Improvements in Rotary Engines, Pumps, Blowers, Exhausters, and Motors.
Year: 1898

page_text: Date of Application, 31st Dec., 1898-Accepted, 18th Mar., 1899
COMPLETE SPECIFICATION.
Improvements in Rotary Engines, Pumps, Blowers, Exhausters,
and Motors.
I, JOHN WILLIAM JOHNSON, Engineer and Managing Director, of The Metrofan
Spinning and Weaving Manufactory, of St. Petersburg, Russia, do hereby
declare the nature of this invention and in what manner the same 18 to be
performed to be particularly described and ascertained in and by the following
statement :-
My invention refers to rotary engines for steam, air, gas, water, or other motive
agency, and consists of certain improvements to be hereinafter described The
object of the invention is to provide a mechanism possessing superior efficiencies
and capabilities for use, and the invention consists essentially in the construction,
arrangement, and combination of parts substantially as hereafter described
In the accompanying drawings illustrating my invention, Fig 1
sectional elevation of my improved rotary engine constructed in accordance with
my invention.
shows
Fig 2 a longitudinal section (partly in elevation) of the same with air pump,
and condenser. Fig. 3 is a cross section of the air pump and condenser Fig +
is a half sectional plan with the bonnet of abutment removed
Fig 5 is a ground plan of the rotary engine condenser and air pump Fig 5
a cross section through the sliding abutment Fig 7 a cross section of the
piston block and packing & side rings Fig 8 a longitudinal section of part of
the piston block and packing Fig 9 a section through the joint of the side
packing rings. Fig. 10 an elevation and part section, showing the arrangement
of valves reversing gear, and loose valve boxes, for engines with double abut-
ments. Fig 11 is a plan of the reversing gear.
A is the cylinder o casing channeled to receive the piston block, B The
sides of the casing A are bored out to allow of the introduction of the disc C to
which the piston block B is secured by bolts Through the top of the casing A
passes a sliding abutment D which rests on the periphery of the disc C sliding
upwards by means of the wedge shape of the piston block B and brought down
again by a spiral spring E connected by the valve rod F which passes through
a stuffing box G and 18 attached at its upper end to a cushioning piston H which
receives the lower end of the spiral spring E The cushioning piston H works
in the cushioning cylinder I on which one cast two standards with a cross piece J
through which passes a regulating screw K for increasing or diminishing the
pressure of the spiral spring E The cushioning cylinder I is fitted with a
screw L for increasing or diminishing the outlet of air, and thus increasing or
diminishing the amount of oushioning The sliding abutment D can be taken
out by removing the cover M, which is screwed to the casing A by bolts and
studs On each side of the abutment there is a port N, O (see Fig 1)
In non-reversible engines O is the exhaust port which 18 constantly open, N
is the steam port, which is opened and closed by the valve T, worked by a lever
and rod actuated by eccentric Q see Fig. 2. The valve P may be fitted with trip

