CERTAIN Tarananmunuma 1 ADDADATHER FOR STRAINING PAPER PULP
Year: 1869

page_text: LETTERS PATENT to George Bertram, of Edinburgh, in the County of
Mid Lothian, North Britain, and Michael Patterson, of Ivy Bridge,
in the County of Devon, Engineers, for the Invention of "CERTAIN
Tarananmunuma 1 ADDADATHER FOR STRAINING PAPER PULP."
Scaled the 18th March 1870, and dated the 27th November 1809.
PROVISIONAL SPECIFICATION left by the said George Bertram and
Michael Patterson at the Office of the Commissioners of Patents,
with their Petition, on the 27th November 1869.
We, GEORGE BERTRAM, of Edinburgh, in the County of Mid Lothian,
North Britain, and MICHAEL PATTERSON, of Ivy Bridge, in the County
of Devon, Engineers, do hereby declare the nature of the said Invention
of "CERTAIN IMPROVEMENTS IN APPARATUS FOR STRAINING PAPER PULP," to be
as follows, that is to say :-
This Invention relates to the employment in connection with the vat
which contains the revolving knotter used in some paper machines, of a
pipe fitted with a cock or valve leading to the ordinary or horizontal
knotter, the object of which is to clean the pulp in the vat and prevent

page_text: the knotter revolving therein from becoming choked, and also for
reducing the strain on the bellows inside the revolving knotter. The
pulp in the vat being kept in continual agitation by the revolving
knotter, it causes the knots, dirt, and other refuse to be driven towards
the pipe herein-before referred to, which passing through the cock or
valve enters the horizontal knotter where the knots, dirt, and refuse mix
with as much of the back water as is necessary, the remaining portion
of the back water running into the back water box, where it meets that
which has passed through the knotter, after which the whole is pumped
or lifted up sufficiently high to flow into the mixing box at the head of
-the machine.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Bertram and Michael Patterson in the
Great Seal Patent Office on the 20th May 1870.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, GEORGE
BERTRAM of Edinburgh, in the County of Mid Lothian, North Britain,
and MICHAEL PATTERSON, of Ivy Bridge, in the County of Devon,
Engineers, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of November, in
the year of our Lord One thousand cight hundred and sixty-nine, in
the 33rd year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said George Bertram and Michael Patterson,
Her special license that we, the said George Bertram and Michael
Patterson, our executors, administrators, and assigns, or such others as
we, the said George Bertram and Michael Patterson, our 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 "CERTAIN IMPROVE.
MENTS IN APPARATUS FOR STRAINING PAPER PULP," upon the condition
(amongst others) that we, the said George Bertram and Michael
Patterson, by an instrument in writing under our hands and seals,
should particularly describe and ascertain the nature of the said In-

page_text: vention, 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 we, the said George Bertram and Michael
Patterson, do hereby declare the nature of our said Invention, and in
what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, reference being had
to the accompanying Drawings, and to the letters and figures marked
thereon, that is to say :-
Our said Invention relates to the employment in connection with the
vat which contains the revolving knotter used in some paper machines,
of a pipe fitted with a cock or valve leading to the ordinary or horizontal
knotter, the object of which is to clean the pulp in the vat and prevent
the knotter revolving therein from becoming choked, and also for
reducing the strain on the bellows inside the revolving knotter. The
pulp in the vat being kept in continual agitation by the revolving
knotter it causes the knots, dirt, and other refuse to be driven towards
the pipe herein-before referred to, which passing through the cock or
valvo enters the horizontal knotter, where the knots, dirt, and other
refuse mix with as much of the backwater as is necessary, the remaining
portion of the back water running into the back water box, where it
meets that which has passed through the knotter, after which the whole
is pumped or lifted up sufficiently high to flow into the mixing box at
the head of the machine.
And in order that our said Invention may be properly understood we
now proceed more particularly to set forth the system, mode, or manner.
in or under which the same is or may be used or practically carried into.
effect, that is to say :-
On the Sheet of Drawings hereunto appended Figure 1 is a plan, and:
Figure 2 an end elevation at A, Figure 1, of some portions of paper-.
making mechanism showing our improved knotting apparatus as applied
to the revolving strainers of such machines. On these Figures. corre-
sponding parts are indicated by the same letters of reference..
The improved apparatus consists of a pipe A fitted with a cock or
valve B leading from the pulp vat C to a horizontal knotter D. The
pipe A is by preference attached to the bottom of the vat O, but it may

