.
This patent grant is currently assigned to Phyllis Pyzel. Invention is credited to Robert Pyzel.
United States Patent |
3,731,678 |
Pyzel |
May 8, 1973 |
SMOKE INHALATION PROTECTOR
Abstract
A respirator for removing or reducing the smoke and noxious
fumes content of air comprises an outer casing having a tubular
nozzle that extends through an opening formed in the top of the
casing downwardly a shirt distance into the upper end portion of
the casing. An inner conduit is disposed within the outer casing,
the upper end of the conduit being spaced a short distance away
from the lower end of the nozzle and the lower end of the conduit
coinciding with an opening formed in the bottom of the casing. A
funnel-shaped baffle is disposed within the casing so that the
lower inner end of the nozzle extends into the enlarged upper end
of the baffle coincides and so that the small bottom opening of the
baffle coincides with the open upper end of the inner conduit. A
filter retaining member is disposed in the casing between the
casing and the upper of the inner conduit. The lower end of the
outer casing and the filter retaining member are each formed with a
plurality of small air passage openings, and the space between the
outer casing and the inner conduit is filled with air distribution
means and an air purification material. When the user of the
respirator inhales through the nozzle of the device inhalation
valve means automatically open and exhalation valve means
automatically close so that air is drawn through the air passage
openings formed in the filter retaining member, and when the user
exhales the inhalation valve means automatically close and the
exhalation valve means automatically open so that moisture laden
air is expelled directly into the inner conduit and thence to the
atmosphere.
Inventors: |
Pyzel; Robert (New York,
NY) |
Assignee: |
Pyzel; Phyllis (New York,
NY)
|
Family
ID: |
22396794 |
Appl.
No.: |
05/121,447 |
Filed: |
March 5, 1971 |
Current U.S.
Class: |
128/202.26;
55/518; 96/132; 96/118; 55/420; 128/205.27 |
Current CPC
Class: |
A62B
23/02 (20130101) |
Current International
Class: |
A62B
23/02 (20060101); A62B 23/00 (20060101); A62b
007/10 (); A62b 023/00 () |
Field of
Search: |
;128/142.6,147,142,146.6
;55/387,419,420,518,DIG.33,DIG.35 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Other References
Dept. Of Interior, Bureau of Mines Tech. Paper No. 300. Washington,
G.P.O. 1923..
|
Primary Examiner: Gaudet; Richard A.
Assistant Examiner: Dunne; G. F.
Claims
I claim:
1. Disposable respirator for reducing the smoke, noxious fumes and
carbon monoxide content of air prior to inhalation which
comprises
an elongated outer casing having top and bottom closure portions
and a filter retaining member disposed within said outer casing a
short distance below said top closure portion, said closure
portions and said filter retaining member each being formed with a
generally axially aligned opening, the lower end of the outer
casing being formed with a plurality of circumferentially-spaced
air inlet openings and the filter retaining member being formed
with a plurality of circumferentially-spaced air outlet
openings,
an inner conduit disposed essentially concentrically within said
outer casing, the upper end of said conduit coinciding with the
opening formed in the filter retaining member and the lower end of
said conduit coinciding with the opening formed in the bottom
closure portion of the casing,
a funnel-shaped baffle member disposed within the outer casing
immediately above the filter retaining member, the relatively small
opening at the lower end of the baffle member coinciding with the
open upper end of the inner conduit,
a generally tubular mouthpiece extending through the opening formed
in the top closure portion of the casing and downwardly part way
into the enlarged open upper end of the funnel-shaped baffle
member,
air distributing means and air purification material disposed in
the space between the outer casing and the inner conduit,
inhalation check valve means associated with the air outlet
openings formed in the filter retaining member whereby the flow of
air downwardly through said air outlet openings into the space
between the outer casing and the inner conduit is prevented,
and
exhalation check valve means associated with the lower end of the
inner conduit whereby the flow of air upwardly into said inner
conduit is prevented.
2. The respirator according to claim 1 in which a layer of fibrous
material is disposed in the space between the outer casing and the
inner conduit adjacent the air inlet openings formed in the lower
end of the casing, a layer of said material is disposed in said
space adjacent the air outlet openings formed in the filter
retaining member, and a body of granular air purification material
disposed in said space between said layers of fibrous material.
