IMPROVEMENTS IN ROTARY PUMPS AND ENGINES
Year: 1875

page_text: LETTERS PATENT to Robert Patrick, the younger, of the Village of
Branchton, in the County of Waterloo, in the Province of Ontario,
Canada, for the Invention of "IMPROVEMENTS IN ROTARY PUMPS AND
ENGINES
"
COMPLETE SPECIFICATION filed by the said Robert Patrick at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 12th July 1875, pursuant to the 9th Section of
the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ROBERT
PATRICK, the younger, of the Village of Branchton, in the County of
Waterloo, in the Province of Ontario, Canada, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN ROTARY PUMPS AND ENGINES," and have petitioned Her Majesty to grant
unto me, my executors, administrators, and assigns, Her Royal Letters
Patent for the same, and have made solemn Declaration that I am
the first and true Inventor thereof.

page_text: NOW KNOW YE, that I, the said Robert Patrick, the younger, do
hereby declare that the following Complete Specification, under my hand
and seal, fully describes and ascertains the nature of the said In-
vention, and in what manner the same is to be performed, in and by
the following statement, reference being had to the Drawings hereunto
annexed and to the letters and figures marked thereon (that is to say) :-
This Invention has relation more particularly to improvements in that
class of rotary pumps and engines in which a single cylinder or dise
revolves within a cylindrical chamber, and it consists of a cylinder or
disc of suitable dimensions mounted on a revolving shaft, and provided
with a number of sliding blades placed parallel with its axis, which blades
acting in combination with certain peculiarly placed cams projecting
from the inner faces of the sides of the disc encasement produce as the
disc revolves a perfect or partial vacuum in the chambers or cells
between the blades. Into these chambers the fluid or gas to be pumped
is forced by a well known law of nature through suitably arranged
passages, and as the disc revolves the gas or fluid is forced forward by
the blades, and discharged through other passages in a continuous stream
with great force.
In the accompanying Drawings Fig. 1 is a side view; Fig. 2 is a cross
section; Fig. 3, an end view; Fig. 5, a longitudinal section; and
Fig. 6, a sectional plan of a pump or engine constructed according to
this Invention.
Fig. 4 is a perspective view of the revolving disc shewing the blades.
A is the revolving shaft driven in any suitable manner, to which is
fastoned the flanged disc or cylinder B; C is the hollow cylinder within
which the disc B revolves, the shaft A passing through the centre being
supported on flanged bearings C₁ provided with stuffing boxes. The
sides C³ of the cylinder O are made detachable, and are connected
together to form the chamber by a cylindrical cross piece O³. An
inwardly projecting cam D is cast on the face of each of the side
plates O in such manner and in such position with relation to cach
other that they form when the sides are bolted together an inflected
passage X, in the centre of which the flanged disc B revolves. The disc
is provided with four blades E placed radially and longitudinally with
its axis, which blades are in width equal to the width of the inflected
channel between the side plates C. The blades E slide freely in slots

page_text: cut in the disc, and as the shaft revolves have communicated to them in
addition to their revolving motion an alternating motion equal in stroko
to the inflection of the before-mentioned passage. F, F, are ports which
admit the fluid or gas; G, G, are the discharge ports. The outside
mouth of both inlet and discharge ports are flanged or otherwise arranged
to connect with the leading and discharge pipes. The cams D, D, decline
from the centre in both directions, feathering off to the face of tho
plates C, C, the inlet and discharge ports being placed at opposito ends
of the cam, and alternately in relation to each other. The feather edge
of the cam on one side plate slightly overlaps the edge of the cam on
the opposite plate, thus forming a continuous easily turned passage for
the blades: An inlet and outlet port is provided on each of the side
plates, that is, the pump has two inlet and two outlet ports, the inlet
port on one plate being placed opposite to the outlet port on the opposite
side plate, and vice versa; thus the pump is made double acting, as
while a blade is taking its load on one side of the disc it is discharging
on the other side. The two discharge ports may be connected together
or preserved distinct from each other, as desired.
The construction of the pump is such that it is reversible, working
equally well in either direction.
The parts of this Invention having been thus illustrated its operation
may be briefly described as follows:-The shaft being set in motion tho
fluid or gas is admitted by the ports F, F, (the quantity admitted being
regulated by valve in the usual way). Each blade of the system as it
passes the inlet ports in its revolution takes with it a certain quantity of
fluid (sufficient in theory to fill the chamber between it and the previous
blade), and carries it forward until it reaches the discharge port, where
the direction of the passage X changes, causing the blade to recede, and
forcing the fluid out through the discharge port with a velocity in
O proportion to the speed of the shaft. The substance to be pumped is
fed into the pump after each passage of a blade by that law of nature
which forces matter (under the usual conditions) to fill up the vacuum
thus caused.
Although the machine is peculiarly adapted for pumping fluids it is
3 not to be understood that the claim is confined or limited to this work
nly, as the pump will handle gases in the same manner as liquids. It
is also adapted to be used as an air blower for furnaces etc., and it can
further be used as a rotary steam engine for furnishing motive power.

page_text: What is claimed in this Invention is, the flanged disc or cylinder B,
mounted on the revolving shaft A, and provided with the radially placed
sliding blades E in combination with the side plates C provided with the
inwardly projecting alternately arranged cams D, inlet ports F, F, and
discharge ports G, G, arranged and operating substantially as and in the 5
manner set forth.
In witness whereof, I, tho said Robert Patrick, the younger, have
hereunto set my hand and seal, tho Twenty-second day of June,
in tho year of our Lord One thousand eight hundred and seventy-
five.