Improvements in Valves for Steam Engines and Means for Adjusting same.
Year: 1898

page_text: Date of Application, 9th May, 1898
Complete Specification Left, 9th Feb., 1899-Accepted, 11th Mar., 1899
PROVISIONAL SPECIFICATION.
Improvements in Valves for Steam Engines and Means for Adjusting
same.
I, ADAM DOBSON, of 58, Clifton Park Avenue, in the City of Belfast and County
of Antrim, in Ireland, Engineer, do hereby declare the nature of this invention
to be as follows:-
My invention relates to the construction and arrangement of the steam valves
of an engine and the regulation and control thereof, and it consists in the use of
two circular valves one being within the other revolving in opposite directions
and each provided with two or more openings or ports through which the steam
will pass as one of such openings or ports in each valve arrives opposite the steam
port of the cylinder, by which arrangement I obtain a slow revolving valve in a
high speed engine.
I arrange the openings or ports of the two valves to arrive opposite each other
at stated intervals by means of suitable gearing leading from the crank shaft.
The inner or cut off valve I actuate by the governor of the engine by means
of adjustable rachets and worms and worm wheels connected with them.
Dated this 7th day of May 1898.
HUGH
HYNDMAN,
6, Chichester Street, Belfast,
Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Valves for Steam Engines and Means for Adjusting
same.
I, ADAM DOBSON, of 58, Clifton Park Avenue, in the City of Belfast and County
of Antrim, in Ireland, 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 the construction and arrangement of the steam valves
of an engine and to the regulation and control thereof, and it consists in the use
of two circular or tubular valves, namely a steam valve and a cut off valve, one
being placed within the other, revolving in opposite directions, and each provided
with two or more openings or ports through which steam will pass as one of such
openings or ports in each of such valves arrives opposite to the steam port of the
cylinder, by which arrangement I obtain a slow revolving valve in a high speed
engine.

page_text: I arrange the openings or ports of the two valves so as to arrive opposite each
other at stated intervals by means of suitable gearing leading from the crank shaft
and driving the valves.
The inner or cut off valve is actuated or altered in its position relatively to the
outer or steam valve by the governor of the engine automatically by means of
adjustable ratchets and worms and worm wheels connected with them so as to
enlarge or contract the area of the opening through the combined valves into the
steam port of the cylinder according to the load on the engine.
And in order that my said invention may be more fully understood I shall now
proceed to describe the drawings on the sheet hereunto annexed, the same letters
of reference indicating the same or corresponding parts of my improvements
throughout all the figures thereof.
Fig. I is an end view of the cylinder of a steam engine arranged with my
said improvements and showing the case, above the cylinder, in which two circular
or tubular valves are enclosed, also portion of the gearing which transmits rotary
motion to the two valves from the crank shaft so as to bring the openings or ports
of such valves opposite to each other at stated or fixed intervals, and the adjustable
ratchets linked by levers and rods to the governor of the engine which thereby
automatically adjusts the openings or ports of the inner or cut off valve, as required,
through worms and worm wheels enclosed in a box wheel on the driving spindle
of the inner or cut off valve. An ordinary exhaust valve case is also shown, below
the cylinder.
Fig. II is a side view of the case in which the circular or tubular valves are
enclosed, having a cross section of such valves exposedi so as to show the openings
or ports in the same and the steam port of the cylinder, and also a cross section
of the box wheel exposed so as to show the worms and worm wheels connected
with the adjustable ratchets shown in Fig. I and the blocks by which such worms
and wheels are stayed, and
Fig. III is a longitudinal section of the two valves and containing case enlarged
showing openings or ports in such valves, the shaft and toothed wheel through
which the outer or steam valve is rotated, and the adjustable ratchets worms and
worm wheels through which the position of the inner or cut off valve is altered
within the outer or steam valve, and the box wheel in which such worms and worm
wheels are enclosed.
a is the end of a cylinder of a steam engine, and b is the case enclosing two
circular or tubular valves of which c is the outer or steam valve, and d is the
inner or cut off valve; c, e, e¹, el, are the openings or ports in the valves respec-
tively, and is the steam port of the cylinder, a; g, g, are adjustable ratchets
actuated by the governor and attached to a ring disc, h, which slides in either
direction along feathers upon a flanged sleeve, i, bolted to and revolving with, j,
the box wheel, fixed near the end of the spindle, k, driving the inner or cut off
valve, d, and fitted over the extended arm of, t, the bonnet or cover of the valve
casing, b, within which such spindle revolves; m is the worm wheel which is
keyed to the driving spindle, k; and n, n, are the worms gearing therewith;
o, o, are pinions upon the spindles carrying the worms, n, n, and in gear with the
adjustable ratchets, 9, 9; P, p, are curved and recessed blocks fitted within the
box wheel, j, and having bearings for the spindles which carry the worms, n, nt,
and pinions,
and
held firmly between
side of
the
the box
wheel, j, and the flange of the sleeve, i, by bolts passing through them; is
the governor rod, and r, s and t are levers and a rod connecting it with the disc, h,
to which the adjustable ratchets, g, g, are attached, whereby the governor of the
engine automatically alters the position of the inner or cut off valve in its relation
to the outer or steam valve according to the load upon the engine, making the
cut off shorter or longer as required; u is the spindle which revolves the outer
or steam valve, c, and is itself driven by the wheel v; w, a and y are gearing wheels
transmitting rotary motion from the crank shaft to the steam and cut off valves
through the wheels and j respectively and z is the piston rod of the engine.
0,
0,

page_text: But I may dispense with the rod, t, and substitute for the lever, s, a forked lever
to catch the disc, h, at diametrically opposite points.
By the arrangements I have described, when the engine has a light or inter-
mediate load the governor acting on the inner or cut off valve will alter its position
relatively to that of the outer or steam valve so as to diminish more or less the
area of the opening through the two valves and consequently the volume of steam
passing into the cylinder, while on the other hand, when the load is heavy and
a greater volume of steam is needed to drive the engine, the inner or cut off valve
will be turned in the opposite direction so as to bring the full openings or ports of
both valves into exact juxta position.
Having now fully described and ascertained the nature of my invention
and in what manner the same is to be performed, I would have it to be understood
that I do not claim as of my invention or the exclusive use of revolving circular or
tubular valves with two or more openings or ports, adjustable ratchets, worms and
worm wheels except when the same are constructed actuated and employed in the
manner and for the purposes hereinbefore described, nor do I claim spindles,
box or other wheels or pinions, flanged or other sleeves, bonnets, blocks, levers or
rods nor any of the separate mechanical parts of my improved apparatus, but I
declare that what I claim is:-
1. The use in high speed steam engines of two circular or tubular valves, one
within the other, revolving in opposite directions, constructed and employed sub-
stantially in the manner and for the purposes hereinbefore described and shewn
in the drawings hereunto annexed.
2. The use in high speed steam engines of adjustable ratchets connected with
worms and worm wheels and actuated automatically by the governor in accordance
with the load upon the engine, arranged and employed substantially in the manner
and for the purposes herein before described and shewn in the drawings hereunto
annexed, and
3. The combination and arrangement of parts constituting my improved steam
valves and means of adjustment thereof, constructed actuated and employed sub-
stantially in the manner and for the purposes hereinbefore described and illustrated
by the drawings hereunto annexed.
Dated this 8th dow of Fabru 1899
HUGH
HYNDMAN,
10, Chichester Street, Belfast,
Agent for Applicant.