Improvements in the Manufacture of Elastic Rubber Tires and similar Rubber Articles.
Year: 1896

page_text: Date of Application, 25th June, 1896-Accepted, 5th Sept., 1895
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Elastic Rubber Tires and
similar Rubber Articles.
I, JOSEPH HÜBNER, of Victoriastrasse 19, Linden-Hannover, in the Empire
of Germany, Merchant, 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 the production of rubber tires, intended to be used
instead of the tires filled with compressed air. The latter have as is well known
the inconvenience that by a slight injury they may become suddenly useless; also
the inner pressure of the air is not permanent and the tires lose their elasticity. It
has been tried to prevent these inconveniences by dividing the inner hollow space
into several chambers running concentrically which have no connection between, or
by making the tires with many small cell-like hollow spaces; also it has been tried
to use tires the inner core of which consists of porous rubber.
In the annexed drawing Figs. 1-5 represent the different parts used for such
a tire, as well as the manner in which they are successively connected together:
Fig. 6 is a cross section of the vulcanizing mould and Fig. 7 is a cross section of
a finished tire thus produced.
According to this process a ring A is produced of a rubber mass mixed with a
carbonate of ammonia or any other suitable fermenting or gas producing means and
the inner side of this ring A is covered with a layer B of prepared or rubber coated
stuff. Then the exterior side is provided with a covering C of stuff (cotton or hemp
fabric) on the outside of which is a layer of vulcanized caoutchouc D, which in the
middle at E is especially made thicker: over the inner edges of part D is then put
a band F of rubber coated fabric which may be provided on the edges, with
swellings for fixing the tire to the rim of the wheel or the covering can be
smooth or of any cross section.
The thus coated rubber ring is placed in a mould G which in its cross section
corresponds completely to that of the ring and after having tightly fixed the cover H
the mould is heated and the vulcanizing is thus effected.
The gases developed during the vulcanizing swell the inner rubber core up,
render it porous and give it the necessary elastic qualities: as however the volume
of the porous ring cannot change on account of the exterior fabric covering and of the
mould tightly enclosing the tire during manufacture the inner spongy_core presses
upon the surrounding covering, with the parts of which it is connected completely
together this pressure also does not cease when the finished tire after cooling of
the mould is taken out of the latter.
The invention is similarly applicable to the manufacture of rubber bodies
of other form.
Having now particularly described and ascertained the nature of this said inven-
tion and in what mauner the same is to be performed I declare that what I
claim is :-
The method of manufacturing a cycle tire or similar elastic rubber bodies by
forming a core, which during the vulcanizing becomes spongy rubber surrounding
the same with a prepared or rubber coated fabric which latter is then provided

page_text: with an exterior covering of non-porous rubber and vulcanizing the whole in a
mould which tightly encloses the thus produced tire or body.
Dated this 25th day of June 1896.
HERBERT HADDAN & Co.,
18 Buckingham Street, Strand, London, W.C., Agents for Applicant.