Improved Driving Mechanism for Velocipedes.
Year: 1893

page_text: Date of Application, 16th Aug., 1893
Complete Specification Left, 16th May, 1894-Accepted, 30th June, 1894
PROVISIONAL SPECIFICATION.
Improved Driving Mechanism for Velocipedes.
THOMAS HANN of 68 Brewery Road Plumstead, Kent, Mechanical Engineer,
and WILLIAM BROMLEY of 202 Balaam Street, Plaistow, Essex Wine and Spirit
Merchant's Traveller, do hereby declare the nature of this invention to be as
follows:-
The object of our invention is an Improved Driving Mechanism for Velocipedes,
consisting of a combination of cam-discs and cranks, linked together with con-
necting rods, or by a combination of rocking levers, connecting rods, and cranks,
thus abolishing the use of tooth gearing, chains, or the like.
1st. Mounted upon the crank axle of the machine (in lieu of the usual chain
wheel) is a cam-disc, or twin cam-discs, containing one, two, or more, throws,
according to the height of gear required, and are provided with adjustable ball
rollers, which are held in their positions by small swinging levers, or other suitable
device that will serve to guide them in the course of action required. From the said
rollers are carried two connecting rods to the hub or axle of the driving wheel or
wheels, which is provided with twin cranks having the throws on the quarter centre.
For the purpose of obviating dead centres each throw cut in the before-mentioned
cam-discs means one revolution to the driving wheel; thus a machine fitted with a
cam-disc having three throws cut in it gives the driving wheel three revolutions to
one, that of the crank axle.
2nd. Twin cranks are mounted upon the crank axle of the machine and also upon
the axle or hub of the driving wheel or wheels, having the throws at quarter-
centres in order to obviate dead centres whilst at a suitable position between the
two said points, viz.; the crank axle and the hub of the driving wheel are two
rocking levers made to oscilate upon studs or other suitable device secured to the
frame of the machine; each of the said rocking levers are provided with two
connecting rods, one at each end, the one being coupled onto, and driven by, one of
the twin cranks on the crank axle, whilst the other is coupled on to one of the
twin cranks at the hub of the driving wheel. In this case the driving wheel
receives two revolutions to one, that of the pedal crank axle.
Dated this 14th day of August 1893.
THOMAS HANN.
WILLIAM BROMLEY.
COMPLETE SPECIFICATION.
Improved Driving Mechanism for Velocipedes.
THOMAS HANN 68 Brewery Road, Plumstead, Kent Mechanical Engineer, and
WILLIAM BROMLEY 202 Balaam Street, Plaistow, Essex, Wine Merchant's
Traveller 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 :-

page_text: A represents the usual frame of machine, B represents the bracket which carry
the rocking levers C, and C¹. The rocking lever C, is provided with a long axle,
which passes through the bracket B, and extends to the opposite side of the
machine where it is mounted with an extra lever C³, both of which oscilate
together.
The before mentioned rocking levers C, and C' are provided with ball rollers D, D
which are allowed to travel in the groove E provided in the three throw cam-
disc F, for the purpose of giving motion to the rocking levers C, and C¹.
Secured to and rotating with the axle of driving wheel hub G, are two cranks H, H
one at each end, and arranged at quarter centres for the purpose of obviating dead
centres, each of the cranks H, H are driven by a connecting rod I, I, one at each
side of the machine and connected at the other ends to the rocking levers C,
and C².
In order to further explain this invention, we may add that the cam-disc F, is
firmly secured to the pedal crank axle and rotates with the same, giving the required
motion to the rocking levers C, and C¹, by means of the rollers D, D and transmits
the motion to the connecting rods I, I which drive the cranks H, H at the driving
wheel hub G, which receives three revolutions to one that of the cam-disc on the
pedal crank axle, because it contains three throws; thus we are enabled to dispense
with the usual chain or tooth gearing.
In lieu of the beforementioned rocking levers, suitable blocks may be employed,
'made to slide along the bottom stays of the frame of machine, and to carry and
guide the end of the connecting rods I. I. (which in this case carry the before-
mentioned rollers D. D.) in the course of action required; or guidebars, or any
other suitable device may be employed that will act as a guide to the connecting
rods I. I. and the rollers D. D.
In cases where the pedal cranks are direct at the driving wheel hub as in front
drivers, the beforementioned connecting rods I. I. may be entirely dispensed with,
as the cranks H. H. may be made to run in, or directly at the cam-disc or
.cam-discs.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is,
1. A combination of cam-disc or cam-discs containing any number of throws
with connecting rods and cranks as and for the purpose substantially described and
illustrated.
2. A combination of cam-disc or cam-discs containing a series of throws, and
in any style, with connecting rods and cranks, the connecting rods to be guided in
their movements by means of rocking levers, guide bars, slides, or the like, as and
for the purpose substantially described and illustrated.
3. A combination of can-disc or cam-discs containing a series of throws, and in
any style, with cranks, and with, or without, connecting rods, as and for the purpose
substantially described and illustrated.
Dated this 16th day of May 1804
THOMAS HANN.
WILLIAM BROMLEY.