Steam Engines.
Year: 1887

page_text: Date of Application, 6th May, 1887.
Complete Left, 20th May, 1887.
Complete Accepted. 21st June, 1887.
Steam Engines.
I, LEONARD JENNETT TODD, of 25 Brooke Road, Stoke Newington, in the County
of Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
The double-acting cylinders to which this invention refers are of that type which
has a separate inlet at each extreme end, and a common outlet in the center controlled
by the main piston itself.
The steam valves used are all non-exhausting, of the vibrating, oscillating, or rotary
type, transversely arranged; and by preference controlled by the action of a suitable
govenor.
A single one of such valves may be placed in the center of the length of the
cylinder so as to control both inlets. Or one of such valves may be used to control
each inlet separately, and in a horizontal cylinder may most advantageously be placed
on the under side at each outer end.
And thus a steam engine cylinder produced possessing great thermodynamic
advantages over the ordinary "Corliss" or "Wheelock" engine, and yet at the same
time a cylinder which only requires one or at the most two steam valves, in place of
the usual four steam valves of these engines.

page_text: the by valves V1. Certain ouvi-acting
Steam Engines.
I, LEONARD JENNETT TODD, of 25 Brooke Road, Stoke Newington, in the County
of Middlesex, 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:-
:-
The double-acting cylinders to which this invention refers are of that type which
has a separate inlet at each extreme end, and a common outlet in the center controlled
by the main piston itself.
Cylinders of this type have a greater thermodynamic efficiency than ordinary
cylinders, on account of their inlet ends not being cooled as much as usual by the cold
waste steam.
The steam valves used are all non-exhausting, of the vibrating, oscillating, or rotary
type, transversely arranged; and by preference controlled by the action of a suitable
govenor.
Govenor-controlled valves of the type described are the most efficient known, and
cylinders of the type described are the most efficient known: and the combination of
these valves and these cylinders produces a new and improved and useful effect not
previously attained.
A single valve of the type described may be placed in the center of the length
of a cylinder of the type described, so as to control both inlets. Such a valve and
such a cylinder are shown on the accompanying Drawing No. 1.
And the oscillating
non-exhausting govenor-controlled valve thereon shown to control both inlets,
and the cylinder of the type described, form a new and improved and useful
combination.
Or a single valve of the type described may be used to control each inlet separately,
and in a horizontal cylinder inay most advantageously be placed on the under side at
each outer end. Such an arrangement of valves and of a horizontal cylinder of the
type described, is shown on the accompanying Drawing No. 2. In ordinary
horizontal cylinders which have previously had transverse oscillating inlet valves
placed on the under side near each outer end, as in the "Wheelock-Corliss" engine,
such valves have of necessity been placed in a disadvantageous position owing to the
presence of the ordinary additional outlet valve. But by using a cylinder of the type
described ordinary outlet valves are not required, and therefore the inlet valves on
these horizontal cylinders can be placed in a new and improved and more useful
position than has hitherto been possible.
And thus a steam engine cylinder is produced possessing great thermodynamic
advantages over the ordinary "Corliss" or "Wheelock" engine, and yet at the

page_text: same time a cylinder which only requires one or at the most two steam valves, in place
of the usual four steam valves of these engines.
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. A double-acting steam engine cylinder of the type described having a
non-exhausting govenor-controlled oscillating valve controlling both inlets, as
described.
2. A double-acting horizontal steam engine cylinder of the type described having a
steam passage on the under side of each outer end communicating with an inlet valve
only, as described.
3. A double-acting steam engine cylinder of the type described having an arrange-
ment of a non-exhausting govenor-controlled oscillating inlet valve or valves,
substantially as described or illustrated.
4. A double-acting steam engine cylinder of the type described and its related valve
or valves, substantially as described or illustrated.
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