An Improvement in Driving Gear for Road Motor Carriages.
Year: 1896

page_text: Date of Application, 5th Mar., 1896
Complete Specification Left, 3rd Dec., 1896-Accepted, 5th Mar., 1897
PROVISIONAL SPECIFICATION.
An Improvement in Driving Gear for Road Motor Carriages.
I, HENRY PERCY HOLT, of No. 22 Chancery Lane, in the County of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to simple means of driving a road motor carriage, which
I effect as follows. I make the road wheels with strong pneumatic tyres, against
which I press suitably shaped rollers which may he of wood or other material
presenting a more or less frictional surface. I cause these rollers to revolve either
directly or through suitable gear from the motor, and they by frictional contact
with the elastic tyre cause the road wheels to revolve.
The two road wheels of a pair may be thus driven either separately or together
from two motors or one.
In order to accommodate the frictional pressure to the power in the case of
a steam motor, I mount the driving roller in sliding bearings pressed on by a piston
or plunger subject to the pressure of the steam which works the engine. Sometimes
it is convenient to use at times only one of two motor engines, in order to simplify
the disengagement of one of these, the bearings of the friction roller may be
subject to springs pressing it away from the tyre of the road wheel, when the steam
has not sufficient pressure to overcome the springs and press it on the tyre.
Instead of using fluid pressure to press the driving roller against the tyre, it may
be so mounted that the more driving force it exerts the more it is pressed against
the tyre.
Deted thin 5th day of Manch 1000
ABEL & IMRAY,
Agents for the Applicant.
An Improvement in Driving Gear for Road Motor Carriages.
I, HENRY PERCY HOLT, of No. 22 Chancery Lane, in the County of London,
Engineer, 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:-
My invention relates to simple means of driving a road motor carriage which
I effect as I shall describe referring to the accompanying drawings.
Figure 1 is a side view, Figure 2 is a plan and Figure 3 is an end view of so
much of a motor carriage as is required to illustrate my invention.
Figure 4 is a side view and Figure 5 is a sectional plan shewing a modification.
Referring first to Figures 1, 2 and 3, I make the driving wheel with a strong
pneumatic tyre A against which I press suitably shaped rollers B, which may be
of wood or other material presenting a more or less frictional surface. I cause the
rollers B to revolve either directly or through suitable gear from the motor; as

page_text: shewn, the rollers B are driven by gear from the intermediate motor shaft at C, the
motor engine and gearing being all enclosed within a casing D the front of which
is suspended by a sliding block F from one of the tubes E belonging to the
framing of the carriage. The hinder part of the casing D has projecting from its
side a stud G engaged in the eye of a plunger which works in a cylinder H carried
by a bracket I clamped on the tube E. From a valve box J fluid under pressure
can, when desired, be admitted to the cylinder H forcing its plunger with the
stud G and the casing D backwards, thus pressing the rollers B against the tyre A,
so that they cause the road wheel to revolve. The two road wheels of a pair may
be thus driven separately from two motors, one on each side of the carriage, or a
single motor might obviously be arranged with suitable gearing to drive a pair of
rollers such as B B on each side of the carriage, suitable means being provided for
pressing them against the tyres A of the two road wheels.
When steam or compressed air is used as the working Heid of the motor engine
or engines, the same valve box J is conveniently used for the supply of the engine
as well as for that of the pressure cylinder H, and springs may be arranged to
press the casing D forwards, so that, when the supply to the engine is cut off by
the valve in J, the rollers B are pressed by the springs out of contact with the
tyre A.
As shewn in Figures 4 and 5, the rollers for driving the tyre A are made
themselves with pneumatic tyres B₁ B₁ which press against A more or less, the
more or less they are inflated. By means of a sliding piston valve k, compressed
air may be admitted through the tubular valve stem to inflate the tyres B' B' when
they have to drive A, or the air may be allowed to escape so that the tyres B¹ B
become deflated and cease to drive A..
The rollers B B are driven from the motor shaft C through intermediate
wheels K K.
The shaft C may also carry a pneumatically tyred wheel B which may be
inflated to drive A when the wheels B' B¹ are deflated, and conversely. By this
arrangement the speed may be altered, the wheels Bi B', while acting together,
driving say at half the speed at which A would be driven by B acting alone.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim is.
Driving gear for the wheel of a road motor carriage consisting of suitably shaped
rollers driven by the motor engine and pressed against the pneumatic tyre of the
road wheel, substantially as described.
Dated this 3rd day of December 1896.
ABEL & IMRAY,
Agents for the Applicant.