Improvements in or relating to Driving Gear for Velocipedes and the like.
Year: 1897

page_text: Date of Application, 13th Mar., 1897
Complete Specification Left, 11th Dec., 1897-Accepted, 19th Feb., 1898
PROVISIONAL SPECIFICATION.
Improvements in or relating to Driving Gear for Velocipedes and
the like.
JOSEPH HENRY MORGAN, 59, Park Road, Battersea, London, S.W., Builder's
Foreman, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in driving gear for velocipedes and the like
and consists in mounting a chain or driving wheel upon a bearing eccentrically set
This
upon a spindle on which a hub carrying the driving wheel rotates.
eccentrically set wheel gears with a slotted lever or rod through the medium of a pin
or the like carried by the chain or driving wheel and attached to or secured to the
hub or bearing carrying the wheel to be driven, for the purpose of giving increased
driving power when required, said chain wheel being driven in any of the well-known
and convenient manners such as by means of pedals or driving cranks.
E. EATON,
Agent for Applicant.
Improvements in and relating to Driving Gear for Velocipedes and
the like.
I, JOSEPH HENRY MORGAN, of 59, Park Road, Battersea, in the County of London,
Builder's Foreman, 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 improvements in driving gear for velocipedes and the
like, wherein a chain or driving wheel is carried upon a bearing, set eccentrically
upon a fixed part, such for example as the spindle upon which the hub of the driven
road wheel revolves, the said bearing being set eccentrically relatively to a shaft or
wheel to be driven. This eccentrically set driving wheel carries a slotted lever, rcd,
or equivalent means, which acts upon or against pins, carried by the axis or hub of
the driven wheel, the object of the invention being to obtain increased driving
power, the driving or pedal crank, when such is employed, or equivalent, being so
set in relation to the eccentrically set wheel or wheels that great advantage is
obtained.
In order that my invention may be readily understood, I will describe same with
reference to the accompanying drawings, whereon Fig. 1 is a side elevation, and
Fig. 2 is a vertical cross section, shewing my eccentrically mounted driving wheel;

page_text: applied to say operate the road wheel of an ordinary rear driven bicycle, the drawing
shewing one form of connection between the eccentrically mounted driven wheel,
and the road wheel. Fig. 3 is a vertical section, shewing a similar application to that
at Figs. 1 and 2, with a modified and preferred construction of the connection
between the eccentric driving wheel and the driven part, in this case the hub of the
rear road wheel. Fig. 4 is a side sectional elevation of the arrangement shewn at
Fig. 3, the eccentrically set driving wheel having been removed to shew the other
parts more clearly. Fig. 5 shews in elevation, an application of the invention to the
pedal axle of a bicycle, the construction being exactly similar to that before shewn,
but arranged to allow the action being reversed. Fig. 6 is a vertical cross section of
the arrangement shewn at Fig. 5.
According to my invention, and referring to Figs. 1 and 2, A is the rear wheel
spindle, which is held stationary between the rear fork of the machine, and upon
which spindle the hub B of the rear wheel revolves; upon this spindle I fix, by
keying or otherwise, an eccentric C to carry a chain or driving wheel D. This latter
I generally make in the form of a ring and provide balls D' and an annular ball race
as shewn at Fig. 2 between the driving wheel or ring D and the fixed eccentric C, the
latter being set as shewn so that the pull of the chain or band, acts with great
advantage, with respect to the driving of the driven road wheel.
I then provide a suitable connection between the eccentrically mounted chain
wheel D and the hub B, such as will allow of the transfer of motion directly there-
from, and to this end I provide at Figs. 1 and 2, a slotted arm E, fixed to the chain
wheel D, and upon the hub B I provide an arm F, having a pin or roller G which
engages in the slot E¹ of the arm E. By this arrangement the movement of the
chain wheel D, is transferred by the slotted arm E, roller G, and arm F, to the hub B,
and the latter is advantageously driven.
At Figs. 3 and 4, the chain wheel or ring D, and eccentric Care exactly similarly
arranged to that just described, but instead of the lever E I provide a plate Ex
similarly fixed to the wheel or ring D, and formed with a number of lever like
arm's E. These arms are carried round with the wheel D, and act against pins or
rollers G, which in this case are fixed directly to the hub B, or as shewn to a plate
or carrier B¹ attached thereto, and the number of the pins or rollers G*, I make equal
to the number of arms Ex of the plate Ex, the space between the arms being so cut
out as to allow of the passage of the said pins G*.
It will be understood that mechanism such as described at Figs. 1, 2, 3, and 4, can
be applied to any velocipede of otherwise ordinary construction, and the endless chain
passing around the ring or wheel D, can be driven by the ordinary bottom bracket
chain wheel and pedal or cranks. I however generally prefer and find it advan-
tageous to apply my invention also to the pedal driving mechanism as shewn at
Figs. 5 and 6, the construction of which is very similar to that shewn with reference
to the road wheel at Figs. 3 and 4. Referring to Figs. 5 and 6, C is the part fixed
eccentrically upon and relatively to the bottom bracket A, D is the chain wheel or
ring capable of being freely revolved on ball bearings around the eccentric C; as in
this case it is the chain wheel D which is to be driven from the pedal or crank
shaft B, I mount the laterally projecting pins or rollers G* upon the chain ring D,
and I key the armed plate Ex upon the crank axle B*. H Fig. 6 shews one of the
pedal cranks. The mechanism shewn at Figs. 5 and 6 is drawn on a somewhat reduced
scale to that of Figs. 1 to 4, but referring to Fig. 4, and Figs. 5 and 6, the relative
angles at which the eccentrics are set, are those I have found to answer the purpose,
although I do not absolutely limit myself to such. In some cases I may employ my
invention as shewn for example at Fig. 5 and 6, to drive an ordinary chain wheel
fitted on the hub of the road wheel.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I
claim is :-
1. In driving gear for velociuedes and the like, a disc mounted on a fixed part of

page_text: the machine, eccentrically to the part, such as a wheel hub required to be driven, a
wheel or ring capable of revolving upon the fixed eccentric disc, and means for
revolving same, and an intermediate connection between the eccentrically mounted
driving ring or wheel and the wheel hub to be driven, substantially as described.
2. In driving gear for velocipedes and the like, a disc mounted on a fixed part of
the machine, eccentrically to the part, such as a wheel hub required to be driven, a
wheel or ring capable of revolving upon the fixed eccentric disc, and means for
revolving same, and an intermediate connection between the eccentrically mounted
driving ring or wheel and the wheel hub to be driven, composed of a slotted arm
carried by the driving wheel or ring, a roller engaging the slot of the arm, and an arm
carrying the roller, the latter arm being fixed to the hub to be driven, substantially as
described.
3. In driving gear for velocipedes and the like, a disc mounted on a fixed part of
the machine, eccentrically to the part, such as a wheel hub to be driven, and a driving
wheel or ring capable of being revolved around and upon the eccentric disc, a plate
carried by the driving ring or wheel, and arms on the plate to engage rollers or pins
upon the hub or part to be driven or upon a disc fixed thereto, whereby the part such
as the hub is rotated, substantially as described.
3. In driving gear for velocipedes and the like, the arrangement and combination
of the mechanism, substantially as described and illustrated with reference to Figs. 5
and 6 of the accompanying drawings.
4. The general construction and arrangement of parts composing my improved
driving gear for velocipedes and the like, all combined and acting, substantially as
described and illustrated with reference to the accompanying drawings.
Dated this 11th day of December 1897.
BREWER & SON,
London and Leeds, Agents for the Applicaut.