IMPROVE- MENTS IN ROTARY BLOWERS PUMPS OR ENGINES
Year: 1885

page_text: I, ARTHUR ROLLASON of 5 Maddox Street, Regent Street in the County of
Middlesex Engineer do hereby declare the nature of said Invention for "IMPROVE-
MENTS IN ROTARY BLOWERS PUMPS OR ENGINES "
to be as follows:-
My Invention has for its object to provide an apparatus for forcing fluids such as
air water or the like or for being used as an engine actuated by the pressure of
a fluid which apparatus will present the advantages of working without any
appreciable loss from leakage and with but little friction as compared with such
apparatus as at present constructed.
I will describe the Invention as applied to a pump the arrangement being the
same when the apparatus is used as a motive power Engine.
In an apparatus constructed according to my Invention two drums are used each
having vanes thereon and recesses therein for the vanes of the opposite drum to
enter, as the drums revolve.
The drums and vanes are enclosed by and can be rotated in a suitable casing
preferably with flat ends and with semi-cylindrical sides, and the said casing is
provided with a suitable inlet and outlet.
The vanes on the respective drums are by preference placed in close proximity to
the recesses in the same, so that the vanes of the two drums may pass through the
recesses of their opposite drums at nearly the same time, by which means leakage
is considerably reduced as the fluid must for a portion of that time during which
the rolling surfaces of the drums are not in contact pass by two vanes or two lines
of contact instead of only one. At such portions of the revolutions of the drums
as the vanes are not engaged in the recesses the peripheries of the drums bear upon
each other.. The drums are geared together in such a manner that they rotate so
that the surfaces in contact move in the same direction and roll over each other at
the same circumferential velocity and with but little friction the vanes of each
drum forcing the fluid from the inlet to and out of the outlet of the pump.
I sometimes use with the two drums two rollers placed between the drums and
the outlet (or inlet) which in this case is bifurcated the said rollers being of such a
circumference and so geared with the drums that they revolve in such directions
that the surfaces of the said rollers which are in contact with each other and with
the drums move in the same direction and at the same circumferential velocity.
rD...631

page_text: The said rollers are recessed to receive the vanes of the drums as they revolve
and are preferably so placed that during all portions of the revolutions the
peripheries of the rollers are either bearing upon each other or upon the peripheries
of the drums.
So that in this arrangement leakage between the tips of the vanes and the
recesses in the drums is avoided and the said recesses therefore do not require to
be so accurately manufactured as when the pump is made with only two drums.
The vanes may be connected to the drums by recessing them longitudinally at
their inward parts to fit over corresponding projections or webs on the drum, a
projecting flat flange or lugs on the vanes preferably overlapping a flat part of the
periphery of the drum for easy adjustment when the tips of the vanes have worn.
The recesses in the drums and the tips of the vanes may be of any suitable shape
but I prefer for the purpose of manufacture to make them (or a portion of them)
arcs of circles.
When the two rollers are used two adjustable stationary abutments bearing
against the sides of the rollers are provided for the purpose of preventing leakage
at such times as the cylindrical portions of the rollers are not in contact with each
other.

page_text: BESTECS.
I ARTHUR ROLLASON of 5 Maddox Street in the County of Middlesex do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
My Invention has for its object to provide an apparatus for forcing and
exhausting fluids such as air water or the like or for being used as an Engine
actuated by the pressure of a fluid which apparatus will present the advantages of
working without any appreciable loss from leakage and with but little friction as
compared with such apparatus as at present constructed.
I will describe the Invention as applied to a pump the arrangement being the
same when the apparatus is used as a motive power Engine. Figure 1 is a trans-
verse sectional elevation and Figure 2 is a longitudinal sectional elevation of an
apparatus constructed according to my Invention. Two drums A are used each
drum having vanes a thereon and recesses a² therein for the vanes a of the
opposite drum to enter as the said drums revolve. The said vanes and recesses
extend throughout the length of the drums and the said drums and vanes are
enclosed by and can be rotated in a suitable casing B preferably with flat ends
and with semicylindrical upper and lower parts or sides, the ends of the drums
and vanes fitting closely against the ends of the casing and the vanes in their
revolution fitting closely against the semi-circular sides or upper and lower parts
of the said casing. The said casing is provided with suitable inlet and outlet
as shewn at C and D. The vanes a on the respective drums A are by preference
fixed to the drums in close proximity to the recesses a² in the same so that the
vanes of the two drums may pass through the recesses of their opposite drums at
nearly the same time by which means liability to leakage is considerably reduced
any leakage of the fluid must for a portion of the time during which the rolling
surfaces of the drums are not in contact take place past two vanes or two lines of
contact instead of only one. At such portions of the revolutions of the drums A
as the vanes a are not engaged in the recesses a³ the peripheries of the drums A
bear upon each other. The shafts of the drums A extend through the casing and
are geared together in any suitable manner that they rotate so that the surfaces in
contact move in the same direction and roll over each other at the same circum-
ferential velocity and with but little friction the vanes a of each drum forcing the
fluid from the inlet C to and out of the outlet D of the pump. I sometimes use
with the two drums A two rollers E (as illustrated by Figure 3) placed between
the drums A and the outlet (or inlet) which in this case is bifurcated as shewn
at F F the said rollers E being of such a circumference and so geared with the
drums A that they revolve in such directions that the surfaces of the said rollers E
which are in contact with each other and with the drums A move in the same
direction and at the same circumferential velocity.
The said rollers are recessed at e to receive the vanes of the drums as they
revolve and are preferably so placed that during all portions of the revolutions the
peripheries of the rollers are either bearing upon each other (as shewn in Figure 4)
or upon the peripheries of the drums A (as shewn in Figure 5) so that in this

page_text: arrangement leakage between the tips of the vanes a and the recesses in the drums
is avoided and the said recesses therefore do not require to be so accurately manu-
factured as when the apparatus is made with only two drums as in Figures 1
and 2-The vanes a may be connected to the drums A by recessing them
longitudinally at their inward parts to fit over corresponding projections or webs
on the drums a projecting flat flange or lugs' on the vanes preferably overlapping
a flat part of the periphery of the drum for easy adjustment when the tips of the
vanes have worn-This is shewn clearly in Figure 1.
The recesses a² in the drums and the tips of the vanes a may be of any suitable
shape but I prefer to make them (or a portion of them) arcs of circles.
When the two rollers E are used two stationary abutments bearing against the
sides of the rollers are provided for the purpose of preventing leakage at such
times as the cylindrical portions of the rollers are not in contact with each other.
These abutments may be adjustable-They are shewn in Figure 3 as being formed
by the parts of the casing marked G G. It will be evident without further
'description that if fluid under pressure be passed into the apparatus it will act as a
motive power engine or that the said apparatus can be used for pumping and
exbausting fluids or for creating currents of fluids as may be desired.
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
First. A rotary pump or engine consisting of drums (A) in a suitable casing
and provided with vanes and recesses the said drums being in direct contact at
'their peripheries and rolling together at the same surface speeds and the recesses
and vanes being relatively arranged to each other to the drum and to the casing
substantially as and for the purpose hereinbefore described and illustrated by
the accompanying drawings whether or not rollers (E) be used in combination
therewith.
Second. The arrangement and combination of parts constituting the rotary
pump or engine substantially as hereinbefore described and illustrated in Figures 1
and 2 of the accompanying drawings.
Third. The arrangement and combination of parts constituting the rotary
pump or engine substantially as herein before described and illustrated in Figures 3,
4 and 5 of the accompanying drawings.
1000