Improvements in Driving Gear for Cycles.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in Driving Gear for Cycles.
I, GEORGE KING, of 23, Ardmillan Terrace, Edinburgh, in the County of Mid-
Lothian, N.B., Engineman, do hereby declare the nature of this invention to be
as follows:-
1
This invention relates to improvements in driving gear for cycles and relates to
that class of machine which is driven by chain and sprocket wheel on the rear or
driving wheel and has for its object to obtain increased speed. In lieu of the
chain or sprocket wheel being keyed upon the crank axle, it revolves loosely
thereon, the driving of the chain wheel being effected through the intervention of
gearing. The said gearing consists of a toothed wheel which is mounted on the
same pin as carries the pedal, the said toothed wheel being at the other or inside
of the crank that is to say the pedal pin passes right through the end of the crank,
the said toothed wheel being mounted upon that part of the pedal pin which
protrudes through the crank on the inner side thereof. This toothed wheel gears
with a corresponding toothed wheel which is keyed upon a hollow spindle through
which the crank spindle passes. Upon the same hollow spindle is keyed the
ordinary chain wheel. Upon pressing down the pedal, in the ordinary way, the
toothed wheel which is carried by the pedal pin on the inside of the crank, gives
a motion of rotation to the toothed wheel which is keyed upon the hollow spindle
through which the crank spindle passes and the chain wheel being keyed upon
the same hollow spindle, motion is given to the said chain wheel in the ordinary
way except that on accordance with my invention it is done through the medium
of the said gearing.
The toothed wheel which is mounted upon the pedal pin does not revolve in the
same manner as the other toothed wheel but describes a sun and planet motion around
the circumference of the other toothed wheel. If the two toothed wheels are of the
same size it follows that one motion of the pedal toothed wheel around the
periphery of the crank axle toothed wheel gives to the latter toothed wheel two
revolutions.
The said pedal pin toothed wheel is allowed to describe its sun and planet
motion, without revolving in the same way as the other toothed wheel, by means
of double jointed levers fixed to any convenient part of the cycle framing that is
to say I may pivot a guiding rod to the back stay of the cycle. The end of this
rod may hang down approximately parallel with the ordinary or nearly upright
tube which supports the saddle. Another rod is jointed to the said lower end of
the first rod and the other end of the second rod is connected to the pin upon which
the pedal toothed wheel is mounted. The arrangement is such that whilst the
said jointed levers prevent the pedal toothed wheel from revolving on its axis,
they allow it to describe the sun and planet motion around the periphery of the
other toothed wheel.
T: 00th dose of Tul., 1907

page_text: Improvements in Driving Gear for Cycles.
I, GEORGE KING, of 23, Ardmillan Terrace, Edinburgh, in the County of Mid-
Lothian, N.B., Engineman, do hereby declare the nature of this invention, and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention relates to improvements in driving gear for cycles and relates
more especially to that class of machine which is driven by chain and sprocket
wheel on the rear or driving wheel but is also applicable to what are known as
chainless geared cycles and has for its object to obtain increased speed. In lieu
of the sprocket wheel being keyed upon the crank axle, it revolves loosely thereon,
the driving of the chain wheel being effected through the intervention of gearing.
But in order that my said invention may be more readily understood and easily
carried into effect I will proceed to describe the same with reference to the accom-
panying drawings in which Fig. 1 is a side view and Fig. 2 a rear view of a
portion of a cycle fitted with one form of my improved gear.
Figs. 3 and 4 are similar views of a modified form of the gear showing the parts
in their relative positions but detached from the cycle.
Figs. 5 and 6 are side and rear views respectively of a portion of a cycle shewing
a further modified form of the gearing and
Fig. 7 is a rear view of a portion of a cycle shewing a still further modification.
