IMPROVE- MENTS IN MARINE AND OTHER CONDENSING ENGINES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, JOHN JOSEPH MAY of 53 Holloway Street Exeter in the County of the City
of Exeter, Engineer, do hereby declare the nature of said invention for "IMPROVE-
MENTS IN MARINE AND OTHER CONDENSING ENGINES," to be as follows:-
This invention consists in adapting the air pump of marine and other condensing
engines to act as an auxiliary engine which may be employed to assist in turning
the crank of single cranked engines over the dead points at times of starting or
reversing, or at other times, as desired.
When required so to act, steam or other motive agent is admitted to the air
pump by special valves, or by combined steam and pump valves, and the piston of
the pump is thereby acted upon alternately on one or both sides. Under one
method, the piston rod is connected to the main crank or otherwise in any suitable
manner, the arrangement being such that when the main crank is at or near the
dead centres, the pump piston is in a position to assist it to pass by means of the
pump acting as an auxiliary engine.
The pump cylinder may be also adapted for employment as an assistant motor,
when required, and may be actuated by steam or atmospheric pressure.
Under another arrangement, when the pump is required to be brought into use
as a motor, steam or atmospheric pressure is admitted at one end of the pump to
impel the piston to one end of the stroke, the water and vapour behind the piston
escaping back into the condenser.
The pump piston being now at one end of the stroke, the main crank is at half
stroke and hence in a position to be moved readily on admission of the steam.
W. LLOYD WISE,
Per F. J. Brougham,
Applicant's Agent.

page_text: COMPLETE SPECIFICATION,
I, JOHN JOSEPH MAY of 53 Holloway Street, Exeter in the County of Devon,
Engineer, do hereby declare the nature of my invention for IMPROVEMENTS IN
MARINE & OTHER CONDENSING ENGINES and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:-
This invention which relates to Improvements in Marine & other Condensing
Engines consists in adapting the Air pump to act as an auxiliary Engine in
turning the crank of single cranked Engines over the dead centres at times of
starting or reversing or at other times as desired.
5
At the required times as aforesaid steam or other motive agent is admitted to the 1
pump by suitable valves and the Air pump piston is thereby acted upon alternately
or otherwise on one or both sides.
Under one of several methods the Air pump is arranged horizontally and the
piston is connected by a rod or other suitable means to the crank or a crank disc or
other device so connected as to ensure that when the main crank is at or near the 1
dead centres the pump piston is in a position to assist it to pass by means of the
pump acting as an auxilliary engine.
One arrangement is shown in the accompanying drawing which represents an
engine adapted for Maine purposes-and in which A is the Air pump the pump
rod B being connected by means of the return connecting rod O to a disc D fixed
on crank shaft.
The steam or other motive agent employed to work the pump may be conveyed
by a pipe E and is admitted to the pump by a valve F worked by a rod G actuated
either independently by a hand lever or automatically by a connection with any
suitable moving part of the engine.
The pump cylinder may also be adapted for employment as an auxilliary motor
and may be actuated by steam or other motive agent.
Under another arrangement when the pump is required to be brought into use
steam or other motive agent is admitted to one end of the pump to impel the piston
to the end of the stroke and in this position the main crank is at a suitable part of
the stroke to be started on admission of the steam.
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
The adaptation of the Air pump as an auxilliary motor for carrying the crank
past the centres when starting or reversing and at such times as desired.
" 10th Jan December 1884.