Improvements in Rotary Engines or Pumps.
Year: 1887

page_text: COMPLETE SPECIFICATION.
Improvements in Rotary Engines or Pumps.
I JOHN LANDELLS 15 Algernon Terrace Tynemouth in the County of
Northumberland Engineer 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, and in order that the same may be fully understood
I enclose three Sheets of Drawings
My Invention has for its main object the using of Steam expansively. The Engine
consists of a Cylinder this is provided with covers. - Two barrels A and B of exact
same diameter. One of these barrels viz.-B is placed in centre of Cylinder, Barrel A
being placed in a bored recess or chamber on the side of Main Cylinder. These
two barrels are brought into frictional contact to keep the Steam or fluid from passing
from side to side, their ends abut into and on the Cylinder Covers which have bored
recesses to receive them. In the barrels are shafts which are carried through glands
in Cylinder covers: On the working ends are geared wheels F & G to keep the
barrels in positively the same position to each other. In the barrel A there is a space
Gap or pocket to allow of the piston C passing every revolution. The piston consists
of a flange or projection dovetailed & bolted to the central part of barrel B: The
The two barrels A & B are of the exact same length the ends of both are extended
past the gap or pocket in A & past the piston in B, this extension is to give both
barrels a continuous bearing surface throughout their peripheries these barrels are
held in frictional contact by adjustable bearings on the shafts.
This Engine Figs. 1 & 3 being made to revolve & work expansively has the
common form of slide valve E placed in a Chest D on Cylinder cover two eccentrics
& link gear is used. There are three ports in steam chest face two end ones steam,
& centre one exhaust, the slide covering one end port to exhaust, the slide is only
allowed sufficient travel to open & close one port to steam, the other being constantly
open to exhaust giving no back pressure. The two Steam ports enter the Cylinder
immediately on each side of the bearing points of the two barrels. To reverse the
Engine the position of the slide E is altered from one end port to the other by screw
gear on the slide Rod at the same time the link motion is reversed, it will be readily
seen from this that the port that was steam in the foregoing now becomes exhaust in

page_text: the astern or back going way, the two end ports in steam chest doing duty as steam
or exhaust as the Engine is caused to rotate. The foregoing explains the working of
single Reversing & Expansion Engine.
a
Fig. 4 shews section of a double Rotary Engine. This consists of two Main
Cylinders & one small Cylinder joining them, in the centre Cylinder is placed the
barrel A with a gap or pocket it doing duty & allowing the pistons C & C to pass
alternately & keeping up a steam tight position betwene Main Cylinders.
The three barrels B, A, B are connected by geared wheels to keep them in
positively the same position to each other the piston in one Cylinder being at end of
stroke when the piston of other is at half stroke substantially as shewn in Drawing.
Figs. 5 & 6 shews another form of reversing & expansion Gear applied to Rotary
Engines it consists in for a single Cylinder Engine of two slides, Fig. 5 H & I, the
top slide H being coupled direct to one eccentric on the shaft, the under slide I being
worked by hand gear, the slide H may have one or two ports through from front to
back, the slide I having two through ports & an exhaust recess between them. To
start the Engine with this gear it is simply necessary to place the under slide I to
open one port J in steam chest the other ports L & M are then connected by exhaust
recess in slide I.
To reverse the Engine the slide I is moved to bring the other end port N in play
with port M in steam chest, when what was the steam port before is connected to the
exhaust. According to the position of the slide I is the Engine made to reverse or
work expansively the slide H has only sufficient travel allowed to open full & close
one port.
Fig. 6 shews section of slide gear for Double Cylinder Rotary Engine this consists
of three Slides two top H & H¹ being coupled direct to the shafts the under slide being
worked by hand reversing gear.
Having now particularly described & ascertained the nature of my said Invention
& in what manner the same is to be performed I declare that what I claim is :
First. A Rotary Engine or Pump consisting of barrels A & B in a suitable casing or
Cylinder A provided with a gap or pocket in its central part, B provided with a wing
or flanged piston fixed to its central part, the barrel ends being extended past the
piston in B & the pocket in A these extended parts allowing of frictional bearing
throughout their peripheries & rolling together at the same speed the pocket is
presented every revolution to allow the pistons or wings to pass substantially as &
for the purpose hereinbefore described & Illustrated in Drawing.
Second. The application of the common form of slide valve & Reversing link gear
in conjunction with the moving of the slide upon the Rod from end port to end
port substantially as & for the purpose hereinbefore described & Illustrated in
Drawing.
Third. The application of two or three Slides for the purpose of reversing &
working expansively, the top slide or slides being coupled direct to an eccentric on
the main shafts the under slide being. worked by hand reversing gear substantially as
& for the purpose herein before described & Illustrated in Drawing.
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