Year: 1894

page_text: I, WILLIAM EDWARD CORRIGALL, of 27 Sterndale Road, West Kensington
Park, in the County of London, Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention has for object to provide improved constructions and arrangements
of driving mechanism for cycles.
One arrangement of driving mechanism according to this invention comprises
a chain wheel fixed upon or formed in one with the pedal shaft, an endless chain,
and toothed gearing which may be mounted around the axle of the rear wheel
of the machine and comprises a chain wheel driven by the endless chain and
provided with an internal ring of teeth that gear with one of two intermediate
pinions, having fixed axes and ball bearings and the other of which gears with
a pinion formed in one with, or secured to, one end of the hub of the driving
wheel. This hub is hollow and carried at its other end on a ball bearing
arranged between it and the adjacent portion of the fork. The hub is formed
near its toothed end with an annular projecting portion or flange, the outer face
of which, near the edge, is made to serve as a ball track and the outer periphery
of which is adapted to receive a brake band which can be actuated through
suitable means, such as a cord, from a lever on the handle bar. Fixed to the
adjacent fork is a plate having a similar ball track to that upon the hub of the
wheel and carrying inwardly projecting studs upon which are mounted the aforesaid.
pinions, one of which gears with the internally toothed chain wheel which runs
on ball bearings arranged between it and the hub and end plate respectively.
The fixed end plate has on its inner side, a central screw threaded hole in which
is screwed one end of a rod that passes through the hollow hub and the fixed
cone of the ball bearing on the opposite side of the wheel, and is provided at
its other and outer end, with a tightening nut.
With the arrangement of driving mechanism described, power can be transmitted
by an endless chain from the chain wheel on the pedal shaft to the other chain
wheel which may have even a slightly larger number of teeth than the first
mentioned one if desired, and which latter will impart through the two pinions an
increased number of revolutions, in the same direction, to the rear wheel of the
bicycle. If desired a casing for excluding dirt from the gearing may be provided,
one part of said casing being connected to the end plate and another part being
adapted to fit close to but not to touch the annular projecting portion or flange of
the hub.
For the purpose of enabling the rear wheel with its gearing to be readily shifted
to take up any slack in the chain, or for other purposes, and refixed in proper
position, those parts of the bearings of the wheel which are directly connected to
the rear fork of the machine, are formed with dove-tail projections arranged to
slide in longitudinal grooves or ways formed in or carried by the said fork, the
adjusting movement being effected by means of screws that cannot move lengthwise
and which pass through screw threaded holes in the said parts.. The forks are
graduated at the side so as to form a vernier by means of which it can be easily

page_text: ascertained when the rear wheel is in the proper position relatively to the frame
of the machine..
Dated this 27th day of September 1894.
Improvements in Driving Mechanism for Oycles.
I, WILLIAM EDWARD CORRIGALL, of 27 Sterndale Road, West Kensington
Park, in the County of London, Engineer, 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 aud by the following statement :-
This invention has for object to provide an improved construction and arrange-
ment of driving mechanism for cycles, as I shall now proceed to explain by reference
to the accompanying drawings wherein,
Figs. 1 and 2 show respectively in plan and side elevation, so much of a cycle
as is necessary to illustrate the application thereto of driving mechanism according
to this invention.
Fig. 3 is a cross section on the line
of Fig. 1, showing, to a larger scale, the
pedal shaft and driving wheel carried thereby; and
Fig. 4 is a section on the line al of Fig. 3.
Fig. 5 is a cross section on the line y y of Fig. 1, showing, to a larger scale,
the rear axle of the machine with the gearing carried thereby; and
Fig. 6 shows partly in side view and partly in vertical section, the toothed
gearing alone.
Figs. 7, 8 and 9 are detail views hereinafter referred to.
Fig. 10 is a sectional detail view showing a modified arrangement.
My improved driving mechanism comprises a chain wheel 1 fixed upon, or it
may be formed in one with the pedal shaft 2, an endless chain 3, and gearing
which is mounted around the axle of the rear wheel 4 of the machine, and
comprises a chain wheel 5 driven by the endless chain 3 and provided with an
internal ring of teeth 6 that gears with one (7) of two intermediate pinions 7, 8
having fixed axes and ball bearings 9, the other pinion (8) gearing with a
pinion 10 that is formed in one with, or may be secured to, one end of the
hub 11 of the driving wheel 4. This hub is hollow and carried at its other
end on a ball bearing 12 arranged between it and the adjacent side portion 13
of the frame of the macbiue. The hub is formed near its toothed end, with an
annular projecting portion.or flange 11ª, the outer face of which, near the edge,
is made to serve as a ball track 11, and the outer periphery of which may, as
shown at 14 in Fig. 10, be formed as a brake wheel adapted to receive a brake
band 14 that is secured by a pin 14 to the adjacent side portion 13ª of the frame
of the machine, and is adapted to be actuated through suitable means, such as a
cord 15 (Fig. 2), from a lever on the handle bar. I prefer however to adapt the
chain wheel 5 to serve also as the brake wheel, by forming it with a groove at 14
to receive the brake band 14ª, as shown in Fig. 5, as by this means. I obviate
having to bend the said adjacent side portion 13 of the frame, in the manner
shown in Fig. 10, in order to avoid undue overhang of the pin 14. 16 is a fixed
plate connected with the aforesaid portion 13ª of the frame of the machine. It is
provided with a similar ball track 16 to that (11) upon the flange 11ª of the wheel
hub 11, and carries inwardly projecting studs 17 upon which are mounted the

