Year: 1897

page_text: I, RUDOLF GOLDSCHMIDT, of 58, Kies Strasse, Darmstadt (Grand Duchy of
Hesse), Germany, Electrical Student, do hereby declare the nature of this inven-
tion to be as follows:-
This invention consists in a peculiar mode of applying friction wheel gearing
to the propulsion of cycles.
According to this invention the transmission of motion from the pedal or crank
axle wheel (situated at the outer side of the hind frame stay of a safety bicycle)
to a wheel situated at the inner side of said stay and rigidly connected to the hub
of the hind wheel by means of friction wheel gearing by the interposition of an
intermediate friction ring or annular friction wheel of farger diameter than the
distance between the peripheries of the driving and driven wheels and arranged
with its centre slightly out of the line of centres of those wheels. It is guided
and held with the requisite frictional pressure by reason of its relative position
and by being pressed into engagement with the grooves of the driving and driven
friction wheels by means of a pressing and guiding wheel mounted on the hind
wheel stay.
The accompanying drawings illustrate this invention.
The pedal or crank axle has a grooved friction wheel B and the hub c of
the hind wheel carries a corresponding smaller friction wheel C. The inter-
mediate friction ring D engages peripherally in the grooves of the two wheels
and its centre d is slightly below the line of centres of those two wheels and the hind
wheel stay f which passes through the ring D. The ring D is securely maintained
in position by the pressing and guiding roller E mounted on a supporting screw
and nut H fixed on the stay f. The roller E bears against the interior of the
ring D which by its rotation tends to move. between the two friction wheels BC.
This new gear possesses by reason of its simplicity practical advantages over
chain gear which is liable to become clogged with dirt, to stretch, and to break.'
The action is extremely smooth and the friction surfaces can slip in case of
excessive sudden or continued strain which would otherwise cause breakage.
The driving gear is also specially suitable for use in riding up-hill.
Dated this 17th day of September 1897.

page_text: I, RUDOLPH GOLDSCHMIDT, of 58, Kies Strasse, Darmstadt (Grand Duchy of
Hesse), Germany, Electrical Student, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
This invention consists in a peculiar mode of applying friction wheel gearing
to the propulsion of cycles.
According to this invention the transmission of motion from the pedal or crank
axle wheel (situated at the outer side of the hind frame stay of a safety bicycle)
to a wheel situated at the inner side of said stay and rigidly connected to the hub
of the hind wheel by means of friction wheel gearing is effected by the interposi-
tion of an intermediate friction ring or annular friction wheel of larger diameter
than the distance between the peripheries of the driving and driven wheels and
arranged with its centre slightly out of the line of centres of those wheels. This
friction ring is guided and held with the requisite frictional pressure by reason
of its relative position and by being pressed into engagement with the grooves of
the driving and driven friction wheels by means of a pressing and guiding wheel
mounted on, the hind wheel stay.
The drawings accompanying the Provisional Specification illustrate this
invention.
The pedal or crank axle a has fast upon it a grooved friction wheel B, and on
the hub of the hind wheel is fixed a corresponding smaller friction wheel C,
these two wheels. being at opposite sides of the back stay f. The intermediate
friction, ring engages peripherally in the grooves of the two wheels B and C,
the centre of the ring D which is represented by the point d being slightly below
the line of centres of the two wheels B and C and therefore below the back stay f
which passes through the ring D. The ring D is securely. maintained in position
by a roller mounted on a bracket clamped by a screw and nut H to the stay f.
The roller E bears against the interior of the ring I and holds it up so as to main-
tain it in frictional contact with the wheels BC the tendency, owing to the
direction of rotation, being to move the ring upwards between the two friction
wheels BC.
This new gear possesses, by reason of its simplicity, practical advantages over
chain. gear which is liable to become clogged with dirt, to stretch, and to break.
The action is extremely smooth and the friction surfaces can slip in case of
excessive sudden or continued strain which would otherwise cause breakage. The
driving gear is also specially suitable for use in riding up-hill.
".
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. A driving mechanism for cycles consisting in the combination with friction
wheels on the pedal crank axle, and on the hind wheel hub situated at opposite
sides of the back stay, of an intermediate friction ring through which the back
stay passes in frictional gear with both. wheels substantially as described..
2. A driving mechanism for cycles consisting in the combination with friction
wheels on the pedal crank axle, and on the hind wheel hub situated at opposite
sides of the back stay, of an intermediate friction ring through which the back
stay passes in frictional gear with both wheels and of a diameter greater than

page_text: the distance between them, the centre of the intermediate ring being out of the
line of centres of the pedal and hind wheel axles.
3. A driving mechanism for cycles consisting in the combination with friction
wheels on the pedal crank axle, and on the hind wheel hub situated at opposite
sides of the back stay, of an intermediate friction ring through which the back
stay passes in frictional gear with both wheels and of a diameter greater than the
distance between them, the centre of the intermediate ring being below the line
of centres of the pedal and hind wheel axles and being held up in gear therewith
by a roller mounted on the back stay and bearing against the interior of the ring
substantially as specified.
Dated this 16th day of June 1898
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.