An Improved System of Driving Gear for the Propulsion of Velocipedes.
Year: 1891

page_text: Date of Application, 7th Nov., 1891:
Complete Specification Left, 25th July, 1892-Accepted, 1st Oct., 1892
PROVISIONAL SPECIFICATION.
An Improved System of Driving Gear for the Propulsion of
Velocipedes.
GEORGE BEBBINGTON 17 Conduit Road Plumstead in the County of Kent
Engineer do hereby declare the nature of this invention to be as follows:-
My invention relates principally to an arrangement of small spur wheels, and
pinions, for the propulsion of velocipedes; in preference as a front driving machine
(but the same arrangement of wheels, and pinions, can be used on a rear-driving
machine-by a modification in the form of using it) to gear up a machine to
any ratio of speed-as required to obtain this result, I proceed in the following
manner construct a cycle wheel of suitable material with a hole through the
centre of the hub, to admit the crank spindle to work freely through the centre of
the cycle wheel, also on one (or both ends) end of the hub I fix a pinion containing
14 teeth (or any other number as required) either keyed on or made out of one
piece of metal with the hub, and on the crank spindle I key on a wheel (say)
containing 21 teeth, also on a bush, (or hollow spindle) I key on a wheel
containing 21 teeth, and a pinion containing 14 teeth, which I term the stud wheel,
and pinion, these will revolve together, and make the same number of revolutions in
a given time.
Also on the ends of the fork of cycle I provide suitable bearings for the cycle
wheel to revolve in freely, and at the required distance from the centre of the fork
bearings, I bore a hole to carry a stud-this stud I make concentric, or excentric
as required and on this stud I fix the wheel and pinion that are keyed on the above
mentioned bush.
I then place the cycle wheel in position in the bearings at the fork ends then
place the crank spindle through the centre of the hub of cycle wheel, then key on
the two cranks; then for every revolution of the cranks, the cycle wheel will make
2 revolutions; so that if the cycle wheel is 28 inches in diameter it will be geared
up to 63 inches.
If two sets of gearing is required of different ratios of speed I provide, and fix
a pinion on each end of the hub one of the pinions having-say one, or two more
teeth than the other, and if the gearing is required to be altered from high speed,
to low, while in motion, I make the above mentioned stud (which carries the stud
wheel, and pinion) excentric, and by providing one for each of the fork ends-
carrying a wheel, and pinion, on each of the studs, also by keying on a wheel on
each end of the crank spindle, one wheel to contain one, (or more) teeth than the
other as may be required.
Then by turning either of these excentric studs about half a revolution it will
throw the gear in, 'or out, as required.
But if the speed is not required to be altered while in motion, the cycle wheel
can be reversed in the bearings; and if the pinion on the hub has 15 teeth, then
by taking off the stud wheel with 21 teeth, and replacing it with a wheel having
20 teeth, this will alter it from 63 inches, to 56 inches.
Dated this 5th day of November 1891.
COMPLETE SPECIFICATION.
An Improved System of Driving Gear for the Propulsion of
Velocipedes.
I GEORGE BEBBINGTON of 17 Conduit Road, Plumstead in the County of Kent,
Engineer do hereby declare the nature of this invention and in what manner the
[Price 8d.]
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page_text: same is to be performed, to be particularly described and ascertained in and by
the following statement :-
My invention relates principally to an arrangement of small spur wheels, and
spur pinions, for the propulsion of velocipedes in preference as a front driving
machine (but the arrangement of wheels, and pinions, can be used on a rear
driving machine, by a modification in the manner of application) to gear up a
machine to any ratio of speed as may be required to obtain this result 1 proceed in
the following manner :-
I construct a cycle wheel of suitable materials, with a hole through the centre
of the hub I Fig. 1 to admit the crank spindle S Fig. 1 to work freely through the
centre of the cycle wheel.
Also on one end (or both ends) of the hub I fix a pinion D Fig. 1 containing 14 teeth
(or any other number) either keyed on or made out of one piece of metal with the hub,
and on the crank spindle S Fig. 1 I key on a wheel A Fig. 1 containing 21 teeth (or
any other number) also on a bush, or hollow spindle, I key on a wheel C Fig. 1
containing 21 teeth (or any other number) and a pinion B Fig. 1 containing 14 teeth (or
any other number) which I term the stud wheel, and pinion, these will revolve together
and make the same number of revolutions in a given time, or otherwise. I make
this bush solid with pinion B and key on the wheel C as shewn in Fig. 1 either to
work on a plain bearing, or on balls as may be required. Also on the ends of the
fork H of cycle I provide suitable ball bearings E Fig. 1 for the cycle wheel to
revolve in freely and at the required distance from the centre of the fork bearings E,
I bore a hole F Fig. 1 to carry a stud G Fig. 1 this stud to be concentric, or
excentric, as may be required, and on this stud G Fig. 1 I fix the wheel C, and
pinion B that are united, and to revolve together on the stud G; I then fix the
several parts in their proper positions, and for every revolution of the crank the
cycle wheel will revolve 2 times (or any other number that may have been
determined upon in fixing the relative proportions that the wheels, and pinions,
should bear to each other) so that if the cycle wheel is 28 inches in diameter
it will be geared up to 63 inches; by the above arrangement of wheels, and
pinions, I obtain a multiple gear from two centres. If two sets of gear is
required of a different ratio of speed to each other, I provide a pinion on each
end of the hub I Fig. 1 one pinion to have more teeth than the other pinion,
and the other wheels, and pinion, for the 2nd set of gear to be of suitable
proportions as required and should the gear be required to be altered from high, to
low, while in motion, I make the stud G Fig. 1 excentric (and provide one for each
fork) and by turning these studs about half a revolution it will throw the gear in,
or out, as required; but if the speed of the cycle is not required to be altered
when in motion, the cycle wheel can be reversed in the bearings E and if the
pinion on the reversed end of the hub has 15 teeth, then by taking off the stud
wheel C having 21 teeth and replace it with a wheel having 20 teeth, this will alter
it from 63 to 56 inches.
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 is.:-
1st. The invention, or application of an arrangement of spur gear, consisting of
two spur wheels, and two spur pinions, aud to be so placed in the particular position
to each other, with the several modifications, and for the particular purpose, as
herein shewn, and fully explained in this my Complete Specification.
2nd. And I make this claim irrespective of the size, or shape, of the said wheels,
and pinions, or of the shape, pitch, or number of the teeth.
Dated this 19th day of July 1892.
GEORGE BEBBINGTON.