Improvements in Machines for Separating and Collecting Dust from Air or other Gases.
Year: 1896

page_text: Date of Application, 22nd June, 1896
Complete Specification Left, 22nd Mar.: 1897-Accepted, 24th Apr., 1897
PROVISIONAL SPECIFICATION.
Improvements in Machines for Separating and Collecting Dust
from Air or other Gases.
We CHARLES EDWARD MUMFORD of St. Andrew's Works Bury St.. Edmunds,
in the County of Suffolk, Engineer and WILLIAM WALTER WILLIS of
Duncombe Burrell Street Ipswich in the County of Suffolk Miller, do hereby
declare the nature of this invention to be as follows:-
This invention relates to an improved machine for separating and collecting
dust from air, or other gases.
Our present invention is applicable to all kinds of grain cleaning machines, or to
middlings purifiers, in which blast or exhaust air currents are used, also to exhausts
from roller mills, or stones, and other grinding machinery.
The invention consists of a double perforated cylinder enclosed at the ends by a
diaphragm fitted with a suitable inlet for charging the cylinder with the filtering
material, which may be grain or seeds of any suitable description such as wheat,
oats, or barley, or broad bran, or chopped straw, or even coarse sawdust may be
used, or any other suitable material which experience may suggest that: is capable
of retaining the dust while allowing the air to escape through the perforated
cylinder.
The said cylinder is fitted into a suitable frame mounted upon rollers or other
means to which motion is imparted by belt or other gear.
The inner cylinder is closed at the ends by a circular disc which is fixed to the
framework and round which the cylinder revolves. A deflector running the whole
length of the cylinder is attached to the top of the said dises to prevent the air
making a short cut through the top of the cylinder where the filtering material
would not be sufficiently thick to prevent the escape of dust. The space between
the inner & outer cylinder is filled about seven eighths full with the filtering
material this is to allow the said material to continually change its position as the
cylinder slowly revolves whereby the dust which is blown or exhausted into the
inner cylinder gradually sifts through the perforations into the filtering material
and through the said material and the outer perforations into the collecting
chamber provided underneath the cylinder; an aperture of suitable dimensions
is cut into the stationary disc at one end of the machine (or in some cases we may
use both ends) into which is fitted the trunk or spout through which the dust laden
air is blown or exhausted through, the machine.
In some cases we divide the inner cylinder into a series of compartments by
means of diaphragms with circular openings gradually diminishing in size towards
the end of machine or in the case of double machines towards the central
diaphragm which is unperforated.
In this way we insure a proper distribution of the air through the machine.
Suitable brushes are provided for keeping the meshes clean in the inner & outer
cylinder; in some cases we also provide a knocker by which a slight vibration is
imparted to the cylinder which materially assists the dust to sift out at the lower
portion of the cylinder while the air escapes through the sides above the line where
sifting ceases.
The lower portion of the machine frame is close boarded and forms a dust tight

