Improvements in Elastic Tyres.
Year: 1895

page_text: Improvements in Elastic Tyres.
I BERTHOLD DIAMANT, of Bruck, Stiria in the Empire of Austria,
Manufactory Proprietor, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained by the following statement :-
The improvements in tyres are represented in the annexed drawings in different
forms, and relate to that class of tyre, for which an elastic, hollow, closed tube,
filled with compressed air, is used.
narrow.
inserted.
Of great importance in this improved construction is the fact, that the cross
section of the tyres is not circular, but eggshaped, which has the advantage of
giving a greater quantity of air space, also that the upper surface becomes very
In order to prevent the flat side surfaces from bulging, a cross piece is
Fig. 2 shows the simplest form, in which the tyre A is, by a cross piece of rubber
which runs all around, divided into two pipelike chambers B and C, an arrangement
which prevents A from bulging. In order to save material and to have a tyre as
light as possible, the parts a are cut out. As it is necessary to let the whole retain
the characteristic of one single hollow space, the cross piece has an aperture D, by
means of which the chambers B and C communicate with each other. The com-
pressed air thus acts principally in the direction of the longer diameter of the cross
section, so that the upper surface of the tyre becomes as narrow as possible. The
inflation of the tyre is effected by means of an air pump attached to the broad base.
In Fig. 3 the interior of the tyre contains a separate, very thin, elastic air tube F,
which is loosely fitted in, and which, forming the hollow_space C, again com-
municates with the other space B by means of an aperture D. To insert the air
tube F, the broad base below has been slit.
In the tyres as represented in Fig. 4, both parts B and C have air tubes inserted.
In order to have this done, the base of the tyre is slit, and the cross piece fis
formed of two parts which engage one within the other swallow-tail like.
It is to
be understood that the tyre, especially that of the latter construction, can be
strengthened by inserting suitable textures. In the Fig. 2 for instance the upper
space is intended to be filled in with any suitable, solid, resistible material, such as
celluloid, steel etc.
As arranged in Fig. 1, the egg shaped tyre A, which at its lower end is slit, has
an attachment consisting of the cross piece proper H of inelastic material, and
firmly connected thereto parts of very thin, elastic tubes, as indicated on the
drawing Fig. 1 in heavy black lines. If this cross piece is inserted and the tyre
inflated, it (the tyre) expands only as far as these black lines go, so that the egg
shaped section of the tyre remains.
In order to secure between each other an airtight connection of the two thin air
pipes, marked in heavy black lines in Fig. 4, and also to secure an air tight
connection between the chamber B and the tube F, as shown in Fig. 3, the
aperture D of the cross piece is provided with a small pipe with winged nut
(Fig. 6) and washer; Fig. 6 exactly corresponds with the form in Fig. 3. Instead
of this small pipe a valve (Fig. 5) can, in all four instances, be attached at D,
which permits the air to pass from C to B, when the tyre is being inflated, and
which on the other hand, prevents the air from re-entering (passing back), when
the tyre is pressed down. These valves should, in Figs. 1 and 4, likewise be

page_text: represented as opening inward, which would, in taking apart the tyre and letting
out air of the chamber C, preveut the air pipe in the chamber B from being torn,
as here the air cannot escape from B through the above mentioned valve.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :
1. Pneumatic wheel tyres having an egg shaped cross section divided into two
chambers by means of an interior cross piece or diaphragm running all around, and
containing an aperture and valve allowing of air communication.
2. A wheel tyre with a cross piece consisting of two parts, which are each
fastened to the inner walls, and capable of engaging one with the other.
All substantially as illustrated and described for the purposes set forth.
Dated this 9th day of March 1895.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, Agents for Applicant.