improved Driving Gear for velocipedes.
Year: 1897

page_text: Date of Application, 3rd May, 1897
Complete Specification Left, 31st Jan., 1898-Accepted, 19th Mar., 1898
I, FRIEDRICH HEYN, of 8, Augustenstrasse, Wilhelmshaven, Germany, Torpedo-
Gunner, do hereby declare the nature of this invention to be as follows:-
The object of my invention is to enable the rider to put his legs through a motion
similar to the motion in walking. At the same time the use of the driving chain,
which is always a source of more or less trouble, and often of serious injury, is
obviated.
I fasten unto the hub of the hind wheel a small toothed wheel, which engages
the teeth of a larger toothed wheel, this latter finding its bearing in the right leg
of the rear fork. The large toothed wheel runs between this right leg and the hind-
wheel.
The axle of said toothed wheel, projecting outwardly, is bent so as to form
a crank. A rod is pivotally jointed to the free end of said crank and a like rod
is pivotally jointed to the inside of the toothed wheel, both having the same distance
from the axle of the toothed wheel, but being arranged at an angle of 180° to each
other. These two rods are pivotally jointed with their other ends to the short arms
of two rectangular treadle-levers, on the longer arms of which are journaled the
pedals. The right hand,treadle is made of one piece, whilst the left one is composed
of two lever arms, fastened on the treadle axle at right angle to each other. By
moving the pedal arms alternately up and down, the short arms by means of the
rods will rotate the large toothed wheel, the teeth of which will rotate the small
toothed wheel and thereby the hind wheel in the opposite direction.
Dated this 26th day of April 1897.
FRIEDRICH HEYN.
improved Driving Gear for velocipedes.
I, FRIEDRICH HEYN, of 8, Augustenstrasse, Wilhelmshaven, Germany, Torpedo-
Gunner, 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;―
The object of my invention is to enable the rider to put his legs through a motion,
similar to the motion in walking or ascending a flight of stairs. Instead of the
rotary pedal crank motion I provide a treadle arrangement and connect the treadle
levers with the driving hind wheel by means of draw rods and toothed wheels,
thereby doing away with the driving chain, which is always a source of trouble,
if not of serious injury.

page_text: In order to make my invention more easily understood, I have illustrated it on
the accompanying sheet of drawings, of which Fig. 1 shows a side view of the
improved driving gear and Fig. 2 is a top view of same.
I fasten unto the hub a of the hind driving wheel a small toothed wheel b
which engages the teeth of a larger toothed wheel c, this latter being journalled in
the right leg of the horizontal rear fork d. Both toothed wheels run between said right
leg and the hind wheel a. The axle f of the larger toothed wheel c, being carried
through the fork leg, is then bent rectangularly and forms a crank, to the free end
of which a draw rod g is pivotally jointed, as at f. A like draw rod is pivotally
jointed to the inside of the large toothed wheel c at h¹. The two points f¹ and
are situated diametrically opposite each other and at the same distance from the
axis of the toothed wheel c. The two draw rods g and are-jointed with their other
ends to the short arms and respectively of the two treadle levers, the longer
arms and o of which carry the pedals and
The treadle lever i, n is made of one piece and its axle is journalled in the
hollow axle s, which latter in its part is journalled in the ball bearing t.
To one end of the hollow axle's is fastened the long arm o and to the other end,
at the desired angle, the short arm k, as clearly shown in Fig. 2.
Ball bearings can preferably be made use of throughout. By moving the pedals
alternately up and down, the treadle levers will execute a rocking motion and this
motion will be transmitted by the draw rods to the large toothed wheel, when it
will rotate the latter in one direction and thereby the small toothed wheel and the
hind driving wheel in the other direction.
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 :--
In a driving gear for bicycles in combination two treadle levers, the longer arms
of which carry the pedals, and to the shorter arms of which are pivotally jointed
the draw rods g and h, this latter being pivotally fastened to one side of a large
sprocket wheel, journalled in one leg of the hind wheel fork and the former being
pivotally fastened to the cranked axle f of said sprocket wheel C. which latter
engages a small sprocket wheel b, fastened unto the hub a¹ of the hind driving
wheel a, substantially as described.
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