Improvements in connection with the Driving Gear of Cycles.
Year: 1899

page_text: Date of Application, 15th Aug., 1899
Complete Specification Left, 15th May, 1900-Accepted, 16th June, 1900
PROVISIONAL SPECIFICATION.
Improvements in connection with the Driving Gear of Cycles.
We, WILLIAM HENN, of 124, Ripple Road, Barking, Essex, Carpenter, and
ARTHUR GALE, of 1, Riding Cottages, Chigwell Road, South Woodford, Essex,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in connection with the driving gear
of cycles and has for its object to combine a high speed gear with a low speed
action.
For this purpose instead of fixing the ordinary sprocket wheel to the hub of
the driving wheel we mount it loosely upon a sleeve or ring fixed to the said hub.
The sprocket wheel runs in ball bearings upon the sleeve, the said bearings
being obtained by means of coned rings or surfaces formed on one side or face
of the sprocket wheel, and sleeve. The other side of the sleeve or ring projects
beyond the opposite face of the sprocket wheel and is formed with external
gear teeth, lying flush with the said face.
Outside and concentric with the toothed sleeve we provide an internally toothed
ring fixed to the fork or frame of the machine, and in the space between the said
external and internal toothed rings we fit a small toothed pinion pivoted to the
face of the sprocket wheel and gearing with each of the said rings. By this
means as the sprocket wheel is revolved by the ordinary chain gear it carries
round with it the small pinion which gearing with the fixed and loose toothed
rings causes the latter to revolve in the same direction as the sprocket wheel
but at a greater speed and this motion is communicated to the driving wheel.
By means of our invention we are enabled to use a small or low speed chain
wheel on the pedal crank axle in place of the large chain wheel hitherto in use
for high speed gears.
1000
J. B. FLEURET,
Agent for the Applicants,
5, Hatton Garden, Holborn Circus, London, E.C.
Improvements in connection with the Driving Gear of Cycles.
We, WILLIAM HENN, of 124, Ripple Road, Barking, Essex, Carpenter, and
ARTHUR GALE, of 1, Riding Cottages, Chigwell Road, South Woodford, Essex,
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 and
by the following statement:--
This invention relates to improved driving gear for cycles having for object
to combine a high speed gear with a low speed action. For this purpose instead
of fixing the ordinary sprocket wheel to the hub of the driving wheel it is

page_text: mounted loosely upon a sleeve or ring fixed to the said hub and runs upon
ball bearings formed by coned rings constituting the said sleeve.
These rings
are preferably screwed upon a portion of the hub and instead of forming the
sleeve with external gear teeth as set forth in the Provisional Specification
hereto a toothed pinion is also screwed upon the hub against the outer ring.
Outside and concentric with the said pinion is an internally toothed ring or
drum fixed to the frame of the machine or screwed on to the wheel axle, and
in the space between the said toothed ring and the pinion is fitted another pinion
gearing with the latter and the ring and mounted so as to revolve upon the
outer face of the sprocket wheel. One two or more pinions may be mounted on
the latter gearing with the ring and central pinion. By this means as the
sprocket wheel is revolved by the ordinary chain gear it carries round with it
the small pinion or pinions which gearing with the fixed toothed ring or drum
and central pinion causes the latter to revolve in the same direction as the
sprocket wheel but at a greater speed and this motion is communicated to the
driving wheel.
Thus by means of this invention a small or low speed sprocket wheel may be
fitted on the crank axle in place of the large wheel hitherto in use for high
speed gears.
And in order to clearly understand our invention reference is had to the
accompanying sheet of drawings in which Fig. 1 is a side elevation, partly in
section, of the gear applied to the hub of the driving wheel.
cross-section of the same, and Fig. 3 is a plan, partly in section.
Fig. 2 is a central
axle of the driving wheel, and b is the wheel hub revolving upon ball bearings b¹
a is the fixed
in the usual manner. e is the sprocket or chain wheel mounted on ball bearings cl
carried by a sleeve or ring formed by the two coned discs or rings d, screwed
upon the threaded portion 62 of the hub e is the central toothed pinion which is
also screwed upon the part of the hub against the outer ring d, and f is a
slightly coned ring taking into a recess in the pinion e and serving to lock the
pinion and rings to the hub, the ring f screwing on to the threaded part 6 of
the hub, the threads on the parts 62 and 6 being right-handed whilst those
on 3 are left-handed. is the internally toothed ring or drum which is screwed
to the axle a and may also be fixed to the fork or frame h of the machine.
the toothed pinion mounted on the sprocket wheel c and gearing with the teeth
of the fixed ring g and the pinion e.
on the sprocket wheel on the opposite of the pinion-e so as to gear with the latter
A similar pinion may also be mounted
and the fixed ring h. These pinions revolve on ball-bearings k the races of
which are formed by means of the coned head of the stud and the coned bush m
screwed upon the said stud. The end of the stud, which is of reduced diameter
and is formed with a screw-thread of contrary direction to that on which the
bush is screwed, passes through a hole in one of the spokes of the wheel c and is
secured to the latter by a nutín.
i is
In operation the wheel c as it is revolved by the ordinary gear chain carries
round with it the pinions and which pinions gearing with the fixed toothed
ring g and the central pinion e causes the latter to revolve in the same direction
as the wheel c but at a greater speed regulated according to the differences in
diameter of the said pinions and the fixed toothed ring, and the pinion e being
fixed to the hub of the driving wheel its motion is communicated to the latter.
It will thus be seen that by means of our invention a much larger sprocket_or
chain wheel may be applied to the hub of the driving wheel than is usual and a
small or low speed wheel to the crank axle, thus combining a high speed gear
with a low speed action.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that
what we claim is:-
(1) The improved driving gear for cycles comprising a ennockot

page_text: mounted so as to revolve upon the driving wheel hub, a pinion fixed to the said
hub, an internally toothed ring or drum fixed to the driving wheel axle or to the
frame of the machine concentrically with the said pinion, and one or more
pinions loosely mounted upon one side or face of the sprocket wheel and gearing
with the internally toothed ring or drum as well as with the pinion fixed to
the driving wheel hub, substantially as described.
(2) In driving gear for cycles the combination with the driving wheel axle a
and hub of the sprocket wheel c revolving on ball-bearings c¹ formed of coned
discs or rings d, screwed upon the part 2 of the hub, the pinion e screwed
upon the part 3 of the hub, the coned locking ring f carried in a recess of the
pinion e and screwing upon the part 6 of the hub, the internally-toothed ring or
drum g screwed to the axle a, the toothed pinions i and i carried by the wheel c
and gearing with the ring g and pinion e, and ball-bearings k for the pinions
formed by the studs 1, coned bushes m and nuts n all arranged and operating
substantially as described and shewn in the drawings for the purposes specified.
Dated t
1
J. B. FLEURET,
Agent for the Applicants,
5, Hatton Garden, Holborn Circus, London, E.C.