Year: 1887

page_text: Date of Application, 29th Apr., 1887
Complete Left, 30th Jan., 1888
Complete Accepted, 2nd Mar., 1888
We, WILLIAM FREDRICK GOREHAM, of Northumberland Villas, Wallsend, in the
County of Northumberland, Cement Works Manager, and MICHAEL WATSON, of
82 Rye Hill, in the City and County of Newcastle upon Tyne, Engineer, do hereby
declare the nature of said invention to be as follows:-
Our invention specially relates to mills for grinding cement but is applicable to
grinding other substances or materials.
"
Instead of stones we use circular dises of cast metal (which may be "chilled") or
of forged or rolled iron or steel and these discs we prefer to make in separate rings,
from the "eve or centre to the periphery, so that the greater wear of the outer
portion or portions of the face may be adjusted by means of screws or other appliances
but they may be made in one piece.
Instead of grooves in the faces of the discs, formed of the ordinary depth, we
propose to cast, or otherwise form, open slits through the thickness of each disc
terminating short of the peripheries; or cast or otherwise formed only partially
through the depth and across the faces thus, in either form, providing for the
necessary strength of the discs provision being also made if necessary to prevent
the material escaping, without being ground, through the open slits in the outer
circumference.
These open slits, cast or otherwise formed in each disc, we prefer to take a sloping
direction from, instead of being at right angles with the face so that the grinding
edge of each shall form preferably an acute angle..
Grinding discs so constructed will require no dressing but continue to work
efficiently until worn so far as to require renewal any loss in weight of the upper disc
being made up by loose weights.
001
1
C A 1 1007

page_text: COMPLETE SPECIFICATION.
Improvements in Grinding Machinery.
We, WILLIAM FREDRICK GOREHAM, of Northumberland Villas, Wallsend, in the
County of Northumberland, Cement Works Manager, and MICHAEL WATSON, of
82 Rye Hill, in the City ani County of-Newcastle-upon-Tyne, Engineer, 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 more particularly to mills for grinding cement but is
applicable to mills for grinding other substances or materials
Instead of using ordinary stones we employ a runner and a bed constructed with
discs or annular plates of cast metal (which may be chilled) or of forged or rolled
metal such as iron or steel. These discs or annular plates may be formed of separate
concentric rings, from the "eye" or centre thereof to the periphery, so that the
greater wear of the outer portion or portions of the face may be adjusted and com-
pensated for by means of screws or other suitable means but they may each be made
in one piece of metal.
Instead of forming the grooves or furrows constituting the "dressing" of the faces
of the runner and bed of the ordinary depth, we cast, or otherwise form, slots which
either extend through the thickness of each disc plate or ring but terminate short of
the periphery thereof; or cast or otherwise formed only partially through the depth
and across the faces, thus in either case providing for the necessary strength of the
discs. Means may be provided if necessary to prevent the material escaping, without
being ground, through the open slots in the outer circumference of the discs or plates.
We prefer to so cast or otherwise form the slots in each disc or plate that they take
a sloping direction from, instead of being at right angles with, the face thereof; so
that the grinding edge of each shall form preferably an acute angle.
Grinding discs or plates so constructed will require no further dressing but will
continue to work efficiently until so far worn as to require renewal, any loss in
weight of the upper disc or plate being made up when necessary by loose weights.
In the accompanying sheet of illustrative drawings
Fig. 1 is a vertical section of a runner and a bed constructed acccording to this
invention.
Fig. 2 is an underside face view of the runner and
Fig. 3 is a plan or top view thereof.
Figs. 45 and 6 are similar views to Figs. 1. 2. and 3 illustrating a modified
arrangement.
Figs. 7 and 8 are edge views of grinding dises or annular plates with differently
arranged slots or dressing.'
$6
Referring to Figs. 1. 2 and 3-the runner A and bedstone B are each in the form
of a perforated metal disc or annular plate built up of three concentric rings 1. 2.

page_text: and 3 of which the two outer ones 2 and 3 are each separately adjustable with
reference to each other and to the inner ring 1 for the purpose herein before stated by
means of set screws 4. 4* which take through flanges 5 formed on the inner rings.
66 are slots formed partially through the thickness of the ring I and extending across
the face thereof. 77 are slots formed through the thickness of the rings 2 and 3
but not through the peripheries thereof.
In Figs. 4, 5 and 6 a hollow metal runner and bed stone are shown each provided
with a removable annular grinding plato or perforated disc 9 secured in place by
screw threaded bolts 10. The dressing of each plate or discs 9 is formed of furrows
or slots 6. 6. which either extend partly through the thickness of the plate or disc and
across the face thereof as shown in figs. 5 and or entirely through the thickness but
not through the periphery thereof as shown in fig. 8.
Each furrow or slot (6 or 7) is so formed with reference to the face of the ring
disc or plate in which it is made that the angle of cutting the edgo 11 formed by one
side of the said furrow or slot and the said face is an acute angle.
As will be obvious, furrows or slots formed; according to this invention may be
varied in number and arrangement from those shown in order to form a dressing that
shall be suitable for grinding the particular kind of material to be operated upon.
The angle of each cutting odgo may also be varied to suit particular requirements.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be perfornied wo declare that what wo
claim is
1. In grinding machinery a runner, having adjustable metal rings substantially, as
hereinabove described.
2. In grinding machinery a bed having adjustable metal rings substantially as
hercinabove described.
3. Providing the adjustable metal, rings referred to in the preceding claims with a
dressing consisting of slots which extend through the thickness of each ring but not
through the periphery thereof or partially through the thickness and entirely across
the face of the ring substantially as herein described.
4. In grinding machinery providing the runner or the bed or both with a removable
metal grinding face plate or disc formed with a dressing consisting of slots which
extend through the thickness but not through the periphery thereof substantially as
hereinabove described and shewn.
5. In grinding machinery forming the slots constituting the dressing of the runner
or bed at such an angle with the face thereof that each grinding edge formed between
the face and one or both sides of a slot is an acute angle substantially as hereinabove
described.
6. In a grinding machine the combination and arrangement of parts shewn in and
described with reference to Figs. 1 to 3 inclusive of the drawings annexed.
7. In a grinding machine the combination and arrangement of parts shewn in
and described with reference to Figs. 4 to 6 inclusive of the drawings annexed.
8. A grinding machine with a runner and a bed one or each of which is provided
with a removeable metal grinding face plate or disc formed with a deep dressing
substantially such as described that will last without further dressing until the
removeable metal face plate or disc itself requires renewal.
Dated this 30th day of January 1888
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Agent for the Applicants."