IMPROVEMENTS IN ROAD LOCOMOTIVE AND SIMILAR ENGINES
Year: 1878

page_text: LETTERS PATENT to Thomas Aveling, of Rochester, in the County of Kent,
and David Greig, of the Steam Plough Works, Leeds, in the County of York,
for the Invention of IMPROVEMENTS IN ROAD LOCOMOTIVE AND SIMILAR
ENGINES."
PROVISIONAL SPECIFICATION left by the said Thomas Aveling and David
Greig at the Office of the Commissioners of Patents on the 13th November
1878.
THOMAS AVELING, of Rochester, in the County of Kent, and DAVID GREIG, of
"IMPROVEMENTS IN
the Steam Plough Works, Leeds, in the County of York.
ROAD LOCOMOTIVE AND SIMILAR ENGINES."
This Invention has for its object improvements in road locomotive and similar
engines. Engines which are locomotive on common roads, as traction engines.
agricultural engines, and the like, have to be provided with gear of two speeds for
transmitting the rotary motion of the crank shaft of the engine to the road wheels.
A Patent was granted to one of us, namely, to me, Thomas Aveling, dated the
15th day of January in the present year, No. 197, for an arrangement for this
purpose, of which the main feature is that the gear is disposed within the width of
the boiler and between the horn plates in place of arranging such gear or the
greater portion thereof between the boiler and the road wheel, as had been the
practice theretofore.
Another feature of the said arrangement is that two countershafts are interposed
between the crank axis of the engine and the axis of the road wheels which admits
of a better proportioning of the gear wheels and pinions than is possible when
there is but one countershaft.
According to our present Invention we retain both these features of the arrange-
ment protected by the said former Patent, and we arrange the train in the following
manner: We fix upon the crank shaft of the engine two pinions of different sizes,

page_text: and we have a sleeve sliding upon the first countershaft with groove and feather.
The sleeve has two spur wheels fixed upon it, either of which by the sliding of the
sleeve can be brought to gear with its appropriate pinion upon the crank shaft.
The above mentioned wheels and pinions are over the boiler of the engine between
the horn plates.
Between the side of the engine and the road wheel we provide a pinion on the
first countershaft taking into a spur wheel upon the second countershaft, which also
carries another pinion engaging with a spur wheel which is concentric with the
axis of the road wheels, which axis and wheels it drives through the ordinary
differential arrangement, admitting of the road wheels on opposite sides of the
engine being driven at different speeds. The wheel and pinion on the second
countershaft may be either on the same or on opposite sides of the engine.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Thomas Aveling and David Greig in the Great Seal Patent Office
on the 13th May 1879.
THOMAS AVELING, of Rochester, in the County of Kent, and DAVID GREIG, of
the Steam Plough Works, Leeds, in the County of York. "IMPROVEMENTS IN
ROAD LOCOMOTIVE AND SIMILAR ENGINES."
This Invention has for its object improvements in road locomotive and similar
engines. Engines which are locomotive on common roads, as traction engines,
agricultural engines, and the like, have to be provided with gear of two speeds
for transmitting the rotary motion of the crank shaft of the engine to the road
wheels.
A Patent was granted to one of us, namely, to me, Thomas Aveling, dated the
15th day of January in the present year, No. 197, for an arrangement for this
purpose, of which the main feature is that the gear is disposed within the width of
the boiler and between the horn plates in place of arranging such gear or the
greater portion thereof between the boiler and the road wheel, as had been the
practice theretofore.
Another feature of the said arrangement is that two countershafts are interposed
between the crank axis of the engine and the axis of the road wheels which admits
of a better proportioning of the gear wheels and pinions than is possible when there
is but one countershaft.
According to our present Invention we retain both these features of the arrange-
ment protected by the said former Patent, and we arrange the train in the following
manner; We fix upon the crank shaft of the engine two pinions of different sizes,
and we have a sleeve sliding upon the first countershaft with groove and feather.
The sleeve has two spur wheels fixed upon it, either of which by the sliding of the
sleeve can be brought to gear with its appropriate pinion upon the crank shaft.
The above mentioned wheels and pinions are over the boiler of the engine between'
the horn plate and the brackets.
Between the side of the engine and the road wheel we provide a pinion on the
first countershaft taking into a spur wheel upon the second countershaft. which also
carries another pinion engaging with a spur wheel which is concentric with the
axis of the road wheels, which axis and wheels it drives through the ordinary
differential arrangement admitting of the road wheels on opposite sides of the engine
being driven at different speeds. The wheel and pinion on the second countershaft
may be either on the same or on opposite sides of the engine.
In order that our said Invention may be most fully understood and readily
carried into effect, we will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an elevation and Figure 2 is a plan of a road locomotive provided
with our improved driving gear.
a is the crank shaft, having two pinions of different size, a¹ and a³, fast upon it.
b is the first countershaft, and c is a sleeve loose thereon, but a feather on the one
part engaging with a groove in the other compels the countershaft and sleeve to
rotate together; c and c² are two spur wheels fixed upon the sleeve, and corre-
sponding respectively to the pinions a and a on the crank shaft; d is a fork
embracing a neck formed upon the sleeve, and its stem is received into guides
provided, as is shown, on the cap of the bearing. The fork can be made to slide
the sleeve along the countershaft by means of the hand lever e, and when brought
to the position required it can be bolted by a pin dropped into one or other of
three holes formed in the stem of the fork.

page_text: The countershaft 6 carries outside the horn plate and bracket a pinion which
gears with a spur wheel fl on a second countershaft, or intermediate shaft, or
axis is another pinion revolving with the pinion f¹, it gears with and drives
the ring of teeth g. The ring g is concentric with the axis of the main wheel i, i,
which axis and wheels it drives through the usual differential gear.
Having thus described the nature of our said Invention, and the manner of per-
forming the same, we would have it understood that we claim the arrangement of
the driving gear of road locomotive and similar engines, substantially as herein
described and illustrated by the annexed Drawings.
In witness whereof, I, the said Thomas Aveling, have hereunto, set my hand
and seal, this Thirteenth day of May, in the year of our Lord One thousand
eight hundred and seventy nine.
THOS. AVELING. (L.S.)