Improvements in Apparatus for Pulverising Ores and other Materials.
Year: 1899

page_text: Date of Application, 13th Feb., 1899-Accepted, 25th Mar., 1899
COMPLETE SPECIFICATION.
Improvements in Apparatus for Pulverising Ores and other
Materials.
We, THOMAS MILLS, of Longdown Lodge, Sandhurst, in the County of Berks,
Gentleman, and ROBERT KILLOCH DONALD, of 42, Cadogan Street, Glasgow, in
the County of Lanark, Scotland, Engineer, do hereby declare the nature of this
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement;-
These improvements relate to machines such as are described in the Specifica-
tion of a former Patent granted in Great Britain to Basil John Atterbury
No. 9778 of 1893. These machines are composed of a rocking trough in which
rest a series of rollers of smaller diameter. The material to be crushed is fed into
one end of the trough and is discharged at the opposite end after having passed
in succession below all the rollers.
The rocking trough is made semi-cylindrical or other portion of a cylinder of
uniform radius throughout its length in place of making it in steps as described
in the specification of the above mentioned patent. The trough is also mounted
horizontally and causes the material to be crushed which is fed into the trough at
one end through a hopper as heretofore to be carried forward along the trough
and discharged at the opposite end by a flow of water or other fluid.
To rock the trough two lever arms are attached to it at a distance apart from
one another and movement is given to these lever arms from cranks on a driving
shaft.
A recess is also formed in the bottom of the cylindrical trough below the first
roller in which is placed a removable metal block so that at this point the wear
comes upon the block instead of upon the steel liner plate with which this end
of the trough is lined. In this way there is a great saving in the wear of the
metal of the liner plate as the greatest wear occurs beneath the roller where the
feed enters.
The rockers and rails on which they rest are made in the form of racks gearing
with each other.
An automatic feeder of ordinary construction is provided and the tappet of this
is actuated by a lever the tail end of which is in the path of the first roller. If
the trough is too full the roller is more or less stationary and there is no feed
but when the roller is traversing its whole course or nearly so it comes against
the lever in each oscillation and operates the feed tappet.
Figure is a longitudinal vertical section, and Figures 2 and 3 transverse
sections on the lines 2-2, 3-3, Figure 1.
In its main features the machine closely resembles that described in the Specifi-
cation of the above mentioned British Patent and requires no detailed description.
a is the cradle, b rockers on it made in the form of circular racks rolling on
and gearing with straight racks c. dare riffles between the rollers. e is a feed
hopper at one end of the cradle, and f a door at the other. g is a lever pivotted
at and operating the tappet h of the automatic feeder j. k is a removable block

page_text: of chilled metal. are two levers fixed to the underside of the cradle a and
rocked by the connecting rods m to the cranks n.
Having now particularly described and ascertained the nature of our said in-
vention and in what manner the same is to be performed we declare that what
we claim in connection with apparatus such as is described in the above men-
tioned British Specification is:-
1. The employment of racks for the rockers and rails.
2. The employment of two levers in place of one for rocking the cradle.
3. Providing a removable metal block beneath the first roller.
4. Actuating the tappet of the automatic feeder by a lever in the path of the
first roller.
5. Apparatus substantially as described and shown in the drawings.
Dated this 7th day of February 1899.