Improvements in or connected with Pneumatic Tyres for Velocipedes and other Road Vehicles.
Year: 1896

page_text: Date of Application, 14th May, 1895
Complete Specification Left, 15th Feb., 1897-Accepted, 1st May, 1897
PROVISIONAL SPECIFICATION.
Improvements in or connected with Pneumatic Tyres for Velocipedes
and other Road Vehicles.
We, ALFRED EBENEZER MAVOR of 32 Victoria Street, Westminster, in the
County of London, Engineer, and WILLIAM JONES of 12 High Street, North
Woolwich, in the County of Kent, India Rubber Manufacturer, do hereby
declare the nature of this invention to be as follows:-
Our invention refers to improvements in that class of pneumatic or inflated tyres
composed either of an outer cover enclosing an inner inflated chamber, or a single
tube inflated tyre.
According to our invention we provide between the main inflatable iuner tube
and the base of the felloe, a secondary inflatable tube or tubes and thereby increase
the resiliency of the tyre, while reducing the wear of the main inner tube, by
reason of the said main inner tube acting between the resilient secondary tube or
tubes and the outer cover, the main inner tube being thus also distanced from the
devices for holding or securing the outer cover to the rim, and thereby is still
further preserved.
We arrange below the main inner tube, say, two circumferential elastic secondary
tubes, either containing air and hermetically sealed, or capable of inflation by a
valve or valves, as is also the main inner tube, and whereby the secondary tubes
support the main inner tube, and the latter supports the cover. The secondary
tubes act also laterally and retain the fixing of the outer cover in position, whether
this fixing consists of projecting ribs, hooks, or circumferential wires, formed with
or fixed at the edges of the said outer cover, or whatever other known fixing is or
may be employed. Sometimes instead of the main inner tube and outer cover we
may employ a single tube inflatable tyre.
The secondary air tubes are or may be covered with fabric or wire gauze, and
a band or tape may extend circumferentially above the said tubes and below the
main air tube.
According to another arrangement of our invention we provide one secondary
tube instead of two, and pass a tape or band circumferentially over same, tending
to cause the secondary tube to form a kind of lining for the channel of the
felloe.
Between the secondary tube and the main inner tube, we sometimes place a
lining piece, composed of celluloid, xylonite, or even metal, or other equivalent
material, and having laterally extending edges which alone, or in conjunction with
the edges of the secondary tube, pass above the flanged, hooked, or wired, edges of
the outer cover and retain same in position.
As will be observed, in no case does the main inner tube have the double duty
of bearing the pressure between the weight carried and the road, and of aiding in
retaining the outer cover as is now done in tyres at present constructed.
Sometimes also we may make the outer cover hollow to receive air, whereby
should same become punctured, the inner tube may be further inflated to fill the
space left by the collapse of the hollow outer cover.
1000
BREWER & SON,
London and Leeds, Agents for the Applicants.

