Year: 1896

page_text: Date of Application, 29th Oct., 1896
Complete Specification Left, 29th July, 1897-Accepted, 4th Sept., 1897
If I wish to obtain air chambers without a transverse join and even without the
longitudinal slit which I have noted in Chamber A I can employ a special mandrel
which I will now describe.
This mandrel is made with linen arranged so as to form a circular tube A. B. Fig. 2
with a circumference equal to that of the air chamber which I wish to obtain. I fill
this tube with very dry sand or any other suitable substance powdered or in fragments.
Then I bring the two ends of the tube A and B together so as to form a regular ring.
It is on this ring that I place the india rubber sheet which is to finally become the
air chamber. This sheet is then vulcanised in the ordinary way; after this I make a
small opening at C (Fig. 3). By this small opening I let out the sand contained in
the linen tube; then by the same opening I withdraw the linen tube. In this way I
obtain an air chamber without any join at all; the hole which has served to withdraw
the sand and the linen tube will mark the position of the valve. If I want now to
make this air chamber unpuncturable I cement occluding fabric on the outside of
instead of within this chamber and cover it with a strip of india rubber in order to
strengthen it and make it look neat.

page_text: CHAMBER
To make this junction I simply form the air chamber in such a way that the
female end carries interiorly a thin lip of rubber which is arranged with its free end
directed towards the interior of the chamber at E Figure 4. When the join is made
the extremity D of the air chamber adapts itself at E upon the free part of the
thin lip.
It results that the junction being free in the interior of the air chamber it will
not heat as an ordinary junction does, and is in no danger of being broken or pulled
apart.
D
1000
Improvements in the Air Chambers of Pneumatic Tyres for Wheels
of Motor Cars and other Vehicles,
ELLIS ASHMEAD BARTLETT, of 6 Grosvenor Street, in the County of London,
Knight, Member of Parliament, do hereby declare the nature of this invention
(which has been communicated to me from abroad by Pierre Mercier, of 81 Rue
Lemercier, Paris, France, Esquire,) and in what manner the same is to be
performed to be particularly described and ascertained in and by the following
statement :-
Pneumatic tyres for the wheels of motor cars and other vehicles running at high
speed turn (or slip) very easily around the rim and moreover heat to such a degree
that the heat is very sensible to the touch of the hand.
In these circumstances the junction of the air chamber also heats and being drawn
by the tyre in turning may be torn.
To avoid this accident I make air chambers without any transverse join as
described in Examples A and B or air chambers as described in Example C having a
free junction floating within the air chamber so that it cannot become heated by
contact and consequently will not come uncemented.
CHAMBER A.
To make air chambers without transverse joins I employ the following means.
take a metal hoop of the same form in cross section as the interior of the air chamber
to be produced and on the endless hoop a b c Figure 1 of the drawings left with the
Provisional Specification I place a suitable layer of sulphured rubber. I vulcanize
the rubber, then the air chainber being thus made without join I withdraw the
mandril by making a longitudinal slit around the chamber-this slit I make on the
inner side of the inandril upon the line def. I afterwards close this slit with
a strip of rubber and thus obtain an air chamber without any transverse join liable to
be torn.
CHAMBER B.
If I wish to obtain air chambers without a transverse join and even without the
longitudinal slit which I have noted in Chamber A I can employ a special mandril
which I will now describe.
This mandril is made with linen arranged so as to form a circular tube A, B,
Figure 2 with a circumference equal to that of the air chamber which I wish to

page_text: or in fragments. Then I bring the two ends of the tube A and B together so as to
form a regular ring. It is on this ring that I place the india rubber sheet which is
to finally become the air chamber. This sheet is then vulcanized in the ordinary
way; after this I make a small opening at C (Figure 3). By this small opening I let
out the sand contained in the linen tube; then by the same opening I withdraw the
linen tube. In this way I obtain an air chamber without any join at all; the hole
which has served to withdraw the sand and the linen tube will mark the position of
the valve. If I want now to make this air chamber unpuncturable I cement occluding
fabric on the outside of instead of within this chamber and cover it with a strip of
india rubber in order to strengthen it and make it look neat,
CHAMBER C.
To make this junction I simply form the air chamber in such a way that the
female end carries interiorly a thin lip of rubber which is arranged with its free end
directed towards the interior of the chamber at E Figure 4. When the join is made
in the ordinary manner the extremity D of the air chamber adapts itself at E upon
the free part of the thin lip.
It results that the junction being free within and out of contact with the interior
of the air chamber it will not heat as an ordinary junction does, and is in no danger of
being broken or pulled apart.
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. A vulcanized rubber air chamber for a pneumatic tyre formed without any
transverse join.
2. The manufacture of vulcanized rubber air chambers for pneumatic tyres without
any transverse join substantially as hereinbefore described in Example A.
3. The manufacture of vulcanized rubber air chambers for pneumatic tyres without
any transverse join substantially as herein before described in Example B.
4. A vulcanized rubber air chamber for a pneumatic tyre formed from a tube of
vulcanized rubber joined end to end and having the join free within the interior of
the air chamber substantially as described in Example C.
Dated this 29th day of July 1897.
CARPMAEL & Co.,
Agents for the Applicant.