Year: 1897

page_text: I, DAVID MARCUS, of 149, Fenchurch Street, in the City of London, Merchant,
do hereby declare the nature of my invention to be as follows:-
My Invention relates to velocipedes of the kind wherein are used twin wheels,
or wheels placed side by side in such proximity that the inner series of spokes of
the respective wheels cross each other after the manner described in the Specifica-
tion of my application for Letters Patent No. 21708 dated the first day of
October 1896, and my present Invention consists in combining with the said
twin wheels a chain wheel over which the driving chain is passed so that central
driving of the said twin wheels is effected. The said chain wheel is
arranged so that the sprocket teeth around its periphery are situated between
the inner series of spokes of the two wheels outward of the parts where they
cross each other. I do not limit myself to precise means by which the said chain
wheel is secured to the axle, or the spokes, or both, but the following is a con- .
venient arrangement. The chain wheel is secured to the axle between the two
flanges or collars to which the inner ends of the inner series of spokes of the
two wheels are respectively secured and in the said chain wheel are holes arranged
in a circle just inward of the periphery of the wheel the said holes being in
number equal to the total number of spokes in the two inner series of spokes.
The inner ends of the one inner series of spokes, connected to the flange or collar
at one side of the chain wheel, are led through alternate holes throughout the circle
and are at their outer ends connected to the rim of the wheel which is on the
side of the chain wheel opposite to that at which the flange or collar to which
their inner ends are connected is situated. The inner ends of the other inner
series of spokes connected to the other flange or collar are similarly led through
the other alternate holes and are connected to the other rim on the reverse side
of the chain wheel, the said spokes crossing each other in the manner requisite
to give proper rigidity to the wheel.
°
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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 ia
[Price 8d.1

page_text: to be performed, to be particularly described and ascertained in and by the
following statement:-
.
My Invention relates to velocipedes of the kind wherein are used twin wheels,
or wheels placed-side by side, in such proximity that the inner series of spokes of
the respective wheels cross each other after the manner described in the Specifica-
tion of my application for Letters Patent No. 21708 dated the 1st day of
October 1896 and my present invention consists in combining with the said
twin wheels, a chain wheel or ring over which the driving chain is passed so that
central driving of the said twin wheels is effected. The said chain wheel or ring is
arranged so that the sprocket teeth around its periphery are situated between
the inner series of spokes of the two wheels outward of the parts where they
cross each other.
In Figures 1 and 2 of the accompanying drawings I have shewn in side
elevation and plan respectively a'velocipede arranged or constructed in accordance
with my invention. Figure 3 is a cross section drawn to a larger scale through
the twin wheel. Figure 4 is a side elevation of the sprocket wheel shewing also
one of the collars. The rims A B are connected to collars on the shaft as described
in my aforesaid Specification of my application for Letters Patent No. 21708 of
1896. I do not limit myself to precise means by which the chain wheel E is
secured to the axle or the spokes, or both, but the arrangement illustrated is
that I prefer. The chain wheel E is secured to the axle between the two flanges
or collars to which the inner ends of the inner series of spokes of the two
wheels are respectively secured and in the said chain wheel are holes e arranged
in a circle just inward of the periphery of the wheel the said holes being in
number equal to the total number of spokes in the two inner series of spokes.
The inner ends of the one inner series of spokes, connected to the flange or
collar () at one side of the chain wheel E are led through alternate holes e
throughout the circle and are at their other ends connected to the rim of the
wheel A which is on the side of the chain wheel E opposite to that at which
the flange or collar to which their inner ends are connected is situated.
inner ends of the other inner series of spokes connected to the other flange or
collar, are similarly led through the other alternate holes e and are connected
to the rim of the wheel B on the reverse side of the chain wheel E the said
spokes crossing each other in the manner requisite to give proper rigidity to
the wheel.
The
The frame F is shaped as shewn to allow of the central placing and working
of the sprocket wheel G driven by the pedals and of the driving chain H.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I 'claim is:
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1. A twin wheel for velocipedes formed by the connection of two rims to collars
on the hub by means of spokes arranged as described, in combination with a
sprocket, or like wheel or ring, situated between the inner sets of spokes and
outward of the, place where they cross;, substantially as herein before described.
2. A twin wheel for velocipedes formed by the connection of two rims to collars
on the hub by means of spokes arranged as described in combination with a
sprocket, or like, wheel secured to the hub, and provided with holes, or slots,
through which the inner sets of spokes are passed; substantially as herein-
before described.
4
3. A velocipede having a twin-wheel formed by the connection of two rims to 5
collars on the hub by means of spokes arranged as described, in combination
with a sprocket, or like, wheel situated between the inner sets of spokes and
outward of the place where they cross, and another sprocket, or like, wheel driven
by the treadles, and a frame shaped so as to allow of this last named sprocket, or
like, wheel, and the cliain, or transmission, gear, 'being situated, and working, in
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page_text: line with the first named sprocket, or like, wheel; substantially as hereinbefore
described.
Dated this 19th day of November 1897.
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.