IMPROVEMENTS IN REVOLVING STRAINERS EMPLOYED IN THE MANUFACTURE OF PAPER
Year: 1878

page_text: LETTERS PATENT to Thomas Blinkhorn Parke, of Withnell Fold, near Chorley,
in the County of Lancaster, Paper Maker, for the Invention of "IMPROVEMENTS
IN REVOLVING STRAINERS EMPLOYED IN THE MANUFACTURE OF PAPER."
Sealed the 19th July 1878, and dated the 25th April 1878.
PROVISIONAL SPECIFICATION left by the said Thomas Blinkhorn Parke
at the Office of the Commissioners of Patents on the 25th April 1878.
THOMAS BLINKHORN PARKE, of Withnell Fold, near Chorley, in the County of
Lancaster, Paper Maker. "IMPROVEMENTS IN REVOLVING STRAINERS EMPLOYED IN
THE MANUFACTURE OF PAPER."
This Invention relates to revolving knotter or strainer apparatus used for straining
pulp in the manufacture of paper, and particularly to the suction apparatus wherein
cylinders fixed to the interior of the revolving knotter or strainer frame are provided
with pistons or plates attached to a hollow shaft moving back wards and forwards within
the cylinders with a short quick stroke, the pistons or plates being of less diameter
than the cylinders, and leaving annular intervening spaces, the intervening spaces
being occupied by india-rubber rings or elastic diaphragms which allow of the
to-and-fro movement of the pistons, and also make water-tight joints as between
the cylinders and piston plates.
In practice the rapidity of the piston movement or vibration causes the india-
ubber rings rapidly to give way and become serrated or rough at the corners or
edges of the inner and outer joinings with the pistons or plates, and material collects
upon these roughened corners, and adheres thereto. This collected material, when
thrown off among the strained pulp, causes irregularities in the finished paper, and
is a source of annoyance and loss. To obviate this I form the rings or diaphragms
each with an annular bend or curvature in or opposite the space between the piston
plate and the cylinder. Thus the strain on the diaphragm joints is obviated, and
the rolling action of the curved portion of the ring formed by the bend or curvature
is substituted for the stretching of the india-rubber at each stroke of the piston.
[Price 6dı

page_text: One way of packing the closed end of each cylinder through which the piston
rod or shaft passes is by an ordinary stuffing box filled with any suitable material,
which is screwed down tight against the rod or shaft by an ordinary circular gland.
I employ a bell-mouthed sleeve of india-rubber, the larger or wide end of which is
slipped over the stuffing box and secured or bound thereto by copper wire or
suitable metal clips, the smaller or narrower end of the sleeve being similarly
secured to the piston rod. The elasticity of the india-rubber sleeve permits of the
to-and-fro movement of the piston rod at the same time that communication
between the gland and the interior of the revolving knotter is entirely cut off.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Blinkhorn Parke in the Great Seal Patent Office on the 23rd
October 1878.
THOMAS BLINKHORN PARKE, of Withnell Fold, near Chorley, in the County of
Lancaster, Paper Maker. "IMPROVEMENTS IN REVOLVING STRAINERS EMPLOYED IN
THE MANUFACTURE OF PAPER."
This Invention relates to revolving knotter or strainer apparatus used for straining
pulp in the manufacture of paper, and particularly to the suction apparatus wherein
cylinders fixed to the interior of the revolving knotter or strainer frame are provided
with pistons or plates attached to a hollow shaft moving backwards and forwards
within the cylinders with a short quick stroke, the pistons or plates being of less
diameter than the cylinders and leaving annular intervening spaces, the intervening.
spaces being occupied by india-rubber rings or elastic diaphragms which allow of
the to-and-fro movement of the pistons, and also make water-tight joints as between
the cylinders and piston plates.
In practice the rapidity of the piston movement or vibration causes the india-
rubber rings rapidly to give way and become serrated or rough at the corners or
edges of the inner and outer joinings with the pistons or plates, and material collects
upon these roughened corners, and adheres thereto. This collected material, when
thrown off among the strained pulp, causes irregularities in the finished paper, and
is a source of annoyance and loss. To obviate this I form the rings or diaphragms
each with an annular bend or curvature in or opposite the space between the piston
plate and the cylinder. Thus the strain on the diaphragm joints is obviated, and
the rolling action of the curved portion of the ring formed by the bend or curvature
is substituted for the stretching of the india-rubber at each stroke of the piston.
One way of packing the closed end of each cylinder through which the piston
rod or shaft passes is by an ordinary stuffing box filled with any suitable material,
screwed down tight against the rod or shaft by an ordinary circular gland, I
employ a bell-mouthed sleeve of india-rubber, the larger or wide end of which is
slipped over the stuffing box, and secured or bound thereto by copper wire or
suitable metal clips, the smaller or narrower end of the sleeve being similarly secured

page_text: to the piston rod. The elasticity of the india-rubber sleeve permits of the to-and-
fro movement of the piston rod at the same time that communication between the
gland and the interior of the revolving knotter is entirely cut off.
In the accompanying Drawing,-
Fig. 1 illustrates in section the application of my Invention to one of the
cylinders employed in a revolving strainer, as above described.
Fig. 2 is a front end view shewing the rings, elastic diaphragm, and other parts.
And Fig. 3 is a back end view.
a is the cylinder affixed to the knotter or strainer frame b in the usual manner;
c, the piston or plate fastened upon the hollow shaft d, perforated at d', as shown;
e, the elastic ring made with an annular curvature f, as shewn; g, gl, are rings.
The clastic ring e at its inner edge is compressed between the piston plate c and
the ring g by means of the screws h, and between the cylinder a and the ring g' by
the screws h¹. i represents the india-rubber sleeve secured to the shaft d, and to
the periphery of the bush j by ordinary metal clips and screw bolts k.
By the arrangement of sleeve, as above described, the gland and stuffing box, as
ordinarily employed, may be dispensed with, and a plain bushing j, as shewn, may
be substituted, thus materially reducing the friction and consequent wear and tear
upon the shaft d.
Having now described the nature of my said Invention, and the manner of
performing it, I would have it understood that what I consider to be novel and
original, and therefore claim as secured to me by the herein-before in part recited
Letters Patent is,―
1. The application and use, as and for the purpose herein-above specified, of a
ring or diaphragm having an annular curvature or bend, substantially as described,
and shewn in the accompanying Drawings.
2. The use or employment of the elastic sleeve, substantially as described and
shewn, for the purpose specified.
In witness whereof, I, the said Thomas Blinkhorn Parke, have hereunto set
my hand and seal, this Twenty-second day of October, in the year of our
Lord One thousand eight hundred and seventy-eight.
THOMAS R DARKE 101
THOMAS B PARKE
(L&)