Year: 1897

page_text: I, WILLIAM WEBSTER ROBERTSON, Gentleman, of 30, Shore Road, Anstruther,
Fife, do hereby declare the nature of this invention to be as follows:-
This invention relates to an improved gearing for cycles and has for its object to
provide a simple means whereby the gear may be increased without having to
recourse to a large sprocket wheel on the pedal spindle.
In carrying out my invention I provide a sprocket wheel mounted on the same
spindle as the pedal crauks over which a chain passes to a smaller sprocket wheel
fixed to another spindle a short distance away from and parallel to the first mentioned
spindle.
These spindles are carried by the frame the usual ball bearings being employed
and to the second spindle is fixed the ordinary sprocket wheel which gears by means
of a chain and with the small sprocket wheel on the hub of the rear or driving
wheel of the cycle.
The frame of the machine is slightly altered so as to more conveniently carry
the two spindles and the head is preferably inclined inore so as to admit of the
two sets of wheels.
Thus it will be easy to gear up to any required extent without having a large
sprocket wheel on the pedal spindle which is unsightly in appearance.
Tinted this oth do
1007
GEO. H. RAYNER,
37, Chancery Lane, London, Agent for the Applicant.
I, WILLIAM WEBSTER ROBERTSON, Gentleman, of 30, Shore Road, Anstruther,
Fife, 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 an improved gearing for cycles and has for its object to
provide a simple means whereby the gear may be increased without having to
recourse to a large sprocket wheel on the pedal spindle.
In carrying out my invention I provide a sprocket wheel mounted on the same
spindle as the pedal cranks over which a chain passes to a smaller sprocket wheel
fixed to another spindle a short distance away from and parallel to the first mentioned
spindle.

page_text: These spindles are carried by the frame the usual ball bearings being employed
and to the second spindle is fixed the ordinary sprocket wheel which gears by
means of a chain and with the small sprocket wheel on the hub of the rear or
driving wheel of the cycle.
In order to more clearly describe this invention reference is had to the
accompanying drawing in which
Fig. 1 is an elevation of part of a bicycle constructed according to this
invention and
Fig. 2 is a plan of the same.
The spindle a is supported in the bottom bracket b of the bicycle and is provided
with pedal cranks c in the usual manner. Upon this spindle a a sprocket wheel d
is mounted. A bracket is formed on the frame and supports a spindle f upon
which a somewhat smaller sprocket wheel g. A chain passes round the wheels d
and g.
Upon the spindle f another and larger sprocket wheel is also mounted and upon
the spindle
of the back wheel of the bicycle a fourth and smaller sprocket
wheel is mounted, the wheels i and being connected by means of the
chain m.
It will be seen that by this arrangement the gearing between the pedal axle is
effected in two stages and higher gears can be employed without having a large
sprocket wheel on the pedal spindle which is unsightly in appearance.
f
Ball bearings are provided for the brackets supporting the spindles a
and j.
The frame of the machine is slightly altered so as to more conveniently carry
the two spindles and the head is preferably inclined more so as to admit of the
two sets of wheels.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is :-
(1) An improved gearing for cycles in which an intermediate shaft is employed
driven by means of a chain and sprocket wheels from the pedal axle, and further
connected by a chain and sprocket wheels to the driving wheel of the cycle, so that
the gearing is effected in two stages substantially as described and for the purposes
specified.
(2) An improved gearing for cycles comprising sprocket wheel d, chain h,
sprocket wheel g, spindle f, sprocket wheel i, chain m and sprocket wheel all
arranged substantially as described with reference to the drawings and for the
purposes specified.
1000