Improvements in and connected with Rotary Engines and Pumps
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
"Improvements in and connected with Rotary Engines and Pumps."
1, EUSTACE FITZMAURICE PIERS Bart: of 21 Lime Street in the City of London,
Mechanical Engineer Do hereby declare the nature of this Invention to be as
follows.
My Invention relates to rotary engines or pumps intended more particularly
for use in combination with oil or gas engines or other suitable prime motor for
driving tram cars and like vehicles such for instance as described in the Specifi-
cation of Letters Patent No. 10452 of 1894 and has for its object to provide
improved means whereby the starting and stopping and the regulation of the
speed of the vehicle can be readily effected.
According to my present invention the rotary pump comprises a cylinder within
which is carried in bearings in the ends of the said cylinder a shaft having
mounted thereon a number of circular discs closely fitting the interior of the
cylinder. These discs are separated one from another by an eccentric disc the
major axis of which is equal to the radius of the cylinder. Projecting from the
side of the cylinder are chambers or recesses in number corresponding to the
number of eccentrics mounted on the shaft and in each chamber or recess is
fitted to slide a piston or plunger acted on by a spring or preferably by fluid
pressure to keep it in contact with the periphery of the eccentric.
When used as
a pump fluid is supplied to the cylinder through passages arranged on one side of
each of the chambers in which the pistons or plungers work similar openings being
provided at the opposite sides of the said chambers for the escape of the fluid
under pressure from the cylinder.
The shaft carrying the disc may be driven from a gas or oil engine or other
suitable prime motor and as the shaft rotates the fluid is drawn into the cylinder
one one side of the pistons or plungers and occupies the spaces between each two
concentric discs, the eccentric discs as they rotate driving the fluid under pressure
from the cylinder through the openings at the opposite sides of the pistons or
plunger. and the said fluid under pressure may be conducted to a secondary engine
for imparting motion to the wheels of a tram car or other vehicle, or be otherwise
employed. The secondary engine may be a rotary engine similar in construction
to the pump hereinbefore described but preferably with only two eccentrics on the
shaft. The fluid from the rotary pump is conducted to the secondary engine so as
to impart rotation thereto, the admission of fluid under pressure to the said engine
being regulated by valves in connection with each compartment in which the
eccentrics of the pump work so that the fluid may be caused to flow either to the
secondary engine or be conducted back to the tank from which the pump is supplied
any desired number of the said eccentrics being made to operate to vary as required
the speed and power of the secondary engine so that as the quantity of fluid supplied
to the said secondary engine is decreased, the force of the fluid is inversely
increased. To reverse the direction of motion of the secondary engine there is pro-
vided in the passage through which the fluid enters the engine a valve by means of

page_text: which the admission and exit for the fluid, may be reversed. When the secondary
engine is reversed and when fluid is employed to keep the pistons or plunger in
contact with the eccentric discs a valve or valves is or are provided in each chamber
in which the piston or plunger works by means of which valve or valves the inlet
and outlet passages for the fluid to and from the said chambers is reversed. The
speed of the tram car or other vehicle to which my invention is applied may be
varied according to the number of excentrics in the pump operating to supply fluid
under pressure to the secondary engine. To stop the secondary engine and con-
sequently the vehicle the whole of the eccentrics in the pump may be caused to
return the fluid admitted to the pump cylinder back to the tank from which it is
supplied. Instead of making the concentric discs and the eccentric discs separate
and mounting them on a shaft; the whole of the said discs may be cast or otherwise
formed as one piece and be keyed onto the shaft on the casting or the casting may
be formed with pivots or journals to work in bearings in the cylinder ends.
Dated this 4th day of January 1897.
JOHNSONS & WILLCOX
47 Lincolns Inn Fields London WC Agents.
66
Improvements in and connected with Rotary Engines and Pumps.
"
I, EUSTACE FITZMAURICE PIERS, Bart. of 21 Lime Street in the City of London,
Mechanical Engineer, 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:-
My Invention relates to rotary engines or pumps intended more particularly for
use in combination with oil or gas engines or other suitable prime motor for driving
tram cars and like vehicles such for instance as described in the Specification of
Letters Patent No. 10452 of 1894 and has for its object to provide improved means
_ whereby, the starting and stopping and the regulation of the speed of the vehicle
can be readily effected.