page_text: stroke
gear, controlled by a governor thus cutting off steam at the required part of the
The abutment (Fig 6) which is faced all over, slides against facings a
be, in the abutment casing, the lower edge of D being ground to fit the periphery
of the disc C thus making a good steam Joint The lower edges of the abut-
ment Dare bevelled off, thus allowing the abutment to follow any wear on the
dise C without coming in contact with the side packing ings R The side
packing ungs Raie split with an overlapping joint d Fig 9, so as to open out
and take up any expansion of the casing A. They are also so constructed as to
receive glands S which are packed with suitable packing and thus prevent any
leakage of steam
The inner edges e of packing rings Rare bored a little eccen-
tric, likewise the inner edges f of the disc C, thus allowing, during the 1otation
of the disc C, the edges ef to work past each other, and prevent the formation
of a ridge
f
The glands S are screwed up by pins, and nuts T whereas the packing rings R
are kept up to the facings g on the disc C by set screws U and spings The
piston block B Figs 7 and 8, 18 a wedge shaped block with a recess 11, which
receives the piston packing pieces 12 These are kept in position and forced out
against the sides and outer surface of the channel in the chamber A, by a spiral
spring 13, which forces the block 20 downwards and the plate 20° upwards thus
acting on levers 14, the ends of which take into recesses in the block 20 (see
Fig 8) the pivots 15 of which levers rest on inclined surfaces 16 in the piston
block, thus forcing the end of the level 17 outwards and the bosses 18 of the
lever upwards at one and the same time By an arrangement shown in Figs ĭ
and 8 the compression of the spring 13 and consequently the tightening of the
packing pieces 12 may be increased or diminished by turning a spindle 19 on
which a nut inside the block 20 (see Fig 8) 18 screwed, which is raised or lowered
as desired.
The main shaft 21 on which the disc C is keved, is supported by pedestals 22
(see Fig 2) which rest on wedge blocks 23, by which they can be raised to take
up any downwear of the pedestal brasses, which would throw the disc C out of
concentricity. with the chamber A The exhaust pipe 24 leads from exhaust port
in the chamber A to the condenser 25 (Fig 3) On the exhaust pipe there is an
injection branch 26. The air pump 27 18 driven off the end of the main shaft,
as shown in Fig 2 The disc, abutment slide piston block, chamber, and side
packing rings of the said air pump being on the same principle as the engine
heretofore described The admission port has a suction valve 28, and the exhaust
port a delivery valve 29 Fig 10 shows in partial sectional elevation and Fig 11
plan view, an engine with two abutments, and two sets of levering valves and
gear. The disc C has two piston blocks in a line opposite each other, and are of
double wedged shape, so as to allow the abutment to slide up in both directions
of rotation The valves are worked in the following manner:
30 is a rocking shaft on which a level 31 and slotted link 32 are fixed The
lever 18 acted upon by an eccentric 33 keyed on the main shaft, and connected
to the lever, by the eccentric rod and straps 34 A block 35 sliding in a slotted
link 32 is held in position by a link 36, the other end of which is attached to a
lever 37 on the reversing shaft 38 on which is also fixed a reversing lever 39, 'n
the fork end of which is a swivel block through which is inserted a screwed
shaft 40 to the end of which is attached a reversing wheel 41. To the stud pass-
ing through the block 35 18 coupled a radiating link 42, connecting the rocking
lever 43, to which are attached coupling 1ods 44, 45 for working the valves. It
will be seen that by bringing the radiating link 42 to the point a of the slot a
reverse movement will be obtained. The slot 18 placed at such an angle that
when the block 35, is moved down to the point a the valves are moved iound to
the position required for converting the steam admission valve into an exhaust
valve and rice versa
The valves are so set that whilst the abutment D is sliding over the piston
block B the steam 18 shut off by the valve P and is only admitted again when the

page_text: abutment D is resting on the periphery of the disc C thus preventing any escape
of steam into the exhaust There is a groove see Fig 7, cut in face of the
side packing rings R into which oil is introduced for lubricating purposes. In
the packing pieces 12 in the piston block B there are inserted brass tongues 2 for
preventing the escape of steam at the point & after wear has taken place in the
packing pieces 12, and the sides of disc C A cover 46 on the casing A see Fig. 1,
is for taking out the piston rings eto for examination or removal 47 see Fig 6
18 a brass pocket let into the side packing ing R to allow of the downwear of
the abutment D and also for the wear of the periphery of the disc C Compound
or triple expansion engines can be constructed on this principle, by coupling to
the main shaft 2, 3, or more cylinders of suitable dimensions
The engine above described is also applicable as a pump exhauster, blower,
meter or the like
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim 18-
First: The arrangement of the packing pieces in the piston blocks, substan-
tially as herein before described and illustrated by the drawings annexed, so as
to be practically steam-tight
Secondly The arrangement of the side packing, substantially as herein before
described and illustrated by the diawings annexed, so as to work practically
steam tight up to the periphery of the evolving disc, and
Thirdly. The aangement of the sliding abutment substantially as herein-
before descubed and illustrated by the drawings annexed so as to be practically
steam tight.
+ .
GEO DAVIES & SON,
Agents for the Applicant,
4, St Ann's Square, Manchester.