An Improvement in Wheels for Bicycles and other Vehicles.
Year: 1896

page_text: Date of Application, 1st Oct., 1896
PROVISIONAL SPECIFICATION.
An Improvement in Wheels for Bicycles and other Vehicles.
DAVID MARCUS 149 Fenchurch Street London Merchant do hereby declare the
nature of this invention to be as follows:-
I take two round steel rims such as are used for constructing light wheels, in the
centre thereof I place a hub having at least four collars from which will be sent
spokes to carry the weight on the wheel from the rims on the hub the inner set of
spokes will be interlocked and crossed transversely to the hub thereby producing a
single axis at the same time a twin interlocked wheel which will be stable and self
balancing.
Dated this 30th den of Santambon 2000
I DAVID MARCUS of 149 Fenchurch Street in the City of London, Merchant 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 :-
Having taken two round Rims of Steel or other usual material, such as is generally
used for constructing light Wheels, I place a Hub in the centre, having at least four
collars, and connect the Hub to the independent Rims by Spokes from the Collars
arranged in such a manner that the inner sets of spokes will be interlocked and
crossed transversely to the Hub, thereby producing a single axis, the independent
Rims may be fixed any convenient distance apart, by this arrangement the Hub
Rims will be rigid with each other as if the Hub carried one rim only and at the
same time a twin interlocked wheel will be obtained having two independent Rims.
I claim that this Wheel is effective for the prevention of vibration, the promotion
of ease, steadiness and safety in running, the prevention of side slip, and possesses
perfect stability. The twin wheel so arranged is more stable, and balances better
than a single wheel when running straight, and in turning curves compensation is
gained to meet the variation of radii by fitting the rims with pneumatic, compressible
or spring tyres, the arrangement of the rims and spokes on the hub allowing the
tyres to be compressed or expanded as the case may be in accordance with the weight
placed upon the wheel.
The accompanying Drawing represents in side view in Figure 1 and vertical section
in Figure 2 a twin wheel made in accordance with my invention. A B are the two
separate rims and C is the hub provided with four collars c¹ c² c³ and c'. The sets of
spokes d¹ d² d³ d' connect the rims to the hub by being secured to the rims and to

page_text: the collars on the hub. The spokes d¹ are connected to the rim A and collar c¹, the
spokes d² to the rim A and collar c', the spokes d³ to the rim B and collar c', and
the spokes d' to the rim B and collar c2, the spokes d2 and d' therefore crossing
and interlocking or bearing on each other at d. The sets of spokes d¹ d² extend at
angles with the axis equal to each other and the sets of spokes d³ d' also extend
at angles with the axis equal to each other as it is important that the sets of
spokes on each side of each component wheel should be at the same angle with the
axis to secure the requisite stability of the twin wheel and prevent its collapse
in use.
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 twin wheel suitable for bicycles and other vehicles formed by the connection
of two independent rims to the collars of the hub by means of spokes arranged in such
a manner that the inner and outer sets of spokes extend from the respective rims
and join the hub at equal angles and that the inner sets of spokes are interlocked with
or cross each other transversely to the hub substantially as hereinbefore described and
illustrated by the accompanying Drawing.
Dated this 15th day of April 1897.
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.