Improvements in or connected with Driving Mechanism for Velocipedes and other Vehicles.
Year: 1896

page_text: Date of Application, 30th Mar., 1896
Complete Specification Left, 30th Dec., 1896-Accepted, 27th Mar., 1897
PROVISIONAL SPECIFICATION.
Improvements in or connected with Driving Mechanism for
Velocipedes and other Vehicles.
We, THOMAS HANN. Mechanical Engineer, WILLIAM BROMLEY, Wine and
Spirit Merchant's Traveller, JOHN PRICE, Mechanical Engineer, all of 18 Upper
Kennington Lane, ALFRED HENRY SMITH, Gentleman, of 89 Marney Road,
Clapham Common, and DICK EDWARDS RADCLYFFE, Gentleman, of 56 Gloucester
Crescent, Regent's Park, all in the County of London, do hereby declare the nature
of this invention to be as follows:-
This invention for improvements in, or connected with driving mechanism for
velocipedes and other vehicles, especially refers to the application of a cylindrical
cam or cams and connections therefrom to the road wheel or wheels to be driven.
According to our invention we form, say, a groove, around the circular surface
of a cylinder, the groove being such that upon the revolution of the cylinder, it
will rock a pivotted lever or arm a number of times during one revolution,
according to the form given to the cam groove.
Such a cylindrical cam we mount axially upon a shaft carried in suitable
bearings, and in its application to a bicycle, to which we refer by way of example,
the cam is mounted upon a pedal axle, by which the said cam is revolved.
Located within the cam groove (or against the cam surface) is a bowl or roller
carried by one arm of a two-armed lever, fulcrummed on the framework of the
machine, and the other arm of the lever is or may be jointed to, and operates a
connecting rod, which latter takes on to a crank on the driven wheel axle.
By these means the driven wheel is revolved once, twice, or more times during
one revolution of the crank axle, according to the number of throws formed upon
the cam.
The cylinder may be formed with double cam grooves and be adapted to operate
a lever for each connecting rod, or one cam groove may be caused to operate two
levers suitably bent or arranged. In some cases the cam may operate a rocking
bar, the opposite ends of which act upon connecting rods.
Such mechanism as that before described is particularly applicable to bicycles,
tricycles, and other velocipedes, or to other vehicles whether the cylinder be driven
by steam, gas, electric or other power, or by the feet of a rider or riders.
Dated this 30th day of March 1896.
BREWER & SON,
London aud Leeds, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or connected with Driving Mechanism for
Velocipedes and other Vehioles.
We, THOMAS HANN, Mechanical Engineer, WILLIAM BROMLEY, Wine and
Spirit Merchant's Traveller, JOHN PRICE, Mechanical Engineer, all of 18 Upper
Kennington Lane, ALFRED HENRY SMITH, Gentleman, of 89 Marney Road,
Clapham Common, and DICK EDWARDS RADCLYFFE Gentleman of 56 Gloucester

