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Jan» 7» 1947'
'.c. c. WILLIAMS
, 2,413,935
Filed Ju1y's,`1944
I ////
4 sheets-»sheet 2
c. c. WILLIAMS '
{Shoots-Shed 3
Filed July 3, 1944
JUL 7, 1947»
Filed July 3, 1944
4 Shasta-Sheet 4
APatented Jian.) 7; l1,947' .
calvin c. williams, Philadelphia, Paf
Application July 3, 1944, -Serial No. 543,253 `
1 claim. (c1. ics-iii)
This invention relates Ito an improved rotary>
pump and while being especially intended for use
as a blower in pumping gaseous fluids, such as air, »
may also be used with equal facility «for pumping
Among other objects, the invention seeks to
provide a pump wherein a gain in displacement
somewhat elliptical interior of the easing and the
arcuate rotor seat.
Figures lil, 11 and'12 are diagrammatic views '
showing the movement of the blades.
In carrying’the invention into effect, Iremploy
a casing it open at its ends and provided withl a
base il as well as with an inlet l2 at one side
will be had over a comparable pump having a cy
thereof and an outlet iii at its opposite side. Dis
posed in the inlet is a valve It which may be
lindrical casing of an internal diameter -equal to
the distance between aligned blades from tip to 10 rotatably adjusted for regulating the intake of
air, for instance, and varying the discharge presit further object of the invention is to provide
sure of the pump.
a pump wherein lthe tips of the blades will be
Detachably nxed to the casing it at one end is
caused to follow a somewhat `elliptical path`
an end cap` it having a hub it, and detachably
thereby to obtain a greater displacement of the
iixed to the casing at its opposite end is an end
pump as compared with like blades travelling in
cap il having a hub lll, Extending within .the
casing from the cap it is a ñxed crank shaft i9,
a circular path.
Still another'object of the invention is to pro
seen in detail in Figure 8 9i the drawings, and,l
vide a pump wherein the pump casing will,
as will .be observed, this shaft is provided at one
throughout -the major portion of its interior, be 20 end with a long terminal 2t While at the opposite
of somewhat elliptical _contour conforming to the
end of the shaft is a short terminal 2i aligned
with the terminal it. The shaft is further pro
travel of the tips of the blades, but wherein the
vided with spaced cranks 22 having aligned pins
somewhat elliptical inner surface of the casing
will .be interrupted at one point by an arcuate
2t, while the outer ends of said pins are reduced
seat accommodating the periphery of the rotor
to forni necks 2t. VRigidly iixed to the hub lli of
and cooperating therewith to form a working seal
the end cap l5' is a detachable end plate 2t hav
ing a sleeve tti through which the terminal 2t of
between Ithe inlet and the outlet of `the pump.
the shaft it extendsy and locking the shaft in
A further object of the invention is to providev
a pump wherein substantially no friction will
said sleeve is a key 2li. The shaft Will .thus be
rigidly supported to extend in fixed position with
occur between the tips of the blades and the cas
in the casing ill.
ing so that the pump may be operated at high
speeds and adapting the structure for use as a
Mounted to turn about the axis of the shaft '
prime mover, if so desired.
I9 is a hollow cylindrical rotor 2t which, as seen
in Figures 2 and 3 of the drawings, is provided at
And the invention seeks, as "a st-ill further ob
ject, »to provide a pump wherein the discharge 35 quadrantly spaced points with chordal thickened
portions 29 having slots 30 therethrough, and
pressure thereof may be varied.
Other and incidental objects will appear >during
bracing the rotor internally are medial Webs 3|.
the ensuing `description of the invention, and in
Formed on the rotor at one end is a hub 32 having
the drawings:
a sleeve 33 which freely but closely surrounds
Figure 1 is a vertical longitudinal sectional 40 the terminal 2li of the shaft I9, and formed on
vview through my improved pump.
the rotor at its opposite end is a somewhat larger
Figure 2 is a transverse section on the line 2-2
hub 3ft having a sleeve 35, the outer end of which
of Figure 1.
lies ñush with the terminal 2 lA of the shaft. Fixed
Figure 3 is a transverse section on, the line 3--3
within the hub i6 of the cap l5 is a bearing 36
45 which surrounds the sleeve 33 and -rotatably sup
'of Figure 1.
Figure 4 is a transverse section on the line 4_4
ports the rotor at one end` and fixed within the
of Figure 1.
sleeve 35 is a bearing 3l which surrounds the ter
Figure 5 is a detail plan view of the rotor.
minal 2i of the shaft I9 and rotatably supports
Figure 6 is a fragmentary perspective view of
the- rotor at its opposite end.
one of the blades.
1t is now -to be noted that the rotor 28 is split
Figure '7 is a detail section on the line 'I-‘l of
at the plane of one pair of the slots 30 into like
Figure l.
complemental mating sections so that the rotor
Figure 8 is a detail perspective of the fixed
maybe assembled -about the pairs of blades later
crank shaft employed.
to be described, and formed on the hubs 32 and
Figure 9 is a diagrammatic view showing the 55 34 of the rotor are mating bosses 38. Engaged
through said> bosses are cap screws 39 detachably
securing the sections of the rotor together.
Extending through the hub i8 of the end cap
away to form an arcuate seat indicated at 8d.,
This seat is of' substantially the same radius, or
slightly more, say a few thousandths or so, than
l1 of the casing l0 is a drive shaft ¿id aligned »
the radius of the periphery of the rotor 23 and
with the axis of the shaft I9, and formed on the 5 is struck from the point 51 as a center. Accord«
drive shaft is a head M which snugly fits over
ingly, said seat is curved to fit the periphery of
the outer end of the sleeve 35 of the hub 3è of
the rotor with which it coacts to form a working
the rotor 28 and seats against said hub. De
seal between the rotor and the casing throughout
tachably securing the head to the hub are cap
a relatively wide arcuate area lying between the
bolts t2. Fixed in the hub i8 is a bearing d3
inlet i2 and the outlet i3 of the casing it), For
which rotatably supports the drive shaft, and
the purposes of this disclosure, I have indicated
detachably secured to the outer end of said hub
the area of the seal as extending for thirty de
is an end plate dll surrounding the shaft. Thus,
grees between the points G2 and E53 but as will
power may be applied to the shaft Il@ for turningr
be understood, the area of the seal may, oi' course,
the rotor. Formed through the terminal 29 of 15 be varied. It is important, however, to provide,
the shaft I9, as best seen in Figure 8 of the draw
instead of straight line contact as would otherwise
ings, is a duct d5 so that oil may be introduced
occur between the rotor and casing in the absence
into the casing, and disposed about said terminal
of the seat ed, a relatively wide seal since, as will
and about the shaft d@ are washers ¿it of felt or
be explained, the tips of the blades 5l will follow
the like to prevent leakage.
the curve Gil; between the points @2 and E33 so
Mounted upon the crank pins 23 of the shaft is
that said seal must alone serve to cut oii‘ com
are bearings d1, and in this connection it isto be
munication between the inlet and the outlet of the
observed that. the outer side plates of the cranks
22 of the shaft are beveled at their ends so that
Referring now to Figures 10, 1l and l2 of the
the bearings may be slipped over the terminals of 25 drawings, reference letters will be used to avoid
the shaft and over said plates to be thus installed.
confusion with the reference numerals of the
Fitting the necks 2li of the pins are sectional stop
other ñgures of the drawings. One of the cross
collars d8 blocking outward displacement of the
heads 59 is indicated'at A and the top and bot
bearings, and detachably securing'said collars in
tom edges thereof, as viewed in Figure 10, at B
position are split spring rings 45.*.. Fitting the 30 and C respectively. A blade unit comprising one
outer race rings of the bearings are square cross
pair of the blades 5i is indica-ted at D, one pair
heads 59.
Cooperating with the crossheads 59 are pairs of
oppositely disposed blades 5l which are slidably
of the saddle plates 5d thereof at E, and the top
and bottom edges of one of the yokes between the
' blades of said unit at F and G respectively. The
received through the slots 30 of the rotor 28, and, 35 rotor 28 is indicated at H and an arbitrary point
as will be noted, the thickened portions 29 of the
thereon at I. The points 56 and 51 as well'as the
rotor will provide a correspondingly wide bearing
circle 59, as used in Figure 9, remain the same in
area between the walls of said slots and the
Figures 10, 1l and 12 and are so designated. Ex
blades.. FormedV on the blades at their inner
planation of the movement of one pair of blades
edges, as particularly seen in Figure 6, are mating 40 will suñice for both pairs of said blades.
yoke sections 52 which straddle the shaft I9, and
Assuming now that the blades D stand in the
detachably connecting said sections are bolts 53,
horizontal position shown in Figure 10, it will be
it being observed, as best brought out in Figure
seen that the longitudinal center of the blade
1, that the yokes of one pair of blades are stag
uni-t is disposed at the point 51 on the'circle 59
gered with respect to the yokes of the other pair
of blades. The blades of each pair of blades 45 while the plates E are at the edge B of the cross
head A. As the rotor H turns, the plates E of
are thus rigidly united to form a solid unit so
the blade unit will, by the action of the rotor on
that each blade of each pair will balance the
the blades, be shifted along the crosshead while
other blade of each pair and tend to counteract
the longitudinal center of the blade unit will trav
the effect of centrifugal force on the blades.
