Improvements in and relating to Crushing Mills.
Year: 1889

page_text: Date of Application, 31st Oct., 1889
Complete Specification Left, 23rd July, 1890-Accepted, 23rd Aug., 1890
PROVISIONAL SPECIFICATION.
Improvements in and relating to Crushing Mills.
We, JAMES NOAH PAXMAN, and WILLIAM PAXMAN, Engineers, both of the Standard
Iron Works, Colchester, in the County of Essex, do hereby declare the nature of this
invention to be as follows:-
Our invention relates to improvements in "Huntington's" centrifugal roller mill as
set forth in his Patent No. 10595 of 1885, and consists of certain improvements in the
roller head and pan.
It has been found in practice that the quartz or rock being crushed works under
the heads of the rollers causing the bolts fixing the loose plate in the roller head
to work loose the consequence of which is that the grit works into the interior of
the roller head and so into the bearing of the roller destroying the wearing
surfaces and materially shortening the life of the rollers. It also has been found
that there is considerable wear on those parts of the pan not protected by the
steel dies. It is the object of our invention to overcome these defects which we
do in the following manner;
We make the roller head solid, but form the bearing sleeve in a separate piece
adapted to be fixed to the solid head by means of suitable bolts passing through holes
in a flange on the sleeve and having T shaped heads or their equivalents adapting
them to engage with suitable holes or slots formed in the solid head. At the junction
of the sleeve and solid head is formed a chamber to receive a collar or enlargement on
the driving shaft to support the roller. Between the frictional surfaces of the sleeve
and the collar or enlargement of the shaft one or more steel washers are interposed.
A suitable recess is formed in the solid head of the roller to receive the end of the
shaft and to provide a receptacle for the lubricating oil. The pan which is made of
cast iron has a lining of steel plate above the die, the said plate having suitable screen
openings. We sometimes also line the inwardly projecting flange of the pan, or form.
such a flange on the lining a short distance above the screen openings. The bottom
of the pan is also lined with suitable steel plates.
Dated this 21st love of On
1000
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
Royal Courts Chambers, 70-72, Chancery Lane, London, W.C.,
Agent for the Applicants.
COMPLETE SPECIFICATION.
Improvements in and relating to Crushing Mills.
We, JAMES NOAH PAXMAN, and WILLIAM PAXMAN, both of the Standard Iron
Works, Colchester, in the County of Essex, Engineers, 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 to improvements in Huntington's centrifugal roller mill
described and shown in his Patent No. 10595 of 1885, and consists of certain improve-
ments in the roller head and pan, the objects being to prevent grit and dirt obtaining
access to the roller shafts, to prevent the escape of oil therefrom, to make the roller
head more rigid and secure, and to prevent undue wear on the pan.
We attain these objects in the manner illustrated in the accompanying drawing:
in which ;-
"
Figure 1. is a vertical section of the pan and crushing rollers of a "Huntington'
crushing mill embodying our improvements, and Figures 2. and 3. are plans of the
roller head showing the method of connecting them to their sleeves.

page_text: The
Throughout the several views similar parts are marked with like letters of reference.
The circular pan A has a ring die B fixed around its interior near to the bottom,
and it is fitted with an upper part A having suitable openings a for the admission of
the quartz etc. to be crushed and suitable discharge openings and screens a¹. The
centre of the pan A is shaped to adapt it to form a bearing A2 for a vertical shaft C
which is driven by any suitable form of gearing. This shaft Ccarries a disc D having
suitable bearings d. d. adapted to receive the trunnions e. e. of sleeves E E
carrying vertical shafts F F adapted to receive the crushing rollers.
trunnions e. e. are so arranged as to allow the vertical shafts carrying the rollers
to oscillate or swing inwards and outwards as the disc is driven around by the
central driving shaft, and the disc D is provided with suitable openings to allow
of the free movement of the sleeves carrying the said shafts. The disc D also
carries two or more scrapers of the type described and illustrated in Huntington's
Patent as aforesaid. The pan A is supported on any suitable frame or stand A³.
So far the crushing mill is constructed in accordance with Huntington's Patent as
aforesaid, and we will now proceed to describe our improvements. The interior of
the upper part A of the pan is fitted with a steel lining G to prevent excessive
wear on the pan itself. We sometimes also line the inwardly projecting flange A
with a steel plate G' for the same purpose, or form such a flange on the lining G,
providing suitable openings for the screens.
The roller head H is made solid-or practically so-that is to say, it has a solid
bottom, and the bearing sleeve J is made in a separate piece to enable the roller head H
to be mounted on the vertical shaft F which has a collar or enlargement fadapted
to support the said roller head. At the junction of the sleeve J with the roller head
is formed a recess h to receive the collar or enlargement f on the shaft F, one or more
suitable steel washers f¹ being interposed between the wearing surfaces of the collar
or enlargement and the sleeve J as illustrated, and a suitable recess is formed in the
roller head H to receive an extension of the shaft F. The sleeve J is fixed to the
roller head H by means of bolts K. K. etc. or their equivalents, engaging with
the roller head Has illustrated by the left-hand roller in Figure 1. of the drawing, or
with a flange formed thereon as illustrated by the right-hand roller in Figure 1. of
the drawing and passing through suitable holes in the flange j on the sleeve J. In the
former case the bolts take the form of studs confined in the roller head H by means of
nuts k. k. etc. passed into the solid head by means of the slots h³ ³ etc. cut or formed
in the side thereof. The flange j of the sleeve is provided with holes to receive the
ends of the bolts K. K. etc. and is fixed to the roller head H by means of the nuts and
lock nuts etc. threaded on to the bolts K. K. etc. In the latter case the
bolts K. K. etc. engage with a flange on the roller head by means of the
slots h. etc. cut or formed therein. The roller head H is fixed with an exterior
circular shoe H¹ as illustrated and set forth in Huntington's prior Patent as
aforesaid. By constructing the roller head in the manner set forth we overcome
the defect that has been found in practice to exist in the construction set forth in
Huntington's prior Patent as aforesaid, viz. ;-the quartz or rock working under the
heads of the rollers and causing the fixing bolts and the plate forming the joint to
work loose, thereby admitting the grit and dirt into the chamber in the roller head,
which rapidly destroys the bearing surfaces of the sleeve and shaft, and allows the
oil to escape into the pan and mix with the amalgam.
We wish it to be understood that we do not limit ourselves to the precise
details of construction hereinbefore set forth, but hold ourselves at liberty to make.
such changes and alterations as fairly fall within the spirit and scope of our
invention.
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
1st. The improvements in crushing mills having rollers turning loosely on vertical
shafts, suspended from a disc driven by a central shaft, so that they are free to

page_text: oscillate or swing inwards and outwards as pendulums and be caused to travel
round in contact with the sides of the pan by centrifugal action, as and for the
purpose set forth.
2nd. In a crushing or grinding mill having rollers turning loosely on the lower
ends of vertical shafts suspended from a disc driven by a central shaft so that they
may oscillate or swing inwards and outwards and be caused to travel round in contact
with the sides of the pan or die by centrifugal action, the improved means of mounting
the rollers on their shafts whereby a solid bottom is obtained for the roller bead,
as set forth.
3rd. In a crushing or grinding mill having rollers suspended from a driving
disc so that they are free to oscillate or swing inwards and outwards and travel
round in contact with the sides of the pan or die by centrifugal action, lining
the interior of the pan above the die in the manner and for the purpose set forth.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
Royal Courts Chambers, 70-72. Chancery Lane, London, W.C.,
Agent for the Applicants.