Year: 1897

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
to be as follows, that is to say:-
This invention has for its object, by an improved construction and arrange-
ment of parts, to obtain from one reciprocation or to-and-fro movement of a
piston two revolutions of a crank shaft, in the case of a motor driven by steam
or other fluid, the same arrangement giving one reciprocation of a piston for
two revolutions of the driving shaft in the case of a pump, the piston in either
case having a relatively long stroke.
In a motor constructed according to the invention the piston chamber is in the
form of a circular arc extending nearly to a complete circle the ends of the
chamber being formed by the faces of a block which occupie the space com-
pleting the circle. The piston is fixed to a disk fast on a shaft concentric with
the piston chamber. The piston moves round the chamber from one side of the
block to the other and back again. The piston chamber may be circular as
sectioned by a plane radial to the axis of the shaft, or it may be rectangular
or of any other suitable form.
The shaft, or piston shaft, as it may be termed, has fast on it externally a
crank arm which is connected by a connecting rod to a crank shaft having a fly-
wheel fast on it. The crank shaft is in a plane passing through the piston shaft
and the block; and the throw of its crank is somewhat less than that of the
piston-shaft crank arm, and such that the crank makes about a complete turn
whilst the piston moves from one end of its chamber to the other.
The piston chamber is provided with passages and a distributing valve or
valves like those of an ordinary steam cylinder, the valve or valves being moved
by means of eccentrics and link motion or other gear from a shaft (or a sleeve
on the piston shaft) driven from the crank shaft at half its speed by means of
spurwheels.
The arrangement for a pump is the same as for the motor (excepting as
regards the valves) but with the actions reversed, the crank shaft being the
driver.
A motor and pump of the improved kind may be conveniently combined in a
compact manner, and two or more motors or pumps may be combined.
Dated this Twenty-ninth day of September 1897.

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
and 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 has for its object by an improved construction and arrange-
ment of parts, to obtain from one reciprocation or to-and-fro movement of a
piston two revolutions of a crank shaft, in the case of a motor driven by steam
or other fluid, the same arrangement giving one reciprocation of a piston for
two revolutions of the driving shaft in the case of a pump, the piston in either
case having a relatively long stroke.
A motor and pump of the improved kind may be conveniently combined in
a compact manner; and two or more motors or pumps may be combined.
And in order that the said invention and the manner of performing the same
may be properly understood I hereunto append two sheets of explanatory draw-
ings to be hereinafter referred to and showing a combined motor and pump
of the improved kind.
Figure, I, on the accompanying sheet of drawings is a side elevation partly
in section, Figure, 2, is a transverse vertical section and Figure, 3, is a plan
of a motor and pump of the improved kind as combined in a compact manner.
In these drawings the same reference letters and numerals are used to mark
the same or like parts wherever they are repeated.
In the combined motor and pump shown in the drawings the piston cham-
ber, A 1, of the motor and the pump chamber, A2, of the pump are in the form
of a circular arc, the chambers being each made in two parts bolted together
round the circumference and extending nearly to a complete circle the ends of
each chamber, A1, A2, being each formed by the faces of a block, (one, B, of
which is shown in Figure, 1) which blocks occupy the spaces so as to complete
the circle in each chamber. The engine piston, C1, is fixed to a disk, D1, and
the pump piston, C2, is likewise fixed to a disk, D2, both disks, D1, D2, being
keyed on a shaft, E, concentric with the chambers, A1, A2. The pistons, C1, C2,
move round their chambers, A1, A2, from one side of the block, B, in each
chamber to the other and back again. The piston chambers, A1, A2, and the
pistons, C1, C2, instead of being circular in cross section as shown may be
rectangular or of any other suitable form. The disks, D1, D2, are packed by
concentric rings, E1, E2, held in position by springs, F1, F2, which with the
rings are held in recesses in the casings of the chambers, A 1, A 2.
The shaft, or piston shaft, E, as it may be termed, has fast on it externally
a crank arm, G, which is connected by a connecting rod; G 1, to a crank pin, H,
on a flywheel, H1, fast on a crank shaft, H2. The crank shaft, H2, is parallel
to the piston shaft, E, and the throw of its crank pin, H, is somewhat less than
that of the piston-shaft crank arm, G, and such that the crank shaft, H2, makes
a complete turn whilst each piston, C1, C2, moves from one end of its cham-
ber, A1, A2, to the other.
When the improved apparatus is to be used as a motor only the power derived
by converting the reciprocating motion of the piston, C1 into the rotatory motion
of the crank shaft, H2, as hereinbefore described, may be transmitted from
that shaft by any suitable gearing.

page_text: The piston chamber, A 1, of the motor is provided with passages and a distribu-
tion valve, J, (or valves) like those of an ordinary steam cylinder, the valve, J,
being moved by means of an eccentric, J 1, and rod, J 2, attached to the valve
spindle, J3, the eccentric, J1, being on a shaft, K, driven from the crank
shaft, H2, at half its speed by means of spurwheels, K 1 K 2.
The piston chamber, A2, of the pump is provided with a valve chest, L, and
suction and delivery valves (two of which L1, L2, are shown in Figure, 2) of
the ordinary double-acting type, the water entering by a pipe, M 1, and being
delivered from a pipe, M 2.
When the improved apparatus is to be arranged for pumping only the crank
shaft, H2, will be the driver receiving its motion from any suitable source.
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:-
A motor or pump having a piston reciprocating in a chamber through nearly
a complete circle and fixed on a disk fast on a shaft which has on it a crank
arm connected by a rod to a crank arm on a flywheel shaft, the said crank arms
being proportioned so that the flywheel shaft makes a complete turn for each
incomplete circular movement of the piston, the parts and accessory details
being constructed, arranged, and operating substantially as hereinbefore
described,
.
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1000