IMPROVEMENTS IN MACHINERY FOR GRINDING AND PULVERIZING BARK, BONE, LOCUST BEANS, AND OTHER ANIMAL, VEGETABLE, AND MINERAL SUBSTANCES."
Year: 1880

page_text: LETTERS PATENT to George Burman and William Howroyd Firth, of Dewsbury,
in the County of York, Engineers, for an Invention of "IMPROVEMENTS IN
MACHINERY FOR GRINDING AND PULVERIZING BARK, BONE, LOCUST BEANS,
AND OTHER ANIMAL, VEGETABLE, AND MINERAL SUBSTANCES."
PROVISIONAL SPECIFICATION left by the said George Burman and William
Howroyd Firth at the Office of the Commissioners of Patents on the 15th
January 1880.
GEORGE BURMAN and WILLIAM HOWROYD FIRTH, of Dewsbury, in the County of
York, Engineers. "IMPROVEMENTS IN MACHINERY FOR GRINDING AND PULVERIZING
BARK, BONE, LOCUST BEANS, AND OTHER ANIMAL, VEGETABLE, AND MINERAL
SUBSTANCES."
The improvements consist in the use and employment of a box or casing, the
two sides of which are corrugated and have openings or perforations therein, so
that when the blades of the revolving beater are passing within the box or casing
the action of the said beaters against the corrugations will grind and pulverize the
material, and at the same time allow it to escape through the openings all along
the two sides of the box or casing. The face or bottom of the box or casing may
also be corrugated, so that we obtain three grinding surfaces, two of which are
perforated to allow the material to escape.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, and of
an Order of the Lord Chancellor, filed by the said George Burman &
William Howroyd Firth in the Great Seal Patent Office on the 22nd July
1880.
GEORGE BURMAN and WILLIAM HOWROYD FIRTH, of Dewsbury, in the County
of York, Engineers. " IMPROVEMENTS IN MACHINERY FOR GRINDING AND
PULVERIZING BARK, BONES, LOCUST BEANS, AND OTHER ANIMAL, VEGETABLE,
AND MINERAL SUBSTANCES."
The improvements consist in the use and employment of a box or casing, the
two sides of which are corrugated and have openings or perforations therein, so
that when the blades of the revolving beater are passing within the box or casing
the action of the said beaters against the corugations will grind and pulverize the
material, and at the same time allow it to escape through the openings all along
the two sides of the box or casing. The face or bottom of the box or casing may
also be corrugated, so that we obtain three grinding surfaces, two of which are
perforated to allow the material to escape.
The
In order that this Invention may be more fully understood reference is made to
the accompanying Sheet of Drawings illustrative thereof. Fig. 1 is outside
elevation, Fig. 2 is section, Fig. 3 is plan with the upper cover A removed, and
Fig. 4 is section taken through the line a, b, in Fig. 2. B are the beaters which
revolve within the casing C, the two inner cheeks or sides being corrugated as at d,
shewn more clearly in Fig. 2, as well as the bottom, or all around the face e.
material is supplied by the hopper D, and is forced by the beaters against the
corrugations and ground or pulverized thereby, the material or ground parts
escaping through the openings f formed in the two sides of the casing C. By this
means considerably more material can be ground in a given time than by machines
as at present constructed.
Having now described the nature and particulars of our Invention, and shewn
by Drawings how the same is to be performed or carried into practice, we would
have it understood that we do not confine ourselves to the exact details herein
shewn and described, such as the number, size, or shape of openings f, but what we
do claim is,-
Firstly. Forming or making corrugations d on two or three of the grinding
surfaces, for the purpose substantially as herein shewn and described.
Secondly. The use of the perforations or openings f, for the purpose substantially
as herein shewn and described.
In witness whereof, we, the said George Burman and William Howroyd Firth,
have hereunto set our hands and seals, this Ninth day of July, in the year
of our Lord One thousand eight hundred and eighty.