Improvements in Driving Gear for Velocipedes and other like purposes.
Year: 1891

page_text: Date of Application, 13th Oct., 1891
Complete Specification Left, 13th July, 1892-Accepted, 27th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Velocipedes and other like
purposes.
WILLIAM THOMAS SHAW Director and ARTHUR SYDENHAM Works Manager
of the Crypto Cycle Co. Limited of No. 64 City Road, London E.C. do hereby
declare the nature of this invention to be as follows :—
Our invention consists in an improved driving-gear for bicycles, tricycles and
other like purposes whereby the driving wheel is caused to revolve at a higher
velocity than that of the crank-axle. Preferably our improved gear is built as an
integral part of the axle and hub of the driving wheel, but it may, if so desired, be
formed as a driving box on the pedal shaft of a tricycle or bicycle, in which case
the box or cylinder rotated at the increased velocity is armed with pitch-teeth or
other suitable means of conveying the motion to the driving wheel. When our
said improved gear forms a portion of the hub of the driving wheel, we construct
it on the following plan. The fork within which the driving wheel runs carries
ball-bearings at the two lower ends through which freely runs an axle armed with
cranks and pedals or other convenient means of propulsion.
The hub of the driving wheel is not fixed to the axle so as to move at the same
velocity, but is connected with the axle by the interposition of mechanism which
imparts to it a higher velocity as under. The fork-end on one side is enlarged into
a tubular form continued inwards for a short distance and exactly embracing the
axle. The external surface of this portion is formed into a spur-wheel, which is
held fast and prevented from rotating by reason of its being firmly fixed to or in
one piece with the fork-end. By the side of this wheel a second spur-wheel of some-
what larger diameter is formed upon the axle and of course moves round with it.
This is the motor wheel of the mechanism.
Beyond this wheel is placed the hub-flange which is of special construction_as
noted below, and at its periphery sails over towards the fork, forming a short cylinder
which encloses the mechanism. The hub flange proper carries four equi-distant
studs or spindles upon which are placed broad pinions of a total width equal to the
combined width of the two spur-wheels described above. These broad pinions are
of two different diameters, the smaller end gearing with the motor wheel, and the
larger end with the wheel fixed to the fork. The spindles on which the two ended
pinions run are supported on the side next the fork by a broad flat ring fitted
tightly into a recess formed on the inside of the cylindrical continuation of the
hub. The flat ring thus forms on that side a casing for the gear-wheels which are
in this way perfectly enclosed. It also carries, in the intervals between the
spindle-ends, four equi-distant supports at right angles to its inner surface and
of such a length as to butt against the inside surface of the hub-flange to which
they are firmly screwed from the outside. It will be obvious that this arrange-
ment of pinions forms an epicyclic train, and that upon the motor wheel being set
in motion, the broad pinions will be rotated on their spindles. But besides being
rotated, the broad pinions being in gear with the fixed wheel, will receive a motion
of translation, and will carry round with them the hub flange at a higher velocity
than that of the axle. The amount of increase depends upon the ratio which the
various components of the train bear to each other. The special hub-flange
described above has a web or projecting ring on its cylindrical portion to carry
the spokes, and is continued by a tube to the other end of the hub where is B
flange of the ordinary kind for the reception of the spokes on that side.
follows the fork-end on that side with ball-bearing for the axle. The hub proper
also runs upon the axle supported by a ball-bearing at either end and the broad
Then

page_text: pinions are likewise provided with ball-bearings at either end, upon their respective
spindles.
In all cases we make the ball-bearings adjustable so as to take away any side
shake occasioned by wear and tear.
Dated this Thirteenth day of October 1891.
WM. THOS. SHAW.
ARTHUR SYDENHAM.
COMPLETE SPECIFICATION.
Improvements in Driving Gear for Velocipedes and other like
purposes.
WILLIAM THOMAS SHAW Director, and ARTHUR SYDENHAM Works Manager
of the Crypto Cycle Company Limited of No. 64 City Road London E.C. 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 :-
Our invention consists in an improved driving-gear for bicycles, tricycles and
other like purposes whereby the driving wheel is caused to revolve at a higher
velocity than that of the crank-axle. Preferably our improved gear is built as an
integral part of the axle and hub of the driving wheel, but it may, if so desired, be
formed as a
driving box on the pedal shaft of a tricycle or bicycle, in which
case the box or cylinder rotated at the increased velocity is armed with pitch-
teeth or other suitable means of conveying the motion to the driving wheel.
When our said improved gear forms a portion of the hub of the driving wheel, we
construct it on the following plan:-The fork F within which the driving wheel runs
carries ball-bearings B at the two lower ends through which freely runs an axle A
armed with cranks and pedals or other convenient means of propulsion. The hub H
of the driving wheel is not fixed to the axle so as to move at the same velocity,
but is connected with the axle by the interposition of mechanism which imparts to
it a higher velocity as follows:-
The bearing B in the fork-end F on one side is enlarged into a tubular
form T continued inwards for a short distance and exactly embracing the axle A.
The external surface of this portion is formed into a spur-wheel S, which is held
fast and prevented from rotating by reason of its being firmly fixed to or in one
piece with the bearing B of the fork-end. By the side of this wheel a second
spur-wheel S' of somewhat larger diameter is formed upon the axle and of course
moves round with it. This is the motor wheel of the mechanism. Beyond this
wheel is placed the bub-flange H³ which is of special construction, as noted below,
and at its periphery sails over towards the fork forming a short cylinder H³ which
encloses the mechanism. The hub-flange proper H³ carries four equi-distant studs
or spindles P upon which are placed broad pinions W of a total width equal to the
combined width of the two spur-wheels S and S described above. These broad
pinions are of two different diameters the smaller end gearing with the motor
wheel S and the larger end with the wheel S fixed to the bearing B in the fork
end. The spindles on which the two-ended pinions run are supported on the side
next the fork by a broad flat ring R fitted tightly into a recess formed on the
inside of the cylindrical continuation of the hub H. The flat ring thus forms on
that side a casing for the gear wheels which are in this way perfectly enclosed.
It also carries, in the intervals between the spindle-ends, four equi-distant supports
at right angles to its inner surface and of such a length as to butt against the
inside surface of the hub-flange H to which they are firmly screwed from the
outside. It will be obvious that this arrangement of pinions forms an epicyclic
train, and that upon the motor wheel S' being set in motion, the broad pinions W
will be rotated on their spindles. But besides being rotated, the broad pinions
being in gear with the fixed wheel S, will receive a motion of translation, and will

page_text: carry round with them the hub-flange H' at a higher velocity than that of the
axle A. The amount of increase depends upon the ratio which the various
components of the train bear to each other. In the combination shown in our
drawing, S has 14 teeth, S 19 teeth, and the broad pinion 18 teeth and 13 teeth
respectively in its two diameters. This train gives approximately 100 to 214 as the
velocity-ratio of the axle and hub respectively. The special hub-flange described
above has a web or projecting ring on its cylindrical portion to carry the spokes,
and is continued by a tube U to the other end of the hub where is a flange of the
ordinary kind for the reception of the spokes on that side. Then follows the fork-
end F on that side with ball-bearing B for the axle. The hub proper also runs
upon the axle supported by a ball-bearing at either end B' and B' and the broad
pinions W are likewise provided with ball-bearings W' at either end upon their
respective spindles.
In all cases we make the ball-bearings adjustable so as to take away any side
shake occasioned by wear and tear.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
A
gear constructed, and applied substantially in the manner and for the purposes
herein illustrated and described.