An Improved Respirator.
Year: 1893

page_text: Date of Application, 4th Dec., 1893
Complete Specification Left, 3rd Sept., 1894-Accepted, 1st Dec., 1894
An Improved Respirator.
I, RICHARD LOWTHER JEFFREYS of 26 Geraldine Road, Wandsworth
Respirator Manufacturer do bereby declare the nature of this invention to be as
follows:-
I make respirators of the ordinary shape, and form, or of any shape or form
required but with the internal mechanism arranged to take up the heat from the
outgoing breath to warm the incoming cold air by causing it to pass through a..
number of fine tubes which fine tubes are produced by corrugating the metal plates
and then so placing them that they form tubes or cells. I may introduce thin
plates of metal between the corrugated plates so as to further subdivide the air.
passages Each layer of tubes or cells is connected with the one behind it at the
top or the bottom or both by an air passage or passages so that no air can reach
the lungs without traversing the considerable surface produced by this tubular
arrangement.
D
L
1000
R. L. JEFFREYS.
An Improved Respirator.
I, RICHARD LOWTHER JEFFREYS of 26 Geraldine Road Wandsworth
Respirator Manufacturer do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
I make respirators of the ordinary shape or form or any shape or form required
but with the internal mechanism so arranged as to take up the heat from the
outgoing breath to warm the incoming cold air by causing it to pass through a
number of fine tubes, which tubes I produce by corrugating thin plates of metal
and then placing them upon each other so as to form tubes or cells. I may
introduce thin plates of metal or other substance between the corrugated plates
so as to further subdivide the air passages. Each layer of tubes or cells is connected
with the one behind or adjacent to it by an air passage or passages at the top or
bottom or both, so that no air can reach the lungs without traversing the considerable
surface produced by this tubular arrangement.
Fig. 1 gives a view of the concave or inner side of two super-imposed corrugated
plates, the inner plate a a being in front of the plate bb and falling short of it
at top, the space by which it falls short from a to being left for the passage
of air.
Fig. 2 gives a view of the convex or outer side of the same 2 super-imposed
plates, shewing that the plate bb falls short of the plate a a at the bottom, the
space by which it falls short from 6 to a being left for a similar air-passage to the
next outer plate and so on with each successive plate the openings of the tubes
into each other alternate at top and bottom of the respirator.
Fig. 3 gives a central horizontal section of the above with a series of three sets
of tubes a b c the arched lines between each set of tubes or plates representing very
thin laminæ of metal or other substance interposed for the purpose of further
subdividing the air passages.

page_text: Fig. 4 gives a central horizontal section of a series of 4 corrugated plates or
tubes a b c d.
Fig. 5 gives a vertical section of the 4 corrugated plates in Fig. 4 a b c d and also
the front or shield plate ef covered or lined with a non-conducting substance and
having a slot or opening gh for the free passage of air, the arrow lines show the
direction taken by the current of air viz. up and down the tubes till it reaches
the perforated plate j k next the mouth.
Having now particularly described & ascertained the nature of my said inven-
tion & in what manner the same is to be performed I declare that what [
claim is
1st. A method of producing metallic tubes especially applicable to the purposes
of an efficient respirator.
2nd. The application or employment of such tubes in such a way as to recover
from the outgoing breath the maximum of heat in the minimum of space.
3rd. The modification of the principle to varying circumstances & the addition
of an external non-conducting substance to retain the heat & prevent its loss or
waste whilst at the same time allowing of the fullest and freest ventilation.
3rd September 1894.
R. L. JEFFREYS.