IMPROVEMENTS IN THRASHING MACHINES WITH CONICAL DRUMS
Year: 1876

page_text: A com-
LETTERS PATENT to Carl Pieper, of Dresden, Saxony, for the Invention of
"IMPROVEMENTS IN THRASHING MACHINES WITH CONICAL DRUMS."
munication from Wilhelm Helınsıüller, residing at Diepholz, Prussia.
Sealed the 22nd August 1876, and dated the 25th February 1876.
PROVISIONAL SPECIFICATION left by the said Carl Pieper at the Office of
the Commissioners of Patents on the 25th February 1876.
CARL PIEPER, of Dresden, Saxony. "IMPROVEMENTS IN THRASHING MACHINES
WITH CONICAL DRUMS." A communication.
The object of my Invention is to decrease the power required for driving
thrashing machines, and for this purpose I construct the drum as well as the cage of
the same of a conical shape.
The main object of the thrashing machine is to separate the grains from the ears.
The power required for this purpose solely, however, is but small as compared with
the whole power necessary to draw the straw together with the cars through the
machine. Especially the root ends of the straw present a relatively great resistance
as they are the most rigid part of the plant. From this consideration I have been
induced to decrease the diameter of the drum towards the end, over which the root
ends of the straw are to be passed, so as to lessen the circumferential speed of this part,
and consequently to decrease the amount of power necessary for forcing the straw for-
ward between the drum and the cage. Moreover the decrease of diameter towards
the one end lessens the resistance of the air which the drum has to overcome, and
which absorbs a material fraction of the whole engine power required for driving a
thrashing machine.
The drum being made of the usual diameter at the end which is to perform the
special service of detaching the grains from the straw the efficiency of the machine
remains the same as others of the present day of the same size.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Carl Pieper in the Great Seal Patent Office on the 23rd August 1876.
CARL PIEPER, of Dresden, Saxony. "IMPROVEMENTS IN THRASHING MACHINES
WITH CONICAL DRUMS." A communication from Wilhelm Helmsmüller, residing at
Diepholz, Prussia.
The object of this Invention is to decrease the power required for driving
thrashing machines, and for this purpose the drum as well as the cage of the machine
is constructed in a conical shape.
The main object of the thrashing machine is to separate the grains from the cars.
The power required solely for this purpose, however, is but small as compared with
the whole power necessary to draw the straw together with the ears through the
machine. Especially the root ends of the straw present a relatively great resistance,
as they are the most rigid part of the plant. From this consideration the Inventor
has been induced to decrease the diameter of the drum towards the end over which
the root ends of the straw are to be passed, so as to lessen the circumferential
speed of this part, and, consequently, to decrease the amount of power necessary for
forcing the straw forward between the drum and the cage. Moreover, the decrease
of diameter towards the one end lessens the resistance of the air which the drum
has to overcome, and which absorbs a material fraction of the whole engine power
required for driving a thrashing machine.
The drum being inade of the usual diameter at the end which is to perform the
special service of detaching the grains from the straw, the efficiency of the machine
remains the same as that of others of the present day of the same size.
On the accompanying Sheet of Drawings a part of a thrashing machine with my
improved drum is represented in two views. a is the shaft, and b, b, are the beaters
which constitute the conical drum; c, c, is the cage which necessarily has to corre-
spond to the shape of the drumm; e, e, are screws for the adjustment of the cage, and
dis the stand for the attendant who has to feed the machine.
It barely requires to be mentioned that this conical drum may be used together
with all the auxiliary arrangements required in combined machines for thrashing,
separating, and cleaning the corn, in the same manner as the cylindrical drums at
present in use.
Having now particularly described and ascertained the nature and object of the
said Invention, and in what manner the same may be performed or put in practice,
I hereby declare that I claim the herein-described improvement in thrashing
machines, wherein the following is the important point or feature:-The construc-
tion of the drum and the cage of thrashing machines in conical shape, as and for
the purpose specified.
In witness whereof, I, the said Carl Pieper, have hereunto set my hand and
seal, this Fifteenth day of July, in the year of our Lord One thousand
+31111nd accessiber wir
CARL PIEPER. (L.S.)