IMPROVEMENTS IN. ROLLS FOR CRUSHING OR REDUCING MINERAL, CEREAL OR LIKE SUBSTANCES, SPECIALLY APPLICABLE FOR CRUSHING WET SLACK to be as follows:
Year: 1884

page_text: I, JOHN QUALTER, of the Railway Foundry, Barnsley, in the county of York,
Engineer do hereby declare the nature of my invention for "IMPROVEMENTS IN.
ROLLS FOR CRUSHING OR REDUCING MINERAL, CEREAL OR LIKE SUBSTANCES,
SPECIALLY APPLICABLE FOR CRUSHING WET SLACK to be as follows:-
"
This invention has for its object the manufacture of an improved kind of rolls
specially applicable to the roller mill for which I obtained Letters Patent on the
13th day of February 1882 N° 693 and to mills of such type where crushing rolls
are driven by friction, one off the other.
The object of my invention is to provide rolls in which better frictional contact
is obtained.
In carrying out my invention for example as applied to the mill described in the
specification of the said Letters Patent, I cast or form rolls with spiral or inclined
grooves running parallel with each other.
These grooves are formed of such a size and depth as to be capable of receiving
strips of wood, cane, or like material, or soft metal, which are fixed into the
grooves by cementing in the same or in other suitable manner. The nature of the
wood, cane or like material must be varied to suit the purpose for, which the roll
is adapted.
The rolls are set in the mill with the grooves running at angles to each other,
by which means, good frictional contact and grinding or crushing action is
obtained.
These rolls are specially applicable to crushing wet slack, or like material, which
is difficult to crush with ordinary metallic rollers.
The rolls also can be used to crush dry grain, or seeds, slack salt, cement, slag
or like substances.
When worn fresh wood or like strips can be replaced in the grooves of the roll.
The shape of the grooves can be varied as desired.
Dat th
TOLL
1007
POPPLEWELL, COLTON & Co.,
Agents for the Applicant.

page_text: Improvements in Rolls for Crushing or Reducing Mineral,
Cereal, or like Substances, Specially Applicable for Crushing
DE MULTICATION.
I JOHN QUALTER of the Railway Foundry Barnsley in the County of York
Engineer do hereby declare the nature of my invention for IMPROVEMENTS IN
ROLLS FOR CRUSHING OR REDUCING MINERAL CEREAL OR LIKE SUBSTANCES
SPECIALLY APPLICABLE FOR CRUSHING WET SLACK and in what manner the same
is to be performed, to be particularly described and ascertained in and by the
following statement :—
This invention has for its object the manufacture of an improved kind of rolls
specially applicable to the roller mill for which I obtained Letters Patent on the
13th day of February 1882 No 693 and to mills of such type where crushing rolls
are driven by friction one off the other.
The object of my invention is to provide rolls in which better frictional contact
is obtained.
In carrying out my invention for example as applied to the mill described in the
specification of the said Letters Patent I cast or form rolls with spiral or inclined
or other suitable grooves running parallel with each other.
These grooves are formed of such a size and depth as to be capable of receiving
strips of wood, cane, or like material, or soft metal, which strips are fixed into the
grooves by cementing in the same or in other suitable manner. The nature of
the wood, cane, soft metal or like material must be varied to suit the purpose for
which the roll is adapted.
The rolls are set in the mill with the inclined or spiral grooves running at
angles to each other, by which means good frictional contact and grinding or
crushing action is obtained.
These rolls are specially applicable for crushing wet slack or like material, which
is difficult to crush with ordinary metallic rollers.
The rolls also can be used to crush dry grain, or seeds, slack salt, cement, slag or
like substance.
When worn fresh strips can be replaced in the grooves of the roll.
The shape of the grooves can be varied as desired.
°
The accompanying drawings show a pair of rolls with inclined grooves con-
structed according to my invention.
Fig 1 being an elevation.
Fig 2 an end view in section.
A is the cast body of the roll (preferably a chilled casting) the grooves being
formed in the mould so as to produce the same on the cast roll.
B are these grooves. C the filling-in strips. I find in my experiments that
lignum vitae has given me the best results when using wood as it appears to stand
the wet in crushing wet slack, the pit water appearing, from being charged with or
containing mineral salts, to injure soft woods or some metals, and when using wood
I prefer to use lignum vitae or wood of like nature such as ironwood, or woods
which do not shrink or warp.

page_text: When using soft metal strips for rollers for crushing wet slack I prefer to use a
metal composed of lead and antimony. Various alloys of antimony and lead are
well known, and the one used must depend on the required degree of hardness of
the metal strips. Or I may use other metals or alloys not liable to be attacked by
the pit water, or in crushing salt or chemicals in a wet or moist condition metals
or alloys not liable to corrosion.
I might use Muntz metal for some purposes or like alloy.
For crushing seeds, grains, or like vegetable substances I may use lignum vitae
strips, or soft brass or gunmetal or bronze, and I do not confine myself to the
aforesaid descriptions of soft metal used to fill up the grooves.
In place of lignum vitae I may sometimes use oak, ash, hornbeam, crab-tree,
apple, beech or other hard wood of a similar nature.
By the term "soft metal" in this specification I mean relatively soft as
compared with the surfaces of the roll proper.
If desired I may alternate the soft metal and lignum vitae strips.
The more or less hard wood or soft metal strips must be put in the grooves so
that when the roller is finished, the strips are slightly below the surface of the
roller thereby securing better frictional contact.
To fix in the strips of metal I preferably use pressure driving them in tight.
The wood strips are also driven in by pressure and cemented.
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
1st Constructing rolls for the purposes herein before described with alternate
(relative) hard and soft surfaces or strips on their working faces substantially as
described.
2nd The use of lignum vitae or other suitable wood or of soft metal or alloy to
fill grooves formed on the working faces of rolls for crushing or reducing
substantially as described.