Improvements in Pneumatic Tyres.
Year: 1893

page_text: Date of Application, 17th Nov., 1893
Complete Specification Left, 17th Aug., 1894-Accepted, 22nd Sept., 1894
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres.
ALEXANDER NICHOLSON 52 Mary Street Dublin Engineer do hereby declare
the nature of this invention to be as follows:-
My invention relates to improved means of wiring on pneumatic tyres to the
rims of wheels. For this purpose I provide what is known as the outer cover with
a double edge at each side, said edges to be formed with a casing or passage
carrying a wire or other band of sufficient circumference to pass easily over the
edge of the rim, which can be either shallow or deep, thus providing two bands for
each side of the tyre. Or instead of the double edge above mentioned two suitably
Said
arranged casings or passages are formed at or near the edge of the cover.
bands can be either separate rings, or both formed of one continuous length of
material, and can have their ends either joined solid, or have a suitable coupling
for adjusting the length if desired.
The important feature of this invention consists in having the casings or passages
in which the wires are placed, so arranged eccentric in the cover, that when the tyre is
placed in position, and inflated, the rings or bands are drawn eccentric with each
other, in opposite directions, thus securing the cover to the rim, and when desired
to detach, it is only necessary to move the rings concentric with each other, and
remove them from the rim, or remove them one by one.
If desired only one side of the cover may be so fitted, the opposite side being
secured to the rim by a single band of wire, or other suitable means.
Dated this 16th day of November 189.
Improvements in Pneumatic Tyres.
I ALEXANDER NICHOLSON 52 Mary Street Dublin Engineer, 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:-
In the Specification and drawings of my invention No. 22000 1893 immediately
preceding I have shown and described a method of using expansible and contractable
wire bands arranged in connection with the cover of a pneumatic tyre, to make the
tyre automatically contract by the pressure of the compressed air in the tyre, and
attach itself to the wheel rim.
This my present invention is designed to accomplish a similar purpose, but instead
of using expansible and contractable bands I use bands of a fixed size or circum-
ference so arranged in each side or edge of the cover, as to be capable of being
moved eccentric or concentric with each other.
In the accompanying sheet of drawings
Fig. 1 shows a perspective view of a canvas rubber-protected cover of a
pneumatic tyre, arranged and constructed according to this invention, with a portion
at each side removed to show the arrangement of the wires.
By referrig to the drawing it will be seen that the cover a is constructed with
two annular casings or passages b and c at each side, by folding back the edges of
The folds should be sewn
two strips of canvas, as shown in cross section in Fig. 2.

page_text: or cemented or vulcanized to form the passages in which are placed the two wire
rings shown in Fig. 3.
The important feature of this invention consists, in having the passages for the
wires formed eccentric with each other in the edges of the cover, which can be done
by allowing the looped edges of the strips of canvas of which the cover is
constructed, to project beyond each other the desired amount for half their circum-
ference, at opposite sides of their circumference. Or by having the looped edge of
one strip to project the desired amount beyond the edge of the other strip, an equal
distance all round the circumference of the edge of the cover, and providing two
openings in the outer passage of the cover, at two diametrically opposite points in
their circumference, where the rings cross each other as shown at d, d, in the
drawings. Through these openings the wire rings pass from one channel to the
other, thus half of each ring lies in half of each channel of the cover, both rings
being eccentric with each other, and each passage which contains each ring eccentric
with each other.
It will of course be readily understood that when the tyre is inflated in position
on the wheel rim, the wire rings will be drawn and held eccentric with each other,
by the tension of the canvas, caused by the pressure of the compressed air in the
tyre, thereby contracting the circumference of the edge of the cover on to the wheel
And when the tyre is deflated, the cover being flexible, offers little resistance
to the wire rings being pushed or drawn concentric with each other, thereby
expanding the circumference of the edges of the tyre cover, sufficiently to allow of
its being easily removed from the rim.
rim.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :
1. In a pneumatic tyre, securing the tyre or cover to the wheel rim, by means of
wire, or other inexpansible bands, arranged in connection with the cover, so as to
automatically contract the tyre or cover into and upon the wheel rim, by the
pressure of the compressed air in the tyre, substantially as described with reference
to the drawings.
2. For securing pneumatic tyres to wheels, the combination of wire or other
rings, arranged eccentric with each other, in casings or passages on the edges or
sides of the tyre, capable of being moved concentric or eccentric with each other,
thereby expanding and contracting the tyre upon the rim substantially as described
with reference to the drawings.
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3. The improved construction of pneumatic tyres as herein described with
reference to the drawings.
Dated this 16th day of August 1894.
ALEXANDER NICHOLSON.