Year: 1886

page_text: I, CHRISTOPHER PETER JÜRGENSEN of No 37 Sortedams Dossering Copenhagen
Denmark Engineer, Professor, and Knight of the Order of Danebrog do hereby
declare the nature of this Invention to be as follows:-
In motors constructed according to my invention the pressure medium such as
steam air or gases is made to act upon a cylindrical "piston" which is arranged
concentric upon a crank in such manner that in the rotation of the crank the
piston is caused to follow along the inside of an enclosing cylinder thus cutting off
the steam in conjunction with a slide valve jointed thereto and arranged between
the fluid inlet and exhaust. These motors are distinguished from the ordinary
cylinder motors by that the fluid while acting on the crank to a certain extent
constantly moves round with it. I thus obtain a better utilization of the power
which for each revolution only has a minimum and maximum. As an advantage
as compared with cylinder engines I may also name that the crank can be
lubricated by means of a stationary grease cup and passages therefrom. As
compared with other rotary engines my motors have the advantage that the
cylindrical "piston" acted directly upon by the pressure fluid and closing tightly
against it does not rotate but has a progressing partly rolling motion. I thus
obviate the objection against rotary engines viz. That the tightness or fit between
the rotating body and the inside of the cylinder is destroyed comparatively soon
by wear because the contact between the two surfaces always takes place at the
same points of the rotating body. But by my aforesaid progressive and partly
rolling motion all the parts of the inside of the cylindrical piston come in contact
with the inside of the cylinder in each revolution. I will describe the invention as
applied to a twin cylinder engine.
The cylindrical pistons on which the pressure fluid acts are arranged concentrically
on the crank pins of the shaft by means of radial struts with suitable brasses. Each
piston is within its enclosing cylinder which has a hollow slide valve working
about radially thereto and connected with the piston by a cylindrical joint piece
the two together shutting off or forming the abutment for the pressure fluid. The
exhaust passage may be arranged by the side of the slide valve. The onesided
pressure which the fluid exerts on the slide valve when the latter protrudes more
or less into the cylinder is more or less counterbalanced by the pull or pressure
which the piston during its motion exerts thereon. The two cranks are at 180° to
each other so that the power exerted in one may be at about its maximum while it
is at its minimum in the other. The pressure, fluid may in various ways be let

page_text: into the acting space behind the piston and slide valve. It may pass from the inlet
through an oscillating hollow cylinder valve, a port, and corresponding port in the
slide valve into a hollow space within the latter. The slide valve may obtain its
motion by a crank which by an eccentric rod is oscillated from an eccentric on the
engine shaft. The bottom of the slide valve fits around the aforesaid cylindrical
joint piece on the side of the piston and is jointed thereto by two pins which have
rods that reach up through the slide valve and with their pins or heads are inserted
sideways into the cylindrical joint piece so as to be concentric therewith. These
joints may however be constructed in many other ways. The joint piece is hollow
and has an upper port and a lateral port which communicate with the interior of
the hollow slide valve when the piston is at its highest point and remain in
communication until the piston in question is about passing its lowest position.
As the eccentric can be shifted on the shaft for causing the slide valve to open for
the pressure fluid at a more or less early stage before the slide valve begins to
communicate with the hollow joint piece while the oscillating inlet valve also lets
the pressure fluid pass through during the same are of revolution of the shaft
independently of the position of the eccentric on the shaft, the expansion or cut off
may be regulated by shifting the eccentric on the shaft.
Instead of admitting the pressure fluid by the hollow joint piece it may be let
into the acting space of the cylinder by the side of the slide valve by varying the
arrangement of porta. The variable expansion may then be effected as before if
another oscillating cylinder valve is applied which is worked by a separate 'eccentric.
By arranging the exhaust ports like the inlet passages and by application of means
for at will admitting the fluid through either of the two sets of passages while the
other set is used for exhaust the engine may be used for rotating in one direction
or the other, for reversing, the slide valves being then of course by suitable means
prevented from shutting off that set of passages which momentarily is used for
exhaust.
Improvements in Rotary. Engines.
1
- I 'CHRISTOPHER PETER JORGENSEN of No 37 Sortedams, Dossering, 'Copenhagen,
Denmark, Engineer, Professor, and Knight of the Order of Danebrog 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:-
..iq
1. 2
-
U
.
4.
17
In motors constructed according to my invention 'the 'pressure 'medium such ab
steam, air or gasses is made to act upon a cylindrical "piston" which is arranged

