IMPROVEMENTS IN LOCOMOTIVES TRAMWAY AND OTHER ROAD ENGINES
Year: 1884

page_text: I HENRY HARRISON, of Kingston Villa, 44 North Road, Longsight, Manchester,
Lancashire, Mechanical Engineer, do hereby declare the nature of said Invention
for IMPROVEMENTS IN LOCOMOTIVES TRAMWAY AND OTHER ROAD ENGINES, to be
as follows:-
My improvements consist in a novel arrangement of parts for working
locomotives tramway and other road engines on the compound principle.
In carrying my invention into effect I work the locomotive tramway or other
road engine on the compound principle and employ, by preference, two pairs of
cylinders-one high and one low pressure cylinder at each side of the engine.
I make each high pressure cylinder about one third (or more or less) the capacity
of each low pressure cylinder. The two pairs of pistons are connected to separate
cranks at right angles to each other and I arrange that each pair of pistons shall
work simultaneously and together by passing the used steam say from the forward
motion of the smaller or high pressure piston to the backward motion of the larger
or low pressure piston or vice versa, and exhausting from thence into the chimney.
By the use of my Invention there is less strain on the crank axle and unequal
strains on the rods and other working parts are reduced to a minimum, there is
less wear and tear in the working parts generally, at the same time the motion
obtained is more uniform and the energy or power at starting far greater.

page_text: COMPLETE SPECIFICATION
I HENRY HARRISON, of Kingston Villa, 44 North Road, Longsight, Manchester,
Lancashire, Mechanical Engineer, do hereby declare the nature of said Invention
for IMPROVEMENTS IN LOCOMOTIVE, TRAMWAY, AND OTHER ROAD ENGINES, and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:—
My improvements consist in a novel arrangement of parts for working locomotives,
tramway and other road engines on the compound principle.
In carrying my Invention into effect I work the locomotive tramway or other
road engine on the compound principle and employ by preference two pairs of
cylinders one high and one low pressure cylinder-at each side of the engine.
I make each high pressure cylinder about one third (or more or less) the capacity
of each low pressure cylinder. The two pairs of pistons are connected to separate
cranks at right angles to each other and I arrange that each pair of pistons shall
work simultaneously and together by passing the used steam, say from the forward
motion of the smaller or high pressure piston to the backward motion of the larger
or low pressure piston or vice versa and exhausting from thence into the chimney.
By the use of my Invention there is less strain on the crank axle, and unequal
strains on the rods and other working parts are reduced to a minimum, there is
less wear and tear in the working parts generally, at the same time the motion
obtained is more uniform and the energy or power at starting far greater.
And in order that my Invention may be fully understood and readily carried
into effect I will describe the accompanying Sheet of Diagrams which illustrate my
Invention applied to a locomotive engine, reference being had to the figures and
letters marked thereon.
Fig. 1 is a side view, Fig. 2 a plan and Fig. 3 a front view in outline of a
locomotive or tramway engine to which my Invention is applied.
a is the boiler; b the cranked driving shaft; c and d are a pair of compound
cylinders the pistons of which are connected respectively to cranks 6' 62 on the
driving shaft b; c and d are a second pair of compound cylinders the pistons of
which are connected respectively to cranks b³ 6 also on the shaft b.
It will be seen that the piston of the high pressure cylinder c and the piston of
the low pressure cylinder & work simultaneously and together to drive the
cranks bbwhich are set in line with one another; the pistons of the cylinders c¹
and d¹ work similarly together to drive the cranks b³ and b which cranks are also
set in line with one another and at right angles to the cranks b¹ b³.
To start the engine with the cranks in the positions shown in the Drawings,
steam is admitted at the back of the piston in the cylinder c¹ and then into the
cylinder c and when the engine has been sot in motion, the used steam from the
bigh pressure cylinders and c passes through suitable passages into the opposite
ends of their respective low pressure cylinders d¹ and d which exhaust into the
chimney of the locomotive or other engine.
I prefer to use one double ported slide valve to admit steam from each high
pressure to its low pressure cylinder.

page_text: The high pressure cylinders may be placed inside and the low pressure cylinders
outside the frame if more convenient.
I have shown my Invention as applied to a locomotive engine, it is however,
equally applicable to other road engines.
A single pair of compound cylinders may be applied to traction or other road
engines in which a single cylinder is now used, in such cases I connect the piston
of each cylinder to cranks on the same shaft and set in the same line so that both
pistons move simultaneously and together.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, I declare that what
I claim is
1. In locomotives, tramway and other road engines, the use and application of
two pairs of compound cylinders, arranged substantially in the manner herein set
forth.
2. The use and application of a single pair of compound cylinders for working
traction or other road engines, substantially in the manner described.
Dated this 21st day of July 1885.
H. B. BARLOW,
Agent for Applicant,
17, St. Ann's Square, Manchester.
H. B. BARLOW,
Agent for Applicant,
17, St. Ann's Square, Manchester.