Improvements in Reversible Rotary Steam Engines.
Year: 1899

page_text: Date of Application, 1st May, 1899-Accepted, 9th Sept., 1899
COMPLETE SPECIFICATION.
Improvements in Reversible Rotary Steam Engines.
I, JAMES JACKSON, of corner of 8th and F. Streets, N.W., Washington, D.C.,
United States of America, 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 reversible rotary steam engines;
and the object is to provide a simple, inexpensive and efficient motor of this
character.
To this end, the invention consists in certain features of construction and
combination of parts which will be hereinafter fully described and claimed.
In the accompanying drawings:-
:-
Figure is a vertical longitudinal section of my improved reversible rotary
steam engine.
Figure 2 is an end elevation.
In the drawings, 1 denotes the casing, 2 the steam chest, and 3 the rotating
drum fixed on the shaft 4 journaled in suitable bearings fixed on the removable
side plates of the casing. The drum 3 is formed with a continuous series of
radial buckets 5-5 extending entirely around its periphery.
Gdesignates the upper exhaust port, and 7 the lower exhaust port, which also
forms an exit for the water of condensation, which may form in the casing
while the engine is in operation.
8-8-8 denote the live steam ports when the steam is admitted to rotate the
drum in the direction of the arrow, and 9-9-9 the corresponding live steam
ports, which are in use when the engine is revolving in the opposite direction.
10 denotes the slide or throttle valve which is provided with a stem extending
through the steam chest, and 13 denotes the steam pipe leading direct to the
boiler.
The operation is very simple, the starting, stopping, and reversing, and the
speed, being all regulated and controlled by the single valve 10, which, when
moved to cover all the ports, cuts off the steam from the drum, and causes it to
stop. If it is desired to start the drum in the direction of the arrow, the valve
is moved to the right, which uncovers one or more of the ports 8, the ports 9
remaining closed, and reversely, if it is desired to start the engine in the oppo-
site direction, the valve is moved to the left to close the ports S, and open the
ports 9, which admits steam to the opposite side of the drum, thereby causing
it to rotate in the direction opposite to the arrow.
It will of course be understood that various changes in the form, proportion.
and the minor details of construction, may be resorted to without departing
from the principle, or sacrificing any of the advantages of this invention.
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:
In a reversible rotary steam engine, a casing provided with a steam chest, a

page_text: drum formed with radial buckets and mounted in the case, a duplex series of
diverging steam ports extending from the casing to the steam chest, and a
valve mounted in said chest and arranged to control the passage of the steam
from the chest through the ports to the drum, substantially as described for the
purpose set forth.
Dated this 27th day of Anril 1899
WHEATLEY & MACKENZIE,
40. Chancery Lane, London, W.C., Agents.