page_text: Crescent, Regent's Park, all in the County of London, do hereby declare the
nature of this invention and iu what manner the same is to be performed to be
particularly described and ascertained in and by the following statement :-
This invention for improvements in, or connected with, driving mechanism for
velocipedes and other vehicles, especially refers to the application of a cylindrical
cam, or cams, and connections therefrom, to the road wheel or other wheels to be
driven.
According to our invention we form, say, a groove, around the circular surface
of a cylinder, the groove being such, that upon the revolution of the cylinder, it
will rock a pivotted lever, or arm, a number of times during one revolution,
according to the form given to the cam groove.
In order that our invention may be readily understood, we will describe same
with reference to the accompanying drawings, whereon
Fig. 1 shews in plan so much of driving mechanism, constructed according to
our invention, as is necessary to explain same. Fig. 2 is a similar view of au
application of a double cam-grooved cylinder.
Fig. 3 is a side elevation and Fig. 4 is a transverse section of a detail of
construction hereafter described..
A is the cylinder, around the circular surface of which we form a cam groove B,
calculated to give, during a revolution of the cylinder, any required number of
reciprocations to a pivotted arm C, which latter is provided with a bowl projecting
into the cam groove B, while the arm C is fulcrummed at C', on a bearing carried
upon the framework of the machine. Formed or connected with the arm C, are
rocking arms or levers D D, the opposite ends of which are provided with
connecting rods E E, extending to cranks F F, upon the shaft, wheel, or part G
to be driven.
In an application to a bicycle, of rear driven safety type, and as indicated in
the plan view Fig. 1, H H are the pedal cranks, H¹ the crank axle upon which
the cylinder A is fixed, and J J are the crank axle bearings, carried by any
suitable bracket, (not shewn in the drawings), from the framework of the
machine.
By these means the driven wheel or part G, is revolved once, twice, or more
times during one revolution of the cylinder A according to the formation of the
cam B thereon.
The cylinder may be formed with double cam grooves, and be adapted to operate
a lever for each connecting rod, or one cam groove may be caused to operate two
levers suitably bent and arranged. At Fig. 2 is shewn an example of a cylinder A
having double cam grooves B B'; each groove B B¹ operates by a bowl thereon
a lever arm C, fulcrummed at C, and each in connection or formed with, an
arm D, and having a connecting rod E, to the crank F to be driven. In this
arrangement the cam grooves can be readily formed in proper relative position, to
enable the cranks F to be set at any required angles, those shewn being arranged
with one 90° in advance of the other.
In some cases where double cams or cam grooves are employed the cylinder may
be divided and have one cam groove upon each part, both parts being fixed upon
the shaft in proper or required relative positions to each other, and also instead of
the cam being grooved the cam surface may project if so desired, and the bowls or
bowl be acted upon by the lateral surface or surfaces.
It should be understood, that although the means F F whereby the part G is
rotated through the action of the connecting rods, are herein before termed cranks,
and are so shewn, yet any equivalent means may be employed for the cranks F,
such as excentrics, say an excentric mounted on the shaft or hub G, and a strap
(taking onto same), carried by the connecting rod E.
Where desired or required suitable means should be provided, to allow for the
angular motion of the connecting rods, and such means may be employed as is
shown at Figs. 3 & 4, where F is the crank, F the crauk pin (or excentric as the

page_text: case may be), E is the connecting rod, formed or fitted with an annular end E',
having two diametrically opposite internal trunnions E', which take into, and rock
upon, a collar or strap F2, within which is the crank pin F1 (or excentric), ball
bearings being generally provided as shewn; the lateral motions of the connecting
rods E E, are thus taken by the trunnions E2.
Such mechanism as before described is particularly applicable to bicycles,
tricycles, and other velocipedes or to other vehicles, whether the cylinder A be
driven by steam, gas, electric, or other power, or by the feet of a rider or riders.
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. In driving mechanism for velocipedes and other vehicles, a cylinder axially
mounted upon the driving shaft, having upon or in its circular surface a cam or
cam groove adapted to give a reciprocation, or a number of reciprocations, at each
revolution to a pivotted arm or lever, and connections therefrom such as rocking
arms and connecting rods to cranks or excentrics upon the shaft, wheel, or part to
be driven, substantially as and for the purposes described.
2. In driving mechanism for velocipedes and other vehicles, a cylinder axially
mounted upon the driving shaft, having upon or in its circular surface a pair of
cams or cam grooves each adapted to give a reciprocation, or a number of recipro-
cations, to pivotted arms or levers, and connections therefrom to cranks or
excentrics upon the shaft, wheel, or part to be driven, and whereby the latter is
revolved through the revolution of the cam cylinder, substantially as described.
3. In driving mechanism for velocipedes and other vehicles, the cylindrical cam
driving mechanisin, arranged, and acting, substantially as described, with reference
to Figs. 1 and 2 of the accompanying drawings.
4. The general construction and combination of parts, composing our improve-
ments in and connected with cam driving mechanism all arranged and acting,
substantially as and for the purposes described and illustrated with reference to the
accompanying drawings.
Dated the 30th December 1806