IMPROVEMENTS IN GRINDING PANS APPLICABLE TO MORTAR MILLS AND OTHER APPARATUS FOR GRINDING CLAY AND OTHER SUBSTANCES
Year: 1875

page_text: LETTERS PATENT to Julius Frederick Moore Pollock, of Leeds, in the
County of York, Engineer, and Henry Powley, of Waterloo Road,
Manchester, in the County of Lancaster, Engineer, for the In-
vention of "IMPROVEMENTS IN GRINDING PANS APPLICABLE TO MORTAR
MILLS AND OTHER APPARATUS FOR GRINDING CLAY AND OTHER SUBSTANCES.”
Sealed the 28th December 1875, and dated the 14th July 1875.
PROVISIONAL SPECIFICATION left by the said Julius Frederick
Moore Pollock and Henry Powley at the Office of the Com-
missioners of Patents, with their Petition, on the 14th July
1875.
We, JULIUS FREDERICK MOORE POLLOCK, of Leeds, in the County
of York, Engineer, and HENRY POWLEY, of Waterloo Road, Manchester.
in the County of Lancaster, Engineer, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN GRINDING PANS APPLICABLE
TO MORTAR MILLS AND OTHER APPARATUS FOR GRINDING CLAY AND OTHER
SUBSTANCES," to be as follows:-
This Invention consists in a new method of constructing grinding
pans for mortar mills and for other grinding apparatus, so that the

page_text: delivery of the ground material may be self-acting, or nearly so, and
the ordinary system of shovelling the clay or other ground material
out by hand may be dispensed with. For this purpose we make the
bed or bottom of the pan separate from the rim, and we arrange the
bed or bottom to rotate independently of the rim which we provide
with a moveable part arranged to act when required as a transferring
plate or scraper, or two or more such moveable parts may be used.
In carrying out our Invention with one such moveable part a disc
is substituted for the pan bottom as usually constructed, such disc being
flat on the top side with no rim or other projection except the boss at
its centre through which the motive shaft passes. Above and round
this disc is placed a stationary metal ring fixed by suitable means so as
to form a rim round the disc, and provided at a suitable point with a
hinged door opening inwards. The direction of motion of the disc is
from the opening end of this door towards its hinge, so that when the
door is opened inwards, which is effected by handles and levers suitably
constructed, it will project over the disc on and by which the ground
material is being carried round, and acting as a scraper will cause the
ground material to diverge from its rotative course, and by passing
along the inclined face presented by the opened door to deliver itself
outside the disc or pan without the usual shovelling or other manual
assistance.
The handle or lever for opening and closing the door is arranged
so as to press it down on to or towards the upper surface of the disc or
pan bottom when opened, and thus to counteract the tendency of the
clay or other ground material passing under it to lift it up.
The inner side of the door may also be fitted with a plate curved
inwards towards the centre of the disc or pan, so that when the door
is closed this plate may act as a scraper to throw the material to be
ground inwards.
Any portions of the substance under treatment that may fall between
the rim or ring and the periphery of the rotating disc or bottom may
be received by an annular trough or vessel arranged below, and into
which flappers or scrapers carried by the rotating portion of the
apparatus may be caused to dip so as to move the contents of the {
annular trough or vessel to and discharge same at any convenient
point.

