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Патент USA US3090392

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May 21, 1963
F. J. FEGAN ETAL
3,090,382
OVERBED OXYGEN TENTS
Filed April 22, 1959
'
:5 Sheets-Sheet 1
IN VEN TORS.
_____________ _ .'
FRANK J. FEGAN
AND
By WILLIAM H. SMITH
WW
ATTORNEY
May 21, 1963
3,090,382
F. J. FEGAN ETAL
OVERBED OXYGEN TENTS
Filed April 22, 1959
3 Sheets-Sheet 2
INVENTORS.
FIG. 8
FRANK J. FEGAN
AND
BY
WILLIAM Hv SMITH
ATTORNEY
May 21, 1963
F. J. FEGAN ETAL
3,090,382
OVERBED OXYGEN TENTS
Filed April 22, 1959
3 Sheets-Sheet 3
/ / W/
//0
2
65
FIG. IO
TO COMPARTMENT c4
W
LINE
INVENTORS.
32
FRANK J, FEGAN
By
WILLIAM H. SMITH
ATTO RN EY
United States Patent 0 ” 1C6
1
3,899,382
Patented May 21, 1963
2
3,080,382
OVERBED OXYGEN TENTS
Frank .‘5'. Fegan and William H. Smith, Norwallr, C0nn.,
assignors, by mesne assignments, to Shampaine Indus
tries Inc, St. Louis, Mo., a corporation of Missouri
Filed Apr. 22, 1959, Ser. No. 808,134
5 Claims. (63. 128—191)
FIG. 8 is a side elevational View showing the oxygen
tent in operative position over a hospital bed;
FIG. 9 is a fragmentary sectional view taken along line
9--9 of FIG. 8;
FIG. 10' is a fragmentary rear elevational view of the
control panel forming a part of the present invention; and
FIG. 11 is a diagrammatic view showing the manner in
This invention relates in general to oxygen therapy
equipment and, more particularly, to a portable overbed
which the refrigeration system is connected to control
devices.
Referring now in more detail and by reference charac
oxygen tent.
ters to the drawings which illustrate a preferred embodi
ment of the present invention, A designates an oxygen
treatment device comprising a base 1 having a rear bar
of oxygen tents have a canopy or patient enclosure which
2 and a front bar 3 integrally connected in the formation
only extends around the patient’s chest and head, thereby 15 of a somewhat I-shaped frame by means of a center bar
At the present time, oxygen tents are usually cumber
some and di?icult to set up in a sick-room. Many types
creating severe problems of marginal sealing. The sides
4. Swivelly mounted in the four extremities of the base
1 are casters 5. ‘Formed integrally with and projecting
upwardly from the rear bar 2 in line with the center bar
be drawn down too tightly, otherwise, the patient would
4 is a socket 6 and rigidly secured therein is a Vertical post
soon become extremely uncomfortable. Such tents, con 20 or column 7 which is provided at its upper end with a
sequently, “leak” excessively, thereby using large amounts
?xed horizontal bracket 8 supporting a ?at horizontal
of oxygen and being rather di?icult to control in terms of
bottom wall 9' having an upstanding peripheral ?ange 10.
maintaining a stable oxygen concentration. Of course,
Mounted upon the bottom wall 9' is a housing 11 consist
some leakage is necessary to avoid undue build-up of car
ing of side walls 12, 13, a rear wall 14, a front wall 15
bon-dioxide concentration, but even in a tent of relatively 25 and a top wall 16. The housing 11 is interiorly subdi
small proportions this leakage should not be great.
