Improvements in Wheel Tyres for Cycles and other Vehicles, and in. Means for Securing the same to the Wheel Rims.
Year: 1889

page_text: Date of Application, 8th Mar., 1889
Complete Specification Left, 29th Nov., 1889-Accepted, 4th Jan., 1890
PROVISIONAL SPECIFICATION.
Improvements in Wheel Tyres for Cycles and other Vehicles, and in.
Means for Securing the same to the Wheel Rims.
I, JOHN BOYD DUNLOP, of 50 Gloucester Street, Belfast, Ireland, Veterinary
Surgeon, do hereby declare the nature of this invention to be as follows:-
In the specification of my Invention No. 10607 dated 23rd July 1888, I have
described a hollow tube tyre of india rubber inflated with air or gas under pressure,-
and surrounded with cloth, canvas or other suitablo material adapted to withstand
the internal pressure of the compressed air or gas contained within the hollow tube-
tyre aforesaid.
My present Invention is devised with a view to the better securing or fastening:
of said hollow tube tyre in position in the rim of the wheel of the cycle or other
vehicle to which my improvements are adapted.
In accordance with my Invention the hollow tube tyre for containing the air or
gas under pressure as described in the specification of my Invention of prior date
hereto, is composed of layers or folds of rubber and cloth or canvas or other
similar suitable material.
One of the folds or layers of cloth or canvas of said hollow tube tyre is made to
enclose or envelope the rim of the wheel and overlap on the inner surface of the
rim. Or, under certain conditions I may prefer to. employ when desired a strap of
canvas or cloth or other suitable material somewhat wider than the rim of the
wheel to the inner surface of which it is cemented, the edges of the canvas or cloth.
being united to the hollow tube tyre aforesaid.
Dated this 7th day of March 1889.
JAMES
STEVENSON,
Gray's Inn Chambers, 20, High Holborn, London, W.C., Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Wheel Tyres for Cycles and other Vehicles, and in.
Means for Securing the same to the Wheel Rims.
I, JOHN BOYD DUNLOP of 50 Gloucester Street, Belfast, Veterinary Surgeon,-
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 Specifications of Letters Patent granted to me, and dated the 23rd July
1888 No. 10607, I have described a hollow or tubular tyre of India rubber inflated
with air or gas under pressure, and surrounded with cloth, canvas or other suitable.
material to adapt it to withstand the internal pressure of the compressed air-
or gas.
My present Invention is designed to strengthen the said hollow or tubular tyre
and to ensure the securing or fastening of the same in position on the rim of the
wheel in a more efficient manner than heretofore.
In order that my Invention may be clearly understood, I have appended the-
accompanying sheet of Drawings illustrating in cross section, drawn to enlarged
scale, the improved tyre constructed in accordance with my present Invention and
the method of fastening same on the rim of the wheel.
In carrying my said Invention into practice I employ an external protective
covering A composed of a fold or layer of India-rubber which is thickened as shewn
at that portion which comes in contact with the ground. An internal tube B

page_text: preferably of india rubber contains the air or gas under pressure. C is the metallic
rim of the wheel which is preferably somewhat flattened as shewn to obtain a large
bearing surface. The metallic rim C is enveloped with a protective strip a, of
canvas or linen as shewn.
Strips D of caoutchouc or other elastic material are cemented or otherwise secured
to the protective canvas or linen a enveloping the rim C and are interposed between
the edges of the metallic rim C. and the strengthening folds b and c of canvas or
linen, bereinafter more particularly referred to, so as to protect the latter from being
injured by the edges of the metallic rim C.
A strengthening fold or layer b of cloth, linen or canvas, which is cemented or
otherwise affixed to the inner surface of the external covering A, envelopes the inner
tube B and the rim to which latter it is cemented or otherwise securely fastened
so as to retain the tyre thereon in a very efficient manner; a second strengthening
.fold or layer c of linen or canvas being attached to the inner surface of the before
mentioned layer b and cemented to the linen or canvas layer a encircling the metallic
rim C.
I provide, at any suitable position on the rim of the wheel, a specially constructed
non-return air-valve such as that described in the Specification filed with my Appli-
cation for Patent No. 4115 of the present year, the end of the said non-return valve
being inserted through an aperture formed for the purpose in the metallic rim C and
protruding within the tube B into which the air or gas is forced, through the said
non-return valve, by any suitable means such as a force pump, until the internal
tube B has been sufficiently inflated.
The enveloping folds or layers of canvas b, c, effectually resist any undue pressure
that may be exerted by the contained air or gas at any particular point and thus
prevent deformation of the tyre. The said folds or layers moreover serve to
Feffectually maintain the tyre in the desired position on the metallic rim C of the
cycle or other vehicle wheel.
From the foregoing description it will be obvious that a hollow air inflated India-
rubber tyre constructed in accordance with my present Invention as above described
possesses several important advantages over the solid india-rubber tyres at present in
use, inasmuch as, whilst being equal in strength to those ordinarily made, it is more
elastic, all vibration and shock when riding or driving over rough roads being
intercepted between the rim of the wheel and the ground, consequently little or no
jar is experienced by the rider or riders, or occupants of the cycle or vehicle to which
my improvement are applied.
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
1st. The combination with the inner tube designed to be inflated with air or gas,
of an India-rubber covering thickened at that portion which comes in contact with
the ground for the purpose above specified.
2nd. The improved method or manner of strengthening an inflated tubular tyre and
fastening or securing the same on the rim of the wheel substantially as hereinbefore
.alescribed.
1000
JAMES STEVENSON,
Gray's Inn Chambers, 20, High Holborn, London, W.C., Agent for Applicant.