Improvements in Grinding Mills.
Year: 1892

page_text: Date of Application, 3rd Mar., 1892
Complete Specification Left, 28th Apr., 1892-Accepted, 28th May,
1892
PROVISIONAL SPECIFICATION.
Improvements in Grinding Mills.
We FREDERICK PEMBERTON of 58 York Road, Northfleet in the County of
Kent. Millstone Builder, and GEORGE MOFFATT RHYS LAYTON of Arlesey.in
the County of Bedfordshire, Cement Manufacturer, do hereby declare the nature
of this invention to be as follows :-
This invention relates to an improved construction of mills for grinding chalks,
clay, cement, lime, limestone, shale, corn and other materials.
By the arrangements at present employed the grinding is effected by the motion
and weight of an upper stone or runner carried on a vertical spindle and revolving
horizontally, pressing the material to be ground against the flat surface of a
stationary horizontal bedstone.
Under these conditions the grinding is only effected by a great expenditure and
waste of power, as the runner stone has no momentum and continually throws its
dead weight upon the engine and other parts of the machinery, while the feeding
of the material into the mill requires constant regulation by the miller in order to
prevent a series of shocks to the machinery and to ensure at all uniform results in
grinding.
The position and action of the stones as usually arranged also cause great wear
and tear to all parts of the machinery and put an unnecessary strain on the engine
or driving power.
The objects of our invention are the employment in a more effective manner than
heretofore of French burr, and other stones which are found to be most suitable
for the purpose; to remedy the above mentioned defects; and to reduce the power
required for grinding.
For these purposes we employ a vertical bedstone concaved on its inner 'or
working face for a suitable depth, and a roller stone revolved vertically by a
horizontal shaft suitably driven, between which roller and the concavity of the
vertical bedstone the material under treatment is ground; such a vertical concave
bedstone is or may be fixed at either side of the roller stone. The said horizontal
shaft is carried in suitable bearings and the whole is or may be enclosed in a frame
of cast iron or suitable material, and means are provided for fixing and adjusting
the position of the bedstone or stones in regard to the roller stone to compensate
for wear.
The roller stone being carried on a horizontal shaft can be constructed of much
lighter weight than the ordinary runner and it requires much less power to drive
it, and the dead weight and wear and tear above described are reduced to a
minimum.
The feed is introduced above the roller stone and is regulated by the position.and
action of the stones.
Sudden shocks to the machinery, and the necessity of constant attention on the
part of the miller are also obviated.
A machine so constructed is suitable for grinding either wet or dry materials.
Dated this 3rd day of March 1892.

page_text: COMPLETE SPECIFICATION.
Improvements in Grinding Mills.
We FREDERICK PEMBERTON of 58 York Road Northfleet in the County of
Kent, Millstone Builder, and GEORGE MOFFATT RHYS LAYTON of Arlesey in
the County of Bedfordshire, Cement Manufacturer, do hereby declare the nature
of this invention and the manner in which the same is to be performed to be
particularly described and ascertained in and by the following statement :-
This invention relates to an improved construction of mills for grinding chalks,
clay, cement, lime, limestone, shale, corn and other materials.
By the arrangements at present employed the grinding is effected by the motion
and weight of an upper stone or runner carried on a vertical spindle and revolving
horizontally, pressing the material to be ground against the flat surface of a
stationary horizontal bedstone.
Under these conditions the grinding is only effected by a great expenditure and
waste of power, as the runner stone has no momentum and continually throws its
dead weight upon the engine and other parts of the machinery, while the feeding of
the material into the mill requires constant regulation by the miller in order to
prevent a series of shocks to the machinery and to ensure at all uniform results in
grinding.
The position and action of the stones as usually arranged also cause great wear
and tear to all parts of the machinery and put unnecessary strains on the engine or
driving power.
The objects of our invention are the employment in a more effective manner than
heretofore of French "burr," and other stones which are found to be most suitable
for the purpose; to remedy the above mentioned defects; and to reduce the power
required for grinding.
For these purposes we employ a vertical bedstone concaved on its inner or
working face for a suitable depth, and a roller stone revolved vertically by a
horizontal shaft suitably driven, between which roller stone and the concavity of
the vertical bedstone the material under treatment is ground; such a vertical
concave bedstone is or may be fixed at either side of the roller stone.
We will fully describe our invention in reference to the accompanying drawings
in which two vertical concaved bedstones are illustrated, Figure 1 is a plan.
Figure 2 a longitudinal section thereof and Figure 3 a cross section on line 1-2 of
Figure 1.
Similar letters refer to similar parts in all of the figures.
A A are two vertical bedstones of any convenient dimensions with concavities a. a.
of suitable depth and running the full length of the inner faces of the stones A.
B is the roller stone extending the full length of the concavities of the bed stones
and of a corresponding diameter so as to fit into the same, it is mounted upon a
horizontal shaft S in suitable manner, for example upon a squared part as illus
trated, and it is carried in bearings p. p. upon a bedplate P and may be provided
with adjusting nuts s. s. as shown. R is the power pulley, F is an enclosing frame
or case of cast iron of suitable material which may with advantage be made in two
parts bolted together as shown and suitably fixed to the bedplate Pare end
plates for retaining the material, CC are set screws for adjusting the positions of
the bedstones A A upon their bed in regard to the roller stone B to compensate
for wear as required, and D. D. represent any required number of set screws for
steadying and regulating the position of the stones A.
To prevent undue strains at times when any unusually hard material has passed
into the mill we may apply suitable springs to one or both stones A. A so that they
will automatically retire and readjust their positions; such springs are illustrated
at e Figure 3, as enclosed in the casings c¹ and acted upon directly by the screws C
as will be readily understood.

page_text: His an aperture in the frame F for introduction of the feed between the
stones A. A. and above the roller stone B, by a shoot or other convenient means
adapted for regulation as required in accordance with the position and action of
the three stones, and the material so fed is ground between the periphery of the
roller B and the concavities of the stones A; the ground material then falls from
the stones and may be collected in a receptacle placed beneath the aperture P¹
formed in the bed plate P for the purpose.
The roller stone B being carried on a horizontal shaft can be constructed of much
lighter weight than the ordinary runner and it requires much less power to drive
it, and the dead weight and wear and tear above described are reduced to a
minimum.
Sudden shocks to the machinery and the necessity of constant attention on the
part of the miller are also obviated.
A machine so constructed is suitable for grinding either wet or dry materials.
Having now particularly described and ascertained the nature of this inven-
tion and the manner in which the same is to be performed we declaro that what
we claim is
1. In grinding mills the use of one or more vertical bedstones such as A each.
having a concavity a in its inner face and a roller stone B revolved by a horizontal
shaft between which roller stone and the concavity or concavities of the vertical
bedstone or bedstones the material under treatment is ground substantially as set
forth.
2. A grinding mill constructed and arranged substantially as hereinabove.
described and illustrated.