:
According to my present invention which I will describe with reference to the
accompanying drawings of which Figure 1 is a longitudinal vertical
section. Figure 2. a horizontal section and Figure 3 a transverse vertical
section of a pump constructed according to my invention. The said
pump comprises a cylinder A within which is fitted to rotate a number of
circular discs B closely fitting the interior of the cylinder and separated
one from another by eccentric discs C C C the major radius of each of which
eccentrics is equal to the radius of the cylinder A. The discs B and C C₁₂ are
preferably formed in one piece or they may be connected together so as to con-
stitute one piece and are keyed on a shaft I fitted to turn in stuffing boxes E in
the ends or cheeks of the cylinder A, and driven by any suitable means from a gas
engine or other suitable prime motor carried on the tram car or other vehicle to be
driven. Projecting from the periphery of the cylinder A are chambers or
recesses F F 3 in number corresponding to the number of eccentric discs mounted
on the shaft D) and in each chamber or recess is fitted to slide a piston or plunger G
G¹ G2 acted on by springs or preferably by fluid pressure entering the chambers F
FF by passages a to keep the said plungers in contact with the periphery of the
said eccentric C C¹ C³.
When used as a pump, fluid is supplied to the cylinder A through passages H
and chamber I arranged on one side of the chambers F F F in which the pistons

page_text: or plungers G G1 G2 work, openings or passages K K' K2 being provided at the
opposite side of the said chambers F F F for the escape of the fluid under pressure,
from the cylinder A. .
The shaft D carrying the discs B. C C C may be driven by means of any suitable
gearing from a gas or oil engine or other suitable prime motor (not shewn in the
drawing) By the rotation of these discs water is drawn through the passage H
into the cylinder A and forced therefrom by the said disc from the cylinder through
the passages K K K into a chamber L from whence it is conducted by a pipe or
passage M on to a water wheel or into the cylinder of a rotary engine N connected
to one of the axles of the vehicle to be driven. This secondary engine may be con-
structed like the pump hereinbefore described but is preferably provided with only
two eccentric discs. The pressure of fluid passing from the pump to the secondary
engine N can be regulated as required by means of valves in the passages K
KK by raising any one of which valves the water passing from the pump into
the passage containing the valve will be conducted into the passage Hath back
to the pump and continue to circulate therethrough instead of passing to the
secondary engine. The speed of the tram car or other vehicle to which the inven-
tion is applied may be thus varied by raising one or more of the valves so as to
prevent one or more of the eccentrics in the pump from acting to force fluid into
the secondary engine. By raising all the valves no fluid will pass from the
pump into the secondary engine N and consequently no motion will be imparted
to the vehicle the fluid simply circulating through and through the pump so long
as the valves are elevated and the primary motor is at work. The concentric
discs B and the eccentrics C, C1, C2 may be made separately and be suitably
adjusted in position and connected together by any suitable means, but I prefer
to form the said discs all in one piece by casting and turning, or otherwise, so that
the relative positions of the said dises will not require to be adjusted.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. For driving tram cars and other vehicles the combination with a gas or oil
engine or other prime motor of a rotary pump operated by the said primary motor,
the said pump comprising a cylinder in which a combination of concentric discs
and eccentric discs are rotated, plungers sliding in chambers on the periphery of
the cylinder and caused to bear by fluid pressure or other means on the peripheries
of the eccentric discs; passages on opposite sides of the plungers for the admission
of fluid to the cylinder and exit of fluid from the cylinder; and a rotary engine in
connection with one of the axles of the vehicle to be driven, the said rotary engine
being driven by fluid pressure forced thereinto by the pump substantially as
hereinbefore described.
2. A rotary pump or engine comprising a cylinder containing concentric discs
and eccentric discs formed in one integral piece, or in parts connected together;
plungers acted on by springs or fluid pressure so as to bear on the peripheries of
the eccentric discs; and inlet and outlet passages for fluid arranged on opposite
sides of the plungers, substantially as hereinbefore described.
T
1
1007
JOHNSONS & WILLCOX
47 Lincolns Inn Fields London W.C. Agents for the applicant.