Improvements in and connected with Press Boxes Used for Expressing Oils.
Year: 1895

page_text: Date of Application, 1st June, 1895
Complete Specification Left, 2nd Mar., 1896-Accepted, 18th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in and connected with Press Boxes Used for
Expressing Oils.
I, GEORGE MITCHELL of 47 Victoria Street Westminster, in the County of
London, Consulting Engineer, do hereby declare the nature of this invention to
be as follows:-
In horizontally disposed presses the press boxes in which castor beans, olives,
and the like are enclosed during the expression of the oil which they contain, are
in general closed in on the sides and bottom only, leaving the top open for the
insertion of the beans, nuts, seeds, or fruit. It is found in practice that when
pressure is applied and before the friction due to such pressure is sufficient to
retain the material, a considerable quantity is forced out through the space left
open, thus reducing the possible working capacity of the box.
Now in this invention in addition to the flanges which close the sides, and the
removable plate which closes the bottom, I attach a lip or flange to the upper
edge of one of the plates which form the press box, and form a corresponding
recess or groove in the other plate, in such manner that when the boxes are
opened to the full extent, the lip and recess are far enough apart to allow of the
nuts, seeds, or the like being dropped or fed in. But when the plates are forced
together, the lip or flange reaches the edge of the recess and closes the top of the
press box before the pressure upon the contents has become great enough to
express the oil. A very small space is left open, sufficient to direct the oil into
the groove, from whence it passes through specially arranged passages to the press
channels.
I shape the upper or removable plate and the sole plate with sloping edges in
such manner as to secure the flowing of the oil into the channels, when the upper
plate is removed.
In some cases I attach a scraper or scrapers to the sole plate so that when the
removable plate slides back any oil which has adhered to it is scraped into the
channels.
D
T
1002
W. J. MUNDEN,
106 Priory Park Road, Kilburn, London, N.W.,
Agent for the Applicant.
Improvements in and connected with Press Boxes Used for
.Expressing Oils.
I, GEORGE MITCHELL, of 47 Victoria Street, Westminster, in the County of
London, Consulting Engineer, 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 :-
In horizontally disposed presses, the press boxes in which castor, beans, olives
ΓΥ

page_text: and the like are enclosed during the expression of the oil which they contain, are
in general closed in on the sides and bottom only, leaving the top open for the
insertion of the beans, nuts, seeds, or fruit. It is found in practice that when
pressure is applied and before the friction due to such pressure is sufficient to retain
the material a considerable quantity is forced out through the space left open,
thus reducing the possible working capacity of the box.
Now in this invention in addition to the flanges which close the sides, and the
removable plate which closes the bottom, I attach a lip or flange to the upper edge
of one of the plates which form the press box, and form a corresponding recess or
groove in the other plate, in such manner that when the boxes are opened to the
full extent, the lip and recess are far enough apart to allow of the nuts, seeds, or
the like being dropped or fed in. But when the plates are forced together, the lip
or flange reaches the edge of the recess and closes the top of the press box before
the pressure upon the contents has become great enough to express the oil.
A very small space is left open, sufficient to direct the oil into the groove, from
whence it passes through specially arranged passages to the press channels.
I shape the upper or removable plate and the sole plate with sloping edges in such
manner as to secure the flowing of the oil into the channels when the upper plate
is removed.
In some cases I attach a scraper or scrapers to the sole plate so that when the
removable plate slides back any oil which has adhered to it is scraped into the
channels.
In the accompanying drawings :-
Fig. 1 is a vertical section of part of a press shewing three plates forming press
boxes according to my invention.
Fig. 2 is a plan (on an enlarged scale) of the press boxes.
Fig. 3 is a vertical section of the upper part of the press boxes.
Fig. 4 is a plan, (part section) of same.
Fig. 5 is an elevation of part of same.
.
Fig. 6 is a transverse section of sole plate, shewing removable plate and
scraper.
Sliding horizontally in the framing of a hydraulic or other press are a number
of vertically disposed plates forming press boxes, which have their female sides h¹
bevelled as shewn in Fig. 2 to the approximate thickness of the cake when pressed.
The bottom is closed preceding and during pressure by a removable plate o which,
when the oil has been expressed and the cake is formed, can be caused to slide out
so as to allow the cake to drop out. The upper edge of each has a lip a³ and a
recess a². formed in it.
Figs. 3, 4, and 5 shew my improvements in the press boxes, one of the plates
forming the press box, (preferably that which forms the "male" side) has a
projecting lip or flange a³ formed upon it, which, when two boxes are forced
together, fits into and partly fills a corresponding recess or channel a³ formed in
the female side of the adjacent press plate. This recess is so shaped with a
channel that it receives the oil (which is prevented from escaping by the lip or
flange a³) and allows it to flow into passages 6', and thence out of the press.
lip or flange a³ closes the opening between two press boxes, and prevents any loss
of oil by the latter squirting out when the pressure is greatest. The press boxes
may be made hollow as shewn for the introduction of hot or cold fluid.
The
Fig. 6 shews. an improved form of sole plate a, channels P, and removable
plate o; the sloping surfaces of the plate a ensure the running of the drip oil into
the channels p when the removable plate is withdrawn. o¹ is an adjustable scraper
screwed to the removable plate for the purpose of leading any oil which adheres to
the bottom of the boxes, into the channels p when the removable plate is withdrawn
as aforesaid.
When the press boxes (previously filled with beans, olives, or the like) are
pressed together the lips a³, as soon as the pressure becomes great, close the
openings at the upper edges of the boxes, except a slit. through which the oil is

page_text: forced into the recesses a³, and channels 61; thus effecting a large saving of oil
When the oil has been expressed, the sloping of the edges of the sole plate a
ensure its flowing into the channels p, and the scraper o' serves to detach any oil
which may remain adherent to the bottom of the press boxes.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. In a horizontally disposed press for expressing oil or other liquids from
substances containing the same, the improved press plate having a projecting flange
or lip formed upon one side, and a corresponding groove or lip upon the other side
of its upper edge, substantially as described and shewn.
2. In a press plate for use in a horizontally disposed press for expressing oil or
other liquids from substances containing the same, the combination of a plate, side
flanges, an upper lip or flange, a corresponding recess, channels, and passages for
carrying off the oil, the bottom being closed by a removable plate, substantially as
described and shewn.
3. For use in a press as hereinbefore described the improved form of removable
plate and scraper, arranged so as to direct the oil into the channels, substantially
as described and shewn.
Dated this 29th day of February 1896.
GEO. MITCHELL.