Improvements relating to Pneumatic Tyres.
Year: 1897

page_text: Date of Application, 9th Mar., 1897
Complete Specification Loft 8th Jan 1828 Accepted 12th Feh
1808
Improvements relating to Pneumatic Tyres.
I, WILLIAM HENRY WALLIS, of 2, Chiltern View Road, Uxbridge, in the County
of Middlesex, Solicitor's Clerk, do hereby declare the nature of this invention to
be as follows:-
My invention has for its object to construct, in an improved manner, a tyre so
that the liability of the inflation chamber to become punctured shall be reduced to
a minimum and so that even should the tread of the tyre become cut through no
serious inconveniences will arise; to render a worn-out, cut or damaged tread
easily renewable or replaceable; to form the tyre so that it shall not be liable to
flatten or spread out when in use; and generally to effect the improvements herein-
after indicated.
According to my invention the main chamber of the tyre, which may be inflated
under pressure through any suitable valvular device, is composed of rubber with a
covering or partial covering or insertion of canvas, and such main chamber may
either be in the form of a separate tube or it may form the innermost surface of a
hose-pipe tyre. Wholly or partially enveloping the tube thus formed is a rubber
or other suitable covering which at its tread portion is formed or moulded somewhat
angular or oval in transverse section. In order to assist in preserving the said con-
formation the tread portion has a lining of textile fabric and a strip of the same
or similar textile fabric is fastened from side to side of the tyre forming a strut
or support between such sides. The main chamber of the tyre is approximately
circular in transverse section. This method of construction allows, when the parts
are secured together, of a hollow space containing air at atmospheric pressure being
formed between the inflated chamber and the tread. In the case of a tyre compris-
ing an independent air tube and a detachable cover, the air tube may be composed
of rubber only and the cover may be a compound one. That is to say the textile
lining and a comparatively thin covering of rubber may be vulcanized or cemented
together and this part, arch shaped in transverse section, is, in turn, vulcanized or
cemented to the outer layer of rubber or rubber with a lining of canvas with its
angular or oval tread.
In this way not only is the liability of puncturing the air receptacle materially
lessened and a compound "cushion" and "pneumatic" tyre produced, but the
textile fabric sustains the walls of the cushioning chamber and pressure of inflation
at the tread portion of the tyre tends to depress or render arch-shaped the strut
or support of textile fabric adjacent to the cushioning chamber and thus to nip in
the sides of the tyre and prevent it from spreading and from presenting a wide
tread when weight is put upon it.
The rubber forming the exterior surface of the tyre may be in two or other
number of strips so that should the tread become cut or worn that part may be
stripped off and another one substituted.
By placing a lining of rubber within that part of the tyre which has been
described as the cover, and by providing means for the obtaining of an air-seal
.

page_text: wheel rim may be provided. Figure 2 shows a core D at each edge of the cover B
for that purpose.
The rubber forming the exterior surface of the tyre may be made in two or other
number of strips c and d so that should the tread become cut or worn the part d
may be stripped off and another one substituted.
C
I am aware that it has been before proposed to construct a tyre with a main
inflatable chamber and a tread of rubber having a pipe, channel or passage running
through it. I do not claim that as my invention. In such cases however there has
been a considerable thickness of rubber between the base of such pipe, channel
or passage and the inflated chamber and that operated to materially "deaden" the
tyre; further, the pipe, channel or passage has not been lined with textile fabric
in such a way as, aided by inflation of the main chamber, to give it support and
resiliency and to prevent the tyre from spreading in the manner hereinbefore
described.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is:-
-
1. The combination, with the inflatable chamber of a pneumatic tyre, of a cover
angular or oval in transverse section at its tread portion, a lining or sustaining
thickness of textile fabric, and a strut or support of textile fabric fastened to each
bide of the cover substantially as set forth.
2. In a pneumatic tyre, the combination of a main chamber inflated under pres-
sure, a cover angular or oval in transverse section at its tread portion provided with
a lining or sustaining thickness of textile fabric, and a strut or support of textile
fabric fastened to each side of the cover whereby upon inflation of the main chamber
the said strut or support is rendered arch shaped and the sides of the tyre nipped in
so that a narrow tread is maintained and a compound cushion and pneumatic tyre
produced substantially as set forth.
3. In a pneumatic tyre the combination, with an inflatable chamber, of a cover
comprising a textile lining a¹, a covering a³ of rubber, a tread B of rubber with a
lining or sustaining thickness 6 of textile fabric, and a strut or support 61 attached
to each side of the tread B and whereby a cushioning chamber C is formed in
such tyre substantially as set forth.
4. In a composite pneumatic and cushion tyre an exterior surface of rubber
formed of a plurality of parts c, d, so that upon the tread becoming cut or worn that
part may be stripped off and another one substituted substantially as set forth.
5. The improvements relating to pneumatic tyres substantially as set forth and as
illustrated in the accompanying drawings.
1000
A. F. SPOONER,
323, High Holborn, London, Agent for the Applicant.