Improvements in and relating to Elastic or Pneu natic Tyres for the Wheels of Velocipedes and other Vehicles.
Year: 1896

page_text: Date of Application, 11th June, 1895
Complete Specification Left, 10th Mar., 1897-Accepted, 10th Apr., 1897
Improvements in and relating to Elastic or Pneu natic Tyres for the
Wheels of Velocipedes and other Vehicles.
I, JEAN MARIE BOYER of 38 bis Rue Fontaine, Paris, France, Manufacturer,
do hereby declare the nature of this invention to be as follows:-
This invention has reference to elastic or pneumatic tyres for the wheels of
velocipedes and other vehicles.
The invention is characterized by the combination of two pneumatic tubes and
a central solid or hollow india rubber tyre placed between the two pneumatic tubes
and constituting the tread the whole being retained by simple juxtaposition and by
the pressure exerted by the two pneumatic tubes at the bottom of lateral recesses
in the central tyre.
The central tyre or tread transmits the pressure it receives when travelling to
the pneumatic tubes; there is therefore great resiliency and great steadiness of
movement. If the wheel becomes inclined the pressure increases in the tube
which is at the side to which the wheel inclines but I connect the two tubes by
means of a single valve and nozzles by which they are charged simultaneously;
consequently the second tube which receives excess of air becomes a little further
inflated. Accidental inclinations are thus automatically corrected.
In carrying out my invention I employ a metal or other rim with two lateral
trough like recesses to receive the two pneumatic tubes which are covered with
canvas or other material to prevent them from being inflated beyond a given
limit. The central tyre is preferably of rounded form at the periphery; it is
hollowed at each side to form two recesses to receive the pneumatic tubes so that
when these tubes are inflated the parts are held together without cementing wiring
or other means. The rim has a central recess which not only serves to receive the
outer ends of the spokes but also to allow the inner part of the central tyre to rise
under the pressure.
When the central tyre is hollow it is preferably made in one piece folded to
form a central aperture or hollow core, the parts near the two edges being made to
meet in the space between the pneumatic tubes one edge having a groove and the
other a rib to enter this groove and thereby form a joint.
The central tyre may be formed externally with lateral ribs or flanges to bear
against the pneumatic tubes.
When the central tyre is hollow it is desirable to make small channels at
intervals in the solid part to allow air to pass to and inflate the non-compressed
parts when the parts which come in contact with the ground become more or less
flattened the flow of air being in the interior of the rim.
In case either or both the pneumatic tubes get punctured the velocipede can
still be ridden as the inner part of the central tyre then bears upon the face of
the rim.
I will now describe the arrangement of the valve and two nczzles which I fit to
the two pneumatic tubes so as to charge them simultaneously and also to effect
permanent communication between them. A charging tube fitted as usual with a
non return valve terminates in a chamber to which are connected two nozzles for
the two pneumatic tubes respectively. Each of these nozzles is first fitted into its

page_text: pneumatic tube and is held in place by a shoulder on one side and a nut on the
other. The nuts are screw threaded in reverse directions the nozzles being
correspondingly threaded. The two nozzles are connected to the chamber above
described by female screws on the chamber engaging with screw threads on the
nozzles. Washers of soft metal such as lead should be interposed between the
outer cheeks of the chamber and the shoulders on the nozzles so as to make a tight
joint.
Dated this 11th day of June 1800
J. C. MEW BURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.
Improvements in and relating to Elastic or Pneumatic Tyres for the
Wheels of Velocipedes and other Vehicles.
1, JEAN MARIE BOYER of 38 Rue Fontaine, Paris, France, 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 :-
This invention bas reference to elastic or pneumatic tyres for the wheels of
velocipedes and other vehicles.
The invention is characterized by the combination of two pneumatic tubes and
a central solid or hollow india rubber tyre placed between the two pneumatic
tubes and constituting the tread, the whole being retained by simple juxtaposition
and by the pressure exerted by the two pueumatic tubes at the bottom of lateral
recesses in the central tyre.
The central tyre or tread transmits the pressure it receives when travelling to
the pneumatic tubes; there is therefore great resiliency and great steadiness and
smoothness of movement. If the wheel becomes, inclined the pressure increases
in the tube which is at the side to which the wheel inclines but I connect the two
tubes by means of a single valve and nozzles by which they are charged
simultaneously; consequently the second tube which receives excess of air
becomes a little further inflated. Accidental inclinations are thus automatically
corrected.
I will now proceed to more fully describe my invention with reference to the
accompanying illustrative drawings in which,-
Figures 1 and 2 are respectively a side elevation and an end elevation of a wheel
fitted with a multiple tyre according to the present invention.
Figure 3 is a cross section on a natural scale of the said multiple tyre.
Figure 4 is a similar cross section showing my improved valve for simultaneously
charging the two pneumatic tubes.
Figure 5 is a cross section similar to Figure 3, but showing the tyre when
compressed by impact with an obstacle or prominence on the ground.
Figures 6 and 7 are cross sections similar to Figures 3 and 4 in which the central
tyre is hollow and is formed by folding.
Figure 8 is a cross section similar to Figure 6, showing a modified form of hollow
folded central tyre.
Figures 9, 10 and 11 are respectively a view partly in central vertical longitudinal
section, an end elevation, and a view partly in cross section of the improved valve
by means of which the two side pneumatic tubes are charged simultaneously.
Figure 12 is a central vertical section of a modified construction of the valve.

