Improved Device for Automatically Filling Pneumatic Tyres.
Year: 1898

page_text: Date of Application, 26th Nov., 1898-Accepted, 25th Feb., 1899
COMPLETE SPECIFICATION.
Improved Device for Automatically Filling Pneumatic Tyres.
I, BENNY CAIIN, of No. 10, Eschersheimer-Landstrasse, Frankfurt on the Main,
Germany, Engineer, do hereby declare the nature of my said invention and in
what manner the same is to performed, to be particularly described and ascertained
in and by the following statement;-
The present invention consists of a device for automatically filling pneumatic
tyres as herein after set forth and particularly pointed out in the claim.
In order to render the present specification more easily intelligible reference is
had to the accompanying drawings in which similar letters of reference denote
similar parts throughout the several views;-
1
Fig. 1 is a vertical section through one form of carrying out the invention
showing the gas holder in side elevation, Fig. 2 is a similar section through a
modified form of the device and
Fig. 3 is a similar section through a further modification.
According to the present invention fluid pressure is fed to the tyre from a
reservoir containing a fluid under pressure, which gasifies on being released into
the tyre. Any of the well known liquified gases may be employed.
SO as to move
The tyre A is provided with the usual inlet tube E, to which is fixed the
external fitting D, which is provided with internal seats F, F of different
diameters adapted to receive two valves of corresponding diameter K and J,
said valves being rigidly connected by means of a rod
simultaneously. The reservoir B is screwed or otherwise affixed to the upper
part of the fitting D and provided with a stop cock C.
The device operates in the following manner:-
As soon as the pressure in the tyre A sinks below that in the receptacle or
reservoir B, the pressure in the latter will open the valves J, K and flow into the
tyre A.
The fluid pressure will continue to flow into the tyre until the larger
valve K is closed by the internal pressure. If now the pressure in the tyre
decreases by leakage or from any other cause the valve will operate automatically
and feed further fluid pressure to the tyre as will be evident.
In Fig. 2 a modification of the device is shown, according to which pistons L
and M of different diameters are employed, the smaller piston L serving to close
a port N leading from the cylinder of the said smaller piston to the tyre. The
action of the device is otherwise the same as that previously described, since
when the required pressure is in the tyre the smaller piston L will close the
port N owing to the movement caused by the internal tyre pressure on the larger
piston, whilst when the tyre pressure is too low the pressure from the reservoir
will move the smaller piston L and open the port N to establish communication
between the interior of the reservoir B and the tyre A.
In the modification shown at Fig. 3 the feed of fluid pressure to the tyre is
regulated by means of a spring which adjusted to the required tyre pressure by
means of moveable cap. In this case valves P and Q are rigidly connected
together and to a piston R which moves in a cylindrical extension of the fitting D.
The piston R is governed by a spring adjusted to the tension required in the

page_text: '
tyre by means of a screw cap U. Thus when pressure enters the space o it will
operate on valves P and Q of equal area and the pressure in the tyre will keep
both valves closed by acting on the piston R. If the pressure in the tyre A falls
below the required pressure the spring T will act to open the valve Q and allow
fluid pressure to flow into the space S and thence to the interior of the tyre and
as soon as the requisite pressure has been attained in the tyre it will act to close
the valve Qby means of the piston R as will be clear on reference to the figure
of the drawing. Thus will this form of the valve regulate any variation of
pressure between the tyre and the reservoir which may be due to atmospheric or
other influences.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:
-
1. An apparatus for automatically feeding fluid pressure to pneumatic tyres
by means of gas in condensed liquid form which gasifies on being let into the
tyre, characterised by closing surfaces of suitable proportion arranged within a
cylinder and adapted, at times, to establish communication between a tyre A and a
fluid pressure reservoir B substantially as described.
2. În combination with the device covered by Claim 1, the arrangement of a
port N governed by a closing surface and adapted to establish or stop com-
munication between the reservoir and the tyre substantially as described.
3. In combination with the device covered by Claims 1 and 2 the arrangement
of a governing spring to open the valve positively when the pressure in the tyre
sinks substantially as described.
4. In combination with the device claimed the arrangement of a screw cover to
the regulating spring by means of which the same may be adjusted to any desired
pressure, substantially as described.
.
5. The combination of an automatically operating fluid pressure feed device
for pneumatic tyres characterised by a fluid pressure reservoir B, a valve housing 1)
with valves PQ and piston R, spring T, or with valves J K as specified, the
said parts operating to automatically fill the tyre with fluid pressure and to
regulate the pressure in the same after the cock C has been opened substantially
as described.
0011 1
1000
REGINALD W. BARKER,
Applicant's Agent, 56, Ludgate Hill, London, E.C.