Improvements in Driving Gear of Gas Motor Locomotives.
Year: 1893

page_text: Date of Application, 2nd Dec., 1893
Complete Specification Left, 3rd Aug.. 1894-Accepted. 8th Sept., 1994
PROVISIONAL SPECIFICATION.
[Communicated from abroad by AUGUST PRAWATKE, of 53, Bergstrasse, Dresden,
Saxony, Engineer.]
Improvements in Driving Gear of Gas Motor Locomotives.
1, HENRY PERCY HOLT, of 22 Chancery Lane, in the County of London,
Engineer, do hereby declare the nature of this invention to be as follows:-
When a gas motor engine is employed to drive a car, it is desirable to have ready
means of alterating the speed of the car axles without correspondingly altering the
speed of the engine.
The gear for working the driving axles must also be so arranged as to allow for
vertical oscillation of the car on its springs.
This invention relates to gear suitable to be used for such purposes.
following is a general description thereof.
The
Loose on the engine shaft (which always revolves in one direction) or on a
countershaft driven therefrom are two toothed wheels of different diameters, gearing
with corresponding wheels on a parallel countershaft. Each of the wheels on the
first mentioned shaft is situated between two circularly grooved friction discs which
rotate with the shaft and has on its sides circular ridges corresponding to the
grooves of such discs.
The outer disc in each case is fixed on the shaft, but the other disc is free to
slide along the shaft although made to revolve with it.
Between the two inner discs there is fitted on the shaft, to revolve with it, a
sliding sleeve which can be moved by the driver to either hand.
From this sleeve extend each way links connecting it to arms on bell crank
levers pivotted on bosses fixed on the shaft adjacent to the two inner discs.
When
the sleeve is in the middle position neither of the wheels is pressed between its inner
and outer discs and each wheel is thus left free, the shaft revolving without
driving it and consequently the engine in this condition does not drive the car.
According as the sleeve is moved to the one hand or the other, the levers of the
one or the other set are turned so as to clamp the one or the other wheel between
the two grooved discs, and this wheel, being now driven by the engine, drives the
car at the corresponding speed, whilst, when the other wheel is clamped by sliding
the sleeve to the other hand, the engine drives the car at the other speed. In a
convenient part of the driving gear there is interposed a ratchet wheel and pawl
allowing the car to outrun the engine, as, for instance, when it descends a gradient.
The parallel countershaft, driven above described, may be in the form of a sleeve
having within it a shaft engaged to it through bevil reversing gear.
This inuer shaft has cranks linked by side rods to cranks on the car wheels, so
that the countershafts and gear are free to oscillate vertically on the car springs.
When, instead of employing cranks and side rods, toothed gear is used to drive one
of the car axles an intermediate wheel may be interposed between the driving wheel
and the wheel on the axle the axis of this intermediate wheel being journailed in
radius rods working on the driving and the driven axles so that it always remains
in gear with both wheels, notwithstanding vertical oscillations of the driving
wheel.

