A NEW AND IMPROVED ROTATORY. ENGINE
Year: 1874

page_text: PROVISIONAL SPECIFICATION left by Edward Kaulbach at the Office
of the Commissioners of Patents, with his Petition, on the 9th
July 1874.
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 practise however
has been subjected to the following improvements :—
1°. Around the periphery of a metal wheel I cut a groove which
serves as steam cavity, this wheel fits steam-tight and rotates within an
outer circle or cylinder which is a fixture, and to which the two "blocks
or fulcra" described in the aforesaid Specification are fixed, thus the
circle C, C, in the Drawing accompanying the said Specification is
dispensed with.

page_text: 2°. The cams or "shoulders" described in the aforesaid Specification
may be reduced from eight to five in number, and instead of being
connected by means of articulated parallelograms and moveable as
illustrated in the aforesaid Drawings they are fixtures. Their position
likewise is changed, for instead of being placed respectively on either
side of and above and below the two fixed "blocks or fulcra" described
in the aforesaid Specification they are now situated one on each side of
and in the same horizontal plane as the said "blocks." 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 that encircles
the wheel.
3°. The eight slides or "valves" which I now term pistons, described
in the aforesaid Specification, are likewise reduced in number to four, or
three, or even two at will. The articulated parallelogram, connecting
them (see illustration to aforesaid Specification) are also dispensed
with.
"
4°. The said pistons may be made either moveable or fixtures; if
fixtures then the aforesaid "blocks or fulcra" through which the steam
enters and escapes from the two semicircular steam compartments are
made moveable, and slide out and in as the said pistons approach, and
recede from them or vice versa in the case where the said "blocks or
fulcra" are fixtures and the pistons moveable, but I prefer the former
plan; I have several methods of imparting the necessary action to the
aforesaid blocks or valves and pistons, which will be found described
in detail in my full Specification, but the principal one is by means of the
aforesaid cams upon which run friction rollers attached to the moveable
parts. When the said "blocks are moveable that portion of them that
does not enter the steam cavity fits steam-tight in a cylinder in which
it slides, and within the extrémity of which is confined a strong conical
steel spring which impinging upon the rear of the said slide valve or
block," drives it back to its position within the steam cavity after it
has been momentarily thrust out by the passage of the cams that in this
caso are attached to and rotate with the wheel. In the case where the
aforesaid "blocks" are stationary and the pistons moveable, the cams do
not rotate with the wheel but are fixed to the outer circle or cylinder:
"1
66
"
5°. Each of the aforesaid "blocks" or slide valves has another slide
valve at right angles to and communicating with it. These two
secondary valves are connected and worked by a lever whose fulcrumi

page_text: is in the centre, so that their action is simultaneous and opposite.
The purpose of the secondary valves is to reverse the parts and with
them the engine.
In working the above engine I do not confine myself to the use of
steam only, as other fluids can likewise be made available as motive
power.