Improved Means for Distributing Steam in Single Acting Steam Engines FOR DISTRIBUTING STEAM IN SINGLE ACTING STEAM ENGINES
Year: 1884

page_text: Improved Means for Distributing Steam in Single Acting
Steam Engines.
JAMES PARKER 20 Pendril Street Beverly Road Hull in the County of York,
Engineer do hereby declare the nature of my invention for IMPROVED MEANS FOR
DISTRIBUTING STEAM IN SINGLE ACTING STEAM ENGINES, to be as follows, and
consists in making them more simple in details by dispensing with the occentrics
slide valves, piston rods, stuffing boxes as well as the long steam ports at present.
used in this class of engines.
In describing my engine the steam cylinders are single acting one two or three
cylinders being used.
The steam is admitted on one side of the centro line of crank movement and
exhausts while the piston makes the return motion.
The piston has two lift valves, having spindles that project through the piston,
on each side of the connecting rod end where it is secured to the piston, these
valves are alternately lifted by snugs or projections on the end or side of the
connecting rods, so that one or other of these valves is open during the upward
movement of the piston, and the other on the downard motion, the piston having
a long port on each sido passing over ports in the side of the cylinder, to one of
which steam is supplied the other being used for the exhaust.
The small lift valves being worked by the movement of the snugs or projections
on the end of the connecting rods, are made equilibrium by having an enlarged part
fitting into properly bored holes in the body of the piston of slightly larger area
than the valve above, so that on steam being adinitted between the two the increased
area of the bottom part of the valve keeps the upper part on its face, and each valve
being thus fitted the engine is made reversing by admitting steam to either valve
at pleasure, by means of a fourway cock or D slide valve.
The steam port on the side of the cylinder I place in such a position that when
the piston has travelled say five eights of its stroke the body of the piston inter-
venes, and so cuts off further supply of steam, the remainder of the stroke being
completed by the expansion of the steam previously, admitted, and by putting a
slide over the steam admission port, moveable from the outside the steam may be
cut off at any point of the stroke at pleasure.
1004

page_text: Improved Means for Distributing Steam in Single Acting
Steam Engines.
JAMES PARKER 20 Pendril Street Beverly Road Hull Yorkshire Engineer do
hereby declare the nature of my invention for IMPROVED MEANS FOR DISTRIBUTING
STEAM IN SINGLE ACTING STEAM ENGINES and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement, and consist in making them more simple in the details by dispensing
with the eccentrics, valves, piston rods, stuffing boxes & as well as the long steain
ports at present used in this class of engine.
In describing my invention the steam cylinders are single acting, one, two, or
three cylinders being used.
The steam is admitted on one side of the centre line of crank movement or
downard stroke of the piston, the exhaust valve being open during the return or
upward stroke.
The pistons have two valves, having spindles that project through the body of
the piston, on each side of the connecting rod end where it is secured to the piston
these valves are alternately lifted by snugs or projections on the sides of the end of
the connecting rods, so that one or other of these valves are open during the upward
movement of the piston and the other on the downward motion, the piston having
long ports on the sides passing over other ports in the side of the cylinder, to one
of which ports steam is admitted, the other being used for the exhaust.
The small lift valves being worked or lifted by the movement of the projections
on the sides of the connecting rods, these valves can be made equalibrium by having
an enlarged part fitting into properly bored holes in the body of the piston of
slightly larger area than the valve above, and on steam being admitted between the
two, the increased area of the bottom part of the valve keeps the upper part on its
face, and each valve being thus fitted the engines are made reversing by admitting
steam to either valve at pleasure which can be done by means of a four way cock
or D slide valve.
The steam port on the side of the Cylinder I place in such a position that when
the piston has travelled say five eights of its stroke, the body of the piston inter-
venes and so cuts off further supply of steam the remainder of the stroke being
complete by the steam previously admitted.
I further employ a slide fixed on the side of the cylinder through which steam
is admitted, moveable from the outside, by this means steam can be cut off at any
part of the stroke at pleasure.
For more fully describing my Invention drawings have been annexed.
In Fig. No 1. a crank shaft of engine, b connecting rod having lugs 61 on the
piston end, these lugs alternately lift the valves c placed in the body of the piston d,
the port on the side of the cylinder shewn at e is for steam admission to the
passage fin piston above the valve c, the other port h is for the exhaust passage,
the steam is admitted into the cylinder from the passage f when the lug b¹ on
connecting rods lifts the valve c by a passage, passing from under this valve to the
upper side of the piston by the dotted opening shewn.

page_text: Fig. No 2, shews the arrangement of the valves c when the engines are intended
to reverse steam passage in body of piston f. c are the valves lifted by lugs on the
end of connecting rods 6' these valves have an enlarged part o' fitting into tho
body of the piston as shewn, and being of larger area than the upper valve o¹
keeps this valve on its seat, until lifted by the lugs on the end of the connecting
rod b¹ and as steam can be admitted to cither passage fat will by means of a
D slide valve or fourway cock, these engines are by this arrangement made
reversing. The steam port e is further (Fig. 1) opened more or loss by the valve j,
which moved by the spindle k, the position of this valve with reference to the
upper edge of the steam passage ƒ in piston regulates the cut off of the steam
during admission or movement of the piston downwards.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
First. The movement of lift valves in the body of the piston by projections on
the sides of the connecting rod ends, such valves being used for steam and
exhaust,
Second. The cutting off of the steam admitted to the cylinder by the movement
of the piston body over the steam port opening.
Third. The making of the said valves used for admission or exhaust, with an
enlarged part on which the steam pressure acts to ensure the valves being kept on
their faces, and to make the engines capable of being reversed.
Fourth. The opening or closing of the steam port on the side of the cylinder
relative to the travel of the piston, to cut steam off at any part of the stroke at
pleasure.