IMPROVEMENTS IN THE CONSTRUCTION OF RESPIRATORS
Year: 1878

page_text: LETTERS PATENT to Joseph Ralph Chislett, of Plymouth, in the County of
Devon, for the Invention of "IMPROVEMENTS IN THE CONSTRUCTION OF
RESPIRATORS."
Sealed the 6th August 1878, and dated the 7th May 1878.
PROVISIONAL SPECIFICATION left by the said Joseph Ralph Chislett at the
Office of the Commissioners of Patents on the 7th May 1878.
JOSEPH RALPH CHISLETT, of Plymouth, in the County of Devon.
IN THE CONSTRUCTION OF RESPIRATORS."
"IMPROVEMENTS:
This Invention relates to certain improvements in the construction of the articles
called "respirators," and which are used by porsons subject to lung and chest
diseases, or to affections of the bronchial tubes.
The respirators constructed in accordance with the present Invention possess:
great advantages over those previously used, inasmuch as they are capable of being
placed in the interior of the mouth, so that they present no unpleasant external
appearance, can be worn at all times without being conspicuous or occasioning any
inconvenience, whilst they allow of aromatic and disinfecting agents being used in
combination therewith.
The main portion of the respirator which forms the subject of the present Inven-
tion consists of two thin plates of metal or other substance adapted for the purpose,.
of a semicircular or other suitable shape, the same being respectively cut or moulded
so as to fit the mouth.
The front edges of the plates are curved so as to cover or partially cover the
teeth, a portion of the flat part of each plate being perforated and having a rim
enclosing the perforations, on each of which rims is fixed a cover or small plate,
each of which is also perforated, such small plates being hinged to the rim which
encloses the perforations.
Two small rings are provided for a clasp for the covers, and which prevent the
instrument coming out of the mouth. Two non-absorbing pads are also provided,
The two
which fit around the rims and act as soft pads for the teeth to act on.

page_text: plates are hinged and connected at one edge thereof by means of a small barrel or
tube, and which is placed across the mouth. A spiral spring is arranged within the
barrel or tube, so that when the mouth opens the instrument acts in unison and
expands accordingly.
Two perforated chambers are placed on the flat plates, the same being filled with
cotton wool impregnated with any suitable essence, thus imparting ease and comfort
to the lungs and giving a pleasant odour to the breath.
The instrument goes into the mouth to about the distance of an inch or an inch
and a quarter, the air passing in at the top and bottom plates, and the expira-
tions of the breath of the wearer through the perforations in the top and bottom
plates.
The edges of the main plates of the instrument may be so formed as to have the
appearance of teeth.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Joseph Ralph Chislett in the Great Seal Patent Office on the 7th
November 1878.
JOSEPH RALPH CHISLETT, of Plymouth, in the County of Devon.
IN THE CONSTRUCTION OF RESPIRATORS."
"IMPROVEMENTS
My said Invention relates to certain improvements in the construction of the
articles called "respirators," and which are used by persons subject to lung and
chest diseases, or to affections of the bronchial tubes.
The respirators constructed in accordance with my said Invention possess great
advantages over those previously used, inasmuch as they are worn in the interior of
the mouth, so that they present no unpleasant external appearance, can be used
at all times without being conspicuous or occasioning any inconvenience, whilst
they allow of aromatic and disinfecting agents being used in combination there-
with.
The main portion of the respirator which forms the subject of my said Invention
consists of two thin semicircular plates of metal or other substance adapted for the
purpose, the same being hinged together and respectively cut or moulded so as to
fit the mouth.
The front edges of the plates are curved, so as to cover or partially cover the
teeth, each plate being provided with a rim, on each of which rims is hinged a
cover or small plate, the same being perforated and forming the inner sides of the
chambers or cells herein-after described.
Two small rings are provided to act as a clasp for the covers or plates, and which
prevent the instrument from coming out of the mouth. Two non-absorbent pads
of any suitable material are also provided which fit around the rims, and which pads
are adapted for the teeth to rest upon. The plates are respectively hinged and.

page_text: connected at one edge thereof by means of a small barrel or tube, and which is
placed across the mouth. A spiral spring is arranged within the barrel or tube, the
ends of which are respectively provided with a slot to enable the spring to act so
that when the mouth opens the parts of the instrument act in unison and expand
accordingly.
Two perforated chambers or cells are placed on the flat plates for the purpose of
being filled with cotton wool impregnated with any suitable or desired ossence or
agent, thus imparting ease and comfort to the lungs and giving a pleasant odour to
the breath; thus the respirator acts also as an inhaler.
The instrument is inserted in the mouth to a suitable distance, the inspired air
and the expirations of the breath of the wearer passing through the perforations in
the covers of the chambers or cells and the contents of the latter, and is thus
warmed before reaching the lungs.
The edges of the first-mentioned or inain plates of the instrument may be so
formed as to present the appearance of teeth.
I will now proceed to refer to the annexed Drawings, from which the nature of
my said Invention will be more clearly understood.
Figure 1 is a front view, and Figure 2 a back view of the apparatus in its normal
position, and Figures 3 and 4 are respectively front and back views of the samne
folded ready for placing in the mouth.
In the several Figures the same letters of reference refer to similar parts.
a are the semicircular plates of metal or other substance; bare the rims thereof;
c, the hinged covers or plates; d are the non-absorbent pads; e is the hinge connecting
the two plates a; and fare the perforated chambers or cells.
Having thus described and ascertained the nature of my said Invention, I would
observe in conclusion that what I consider novel and original, and therefore claim
as constituting the Invention secured to me by the said herein-before in part
recited Letters Patent is, the combination and arrangement of parts and mechanism
in the construction of respirators, substantially as herein-before described and set
forth.
In witness whereof, I, the said Joseph Ralph Chislett, have hereunto sot my
hand and seal, this First day of November, in the year of our Lord One
thousand sight hundred and sawzanty night
Signed, sealed, and delivered by
the said Joseph Ralph Chislett,
in the presence of
RICHP. H. DAWE,
Sol
Plymouth.
JOSEPH RALPH CHISLETT. (L.S.)