A NA TYPOWER ROTATORY THAT
Year: 1875

page_text: LETTERS PATENT to Edward Kaulbach, of 21, Gower Street, Bedford
Square, in the County of Middlesex, Gentleman, for the Invention
of 66 A NA TYPOWER ROTATORY THAT "
Sealed the 10th August 1875, and dated the 15th February 1875.
PROVISIONAL SPECIFICATION left by the said Edward Kaulbach at
the Office of the Commissioners of Patents, with his Petition, on
the 15th February 1875.
I, EDWARD KAULBACH, of 21, Gower Street, Bedford Square, in the
County of Middlesex, Gentleman, do hereby declare the nature of the
said Invention for "A NEW AND IMPROVED ROTATORY ENGINE," to be as
follows:
The principle on which this engine is based is the same as that
described in my Specification, numbered 1983, and dated 19th June
1868, namely, the application of the power to the periphery of a wheel;
the method whereby this principle is carried into practice however has
been subjected to the following modifications and improvements :—
1º. The steam cavity is formed by a groove cut in the periphery of a

page_text: wheel, which fits steam tight, and rotates within a cylinder, this latter
being a fixture. The steam cavity aforesaid is divided into two or more
equal compartments by means of walls, which serve the purpose of an
ordinary piston.
2°. The cams or "shoulders " described in the aforesaid Specification,
instead of being movable are now made fixtures, and attached to the
rotating wheel, there being two cams for each wall or piston. The
shape of the said cams is the epicycloidal curve, the diameter of whose
generating circle is equal to the depth of the aforesaid steam cavity.
3°. At each of two diametrically opposite points of the circumference
of the rotating wheel, and in a horizontal plane passing through its
centre, is a slide valve whose vertical section in form and size is equal
to the steam cavity so as to fit it exactly. This slide valve is attached
to the outer cylinder, and has two steam passages opening in opposite
directions, and which serve alternately for supply and exhaust. Beneath
this valve and working at right angles to it is another slide valve, whose
office is merely to reverse the engine, and below which is placed the
steam chest.
I have several methods of imparting the necessary action to the
aforesaid upper slide valves, but the two which I prefer are as
follows:-
:-
1°. At the rear of the slide valve is a piston working in a small
cylinder. The rod of the piston has a cross head with two arms
terminating with friction rollers which run upon the aforesaid cams.
When the cams come into contact with these rollers the slide valve is
driven from the steam cavity of the wheel into the outer cylinder so as
to allow the walls or pistons aforesaid to pass; but this action opens a
valve which allows the steam instantly to enter the small cylinder
above the piston, and drive the slide valve back to its position in the
wheel.
2°. By the second method I dispense altogether with cams and friction
rollers, and work the slide valves by means of two small cylinders with
pistons actuated by steam in the usual manner.
In working the above engine I do not confine myself to the use of
steam, as other fluids can likewise be made available as motive power.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Edward Kaulbach in the Great Seal Patent Office
on the 14th August 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, EDWARD
KAULBACH, of 21, Gower Street, Bedford Square, in the County of
Middlesex, Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixteenth day of February, in the year
of our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors, give
and grant unto me, the said Edward Kaulbach, Her special. licence
that I, the said Edward Kaulbach, my executors, administrators, and
assigns, or such others as I, the said Edward Kaulbach, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "A NEW AND
IMPROVED ROTARY ENGINE," upon the condition (amongst others) that
I, the said Edward Kaulbach, my executors or administrators, by
an instrument in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office" within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Edward Kaulbach, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement:-
The principle on which this engine is based is the same as that
described in my Specification, numbered 1983, and dated 19th of June
1868. The method however of carrying the said principle into practice
is entirely different.
The steam cavity is formed by a groove, the sectional shape and
dimensions of which are optional, cut in the periphery of a wheel which

page_text: "
I
fits steam-tight, and rotates within a cylinder, this latter being a fixture,
see Fig. 1. The steam cavity aforesaid is divided into two or more equal
steam-tight compartments by means of walls or partitions, which serve
the purpose of an ordinary piston. Each of the said walls has two cams,
which
occupy a corresponding position on either side of the rotating
wheel, to which they are attached externally.
The shape of the said cams is the epicycloidal curve, the diameter of
whose generating circle is equal to the depth of the steam cavity, and
their width at the summit rather greater than that of the slide valves
situated at diametrically opposite points of the circumference of the
rotating wheel, and on a horizontal plane passing through its centre.
The said slide valves are attached to the outer cylinder, through which
they work in and out of the aforesaid steam cavity, which one end fits
'steam-tight, while to the other is fixed a piston working in a small
oylinder. These valves moreover have each two steam passages opening
into the steam cavity in opposite directions, and which serve alternately
for supply or exhaust, according to requirement. Beneath each of the
aforesaid valves, and working at right angles to them, is another slide
valve, which is brought into play only when it is required to reverse the
engine. This valve has ports communicating between the steam chest
that is situated immediately beneath it and those of the aforesaid main
slide valve situated immediately above it.
It will be seen by referring to Fig. 2 that the distribution of the said
ports is such that according as the lower slide valve is pulled forward or
pushed back the ports in the upper slide valve are open for supply and
escape, and vice versa. The two lower slide valves are connected and
worked by a lever.
The steam chest, Figs. 1 and 3, is divided into two compartments, the
one for the supply, the other for the escape. The former is connected
from below with the boiler, and contains an inner steam box likewise
divided into two compartments, into which the steam is admitted from
the outer chamber by means of disc valves worked by a system of
gearing, as shewn in Fig. 1, attached to and put in motion by the arms
of the cross head bearing the friction rollers that run upon the cams, and
which is fixed to the end of the rod of the small piston already alluded
to, see Fig. 1.
When steam is let into the engine through the unner slide valves it

page_text: presses upon the aforesaid walls, and causes the wheels to rotate. When
the cams aforesaid which protect these walls or partitions from coming
into contact with the upper slide valves reach the friction rollers the
slide valves are driven from the steam cavity so as to allow the said
walls to pass; but this action instantly and simultaneously cuts off the
steam from the body of the wheel by closing one of the aforesaid disc
valves of the steam chamber, while by opening the other the steam is
admitted into the small cylinder above the piston so as to drive the said
upper slide valve back to its position in the wheel the moment the wall
has passed, when the steam is again readmitted into the steam cavity of
the rotating wheel, and the operation is repeated as before, and so on.
It must be observed that the steam that enters at one end is driven
out at the other.
There is another method of working the said upper slide valves,
whereby the cams and friction rollers may be dispensed with; it is by
placing two small horizontal cylinders in the position here occupied by
the single small cylinder, and connecting the valve rod with an eccentric
attached to a small shaft actuated by the said little cylinders, the eccen-
tricity being equal to half the depth of the steam cavity.
In working the above engine I do not confine myself to the use of
steam, as other fluids can likewise be made available as motive powers.
What I claim as my own is, the mode of obtaining the point d'appui
by the mechanical arrangements herein-before described for applying
power to the periphery of a wheel to produce continuous rotatory
motion.
In witness whereof, I, the said Edward Kaulbach, have hereunto