Improvements in the Hanging of Driving Wheels of "Geared Ordinary" Cycles in combination with Special Gearing for same.
Year: 1892

page_text: Date of Application, 11th May, 1892
Complete Specification Left, 11th Feb., 1893-Accepted, 22nd Apr., 1893
PROVISIONAL SPECIFICATION.
Improvements in the Hanging of Driving Wheels of "Geared
Ordinary" Cycles in combination with Special Gearing for
same.
PETER MACLEOD BAXTER Engineering Manager to Messrs. Cox & Co.
Engineers & Shipbuilders Falmouth England, do hereby declare the nature of this
invention to be as follows:-
The first improvements consist in an arrangement which allows of lateral motion
or swing between the driving wheel and the cycle frame. An internal wheel fixed
upon the crank spindle engages with a pinion fixed upon the hollow hub of driving
wheel. The outer ends of spindle run in bearings in fork ends. The driving wheel
mounted upon its hollow hub revolves upon the outer surfaces of eccentrics
contained within the hollow hub. These eccentrics in turn are free to move upon
the crank spindle being mounted upon bearings upon it. The outer surfaces of
supporting eccentrics and pinion wheel are concentric with driving wheel hub, but
eccentric to internal wheel and crank spindle.
Another application consists of an internal wheel fixed upon the crank spindle
engaging with a pinion fixed upon the hollow hub of driving wheel.
The outer
ends of spindle run in bearings in fork ends. The driving wheel mounted upon its
hollow hub revolves upon a hollow tube fixed to the fork at side of machine
opposite to gearing. The gear side of tube may carry a bearing for the spindle to
revolve in.
The pinion and driving wheel are concentric but eccentric to crank
spindle.
Another application consists of two internally geared wheels forming the driving
cranks and revolving upon their outer surfaces in bearings upon fork ends. Two
pinions are fitted upon wheel spindle one at either end. The driving wheel is
concentric with pinions. The cranks with the internally geared wheels are eccentric
to pinion centres. The spindle bearings are also carried in the fork ends.
Another application consists of an internal wheel mounted upon crank spindle
engaging with a pinion mounted upon hollow hub. The fork ends carry the
bearings for hollow hub, and spindle at sides. The hub centre and spindle are
eccentric to each other.
Another application consists of one or more internal friction wheels mounted upon
crank spindle gearing into a pinion or pinions mounted upon hollow hub of driving
wheel. The spindle runs on bearings on fork ends. The pinions roll within the
internal wheel, no further bearing being necessary. The disc faces of pinion or
pinions may have ball bearings let into them to reduce end friction.
Another application consists of one or more internal wheels fixed upon crank
spindle engaging with a pinion or pinions mounted upon hollow hub of driving
wheel. The motion is transmitted by toothed gearing but the internal wheel or
wheels roll upon a surface of same diameter as pitch line of toothed gear. The
spindle runs on bearing on fork ends. The pinions roll within the internal wheel.
The disc faces of pinion or pinions may have ball bearings let into them to reduce
end friction.
With any of the above methods the gearing is intended to be either toothed or
frictional.
All revolving parts may be mounted upon ball bearings.
To prevent slack cranks these are preferably bored out in two elngths, to two
different diameters having their centres eccentric. The spindle and or geared

page_text: In all cases either or both the internal gear wheels or pinions may be so
mounted as to partially revolve upon their centres, the amount of revolution
being controlled by a spring, in order to reduce shocks.
The faces of the friction wheels or teeth of gear wheels may be either metal,
paper, leather, rubber or other composition.
The improvements primarily refer to that type of cycle styled "Geared
Ordinary but they are not confined to that type but would be applicable to cycles
of all kinds.
Dated this 9th day of May 1892
P. MACLEOD BAXTER.
COMPLETE SPECIFICATION.
Improvements in the Hanging of Driving Wheels of "Geared
Ordinary" Cycles in combination with Special Gearing for
same.
I, PETER MACLEOD BAXTER, of 4 Florence Place, Falmouth, in the County
of Cornwall, 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 :-
My invention relates to an improved method of mounting the driving wheels of
front-driven cycles, the object being to allow the driving wheel a slight lateral
motion or swing with respect to the frame carrying it.
I attain this end in the manner illustrated by the accompanying drawing, in
which
Figure 1 is a view in sectional elevation of the hub of the driving wheel, and its
driving mechanism.
Figure 2 is a view in transverse section on line x, x, Figure 1, and
Figure 3 is a view in transverse section on line y, y, Figure 1.
Throughout these views similar parts are marked with like letters of reference.
Upon the crank axle A, which is mounted to run in suitable bearings carried by
the ends of the prongs B, B, of the fork adapted to carry the driving wheel, is fixed
an internal spur wheel C which gears with a spur pinion D fixed to the hub E, E,
of the driving wheel. On the crank axle A are loosely mounted two eccentric
discs F, F, coupled together by suitable stays f, f,f, forming an eccentric frame,
suitable ball bearings being interposed between the said frame and the axle A.
The hub E of the driving wheel revolves on this eccentric frame F, F, suitable
ball bearings being interposed between the two parts. The eccentricity of the hub
of the wheel with respect to the crank axle is proportioned with a view to giving
the driving wheel the desired superiority in speed of rotation over the crank axle,
as the relative sizes of the internal spur wheel on the crank axle and the spur
pinion carried by the hub is determined by the said eccentricity.
It will be seen that by mounting the driving wheel on the loose eccentric
frame F, F, it allows a lateral motion or swing between the frame of the machine
and the driving wheel, which thereby relieves the machine of a considerable amount
of jarring and jolting when travelling over rough roads.
I wish it to be particularly understood that I do not limit nyself to the precise
details of construction hereinbefore described and illustrated by the accompanying
drawing, but that I hold myself at liberty to make such changes and alterations as
fairly fall within the spirit and scope of my invention.
I am aware that at the date of my invention it was not new to mount the hub of
the driving wheel eccentric with the crank axle, or to communicate motion from
the said axle to the hub of the driving wheel by means of an internal spur wheel
and a spur pinion, and I do not therefore claim such broadly, but

page_text: 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 improved method of mounting the driving wheels of geared front-driven
oycles, substantially as hereinbefore described and illustrated by the accompanying
drawing.
2. In a cycle having a front driving wheel adapted to be driven by a crank axle
passing through its hub, at a speed of rotation superior to that of the said crank
axle, mounting the hub of the driving wheel to rotate on a frame eccentrically and
loosely mounted on the crank axle, as and for the purpose set forth.
3. In a cycle, the combination of the crank axle A mounted loosely in bearings
carried by the fork B, B; of the internal spur wheel C fixed to the crank axle A;
of the eccentric frame F, F, mounted loosely on the crank axle; of the hub of the
driving wheel E mounted loosely on the eccentric frame; and of the spur pinion D
mounted on or carried by the hub of the driving wheel, all combined, arranged, and
operating as and for the purpose set forth.
Dated this 11th day of February 1893.
ROBT. ED. PHILLIPS, M.I.M.E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.