Puncture-proof covering for Pneumatic Tyres.
Year: 1896

page_text: Date of Application, 19th May, 1895-Accepted, 8th Aug., 1896
COMPLETE SPECIFICATION.
Puncture-proof covering for Pneumatic Tyres.
I, CHARLES WALTER HAZELTINE, of Bank of Commerce Buildings St. Louis,
Missouri, United States of America, 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:-
The object of my invention is to provide a puncture-proof covering for pneumatic
tyres which will not interfere with the resiliency or rebound of the pneumatic tyre
and its running qualities, and which will not be bulky or add materially to the weight
of the tyre.
raised
It has hitherto been proposed to provide puncture-proof coverings for pneumatic
tyres consisting of woven and unwoven fibrous material placed in the tread of the
tyre. I have found that such protective coverings either interfere with the running
qualities of the wheel and resiliency of the tyre, or are bulky and add materially to
the weight of the tyre. Such puncture proof coverings are taut all around the
circumference when the tyre is inflated and not in use. When, however, the tyre
is in use, the weight sustained by the tyre, causes the part making contact with the
ground to be flattened, and this makes the puncture-proof covering bulge or buckle,
destroying the circumstantial smoothness of said covering. This causes
loose place in the puncture-proof covering at the front of the wheel in contact with
the ground, and makes a lumpy place in the tyre over which the rider is continually
riding. This interferes with the running qualities of the wheel, inasmuch as the
part of the tyre in contact with the ground does not present a smooth unbroken
surface. My invention in carrying out this object consists in furnishing a pneumatic
tyre with a puncture-proof covering having inserted transversely across the same,
elastic material, so that such elastic material will take up the circumferential slack in
the puncture-proof covering when in use, whereby a smooth running surface is
presented to the ground and the running qualities of the wheel are the same as with
the ordinary rubber pneumatic tyre.
Fig. 1 is a view of a portion of a puncture-proof covering for pneumatic tyres
made in accordance with one form of my invention, the same being developed or
rolled out flat. Fig. 2 is a cross-section of a pneumatic tyre provided with a puncture-
proof covering and showing how the puncture-proof covering is attached to the rim of
the wheel. Fig. 3 is a central section, taken in the plane of the wheel, of a portion of
a pneumatic tyre and rim of a wheel provided with my puncture-proof covering.
The same marks of reference indicate the same parts in the different figures of
the drawing. 5 is some suitable flexible envelope, which may consist of canvas,
rubber, rubber duck or other similar material, but is best made of some elastic
material. 6 is some suitable flexible material which is relied upon to protect the
tyre against puncture. This is best composed of a number of layers of woven fibrous
material, such as cotton, canvas, linen or the like, and is applied over the tread of
the tyre. About four layers of ordinary woven cotton will suffice. The material 6
is made in sections circumferentially, of about six inches in length, and the ends of
the adjoining sections are fastened together by elastic strips 7, preferably of rubber,
so as to take up any slack in the protective covering when the tyre is in use.
This elastic material is preferably inserted in the individual folds or layers of the
flexible material 6, and the ends thereof left projecting beyond the woven fibrous
material, which projecting ends are cemented to the tyre so as to hold the fibrous
material in place on the tyre. 8 is the pneumatic rubber tyre and 9 the rim of the

page_text: wheel. The edges of the envelope 5 are cemented or otherwise fastened in place
between the tyre and the rim 9. Other means of attaching the protective covering
to the rim or tyre may be employed without departing from my invention.
A tyre provided with such a protective covering always presents a smooth running
surface to the ground, and therefore does not interfere with the running qualities of
the wheel. The resiliency of a pneumatic tyre provided with such a protective
covering is substantially the same as when no protective covering is used. The strips
of rubber by giving circumferential elasticity to the protective covering also prevent
the protective covering from interfering with the elasticity or rebound of the tyre,
while the elastic envelope permits the tyre to have lateral or transverse elasticity and
the rebound of the tyre is not interfered with by the covering which is inextensible
laterally over the tyre. It will be obvious that the same result as regards lateral
elasticity or rebound may be imparted to the puncture-proof covering by elastic
strips circumferentially inserted in the woven material 6.
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. A puncture-proof covering for pneumatic tyres made in sections, and having
strips of elastic material joining the sections, substantially as and for the purpose
sct forth.
2. A puncture-proof covering for pneumatic tyres, composed circumferentially of
sections of layers of woven fibrous material arranged over the tread thereof, and
having strips of rubber joining the sections, substantially as and for the purpose set
forth.
3. A puncture proof covering for pneumatic tyres composed circumferentially of
sections of layers of woven fibrous material arranged over the tread thereof, and
having strips of rubber joining the sections, with an elastic envelope therefor, whose
edges are secured to the rim.
Dated this 19th day of May 1896
F. WISE HOWARTH,
46, Lincoln's Inn Fields, London, W.C., Applicant's Agent.