Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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The invention concerns a protection-hood to be used
in environments in which it is dangerous to work, including a
hood-shaped construction which covers the whole head, and by the
aid of an elastic collar stays close to the user's neck, as well
as arrangemen-ts for supply and abduction of air through hoses
which are connected to the hood. The hood for use especially in
places where there might be gases, dust etc., but it may also be
used as a protection hood when diving.
In places of w~rk where there are dust ox dangerous
gases, there are used dust-masks or gas-masks, and these are
usually itted with ventilators for breathing in and out whlch give a
considerable resistance against the air-flow. These masks will,
therefore, feel warm and clammy in use, since the resistance
makes it difficult to breathe, and wet used air remains within
the mask. It is thereore, difficult to get the worke~s to use
such masks.
There are protection-hoods of a relatively elastic
material, where through hoses or other similar arrangemants is
supplied air with a certain over-pressure, and this air to-
gether with respirated air leaks out through ventilators, ilters ~
or other places where air may escape around the neck of the user. :
French patent No. 1,599,791). `~
If enough air is forced lnto these hoods to ensure `
that respirated air and evaporated perspiration with certainty are
abducted~ this will lead to a cold draught against the fa¢e.of
the user.
The ai~ of the invention is to pro~ide a new and betterprotection-hood o the a~ove mentioned type, in which the mention-
ed disadvantaqes are a~oided.
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The present invention is broadly defined as a helmet
adapted completely to surround the head of the user and having
means to seal the helme-t to the user's body, -the h~lmet being
of double-walled construction comprising a pair of spaced inner
and outer walls of stiff material, the inner wall having an
opening in front and at least the outer wall being transparent
at least where it overlies the opening, partition means ex-
tending between the inner and outer walls from the top of the
opening of the inner wall rearwardly and downwardly to the
bot~om of the rear of the helmet, means to supply air to the
space between the walls on one side of the partition means,
and means to remove air from the space between the walls on
the other side of the partition means whereby air passes from
the supply means between the walls past the opening and
again between the walls of the removing means.
The advantages of this protec-tion-hood are that it
enables one to lead relatively large quantities of air
through the hood without imposing dangerous draughts on the
wearer, at the same time as clean breathing air with a high
amount of oxygen is maintained within the mask without impair-
ing vision with condensed breathing vapour.
Since the protection-hood is made of a stiff, clear
~; material, and since the collar is made in an elastic material,~
a good view from the mask i9 achieved. The double wa].ls will
help to xeduce the noise from the outside sources, of ten
found in working places with dust or dangerous gases, as for
example in mines, workshops and chemical industries.
The invention will be further described by the follow-
ing with reference to the drawlngs, and other characteristics
of the invention will also be seen from this description.
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In the drawings,
Figure 1 shows a section of the protection-hood
along the line A-A of Figure 2,
Figure 2 shows a section of the hood along the
line C-C of Figure 1, and,
Figure 3 shows a section along the line B-B of
Figure 2.
The protection-hood is in the P~igures 1 through
3 marked with the re~e~ence number 1 in general. It con-
sists mainly of an outer wall 2, an i.nner wall 3 as well
as a stiff partition wall 4, made in clear plastic, for
example "LEXAN" ~r
To the outer wall 2 on both sides of.the par-
tition wall 4 are secured two connectors for connecting of
air-hoses 5 and 6 such a way that air can be passed through
one of the hoses into the space 7 between the walls 2 and 3 and
thereafter out of the hood through the other hose. As driv-
iny force for the air can for example a fan (not shown)
be used, either with the suction-side connected to one of
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i~ -20 the hoses 5 or 6 (for under pressure ventilation) or the
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- pressure-side connected to one of the hoses 5 or 6 (for over-
pressure ventilation).
To the hose through wliich the air flows into. the
~; hood,is connected a cammon ~ilter (not ~hown) for absorbtion
of dangerous and poisonous gases and aerosols. This hose can r
... in the case of under~pressure-ventilation, be omitted and the
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'.~ filter mounted directly upon the hood.
On the end of the inner wall 3, which is meant to
. stay in front of the mouth and the nose of the user, an !
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opening 8 is provided, so the air, because of the partition-
ing wall 4 is fed past the opening so the user thereby may
breathe freely without any resistance from any ventilators etc.
The lower edges of the outer and inner walls 2 and 3, may be
made with flanges 9 and 10, which may be fastened in an
adequate way 7 as for example by nuts and screws 11. To the
flange 10 on the inner wall 3 is fastened a collar of air-
tight material 12, which may be fastened with an elastic
string around the users neck.
The protection-hood is kept in place by a harness
13 which is fastened to the inner wall 3 and may be of a
similar type to that which is used in most protection helmets.
To the harness is fastened a band 14 that may be regulated,
made of foam-plastic or a similar material, so it, to a certain
deyree, may be fitted or regulated to size or headshape. There
are also at proper places fastened straps 15 that may be
fastened under the chin of the user.
When in use, unpolluted air is fed past by the
opening 8, without the user being subjected to any noticeable
draught, at the same time as sufficient air is passed through
the hood l, so that used air and water vapour will be abducted.
An advantageous construction is to arrange for the
partition wall 4 to run along the whole vertical length of the
hood, and hoses 5 and 6 are attached to the bottom o~ the back o~
the hood, and on either side o~ the parkition wall 4, as the user
then may work relatively freely.
It is obvious that changes may be made in the
construction shown on the drawings. ~mong others, supporters
that reach down to the shoulders of the user may be constructed.
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The shown connec-tion of the inner and outer walls ~ and 3, as
well as of the collar 12 may be affected by means of gluing,
welding ~tc., and the choice oE material may depend on the use
of the hood l. It is also possible to construct the hood or
the helmet-mask from some other material than clear plastic. Under
working conditions where the plastic may be attacked by
chemicals or other materials, it might be nec~ssary to con-
struct at least the viewing section of glass or a similar
material, and the rest of the stiff part of the hood may be
constructed of, for instance, alumin~um. Even though the
-~ ` hood, according to the invention, is specially designed for
protection against du~t, gasest etc., it is obvious that it
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may also be used when diving in shallow waters. The advantage
~ of the hood in such cases is that it is easy to breathe in,
'~ and draughts are avoided.
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