Improvements in or relating to Thrashing Machines.
Year: 1896

page_text: Date of Application, 16th May, 1996--Accepted, 3rd Oct., 1896
COMPLETE SPECIFICATION.
Improvements in or relating to Thrashing Machines.
I, MICHAL DORNWALD of Przemysl, Galicia, in the Empire of Austria,
Manufacturer 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 :-
The present invention relates to an arrangement of the chief co-operating parts
(beater-cylinder and concave) of thrashing machines, whereby a much higher
efficiency is attained as compared to the machines used hitherto and also a perfect
thrashing out of ears without damaging the grains and with a considerably smaller
amount of broken and therefore useless straw.
The arrangement principally consists in providing on the flat beaters of the
thrashing drum and on the co-operating Hat bars of the concave, tooth-like
projections in a certain order and placing the two parts of the machine (drum and
concave) in such a manner as to have their teeth at a greater distance apart at the
straw entrance than at the straw discharge and the teeth at no place engaging with
each other, so that the end surfaces of the co-operating teeth operate on corn only
by friction increasing in the direction of the discharge and, as they do not engage
with each other, the grains do not get broken or crushed.
The arrangement is illustrated in the accompanying drawing, in which
Fig. 1 is a vertical cross-section of the arrangement.
Fig. 2 a side elevation of a part of the beating drum and
Fig. 3 a plan of a part of the concave.
As is clear from the drawing, the concave A and the beating drum or cylinder B
have on their respective bars a and b tooth-like projections or spikes c and d. These
teeth or spikes, preferably bevelled on all four sides (truncated pyramids) are
arranged on the bars of the concave in rows in planes parallel to each other but
normal to the longitudinal direction of the bars (Fig. 3), whereas the teeth on the
beating drum are arranged on concentric bars in alternate order as indicated in
Fig. 2.
The concave, the beating drum and the teeth or spikes can be made of any
suitable material.
The concave, as well known, is adjustable, whereas the drum spindle is not
adjustable. The adjustment of the former allows only a lateral movement to or
from the drum, whereby the direct distance of the teeth on the concave and on the
drum can be increased or decreased only at or near the entrance (at f) of straw,
whereas at the straw discharge the path of the drum teeth nearly touches the
interior surface of the concave in each position of the latter, as may be seen from
Fig. 1.
The adjustment may be effected by means of an eccentric and rod, cam, adjusting
screw or equivalent device arranged at or near the entrance or top part of the
concave.
Thus the teeth of the drum can in no place engage with those of the concave
and so can have on the ears a rubbing action only, which increases going from the
entrance to the discharge.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is;
1. In thrashing machines the arrangement of tooth-like projections c and d on

page_text: the bars a of the concave and on the bars (or beaters) b of the thrashing drum in
such manner that the teeth of the latter are alternate on the consecutive bars
whereas those of the concave are in parallel rows and the rows are in planes
normal to the longitudinal direction of the bars of the concave, the path of the
drum teeth being eccentric relatively to the inner surface of the concave in all its
positions and being nearest this surface at the discharge end its distance from the
concave-teeth increasing towards the straw entrance.
Dated this 16th day of May 1896.
BOULT & WADE,
Agents for the Applicant.