Improvements in Grinding Mills, Paint Levigators, and the like.
Year: 1897

page_text: Date of Application, 18th Feb., 1897
Complete Specification Left, 18th Nov., 1897-Accepted, 18th Dec., 1897
PROVISIONAL SPECIFICATION.
Improvements in Grinding Mills, Paint Levigators, and the like.
We, JOHN CRONE, of 11 Sefton Drive, Liverpool, Chemical Manure Manufacturer,
DAVID CRONK TAYLOR, of Ashbourne House, Rainhill, Chemical Manure Manufacturer,
and HARRY CLAYTON SHAW, of Holly Cottage, Rainhill, Manager, all in the
county of Lancaster, do hereby declare the nature of this invention to be as
follows;
This invention relates to that class of mills in which the material fed into the mill
is either levigated or triturated between a lower fixed bedstone and a runner stone;
the latter being carried and driven by a vertical spindle located centrally with
reference to the stones; the material to be operated upon is fed through a central open-
ing in the runner stone, and it is found exceedingly difficult in practice to efficiently
lubricate the bearing of the spindle and maintain the latter in a perfectly vertical
position; difficulty is also experienced in preventing the material which is being
ground from entering the bearing where, of course, its action is rapidly destructive.
In the Specification to Letters Patent No. 17625 dated 15th October, 1891, granted
to the present applicants, a mode of construction is shown which effectually overcomes
the difficulties referred to, but which in some respects is not suitable for stones of
small diameter, which of course have a correspondingly small central opening, and
the object of the present invention is to provide a mill in which the difficulties
referred to are overcome by a construction which is equally applicable to large or
small stones.
According to our invention we construct mills as follows;-
We provide a main casing, pan or centrepiece on the bottom of which the bedstone
rests, and which is provided with the usual outlet and means for adjusting the
position of the bedstone; we prefer to form the central bearing for the spindle
integral with the pan, the metal of which is therefore carried up through the
bedstone to a level at least as high as the top of the runner stone. We provide two
gun-metal bushes, one at the bottom of the central stalk so formed, and one at the
top thereof; the latter bush has a large flange which is cupped so as to form an oil
reservoir, which reservoir is covered in by a circular cap with a depending flange
which fits the outside of the flange of the bush; the spindle passes through this cap
which is made a close fit on the spindle and provided with the usual means for
supplying lubricant to the reservoir; an absorbent pad may be fitted in tne reservoir,
to intercept any material which might accidentally pass the cap.
Instead of the oil reservoir above described we prefer in some cases to use, in
combination with our present improvements, the reservoir described in our prior
specification referred to.
To enable the runner stone to be properly balanced, the upper end of the spindle
is provided with forged jaws between which the cock-head is fitted.
The driving bar rests on the cock-head and is rotated by the jaws which thus
form a simple and effective driving box; this arrangement takes up the least possible
room in the eye of the stone and is much superior to the usual form of driving
box.

page_text: When the mill is to be used as, say, a paint levigator, an eye tin is fitted extending
above the top of the spindle, so that while the cage can be filled with paint to
the top of the runner stone, splashing by the driving bar is prevented.
It will be seen that by carrying the central bearing above the runner stone,
access to the bearing by the material is absolutely prevented, and efficient lubrication
is adequately provided for, which are matters of the utmost importance in mills of
this description; at the same time the construction described greatly facilitates the
driving and removal of the runner stone and is one which can be equally well applied
to stones of large or small diameter.
In other respects, such as the means for driving the spindle, etc., the usual form of
construction may be adopted.
With suitable modifications of the driving head, our improvements may be applied
to either under-driven or over-driven mills.
SLOAN & LLOYD BARNES
Castle Chambers, 26 Castle Street, Liverpool.
Agents for the Applicants.
Improvements in Grinding Mills, Paint Levigators and the like.
We, JOHN CRONE, of 11 Sefton Drive, Liverpool, Chemical Manure Manufacturer,
DAVID CRONK TAYLOR, of Ashbourne House, Rainhill, Chemical Manure Manufacturer,
and HARRY CLAYTON SHAW, of Holly Cottage Rainhill, Manager, all in the county of
Lancaster, 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;-
This invention relates to that class of mills in which the material fed into the
mill is either levigated or triturated between a lower fixed bedstone and a runner
stone the latter being carried and driven by a vertical spindle located centrally with
reference to the stones; the material to be operated upon is fed through a central
opening in the runner stone, and it is found exceedingly difficult in practice to
efficiently lubricate and secure the bearing of the spindle and maintain the latter in
a perfectly vertical position; difficulty is also experienced in preventing the material
which is being ground from entering the bearing, where, of course, its action is
rapidly destructive. In the Specification to Letters Patent No. 17625 dated
15th October, 1891, granted to the present applicants, a mode of construction is
shown which effectually overcomes the difficulties referred to, but which in some
respects is not suitable for stone of small diameter, which of course have a
correspondingly small central opening, and the object of the present invention is to
provide a mill in which the difficulties referred to are overcome by a construction
which is equally applicable to large or small stones.
According to our invention we construct mills as follows, reference being made to
the accompanying drawings in which, Fig. I is an elevation in section on the
line A. A., Fig. II a plan with the upper part of the casing removed, and Fig. III a
detail view of the driving head in section on the line B. B.
We provide a main casing, pan or centrepiece on the bottom of which the bedstone
rests, and which is provided with the usual outlet and means for adjusting the
position of the bedstone: we prefer to form the central bearing for the spindle
integral with the pan, the metal of which is therefore carried up through the bedstone
to a level at least as high as the top of the runner stone. We provide two gun-metal
bushes, one at the bottom of the central stalk so formed, and one at the top thereof:

