CERTAIN IMPROVE- MENTS IN HYDRAULIC PRESSES
Year: 1876

page_text: LETTERS PATENT to Robert Wilson, of the Bridgwater Foundry, Patricroft, in
the County of Lancaster, Engineer, for the Invention of "CERTAIN IMPROVE-
MENTS IN HYDRAULIC PRESSES." Partly a communication from abroad by
Donald Nicolson, of Bombay, in the East Indies, Engineer.
Sealed the 7th November 1876, and dated the 23rd August 18
PROVISIONAL SPECIFICATION left by the said Robert Wilson at the Office
of the Commissioners of Patents on the 23rd August 1876.
ROBERT WILSON, of the Bridgwater Foundry, Patricroft, in the County of
Lancaster, Engineer. "CERTAIN IMPROVEMENTS IN HYDRAULIC PRESSES." Partly
a communication from abroad by Donald Nicolson, of Bombay, in the East Indies,
Engineer.
This Invention is particularly applicable to the finishing presses employed in
giving the final compression to bales of cotton or other fibres that have been par-
tially packed in a previous press.
The improved press consists of one or more rams of two different diameters fitting
into corresponding cylinders, which are either cast together or made in two parts.
The lower half of the 1am is smaller than the upper half. Each double ram works
in a cupped leather in the double cylinder, and when the cylinders are made in two
parts there is a third cupped leather at the joint.
The top and bottom plates of the press are bolted together longitudinally, and
the upper lashing plate is secured to the top, and the bottom lashing plate is secured
to the follower which is fixed to the upper ends of the rams.
When the press is at work the water from the force pumps is first admitted to
the smaller portions of the cylinders to raise the rams, and at the same time water
from a reservoir is admitted by gravity to the upper cylinders, and when the resist-
ance is too great to be overcome by the water under pressure acting on the small
ends of the rams it is admitted also to the larger portions of the cylinders from
which the water supplied by gravity is shut off, thereby giving the final compres-
sion by the combined action of both or all the rams.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Robert Wilson in the Great Seal Patent Office on the 22nd February
1877.
ROBERT WILSON, of the Bridgwater Foundry, Patricroft, in the County of
Lancaster, Engincer. "CERTAIN IMPROVEMENTS IN HYDRAULIC PRESSES." Partly
a communication from abroad by Donald Nicolson, of Bombay, in the East Indies,
Engineer.
This Invention is particularly applicable to the finishing presses employed in
giving the final compression to bales of cotton or other fibres that have been pre-
viously packed in an ordinary packing press
The improved press consists of one or more rams of two different diameters fitting
into corresponding cylinders which are either cast together or made in two parts
The lower half of the ram is smaller than the upper half. Each double ram
works in two cupped leathers in the double cylinder, and when the cylinders are
made in two parts there is a third cupped leather at the joint
The top and bottom plates of the press aro bolted together longitudinally, and
the upper lashing plate is secured to the top, and the bottom lashing plate is secured
to the follower, which is fixed to the upper ends of the rams.
And in order that this Invention may be fully understood and readily carried
into operation I will proceed to describe the accompanying Sheet of Drawings,
reference being had to the figures and letters marked thereon.
Fig 1 is an elevation, partly in section, of the improved hydraulic press, which is
particularly adapted for giving the final compression to bales that have been packed
in a previous press.
Fig. 2 is a transverse section of the same.
Fig 3 is a plan, partly in section, of the lower part of the press.
And Fig. 4 is a plan of the top of the press.
a, a, are two double 1ams, the upper portions of which are larger in diameter
than the lower portions The upper portion of cach ram fits in a cupped leather
in the cylinder b, and the lower parts fit in cupped leathers in the cylinders c, the
joint between the two parts of the cylinders is made tight by a cupped leather as
shewn at d, and both the upper and lower parts of the double rams work in the
cupped leathers above referred to of the ordinary description In some cases the
cylinders b and c may be cast together
The double cylinders are supported by the bottom plate e, which is or may be
made in two parts bolted together longitudinally, as described in the Specification
of former Letters Patent granted to me on the 22nd day of November 1869, Number
3364, and the bottom plate e is connected to the top f by the two columns g, g
The top may also be made in two parts, bolted together longitudinally. The
upper lashing plate his secured to the top, and the bottom lashing plate i is
secured to the follower j, which is fixed to the rams a; h, k, are the pipes for
admitting water under pressure to the cylinders c, c; and 1, l, are the pipes for
admitting the water to the upper portion of the cylinders.
The mode of operation is as follows.-When the bale has been placed on the
lashing plate i, the water from the force pumps is first admitted to the lower por-
tions of the cylinders c through the pipes k, to raise the rams a, a, and at the
same time water from a reservoir is admitted by gravity through a self-acting inlet
valve to the upper cylinders b, b, in the manner described in the Specification of
former Letters Patent granted to me on the 19th day of March 1862, Number 765,
and when the resistance becomes too great to be overcome by the water under pressure
thus supplied, the water from the force pumps is admitted also to the larger portions
of the cylinders b, thus stopping the supply from the reservoir by the superior
pressure of the water from the force pumps which closes the inlet valve, thereby
giving the final compression by the combined action of both the double 1ams.
Having thus stated the nature and particulars of this Invention, I wish it to be

page_text: understood that the details may be varied, and although the Drawing represents a
press provided with two compound rams and cylinders, a single ram and cylinder,
or more than two rams and cylinders may be used. I would also remark that the
hydraulic press above described may be used for various purposes, and that I do not
confine myself to the use thereof above particularly referred to, and I claim the im-
proved hydraulic press in which one or more rams of two different diameters fitting
into corresponding cylinders are used, and the mode of working the same as shewn
and described.
In witness whereof, I, the said Robert Wilson, have hereunto set my hand
and seal, this Twentieth day of February, One thousand eight hundred and
Seventy-seven
ROBERT WILSON. (L.S.)