IMPROVEMENTS IN DRIVING GEAR APPLICABLE TO VELOCIPEDES AND OTHER VEHICLES"
Year: 1883

page_text: LETTERS PATENT to David Carter, of Stratford-on-Avon, in the County of
Warwick, Tricycle maker for an Invention of "IMPROVEMENTS IN DRIVING
GEAR APPLICABLE TO VELOCIPEDES AND OTHER VEHICLES"
PROVISIONAL SPECIFICATION left by the said David Carter at the Office
of the Commissioners of Patents on the 3rd September 1883.
DAVID CARTER, of Stratford-on-Avon, in the County of Warwick, Tricycle
maker, "IMPROVEMENTS IN DRIVING GEAR APPLICABLE TO VELOCIPEDES AND
OTHER VEHICLES,
"
My invention relates to driving gear applicable to velocipedes and other vehicles.
It is designed to permit of compensating differential rotation when a pair of wheels
is traversing a curve, to provide an alternative fast and slow driving gear, and to
obviate any side shake of the wheels.
:―
The nature of my device is as follows:-
Accurately fitting but free to turn upon the main axle of the vehicle are two
sleeves, rigid with the bearing wheels. These two sleeves are each keyed to a
wheel on either side of the driving drum. One of these wheels is bevilled and
cogged externally and the other internally. Through the driving drum, in an oblique
tubular bearing, is a roller, the ends of which are cogged, one end to gear
epicyclically with the externally cogged wheel, and the other end to gear
hypocyclically with the internally cogged wheel. In action, when the vehicle is
travelling straightforward, the whole revolves together, the epicyclic roller being
locked, acting simply as a driver; but immediately the vehicle enters upon a curve
the epicyclic roller permits and compensates the differential rotation of the wheels
from one to the other. The long sleeves to which the bearing wheels are fixed
obviate any side shake.
'
In combination with this device I may use a fast and slow driving gear as
follows:-
To the outside of the driving drum I fit two alternative sprocket wheels of
different diameters, either of which may be put into gear with the driving drum
by a suitable clutch. Or the sprocket wheels on the crank axle may be of different
diameters. Thus, in either case, by putting one or other of the wheels into gear,
I can use either a faster or slower speed.

page_text: "
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said David Carter in the Patent Office on the 3rd March 1884.
DAVID CARTER, of Stratford on Avon, in the County of Warwick, Tricycle
Maker, "IMPROVEMENTS IN DRIVING GEAR APPLICABLE TO VELOCIPEDES AND
OTHER VEHICLES
"
My invention relates to driving gear applicable to velocipedes and other vehicles.
It is designed to permit of compensating differential rotation when a pair of wheels
is traversing a curve, and to obviate any side shake of the wheels.
In order that my invention may be clearly understood, I now proceed to
describe the same in relation to the drawings hereunto annexed, and with reference
to the letters and figures marked thereupon. Like letters refer to like parts
throughout the figures.
Figure 1 shows my device in longitudinal section
Figure 2 shows cross section of the same at one end of the longitudinal section,
through Y Y.
Figure 3 shows cross section of the same at one end of the longitudinal section,
through Z Z.
Accurately fitting, but free to turn upon the main axle A of the vehicle are two
sleeves E and G, rigid with the bearing wheels. These two sleeves are respectively
keyed to wheels D and F on either side of the driving drum B. One of the
wheels D is bevelled and cogged externally, and the other wheel F is a trough
wheel and is cogged internally. Through the driving drum B, in an oblique
tubular bearing, is a roller C, the ends of which are cogged, one end to gear
epicyclically with the externally cogged wheel D (figure 2) and the other end to
gear. hypocyclically with the internally cogged trough wheel F (figure 3). In
action, when the vehicle is travelling straightforward, the whole revolves together,
the epicyclic roller C being locked and acting simply as a driver; but immediately
the vehicle enters upon a curve, the epicyclic roller permits and compensates the
differential rotation of the wheels from one to the other. The long sleeves G to
which the bearing wheels are fixed obviate any side shake.
Having now fully described and ascertained the nature and objects of my
invention and the manner of its performance, be it known that what I consider
novel and claim is:-
First. The combination with the driving drum of velocipedes and similar
vehicles, of a roller working in an oblique tubular bearing, gearing at one end
epicyclically with an externally cogged wheel rigid with one of a pair of bearing
wheels, and gearing at its other end hypocyclically with an internally cogged
trough wheel rigid with the other of the pair of bearing wheels, to permit and
compensate differential rotation from one bearing wheel to the other, substantially
as set forth.
Second. The combination with the driving drum of velocipedes and similar
vehicles and bearing wheels of long sleeves accurately fitting but free to turn upon
the axle to effect rigid connection between said wheels and drum and to prevent
side shake substantially as set forth.
In witness whereof I, the said David Carter, have hereunto set my hand and
seal this twenty-ninth day of February in the year of our Lord one thousand
eight hundred and eighty-four.