around the circle 59 until, when the point 1
Thus, the blade units are balanced and may be
on the rotor has traveled ninety degrees and the
rotated at high speed. Formed on the inner
blades D have reached a vertical position, as
edges of the blades at the ends thereof are saddle
shown in Figure 11, the longitudinal center of the
plates 54. which slidably fit against the edges of
the crossheads 50 to coact therewith and connect „ blade unit will be at the point _56 on said circle,
55 so that the plates E will be at a middle position
the blades with said crossheads.
on the crosshead,
Attention is now directed to Figure 9 of the
As the rotor H further turns and the point I
drawings. A circle is shown at 55. 'I‘his circle
has a center 56 which represents the axes of the
on the rotor has traveled one hundred eighty de
grees and has reached'the position shown in Fig
crank pins 23 of the shaft I9. A point 51 repre
sents the axis of the shaft and, consequently, the 60 ure 12, the longitudinal center of the blade unit
will have completed its travel from the point 56
_ center of rotation of the rotor, indicated on the
around the circle 59 to again lie at the point 51.
diagram by a circle 58, The distance between the
As will be observed, the edge B of the crosshead,
points 56 and 51 in a straight line is the distance
A is now at the bottom and the edge C at the top
which the bearings 41 are eccentric with respect
to the center of rotation of the rotor and is the 65 while the edge F of the yoke of the blades is at
the bottom and the edge G at the top. Thus,l dur
diameter of a circle 59. Struck from points on
ing one hundred eighty degrees of revolution of
this circle, say fifteen degrees apart more or less,
the rotor H, the longitudinal center of the blade
as suggested by the radial lines on the diagram, is
unit has travelled completely around the circle
a somewhat elliptical curve indicated at 60, which
70 59 while the blades have been shifted from one
end to the other of the crosshead, it being ob
served in Figure 12 that thev plates E are at the
tour of the inner surface of the casing l0, except
at that area represented between the points 62
edge C of the crosshead, The cycle will, of course,
and 63 on the diagram. Between the points 52
be repeated during the next one hundred eighty
curve coincides with the circle 55 at the area des
ignated 6|. The curve 60 represents the con
and 63, the inner surface of the casing is cut 75 degrees of revolution of the rotor.
- 2,413,935
As will be perceived in view of the foregoing.
the blades D, while being'l revolved, are not only
moved endwise in an arcuate path a distance
equal to the diameter of the circle 59, but are
also shifted in a straight-line path along' the
crosshead A. This arcuate en_dwise movement
and concurrent straight line sidewise movement
of the blades causes the tipsy thereof to describe,
' during each one hundred eighty degrees of revo-
lution of the rotor, a path which may be termed
somewhat elliptical, which is the curve 60 shown
in Figure 9. The tips of the blades will accord
Having thus described my invention, what I
claim is:
A rotary pump including a casing, end caps
fixed to _the casing and provided with hubs, an
end plate carried by the hub of one of said caps,
a stationary crank shaft extending into the cas
ìng,`said shaft being fixed at one end to said
plate and being free at its opposite end, a rotor
surrounding the shaft and provided with end1-0 sleeves, a bearing iìxed in the hub of said end
cap to coact with one of said sleeves externally
thereof and journaling the rotory at one end, a
ingly follow the somewhat elliptical contour of
bearing ñxed to the free end of said shaft to co
the inner surface of the casing without friction
act with the other of said sleeves in-ternally there
therebetween. Thus, at the area of theseat B4, 15 of and journaling the rotor at its opposite end, a i
the tips of the blades will not, as previously men
tioned, contact said seat due to the fact that the
drive shaft journaled through the hub of the
-other of said end caps and connected to the ro
seat is on a radius of the point 5l and interrupts y tor at the free end of the crank shaft, blades slid
the somewhat elliptical inner surface of the cas
ably 'received through the rotor tocoact with
ing for the width of the seat. As will now also 20 the casing, and means rotatably mounting the
be apparent, the pump will, due to the somewhat
blades on said crank shaft eccentrlcally of the`
elliptical inner contour of the casing, have a
greater capacity than a similar pump having a
casing of the same size but of cylindrical inner
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