3. The respirator according to claim 1 in which the air
purification material comprises a catalyst for the oxidation of
carbon monoxide to carbon dioxide at room temperature and an
adsorbent for organic vapors and acid gases.
4. The respirator according to claim 1 in which the air
purification material comprises a desiccant for removing moisture
from inhaled air, a catalyst for the oxidation of carbon monoxide
to carbon dioxide at room temperature and an adsorbent for organic
vapors and acid gases.
5. The respirator according to claim 4 in which the desiccant
comprises a layer of calcium chloride or silica gel disposed
between the air inlet openings of the device and the catalyst for
the carbon monoxide oxidation reaction.
6. The respirator according to claim 4 in which the adsorbent
material is activated carbon.
7. The respirator according to claim 1 in which the inhalation
check valve means comprises an annular disc of thin flexible sheet
material that overlies and cooperates with the air outlet openings
formed in the filter retaining member.
8. The respirator according to claim 7 in which the inner periphery
of the annular disc is held in close proximity to the inner
periphery of the filter retaining member by means of the lower end
portion of the funnel-shaped baffle.
9. The respirator according to claim 1 in which an extended
flexible tube is attached to the respirator at a point below the
exhalation check valve.
10. The respirator according to claim 1 in which the external
portion of the tubular mouthpiece is configured to be received
comfortably in the mouth of the user and to be gripped by the
user's teeth while the casing hangs downward from the mouth in a
substantially vertical position.
11. The respirator according to claim 1 in which the outer casing
comprises an elongated cylindrical tube having the inner tube
disposed concentrically therewithin.
12. The respirator according to claim 4 in which the outer casing
comprises an elongated cylindrical tube having the inner tube
disposed concentrically therewithin.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to respirators, and more particularly it
relates to a small mouth or hand-held respirator for removing or
substantially reducing smoke and noxious fumes from air before the
air is inhaled.
2. The Prior Art
Devices, usually referred to as respirators, for removing smoke and
noxious fumes from air before the air is inhaled are well known in
the art. In general, these devices comprise a cannister or other
container which contains a catalyst for converting carbon monoxide
to carbon dioxide, a filter for removing particulate matter (e.g.
sooty smoke particles) and an adsorbent material (e.g. activated
carbon) for removing organic vapors and acid gases from the air
being inhaled by the user of the device. For proper operation of
such devices it is necessary to provide valve means which cause the
air being inhaled to be drawn through the filter and adsorbent
materials and which prevent the air being exhaled from being
expelled through these materials. Furthermore, these devices are
commonly provided with mouthpieces, nose clips, goggles, face
masks, and/or flexible tubing connecting the face mask to the
cannister which together comprise a relatively bulky assembly that
is inconvenient to carry and that frequently requires special
training to properly don and use. Military gas masks and
firefighters smoke inhalation protectors are representative of this
type of prior art respirator device.
Fires in office buildings, houses, subway trains, tunnels and the
like are frequently very smokey and produce copious quantities of
carbon monoxide and other noxious air pollutants. Such smokey fires
claim hundreds of lives each year due to smoke poisoning,
unconsciousness and eventual suffocation which lives might have
been saved had the victims been wearing or using a respirator which
removes or substantially reduces smoke particles and noxious fumes
from the air before being inhaled. Conventional gas masks and smoke
inhalator protectors which would serve the purpose are too bulky
and inconvenient for the average person to carry with him in the
unlikely event that he might be caught in an emergency that,
statistically speaking, rarely occurs. Moreover, it would be
impractical and unrealistic to have respirators of conventional
design stored in accessible receptacles in office buildings, subway
trains and other such places in sufficient numbers to provide
protection for all those who might be present during the
statistically unlikely event of a smokey fire.
A person caught in a smokey fire emergency can usually escape form
the scene by way of a fire stairwell or elevator or tunnel
relatively quickly if he can avoid being overcome by smoke in the
meantime. The time required to escape from the scene, in the
absence of smoke and noxious fumes, is usually only few minutes,
and rarely more than 20, or perhaps 30, minutes. Therefore, an
emergency smoke inhalation protective device need only have an
effective service life of about one half an hour to serve the
intended purpose. Heretofore, however, the bulky size and
inconvenience of conventional respirators have made their wide use
for this purpose impossible.
