IMPROVEMENTS IN ROTARY CAR זוז מזר!
Year: 1875

page_text: LETTERS PATENT to Henry Brinsmead, of Ipswich, in the County
of Suffolk, Machinist, for the Invention of "IMPROVEMENTS IN ROTARY
CAR
זוז מזר!
ADDADANOSTO
ΠΑΝΤΙ ΑΞΙΟΝ ΠΠεηηπτης 19
Sealed the 16th March 1875, and dated the 12th January 1875.
PROVISIONAL SPECIFICATION left by the said Henry Brinsmead at
the Office of the Commissioners of Patents, with his Petition, on
the 12th January 1875.
-
I, HENRY BRINSMEAD, of Ipswich, in the County of Suffolk, Machinist,
do hereby declare the nature of the said Invention for "IMPROVEMENTS IN
ROTARY SCREENS AND IN APPARATUS IN CONNECTION THEREWITH," to be as
follows:-
This Invention has for its object improvements in rotary screens. I
construct the screen. cylinder of several helices of wire varying in
number according to the diameter of the cylinder, and attach the several
helices to a suitable number of spiral springs mounted upon supporting
bars attached to cast-iron heads after the manner of the screen known as
Penney's screen.

page_text: My object in employing a number of helices is to form with the wires
of the screen cylinder a perfect screw, the pitch of which is to be
determined by the number of. helices employed. For example, if I
employ five helices and the adjacent wires are of an inch from centre
to centre, the pitch of each helix will be 14 inch, and a screen cylinder
thus composed of five helical wires will form a perfect five-threaded
screw.
For cleaning this screen cylinder I apply a revolving expanding screw
cleaner, which I construct by preference of wire of a T section, coiled
and mounted upon a shaft or axis, the diameter and pitch of the cleaner
having a fixed proportion to the diameter, pitch, and number of sup-
porting bars and springs in the screen cylinder. The shaft or axis of
the cleaner is mounted in a position parallel with the axis of the screen
cylinder and outside this cylinder.
To illustrate my principle I will suppose the screen cylinder to be
17 inches in diameter, with five helices of wire, and 10 supporting bars.
and springs, then at each revolution of the screen cylinder the wires will
travel 1inch, therefore the rotary cleaner must be a single threaded
screw of one-fifth the pitch of the helices, one-fifth of the diameter of
the screen cylinder, and must revolve five times to one revolution of the
screen cylinder. When the helices of the screen cylinder are made like
a left-handed screw the screw of the cleaner must be right handed, and
vice versa. The axis of the screw cleaner is connected with the axis of
the screen cylinder by a wheel and pinion of proper proportions to give
the relative number of revolutions, and the screw cleaner is so mounted
that the screw enters a short distance into the spaces between the wires
of the screen cylinder, and thus the whole of the spaces between the
wires of the screen cylinder will be cleaned at each revolution. And in
order that the revolving expanding cleaner may follow the various
adjustments of the screen I attach each end of the screw to a disc, and
form a groove in each of the cast-iron heads of the screen for the said
discs to run in. The disc next to the fixed end of the screen cylinder is
fixed to the axis of the cleaner; the other disc slides along the axis,
therefore the movable end of the screen cylinder will expand and
contract the screw of the cleaner än like proportion to the expanding
and contracting of the helices of the screen cylinder.

page_text: especially adapted for screens which have their springs and supporting
bars in the interior of the helices.
For screens which have their springs and supporting bars on the
exterior I form the screw of the cleaner sufficiently deep to admit of
notches being cut to clear the springs of the screen cylinder as they
revolve under the cleaner.
In some cases I clean one half only of the spaces between the wires of
the screen cylinder at each revolution, and this I effect by forming the
screen cylinder with an odd number of springs and supporting bars, and
by so proportioning the pitch and number of revolutions of the rotary
cleaner and the helices of the screen cylinder that the screw of the
cleaner enters the alternate spaces only between the wires of the screen
cylinder, and makes a half turn in its number of revolutions, by which
device the screw of the cleaner will at each revolution of the screen
cylinder fall into and clean a different set of spaces between the wires.
The arrangements for allowing the rotary screw cleaner to follow the
adjustments of the screen are similar to those above described.
I construct screen cylinders, in which the wires are fixed, also of
several helices, as above described, and clean them by means of a rotary
cleaner with a single helical cleaning rib upon it; or in either case
the cleaner may be a double-threaded helix, whilst the screen cylinder
many threaded.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Henry Brinsmead in the Great Seal Patent Office
on the 10th July 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HENRY
BRINSEAD, of Ipswich, in the County of Suffolk, Machinist, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twelfth day of January, in the year
of our Lord One thousand eight hundred and seventy-five, in the thirty-
cighth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Henry. Brinsmead, Her special license
,

