Improvements in Cycle Driving Mechanism.
Year: 1894

page_text: Date of Application, 6th Nov., 1894-Accepted, 22nd Dec., 1894
COMPLETE
DIECIFICATION.
Improvements in Cycle Driving Mechanism.
I, THOMAS BOURNE, of Heath House, Yardley Wood, Kings Heath,.
Birmingham, in the County of Warwick, 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 has reference to simple and efficient driving mechanism for cycles
which shall not be open to the objection that obtains with the chain and chain
wheel gearing ordinarily employed viz. the loss by friction of a considerable.
percentage of the power exerted by the rider as I will now proceed to explain by
reference to the annexed sheet of drawings, in which
Fig. 1 is a side elevation of the rear part of a bicycle provided with driving gear
according to my invention;
Fig. 2 is a plan thereof with the upper part of the frame removed; and
Fig. 3 is a plan to a larger scale of so much of the driving mechanism as is
situated at one side of the driving wheel.
1 is a pinion on the end of the driving wheel axle; it gears with an internally
toothed wheel 2 which runs on a spindle 3 fixed to a bracket 4 on the framework
of the cycle. The toothed wheel 2 is formed or provided with a plain ring 2º and
with a projecting flange 2 for purposes hereinafter explained. 5 is the pedal
secured at the outer end of a lever 6 which according to my invention is formed or
provided with lateral projecting portions 6", 6b, between which the ring 2 passes
as shown. 7 is a link jointed at one end by a pin 8 to the lever 6 and pivoted at
the other end to the spindle 3 between which and the link there is sufficient friction
to ensure slight turning of the lever 6 relatively to the link, when the former is
subjected to downward pressure. 9 is a spring fixed to the link 7 and serving to
bring the lever 6 out of its bent position on the removal of the pressure of the-
rider's foot.
The arrangement is such that when the lever 6 is depressed by the pressure of
the rider's foot upon the pedal 5, the projecting portions 6ª, 6b of the lever will
tightly grip the inner and outer walls respectively of the ring 2* and will rotate.
the said ring and consequently also (through the toothed wheel 2 and pinion 1) the
axle of the wheel, the amount of rotation depending upon the extent of the down-
ward movement of the pedal. 10 is a projection from the lever 6 carrying a small
flanged guide roller 11 running against the flange 2b and serving to prevent the
lever 6 from moving outwardly. To the projection 10 is secured a rod 12 to which
is attached one end of a flexible cord 13 that passes over a guide wheel 14 on the
upper end of the fork, and whose other end is fastened to a similar rod 12 at the
other side of the driving wheel, the arrangement being such that as one end of
the cord is descending the. other end will be ascending and taking the lever to
which it is attached into position for its next downward movement. As will be
obvious each side of the driving wheel is provided with mechanism such as above-
described and it will be seen that with driving mechanism according to my invention
chains and chain wheels are dispensed with; there are no dead centres, and the.
pressure exerted upon the pedals is always effective. Furthermore except when
pressure is applied to one of the pedals 5, the driving mechanism will be entirely
out of gear so that the machine can be run without any movement of the pedals ;.
while if both pedals 5 be simultaneously depressed a powerful braking action will
take place.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
:-
1. Driving mechanism for cycles comprising a pinion 1, toothed wheel 2, ring 2*,
pedal 5 lever 6 6º, 6, and link 7 arranged and operating substantially as described.
2. Driving mechanism for cycles substantially as shown in and described with
reference to the drawings annexed.
ليم
1
CAT
1001
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.