IMPROVEMENTS IN VALVES AND PISTON RODS FOR COMPOUND ENGINES
Year: 1879

page_text: LETTERS PATENT to George Kingdon, of Kingswar, near Dartmouth, in the
County of Devon, Engineer, for the Invention of "IMPROVEMENTS IN VALVES
AND PISTON RODS FOR COMPOUND ENGINES."
Scaled the 13th May 1879, and dated the 24th February 1879.
PROVISIONAL SPECIFICATION left by the said George Kingdon at the
Office of the Commissioners of Patents on the 24th February 1879.
GEORGE KINGDON, of Kingswar, near Dartmouth, in the County of Devon,
Engineer.
ir IMPROVEMENTS IN VALVES AND PISTON RODS FOR COMPOUND
ENGINES."
This Invention relates to improvements in valves and piston rods for compound
engines, the object being to arrange one slide valve in one steam chest, that the
steam from the high pressure cylinder may pass through said valve to the low
pressure cylinder at each travel, to be there reused before escaping to the condensor
or to the atmosphere.
The second object is to dispense with a stuffing box or gland in the partition
plate which divides the two cylinders of compound engines.
My valve is.formed with a wider or more open port at one end than at the other,
that it makes a connection with each exhaust port of the high pressure cylinder at
the termination of each stroke of the piston for the passage of the used steam
through the valve to the entry port of the larger or low pressure cylinder, the two
cylinders being attached or formed in one casting or otherwise.
The rod of the high pressure piston is formed with annular groves and projecting
rings, which rings fit the wall of the aperture in the partition plate between the
two cylinders, and form a steam tight joint at that part, whereby the usual stuffing
box at that part is dispensed with.
The Invention is applicable to all compound engines, marine, land, and locomotive.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Kingdon in the Great Seal Patent Office on the 22nd
August 1879.
GEORGE KINGDON, of Kingswar, near Dartmouth, in the County of Devon,
Engineer.
"IMPROVEMENTS IN VALVES AND PISTON RODS FOR COMPOUND
ENGINES."
This Invention relates to improvements in valves and piston rods for compound
engines, the object being arranging one slide valve in one steam chest, that the
steam from the high pressure cylinder may pass through said valve to the low
pressure cylinder at each travel, to be there reused before escaping to the condensor
or to the atmosphere.
The second object is to dispense with stuffing box or gland in the partition plate
which divides the two cylinders.
My valve is formed with a wider or more open port at one end than at the other,
that it makes a connection with each exhaust port of the high pressure cylinder at
the termination of each stroke of the pistons for the passage of the used steam
through the valve to the entry port of the larger or low pressure cylinder, the
cylinders being attached or formed in one casting or otherwise.
The rod of the high pressure piston is formed with annular grooves and projecting
rings, which rings fit the wall of the aperture in the partition plate between the
two cylinders, and form a steam tight joint at that part, whereby the usual stuffing
box at that part is dispensed with.
The Invention is applicable to all compound engines, marine, land, and locomotive.
My Invention is shown in the annexed Drawings, in which Figure 1 is a sectional
view of a compound engine of combined high and low pressure cylinders as one
structure, suitable for driving a screw propeller or any kind of machinery.
A is the improved valve, this having an extra large port or aperture B at one
end, to make a connection by its passage C with the exhaust port D of the high
pressure cylinder E, and of the entry port F of the low pressure cylinder G, that
the escaping steam from the high pressure cylinder may act upon the piston of the
low pressure cylinder as the live steam through the port H is opened to act upon
the corresponding surface of the piston in the high pressure cylinder, that the two
pistons I, J, move in the same direction, the two pistons being upon the same rod
K to actuate the crank shaft L through the, connecting rod M in the well known
manner.
Figure 2 is a plan view of the seating or face on which the valve slides to and
fro, the ports being shown.
Figure 3 is a sectional elevation of an equilibrium tubular valve arranged as
described for the friction valve shown in Figure 1, the ports D, F, H, of the
cylinders E, G, being also arranged in a similar manner.
The second part of my Invention is shown in Figure 1, where N is the ringed
and grooved portion of the piston rod K, which passes through the internal cover P
of the cylinder G, whereby the usual glands and packing are dispensed with, the
central portion Q having a raised shoulder that never less than three of the rings
bear against the inner wall in the to and fro movement of the rod K.
I have shown the internal cover as part of the casting of the two cylinders E and
G, it may however be a separate cover bolted in place between the two cylinders.
Having now described the nature of my said Invention, and in what manner the
same is to be performed, I declare that I claim,-
First. Providing the valves of compound engines with an end port of greater
width or more open than the other ports of said valve, that the exhaust steam from
the high pressure cylinder may pass to exert its remaining force upon the piston of
the low-pressure cylinder as set forth, said valve being like that shown in Figure 1,
or an equilibrium, as in Figure 3 of the annexed Drawings.

page_text: 5
Secondly. I claim forming that part of a piston rod which works through the
internal cover of a compound engine with grooves and rings as set forth and shown
in Figure 1 of the annexed Drawings, whereby the usual stuffing or packing box in
said cover is dispensed with as described.
Thirdly. I claim the compound engine shown in Figure 1 of the annexed
Drawings, especially the valve with a wide port, and the ringed and grooved piston
rod as part thereof, the whole acting as and for the purposes set forth.
In witness whereof, I, the said George Kingdon, have hereunto set my hand
and seal, this Eighteenth day of August, in the year of our Lord One
thousand eight hundred and seventy nine.
GEORGE KINGDON. (L.S.)
Witness,
THOB. LEVETT PRINCE.