Improvements in Respirators.
Year: 1892

page_text: Date of Application, 9th Feb., 1892
Complete Specification Left, 9th Nov., 1892-Accepted, 21st Jan., 1893
PROVISIONAL SPECIFICATION
Improvements in Respirators.
We REBECCA SABINA DONISTHORPE of the firm of Whitaker and Donisthorpe
Manufacturers of 12 Oat Lane in the City of London and ERNEST NORMAN
BURTON DONISTHORPE also of 12 Oat Lane in the City of London Merchant
do hereby declare the nature of this invention to be as follows:-
This invention relates to respirators and has for its object to produce a simple
and economical device that can be readily adjusted so as to fit closely around the
mouth of the wearer and will moreover effectually filter (and also if necessary-
disinfect) and purify the air before it is inhaled into the lungs of the wearer.
For this purpose we proceed as follows:
A light frame of wire or wire work of a ductile and non-springy nature is formed
over this a thin covering of fabric is placed (advantageously black as this forms
the external covering).
Within this is placed a quantity of fibrous material such as wool silk noils
etcetera (but for this purpose we recommend the material known as "Sedox" and
made and produced under Letters Patent from the noils of China grass) and such
packing or filtering medium is then covered in by a gauze or other suitable cover.
on the inside.
To adjust this respirator to the face of the wearer it is simply pressed up close
against the face and bent into the desired shape which the metal framework then
retains and in order to make this respirator fit accurately and close up against the
face of the wearer all round its edge we arrange and mount thereon in any suitable
manner a piece of small india rubber or the like tubing so that this elastic and
easily compressible tubing will give to the inequalities of the face of the wearer'
and thus make a close fit all round the respirator.
The rubber tubing may be covered over by velvet or other suitable material in
any desired or suitable manner.
1
.
1003
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the. Applicants.
COMPLETE SPECIFICATION.
Improvements in Respirators.
We, REBECCA SABINA DONISTHORPE of the firm of Whitaker and Donisthorpe,
Manufacturers of 12 Oat Lane in the City of London, and ERNEST NORMAN
BURTON DONISTHORPE also of 12 Oat Lane in the City of London, Merchant,
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:-
This invention relates to respirators and has for its object to produce a simple
and convenient device that will readily adjust itself so as to fit closely around the
mouth of the wearer and will moreover effectually filter (and also if necessary
disinfect) and purify the air before it is inhaled into the lungs of the wearer.
And in order that our present invention may be easily understood and readily
carried into practice we will proceed to describe same with reference to the
drawings hereunto annexed,

page_text: DESCRIPTION OF THE DRAWINGS.
Fig. 1 is plan of our improved respirator i.e. a plan of the back or inner side
thereof.
Figure 2 is a side elevation or edge view.
Figure 3 is a cross section on line
a Figure 1.
a 18 a light frame of wire or wire-work of a ductile and non-springy nature and
over this a thin covering of fabric b is placed-this fabric being advantageously
black in colour as this forms the external covering on the front of the respirator.
Within this covering 6 is placed a quantity of fibrous material 2 such as wool,
silk noils etc. (but for this purpose we find it very advantageous to use the material
known as "Sedox") and such packing or filtering medium is then covered in by a
gauze or other suitable cover c on the back or inner side of the respirator.
To adjust this respirator round the mouth of the wearer it is simply pressed up
close against the face and bent into the desired shape which the metal framework
then retains and in order to make this respirator fit accurately and close up against
the face (ie. round the mouth) of the wearer all round its edge we arrange and
mount thereon in any suitable manner a piece of soft india-rubber or the like
tubing d so that this elastic and easily compressible tubing d will "give" to the
inequalities of the face of the wearer and thus make a close fit all round.
The rubber tubing d may be covered over by velvet or any other suitable
material in any desired manner.
The filling material z may be chemically impregnated with any desired material
and in any suitable manner if desired so as to disinfect or otherwise chemically
_affect the air passing through-same.
ee are ordinary elastic bands for securing on the respirator or our improved
respirator may be secured in any other desired manner.
Having now particularly described and ascertained the nature of our said-inveu-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. A respirator consisting of a frame such as a back and front coverings such
as b and c enclosing fibrous material such as z and a soft india-rubber tube such as d
mounted on the back thereof arranged combined and acting substantially in the
manner and for the purposes hereinbefore described and illustrated in the drawings
hereunto annexed.
2. The combination with a respirator of a soft india-rubber tube arranged and
mounted on the back thereof (i.e. the side next the face) so as to act as packing
round the mouth of the wearer substantially in the manner and for the purposes
hereinbefore set forth.
Dated this 9th day of November 1892.
TONGUE & BIRKBECK,
34, Southampton Buildings, Chancery Lane, London, W.C.,
Agents for the Applicants.