page_text: - Figures 13 and 14 are cross sections illustrating two forms of rim for the wheels.
of light and heavy road vehicles respectively.
In carrying out my invention as illustrated by Figures 1 to 5, I employ a metal"
or other rim. A with two lateral trough like recesses to receive the two pneumatic
tubes B B which are covered with canvas or other material C to prevent them from.
being inflated beyond a given limit. The central tyre D is preferably of rounded
form at the periphery; it is hollowed at each side to form two recesses to receive
the pneumatic tubes B B so that when these tubes are inflated the parts are held
together without cementing, wiring or other means. The rim A has a central
recess a which not only serves to receive the outer ends of the spokes but also to.
allow the inner part of the central tyre to rise under the pressure."
When the central tyre is hollow as shown at E in Figures 6 to 8 it is preferably
made in one piece folded (Figures 6 and 8) to form a central aperture or hollow core,.
the parts, a near the two edges being made to meet in the space between the
pneumatic tubes one edge having a groove b, and the other a rib e to enter the-
groove band thereby form a joint. The hollow central tyre E may however be
moulded in one piece.
The central tyre may be formed externally with lateral ribs or flanges dd to
hear against the pneumatic tubes B B as shown in Figure 8.
When the central tyre is hollow (Figures 6 to 8) it is desirable to make small
channels e (Figure 8) at intervals in the solid part to allow air to pass to and inflate
the non-compressed parts when the parts which come in contact with the ground.
become more or less flattened, the flow of air being in the interior of the rim.
Four such channels are indicated by the reference letters ffffin Figure 1.
In case either or both the pneumatic tubes get punctured the velocipede can still
be ridden as the inner part of the central tyre then bears upon the face of
the rim.
I will now describe with reference to Figures 4, 7, 9, 10, 11, the arrangement of
the valve and two nozzles which I fit to the two pneumatic tubes B B so as to
ebarge them simultaneously and also to effect permanent communication between.
them. A charging tube F fitted as usual with a non return valve terminates in a
chamber G to which are connected two nozzles gg for the two pneumatic tubes B B.
respectively. Each of these nozzles g g is first fitted into its pneumatic tube B and
is held in place by a shoulder h on one side and a nut i on the other. The nuts ii
are screw threaded in reverse directions the nozzles 99 being correspondingly
threaded. The two nozzles g g are connected to the chamber G by female screws.
on the chamber engaging with screw threads k k on the nozzles gg. Washers of
soft metal such as lead, should be interposed between the outer cheeks of the
chamber G and the shoulders h, h on the nozzles gg so as to make a tight joint.
m (Figures 4 and 7) is a recess formed in the upper part of the central tyre to
receive the base of the valve.
In the modified arrangement of valve shown in Figure 12, the tube F may be-
closed either by means of a plug o as shown, or by a valve during the inflating-
operation.
A three way cock p controls the flow of compressed air through the two.
transverse tubes tt which communicate respectively with the two pneumatic-
tubes B B. The walls of the latter are gripped between the shoulders rr of the
nozzles ss and the nuts gg. The rim A of the wheel is held between the nuts v v
and nuts qq.
When the pneumatic tubes B B have been properly inflated, the-
cock is turned half-way round into the position shown, whereby all communication.
with the external air is cut off, whilst still affording communication between the
two pneumatic tubes B B. The valve which prevented the escape of air during
inflation may now be removed and the plug o inserted.
P
Figures 13 and 14 show two arrangements for wheels for road vehicles other
than velocipedes, such as for motor cars and the like. Figure 13 shows a form of
wheel rim suitable for light wheels fitted with metal spokes, and Figure 14 a form.
of wheel rim suitable for heavier wheels fitted with wooden spukes.

page_text: 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. The improved multiple tyre for the wheels of vehicles consisting of the
combination of two pneumatic tubes with a central solid or hollow rubber tyre
constituting the tread and placed between the two pneumatic tubes, and a recessed
wheel rim substantially as described and shown.
2. The valve with two nozzles for simultaneously inflating the two pneumatic
tubes referred to in the preceding claim and also for normally establishing
communication between the said two pneumatic tubes, substantially as described
and shown.
3. The combination in a wheel of the improved multiple tyre as specified in
Claim 1 and the improved valve as specified in Claim 2, substantially as described
and shown.
D101 1
J. C. MEWBURN & ELLIS,
55 and 56 Chancery Lane, London, Chartered Patent Agents.