Improvements in or relating to Driving Gear, particularly applicable to Cycles and other Vehicles.
Year: 1897

page_text: Date of Application, 30th Jan., 1897-Accepted, 3rd Apr., 1897
COMPLETE SPECIFICATION.
Improvements in or relating to Driving Gear, particularly applicable
to Cycles and other Vehicles.
We, PAGANINI LÉON ADOLPHE PIOLA, and PIERRE MARIUS GAYON, Engineers of
115 Rue du Chateau Paris, in the Republic of France, 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 relates to improvements in driving gear and is particularly applicable
to cycles or other vehicles without altering their construction and without necessitating
modifications of any existing parts.
The idea of increasing the speed of cycles or, increasing the effect of the revolution
of the pedals by means of inner or outer toothed wheels is not new, and our invention
consists in a special arrangement of parts for producing a speed gear, especially
applicable to cycles.
In the accompanying drawing
Fig. 1 is a view of the device according to the present invention, in elevation.
Fig. 2 is a horizontal section of said device on the line 1-2 of Fig. 1.
Fig. 3 is a sectional elevation of the device viewed from the side opposite to that
shown in Fig. 1 and taken on the line 3-4 of Fig. 2.
Fig. 4 is a partial section on line 5-6 of Fig. 1.
The device comprises a toothed pinion a which is driven by the driving chain of the
machine. The pinion a is internally provided with teeth i engaging with a pinion k
secured on the hub m of the driving wheel, and said pinion a rotates upon balls al on
a disc c provided with a peripheral groove for said balls which are held in place by a
cup & secured to the pinion a.
This cup d is provided with several screw-threaded holes d' arranged on one and
the same circumference, that is at equal distances from the centre or periphery, and
on the pinion a are made corresponding conical holes or cells a² with any one of which
the end of a screw n screwed into one of the holes d' of the cup d may engage.
By this means the cup d having been tightened as desired can be suitably held in
place by placing the screw n in the hole d¹ which corresponds to one of the holes a²,
the end of said screw engaging with the latter thus securing the cup d to the
pinion a.
The pinion is preferably made of tempered steel and is hollowed out or cup shaped
so as to enable it to be used as a cup for the balls k¹ rolling on a cone o mounted on
the spindle g of the driving wheel. This cone o is keyed to and carries the disc c and
is provided with a screw-threaded portion which serves to receive a nut p holding said
cone on the disc.
This disc c must not turn and it is held by a holder or plate h which engages with
the forks end of the chain adjusting device, and through which passes the usual
screw of said device. The end of this plate engages with a hole in the disc c thus
preventing it from rotating.
The plate instead of being placed on the same side of the axle as the frame tube e
is placed on the opposite side whereby the length of the fork end fis considerably
reduced.
The working of the apparatus is as follows:-
The driving chain rotates the minion a which drives by means of its teeth. i the

page_text: pinion and through it the driving wheel. The pinion a rolls on balls a' on the fixed
disc e and the pinion k forming a cup, rolls on balls on the cone o.
The increase of speed of rotation for each revolution of the pedal or other driving
device depends upon the relative number of the teeth of the pinions a and k respectively
as in other similar devices.
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;—
'
1. In a speed driving gear the combination of an internally and externally toothed
pinion receiving its motion through its external teeth from a driving chain with a
toothed pinion secured to the hub of the machine and adapted to rotate on balls on a
fixed disc on the axle of the driving wheel and secured to the machine by a plate
fixed on the framing of the machine substantially as described.
2. In a speed driving gear of the character described the device for fixing the disc c
consisting of a holder / mounted on the forked end of the chain adjusting device
and traversed by the screw r of said device and engaging with a hole in the disc c
substantially as described.
3. In the speed driving gear of the character described a pinion as a revolving on
balls on a fixed disc as e said balls being held by a cup adjustably secured to the
pinion which is provided with several screw threaded holes as d' with one of which
engages a screw n entering into one of the holes a² of the pinion a so as to adjustably
secure together the cup and the pinion substantially as described.
4. The combination and arrangements of parts forming a complete speed driving
gear for cycles and the like substantially as described and illustrated in the
accompanying drawings.
Dated this 20th
. L
1007
BOULT & WADE,
Agents for the Applicants.