U.S. patent number 3,736,928 [Application Number 05/124,259] was granted by the patent office on 1973-06-05 for collapsible face mask.
Invention is credited to Bror Axwl Erling Andersson, Erik Arne Andersson.
United States Patent |
3,736,928 |
Andersson , et al. |
June 5, 1973 |
COLLAPSIBLE FACE MASK
Abstract
The invention is concerned with a hygienic face mask formed from
a single sheet of air-filtering fibrous sheet material so folded as
to provide a free space between outer and inner walls of the mask.
Air flow openings are or may be provided at the rear end portion of
the outer walls. The mask is held snugly against the nose and
adjacent portion of the face of the wearer by means of a stiff but
deformable clip member inserted in slits in the top of the
mask.
Inventors: |
Andersson; Erik Arne (111 57
Stockholm, SW), Andersson; Bror Axwl Erling (111 57
Stockholm, SW) |
Family
ID: |
22413783 |
Appl.
No.: |
05/124,259 |
Filed: |
March 15, 1971 |
Current U.S.
Class: |
128/206.19;
128/863 |
Current CPC
Class: |
A41D
13/113 (20130101) |
Current International
Class: |
A41D
13/05 (20060101); A41D 13/11 (20060101); A62b
023/02 () |
Field of
Search: |
;128/146.2,146.6,139,141 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
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|
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62,257 |
|
Mar 1944 |
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DK |
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4,789 |
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Dec 1912 |
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GB |
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Primary Examiner: Kamm; William E.
Assistant Examiner: Dunne; G. F.
Claims
We claim:
1. A collapsible hygienic face mask cut from a W-folded web of an
air-filtering fibrous sheet material, comprising two identical
double-walled halves which in their superimposed position before
use have a common forward convexly curved edge (5) and two
coinciding rearward straight edges (16, 17) corresponding to the
folded side edges of the W-folded web, the inner (3, 4) wall
portions and outer (1, 2) wall portions of the two halves of the
mask being joined together along the common forward curved edge (5)
from its ends to the ends (9, 10) of a middle portion thereof
located in front of the mouth region of the mask, where the forward
edge of the outer wall, constituted by the joined outer wall
portions, in said middle portion is spaced from a straight middle
portion (13) of the forward edges of the inner wall portions which
are joined together by a fold (13) corresponding to the middle fold
of the W-folded web, whereby a free space (15) at the mouth region
will be formed between the outer and inner walls when the mask is
adjusted to the face of a wearer, the inner wall of the mask being
unbroken, the two outer wall portions being provided at their rear
end portions with openings (20, 21) for exhaled air having passed
through the inner walls to said free space between said inner and
outer walls.
Description
The present invention relates to face masks, and has as its object
the provision of a collapsible hygienic face mask which is suitable
for mass production, at a low price, but which is, nevertheless,
effective and comfortable to use. Due to its low price, the mask
may be disposed of after it has been used.
The mask according to the invention is made of a foldable,
air-filtering sheet of permeable fibrous material.
A suitable embodiment of the invention is shown by way of example
in the accompanying drawing, in which
FIG. 1 is a plan view of the mask with its two identical halves in
superimposed position, that is, lying flat on each other;
FIG. 2 is a cross-section along line 2--2 in FIG. 1;
FIG. 3 is a diagrammatic perspective view of the mask when the
halves of the mask are spread apart and the mask is cut along the
line 2--2 in FIG. 1; and
FIG. 4 is a diagrammatic view of the mask when mounted on the face
of a person.
The mask is made of a single piece of a foldable, non-woven,
air-filtering fibrous sheet material which has been cut from a
continuous web of such material, and which has been folded to a
generally W-shaped cross-section as will be understood from FIG.
2.
The mask comprises two identical double-walled halves each of which
has outer walls 1 and 2 respectively and inner walls 3 and 4
respectively. The forward edge 5 of the mask, which is also the
junction of the forward edges of the outer walls 1, 2, is concavely
curved, whereas the rear edge 6 of the mask is straight.
From the ends 7, 8 of the curved forward edge 5 to a middle portion
located between two points 9 and 10, the outer and inner walls 1, 2
and 3, 4, respectively are united along lines 11 and 12. Between
the points 10 and 11 the front edges of the inner walls are joined
together by a straight fold 13 which is spaced from the uniting
line 14 joining the edges of the outer walls between the points 9
and 10. Thus, a free space 15 -- roughly approaching in shape the
segment of a sphere -- is formed between the outer and inner walls
in the mouth region of the mask.
The rear ends of the inner and outer walls are joined by folds 16
and 17 respectively, and here an elastic attachment string 18 is
passed between the walls to enable the mask to be attached to the
head of a wearer.
The exhalation and inhalation air will pass through the two layers
formed by the outer and inner walls as indicated by the arrows 19
in FIG. 3. However, in the example shown, part of the air will pass
through the space 15 and the tunnel passage formed between the
outer and inner walls 1, 3 and 2, 4 to air flow openings 20, 21 in
the rear end portions of the outer walls as indicated by the arrows
22. These openings may be provided when it is desired to facilitate
breathing.
A deformable metal strip 23 is secured at the upper end of the
forward edge 5 and has its legs inserted into slits 24, 24 in the
outer walls. When the mask is mounted on the face of a person and
strip 23 is pressed tightly against the nose, the strip will retain
its shape and will hold the mask tightly against the nose and
surrounding region of the face. Thus escape of air at the upper
edges of the mask may be substantially prevented.
* * * * *