IMPROVE- MENTS IN STEAM ENGINES
Year: 1879

page_text: LETTERS PATENT to George Saxon, of Spring Works, Openshaw, near Man-
chester, in the County of Lancaster, Engineer, for the Invention of "IMPROVE-
MENTS IN STEAM ENGINES."
Sealed the 9th May 1879, and dated the 5th February 1879.
PROVISIONAL SPECIFICATION left by the said George Saxon at the Office
of the Commissioners of Patents on the 5th February 1879.
GEORGE SAXON, of Spring Works, Openshaw, near Manchester, in the County of
Lancaster, Engineer. "IMPROVEMENTS IN STEAM ENGINES."
This Invention consists in attaching a block between the main slide and the cut
off valves, which has ports on each side to suit the motions of the main slide and
cut off valves respectively.
A port block is placed upon or against the back of the main slide valve, so
arranged that it shall have neither longitudinal nor tranverse motion, and yet sit
or press freely upon the main valve, and having the ports or passages on the side
next the main valve to suit its motion, and the ports or passages on the side next
the cut off valves or plates to suit their motion, which requires to be much less than
that of the main valve.
By this means the regulator or governor will have sufficient action to open or
close the valves, so as to cut off the steam at any required part of the stroke to suit
the pressure of the steam and the load upon the engine respectively.
The cut off valves or plates are placed upon or against the back of the block on
that side which is farthest from the main valve, and have a longitudinal motion
given to them by eccentrics or any other suitable means.

page_text: -SPECIFICATION-in-pursuance-of-the-conditions of the Letters Patent filed by
the said George Saxon in the Great Seal Patent Office on the 5th August
1879.
GEORGE SAXON, of Spring Works, Openshaw, near Manchester, in the County of
Lancaster, Engineer. "IMPROVEMENTS IN STEAM ENGINES."
My Invention consists in placing a block between the main slide and the cut off
valves, which block has ports on each side to suit the motions of the main slide
and cut off valves respectively.
A port block is placed upon or against the back of the main slide valve, so
arranged that it shall have neither longitudinal nor transverse motion, and yet sit
or press freely upon the main valve, and having the ports or passages on the side
next the main valve to suit its motion, and the ports or passages on the side next
the cut off valves or plates to suit their motion, which requires to be much less
than that of the main valve.
.
By this means the regulator or governor will have sufficient action to open or
close the valves so as to cut off the steam at any required part of the stroke to suit
the pressure of the steam and the load upon the engine respectively.
The cut off valves or plates are placed-upon or against the back of the block on
that side which is farthest from the main valve, and have a longitudinal motion
given to them by eccentric or any other suitable means.
And in order that my Invention may be understood and readily carried into
effect, I will describe the accompanying Drawing.
Fig. 1 is a longitudinal section of a steam cylinder with double valves, to which
my improvements are applied. a is the cylinder; b, b, the ports; and c, the main
valve which are made as usual; d, d, are the blocks with ports d', which ports have
three branches on the upper face to allow a large quantity of steam to be admitted
with a slight movement of the cut off valve; these blocks rest on the main valves,
and are retained in position by slots in the sides of the steam chest; e, e, are the
cut off valves connected to the valve spindle by right and left handed screws or
by other means. The valve spindle is turned by the governor to increase or reduce
the distance between the cut off valves, thereby regulating the admission of steam
to the cylinder. The Drawing represents the valves in the position they occupy
when the steam is cut off. The ports of the cylinder and the block are in a line
with each other, so that when the port of the main valve comes in line with the
port of the cylinder it is ready for the admission of steam.
·
Fig. 2 is a plan of the top, and Fig. 3, a plan of the under side of the cut off
valve.
Fig. 4, a plan of the top, and Fig. 5, a plan of the under side of the block.
Fig. 6, a plan of the top, and Fig. 7, a plan of the under side of the main
slide valve c.
Fig. 8 is a longitudinal section of a cylinder with a single valve, to which my
improvements are applied. a is the cylinder; b, the ports; c, the main slide valve;
d, the port block which rests in a slot at either end of the steam chest, and beárs
by its own gravity on the main slide valve; e, e, are the cut off valves regulated
by the governor, which turns the spindle and moves the valves by the right and left
handed screws, or by other means along the face of the port block. These valves
act in the manner above described.
By placing the block between the main valve and cut off valve, I have always a
stationary port for the latter to work on, thus enabling the cut off to be adjusted
with great accuracy, and to admit and cut off the steam more rapidly than by any
valves of the ordinary construction.
.

page_text: Having thus stated the nature of my Invention and described how the same is
to be performed, I declare that I claim the block placed between the main slide
valve and the cut off valve, substantially as described.
In witness whereof, I, the said George Saxon, have hereunto set my hand
and seal, this Second day of August, One thousand eight hundred and
seventy nine.
GEORGE SAXON. (L.S.)