Plates for Oil and other Presses.
Year: 1890

page_text: Date of Application, 19th June, 1890
Complete Specification Left, 26th Mar., 1891-Accepted, 9th May, 1891
PROVISIONAL SPECIFICATION.
Plates for Oil and other Presses.
I, WILLIAM CAREY LEECHMAN of Colombo in the Island of Ceylon,
Merchant, do hereby declare the nature of this invention to be as follows:-
Attempts hitherto made to introduce drainage on the surface of press plates has
met with little success especially when high pressures have been used owing to the
clogging of the presses and the damage to the cloths. The object of my invention
is to obviate these objections.
To facilitate free discharge of the liquid I introduce an extra plate grooved on
one surface with holes leading from the grooves to the ungrooved surface which is
covered with a cloth. This arrangement acts well for moderate pressures of say
half a ton to the square inch, but when high pressures are employed the smallest holes
which can conveniently be made in a comparatively thick plate are too large for
the purpose and clogging and damage to the cloths results. To overcome this I
throttle the orifices of the holes next the cloth. I also employ rings with inclined
surfaces around the plates to prevent the material being pressed from escaping from
between the plates.
Dated this 19th day of June 1890.
CARPMAEL & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Plates for Oil and other Presses.
I WILLIAM CAREY LEECHMAN of Colombo in the Island of Ceylon,
Merchant, 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 that class of press in which the solid material to be
pressed is placed between plates which are then forced towards each other the
liquid expressed escaping at the outer surface of the material.
Attempts hitherto made to introduce drainage on the surface of the press plates
has met with little success especially when high pressures have been used owing to
the clogging of the presses and the damage to the cloths. The object of my
invention is to obviate these objections.
To facilitate free discharge of the liquid I introduce an extra plate grooved on
one surface with holes leading from the grooves to the ungrooved surface which is
covered with a cloth. This arrangement acts well for moderate pressures of say
half a ton to the square inch, but when high pressures are employed the smallest
holes which can conveniently be made in a comparatively thick plate are too large
for the purpose and clogging and damage to the cloth results. To overcome this I
throttle the orifices of the holes by applying on the side next the cloth a thin
covering plate with similarly arranged but much finer perforations I also employ
rings with inclined surfaces around the plates to prevent the material being pressed
from escaping from between the plates.
Figure 1 is a vertical section of a part of a press fitted with plates made
according to my invention.
Figure 2 is a horizontal section on a smaller scale of the press with the top cloth
removed.

page_text: Figure 3 is an underside view of part of one of the grooved and perforated
plates, and Figure 4 is a plan of part of one of the finely perforated upper plates.
Figure 5 is a vertical section of a modified plate.
AA are the plain press plates as now commonly used-B B are grooved and
perforated plates-C C are finely perforated plates which lie on the top of the
plates B-DD are cloths which are placed on the plates C and also above the
material to be pressed-E E are rings with an inclined surface which may either
be loose or be fixed to the plates B and preferably also to the plates A which serve
to prevent the material being pressed from spreading outwards-F F are the guides
of the press.
In Figure 5 a separate plate C having a central perforation is placed in a recess
above each of the holes in the plate B, but in most cases the arrangement shewn in
Figure is preferable.
The details of the press are not shewn in the drawings as these are old and well
understood.
In place of the face of the plate A next to the plate B being plain it may be
grooved or channelled in which case the grooves or channels in the face of the
plate B may be omitted.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I would state I am aware
that a grooved and perforated plate covered on one side with cloth has before
been proposed and I therefore make no claim to such an arrangement but what I
claim is
1. In oil and similar presses the combination consisting of an unperforated plate;
a plate having perforations in one face opening into grooves at the other face:
another plate with corresponding but finer perforations; and a cloth; these several
parts being arranged one against the other in the order named.
2. In oil and similar presses the combination consisting of an unperforated plate;
a plate grooved on one face and perforated on the other the perforations communi-
cating with the grooves; another plate with corresponding but finer perforations;
and a cloth; these several parts being arranged one against the other in the order
named.
3. In oil and similar presses the combination consisting of an unperforated plate;
a plate with perforations leading into delivery channels; a cloth covering the
perforations and a ring with an inclined surface confining the material between the
plates.
4. In oil and similar presses the combination consisting of an unperforated plate;
a plate having perforations in one face opening into grooves at the other face;
another plate with corresponding but finer perforations and a cloth placed one
against the other in the order named and a ring with an inclined surface confining
the material between the plates.
Dated this 26th day of March 1891.
CARPMAEL & Co.,
Agents.