Improvements in and connected with Steam and like Engines.
Year: 1898

page_text: Date of Application, 18th Aug., 1898
Complete Specification Loft 17th May 1800_Accented 8th July 1800
Improvements in and connected with Steam and like Engines.
A communication from abroad by CHARLES ARTHUR MARCHANT, Supervisor of
Government Workshops, Cuttack, India.
I, EDMUND HUNT, of 121, West George Street, in the County of Glasgow,
North Britain, Patent Agent, do hereby declare the nature of this invention
to be as follows, that is to say:
-
This invention relates to steam and like engines which in constructive features
are similar to what is described in my Patent Specification No. 22,385 of 1897;
and it comprises modifications or improved adaptations of such engines or
motors.
In such apparatus a piston of circular form is fixed to the edge of a disk and
moves in an annular chamber concentric with the disk. In one modification of
the improved apparatus the disk and piston rotate continuously, the disk being
fixed on
a shaft, from which the power developed is transmitted At dia-
metrically opposite parts of the chamber sliding abutments are arranged which
are moved so that when each, in turn, is opened for the passage of the piston the
other is closed. The abutments are moved by levers connected to a pair of
pistons working in a small cylinder to the ends of which steam is admitted
alternately by means of a slide valve deriving its movement from a pair of
eccentrics on the disk shaft. The two pistons whilst moving the abutments also
act as a distributing valve to put in communication with the steam inlets and
with an exhaust port passages leading to suitable parts of the annular chamber,
and across such passages there is a rotating valve the position of which deter-
mines the direction of rotation.
In another modification the engine is constructed to work with two stages of
expansion. The engine consists of two semi-circular chambers of different cross-
sectional areas; and the disk has fixed to it two diametrically opposite pistons of
sizes adapted to the two chambers. The disk does not rotate continuously but
reciprocates angularly through nearly a semicircle.. A crank on the disk shaft
acts through a connecting rod on a crank on a separate flywheel shaft arranged
to make a complete rotation for each to-and-fro movement of the crank on the
disk shaft. The valve gear for this modification is similar to that described in
the earlier specification hereinbefore referred to.
The casing is made in halves which are bolted together, each having formed
in it half of the annular piston chamber, that is an annular groove of semi-
circular form in cross section. To facilitate the planing or shaping of this
groove and render it accurate the tool holder is mounted on studs on two worm-
wheels turned together by worms on a shaft. The tool holder is kept parallel,
its cutting point being moved in a semicircle having the same radius as the
studs on the worm wheels, the studs being adjustable thereon.
Dated this Savanteenth day of Avonst 1000

page_text: A communication from abroad by CHARLES ARTHUR MARCHANT, Supervisor of
Government Workshops, Cuttack, India.
I, EDMUND HUNT, of 121, West George Street, in the County of Glasgow,
North Britain, Patent Agent, do hereby declare the nature of this invention
ánd in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement, that is to say -
This invention relates to steam and like engines which in constructive features
are similar to what is described in my Patent Specification No. 22,385 of 1897;
and it comprises modifications or improved adaptations of such engines or
motors.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append three sheets of explanatory
drawings to be hereinafter referred to in describing my improvements..
Figure, 1, on Sheet, 1, of the drawings is a side elevation partly in section,
and Figure, 2, is a transverse vertical section of one modification of my improved
apparatus. Figure, 3, on Sheet, 2, is a side elevation, and Figure, 4, is a
transverse vertical section of another modification. Figure, 5, on Sheet, 3, is a
plan, and Figure, 6, is a side elevation of details used in connection with. the
improved apparatus. In these drawings the same reference letters and numerals
are used to mark the same or like parts wherever they are repeated.
In apparatus such as is described in my earlier Patent Specification herein-
before referred to, a piston of circular form is fixed to the edge of a disk, and
moves in an annular chamber concentric with the disk. According to one
modification of the improved apparatus as shown in Figures, 1, and 2, the disk, A,
and piston, B, rotate continuously in the annular chamber, C, the disk being
fixed on a shaft, D, from which the power developed is transmitted.
The
shaft, D, revolves in bearing blocks, D1, fixed or formed on the framing, gland
bearings, A. 1, being provided to receive the boss or hub, A2, of the disk. At
opposite parts of the annular chamber, C, sliding abutments or partitions E, shown
by dotted lines in Figure, 1, and F, are arranged, which are moved so that when
each, in turn is opened for the passage of the piston, B, the other is closed. The
abutments E, F, are formed with rods E 1, F 1, which are connected to levers, G, H,
centered on pins G 1, H 1. The levers, G, H, are moved by being connected by
rods, J, J1, to a pair of pistons, J2, J3, working in a small cylinder, J4, to
the ends of which steam is admitted alternately by means of a slide valve K,
working over admission ports, K1, K2. The slide valve, K, derives its move-
ment from a pair of eccentrics, L, L1 as in ordinary steam engines, the slide
valve-rod, K, being connected to the eccentric rod quadrant link, L2, by a
rod, K4, jointed to the rod and to one end of a lever, K5, centered on a pin, K 6,
the other end of the lever working in the quadrant slot, L3. The two
pistons, J2, 33, whilst moving the levers, G, H, and the abutments E F, also
act as a distributing valve, to put in communication with the steam inlets, K1, K2,
and with an exhaust port, K7, passages, M; M1, M2, M3, leading to suitable
parts of the annular cliamber, C. Across the passages a rotating valve or
cock, M4, is fitted, its position determining the direction of rotation of the
piston, B. The cock, MA, is formed with two sets of openings, M6, M7, formed
on each side of a middle partition, MS, and when steam enters through the
distributing valve ports, J5, JG, it passes through the openings, and into the

