Improvements in Apparatus for Grinding, Orushing, Pulverizing, or Disintegrating.
Year: 1892

page_text: Date of Application, 13th Aug., 1892-Accepted, 17th Sept., 1992
COMPLETE SPECIFICATION.
Improvements in Apparatus for Grinding, Orushing, Pulverizing, or
Disintegrating.
I, JOHN UNWIN ASKHAM, of Yorkshire Steel and Engineering Works,
Sheffield, in the County of York, 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 :-
My improvements relate to grinding, crushing, pulverizing, or disintegrating,
apparatus of the roller centrifugal class in which balls, or rollers, are driven in the
interior of a cylinder, or ring, for the purpose of reducing various materials to
powder.
In order to prevent the arms, or drivers, from wearing away at their edges and
corners, or to enable them to be renewed when worn, I attach removeable pieces of
hard metal, by means of dovetails, plates, rivets, or bolts, or otherwise, to such edges
and corners, the arms, or drivers, being suitably shaped to receive them and in
order also to prevent the said arms, or drivers, wearing away where the roller pins
are guided, or to enable them to be removed when worn, I fix, preferably by
means of tapered cotters, removeable side pieces of steel for the roller pins to rub
against.
I also attach removeable pieces of metal to the ends of the stirrers, or propellers,
on the shaft such shaft being preferably made in several (say three) lengths the
end portions being attached to the central portion by couplings which may form
the bosses of the propellers, or stirrers, (or of some of them) or include the said
bosses (or some of them) between them. To facilitate removing the central
portion of the shaft for repairs and to enable the rings to be rotated without
removal I may make the said rings, forming the grinding paths, in halves, or parts,
by any suitable means, but preferably in one, or other, of the ways hereinafter
described and shewn in the drawings. For the purpose of obtaining easy access to
the interior of the apparatus, without removing the feed hopper, I divide the top
part of the feed ring into parts, (say two), or may place the hopper at one side
of the machine so that the upper part of the feed ring may be removed without
disturbing the feed hopper.
And in order that the said invention may be fully understood I shall now
proceed more particularly to describe the same and for that purpose shall refer
to the annexed drawings the same letters of reference indicating corresponding
parts in all the figures.
Figure 1 is an elevation, and Figure 2 is an end view, of the shaft of the
apparatus and its attachments.
Figure 3 is an enlarged side view of one of the drivers, or arms, and Figure 4 is
an edge view thereof partly in section.
Figures 5 and 6 are a side view and plan, partly in section, of one form of my
improved grinding path, or ring, in halves, and
Figures 7 and 8 are similar views shewing another arrangement of grinding path,
or ring, in halves.
Figure 9 is a cross section through the casing of the apparatus shewing the
removeable side and fixed hopper.
Figure 10 is a like cross section showing the arrangement of the hopper at the
side of the apparatus.
Referring to Figures 1 to 4 A is the central portion of the shaft of the apparatus
and B, B, are the outer portions the said portions being secured by couplings C
carrying stirrers D. E are the rollers or balls and F are the drivers or arms
thereof secured to the shaft. G G' are the renewable pieces upon the drivers or

page_text: arms and the stirrers respectively. H H are the renewable side pieces in the
drivers or arms for the axes of the rollers E to bear against. I are the tapered
cotters for securing them and J are the keep plates for retaining the parts securely
all of which are easily renewable.
In Figures 5 to 8, K is the roller ring or grinding path shewn in two parts. Lare
the keys and M is a tightening clip, or band, securing the parts together. Figure 5
is an elevation of the ring partly in section. Figure 6 is a sectional plan. In
Figures 7 and 8 the arrangement is similar to that of Figures 5 and 6 except that
the tightening clips M are formed by pieces M' whose ends are dovetailed and
enter recesses in the parts to be joined as described. S is a wrench for rotating
the interior grinding path by the bent in end engaging one of the recesses as
shown. Figure 7 is a part sectional elevation. Figure 8 is a part sectional
plan.
In Figure 9 N is the feed ring, O is the hopper and P the removeable piece.
In Figure 10, N is the feed ring; O, the hopper, and Q, is a moveable spout or
tube between feed hopper and feed ring. R R are brackets to carry the feed
hopper.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the sanie is to be performed I declare that what I
claim is :-
Firstly. Providing detachable wearing surfaces on the drivers, or arms, or on
the stirrers, (or on both), of machines of the kind hereinbefore described substan-
tially as hereinbefore described with reference to G G and H respectively.
Secondly. In machines of the kind described cylindrical grinding paths formed
in halves, or parts, in such a manner that they may be rotated without removal
substantially as herein before described.
Thirdly. The arrangements of feed hoppers for pulverizing machines of the kind
described to prevent the necessity of, removing such hoppers for repairing the
machine.
Fourthly. The general construction, combination and arrangement of parts
constituting a pulverizing machine substantially as herein described and illustrated
by the accompanying drawings.
Dated this 13th day of August 1902.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.