Year: 1898

page_text: I, ROBERT FULLERTON, of 31, Angle Park Terrace, Edinburgh, North Britain,
Mill Worker, do hereby declare the nature of this invention to be as follows:---
This invention relates to means for changing the gearing of a bicycle; or other
cycle or motor, to any two gears.
I employ two sprocket wheels, of different sizes, keyed side by side on the crank
axle of a bicycle; and I have two small cogged wheels on the rear or driving
wheel, with separate driving chains for each. Between two small cogged wheels
is a clutch keyed upon the axle but capable of lateral movement on a feather or
key, the arrangement being such that by moving the clutch to the one side or the
other, either of the two small cogged wheels can be held fast so as to drive the
bicycle. When the clutch is in a midway position between two wheels, they
revolve inactively on the axle so that in running down hill for example, by placing
the clutch out of gear of either of the two small cogged wheels, the cranks may
remain stationary. The clutch may be operated in any convenient manner from
the riders seat by means of any convenient rod or chain so arranged that by
actuating the rod or chain with the riders hand, the clutch is moved in order to
gear with the one or other of the small cogged wheels, the one cogged wheel being
in connection by means of its chain with the larger procket wheel of the crank
axle: the other cogged wheel being in communication by means of its chain
with the smaller sprocket wheel. It will thus be seen that a high or low gear may
be instantly obtained by the rider without dismounting.
D
011
1909
JOHNSONS.
Petitioner's Agents, 115, St. Vincent Street, Glasgow,
I, ROBERT FULLERTON, of 31, Angle Park Terrace, Edinburgh, North Britain,
Mill Worker, 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 relates to means for changing the gearing of a bicycle, tricycle,
or other cycle or motor, to any two gears.
In accordance with my invention I employ two sets of sprocket wheels and
[Price Sd

page_text: chains, one of high and the other of low gear, and in order that one or other may
be brought into use at the will of the rider, or both be thrown out of gear to
allow the pedals to remain stationary whilst descending an incline, a suitable clutch
is arranged upon the axle of the rear or driving wheel of the cycle which can be
operated by the rider without dismounting.
But in order that my said invention may be more readily understood and easily
carried into effect I will proceed to describe the same with reference to the accom-
panying drawings in which
Fig. 1 is an elevation of a cycle, with parts of the framing broken away.
Fig. 2 is a plan of the hub and axle of the cycle driving wheel and
Fig. 3 is a rear view of a portion of same shewing more particularly the means
for actuating the clutch.
Fig. 4 is a detail view of a portion of the clutch and cne of the loose cog wheels,
shewing the formation of the engaging teeth.
Referring to the said drawings I employ two driving sprocket wheels A, A', of
different sizes, keved side by side on the crank or driving axle B of the cycle, or
motor. Two small cogged wheels C C¹ are mounted upon the extension D of the
hub of the driving wheel so that they can rotate freely thereon, and are both
driven from their respective wheels A A' by separate chains E. Between the
two wheels C C is a clutch F working on a feather or feathers f so that it is
capable of lateral movement whilst rotating with the hub of the wheel, the arrange-
ment being such that by moving the clutch to the one side or the other, either of
the two small wheels CC can be held fast so as to drive the cycle, the other riding
inactively upon the hub extension. When the clutch is in a midway position
between the two wheels, which is the position illustrated in the various figures of
the drawings, they both revolve inactively so that, in running down hill for
example, the cranks may remain stationary.
The clutch is preferably constructed as shewn more particularly in detail Fig. 4
that is to say with angled or inverted teeth fi so that when engaged with the
teeth of one or other of the loose cogs, which are correspondingly shaped, the two
become locked together preventing their being disengaged unless by the will of
the rider. The clutch may be operated from the rider's seat by means of a rod G
actuated by a lever pivoted at g, the said rod being formed with a concave
curved portion, where it passes through the guide H. This portion acts
upon the corresponding convex curved surface of the clutch fork J, which is
pivoted at within the guide H, in such a manner that when the rod G is lowered
the upper portion of the curve of 2 hears upon the upper portion of the curved
surface of the clutch fork, thus displacing it and throwing the clutch into gear
with the cog wheel the reverse happening when the rod G is raised. The
guide His shewn secured to the back stav K of the cycle frame but I desire it to be
understood that it may be secured to the lower horizontal stav K¹ or other con-
venient part of the framing and that any suitable means may be employed for
operating the rod of the clutch either actuated from a position similar to that
shewn with regard to the lever g, or from the handle bar or otherwise.
Also if desired a suitable rack, or its equivalent, may be employed with the
lever g, or other means, for determining exactly the various positions to which
the lever, or its equivalent, must be placed to bring the clutch into either of the
three positions desired.
As only one of the chains can be adjusted correctly by the usual adjusting means
an idler" guide or tension wheel L revolving in an arm pivoted at 11 and acted
upon by a spiral or other spring as shewn, may be employed with the chain of
the high gear for taking up the slack and preventing the chain rattling. A stop 72
may be formed on the clamp carrying the swivelling pin to prevent the wheel
from being raised clear of the chain.
The loose cog wheels although shewn as mounted in solid bearings are preferably
fitted with ball bearings to facilitate their running.

page_text: As a modification, the same or similar arrangements to those herein before
described and shewn. may be applied to the driving chain wheels in lieu of to the
driven cog wheels.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim 18:
1. The means for changing the gearing of a bicycle or other cycle or motor, con-
structed, arranged and operating, substantially in the manner as hereinbefore
described and shewn in the accompanying drawings.
2. In bicycles, tricycles, and motors, the employment of two sprocket wheels, of
different diameters, keyed upon the driving axle and communicating their motion
by two sprocket chains to twe loose sprocket wheels upon the driven wheel,
arranged substantially in the manner as and for the purpose herein before
described and shewn in the accompanying drawings.
3. In means for changing the gearing of a bicycle or other cycle or motor, the
clutch mounted upon the hub extension of the driven wheel, and the means for
operating same, whereby one or other of the two loose sprocket wheels of the
driven wheel may be engaged to drive the wheel, or both be disengaged, substan-
tially in the manner as and for the purpose herein before described and shewn in
the accompanying drawings.
Hated th. 15th of Than 1908
JOHNSONS,
Applicant's Agents, 115, St. Vincent Street, Glasgow.