page_text: passages leading to the annular chamber. In the drawings the cock, M4, is
shown in a position to admit steam to the passages, M1, M2, and thereby give a
left-hand rotative movement to the piston, B. The steam, for example, entering
the annular chamber, C, by the passage, M 1, acts against the underside of the
closed abutment E and the piston, B, and when the piston has moved round
sufficiently steam enters by the passage, M2, and acts against the upper side
of the now closed abutment, F, and the piston, and so continues the further
rotation of the latter in a left-hand direction as described. By giving the
cock, M4, a quarter turn the passages, M1, M2, are closed and the open-
ings, M6, M7, are put in communication with the passages M, M3, so as to
admit steam to the annular chamber and give a right-hand rotative movement
to the piston, B. The engine is stopped by placing the cock, M4, in a middle
position, so that all the passages, M, M1, M2, M3, are closed. The exhaust
emission is regulated by the distributing valve or pistons J2, J3, the exhaust
steam leaving the annular chamber, C, by the exhaust port, K 7, and outlet, K 8:
The cock, 4, is arranged to be worked in conjunction with the slide valve
reversing lever, N, being connected to it by a suitable link and lever attachment
(not shown) so that in whatever position the lever is placed, the cock will occupy
a corresponding position. To suit the present position of the reversing lever, N,
the cock ought to be shown closed but to facilitate explanation of the parts it
has been shown in an open position, as if the lever, N, had been shifted from its
middle position.
In another modification shown in Figures, 3, and 4, the engine is constructed
to work with two stages of expansion. The engine consists of two semicircular
chambers, P, Q, of different cross-sectional areas and the disk, A, has fixed to it
two diametrically opposite pistons (not shown) of sizes adapted to the two
chambers. The disk does not rotate continuously but reciprocates angularly
through nearly a semicircle. A crank, R, on the disk shaft, D, acts through a
connecting rod, R 1, on a crank, R2, on a separate flywheel shaft, R 3, which is
arranged to make a complete rotation for each to-and-fro movement of the crank
on the disk shaft. The valve gear for this modification is similar to that
described in the earlier specification hereinbefore referred to.
The casing of the apparatus is made in halves which are bolted together, each
having formed in it half of the annular piston chamber that is an annular
groove of semicircular form in cross section. To facilitate the planing or shaping
of this groove and render it accurate the tool holder, S, (Figures, 5, 6,) is
mounted on studs, S1, S2, fixed to wormwheels, T, T 1, centered on pins, T2, T3,
on a saddle or slide rest, T4, the worm wheels being turned together by
worms, U, U 1, fixed to a handled shaft, U2. By this arrangement the tool-
holder, S, is with the tool, S3 kept parallel the point being moved in a semi-
circle (shown by dotted lines) having the same radius as the studs, S1, S2, on
the worm wheels. The studs, S1, S2, are fixed in grooves, $4, S5, so that they
can be adjusted to suit any radius within certain limits.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed I declare that what
I claim is:-
1. In a rotatory engine, providing for the continuous rotation of the piston and
its disk, by employing abutments, or partitions, which are moved alternately
across the piston chambers by levers actuated by a pair of small pistons worked
by the main steam supply admitted to the ends of the pistons by a slide valve,
deriving movement from eccentrics, the small pistons also acting as a distributing
valve to put in communication with the steam inlets and exhaust ports passages
leading to the annular chamber, a rotating valve or cock formed with openings
working across the passages, to act as a stop valve, and to determine the direction
of rotation of the disk, the valve or cock being worked in conjunction with the
valve reversing lever, the parts being combined arranged and operating sub-

page_text: stantially as hereinbefore described with reference to Figures, 1, and 2, of the
accompanying drawings.
2. In a rotatory engine, constructing the engine to work with two stages of
expansion, by providing two semiannular piston chambers of different cross
sectional areas, the pistons working in the chambers being fixed to a disk which
reciprocates angularly through nearly a semicircle the crank on the disk shaft
acting through a connecting rod on a crank on a separate fly-wheel shaft,
arranged to make a complete rotation for each to-and-fro movement of the disk,
substantially as hereinbefore described with reference to Figures, 3, and 4, of
the accompanying drawings.
3. In rotatory engines, facilitating the planing or shaping of each half of the
annular main piston chamber, by mounting the tool holder on studs fixed to
wormwheels, turned together by worms on a handled shaft, so that the tool
holder is with the tool kept parallel the point being moved in a semicircle, the
studs being adjustably fixed in grooves in the wormwheels, substantially as
hereinbefore described with reference to Figures 5, and 6, of the accompanying
drawings.
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