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Патент USA US2403638

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July 9, 1946-
Filed ‘Nov. 26, 1943
Q J?ve?ibr:
.A. D. Clark
Patented [July 9, 1946
“- ‘Andrew- Douglas'Clark, Pietermaritzburig, Natal,"
-:' ~'
7 Union of South Africa
ApplicationNovember 26, 1943, Serial No. 511,839
In the Union: of South Africa-'May
. This § invention relates to improvements in
thrashing machines and has referencelto ama- '
chine particularly adapted for the purpose of
thrashing beans, peas and like crops although it
isbyv no means limited to this speci?cuse andv
may accordingly‘ be used ,for thrashing; many
other farmcmps-
An object of the invention is to provide a ma:
1943 '
tion, extends from a point near the top of the
' drum casing to a‘ point substantially in line
horizontally with the ‘axis thereof, or a short
distance below said axisand is arranged on the
side ofv the casing substantially opposite to a
feed opening therein by means of which the crop
to be thrashed is fed vto the machine,’
_ It is to be understood, that-the beaterdrum
is rotated in a direction so- that. the motion. of
centage of seeds or kernels which are broken in 10 its top side is from said feed opening towards
the ?xed “concave” bar assembly.
the course of the thrashing operation.
In a preferred construction the ?xed bar mem
The invention is an improvement in the well
bers forming the “concave” assembly, are ar
known general type of thrashing machine in
chine which will reduce to a'minimum the per
which the actual thrashing operation is effected
ranged in pairs with the spaces between each
by a rapidly rotating drum which coacts with 15 pair substantially greater than the spaces‘be
tween the bars forming each pair.
a ?xed “concave” of arcuate, grid or cage for
Both the ?xed and rotating rubber-covered
mation positioned in outwardly spaced relation
bars are readily replaceable such as by being in
ship with the path of a plurality of spaced beater
the form of metal rods or pipe lengths, having
elements attached to the drum; in which the crop
to be thrashed is fedinto the space between the 20 a screw thread on at least one end thereof With
which a nut or nuts co-operate for ?xing said
path of said beater elements and the “concave”
ends in holed brackets, lugs or the like project
through a suitably positioned feed opening to
ing from the beater drum.
wards the top of the drum casing, and in which
To enable the invention to be more clearly
the thrashed grain and husks are discharged
through‘an opening in the bottom of the casing 25 understood and carried into practice, reference
is now made to the accompanying drawing, in
“ onto suitable sieving and winnowing means.
According to the invention a thrashing ma
‘ which like references denote like parts through
out the several views.
chine for the purpose and of the kind set forth,
In the drawing:
is characterised in that the actual thrashing oper
ation is effected by means of a rotating drum 30 Fig. 1 is a part-sectional vertical elevation of
member which is provided with a plurality of cir
a thrashing machine constructed according to
cumferentially spaced beater bars arranged par
the invention.
allel with the axis thereof, which beater bars
Fig. 2 is a fragmentary vertical sectional view
have at least their contact surfaces covered with ~ of the rotating drum member and easing, of Fig.
or made of rubber or equivalent resilient material, 35 1, but drawn to a larger scale.
and are arranged to rotate in inwardly spaced
' Fig. 3 ‘is a fragmentary end view of one-of
relationship with a plurality of spaced similarly
the beater bars and its supporting lug, and
covered or constructed co-acting ?xed “concave”
bars, arranged towards the upper side of an en
closing casing having an outlet opening in the
bottom side thereof for the discharge of the
Fig. 4 is a part-sectional shortened View of
the beater bar and lugs of Fig. 3.
40 Referring to the drawing reference I denotes
a casing having a feed chute 2 and a bottom dis
thrashed grain and husks onto suitably posi
charge opening 3 through which the thrashed
tioned sieving and winnowing means.
grain and husks fall onto the usual sieving and
More particularly the beater and “concave”
winnowing means denoted generally by the ref
bars all consist of cylindrical members each cov 45 erence 4, the whole assembly being supported in
ered with a rubber sleeve or layer.
The beater
bars are arranged in equally spaced relationship
around the drum, and are secured in outward
a frame 5.
Mounted on a shaft M for rotation within the
casing I, is the drum 6 to which are attached,
means of the lugs 1, the six spaced beater bars
thereof by means of radially projecting brackets 60
8, which are arranged so that they rotate close
or lugs, preferably ?xed to the ends of the drum
to the three spaced pairs of ?xed “concave”
or formed integrally therewith.
bars 9, which aredisposed within the casing l,
The said ?xed “concave” bar assembly com
as more clearly shown in Fig. 2, so that the lower
posed of a plurality .of spaced rubber-sleeve-cov
bar of each pair is nearer the path of rotation
ered bar members and arranged in arcuate forma
radially spaced relationship with the periphery
of the beater bars 8 than the upper bar 01' each
than the other bar and being located for coop
eration with the bars of the rotary drum.
Both the beater bars 8 and the ?xed “concave”
bars 9, are each provided with a rubber sleeve In
as more clearly shown in Fig. 4. ,Each of the
said bars preferably consists of a length of metal
piping II, threaded over a rod [2, having nuts
2. In a machine of the character described,
the combination of a. rotary drum, brackets on
the end walls of the drum, bars having a resil
ient outer covering secured to the brackets in
outwardly spaced relationship with the periph
l3 on its screw-threaded ends by- which‘ the bars
ery'of the drum, a casing surrounding the drum,
are ?xed to'the lugs l or, in the case of the ?xed
and pairs of bars each having a resilient outer
“concave” bars, to the end walls of the casing I. 10 covering secured to the inner wall of the casing
With a machine in which the diameter of the
with one bar of each pair spaced farther away
path of rotation of the beater bars 8 is about 18
from the wall of the casing than the other bar,
inches, the speed of rotation for the drum is gen
both of the bars having a resilient outer cover
erally 550 to 600 R. P. M., while'i’or thrashing
ing for cooperation with the bars of the drum.
beans, peas and like crops, the speed is prefer 15
3. _In a machine of the character described, the
ably about 420 R. P. M.
combination of a rotary drum, brackets secured
An adjustable lip plate [5 projecting from, the _e to the end walls of the drum, bars mounted on
bottom side 01.’ the feed chute 2, guides the crop
the outer ends of the brackets, metal sleeves sur
to be thrashed into the path of the rotating
rounding the bars and rubber tubing surrounding
beater bars 8.
20 the metal sleeves between the brackets, a casing
What I claim is:
surrounding the drum, and pairs of bars each hav
1. In a machine of the character described,
ing a resilient outer covering secured to’the inner
the combination of a rotary drum, brackets on
wall of the casing with one bar of each pair closer
the end walls of the drum, bars secured to the
to the wall of the drum than the other bar of
brackets in outwardly spaced relationship with 25 each pair, both of the bars of each pair compris
the periphery of the drum, a casing surrounding
ing a metal rod secured to the casing, a =metal
the drum, and pairs of bars secured to the inner
sleeve surrounding the rod and a tubular rubber
wall of the casing, with one bar of each pair at
cushion surrounding the sleeve.
a greater distance from the wall of the casing _
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