Improvements in Rotary Pumps.
Year: 1896

page_text: Date of Application, 20th July. 1396-Accepted, 7th Nov., 1896
COMPLETE SPECIFICATION.
Improvements in Rotary Pumps.
I, DAVID MORELL, of Wilhelmshöher- Allee 42, Cassel, Germany, Rotary
Pump Manufacturer, 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 stateinent :-
In rotary pumps having two winged pistons geared together inside the pump
cylinder, ruptures often occur in the working wing pistons owing to the entrance of
stones or other obstructions in the pump cylinder. As the two winged pistons are
compelled to run together, every obstruction between the working surfaces
violently destroys their kinematic connection, that is to say, ruptures must occur
either in the geared winged pistons or in their axles.
The present invention prevents these disadvantages by means of a spring
contrivance.
By this invention the axle of one of the revolving wing pistons is rigidly
connected with the source of power, but the axle of the second piston does not
receive its impulse directly from the first. A spiral spring is connected with the
second axle, the case or druin of which turns on this axle and is driven by the first
axle. As owing to the action of the spring the second winged piston endeavours
to hasten the first, the developing surfaces are continually kept in intimate contact.
Further, obstructions, such as stones &c., entering in the working surfaces are
unable to damage the pistons, as the spring allows the backward movement of one
of the pistons relatively to the other. The invention possesses a further very
important advantage, namely the easy working and slight wear and tear of the
revolving winged pistons.
In the accompanying drawing the subject of the invention is represented in five
figs. as follows;-
Fig. 1. is a side view of a pump with the invention fitted thereto;
Fig. 2 is a section of Fig. 1 at the line x-x;
Fig. 3 is a part plan view of Fig. 1; Fig. 4 is a section of same; and
Fig. 5 is a front view of the spring drum a with the cover removed.
The axles A and B carry on the inside of the pump P the already mentioned
winged pistons serving to draw up and expel the liquid. On the axle A, projecting
from the case of the pump, is a sleeve which is revolvably connected with the
axle by meaus of one or more keys pegs or wedges which are placed in grooves or
bores diametrical to the axle aud the sleeve h. The onter shape of the sleeve is
rectangular. Ou this sleeve is a movable star-shaped driver i, furnished with a
nave e, and projection 1. In the gaps of this star-shaped driver i engage the
rollers 9 which are arranged on a spring box a loosely fixed on the axle B yet
assured against sliding in the horizontal direction of the axle B. Inside the spring
box a is a very powerful spiral spring c which engages with its inner end in a slit
in the coupling-box k tightly fixed on the axle B, whilst the outer end engages
with a nut c' by means of which ou turning the screw din same, the spring c can
be more or less strained according to the pressure of the column of liquid. When
the pump is in action, the strained spring c causes the winged piston which is fixed
fast on the axle B, to endeavour to hasten forward, which results in a continual
insinuation of its wing on the friction surface of the other piston. Should such
foreign matters as sand, small stones &c. now come between the wings, these

page_text: matters can pass easily without in any way injuring them as the spring is so
strained that a relaxation of the winged piston and a corresponding distortion of
the axle B in the spring box a is rendered possible.
When it is required to set the pump going, and for this purpose it is filled with
water from above, it is preferable to draw back the driving plate f so that it is out
of contact with the rollers g in order to allow the backward run of the pistons.
For this purpose the driving plate fis movable on the rectangular sleeve h. To
maintain the star-shaped driver in the drawn in or drawn out position a sheet
spring m is employed fixed on the nave e of the driver i, and furnished with a
peg m. The peg ml passes through a hole in the nave e and catches in a
corresponding hole in the rectangular sleeve h.
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 ;-
1. A rotary pump having two winged pistons brought against each other by
spring action, distinguished by this, that the revolution of one piston axle A is
transferred, through the medium of a spiral spring e whose tension can be regulated,
to the other piston-axle B in order, on meeting with foreign matters between the
pump wings, to effect a reciprocal relaxation of the same, substantially as
described.
2. A pump of the kind indicated in Claim 1 distinguished by the spring box a
arranged on a piston axle B and carrying a spiral spring c one end of which engages
on the axle B and the other end with a nut e movable on a fixed screw d on the
side of the spring box a, whilst rollers g fastened to the spring box engage in the
gaps of a star-shaped driving wheel i, which latter is kept safely in its place on
the axle A by means of a sheet spring m provided with a peg m¹ which passes
through the nave e of the driving wheel i and is by the spring m pressed into
corresponding holes in the rectangular sleeve / fixed fast on said axle A substantially
as described and illustrated.
Dated this 20th day of July 1896.
F. W. GOLBY,
36 Chancery Lane, London, W.C., Patent Agent for the Applicant.