Improvements in or applicable to Grinding Mills.
Year: 1890

page_text: Date of Application, 2nd Aug.. 1890
Complete Specification Left, 5th Jan., 1891-Accepted, 7th Feb., 1891
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Grinding Mills.
We, WILLIAM JOHN FRASER and THOMAS CASSIENET PALMER, both of
98 Commercial Road, in the County of London, Engineers, do hereby declare the
nature of this invention to be as follows:-
:-
Our invention relates to grinding mills having edge running wheels or rollers,
and has for its object to provide means whereby the danger heretofore existing in
the operation of putting the scrapers into or out of action is avoided.
In carrying out our invention we connect the levers moving the scrapers to a
ring or collar adapted to slide upon the main vertical shaft and to rotate
therewith.
In connection with this collar is a hand lever fulcrummed on the framing and
engaging with its forked end in a circumferential slot in the said ring or collar so
that by this or by an equivalent mechanical motion of the levers the scrapers are
put in or out of action according to the direction in which the lever is moved.
Suitable provision is made for retaining the said lever in either of the positions
into which it is moved so as to hold the scrapers in or out of action.
This arrangement in addition to the advantage before referred to, has the further
advantage that it permits of enclosing the apparatus in a case.
Dated the 2nd day of August 1890.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or applicable to Grinding Mills.
We, WILLIAM JOHN FRASER, and THOMAS CASSIENET PALMER, both of
98, Commercial Road, in the County of London, Engineers, 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:-
Our invention relates to grinding mills having edge running wheels or rollers,
and has for its object to provide means whereby the danger heretofore existing in
the operation of putting the scrapers into or out of action is avoided.
In carrying out our invention we connect the levers moving the scrapers to
a ring or collar adapted to slide upon the main vertical shaft and to rotate
therewith.
In connection with this collar is a hand-lever fulcrummed on the framing and
engaging with its forked end in a circumferential slot in the said ring or collar, so
that by motion of the said levers the scrapers are put into or out of action according
to the direction in which the lever is moved.
Suitable provision is made for retaining the said lever in either of the positions
into which it is moved.
This arrangement, in addition to the advantage before referred to, has the further
advantage that it permits of enclosing the apparatus in a dust-tight case with sliding
doors.
To enable our invention to be fully understood we will describe the same with
reference to the accompanying drawing, in which :-
Figure 1 is a sectional elevation of a grinding-mill provided with our improve-
ments, the runners being shewn in edge view; and,
Figure 2 is a similar view but shewing one of the runners removed and the other
in side elevation.

page_text: a, a indicate the edge-runners, indicates the bed or surface upon which the said
runners roll, e indicates the main vertical shaft, and d indicates the axle upon which
the edge-runners rotate and which passes through a slot in the said vertical shaft.
e, are the scrapers one of which, as is usual, serves for moving the material to
be ground into the circular path of the edge-runners, and the other for moving the
material off the bed after it has been sufficiently ground. g, hare vertical rods by
which the scrapers are respectively carried, and are the levers through the
medium of which the scrapers are moved, the said levers being pivoted upon a
boss upon the axle d in the ordinary manner.
is the collar sliding upon the main vertical shaft c, and m is the lever pivoted
to the framing and having at its forked end pins n, projecting into a groove in
the said collar. o, o are rods connecting the collar with the levers i, j.
With this arrangement it will be obvious assuming the collar to be in the
position shewn in the drawing and the scraper e in contact with the bed, that if the
lever mis moved in the direction of the arrow, Figure 1, the said collar will be
lowered upon the shaft, whereby the scraper / will be brought into contact with
the bed and the scraper e removed therefrom, and that by moving the lever in the
reverse direction the scraper e will again be brought into contact with the bed and
the scraper again raised.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what we
claim is
In a grinding mill requiring the use of scrapers, raising, lowering and regulating
the said scrapers by means of a lever or levers, substantially as described.
Dated the 5th day of January 1891
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicants.