Iм- PROVEMENTS IN ROTARY PUMPS
Year: 1873

page_text: LETTERS PATENT to Luke Chapman, of Collinsville, Connecticut,
United States of America, Machinist, for the Invention of "Iм-
PROVEMENTS IN ROTARY PUMPS."
Sealed the 17th October 1873, and dated the 1st July 1873.
COMPLETE SPECIFICATION filed by the said Luke Chapman at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 1st July 1873, pursuant to the 9th Section of
the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, LUKE
CHAPMAN, of Collinsville, Connecticut, United States of America.
Machinist, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN ROTARY PUMPS," and have petitioned Her Majesty to grant unto me,
my executors, administrators, and assigns, Her Royal Letters Patent for

page_text: the same, and have made solemn Declaration that I am the true and
first Inventor thereof.
NOW KNOW YE, that I, the said. Luke Chapman, do hereby declare
that the following Complete Specification, under my hand and seal, fully
describes and ascertains the nature of the said Invention, and in what
manner the same is to be performed in and by the following statement,
reference being had to the accompanying Drawings, in which Figure 1
is a side elevation of one form or construction of the pump.
Figure 2 is an end elevation of the same with the cap which covers
such end removed so as to expose the interior; Figure 3 is a view of the
- inner face of such cap.
Figure 4 is a view of one of the cylindrical valves made use of in this
pump; Figure 5 is an end view of such valve; Figure 6 is a central
longitudinal sectional view of such valve; Figure 7 is a view in cross
section of such valve.
Figure 8 is a view in cross section of the cap or plate shown in
Figure 3 through the dotted line x, x, with the rings shown in
Figures 9 and 10 in its place, the section cutting the ring through the
dotted line x, x, in Figure 9; Figure 9 is a face view of such ring;
Figure 10 is an edge view of such ring.
Figure 11 is an end elevation of a second form or construction of the
pump with the cap which covers such end removed so as to show the
interior.
Figure 12 is a view of the shaft and valve frame used in the pump
shown in Figure 11 with the valves in the frame, and one of such valves
cut in central longitudinal section.
Figure 13 is a view of the outer face of one of the two arms com-
posing the valve frame shown in Figure 12; Figure 14 is a view of the
inner face of such arm; Figure 15 is an edge view of such arm.
Figure 16 is a full length view of one of the two duplicate rotating
pistons used in the pump shown in Figure 11; Figure 17 is an end view
of such piston.
Figure 18 is an end elevation of a third form or construction of the
pump with the cap covering such end removed.

page_text: Figure 19 is a side clevation of the pumps shown in Figures 11 and 18,
their exterior construction being the same.
Figure 20 is a top view of the pump shown in Figure 19.
Figure 21 is a full length view of one of the duplicate rotating pistons
used in the pump shown in Figure 18; Figure 22 is an; end view of
such piston.
Figure 23 is an end elevation of a fourth modification of the pump
with the end cap removed.
Figure 24 is a side view of the interior mechanism of the pump
shown in Figure 23; Figure 25 is an end view of the parts shown in
Figure 24; Figure 26 is a similar view of the same parts shown in
Figure 24 somewhat modified in arrangement.
Figure 27 is a top view of a fifth modification of the pump; Figure 28
is a view of the pump shown in Figure 27 in vertical section through
the plane indicated by the dotted line x, x¹; Figure 29 is a similar
sectional view through the dotted line x², x².
}
Figure 30 is a view of the pump shown in Figure 27 in horizontal
section through the dotted lines a³, x³.
Figure 31 is a view of the pistons and valves of the pump shown in
Figure 27, a top view; Figure 32 is an end view of the parts shown
in Figure 31.
This pump in all its forms is one of the class of rotary forcing pumps,
and is as well adapted for a rotary motor meter or blower as a pump,
and one essential and peculiar feature found in all the forms is the use
of cylindrical valves distinct and separate from the rotating pistons
resting in corresponding seats in the pistons and held against the inside
of the containing casc or shell.
I will first describe the construction of the form of pump shown in
Figures 1 to 10 inclusive. The letter 2 indicates the exterior case com-
posed of two intersecting hollow cylinders; b, b, are the caps which
cover the two ends fastened on by screws 6¹ and having bearings and
boxes 62 for the shafts c¹, d', on which are fixed the rotating pistons c, d;
which are caused to rotate with equal motion in opposite directions by
the gears d², to one of which shafts as c¹ the driving power may be
applied. These two pistons are solid cylinders of equal diameter having

page_text: f
groove
62
parti-circular valve seats c³, d³, in their surfaces. The surfaces of these
two pistons would be in constant contact during their revolution were
it not for these valve seats. The valves e are also cylinders just fitting
in their seats and filling out to the inner surface of the shell a. When
the piston c rotates in the direction indicated by the arrow water is
taken in at the pipe f and discharged through the pipe f". The valves
do not part company with the piston c but always remain with it. In
the inner face of each of the caps 6 there is sunk an annular
in which justs fits and freely turns a ring g, the face of the ring being
flush with the inner face of the cap. In these rings are bored the
holes g¹ to serve as bearings for the axes ¹ of the valves. These
rings revolve with the piston c and hold the valves accurately in
place, furnishing at once a support and connection for them. In
the back of these rings is a small annular groove 92 (indicated by
dotted lines in Figure 9), into which small holes g³ are bored from
the front face of the ring, thus admitting water to the back side of
the ring to serve as a lubricator. The valves consist of an inner
core preferably of metal and an outer coating of rubber, raw hide,
or other suitable material. The core may have longitudinal grooves 2ª
and also grooves running around the core, which are filled by the
rubber or other outer coating, thus preventing such coating from slipping
on the core.
I will now describe the construction of the pump shown in Figures 11,
12, 13, 14, 15, 16, 17, 19, and 20. In these Figures the letter a in-
dicates the exterior casing formed of two hollow intersecting cylinders
of equal size. b, b, are the caps for the ends fastened on by screws b¹,
and having boxes and bearings 62 for the piston shafts c¹, d³, which are
made to rotate with equal motion in opposite directions, as indicated by
the arrows by means of the gears d² to one of the shafts of which driving
power may be applied. fis the ingress pipe, and f¹ the egress pipe.
On the piston shafts are fixed the rotating pistons c, d, which are solid
cylinders of equal size, having parti-circular valve seats c, d, in their
surfaces, which surfaces would be in constant contact during the revolu-
tion of the two pistons were it not for these valve seats. The valves e
are cylindrical, just fitting in their seats, and filling out to the interior
surface of the containing case. Each piston is equipped with two valves
held in the ends of the arms d', which extend from the piston shaft,
lying in grooves & just fitting them, made in the ends of the pistons,

page_text: and having journal pins de fitting into corresponding holes in the ends
of the valves. The outer faces of the arms d' are just flush with the
ends of the pistons.
I will now describe the construction of the pump shown in Figures 18,
19, 20, 21, and 22. This differs from the pump last described but
slightly. The arms for the valves are dispensed with, and each piston
holds its two valves e in place by having the seats therefor larger than
a half circle so as to embrace more than half the valve, and thus hold
it from escaping, the valves being inserted endwise into their seats, and
the corresponding valve seats in the opposite piston being correspondingly
less than a half circle.
I will now describe the construction of the pump shown in Figures 23,
24, 25, and 26. It differs but little from that shown in Figures 1 to 10
inclusive. The difference is this:-On each end of the piston c is a
circular end plate / of the same diameter as the interior diameter of the
lower and larger of the two intersecting cylinders of which the case of
the pump is formed. These two end plates revolve with the piston c.
The valves e are hung by their axes in the end plates h. It will be
readily understood from this description that these end plates perform
the same office as the rings g, seen in Figures 8, 9, and 10. Upon the
ends of the upper piston d are similar end plates % of the same
diameter as the internal diameter of the upper and smaller of the two
intersecting cylinders of which the containing case is formed. The end
plates k do not revolve with the piston d, and each has a parti-circle cut
out of it so as to fit upon and correspond to the periphery of the end
plates h, as seen in Figure 25. In place of having two, each of the
plates and k each piston may have but one, and that one set in the
center of the length of the pistons, as shown in Figure 26. In this
latter case the plate h embraces nearly the whole body of the valves e,
allowing them however to turn as before.
I will now describe the modification of pump shown in Figures 27 to
32 inclusive, which is practically a double or compound form of the
pump last described, except that no plates h or k are made use of.
The case or shell is composed of four hollow cylinders a, a¹, b, b'.
6 intersect, as do a¹ and b¹. a and a¹ are of equal size, as are also b
and 6. The piston c runs through a and 6', filling 6', but leaving a
water space around it in a. The piston d runs through a' and b, filling,
a and

page_text: but leaving a water space around it in a'. The piston c is equipped with
the valves e operating within the cylinder a. The piston d is equipped
with the valves e¹ operating within the cylinder a¹. The valves are held
in place in the same manner as those shown in Figure 18.
All the parts in all the pumps when not otherwise specified are
preferably made of metal. Although these forms of mechanism have
been herein-before described as pumps, it is obvious that they are nearly
or quite as well adapted for use as rotary motors, meters, or blowers.
I claim as my Invention,―
1. (Referring to Figure 2). The combination of a rotary piston or
valve carrier (c), the cylindrical valves (e) one or more in number, and
the cylinder (a) containing such piston and valves, when the valves are
separate and distinct from the piston bearing them and are held by such
piston at a constant and uniform distance from the center of the piston,
the whole constructed, arranged, and designed for operation and use,
substantially as herein-before set forth. .
.
2. (Referring to Figure 2). The combination of the rotary valve
bearing piston, the cylindrical valves separate from such piston, and the
upper non-valve bearing piston, all constructed, arranged, and designed
for operation and use, substantially as herein-before set forth.
3. (Referring to Figures 1 to 10 inclusive). The combination of the
subject matter of the last claim with the rings connecting the valves, all
constructed, arranged, and designed for operation and use, substantially
as herein-before described.
4. The combination and arrangement of pistons, valve arms, and
valves, shown in Figures 11, 12, 13, 14, 15, 16, 17, 19.and 20, all con-
structed and designed for operation and use, substantially as herein-
before described.
5. The combination and arrangement of rotary pistons and cylin-
drical valves, shown in Figures 18, 19, 20, 21, and 22, all constructed
and designed for operation and use, substantially as herein-before
described.
6. The combination of rotary pistons, cylindrical valves, and end
(or center) plates, shown in Figures 23, 24, 25 and 26, all constructed

page_text: and designed for operation and use, substantially as herein-before
described:
7. The construction of pump shown in Figures 27 to 32 inclusive, the
whole combined and designed for operation and use, substantially as
herein-before described.
In witness whereof, I, the said Luke Chapman, have hereto set
my hand and seal, this First day of May, in the year of our
Lord 1873.
LUKE CHAPMAN. (L.S.)