Improvements in and relating to Grinding-mills.
Year: 1892

page_text: Date of Application, 15th Feb., 1892
Complete Specification Left. 15th Nov., 1992-4ccepted, 17th Dec., 1892
PROVISIONAL SPECIFICATION.
[Communicated from abroad by JOHANN HEINRICH AMANDUS KAHL, of
21, Kleine Reichenstrasse, Hamburg, in the Empire of Germany, Manu-
facturer.]
Improvements in and relating to Grinding-mills.
I, HENRY HARris Lake, of the firm of Haseltine Lake and Co., Patent
Agents, 45 Southampton Buildings in the County of Middlesex, do hereby declare
the nature of this invention to be as follows:-
This invention relates to improvements in crushing or grinding mills of the class
known as rolling-balls grinding mills and the object of the same is to provide means
for adapting the latter for the disintegration of substances of different properties,
such as for instance hard brittle blast furnace slag and soft slippery phosphates.
Heretofore the drum within which the rolling-balls operate were made with a
perforated or grated circumference serving as a screen or net-work with meshes of
invariable size, which might allow the use of the mill only for the disintegration of
certain materials and the production of a meal of certain fineness.
According to my invention the circumference of the drum containing the
rolling-balls is composed of a number of solid segments being arranged a certain
distance from each other and the open spaces so formed are partly closed by suit-
able gates in such a manner, that transversely to the direction of rotation,
i.e. parallel to the axis of the same narrow slits are formed through which the .
sufficiently ground meal of the substance to be pulverized may escape. These
gates are rigidly fastened to the base-plates of the drum by screw-bolts drawn
through outwardly extending flanges of the gates so that an alteration in the
position of the latter relative to the diameter of the drum will cause an alteration
of the width of said slits. For this reason the gates may be radially moved or
they may be designed to swing about one of their fastening bolts, particularly one
of the outmost so that by turning a gate about the said bolt the width of both of
the said transverse slits or joints become uniformly altered, even as it may be
required by the different properties of the material to be ground or the degree of
fineness of the meal desired.
It is also preferred to provide those edges of the said solid segments of the drum
adjoining the gates and being the foremost ones in relation to the direction of.
rotation of the drum with an angular armour plate in order to better protect the
same against wear and tear and to cause the balls meeting against said armour
plates to move within the drum with continually altering velocity for the purpose
of increasing considerably the effect of the mill.
Dated this 15th day of February 1891.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in and relating to Grinding-mills.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co., Patent
Agents 45 Southampton Buildings, in the County of Middlesex, do hereby
10 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 relates to improvements in crushing or grinding mills of the class

page_text: known as ball-grinding mills; and the object of the same is to provide means for
adapting the latter for the disintegration of substances of different properties, such
as for instance, hard brittle blast-furnace slag and soft slippery phosphates.
I attain this object by the mechanism and arrangement of parts illustrated in the
accompanying drawing in which,
Figure 1 is a sectional side elevation of a drum containing the rolling balls and
embodying this invention, and
Figure 2 is a transverse section on the line x, x of Figure 1.
Heretofore the drum within which the rolling balls operate were made with
a perforated or grated circumference serving as a screen or net-work with
meshes of invariable size, which only enabled the mill to be used for the
disintegration of a meal of certain fineness.
According to this invention the circumference of the drum containing the
rolling-balls is composed of a number of solid segments being arranged a certain
distance from each other and the open spaces so formed are partly closed by
suitable gates c in such a manner, that transversely to the direction of rotation,
i.e. parallel to the axis of the same, narrow slits e are formed through which the
sufficiently ground portion of the substance to be pulverized may escape. These
gates are rigidly fastened to the base-plates a of the drum by screw-bolts d' d' d
drawn through outwardly extending flanges c' of the gates so that an alteration in
the position of the latter relative to the diameter of the drum will cause an
alteration of the width of the slits e. For this reason the gates may be radially
moved or they may be designed to swing about a pivot d at one end of the
flanges c', so that by turning a gate about the said pivot the width of both of said
transverse slits or joints e become uniformly altered, even as it may be required by
the different properties of the material to be ground or the degree of fineness of the
meal desired.
In the arrangement described the edge next to the pivot of each gate (the one
ahead in the direction of the drum) is adapted to perform a more radial, the
opposite edge a more tangential path on turning the gate about its pivot.
However, means may be provided which require the gates to be so adjusted that
both their inner edges are radially moved in order to alter the width of the
slits e.
It is also preferred to provide those edges of the said solid segments 6 of the
drum adjoining the gates c being the foremost ones in relation to the direction of
rotation of the drum, with an angular armour plate, in order to better protect the
same against wear and tear and to cause the balls meeting against said armour
plates to move within the drum with continually altering velocity for the purpose
of increasing considerably the effect of the mill.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by
my foreign correspondent, I declare that what I claim is :
In combination, in a rolling ball grinding mill, a drum composed of a number of
solid segments barranged a certain distance from each other between the base
plates a, with the adjustable gates c adapted to partly fill the open spaces in the
circumference of the drum, and the armour-plates f, substantially as and for the
purpose set forth.
Dated this 15th day of November 1899.
CHIS TO Y
OI November 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.