An Air Filter.
Year: 1892

page_text: Date of Application, 29th Oct., 1892
Complete Specification Left, 22nd July, 1893-Accepted, 26th Aug., 1893
PROVISIONAL SPECIFICATION.
An Air Filter.
We, EDWARD FREER DANIEL, of 89, Derby Street, Burton-on-Trent, in the
County of Stafford, Engineer and GEORGE HARRIS MORRIS, of 6, Alexandra
Road, Burton-on-Trent, in the County of Derby, Brewers Chemist, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to apparatus for filtering air so as to clear it not only
from larger impurities but also from minute impurities and particularly from
germs.
For this purpose we prepare a number of long bags or tubes, closed at one end,
of textile fabric felt or like porous material, and we lightly stretch these over wire
frames which have mouth pieces with holes through them. We fix these mouth
pieces to plates or partitions separating a chamber to which air is admitted from
a chamber in which the tubes are arranged so that air in passing from the one
chamber to the other has to pass through the pores of the fabric. There may
be in each case several thicknesses of fabric, and some of the tubes may be more
pervious so that the air may receive a preliminary filtration in passing through
them before passing through the others. We find it convenient to arrange the
tubes for preliminary filtration within a cylindrical case and those for final filtration
in an annular space surrounding this case. In order to effectually clear the air
of germs we employ sterilised fabric, or, after the tubes are fixed in place we
sterilise them and the chamber containing them by the application of steam or
other source of heat.
Dated this 29th day of October 1892.
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
An Air Filter.
We, EDWARD FREER DANIEL, of 89 Derby Street, Burton-on-Trent, in the
County of Stafford, and GEORGE HARRIS MORRIS, of 6 Alexandra Road,
Burton-on-Trent, in the County of Derby, Brewers Engineers, 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 :-
Our invention relates to apparatus for filtering air so as to clear it not only
from larger impurities but also from minute impurities and particularly from
germs.
For this purpose we prepare a number of long bags or tubes, closed at one end,
of textile fabric, felt or like porous material, and we lightly stretch these over
wire frames which have mouth pieces with holes through them. We fix these
mouth pieces to plates or partitions separating a chamber to which air is admitted
from a chamber in which the tubes are arranged so that air in passing from the
one chamber to the other has to pass through the pores of the fabric. There may
be in each case several thicknesses of fabric, and some of the tubes may be more
pervious so that the air may receive a preliminary filtration in passing through
them before passing through the others.
In order to effectually clear the air of germs we employ sterilised fabric, or,
after the tubes are fixed in place we sterilise them and the chamber containing
them by the application of steam or other source of heat.

page_text: Fig. 1 of the accompanying drawing is a vertical section illustrating one
arrangement of the filtering tubes which are in this case contained within a
cylindrical chamber A. By horizontal partitions this chamber is divided into
three compartments, a lower compartment B into which the air to be filtered enters
by an inlet I, the middle compartment containing the porous tubes P for preliminary,
and F for final filtration, and an upper compartment C with outlet O for the
filtered air. The mouths of the tubes P open to the compartment. B whilst those
of the tubes F open to C. Thus the air from B has to pass outwards through the
pores of the tubes P into the middle compartment, thence inwards through the
pores of the tubes F, and from these into the compartment C. A steam pipe S is
arranged in the compartment B for the purpose of drying the tubes after the
apparatus has been sterilised by steam. By a pipe W provided with a cock or
valve may be run off any moisture that may collect in the middle compartment.
The tubes P have flanged mouthpieces p which are bolted on the lower
partition 6; the tubes F have mouth pieces f with necks which pass through the
upper partition and have nuts N screwed on them.
In notches and holes in each mouth piece are held the hooked ends of six or
other number of wires or rods forming the frame on which the porous fabric is
stretched, as shewn by Fig. 2 which is a section drawn to an enlarged scale of one
of the mouth pieces f. The numbers dimensions and arrangement of the tubes
may obviously be varied.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
An air filter consisting of tubes made of porous fabric stretched on wire frames
each tube having at its one'end a mouth for admission or emission of air which
passes through the pores of the fabric, substantially as described.
Dated this 21st day of July 1893.
ABEL & IMRAY,
Agents for the Applicants.