Improvements in Pneumatic Tyres and their Valves for the Wheels of Cyoles, Motor Cars, Carriages and the like.
Year: 1897

page_text: Date of Application, 30th June, 1897-Accepted, 14th Aug.,
1897
Improvements in Pneumatic Tyres and their Valves for the Wheels
of Cyoles, Motor Cars, Carriages and the like.
A communication by HENRY SETH of No. 1 Lasarettogatan, Abo, Finland, in the
Empire of Russia.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of The Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, & 6 Bank Street, Manchester, both
in the County of Lancaster, 118 New Street, Birmingham, in the County of
Warwick, & 322 High Holborn, in the County of Middlesex, Civil Engineer 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 relates to pneumatic tyres and their valves for the wheels of
cycles, motor-cars, carriages and the like and has for its object the combination
of two or more pneumatic indiarubber tubes forming together a tyre so arranged
that either of the tubes can be inflated independently.
The invention will be described with reference to the accompanying drawings,
in which,
Figure 1 is a section through the tyre and valve and the slit for the insertion
cf the inner tube';
Figure 1 a similar section showing a modification of the valve;
Figure 2, a section through the tyre to one side of the valve and through said
slit;
Figure 3, a section through the tyre away from the valve and the said slit, and
showing the outer tube only inflated, the inner tube being collapsed against the
inner side of the outer tube;
Figure 4, a simliar section showing the inner tube only inflated; and
Figure 5, a similar section showing both tubes inflated, the inner one, however,
with less pressure so as to leave a space between the two tubes.
The arrangement of this improved tyre and valve is as follows, taking for an
example a tyre with two tubes.
The outer tyre a is made of indiarubber strengthened in the usual manner with
canvas and forms a complete tubular ring with the exception of a slit b on the
inner side of the ring. This slit is about 2 inches long and forms an opening
through which the inner indiarubber tube c is introduced into the outer tube.
The outer tube is made of the ordinary quality and thickness to enable it to with-
stand wear and tear when running on the roads. The indiarubber of the outer
tube is made of greater thickness around the slit b for a length of about 3 to 4
inches and the edges are so shaped as to overlap one another, two washers d and e
of aluminium or other suitable material being placed the one on the inside and the
other on the outside of the slitb and drawn together 'by means of one or more bolts

page_text: and nuts or other suitable means so as to press the overlapping edges of the slit
tightly together and thus form an airtight joint.
C
The inner tube c is made of soft indiarubber and is thinner than the outer tube.
One end of this tube c is introduced through the slit into the outer tube a and
pulled through said tube until the two ends of the inner tube meet at the opening
of the slit 6 in the outer tube a when an airtight ring is formed of the said inner
tube by inserting one of its ends into the other end and cementing the two together
by means of rubber solution.
..
The two tubular rings are thus arranged one inside the other, both airtight and
without any communication for air from one to the other, and a nipple with two
valves is inserted from the inside of the tyre in such a manner that either of the
rings may be inflated independently of the other ring by means of an ordinary
air pump
The nipple with two air valves g and h is attached to the inner air tube c
by means of its flange f¹ and hollow nut k and is preferably placed through the
two washers de at the jointed slit of the outer tube a and secured by a nut 7,
a further nut m securing it to the rim of the wheel. This nipple contains two
air passages, one of which leads to the inner tube e from the valve 7, and the
otlier through the hollow nut to the outer tube a from the valve h. A nozzle i,
which has only one air passage, is secured on top of the nipple by means of a
cap, the said nozzle being so arranged that it may be turned to bring its air
passage into communication with either one or the other of the two air passages in
the nipple. The outer end of the nozzle i can be connected with 'the air pump in
the usual inanner.
Another arrangement of the valved nipple is shown in Figure 1 and 'consists in
omitting the nozzle and forming the end of the nipple with two separate
female unions for the air pump to be screwed into one or the other as the case may
be, these unions in this case being directly connected with the two respective* air
passages in tue nipple.
:༣ ༣ tt”
:
Where more than two tubes are used to construct the tyre, the said nipple must
of course be provided with more than two valved passages in order that each tube
may be inflated independently as before described.
This improved double pneumatic tyre is used as follows:-
; 1
The outer tube a is intended to be used as a pneumatic tyre alone until, it gets
punctured or otherwise injured' by 'wear and tear, whilst the inner tube c which
is deflated and of a slightly smaller diameter than the outer tube lies collapsed at
the inner side of the outer tube as shown in Figure 3 and is rigidly held in this
"position by the air pressure in the outer tube.
The inner tube being thus well away from the tread of the outer tube is well
protected from being injured simultaneously with the outer tube and in ordinary
use therefore only serves as a reserve to be used only when the outer tube leaks
from any cause.
'
When the outer tube gets punctured or otherwise leaks the inner tube is
immediately put into use and inflated, as shown in Figure 4, thus rendering the
tyre without difficulty again in prefect working order.
The outer tube should then of course as soon as possible be repaired and put
into use, the inner tube at the same time being deflated and held in reserve as
before.
Should the tyre again be injured during the same run so that the inner tube
is no longer airtight, then a provisional repair can be effected by injecting some
rubber solution into the puncture of the outer tyre so as to run between the two
tubes. The outer tube is then pressed against the rim of the wheel for a few
minutes after which the inner tube being now cemented to the outer tube may, bo
again inflated and the two tubes again form an air tight tyre.
Another way of using this double pneumatic tyre is to keep both the tubes
inflated, but the inner one with a less pressure as shown in Figure 5, thus
obtaining a greater elasticity in the tyre than has hitherto been attained: arts

page_text: Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is:
1. The improvement in pneumatic tyres which consists in forming them of two
or more independently air-tight pneumatic tubes arranged inside one another,
the outer tube being designed to take the wear and tear, and each tube being
adapted to be inflated independently of the others, substantially as and for the
purposes herein before set forth.
2. In a pneumatio tyre; an outer tube rendered-air-tight by means substan-
tially as described with reference to Figure 1 of the accompanying drawings,
whereby said outer tube may be used either as an air-tube or as a protecting tyre
for the inner air-tube.
3. In a pneumatic tyre: the combination with two or more independently air-
tight pneumatio tubes arranged inside one another, of a valved nipple having
separate valved passages communicating respectively with each of said tubes
independently, whereby said tubes may be separately inflated for use singly,
successively or collectively, substantially as described.
4. The construction of multiple valved nipple for pneumatic tyres having two
or more independently inflatable air-tight pneumatic tubes, substantially as
described with reference to Figures 1 and 1 of the accompanying drawings.
5. The general construction and combination of parts taken as a whole, forming
the improved multiple tube pneumatic tyre and multiple valve substantially as
described and illustrated.
Dated th: oil 1
2 T
1009
25
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.