page_text: the latter bush has a large flange which is cupped so as to form an oil reservoir, which
reservoir is covered by a circular cap with a depending flange which fits the outside
of the flange of the bush the spindle passes through this cap which is made a close
fit on the spindle and provided with the usual means for supplying lubricant to the
reservoir an absorbent pad may be fitted in the reservoir, to intercept any material
which might accidentally pass the-cap.
Instead of the oil reservoir above described we prefer in some cases, to use, in
combination with our present improvements, the reservoir described in our prior
specification referred to.
To enable the runner stone to be properly balanced, the upper end of the spindle
is provided with forged jaws between which the cock-head is fitted.
The driving bar rests on the cock-head and is rotated by the jaws which thus form
a simple and effective driving box: this arrangement takes up the least possible room
in the eye of the stone and is much superior to the usual form of driving box.
When the mill is to be used as, say, a paint levigator, an eye tin is fitted extending
above the top of the spindle, so that while the cage can be filled with paint to the top
of the runner stone, splashing by the driving bar is prevented.
It will be seen that by carrying the central bearing above the runner stone, access
to the bearing by the material is absolutely prevented, an efficient lubrication is
adequately provided for, which are matters of the utmost importance in mills of this
description at the same time the construction described greatly facilitates the
driving and removal of the runner stone and is one which can be equally well applied
to stones of large or small diameter.
Referring now to the drawings which illustrate, by way of example, a mill
constructed according to our invention :-
1 is the main casing upon which the bedstone 2 rests. The casing is provided with
an outlet 3 and screws 4 to adjust the bedstone laterally and screws 5 to level it.
The upper portion of the mill is covered in by means of a light casing 11.
6 is the central bearing stalk which is shown integral with the casing 1: 7 is the
lower gun metal bush and 8 the upper bush which latter is located, as shown, so
that its top is above the level of the top of the runner stone 9. The top of the bush 8
is recessed so as to form an oil reservoir 10 which is covered by the cap 11.
The upper part of the spindle 12 is provided with jaws 13 between which the
cock-head 14 is fitted.
The driving bar 15 on which the runner stone is balanced rests on the cock-head
and is driven by the jaws 13, and the latter are strengthened by a bridge piece 16
secured in position by bolts 17.
The driving head is attached to the runner stone in the usual manner at 18.
In other respects, such as the means for driving the spindle, etc., the usual form of
construction may be adopted.
With suitable modifications of the driving head, our improvements may be applied
to either under driven or over driven mills.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what
we claim is :-
1. The improvement in mills of the kind herein described which consists in
carrying the central bearing stalk up to or above the level of the top of the runner
stone and forming the bearing in two parts, one at the bottom of the stalk and one
at the top thereof, so as to form a rigid, easily lubricated dirt-proof bearing whose
upper end (which is the only one through which the material operated upon can
enter) is above the level of the said material; substantially as described and
illustrated.
2. The improvement in mills of the kind herein described which consists in
forming the spindle with forged jaws to engage with the driving bar, and in carrying
the central bearing stalk up to of above the level of the top of the runner stone and
forming the bearing in two parts, one at the bottom of the stalk, and one at the top

page_text: thereof, so as to form a rigid, easily lubricated dirt-proof bearing whose upper end
(which is the only one through which the material operated upon can enter) is above
the level of the said material; substantially as described and illustrated.
3. The combination and arrangement of parts forming the improved mill
substantially as described and illustrated.
SLOAN & LLOYD BARNES
Castle Chambers, 26 Castle Street, Liverpool. Agents for the Applicants.