Improvements in Machines for Grinding or Reducing Lime, Ashes, Sandstone, Limestone, Quartz, and other Minerals or Materials.
Year: 1899

page_text: Date of Application, 13th Oct., 1899
. Complete Specification Left, 12th July, 1900-Accepted, 18th Aug., 1900
Improvements in Machines for Grinding or Reducing Lime, Ashes,
Sandstone, Limestone, Quartz, and other Minerals or Materials.
I, FREDRIC EDWARD WHITHAM, of The Standard Tool Company, Limited,
Mearclough, Sowerby Bridge, in the County of York, Machine Tool Maker, do
hereby declare the nature of this invention to be as follows:-
My invention relates chiefly to a means of adjusting or balancing under-
driven millstones, whereby such millstones may by a single slight adjustment
be exactly balanced so as to compensate for wear at any given part.
It is applicable mainly to machines for grinding lime, engine ashes, sand-
stone, bones, and other materials to a fine powder for use as mortar. to machines
for grinding limestone and other materials for cement, and to machines for the
reduction of quartz and other ores, but it may also be applied to .mills for
grinding certain kinds of grain and for other purposes.
In carrying out my said invention I employ two or three annular rings fitting
around the pan or frame which carries the millstone. Each of the said rings
is cast solid (preferably of rectangular cross-section) for a portion of its length,
the remainder being of a corresponding hollow section. These rings may be
rotated about the pan by any suitable means, either separately or together, thus
allowing the centre of gravity of the said rings to be displaced to any required
extent in any desired direction, so compensating for uneven wear of the mill-
stone and maintaining the whole in perfect balance.
The pan has a central conical sleeve on which the driven millstone fits, the
said sleeve terminating in a dome-shaped bearing for the end of the driving
shaft: This shaft carries a cam which engages a projection on the inner side
of the conical sleeve. The pan also carries a suitable brush.
1000
Improvements in Machines for Grinding or Reducing Lime, Ashes,
Sandstone, Limestone, Quartz, and other Minerals or Materials.
I, FREDRIC EDWARD WHITHAM, of The Standard Tool Company Limited,
Mearclough, Sowerby Bridge, in the County of York, Machine Tool Maker, do
hereby declare the nature of this invention. and in what manner the same
Die17

page_text: is to be performed, to be particularly described and ascertained in and by the
following statement:
My invention relates chiefly to a means of adjusting or balancing under-
driven millstones whereby such millstones may by a slight adjustment be exactly
balanced so as to compensate for wear at any given part.
Also by my improved means, method and position of fixing same hereinafter
described, there is no resistance to, or absorbtion of a large amount of the motive
power required to drive the pan carrying the bed or millstone. Such resistance
and absorbtion of power being occasioned in ordinary underdriven millstones
by the several projecting parts of the balancing mechanism. fixed radially from
the centre underneath the pan coming in contact with the atmosphere as the
pan revolves, the resistance increasing with the speed of the pan or millstone,
so that in high driven millstones the power absorbed by this means is enormous.
With my improvements there are no projecting parts which can offer any
resistance in the manner aforesaid.
My improvements are mainly applicable to machines for grinding lime, engine
ashes, sandstone and other materials to a fine powder for use as mortar to
machines for grinding limestone and other materials for cement, and to machines
for the reduction of quartz and other ores, but it may also be applied to mills
for grinding certain kinds of grain, and for other analogous purposes.
DESCRIPTION OF DRAWINGS.
:
:
Fig. 1 is an elevation of an underdriven millstone with my improved means for
balancing applied.
Fig. 2 is a plan view of one of the rings employed in balancing.
Fig. 3 is a sectional elevation of Fig. 2.
Fig. 4 is a sectional elevation showing my improvements applied and in com-
bination with a wood ring or packing, for obtaining the vertical or ascending
plane of balance required.
In carrying out my said invention I employ two or if necessary three annular
rings A fitting around the pan or frame B which carries the bed or millstone C.
each of the said rings A is cast solid at D (preferably of rectangular cross section)
for a portion of its length, say one sixth, the remainder being of a corresponding
hollow section see Figs. 2 and 3.
These rings may be rotated or moved preferably about the outer periphery
of the pan B, upon a flange B', or upon a metal disc. E carrying the millstone C
(see Figs. 1 and 4), by any suitable, or convenient means either separately or
together, so as to adjust the position of either, or of the several solid parts D
such adjustment allows of the centre of gravity being displaced to any required
extent in any desired direction, so compensating for uneven density or wear of
the millstone and maintaining the whole in perfect balance.
Also I provide a suitable cover L which rests upon the upper ring A and
prevents the product when the millstones are in operation, from accumulating
within the pan or otherwise interfering with the adjustment of the balancing
rings A. this cover L may be secured in position by bolt M or by other means.
The rings A may be secured in a rigid position by any suitable means, so as
to facilitate dispatch in releasing adjusting, and fixing same.
I employ a suitable wood ring or rings N, or other light durable material of
the desired depth, this wood ring N is placed between the balance rings A and
the flange B of the pan B, or disc E, or between the rings A themselves as
desired, preferably before the millstone is mounted within the machine, and is
for assisting in the adjustment of the ascending plane of balance.
By these means while the rings A adjust and obtain a perfect horizontal
balance, the said rings in combination with the ring or packing N, fix and
maintain the ascending or vertical balance of the millstone and pan or disc, the
depth of the wood rings N varying according to the distance the rings A require 5
to be raised in ascertaining the aforesaid vertical balance,

page_text: The pan B has a central conical sleeve F on which the driven bed. or mill-
stone C fits, the said sleeve terminating in a dome shaped bearing G for the end
of the driving shaft H. This driving shaft H carries a cam which engages
with a projection or dog K on the inner side of the conical sleeve.
Having now particularly described and ascertained the nature of this inven-
tion, and in what manner the same is to be performed, I would have it understood
that I am aware that means have previously been employed for balancing mill-
stones, but I declare that what I claim is:-
1. Annular rings such as A with a portion D cast solid, such rings being
adjusted and fixed upon the periphery of the pan B, for the purposes set
forth.
2. Annular rings such as A with a portion D cast solid, such rings being
adjusted and fixed upon the periphery of the pan B or the disc E in combination
with ring or rings N, in the manner and for the purposes set forth.
Dated this Eleventh day of July 1900
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds, and
Crossley Street, Halifax,
Patent Agent for the Applicant.
JOHN E. WALSH,
Royal Exchange Chambers, Boar Lane, Leeds, and
Crossley Street, Halifax,
Patent Agent for the Applicant.