Year: 1897

page_text: Date of Application, 27th Feb., 1897
Complete Specification Left, 29th Nov., 1897-Accepted, 5th Feb., 1898,
I, PHILIP LOUIS RENOUF, of 19 and 20, Holborn Viaduct, in the City of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention is applicable to pneumatic tyres in which a separate and tubular air
chamber is protected from contact with the road by a separate cover and is
prevented from expansion (when under pressure) by a jacket attached to this cover,
or to pneumatic tyres in which the inexpansible, or comparatively inexpansible
jacket is air-proofed on it's inner side and rendered aircontaining by means of a
longitudinal seal.
The jacket is protected from wear on those parts which are liable to come in contact
with the ground by rubber or other suitable material; its edges overlap one edge
being girder shaped, and the other edge being formed to fit one side of the girder,
but being concave on the side opposed to the girder.
The side of the girdered edge not in contact with the other edge is the one to be
mounted on the rim of the wheel.
Sometimes the rim side of the girder edge is shaped to embrace the rim. Some-
times the rim side of the girder edge is flat or nearly so and is solutioned, rivetted
or otherwise fixed to the rim; in this case one or more lengths are left not fixed;
when the tyre is inflated the tension of the overlapping edges will prevent them from
coming off the rim, but when the tyre is deflated or soft, the part of the girder
edge which is not fixed can be pulled over the side of the tyre, when the two
edges are easily separable. Where no separate and detachable tubular air-chamber
is used the jacket is air-proofed on its inner side side; the over-lapping edges are
provided with sufficient rubber or viscous matter to form an airtight seal; the sealing
action may be assisted by an elastic or partially elastic and springy wire inserted in
or overlaying the inner edge. As the inflation of the tyre does not exert a laterally
expansive strain on the rim, the latter is preferably of wood and flat topped.
Dated this 26th day of February 1897.
Improvements in and connected with Pneumatic Tyres.
I, PHILIP LOUIS RENOUF, of 19 and 20, Holborn Viaduct, in the City of London,
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 :-
My invention is applicable to pneumatic tyres in which a separate and tubular air
chamber is protected from contact with the road by a separate cover and is prevented

page_text: from expansion (when under pressure) by a jacket attached to this cover, or to
pneumatic tyres in which the inexpansible, or comparatively inexpansible jacket is
air-proofed on its inner side and rendered aircontaining by means of a longitudinal
Beal.
The jacket is protected from wear on those parts which are liable to come in
contact with the ground by rubber or other suitable material; its edges overlap, one
edge being girder shaped, and the other edge being formed to fit one side of the
girder, but being concave on the side opposed to the girder.
The side of the girdered edge not in contact with the other edge is the one to be
mounted on the rim of the wheel.
:
Sometimes the rim side of the girder edge is shaped to embrace the rim. Some-
times the rim side of the girder edge is flat or nearly so and is solutioned, rivetted
or otherwise fixed to the rim In this case one or more lengths are left not fixed;
when the tyre is inflated the tension of the overlapping edges will prevent them
from coming off the rim, but when the tyre is deflated or soft, the part of the girder
edge which is not fixed can be pulled over the side of the tyre, when the two edges
are easily separable. Where no separate and detachable tubular air-chamber is used
the jacket is air-proofed on its inner side side; the overlapping edges are provided
with sufficient rubber or viscous matter to form an airtight seal: the sealing action
may be assisted by an elastic or partially elastic and springy wire inserted in or
overlaying the inner edge. As the inflation of the tyre does not exert a laterally
expansive strain on the rim, the latter is preferably of wood and flat topped.
Referring to the drawings Fig. 1. shews in section a deflated air-chamber A with
valve attachment V an outer cover C and a flat-topped rim B. The outer cover C is
built up in the usual way out of a band or of layers of flexible fabric and covered
with a rubber tread to protect the same from contact with the ground; it is provided
on one edge with a foot or bead E and along the other edge with a wide girder
shaped base D; this girder or H-shaped foot D is made so as to fit over the
top of rim B as shewn in Fig. 2 representing a section of the whole tyre in
position.
It is evident that though the tyre will not readily come off the rim by_mere
deflation, yet when a laterally pulling or pushing action is applied to the base D in a
line across the top of rim B, the tyre being at the same time quite deflated and
flabby, this base can be pulled out of its position on the rim until the foot or bead E
is released.
Fig. 3 shews a tyre in which the separate airchamber is dispensed with by air
proofing the inner walls of the tyre; the air is retained through the fit of the foot
or bead E into the recess of foot or base D; these air-sealing qualities may be
assisted by a longitudinal spring F.
Where base D is attached to the rim by cementing or by mechanical means to the
top of rim B at intervals, it is evident that no part need overlap the edges of
the rim.
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 detachable pneumatic tyre with an accessible interior in which an outer
cover C is provided with a girder shape base D forming an integral part of such cover
and also a receptacle for an edge E in the manner described.
•
2. The combination of a pneumatic airchamber A Figures 1 and 2 with a detach-
able outer cover C, having a base D forming an integral part of the same, capable of
retaining a foot or edge E and simultaneously held on the rim B in the manner
described.
3. The combination of a grooveless rim or a rim in which no grooves are required
for the purpose of retaining the tyre, with a single tube pneumatic tyre with an
accessible interior and held on the rim by a girder shaped or double footed base as
illustrated in Fig. 3.

page_text: 4. The combination of a single tube tyre with accessible interior on a grooveless
rim substantially as described with a spring mechanism F Fig. 3 for the purpose of
assisting the longitudinal airtight seal.
Dated this 27th day of November 1807