IMPROVEMENTS CONNECTED WITH FEED AND AIR PUMPS TO BE USED SEPARATELY OR COMBINED.” PROVISIONAL SPECIFICATION
Year: 1880

page_text: LETTERS PATENT to Francis Charles Simpson and Joseph Basil Denison, of
Dartmouth, in the County of Devon, Engineers, for an Invention of
"IMPROVEMENTS CONNECTED WITH FEED AND AIR PUMPS TO BE USED
SEPARATELY OR COMBINED.”
PROVISIONAL SPECIFICATION left by the said Francis Charles Simpson
& Joseph Basil Denison at the Office of the Commissioners of Patents on
the 27th August 1880.
FRANCIS CHARLES SIMPSON and JOSEPH BASIL DENISON, of Dartmouth, in the
County of Devon, Engineers. "IMPROVEMENTS CONNECTED WITH FEED AND AIR
PUMPS TO BE USED SEPARATELY OR COMBINED."
Our Invention chiefly relates to valves for feed and air pumps, and are applicable
to all feed and air pumps, but is specially adapted to small marine surface con-
densing engines where the pumps are required to run at a speed of three or four
hundred revolutions per minute, which are at prosent much impeded in their action
by the effects of the grease from the condensor.
vacuum.
We purpose using metal valves in the air pump to obviate the many incon-
veniences which arise from the use of india rubber valves, and to secure a better
The bottom valve in our feed pump is formed with a long spindle which
is made a working fit in a hole bored in the pump plunger, which spindle becoming
coated with grease, causes sufficient friction to lift the valve at the commencement
of the up stroke of the plunger, keeping it open during the stroke, thereby leaving
a free passage for the water, and to close it at the commencement of the down
stroke, thereby compelling the water in the pump barrel to pass through the top
valve.
The bottom valve in our air pump is made in the piston, which is allowed a small
amount of vertical motion on the piston rod, and is so arranged that on the down
stroke the friction of the packing against the bore of the pump raises it, thereby
leaving a free passage through the valve, and on the up stroke presses it down and
so closes the passage, thereby compelling the contents of the pump barrel to pass
through the top valve, which is also constructed of metal, and closed by the action
of a spring on the top or otherwise.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Francis Charles Simpson & Joseph Basil Denison in the Great Seal
Patent Office on the 26th February 1881.
FRANCIS CHARLES SIMPSON and JOSEPH BASIL DENISON, of Dartmouth, in the
County of Devon, Engineers. "IMPROVEMENTS CONNECTED WITH FEED AND AIR
PUMPS TO BE USED SEPARATELY OR COMBINED."
Our Invention chiefly relates to valves for feed and air pumps, and are applicable
to all feed and air pumps, but is especially adapted to small marine surface con-
densing engines where the pumps are required to run at a speed of three or four
hundred revolutions per minute, which at present are much impeded in their action
by the effects of the grease from the condenser.
We purpose using a metal valve in the air pump to obviate the many incon-
veniences which arise from the use of india rubber valves, and to secure a better
vacuum. The bottom valve in our feed pump is formed with a long spindle which
is made a working fit in a hole bored in the pump plunger, which spindle becoming
coated with grease, causes sufficient friction to lift the valve at the commencement
of the up stroke of the plunger, and keeping it open during the stroke, thereby
leaving a free passage for the water, and to close it at the commencement of the
down stroke, thereby compelling the water in the pump barrel to pass through the
top valve.
.
The bottom valve in our air pump is made in the piston, which is allowed a small
amount of vertical motion on the piston rod, and is so arranged that on the down
stroke the friction of the packing against the bore of the pump raises it, thereby
leaving a free passage through the valve, and on the up stroke presses it down and
so closes the passage, thereby compelling the contents of the pump barrel to pass
through the top valve, which is also constructed of metal, and closed by the action
of a spring on the top or otherwise.
The annexed Drawings represent our Invention and the arrangement of the
details thereof in the manner we prefer to employ them.
Figure 1 is a part sectional view of a feed pump, and Figure 2 a part sectional
view of an air pump. A is the barrel of the air pump, and B is the plunger or
piston. This piston carries a valve C upon its stem in such a manner that an
amount of play is permitted at each up and down stroke of the piston.
The valve C has packing around its edge, and is in frictional contact with the
barrel, in order that when the piston descends a passage through the valve is formed
by it and the piston becoming separated.
When the piston ascends the upper face of it comes into contact and forms the
piston complete to produce suction to lift water from the condenser by the pipo D.
The water which is above the piston is forced by its up stroke to lift the top
valve E, which is also of metal, and returned to its scat by the upper spring F, the
water passing through the pipe G to the tank H, or to another receptacle as
desired.
J is the barrel of the feed pump, and K is the valve formed with a long spindle L
which is made to fit and move within a hole bored in the plunger M.
In practice this spindle becomes coated with grease, and serves by contact to lift
with the plunger, and the valve be kept open while the plunger continues its up
stroke, to allow a free passage of water from the tank or other source of supply by
the pipe R to fill the barrel J, the water on the down stroke of the plunger being
forced past the valve N, and fed into the boiler by the pipe P. Q is the air vessel
on the outlet pipe P.
Figure 3 represents our air and feed pumps combined, Figure 4 being a plan view
of same.

page_text: Having now described the nature of our said Invention, and in what manner the
same is to be performed, we declare that we claim,―
The improvements in air and in feed pumps, and the arrangements of the parts
in detail as described and shown in the annexed Drawings, whether said pumps be
used separately, as indicated by Figures 1 and 2, or combined, as in Figures 3
and 4.
In witness whereof, we, the said Francis Charles Simpson and Joseph Basil
Denison, have hereunto set our hand and seals, this Twenty third day of
February, in the year of our Lord One thousand eight hundred and
eighty one.
FRANCIS CHARLES SIMPSON. (L.S.)
JOSEPH BASIL DENISON.
(L.S.)