Improvements in or relating to Mills or Apparatus for Grinding and Polishing.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Mills or Apparatus for Grinding and
Polishing.
I, WILLIAM OLIVER BAILEY, of The Excelsior Works, Wenlock Road, City
Road, London, E.C., Glass Merchant, Silverer and Beveller. do hereby declare the
nature of my said invention to be as follows:-
My invention relates to that class or description of mills or grinding machines
which are used with a grinding or polishing medium (such as sand, emery, rouge
and the like in solution), such mills or apparatus being generally formed of a
grinding ring mounted by suitable means on an axle so as to revolve therewith.
The method of feeding the medium to the mill face has hitherto been accom-
plished by external application, i.e. from outside the circumference of the mill;
such a method is unsatisfactory as the rotating ring does not take up or induce
a supply of medium between the surface under treatment and the ring, the edge
of the ring heaping the medium up around its periphery. It has been proposed
to mount the rings eccentrically to overcome this defect, but the result was not.
satisfactory.
The object of my invention is to remedy such defects by providing an improved
construction or formation of the grinding ring to be used in combination with
means for feeding the grinding or polishing medium internally.
According to my invention I form the ring with a corrugated ratchet shaped,
or other irregularly shaped internal edge, such corrugations or the like extend-
ing a suitable distance into the grinding face of the ring. The irregular edge
takes up the medium effectually and also serves to distribute the medium equally
in between the grinding face and the surface to be ground, the centrifugal
forces causing the medium to gradually travel to the outer edge or periphery of
the ring.
When the mill is to revolve horizontally the medium is fed through the axle
which is formed hollow for the purpose; the medium may fall direct on to the
surface to be ground or on to a disc suspended above the surface within the
grinding ring in such a manner that the medium is caused to travel thereon by
centrifugal forces until it drops off the edge of the disc in close proximity to the
irregular edge of the ring.
When the mill is to revolve vertically the medium is fed on to a disc arranged
to fit the irregular edge but which is situated slightly below the level of the
grinding face of the ring; this may be accomplished by a worm and brushes in
combination with a mixing hopper, the centrifugal forces causing the medium to
travel from the disc to and over the grinding surface in a perfectly even layer.
Dated 24th November 1899

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Mills or Apparatus for Grinding and
Polishing.
.
WILLIAM OLIVER BAILEY, of The Excelsior Works, Wenlock Road, City
Road, London, E.C., Glass Merchant, Silverer and Beveller. do hereby declare the
nature of my said invention and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:-
'
.
My invention relates to that class or description of mills or grinding machines
which are used with a grinding or polishing medium (such as sand, emery, rouge
and the like in solution), such mills or apparatus being generally formed of a
grinding ring mounted by suitable means on an axle so as to revolve therewith.
The method of feeding the medium to the mill face has hitherto been accom-
plished by external application, i.e. from outside the circumference of the mill;
such a method is unsatisfactory as the rotating ring does not take up or induce
a satisfactory supply of medium between the surface under treatment and the
ring, the edge of the ring heaping the medium up around its periphery. It
has been proposed to mount the rings eccentrically to overcome this defect, but
the result was not satisfactory.
The object of my invention is to remedy such defects by providing an improved
construction or formation of the grinding ring to be used in combination with
means for feeding the grinding or polishing medium, internally.
According to my invention, I form the ring with a corrugated, ratchet shaped,
or other irregularly shaped internal edge, such corrugations or the like extend-
ing a suitable distance into the grinding face of the ring." The irregular edge
takes up the medium effectually and also serves to distribute the medium equally
in between the grinding face and the surface to the ground, the centrifugal
forces causing the medium to gradually travel to the outer edge or periphery of
the ring.
When the mill is to revolve horizontally the medium is fed through the axle
which is formed hollow for the purpose; the medium may fall direct on to the
surface to be ground or on to a disc suspended above the surface within the
grinding ring in such a manner that the medium is caused to travel thereon, by
centrifugal forces, until it drops off the edge of the disc in close proximity to the
irregular edge of the ring.
When the mill is to revolve vertically the medium is fed on to a disc arranged
to fit the irregular edge but which is situated slightly below the level of the
grinding face of the ring; this may be accomplished by a worm and brushes in
combination with a mixing hopper, the centrifugal forces causing the medium to
travel from the disc to and over the grinding surface in a perfectly even layer.
And in order that my said invention may be particularly described and ascer-
tained reference is hereby made to the accompanying drawings in which similar
letters of reference indicate corresponding parts.
Figs. 1 to 6 represent a few examples of grinding rings formed in accordance
with my invention.
Fig. 7 is a section of a vertical mill and Fig 8 is a section of a horizontal
mill which illustrate my means for feeding the mill interiorly.
I form the ring with an irregularly shaped inner edge or side so as to catch
up and induce the flow of the medium across its face and produce a cutting or
grinding somewhat analogous to a shearing action.
In Fig. 1 the inner edge or side of the ring is corrugated; in Fig. 2 it is
shown ratchet shaped, the sharp corners being in some cases rounded off as indi-

page_text: cated by the dotted lines; in Fig. 3 it is elliptical; in Fig. 4 it is formed by
four segments of circles, or by two ellipses at right angles to each other; in
Fig. it is formed by segments arranged eccentrically to form a long ratchet.
In the latter case it may be desirable to incline the surface at y so that the
edge is slightly below the level of the ring, as shown in Fig. 6 which is an
enlarged perspective view of a portion of Fig. 5. Any other irregular but
balanced shape, such as flat sided figures, or a combination of these with curved
figures, may be used with slightly varying success
All the mills constructed or formed in accordance with this invention are
intended to be fed from within the ring; and in order to accomplish this in a
satisfactory manner I provide the mill a with a metal or other disc f which is
arranged to fit the recess formed by the grinding ring b, as shown in Figs. 7
and S and described in my former Letters Patent No. 16995 of 1899.
The disc, which may be flat or dished, is adjustably supported by bolts and
springs for by any other suitable means whereby the level of the disc may be
adjusted to a convenient and suitable position for working. In Fig. 7, which
illustrates a vertical mill, the disc is shown slightly below the level of the
ring b, and in Fig. 8 the dise is of a smaller diameter than the internal diameter
of the ring and is shown above the level of the grinding surface. In the latter
figure the medium in solution is preferably fed through the hollow spindle or
shaft a whence it falls on to the disc f upon which it travels or creeps by cen-
trifugal action to the edge where it falls or is thrown off close to the inner edge of
the grinding ring b.
For vertical mills the medium is fed on to the disc by means such as described
and claimed in my said former Letters Patent No. 16995 of 1899, or otherwise
in such a manner that the medium in solution is fed on to the disc from whence
it travels by centrifugal action over and across the face of the mill assisted by
the irregular formation of the inner edge.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. In mills for grinding and polishing of the description aforesaid, the appli-
cation and use of a grinding ring formed with an irregularly shaped inner edge
or side, substantially as and for the purpose set forth.
2. In mills of the description aforesaid the application and use of a grinding
ring the inner edge or side of which is ratchet shaped, the step or tooth of which
is slightly cut away or inclined so that its edge is slightly below the level of the
grinding ring, substantially as and for purpose specified and, illustrated by
Fig. 6 of the drawings.
3. The several and respective constructions or particular formations of grinding
rings, substantially as described with reference to Figs. 1 to 5 of the drawings.
4. The combination with a grinding ring formed with an irregular inner edge
as described of a disc fitting the recess and adjustably supported therein, arranged
and operating substantially as and for the purpose described and illustrated by
Figs 7 and 8 of the drawings.