AN IMPROVED CONSTRUCTION OF ROTARY PUMPS, ALSO APPLICABLE AS FIRE-ENGINE OR GARDEN-ENGINE.
Year: 1879

page_text: LETTERS PATENT to Gerard Wenzeslaus von Nawrocki, of the Firm of
J. Brandt and G. W. von Nawrocki, Patent Agents, of No. 124, Leipziger
Strasse, Berlin, in the German Empire, for the Invention of "AN IMPROVED
CONSTRUCTION OF ROTARY PUMPS, ALSO APPLICABLE AS FIRE-ENGINE OR
GARDEN-ENGINE.' A communication by 'Otto Rauchfuss, of Berlin, in the
German Empire.
"
Sealed the 10th February 1880, and dated the 27th August 1879.
PROVISIONAL SPECIFICATION left by the said Gerard Wenzeslaus von
Nawrocki at the Office of the Commissioners of Patents on the 27th August
1879.
GERARD WENZESLAUS VON NAWROCKI, of the Firm of J. Brandt and G. W von
Nawrocki, Patent Agents, of No. 124, Leipziger Strasse, Berlin, in the German
Empire. "AN IMPROVED CONSTRUCTION OF ROTARY PUMPS, ALSO APPLICABLE
AS FIRE-ENGINE OR GARDEN-ENGINE." [A communication by Otto Rauchfuss, of
Berlin, in the German Empire.]
According to the present Invention a rotary pump is constructed as follows:-.
A closed cylindrical casing has within it a revolving cylinder or drum mounted
on an axis in such a position, that at one point of its periphery it is in close contact
with the interior of the casing, which at such point has a longitudinal groove in
which is fitted a tongue or packing piece pressed outwards by a spring, so as to
form a close joint with the surface of the drum as this revolves in contact there-
with. The drum has two slots passing diametrically through it at right angles to
each other, in each of which slots are two slides that are pressed outwards in
opposite directions by springs placed between them, so that each slide is brought in
close contact with the surface of the casing, and as the drum revolves they are,
owing to its eccentric position, alternately pressed inwards by such surface against
the action of the springs as the space between the drum and the casing narrows,
and then pressed outwards by the springs as the said space widens. In order to
allow each pair of slides to work free of each other the one pair has at its inner
ends central projecting parts between which its springs are placed, and which pass
through correspondingly recessed central parts of the other pair, which have their
springs at the two ends.
The inlet and outlet passages enter the casing tangentially on each side of the
point of contact between the drum and the casing.
"
;
The above described apparatus may either be used as an ordinary pump, or by
attaching, a nozzle to its delivery pipe it may be used as a fire engine or garden
engine.

page_text: Fig. 1.is a transverse section; Fig. 2, a longitudinal section; Fig. 3, an external
elevation, and Fig. 4, a plan of a rotary pump according to this Invention;, Fig. 5
shews an elevation and section of the slotted drum;, Fig..6 shews the two pairs of
blades that fit in the slots of the drum; Fig. 7. shews a transverse section. to an
enlarged scale of the packing-piece; Fig. 8 is a sectional plan shewing the packing
piece; Fig. 9 shews the pump mounted as a garden engine.. A is the cylindrical
casing within which is mounted eccentrically the drum B having through it two
slots at right angles to one another, in which are fitted the two pairs of blades a.
The one pair, as shewn in Fig. 6, have tongue pieces and springs 6 near their ends,
and the other pair have tongues and springs in their middles, so that the tongues
of the latter pair have free space for their movement between the tongues. of the
former; E and G are the tangential inlet and outlet passages between which is
fitted the packing-piece H which is pressed forward. by a spring h. The front edges
of H-at c; c, as well as the outer edges of the blades a are rounded off, so that the
latter do not catch on the former as they revolve. The drum B may be driven
directly by hand, as shewn in Fig. 9, when the power required is moderate, or it
may be driven by gearing from any suitable motor, as shewn in Figs. 3 and 4.

page_text: Having thus described the nature of the said Invention, and in what manner
the same is to be performed, as communicated to me by my correspondent, I claim
the construction of rotary pump herein described with reference to the accom-
panying Drawings.
In witness whereof, I, the said Gerard Wenzeslaus von Nawrocki, have here-
unto set my hand and seal, this Twenty third day of February, in the year
of our Lord One thousand eight hundred and eighty.
GERARD WENZESLAUS VON NAWROCKI. (L.B.)