vided by a heavy heat-insulated partition 17, into a for
and top can be tucked in around the mattress but the bot
tom edge, which lies across the patient’s chest, cannot
Comparable problems exist in reference to humidity
control. Present day concepts of oxygen-therapy call for
rather precise humidity control and such control cannot be
ward compartment or chamber a1 and a rear compart
ment or chamber c2. Mounted within the rear chamber
same connection, the fact that the lower portion of the
patient’s body is outside of the oxygen tent subjects the
patient to diverse temperature and humidity conditions
c2 upon vibration-absorbing rubber pads 17 ' in upwardly
spaced relation to the bottom wall 9' is a base-plate 18,
the latter being relatively heavy and strong so as to func
tion for the mechanical elements disposed within the cham
ber c2. In that portion of the area which extends across
the compartment 02 both side walls 12, 13, are provided
which induce physical discomfort as well as contributing to
with louvered ventilation openings 19', 20, respectively,
the dif?culty of maintaining a controlled atmosphere with
and mounted upon the base-plate 18 interiorly of and ex
tending across the ventilation opening 20 is a condenser
efficiently maintained in an oxygen tent which has an ex
cessive or even substantial amount of leakage.
In this
in the tent.
It is, therefore, one of the principal objects of the pres
coil 21, the interiorly presented face of which is hooded
within ‘an air-ducting shield 22 for peripherally enclosing
ent invention to provide a portable oxygen tent which is
unusually compact and can be quickly set-up over a sick— 40 a fan blade 23 which is pinned or otherwise rigidly
bed in a very simple manner.
mounted upon the end of a motor shaft 24 which is, in
turn, part of an electric fan-motor 25, the latter being
It is another object of the present invention to provide a
portable oxygen tent having highly e?icient, self-contained
suitably mounted upon the base-plate 18 by means of a
supporting bracket 26, so that the fan will rotate concen
It is a further object of the present invention to provide 45 trically within the shield 22 and produce a draft of air
crosswise through the compartment c2 for cooling the
a portable oxygen tent having precise temperature-control
condenser 21.
and humidity-control means.
Also mounted upon the base-plate 18 is an hermetically
It is also an object of the present invention to provide
sealed self-contained refrigerant compressor 27. This
a portable oxygen tent which can be set-up at the foot-end
of a sick bed so as to occupy relatively little ?oor space 50 compressor is of any conventional design or construction
and present minimum interference with access to the pa
and, therefore, is not speci?cally shown or described in
tient for nursing care.
detail herein. It is su?icient to point out that the com
pressor 27 is driven by an internal electric motor (not
It is an additional object of the present invention to pro
shown) having conventional electrical connection wires
vide an oxygen tent of the type stated which can envelope
the entire area over the sick bed, thereby enclosing a rela 55 28, 29, extending through and hermetically sealed in the
casing of the compressor 27, as is usual practice. Also
tively large space and, to a large extent, alleviating the
dehumidi?cation means.
patient’s feeling of claustrophobia.
extending through and hermetically sealed in the casing of
the compressor 27 are a refrigerant high pressure line 30
With the above and other objects in view, my invention
and a refrigerant return line 31. The refrigerant high
resides in the novel features of form, construction, ar
rangement, and combination of parts presently described 60 pressure line 30 is directly connected to an auxiliary con
denser-coil 32 which is soldered or otherwise attached in
and pointed out in the claims.
heat-transfer relationship upon the bottom side of a shal
In the accompanying drawings—
low pan 33 having relatively large areas and being suit
FIG. 1 is a side elevational view of the oxygen tent con
ably mounted between the bottom wall 9 and the base
structed in accordance with and embodying the present
invention;
FIG. 2 is a front elevational view of the oxygen tent;
FIG. 3 is a rear elevational view of the oxygen tent;
FIG. 4 is a fragmentary sectional view taken along line
65 plate 18, in more or less symmetrical location beneath a
relatively large ventilation opening 34 for-med in the base
plate 18, all for purposes presently more fully appearing
and as best seen in FIGS. 4 and 5.
