Apparatus for Inflating Pneumatic Tyres with Carbonic Acid or other Gases under High Pressure.
Year: 1896

page_text: Date of Application, 9th Nov., 1896
Complete Specification Left, 7th Aug., 1897-Accepted. 11th Sept., 1897
PROVISIONAL SPECIFICATION.
Apparatus for Inflating Pneumatic Tyres with Carbonic Acid or other
Gases under High Pressure.
We, FRIEDRICH ADOLF KOHLER of No. 240 O'berlaa, near Vienna, Austria,
Gentleman and CARL KOCSIS, VI Koenigs Klostergasse No. 3, Vienna Private
Functionary, do hereby declare the nature of this Invention to be as follows:-
This Invention has for its object to do away with present tedious process of pumping
air into pneumatic tyres which process has to be frequently repeated owing to the
facility with which the air leaks out.
It consists in charging such tyres with carbonic acid or other gases contained in a
liquid condition or under a very high state of compression in an apparatus provided
with indicating and filling devices, whereby such liquid gas is fed in small
quantities into the tubular tyre, where it expands from the liquid to the gaseous
form to the requisite extent for keeping the tyre at the required degree of
inflation.
The apparatus consists for this purpose of a suitable strong closed receptacle for
containing the liquid carbonic acid preferably it is made of a seamless steel tube
such as is produced by the "Mannesmann "process, the ends, which may be
reduced in diameter, being formed with a screw thread. Into the one threaded
end is screwed the indicating device while into the other end is screwed the
filling and feeding device.
The indicating device consists of a screwed plug screwing into the vessel and
having a central passage through which passes a bolt, the outer end of which has a
head or screw nut while the inner end carries a piston sliding in a cylindrical cavity
in the inner end of the plug, and acted upon by a spring placed behind it in the
cavity. The face of the piston is covered by a flexible diaphragm of gas-tight
material which is fixed by a screw ring gas-tight to a screwed projection on the
inner end of the plug, so that no carbonic acid can leak past the piston and its
stem.
The helical spring is of such strength that when the vessel is charged with
liquid carbonic acid the pressure hereof will force back the diaphragm and piston
against the action of the spring until the latter is so compressed as to form a
solid abutment. In this position the outer end of the stem projects to a moderate
extent beyond the end face of the plug and thus affords an indication that the
vessel is properly charged. The piston will continue in this position until only a
small quantity of carbonic acid remains in the vessel, when the spring, in over-
coming the pressure, will force the piston and its stem inwards, thereby indicating
by the approach of the outer nut or head of the stem to the surface of the plug,
that the vessel is nearly exhausted and requires recharging.
The charging and feeding device at the other end of the vessel may be of any

page_text: suitable known arrangement, but I prefer to employ the following construction for
the purpose. The plug closing that end of the vessel projects some distance beyond
the end of the latter, and has a lateral cavity closed by a screw plug through which
passes the screwed stem of a small piston valve faced with a suitable gas-tight
flexible packing material.
The bottom of the cavity has two small openings, one of which communicates with
a passage leading through the plug into the vessel while the other communicates
with a passage leading through the outer end of the plug to the outside.
When the vessel is not being used, the stem of the piston valve is screwed
inwards so that the facing of packing material closes the two above named openings,
and thus effectually prevents the escape of carbonic acid, while for feeding the tyres
the piston valve is screwed backward.
The outer end of the plug has a cap with a nozzle screwed on to it with suitable
packing and on the nozzle is fixed one end of a flexible tube, the other end of
which is suitably adapted to be attached to the storage vessel or to the valvular
nozzle of the pneumatic tube to be charged.
Dated this 9th day of November 1896.
ABEL & IMRAY,
A ents for the Applicants.
COMPLETE SPECIFICATION.
Apparatus for Inflating Pneumatic Tyres with Carbonic Acid or other
Gases under High Pressure.
We, FRIEDRICH ADOLF KOHLER, of No. 240 Oberlaa, near Vienna, Austria,
Gentleman, and CARL KOCSIS, of XVIII Martinstrasse No. 73, Vienna, Private
Functionary, 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 has for its object to do away with the present tedious process of
pumping air into pneumatic tyres which process has to be frequently repeated owing
to the facility with which the air leaks out.
It consists in charging such tyres with carbonic acid or other gases contained in a
liquid condition or under a very high state of compression in an apparatus provided
with indicating and filling devices, whereby such liquid gas is fed in small quantities
into the tubular tyre where it expands from the liquid to the gaseous form to the
requisite extent for keeping the tyre at the required degree of inflation.
On the accompanying drawing Figure 1 represents a longitudinal section of the
improved apparatus for filling pneumatic tyres with carbonic acid or other fluid
under pressure.
Figure 2 represents a sectional view of the top of the receptacle with the union
for connecting it with the filling pipe.
The apparatus consists of a suitable strong closed receptacle a, for containing the
liquid carbonic acid; preferably it is made of a seamless steel tube such as is
produced by the "Mannesmann" process, the ends, which may if desired be reduced
in diameter being formed with a screw thread. Into the one threaded end a¹ is
screwed the indicating device while into the other end a2 is screwed the filling and
feeding device.
The indicating device consists of a screwed plug b screwing gas tight into the

