Improvements in Pneumatic Tyres for Cycles and other Vehicles.
Year: 1899

page_text: COMPLETE SPECIFICATION.
Improvements in Pneumatic Tyres for Cycles and other Vehicles.
I, JOHN ANDREW GARVIN, residing on the property of the Geldenhuis Deep
Level Gold Mining Company, Limited, Elandsfontein, South African Republic,
Millwright, 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 a pneumatic tyre principally intended for bicycles,
tricycles and other similar vehicles of light construction, although it may be
utilized in the construction of the same kind of tyre for many classes of road
vehicles.
It has for its object to provide the tyre with an auxiliary inner chamber or
tube which may be inflated without having to detach the tyre from the rim
of the wheel in the event of the ordinary pneumatic tube collapsing through
puncture or otherwise. By this means I avoid the objectionable delays occasioned
on the puncturing of a tyre by obviating the necessity for the removal of the
tyre from the rim of the wheel in order to locate and obtain access to the puncture
to effect its repair, which repairing operation is also in itself a tiresome and very
frequently long performance.
The essential feature of my invention lies in the form or construction of the
inner or pneumatic tube, which may be stated to consist of an ordinary tube
formed double or comprising two separate layers or sections for the greater part
of its circumference, or provided with a partial lining, so that that part or a
portion of that part of the tube contained or resting within the rim of the wheel
shall be common to the two sections or layers, thus forming two totally distinct
compartments or chambers within the tube either of which may be inflated inde-
pendently of the other.
In order that the invention may be the more clearly and readily understood
I append hereto a drawing thereof, in which it is illustrated in its application
to a common form of cycle wheel and tyre.
In the drawing
Fig. 1 is a transverse section of the rim of the wheel with the tyre in position
thereon, shewing the outer compartment or chamber fully inflated.
Fig. 2 a similar view shewing the inner and auxiliary chamber or compartment
fully inflated.
Fig. 3 a like view intended to represent both chambers partially inflated.
Fig. 4 a side elevation, partly in section, of a portion of the wheel rim and
yre shewing the means for inflating the outer compartment.
a indicates the rim and 6 the spokes of the wheel; c the edges of the viv
מ

page_text: forming ledges or projections around the rim on the inside; d is the outer cover
or tread provided with the retaining wires or hoops e in its edges, which lie
beneath the ledges or projections e of the rim when in position. These several
parts may be of any ordinary and suitable construction as they do not embody
any feature of this invention.
f is the inner or pneumatic tube, which, as shown is formed double or of two
separate layers or sections g h for the greater portion of its circumference, or
from the point i to a corresponding point j on the opposite side, thus dividing
the tube into two totally distinct, chambers or compartments & -sce Fig. 3. The
part m of the tube which rests within the rim is formed of a single section or
thickness, and is common to the two layers g h or the double portion of the tube.
In Fig. 1, wherein the outer chamber k is shewn fully inflated, the inner
section or partial lining his collapsed and compressed within the rim a, which
is the position it assumes owing to the pressure of the air within the outer
chamber. When the inner chamber is inflated, as shewn in Fig. 2, it also dis-
tends the outer section g of the tube which acts as an additional safeguard against
puncture for the inner section h. Fig. 3 does not illustrate the tyre in a fixed
position as in Figs. 1 and 2, but is added to render the construction of the pneumatic
tube more intelligible.
n-see Fig. 2 is the casing of the valve, projecting through the rim a and
fitted to the inner portion or part m of the tube f, for inflating the inner chamber 7.
The valve may be of any ordinary form and be attached to the tube in the usual
or other suitable manner.
For the purpose of inflating the outer chamber & the small tube o-see Fig. 4-
is employed arranged so as to open to the outside of the tube f at the one end
and to open into the chamber k at the other. This tube o is attached to the part m
and to the inner section h of the pneumatic tube f and forms an airtight joint
therewith. It is set at an inclination and made somewhat heavier or thicker
than the parts of the pneumatic tube so as to prevent it being doubled back
upon itself during the operation of inflating the chamber and so that it will
fold round the inside of the rim on the collapse of the inner section h.
p is the casing of the valve for inflating the outer chamber fitted in the
open end of the small tube o. This valve may also be of any ordinary and
suitable construction. Its inner extremity is shaped to fit the tube o and turned
up at a corresponding inclination. The valve is secured to the part m of the
tube by means of screws screwed through a flange g formed on the valve casing p
into a ring or washer encircling the base of the tube o on the inside. It will
be evident that other alternative constructions may be adopted for securing the
valve to the base m of the pneumatic tube f.
This construction of pneumatic tube is equally applicable to single tube tyres,
that is to say, to those in which the outer covering is dispensed with.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is;-
1. A tyre for cycles and other vehicles in which the pneumatic tube is formed
double or comprises two separate layers or sections for the greater part of its
circumference thus dividing the tube into two separate compartments capable of.
being inflated independently of one another substantially as and for the purposes
described.
2. A tyre for cycles and other vehicles having the pneumatic tube provided
with a partial lining dividing it into two separate chambers and fitted with a
small inclined tube opening to the outside of the pneumatic tube at one end and
passing through the inner compartment and opening into the outer compart-
ment at the other end for inflating the outer compartment independently of the
inner compartment, substantially as described.

page_text: 3. A tyre for cycles and other vehicles having its several parts constructed
and arranged in combination, substantially as described and shewn in the accom-
panying drawings.
Total
00 1 1
BOULT & WADE,
Agents for the Applicant.