IMPROVEMENTS IN ROTARY PUMPS FOR AIR AND LIQUIDS, WHICH WILL ALSO SERVE AS MOTORS
Year: 1888

page_text: Date of Application, 5th June, 1888
Specification Accepted, 2nd Nov, 1888
I, OSWALD SEIFERT, of San Francisco in the county of San Francisco and State of
California, United States of America, Farmer, residing at No 310 Waller Street,
do hereby declare the nature of my invention for "IMPROVEMENTS IN ROTARY PUMPS
FOR AIR AND LIQUIDS, WHICH WILL ALSO SERVE AS MOTORS" 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 improvements in Rotary Pumps for air and liquids, and
of that class in which the piston is a cylindrical block carrying wings, or hinged
plates, and set eccentrically for rotation in a stationary case, or chamber, of corre-
sponding cylindrical form
The improvements constituting my said invention consist in certain novel
construction and combination of rotating piston, revolving cylinder surrounding and
carried by said piston, and a stationary case having suitable ports and passages of
inlet and discharge, all as hereinafter fully set forth
The nature of the said improvements and the manner in which I proceed to
construct combine and apply them for operation are explained in the following
description and the drawings that accompany the same consisting of Figure 1, which
is a longitudinal section in part, and an outside view in part, taken from the front of
my improved pump, Figure 2 is a vertical cross section taken at about the line X, X,
figure 1, and Figure is a sectional view of the stationary case taken vertically and
longitudinally through it
Figure 4 is view of the piston with the surrounding loose cylinder in section,
Figure 5 is a front view of the piston-bloch and one of the wings, and Figure 6 is a
cross section of the parts shown in figure 5
The stationary case is composed of the parts A, A1, A3, of which the first-mentioned
part is the piston-chamber and contains both the piston and its surrounding loose ring
or cylinder The piston (B) is set eccentrically in the chamber and is fixed on a
propelling shaft (() that turns in boxes (A* A³) provided at the ends of the case,
and the loose cylinder (D), surrounding the piston, sets concentrically in the
case

page_text: The inlet or suction passage is seen 1 E, E, (figures 1, 2 and 3 of the drawings)
below the piston-shaft, and the outlet it F, F, above the line of the shaft, all entering
the chamber at the ends and communicating with the lunar-shape space or com-
partment between the piston and its surrounding loose cylinder
Two suction passages entering the cise from opposite ends can be joined in one
common inlet into which a pipe (H) can be screwed, and in like minner the two
outlets at the top can be brought together into one passage to deliver into a common
discharge-pipe (1)
But if desired a single suction and a single discharge can be
provided In such case the ports at one end will he dispensed with
The piston (B) is driven by power applied to its shift in any suitable or
convenient way, such as by a belt and pulley, and the loose cylinder surrounding
the piston is arranged to revolve freely with it, such movement of revolution bung
produced by the contact and pressure of the hinged wings (B*, B*, B*,) of the
piston against the interior surface of the cylinder
The piston-wings are curved plates nttiched it and along one edge or side to the
piston-bloch (B) by hinges b², b³, and if the other edge free to open outwardly from
is well is to close down agunst the piston-bloch
Under rotary movement of the piston these
one side of the center and are increased in
The face of the piston-block has recossed
They are suitably curved to shut closely against the block, and have also such
breadth of fico that they touch and bear at all times against the inner surface of
the surrounding loose cylinder Each one of these hinged plates therefore forms a
partition extending from the piston-block outward to the surrounding loose cylinder,
ind the whole number of plates divides the space inclosed between these two parts
into compartments, W, W, W, figure 2
compartments become reduced in area at
nea as they come to the opposite side
portions g, g, to take the plates, B* B* B*
These last-named parts are atta hed by a simple form of hinge-joint, as shown in
figures 5 and 6 of the drawing, consisting of cylindrical groove h formed across
the block B, and a bead of corresponding shape on the end of the plate, which is
slipped into the groove from the end of the block ind is kept from shifting endwise by
a stop-pin or other suitable mechanical means
In the upper part of the stationary case and to one side of the center is formed a
cylindrical recess K, into which is fitted a roller L having sufficient amount of
projection to run against the loose cylinder D The office of this roller is to keep the
cylinder tiue and prevent too great friction between the cylinder and the case at those
points where they are in contact during the operation of the pump, as at and in the
vicinity of the side where the roller is located there is tendency to greater friction than
at other points, by reason of the centrifugal force created by the revolution of the
cylinder-
==
The roller is located at this point to resist any tendency to lateral movement during
such revolution of the cylinder within the case, and that portion of the cylinder-
surfire where the roller bears may be reinforced if necessary by a band or portion of
greater thickness to resist wear As thus constructed and arranged these parts
operate as follows -Power is applied to the piston-shaft by a belt and pulley or
other means from a power-shaft and by it the piston is rotated rapidly within its case
and, at the same time, by virtue of the frictional contact, the loose cylinder (D) is
carried around with the piston Such rotation tihing place in the direction of the
ow Z figure 2, the spices or compartments (W W etc) are regularly cared into
line with the ports in the heid of the case, first, with the suction side that is below the
center, and then with the discharge above the center In this movement the hinged
plates are caused to unfold, or open out, from the piston-block at one side as they pass
down ind under the center, and then to gradually close as they pass upwards and over
the center The compartments decrease in this manner until the plates shut down
against the piston-block, at which point the back of the plate comes against the
surrounding loose cylinder
It will be evident that by connecting the pressure side of a pump constructed in
this manner with any suitable motive power, as air, or gas under pressure, the piston

page_text: can be made to turn the shift and a rotary engine can be produced, in such cise
some suitable means for controlling and regulating the supply of the motive agent
will be provided, but this can be done by any practical mechanic who is familiar with
the construction and operation of this class of pumps and engines
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
H
1 In a rotary pump or engine of the character described, the combination of a
rotating piston having lunged folding wings or plates and set for rotation eccentrically
within stationary case or chamber, a loose ing or cylinder concentric with said
chamber and inclosing the sud piston, and guide-roller or similar suitable means
for controlling the said loose cylinder in position, is set forth
2 In a rotary pump or engine of the character described, a piston having hinged
folding wings or plates that are adapted to open out from the piston-block and to shut
down against it, and the surrounding loose ring or cylinder, D, in combination with a
piston-chamber within which the said piston is set to rotate eccentrically and the loose
cylinder concentrically, the said chamber having ports and passages of inlet and
outlet, substantially as set forth
3 The herein-described pump, consisting essentially of the stationary case having
piston-chamber A, and roller-chamber, or recess, K, and inlet and discharge ports and
passages at the ends, the eccentrically set piston, B, provided with folding wings or
plates, B*, B*, B*, the concentric cylinder, D, surrounding the piston, and the guide-
roller, L, all combined for operation as set forth
'
Dated this ɔth day of June 1888
HASELTINE, LAKE & Co,
45, Southampton Buildings, London, WC,
Agents for the Applicant