Rotary Engine. Page: 4 of 6
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UNITED STATESPATENT OFFICE.
WARD RISLEY, OF JACKSBORO, TEXAS, ASSIGNOR OF ONE-THIRD TO Z. L. RISLEY AND ONE-
THIRD TO NOAH RISLEY, OF JACKSBORO, TEXAS.
ROTARY ENGINE.Specification of Letters Patent.
Patented Nov. 3, 1908.
Application filed February 24, 1908. Serial No. 417,407.
To all whom it may concern:
Be it known that I, WARD RIsLEY, a citi-
zen of the United States, residing at Jacks-
boro, in the county of Jack and State of
5 Texas, have invented certain new and useful
Improvements in Rotary Engines; and I do
hereby declare the following to be a full,
clear, and exact description of the invention,
such as will enable others skilled in the art
10 to which it appertains to make and use the
same.
This invention relates to improvements in
engines or motors, and while the principles
of the invention may be applied to other
15 types of fluid-operated rotary engines, in-
ternal combustion engines, pumps and anal-
ogous machines, either by reversal of the
operation, or by the addition of obvious de-
tails, still for the purpose of disclosure and
20 for simplicity of illustration the invention
is shown and described as a rotary steam
engine.
In its application as a rotary steam engine
one of the objects is to provide a reversible
25 engine employing either a single cylinder or
a plurality of cylinders.
Another object is to provide means where-
by one of the walls of the cylinder is a
movable wall coSperating with a fixed an-
30 nular wall and a movable abutment to pro-
vide a non-communicating live steam cham-
ber and a dead steam chamber, the live
steam chamber being adapted to increase in
area during a stroke of the piston not only
35 in a circumferential direction, but also in a
radial direction, whereby the inlet end of
said live steam chamber has greater volume
than the opposite end.
Another object of the invention, which is
40 primarily accomplished by the previously
mentioned means, is to provide means for
introducing the effective force of the live
steam against the rotating piston at an angle
substantially at right angles to the longest
45 diameter of the piston, or a plane passing
through the axis of said piston and its point
of contact with the outer stationary wall of
the cylinder, whereby the most effective
power is obtained during substantially the
50 whole stroke of the piston.
Other objects and advantages will appear
from the following specification, the princi
pal features of novelty being pointed out in
the claims, and to more clearly describe theinvention in detail reference is had to the 55
accompanying drawings illustrating a prac-
tical embodiment of the same, in which-
Figure 1 is a vertical sectional view
through one cylinder of a two-cylinder en-
gine on the line 1-1 of Fig. 2. Fig. 2 is 60
a vertical section on the line 2-2 of Fig. 1,
but with the pistons at slightly different po-
sitions, the piston in Fig. 1 being shown as
having started on its cycle, while the corre-
sponding piston in Fig. 2 shows it on dead 65
center. Fig. 3 is a horizontal section on the
line 3-3 of Fig. 1, and Fig. 4 is a bottom
plan view of the reversing valve.
1 designates the base provided with the
usual apertures receiving bolts 2 to secure 70
the engine to its bed, and this base has the
integral side walls or heads 3 and a central
wall 4 where a two-cylinder engine is em-
ployed. These walls are provided with
alining openings 5 to receive and form a 75
bearing for shoulders on the rotary pistons
hereinafter referred to. The base 1 at right
angles to said walls 4 is bored out, and co-
operating with said walls forms the annular
cylinder spaces 6, the upper walls of which 80
are provided with slots 7 opening in said
chambers 6 for a purpose hereinafter re-
ferred to.
The base 1 is surmounted by a substan-
tially solid head 8 which is secured to said 85
base by the usual bolts 9, and this top por-
tion or head is provided with slots 10 regis-
tering at one of their ends with said slots 7,
and at their other ends communicating with
a steam chest 11 formed on said head 8, and 90
provided with a suitably secured cover plate
12 having a live steam pipe 13 bushed there-
in, as customary.
The head 8 is provided with exhaust cham-
bers 14, which may be cylindrical in form 95
and communicate with exhaust pipes 15, said
chambers preferably extending substantially
in the direction of the engine shaft. 16, 16a
designate exhaust ports, shown as cut at an
angle in said head 8, and forming passages 100
between said exhaust chambers 14 and the
steam chest, but of course a valve mechanism
prevents the discharge of the exhaust into
the steam chest, as will hereinafter appear.
17, 17a designate inlet and outlet ports ex- 105
tending through said top 8 from the steam
chest, and at the base of said top member
communicating with said slot 10. 18, 1saNo. 902,762.
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Risley, Ward. Rotary Engine., patent, November 3, 1908; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth509273/m1/4/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.