Disposed within the lower portion of the forward com
4—4 of FIG. 3;
70 partment c1 and extending transversely thereacross is an
FIGS. 5, 6, and 7, are sectional views taken along lines
air cooling chamber c3 having horizontally disposed top
5—5, 6—6, and 7-7, respectively, of FIG. 4;
and bottom walls 35, 36, respectively, and an intermedi
8,090,382
3
ate horizontal Wall 37. ' The chamber 03 also includes two
relatively narrow side walls 38, 39, which are connected
at their rearward margins to rearwardly and inwardly
converging vertical back walls as, 41. The latter extend
inwardly toward the central portion of the compartment
A
posed in the refrigerant-line 51 is a solenoid valve 6'5
which is electrically connected by means of wires 66',
67, to the thermos-tat 63 for operation in response to con
trol by the thermostat 63. The solenoid valve 65 is also
connected by a refrigerant-line 68 to the inlet side of the
evaporator coil 50 and by a refrigerant~line 69 to the dis
charge side of the evaporator coil 59. Finally, the sole
noid valve 65 is connected to the refrigerant return line
31. The solenoid valve 65 is conventionally constructed
01 and are connected with a vertically disposed semi
cylindrical wall-element 42. It should be noted in this
connection that the walls 40, 41, and the wall-element 42
are securely connected to the rearwardly presented edges
of the horizontal Walls 35, 36, 37, and it should also be 10 so that in one position it will establish connection between
the line 51, 68, and the lines ~69, 31, whereby refriger
pointed. out that all of the walls of the chamber c3 are
ant under pressure will ?ow directly to the evaporator coil
preferably formed of heat insulating material or should
59 and thence through the line-6h and the return line back
be well insulated against heat-transmission. The inter
to the compressor. When, however, the temperature in
mediate wall 37 divides the chambers 63 into an upper
‘compartment or chamber at and a lower compartment 15 the compartment c4 drops to the lower limit of control for
which the thermostat s3 is set, the thermostat will on
or chamber as, these compartments being in communica
ergize the solenoid valve 65 causing it to change its posi
tion through an opening 43. Suitably mounted in the
tion and establish connection between the line 51 and the
front'wall 15 of the housing 11 for communication to the
return line 33 so that the high pressure refrigerant from
chamber c4 is a louvered grill work 44 and similarly
the condenser 21 will ?ow directly to the return line and
mounted in the front wall 15 of the housing 11 for com
the evaporator coil 56 will thereby be lay-passed. By this
munication with the lower chamber c5 is a louvered grill
means the compressor is maintained in continuous oper
work 45. Mounted, by means of a bracket 46, upon the
ation.
wall 35 of the chamber c1 is .an electric fan-motor 47
Rigidly mounted upon the upper face of the top wall
having an vertical shaft 48 which extends rotatably
through the wall 35 and is provided with a centrifugal 25 16 of the housing 11 is a ?ange socket ‘ill for removably
receiving the lower end of a tubular arm 71 held therein
blower element 49‘ which will draw air through the grill
work 45 and the lower chamber c5 upwardly through the
opening 43 and discharge it outwardly through the cham
ber c4 and the grill work 44.
Suitably mounted within the lower chamber c5 and 30
extending angularly from the lower rear corner thereof
upwardly toward the intermediate wall 37 is a conven
tional evaporator coil 5i? which is operatively connected
by means of a refrigerant-line 51 to the discharge side
of the condenser 21. The intake side of the condenser
21 is, in turn, connected by a refrigerant-line 52 to the
discharge side of the auxiliary condenser 32. It should
be noted in this connection that the evaporator coil 59
may incorporate a capillary tube or any other conven
by means of a set screw 72.