As a result of an extensive investigation of the problem described,
I have developed a smoke inhalation protective device that is
simple and reliable in operation and yet is so small and free of
encumbrances that it may be carried about at all times in a pocket
or purse of the prospective user. Moreover the device may be kept
in a desk drawer at home or in the office, and it may easily be
stored in quantities of several dozen in comparatively small
receptacles mounted in elevators, fire escape wells, subway cars
and at other strategic locations. The compactness and efficiency of
the device is made possible by the development in recent years of
super-adsorbents for noxious gases. For example, there is available
today a super adsorbent known as "Hopcalite" which not only adsorbs
organic vapors and acid gases but also catalytically causes carbon
monoxide to be oxidized to harmless carbon dioxide at ambient
temperatures, and which has an air purifying capacity relative to
its weight or volume much greater than ordinary activated charcoal.
The efficiency and effectiveness of these new super adsorbents
makes possible the use of smaller quantities of these materials and
therefore, at least theoretically, the creation of respirators of
small size. However the small size of the respirators it is now
theoretically possible to construct creates other problems with
respect to the design of a satisfactory respirator. Such problems
include the ease of breathing through the respirator, its valving
mechanism, and the manner of disposal of excessive moisture
contained in exhaled air which can blanket the purifying capacity
of the super-adsorbent material. The device of the present
invention provides an efficient, effective and reliable solution to
these problems.
SUMMARY OF THE INVENTION
The small emergency respirator device of my invention comprises an
outer casing having top and bottom closure portions and a filter
retaining member disposed within the outer casing a short distance
below the top closure portion. The top and bottom closure portion
and the filter retaining member are each formed with a generally
axially aligned opening. An inner conduit is disposed within the
outer casing, the upper end of the conduit coinciding with the
opening formed in the filter retaining member and the lower end of
the conduit coinciding with the opening formed in the bottom
closure portion of the casing. A funnel-shaped baffle member is
disposed within the outer casing immediately above the filter
retaining member, the relatively small opening at the lower end of
the baffle member coinciding with the upper end of the inner
conduit. A generally tubular nozzle or mouthpiece extends through
the opening formed in the top closure portions and downwardly part
way into the enlarged open upper end of the funnel shaped baffle
member. The lower end of the outer casing is formed with a
plurality of circumferentially-spaced air inlet openings and the
filter retaining member is formed with a plurality of
circumferentially-spaced air outlet openings.
Air distribution means, advantageously a layer of fibrous material,
is disposed in the space between the outer casing and inner conduit
adjacent the air inlet openings formed in the lower end of the
casing, and a layer of said fibrous material is disposed in said
annular space adjacent the air outlet openings formed in the filter
retaining member. The purpose of said fibrous layers is to evenly
distribute the air flow into the air purification material from the
air inlet openings, and out of the air purification material into
the air outlet openings, with a minimum of resistance to air flow
while at the same time assuring that the air will flow throughout
the entire cross section of the body of air purification
material.
A body of granular material, purification material, advantageously
a combined catalyst for the oxidation of carbon monoxide to carbon
dioxide and an adsorbent for organic vapors and acid gases, is
disposed in the annular space between said layers of fibrous
material.
The catalyst and adsorbent material, particularly when a material
such as "Hopcalite" is used, may be protected against any moisture
content of the inhaled air by placing a small amount of desiccant
material, such as anhydrous calcium chloride, at the bottom (that
is, air inlet end) of the body of catalyst and adsorbent material.
This is a precaution because the catalytic effect of this material
which causes the conversion of carbon monoxide to carbon dioxide is
adversely affected by moisture even in low concentrations.
Inhalation check valve means are associated with the air outlet
openings formed in the filter retaining member and exhalation check
valve means are associated with the opening at the lower end of the
inner conduit, said valve means may advantageously comprise
flapper-type check valves of resilient sheet material. As a result
of the aforedescribed construction, when the user inhales through
the nozzle or mouthpiece of the device the inhalation valve means
automatically opens and the exhalation valve means automatically
closes so that air is drawn in through the air inlet openings
formed in the outer casing, through the air purification materials
in the casing, through the air outlet openings formed in the filter
retaining member, by the funnel-shaped baffle and thence into the
mouthpiece. When the user of the device exhales through the nozzle
or mouthpiece, the inhalation valve means automatically closes and
the exhalation valve means automatically opens so that moisture
laden air is expelled directly into the inner conduit and thence to
the atmosphere.
