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Патент USA US2112213

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‘March 22,. 1938,
I
‘
N. SCHWARTZ
I
2,112,213
RILTERTYPE RESPIRATOR
Fileq. Dec; _s,_ 1955
‘ zisheets-sh'eet 1
March 22, 1938.
. N, SCHWARTZ '
'
2,112,213
FILTER TYPE RESPIRATOR
Filed Dec. 5, 1955
2 Sheets-Sheet 2
21g
31
2 '
'
INVENTOIR
Patented Mar. 22, 1938
2,112,213
‘ UNITED STATES PATENT OFFICE
2,112,213
FILTER ms aEsrmA'roa
Nathan Schwartz, New York, N. Y.
Application December 3, 1935, Serial No. 52,627
A.
i
6 Claims.
(Cl. 128-146) ‘
This invention relates to ?lter type respirators
Referring to the drawings by character refer
ence, the respirator includes a face‘ piece desig
adapted to cover the nose and mouth for the
purpose of protection against dust, fumes, gases
nated generally by the reference character A and
a ?lter unit designated generally by the refer
ence character B, and the facepiece being pref
and bacteria, and is a modi?cation of my co
5 pending patent application Serial Number‘ 44,694,
?ling date October 12, 1935 now Patent No.‘ erably constructed of molded rubber or an equiv
alent ?exible material having the properties and
2,070,241.‘
.
The object of this invention is‘to increase the characteristics of rubber. The face piece con
?ltering e?lciency of?lter type respirators. by forms generally to the shape of the face- in the
10 means of locating ?lters advantageously.
That
is the positioning of the ?lters in such relation
to each other as to obtain increased ?ltering ef
?ciency without e?‘ecting a corresponding in
region of the nose and mouth and is formed with 10
a hollow nose covering portion l0 having a lower
horizontal wall II. The mouth and chin cover
ing portion I 2 is provided with an opening l4 and
is set back and it constitutes part of the rear
15
Another object of this invention is to simplify - wall of they ring ?lter unit B. The lower hor 15
construction by including the ?lter unit and face izontal wall II also constitutes part of the cir
part of the respirator in one mold cavity.
cumferential wall of the ring ?lter unit B. The
Another object of this invention is to make the mouth covering portion I2 is provided with a
respirator practical for dry ?ltration as well as vertical wall l3 which in one form of these type
for wet sponge ?ltration.
.
respirators contains an opening [4. The mouth 20
Another object of this invention is to increase covering portion is stepped back at its chin part .
the ?ltering area by providing for air space be ' in a substantial horizontal position l5 and it con
tween the ?lter support and the moldedrubber tains 9. depending tubular boss 16.
support.
'
‘
\
The face piece has attachedrat the sides there
With the above and other objects in view, the of a webbing fabric material I‘! which webbing
25
inventionis more particularly disclosed in the band has at its end, hooks l8 and ring ill by
following speci?cation and the accompanying which means the respirator 'is fastened to the
crease in the resistance to air ?ow.
'
drawings wherein a preferred embodiment,
exempli?es ‘the invention, while the appended
face of the wearer.
30 claims cover variations and modi?cations thereof.
In the drawings;
‘
The ?lter ring B is constructed of the same
material as the face piece A and they are molded 30
in a‘ single cavity mold and are therefore depend
-
Figure 1 is an anterior view of the improved
ent on one another and are joined in the said.‘
respirator showing the face part of the respirator
having attached thereto elastic bands, and also
showing the ring ?lter unit at the lower part of
the face piece.
mold cavity at the mouth covering vertical por
tion l3 and also at the lower wall set back ll
of'the nose covering portion III.
In Figure 1 is clearly shown the anterior view,
and the webbing band attachment 20 indicates
Figure 2 is a side view of the same.
Figure 3 is a rear view thereof.
manner of attachment of the webbing or elastic
'
band ll to the face piece A of the respirator. The
face piece is also provided with a nose ?ange 2| 40
which is adapted to engage the'nasal face por-'
tion and it also has a chin ?ange. 22» adapted to
engage the face at the chin part of the face andv
it has provided side ?aps 23 for engaging the fac
Figure 4 is a verticalv sectional view there
40 through taken approximately in the line 4-4 of
Figure 3, and it shows front and rear ?lter ele
ments having an intervening air chamber.
Figure 5 is a similar cross section at the line
4-4 of Figure 3, but a combination of gauze and
45 sponge ?lter is shown.
-
-
at cheek portion.
‘
-
Figure 6 is an anterior view and it shows the
interior side of the rear wall of the‘ ?lter ring
The ?lter ring part B has anteriorly an in
wardly directed flange 24 and this ?ange forms
and sectionally shows the foraminous support
covering the interior of the rear wall, and also
50 ‘the ?lter material attached to the foraminous
the outer wall of the external circumferentml
- Figure '7 is across section, like Figures 4 and 5
' but it shows the: third‘. form of this invention,
groove 25. The ?lter ring has a circumferential
wall 28 which in one part is a section of lower
nose covering wall ll. The rear wall 21 of the
?lter ring is in part joined with the vertical sec
tion l3‘ of the mouth covering portion l2, and
namely the ?ltration area is enlarged and air
w. is entering the ?lter device at front and at rear.
ing ll ‘or the inhalation of ?ltered air. The
support.
