Improvement in Elastic Tyres for Autocars and other Vehicles.
Year: 1899

page_text: Date of Application, 25th Nov., 1899-Accepted, 23rd June, 1900
COMPLETE SPECIFICATION.
Improvement in Elastic Tyres for Autocars and other Vehicles.
I, ALFRED DUCASBLE, of 23, Rue Dussourd, Asnières (Seine), France, Gentleman,
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:-
-
The present invention has for its object a hollow tyre for autocar and other
vehicle wheels. It is so constructed that the tread thereof always has an
invariable width, whatever may be the weight which the tyre may have to carry;
that the tyre offers a maximum resistance for a minimum volume and weight,"
and that it offers great resistance against side slipping.
The annexed drawing is a cross section of a hollow tyre made according to
my invention.
This tyre consists, as shown, of a band or ring a made of rubber or other
suitable material, having an interior chamber or space b of any suitable shape,
and placed nearer to the base than the tread. The section of the tyre assumes,
as shown, an irregular hexagonal form, that to say the tread c which comes in
contact with the ground is flat and is of a width less than the base d which rests
upon the rim (not shown) of the wheel. From the base d project, perpendicularly
thereto, the vertical sides e e which are connected with the tread c by two oblique
parts or abutments f f.
The inclination of the abutments f f with regard to the vertical line is so
calculated as to give a maximum resistance for a minimum of volume and weight
of the tyre. The said inclination will, besides, have the great effect of presenting
a great resistance against side slipping. The angle which each abutment f makes
with the adjacent side e is approximately 150°.
It will be readily seen upon examining the drawing, that the tread c, that is
to say the friction face, will, furthermore, retain an invariable width, whatever
may be the weight the tyre may have to carry, as, the bending of the tyre taking
place on the lateral oblique parts ƒ ƒ, they will, under pressure, undergo a swell-
ing (as indicated in dotted lines in the drawing), but without coming in contact
with the ground.
It will also be understood that the tyre may be closed all around the inner
space b, as shown in full lines, or that it may be open along its inner periphery,
at the middle of the base d, as indicated by
in dotted lines.
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 elastic tyre for vehicles having parallel horizontal faces c d constituting
the tread and base of the tyre, said face c being of less width ihan said base,
parallel vertical sides e and sides f converging from said sides e to the tread, said

page_text: tyre provided with a circular arched chamber b nearer to the base than the tread
substantially as and for the purpose set forth.
2. An elastic tyre for vehicles constructed as herein described and shown.
Dated this 25th day of November 1899.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.