IMPROVEMENTS IN PULP STRAINERS OR KNOTTER BOTTOMS
Year: 1862

page_text: LETTERS PATENT to Henry Watson, of Newcastle-upon-Tyne, Engineer,
and Joseph Millbourn, of Dartford, in the County of Kent, Paper Manu-
facturer, for the Invention of "IMPROVEMENTS IN PULP STRAINERS OR
KNOTTER BOTTOMS."
Sealed the 11th November 1862, and dated the 31st May 1862.
PROVISIONAL SPECIFICATION left by the said Henry Watson and Joseph
Milbourn at the Office of the Commissioners of Patents, with their
Petition, on the 31st May 1862.
We, HENRY WATSON, of Newcastle-upon-Tyne, Engineer, and JOSEPH
MILLBOURN, of Dartford, in the County of Kent, Paper Manufacturer, do
hereby declare the nature of the Invention for "IMPROVEMENTS IN PULP
STRAINERS OR KNOTTER BOTTOMS," to be as follows:-
This Invention has for its object improvements in pulp strainers, or knotter
bottoms, and is applicable to such as are composed of a series of bars with
spaces between them in contradistinction to those in which the requisite
spaces are produced by cutting or forming slits in plates. The peculiarity of
the Invention consists in this, that whereas when heretofore constructing a
pulp strainer or knotter bottom with bars, such bars have been combined into
one complete knotter bottom, which in case any part of it became defective,
had to be removed; according to the present improvements a pulp strainer or
knotter bottom is composed in a series of sections or panels, each formed of
a number of bars which are combined by screw bolts, and nuts, or other

page_text: fastenings; several of these sections or panels are placed and retained securely
in a suitable frame, and in this manner is a pulp strainer or knotter bottom
produced, which will admit of any one or more of the sections or panels
being readily removed in case of their being defective, and of other similar
sections or panels being introduced into the frame in place thereof, and such
construction also offers the further advantage that when it is desired to change
the pulp strainer or.knotter. bottom for a finer or coarser. one, then the several
sections or panels of the one previously in use may be removed, and proper
sections or panels of another gauge introduced, which is more readily done
than changing a knotter bottom not so made in sections.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Henry Watson and Joseph Milbourn in the Great Seal
Patent Office on the 29th November 1862.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, HENRY
WATSON, of Newcastle-upon-Tyne, Engineer, and JOSEPH MILLBOURN, of
Dartford, in the County of Kent, Paper Manufacturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirty-first day of May, in the year of our Lord
One thousand eight hundred and sixty-two, in the twenty-fifth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us, the
said Henry Watson and Joseph Millbourn, Her special licence that we, the
said Henry Watson and Joseph Millbourn, our executors, administrators, and
assigns, or such others as we, the said Henry Watson and Joseph Millbourn,
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 "IMPROVEMENTS IN
PULP STRAINERS OR KNOTTER BOTTOMS," upon the condition (amongst others)
that we, the said Henry Watson and Joseph Milbourn, our executors or
administrators, by an instrument in writing under our or their hands and
seals, or under the hand and seal of, one of us, or them, 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.

page_text: NOW KNOW YE, that I, the said Joseph Millbourn, on behalf of myself
and the said Henry Watson, do hereby declare the nature of the said Inven-
tion, 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 pulp strainers or knotter
bottoms, and is applicable to such as are composed of a series of bars with
spaces between them, in contradistinction to those in which the requisite spaces
are produced by cutting or forming slits in plates. The peculiarity of the
Invention consists in this, that whereas when heretofore constructing EL pulp
strainer or knotter bottom with bars, such bars have been combined into one
complete knotter bottom, which in case any part of it became defective had
to be removed; according to the present improvements a pulp strainer or
.knotter bottom is composed in a series of sections or panels, each formed of
a number of bars, which are combined by screw bolts and nuts or other fasten-
ings. Several of these sections or panels are placed and retained securely
in a suitable frame, and in this manner is a pulp strainer or knotter bottom
produced which will admit of any one or more of the sections or panels being
readily removed in case of their being defective, and of other similar sections
or panels being introduced into the frame in place thereof; and such construc-
tion also offers the further advantage that when it is desired to change the
pulp strainer or knotter bottom for a finer or coarser one then the several
sections or panels of the one previously in use may be removed and proper
sections or panels of another gauge introduced, which is more readily done:
than changing a knotter bottom not so made in sections.
And in order that our said Invention may be most fully understood, and
readily carried into effect, we will proceed to describe the Drawings- hereunto
annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plan, full size, of a portion of a panel or division of a knotter
bottom constructed as above described; Figures 2 and 3 are sections taken
respectively at the lines A, B, and C, D, of Figure 1. a, a, are bars by
preference of brass carefully shaped as the Drawing shews: each bar has a

page_text: for straining the pulp; at the centre also of the bars they rest the one against the
other to keep the spaces or slits the more accurately to the gauge required.
The bars may be made parallel from end to end and spaced by means of strips
of metal placed between them, and this is a cheaper arrangement, but that
shewn in the Drawing we consider to be preferable; Figure 4 is a plan;
Figure 5 a side view; Figure 6 a longitudinal, and Figure 7 a transverse
section of a frame suitable to receive several panels such as above described,
so as to form a knotter bottom. The frame is rectangular and made of iron
plate rolled with a rib upon it; these plates are marked c. Along the centre
of the frame a bar d runs, this bar is flat at the top and serves in conjunction
with the ribs on the plate c to support the panels which in the Drawing are
marked e. The panels are held down in their places all round the edges of
the frame by strips f, f, attached to the plate c, c, by means of tap screws, and
the panels are held down on to the central bar d by an upper bar or beam of
cast iron g, which has a series of legs descending from it and resting at intervals
on the panels. This upper bar or beam g is connected with the lower bar d
by bolts at intervals; the heads of the bolts are countersunk into the lower bar,
and the stem of the bolt passes up one of the legs of the bar or beam
g and
receives a nut at the top; the panels are notched where necessary to allow
the bolts to pass; h, h, are lugs attached to the plate c; they are used to secure
the knotter bottom to the frame which supports it; i, i, are rings to facilitate
the lifting of the knotter plate.
The arrangements above described admit of any one of the panels being
readily removed and replaced by another when required.
The form of the frame for receiving the panels of the knotter bottom
will be varied according to the number of panels it is intended to take.
In witness whereof I, the said Joseph Millbourn, have hereunto set
my hand and seal, this Twenty-ninth day of November, in the year
of our Lord One thousand eight hundred and sixty-two.
JOSEPH MILLBOURN. (L.S.)