It should be noted that the device need not necessarily attain
complete purification of the air being inhaled, its purpose being
to reduce the dangerous pollutants to a sufficiently low level to
enable the user to escape from the emergency area with reasonable
comfort and without serious harm. Also, when the device is intended
to be kept in desk drawers, or stored in boxes suitably located in
such places as stairwells, elevators, or subway cars, its
dimensions may be made somewhat larger, particularly with respect
to the diameter (cross sectional area) and length of the section
containing the absorbent materials, since this will, of course,
provide additional protection and in these locations the very
smallness of the device is not quite as crucial a consideration as
in the case where the device is specifically intended to be carried
in the user's purse or coat pocket.
BRIEF DESCRIPTION OF THE DRAWINGS
The respirator device of my invention will be better understood
from the following description in conjunction with the accompanying
drawings of which:
FIG. 1 is a side elevation partly in section of an advantageous
embodiment of the respirator of the invention showing the passage
of air therethrough when the user is inhaling through the
device;
FIG. 2 is a side elevation partly in section of the device shown in
FIG. 1 showing the passage of air therethrough when the user is
exhaling through the device;
FIG. 3 is a sectional view along line 3--3 of FIG. 2 showing an
advantageous form of inhalation valve means partly broken away;
FIG. 4 is a sectional view along line 4--4 of FIG. 1 showing an
advantageous form of exhalation valve means;
FIG. 5 is a plan view from below of the lower end of the device
shown in FIG. 1 and 2; and
FIG. 6 is a side elevation in section of the lower end of the
respiratory device showing an elaboration of the moisture-laden
exhaling discharge feature of the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As previously mentioned, the present invention provides a small,
effective and convenient to use smoke inhalation protective device
that is inexpensive to manufacture, convenient to carry or store
and that may be discarded after use. An important consideration in
the design of such a respirator device is the fact that during an
emergency situation people tend to breathe at an increased rate as
compared to normal breathing under relaxed circumstances. As a
result the respirator must be so designed that inhaling and
exhaling through the device can be easily accomplished at the
higher breathing rates without requiring undue suction during
inhaling or pressure during exhaling. If the device is not
specifically designed to provide for this relatively easy inhaling
and exhaling, the increased suction and pressure required is apt to
increase the feeling of alarm or panic which is always present
during emergency situations. Special attention must therefore be
paid to the arrangement of the valving mechanism (in this very
small device) to take maximum advantage of the limited space
available and thus obtain the minimum resistance to air flow
insofar as possible. Preferably the inhale-suction and
exhale-pressure should not be more than 4 inches of water
differential as measured by a water manometer, and in any event
should not exceed about 6 to 7 inches water differential.
The respirator device of the invention is preferably designed to be
inserted in the mouth of the user, simply held in place more or
less like a cigar or pipe. (In this connection it should be noted
that nature has provided man with a positive, almost automatically
applied, mechanism in the back of the nose that closes off the air
flow through the nose while breathing in and out through the mouth;
for example, the breathing action one automatically adopts when
swimming. When the device is so used, a particular problem presents
itself - namely, that when exhaling there is not only the usual
high moisture content of the exhaled breath, but considerable
amounts of saliva are inevitably discharged into the device as
well. The device must therefore be so designed as to provide for
constant, automatic discharge of the excessive liquid carried by
the exhaling breath, and this liquid should be discharged from, or
near, the bottom of the device to prevent it contacting either the
indrawn air which is being inhaled or the absorbent materials which
remove noxious fumes from this indrawn air. In actual experiments
under simulated emergency conditions I have found that when a
respirator device does not have adequate provisions for constant
drainage of considerable amounts of liquid, the whole device
becomes too wet, and as a result inoperative, in a matter of a few
minutes.
