Improvements in Thrashing Machines.
Year: 1894

page_text: Date of Application, 23rd Nov., 1894
Complete Specification Left, 23rd Aug., 1895-Accepted, 5th Oct.,
1895
PROVISIONAL SPECIFICATION.
Improvements in Thrashing Machines.
I JAMES MARSHALL of the Firm of Marshall Sons & Company Limited of
Britannia Iron Werks, Gainsborough in the County of Lincoln, Engineers, do
hereby declare the nature of my invention to be as follows:--
My invention relates to thrashing machines having an additional separating
apparatus or second caving riddle such as is described in the Specification of Letters
Patent 15931 of 1891 granted to me wherein the chaff or cavings from the additional
separating apparatus or second caving riddle fall on to an underneath board an l
from thence to the caring riddle beneath.
According to my present invention the chaff and grain passing through the
additional separating apparatus or second caving riddle instead of being delivered
by means of the underneath board on to the lower riddle is delivered direct from
the said board onto the lower dressing shoe without falling onto the lower caving
riddle. This I effect by delivering what passes through the additional dressing
apparatus or second caving riddle through openings or passages on each side or on
one side of the lower caving riddle which can be narrowed to allow a passage either
on each side or on one side only the said underneath board sloping towards this
passage or these passages.
Dated this 23rd day of November 1894.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.
Improvements in Thrashing Machines.
1, JAMES MARSHALL, of the Firm of Marshall, Sons & Company Limited of
Britannia Iron Works, Gainsborough in the County of Lincoln Engineers, 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 :-
My invention relates to thrashing machines having an additional separating
apparatus or second caving riddle such as is described in the Specification of Letters
Patent 15931 of 1891 granted to me and wherein the chaff or cavings from the
additional separating apparatus or second caving riddle fall onto an underneath
board and from thence to the caving riddle beneath and the object of my present
invention is to improve the arrangement of the shaking and riddling surfaces so as
to relieve the caving riddle and ensure a more perfect separation of the grain from
the straw. I will describe my invention with reference to the accompanying
drawings. Figure 1 of which is a longitudinal section of so much of a thrashing
machine as is necessary to illustrate my improvements: Figure 2 is a plan of the
same and Figure 3 a transverse section on the line 1-2, Figure 1.
According to my present invention the chaff and grain passing through the
additional separating apparatus or second caving riddle marked B in the drawing,

page_text: It has
instead of being delivered by means of the underneath board H on to the lower
riddle A is delivered direct from the said board on to the lower dressing shoe E
without falling on to the lower caving riddle. This I effect by delivering what
passes through the additional separating apparatus or second caving riddle through
openings or passages on each side or on one side of the lower caving riddle A
which can be narrowed to allow a passage either on each side or on one side only
the underneath board H sloping towards this passage or these passages.
been found, especially in hot climates wherein the straw readily breaks up, that the
ordinary caving riddle is not sufficient to deal with the amount of short straw and
cavings delivered from the concave and shakers and consequently a portion of the
corn is left in the said short straw and cavings when discharged from the machine
whereas by my present invention the separation of grain from the straw and cavings
has been found perfect.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
In thrashing machines the combination with the additional separating apparatus
or second caving riddle B of an arrangement beneath the said additional separating
apparatus whereby the chaff and grain which passes through the additional separating
apparatus is delivered direct onto the lower dressing shoe without falling onto the
lower caving riddle A substantially as herein before described.
Dated this 23rd day of August 1895.
JOHNSONS & WILLCOX.
Agents.