CERTAIN IMPROVEMENTS IN ROTARY PUMPS AND 'ROTARY STEAM ENGINES
Year: 1843

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, NICOLAS
HENRI JEAN FRANCOIS Comte DE CROUY, of the Edgeware Road, in the County
of Middlesex, send greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of Great Britain; bearing date at
Westminster, the Twenty-fifth day of March, in the sixth year of Her reign, did,
for Herself, Her heirs and successors, give and grant unto me, the said Nicolas.
Henri Jean Francois Comte de Crouy, Her especial licence, full power, sole
privilege and authority; that I, the said. Nicolas Henri Jean Francois Comte
de Crouy, my executors, administrators, 'and assigns, and such others' as I; the
said Nicolas Henri Jean Francois Comte de Crouy, my executors, administra-
tors, or assigns, should at any time agree with, and no others; from time to time
and at all times during the term of years therein mentioned, 'should and law-
fully might make, use, exercise, and vend, within England, Wales, the Town
of Berwick-upon-Tweed, in all Her Majesty's Colonies and Plantations abroad,
and in the Islands of Jersey, Guernsey, Alderney, Sark, and Man, my Inven-
tion of "CERTAIN IMPROVEMENTS IN ROTARY PUMPS AND 'ROTARY STEAM ENGINES;"
in which said Letters Patent is contained a proviso obliging me the said Nicolas
Henri Jean Francois Comte de Crouy, by an instrument in writing under my
hand and seal, particularly to describe and ascertain the nature of my said
Invention, and in what manner the same is to be performed, and to cause the
same to be inrolled in Her Majesty's High Court of Chancery within six
calendar months next and immediately after the date of the said in part
recited Letters Patent, as in and by the same, reference being thereunto bad,
will more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, 1, the said
Nicolas Henri Jean Francois Comte de Crouy, do hereby declare that the
nature of my said Invention, and the manner in which the same is to be per-
formed, are particularly described and ascertained in and by the following
description thereof, reference being, had.. to.. the. Drawing hereunto annexed,
and to the Letters and figures marked thereon (that.is to say) :-
-
My Invention of improvements" in rotary pumps and rotary steam engines
consists principally in the employment of a revolving piston of a peculiar form.
The same form of revolving piston is employed both in the pump for raising
water, and also for a rotary engine to be worked by steam.
:
In the accompanying Drawing, Figures 1 and 2 represent my improvements
as applied to a rotary pump and a rotary steam engine, Fig. 1 being a vertical
section taken through the centre of a pump, and Fig. 2 a similar section
through a steam engine.
a, a, Fig. 1, is the outer case or cylinder of the pump, the ends of which
are closed by cap plates in the ordinary way; and 6, 6, is the peculiar formed
revolving piston, to the axle of which a moving power must be applied when
employed for raising water or other liquids. The water or other liquid entres
the cylinder by the pipe c, and is discharged therefrom by the pipe d on the
.opposite side. Between these two pipes is placed a moveable stop e, which is
always kept in contact with the revolving piston by means of a spiral spring f
contained in the box or chamber above. As this box is held in its place merely
by means of screws, as seen in the Drawing, it may be easily detached from
the pump, without interfering with any other part of the apparatus, should it
be found necessary, from the derangement of the spring or any other cause, to
. do so. In the steam engine, as seen in Fig. 2, the extremities b, c, and d of
the revolving piston are rather more pointed than in the other figure, and the
: steam stops e and f are constructed and worked in a different manner. The
quiescent position of the steam stops is that represented at e, but when steam is
admitted into the cylinder by the passages g, one of the said stops is forced back
"into the situation shown at f, the lower end being by the steam pressed tightly
against the revolving piston. The expansive force of the steam acting against
that portion of the piston which has passed the steam stop will cause the
piston to revolve in the direction of the arrows, the steam stop gradually closing
into its seat; and when the point b of the piston has passed the exit aperture
h, that volume of steam will instantly rush out of the cylinder, either into the
atmosphere or into a condenser. The point c of the piston having passed the
steam stop f, laying quiescent in its recess, and which has thereby closed the
aperture g, and the point d having passed the steam stop e, the steam will im

page_text: mediately enter the cylinder by the passage i, and drive back the lower stop e
against the revolving piston, which is now made to pass through the other
part of its rotation, and when that volume of the steam has fulfilled its office
it escapes as before through the exit aperture j. The steam stops, one of
which is shewn detached at Fig. 3, are mounted upon hinge joints, which are
also furnished with strong convolute springs, for the purpose of keeping the
said stops back in their recesses, when not acted upon by the pressure of the
steam. If the engine is required to reverse the direction of its rotation it will
be necessary to have another set of stops, as well as additional supply and
exit passages, and when the revolving piston is working in the contrary direc-
tion the supply of steam must be cut off from the passages 9 and i, and the
additional steam stops made to collapse in the opposite direction to those above
described. The springs on the hinge joints of the steam stops g and i will be
sufficiently strong to hold the stops back in their recesses.
Having now described my Invention, and the manner of carrying the same
into effect, I claim as the Invention secured to me by the herein-before in part
recited Letters Patent, first, the general construction of the pump and engine
as above shown and described, and, secondly, the peculiar form of revolving or
rotary piston.
In witness whereof, I, the said Nicolas Henri Jean Francois Comte De
Crouy, have hereunto set my hand and seal, the Fifteenth day of
September, One thousand eight hundred and forty-three.
Inrolled the Twenty-fifth day of September, One thousand eight hundred
and forty-two.