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Патент USA US2404686

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3H3? 2, 14.
Filed Jan. 7, 1943
Jam/1 EBB/5051mm
Patented July 23, 1946
Joseph B. Biederman, Cincinnati, Ohio
Application January 7, 1943, Serial No. 471,603
2 Claims. (Cl. 128-146)
- This invention relates ‘to improvements in a
respiratory ?ltering device and particularly to
improvements on applicant’s copending applica
similar reference characters are employed .to de
note the same or similar parts.
The respiratory ?lter of this invention com
prises a, body member ‘ID of a general U‘ shape
having in effect arms H and I2 connected to
gether by a base portion l3. The outer edges of
the arms II and I2 are substantially regular in
outline while the inner or opposed edges of said
tion Serial Number 408,627 and to improvements
in the replaceable ?ltering pad used therewith.
The principal object of this invention is the
provision of a respiratory ?ltering device that is
inexpensive to manufacture yet sturdy of con
struction and easy to operate.
arms are cut away as at I4 and I5 to outline the
Another object of this invention is the provi 10 nose and mouth of the user. The said contoured
edges of the arms are provided with an upturned
sion of a ?ltering device, as above set forth, with
?ange 16 so that a rounded edge is presented to
which an improved ?lter pad may be employed
the face instead of a sharp edge of the sheet
to provide a de?nite seal around the nose and
metal from which the body member I0 is
mouth of the user.
Another object of this invention is the provi 15 stamped.
The upper ends of the arms II and I2 are con
sion of a ?ltering device that will conform with
nected by an elastic member II which as illus
the contour of the face of the user around the
trated in the drawing is elastic fabric. In prac
nose and mouth without uncomfortably clamp
tice the elastic member I‘! follows the contour of
ing itself against the user’s face.
A further and speci?c object is the provision 20 the wearer’s nose with end of the arms lying at
of a replaceable ?lter pad for use with a respira
tory ?ltering device that will not bunch and will
lie ?at between the device and the face of the user
to form a perfect seal against air passing there
the base of the nose.
As seen in Fig. 3 the mask body I 0 is trans
versely curved so as to conform to the curvature
of the face of a user. In order to hold the mask
25 in position the arms H and I2 are respectively
around to the nose and mouth of the wearer.
provided with a piercing resulting in an upturned
Other objects and advantages of the present
hook I 8 and Hi to which, respectively, is remov
invention should be readily apparent by reference
ably attached a coupling 29 and 2| having be
to the following speci?cation considered in con
junction with the accompanying drawing form 30 tween them an elastic mask attaching bank or
strip 22 which encircles the back of a user’s head.
ing a part thereof and it is to be understood that
Cooperating with the mask body [0‘ is-a wire
any modi?cations may be made in the exact
frame 23 having, in front elevation, the form il
structural details there shown and described,
lustrated in Fig. 1 which, as will be noted, has an
within the scope of the appended claims, without
outline substantially identical with the opening of
departing from or exceeding the spirit of the 35 the U frame. The wire frame 23 comprises an
arcuate transverse portion 24 from which de
In the drawing:
pends sides 25 and 26 contoured similarly to the.
Fig. l is a front elevation of a respiratory ?l
tering device embodying the improvements of this
contours l4 and I5 of the arms H and I2. Inte-
gral with and extending from the wire frame sides
25 and 26 are arms 21 and 28 which project to
Fig. 2 is a, vertical sectional view through the
ward one another for a distance and then are
device taken on line 2-2 on Fig. 1.
rearwardly directed as at 29, The rear end of
Fig. 3 is a horizontal sectional view through
the arms 2‘! and 28 bend downwardly to provide
the device taken on line 3—3 on Fig. 1.
legs 30 and 3| with their‘lower ends outwardly
Fig. 4 is a fragmentary elevational view of a 45 projected to form trunnions 32 and 33, as will
portion of the device as seen from line 4-4 on
later be made clear.
Fig. 2.
The base l3 of the filter body member l’ll sub
stantially centrally thereof is offset to provide a
channel 34 of a width substantially equal to the
5-5 on Fig. l.
50 distance between the wire frame legs 3|] and 3|.
Fig. 6 is a plan view of the ?lter pad as used
The sides 35 and 3B of the offset 34 are adapted
in the ?ltering device of this invention.
to be engaged by the wire frame legs and the said
Fig. '7 is an edge view of the ?lter pad illus
sides are each provided with an aperture 31
trated in Fig. 6.
through which projects the trunnions 32 and 33. Throughout the several views of the drawing 55 By this construction the wire frame 23 is
Fig. 5 is an enlarged fragmentary sectional view
through the clamp of the device taken on line
adapted to be oscillated from the position illus
?lter the ?brous or cotton layer does the ?lter
ing and is of considerable thickness with the
trated in full lines in Fig. 2 to the position illus
trated in dotted lines therein. With the frame
in the dotted line position of Fig. 2 a, ?ltering pad
38, of Figs. 6 and 7, may be placed on the under
forcing backing for the ?lter.