Referring to Figs. 1 and 2 of the said drawings A is the usual chain driving
wheel which I key to a hollow spindle a mounted in the bearing B of the cycle
frame and which is provided at the other side with a spur or toothed wheel C also
keyed thereon; the chain and toothed wheel thus revolving together. Through
the said hollow spindle a is passed the crank axle I) having the usual cranks d
keyed upon it and in order to enable the cranks when rotated to communicate
their motion to the chain wheel, through the toothed wheel C, I extend the pedal
pin E inwardly at e and key a toothed wheel F thereon to engage with the wheel C.
The pedal pin passes loosely through the end of the crank and together with the
wheel F is prevented from rotating by means of the double jointed levers or
rods G, G¹, fixed to any convenient part of the cycle framing; the rod G hangs
down approximately parallel with the ordinary or nearly upright tube which
supports the saddle and the rod G which is hinged thereto at 9, is connected to a
square neck upon the pedal pin or formed in one therewith. The wheel F is
thus prevented from revolving on its axis but is allowed to describe a sun and
planet motion around the periphery of the toothed wheel.
If the two toothed wheels are of the same size it follows that one motion of the
pedal toothed wheel around the periphery of the crank axle toothed wheel gives
to the latter toothed wheel two revolutions.
As a modification I may, as shewn in Figs. 3 and 4, mount the toothed wheel F
upon the crank towards the centre thereof and connect the wheel to the pedal
pin by means of the sprocket wheels H and chain h, the crank in this case being
made in two portions capable of being extended so as to take up the slack in the
chain.
Or in place of the sprocket wheels and chain I may mount two other toothed
wheels, similar to the toothed wheel F loosely upon the crank so as to gear there-
with. In both of these forms the pedal pin and wheel which is keyed thereto are
prevented from revolving by hinged rods such as first described or by a rod J
sliding within a hollow sleeve j pivoted upon the cycle framing, as shewn.
As a further modification I may as shewn in Figs. 5 and 6, dispense with the

page_text: chain and chain wheels altogether and key the cycle wheel directly upon the
hollow spindle, the toothed wheels C and F being arranged and operated in a
similar manner to that described with regard to Figs. 1 and 2.
Also as shewn in Fig. 7, as a still further modification, I may key the toothed
wheel C directly to the axle K upon which the cycle wheel L is keyed and mount
a chain wheel k of the usual form loosely thereon, the said chain wheel & having
a crank or arm k¹ formed therewith or secured to it so that both revolve together.
The end of the spindle M, to which the toothed wheel F is keyed, works loosely in
the end of the said arm or crank and is prevented from revolving on its axis as
before. With this form the motion is communicated to the toothed wheel C by
the chain wheel k through the medium of the usual driving sprocket wheel and
chain operated by the cranks in the ordinary way.
With the various forms of gear just described a very considerable increase in
speed is obtained which may be varied as described by substituting different
sized wheels upon the crank which may be made with adjustable bearings to allow
for this. In the case of tandem cycles the rod which prevents the toothed wheels
from revolving may extend from the front pedal pin to the rear pedal pin instead
of being connected to the framing.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
1. The general arrangement construction and combination of parts constituting
my improvements in driving gear for cycles, comprising a toothed or other wheel
upon the driving chain wheel axle, or the axle of the driving wheel, a toothed or
other wheel upon the crank engaging therewith and a jointed, hinged or telescopic
rod or rods extending between the framing of the cycle and the spindle of the
wheel upon the crank, all arranged and operating substantially in the manner as
hereinbefore described and shewn in the accompanying drawings.
2. In driving gear for cycles, the method of mounting the toothed or other
wheel upon the crank of the cycle, consisting in extending the pedal pin E
inwardly and keying the wheel thereon; the said pin and wheel being prevented
from revolving on their axes by the jointed or hinged rods G G¹ or by the
telescopic rod and sleeve J j, secured to the framing and the pedal pin, whereby
the wheel revolves in a sun and planetary motion around the toothed wheel upon
the crank axle or upon the axle of the cycle wheel, substantially as herein before
described and shewn in the accompanying drawings.
TM
DO
JOHNSONS,
Applicant's Agents, 115, St. Vincent Street, Glasgow.
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