Improvements in and relating to Pneumatic Tyres.
Year: 1899

page_text: Date of Application, 15th Sept., 1899-Accepted, 11th Nov., 1899
Improvements in and relating to Pneumatic Tyres.
I, ALFRED JUNOD, of St. Croix, in the Republic of Switzerland, Manufacturer,
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 invention consists of an improved construction of pneumatic tyre intended
to prevent the complete deflating of the tyre when injured by a perforation caused
by a nail or other sharp object.
This is obtained by combining the usual continuous air-chamber with a
supplementary, divided air-chamber formed of several inflated balls of any
suitable form or size whatever and with a circular band or circle of steel,
aluminium, celluloid or other suitable material not easily pierced by a nail or
other sharp object, and which is inserted between the said continuous air-chamber
and the divided air-chamber, the whole being inserted within the usual cover or
coating surrounding the tyre.
There may be moreover inserted in the said cover or coating an intermediate
membrane placed between the said continuous air-chamber and the band of steel
or other hard material and intended to maintain the said continuous air-chamber
in its right place or position within the tyre.
To enable the invention to be better understood, I will describe the same with
reference to the accompanying drawing which shows by way of example, one form
of execution of the invention.
Figure 1 is a longitudinal section of a portion of a pneumatic tyre constructed
according to my invention, and
Figure 2 is a cross section of the said pneumatic tyre on the line A-B of
Figure 1.
In these drawings 2 are the spokes, and 3 is the rim of the wheel, 7 is the
outer cover of the pneumatic tyre, the said cover being of any of the well-known
constructions.
Within the said cover 7, there is located a continuous air-chamber 4 which may
also be of any well-known construction and which is arranged adjacent to the
rim 3.
Surrounding the said air-chamber 4 there is arranged a circle or circular band
of steel, aluminium. celluloid or other suitable material 9 and around this band
is arranged a circular series of inflated balls. 6, the whole being enclosed by the
usual cover 7.
Thus the nails or other sharp objects which may pierce the said cover 7 cannot
injure the continuous air-chamber 4 without first piercing one of the balls G and
also the shield of hard material 9.
There may further be provided a membrane 8, formed of a flexible material
and fixed to the inner walls of the cover 7 with the object of exactly maintaining
the air-chamber 4 in its place, and the separate balls 6 may furthermore be inserted
within a hose 5 with a view of facilitating the mounting of the whole tyre.
I am aware that pneumatic tyres have already been constructed with divided

page_text: air-chambers formed of several inflated balls but what I desire to protect is the
combination of such divided air-chamber with a continuous air-chamber and with
a shield of hard material inserted between the said two air-chambers.
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. In pneumatic tyres the combination of a continuous air-chamber of usual
construction with a circular shield of hard material surrounding the said con-
tinuous air-chamber and with a series of inflated balls forming a divided air-
chamber surrounding the said circular shield, the whole being surrounded by a
cover of the usual construction.
2. In pneumatic tyres the combination of a cover 7 of any suitable construction
with a circular membrane 8 of flexible material having its edges fixed to the
inner walls of the said cover 7, a continuous air-chamber 4 being inserted in the
said cover 7 underneath the said membrane 8 and the chamber formed by the
said membrane 8 and the upper portion of the cover 7 containing a circle of hard
material 9 and a hose 5 in which are arranged a number of inflated balls 6,
substantially as and for the purpose specified.
Dated this 15th day of September 1899.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.
Agents for the Applicant.