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Патент USA US2112270

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March 29, 1938.
Filed April 27, 1934
2 Sheets-Sheet 1
March 29, 1938.
2,1 12,270
Filed April 27, 1934
2 Sheets-Sheet 2
Patented Mar. Z9,l 1938 ` ’
Harvey S. Cover, South Bend, Ind.
Application April 27, 1934, Serial No. 722,619
4 Claims. (Cl. 128-1-16)
joined together by similarly formed upper and
My invention relates broadly to respirators and
lower faces I3. The entire body portion I0 in
cluding side faces II and I2 and upper and lower
faces I3 is preferably moulded into one piece of
ñexible and resilient rubber so that the side walls 5
may fold against each other when not in use in
order to occupy a minimum amount of space and
-be'adapted to be carried in a pocket. Upper and
lower faces I3 are provided with identical cut
outs I4. The function of cut-outs I4 is to per
mit the entrance of and ñt tightly around the
bridge of the user’s nose. Since the cut-outs
are identical the device may be rotated throughv,
has for an objectV` the provision of such a device
having a novel type exhaust valve and a novel
construction of the respirator body for the pur
5 pose of attaching and securing the exhaust valve
thereto. This invention is. broadly related to -my
copending applications, Serial Nos. > 662,929,
684,503, and 684,968, filed respectively on March
2'?, 1933, August 10, 1933, and August 14. 1933.
Another object is the provision of a respirator
and means for protecting the exhaust valve from
damage and also protecting it to a high degree
from the entrance of foreign `particles which
might interfere with the proper working of the
substantially one hundred yeighty degrees and yet‘
fît the wearer’s face efficiently in one position as
exhaust valve parts.> - It might be thought that
well as the other.
the accomplishment of these objects would be ac-y
companied by certain disadvantages such asin
accessibílity, difficulty of removal, the necessity
‘Forwardly inclined lugs I5’are arranged on
upper and lower faces I3 for the purpose of
anchoring face contact member I6 which is shown
in Fig. 3 before attachment to the respirator.
Face contact member I6 is generally frusto
conical in shape and knitted into a continuous
of a vision obstructing housing, et cetera; how
ever, the exhaust valve retainingmeans of. my
respirator are placed in an accessible location,
the vexhaust valve may be easily removed for
elongated band.
cleaning, adjustment, or replacement, and the
Attaching loops I1 are provided .
at points one hundred eighty degrees apart, ad
protecting housing for the exhaust valve may bev _ jacent the larger end of member I6. The member ~
so positioned and arranged as not to interfere to
I6 may then be attached to the respirator by in
any‘detrimental extent with the'vision, of the
serting the smaller end into the open- or rear end
of the respirator and turning the larger end out- ~ «
Other objects of the invention are economy of
manufacture, economy of replacement, of parts,
compactness, and efllciency.
wardly and over the rear edges of side faces II
and I2 and upper and lower faces I3. When this
operation is completed so that the member I6
Other objects will- appear` hereinafter. »
covers entirely said rear edges the attaching loops ,
My invention may be best understood by refer- 4 I1 may be' hooked onto the forwardly inclined
ence- to the accompanying drawings, ln whichz.
Figi 1 is a top plan view of my device;
Fig. 2 is a side elevational view of the device;
securing lugs I5.
Supporting straps I8 land .I9 may be secured
to opposite side faces II and l2 respectively at
f Fig. 3 is a perspective view of the face contactv points adjacent but forwardly of the rear edges
member which maybe employed in conjunction of said side faces. Attaching bolts 20 may be
with my device; 3
used for this purpose and because of the position
Fig. 4 is a sectional view taken substantially on ing of said bolts they do «not interfere with the
the line l-I of Fig. 2;
outward and forward folding of face contact
Fig. 5 is a sectional view taken substantially ‘ member I6 to any detrimental extent. A secur
on the line 5--5 of Fig. 2;
' ¿
Fig. 6 is a sectional view taken substantially
on the line-6_6 of Fig. 1;
Fig. 7 is a sectional view taken substantially
on the line 1-1 of Fig. 2;
Fig. 8 is a detail view in section of a modiñed
form of exhaust valve and respirator parts for
attaching the valve to the respirator; and
Fig. 9 is a sectional viewßtaken substantially
on the line 9-9 of,l Fig. 8.
