Improvements in Driving Mechanism for Cycles.
Year: 1895

page_text: Date of Application, 2nd Jan., 1895-Accepted, 23rd Nov., 1895
COMPLETE SPECIFICATION.
Improvements in Driving Mechanism for Cycles.
I, AUGUST URBAN of Preichau near Steinau on the Oder in Germany,
Schoolmaster, 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:-
Fig. 1 shows the side- and back-view of the hind-wheel and the lever-system.
Fig. 2 is a vertical section of the hind-axle.
Fig. 3. Arrangement of the keys (side-view and plan).
On the tread-axle a (Fig. 1) are placed two chain-wheels b and c of different
size which are connected by two chains with the corresponding chain-wheels b1 c1.
The latter wheels are loosely fixed in the furrow of the rings d.2 (Fig. 2) on the
axle d of the hind-wheel and each of them has provisionally on the inner side
a coupling box 62 c 2, which can be coupled with the corresponding coupling-
boxes 3 respective c 3 of the hind-wheel-hub.
For this purpose the axle d (Fig. 2) of the hind-wheel is hollow and in the same
a slider 1 is moved to and fro, which is combined on the left side of the cycle
with a ring d 2. This combination is effected by a pin e 1, which from the middle
circumference of the ring d 2 passes through a longitudinal slit 2 in the body of
the cone and of the axle d which are made from one piece.
Thereby that the chain-wheels 1 respective c 1 rotate firstly in the furrow of the
rings d 2, they can be engaged and disengaged at the same time by means of
the slide-bar d.1.
At the right side of the axle d (Fig. 2) the ring d2 is joined with the slider d 1
by two pins f2. The pins are removable by means of nuts f3.
As mentioned in the beginning the engaging and disengaging of the chain-wheels
can be effected from the seat of the rider. For this purpose the slider & 1 is joined
by a fitting joint to the rectangular-lever f (Fig. 1 and 2) which is in connection
with the bar m by a bar h which works by the action of a spring 9. Joint-piece n
joints bar m with the coupling lever respective key o (see Fig. 1 and 3).
According to the turning of the key o the coupling-boxes 62 c2 (Fig. 2) can be
engaged or disengaged. To avoid a disengaging of the coupling-boxes by them-
selves during the propulsion, there is applied a safety-adjustment which permits
three positions of the coupling-boxes.
There are possible three positions as follows:
1. Box c 2 may be engaged and b 2 disengaged.
2. Box 2 is engaged and c 2 disengaged.
3. Both boxes are disengaged.
The safety-adjustment (Fig. 3) provisionally consists of two pointed clicks q and
which can be turned at r in the guide and which are generally pressed upwards by
means of springs. Is the lever o pressed downwards than lever m will be moved
in the direction of the dart (Fig. 3), so that the nose m 1 of the same catches in one
of the clicks Or whereby the lever m and thereby also the coupling boxes are
hold fast. By means of the knobs respective of the keys p 1 respective o 1, which
can be moved in the slits of the guide the clicks can be pressed downwards and
by that the lever m respective nose m 1 can be redisengaged momentaneously. The
arrangement can be made in the manner that if the nose m 1 (Fig. 3) rests in the
click p then the box 62 is engaged. If m 1 rests in g then are both boxes disengaged.
But if the nose m 1 is in the position traced in Fig. 3, then 62 is disengaged and

page_text: c2 engaged. For this purpose there is no click wanted, as the spring g prevents in
this position a disengaging of the box, for the pin g strikes upon the butt g 2.
If in a special case one likes to bring continually out of use one chain, then the
same can be easily removed.
The isolated boxes b 2 c 2 can be completely guarded against the entering of dirt
by screwing upon them thin metallic cases.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
Contrivance in cycles so arranged that by pressing downwards keys a driving of
different transpositions, working on both sides can be momentany engaged and
disengaged respective the cycle can be disengaged from the seat of the rider.
The contrivance for effecting the coupling with driving-contrivances for cycles
with two disengaging and engaging chain-wheels of different size arranged on
both sides of the wheel-axle, which chain-wheels rotate upon ball bearings of the
rings d 2.
The combination of the rings d 2 with the slider d 1 in the hollow-driving-axle d
by pin e 1, which pin on the left side of the cycle passes through a longitudinal
slit e 2 in the body of the cone and of the axle d, which are made from one piece.
The arrangement of the lever-mechanism from the rectangular lever to the
lever m in the tube of the machine. Lever m is hold fast in different positions by
several elastic clicks p q, which are placed one after another. Each of the clicks
has a pressure knob p 1 q1 passing through the wall of the guide, for the purpose to
hold fast in different positions the lever m and to redisengage it momentaneously
by moving the pressure knobs.
Dated this 23rd day of March 1895
AUGUST URBAN.