page_text: also be attached to the side of the vat, or in any other suitable position.
The pulp in the vat C is kept in continual agitation by the revolving
strainer E, which strainer is rotated by the spur wheel F, situated on the
journal at one end of the strainer, as shown at Figure 1. The spur
wheel F is actuated by a corresponding pinion G rotated by the, bevil
gearing H, which gearing communicates with a steam engine or other
prime mover, or the revolving strainer may be otherwise actuated. The
revolution of the strainer E and the opening of the cock B causes the.
knots, dirt, and other refuse to be drawn through the pipe A, and these
passing through the cock or valve B of the pipe enter the horizontal
knotter D, which knotter is of the ordinary construction, and is actuated
by the cams; these cams being caused to revolve by means of the band
or belt passed over a pulley situated on the shaft of the cams, and also
over a pulley on the driving shaft I: The knots and other refuse having
passed into the knotter D, they are mixed with a quantity of water,
and thereafter conveyed along the duct or passage J to the back water
well or box K, as shown at Figure 1. The water necessary for cleansing
the pulp in the knotter D is conveyed thereto by a passage or duct E
from a "save-all" M, and any water not necessary for the cleansing of
the pulp which may be admitted to the passage or duct L is led through
a sluice or valve N into a branch passage O, and thence into the well or
box K hercin-before mentioned, where it mingles with the pulp conveyed
thither from the knotter D through the passage J. The material in the
well or box K is pumped or otherwise lifted up to a sufficient height to
flow into the mixing box at the head of the machine (which box is not
shown on the Drawings) where it is mixed with fresh pulp and caused
to pass again into the vať C. The pulp which is sufficiently fine for
the manufacture of the paper flows through the openings or apertures
in the plates which form the outer casing into the interior of the
strainer E, from whence it is conducted through the journal a of the
strainer, which journal is formed hollow for that purpose, into a box or
vat P placed to receive it, and from thence it is conveyed through the
pipe into the vat or tank R, from which vat or tank it flows on to
the travelling wire cloth S, seen at Figure 2, and conveyed through the
paper machine. The water which flows from the pulp on the travelling
wire cloth S falls into the " save-all" M, and is thence conveyed into
the box or well K, as herein-before described. Any particles of pulp
which may adhere to the outside of the strainer E in the course of its
revolutions and thereby tend to stop up or choke the apertures in the

page_text: strainer are blown therefrom by bellows situated in the interior of the
strainer, which bellows are of similar construction to those employed in
existing arrangements of the apparatus for straining pulp; such, for
example, as in the paper-making mechanism specified under Letters
Patent granted to George Bertram and William M'Niven, bearing date
the 4th day of February 1858, and numbered 209, and the bellows are
actuated by the stop pulley V through the intervention of the rod U,
they may be otherwise actuated.
In lieu of conducting the knots and other refuse direct from the
revolving strainer E by the pipe A into the knotter D, as hercin-before
set forth, these knots may be led to a second revolving strainer of
similar construction to the first, and thence into the knotter, or they
may be treated in any other suitable manner, it being understood that we
do not confine ourselves to the particular arrangement or construction
of mechanism herein-before described and shown on the accompanying
Sheet of Drawings, as such mechanism may be modified.
Having now described the nature of our said Invention, and the
system, mode, or manner in or under which the same is or may be used
or practically carried into effect, we would observe in conclusion, that
what we consider novel and original, and therefore claim as the Inven-
tion secured to us by the herein-before in part recited Letters Patent is,
the application of a pipe or pipes provided with a cock or valve to the
vat of the revolving strainer, and preferably to the bottom of said vat,
as and for the purposes herein-before set forth, or any mere modification
thereof.
In witness whereof, I, the said George Bertram, on behalf of