Improvements in Hydraulie Pumps.
Year: 1898

page_text: Improvements in Hydraulie Pumps.
I, THOMAS KENNEDY, of 7, Howard Street, Kilmarnock, in the County of Ayr,
North Britain, Hydraulic Engineer, do hereby declare the nature of this inven-
tion to be as follows, that is to say:-
My said invention has for its object to improve the construction of hydraulic
pumps and to render them more efficient and economical and less liable to get out
of order.
My improvements are applicable to a triple arrangement of motor cylinders and
pumps connected to a three-throw rotating crank shaft. The pump rams and
motor rams are combinations of or fixed to each other, being provided with
slippers working on guides between the motor and pump cylinders. Rods fixed
to the motor rams extend through stuffing boxes to crossheads which are con-
nected to the crank shaft, the middle one being connected to a bent or double-
cheeked crank and the others to crank pins in disks on the ends of the shaft.
Each crosshead has fixed to it two rams working in small cylinders one on each
side of each motor cylinder, the small rams being acted on by the pressure water
oppositely to the motor rams so as to more or less balance the rising column of
water. Each motor cylinder is provided with a separate admission valve and
with a separate exhaust valve. Each valve is of the conical-seated disk kind and
is fixed on a spindle both ends of which work through stuffing boxes. One end of
each valve spindle is of larger area than the other, so that the internal pressure
tends to close the valve; and each valve is opened at the proper times by a cam
acting on an antifriction roller fitted to the end of the valve spindle, the valve
closing automatically after each action of the cam. The cams for the several
valves are on a shaft driven by bevil gearing at the same speed as the crank
shaft. The suction and delivery valves of the pumps may be of any suitable
known kind.
Dated this Second day of November 1898
EDMUND HUNT,
Applicant's Agent.
I, THOMAS KENNEDY, of 7, Howard Street, Kilmarnock, in the County of Ayr,
North Britain, Hydraulic Engineer, do hereby declare the nature of this inven-
[Price 8d.]

page_text: tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement, that is to say: -
My said invention has for its object to improve the construction of hydraulic
pumps and to render them more efficient and economical and less liable to get out
of order.
And in order that my said invention and the manner of performing the same
may be properly understood, I hereunto append two sheets of explanatory draw-
ings to be hereinafter referred to in describing my improvements.
Figure, 1, on Sheet, 1, of the drawings is a plan, and Figure, 2, is a side
elevation of hydraulic pumps as constructed with my improvements. Figures, 3,
and 4, on Sheet, 2, are longitudinal vertical sections on an enlarged scale of some
of the improved parts. In these drawings the same reference letters and numerals
are used to mark the same or like parts wherever they are repeated.
My improvements as shown in Figures, 1, and 2, are applicable to a triple
arrangement of motor cylinders and pumps connected to a three-throw rotating
crank shaft. The pump rams, A, and motor or power rams, B, are as shown, con-
tinuations of each other, or they may be made separately and suitably fixed. to
each other. They are provided with supporting slippers, C, working on
guides, C1, between the motor and pump cylinders, D, and E. Rods, B1, B2, B3,
fixed to the motor rams, B, extend through stuffing boxes, G, and are fixed to
crossheads, H1, H2, H3, which are connected to the crank shaft, J, by connecting
rods, J1, J2, J3, the middle crosshead, H 2, being connected to a bent or double-
cheeked crank, J4, and the others, H1, H3, to crank pins, J 5, JG, fixed to
disks, J. 7, J 8, on the ends of the crank shaft. Each crosshead has fixed to it two
rams K1, K2, working in small cylinders, K 3, K4, one on each side of each
motor or power cylinder, D. The small cylinders, K3, K4, are connected to the
main pressure supply pipe, L, by branch pipes, K 5, K 6, and the small auxiliary
rams are acted on by the pressure water oppositely to the motor rams, B, so as to
more or less balance or counteract the pressure of the rising column of exhaust
water leaving the motor cylinders by the exhaust pipe, L1. Each motor
cylinder, D, is provided with a separate admission valve, M, and with a separate
exhaust valve, N shown on an enlarged scale in Figures, 3, and 4. The valves
are of the conical-seated disk kind and are formed or fixed on spindles, M 1, N 1,
working through stuffing boxes, M2, N2, at each end of the valve
casings, M 3, N3. One part, M 4, N4, of each valve spindle is made smaller than
the other parts within each valve box, M3, N3, so that the resultant internal
pressure acting on each valve will always tend to close it and keep it on its seat.
Each valve, M, and N, is opened at the proper times by a cam, P1, P2, each
cam acting on an antifriction roller, P3, fitted to the forked end of a piece, P4,
into which the end of the valve spindle is screwed the forked piece being suit-
ably guided by guide brackets, 15, fixed to the framing. The valve closes
automatically after each positive or opening action of the cam, and each valve
may be conveniently adjusted when desired by screwing the spindle farther into
or out of the forked piece, P4, by means of a key applied to the squared end
of the spindle. The cams, P1, P2, for operating the several valves, M, N, of
each motor or power cylinder, D, are adjustably fixed to an intermediate shaft, Q,
driven by bevil gearing, Q1, from the crank shaft, J, and so as to rotate at the
same speed as the crank shaft. Or if preferred the intermediate shaft may be
dispensed with and the cams fixed to the crank shaft direct. The suction and
delivery valves, R, S, of the pumps, E, may be of any suitable known kind.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. The combination and arrangement of parts constituting my improvements
in hydraulic pumps, substantially as and for the purposes hereinbefore described,
with reference to the accompanying drawings.

page_text: 2. In hydraulic pumps, providing in connection with each motor or power ram,
small auxiliary rams, connected to the motor ram crosshead, having the pressure
water constantly acting on them in a direction opposite to that in which it acts
on the motor ram, substantially as and for the purposes herein before described
with reference to the accompanying drawings.
3. In hydraulic pumps, providing a separate admission valve, and a separate
exhaust valve, for each motor or power cylinder, each valve being opened at
the proper times by a cam acting on an antifriction roller fitted to the end of the
valve spindle, the valve closing automatically after each action of the cam; the
cams for the several valves being adjustably fixed to a shaft driven by bevil gear-
ing from the crank shaft, or fixed to the crank shaft direct substantially as and
for the purposes hereinbefore described with reference to the accompanying
drawings.
3
T
EDMUND HUNT,
Applicant's Agent.