IMPROVEMENTS IN MILLS FOR GRINDING QUARTZ, AND OTHER HARD SUBSTANCES
Year: 1871

page_text: LETTERS PATENT to George Haseltine, of the Firm of Haseltine, Lake,
& Co., Patent Agents, Southampton Buildings, London, for the
Invention of "IMPROVEMENTS IN MILLS FOR GRINDING QUARTZ, AND OTHER
HARD SUBSTANCES."-A communication from abroad by Gove Mitchell,
of Philadelphia, Pennsylvania, United States of America.
Sealed the 24th October 1871 and dated the 31st August 1871.
COMPLETE SPECIFICATION filed by the said George Haseltine at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 31st August 1871, pursuant to the 9th Section
of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
HASELTINE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London, send greeting.
WHEREAS, I am in possession of an Invention for "IMPROVEMENTS IN
MILLS FOR GRINDING QUARTZ AND OTHER HARD SUBSTANCES," and have
petitioned Her Majesty to grant unto me, my executors, administrators,
and assigns, Her Royal Letters Patent for the same, and have made

page_text: solemn Declaration that it has been communicated to me from abroad
by Gove Mitchell, of Philadelphia, Pennsylvania, United States of
America.
NOW KNOW YE, that I, the said George Haseltine, do hereby declare
that the following Complete Specification, under my hand and scal, t
fully describes and ascertains the nature of the said Invention, and in
what manner the same is to be performed in and by the following
statement, reference being had to the accompanying Drawing forming
a part of this Specification:-
The object of my Invention is the construction of a mill for grinding 1
quartz, guano, phosphates, and other hard substances that shall first
reduce such substances to a powdered condition and then discharge
them so reduced by a blast of air.
My improvements consist in the construction, combination, and
arrangement of the several parts of the mill as herein-after set forth.
DESCRIPTION OF THE DRAWING.
Figure 1 is a perspective view of the said mill, one head of the casing
being removed to expose the parts enclosed. Figure 2 is a similar view
of the inner face of a section or half of either head of the casing;
Figure 3 is a similar view of a pounding wheel, adjustable hammers, 2
flanges, recesses, and bosses herein-after described; Figure 4 is a similar
view of a part of the casing and its serrated lining. Figures 3 and 4,
are drawn to an enlarged scale. Similar letters designate similar parts
in the several Figures.
In Figure 1, a shews one of two similar standards employed to support 2
the shaft b, the standards a are intended to be attached to any sub-
stantial base; c is the casing, which I prefer to make of cast iron in one
piece, this casing o is partly lined with the serrated plates d in sections,
keyed at e, and further secured by means of raised strips or flanges f;
Figures 2 and 4 formed on or secured to the inner sides of the two 3
similar heads respectively. In Figures 1 and 3 g is the aforesaid
pounding wheel; it is mounted on the horizontal shaft b, to which
power is applied. The hammers are inserted into recesses formed
for them in the body of the wheel g, as shown. They are adjustable,
having the capacity of being set out by means of the screw bolts i as 3
their projected or striking ends are worn down by use. A number of
separate metallic strips ; laid together between a shoulder of the

page_text: hammer and a shoulder m of the wheel (see Figure 3) are employed
as packing, one or more of the said strips being removed as required;
when the hammers h are to be set out, shallow recesses n Figure 3 onc
in front of each hammer are formed in the edge of the wheel g. These
recesses cause the hammers h to wear down nearly square, thus obviating
the tendency which the said hammers would otherwise have to bevel
from their striking faces respectively. The backs or striking surfaces
of the recesses n act as fans and materially assist in clearing the mill
of ground materials and in preventing the heating of the hammers.
For their protection against wear these backs may each be covered
with a removeable plate (not shown) which may be secured by the
screw bolts o passing through said backs and abutting against said
hammers respectively. Flanges p are formed on or secured to each
side of the pounding wheel g. These flanges are made to about fill the
spaces between the wheel and the heads of the casing. They act as
fans, and by the blast which they generate keep the ground materials
from settling about the shaft b and clogging the wheel. The heads of
the casing (see Figure 2) are preferably made flat, and have ordinary
stuffing boxes applied to them outside around the shaft 6 of the pounding
wheel, and they fit close up to the flanges p, but not so close as to
interfere with the motion of the pounding wheel. q, Figure 1, is an
aperture in the rim of the casing through which the materials to be
ground are introduced; is another aperture in the rim through which
the ground materials are discharged in a powdered state. The aperture q
is intended to be surmounted with a hopper, and to the aperture r there
is attached an ordinary spout or tube varying in length from three feet
upwards according to the degree of fineness to which it is desired to
reduce the materials; s, Figure 1, is a removeable and adjustable plato
employed to direct. the blast and ground materials out of the mill
through the aperture r. The several parts of the mill may be made of
iron or steel, cast or wrought.
Having thus fully described the said Invention, as, communicated to
me by my foreign correspondent, and shown how the same may be
conveniently and advantageously carried into practice, I claim,—
First. The combination of the pounding wheel g, adjustable hammers h,
recesses n, fanning flanges p, enclosing casing c, segmental serrated
linings d, and adjustable blast director 8, substantially in the manner
and for the purpose set forth.
"

page_text: Second. In combination the pounding wheel g, recesses n, and adjustable
hammers h, substantially in the manner and for the purposes set forth.
Third. The pounding wheel constructed with the recesses n and
fanning flanges p substantially as set forth for the purposes specified.
Fourth. In combination tho pounding whcel g, removeable segmental
serrated linings d of the casing, and the securing flanges f, substantially
in the manner and for the purpose set forth.
In witness whereof, I, the said George Haseltine, have hereunto
set my hand and seal, this Thirty-first day of August, in the
year of our Lord. One thousand eight hundred and seventy-
one
Witness,
21°
W. J. LOWE.
GEORGE HASELTINE. (L.S.)