Improvements in Oyole and other Cranks.
Year: 1897

page_text: Date of Application, 10th Dec., 1897
Complete Specification Left, 10th Sept., 1898-Accepted, 5th Nov., 1898
Improvements in Oyole and other Cranks.
We, JOHN TATE WILLIAMSON, Engineer, 31, Alma Place, North Shields,
County Northumberland, and TOM PARKINSON, Miller, Denewell Avenue, Low
Fell, Gateshead-upon-Tyne, Durham, do hereby declare the nature of this invention
to be as follows:.
Consisting of a combination of two levers or cranks, whereby additional power or
leverage is obtained; maintaining the usual rise and fall of the pedal and
circumference performed.
In this combination of levers or cranks, one crank is similar to the present in
use, with the exception, that it is longer, and has no pedal. The power is trans-
mitted to it by an additional lever or pedal crank with a suitable driving con-
nection, such as a connecting link or other device, which will allow the said levers
or cranks freedom in their connection, to rotate in a manner peculiar to their
relative positions of centres or fulcrums which determine the additional power or
leverage in and after the following arrangement. The longer crank is attached
direct to the chain wheel spindle as at present.
The additional lever or pedal crank has its centre or fulcrum around a fixed disc
or its equivalent, in advance of, and eccentric to the ordinary crank, at any
approved distance therefrom as may be the ratio of increased power or leverage.
The disc or its equivalent is placed behind the ordinary crank and secured to
the cycle frame, and of such a size that the spindle of the ordinary crank, will be
within the circle of its diameter, to allow of the strap of the additional lever or pedal
crank which embraces the disc-to freely revolve.
Dated this 8th day of December 1897.
JOHN. TATE WILLIAMSON.
TOM PARKINSON.
JOHN
Improvements in Cycle and other Cranks.
TATE WILLIAMSON, Engineer, 31, Alma Placo, North Shields,
in the County of Northumberland, Tox PARKINSON, Miller, Denewell Avenue,
Low Fell, Gateshead-on-Tyne, Durham, 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, and description of
the drawing:
--
The dotted circle (A) will be understood to represent the pitch circle of an
ordinary sprocket wheel attached to the lever or crank (G) as at present, and
occupying its usual position and relation to the frame of a cycle.
го

page_text: The drawing represents the opposite side to the chain side, the only difference in
the gear of the two sides is, that the means of fixing the circular ring or disc (D)
to the frame, is by an extension of the bracket (B) on the centre line (C) and secured
to the frame or its equivalent at any point beyond or outside the driving chain
limits, as at (C¹ Cª³).
The drawing shews one circular ring or disc (D)) supported in position to the
frame or its equivalent at (C3 C4). The circular ring or disc (D) may be suitably
grooved on its perifhery to receive steel balls or their equivalents in conjunction
with the strap (D). The strap (D) may be attached to or part of the connecting
rod (D) which has its centre or fulcrum at (E) on the back of a sliding block (F).
The sliding block (F) is suitably shaped and prepared to contain several steel balls
or their equivalents (F) and provision is made whereby the said balls may be
adjusted by the nuts (F) in close contact with the lever or crank (G).
On the outside of the said sliding block (F) the ordinary pedal (H) is attached
in any approved manner.
The lever or crank (G) is suitably grooved for the said balls in the sliding
block on its top and bottom edge (GG) to allow of the steady travel of the
sliding block (F) and its combinations, whereby the twisting and other strains on
the pedals shall be transmitted as much as possible onto the lever or crank (G)
and not onto the connecting rod (1) of the circular ring or disc (D).
Suitable covers may be adopted for keeping dust and dirt out of the grooves of
the levers or cranks, also guards or dress protectors for the ends of the levers or
cranks when projecting beyond the sliding block during parts of a revolution.
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: :-
A compound crank gear for cycles and other crank machines, constructed and
arranged substantially as herinbefore described with reference to the drawing
annexed.
Uated this 9th don of Sentember 180g