page_text: aforesaid pinions. 7 and 8. The internally toothed chain wheel 6 runs on ball
bearings 18 arranged between it and the ball tracks 11° and 16 on the hub 11 and
end plate 16 respectively. 19 is a rod screwed at one end into a central screw
threaded bole 16b in the end plate 16; and at the other end into the fixed cone 12ª of
the ball bearing 12 at the opposite side of the wheel. The rod 19, instead of being
screwed into the fixed cone 12, as shown, may extend through the said cone and.
be provided at its outer end with a tightening nut, but I prefer the construction
shown as being simpler and serving the same end, namely to permit of the cone
being tightened up to compensate for wear.
With the arrangement of driving mechanism described, power can be transmitted
by the endless chain 3 from the chain wheel 1 on the pedal shaft 2 to the other
chain wheel 5, which may have even a slightly larger number of teeth than the first
mentioned one if desired, and which will impart, through the two pinions 7 and 8,
an increased number of revolutions, in the same direction, to the rear wheel of the.
bicycle.
If desired, a casing 20 (Fig. 10) for excluding dirt from the toothed gearing may
be provided, the inner part of this casing being connected to the end plate 16, and
the outer part being adapted to fit close to but not to touch the annular projecting
portion or flange 11ª of the hub 11.
The driving wheel 1 may also with advantage, be enclosed in a casing 21" forming
an extension of the hollow bearing or bracket 21 in which the pedal shaft is
mounted to rotate, and which is fixed to the framo of the machine, the side 21" of
the said casing being adapted, as shown, to form a ball track at 21° for the balls 22
of the ball bearing at the corresponding end of the pedal shaft. By this con-
struction, I am enabled to carry the driving wheel at a point between the bearings
of the pedal shaft, and thus avoid having to mount the wheel on an overhanging
portion of the said shaft, as has heretofore been usual. The casing 21" is formed
with extensions 21, 21° for the passage of the endless driving chain (Fig. 2) to and
from the driving wheel 1.
The pedals 23 may conveniently be secured to the ends of the pedal shaft 2 by
forming the holes in the bosses thereof to fit correspondingly formed conical ends
of the said shaft to which each boss is fixed by a set screw 24 having a conical
head, rotary motion of the pedal, independently of the shaft, being prevented by
forming the boss of the pedal with diametrically arranged teeth or projections 23ª,
one of which is adapted to enter a recess 2" in the adjacent end of the pedal shaft,
and the other to enter one or other of a series of notches 24ª (Figs. 3, 8 & 9) in.
the endways adjustable cone 24 of the corresponding ball bearing.
It is to be understood that the mode hereinbefore described of mounting the
driving wheel 1 on the pedal shaft between the bearing thereof, and the mode of
connecting the pedals to the pedal shaft, are not herein claimed as forming part of
the present invention, as I contemplate obtaining separate Letters Patent in respect
thereof, and are merely described herein in order to show the best way known to me
of carrying out my present invention.
For the purpose of enabling the rear wheel 4 with its gearing to be readily
shifted to take up any slack in the chain, or for other purposes, and refixed in proper
position, those parts 25, 25ª of the bearings of the said wheel which are directly
connected to the rear fork or side portions 13, 13" respectively of the machine, and
in which the ball cone 12ª and a boss 16° of the plate 16 are respectively fixed, are
formed with dove-tail projections 25 arranged to slide in longitudinal grooves or
ways 26 (Figs. 5 and 7) formed in or carried by the said fork or side portious of
the machine, the adjusting movement of each part 25, 25ª being effected by means
of a sorow 27 which is prevented from moving lengthwise, and which passes
through a screw threaded hole in the corresponding part 25, 25º. These parts are
each formed with a slot 25° open at its lower end and provided with a bolt 25
whereby the boss 16° of the plate 16 and the cone 12 upon which the wheel 5
is mounted, can be readily inserted and securely fixed in the said parts 25, 25ª

page_text: and as readily removed when desired. The adjacent side. portions of the frame
of the machine are graduated or provided with scales at 28 so as to form a
vernier by means of which and pointers 29 on the said boss and cone, it can be
easily ascertained when the rear wheel is in the proper position relatively to the
frame of the machine.
Having now particularly described and ascertained the nature of the said inveu-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In driving mechanism for a cycle, the combination with a driving wheel on
the pedal shaft and an endless driving chain, of gearing driven by the said chain
and comprising a chain wheel supported at its respective sides on bearings and
provided with an internal ring of teeth, and two intermediate pinions having
fixed axes, these pinions being in gear with each other and one of them being in
gear with the ring of teeth and the other with a toothed wheel carried by one
end of the hub of the driving wheel, substantially as herein before described.
2. Constructing bearings for the rear driving wheel and its gearing. with
parts 25, 25° formed with projections arrauged to slide in longitudinal grooves or
ways 26 formed in or carried by the frame of the machine, and in connection with
which adjusting screws 27 are provided whereby the said parts 25,.25° can be
moved end ways in the said grooves or ways, substantially as hereinbefore described
with reference to and shown in Fig. 7 of the drawings annexed for the purpose
specified.
3. My improved driving mechanism for cycles, constructed; arranged and
operating substantially as berein before described with reference to and shown in
Figs. 1, 2, 5 and 6, or modified according to Fig. 10 of the drawings annexed.
Izmen
ALUMA TASHI
TIMU HIM ZR
LASH
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.