Improvements in Pneumatic Tyres for Velocipedes and other Road Vehicles.
Year: 1896

page_text: Date of Application, 11th June, 1896
Complete Specification Left, 11th Mar., 1897-Accepted, 15th May, 1897
PROVISIONAL SPECIFICATION.
Improvements in Pneumatic Tyres for Velocipedes and other Road
Vehicles.
We ROSE ASHCROFT 13 Stratford Avenue Highgate Birmingham and ESTHER
ABIGAIL STURGESS 13 Stratford Avenue Highgate Birmingham in the County of
Birmingham, Register Office for Servants do hereby declare the nature of this.
invention to be as follows:-
This invention is designed to provide a puncture proof and an elastic tyre for the
wheels of cycles and the like and other vehicle wheels.
It consists of two tubes side by side and running longitudinally in endless form and
coupled together forming twin tubes, each fitted with a ball valve, or union valve fixed!
in a suitable position to inflate the same with air, as desired, the space between the
one tube and the other, to be leveled up with sections of cork or other suitable
substances such as fibrous, metallic, horny, or india-rubber, either of the substances.
referred to, to cover a part or the whole of the periphery surface of the tubes, so as to
protect them against puncture. To carry out the invention, we construct the tubes.
from strip rubber sheet material or composition the side edges of which we roll inward
curling to the right and to the left thus forming twin tubes and cement or otherwise
fasten them in their respective position, adhesive fibrous overlay strips may be used
capable of expanding necessarily of an air tight character.
In the production of these sheet strips, at a suitable distance from the edge greater
solidity should be formed with layers, preferably three, occupying about the centre
position, when the sheet strip is rolled to form the twin tubes as desired, the stouter
substance should still occupy the middle, and spread over the inside periphery of the
tubes forming a ridge between the two rolls, and coming in contact with the ground is
subjected to greater friction, at the same time reducing the liability of puncture to the
tubes to a minimum, and wear and tear. We propose that the middle layer referred
to, (part forming the ridge,) should be composed of felt or some fibrous substance,
stretchy and elastic by nature.
In the manufacture of the strip material of which the tubes are to be composed
should naturally curl towards the middle, the edges of which curl inwardly forms two
rolls longitudinally, a composition can be used instead of pure india rubber if so desired,
or for any of the former materials if suitable for the purpose.
To make the twin tubes endless, as a tyre, we insert the one end into the other
respectively and cement them together, or apply overlays and make them perfectly
air tight, in joining each tube it may be necessary to remove a portion of the
connecting rubber at one end that the opposite end may slide on over to form male
and female tubes.
Oil J of Iona 1806
ROSE ASHCROFT.
ESTHER ABIGAIL STURGESS.

page_text: COMPLETE SPECIFICATION.
Improvements in Pneumatic Tyres for Velocipedes and other Road.
Vehicles.
We, ROSE ASHCROFT Mrs. of 13 Stratford Avenue Highgate Birmingham in the
County of Warwick and ESTHER ABIGAIL STURGESS Mrs. of 13 Stratford Avenue
Highgate Birmingham in the county aforesaid 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 :-
This invention consists in the construction of that form of pneumatic tyre known as
double or twin tube tyres and for this purpose we use an annular band or strip of
rubber (or rubber in combination with other materials) the edges of this band or strip
being capable of being turned inwards so as to form twin tubes.
Along the middle of this strip there is fixed a projecting rib, which in cross
is T shape the bottom of the T being fixed to the strip. The sides of the strip, when
folded in so as to form the tubes, lie along each side of the body of the T shaped rib.
When the tubes thus formed are inflated they constitute two separate chambers and
therefore if one of the tubes should be punctured the other one will perform the
function of a tyre and support the rider.
In order that our invention may be more clearly understood we will describe it by
reference to the accompanying drawings the same letters of reference indicating similar
parts throughout.
Figure 1 represents in cross section a portion of the band or strip and Figure 2
is a side elevation of the same.
Figure 3 shows in cross section the strip partly folded or bent into shape for
adjusting on the rim.
Figures 4 and 5 show in cross section and in part cross section the tyre fixed
in its place.
Figures 6, 7, and 8 are modifications of our improved tyre.
In Figure 1, A represents the tread of the tyre B' and B2 the edges of the strip
turned inward as shown and made preferably of soft pliable rubber. D' and D' are
two narrow flaps for facilitating the adjustment of the strip on the rim of the wheel.
E is the projecting rib fixed along the middle of the strip. F represents the cross
piece forming the seat or support for the tyre when attached to the rim of the wheel.
In Figure 3 is shown the manner in which the strip is attached, the cross piece F
being cemented or otherwise attached to the rim G: the sides are folded into the
position illustrated, the bent parts H1 H2 are fitted into the angles of the T, and the
Haps B B are forced against the inside of the tread and the sides of the rib E thus
forming two tubes as illustrated in Figures 4 and 5, the flaps D1 D2 clipping the rim
and holding the tyre in its place.
In Figure 8 the cross piece F is made flush with the outer circumference of the
tyre by forming recesses L L in the strip. This arrangement admits of the tyre being
attached to the ordinary form of cresent rim. The sides of the tyre may be further
secured to the cross piece by means of wire loops engaging with hooks N.
Figures 6 and 7 show a further modification in which the cross piece F is tapered
down to the edge O, and the loops M attached thereto. The adjustinent of this form
of tyre is the saine as in those already described. Each tube may have a separate
valve or one valve may be arranged to supply both tubes.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is:-
A pneumatic tyre formed from a flexible band or strip of india rubber or other

page_text: suitable material by folding or bending the same to form two tubes these tubes
having a projecting rib between them substantially as described and illustrated in the
accompanying drawings.
Dated this 9th day of March 1897
WILLIAM HENRY BARACLOUGH,
36, Temple Street, Birmingham, Agent for the Applicants.