The arm 71 extends angu
larly upwardly and outwardly from the housing 11, over
the hospital bed B and is provided at spaced intervals
along its length with rings 73 for supported engagement
with depending hanger-members 74 which integrally in
clude laterally projecting arms 75 formed, at their outer
ends, with hooks 76 for engagement with eye-members
77 secured in the upper portion of an oxygen tent T. The
oxygen tent T is fabricated from a relatively thin sheet of
?exible transparent material such as plio?lm, for ex
ample, and is suitably apertured in its forward wall for
snug-?tting disposition around the forward end of the
housing 11, being suitably held within an annular clamp
tional expansion means by which the condensed refriger 40 ing ring 78. The lower margins of the tent T are tucked
in around the periphery of the mattress substantially as
ant can be fediinto the evaporator coil so for the pro
duction of a cooling e?ect therein. The capillary tube or
shown in FIG. 8 so that the space over and around the
other refrigerant-control means is entirely conventional
and is, therefore, not shown or described in detail here
bed B is, in eiiect, enclosed or compartmentalized and the
atmosphere therein can be controlled by the atmosphere
regulating unit A. In other words, the air enclosed within
the tent T is drawn in through the grill work 45, cooled
and dehumidi?ed by passage over the evaporator coil 50,
and thence returned to the interior of the tent T through
the grill work 44. As the air passes through the cham
in.
Mounted upon the wall 36 and extending interiorly
across the bottom of compartment 05 beneath the lower
end of the coil 50 is a condensate catch-trough 53 which
drains into a short rearwardly and downwardly inclined
tube 54 extending through the wall element 42 and the
partition 17 for discharge into the pan 33. Thus, the
water removed from the air as condensate by the coil 5i}
will trickle down over the surfaces of the coil 50 into the
catch-trough 53 and thence ?ow through the tube 54
into the pan 33 from which it is evaporated by means
of the heat in the auxiliary condenser coil 32.
This
moisture which is evaporated from the pan 33 is drawn
ber 04, after having been cooled and dehumidi?ed, it is
suitably charged with a controlled amount of oxygen in
gas according to the needs of the patient.
It should be understood that changes and modi?cations
in the form, construction, arrangement, and combination
of the several parts of the overbed oxygen tents may be
made and substituted for those herein shown and de
scribed without departing from the nature and principle
of our invention.
upwardly through the opening 34 into the current of air
flowing through the compartment 02 and is thereby dis
Having thus described our invention, what we claim
charged to the atmosphere.
60 and desire to secure by Letters Patent is:
Mounted in the rear wall 14 of the housing 11 is a
control box 55 having a rearwardly exposed and acces
sible instrument, panel 56. The control box 55 contains
a conventional on-oft switch 57, a manually adjustable
control valve 58, an outwardly projecting nipple 59 for 65
connection to an oxygen supply tank (not shown), a tem
perature gauge or thermometer 6i), and a manually ad
iustable thermostat control knob 61.
As shown in FIG. 11 the oxygen valve 58 can be set
1. An oxygen treatment device for use with a hospital
bed; said oxygen treatment device comprising a base, a
vertical post mounted on and projecting upwardly from
the base, a bracket carried by the post, a chassis mounted
on the bracket and being internally subdivided into a plu
rality of compartments, a refrigerant compressor mounted
on the chassis and being located in the ?rst of said plu~
rality of compartments, a condenser mounted on the
chassis and being located in the ?rst of said plurality of
to control the flow of oxygen through the conduit 62 into 70 compartments, an evaporator coil mounted on the chassis
the compartment 04 where it is mixed with the flow of
and being located in the second of said plurality of com
air passing therethrough. Similarly, the thermostat 63
partments, an auxiliary condenser mounted on the chassis
has a conventional sensory tube 64 which extends into the
and being located in the ?rst of said plurality of com
chamber 04 so that the thermostat will respond to the tem
partments, said compressor, condenser, auxiliary con
perature of air passing through such chamber 04. Inter 75 denser, and evaporator being operatively connected in
5
3,090,382
series to form a refrigeration system, means for auto
matically disengaging said evaporator from said refriger
ation system when the temperature of said oxygen treat
ment device reaches a certain minimum value, means on
the chassis and disposed around the evaporator forming
the third of said compartments and being divided into
fourth and ?fth compartments, said fourth and ?fth com
partments having outlet and inlet openings, respectively,
a blower operatively mounted in the third compartment
for circulating air from the inlet opening to the outlet
opening and across the evaporator coil, means for sup
plying oxygen to the chamber for admixture with the
air ?owing therethrough, upper support means carried
by the chassis and extending upwardly therefrom and out
6
said evaporator from said refrigeration system when the _
temperature of said oxygen treatment device reaches a
certain minimum value, means on the chassis and dis
posed around the evaporator forming the third of said
