Improvements in Triple Expansion Compound Steam Engines.
Year: 1896

page_text: Date of Application, 6th Nov., 1896
Complete Specification Loft 10th lune 1907
Accented
24th July 1007
PROVISIONAL SPECIFICATION.
Improvements in Triple Expansion Compound Steam Engines.
I, THOMAS GETHING CLAYTON of the Grange, Normanton in the County of
Derbyshire, Engineer-do hereby declare the nature of this invention to be as
follows:-
My invention relates to improvements in the construction and arrangement of
steam engine cylinders, pistons and slide-valves, whereby the steam is used three
times in succession in two cylinders, and I propose to effect this object in the
manner described below.
The slide-valve is formed with steam-passages through it so arranged that the
steam is first admitted into a space upon the upper side of a piston, the effective area
of which is diminished by a projecting part or plunger extending upwards and
working in a casing or sleeve above the cylinder; the steam thus forces the piston
down, and the valve having then been moved to its second position by means of
an eccentric or crank upon the fly-wheel shaft, the steam next passes through a
second passage which conducts it from the diminished area or upper side of the
piston to the underside, the effective area of which is about two and a-half times
that of the upper side, and there the steam forces the piston up again to its first
position. By this time the valve has been again moved so as to bring its second
passage into such a position as to re-conduct the steam from the underside of the
piston in the first cylinder to the upper side of the piston in the second cylinder,
the diameter or effective area of this second piston being again about two and
e-half times that of the lower side of the first piston; and the two pistons being
connected torether by a rod passing through a steam-tight packing in the plate
or cover between the two cylinders. By the time the second or larger piston has
completed its downstroke, the slide-valve has been moved so as to bring a third
passage formed in it into such a position as will allow the steam to escape from the
second or larger cylinder into the atmosphere.
Dated this fith dar of November 1806
GEDGE & FEENY,
60 Queen Victoria Street, London, E.C., Chartered Patent Agents.
For the Applicant
COMPLETE SPECIFICATION.
Improvements in Triple Expansion Compound Steam Engines.
I, THOMAS GETHING CLAYTON of the Grange, Normanton in the County of
Derbyshire, Engineer, 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:-
My invention relates to improvements in the construction and arrangement of
I, THOMAS GETHING CLAYTON of the Grange, Normanton in the County of
Derbyshire, Engineer, 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:-
My invention relates to improvements in the construction and arrangement of

page_text: Steam-engine cylinders, pistons and slide valves, whereby the steam is used three
times in succession in two cylinders, and I effect this object in the manner described
below.
The slide valve is formed with steam passages through it so arranged that the
steam is first admitted into a space upon the upper side of a piston, the effective area
of which is diminished by a projecting part or plunger extending upwards and
working in a casing or sleeve above the cylinder; the steam thus forces the piston
down, and the valve having been then moved to its second position by means of
an eccentric or crank upon the fly-wheel shaft, the steam next passes through a
second passage which conducts it from the diminished area or upper side of the
piston to, the underside, the effective area of which is about two and a-half times
that of the upper side, and there the steam forces the piston up again to its first
position. By this time the valve has been again moved so as to bring its second
passage into such a position as to re-conduct the steam from the underside of the
piston in the first cylinder to the upper side of the piston in the second cylinder,
the diameter or effective area of the second piston being again about two and
a-half times that of the lower side of the first piston: and the two pistons being
connected together by a rod passing through a steam-tight packing in the plate
or cover between the two cylinders. By the time the second or larger piston has
completed its downstroke the slide valve has been moved so as to bring
passage formed in it into such a position as will allow the steam to escape from the
second or larger cylinder into the atmosphere.
My invention will be better understood by reference to the accompanying draw-
ing which shows a vertical section of the cylinder having two diameters and of
the pistons with diameters corresponding therewith, and also of the slide valve.
On the drawing-A is the steam supply pipe leading from the boiler, the steam
from which goes through passage 1 in the valve and steam-port B, into the first
cylinder C-being the one of smaller diameter-and forces the piston F down,
the steam following the piston until the slide valve D operated by the eccentric
on the crank-shaft, shuts off further supply of the high pressure steam; before the
piston F, however, has completed, its downstroke, the slide valve D has been moved.
onward to such a position as to bring its passage 2 opposite to the steam-port B,
causing the steam to rush from the top of the piston 1, through passage 2 in the
slide valve and steam-port E to the underside of the piston F which is about two
and-a-half times the area of the upper or high pressure side. This steam forces
the piston F upwards, but before it reaches the top end of its return stroke, the
slide valve D has been so far moved back as to bring its passage 2 over steam-
ports E and G. The steam then passes from the first cylinder C into the second or
larger cylinder C, and forces the piston H downwards, this piston H being again
about two and-a-half times as large in effective area as the underside of piston F.
Before piston H has reached the bottom end of its stroke, the slide valve D has
again been moved so as to bring its passage 3 over steam-nort G, thus allowing the
stentn after it has performed its treble duty to escape through the exhaust passage
and pipe J.
When the slide valve D is in the position at which the steam is passing from
the first cylinder C to the second or larger cylinder C-through steam-port E,
valve passage 2 and port G,-high pressure steam from the boiler is again passing
through passage 1 and steam-port B into the first cylinder C, so that high pressure
steam is acting upon piston at the same time and in the same direction as the
a-lower pressure steam is exerting downward pressure upon the piston H.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:
1. In triple-expansion steam-engines, the combination of two cylinders C, C',
of different diameters and capacities, and of pistons F, H, of special construction
arranged therein and connected together, with the particular arrangement of

page_text: steam-ports and passages A, B, E, G and J, the whole operating and working
together for the purposes and substantially as described herein and as shewn on
accompanying drawing.
2. In triple-expansion steam-engines, the particular form and construction of
slide valve D having passages 1, 2, 3, arranged therein for the purpose and
substantially as herein described and as shewn on accompanying drawing.
3. The combination of two cylinders of different diameters and capacities C, C¹
pistons F, H arranged therein and connected together, and specially arranged
steam-ports and passages A, B, E, G and J with the particular form and construc-
tion of slide valve 1) provided with passages 1, 2, 3 for the purposes and substantially
as described with reference to accompanying drawing.
1007
GEDGE & FEENY,
60 Queen Victoria Street, London, E.C., Chartered Patent Agents.
For the Applicant.