page_text: vessel and having a central passage with an axial bore b¹, through which is passed a
bolt c' which passes with a reduced extension c to the outside.
The inner end of the bolt o' carries a piston c, fitting in a concentric enlarge-
ment 62 of the bore b¹; over the piston c is a membrane of caoutchouc or other
suitable material cramped by a ring nut d onto the body of the plug, against
which membrane the piston c is constantly pressed by a strong helical or other
spring g enclosed by a cap g.
The elasticity of the compressed spring may be so calculated that it only begins
to expand after a certain degree of emptying of the receptacle has been effected and
when only gaseous carbonic acid is in the same. By this expansion of the spring
the holt. c is pressed inward, so that the end of the bolt which usually
projects beyond the cap g retreats. Thus so long as the bolt end c³ projects, from g¹
it indicates that the receptacle is charged with liquid enrhonic acid, while the
gradual receding and eventual disappearing of the bolt end e indicates that the
pressure in the receptacle is gradually diminishing and that it eventually only
contains sufficient carbonic acid for a few fillings, so that the owner is advised that
the appamtus requires to be refilled or replaced by a new one.
The filling and feeding device consists of a plug h which has two axial bores h¹
and h', which do not meet but are branched outward at h³ and h, and open in the
plane surface m of a valve chamber. This face m is covered by a disc-valve k of
flexible material behind which is a metal disc ¹ pressed upon by a screw l. On
forcing the valve k close against the face m, the communication between A and A*is
cut off and no fluid under pressure can consequently pass into or out of the vessel a.
On screwing back 1, fluid under pressure can pass either from 2 into h¹ if the
vessel a is to be charged, or from h₁ into h², if a supply of fluid is to be discharged
from a, the passage of the fluid being restricted to any desired extent by the
screw . The disc has its inner face formed convex, the highest point being made
to coincide with the centre of the passage hs and the screw being also in line with
the latter, so that on screwing up? the passage will be effectually closed against
any escape.
When the vessel c is charged with fluid under pressure, the head h is closed by a
screw cap p, with packing díse p; when it is desired to discharge a portion of the
fluid into a pneumatic tyre, the cap p is removed, and a tuhe n communicating with
the pneumatic tyre is secured to the head 5 so as to communicate with passage h
by means of a screwed union piece with suitable packing as shewn at
Figure 2.
The above described apparatus has the great advantage that the filling operation is
effected very rapidly without requiring any expenditure of power, and that the rider
can readily ascertain what store of carbonic acid or other compressed fluid he
possesses.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what we
claim is :-
1. An apparatus for filling pneumatic tyres with carbonic acid or other fluid under
pressure consisting of a fluid receptacle a, the one end of which is provided with a
filling and feeding device, while the other end has an indicating device, which latter
consists of a piston c, pressed by a spring against the inner gas-pressure and having a
stem cle the external end of which projects more or less beyond its guide
according to the pressure existing in the vessel and thus acts as an indicator of the
quantity of fluid under pressure contained in the vessel substantially as described.
2. In apparatus for filling pneumatic tyres with carbonic acid or other fluid under
pressure such as described in the first claim the use of a filling and feeding device
consisting of a plug h fitted gas tight in the gas receptacle a, and having two
channels A and AA opening laterally in the face m, of a valve chamber the

page_text: mouths of which channels are closed by a dise valve k, covering the surface m and
controlled by a screw and disc k¹ for limiting the opening movement substantially as
described.
1
1007
ABEL & IMRAY,
Agents for the Applicants.