IMPROVEMENTS IN ROTARY PUMPS
Year: 1873

page_text: PROVISIONAL SPECIFICATION left by William Robert Lake at the
Office of the Commissioners of Patents, with his Petition, on the
9th May 1873. A communication from abroad by Jacob P. Carll,
of Brooklyn, New York, Merchant, and John Cook, of the City and
State of New York, Machinist, both in the United States of
America.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co.,
Patent Agents, Southampton Buildings, London, do hereby declare
the nature of the said Invention for "IMPROVEMENTS IN ROTARY PUMPS,"
a communication, to be as follows:-
The said Invention relates to pumps which employ an oscillating
piston; I use a segmental piston arranged to oscillate within a partially
annular chamber between a partition or dividing block, operating in
concert with or serving to control duplicate receiving and delivering
valves.
The said improvements consists in a novel construction of the shell,
provided with a cover, in combination with the segmental piston and
receiving and delivery valves.

page_text: by these improvements a separate ned plate may be dispensed with;
the suction or receiving chamber is located within the pump; a perfect
action is obtained for the valves, and a simpler construction and increased
facility for repairs are secured; compactness, cheapness, and increased
power are the main advantages of this improved pump. The said pump
which is semi or partly rotary, consists of three leading parts, namely, a
main body case, or shell, a face plate or cover, and the segmental piston.
The said main body case or shell is of a circular form and arranged to
stand in an upright position, and so that its axis lics horizontal or there-
abouts. The said body or shell is also provided internally with a partial
ring or flange, which serves in connection with the outer portion of the
body, its cover, and a partition to form the annular or partially annular
spaco and pump chamber or chambers in which the segmental piston
works. The upper portion of the said partial ring or flange is cut away
to receive an arm of the segmental piston, and to limit the travel or
stroke of the piston heads up and down or within the said chambers.
The lower portion of said partial ring or flange is connected with or made
to form an inverted V shaped projection which is provided with openings
on its opposite sides and carries two delivery valves.
The interior space above the discharge nozzles and above the upper
sides or faces of the piston heads forms a capacious air chamber to assist
in the expulsion of the fluid. Immediately under this inverted V shaped
portion on the bottom of the interior of the circumferential portion of
the shell is formed a suction or receiving chamber, which is also of an
inverted V shape, and carries on its opposite sides the inlet valves of the
pump that operate alternately with the delivery valves at every stroke of
the piston to keep up the action of the pump. A suction pipe or nozzle
opens into the receiving chamber, which by its construction and arrange.
ment lies wholly within the pump, thus obviating the necessity for a
separato bed plate, and does not interfere with the foundation on which
the pump stands or rests, also by its protrusion within the body, it serves
to reduce the dead load or lift of the fluid; and the oblique arrangement
of the valves secures for them an easy and perfect action.
The segmental piston has its ends or heads, each of which virtually
constitues a piston formed of plates in pairs, one of which in cach pair
is stationary, and the other adjustable; the said plates have arranged
between them a packing or packings of leather or any other suitabe
material, leather cups, or metallic packings being used if desired. Tho

page_text: operating shaft to which the arm of the segmental piston is secured
passes through a stuffing box on one or both sides of the pump to
prevent leakage around said shaft. On the outer end of this shaft, when
the same is arranged to protrude only through the one side of the pump,
is fastened a lever or brake by which the segmental piston is operated.
When the operating shaft projects through both sides of the pump as is
desirable in a large pump, the said brake should be forked to take hold
of the shaft on both sides of the pump.