Improvements in the Construction or Production of Pneumatic Tyres.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Construction or Production of Pneumatic Tyres.
I, PATRICK ALPHONSUS MARTIN, a Managing Director of Martins-Birmingham
Limited, of Granville Street, in the City of Birmingham, do hereby declare the
nature of this invention to be as follows:-
This invention has reference to pneumatic tyres of that class in which the edges
of an endless band of rubber or the like which constitutes a tyre or the cover of
a tyre are provided with thickened edges or annular feet made of soft or pliable
material and which follow circumferentially the edges of the tyre to which they
are attached and are inserted within inverted and deep-troughed or hook-sectioned
annular channels formed around a wheel rim, with the circumferential and open
mouths of the said channels coming on the inner periphery of the rim, and to
which the engaged edges of the tyre are locked through the pull exerted by the
distension of the walls of the tyre on inflation.
My present invention relates to the production of the said tyres and consists in
making the annular foot coming at each edge of the cover, from a ring or circular
band of rubber or the like, which is cut out of a sheet of material on the flat.
The inner curved edge or periphery of the said band is of a like circumference
as the edge of the tyre to which it is attached, whilst the other or outer periphery
is of an increased circumference, corresponding with a circumference of the
part of the tyre to which this edge comes opposite.
When the tyre is off the rim and lying in transverse section on a slight camber,
then these attached ring-feet lie flat to the inside surface of the tyre, at and near
the edge of the same, but when the tyre is curved over into a nearly circular
figure, prior to its attachment to a rim, they then come parallel with one another
and make an acute angle with the opposite inner sides of the said tyre.
The deep ring feet thus form vertical flanges running around the edges of the
tyre and are placed into the deep channels at the edges of the rim, which have
their entrances presented to the inner periphery of the said rim.
The feet are preferably made of soft rubber or pliable material, provided with
plys or strips of canvas for their attachment to the body of the tyre, and should
they be made of such material as leather, the inside faces of the channels of the
rim may be faced with rubber.
The band of rubber or the like to form the attachment feet may be formed in
sections secured together in any suitable way.

page_text: are of increased diameter, equal to that of the part of the inner side of the tyre
with which they circumferentially coincide when attached.
When the tyre is off the rim and lying in transverse section on a slight camber,
then portions of these attached ring-feet admit of lying or being disposed at a
slight angle relative to the inside surface of the cover tyre, at and near the edge
of the same, but when the tyre is curved over into a nearly circular figure as
represented in Figures 1 and 5, prior to its attachment to a rim, they then come
parallel with one another and make an acute angle with the opposite inner sides
of the said tyre.
The deep ring feet thus form vertical flanges running around the edges of the
tyre and are placed into the deep channels at the edges of the rim, which have
their entrances presented to the inner periphery thereof.
The feet are preferably made of soft rubber or pliable material, provided with
plys or strips of canvas for their attachment to the body of the tyre; or they
may be attached by cement, solution or other means. They may also be made
of such material as thin steel or other metal, leather or the like, which keeps
the edging in shape or prevents collapsing and in this case I propose to enclose
or face the same with rubber, canvas or other suitable material, or as a further
alternative, the inner sides of the channels or annular seatings in the rim may be
faced with rubber in order to produce a sound air tight joint.
The flat ring of rubber or the like to form the foot edgings may be formed in
sections secured together in any suitable way.
Figure 7 represents, partly in section and partly in elevation, an attached ring
so made.
It consists of a number of sections b', of any material, either metal, leather
or the like, with the ends, of each sections secured to the contiguous ends of
the next adjacent sections either by rivettings as shown, or by other suitable
means, thereby producing a flexible and flat ring, which when made of steel or
leather, is enclosed in a cover or sack, such as c, preferably made of rubber or
canvas or like material the inner edge (of least diameter) of which will admit of
being attached to the body of the tyre.
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:—
In pneumatic tyres of the type herein referred to, making each of the attach-
ment flanges or feet thereof separate from the cover or tyre and in the form of
a flat ring or continuous and flat circlet, set up on edge so as to bring its broader
faces into the plane of the diameter, which said separate rings are attached to
the edges of a tyre or tyre cover, substantially as described and set forth.
Dated the 2nd day of January 1899.
PATRICK ALPHONSUS MARTIN.
By Henry Skerrett,
24, Temple Row, Birmingham, Agent for Applicant.