Rotary Engine. Page: 6 of 6
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of course, is exactly the same, as the valve
24 is provided with two sets of ports and
the piston 30 is reversely mounted with re-
spect to the piston 30.
5 Having thus described the invention, what
I claim is:-
1. The combination with an annular cyl-
inder, a piston therefor and a steam chest;
of a sliding abutment operating in a pas-
10 sageway between said cylinder and steam
chest and projecting against said piston;
inlet and outlet ports between said steam
chest and said cylinder; and a valve in said
steam chest controlling said inlet and outlet
15 ports and providing means to maintain a
head of steam at all times against the outer
end of said sliding abutment, substantially
as described.
2. The combination with an annular cyl-
20 inder, a piston therefor and a steam chest;
of a valved abutment slidingly mounted in
a passageway between said steam chest and
said cylinder; inlet and outlet ports between
said chest and opposite sides of said pas-
25 sageway; exhaust ports between said chest
and atmosphere; and a valve in said steam
chest provided with ports forming com-
munieating passages between said steam
chest and passageway, between said steam
30 chest and the inlet port, and between the
outlet port and the exhaust port, substan-
tially as described.
8. The combination of an annular cyl-
inder, a cylindrical piston rotatably mount-
35 ed therein and engaging the annular wall of
said cylinder at a position on the periphery
of said piston, the annular wall of said cyl-
inder being provided with a slot, a head
member mounted above said cylinder hav-
40 ing a steam chest associated therewith and
provided with a slot alining with the afore-
said slot and communicating with said steam
chest, inlet and outlet ports cut into said
head member and forming communicating
45 passages between said steam chest and the
lower end of the slot in said head member,
a movable abutment operating in said slots
and provided at its inner end with ports
communicating with said inlet and outlet
50 ports and the interior of said cylinder, an
exhaust port, and a valve operating in said
steam chest and provided with ports form-
ing communicating passages between said
steam chest and the slot in said head mem-ber, between said steam chest and said inlet 55
port and between said outlet port and said
exhaust port, substantially as described.
4. The combination of an annular cyl-
inder, a cylindrical piston mounted therein
and engaging at one position of its periphery 60
the wall of said annular cylinder, a sliding
abutment adapted to project in said cylinder
a head member for said cylinder, said head
member and cylinder wall being provided
with alining slots, an abutment operating 65
in said slots and adapted to project in said
cylinder, a steam chest carried by said head
member, a port on each side of said slot ex-
tending through said head member from
said steam chest and communicating with 70
ports formed in the flat faces at the lower
end of said sliding abutment, exhaust cham-
bers in said head member, ports leading
from said exhaust chambers to said steam
chest, and a valve provided with recesses on 75
its underneath face and with a pair of ports
intermediate of said recesses and extending
through said valve, whereby said ports
through said valve cooperate respectively
with said ports through said head member 80
and said slot in said head member and said
recesses in said valve coperate respectively
with one of said exhaust ports and one of
said ports through said head member, sub-
stantially as described. 85
5. The combination of a base provided
with an annular cylinder cut therein, an ec-
centrically - mounted cylindrical piston in
said cylinder, a top member surmounting
said base provided with a steam chest, and 90
said top and base being provided with slots
forming a passageway between said cylinder
and said steam chest, ports cut in said top
and extending from said steam chest to said
slot in said top at its lower end, exhaust 95
chambers formed in said top and provided
with passageways extending to said steam
chest, an abutment provided at its lower end
with ports and operating in said slots, and
a reversing valve provided with recesses in 100
its lower face and intermediate ports extend-
ing therethrough, substantially as described.
In testimony whereof, I affix my signa-
ture, in presence of two witnesses.
WARD RISLEY.
Witnesses:
Tiros. D. SPUN,
F. N. MCCLURE.
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Risley, Ward. Rotary Engine., patent, November 3, 1908; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth509273/m1/6/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.