Improved Cam Driving Mechanism for Cycles and other Machines.
Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c., Act, 1883) as required by
the decision of the Comptroller General of the 4th day of April 1898.
Date of Application, 14th Dec., 1896
Complete Specification Loft 11th Sant 1007 Accented
6th Nov
1907
PROVISIONAL SPECIFICATION.
Improved Cam Driving Mechanism for Cycles and other Machines.
I, THOMAS FERNELEY WILEY, of 47, Elmfield Road, Upper Tooting, London,
S.W., Gentleman, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the driving mechanism of cycles,
particularly rear driving safety bicycles, and its object is to provide a simple
arrangement for increasing the speed of the driving wheel in relation to the
pedals.
For this purpose I form a crank journal in one of the cranks and I mount one
end of a connecting rod upon this journal. The other end of this connecting rod
may extend to a position approximately vertically over the driving axle of the
driving wheel and be supported in an S shaped or of figure 8 shaped cam groove
arranged in such a way that when the rod is reciprocated by the pedal shaft in
either direction its other end is raised up and brought down by the said cam.
This up and down movement is conveyed to a driving crank upon the driving
wheel by a second connecting rod to drive the cycle.
The stud or its equivalent on the connecting rod riding in the cam groove is
preferably fitted with an anti-friction roller which may be mounted upon ball
bearings.
When an S shaped cam is employed the said anti-friction roller travels back-
wards and forwards from end to end. When however, an 8 shaped or double
S shaped cam is employed the said roller travels in one direction by a different
path to which it travels in the other; and in this case when the two paths cross
each other in the same plane gates or switch pieces may be provided adapted to
keep the roller in the proper groove.
If desired a cam may be employed adapted to impart more than one up and
down movement to the second connecting rod at each movement in either direction
of the first connecting rod in order to obtain an increased speed.
The said cam may be located in any other suitable position instead of over the
driving axle.
The improvements may be employed for other purposes.
In any case two pairs of connecting rods working in conjunction with the same
or separate cams may be employed.
Dated this 12th day of December 1896.
DRACUP & NOWELL,
Bradford, Patent Agents.

page_text: Improved Cam Driving Mechanism for Cycles and other Machines.
I, THOMAS FERNELEY WILEY, of 47, Elmfield Road,. Upper Tooting, London,
S.E., Gentleman, 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 the driving mechanism for cycles
particularly rear driving safety bicycles, and its object is to provide a simple
arrangement for increasing the speed of the driving wheel in relation to the
pedals.
To fully describe my invention reference is made to the accompanying sheet of
drawings forming a part of this specification, in which similar letters of reference
indicate corresponding parts in each of the figures.
Figure 1, represents a side view of the rear portion of a cycle with my improved
driving mechanism applied to it.
Figure 2, represents a plan view of the same.
Figures 3 and 4, are views of detail hereinafter referred to.
The frame A and rear wheel B are of any ordinary construction excepting that
the axle C is rigidly fixed to the wheel hub and projects sufficiently beyond the
frame to have the cranks D) and D2 secured on the ends. These cranks are fixed at
90 degrees, that is to say: at right angles to each other.
The pedal cranks E and E2 have bearing necks F formed in them and are bent to
the form shown so as to place the necks at an angle of 135 degrees to each other
and at the same time leave the pedals in the usual position, that is to say:
diametrically opposite each other. Connecting rods G and G2 are mounted on the
necks and their other ends are coupled by the pins H and H2 to the connecting
rods J and J2 respectively mounted on the cranks D and D2. On the projecting
inner ends of the pins H and H2 anti-friction rollers K and K2 are mounted.
If the wheel B and crank axle L are put into motion and the wheel be driven
at exactly twice the speed of the crank axle L the anti-friction roller K will
describe a definite path which will be repeated at each revolution of the axle.
The cam groove N formed in the box cam O is made to conform to this path and
the anti-friction roller K lies in this groove. The cam O is fixed to the frame A
and a similar cam 02 is preferably fixed at the back of having a cam groove Na
conforming to the path described by the roller K2 when the wheel B and axle L
are rotated as above described. The roller K lies in the groove N2 and to prevent
the rollers K and K2 leaving the cam grooves over hanging lips P are secured to
the face of the cam as shown in the drawings and on a larger scale in Figures 3
and 4 in which a portion of the said lips are shown in position.
It will be evident from the above that if the axle L is rotated the rollers K
and Ka will be moved along the cam grooves N and N and consequently a
reciprocating motion will be imparted to the rods J and Ja which in turn drive
the wheel through the medium of the cranks D and D. The arrows in Figure 1
show the direction in which the rollers move in the cam.
To prevent the anti-friction rollers moving in the wrong direction where the
grooves cross, switch pieces R, R, R and R may be provided at the four corners
formed by the crossing of the groove, as shown in Figure 3 which represents this
portion of the cam on a larger scale and Figure 4, a sectional view of the same on
the broken line a, b Figure 3.
The switches are let into the face of the cam and are fixed on pins S passing

page_text: through the cam and having wheels T fixed on their rear ends by which they are
all geared together. The motion of the switches is limited in extent by the
sides W of the recess in which they lie. When the roller crosses the groove it
automatically moves the switches so as to from a guide across the groove.
It is evident that the position and shape of the cam may be varied and
modified.
Cams may be employed to drive the driving wheel and axle L at the ratio of
three to one or at an equal speed.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I am aware that
mechanism is already in use for transmitting rotary motion from one shaft or axle
to another by means of rotating cams and I make no claim. for such mechanism,
but I declare that what I claim is:-
1. The cam driving mechanism herein shown and described.
2. The improvements in safety bicycles, substantially as herein shown and
described.
3. The combination with the cam of the guide switches, substantially as herein
shown and described.
Doted thie 13th day of September 1897
DRACUP & NOWELL,
Bradford, Patent Agents.