IMPROVEMENTS IN MILLS FOR CRUSHING, GRINDING OR PULVERIZING AND AMALGAMATING OR MIXING VARIOUS SUBSTANCES
Year: 1884

page_text: I WILLIAM HENRY THOMPSON of 14-Devonshire Square, Bishopgate Street in
the County of Middlesex, Engineer do hereby declare the nature of the said
Invention for IMPROVEMENTS IN MILLS FOR CRUSHING, GRINDING OR PULVERIZING
AND AMALGAMATING OR MIXING VARIOUS SUBSTANCES to be as follows:-
The invention relates to improvements in that class of mill in which crushing
balls, or rollers, or masses of metal or other material are employed in connection
with a fixed or moveable circular track or way.
Heretofore when these tracks or ways have been made of one piece of steel in
order to obtain the required strength, and at the same time provide enough material
to allow for the wear which always takes place in such class of tracks or ways they
have been made of considerable thickness.
This however has the disadvantage that when the maximum wear has taken
place, the worn track or way, has to be removed from the mill and a new one
inserted in its place thereby causing considerable pecuniary loss, as even in countries
where there is a ready market for scrap steel, it could only be sold at the price of
scrap steel, whilst in countries where such sale could not be readily effected, it'
would become simply a waste product, which would soon become inconvenient on'
account of its bulk.
Such tracks or ways as heretofore constructed are of considerable first cost.
Now according to my present invention I form such tracks or ways of two rings,.
the backing ring being by preference of good wrought iron, although mild steel,
homogeneous metal or other suitable material may be used whilst the wearing ring
or portion is made of steel as usual.
The backing ring is made of suitable proportions to furnish the required strength
whilst the wearing ring is of thickness only a little more than sufficient to provide
for the maximum amount of wear.
These two rings are united by shrinking the one upon the other or in other suitable
manner for instance the outer ring may be expanded by heat and then shrank upon
the wearing ring or the latter may be cut and sprung into place.
By my improved construction, when the. wearing ring has been so much worn
as to be useless it is removed from the backing ring and a new wearing ring inserted
in its place, by which means the amount of loss in waste material is reduced to a
minimum.
W. H. THOMPSON.
By Harris & Mills,
23, Southampton Buildings,
Agents..

page_text: COMPLETE
SPECIFICATION,
I WILLIAM HENRY THOMPSON of 14 Devonshire Square, Bishopsgate Street in
the County of Middlesex, Engineer, do hereby declare the nature of my Invention
for IMPROVEMENTS IN MILLS FOR CRUSHING, GRINDING OR PULVERIZING AND
AMALGAMATING OR MIXING VARIOUS SUBSTANCES, and in what manner the same
is to be performed to be particularly described and ascertained in and by the
following statement, reference being had to the drawing hereunto annexed, and to
the figures and letters marked thereon that is to say :-
The drawing represents an elevation partly in section of a mill having my
improvements applied thereto.
The invention relates to improvements in that class of mill in which crushing
balls or rollers or masses of metal or other material are employed in connection
with a fixed or moveable circular track or way.
Heretofore when these tracks or ways have been made of one piece of steel, they
have been made of considerable thickness in order to obtain the required strength
and at the same time to provide enough material to allow for the wear which
always takes place in such class of tracks or ways.
This however has the disadvantage that when the maximum wear has taken
place the worn track or way has to be removed from the mill and a new one
inserted in its place thereby causing considerable pecuniary loss as even in countries
where there is a ready market for such material it could only be sold at the price
of scrap steel whilst in countries where such sale could not readily be affected it
would become simply a waste product which would soon become inconvenient on
account of its bulk. Such tracks or ways as heretofore constructed are of
considerable first cost.
Now according to my present invention I form such tracks or ways of two
rings a, a the backing ring a being by preference of good wrought iron, although
mild steel, homogeneous metal or other suitable material may be used whilst the
wearing ring or portion a' is made of steel as usual..
The backing ring a is made of suitable proportions to furnish the required
strength whilst the wearing ring a¹ is of thickness only a little more than sufficient
to provide for the maximum amount of wear.
These two rings are united by shrinking the one upon the other or in any suitable
manner for instance the outer ring may be expanded by heat and then shrunk upon
the wearing ring or the latter may be cut and sprung into place.
By my improved construction, when the wearing ring a¹ has been so much worn
as to be useless it is removed from the backing ring a and a new wearing ring is
inserted in its place by which means the amount of loss in waste material is reduced
to a minimum,

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
In machinery of the class hereinbefore referred to, forming the track or way of a
wearing ring a¹ and a backing ring a substantially as shown and described and for
the purpose stated.
W. H. THOMPSON,
By Harris & Mills,
23, Southampton Buildings,
Agents.