IMPROVEMENTS IN SAFETY HYDRAULIC BEARINGS FOR SUGAR-CANE MILLS
Year: 1884

page_text: J, DUNCAN STEWART, of the London Road Iron Works, Glasgow, in the County
of Lanark, North Britain, Engineer, do hereby declare the nature of my said
invention for "IMPROVEMENTS IN SAFETY HYDRAULIC BEARINGS FOR SUGAR-CANE
MILLS" and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
My said Invention relates to sugar-cane mills of the kind described in the
specification of my Patent N° 3583 of 1881 and comprises improvements in the
details of the hydrau ic cylinders by means of which pressure is applied to the
bearings, and through the bearings to the rolls, such pressure being limited to a
suitable amount, and the rams of the cylinders yielding whenever from an excess
of canes being passed through the rolls or other cause, there occurs a tendency to
greater pressure, such yielding saving the machine from breakage.
It is imptant for the proper working of the mill that the packings of the
hydraulic rams should be maintained in good order, and that they should be
capable of being examined and adjusted or renewed without loss of time whenever
it may seem desirable; and by my present Invention this object is attained by
fitting covers upon the outer en is of the cylinders. Such covers can be removed
with facility at any time, instead of its being necessary as heretofore to separate
each entire cylinder from the machine. The arrangement also admits of a stop
being formed within the cylinder to limit the extent of movement of the ram.
On a sheet of explanatory drawings which is hereunto appended two slightly
varied modifications are delineated, figure, 1, being a sectional elevation, and
figure, 2, a vertical section, and the same reference numerals being used to mark the
same or like parts wherever they are repeated.
In the modification shown in figure, 1, the hydraulic cylinder, 3, is fixed to the
framing of the sugar-cane mill by long bolts, 4, and its ram, 5, bears against an
iron or steel plate, 6, held against the outer vertical side of the brass bearing, 7,
which can slide on a horizontal bed or guide, 8, and carries the roll journal or
gudgeon, 9. The cylinder, 3, is fitted with a cover, 10, which is bolted on its
outer end by bolts, 11, (these bolts being, in this modification, separate from and
smaller than the main bolts 4) The joint of the cover, 10, is in this modification
made tight with a ring, 12, of gutta percha or other suitable compressible material

page_text: held in a check or annular rebate formed in the cover and fitting upon the
projecting edge of a brass lining, 13, with which the cylinder is provided.
The packing between the ram, 5, and cylinder, 3, consists of a cup leather, 14,
fixed to the inner end of the ram, and consisting, by preference, of a complete disk
having a flange formed on its edge as shown. The leather disk is fixed by an iron
disk, 15, secured to the ram, 5, by a bolt, 16, the flanged or cupped part being
held in its proper position by a rubber ring, 17, fixed by means of a junk ring to
the disk, 15. The pipe, 18, for supplying water or other liquid under pressure to
the cylinder, 3, is shown as connected to the cover, 10; but it may be connected
to the cylinder if preferred. The ram, 5, is made with a shoulder, 19, and the
interior of the cylinder, 3, is correspondingly shaped for the purpose of limiting
the movement of the ram and of preventing it from pressing the bearing, 7, too
far inwards.
In the modification shown in figure, 2, the hydraulic cylinder, 3, and its cover, 10,
are shaped so that the main bolts, 4, pass through both, and their nuts, 20, have
to be unscrewed to get off the cover, 10, The joint between. the cover, 10, and
cylinder, 3, is made tight by means of a flanged or cupped leather disk, 21, which
is held by an iron disk, 22, bolted to the cover by a tubular bolt, 23, through
which the water or liquid under pressure enters the cylinder, 3. In other respects
the arrangement is the same as that shown in figure, 1, and herein before described.
Having thus particularly described my said Invention and in what manner the
same is to be performed I proceed to ascertain the distinctive features of novelty
thereof by declaring that what I claim is :-
1. The constructing of hydraulic cylinders for safety bearings of sugar-cane
mills with covers on their outer ends substantially as and for the purpose herein-
before described.
2. The forming of the ram with a shoulder and shaping the interior of the
cylinder to correspond there with substantially as and for the purpose herein-
before described.
Dated this third day of Manch 1001