IMPROVEMENTS IN " to MILLS OR TRITURATORS FOR REDUCING CEMENT OR OTHER HARD SUBSTANCES
Year: 1884

page_text: I, WILLIAM DAWSON, of the Cedars, Chiswick, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of said invention for "IMPROVEMENTS IN
" to
MILLS OR TRITURATORS FOR REDUCING CEMENT OR OTHER HARD SUBSTANCES
be as follows :-
According to my invention for triturating or reducing hard substances such as
cement or quartz I employ copper surfaces which become impregnated with
particles of the material under treatment in such a way that these particles act
upon other portions of the material under treatment and help to effect their
reduction, portions of the material under treatment thus producing in conjunction
with the copper surfaces, what may be termed a continuous automatic dress.
A convenient arrangement of mill or triturator according to my invention can be
constructed with a conical or conoidal part corresponding to a bedstone and which
I will call the male cone.
Its surface is suitably dressed and it is arranged with the smaller diameter
uppermost. Over it is a hollow conical or conoidal runner appropriately dressed
at its inner surface and suitably driven.
The male cone and the runner are formed with annular recesses near their bases
to receive annular bands of copper which are fixed in any suitable way and are
arranged face to face so that material under treatment after being partially reduced
by the operation of the dressed upper portions of the male cone and runner, is, as
it descends, further treated between the copper surfaces.
It is however to be understood that mills or triturators of other forms may be
constructed with copper surfaces between which material to be reduced can be
treated in the manner above set forth.
W. LLOYD WISE,
Pro. James G. Stokes,
Applicant's Agent.

page_text: COMPLETE SPECIFICATION.
I, WILLIAM DAWSON, of the Cedars Chiswick in the County of Middlesex Civil
Engineer do hereby declare the nature of my invention for "IMPROVEMENTS IN
MILLS OR TRITURATORS FOR REDUCING CEMENT OR OTHER HARD SUBSTANCES,"
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement :—
According to my invention for triturating or reducing hard substances such as
cement or quartz, I employ copper surfaces which become impregnated with
particles of the material under treatment in such a way that these particles act
upon other portions of the material under treatment and helps to effect their
reduction portions of the material under treatment thus producing in conjunction
with the copper surfaces, what may be termed a continuous automatic dress.
A convenient arrangement of mill or triturator according to my invention can be
constructed with a conical or conoidal part corresponding to a bedstone and which
I will call the male cone.
Its surface is suitably dressed and it is arranged with the smaller diameter
uppermost. Over it is a hollow conical or conoidal runner appropriately dressed
at its inner surface and suitably driven. The male cone and the runner are formed
with annular recesses near their bases to receive annular bands of copper which are
fixed in any suitable way and are arranged face to face so that material under
treatment after being partially reduced by the operation of the dressed upper
portions of the male cone and runner is, as it descends further treated between the
copper surfaces.
It is, however, to be understood that mills or triturators of other forms may be
constructed with copper surfaces between which material to be reduced can be
treated in the manner above set forth.
In the accompanying drawing I have illustrated a mill embodying an application
of my invention the arrangement being such that no alteration of gearing or
appurtenances is required.
a is a part corresponding to a bed-stone of conical or conoidal form, b is the
part corresponding to a top stone or runner. Each is provided with corrugations c
which assist the feed. d d are rings of copper forming soft metal grinding surfaces
secured in recesses formed in the two parts a and b, but I may in some cases
employ a metal grinding surface on one of those parts only; or in lieu of employing
one such surface either on one or on both the parts a and b there may be two or
more soft metal grinding surfaces on each. e is a shaft actuated in any convenient
manner for rotating the runner b.
My invention may obviously be used in other forms of mills.

page_text: 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. In a grinding mill the use of a grinding surface or surfaces formed of soft
metal substantially as described.
2. The improved grinding mill with soft metal grinding surfaces, constructed
arranged and operating as described and shown.
Dated this 9th day of March 1885.
WILLIAM DAWSON.
W. Lloyd Wise,
46, Lincoln's Inn Fields, London, W.C.,
Applicant's Agent.