Improvements in Differential Gearing for Velocipedes.
Year: 1892

page_text: Date of Application, 14th July, 1892
Complete Specification Left, 2nd May, 1893-Accepted, 14th July, 1893
PROVISIONAL SPECIFICATION.
Improvements in Differential Gearing for Velocipedes.
We HARRY JOHN GRAFHAM of 38 Selsdon Road Croydon Engineer and
WILLIAM FREDERICK TAYLOR Engineer Boswell Court Croydon in the County
of Surrey do hereby declare the nature of our invention to be as follows:-
:―
The object of this invention is to obtain a differential speed between the driving
and the driven wheels of velocipedes.
For this purpose we construct upon the driving spindle a disc having upon its
rim a suitable number of internal teeth gears or frictional arrangement or device.
Upon the spindle is placed a hollow spindle or bearing. Affixed to this rigidly and
excentric to its axis is a plane or cone or ball bearing the collar of which is formed
in or upon a disc to which are affixed on each side geared or friction wheels, one on
the one side having external teeth, gears or frictional bearing surfaces the other on
the other side having internal teeth or gears or frictional bearing surfaces. Upon the
hollow shaft is also a plain, cone or ball bearing upon which the driven wheel
runs. Affixed to the driven wheel or shaft is a gear wheel having external teeth
or gears or frictional surfaces and the excentricity of the ball or other bearing on
the hollow spindle or shaft is such that it brings at the same time both the internal
gear or surfaces on the driving shaft into gear or bearing with the external gear or
surfaces on the collars and the internal teeth or surfaces on the collar with the
external teeth or surfaces on the driven wheel. The hollow shaft is fixed to the
forks or brackets which form the supports of the whole arrangement. This said
arrangement of gears will increase the speed of the driven wheel should however
a slower speed thereof be required the above description will hold good substituting
the words "driven" for "driving" and "driving" for "driven."
Dated this 14th day of July 1892.
HARRY JOHN GRAFHAM.
WILLIAM FREDERICK TAYLOR.
COMPLETE SPECIFICATION.
Improvements in Differential Gearing for Velocipedes.
We, HARRY JOHN GRAFHAM of No. 38 Selsdon Road South Croydon in the
County of Surrey Cycle Mechanic and WILLIAM FREDERICK TAYLOR of
Boswell Court Croydon in the County of Surrey Consulting 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:-
The object of this invention is to obtain a differential speed between the driving
and the driven wheels or spindles of velocipedes. For this purpose we construct
upon the driving spindle a disc having for its rim a suitable number of internal
teeth or gears. Upon this spindle is placed a hollow spindle or bearing. Affixed
to this rigidly and excentric to its axis is a ball, plain, or cone hearing, upon this
runs a compound pinion formed in or upon a disc to which are affixed on each side
gear wheels, one on the one side having external teeth or gears, the other on the
other side having internal teeth or gears. Upon the hollow spindle is also a plain,
cone, or ball bearing upon which the driven wheel runs. Affixed to the driven
wheel is a gear wheel having external teeth or gears and the excentricity of the
ball or other bearing on the hollow spindle is such that it brings at the same time
both the internal teeth of the gear on the driving spindle into gear with the
Price 8d1

page_text: external teeth of the gear on the collar and the internal teeth on the collar with
the external teeth on the driven wheel. The hollow spindle is fixed to one of the
forks or brackets which form the supports of the whole arrangement. This
arrangement of gears will increase the speed of the driven wheel, should however,
a slower speed thereof be desired then the above description will hold good
substituting the words "driven" for "driving" and "driving" for "driven."
This device is peculiarly applicable to velocipedes for which differential gearing is
required and we use it for this purpose.
Referring to the accompanying drawings
:-
Fig. 1. illustrates a longitudinal section of the device, in which a represents the
driving spindle, & the disc having for its rim the internal teeth c, c, c, etc., d is the
hollow spindle or bearing, e is a ball, cone or plain bearing, e 1 its collar formed in
or upon a disc to which latter are affixed on the one side the gear wheel f1 and on
the other side the gear wheel 2 thus forming the compound pinion f. Upon the
hollow spindle d is the bearing g upon which the driven wheel / runs, i is a gear'
affixed to as and for the purposes above described. K, K, are the lower ends of
the forks or brackets which form the supports of the whole mechanism.
Figs. 2 & 3 represent two sections in end view through the gears on lines A to B
and to D respectively and in each of the three figs. the same letters indicate
corresponding parts of the mechanism.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is
In gearing for velocipedes :-
The combination of an internal gear wheel on the driving spindle a compound
pinion running upon a bearing of fixed excentricity and an external gear wheel on
the driven wheel or spindle substantially as described.
Dated this 14th day of April 1893.
HARRY JOHN GRAFHAM.
WILLIAM FREDERICK TAYLOR.