In accordance with the foregoing considerations and design
criteria, the preferred embodiment of the respirator of my
invention that is shown in FIGS. 1 and 2 of the drawings comprises
an outer casing 10 having a top closure portion 11 and a bottom
closure portion 12. The casing 10 is advantageously in the form of
an elongated tube having a circular cross section of at least about
1 inch in diameter, could be somewhat larger or smaller and could
have a rectangular or oblong cross section. The top closure portion
11 and the bottom closure portion 12 may be separate parts that are
adhesively secured to the top and bottom ends of the casing, or
they may be integrally formed with the casing 10 in which case the
casing is advantageously fabricated in two parts which are joined
together approximately along line 3--3 of FIG. 2. A filter
retaining member 13 is disposed in the casing 10 a short distance
(e.g., about one-half inch) below the top closure portion 11, the
top and bottom closure portions 11 and 12 and the filter retaining
member 13 each being formed with an axially aligned opening 11a,
12a, and 13a respectively. An inner conduit 14 is disposed axially
within the outer casing 10, the open upper end of the conduit 14
coinciding with the opening 13a formed in the filter retaining
member 13 and the open lower end of the conduit coinciding with the
opening 12a formed in the bottom closure portion 12. A cup or
funnel-shaped baffle 15 is disposed in the casing 10 within the
space between the top closure portion 11 and the filter retaining
member 13. The relatively small opening at the lower end of the
baffle 15 coincides with the open upper end of the inner conduit
14, the enlarged open upper end of the baffle 15 being spaced a
short distance (e.g., about one-eight inch) from the top closure
portion 11. A nozzle or mouthpiece 16 extends through the opening
11a in the top closure portion 11 downwardly a short distance into
the enlarged upper end of the baffle 15 as clearly shown in FIGS. 1
and 2 of the drawing. As noted, the baffle 15 is positioned a small
but sufficient distance below the top closure portion 11 and the
lower end of the nozzle 16 is spaced a small but sufficient
distance radially inwardly from the baffle 15 to provide free
passage for air being inhaled as indicated by the arrows in FIG. 1.
Moreover, the baffle 15 serves the essential function of guiding
moisture-laden air exhaled through the nozzle 16 directly into the
open upper end of the inner conduit 14 as indicated by the arrows
in FIG. 2.
The outer casing 10, top and bottom closure portions 11 and 12,
filter retaining member 13, inner conduit 14, baffle 15 and
mouthpiece 16 may be formed of any suitable material such as
plastics. As the respirator is intended to be discarded after use,
these parts are advantageously molded by injection molding
techniques from inexpensive thermoplastic molding resins.
The lower end of the casing 10 is formed with a plurality of
circumferentially spaced air inlet openings 18 as shown in FIGS. 1
and 2, and the filter retaining member 13 is formed with a
plurality of circumferentially spaced air outlet openings 19 as
shown best in fIG. 3. Air distribution means, advantageously a
layer 20 of a fibrous material, is disposed in the space between
the outer casing 10 and the inner conduit 14 adjacent the air inlet
openings 18, and another layer 21 of fibrous material is disposed
within this space adjacent the air outlet openings 19. The space
within the outer casing 10 between the layers 20 and 21 is filled
with granular air purification material 22. The fibrous material 20
and 21 serves to distribute the air uniformly and to retain the
granular air purification material 22 in place within the casing
10. The fibrous material must be sufficiently porous to permit air
to pass easily through the material. Suitable fibrous materials
include lambs wool or coarse or kinky synthetic fibers and the
like. Alternatively, the air distribution means may comprise an
open space maintained by a suitably placed screen. The air
purification material 22 serves to remove noxious fumes from the
air being inhaled. The air purification material is preferably in
the form of discrete granules which permit air to be drawn easily
through a body of the material and advantageously is one of the
newly developed super adsorbents which have markedly improved
adsorbent capacity as compared with older adsorbent materials.
Specifically I prefer to use one of the more recent versions of the
carbon monoxide oxidation catalyst and adsorbent material known
commercially as "Hopcalite" (a mixture of oxides of copper, cobalt,
manganese and silver on activated carbon or charcoal), used either
as such or in conjunction with other materials such as caustite,
super activated charcoal, etc. The lower portion 22a of the air
purification material, just above the air distributing section
containing lamb's wool or whatever or consisting of an open space
maintained by a screen, advantageously comprises a desiccant such
as calcium chloride or silica gel for moisture absorbtion while the
remainder, the larger portion, of the adsorbent material is
particularly suited to adsorb noxious gases and convert carbon
monoxide into carbon dioxide.
