Improvements in Diaphragm-pumps.
Year: 1899

page_text: Date of Application, 29th Mar., 1899-Accepted, 29th Apr., 1899
COMPLETE SPECIFICATION.
Improvements in Diaphragm-pumps.
We, KURT BRÄUER, of Leipzig-Gohlis, and Max BAUER, of Leipzig-Eutritzsch,
Germany, Engineers, 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:-
The present invention has reference to certain "Improvements in diaphragm
pumps" and more especially to means for actuating the diaphragm in such a way
that its bulging out towards either side will always be the same, thereby warranting an
equal amount of raised fluid at each stroke. Such a pump will be found very advan-
tageous in connection with explosion motors, where it is imperative that the supply
of liquid fuel is a constant and unvarying one. The arrangements, now in use,
ordinarily consisting in a rod actuating the diaphragm from its centre, do not work
satisfactorily in as much as the diaphragm, being supported only at its centre, will
be influenced in different degrees according to the varying pressure and will
accordingly draw varying amounts of liquid fuel. According to the present invention,
the diaphragm is alternately supported over almost its entire surface by two pestles,
the working faces of which form a spherical sector, both having the same radius. The
bulging out of the diaphragm consequently will always be governed in exactly the
same manner and the amount of liquid raised at each stroke will invariably be
the same.
In order to make our invention more readily understood we have illustrated it on
the accompanying sheet of drawings, Fig. 1 of which shows such a diaphragm pump
partly in section. Fig. 2 shows the two pestles and the diaphragm in section.
The diaphragm a, fastened with its circumference in the ordinary manner within
the pump casing, is hollowed out spherically with radius of the segmental shaped
working faces of the two pestles b & d. A coil spring c presses the pestle b constantly
against the undersurface of the diaphragm a, whilst the pestle d rests upon the upper
surface of the said diaphragm. The parts, when in rest, will have the position shown
in Fig. 1, the working face of the pestle b being in contact with the diaphragm over
almost its entire undersurface. If now the pestle d is actuated by the working
engine, i.e. is pressed downward, the parts will take the position shown in Fig. 2,
the working face of the pestle d now being in contact with almost the entire upper
surface of the diaphragm and the spring c being compressed. The bulging out
towards either side of the diaphragm therefore is always the same and the amount of
fuel raised with each stroke is absolutely uniform.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is :-
In a diaphragm dump the combination of the two pestles & & b. one being spring

page_text: which form a spherical sector with the same radius and the diaphragm a held between
the said pestles and being hollowed out according to the radius of the pestle faces, as
set forth.