page_text: It will be obvious that a moving rim or ring may be substituted for
the stationary one above described if arranged to travel at a different
speed or in the opposite direction to the disc or bottom.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Julius Frederick Moore Pollock and Henry Powley
in the Great Seal Patent Office on the 13th January 1876.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, JULIUS
FREDERICK MOORE POLLOCK, of Leeds, in the County of York,
Engineer, and HENRY POWLEY, of Waterloo Road, Manchester, in
the County of Lancaster, Engineer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of July, in the year
of our Lord One thousand eight hundred and seventy-five, in the thirty-
ninth year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto us, the said Julius Frederick Moore Pollock
and Henry Powley, Her special license, that we, the said Julius
Frederick Moore Pollock and Henry Powley, our executors, admini-
strators, and assigns, or such others as we, the said Julius Frederick
Moore Pollock and Henry Powley, our executors, administrators, and
assigns, should at any time agree with, and no others, from time to
time and at all times thereafter during the term therein expressed,
should and lawfully might make, use, exercise, and vend, within the
United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "IMPROVEMENTS IN GRINDING PANS
APPLICABLE TO MORTAR MILLS AND OTHER APPARATUS FOR GRINDING CLAY AND
OTHER SUBSTANCES," upon the condition (amongst others) that we, the
said Julius Frederick Moore Pollock and Henry Powley, our executors
or administrators, by an instrument in writing under our, or their, or ono
of our or their hands and seals, should particularly describe and ascertain
the nature of the said Invention, and in what manner the same was
to be performed, and cause the same to be filed in the Great Seal Patent
Office within six calendar months next and immediately after the dato
of the said Letters Patent.

page_text: NOW KNOW YE, that I, the said Julius Frederick Moore Pollock,
for myself and on behalf of the said Henry Powley, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement thereof, and the Sheet of Drawings therein
referred to (that is to say) :-
This Invention consists in a new method of constructing grinding
pans for mortar mills and for other grinding apparatus, so that the
delivery of the ground material may be self-acting, or nearly so, and
the ordinary system of shovelling the clay or other ground material
out by hand may be dispensed with. For this purpose we make the
bed or bottom of the pan separate from the rim, and we arrange the
bed or bottom to rotate independently of the rim, which wo provide
with a moveable part arranged to act when required as a transferring
plate or scraper, or two or more such moveable parts may be used.
In carrying out our Invention with one such moveable part a disc
is substituted for the pan bottom as usually constructed, such disc being
flat on the top side with no rim or other projection except the boss at
its centre through which the motive shaft passes. Above and round
this disc is placed a stationary metal ring fixed by suitable means so as
to form a rim round the disc, and provided at a suitable point with a
hinged door opening inwards. The direction of motion of the disc is
from the opening end of this door towards its hinge, so that when the
door is opened inwards, which is effected by handles and levers suitably
constructed, it will project over the disc on and by which the ground
material is being carried round, and acting as a scraper will cause the
ground material to diverge from its rotative course, and by passing
along the inclined face presented by the opened door to deliver itself
outside the disc or pan without the usual shovelling or other manual
assistance.
The handle or lever for opening and closing the door is arranged
so as to press it down on to or towards the upper surface of the disc or
pan bottom when opened, and thus to counteract the tendency of the
clay or other ground material passing under it to lift it up.
The inner side of the door may also be fitted with a plate curved
ando taman the contun of thin

page_text: ring g extended downwards for that purpose; f', f¹, are arms projecting
downwards from the under side of the pan f, which revolving in the
annular saucer g³ collect the loose material accumulated in it, which is
delivered at an opening provided for that purpose at any suitable portion
of the under side of the said saucer.
It will be seen that the door g¹ when open passes under one of the
cross bars i, which resists any tendency of the ground material to force
the door upwards.
Having described the nature of our said Invention, and the manner
of carrying the same into practical effect, we desire to have it under-
stood that we do not intend to claim any of the mechanical parts of the
apparatus herein-before shewn and described when taken separately and
apart from the combination or application thereof in manner and for
the purposes herein described; but what we consider to be novel and
original and therefore claim as secured to us by the herein-before in part
recited Letters Patent is, the combination of parts constituting a self-
emptying grinding pan constructed, arranged, and operating substan-
tially as herein described and shewn, and in which the bed or bottom
of the pan is arranged to rotate independently of the rim carrying
the moveable part or parts serving to transfer or remove the ground
material from the pan.
In witness whereof, I, the said Julius Frederick Moore Pollock,
have hereunto set my hand and seal, this Twelfth day of
January, in the year of our Lord One thousand eight hundred and