, Referring now'to Figs. 1 and 2, the preferred
form`of my device comprises a unitary wedge-`
shaped main body Ill having oppositely inclined
andconverging side faces II and~ |.2 which are
ing buckle 2l is carried by strap I8 and cooperates
with the free end of strap I9. Straps I8 and I9 _
are of course of sufficient length to extend around
the head of the user` so as to attach the respira
tor securely in place for ñltering the inhaled
Oppositely inclined side faces II and I2 are
provided with inhaling apertures 22 and 23. Pref
erably these apertures are of large size and ar-"
ranged in a circular formation with’one aperture
serving as the imaginary axis of the circular for
mation. Extending entireley around the groups
of apertures 22 and 23 are outwardly extending
2,112,270 -
annular flanges 24 and 25 respectively, and a
plurality of transversely extending 'attaching
bosses 26 and 21 protrude at spaced points from
the outer faces of flanges 24 and 25 respectively.
Preferably the flanges 24 and 25 are formed `integrally with the side faces II and I2 respectively
and of the same character of material. However,
Àthe flanges 24 and 25 may be made of greater
thickness than the side faces so as to make them
10 relatively more stiff and less subject to deforma
tion. Filtering material 28 is arranged over aper
tures 22 and 23 and within the flanges 24 and 25.
VScreens 29 may be placed over the outer ends of’
-said flanges so as to hold filtering material 28 in
place. Caps 30 having enlarged annular open
ings 3I may be placed over screens 29 and flanges
24 and 25 and attached to said flanges by the
entrance of attaching 'bosses or lugs 26 and 21
into the slots 32 which are carried in the cy
20 lindrical faces of caps 30. Caps 30 are preferably
attached by compressing ñanges 24 and 25 so that
the attaching lugs 26 and 21 may be brought
within the cylindrical walls of caps 30 and when
the lugs 26 and 21 are in alignment with slots 32
the resilience of the flange material causes the
attaching lugs to be projected outwardly and
through the slots 32. The caps may be removed
lâ' pressing the lugs-inwardly and through slots
The faces I I and I2 and upper and lower faces
I3 extend forwardly and into a Wall forming a
this point and an air-tight connection results.
An exhaust valve disc or flap is secured to the
forward face of base plate 39 by a pair of spaced '
pins 42. 'I‘he disc or flap 4I is preferably made
from a thin sheet of extremely flexible and re
silient rubber material and is of sufñcient size to
cover, entirely, openings 40. The pins 42 are
preferably placed intermediate the openings 40
and act as a hinge upon which opposite ends of
flap 4I virtually pivot when air is exhaled from 10
the respirator. Because of the flexibility and
resilience of the flap 4I the opposite ends thereof
immediately return to lie flat upon the forward
face of base plate 39 when pressure within the
respirator is reduced to that existing outside the
respirator. As soon as inhalation starts the flap
4I is drawn tightly against the plate 39 because ’
of the inward suction or pressure. The pins 42
are spaced apart so as to prevent the rotation
of ñap 4I since rotation might cause the outer 20
edges of the flap to drag on the inner wall of'
flange 38 and prevent eiiicient operation of the
However, a pin having a square shank or
transversely protruding lugs might be employed
instead of the two spaced pins.
A modi?ed form of exhaust valve is shown in
- Figs. 8 and 9 and would be adaptable for use with
a respirator having a bulbous extension which is
circular in cross-section so that the bead 43 and
spaced lugs 44 would provide an annular groove 30
the retention of annular exhaust valve frame
bulbous extension 33. The bulbous extension 33 v for
45. The base plate 46 in such a construction
is preferably longer from top to bottom than, would
of course be circular as would the flange
’from side to side so as to offer very slight obstruc-- 41. Exhaust
openings 48 might then be arranged
tion to the vision of the user. Annular openings
34 are provided at the top and bottom of bulbous
extension 33 for the purpose of permitting the
exit ,of exhaled air and so placed as to permit
drainage of Water of condensation from the inte
40 rior bulbous chamber. Referring now to Figs. 6
and 7, the interior wall of the bulbous extension
33 is thickened so as to provide an abutting and
retaining bead 35 whose function is to serve as
van abutment against which the exhaust valve
45 _carrying frame 36 is adapted to be held. Retain
ing lugs `31 are spaced forwardly of bead 35 on
the interior wall ofbulbous extension 33 and are
preferably arranged on opposite walls of said ex
tension. 'I'he bead 35 and lugs 31 thus in effect
provide a retaining groove in which the exhaust
valve frame 36 is constrictively held because the
space between the forward edge of bead 35 and
l the rearward edge of lugs 31 is somewhat less
the width of flange 38 of exhaust valve frame
3 .