An inhalation check valve 23 is associated with the air outlet
openings 19 formed in the filter retaining member 13 and is
disposed immediately above these openings, and an exhalation check
valve 24 is associated with the open lower end of the inner conduit
14 and is disposed immediately below this opening. A protective
cover 25 for the exhalation check valve 24 is secured to the lower
end of the casing 10, the protective cover 25 being formed with a
plurality of air exhaust openings 26, through which the exhaling
air and its moisture content are discharged below the air inlet
openings 18, and are directed downward and away from the inlet
openings, in order to assure that the moisture content of the
inhaled air is discharged as low as possible under the
circumstances. The check valves 23 and 24 are advantageously of the
flapper type and are fabricated from thin sheet material that is
both pliant and resilient. Suitable materials include thin pliant
sheets of rubber, plastic, rubber or plastic coated fabric, or the
like. The inhalation check valve 23 is advantageously annular in
shape, the inner periphery of the valve being secured in contact
with the inner periphery of the filter retaining member 13
advantageously by means of the baffle 15. The exhalation valve 24
as shown has a generally oblong configuration one end of which is
secured to the bottom closure portion 12 by means of the rivet-like
fasteners 30, but various alternative arrangements are possible,
and may be more desirable depending on the assembling steps
employed in the manufacturing procedure used for quantity
production of the device.
The nozzle 16 may be designed for insertion into the user's
nostrils. However, in the preferred embodiment of the invention the
nozzle 16 is in the form of a curved mouthpiece that is inserted in
and held by the user's mouth. The tubular nozzle or mouthpiece 16
is advantageously provided with a soft rubber or plastic cover 28
which may be comfortably held in the user's mouth, or easily
gripped by the user's teeth.
In the event of an emergency the person using the device inhales
and exhales through the nozzle or mouthpiece 16. When the user
inhales the exhalation valve 24 automatically closes and the
inhalation valve 23 automatically opens, thereby causing air to be
drawn in through the air inlet openings 18 upwardly through the air
distributing and adsorbent materials. 20, 21 and 22, through the
air outlet openings 19, by the baffle 15, and thence upwardly
through the mouthpiece 16 as indicated by the arrows shown in FIG.
1. When the user exhales through the mouthpiece 16, the inhalation
valve 23 automatically closes and the exhalation valve 24
automatically opens, thereby causing the moisture-laden air being
exhaled to be expelled through the inner conduit 14 and the air
exhaust openings 26 directly into atmosphere as indicated by the
arrows shown in FIG. 2.
By positioning the inhale valve mechanism 23 within the main body
or casing 10 of the device (rather than in the nozzle 16), it is
possible to obtain the maximum air flow through the valve, the
valve openings being limited only by the cross sectional area of
the device. This is of extreme importance in keeping the suction
required for inhaling as low as possible. Moreover, the exhaling
path is a straight-through flow that does not require the exhaled
air (and its liquid contents) to flow around corners or through
awkwardly restricting passages. Thus, the exhaled air excounters a
minimum pressure and, with the aid of gravity, propels its liquid
contents directly out of the bottom of the device and away from the
air intake openings.
FIG. 6 shows an addition to the protective cover 25 which serves to
further insure that the moisture in the exhaling breath is
discharged from the device as far away from its air inlet openings
as is reasonably possible. In FIG. 6 the cover 25 is provided with
a funnel like extension 25a to which is attached an open ended sock
or flexible tube 31, held in place by a ring 32. The sock or
flexible tube may be folded together when the device is stored or
placed in a suitable air-tight container (to protect the adsorbsent
material against gradual deterioration due to moisture, etc. when
stored for long periods of time), thus taking up but little room,
while it will, of course, be automatically extended when the user
exhales through the device, thereby moving the moisture discharge
end of the sock or tube as far away from the air inlet openings 18
as the length of the sock or tube will permit.
* * * * *