page_text: Improvements in or connected with Pneumatic Tyres for Velocipedes
and other Road Vehicles.
We, ALFRED EBENEZER MAVOR of 32 Victoria Street, Westminster in the
County of London, Engineer, and WILLIAM JONES of 12 High Street, North
Woolwich, in the County of Kent, India Rubber Manufacturer, 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:-
Our invention refers to improvements in that class of pneumatic or inflated tyres
composed either of an outer cover enclosing an inner inflated chamber, or a single
tube inflated tyre.
According to our invention we provide between the main inflatable inner tube,
or single tube tyre, and the base of the felloe, a secondary inflatable tube, or tubes,
and thereby increase the resiliency of the tyre while reducing the wear of the main
air tube by reason, (for example in the case of double tube tyres) of the said main
inner tube acting between the resilient secondary tube, or tubes, and the outer
cover, the main inner tube being also distanced from the devices for holding or
securing the outer cover to the rim and thereby being still further preserved, all
as hereafter described.
In order that our invention may be readily understood we will describe same
with reference to the accompanying drawings,
Fig. 1 is a transverse section shewing a double tube inflated or pneumatic tyre
and rim, having intervening air cushioning tubes; Fig. 2 shews the application of
such intervening cushioning air tubes, to a single tube tyre; Fig. 3 shews a similar
tyre supported from the rim by a single secondary air tube;
Fig. 4 shews a transverse section of a tyre and rim where the outer cover is held
in position by a lining piece, in conjunction with the secondary tube;
Fig. 5 is an example of a double tube tyre having a secondary or supporting air
tube which also extends onto the interior edges of the outer cover; and Fig. 6 shews
a similar tyre in which the tread of the outer cover is provided with an auxiliary
air chamber.
Referring to Fig. 1 of the drawings, we arrange below the main inner tube A,
say two circumferential elastic secondary tubes B B, either containing air and
hermetically sealed, or capable of inflation by any ordinary valve or valves, as is
also the main inner tube A, and whereby the secondary tubes B B resting on the
base of the rim C support the main inner tube A, and the latter supports the outer
cover D.
The secondary tubes B B act also laterally, and retain the fixing of the
outer cover D in position, whether this fixing consists of projecting ribs, hooks or
circumferential wires formed with or fixed at the edges of the said outer cover, or
whatever other knowu fixing is or may be employed, in some cases we use prepared
gutta percha instead of wire for fixing the tyre covers. Sometimes instead of the
main inner tube and outer cover we may employ a single tube inflatable tyre A as
shewn at Fig. 2.
The secondary air tubes B B are or may be covered with fabric or wire gauze,
and a band or tape may extend circumferentially above the said tubes B B and
below the main air tube.
According to another arrangement of our invention, as shewn at Fig. 3, we
provide one secondary tube B instead of two, and pass a tape or band E circum-
ferentially over same, tending to cause the secondary tube E to form a kind of
lining for the channel of the felloe C.

page_text: As shewn at Fig. 4 we sometimes provide within a plain or crescent section
rim C, a lining piece C¹ composed of celluloid, xylonite, vulcanite or even metal,
the laterally extending edges of which pass above the edges of the outer cover D
and retain same in position, the secondary tube B covering the lining piece C' and
tending to hold the same in place. When the lining piece is of vulcanite, the
same may be inserted into the rim when in a softened condition, and be properly
shaped; when set the lining piece C¹ is then somewhat resilient and will have a
tendency to spring back into its required position upon the edges of the outer
cover. At Fig. 5 the secondary tube B is shewn extending above the edges of
the outer cover D and acting to retain the said edges in proper position.
As will be observed in no case does the main inner tube A have the double
duty, of bearing the pressure between the weight carried and the road, and of
aiding in retaining the outer cover D as is now done in tyres at present
constructed.
Sometimes as shewn at Fig. 6 we may make the outer cover D hollow as at D'
to receive air. Should the air chamber D¹ become punctured, the inner tube A
may be further inflated to fill the space left by the collapse of the said hollow
outer cover.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed we declare that what we
claim is :-
1. In tyres for velocipedes and other road vehicles, the application of an air tube,
or of air tubes, between the base of the rim and the inner inflated chamber or
tube, of a pneumatic tyre, or between the base of the rim and a single tube inflated
tyre, constructed and arranged substantially as described and illustrated with
reference to the accompanying drawings.
2. In tyres for velocipedes and other road vehicles, the combination of a rim C,
a separate lining piece of celluloid, vulcanite, metal or other material, to retain
the outer cover D, a secondary tube or tubes B, and an inflated tube or
chamber A, substantially as and for the purposes described and illustrated with
reference to Fig. 4 of the accompanying drawings.
3. The general construction and combination of parts composing our improve-
ments in tyres for velocipedes and other road vehicles, all arranged substantially
as and for the purposes described and illustrated with reference to the
accompanying drawings.
Deted this 15th day of February 1897
BREWER & SON,
London and Leeds, Agents for the Applicants.