Improvement in Rotary Engines. Page: 6 of 6
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i 398,8662
of both drums B B' coincide with each other, said drum and exhausts through a' on the op-
and are located below the axis of the engine- posite side of the piston, thus giving one rev-
shaft C, and the peripheries of both drums are olution to the engine. This action of the steam
turned true and smooth. I have represented takes place on both sides of the diaphragm
the eccentrics c c', around which the said drums simultaneously; and I will now explain in what
revolve, as being made expansible, so that manner the steam is admitted and allowed to
compensation can be made for wear, but I do escape. I have previously shown how the
not deem expansible eccentrics necessary, and steam enters the body of the engine on one
may use those which are not expansible and side and escapes from the engine on the other
substitute new ones when one pair wears out. side. The diaphragm E is a hollow disk, which
The main portion of each eccentric c is seg- is subdivided by radial partitions, into four
mental, and cut out so as to receive one end steam-passages, as follows: The steam-pas-
of a tube, c', which completes the cylinder, as sage N admits steam through N' into the hol-
shown in Fig. 6. Between the flattened lower low ring A, from which it escapes into cham-
side of the tube c' and the adjacent surface of ber a at a, and acts against the piston D,
the segmental portion c a wedge, w, is applied, pressing the end of the upper wing 3 against
which is secured to a stem, e, that has tapped the periphery of drum B, as shown in Fig. 1.
through its angular outer end a screw, a'. This The passage N' at the same time admits steam
screw passes through the journal-box below through N3 into the ring A', from which it es-
shaft C, and is used for adjusting the wedge capes and acts on the opposite piston D in
ir, when it is desired to expand the eccentric chamber al. The steam from chamber a ex-
c to the hub of the drum that revolves around hausts through e, N', and N'; thence through
it. The outer end of each one of the tubes c' the web of drum B', through collar t, journal-
is rigidly held in its respective journal-box, so box F', hollow standard G', and passage j.
that these tubes will not turn with the engine- The steam from a' exhausts through N' N',
shaft. through the drum B', through journal-box F',
As above stated, the adjustability of the hollow standard G', and passage in. -When
eccentrics is not important, and they may be the valve k is turned so as to admit steam into
made solid on their respective holding tubes. the engine through the standard G', the rota-
It will be seen that the drums B B' will both tion of the engine will be reversed and the
turn with the hollow rings,the diaphragm, and steam, after passing through the chambers a
the heads H H '. Each one of the hollow rings a' and rings A A', will exhaust through the
has a semicircular recess, ai, made into it by journal-box F, standard G, and exhaust-pas-
cutting away its lateral and interior walls, and sage j.
into each recess a three-winged piston, D, is Ha vingdescribed myinvention, whatIclaim
applied, which oscillates freely by its pivots s. as new, and desire to secure by Letters Patent,
The wing 2 of each piston is perpendicular to is-
the wings 3 3, and these latter are of equal 1. The perforated revolving drum B, ar-
length and curved so as to present an are ranged eccentrically within a chamber, a,
which is concentric to a circle touching the which is surrounded by a hollow ring, A, in
inner surface of the inner wall of the hollow combination with the oscillating piston 1) and
ring A or B, and the axis of motion of each hollow diaphragm E, substantially as de-
piston is so arranged that the inner continn- scribed.
ous surface of the two wings 3 3 will be con 2. The arrangement of rings A A', pistons
centric to the axis of the shaft C, when the D D, and eccentric drums B B', on opposite
wing 2 is in a line radiating from this axis. sides of the hollow-ported diaphragm E, in
When steam acts against the piston D, in the combination with steam-inlet and outlet pas-
direction of the arrows indicated in Fig. 1, the sages conununicating with the hollow stand-
uppermost wing of the piston will be pressed ards G G', on which the engine-shaft C is sup-
closely against the periphery of the eccentric ported, substantially as described.
drum, and steam will be prevented from en- 3. The combination of the reversible throt-
tering the exhaust passage a' by the wings 2 tle-valve K, hollow standards G- G', hollow
and 3 and the eccentric drum B; but as the journal-boxes F F', and an engine which ro
engine revolves the chamber on the live-steam tales bodily, substantially as described.
side of the piston will gradually increase its JOIN DUN RICHARDSON.
capacity until it finally communicates with the
said exhaust-passage ac. In this way steam Witnesses:
enters the chamber a outside of the drum B, J. R. MoRRis,
on one side of the piston D, passes around the S. D. HEVES.
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Richardson, John Dun. Improvement in Rotary Engines., patent, February 6, 1872; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth165322/m1/6/: accessed July 3, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.