IMPROVEMENTS IN DRIVING GEAR FOR VELOCIPEDES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We, THOMAS MILLWARD of N° 3 Mardale Street, Goldhawk Road,
Shepherd's Bush in the County of Middlesex, Engineer, and CHARLES LENI
of N° 129 Hammersmith Road in the County of Middlesex, Machinist, do hereby
declare the nature of our said invention for "IMPROVEMENTS IN DRIVING GEAR
FOR VELOCIPEDES " to be as follows:
The object of this our Invention is to produce a Driving Gear applicable to all
Velocipedes which from its extreme simplicity shall be thoroughly effective and at
the same time be manufactured at considerably less cost than any other hitherto
introduced.
By our Invention we minimise friction and reduce the weight of the driving
gear and the machine generally.
In order to describe our Invention reference is made to a driving gear known in
the trade as the "Crypto" which has an internally toothed wheel and an externally
toothed wheel in the centre and four pinions connected with the chain wheel
gearing around it. The central wheel is used as a fulcrum by which in locking it
to the frame power is obtained and by locking it to the chain wheel speed is
obtained.
. Our improved gearing consists of a pinion wheel keyed on the driving shaft and
two pinions working on studs on the chain wheel and gearing with pinion on the
driving shaft, held in position to rotate round the driving wheel by a cam. By
the aid of a sliding clutch the cam may be locked either to the chain wheel or
spindle to obtain speed and by releasing it from the chain wheel and locking it to
the frame or other suitable part we obtain power.
In relative proportion to the sizes of the driving pinion and pinions driven we
vary the power to any extent.
Dated this 22nd day of January 1884.

page_text: We, THOMAS MILLWARD of N° 3 Mardale Street, Goldhawk Road,
Shepherds Bush in the County of Middlesex, Engineer and CHARLES LENI of
N° 129 Hammersmith Road in the County of Middlesex, Machinist, do hereby
declare the nature of our said Invention for "IMPROVEMENTS IN DRIVING GEAR
FOR VELOCIPEDES" and in what manner the same is to be performed to be
particularly described and ascertained in and by the following statement, reference
being had to the accompanying drawings and to the letters of reference marked
thereon, that is to say:
The Object of this our Invention is to produce a driving gear applicable to all.
Velocipedes which from its extreme simplicity shall be thoroughly effective and
at the same time be manufactured at considerably less cost than any other
hitherto introduced.'
This Invention may be briefly called the "Eccentric Speed and Power Gear."
By our Invention we minimise friction and reduce the weight of the driving gear
and the machine generally.
In order to describe our Invention reference is made to a driving gear known in
the trade as the "Crypto" which has an internally toothed wheel and an externally
toothed wheel in the centre and four pinions connected with the chain wheel,
gearing round it The central wheel is used as a fulcrum by which in locking it
to the frame power is obtained and' by locking it to the chain wheel speed is
obtained.
Our improved gearing consists of a pinion wheel keyed on the driving shaft and
two pinions working on studs on the chain wheel and gearing with pinion on
driving shaft, held in position to rotate round the driving pinion by a cam. By
the aid of a sliding clutch the cam may be locked either to the chain wheel or
spindle to obtain speed and by releasing it from the chain wheel and locking it to
the frame or other suitable part we obtain power.
In relative proportion to the sizes of the driving pinion and pinions driven we
vary the power to any extent.
1
And in order that this our Invention may be fully understood reference is had
to the accompanying drawings and to the letters of reference marked thereon.
Figure 1 is a full sized illustration of chain wheel in elevation shewing driven
and driving pinions in position.
'
Figure 2 represents a back view of cam also full size with eccentric ring in
position in dotted lines.
Figure 3 is a perspective view of chain wheel and pinions on a reduced scale.
Figure 4 is front view of cam and Eccentric ring, also on a reduced scale.
Figure 5 is a full sized section of gearing in position and
Figure 6 is a full sized external view of gearing.
The same letters of reference refer to similar parts throughout all the figures.
A is the axle of the machine; running loose upon it is the chain wheel B. On the
face of chain wheel B are fixed two studs C upon which work the two pinions D
which gear into the driving pinion E which is keyed fast on axle A. Fixed solid
on the face of pinions D are plates or cranks F at ends of which are studs upon
which a ring G is fitted which works on the eccentric cam H which is loose on
Axle A. Up against the cam H is a collar K and sliding upon this collar K is the
clutch I.
By sliding the clutch I along and locking it into cam H. the whole forms part
and parcel of the chain wheel and revolves together and speed is obtained and
by releasing the clutch I from the cam and locking it to frame of machine the

page_text: cam is held fast from rotating, the pinions D are driven round at a decreased
rate in proportion to the number of teeth in driving and driven pinions and power
is obtained.
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:
The Combination and arrangement of pinions and Eccentric as and for the
purposes herein set forth and described.