Improvements in Driving Mechanism for Oyoles.
Year: 1895

page_text: Date of Application, 27th Apr., 1895
Complete Specification Left, 27th Jan., 1896-Accepted, 28th Mar., 1896
Improvements in Driving Mechanism for Oyoles.
We, CARL Voss and GEORG SAUER, both of Feldstrasse 115, Mühlhausen,
Thuringia, Germany, Machinists, do hereby declare the nature of this invention to
be as follows:-
According to this invention the pedal crank shaft is provided with a roller-
wheel, which through a toothed wheel drives a shaft intermediate of the said crank
shaft and the driving wheel axle, and the intermediate shaft through another
toothed wheel rotates another roller-wheel that is situated on the axle of the
driving-wheel of the cycle. Each of the roller-wheels carries near its periphery
radially arranged conical, cylindrical or spherical rollers, in the spaces between
which pass the teeth of the wheels on the intermediate shaft. By this means the
driving is considerably lighter than with chain-driving, sliding-friction being
replaced by rolling friction. The intermediate shaft can if desired be mounted in
ball-bearings.
The connection between the two toothed-wheels on the intermediate shaft
instead of being rigid may be effected by means of a coiled spring, whereby the
driving is rendered elastic and, in consequence of the stored-up spring-energy, the
dead-points of the crank usually arising during cycling are obviated, because
the energy stored up in the spring will carry the pedal-cranks over the dead-
centres.
Dated this 27th day of April 1895.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.
Improvements in Driving Mechanism for Cycles.
We, CARL Voss and GEORG SAUER, both of Feldstrasse 115, Mühlhausen,
Thuringia, Germany, Machinists, 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 has reference to improvements in driving-mechanism for cycles,
as we shall now describe with reference to the annexed drawings wherein
Fig. 1 is an elevation of the rear part of a cycle with one arrangement of our
improved driving mechanism applied to it; and
Fig. 2 is a plan of same, parts being broken away for the sake of showing the
remaining parts more clearly.
Figs. 3 and 4 are enlarged detail views hereinafter more specifically referred to.
Fig. 5 is a detail view showing a slight modification.
Figs. 6 and 7 represent respectively in side elevation and in plan (partly in
section) a modification of the arrangement shown in Figs. 1 to 5.
From Figs. 1 to 5 it will be seen that, according to this invention, the pedal-
crank shaft a is provided with a roller wheel b, which, through a toothed wheel d,
drives a shaft c that is located between the pedal crank shaft and the axle h of the
[Price 8d.1

page_text: driving-wheel of the cycle, and has fixed to it another toothed wheel e by which it
rotates a roller-wheelf fixed on the said axle. Each of the roller-wheels.b and f
carries, near its periphery, freely rotatable radially arranged conical, cylindrical,
or spherical rollers i into the spaces between which pass the teeth. k of the wheels d
and e. By this means the driving is rendered considerably lighter than with
chain-driving, rolling-friction being substituted for sliding-friction. The shaft e
can, if desired, be mounted in ball-bearings carried by the framework of the
machine.
The connection between the two toothed wheels d and e instead of being rigid,
may be effected by means of a coiled spring m whereby the driving is rendered
elastic, and the dead-points of the crank usually arising during cycling are
obviated, owing to the energy stored up in the spring carrying the pedal-cranks
over the dead-centres. In an arrangement of this kind the shaft e may be divided
and its two parts connected together by a coiled spring m pushed over them as
shown in Figures 1 and 5, the spring in Fig. 1 being made of metal of flat cross
section and in Fig. 5 of circular cross section.
In the modified arrangement shown in Figs. 6 and 7, which is but slightly
different from that illustrated in Figs. 1 to 5, bevel-wheels e', f¹, b¹ and d¹ are
employed. The intermediate shaft is rigid, and not elastic or springy, and is
slipped over one of the stays u of the frame of the cycle, being made hollow for
that purpose. To the one end of the stay u there is secured a screwed rod u on
which is placed a nut uheld in place by lock-nuts u³. Ball bearings v are provided
between the intermediate shaft c' and the stay u and its nut u and serve to reduce
considerably the friction of the intermediate shaft o¹ when rotating about the
stay u.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that what we
claim is
1. Driving mechanism for a cycle, comprising roller-wheels fixed respectively to
the pedal-crank shaft and the driving-wheel of the cycle and provided with freely
rotatable rollers of conical, cylindrical, or spherical form, and a shaft located
between the pedal-crank shaft and the driving-wheel axis and provided with two
toothed wheels with which said roller wheels are in gear, substantially as herein-
before described.
°
2. Cycle-driving mechanism of the kind specified in the preceding claim, in
which, for the purpose of obviating dead-points, the shaft c is divided and the two
parts are connected by a spring m, substantially as hereinbefore described.
C
3. The improved driving-mechanism for cycles, constructed, arranged, and
operating as herein before described with reference respectively to and shown in
Figs. 1 to 5 inclusive, and in Figs. 6. and 7, of the accompanying drawings.
Dated this 27th day of January 1896.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicants.