Improvements in Concaves for Threshing Machines.
Year: 1896

page_text: Date of Application, 12th Feb., 1896
Complete Specification Left, 11th Nov., 1896-Accepted, 12th Dec., 1896
PROVISIONAL SPECIFICATION.
Improvements in Concaves for Threshing Machines.
I, GEORGE FLETCHER RUSSELL, of Railway Street, Kirby Moorside, in the
County of York, Agricultural Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to concaves for threshing machines and has for its objects
to simplify the construction of the same and to render them more efficient in
operation.
A concave constructed according to my invention has two end brackets each of
which is provided with a number of lugs corresponding with the number of cross-
bars or slats with which the concave is provided, the said cross-bars or slats being
bolted to the said lugs. These cross-bars are made of angle iron and are so
arranged that when the concave is in position, a flat surface is presented towards
the drum of the threshing machine. Upon these flat surface are arranged the
"rubbers" which are cross grooved or fluted on the working surface similarly to
the "beaters" of the threshing drum, the cross grooves or flutes on adjacent cross-
bars being arranged at angles to each other. The rubbers are also advantageously
of L-shape in cross section and are fixed on to the cross-bars by means of bolts
which are passed through those parts of the rubbers and the cross-bars which are
radial to the axis of the drum.
The usual wire-work is arranged in connection with the concave, the wires being
advantageously fixed by passing them through holes in the cross-bars.
Some of the chief advantages of the construction hereinbefore described are that
the rubbers can be renewed without taking out the concave from the machine and
that more threshing surface is obtained than when the ordinary flat rubbers are
used.
My removable rubbers are made of malleable iron or of steel or other suitable
metal.
COMPLETE SPECIFICATION.
Improvements in Concaves for Threshing Machines.
I, GEORGE FLETCHER RUSSELL, of Railway Street, Kirby Moorside, in the
County of York, Agricultural 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 staternent :-
This invention relates to concaves for threshing machines and has for its objects
to simplify the construction of the same and to render them more efficient in
operation.
A concave constructed according to my invention has two end brackets each of
which is provided with a number of lugs corresponding with the number of cross-
bars or slats with which the concave is provided, the said cross-bars or slats being

page_text: "
bolted to the said lugs. These cross-bars are made of angle iron and a 4 so arranged
that when the concave is in position, a flat surface is presented towards the drum of
the threshing machine. Upon these flat surfaces are arranged the "rubbers "
which are cross grooved or fluted on the working surface similarly to the "beaters'
of the threshing drum, the cross grooves or flutes on adjacent cross-bars being
arranged at angles to each other. The rubbers are also advantageously of L-shape
in cross section and are fixed on to the cross-bars by means of bolt which are
passed through those parts of the rubbers and the cross-bars whic' are radial to
the axis of the drum.
The usual wire-work is arranged in connection with the concave, the wires being
advantageously fixed by passing them through holes in the cross-bars.
Some of the chief advantages of the construction herein before described are that
the rubbers can be renewed without taking out the concave from the machine and
that more threshing surface is obtained than when the ordinary flat rubbers are
used.
My removable rubbers are made of malleable iron or of steel or other suitable
metal.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawings, in which :-
Figure is a sectional plan view illustrating the construction of a concave
according to my invention; and,
Figure 2 is a section on the line 2-2 Figure 1:
Figures 3 and 4 are a face view and edge view respectively illustrating a grating
used in place of the usual wires :
Figure 5 is a sectional. view illustrating the application of this grating to my
concave.
a, a are the end brackets of my concave and b, b, are the lugs formed upon the
said brackets. c, c are the cross bars carried by the corresponding lugs b, b on the
brackets a, a, the said bars being made of angle iron, as shewn in Figure 2, and
secured to the lugs by bolts d, d.
e, e are the rubbers which are ribbed or fluted as shewn in Figure 1, and secured
to the cross bars by bolts f, f.
9, 9 are the usual wires which are passed through and fixed in holes in the cross
bars c, c.
As the use of these wires necessitates the drilling of a very large number of
holes, and consequently the expenditure of considerable time, I sometimes dispense
with them and substitute therefor metal gratings h, h, Figures 3, 4 and 5, the said
gratings being preferably made of malleable iron and simply introduced between
the bars c, c and secured in position by bolts i, i.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manuer the same is to be performed, I declare that what I
claim is :-
1. The manufacture of concaves for threshing machines substantially as herein
before described and illustrated in the accompanying drawings ei her with wires
such as g, g or gratings such as h.
2. A concave for threshing machines having end brackets (a, as provided with
lugs (b, b,) carrying between them angle bars (c, c,) to which the rubbers are fixed,
substantially as described.
3. The combination with a concave constructed substantially as described in the
preceding claiming clause, of grating such as h in lieu of wires, substantially as
described.
Deted this 11th do
1
1000
G. F. REDFERN & Co.,
4, South Street, Fiusbury, London, Agents for the Applicant.