Improved Means of Protecting Pneumatic Tyres of Cycle and other Vehicle Wheels.
Year: 1895

page_text: Date of Application, 9th Nov., 1895
Complete Specification Left, 10th Aug., 1896-Accepted, 10th Oct., 1896
PROVISIONAL SPECIFICATION.
Improved Means of Protecting Pneumatic Tyres of Cycle and other
Vehicle Wheels.
I, FRANCIS WENTWORTH BREWSTER, of The Golfers' Club, Whitehall Court,
London, Gentleman do hereby declare the nature of the said invention to be as
follows:-
This invention relates to improved means of protecting pneumatic tyres of
cycle and other vehicle wheels, the main object of the invention being to adapt
and apply a pneumatic tyre to a cycle or other vehicle wheel in such a manner as
to prevent puncture of the tread thereof by any obstacle on the road and as to
avoid flattening of the trend of the tyre when travelling over the road.
In carrying out the invention, I use a pneumatic tyre, conjunctively with a
protecting trend-rim made of steel or other suitable metal or other suitable
material and of a sectoral formation in cross section, the same being hollowed on
its inner circumference and adapted to fit the external periphery of the pneumatic
tyre when the latter is inflated, and to present on its outer circumference a convex
surface relatively to the road.
The pneumatic tyre will thus be located between the concave wheel-rim and the
concave tread-rim, and will be placed in position between such parts when in an
uninflated condition; the tread-rim will then be located relatively to the wheel-rim
by inflating the pneumatic tyre which will cause the tread-rim to be kept equidistant
from the wheel-rim. The tread-rim will, consequently, protect the tread of the
pneumatic tyre and prevent it from flattening on the roadway or from being
punctured when ridden.
The pneumatic tyre may consist of a single tube, or may be fitted with an
inflating tube, and may be applied to the wheel-rim and inflated in any couvenient
manner.
The opposite edges of the wheel-rim and of the tread-rim are preferably beaded,
to prevent the pneumatic tyre from being cut thereby should the pneumatic tyre
not be fully inflated.
Improved Means of Protecting Pneumatic Tyres of Cycle and other
Vehicle Wheels.
I, FRANCIS WENTWORTH BREWSTER, of The Golfers' Club, Whitehall Court,
London, Gentleman, 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 relates to pneumatically tyred cycle and other vehicle wheels ;-
the objects of the invention being to prevent puncture of the tread of the tyre by

page_text: any obstacle on the road and to avoid flattening of the tread when travelling over
the road, by the use of a tyre-shield of the nature hereinafter referred to.
The accompanying drawings represent cross sections of modifications of the
shield and of a pneumatically tyred wheel adapted therewith.
In carrying out the invention, I use, and apply externally of the pneumatic
tyre a, of the wheel, as the means of obtaining the objects of the invention, a
shield or protecting tread-rim b, made of steel or other suitable metal or of wood
or other suitable material sufficiently rigid to cause the tread-rim to retain its
normal form and prevent it from being flattened or altered laterally or longitudinally
by the inflation of the tyre or by the travelling of the wheel over the road, and of
a sectoral formation, preferably almost semi-cylindrical, in cross section, the same
being concaved or hollowed on its inner circumference and adapted to fit the
external periphery of the tyre a, when inflated, and to present, on its outer
circumference, a correspondingly convexed surface relatively to the road, vide Fig. 1.
Such road surface may, however, be somewhat flattened in cross section (vide Fig. 3),
it may also be either plain (Fig. 1) or may be longitudinally ribbed as at 6 1, or
corrugated or otherwise roughened to lessen the liability of side slip.
When applied to a single tube pneumatic tyre, vide Fig. 1, to which the invention
is particularly applicable, the tyre will be located immediately between the
outwardly hollowed concave wheel-rim c, and the inwardly hollowed concave
tread-rim b, and will be placed in position between such parts when in an uninflated
condition, or the tread-rim may be placed in position after the uninflated tyre has
been applied to the wheel, and the tread-rim will then be located relatively to the
wheel-rim, and all the parts relatively to each other, by inflating the tyre, which
will cause the tread-rim to be kept equidistant at all parts from the wheel-rim.
The tread-rim will, consequently, protect the tread of the tyre and prevent it
from flattening on the roadway or from being punctured by any obstruction
thereon which may be overridden.
The tread-rim may, however, he likewise applied to the ordinary puncturable
and yielding rubber cover applied to the wheel-rim and enclosing an inner
pneumatic tube, but a principal advantage lies in its dispensing with the use of
such covers and substituting a tread-rim of the nature aforesaid applied directly to
the tyre.
Sufficient play should be left between the opposite edges of the wheel-rim and
tread-rim to prevent the same from contact when the cycle is being ridden, and
the edges of the tread-rim are wired or beaded at 62, to prevent the same from
cutting the tyre should it become partly deflated and bulge laterally.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
The application to pneumatically tyred cycle and other vehicle wheels, of a
protecting shield or tread-rim made of steel or other suitable metal or material
and of a sectoral formation in cross section, and adapted to fit the external
periphery of the pneumatic tyre when the latter is inflated and to present on its
outer circumference a convex or flattened plain, ribbed or roughened surface
relatively to the road, and to prevent puncture or flattening of the pneumatic
tyre, substantially as herein before described.
Dated this 10th day of Anonst. 1806
DAY, DAVIES & HUNT,
Chartered Patent Agents,
321, High Holborn, London, W.C., Agents for the Applicant.