Improved Apparatus for taking Samples of Pulverised and Granulated Materials.
Year: 1898

page_text: Date of Application. 23rd Mar., 1898-Accepted, 28th May, 1898
COMPLETE SPECIFICATION.
Improved Apparatus for taking Samples of Pulverised and
Granulated Materials.
I, CARL GEISSLER, of Stassfurt, in the Kingdom of Prussia, Royal Mill
Manager, 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 :-
This invention consists in the arrangement or construction of an apparatus or
machine for automatically taking samples of ground, pulverised or granulated
materials such as flour, chemicals or minerals.
On the drawing appended hereunto
Fig. I shows a vertical section of a machine made according to my invention in
side view.
Figure II an end view partly in section.
Figures III and IV enlarged views of one of the drums in longitudinal and cross
section.
In order to obtain from any finely or coarsely ground product or powdered or
granular raw material an average sample, preferably several hollow drums, for
instance four, a, b, c, d are, as shewn on Figures I and II, arranged above_each
other in a frame B, the drums having each an inlet slit or opening A. C is a
hopper for the material to be sampled.
The first drum a is driven in any suitable way by means of a belt, rope,
chain or gearing. The number of revolutions of this drum is also optional. The
other drums are driven at a fixed ratio from the first drum by means of driving
chains D and chain wheels E. According to the number of revolutions of the first
drum, those of the others are suitably determined. On the specimen of a machine
shewn on the drawing four drums are arranged above each other. If the top
drum a makes for instance 12 revolutions, the second drum b may for instance
make 6, drum c three and drum d one revolution.
The ratios of speeds then will be
Consequently the drum will turn twice round while 6 turns once, and the
contents of drum a poured out through its slit A into the hopper below it will
alternately pass at one revolution of a past the drum 6 into the by pass shoot 2
and at the second revolution fill the drum b. Drum b likewise will once deliver its
contents past the drum c and at the second revolution fill it through its slit A.
The drum c will twice discharge past the drum d and at the third revolutions
fill it. The last lowest drum discharges its contents into a receptacle placed
beneath it.
In this way any desired quantity of material can be passed through the machine
and an exact average sample obtained. The material which does not reach the

page_text: last drum and is poured past the several drums falls through by pass shoots 1, 2, 3, 4,
into a collecting shoot e and is forwarded through this to its destination.
The quantity of material tested can be regulated by letting the drum a revolve
at greater or less speed.
In order to obtain a large or small quantity of the final average example, the
drums are provided with an adjustable curved slide f, Figures III and IV,
fixed upon the sector which can be turned on the drum shaft and locked in
position by means of the bolt h. According as the final quantity of the sample is
desired large or small, the slits or openings A in the several drums are regulated
by shifting the slides f correspondingly and locking them in position by the bolts h,
which are guided in slots i in the ends of the drums.
The number of drums may be made larger or smaller than that shewn as an
instance on the drawing; in some cases a single drum sufficing for taking average
samples.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1. The arrangement and construction of a machine or aappratus for obtaining
average samples containing a drum or several drums above each other each with an inlet
slit or opening and rotated so that the number of revolutions of each higher drum is a
multiple of that of the next lower drum, and hoppers and by pass shoots,
substantially as hereinbefore described and illustrated by the drawings.
2. In a machine or apparatus for taking average samples by means of rotating
drums and constructed as herein before described, the arrangement of an adjustable
curved slide for varying the size of the inlet openings of said drums substantially
as hereinbefore described with reference to Figure III and IV of the drawings.
Dated this 21st day or March
R. J. URQUHART,
57, Barton Arcade, Manchester,
Harrington Chambers, 24, North John Street, Liverpool,
Consulting Engineer and Patent Agent.