Improvements in Rotary Pumps, applicable as Pressure Blowers and Exhausters.COMPANYING
Year: 1893

page_text: Date of Application, 30th Sept., 1893
Complete Specification Left, 26th June, 1894-Accepted, 28th July, 1894
PROVISIONAL SPECIFICATION.
Improvements in Rotary Pumps, applicable as Pressure Blowers
and Exhausters.
JOSEPH THOMAS TOWLSON of 48 Wingfield Road, Norwich Mechanical
Engineer, do hereby declare the nature of this invention to be as follows:
--
The essential and novel feature in this invention of a rotary pump which forms
the subject of this Specification is the arrangement of parts as shown in the
accompanying drawing and set forth in the following Specification. The object of
the design and particular combination of details, as shewn and described, is to
construct a rotary pump with continuous suction and discharge,-possessing a
positive action, capable of pumping against pressure at high or low speeds,-having
no necessity for either suction or discharge valve, and that shall be more simple,
efficient, and, at the same time more commercially valuable than any existing rotary
pump.
DESCRIPTION AND REFERENCE TO ACCOMPANYING DRAWING.
A is the containing cylinder, (made of any convenient material), truly bored and
faced, and having one or two removable covers. B is the piston (or drum), made
of any convenient material which may be rotated by hand or power. The shaft, to
which the power is applied, for rotating the piston is located in the exact axial
centre of the rotating piston, the bearing (or bearings) formed in the cover (or
covers) being eccentric with the bore of containing cylinder A. The diameter of
the rotating piston B, is such, that, when its shaft is placed in its bearing (or
bearings) these bearings being not in the centre of the cylinder bore,-the
circumferential surface of such rotating piston is always in contact with a certain
part of the bore of the cylinder. The piston, in thickness, extends from cover to
cover of cylinder and works in close contact therewith. Across the diameter of
the rotating piston and extending from side to side a groove is formed, in which a
divided sliding abutment C and C' is fitted. On the piston being rotated the
sliding abutment is kept in constant contact with the bore of the cylinder chiefly
by reason of the mechanical action resulting from the arrangement of the parts,
but partly by light springs inserted at the division of the abutment. D is the
inlet and E is the outlet which may be reversed, the action of the pump being the
same whichever way the piston is rotated. In describing the action of the pump
it may be taken that the piston and abutment is being rotated in the direction of
the arrows shewn in the drawing. D being the suction the half C of the abutment
displaces fluid before it and drives it through the delivery E; but before the
abutment uncovers delivery E, the half C₁ of the abutment has covered D, thus,
allowing no direct communication between suction and delivery, giving the pump a
positive action without a valve, and permitting a continuous flow and discharge.
Dated this 28th day of September 1893.

page_text: VOBEL LAUL DE MULTICATION.
Improvements in Rotary Pumps, applicable as Pressure Blowers
and Exhausters.
JOSEPH THOMAS TOWLSON, Mechanical Engineer, now of 41 Elsie Road
Great Yarmouth, England, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
This invention relates to improvements in rotary pumps applicable also as
pressure blowers and exhausters, and may be used for pumping fluids of all kinds.
In inventing and designing the rotary pump that forms the subject of the
present Specification my object has been to produce a pump that is simple to
manufacture, low in cost, and of a substantial kind :-adapted to stand, without
injury, the hard work and rough usage and also scarcity of attention to which
machinery of this kind is invariably subjected.
Further, my object has been to produce a pump, blower, or exhauster, possessing
a great capacity of delivery in a very small space,-positive in its action without
the use of suction or delivery valve, and which does not depend on high speeds, or
centrifugal force for its efficient working.
I hereby declare that the following is a correct statement of the nature of the
invention, and in what manner the same is to be performed.
Sheet I. Figures I and II. A is the containing cylinder of any convenient
material, having a truly circular bore,-also having one, or two, removable
covers B, B¹.
C is a rotating piston of any convenient material, rotated, by hand or power by
means of a central shaft on one, or both, sides of the piston.
The rotating piston C is shewn with two bearings D, D' in Figure IV on
Sheet II, and with one bearing D in Figure II on Sheet I.
The rotating piston C may be driven in any or either direction; but it may be
assumed, for the purpose of the present Specification, to run in the direction of
the arrow.
E is the inlet nossle,--F is the outlet or discharge nossle.
G, G. are the two halves of a divided abutment of any convenient material, and
are made to slide, radially, in a slot provided in the rotating piston C.
This slot extends quite through piston, (axially), and also diametrically.
H, H' are feet that support the pump.
I, is the radial groove in piston in which the two halves of divided abutment G, G'
slide.
J, J', are faces of the halves of divided abutment that are kept in close, working
contact with the cylinder bore.
The axis of the rotating piston, being located below the axial centre of the
containing cylinder, it is necessary that the two halves of the divided abutment G, G'
should diverge and converge in relation to each other (when rotating with the
piston) a distance equal to the difference between the maximum diameter of the
cylinder bore K, K' and the minimum diameter L, L', measured horizontally
across the axis of the rotating piston.
This movement is supplied and controlled by suitable springs M, M¹ located in
one half or both halves of the divided abutment.
N. is a packing box for cup leather packing.
Sheet II. Figures III and IV. A is the containing cylinder.
B, B', are removable covers-C is a rotating piston,—D, D' are bearings.—E is
the inlet and F is the discharge.
G, G' are two halves of an improved sliding abutment.
The outer edges of the two halves of this sliding abutment are provided with

page_text: lips J. J as shewn; projecting for the purposes of the improvement on the pressure
Bide, (or delivery side) of the abutment.
The object of such provision of lips is to constitute a means whereby the pump
may be made to deliver against considerable pressures.
The amount of lip may be greater or less than shewn as may be deemed
necessary.
The action of these lips may be described :-They, being exposed to the pressure
the pump is forcing against; the greater this pressure the harder the edges J¹ J.
are pressed against the bore of the cylinder A. The action of the vacuum on the
suction side of the abutments also tends to pull the two halves of divided
abutment apart, and to cause a close contact with the bore of the containing
cylinder.
B* are plates of brass or any convenient material that does not oxidise under
the action of atmospheric air and water; intended to be used when pumps are
made of cast iron to prevent rusting at the sides.
In Figure IV of Sheet II the rotating piston is shewn in elevation.
The manner in which the pump performs its work on being rotated in the
direction of the arrow is as follows:-
A vacuum is formed behind the half G of the divided abutment into which the
fluid flows; and, the piston being rotated the half G' of the divided abutment
covers the inlet port before G uncovers the outlet; thus preventing the fluid that
has been displaced by the first or former stroke from returning thro' inlet port.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1st. The improved pump, blower or exhauster, as shewn in Figures I and II of
the accompanying drawings and described in this Specification.
2nd. The improved pump blower or exhauster as shewn in Figures III and IV
of the accompanying drawings and described in this Specification.
3rd. In a pump, blower, or exhauster the combination of outside cylinder,
rotating piston located eccentrically in outside cylinder having a divided sliding
abutment with lips and adjusted by springs, also having a plate of any suitable
metal or material between flanges of containing cylinder and outer covers,
substantially as shewn in drawings and described in Specification.
Dated this 25th day of June 1894.