IMPROVEMENTS IN PUMPS OR APPARATUS FOR RAISING AND FORCING LIQUIDS
Year: 1883

page_text: PROVISIONAL SPECIFICATION left by Gilbert Murray and Robert Turnley
at the Office of the Commissioners of Patents on the 14th November 1883.
GILBERT MURRAY, of Elvaston in the county of Derby, Land Agent and
ROBERT TURNLEY, of Elvaston in the county of Derby, Mechanic "IMPROVEMENTS
IN PUMPS OR APPARATUS FOR RAISING AND FORCING LIQUIDS
"
This invention has reference to the construction of a pump or apparatus for
raising and forcing liquids and is more especially applicable for purposes where
water or other fluid has to be projected some distance and with more or less
pressure as for example as a fire engine.
We prefer to form the apparatus in three chambers cast separately and suitably
bolted together.
The lower chamber is fitted with a suitable union for connecting it to the hydrant,
well, or other source of supply.
The upper plate of this chamber contains orifices (usually two) through which
work the cylinders or plungers hereinafter described.
The chamber bolted on this is open at the bottom and closed at the top, with the
exception of orifices for the plungers to work in and with seatings formed for the
valves which may be of the clock, cone, ball, or other suitable variety.
This chamber is, however, divided by a diaphragm or partition abutting on the
top plate of the upper chamber.
The plungers or cylinders may be hollow or solid and of wood or other material
not fitting quite tightly, the orifices in the plates before described.
On the upper part of the valve chamber is bolted the air chamber or vessel
having a suitable union for the outlet pipe and fitted with guide cylinders or
stuffing boxes for the rods of the plungers-or-cylinders.
A stuffing box is provided through which passes the spindle of a rocking beam
linked or jointed to the said plunger rods.
To work the apparatus the said rocking beam is operated causing each plunger to
be alternately raised drawing the water or other fluid into the valve chamber. The
downward stroke forces it into the air chamber. The alternate upward stroke of
each cylinder or plunger compresses the air in the air chamber so that as the water
from the downward stroke of one plunger passes into the air vessel through the

page_text: aforesaid valve the other plunger rising in the air chamber compresses the air in the
same thus driving the water through the outlet pipe.
To regulate the velocity of the issuing jet we connect the opposite sides of the
valve chamber divided by the diaphragm or plate before described by a pipe or duct
passing from one to the other and fitted with a central valve or stop cock.
If this is closed the jet issues with the greatest velocity as both sides of the
valve chamber are independent of each other but if the cock be opened more or less
a communication is made between the two sides of the valve chamber equalizing
and reducing (or increasing) the pressure therin more (or less) as the valve or cock
is proportionately opened (or closed).
E
This arrangement is principally applicable when the apparatus is used for
raising water with a small forcing power which is effected by fully opening
the cock.
Instead of the rocking beam passing through the sides of the air chamber the
rods of the plungers may pass through stuffing boxes at the top and may be
connected to the beam working outside the chambers.
Or for a steam fire engine the piston rod of the steam cylinders may be coupled
to or form one piece with the plunger rods.
If desired tail rods may be used to steady the plungers and pass through stuffing
boxes in the bottom chamber.
.
A syphon pipe can be added to each suction pipe to act as a counterpoise the
syphon pipe being connected to an airtight chamber at the bottom of the well and
the syphon drawing water from the well and delivering into the pump chamber
before described.