Improvements in Air Pumps or Inflators.
Year: 1895

page_text: Date of Application, 17th Aug., 1895
Complete Specification Left, 28th Apr., 1896-Accepted, 4th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Air Pumps or Inflators.
We EMANUEL KRAUS, Mechanician, of 54ª Holzmarktstrasse Berlin and
FRIEDRICH VOLKMAR BRÜCKNER, Merchant of 67 Kantstrasse Charlottenburg
both in the Empire of Germany, do hereby declare the nature of this invention
to be as follows:-
The object of the present invention is to construct an air pump or inflator of
high efficiency, yet requiring only a comparatively small effort to set it in action
and moreover adapted to be slid together into a small compass conveniently for
transport.
The characteristic feature of this improved air pump is that a number of
cylinders are arranged so as to be slid into each other in the manuer of an
ordinary telescope, the piston arrangement being such that on sliding such
cylinders into each other, the air successively passes from one into the next
cylinder. All cylinders save the last one are provided with a soft leather piston,
the latter being each bent outwardly so as to form a sort of cup while they are
suitably fastened on to the cylinders and have each an opening in the middle.
These said pistons always move in the preceding cylinder so that each cylinder
serves as piston for the next one. Suction ports are provided in each cylinder.
The first and smallest cylinder is solidly arranged in a tube which is closed at one
end where it adjoins the air force port. This tube forms a handle and also exterior
casing to the whole when closed. The last and largest cylinder is closed at the
outer end by means of a suitable air tight screw cap.
Dated this 17th day of August 1895.
HERBERT HADDAN & Co.,
Agents to the Applicants.
CUMI LEIE DI MUIFICATION.
Improvements in Air Pumps or Inflators.
We, EMANUEL KRAUS, Mechanician, of 54 Holzmarktstrasse Berlin and
FRIEDRICH VOLKMAR BRÜCKNER, Merchant, of 67 Kantstrasse Charlottenburg,
both in the Empire of Germany, 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 object of the present invention is to construct an air pump or inflator of
high efficiency, yet requiring only a comparatively small effort to set it in action,
and moreover adapted to be slid together into a small compass conveniently for
transport.

page_text: telescope and provided with projections 6 and 6 in order to prevent said cylinders
from being entirely pulled out of each other. The projections b₁ are either
provided with grooves to let the air pass, or they do not reach entirely to the
cylinder wall surrounding them, thus leaving a free annular space. With exception
of the one end cylinder all the cylinders are provided with a soft leather
piston c¹, c² e which is secured to the cylinder end and possesses in the
middle an opening &, d d with the exception of the last of such leather
pistons which has no such opening. These pistons are bent outwardly so as to
form a sort of cup. Therefore each cylinder serves as a piston to the following
cylinder and as a cylinder to the preceding piston. Near the ends of the
cylinders, with the exception of the last inner cylinder, are arranged air suction
openings e¹, e..... eo. To the exterior last cylinder is connected the air force
nozzle g upon which may be screwed a convenient pipe-piece s which when not in
use may be screwed at the other end into the smallest cylinder. The pipe
piece or the force nozzle should of course be closed by any closure during the
suction of the air and opened during the forcing of the air, which for instance, is
effected in the application of this inflator to pneumatic tyres by an anti-return
valve arranged in the latter.
The inner last cylinder is connected firmly with a sleeve f with which it moves
together and which is of a diameter a little larger than the exterior last cylinder,
in order that it may be moved over the latter.
When the cylinders are moved from the position of Fig. 1 into that of Fig. 2,
air enters according to the arrows through the opening e', E².... .e: this air
takes its way between each two cylinders, passes the projections b', raises the soft
leather pistons from the cylinder walls and so enters into the cylinders. When
the latter are now moved together, the compressed enclosed air causes the soft
leather pistons to press upon the cylinder-walls and close air tight in order that
the air is forced to enter through the middle piston openings ¹, d³. . . . . do always
in the next following cylinder in order to be finally driven out through the
nozzle g.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
An air pump consisting of several hollow cylinders a¹, a² etc. movable one over
the other in the manner of telescope tubes with soft leather pistons e¹, c³, arranged
on their one end adapted to give, during suction, and closing tightly and
automatically during the forcing, and with air entering openings e¹, e etc. provided
on the other ends, whereby the one end cylinder serves as piston, the other end
cylinder only as cylinder, the cylinders between serving simultaneously as piston
and cylinder, in combination with inner projections b on the one end and exterior
projections which let the air pass on the other ends, and with an exterior sleeve f
or equivalent handle united with the last cylinder.
Dated this 27th day of April 1896.
HERBERT HADDAN & Co.,
18 Buckingham Street, Strand, London, W.C., Agents to the Applicants.