IMPROVE- MENTS IN MACHINERY OR APPARATUS FOR CRUSHING OR PULVERIZING ORES, MINERALS. AND OTHER SUBSTANCES."AL SP
Year: 1878

page_text: LETTERS PATENT to Thomas Henry Tregoning, of Basset Foundry, Pool, in the
County of Cornwall, Engineer and Ironfounder, for the Invention of "IMPROVE-
MENTS IN MACHINERY OR APPARATUS FOR CRUSHING OR PULVERIZING ORES,
MINERALS. AND OTHER SUBSTANCES."
PROVISIONAL SPECIFICATION left by the said Thomas Henry Tregoning
at the Office of the Commissioners of Patents on the 30th January 1878.
THOMAS HENRY TREGONING, of Basset Foundry, Pool, in the County of Cornwall,
Engineer and Ironfounder. IMPROVEMENTS IN MACHINERY OR APPARATUS FOR
"
CRUSHING OR PULVERIZING ORES, MINERALS, AND OTHER SUBSTANCES."
The object of this Invention is the construction of machinery adapted to the
purposes of reducing to the required state gold, silver, copper, tin, and other ores
and minerals, and generally for crushing fine all hard substances.
The machine is driven by steam, water, or horse power, and substantially consists
of two circular plates of unequal sizes, so fixed as to work out of centre of each
other, and making an eccentric motion. These plates are the grinding or crushing
gear of the machine, and are kept at the required distance from each other and
pressure on each other by the adjustment of a weight on a registering lever. The
machine is fed by casting the material to be crushed into a receiving hopper,
whence it passes into a hollow cylinder above the upper plate by an aperture.
After being ground the eccentric motion of the plates forces the material into a
gutter or "launder," whence it is removed in any direction by water or other
means. At the end of the registering lever there is a reversible socket with, say,
four indentations, for the purpose of receiving the spindle, in connection with
bottom crushing plate. The motion is communicated to the upper. plate of the
crusher by means of shaft and driving wheels, whilst the pressure is regulated by
the forcing up or letting down the lower plate by means of the registering lever.
The improvements effected by this machine are a saving in the labor or power
required for working, and an increase of fifty per cent. of stuff or material reduced
in point of time.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Henry Tregoning in the Great Seal Patent Office on the 30th
July 1878.
THOMAS HENRY TREGONING, of Basset Foundry, Pool, in the County of Cornwall,
Engineer and Ironfounder. "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR
CRUSHING OR PULVERIZING ORES, MINERALS, AND OTHER SUBSTANCES.”
The object of this Invention is the construction of machinery adapted to the
purposes of reducing to the required state gold, silver, copper, tin, and other ores
and minerals, and generally for crushing fine or hard substances.
.
The machine is driven by steam, water, or horse power, and substantially consists
of two circular plates of unequal sizes, so fixed as to work out of centre of each
other, and making an excentric motion. These plates are the grinding or crushing
gear of the machine, and are kept at the required distance from each other, and
pressure on each other, by the adjustment of a weight on a registering lever, or by
the adjustment of a screw, placed in some machines instead and in place of the
lever. The machine is fed by casting the material to be crushed into a receiving
hopper, whence it passes into a hollow cylinder above the upper plate by an
aperture. After being ground the excentric motion of the plates forces the material
into a gutter or "launder," whence it is removed in any direction by water or other
means. At the end of, the registering lever there is a reversible socket, with, say,
four indentations, for the purpose of receiving the spindle in connection with
bottom crushing plate. The motion is communicated to the upper plate of the
crusher by means of shaft and" driving wheels, whilst the pressure is regulated by
the forcing up or letting down the lower plate by means of the registering lever or
screw as the case may be.
The machines are adapted to grinding both by wet and dry processes; in the
wet process a bar of metal or wood passes down the centre of the feeding hopper.
The improvements effected by this machine are a saving in the labor or power
required for working, and an increase of fifty per cent. of stuff or material reduced
in point of time.