.
0
in one form of this invention contains an open
arrears
2
and the opening M, as is indicated in Figure 4,
rear wall 2? has provided at its inner side, inter
rupted rib elevations 28 which cause the formation
by the arrows. An advantage is present in the
fact that the air is made to pass two ?lters sepa
rated by an air chamber.
The second form of this invention is clearly
shown in Figure 5. Here we have the air pass
ing through the ?lter material 31, then the fo
raminous support 34, then the sponge ?lter ma
of grooves ‘29 and which grooves 29 become un
interrupted and form a continuous air ?ow space
29. The lower horizontal wall ll of the nose
covering portion i0 is a part of the ring cir
cumferential wall 26 and in one form of this
invention contains an opening 30 which connects
terlal 39, whence it converges at opening i4 and .
is ?ltered and ready for inhalation, the sponge
type of ?lters is desired when solvents or neu
the ring ?lter B with the face piece of the res
pirator A.
The lower horizontal wall l5 contains an open
ing in the tubular boss l6, within thistubular
boss i6 is inserted a ?utter valve which is kept
open by a comparatively rigid metal tube 32.
The
?utter valve’s usefulness is the permitting
15
of. easy exhalation.
‘
The ring ?lter unit which we designate with
the character reference B has at its internal por
tion and at the outer edge a circumferential
20 groove 25 and it also is provided with a similar
internal groove 33 and the rear wall 21 de?nes its
outer side. The rear wall 21 also has rib ele
vations 28 and grooves 29. It also contains the
tralizers are required in a respirator. For ex
ample at acid works, an alkaline solution is
bene?cial.
The third form of this invention is plainly lo
shown in Figure 7. Here we have doubled the
surface area of ?ltration. Air is entering as
indicated by the arrows, through the ?lter ele—
ment 31, and also through the hole openings 38
The air 20
entering in the openings 38 ?lls the air space
groove 29 and is ?ltered in its passage through
the ?lter material 36. The interrupted ribs 28,
which are present in the rear wall 21.
opening it for air passage to the face part of ‘ make the continuous uninterrupted groove 29 YO Ll
The grooves 25 and 33 contain and therefore the surface area at the rear ?lter
the foraminous supports 34, these foraminous is equal to the surface area at the front ?lter.
supports are preferably of metal construction and Therefore the resistance to air ?ow is diminished
are comparatively rigid so that there is a ?rm about 50% and therefor the filter material may
be increased in density or an additional ?lter
supporting hold for the ?lters and for the main
layer may be added, and thereby greater ei?
30 tenance of the air chamber 35, which is located‘
between them. Both foraminous supports 34 ciency may be obtained. If greater e?iciency is
not required then there is still greater ease in
have attached ?lter elements 36 which ?lter ma
25 the respirator.
terials are usually of textile or felt fabric.
support 34. In one form of this invention an
extra. removable ?lter fabric material 31 is in
serted, and it forms a front ?lter. In another
form of this invention a sponge ?lter 39 is used
40 and its insertion into the ring ?lter B takes place
through the opening i4.
breathing and therefore the improvement is still
The
attachment of the ?lter material is usually made
35 at the edge circumference of the foraminous
.
In my copending patent application Serial
Number 44,694 the face piece A is separate from
the ring ?lter unit B and the two are joined at
45 the opening in the set back horizontal wall II.
The need in some instance for a separate ring
?lter unit is that more and thicker ?lter mate
rials may be used and conveniently so used.
Therefore in the dry ?lter type respirators this
unit, has a decided value for use as protection
against dangerous dust or fumes where the re
quirement for separation is very high. That is
where it is required to ?lter almost 100% of the
foreign substance. However, the said type res
pirators, namely those having separate ring ?lter
units, are not practical for moist ?ltration, that
is, a sponge ?lter cannot be accommodated. But,
with the present modi?ed invention such a
60 sponge ?lter can be accommodated. Sponge ?l ters are often needed in case a neutralizing solu
tion is desired. The present modi?cation is less
costly clue to labor saving. Time is required to
Join the face piece and the ring ?lter unit.
The present modi?cation and improvement
may be used in three different forms.
One form is clearly shown in Figure 4, which
is a cross section.
The air intake in this form
is at the opening I4 which opening is in the
70 vertical wall i3 of the mouth covering portion
ii. The air is ?ltered by means of ?lter ele
ment 3?, thence the air passes to the air cham
ber 35, then it is again ?ltered by'the ?lter ele
ment 36, then it passes through the foraminous
75 support 34, then into the ‘zrooved air space 29
'
In Figure 6, it is clearly shown that the in 35
terrupted elevated ribs 28 form an- uninterrupted
groove 29 which groove is continuous to the open
ing H. The need of this arrangement is present
.in the first and third forms of this type of im
proved respirators and the reason therefore is
that it provides a greater ?ltering area. In Fig—
ure 4 and in Figure 7, arrows indicate air ?ow
in the said grooves.