page_text: that I, the said Henry Brinsmead, my executors, administrators, and
assigns, or such others as I, the said Henry Brinsmead, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
ROTARY SCREENS AND IN APPARATUS IN CONNECTION THEREWITH," upon the con-
dition (amongst others) that I, the said Henry Brinsmead, my executors
or administrators, by an instrument in writing under my, or their, or one
of their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be
performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the date
of the said Letters Patent.
NOW KNOW YE that I, the said Henry Brinsmead, do hereby declare
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the
following statement thereof, that is to say :-
This Invention has for its object improvements in rotary screens. I
construct the screen cylinder of several helices of wire varying in
number, according to the diameter of the cylinder, and attach the several
helices to a suitable number of spiral springs mounted upon supporting
bars attached to cast-iron heads, after the manner of the screen known
as Penny's screen.
My object in employing a number of helices is to form with the wires.
of the screen cylinder a perfect screw, the pitch of which is to be
determined by the number of helices employed. For, example, if I
employ five helices, and the adjacent wires are of an inch from centre
to centre, the pitch of cach helix will be 1 inch, and a screen cylinder
thus composed of five helical wires will form a perfect five-threaded
screw.
For cleaning this screen cylinder I apply a revolving expanding screw
cleaner, which I construct by preference of wire of a T section, coiled
and mounted upon a shaft or axis, the diameter and pitch of the cleaner
having a fixed proportion to the diameter, pitch, and number of sup-
porting bars and springs in the screen cylinder. The shaft or axis of the

page_text: cleaner is mounted in a position parallel with the axis of the screen
cylinder and outside this cylinder.
To illustrate my principle I will suppose the screen cylinder to be
17 inches in diameter, with five helices of wire and 10 supporting bars
and springs, then at each revolution of the screen cylinder the wires will
travel 1 inch, therefore the rotary cleaner must be a single-threaded
screw of one-fifth the pitch of the helices, one-fifth of the diameter of the
screen cylinder, and must revolve five times to one revolution of the screen
cylinder. When the helices of the screen cylinder are made like a left-
handed screw the screw of the cleaner must be right handed, and vice
versa. The axis of the screw cleaner is connected with the axis of the
screen cylinder by a wheel and pinion of proper proportions to give the
relative number of revolutions, and the screw cleaner is so mounted that
the screw enters a short distance into the spaces between the wires of
the screen cylinder, and thus the whole of the spaces between the wires
of the screen cylinder will be cleaned at each revolution. And in order
that the revolving expanding cleaner may follow the various adjustments
of the screen I attach each end of the screw to a disc, and form a groove
in each of the cast-iron heads of the screen for the said discs to run.in.
The disc next to the fixed end of the screen cylinder is fixed to the axis
of the cleaner; the other disc slides along the axis, therefore the
moveable end of the screen cylinder will expand and contract the screw
of the cleaner in like proportion to the expanding and contracting of the
helices of the screen cylinder.
The construction of the rotary cleaner above described is more
especially adapted for screens which have their springs and supporting
bars in the interior of the helices.
For screens which have their springs and supporting bars on the
exterior I form the screw of the cleaner sufficiently deep to admit of
notches being cut to clear the springs of the screen cylinder as they
revolve under the cleaner.
In some cases I clean one half only of the spaces between the wires
of the screen cylinder at each revolution, and this I effect by forming
the screen cylinder with an odd number of springs and supporting bars,
and by so proportioning the pitch and number of revolutions of the
rotary cleaner and the helices of the screen cylinder that the screw of
the cleaner enters the alternate spaces only between the wires of the

page_text: will always be the same distance apart as the wires of the screen, and
thus always be in position to insert themselves between the wires of the
screen.
I have shown on the Drawings my cleaner adapted to cleaning one
half the screen at each revolution of the screen. When I clean the
whole at each revolution of the screen I simply introduce another coil
into the cleaner, making it a double-threaded screw; or I make a single
coil of half the pitch, and adapt the wire helices of the screen thereto,
as previously described.
I have above described the coiled springs for the cleaner as formed of
wire of a T section, but I sometimes otherwise form it of two ordinary
round wires with metal plates soldered between them.
Having now described the nature of my Invention and the manner of
performing the same, I would have it distinctly understood that I do not
limit myself to the precise arrangements herein described and shewn on
the Drawings, but what I claim as my Invention is,―
Firstly. Making a screen of several wires forming a multiple-threaded
screw, and adapting thereto a rotary cleaner likewise formed as a single
or multiple-threaded screw, and arranged so that when revolving the
screw of the cleaner shall pass between the wires of the screen, sub-
stantially as described.
Secondly. Where the screen is adjustable, making the spiral of the
rotary cleaner to elongate and contract to adapt itself to the adjustment
of the screen, substantially as described.
In witness whereof, I, the said Henry Brinsmead, have hereunto
set my hand and seal, this Twenty-ninth day of June, in the
year of our Lord One thousand eight hundred and seventy-
five.