New or Improved Gear for Transmitting Rotatory Motion."
Year: 1897

page_text: Date of Application, 13th Jan., 1897
Complete Specification Left, 13th Oct., 1897-Accepted, 24th Dec., 1897
PROVISIONAL SPECIFICATION.
"New or Improved Gear for Transmitting Rotatory Motion."
We, WILLIAM GIBSON NICHOLSON, Cabinet Maker, of 14 Thomas Street, and
FRANCIS JOHN BOWER HUNTSMAN, Colliery Agent, of 81 Victoria Street, both of
Grimsby, in the County of Lincoln, do hereby declare the nature of the said inven-
tion to be as follows:-
The new or improved driving gear which forms the subject of this invention is
more particularly applicable for use in cycles, but with suitable modifications may
also be applied for driving other similar vehicles, motor-cars, and the like, and
other machinery.
In applying our invention to a bicycle, for example, we mount an eccentric on
the crank spindle, and connect the strap of the said eccentric, by means of a con-
necting rod, to a crank mounted on and revolving with the axle of the driving
road wheel. This axle has also keyed or otherwise attached thereto an internally-
toothed wheel into which gears a spur wheel placed eccentrically to the driving
wheel axle, and mounted loosely on the boss of a plate which is suitably held by
bolts or otherwise to a fixed part of the machine. The said spur wheel is also
provided with internal teeth which gear with a second spur wheel which is fixed
to the hub of the driving wheel in any convenient manner, the said driving wheel
rotating loosely on its axle.
It will be understood that when the crank spindle is caused to rotate by the
pedalling of the rider the before-mentioned eccentric, by its strap and connecting
rod, will communicate rotatory motion to the crank on the axfe of the driving
road wheel. Motion is thus imparted to the internal gear wheel which is keyed
on the said axle, and thence to the spur wheel running eccentrically to the road
wheel axle. The internal teeth of this last named spur wheel at the same time
imparts motion to the beforementioned spur wheel mounted on the hub of the
driving wheel.
The eccentric strap and other bearing surfaces are preferably supplied with ball
bearings. Part of or the entire gear may be repeated on the other side of the
machine as may be required.
The above described arrangement enables us to entirely dispense with driving
chains, and permits a machine to be geared to any convenient speed, the gearing
being arranged in a very compact manner.
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page_text: "New or Improved Gear for Transmitting Rotatory Motion.”
We, WILLIAM GIBSON NICHOLSON, Cabinet Maker, of 14 Thomas Street, and
FRANCIS JOHN BOWER HUNTSMAN, Colliery Agent, of 81 Victoria Street, both of
Grimsby, in the County of Lincoln, do hereby declare the nature of this inven-
tion, and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
The new or improved driving gear which forms the subject of this invention is
more particularly applicable for use in cycles, but with suitable modifications may
also be applied for driving other similar vehicles, motor-cars, and the like, and
other machinery.
In applying our invention to a bicycle, for example, we mount an eccentric on
the crank spindle, and connect the strap of the said eccentric, by means of a con-
necting rod, to a crank mounted on and revolving with the axle of the driving
road-wheel. This axle has also keyed or otherwise attached thereto an internally-
toothed wheel into which gears a spur wheel placed eccentrically to the driving
wheel axle, and mounted loosely on the boss of a plate which is suitably held by
bolts or otherwise to a fixed part of the machine. The said spur wheel is also
provided with internal teeth which gear with a second spur wheel which is fixed
to the hub of the driving wheel in any convenient manner, the said driving wheel
rotating loosely on its axle.
Figure 1 of the accompanying Drawings illustrates diagrammatically a portion
of a bicycle with our improvements applied thereto. Figure 2 is a sectional eleva-
tion as seen from the inner side of the gear casing. Figure 3 is a section on
line X-X of Figure 2.
Similar letters relate to like parts in all of the Figures of the Drawings.
A is the driving road-wheel of a bicycle mounted loosely on its spindle A. Bis
the crank spindle running in suitable bearings in the frame of the bicycle, and
having fixed thereto the usual crank-arm B₁ carrying the pedal B². C is an
eccentric also fixed on the crank spindle 13 and communicating motion by its
strap C¹ and connecting-rod D to the crank arm A fixed on the spindle A¹ of
. the driving road wheel A. E is an internally toothed wheel which is fixed on the
spindle A and gears into the spur wheel which is placed eccentrically to the
wheel E and rotates loosely in the ball bearings F in the boss of a plate G which
is supported by the bolts G fixed to the gear box or casing H which is attached to
the frame A3 of the bicycle by the fixing H¹, or in any other convenient manner.
The wheel gears by means of its internal teeth with the wheel I fixed on the
hub A of the road driving wheel A.
"It will be understood that when the crank spindle B is caused to rotate by the
pedalling of the rider the eccentric C by its strap C¹ and connecting-rod D will
cominunicate rotatory motion to the crank A² on the spindle A¹ of the driving
road-wheel A. Motion is thus imparted to the wheel E which is fixed on the
spindle A, and thence by the. internal teeth of the wheel E to the external teeth of
the wheel F which runs eccentrically to the spindle A¹. The internal teeth of the
wheel F communicate motion to the wheel I which being fixed to the hub A
causes the driving road-wheel A to rotate on its spindle A¹ at a speed propor-
tionate to the ratio of the gearing.
The eccentric strap C and other bearing surfaces are preferably supplied with
ball bearings. Part of or the entire gear may be repeated on the other side of the
machine as may be required.
The above described arrangement enables us to dispense entirely with driving

page_text: chains, and permits a machine to be geared to any convenient speed, the gearing
being arranged in a very compact manner.
In some cases we so arrange the eccentric C (Figure 1) that instead of the
pedal spindle B being completely rotated it may be partly rotated, only the
pedal B being moved up and down to such an extent as will impart the necessary
rotatory motion to the spindle A¹ of the driving road-wheel A.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, we declare that what
we claim is :-
First. The new or improved driving gear which consists of a toothed wheel fixed
on the wheel to be driven, and a toothed wheel fixed on the spindle of the wheel
to be driven, the two wheels being geared together with an intermediate toothed
wheel turning on a fixed bearing, motion being imparted to the said gearing by
means of one or more eccentrics or cranks mounted on a driving spindle and
eccentric straps and rods and a crank or cranks on the spindle of the wheel to be
driven, substantially as described.
Second. Driving gear constructed and operating substantially as described.