For clearness in illustration the ?lter pad 38
woven fabric layer 49 acting merely as a rein
side of the ?lter body for subsequent positioning.
is shown in certain of the views of the drawing in
The wire frame 23 is oscillated from its dotted line
phantom lines.
position to the solid line position of Fig, 4 there
by. positioning the ?lter pad 38 outwardly of the
From the foregoing it will be noted that there
has been provided a respiratory ?ltering device
nose andzlmouth ‘of :a wearer while'l' having ,the .i
comprisingxla ‘single member: ‘of’ ‘sheet? material
marginal‘rportion of the pad 38 between the ?lter
body portion In and face.
which may: be-either metal-orpl'astic ‘and of a
In order to retain the Wire frame 23 in its opera" - I
ative position use is made of a~~1ocking ,devica
illustrated most clearly in Fig. 4.” The locking
device comprises a locking membereoflzésubstans;
tially T shaped formation comprising. a cross
member 39 providing arms 40"’"an'd ‘4| "with ya
tongue 42 depending from the cross amembe'ri'
from between the arms 40 and M.
general U shape to lie below and around the nose
and mouth of a person. Associated with this
singlewmember-is: a simple wire frame cap-able
of being positioned ahead of the single sheet
member for holding a ?ltering pad in front of
the respiratory. organs. It will further be noted
‘that there has been'provided a ?ltering pad of a
particular .outline or contour and construction
The ends of 20 adapted for use with the‘ ?ltering device of this
the tarmssd?land .4 I are. upwardly ,bent or arched .
as at 43mto lie) on thelupperrsurfaces, of the legs .
30 and 3|. whenclamping the-wire framein posi
invention‘, and which WilLDI‘OVidG: a de?nite rseal
aroundttherespiratory organs“. ,
What. is claimed-is:-
tion. l In=orderuto bscillatetheclamping lmem
1. Ina ‘device. of the ‘class. ‘described the "comet:
berit ‘iswconnected byalriv'etw 44 to‘ thesbase‘of '25 bination ofla bodyv member hayingra centrallopen-s
ing for. the; respiratory organs comprising _a base
the offset 34.“ .
The. ?lter pad :38,Las.lnoted. above. engages with
member and arms: attthe. ends of ‘the baseI.mern-.
the .unde‘rsurface .of “the v?lter ‘body .10 ‘and "the -
her, said ‘base; memberhhavin'gla channelwlikei
facelo?a user .and thereby‘ acts-asva seal against
offset, a wire frame havingrdepending.legsjoiir:
in?ltration of airexceptby way. of; the openvwire v30 naled in the channel wallsi for. movement be
frame .l23l'and. therearound through ‘the ?lter pad.
tween the body member arms to a position ahead
In ordervthat a seaLmay bessosprovided'and to
prevent .bunchingof lithe-pad =upon ‘actuation of;
the wire .framethel-pad p38‘ is. cut- as illustrated
ofcthesrespiratory organs and a ?lter pad located
in front of the wire frame and ‘behind the body}
member, and said ?lter pad having a tongue p01?‘
in Fig. 6. "As there illustrated the pad is generally 85 tion extending between .the wire. frame; legs
semi-circulars in ‘outline ,.with (a “substantially
whereby the said?ltering pad exte'ndsat‘least to.
straight lowenedge ‘45' and‘ which‘ outline 'con~
the..bounding edge .of. the‘ body; member," and,”
forms .with thengeneral outline .' of l the“ ?lter body
means for locking the wire frame in its‘ forward ‘
exceptior.beinglsomewhat larger. in area. ' Ex-;_
position, comprising ai'T shaped member pivots"
tending . into ‘‘the. pad from .its: ;lower edge a are, (a =40 allyvmounted in the offsetcchannel having-arms‘
pair of cuts 46 and “providing-between them
adapted to overlie thev wire ‘frame legs 'and~‘a
a tonguelMiw In practice they tongue 48 is- drawn
tongue projecting below‘ the body' member
down ‘between the .wire frame legs 30 ‘and 3t>afe >
2. ‘In a device of the class 'describedtlie ‘com;
fordinga means, for holding the. pad ‘in position >
bination of a U shaped body member'adaptedito I‘ V
duringlthe oscillation-of-the frame from thedot 45 have its arms disposed'on‘each side-of themes-"'
ted- to the solidiline¢;position.~of'Fig. '2 and~pre-'
venting .abunchinglorl-upward movement of the '
said- pad by the-wire frame legs. which would
piratory organs and its' base portion therebelo'w, *
an elastic fabric connection‘ between *the (free
ends of the‘ arms for overlying the ~no'se;~‘a 1Wire 1
frame oscillatably mounted "on they base/'ofifthel
“and, cuts “and {41 whichlprovide passageways 501-1 U shapev frame for- oscillatory ‘movementibé-‘t
occurif the pad were not provided With the tongue ~
for thesaid legs.- _ Byw this construction :the seal
base I3,‘ is maintained instead of : being broken as :
would be ‘the ‘case with a tongueless 'pada
tween the arms to a position‘ aheadh’oisfthe 'U"
frame, means-‘for locking ‘the Wire‘ framevin its
forward position, and a ?lterpad-idisposed‘iaheadll’
of the wire frame and behind the ‘U‘ shaped :body”
Th'e?lter pad-38 maybe cut from any ?ltering‘
,member and 'connectingielastic: fabric‘; andihavé' '
material» on the ~market; ‘such - ass-is. illustrated; /
ing a tongue overlying the wire framerlo’ckingll
at the lower'end of the mask body, or across-the -
comprisinga wovenlgauze like layer 49 and la
?brous or: cotton: layer 59.“ With‘ this type.- of
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