IMPROVEMENTS IN OIL PRESS PLATES
Year: 1878

page_text: LETTERS PATENT to Harrison Holt, of the Firm of Willows, Holt, and Willows,
of High Street, in the Town and County of Kingston-upon-Hull, Seed Crusher,
for the Invention of "IMPROVEMENTS IN OIL PRESS PLATES."
Sealed the 29th October 1878, and dated the 2nd May 1878.
PROVISIONAL SPECIFICATION left by the said Harrison Holt at the Office of
the Commissioners of Patents on the 2nd May 1878.
HARRISON HOLT, of the Firm of Willows, Holt, and Willows, of High Street, in
the Town and County of Kingston-upon-Hull, Seed Crusher. "IMPROVEMENTS IN
OIL PRESS PLATES."
The object of my Invention is to construct oil press plates in such a form as tọ
produce a more uniform and better finished cake, and to secure for the oil expressed
from linseed or other meal, when under hydraulic or other pressure, a free and
uninterrupted outflow from the centre and edges of the cake and edges of the
plates.
I accomplish my object in the following manner :-The press plates are corrugated
transversely the entire width of the plates, having also a transverse concavity the
full length of the plates. The bottom plate is only slightly concave, and the cor-
rugated furrows in this plate are made deeper towards the edges of the same, so
that the bottoms of the corrugations at each side have a slight incline towards the
edges of the plate, thus facilitating the free and uninterrupted flow of the oil from
the cake and plate. The transverse concavity of the top press plate is deeper than
that of the bottom plate, the concavity being of such depth that the sides of the
plates grip the meal firmly towards the edges of the cake, thus preventing the meal
spreading outwardly, and in conjunction with the slight incline given to the
bottoms of the corrugations towards the outer edges of the lower plate, obviating
the tendency of the oil to lodge between the outer edges of the cake and plate,
which oil, on the pressure being relaxed, would otherwise be absorbed by the outer
edges of the wrapper and transmitted to the surface of the cake.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Harrison Holt in the Great Seal Patent Office on the 1st November
1878.
HARRISON HOLT, of the Firm of Willows, Holt, and Willows, of High Street, in
the Town and County of Kingston-upon-Hull, Seed Crusher. "IMPROVEMENTS IN
OIL PRESS PLATES."
The object of my Invention is to construct oil press plates in such a form as to
produce a more uniform and better finished cake, and to secure for the oil expressed
from linseed or other meal, when under hydraulic or other pressure, a free and
uninterrupted outflow from the centre and edges of the cake and edges of the
plates.
I accomplish my object in the following manner :-The press plates are corrugated
transversely the entire width of the plates, having also a transverse concavity the
full length of the plates. The bottom plate is only slightly concave, and the cor-
rugated furrows in this plate are made deeper towards the edges of the same, so that
the bottoms of the corrugations at each side have a slight incline towards the edges
of the plate, thus facilitating the free and uninterrupted flow of the oil from the
cake and plate. The transverse concavity of the top press plate is deeper than that
of the bottom plate, the concavity being of such depth that the sides of the plates
grip the meal firmly towards the edges of the cake, thus preventing the meal
spreading outwardly, and in conjunction with the slight incline given to the bottom
of the corrugations towards the outer edges of the lower plate, obviating the
tendency of the oil to lodge between the outer edges of the cake and plate, which
oil, on the pressure being relaxed, would otherwise be absorbed by the outer edges
of the wrapper and transmitted to the surface of the cake.
Such being the nature and object of this my Invention, I will now proceed to
describe the same in detail, and in order that the same may be fully understood, I
have hereunto annexed one Sheet of Drawings, and have marked the same with
letters of reference.
Figure 1 represents a series of my improved press plates when in the press.
Figure 2 is a plan of the plate referred to as the bottom plate, which may be
branded as required.
Figure 3 represents the corrugations extending over the entire width of both
press plates.
Figure 4 is a transverse section shewing the top of the corrugations, and the
inclination of the bottom of the furrows towards the edges of the bottom plate.
Figure 5 is a longitudinal section. In all the Figures similar letters represent
similar parts.
The press plates are indicated by the letters A and B, the letter C representing
the body plate, to which the press plates A and B are secured; the three plates may
however be formed in one. In the bottom plate A, the line D represents the top of
the corrugations, which are so arranged as to form a slight concavity the full
length of the plate; the line E shews the bottom of the furrows, and at F, F, the
inclination towards the outer edges of the plate; these furrows are parallel with the
top of the corrugations in the centre of the plate, but for a distance of two inches, 4
more or less, from the sides of the plate falling or inclining outwardly towards the
side of the same into the gutter G of the body plate C. The top plate B is corrugated
transversely the full width of the plate, and is arranged with a concavity J some-
what deeper than that of the bottom plate; this concavity in combination with
that of the bottom plate having the effect of preventing the meal spreading out- 5
wardly when under pressure.
Having thus described in detail the nature and objects of my Invention, and the
manuer of carrying the same into effect, I have to state that I do not confine myself
to the precise details already described and illustrated, but that what I believe to

page_text: be novel and original, and claim as the Invention secured to me by the herein-
before recited Letters Patent is,-
The formation of oil press plates, with corrugations extending over the entire
width of the plates, substantially as and for the purposes already described and
illustrated by the accompanying Drawings.
The formation of oil press plates, with the extended furrows inclining outwardly,
that is, towards the edges of the plates, substantially as and for the purposes
already described, and illustrated by the accompanying Drawings.
In witness whereof, I, the said Harrison Holt, have hereunto set my hand
and seal, this Twenty-eighth day of October, in the year of our Lord One
thousand eight hundred and seventy-eight.
Witness,
JOHN WAUGH,
Engineering and Patent Offices,
Bradford,
Yorks.
HARRISON HOLT. (L.S.)