compartments and being divided into fourth and ?fth
compartments, said fourth and ?fth compartments hav
ing outlet and inlet openings, respectively, a blower oper
atively mounted in the third compartment for circulating
air from the inlet opening to the outlet opening and
across the evaporator coil, means for supplying oxygen
to the chamber for admixture with the air ?owing there
through, means for controlling the in?ux of oxygen to
said chamber, upper support means carried by the chassis
and extending upwardly therefrom and outwardly over
wardly over the bed, and tent-forming means carried by 15 the bed, and tent-forming means carried by the upper
the upper support means for enveloping a substantial
space over the bed, said tent-forming means having an
support means for enveloping a substantial space' over
the lbed, said tent-forming means having an opening dis
opening disposed adjacent to said chassis, a portion of
posed adjacent to said chassis, a portion of the chassis
the chassis extending into the space over the bed through
extending into the space over the bed through said open
said opening for placing such enclosed space in com 20 ing for placing such enclosed space in communication
munication with the inlet and outlet openings so that the
with the inlet and outlet openings so that the atmosphere
atmosphere within such space can be controlled by the
within such space can be controlled by the refrigeration
refrigeration system.
system.
2. An oxygen treatment device for use with a hospital
4. An oxygen treatment device for use with a hospital
bed; said oxygen treatment device comprising a base, a 25 bed; said oxygen treatment device comprising a base, a
vertical post mounted on and projecting upwardly from
vertical post mounted on and projecting upwardly from
the base, a bracket carried by the post, a chassis mounted
the base, a bracket carried by the post, a chassis mounted
on the bracket and being internally subdivided into a plu
on the bracket, and being internally subdivided into a
rality of compartments, a refrigerant compressor mounted
plurality of compartments, a refrigerant compressor
on the chassis and being located in the ?rst of said plu
mounted on the chasssis and being located in the ?rst of
rality of compartments, a condenser mounted on the
said plurality of compartments, a condenser mounted on
chassis and being located in the ?rst of said plurality of
the chassis and being located in the ?rst of said plurality
compartments, an evaporator coil mounted on the chassis
of compartments, an evaporator coil mounted on the
and being located in the second of said plurality of com
chassis and being located in the second of said plurality
partments, an auxiliary condenser mounted on the chassis
of compartments, said compressor, condenser, and evapo
and being located in the ?rst of said plurality of compart
rator being operatively connected in series to form a
ments, said compressor, condenser, auxiliary condenser,
and evaporator being operatively connected in series to
form a refrigeration system, means for automatically dis
refrigeration system, means for automatically disengaging
said evaporator from said refrigeration system Iwhen the
temperature of said oxygen treatment device reaches a
engaging said evaporator from said refrigeration system 40 certain minimum value, means on the chassis and disposed
when the temperature of said oxygen treatment device
reaches a certain minimum value, means on the chassis
and disposed around the evaporator forming the third
of said compartments and being divided into fourth and
?fth compartments, said fourth and ?fth Icompartments
having outlet and inlet openings, respectively, a blower
operatively mounted in the third compartment for circu:
lating air from the inlet opening to the outlet opening and
across the evaporator coil, means for supplying oxygen
to the chamber for admixture with the air ?owing there
through, upper support means carried by the chassis and
extending upwardly therefrom and outwardly over the
bed, and tent-forming means carried by the upper support
around the evaporator forming the third of said compart
ments and |being divided into fourth and ?fth compart
ments, said fourth and fifth compartments having outlet
and inlet openings, respectively, a blower operatively
mounted in the third compartment for circulating air
from the inlet opening to the outlet opening and across
the evaporator coil, a diathermanous partition separating
the chamber from the compressor and condenser, means
for supplying oxygen to the chamber for admixture with
the air ?owing therethrough, upper support means carried
by the chassis and extending upwardly therefrom and
outwardly over the bed, and tent-forming means carried
by the upper support means for enveloping a substantial
space
over the bed, said tent-forming means having an
said tent-forming means having an opening disposed ad 55 opening disposed adjacent to said chassis, a portion of
jacent to said chassis, a portion of the chassis extending
the chassis extending into the space over the bed through
means for enveloping a substantial space over the bed,
into the space over the bed through said opening for plac
said opening for placing such enclosed space in com
ing such enclosed space in communication with the inlet
munication with the inlet and outlet openings so that the
and outlet openings so that the atmosphere within such
atmosphere within such space can be controlled by the
60 refrigeration system.
