Improvements in Driving Mechanism for Bicycles and the like.
Year: 1897

page_text: Date of Application, 6th Oct.,
1897.
2000
PROVISIONAL SPECIFICATION.
Improvements in Driving Mechanism for Bicycles and the like.
We, GEORGE HENRY RICHMOND and JOSEPH CROWTHER,, both. of 5, Derby
Street, Moss Side, Manchester, in the County of Lancaster, Engineers, do hereby
declare the nature of this invention to be as follows:-
Our invention relates to improvements in driving mechanism for bicycles and
the like in which two internal wheels, mounted on the shaft on which the pedal
levers are fixed, gear into two pinions secured on opposite sides of the driving
wheel and in carrying our improvements into effect we mount the hub of the
driving wheel in ball bearings carried directly by the fork of the frame and we
secure upon the hub and on opposite sides two pinions which gear into two
internally toothed wheels mounted in ball bearings upon two fixed studs carried
by the frame of the cycle in line with one another and in the same horizontal
plane. The internally toothed wheels are driven by two pedal levers one on each
side of the driving wheel which receives its motion from the internal wheels by
means of the two pinions secured upon its hub.
The spokes of the wheel are carried by a drum or its equivalent contained
within the space between the internal wheels the drum being connected to the
hub of the wheel by a plate or arms, in this manner we obtain a narrower tread
than that obtained in a chain driven cycle.
"
We may apply our improved driving mechanism to either the front or rear
wheel of a bicycle or to both wheels of a bicycle intended for two riders, or to
the front wheel of a tricycle.
COMPLETE SPECIFICATION.
Improvements in Driving Mechanism for Bicycles and the like.
We, GEORGE HENRY RICHMOND and JOSEPHI CROWTHER, both of 5, Derby
Street, Moss Side, Manchester, in the County of Lancaster, Engineers, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:
Our invention relates to improvements in driving mechanism for bicycles and
the like in which two internal wheels, mounted on the shaft on which the pedal
cranks are fixed gear into two pinions secured on opposite sides of the driving
wheel and in carrying our improvements into effect we mount the hub of the
driving wheel in ball bearings carried directly by the fork of the frame and we
Price 8d.1

page_text: secure upon the hub and on opposite sides two pinions which gear into two
internally toothed wheels mounted in ball bearings upon two fixed studs carried
by the frame of the cycle in line with one another and in the same horizontal
plane. The internally toothed wheels are driven by two pedal cranks one on each
side of the driving wheel which receives its motion from the internal wheels by
means of the two pinions secured upon its hub.
The spokes of the wheel are carried by a drum or its equivalent contained
within the space between the internal wheels the drum being connected to the
hub of the wheel by a plate or arms, in this manner we obtain a narrower tread
than that obtained in a chain driven cycle.
In the accompanying sheet of drawings-
Fig. 1 is a sectional elevation of one half of our improved driving mechanism
for a bicycle, the mechanism on the opposite side of the driving wheel being
similar is not shown, and Fig. 2 is a front view of Fig. 1.
In the drawing a designates half the hub of the driving wheel which is not
shown, this hub carries a flange a¹ for the wheel spokes, the hub is mounted
loosely on the axle b, upon which is fitted also loosely a collar e provided with
two projections on its exterior which serves to key and connect the short boss
on the hub a to the boss d of a pinion loose on the axle b; in this boss is turned
a V groove to receive anti-friction balls e held in position by caps f which screw
into forks g of the frame, the parts a and d and c being held in position by a
taper nut which screws on to the axle b. We prefer to make the boss and
pinion d in a separate part from a in order that it may be hardened if required.
The forks g also carry on each side of the driving wheel a stud i upon which
is mounted on anti-friction balls j, one of the pedal cranks k upon the boss of
which is secured an internally toothed wheel the teeth of which gear into the
teeth of the pinion d, the pedal crank is held in position on the stud i by a
screw and washer m, and in order to protect the teeth from dirt a disc of metal n
is connected to the forks g by a bracket p.
The hub a of the wheel is connected to the rim, not shown, by spokes o secured
to its flange a¹.
When the pedal cranks .k are turned they carry round the internal wheels!
which give motion to the pinions d and as the bosses of the pinions are connected
to the hub a motion is conveyed to the wheel of the cycle.
We may apply our improved driving mechanism to either the front or rear
wheel of a bicycle or to both wheels of a bicycle intended for two riders, or to
the front wheel of a tricycle.
We are aware that internal wheels and pinions have been previously employed
for driving bicycles and the like, and we therefore make no claim for such
broadly.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. In a gear of the type indicated forming in the boss of the pinions a ✓ groove
to receive anti-friction balls substantially as and for the purposes described.
2. The special construction of wheel drums a with flanges a¹ for carrying the
spokes outside of the gearing whereby the width of the tread of the machine can
be materially reduced substantially as described.
Dated this 27th day of June 1808
H. B. BARLOW & GILLETT,
Agents for Applicants, 17, St. Ann's Square, Manchester.