page_text: chamber in which a conveyor of any well known form is provided for collecting
and discharging the dust.
The purified air escapes out of the machine through a perforated top cover or it
may be led away by trunking to any desired point of discharge.
Dated this 19th day of June 1896.
CHARLES EDWARD MUMFORD.
WILLIAM WALTER WILLIS.
Improvements in Machines for Separating and Collecting Dust
from Air or other Gases.
We CHARLES EDWARD MUMFORD of St. Andrew's Works Bury St. Edmunds
in the County of Suffolk Engineer and WILLIAM WALTER WILLIS of
"Duncombe "Burrell Street Ipswich in the County of Suffolk Miller 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 an improved machine for separating and collecting
dust from air, or other gases.
Our present invention is applicable to all kinds of grain cleaning machines, or
to middlings purifiers, and other machinery in which blast or exhaust air currents
are used; also to exhaust from roller mills, or stones, and other grinding
machinery.
The invention consists of a double perforated cylinder enclosed at the ends by a
diaphragm and fitted with a suitable inlet for charging the cylinder with filtering
material, which may be grain, or seeds of any suitable description such as wheat,
oats or barley, or broad bran or chopped straw, or even coarse sawdust may be
used or any other suitable material which experience may suggest that is capable
of retaining the dust while allowing the air to escape through the perforated
cylinder.
The said cylinder is fitted into a suitable frame and mounted upon rollers to
which motion is imparted by meaus of a belt or other gear. The inner cylinder is
closed at the ends by a circular disc which is fixed to the framework and round
which the cylinder revolves. A deflector running the whole length of the cylinder
is attached to the top of the said discs to prevent the air making a short cut
through the top of the cylinder where the filtering material would not be
sufficiently thick to prevent the escape of dust. The space between the inner and
outer cylinder is filled about seven-eighths full with the filtering material this is
to allow the said material to continually change its position as the cylinder slowly
revolves whereby the dust which is blown or exhausted into the inner cylinder
gradually sifts through the perforations into the filtering material and through the
said material and the outer perforations into the collecting chamber provided
underneath the cylinder.
An aperture of suitable dimensions is provided in the stationary disc at one end
of the machine (or in some cases we may use both ends) into which is fitted the
trunk or spout through which the dust laden air is blown or exhausted through the
machine.
In some cases we divide the inner cylinder into a series of compartments by
means of diaphragms with circular openings gradually diminishing in size towards
the end of machine, or in the case of double machines towards the central
diaphragm which is unperforated.
In this way we insure a proper distribution of the air through the machine."

page_text: Suitable brushes are provided for keeping the meshes clean in the inner aud
outer cylinder, in some cases we also provide a knocker by which a slight vibration
is imparted to the cylinder which materially assists the dust to sift out at the lower
portion of the cylinder while the air escapes through the sides above the line
where sifting ceases. The lower portion of the machine frame is close boarded
and forms a dust tight chamber in which a conveyor of any well known form is
provided for collecting and discharging the dust.
The purified air escapes out of the machine through a perforated top cover or it
may be led away by trunking to any desired point of discharge.
In some cases we prefer to exhaust the air from the outer to the inner cylinder
in such cases the inner cylinder is connected to the suction side of the fan or
fans. This is always necessary when the machine is treating the air from grain
cleaning machines or when the air to be purified contains large or solid
substances.
I will now proceed to describe a machine constructed according to our invention
having reference to the accompanying drawings in which
Fig. 1 is a longitudinal vertical section and
Fig. 2 a transverse section on the lines A. B.
Referring to Fig. 1 A is the framework and casing of the machine. B the air
inlet and discharge respectively (being interchangable according to the require-
ments of the case). C is the double perforated cylinder. C the material for
separating the dust from the air passing through the machine. D the rollers and
supporting spindles upon which the cylinder revolves. E brushes for keeping the
meshes or perforations clean. F the dust hopper. G collecting worm. H driving
pulley and gear for setting in motion the above-mentioned parts. H* a door or
movable section of the cylinder for filling or changing the filtering material.
Like reference letters are used on the like parts in the transverse section
Fig. 2.
Having now particularly described and ascertained the nature of our invention
and the manner in which the same is to be performed I declare that what we
claim is:
1. The double cylinder made with material of perforated or woven mesh and
having a space between the two said perforated cylinders into which material is
placed for separating the dust and other matter from the air passing through the
said perforations. The cylinder being placed upon rollers and revolved in such a
manner that the dust caught in the filtering material is again dressed out through
the meshes or perforations of the outer cylinder into the dust hopper substantially
as described.
2. In combination with the double perforated cylinder. The brushes for keeping
the meshes or perforations open. The air conduits to and from the cylinder and
the apparatus for setting in motion the moving parts constructed and arranged for
separating and collecting dust from air or other gases substantially as described
and illustrated in the drawings annexed.
Dated this 20th day of March 1807
CHARLES EDWARD MUMFORD,
WILLIAM WALTER WILLIS,
Applicants.