page_text: concentric upon a crank in such manner that in the rotation of the crank the piston
is caused to follow along the inside of an enclosing cylinder, thus cutting off the
steam in conjunction with a slide valve jointed thereto and arranged between the
fluid inlet and exhaust. These motors are distinguished from the ordinary cylinder
motors by that the fluid while acting on the crank to a certain extent constantly
moves round with it. I thus obtain a better utilization of the power which for
each revolution only has a minimum and a maximum. As an advantage as com-
pared with cylinder engines I may also name that the crank can be lubricated by
means of a stationary grease cup and passages therefrom. As compared with
other rotary engines my motors have the advantage that the cylindrical "piston "
acted directly upon by the pressure fluid and closing tightly against it does not
rotate but has a progressive partly rolling motion. I thus obviate the objection
against rotating engines vide licet that the tightness or fit between the rotating
body and the inside of the cylinder is destroyed comparatively soon by wear
because the contact between the two surfaces always takes place at the same
points of the rotating body. But by my aforesaid progressive and partly rolling
motion all the parts of the inside cylindrical "piston" come in contact with the
inside of the cylinder in each revolution.
I will describe the invention as applied to a twin cylinder engine; Figure 1
being an end view, Figure 2 a side view of the engine, and Figures 3 and 4 corre-
sponding vertical sectional views. Figure 5 is an enlarged face view of the slide
valve, Figure 6 a plan view, Figure 7 a section on line m n Figure 5, and
Figure 8 a section on line p. q. Figure 5.
The cylindrical pistons D on which the pressure fluid acts are arranged con-
centrically on the crank pins E of the shaft F by means of radial struts A with
suitable brasses. Each piston is within its enclosing cylinder H which has a
hollow slide valve B working about radially thereto and connected with the piston
by a cylindrical joint piece P, the two together shutting off or forming the
abutment for the pressure fluid. The exhaust passage R may be arranged by
the side of the slide valve as shown. The one sided pressure which the fluid
exerts on the slide valve B when the latter protrudes more or less into the
cylinder H is partly counter-balanced by the pull or pressure which the piston D
exerts thereon during its motion. But this one sided pressure may be fully
obviated by a slit or passage a of suitable size in the front side of the slide valve.
The space L above the slide valve B communicates with the pressure space in the
cylinder H by these passages a and an upper port a' through the slide valve B
whereby the pressure fluid acts on the slide during its down stroke and the
collective pressure on the piston D is increased. There cannot be any counter
pressure during the up stroke of the slide valve because the influx of pressure
fluid meanwhile ceases and that part of the pressure fluid which is contained in
the space above the slide valve B will flow into the pressure space in the
cylinder H and there impart its pressure to the piston D. The two cranks are
at 180° to each other in order that the power exerted in one may be at about its
maximum while it is at its minimum in the other. The pressure fluid may in
various ways be let into the acting space behind the piston D and slide valve B..
It may as shown pass from the inlet J through an oscillating hollow cylinder
valve C, a port I and corresponding port 6 in the slide valve B into a hollow space
within the latter and into a hollow space within the joint piece P. The hollow
cylinder valve C forms a sort of slide valve which opens and closes for the steam
admission to the cylinder H. It may obtain its motion as shown in Figure 1 by a
crank or lever S which by an eccentric rod T is oscillated from an eccentric Q on
the engine shaft F. The bottom of the slide valve B fits around the aforesaid
cylindrical joint piece P on the side of the piston D and is jointed thereto by
two pins P¹ which have rods that reach up through the slide valve B and with
their pins or heads are inserted sideways into the cylindrical joint piece so that
the heads are concentric therewith. These joints may however be constructed
in many other ways. The joint piece P is hollow and has an upper port and a
.

page_text: lateral port which communicate with the interior of the hollow slide valve B when
the piston D in question is at its highest point and remain in communication until
the piston is about passing its lowest position. As the eccentric Q can be shifted
on the shaft F for causing the slide valve to open for the pressure fluid at a more
or less early stage before the slide valve begins to communicate with the hollow
joint piece P while the oscillating inlet valve C always lets the pressure fluid pass
through during the same arc of revolution of the shaft F independently of the
position of the eccentric on the shaft, the expansion or cut off may be regulated by
shifting the eccentric on the shaft.
Instead of admitting the pressure fluid by the hollow joint piece P it may be
let into the acting space of the cylinder by the side of the slide valve B by letting
the port I have its exit at this place. The variable expansion may then be
effected as before if another oscillating cylinder valve, like C, is applied which is
worked from a separate eccentric on the shaft F by eccentric rod and lever.
By arranging the exhaust ports like the inlet passages and by application of
means.for, at will, admitting the fluid through either of the two sets of passages
while the other set is loosed for exhaust the engine may be used for rotating in one
direction or the other for reversing, the slide valves being then of course by suitable
means prevented from shutting off that set of passages which is momentarilly used
for exhaust. The cylinder H may be cast with a hollow space or belt or jacket for
the exhaust steam to pass through it.
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 is,
1. A rotary motor having a piston mounted concentrically on its crank or crank
pin and jointed to a slide valve which is traversed by the motor fluid and the
motion of which is utilised for mechanical work substantially as set forth.
2. A rotary motor having a piston D mounted concentrically on the crank E
and connected by a joint piece P to a hollow slide valve B having through
passages a a' for the motor fluid to pass from one end of the slide valve to the
other all constructed and operating substantially as described and shown.
11000