Improved Speed Gear for Cycles.
Year: 1892

page_text: Date of Application, 12th Jan., 1892
Complete Specification Left, 10th Oct., 1892-Accepted, 3rd Dec., 1892
PROVISIONAL SPECIFICATION.
Improved Speed Gear for Cycles.
I, JAMES SOUTTER MARTIN, of 79 Victoria Road, Dundee, in the County of
Forfar, N.B. Cycle Engineer, do hereby declare the nature of this invention to
be as follows:-
This invention relates to cycles, its object being to provide a means whereby the
wheel driven by the rider may be made to rotate more frequently than the cranks
or pedals.
In carrying out my invention, I rigidly attach a spur wheel to the crank axle
and gear it with another double spur wheel which is carried on a stud in the fork
of the cycle; the said wheel being of a less diameter than the one on the crank
axle, and also less than the other of which it forms a part. Again the larger of
these double wheels gears with another of less diameter fixed to, or part of the
hollow axle, through which the said crank axle goes.
The effect of this combination is as follows -The wheel fixed to the crank axle
causes the double stud wheel to rotate more quickly, and again the said double
stud wheel causes the wheel fixed to or part of the hollow axle to rotate at a still
greater speed, and therefore the cycle wheel is rotated more frequently than the
driving cranks or pedals.
According to another modification, which is preferably applied to existing
machines, carry the crank axles in bearings attached to the fork, the axis of the
said cranks not coinciding with the axis of the cycle wheel, as in my first modi-
fication. Fixed to each crank axle is a spur wheel which gears with an idle wheel
carried by a stud fixed to the fork, said idle wheel gearing with another, in diameter
less than that on the crank axle, and fixed to the axle of the cycle wheel. In this
modification each crank or pedal must be provided with its own train of wheels, in
order to communicate their motion to the cycle wheel.
Dated this 11th day of January 1892.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Applicant's Agents.
COMPLETE SPECIFICATION.
Improved Speed Gear for Cycles.
I, JAMES SOUTTER MARTIN, of 79 Victoria Road, Dundee, in the County of
Forfar, N.B. Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
This invention relates to cycles, its object being to provide a means whereby the
wheel driven by the rider may be made to rotate more frequently than the cranks
or pedals.
The accompanying sheets of explanatory drawings illustrate the method of
carrying out my invention.
Figures 1. and 2. (Sheet 1.) represent sections at B. B. (Figure 2.) and A. A.
(Figure 1.) respectively, and
Figure 3. (Sheet 2.) a side elevation of an ordinary bicycle having my improve-
ment applied.
In these drawings the same reference numerals are used to mark the same or like
parts, wherever they are repeated.

page_text: In carrying out my invention, I rigidly attach or incorporate a spur wheel 4. to
the crank axle 5, and gear it with another double spur wheel 6. 7. which is carried
on a stud 8, in or part of the fork of the cycle-the axis of the stud being eccentric
to the axis of the crank axle ;-the said wheel 6. being of a less diameter than
the one 4. on the crank axle, and also less than the other 7. of which it forms a
part. Again, the larger of these double wheels, namely 7, gears with another 9.
of less diameter fixed to, or part of the hollow axle, through which the said crank
axle 5. goes.
The effect of this combination is as follows:-The wheel 4. fixed to, or incor-
porated with the crank axle causes the double stud wheel 6. 7. to rotate more
quickly, and again the said double stud wheel, causes the wheel 9. fixed to, or part
of the hollow axle to rotate at a still greater speed, and therefore the cycle wheel 10.
is rotated more frequently than the driving cranks or pedals 11.
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 :-
(1.) The hereinbefore indicated improved speed gear for cycles, substantially as
described and illustrated.
Dated this 8th day of October 1892.
GEO. C. DOUGLAS & Co.,
41, Reform Street, Dundee, Agents for Applicant..