space can be controlled by the refrigeration system.
3. An oxygen treatment device for use with a hospital
5. An oxygen treatment device for use with a hospital
bed; said oxygen treatment device comprising a base, a
bed; said oxygen treatment device comprising a base, a
vertical post mounted on and projecting upwardly from
vertical post mounted on and projecting upwardly from
the base, a bracket carried by the post, a chassis mounted
said base, a bracket carried by the post, a housing
on the bracket and being internally subdivided into a plu 65 mounted on said bracket, said housing being subdivided
rality of compartments, a refrigerant compressor mounted
into ?rst, second, and third internal compartments, said
on the chassis and being located in the ?rst of said plu
third compartment being subdivided into fourth and ?fth
rality of compartments, a condenser mounted on the
compartments, the second of said internal compartments
chassis and being located in the ?rst of said plurality
being disposed rearwardly of said ?rst, third, fourth, and
70
of compartments, an evaporator coil mounted on the
chassis and being located in the second of said plurality
of compartments, said compressor, condenser, and evapo
rator being operatively connected in series to form a re
?fth compartments, said ?rst compartment being disposed
above said third compartment, said ?fth compartment
being disposed beneath said fourth compartment, a re
frigerant compressor mounted within said second com
frigeration system, means for automatically disengaging 75 partment, a condenser mounted within said second com
3,090,382
t5
7
partment, an evaporator coil mounted Within said ?fth
compartment, means operatively connecting said com
vvpressor, condenser and evaporator coil in series to form
a refrigeration system, means for automatically disengag
ing said evaporator'coil‘from said refrigeration system
when the temperature of said oxygen treatment device
reaches a certain minimum value, upper support means
carried by the housing and extending outwardly over the
bed, tent-forming means carried by the upper support
means for enveloping a substantial space over the bed, 1°
said tent-forming means having an opening disposed ad
jacent to said housing, a portion of the housing extending
through the opening and into the space over the bed, air
inlet means mounted Within said ?fth compartment and
communicating with the space over the bed, air outlet 15
means mounted ‘within said fourth compartment and com
municating with the space over the bed, a blower oper
atively mounted within the third compartment for cir
culating air from the inlet means to the outlet means and
across the evaporator coil, and means for supplying oxy
gen to the third compartment for admixture with the air
?owing therethrough, so that the atmosphere within the
space over the bed can be controlled by the refrigeration
system.
References titted in the ?le of this patent
UNITED STATES PATENTS
2,190,613
2,220,447
2,315,222
Sittier _______________ __ Feb. 13, 1940
Hartman _____________ __ Nov. 5, 1940
Philipp ______________ __ Mar. 30, 1943
2,603,214
2,702,546
2,741,100
2,852,022
Taylor ______________ __ July 15, 1952
Gilroy ______________ __ Feb. 22, 1955
Young ______________ __ Apr. 10, 1956
Metteland __________ __ Sept. 16, 1958
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