Year: 1896

page_text: I, SIDDI SCHWARZENBERGER, of 38 Im Trutz, Frankfort-on-the-Main, in the-
German Empire, Director of Public Company, do hereby declare the nature of
this invention to be as follows:-
This invention relates to improvements in cycles, and is designed to provide a
simple and efficient form of driving gear, whereby the use of the ordinary driving
chain is entirely obviated.
For this purpose, I substitute for the pinion and sprocket wheels, such as used.
in chain driving gear, wheels having inclined or helical teeth, each wheel having
its teeth in gear with a worm formed with very rapid threads. The two worms.
are mounted on a shaft which extends from one wheel to the other, and has its
extremities carried in brackets secured to the parts of the frame in which the
wheels are mounted.
The shaft serves to transmit the movement direct from the toothed wheel,..
which replaces the ordinary sprocket wheel on the pedal axle, to that which
replaces the pinion on the driving wheel, and the ratio of speed or degree of
gearing depends on the relative sizes of the two wheels, as in ordinary chain
driving.
י
1000
1, SIDDI SCHWARZENBERGER, of 38 Im Trutz, Frankfort-on-the-Main, in the
German Empire, Director of Public Company, 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, reference being had
to the accompanying drawings and to the letters and figures marked thereon, that
is to say:
This invention relates to improvements in cycles, and is designed to provide a
simple and efficient form of driving gear, whereby the use of the ordinary driving
chain is entirely obviated.
For this purpose, I substitute for the pinion and sprocket wheels, such as used
in chain driving gear, wheels having inclined or helical teeth, and each wheel
having its teeth in gear with a worm formed with very rapid threads. The two
worms are mounted on a shaft which extends from one wheel to the other, and
has its extremities carried in brackets secured to the parts of the frame in which
the wheels are mounted.

page_text: The shaft serves to transmit the movement direct from the toothed wheel which
replaces the ordinary sprocket wheel on the pedal axle, to that which replaces the
pinion on the driving wheel, and the ratio of speed or degree of gearing depends
on the relative sizes of the two wheels, as in ordinary chain driving.
And in order that my invention may be readily unlerstood I will describe the
same fully with reference to the accompanying drawings, in which:
Fig. 1 is a side elevation of a safety bicycle having my improvements applied
thereto, and
Fig. 2 shews part of the same bicycle with my improvements, drawn to a larger
scale.
In carrying my invention into effect, I-mount-on the crank axle a
wheel a, having helical teeth, adapted to gear with a worm b formed with rapid
threads. The worin bis mounted on a shaft c-carried at the side of, and parallel
with, the driving wheel of the machine, in hanging brackets d and e fitted
respectively to the crank axle and to the axle of such driving wheel. The shaft c
is of a length to suit the distance between the hanging brackets d, e, and is
provided with a second worm f, similar to the worm b, adapted to gear with a
small worm wheel g fixed on the axle, or on the bub, of the driving wheel of the
machine.
It is obvious that the power exerted by the rider on the treadle mechanism
will thus be transmitted to the driving wheel of the machine in a more regular and
noiseless manner than by the ordinary chain and sprocket wheel arrangement.
Instead of worms and worm wheels, I may use bevilled wheels.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, 1 declare that what I
claim is :
1. In cycles, driving gear consisting of two worms mounted on a shaft carried
in brackets at the side of the driving wheel, and extending from the latter to the
cranks, so as to bring the said worms into gear with worm-wheels mounted
respectively on the crank axle and on the axle of the driving wheel of the cycle,
substantially as described.
2. My improvements in cycles, substantially as hereinbefore described and shewn
with reference to the accompanying drawings.
Dated this 21st der of December 1896
ERNEST DE PASS,
Chartered Patent Agent,
78, Fleet Street, London, and 5 Market Street, Nottingham,
Agent for the Applicant.