page_text: It will be evident that without departing from the above invention other
equivalent arrangements may be made whereby the same can be carried out in
practice.
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1009
ABEL & IMRAY,
Agents for the Applicant.
Improvements in Driving Gear of Gas Motor Locomotives.
I, HENRY PERCY HOLT, of 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:―
When a gas motor engine is employed to drive a car, it is desirable to have ready
means of altering the speed of the car axles without correspondingly altering the
speed of the engine.
The gear for working the driving axles must also be so arranged as to allow for
vertical oscillation of the car on its springs.
This invention relates to gear suitable to be used for such purposes, as I shall
describe referring to the accompanying drawings.
Fig. 1 is a longitudinal section and Fig. 2 is a plan of a shaft arranged according
to this invention for driving at two different speeds or for stopping the vehicle
while the motor engine continues to revolve at or about constant speed.
A countershaft A driven from the motor engine through a toothed wheel X and
ratchet wheel Y acted on by a pawl Z has fixed on it two circularly grooved discs F
and G', and has fitted to slide on sleeves K K upon it provided with keys so as to
turn with it, two other grooved discs G and F', and also a sleeve H. Between the
discs F and G is a toothed wheel B loose on the shaft A but having fixed to its
sides discs D and E grooved in correspondence with the discs F and G.
In like manner between the discs F and G¹ is a toothed wheel B¹ of less diameter
than B also loose on the shaft A but having fixed to its sides grooved discs D'
and E.
The sliding sleeve H which can be moved to and fro along the shaft A by a
suitable lever is connected by links L to arms M upon the spindles of eccentrics N
the straps of which are connected by links O to the sliding discs G and F¹
respectively.
When the sleeve H is in the position shewn the wheel B' with its discs D' E' is
pressed between the discs F' and G' and is frictionally driven by them, and from
this wheel motion is transmitted to the driving wheels of the vehicle by any
convenient gearing, the wheel B being in this case ineffective, as it turns freely on
the shaft A.
When the sleeve H is moved to the left to a middle position, both the wheels B¹
and B are free, so that while A. continues to revolve, no motion is communicated to
the wheels of the vehicle. But when the sleeve H is moved fully over to the left
the wheel B becomes frictionally engaged with the shaft A and motion at increased
speed is communicated to the wheels of the vehicle.
Should the vehicle tend to run faster than it would be driven by the gearing
above described, the ratchet and pawl Y Z permit it to do so. Instead of employing
grooved discs as above described, flat faced discs may be used as shewn in Fig. 3,
with discs P P of wood or other suitable material interposed between each pair.
The shaft A without the wheel X and the ratchet and pawl Y Z may be the
engine shaft itself, the ratchet and pawl being arranged in any suitable part of the
gearing.

page_text: The parallel countershaft driven from the wheel B or B₁ may be in the form of
a sleeve having within it a shaft engaged to it through bevil or other reversing
gear.
This inner shaft has cranks linked by side rods to cranks on the car wheels, so
that the countershafts and gear are free to oscillate vertically on the car springs.
When, instead of employing cranks and side rods, toothed gear is used to drive
one of the car axles or a shaft working the axles by chain or other gear, an inter-
mediate wheel may be interposed between the driving wheel and the wheel on the
axle, the axis of this intermediate wheel being journalled in radius rods working
on the driving and the driven axles so that always remains in gear with both
wheels, notwithstanding vertical oscillations of the driving wheel.
It will be evident that without departing from the above invention other
equivalent arrangements may be made whereby the same can be carried out in
practice.
1, of course include under the term gas motor, all motors working by internal
combustion of combustible gas or vapour.
Instead of the toothed wheels B and B chain wheels may be used to drive the
car as shewn diagrammatically in Fig. 4.
In this case is the motor shaft driving by toothed gear the shaft A which
as shewn in Figs. 1, 2 and 3 is provided with the clutch gear. On this shaft A
I provide two equal chain wheels either of which can be clutched as above
described.
One of the wheels on A is connected by a chain to a wheel R on the axle S of
one pair of the wheels W of the car. The other chain wheel on A is connected bý
a chain to a wheel R' on the axle S' of the other pair of car wheels W.
The wheels R and R' being of different diameter, the speed of the car is made
less or greater according as the wheel which drives R or the wheel which drives R¹
is clutched to the shaft A.
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 :-
1. In driving gear of gas or oil motor locomotives, the arrangement of shaft with
two wheels of different diameters and friction clutches for the same, substantially
as and for the purpose herein set forth.
2. In combination with a shaft and clutches such as is above referred to and a
pair of equal chain wheels substituted for the unequal toothed wheels thereon, two
unequal chain wheels on the two car axles, each connected to one of the said
equal chain wheels, constituting gear for driving the car at two different speeds,
substantially as described.
Dated this 3rd day of August 1894.
ABEL & IMRAY,
Agents for the Applicant.