Year: 1889

page_text: Date of Application, 20th Feb., 1889
Specification Accepted, 23rd Mar., 1889
1, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent Agents,
Southampton Buildings in the County of Middlesex do hereby declare the nature of
the said 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 grinding-mills wherein the attrition is produced by means
of balls or spheres rolling in a rotating cylinder or chamber.
In ball grinding mills as hitherto usually constructed it has been found in practice
that the spokes or arms placed in the aperture for the admission of the material to be
ground from the feeding hopper into the rotating cylinder or chamber obstruct the
passage of the said material through the said aperture more especially when a com-
paratively large number of the said arms or spokes are employed. Moreover if the
spaces between the arms or spokes are increased the balls or spaces can escape from
the cylinder through the said spaces. The last named defect frequently causes very
considerable inconvenience, inasmuch as the balls get into the hopper and destroy its
walls by reason of the pressing action maintained by the rotating shaft.
The object of the present invention is to obviate the above-mentioned defects in a
very simple manner.
In the accompanying drawing I have shewn how the said invention may be
conveniently and advantageously carried into practice.
Figure 1 is a vertical longitudinal central section of a ball grinding-mill or
disintegrator with the present improvements applied thereto.
Figure 2 is a transverse section on the line a Figure 1.
Like letters indicate corresponding parts in these two figures.
A is the rotating cylinder or chamber of the said ball grinding-mill: B is the shaft
on which the said cylinder or chamber is fixed: Cis the feeding hopper. a is an
aperture in the cylinder or chamber A for the passage of the material to be ground
from the hopper C into the interior of the said cylinder or chamber.

page_text: In the aperture a are provided helical vanes or blades 6 which take the place of the
arms or spokes usually employed to support the cylinder or chamber A on the shaft B.
The helical vanes or blades 6 by their rotation convey the material to be ground from
the hopper C into the interior of the cylinder or chamber A. Moreover the said
helical vanes or blades 6 prevent the escape of the balls or spheres from the said
cylinder or chamber into the hopper, by throwing back the said balls whenever the
latter come into contact with the said vanes or blades.
It is obvious that I can if desired modify the form of the helical vanes or blades
and that I can employ any suitable number of the said vanes or blades. My said
invention is applicable to ball-grinding-mills of somewhat different construction to
that shown.
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 correspondents I wish it understood that I claim
A ball-grinding-mill in which helical vanes or blades are arranged in the admission
aperture substantially as hereinbefore described and for the purposes specified.
Dated this 20th day of February 1889
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.