Figure 1 of the accompanying Drawings is an elevation, partly in section, of a
machine constructed according to this Invention. C and C¹ are two circular plates
working against each other; the upper one C being smaller than the lower one C¹,
and their centres being some distance apart. The material to be crushed or ground
between these plates is supplied to them by being passed into a receiving hopper
or cup D, whence it passes by one or more apertures G into the hollow cylinder G
above the upper plate C. Motion is communicated to the upper plate C by level
gearing F from some revolving shaft R or motor. The cylinder G forming the boss
or nave of the plate C is attached to the upright spindle H, which works in suitable
bearings I on the framing of the apparatus. The plates C, C', are kept at the
required distance apart, and the material to be operated upon obtains the required
crushing pressure by the adjustment of a sliding weight L on a lever A, which may
be marked so as to register the pressure or distance. Or instead of a lever and
weight a combination of levers may be used, or a screw, or wedge, or spring, or
other equivalent appliance for directly or indirectly acting on the step bearing or
socket B for the spindle K of the lower crushing plate C, for the purpose of raising
or lowering the same, and adjusting the pressure as required. The lower plate C¹
is free to revolve in its bearings M and B. The latter may be a reversible socket,
with, say, four indentations, which may be used one after another as they wear
down. After being ground or crushed the material is by the relatively eccentric
motion of the plates C, C¹, forced into a gutter E, whence it is removed in any
direction by water or other means. The gutter E is held by standards O on the
bed plate.
.
Figure 2 is a side elevation, partly in section, and Figure 3 is a front elevation of
a similar apparatus, also made according to this Invention in a somewhat similar

page_text: form, and more particularly adapted to grinding by the wet process. C and C+ are
the two circular plates placed eccentrically; the upper one C is on a hollow shaft H
working in bearings I, I, on the framing, and rotated by wheel gearing F, F, from
a shaft R or motor. The grinding surfaces on the plates C, C', are made to detach
and replace by new ones when worn. D is the hopper which is supplied with the
material to be ground or crushed, and communicating with the interior of the shaft H
and with the hollowed-out part in the middle of the plates C, C₁; the hopper is
stationary, fastened to beams or struts. H' is a disc or shield on the upper part of
the shaft H for protecting the machinery against dirt or injury from the material to
be operated on. d is a central moving stem passing through the hollow shaft H,
and formed with a square at or near the top for turning it by for the purpose of
adjusting its lower end vertically. This stem d tends to spread the material, and
is more particularly adapted to the wet process of crushing. With the view of more
evenly taking the material from all parts of the hopper D the upper part of the
hollow shaft H is fitted or formed with a bush h, which on one side is splayed out
while otherwise cylindrical, or nearly so. E is a gutter, the sides of which are con-
tinued up so as to form a casing around the plates C, C₁, for better preventing loss
of the crushed material. This gutter empties itself by the spout e into a trough N,
and is by water, or otherwise, carried off as required. The gutter e is supported
by standards O on the bed plate part of the framing. The spindle K of the lower
plate C is supported in a step bearing B, which by means of the regulating screw A
can be raised or lowered as required. L and L¹ are nut and check nut for the
same; the screw A is formed with a square for turning it by.
Instead of the screw A other mechanical equivalents may be applied, such as
wedge, lever and weight, or spring.
The lower plate C₁ may obtain a positive rotating movement at a different speed
to that of the upper plate C by means of wheel or other gearing.
And having thus described the nature of the said Invention, and in what manner
the same is to be performed, I declare that I claim,―
First. The application of two plates C, C¹, placed eccentrically and receiving
material to be crushed centrally from the interior of the upper one, substantially as
set forth.
Second. The application of two plates C, C², placed eccentrically and receiving
the material to be crushed centrally from the interior of the upper plate, and fitted
with means for regulating their distance apart, substantially as set forth.
Third. The plates C, C¹, arranged and operating as set forth, in combination with
the gutter E and hopper D, as set forth.
In witness whereof, I, the said Thomas Henry Tregoning, have hereunto set my
hand and seal, this Twenty-ninth day of July, in the year of our Lord One
thousand eight hundred and seventy-eight.
T TI ΤΡΕΛΟΝΤΑΤΑ
T. H. TREGONING. (us.)