Year: 1896

page_text: I, CHAIMSONOVITZ PROSPER ELIESON, of Broad Street Avenue, in the City
of London, Electrical Engineer, do hereby declare the nature of. this invention to
be as follows:-
My invention relates to driving mechanism chiefly designed for use upon road
carriages of the kind known as auto-cars and to that class of such mechanism
wherein a chain or belt is employed for effecting the transmission.
It is well known when a self-propelled road carriage is moving out of the
straight line one of the driven travelling wheels moves faster or slower than the
Whilst the chain is the most simple medium for transmitting the motion
of the motor shaft to the driving axle it has the defect that unless special com-
pensating gear is provided a greatly increased strain is thrown upon the gearing
owing to the slip which must take place between the travelling wheels and the
ground. Belt gearing tends to minimize this difficulty owing to the slip which
takes place between the belt and the driving pulleys, still its use is practically
inadmissible owing to the fact that, the driving motor running at a relatively high
speed compared with the travelling wheel axle, the pulley on the driving shaft is
much smaller than that on the driven shaft so that owing to the differences in the
areas of the pulleys with which the belt is in contact the slip takes place on the
pulley of the motor shaft rather than on the pulley on the travelling axle.
Now the object of my invention is to obtain all the advantages of belt transmission
as regards the provision for slipping with the advantages of chain transmission in
so far as regards non slipping upon the motor shaft. To effect this end I make
use of a combined belt and chain transmitter, that is to say, of a belt having a
chain fixed to it and moving therewith. The pulley on the motor shaft is provided
with teeth adapted to engage with the chain whilst the pulley on the driven shaft
or travelling axle is plain. With this arrangement it will be understood that no
slip can take place between the pulley on the motor shaft and the belt whilst the
belt is free to slip upon the pulley of the travelling axle.
In practice I find it advantageous to insert the chain in the centre of the belt,
the teeth engaging with the chain being placed in the centre of the pulley on the
motor shaft whilst a corresponding recess is formed in the centre of the pulley on
the travelling wheel axle to afford space for the chain to run without coming into
contact with the pulley.

page_text: Improvements in Driving Mechanism for Road Carriages.
I, CHAIMSONOVITZ PROSPER ELIESON, of Broad Street Avenue, in the City
of London, Electrical Engineer, do hereby declare the nature of my invention
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
My invention relates to driving mechanism chiefly designed for use upon road
carriages of the kind known as auto-cars and to that class of such mechanism
. wherein a chain or belt is employed for effecting the transmission of the driving
. power.
It is well known that when a self-propelled road carriage is moving out of the
straight line one of the driven travelling wheels moves faster or slower than the
other. Whilst the chain is the most simple medium for transmitting the motion of
the motor shaft to the driving axle it has the defect that unless special compensating
gear is provided a greatly increased strain is thrown upon the gearing owing to the
slip which must take place between the travelling wheels and the ground. Belt
gearing tends to minimize this difficulty owing to the slip which takes place
between the belt und the driving pulley, still its use is practically inadmissible
owing to the fact that, the driving motor running at a relatively high speed
compared with the travelling wheel axle, the pulley on the driving shaft is much
smaller than that on the driven shaft so that by reason of the differences in the
areas of the pulleys with which the belt is in contact the slip takes place on the
pulley of the notor shaft rather than on the pulley on the travelling axle.
Now the object of my invention is to obtain all the advantages of belt
transmission as regards the provision for slipping with the advantages of chain
transmission in so far as regards non slipping upou the motor shaft. To effect this
end I make use of a combined belt and chain transmitter, that is to say, of a belt
having a chain fixed to it and moving therewith. The pulley on the motor shaft is
provided with teeth adapted to engage with the chain whilst the pulley on the
driven shaft or travelling axle is plain. With this arrangement it will be
understood that no slip can take place between the pulley on the motor shaft and
the belt whilst the belt is free to slip upon the pulley of the travelling axle.
In practice I find it advantageous to insert the chain in the centre of the belt,
the teeth engaging with the chain being placed in the centre of the pulley on the
motor shaft whilst a corresponding recess is formed in the centre of the pulley on
the travelling wheel axle to afford space for the chain to run without coming into
contact with the pulley.
To enable my invention to be fully understood I will describe the same by
reference to the accompanying drawing, in which:
Figure 1 is a side elevation illustrating the arrangement of driving mechanism
in accordance with my invention :
Figure 2 is a plan-view of the driven wheel or pulley:
Figure 3 is an elevation of a piece of the driving chain and belt drawn to a
larger scale than Figure 1:
Figure 4 is a plan of the said piece of driving chain and belt:
Figure 5 is a section on the line 5-5 Figure 1 drawn to an enlarged scale; and,
Figure 6 is a section on the line 6-6 Figure 1 drawn to the same scale.
Similar letters of reference indicate corresponding parts in the several figures.
a is the sprocket pinion on the driving shaft and b is the belt wheel or pulley on
the driven shaft. c is the driving chain which runs around the pulley 6 and is in
engagement with the teeth of the sprocket pinion a so that the said chain is
positively driven. d, d are pins projecting from the sides of the chain the said

page_text: pins being of a length approximately corresponding with the width of the driven
pulley. As shewn in Figures 1 to 6 these pins carry leather bands or belts e, e the
said bands being secured to the pins by any suitable means in such a manner that
they will run in contact with the surface of the wheel b. As shewn, the said bands
are secured to the pins by means of small sockets f,f into which the pins are
inserted and which are secured to the said bands by rivets. In order to keep the
bands e, e taut upon the pulley, the sprocket wheel a is made wide enough to allow
of the said band running around the same in a manner which is clearly shewn in
Figure 5. Or loose pulleys may be used for the purpose.
With the arrangement hereinbefore described it will be obvious that the motion
of the driving shaft will be communicated through the sprocket wheel a to the
combined chain and belt without any liability of the latter slipping thereon, whilst
as the pulley b is plain, that is to say, unprovided with sprocket teeth it will be
obvious that the power which is transmitted from the driving pinion through the
chain will be received by the driven wheel through the band which is free to slip
upon the surface of the said driven wheel. As shewn in the drawing the driven
wheel is recessed on the periphery at that part adjacent to which the chain c runs
as indicated at g in Figures 2 and 6, it is to be understood, however, that such
recessing is not essential.
In order to retain my transmitter at the required tension I sometimes combine
therewith a loose sprocket wheel such as that indicated at Figure 1 which is
adapted to be moved at will towards or away from the transmitter to give the latter
more or less grip upon the pulley as required.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what
I claim is:-
1. In driving mechanism of the kind wherein motion is transmitted from one
shaft to another through the medium of pulleys and a belt or chain, forming the
said belt or chain so that it shall be in positive connection with the driving pulley
and in frictional connection with the driven pulley, substantially as, and for the
purpose, described.
2. In driving mechanism, the combination of a sprocket wheel on the driving
shaft, a plain pulley on the driven shaft and a transmitter consisting of a chain
with which the sprocket teeth on the driving shaft engage and having fixed at its
lateral edges surfaces which frictionally engage with the surface of the driven
wheel, substantially as described.
3. In driving mechanism of the kind herein before described a transmitter
composed of a sprocket chain having bands of leather or the like secured to its
lateral edges, substantially as described.
G. F. REDFERN & Co.,
4, South Street, Finsbury, London, Agents for the Applicant.