The horizontal set back below the nose line of
the respirator is a distinct feature in this im
proved respirator as well as in my improved
50 type, namely the type with the joined ring ?lter
65
apparent.
respirator described in my copending applica
tion for United oStates Letters Patent, Serial
Number 44,694, ?ling date, October 12, 1935. The
said horizontal set back H is clearly shown,in 50
Figures 2, 3, 4, 5, and '7 and this set back is made
with the object in view, that the vision of the
wearer of the respirator shall have no down
ward obstruction. Because frequently on ?oors
of workrooms where respirators are worn there
are tools and other materials and if these become
unseen due to a respirator obstruction they may
cause tripping and falling.
What is claimed is:
1. A ?lter type respirator including a face part 00
having a hollow nose covering portion formed
with a lower wall and a set back mouth and
chin covering portion and a ?lter unit located
under said nose covering portion and in front of
the mouth and chin covering portion, and the
?lter unit comprising a casing and the said casing
being an integral part of the face piece of the
respirator at the horizontal nose covering por
tion and at the vertical chin and mouth covering
portion, and the ?lter unit having communica 70
tion with the ‘face part of the respirator by
means of an opening in the mouth and chin
covering portion.
.2. A ?lter type respirator having means pro
vided for engaging theface of the wearer and_
2,112,213
having a hollow mask face portion, including a
noge covering portion, formed with a lower wall
an a set back mouth and chin coveringv portion,
a circumferential wall being a part of the lower
Wail of the nose covering portion and extending
downward therefrom and forming a ring, the
said circumferential wall having a rear wall
which in part is the set back mouth and chin
covering portion, thesaid ,rear wall having an
opening provided at the set back mouth and chin
covering part, the said circumferential wall hav
ing at its anterior, annular inwardly directed
?angesand internal'grooves de?ned in part by
said ?anges, ?lter elements and foraminous sup
15 port therefor located within said groove and the
?lter element retained in place by the said in
wardly directed ?anges.
3. A ?lter type respirator having means pro
vided for engaging the face of the wearer and
20 having a hollow mask face portion, including a
nose covering portion, formed with a lower wall
and a set back chin and mouth covering portion,
a circumferential wall being a, part of the lower
wall of the nose covering portion and extending
down therefrom and forming a ring, the said
3
ring having av rear wall which in part is the set
back chin and mouth covering portion, the said
casing being provided with suitable ?lter element
which ?lter element is properly located within
the said casing and the said casing having an
opening connection with the hollow mask por
tion.
5. A ?lter type respirator having a hollow
mask face body, the said hollow mask face body
having a set back below the nose line and an 10
opening for air intake located in said set back
and having direct connection at the said open
ing with a ?ltering device which includes a cas
ing, part of which casing is an in gral part of
the face body and which casing is provided at 15
its intake with a circumferential groove for con
taining a supporting foraminous element and a
?lter: material removably placed anteriorly to
said foraminous-support and held in place by
means of inwardly directed ?anges.
20
6. A ?lter type respirator having a hollow
mask face portion wherein is provided a set back
below the nose line, a ?ltering device partly lo
cated within the outer portion of said set back
and also parts of the walls of the ?ltering device 25
circumferential .wall having a rear wall which in ' are simultaneously parts of the walls of the set
part is the set back chin and mouth covering back portion, and the said ?ltering device hav
portion, the said rear wall containing at its in-_ ing a circumferential wall and the circumfer
terior side interrupted elevations for the forma
30 tion of uninterrupted air ?ow grooves, the said ential wall having grooves located internally at
the edges and the forward groove is de?ned by
circumferential wall having at its internal rear anterior inwardly directed ?anges, ‘at its anterior
end a circumferential groove formation, the said part and the rear groove is defined by the rear
groove formation is de?ned in part by the rear wall of the ?ltering device,'which rear wall forms
.wall of the circumferential wall, the said circum
the ‘posterior part of the groove, and the said
ferential wall having at its anterior, annular in
rear wall being provided with interrupted ele 35
wardly directed ?anges, ?lter elements and fo
vated ribs and between said ribs are formed
raminous support therefor located within said groove formations, and said rear wall having
groove and the ?lter element retained in place by holes provided at its lower section for air intake
the said ?anges and an opening provided between purposes, foraminous supports." having attached
“the ring ?lter and the hollow mask body.
?lter materials closely held by the grooves lo
4. A ?lter type respirator having means pro
cated at the edges of the circumferential wall, 40
vided for engaging the face of the wearer and an opening provided for air intake located in" the
having a hollow mask face portion, including a horizontal portion, of the set back and the said
nose covering portion and a set back chin and opening connecting with the air chamber formed
45 mouth covering portion, a'circumfere'ntial wall between the two foraminous support elements
being a part of - the lower wall of the nose cov
which'support elements have ?lter materials at 45
ering portion and extending therefrom down
tached.
v
ward and forming a casing and the said casing
NATHAN SCHWARTZ.
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