Referring now to Figs. 4 and 5, the exhaust
valve frame 36 heretofore mentioned comprises a
somewhat ovally shaped base plate 39 and the
forwardly extending flange 38 heretofore men
60 tioned. Spaced exhaust openings 40 are placed
adjacent opposite ends of plate'39 and because
of the positioning of valve frame 36 are adjacent
the upper and lower walls of bulbous extension 33.v
Consequently they are near annular openings 34
around the attaching pin 49 as an axis and the
flap or disc 56 could be held in place by pin 49
and rotate freely on said pin without danger of
dragging upon the inner wall of flange 41. I
prefer the form` illustrated in Figs. 1, et cetera,
to the form shown in Figs. 8 and 9 because there
is less obstruction to the vision when those forms 40
of exhaust valves and bulbous extensions are
The removal of the exhaust valve frames from
`the bulbous extensions is a relatively simple
operation and may preferably be carried out by 45
deforming the bulbous extension until one of the
retaining lugs-31 (or 44 in the modified form) is
displaced so that one side of ' the exhaust valve
frame may be pushed forwardly. 'I'he entire valve
frame may then be withdrawn from the rear of 50
the respirator by turning said Vframe upon its
edge. The valve frame may be reinserted by
-pushing it into the bulbous extension edgewise,
pressing one side of the frame into the retain
ing groove, and then deforming the wall of the 55
bulbousy extension sufficiently to permit the other
side of the valve frame to be forced into the
retaining groove.
From the foregoing description it can be seen
that I have accomplished my objects in an ex
tremely economical manner and provided a de
vice which may be used for the intended pur
pose of filtering inhaled air without any great
discomfort to the user. The latter feature is
and moisture of condensation may find exit from
the interior of the respirator through openings
49 and openings 34. These openings function in , aided by the use'of two incoming filter chambers
identically the same manner regardless of whether
the respirator is used in the position in which it is and easily operated exhaust valve. The placing
70 shown in Fig. 2 or whether it is rotated through o'f the exhaust valve immediately forwardly of
one hundred eighty degrees. The outer perimeter the nostrils and mouth of the user aids consid 70
of ñange 381s somewhat greater than the inner erably in permitting the user to breathe lightly
perimeter of the wall of bulbous extension 33 and freely and yetbe protected from the dan
gerous effects" of noxious gases and foreign par
which lies between lug 31 and bead 35. Conse
75 quently the flange is constrictivelyretained at
While I have illustrated and described the pre 75
ierred form of construction for carrying my in
vention into effect, this is capable of variation
and modification without departing. from the
spirit of the invention. I, therefore, do not wish
to be limited to the precise details of construc
tion set forth, but desire to avail myself of such
variations and modifications as come within the
scope of the appended claims.
Having thus described my invention, what I
10 claim as new and desire to secure »by Letters Pat
e‘nt is:
1. A respirator comprising a forwardly tapered _
main body portion formed of flexible material
and a bulbous chamber formed integrally there
-15 with at its forward end, there being a constricted
passageway formed between the body portion
and. said chamber, the flexible walls of the
bulbous chamber adjacent said passage being
formed to provide a valve frame seat, a valve
20 fram'e and valve, and means for retaining said
valve frame on'said seat, said valve frame and
valve being removable by flexing the'walis of
the chamber and passing the valve frame and
valve through- said constricted passageway, 'sub
stantially as described.
2. A respirator comprisingl a pair of forwardly
tapered flexible side walls connected at their
longitudinal edges forming a larger open rear end
for engaging over the breathing openings of the
30 face and a smaller forward end, the forward end
being expanded into a Vvertically _elongated
bulbous chamber arranged with its major axis
vertical and having an exhaust opening at each
end thereof, there being a constricted passage
way between said chamber andthe remaining
portion of the device, and a one-way valve de
tachably mounted in said chamberand adapted
to be removed through said constricted passage
way, substantially as described.
3. A respirator comprising a main'body portion formed of a pair of forwardly tapered nexi
blelside walls connected at their longitudinal~
and adapted to fold against each other,
and said body portici: being expandedv forwardly
at the ends of the side walls to form a verti
cally elongated bulbous- chamber, said chamber 10
being closed at the front and havingan' exhaust
opening at both upper and lower ends. and a
one-way valve mounted in said chamber, in
which respirator the bulbous chamber is pro
vided with an inwardly opening annular seat
adjacent the constricted opening and a rigid ex
haust valve frame removably held in said seat
and a valve carried by said frame, substantially
as described.
4. A respirator comprising a body portion con-l
structed oi' a pair of forwardly tapered flexiblel
side walls connected at their longitudinal edges
forming a larger open rear end for engagingbver
the breathing openings of the face and asmaller
forward end, the upp'er and lower portions of
the face engaging edge being symmetrical, and
the forward endl terminating@- in an integral
bulbous chamber closed at the front and having
similar openings _at‘the upper and lower ends“
thereof, each constituting both an exhaust and a
drain port, and an exhaust valve and- rigid valve `
frame mounted in said bulbous chamber and re
movable through said body portion, substantially
as described.
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